Adding upstream version 1.5.2.upstream/1.5.2upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

77 files changed, 14941 insertions, 0 deletions

diff --git a/libpam/Makefile.am b/libpam/Makefile.am
new file mode 100644
index 0000000..55222af
--- /dev/null
+++ b/libpam/Makefile.am
@@ -0,0 +1,46 @@
+#
+# Copyright (c) 2005, 2006, 2007, 2009 Thorsten Kukuk <kukuk@thkukuk.de>
+#
+
+AM_CFLAGS = -DDEFAULT_MODULE_PATH=\"$(SECUREDIR)/\" -DLIBPAM_COMPILE \
+	-I$(srcdir)/include $(LIBPRELUDE_CFLAGS) $(ECONF_CFLAGS) \
+	-DPAM_VERSION=\"$(VERSION)\" -DSYSCONFDIR=\"$(sysconfdir)\" \
+	$(WARN_CFLAGS)
+
+CLEANFILES = *~
+
+EXTRA_DIST = libpam.map
+
+include_HEADERS = include/security/_pam_compat.h \
+	include/security/_pam_macros.h include/security/_pam_types.h \
+	include/security/pam_appl.h include/security/pam_modules.h \
+	include/security/pam_ext.h include/security/pam_modutil.h
+
+noinst_HEADERS = pam_prelude.h pam_private.h pam_tokens.h \
+		pam_modutil_private.h include/pam_cc_compat.h \
+		include/pam_inline.h include/test_assert.h
+
+libpam_la_LDFLAGS = -no-undefined -version-info 85:1:85
+libpam_la_LIBADD = @LIBAUDIT@ $(LIBPRELUDE_LIBS) $(ECONF_LIBS) @LIBDL@
+
+if HAVE_VERSIONING
+  libpam_la_LDFLAGS += -Wl,--version-script=$(srcdir)/libpam.map
+endif
+
+lib_LTLIBRARIES = libpam.la
+
+libpam_la_SOURCES = pam_account.c pam_auth.c pam_data.c pam_delay.c \
+	pam_dispatch.c pam_end.c pam_env.c pam_get_authtok.c \
+	pam_handlers.c pam_item.c \
+	pam_misc.c pam_password.c pam_prelude.c \
+	pam_session.c pam_start.c pam_strerror.c \
+	pam_vprompt.c pam_syslog.c pam_dynamic.c pam_audit.c \
+	pam_modutil_check_user.c \
+	pam_modutil_cleanup.c pam_modutil_getpwnam.c pam_modutil_ioloop.c \
+	pam_modutil_getgrgid.c pam_modutil_getpwuid.c pam_modutil_getgrnam.c \
+	pam_modutil_getspnam.c pam_modutil_getlogin.c pam_modutil_ingroup.c \
+	pam_modutil_priv.c pam_modutil_sanitize.c pam_modutil_searchkey.c
+
+# Pkg-config script.
+pkgconfigdir = $(libdir)/pkgconfig
+pkgconfig_DATA = pam.pc
diff --git a/libpam/Makefile.in b/libpam/Makefile.in
new file mode 100644
index 0000000..0c2333c
--- /dev/null
+++ b/libpam/Makefile.in
@@ -0,0 +1,953 @@
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+infodir = @infodir@
+install_sh = @install_sh@
+libdir = @libdir@
+libexecdir = @libexecdir@
+localedir = @localedir@
+localstatedir = @localstatedir@
+mandir = @mandir@
+mkdir_p = @mkdir_p@
+oldincludedir = @oldincludedir@
+pam_xauth_path = @pam_xauth_path@
+pdfdir = @pdfdir@
+prefix = @prefix@
+program_transform_name = @program_transform_name@
+psdir = @psdir@
+sbindir = @sbindir@
+sharedstatedir = @sharedstatedir@
+srcdir = @srcdir@
+sysconfdir = @sysconfdir@
+systemdunitdir = @systemdunitdir@
+target_alias = @target_alias@
+top_build_prefix = @top_build_prefix@
+top_builddir = @top_builddir@
+top_srcdir = @top_srcdir@
+AM_CFLAGS = -DDEFAULT_MODULE_PATH=\"$(SECUREDIR)/\" -DLIBPAM_COMPILE \
+	-I$(srcdir)/include $(LIBPRELUDE_CFLAGS) $(ECONF_CFLAGS) \
+	-DPAM_VERSION=\"$(VERSION)\" -DSYSCONFDIR=\"$(sysconfdir)\" \
+	$(WARN_CFLAGS)
+
+CLEANFILES = *~
+EXTRA_DIST = libpam.map
+include_HEADERS = include/security/_pam_compat.h \
+	include/security/_pam_macros.h include/security/_pam_types.h \
+	include/security/pam_appl.h include/security/pam_modules.h \
+	include/security/pam_ext.h include/security/pam_modutil.h
+
+noinst_HEADERS = pam_prelude.h pam_private.h pam_tokens.h \
+		pam_modutil_private.h include/pam_cc_compat.h \
+		include/pam_inline.h include/test_assert.h
+
+libpam_la_LDFLAGS = -no-undefined -version-info 85:1:85 \
+	$(am__append_1)
+libpam_la_LIBADD = @LIBAUDIT@ $(LIBPRELUDE_LIBS) $(ECONF_LIBS) @LIBDL@
+lib_LTLIBRARIES = libpam.la
+libpam_la_SOURCES = pam_account.c pam_auth.c pam_data.c pam_delay.c \
+	pam_dispatch.c pam_end.c pam_env.c pam_get_authtok.c \
+	pam_handlers.c pam_item.c \
+	pam_misc.c pam_password.c pam_prelude.c \
+	pam_session.c pam_start.c pam_strerror.c \
+	pam_vprompt.c pam_syslog.c pam_dynamic.c pam_audit.c \
+	pam_modutil_check_user.c \
+	pam_modutil_cleanup.c pam_modutil_getpwnam.c pam_modutil_ioloop.c \
+	pam_modutil_getgrgid.c pam_modutil_getpwuid.c pam_modutil_getgrnam.c \
+	pam_modutil_getspnam.c pam_modutil_getlogin.c pam_modutil_ingroup.c \
+	pam_modutil_priv.c pam_modutil_sanitize.c pam_modutil_searchkey.c
+
+
+# Pkg-config script.
+pkgconfigdir = $(libdir)/pkgconfig
+pkgconfig_DATA = pam.pc
+all: all-am
+
+.SUFFIXES:
+.SUFFIXES: .c .lo .o .obj
+$(srcdir)/Makefile.in:  $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --gnu libpam/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --gnu libpam/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure:  $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4):  $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+pam.pc: $(top_builddir)/config.status $(srcdir)/pam.pc.in
+	cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@
+
+install-libLTLIBRARIES: $(lib_LTLIBRARIES)
+	@$(NORMAL_INSTALL)
+	@list='$(lib_LTLIBRARIES)'; test -n "$(libdir)" || list=; \
+	list2=; for p in $$list; do \
+	  if test -f $$p; then \
+	    list2="$$list2 $$p"; \
+	  else :; fi; \
+	done; \
+	test -z "$$list2" || { \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(libdir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(libdir)" || exit 1; \
+	  echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL) $(INSTALL_STRIP_FLAG) $$list2 '$(DESTDIR)$(libdir)'"; \
+	  $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL) $(INSTALL_STRIP_FLAG) $$list2 "$(DESTDIR)$(libdir)"; \
+	}
+
+uninstall-libLTLIBRARIES:
+	@$(NORMAL_UNINSTALL)
+	@list='$(lib_LTLIBRARIES)'; test -n "$(libdir)" || list=; \
+	for p in $$list; do \
+	  $(am__strip_dir) \
+	  echo " $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f '$(DESTDIR)$(libdir)/$$f'"; \
+	  $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=uninstall rm -f "$(DESTDIR)$(libdir)/$$f"; \
+	done
+
+clean-libLTLIBRARIES:
+	-test -z "$(lib_LTLIBRARIES)" || rm -f $(lib_LTLIBRARIES)
+	@list='$(lib_LTLIBRARIES)'; \
+	locs=`for p in $$list; do echo $$p; done | \
+	      sed 's|^[^/]*$$|.|; s|/[^/]*$$||; s|$$|/so_locations|' | \
+	      sort -u`; \
+	test -z "$$locs" || { \
+	  echo rm -f $${locs}; \
+	  rm -f $${locs}; \
+	}
+
+libpam.la: $(libpam_la_OBJECTS) $(libpam_la_DEPENDENCIES) $(EXTRA_libpam_la_DEPENDENCIES) 
+	$(AM_V_CCLD)$(libpam_la_LINK) -rpath $(libdir) $(libpam_la_OBJECTS) $(libpam_la_LIBADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_account.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_audit.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_auth.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_data.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_delay.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_dispatch.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_dynamic.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_end.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_env.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_get_authtok.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_handlers.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_item.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_misc.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_modutil_check_user.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_modutil_cleanup.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_modutil_getgrgid.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_modutil_getgrnam.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_modutil_getlogin.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_modutil_getpwnam.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_modutil_getpwuid.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_modutil_getspnam.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_modutil_ingroup.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_modutil_ioloop.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_modutil_priv.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_modutil_sanitize.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_modutil_searchkey.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_password.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_prelude.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_session.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_start.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_strerror.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_syslog.Plo@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/pam_vprompt.Plo@am__quote@ # am--include-marker
+
+$(am__depfiles_remade):
+	@$(MKDIR_P) $(@D)
+	@echo '# dummy' >$@-t && $(am__mv) $@-t $@
+
+am--depfiles: $(am__depfiles_remade)
+
+.c.o:
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
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+
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+.c.lo:
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+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(LTCOMPILE) -c -o $@ $<
+
+mostlyclean-libtool:
+	-rm -f *.lo
+
+clean-libtool:
+	-rm -rf .libs _libs
+install-pkgconfigDATA: $(pkgconfig_DATA)
+	@$(NORMAL_INSTALL)
+	@list='$(pkgconfig_DATA)'; test -n "$(pkgconfigdir)" || list=; \
+	if test -n "$$list"; then \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(pkgconfigdir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(pkgconfigdir)" || exit 1; \
+	fi; \
+	for p in $$list; do \
+	  if test -f "$$p"; then d=; else d="$(srcdir)/"; fi; \
+	  echo "$$d$$p"; \
+	done | $(am__base_list) | \
+	while read files; do \
+	  echo " $(INSTALL_DATA) $$files '$(DESTDIR)$(pkgconfigdir)'"; \
+	  $(INSTALL_DATA) $$files "$(DESTDIR)$(pkgconfigdir)" || exit $$?; \
+	done
+
+uninstall-pkgconfigDATA:
+	@$(NORMAL_UNINSTALL)
+	@list='$(pkgconfig_DATA)'; test -n "$(pkgconfigdir)" || list=; \
+	files=`for p in $$list; do echo $$p; done | sed -e 's|^.*/||'`; \
+	dir='$(DESTDIR)$(pkgconfigdir)'; $(am__uninstall_files_from_dir)
+install-includeHEADERS: $(include_HEADERS)
+	@$(NORMAL_INSTALL)
+	@list='$(include_HEADERS)'; test -n "$(includedir)" || list=; \
+	if test -n "$$list"; then \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(includedir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(includedir)" || exit 1; \
+	fi; \
+	for p in $$list; do \
+	  if test -f "$$p"; then d=; else d="$(srcdir)/"; fi; \
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+	done | $(am__base_list) | \
+	while read files; do \
+	  echo " $(INSTALL_HEADER) $$files '$(DESTDIR)$(includedir)'"; \
+	  $(INSTALL_HEADER) $$files "$(DESTDIR)$(includedir)" || exit $$?; \
+	done
+
+uninstall-includeHEADERS:
+	@$(NORMAL_UNINSTALL)
+	@list='$(include_HEADERS)'; test -n "$(includedir)" || list=; \
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+	$(am__define_uniq_tagged_files); \
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+	  if test $$# -gt 0; then \
+	    $(ETAGS) $(ETAGSFLAGS) $(AM_ETAGSFLAGS) $(ETAGS_ARGS) \
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+	     $$unique
+
+GTAGS:
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+	for i in $$list; do \
+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
+	done >> $(top_builddir)/cscope.files
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+	list='$(DISTFILES)'; \
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+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
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+	esac; \
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+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
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+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
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+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+check: check-am
+all-am: Makefile $(LTLIBRARIES) $(DATA) $(HEADERS)
+installdirs:
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+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
+install: install-am
+install-exec: install-exec-am
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+install-am: all-am
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+installcheck: installcheck-am
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
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+maintainer-clean-generic:
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+clean: clean-am
+
+clean-am: clean-generic clean-libLTLIBRARIES clean-libtool \
+	mostlyclean-am
+
+distclean: distclean-am
+		-rm -f ./$(DEPDIR)/pam_account.Plo
+	-rm -f ./$(DEPDIR)/pam_audit.Plo
+	-rm -f ./$(DEPDIR)/pam_auth.Plo
+	-rm -f ./$(DEPDIR)/pam_data.Plo
+	-rm -f ./$(DEPDIR)/pam_delay.Plo
+	-rm -f ./$(DEPDIR)/pam_dispatch.Plo
+	-rm -f ./$(DEPDIR)/pam_dynamic.Plo
+	-rm -f ./$(DEPDIR)/pam_end.Plo
+	-rm -f ./$(DEPDIR)/pam_env.Plo
+	-rm -f ./$(DEPDIR)/pam_get_authtok.Plo
+	-rm -f ./$(DEPDIR)/pam_handlers.Plo
+	-rm -f ./$(DEPDIR)/pam_item.Plo
+	-rm -f ./$(DEPDIR)/pam_misc.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_check_user.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_cleanup.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_getgrgid.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_getgrnam.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_getlogin.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_getpwnam.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_getpwuid.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_getspnam.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_ingroup.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_ioloop.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_priv.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_sanitize.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_searchkey.Plo
+	-rm -f ./$(DEPDIR)/pam_password.Plo
+	-rm -f ./$(DEPDIR)/pam_prelude.Plo
+	-rm -f ./$(DEPDIR)/pam_session.Plo
+	-rm -f ./$(DEPDIR)/pam_start.Plo
+	-rm -f ./$(DEPDIR)/pam_strerror.Plo
+	-rm -f ./$(DEPDIR)/pam_syslog.Plo
+	-rm -f ./$(DEPDIR)/pam_vprompt.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am: install-includeHEADERS install-pkgconfigDATA
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am: install-libLTLIBRARIES
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+		-rm -f ./$(DEPDIR)/pam_account.Plo
+	-rm -f ./$(DEPDIR)/pam_audit.Plo
+	-rm -f ./$(DEPDIR)/pam_auth.Plo
+	-rm -f ./$(DEPDIR)/pam_data.Plo
+	-rm -f ./$(DEPDIR)/pam_delay.Plo
+	-rm -f ./$(DEPDIR)/pam_dispatch.Plo
+	-rm -f ./$(DEPDIR)/pam_dynamic.Plo
+	-rm -f ./$(DEPDIR)/pam_end.Plo
+	-rm -f ./$(DEPDIR)/pam_env.Plo
+	-rm -f ./$(DEPDIR)/pam_get_authtok.Plo
+	-rm -f ./$(DEPDIR)/pam_handlers.Plo
+	-rm -f ./$(DEPDIR)/pam_item.Plo
+	-rm -f ./$(DEPDIR)/pam_misc.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_check_user.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_cleanup.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_getgrgid.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_getgrnam.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_getlogin.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_getpwnam.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_getpwuid.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_getspnam.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_ingroup.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_ioloop.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_priv.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_sanitize.Plo
+	-rm -f ./$(DEPDIR)/pam_modutil_searchkey.Plo
+	-rm -f ./$(DEPDIR)/pam_password.Plo
+	-rm -f ./$(DEPDIR)/pam_prelude.Plo
+	-rm -f ./$(DEPDIR)/pam_session.Plo
+	-rm -f ./$(DEPDIR)/pam_start.Plo
+	-rm -f ./$(DEPDIR)/pam_strerror.Plo
+	-rm -f ./$(DEPDIR)/pam_syslog.Plo
+	-rm -f ./$(DEPDIR)/pam_vprompt.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am: uninstall-includeHEADERS uninstall-libLTLIBRARIES \
+	uninstall-pkgconfigDATA
+
+.MAKE: install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-am clean \
+	clean-generic clean-libLTLIBRARIES clean-libtool cscopelist-am \
+	ctags ctags-am distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am \
+	install-includeHEADERS install-info install-info-am \
+	install-libLTLIBRARIES install-man install-pdf install-pdf-am \
+	install-pkgconfigDATA install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs maintainer-clean \
+	maintainer-clean-generic mostlyclean mostlyclean-compile \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am uninstall-includeHEADERS \
+	uninstall-libLTLIBRARIES uninstall-pkgconfigDATA
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/libpam/include/pam_cc_compat.h b/libpam/include/pam_cc_compat.h
new file mode 100644
index 0000000..6919036
--- /dev/null
+++ b/libpam/include/pam_cc_compat.h
@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2020 Dmitry V. Levin <ldv@altlinux.org>
+ */
+
+#ifndef PAM_CC_COMPAT_H
+#define PAM_CC_COMPAT_H
+
+#include "config.h"
+#include <security/_pam_types.h>
+
+#if defined __clang__ && defined __clang_major__ && defined __clang_minor__
+# define PAM_CLANG_PREREQ(maj, min)					\
+	((__clang_major__ << 16) + __clang_minor__ >= ((maj) << 16) + (min))
+#else
+# define PAM_CLANG_PREREQ(maj, min)	0
+#endif
+
+#if PAM_GNUC_PREREQ(2, 7)
+# define PAM_ATTRIBUTE_ALIGNED(arg)	__attribute__((__aligned__(arg)))
+#else
+# define PAM_ATTRIBUTE_ALIGNED(arg)	/* empty */
+#endif
+
+#if PAM_GNUC_PREREQ(4, 6)
+# define DIAG_PUSH_IGNORE_CAST_QUAL					\
+	_Pragma("GCC diagnostic push");					\
+	_Pragma("GCC diagnostic ignored \"-Wcast-qual\"")
+# define DIAG_POP_IGNORE_CAST_QUAL					\
+	_Pragma("GCC diagnostic pop")
+# define DIAG_PUSH_IGNORE_CAST_ALIGN					\
+	_Pragma("GCC diagnostic push");					\
+	_Pragma("GCC diagnostic ignored \"-Wcast-align\"")
+# define DIAG_POP_IGNORE_CAST_ALIGN					\
+	_Pragma("GCC diagnostic pop")
+#elif PAM_CLANG_PREREQ(2, 6)
+# define DIAG_PUSH_IGNORE_CAST_QUAL					\
+	_Pragma("clang diagnostic push");				\
+	_Pragma("clang diagnostic ignored \"-Wcast-qual\"")
+# define DIAG_POP_IGNORE_CAST_QUAL					\
+	_Pragma("clang diagnostic pop")
+# define DIAG_PUSH_IGNORE_CAST_ALIGN					\
+	_Pragma("clang diagnostic push");				\
+	_Pragma("clang diagnostic ignored \"-Wcast-align\"")
+# define DIAG_POP_IGNORE_CAST_ALIGN					\
+	_Pragma("clang diagnostic pop")
+#else
+# define DIAG_PUSH_IGNORE_CAST_QUAL	/* empty */
+# define DIAG_POP_IGNORE_CAST_QUAL	/* empty */
+# define DIAG_PUSH_IGNORE_CAST_ALIGN	/* empty */
+# define DIAG_POP_IGNORE_CAST_ALIGN	/* empty */
+#endif
+
+/*
+ * Evaluates to
+ * 1, if the given two types are known to be the same
+ * 0, otherwise.
+ */
+#if PAM_GNUC_PREREQ(3, 0)
+# define PAM_IS_SAME_TYPE(x_, y_)					\
+	__builtin_types_compatible_p(__typeof__(x_), __typeof__(y_))
+#else
+/* Cannot tell whether these types are the same.  */
+# define PAM_IS_SAME_TYPE(x_, y_)	0
+#endif
+
+#endif /* PAM_CC_COMPAT_H */
diff --git a/libpam/include/pam_inline.h b/libpam/include/pam_inline.h
new file mode 100644
index 0000000..ec2f3bf
--- /dev/null
+++ b/libpam/include/pam_inline.h
@@ -0,0 +1,118 @@
+/*
+ * Copyright (c) 2020 Dmitry V. Levin <ldv@altlinux.org>
+ *
+ * Handy inline functions and macros providing some convenient functionality
+ * to libpam and its modules.
+ */
+
+#ifndef PAM_INLINE_H
+#define PAM_INLINE_H
+
+#include "pam_cc_compat.h"
+#include <string.h>
+#include <unistd.h>
+#include <errno.h>
+
+/*
+ * Evaluates to
+ * - a syntax error if the argument is 0,
+ * 0, otherwise.
+ */
+#define PAM_FAIL_BUILD_ON_ZERO(e_)	(sizeof(int[-1 + 2 * !!(e_)]) * 0)
+
+/*
+ * Evaluates to
+ * 1, if the given type is known to be a non-array type
+ * 0, otherwise.
+ */
+#define PAM_IS_NOT_ARRAY(a_)		PAM_IS_SAME_TYPE((a_), &(a_)[0])
+
+/*
+ * Evaluates to
+ * - a syntax error if the argument is not an array,
+ * 0, otherwise.
+ */
+#define PAM_MUST_BE_ARRAY(a_)		PAM_FAIL_BUILD_ON_ZERO(!PAM_IS_NOT_ARRAY(a_))
+
+/* Evaluates to the number of elements in the specified array.  */
+#define PAM_ARRAY_SIZE(a_)		(sizeof(a_) / sizeof((a_)[0]) + PAM_MUST_BE_ARRAY(a_))
+
+/*
+ * Returns NULL if STR does not start with PREFIX,
+ * or a pointer to the first char in STR after PREFIX.
+ * The length of PREFIX is specified by PREFIX_LEN.
+ */
+static inline const char *
+pam_str_skip_prefix_len(const char *str, const char *prefix, size_t prefix_len)
+{
+	return strncmp(str, prefix, prefix_len) ? NULL : str + prefix_len;
+}
+
+#define pam_str_skip_prefix(str_, prefix_)	\
+	pam_str_skip_prefix_len((str_), (prefix_), sizeof(prefix_) - 1 + PAM_MUST_BE_ARRAY(prefix_))
+
+/*
+ * Returns NULL if STR does not start with PREFIX
+ * (ignoring the case of the characters),
+ * or a pointer to the first char in STR after PREFIX.
+ * The length of PREFIX is specified by PREFIX_LEN.
+ */
+static inline const char *
+pam_str_skip_icase_prefix_len(const char *str, const char *prefix, size_t prefix_len)
+{
+	return strncasecmp(str, prefix, prefix_len) ? NULL : str + prefix_len;
+}
+
+#define pam_str_skip_icase_prefix(str_, prefix_)	\
+	pam_str_skip_icase_prefix_len((str_), (prefix_), sizeof(prefix_) - 1 + PAM_MUST_BE_ARRAY(prefix_))
+
+static inline int
+pam_read_passwords(int fd, int npass, char **passwords)
+{
+	/*
+	 * The passwords array must contain npass preallocated
+	 * buffers of length PAM_MAX_RESP_SIZE + 1.
+	 */
+	int rbytes = 0;
+	int offset = 0;
+	int i = 0;
+	char *pptr;
+	while (npass > 0) {
+		rbytes = read(fd, passwords[i]+offset, PAM_MAX_RESP_SIZE+1-offset);
+
+		if (rbytes < 0) {
+			if (errno == EINTR) {
+				continue;
+			}
+			break;
+		}
+		if (rbytes == 0) {
+			break;
+		}
+
+		while (npass > 0 &&
+		       (pptr = memchr(passwords[i] + offset, '\0', rbytes)) != NULL) {
+			++pptr; /* skip the '\0' */
+			rbytes -= pptr - (passwords[i] + offset);
+			i++;
+			offset = 0;
+			npass--;
+			if (rbytes > 0) {
+				if (npass > 0) {
+					memcpy(passwords[i], pptr, rbytes);
+				}
+				memset(pptr, '\0', rbytes);
+			}
+		}
+		offset += rbytes;
+	}
+
+	/* clear up */
+	if (offset > 0 && npass > 0) {
+		memset(passwords[i], '\0', offset);
+	}
+
+	return i;
+}
+
+#endif /* PAM_INLINE_H */
diff --git a/libpam/include/security/_pam_compat.h b/libpam/include/security/_pam_compat.h
new file mode 100644
index 0000000..a5f58e4
--- /dev/null
+++ b/libpam/include/security/_pam_compat.h
@@ -0,0 +1,126 @@
+#ifndef _PAM_COMPAT_H
+#define _PAM_COMPAT_H
+
+/*
+ * This file was contributed by Derrick J Brashear <shadow@dementia.org>
+ * slight modification by Brad M. Garcia <bgarcia@fore.com>
+ *
+ * A number of operating systems have started to implement PAM.
+ * unfortunately, they have a different set of numeric values for
+ * certain constants.  This file is included for compatibility's sake.
+ */
+
+/* Solaris uses different constants. We redefine to those here */
+#if defined(solaris) || (defined(__SVR4) && defined(sun))
+
+# ifdef _SECURITY_PAM_MODULES_H
+
+/* flags for pam_chauthtok() */
+#  undef PAM_PRELIM_CHECK
+#  define PAM_PRELIM_CHECK        	0x1
+
+#  undef PAM_UPDATE_AUTHTOK
+#  define PAM_UPDATE_AUTHTOK      	0x2
+
+# endif /* _SECURITY_PAM_MODULES_H */
+
+# ifdef _SECURITY__PAM_TYPES_H
+
+/* generic for pam_* functions */
+# undef PAM_SILENT
+# define PAM_SILENT              	0x80000000
+
+# undef PAM_CHANGE_EXPIRED_AUTHTOK
+# define PAM_CHANGE_EXPIRED_AUTHTOK 	0x4
+
+/* flags for pam_setcred() */
+# undef PAM_ESTABLISH_CRED
+# define PAM_ESTABLISH_CRED      	0x1
+
+# undef PAM_DELETE_CRED
+# define PAM_DELETE_CRED         	0x2
+
+# undef PAM_REINITIALIZE_CRED
+# define PAM_REINITIALIZE_CRED   	0x4
+
+# undef PAM_REFRESH_CRED
+# define PAM_REFRESH_CRED        	0x8
+
+/* another binary incompatibility comes from the return codes! */
+
+# undef PAM_CONV_ERR
+# define PAM_CONV_ERR            	6
+
+# undef PAM_PERM_DENIED
+# define PAM_PERM_DENIED         	7
+
+# undef PAM_MAXTRIES
+# define PAM_MAXTRIES            	8
+
+# undef PAM_AUTH_ERR
+# define PAM_AUTH_ERR            	9
+
+# undef PAM_NEW_AUTHTOK_REQD
+# define PAM_NEW_AUTHTOK_REQD    	10
+
+# undef PAM_CRED_INSUFFICIENT
+# define PAM_CRED_INSUFFICIENT   	11
+
+# undef PAM_AUTHINFO_UNAVAIL
+# define PAM_AUTHINFO_UNAVAIL    	12
+
+# undef PAM_USER_UNKNOWN
+# define PAM_USER_UNKNOWN        	13
+
+# undef PAM_CRED_UNAVAIL
+# define PAM_CRED_UNAVAIL        	14
+
+# undef PAM_CRED_EXPIRED
+# define PAM_CRED_EXPIRED        	15
+
+# undef PAM_CRED_ERR
+# define PAM_CRED_ERR            	16
+
+# undef PAM_ACCT_EXPIRED
+# define PAM_ACCT_EXPIRED        	17
+
+# undef PAM_AUTHTOK_EXPIRED
+# define PAM_AUTHTOK_EXPIRED     	18
+
+# undef PAM_SESSION_ERR
+# define PAM_SESSION_ERR         	19
+
+# undef PAM_AUTHTOK_ERR
+# define PAM_AUTHTOK_ERR           	20
+
+# undef PAM_AUTHTOK_RECOVERY_ERR
+# define PAM_AUTHTOK_RECOVERY_ERR  	21
+
+# undef PAM_AUTHTOK_LOCK_BUSY
+# define PAM_AUTHTOK_LOCK_BUSY     	22
+
+# undef PAM_AUTHTOK_DISABLE_AGING
+# define PAM_AUTHTOK_DISABLE_AGING 	23
+
+# undef PAM_NO_MODULE_DATA
+# define PAM_NO_MODULE_DATA      	24
+
+# undef PAM_IGNORE
+# define PAM_IGNORE              	25
+
+# undef PAM_ABORT
+# define PAM_ABORT               	26
+
+# undef PAM_TRY_AGAIN
+# define PAM_TRY_AGAIN           	27
+
+#endif /* _SECURITY__PAM_TYPES_H */
+
+#else
+
+/* For compatibility with old Linux-PAM implementations. */
+#define PAM_AUTHTOK_RECOVER_ERR PAM_AUTHTOK_RECOVERY_ERR
+
+#endif /* defined(solaris) || (defined(__SVR4) && defined(sun)) */
+
+#endif /* _PAM_COMPAT_H */
diff --git a/libpam/include/security/_pam_macros.h b/libpam/include/security/_pam_macros.h
new file mode 100644
index 0000000..e891e22
--- /dev/null
+++ b/libpam/include/security/_pam_macros.h
@@ -0,0 +1,196 @@
+#ifndef PAM_MACROS_H
+#define PAM_MACROS_H
+
+/*
+ * All kind of macros used by PAM, but usable in some other
+ * programs too.
+ * Organized by Cristian Gafton <gafton@redhat.com>
+ */
+
+/* a 'safe' version of strdup */
+
+#include <stdlib.h>
+#include <string.h>
+
+#define  x_strdup(s)  ( (s) ? strdup(s):NULL )
+
+/* Good policy to strike out passwords with some characters not just
+   free the memory */
+
+#define _pam_overwrite(x)        \
+do {                             \
+     register char *__xx__;      \
+     if ((__xx__=(x)))           \
+          while (*__xx__)        \
+               *__xx__++ = '\0'; \
+} while (0)
+
+#define _pam_overwrite_n(x,n)   \
+do {                             \
+     register char *__xx__;      \
+     register unsigned int __i__ = 0;    \
+     if ((__xx__=(x)))           \
+        for (;__i__<n; __i__++) \
+            __xx__[__i__] = 0; \
+} while (0)
+
+/*
+ * Don't just free it, forget it too.
+ */
+
+#define _pam_drop(X) \
+do {                 \
+    if (X) {         \
+        free(X);     \
+        X=NULL;      \
+    }                \
+} while (0)
+
+#define _pam_drop_reply(/* struct pam_response * */ reply, /* int */ replies) \
+do {                                              \
+    int reply_i;                                  \
+                                                  \
+    for (reply_i=0; reply_i<replies; ++reply_i) { \
+	if (reply[reply_i].resp) {                \
+	    _pam_overwrite(reply[reply_i].resp);  \
+	    free(reply[reply_i].resp);            \
+	}                                         \
+    }                                             \
+    if (reply)                                    \
+	free(reply);                              \
+} while (0)
+
+/* some debugging code */
+
+#ifdef PAM_DEBUG
+
+/*
+ * This provides the necessary function to do debugging in PAM.
+ * Cristian Gafton <gafton@redhat.com>
+ */
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <stdarg.h>
+#include <errno.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+/*
+ * This is for debugging purposes ONLY. DO NOT use on live systems !!!
+ * You have been warned :-) - CG
+ *
+ * to get automated debugging to the log file, it must be created manually.
+ * _PAM_LOGFILE must exist and be writable to the programs you debug.
+ */
+
+#ifndef _PAM_LOGFILE
+#define _PAM_LOGFILE "/var/run/pam-debug.log"
+#endif
+
+static void _pam_output_debug_info(const char *file, const char *fn
+				   , const int line)
+{
+    FILE *logfile;
+    int must_close = 1, fd;
+
+#ifdef O_NOFOLLOW
+    if ((fd = open(_PAM_LOGFILE, O_WRONLY|O_NOFOLLOW|O_APPEND)) != -1) {
+#else
+    if ((fd = open(_PAM_LOGFILE, O_WRONLY|O_APPEND)) != -1) {
+#endif
+	if (!(logfile = fdopen(fd,"a"))) {
+	    logfile = stderr;
+	    must_close = 0;
+	    close(fd);
+	}
+    } else {
+        logfile = stderr;
+	must_close = 0;
+    }
+    fprintf(logfile,"[%s:%s(%d)] ",file, fn, line);
+    fflush(logfile);
+    if (must_close)
+        fclose(logfile);
+}
+
+static void _pam_output_debug(const char *format, ...)
+{
+    va_list args;
+    FILE *logfile;
+    int must_close = 1, fd;
+
+    va_start(args, format);
+
+#ifdef O_NOFOLLOW
+    if ((fd = open(_PAM_LOGFILE, O_WRONLY|O_NOFOLLOW|O_APPEND)) != -1) {
+#else
+    if ((fd = open(_PAM_LOGFILE, O_WRONLY|O_APPEND)) != -1) {
+#endif
+	if (!(logfile = fdopen(fd,"a"))) {
+	    logfile = stderr;
+	    must_close = 0;
+	    close(fd);
+	}
+    } else {
+	logfile = stderr;
+	must_close = 0;
+    }
+    vfprintf(logfile, format, args);
+    fprintf(logfile, "\n");
+    fflush(logfile);
+    if (must_close)
+        fclose(logfile);
+
+    va_end(args);
+}
+
+#define D(x) do { \
+    _pam_output_debug_info(__FILE__, __FUNCTION__, __LINE__); \
+    _pam_output_debug x ; \
+} while (0)
+
+#define _pam_show_mem(X,XS) do {                                      \
+      int i;                                                          \
+      register unsigned char *x;                                      \
+      x = (unsigned char *)X;                                         \
+      fprintf(stderr, "  <start at %p>\n", X);                        \
+      for (i = 0; i < XS ; ++x, ++i) {                                \
+          fprintf(stderr, "    %02X. <%p:%02X>\n", i, x, *x);         \
+      }                                                               \
+      fprintf(stderr, "  <end for %p after %d bytes>\n", X, XS);      \
+} while (0)
+
+#define _pam_show_reply(/* struct pam_response * */reply, /* int */replies) \
+do {                                                                        \
+    int reply_i;                                                            \
+    setbuf(stderr, NULL);                                                   \
+    fprintf(stderr, "array at %p of size %d\n",reply,replies);              \
+    fflush(stderr);                                                         \
+    if (reply) {                                                            \
+	for (reply_i = 0; reply_i < replies; reply_i++) {                   \
+	    fprintf(stderr, "  elem# %d at %p: resp = %p, retcode = %d\n",  \
+		    reply_i, reply+reply_i, reply[reply_i].resp,            \
+		    reply[reply_i].resp, _retcode);                         \
+	    fflush(stderr);                                                 \
+	    if (reply[reply_i].resp) {                                      \
+		fprintf(stderr, "    resp[%d] = '%s'\n",                    \
+			strlen(reply[reply_i].resp), reply[reply_i].resp);  \
+		fflush(stderr);                                             \
+	    }                                                               \
+	}                                                                   \
+    }                                                                       \
+    fprintf(stderr, "done here\n");                                         \
+    fflush(stderr);                                                         \
+} while (0)
+
+#else
+
+#define D(x)                             do { } while (0)
+#define _pam_show_mem(X,XS)              do { } while (0)
+#define _pam_show_reply(reply, replies)  do { } while (0)
+
+#endif /* PAM_DEBUG */
+
+#endif  /* PAM_MACROS_H */
diff --git a/libpam/include/security/_pam_types.h b/libpam/include/security/_pam_types.h
new file mode 100644
index 0000000..2abb7ee
--- /dev/null
+++ b/libpam/include/security/_pam_types.h
@@ -0,0 +1,333 @@
+/*
+ * <security/_pam_types.h>
+ *
+ * This file defines all of the types common to the Linux-PAM library
+ * applications and modules.
+ *
+ * Note, the copyright+license information is at end of file.
+ */
+
+#ifndef _SECURITY__PAM_TYPES_H
+#define _SECURITY__PAM_TYPES_H
+
+/* This is a blind structure; users aren't allowed to see inside a
+ * pam_handle_t, so we don't define struct pam_handle here.  This is
+ * defined in a file private to the PAM library.  (i.e., it's private
+ * to PAM service modules, too!)  */
+
+typedef struct pam_handle pam_handle_t;
+
+/* ---------------- The Linux-PAM Version defines ----------------- */
+
+/* Major and minor version number of the Linux-PAM package.  Use
+   these macros to test for features in specific releases.  */
+#define __LINUX_PAM__ 1
+#define __LINUX_PAM_MINOR__ 0
+
+/* ----------------- The Linux-PAM return values ------------------ */
+
+#define PAM_SUCCESS 0		/* Successful function return */
+#define PAM_OPEN_ERR 1		/* dlopen() failure when dynamically */
+				/* loading a service module */
+#define PAM_SYMBOL_ERR 2	/* Symbol not found */
+#define PAM_SERVICE_ERR 3	/* Error in service module */
+#define PAM_SYSTEM_ERR 4	/* System error */
+#define PAM_BUF_ERR 5		/* Memory buffer error */
+#define PAM_PERM_DENIED 6	/* Permission denied */
+#define PAM_AUTH_ERR 7		/* Authentication failure */
+#define PAM_CRED_INSUFFICIENT 8	/* Can not access authentication data */
+				/* due to insufficient credentials */
+#define PAM_AUTHINFO_UNAVAIL 9	/* Underlying authentication service */
+				/* can not retrieve authentication */
+				/* information  */
+#define PAM_USER_UNKNOWN 10	/* User not known to the underlying */
+				/* authentication module */
+#define PAM_MAXTRIES 11		/* An authentication service has */
+				/* maintained a retry count which has */
+				/* been reached.  No further retries */
+				/* should be attempted */
+#define PAM_NEW_AUTHTOK_REQD 12	/* New authentication token required. */
+				/* This is normally returned if the */
+				/* machine security policies require */
+				/* that the password should be changed */
+				/* because the password is NULL or it */
+				/* has aged */
+#define PAM_ACCT_EXPIRED 13	/* User account has expired */
+#define PAM_SESSION_ERR 14	/* Can not make/remove an entry for */
+				/* the specified session */
+#define PAM_CRED_UNAVAIL 15	/* Underlying authentication service */
+				/* can not retrieve user credentials */
+                                /* unavailable */
+#define PAM_CRED_EXPIRED 16	/* User credentials expired */
+#define PAM_CRED_ERR 17		/* Failure setting user credentials */
+#define PAM_NO_MODULE_DATA 18	/* No module specific data is present */
+#define PAM_CONV_ERR 19		/* Conversation error */
+#define PAM_AUTHTOK_ERR 20	/* Authentication token manipulation error */
+#define PAM_AUTHTOK_RECOVERY_ERR 21 /* Authentication information */
+				    /* cannot be recovered */
+#define PAM_AUTHTOK_LOCK_BUSY 22   /* Authentication token lock busy */
+#define PAM_AUTHTOK_DISABLE_AGING 23 /* Authentication token aging disabled */
+#define PAM_TRY_AGAIN 24	/* Preliminary check by password service */
+#define PAM_IGNORE 25		/* Ignore underlying account module */
+				/* regardless of whether the control */
+				/* flag is required, optional, or sufficient */
+#define PAM_ABORT 26            /* Critical error (?module fail now request) */
+#define PAM_AUTHTOK_EXPIRED  27 /* user's authentication token has expired */
+#define PAM_MODULE_UNKNOWN   28 /* module is not known */
+
+#define PAM_BAD_ITEM         29 /* Bad item passed to pam_*_item() */
+#define PAM_CONV_AGAIN       30 /* conversation function is event driven
+				     and data is not available yet */
+#define PAM_INCOMPLETE       31 /* please call this function again to
+				   complete authentication stack. Before
+				   calling again, verify that conversation
+				   is completed */
+
+/*
+ * Add new #define's here - take care to also extend the libpam code:
+ * pam_strerror() and "libpam/pam_tokens.h" .
+ */
+
+#define _PAM_RETURN_VALUES 32   /* this is the number of return values */
+
+
+/* ---------------------- The Linux-PAM flags -------------------- */
+
+/* Authentication service should not generate any messages */
+#define PAM_SILENT			0x8000U
+
+/* Note: these flags are used by pam_authenticate{,_secondary}() */
+
+/* The authentication service should return PAM_AUTH_ERROR if the
+ * user has a null authentication token */
+#define PAM_DISALLOW_NULL_AUTHTOK	0x0001U
+
+/* Note: these flags are used for pam_setcred() */
+
+/* Set user credentials for an authentication service */
+#define PAM_ESTABLISH_CRED              0x0002U
+
+/* Delete user credentials associated with an authentication service */
+#define PAM_DELETE_CRED                 0x0004U
+
+/* Reinitialize user credentials */
+#define PAM_REINITIALIZE_CRED           0x0008U
+
+/* Extend lifetime of user credentials */
+#define PAM_REFRESH_CRED                0x0010U
+
+/* Note: these flags are used by pam_chauthtok */
+
+/* The password service should only update those passwords that have
+ * aged.  If this flag is not passed, the password service should
+ * update all passwords. */
+#define PAM_CHANGE_EXPIRED_AUTHTOK	0x0020U
+
+/* ------------------ The Linux-PAM item types ------------------- */
+
+/* These defines are used by pam_set_item() and pam_get_item().
+   Please check the spec which are allowed for use by applications
+   and which are only allowed for use by modules. */
+
+#define PAM_SERVICE	   1	/* The service name */
+#define PAM_USER           2	/* The user name */
+#define PAM_TTY            3	/* The tty name */
+#define PAM_RHOST          4	/* The remote host name */
+#define PAM_CONV           5	/* The pam_conv structure */
+#define PAM_AUTHTOK        6	/* The authentication token (password) */
+#define PAM_OLDAUTHTOK     7	/* The old authentication token */
+#define PAM_RUSER          8	/* The remote user name */
+#define PAM_USER_PROMPT    9    /* the prompt for getting a username */
+/* Linux-PAM extensions */
+#define PAM_FAIL_DELAY     10   /* app supplied function to override failure
+				   delays */
+#define PAM_XDISPLAY       11   /* X display name */
+#define PAM_XAUTHDATA      12   /* X server authentication data */
+#define PAM_AUTHTOK_TYPE   13   /* The type for pam_get_authtok */
+
+/* -------------- Special defines used by Linux-PAM -------------- */
+
+#if defined(__GNUC__) && defined(__GNUC_MINOR__)
+# define PAM_GNUC_PREREQ(maj, min) \
+        ((__GNUC__ << 16) + __GNUC_MINOR__ >= ((maj) << 16) + (min))
+#else
+# define PAM_GNUC_PREREQ(maj, min) 0
+#endif
+
+#if PAM_GNUC_PREREQ(2,5)
+# define PAM_FORMAT(params) __attribute__((__format__ params))
+#else
+# define PAM_FORMAT(params)
+#endif
+
+#if PAM_GNUC_PREREQ(3,3) && !defined(LIBPAM_COMPILE)
+# define PAM_NONNULL(params) __attribute__((__nonnull__ params))
+#else
+# define PAM_NONNULL(params)
+#endif
+
+/* ---------- Common Linux-PAM application/module PI ----------- */
+
+extern int PAM_NONNULL((1))
+pam_set_item(pam_handle_t *pamh, int item_type, const void *item);
+
+extern int PAM_NONNULL((1))
+pam_get_item(const pam_handle_t *pamh, int item_type, const void **item);
+
+extern const char *
+pam_strerror(pam_handle_t *pamh, int errnum);
+
+extern int PAM_NONNULL((1,2))
+pam_putenv(pam_handle_t *pamh, const char *name_value);
+
+extern const char * PAM_NONNULL((1,2))
+pam_getenv(pam_handle_t *pamh, const char *name);
+
+extern char ** PAM_NONNULL((1))
+pam_getenvlist(pam_handle_t *pamh);
+
+/* ---------- Common Linux-PAM application/module PI ----------- */
+
+/*
+ * here are some proposed error status definitions for the
+ * 'error_status' argument used by the cleanup function associated
+ * with data items they should be logically OR'd with the error_status
+ * of the latest return from libpam -- new with .52 and positive
+ * impression from Sun although not official as of 1996/9/4
+ * [generally the other flags are to be found in pam_modules.h]
+ */
+
+#define PAM_DATA_SILENT    0x40000000     /* used to suppress messages... */
+
+/*
+ * here we define an externally (by apps or modules) callable function
+ * that primes the libpam library to delay when a stacked set of
+ * modules results in a failure. In the case of PAM_SUCCESS this delay
+ * is ignored.
+ *
+ * Note, the pam_[gs]et_item(... PAM_FAIL_DELAY ...) can be used to set
+ * a function pointer which can override the default fail-delay behavior.
+ * This item was added to accommodate event driven programs that need to
+ * manage delays more carefully.  The function prototype for this data
+ * item is
+ *     void (*fail_delay)(int status, unsigned int delay, void *appdata_ptr);
+ */
+
+#define HAVE_PAM_FAIL_DELAY
+extern int pam_fail_delay(pam_handle_t *pamh, unsigned int musec_delay);
+
+/* ------------ The Linux-PAM conversation structures ------------ */
+
+/* Message styles */
+
+#define PAM_PROMPT_ECHO_OFF	1
+#define PAM_PROMPT_ECHO_ON	2
+#define PAM_ERROR_MSG		3
+#define PAM_TEXT_INFO		4
+
+/* Linux-PAM specific types */
+
+#define PAM_RADIO_TYPE          5        /* yes/no/maybe conditionals */
+
+/* This is for server client non-human interaction.. these are NOT
+   part of the X/Open PAM specification. */
+
+#define PAM_BINARY_PROMPT       7
+
+/* maximum size of messages/responses etc.. (these are mostly
+   arbitrary so Linux-PAM should handle longer values). */
+
+#define PAM_MAX_NUM_MSG       32
+#define PAM_MAX_MSG_SIZE      512
+#define PAM_MAX_RESP_SIZE     512
+
+/* Used to pass prompting text, error messages, or other informatory
+ * text to the user.  This structure is allocated and freed by the PAM
+ * library (or loaded module).  */
+
+struct pam_message {
+    int msg_style;
+    const char *msg;
+};
+
+/* if the pam_message.msg_style = PAM_BINARY_PROMPT
+   the 'pam_message.msg' is a pointer to a 'const *' for the following
+   pseudo-structure.  When used with a PAM_BINARY_PROMPT, the returned
+   pam_response.resp pointer points to an object with the following
+   structure:
+
+   struct {
+       u32 length;                         #  network byte order
+       unsigned char type;
+       unsigned char data[length-5];
+   };
+
+   The 'libpamc' library is designed around this flavor of
+   message and should be used to handle this flavor of msg_style.
+   */
+
+/* Used to return the user's response to the PAM library.  This
+   structure is allocated by the application program, and free()'d by
+   the Linux-PAM library (or calling module).  */
+
+struct pam_response {
+    char *resp;
+    int	resp_retcode;	/* currently un-used, zero expected */
+};
+
+/* The actual conversation structure itself */
+
+struct pam_conv {
+    int (*conv)(int num_msg, const struct pam_message **msg,
+		struct pam_response **resp, void *appdata_ptr);
+    void *appdata_ptr;
+};
+
+/* Used by the PAM_XAUTHDATA pam item.  Contains X authentication
+   data used by modules to connect to the user's X display.  Note:
+   this structure is intentionally compatible with xcb_auth_info_t. */
+
+struct pam_xauth_data {
+    int namelen;
+    char *name;
+    int datalen;
+    char *data;
+};
+
+/* ... adapted from the pam_appl.h file created by Theodore Ts'o and
+ *
+ * Copyright Theodore Ts'o, 1996.  All rights reserved.
+ * Copyright (c) Andrew G. Morgan <morgan@linux.kernel.org>, 1996-8
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.  */
+
+#endif /* _SECURITY__PAM_TYPES_H */
diff --git a/libpam/include/security/pam_appl.h b/libpam/include/security/pam_appl.h
new file mode 100644
index 0000000..cf97a49
--- /dev/null
+++ b/libpam/include/security/pam_appl.h
@@ -0,0 +1,104 @@
+/*
+ * <security/pam_appl.h>
+ *
+ * This header file collects definitions for the PAM API --- that is,
+ * public interface between the PAM library and an application program
+ * that wishes to use it.
+ *
+ * Note, the copyright information is at end of file.
+ */
+
+#ifndef _SECURITY_PAM_APPL_H
+#define _SECURITY_PAM_APPL_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <security/_pam_types.h>      /* Linux-PAM common defined types */
+
+/* -------------- The Linux-PAM Framework layer API ------------- */
+
+extern int PAM_NONNULL((1,3,4))
+pam_start(const char *service_name, const char *user,
+	  const struct pam_conv *pam_conversation,
+	  pam_handle_t **pamh);
+
+extern int PAM_NONNULL((1,3,5))
+pam_start_confdir(const char *service_name, const char *user,
+		  const struct pam_conv *pam_conversation,
+		  const char *confdir, pam_handle_t **pamh);
+
+extern int PAM_NONNULL((1))
+pam_end(pam_handle_t *pamh, int pam_status);
+
+/* Authentication API's */
+
+extern int PAM_NONNULL((1))
+pam_authenticate(pam_handle_t *pamh, int flags);
+
+extern int PAM_NONNULL((1))
+pam_setcred(pam_handle_t *pamh, int flags);
+
+/* Account Management API's */
+
+extern int PAM_NONNULL((1))
+pam_acct_mgmt(pam_handle_t *pamh, int flags);
+
+/* Session Management API's */
+
+extern int PAM_NONNULL((1))
+pam_open_session(pam_handle_t *pamh, int flags);
+
+extern int PAM_NONNULL((1))
+pam_close_session(pam_handle_t *pamh, int flags);
+
+/* Password Management API's */
+
+extern int PAM_NONNULL((1))
+pam_chauthtok(pam_handle_t *pamh, int flags);
+
+
+/* take care of any compatibility issues */
+#include <security/_pam_compat.h>
+
+#ifdef __cplusplus
+}
+#endif
+
+/*
+ * Copyright Theodore Ts'o, 1996.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#endif /* _SECURITY_PAM_APPL_H */
diff --git a/libpam/include/security/pam_ext.h b/libpam/include/security/pam_ext.h
new file mode 100644
index 0000000..7542861
--- /dev/null
+++ b/libpam/include/security/pam_ext.h
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2005, 2006, 2008, 2009 Thorsten Kukuk.
+ *
+ * <security/pam_ext.h>
+ *
+ * This header file collects definitions for the extended PAM API.
+ * This is a public interface of the PAM library for PAM modules,
+ * which makes the life of PAM developers easier, but are not documented
+ * in any standard and are not portable between different PAM
+ * implementations.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _SECURITY__PAM_EXT_H_
+#define _SECURITY__PAM_EXT_H_
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <security/_pam_types.h>
+#include <stdarg.h>
+
+extern void PAM_FORMAT((printf, 3, 0)) PAM_NONNULL((3))
+pam_vsyslog (const pam_handle_t *pamh, int priority,
+             const char *fmt, va_list args);
+
+extern void PAM_FORMAT((printf, 3, 4)) PAM_NONNULL((3))
+pam_syslog (const pam_handle_t *pamh, int priority, const char *fmt, ...);
+
+extern int PAM_FORMAT((printf, 4, 0)) PAM_NONNULL((1,4))
+pam_vprompt (pam_handle_t *pamh, int style, char **response,
+	     const char *fmt, va_list args);
+
+extern int PAM_FORMAT((printf, 4, 5)) PAM_NONNULL((1,4))
+pam_prompt (pam_handle_t *pamh, int style, char **response,
+	    const char *fmt, ...);
+
+#define pam_error(pamh, fmt...) \
+	pam_prompt(pamh, PAM_ERROR_MSG, NULL, fmt)
+#define pam_verror(pamh, fmt, args) \
+	pam_vprompt(pamh, PAM_ERROR_MSG, NULL, fmt, args)
+
+#define pam_info(pamh, fmt...) pam_prompt(pamh, PAM_TEXT_INFO, NULL, fmt)
+#define pam_vinfo(pamh, fmt, args) pam_vprompt(pamh, PAM_TEXT_INFO, NULL, fmt, args)
+
+extern int PAM_NONNULL((1,3))
+pam_get_authtok (pam_handle_t *pamh, int item, const char **authtok,
+		 const char *prompt);
+extern int PAM_NONNULL((1,2))
+pam_get_authtok_noverify (pam_handle_t *pamh, const char **authtok,
+			  const char *prompt);
+extern int PAM_NONNULL((1,2))
+pam_get_authtok_verify (pam_handle_t *pamh, const char **authtok,
+			const char *prompt);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/libpam/include/security/pam_modules.h b/libpam/include/security/pam_modules.h
new file mode 100644
index 0000000..ec65e3e
--- /dev/null
+++ b/libpam/include/security/pam_modules.h
@@ -0,0 +1,124 @@
+/*
+ * <security/pam_modules.h>
+ *
+ * This header file collects definitions for the PAM API --- that is,
+ * public interface between the PAM library and PAM modules.
+ *
+ * Note, the copyright information is at end of file.
+ */
+
+#ifndef _SECURITY_PAM_MODULES_H
+#define _SECURITY_PAM_MODULES_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <security/_pam_types.h>      /* Linux-PAM common defined types */
+
+/* -------------- The Linux-PAM Module PI ------------- */
+
+extern int PAM_NONNULL((1,2))
+pam_set_data(pam_handle_t *pamh, const char *module_data_name, void *data,
+	     void (*cleanup)(pam_handle_t *pamh, void *data,
+			     int error_status));
+
+extern int PAM_NONNULL((1,2,3))
+pam_get_data(const pam_handle_t *pamh, const char *module_data_name,
+	     const void **data);
+
+extern int PAM_NONNULL((1,2))
+pam_get_user(pam_handle_t *pamh, const char **user, const char *prompt);
+
+/* Authentication API's */
+int pam_sm_authenticate(pam_handle_t *pamh, int flags,
+                        int argc, const char **argv);
+int pam_sm_setcred(pam_handle_t *pamh, int flags,
+		   int argc, const char **argv);
+
+/* Account Management API's */
+int pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
+		     int argc, const char **argv);
+
+/* Session Management API's */
+int pam_sm_open_session(pam_handle_t *pamh, int flags,
+			int argc, const char **argv);
+
+int pam_sm_close_session(pam_handle_t *pamh, int flags,
+			 int argc, const char **argv);
+
+/* Password Management API's */
+int pam_sm_chauthtok(pam_handle_t *pamh, int flags,
+		     int argc, const char **argv);
+
+/* The following two flags are for use across the Linux-PAM/module
+ * interface only. The Application is not permitted to use these
+ * tokens.
+ *
+ * The password service should only perform preliminary checks.  No
+ * passwords should be updated. */
+#define PAM_PRELIM_CHECK		0x4000
+
+/* The password service should update passwords Note: PAM_PRELIM_CHECK
+ * and PAM_UPDATE_AUTHTOK cannot both be set simultaneously! */
+#define PAM_UPDATE_AUTHTOK		0x2000
+
+
+/*
+ * here are some proposed error status definitions for the
+ * 'error_status' argument used by the cleanup function associated
+ * with data items they should be logically OR'd with the error_status
+ * of the latest return from libpam -- new with .52 and positive
+ * impression from Sun although not official as of 1996/9/4 there are
+ * others in _pam_types.h -- they are for common module/app use.
+ */
+
+#define PAM_DATA_REPLACE   0x20000000     /* used when replacing a data item */
+
+/* PAM_EXTERN isn't needed anymore, but don't remove it to not break
+   lot of external code using it. */
+#define PAM_EXTERN extern
+
+/* take care of any compatibility issues */
+#include <security/_pam_compat.h>
+
+#ifdef __cplusplus
+}
+#endif
+
+/* Copyright (C) Theodore Ts'o, 1996.
+ * Copyright (C) Andrew Morgan, 1996-8.
+ *                                                All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU General Public License, in which case the provisions of the
+ * GNU GPL are required INSTEAD OF the above restrictions.  (This
+ * clause is necessary due to a potential bad interaction between the
+ * GNU GPL and the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.  */
+
+#endif /* _SECURITY_PAM_MODULES_H */
diff --git a/libpam/include/security/pam_modutil.h b/libpam/include/security/pam_modutil.h
new file mode 100644
index 0000000..33f87b9
--- /dev/null
+++ b/libpam/include/security/pam_modutil.h
@@ -0,0 +1,160 @@
+/*
+ * Copyright (c) 2001-2002 Andrew Morgan <morgan@kernel.org>
+ *
+ * <security/pam_modutil.h>
+ *
+ * This file is a list of handy libc wrappers that attempt to provide some
+ * thread-safe and other convenient functionality to modules in a common form.
+ *
+ * A number of these functions reserve space in a pam_[sg]et_data item.
+ * In all cases, the name of the item is prefixed with "pam_modutil_*".
+ *
+ * On systems that simply can't support thread safe programming, these
+ * functions don't support it either - sorry.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef _SECURITY__PAM_MODUTIL_H
+#define _SECURITY__PAM_MODUTIL_H
+
+#include <sys/types.h>
+#include <pwd.h>
+#include <grp.h>
+#include <shadow.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <security/_pam_types.h>
+
+extern int PAM_NONNULL((1,2))
+pam_modutil_check_user_in_passwd(pam_handle_t *pamh,
+                                 const char *user_name,
+                                 const char *file_name);
+
+extern struct passwd * PAM_NONNULL((1,2))
+pam_modutil_getpwnam(pam_handle_t *pamh, const char *user);
+
+extern struct passwd * PAM_NONNULL((1))
+pam_modutil_getpwuid(pam_handle_t *pamh, uid_t uid);
+
+extern struct group  * PAM_NONNULL((1,2))
+pam_modutil_getgrnam(pam_handle_t *pamh, const char *group);
+
+extern struct group  * PAM_NONNULL((1))
+pam_modutil_getgrgid(pam_handle_t *pamh, gid_t gid);
+
+extern struct spwd   * PAM_NONNULL((1,2))
+pam_modutil_getspnam(pam_handle_t *pamh, const char *user);
+
+extern int PAM_NONNULL((1,2,3))
+pam_modutil_user_in_group_nam_nam(pam_handle_t *pamh,
+                                  const char *user,
+                                  const char *group);
+
+extern int PAM_NONNULL((1,2))
+pam_modutil_user_in_group_nam_gid(pam_handle_t *pamh,
+                                  const char *user,
+                                  gid_t group);
+
+extern int PAM_NONNULL((1,3))
+pam_modutil_user_in_group_uid_nam(pam_handle_t *pamh,
+                                  uid_t user,
+                                  const char *group);
+
+extern int PAM_NONNULL((1))
+pam_modutil_user_in_group_uid_gid(pam_handle_t *pamh,
+                                  uid_t user,
+                                  gid_t group);
+
+extern const char * PAM_NONNULL((1))
+pam_modutil_getlogin(pam_handle_t *pamh);
+
+extern int
+pam_modutil_read(int fd, char *buffer, int count);
+
+extern int
+pam_modutil_write(int fd, const char *buffer, int count);
+
+extern int PAM_NONNULL((1,3))
+pam_modutil_audit_write(pam_handle_t *pamh, int type,
+			const char *message, int retval);
+
+struct pam_modutil_privs {
+	gid_t *grplist;
+	int number_of_groups;
+	int allocated;
+	gid_t old_gid;
+	uid_t old_uid;
+	int is_dropped;
+};
+
+#define PAM_MODUTIL_NGROUPS     64
+#define PAM_MODUTIL_DEF_PRIVS(n) \
+	gid_t n##_grplist[PAM_MODUTIL_NGROUPS]; \
+	struct pam_modutil_privs n = { n##_grplist, PAM_MODUTIL_NGROUPS, 0, -1, -1, 0 }
+
+extern int PAM_NONNULL((1,2,3))
+pam_modutil_drop_priv(pam_handle_t *pamh,
+		      struct pam_modutil_privs *p,
+		      const struct passwd *pw);
+
+extern int PAM_NONNULL((1,2))
+pam_modutil_regain_priv(pam_handle_t *pamh,
+		      struct pam_modutil_privs *p);
+
+enum pam_modutil_redirect_fd {
+	PAM_MODUTIL_IGNORE_FD,	/* do not redirect */
+	PAM_MODUTIL_PIPE_FD,	/* redirect to a pipe */
+	PAM_MODUTIL_NULL_FD,	/* redirect to /dev/null */
+};
+
+/* redirect standard descriptors, close all other descriptors. */
+extern int PAM_NONNULL((1))
+pam_modutil_sanitize_helper_fds(pam_handle_t *pamh,
+				enum pam_modutil_redirect_fd redirect_stdin,
+				enum pam_modutil_redirect_fd redirect_stdout,
+				enum pam_modutil_redirect_fd redirect_stderr);
+
+/* lookup a value for key in login.defs file or similar key value format */
+extern char * PAM_NONNULL((1,2,3))
+pam_modutil_search_key(pam_handle_t *pamh,
+		       const char *file_name,
+		       const char *key);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* _SECURITY__PAM_MODUTIL_H */
diff --git a/libpam/include/test_assert.h b/libpam/include/test_assert.h
new file mode 100644
index 0000000..9d30d62
--- /dev/null
+++ b/libpam/include/test_assert.h
@@ -0,0 +1,55 @@
+/*
+ * Assert definitions for tests.
+ *
+ * Copyright (c) 2020 Dmitry V. Levin <ldv@altlinux.org>
+ */
+
+#ifndef TEST_ASSERT_H
+# define TEST_ASSERT_H
+
+# ifdef HAVE_CONFIG_H
+#  include <config.h>
+# endif
+
+# include <stdio.h>
+# include <stdlib.h>
+
+# define ASSERT_(expected_, expected_str_, op_, seen_, seen_str_)		\
+	do {									\
+		__typeof__(expected_) e_ = (expected_);				\
+		__typeof__(seen_) s_ = (seen_);					\
+		if (e_ op_ s_) break;						\
+		fprintf(stderr,							\
+			"%s:%d: Assertion failed: %s (%#lx) %s %s (%#lx)\n",	\
+			__FILE__, __LINE__,					\
+			(expected_str_), (unsigned long) e_, #op_,		\
+			(seen_str_), (unsigned long) s_);			\
+		abort();							\
+	} while (0)								\
+/* End of ASSERT_ definition.  */
+
+# define ASSERT_EQ(expected_, seen_)						\
+	ASSERT_((expected_), #expected_, ==, (seen_), #seen_)			\
+/* End of ASSERT_EQ definition.  */
+
+# define ASSERT_NE(expected_, seen_)						\
+	ASSERT_((expected_), #expected_, !=, (seen_), #seen_)			\
+/* End of ASSERT_NE definition.  */
+
+# define ASSERT_LT(expected_, seen_)						\
+	ASSERT_((expected_), #expected_, <, (seen_), #seen_)			\
+/* End of ASSERT_LT definition.  */
+
+# define ASSERT_LE(expected_, seen_)						\
+	ASSERT_((expected_), #expected_, <=, (seen_), #seen_)			\
+/* End of ASSERT_LT definition.  */
+
+# define ASSERT_GT(expected_, seen_)						\
+	ASSERT_((expected_), #expected_, >, (seen_), #seen_)			\
+/* End of ASSERT_LT definition.  */
+
+# define ASSERT_GE(expected_, seen_)						\
+	ASSERT_((expected_), #expected_, >=, (seen_), #seen_)			\
+/* End of ASSERT_LT definition.  */
+
+#endif /* TEST_ASSERT_H */
diff --git a/libpam/libpam.map b/libpam/libpam.map
new file mode 100644
index 0000000..3cc7ef3
--- /dev/null
+++ b/libpam/libpam.map
@@ -0,0 +1,89 @@
+LIBPAM_1.0 {
+  global:
+    pam_acct_mgmt;
+    pam_authenticate;
+    pam_chauthtok;
+    pam_close_session;
+    pam_end;
+    pam_open_session;
+    pam_setcred;
+    pam_start;
+    pam_getenv;
+    pam_putenv;
+    pam_getenvlist;
+    pam_set_item;
+    pam_get_item;
+    pam_strerror;
+    pam_fail_delay;
+    pam_set_data;
+    pam_get_data;
+    pam_get_user;
+
+  local:
+    *;
+};
+LIBPAM_EXTENSION_1.0 {
+  global:
+    pam_prompt;
+    pam_vprompt;
+    pam_syslog;
+    pam_vsyslog;
+};
+
+LIBPAM_EXTENSION_1.1 {
+  global:
+    pam_get_authtok;
+} LIBPAM_EXTENSION_1.0;
+
+LIBPAM_EXTENSION_1.1.1 {
+  global:
+    pam_get_authtok_noverify;
+    pam_get_authtok_verify;
+} LIBPAM_EXTENSION_1.1;
+
+LIBPAM_MODUTIL_1.0 {
+  global:
+    pam_modutil_getpwnam;
+    pam_modutil_getpwuid;
+    pam_modutil_getgrnam;
+    pam_modutil_getgrgid;
+    pam_modutil_getspnam;
+    pam_modutil_user_in_group_nam_nam;
+    pam_modutil_user_in_group_nam_gid;
+    pam_modutil_user_in_group_uid_nam;
+    pam_modutil_user_in_group_uid_gid;
+    pam_modutil_getlogin;
+    pam_modutil_read;
+    pam_modutil_write;
+};
+
+LIBPAM_MODUTIL_1.1 {
+  global:
+    pam_modutil_audit_write;
+} LIBPAM_MODUTIL_1.0;
+
+LIBPAM_MODUTIL_1.1.3 {
+  global:
+    pam_modutil_drop_priv;
+    pam_modutil_regain_priv;
+} LIBPAM_MODUTIL_1.1;
+
+LIBPAM_MODUTIL_1.1.9 {
+  global:
+    pam_modutil_sanitize_helper_fds;
+} LIBPAM_MODUTIL_1.1.3;
+
+LIBPAM_MODUTIL_1.3.2 {
+  global:
+    pam_modutil_search_key;
+} LIBPAM_MODUTIL_1.1.9;
+
+LIBPAM_1.4 {
+  global:
+    pam_start_confdir;
+} LIBPAM_1.0;
+
+LIBPAM_MODUTIL_1.4.1 {
+  global:
+    pam_modutil_check_user_in_passwd;
+} LIBPAM_MODUTIL_1.3.2;
diff --git a/libpam/pam.pc.in b/libpam/pam.pc.in
new file mode 100644
index 0000000..a7cf852
--- /dev/null
+++ b/libpam/pam.pc.in
@@ -0,0 +1,9 @@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: PAM
+Description: The primary Linux-PAM library. It is used by PAM modules and PAM-aware applications.
+URL: http://www.linux-pam.org/
+Version: @VERSION@
+Cflags: -I${includedir}
+Libs: -L${libdir} -lpam
diff --git a/libpam/pam_account.c b/libpam/pam_account.c
new file mode 100644
index 0000000..3a4fb1f
--- /dev/null
+++ b/libpam/pam_account.c
@@ -0,0 +1,23 @@
+/* pam_account.c - PAM Account Management */
+
+#include "pam_private.h"
+
+#include <stdio.h>
+
+int pam_acct_mgmt(pam_handle_t *pamh, int flags)
+{
+    int retval;
+
+    D(("called"));
+
+    IF_NO_PAMH("pam_acct_mgmt", pamh, PAM_SYSTEM_ERR);
+
+    if (__PAM_FROM_MODULE(pamh)) {
+	D(("called from module!?"));
+	return PAM_SYSTEM_ERR;
+    }
+
+    retval = _pam_dispatch(pamh, flags, PAM_ACCOUNT);
+
+    return retval;
+}
diff --git a/libpam/pam_audit.c b/libpam/pam_audit.c
new file mode 100644
index 0000000..97a9a92
--- /dev/null
+++ b/libpam/pam_audit.c
@@ -0,0 +1,242 @@
+/* pam_audit.c -- Instrumentation code for Linux Auditing System  */
+
+/* (C) 2005-2006 Red Hat, Inc. -- Licensing details are in the COPYING
+   file accompanying the Linux-PAM source distribution.
+
+   Authors:
+   Steve Grubb <sgrubb@redhat.com> */
+
+#include "pam_private.h"
+#include "pam_modutil_private.h"
+
+#ifdef HAVE_LIBAUDIT
+#include <stdio.h>
+#include <syslog.h>
+#include <libaudit.h>
+#include <pwd.h>
+#include <netdb.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <arpa/inet.h>
+#include <errno.h>
+
+#define PAMAUDIT_LOGGED 1
+
+static int
+_pam_audit_writelog(pam_handle_t *pamh, int audit_fd, int type,
+	const char *message, const char *grantors, int retval)
+{
+  static int old_errno = -1;
+  int rc = -ENOMEM;
+  char *buf;
+  const char *grantors_field = " grantors=";
+
+  if (grantors == NULL) {
+      grantors = "";
+      grantors_field = "";
+  }
+
+  if (asprintf(&buf, "PAM:%s%s%s", message, grantors_field, grantors) >= 0) {
+      rc = audit_log_acct_message(audit_fd, type, NULL, buf,
+	(retval != PAM_USER_UNKNOWN && pamh->user) ? pamh->user : "?",
+	-1, pamh->rhost, NULL, pamh->tty, retval == PAM_SUCCESS);
+      free(buf);
+  }
+
+  /* libaudit sets errno to his own negative error code. This can be
+     an official errno number, but must not. It can also be a audit
+     internal error code. Which makes errno useless :-((. Try the
+     best to fix it. */
+  errno = -rc;
+
+  pamh->audit_state |= PAMAUDIT_LOGGED;
+
+  if (rc < 0) {
+      if (rc == -EPERM)
+          return 0;
+      if (errno != old_errno) {
+          old_errno = errno;
+          pam_syslog (pamh, LOG_CRIT, "audit_log_acct_message() failed: %m");
+      }
+  }
+  return rc;
+}
+
+static int
+_pam_audit_open(pam_handle_t *pamh)
+{
+  int audit_fd;
+  audit_fd = audit_open();
+  if (audit_fd < 0) {
+    /* You get these error codes only when the kernel doesn't have
+     * audit compiled in. */
+    if (errno == EINVAL || errno == EPROTONOSUPPORT ||
+        errno == EAFNOSUPPORT)
+        return -2;
+
+    /* this should only fail in case of extreme resource shortage,
+     * need to prevent login in that case for CAPP compliance.
+     */
+    pam_syslog(pamh, LOG_CRIT, "audit_open() failed: %m");
+    return -1;
+  }
+
+  return audit_fd;
+}
+
+static int
+_pam_list_grantors(struct handler *hlist, int retval, char **list)
+{
+  *list = NULL;
+
+  if (retval == PAM_SUCCESS) {
+    struct handler *h;
+    char *p = NULL;
+    size_t len = 0;
+
+    for (h = hlist; h != NULL; h = h->next) {
+      if (h->grantor) {
+        len += strlen(h->mod_name) + 1;
+      }
+    }
+
+    if (len == 0) {
+      return 0;
+    }
+
+    *list = malloc(len);
+    if (*list == NULL) {
+      return -1;
+    }
+
+    for (h = hlist; h != NULL; h = h->next) {
+      if (h->grantor) {
+        if (p == NULL) {
+          p = *list;
+        } else {
+          p = stpcpy(p, ",");
+        }
+
+        p = stpcpy(p, h->mod_name);
+      }
+    }
+  }
+
+  return 0;
+}
+
+int
+_pam_auditlog(pam_handle_t *pamh, int action, int retval, int flags, struct handler *h)
+{
+  const char *message;
+  int type;
+  int audit_fd;
+  char *grantors;
+
+  if ((audit_fd=_pam_audit_open(pamh)) == -1) {
+    return PAM_SYSTEM_ERR;
+  } else if (audit_fd == -2) {
+    return retval;
+  }
+
+  switch (action) {
+  case PAM_AUTHENTICATE:
+    message = "authentication";
+    type = AUDIT_USER_AUTH;
+    break;
+  case PAM_OPEN_SESSION:
+    message = "session_open";
+    type = AUDIT_USER_START;
+    break;
+  case PAM_CLOSE_SESSION:
+    message = "session_close";
+    type = AUDIT_USER_END;
+    break;
+  case PAM_ACCOUNT:
+    message = "accounting";
+    type = AUDIT_USER_ACCT;
+    break;
+  case PAM_CHAUTHTOK:
+    message = "chauthtok";
+    type = AUDIT_USER_CHAUTHTOK;
+    break;
+  case PAM_SETCRED:
+    message = "setcred";
+    if (flags & PAM_ESTABLISH_CRED)
+	type = AUDIT_CRED_ACQ;
+    else if ((flags & PAM_REINITIALIZE_CRED) || (flags & PAM_REFRESH_CRED))
+	type = AUDIT_CRED_REFR;
+    else if (flags & PAM_DELETE_CRED)
+	type = AUDIT_CRED_DISP;
+    else
+        type = AUDIT_USER_ERR;
+    break;
+  case _PAM_ACTION_DONE:
+    message = "bad_ident";
+    type = AUDIT_USER_ERR;
+    break;
+  default:
+    message = "UNKNOWN";
+    type = AUDIT_USER_ERR;
+    pam_syslog(pamh, LOG_CRIT, "_pam_auditlog() should never get here");
+    retval = PAM_SYSTEM_ERR;
+  }
+
+  if (_pam_list_grantors(h, retval, &grantors) < 0) {
+    /* allocation failure */
+    pam_syslog(pamh, LOG_CRIT, "_pam_list_grantors() failed: %m");
+    retval = PAM_SYSTEM_ERR;
+  }
+
+  if (_pam_audit_writelog(pamh, audit_fd, type, message,
+      grantors ? grantors : "?", retval) < 0)
+    retval = PAM_SYSTEM_ERR;
+
+  free(grantors);
+
+  audit_close(audit_fd);
+  return retval;
+}
+
+int
+_pam_audit_end(pam_handle_t *pamh, int status UNUSED)
+{
+  if (! (pamh->audit_state & PAMAUDIT_LOGGED)) {
+    /* PAM library is being shut down without any of the auditted
+     * stacks having been run. Assume that this is sshd faking
+     * things for an unknown user.
+     */
+    _pam_auditlog(pamh, _PAM_ACTION_DONE, PAM_USER_UNKNOWN, 0, NULL);
+  }
+
+  return 0;
+}
+
+int
+pam_modutil_audit_write(pam_handle_t *pamh, int type,
+    const char *message, int retval)
+{
+  int audit_fd;
+  int rc;
+
+  if ((audit_fd=_pam_audit_open(pamh)) == -1) {
+    return PAM_SYSTEM_ERR;
+  } else if (audit_fd == -2) {
+    return retval;
+  }
+
+  rc = _pam_audit_writelog(pamh, audit_fd, type, message, NULL, retval);
+
+  audit_close(audit_fd);
+
+  return rc < 0 ? PAM_SYSTEM_ERR : PAM_SUCCESS;
+}
+
+#else
+int pam_modutil_audit_write(pam_handle_t *pamh UNUSED, int type UNUSED,
+    const char *message UNUSED, int retval UNUSED)
+{
+  return PAM_SUCCESS;
+}
+#endif /* HAVE_LIBAUDIT */
diff --git a/libpam/pam_auth.c b/libpam/pam_auth.c
new file mode 100644
index 0000000..1e7bc6e
--- /dev/null
+++ b/libpam/pam_auth.c
@@ -0,0 +1,73 @@
+/*
+ * pam_auth.c -- PAM authentication
+ *
+ * $Id$
+ *
+ */
+
+#include "pam_private.h"
+#include "pam_prelude.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int pam_authenticate(pam_handle_t *pamh, int flags)
+{
+    int retval;
+
+    D(("pam_authenticate called"));
+
+    IF_NO_PAMH("pam_authenticate", pamh, PAM_SYSTEM_ERR);
+
+    if (__PAM_FROM_MODULE(pamh)) {
+	D(("called from module!?"));
+	return PAM_SYSTEM_ERR;
+    }
+
+    if (pamh->former.choice == PAM_NOT_STACKED) {
+	_pam_sanitize(pamh);
+	_pam_start_timer(pamh);    /* we try to make the time for a failure
+				      independent of the time it takes to
+				      fail */
+    }
+
+    retval = _pam_dispatch(pamh, flags, PAM_AUTHENTICATE);
+
+    if (retval != PAM_INCOMPLETE) {
+	_pam_sanitize(pamh);
+	_pam_await_timer(pamh, retval);   /* if unsuccessful then wait now */
+	D(("pam_authenticate exit"));
+    } else {
+	D(("will resume when ready"));
+    }
+
+#ifdef PRELUDE
+    prelude_send_alert(pamh, retval);
+#endif
+
+    return retval;
+}
+
+int pam_setcred(pam_handle_t *pamh, int flags)
+{
+    int retval;
+
+    D(("pam_setcred called"));
+
+    IF_NO_PAMH("pam_setcred", pamh, PAM_SYSTEM_ERR);
+
+    if (__PAM_FROM_MODULE(pamh)) {
+	D(("called from module!?"));
+	return PAM_SYSTEM_ERR;
+    }
+
+    if (! flags) {
+	flags = PAM_ESTABLISH_CRED;
+    }
+
+    retval = _pam_dispatch(pamh, flags, PAM_SETCRED);
+
+    D(("pam_setcred exit"));
+
+    return retval;
+}
diff --git a/libpam/pam_data.c b/libpam/pam_data.c
new file mode 100644
index 0000000..30570af
--- /dev/null
+++ b/libpam/pam_data.c
@@ -0,0 +1,166 @@
+/*
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#include "pam_private.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+static struct pam_data *_pam_locate_data(const pam_handle_t *pamh,
+					 const char *name)
+{
+    struct pam_data *data;
+
+    D(("called"));
+
+    IF_NO_PAMH("_pam_locate_data", pamh, NULL);
+
+    data = pamh->data;
+
+    while (data) {
+	if (!strcmp(data->name, name)) {
+	    return data;
+	}
+	data = data->next;
+    }
+
+    return NULL;
+}
+
+int pam_set_data(
+    pam_handle_t *pamh,
+    const char *module_data_name,
+    void *data,
+    void (*cleanup)(pam_handle_t *pamh, void *data, int error_status))
+{
+    struct pam_data *data_entry;
+
+    D(("called"));
+
+    IF_NO_PAMH("pam_set_data", pamh, PAM_SYSTEM_ERR);
+
+    if (__PAM_FROM_APP(pamh)) {
+	D(("called from application!?"));
+	return PAM_SYSTEM_ERR;
+    }
+
+    /* module_data_name should not be NULL */
+    if (module_data_name == NULL) {
+	D(("called with NULL as module_data_name"));
+	return PAM_SYSTEM_ERR;
+    }
+
+    /* first check if there is some data already. If so clean it up */
+
+    if ((data_entry = _pam_locate_data(pamh, module_data_name))) {
+	if (data_entry->cleanup) {
+	    data_entry->cleanup(pamh, data_entry->data,
+				PAM_DATA_REPLACE | PAM_SUCCESS );
+	}
+    } else if ((data_entry = malloc(sizeof(*data_entry)))) {
+	char *tname;
+
+	if ((tname = _pam_strdup(module_data_name)) == NULL) {
+	    pam_syslog(pamh, LOG_CRIT,
+		       "pam_set_data: no memory for data name");
+	    _pam_drop(data_entry);
+	    return PAM_BUF_ERR;
+	}
+	data_entry->next = pamh->data;
+	pamh->data = data_entry;
+	data_entry->name = tname;
+    } else {
+	pam_syslog(pamh, LOG_CRIT,
+		   "pam_set_data: cannot allocate data entry");
+	return PAM_BUF_ERR;
+    }
+
+    data_entry->data = data;           /* note this could be NULL */
+    data_entry->cleanup = cleanup;
+
+    return PAM_SUCCESS;
+}
+
+int pam_get_data(
+    const pam_handle_t *pamh,
+    const char *module_data_name,
+    const void **datap)
+{
+    struct pam_data *data;
+
+    D(("called"));
+
+    IF_NO_PAMH("pam_get_data", pamh, PAM_SYSTEM_ERR);
+
+    if (__PAM_FROM_APP(pamh)) {
+	D(("called from application!?"));
+	return PAM_SYSTEM_ERR;
+    }
+
+    /* module_data_name should not be NULL */
+    if (module_data_name == NULL) {
+	D(("called with NULL as module_data_name"));
+	return PAM_SYSTEM_ERR;
+    }
+
+    data = _pam_locate_data(pamh, module_data_name);
+    if (data) {
+	*datap = data->data;
+	return PAM_SUCCESS;
+    }
+
+    return PAM_NO_MODULE_DATA;
+}
+
+void _pam_free_data(pam_handle_t *pamh, int status)
+{
+    struct pam_data *last;
+    struct pam_data *data;
+
+    D(("called"));
+
+    IF_NO_PAMH("_pam_free_data", pamh, /* no return value for void fn */);
+    data = pamh->data;
+
+    while (data) {
+	last = data;
+	data = data->next;
+	if (last->cleanup) {
+	    last->cleanup(pamh, last->data, status);
+	}
+	_pam_drop(last->name);
+	_pam_drop(last);
+    }
+}
diff --git a/libpam/pam_delay.c b/libpam/pam_delay.c
new file mode 100644
index 0000000..549da89
--- /dev/null
+++ b/libpam/pam_delay.c
@@ -0,0 +1,160 @@
+/*
+ * pam_delay.c
+ *
+ * Copyright (c) Andrew G. Morgan <morgan@kernel.org> 1996-9
+ * All rights reserved.
+ *
+ * $Id$
+ *
+ */
+
+/*
+ * This is a simple implementation of a delay on failure mechanism; an
+ * attempt to overcome authentication-time attacks in a simple manner.
+ */
+
+#include "pam_private.h"
+#include <unistd.h>
+#include <time.h>
+
+/* **********************************************************************
+ * initialize the time as unset, this is set on the return from the
+ * authenticating pair of of the libpam pam_XXX calls.
+ */
+
+void _pam_reset_timer(pam_handle_t *pamh)
+{
+     D(("setting pamh->fail_delay.set to FALSE"));
+     pamh->fail_delay.set = PAM_FALSE;
+}
+
+/* **********************************************************************
+ * this function sets the start time for possible delayed failing.
+ *
+ * Eventually, it may set the timer so libpam knows how long the program
+ * has already been executing. Currently, this value is used to seed
+ * a pseudo-random number generator...
+ */
+
+void _pam_start_timer(pam_handle_t *pamh)
+{
+     pamh->fail_delay.begin = time(NULL);
+     D(("starting timer..."));
+}
+
+/* *******************************************************************
+ * Compute a pseudo random time. The value is base*(1 +/- 1/5) where
+ * the distribution is pseudo gaussian (the sum of three evenly
+ * distributed random numbers -- central limit theorem and all ;^) The
+ * linear random numbers are based on a formulae given in Knuth's
+ * Seminumerical recipes that was reproduced in `Numerical Recipes
+ * in C'. It is *not* a cryptographically strong generator, but it is
+ * probably "good enough" for our purposes here.
+ *
+ * /dev/random might be a better place to look for some numbers...
+ */
+
+static unsigned int _pam_rand(unsigned int seed)
+{
+#define N1 1664525
+#define N2 1013904223
+     return N1*seed + N2;
+}
+
+static unsigned int _pam_compute_delay(unsigned int seed, unsigned int base)
+{
+     int i;
+     double sum;
+     unsigned int ans;
+
+     for (sum=i=0; i<3; ++i) {
+	  seed = _pam_rand(seed);
+	  sum += (double) ((seed / 10) % 1000000);
+     }
+     sum = (sum/3.)/1e6 - .5;                      /* rescale */
+     ans = (unsigned int) ( base*(1.+sum) );
+     D(("random number: base=%u -> ans=%u\n", base, ans));
+
+     return ans;
+}
+
+/* **********************************************************************
+ * By default, the following function sleeps for a random time. The
+ * actual time slept is computed above. It is based on the requested
+ * time but will differ by up to +/- 50%. If the PAM_FAIL_DELAY item is
+ * set by the client, this function will call the function referenced by
+ * that item, overriding the default behavior.
+ */
+
+void _pam_await_timer(pam_handle_t *pamh, int status)
+{
+    unsigned int delay;
+    D(("waiting?..."));
+
+    delay = _pam_compute_delay(pamh->fail_delay.begin,
+			       pamh->fail_delay.delay);
+    if (pamh->fail_delay.delay_fn_ptr) {
+	union {
+	    const void *value;
+	    void (*fn)(int, unsigned, void *);
+	} hack_fn_u;
+	void *appdata_ptr;
+
+	if (pamh->pam_conversation) {
+	    appdata_ptr = pamh->pam_conversation->appdata_ptr;
+	} else {
+	    appdata_ptr = NULL;
+	}
+
+	/* always call the applications delay function, even if
+	   the delay is zero - indicate status */
+	hack_fn_u.value = pamh->fail_delay.delay_fn_ptr;
+	hack_fn_u.fn(status, delay, appdata_ptr);
+
+    } else if (status != PAM_SUCCESS && pamh->fail_delay.set) {
+
+	D(("will wait %u usec", delay));
+
+	if (delay > 0) {
+	    struct timeval tval;
+
+	    tval.tv_sec  = delay / 1000000;
+	    tval.tv_usec = delay % 1000000;
+	    select(0, NULL, NULL, NULL, &tval);
+	}
+    }
+
+    _pam_reset_timer(pamh);
+    D(("waiting done"));
+}
+
+/* **********************************************************************
+ * this function is known to both the module and the application, it
+ * keeps a running score of the largest-requested delay so far, as
+ * specified by either modules or an application.
+ */
+
+int pam_fail_delay(pam_handle_t *pamh, unsigned int usec)
+{
+     unsigned int largest;
+
+     IF_NO_PAMH("pam_fail_delay", pamh, PAM_SYSTEM_ERR);
+
+     D(("setting delay to %u",usec));
+
+     if (pamh->fail_delay.set) {
+          largest = pamh->fail_delay.delay;
+     } else {
+	  pamh->fail_delay.set = PAM_TRUE;
+          largest = 0;
+     }
+
+     D(("largest = %u",largest));
+
+     if (largest < usec) {
+          D(("resetting largest delay"));
+	  pamh->fail_delay.delay = usec;
+     }
+
+     return PAM_SUCCESS;
+}
diff --git a/libpam/pam_dispatch.c b/libpam/pam_dispatch.c
new file mode 100644
index 0000000..974104a
--- /dev/null
+++ b/libpam/pam_dispatch.c
@@ -0,0 +1,447 @@
+/* pam_dispatch.c - handles module function dispatch */
+
+/*
+ * Copyright (c) 1998, 2005 Andrew G. Morgan <morgan@kernel.org>
+ *
+ */
+
+#include "pam_private.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+
+/*
+ * this is the return code we return when a function pointer is NULL
+ * or, the handler structure indicates a broken module config line
+ */
+#define PAM_MUST_FAIL_CODE        PAM_PERM_DENIED
+
+/* impression codes - this gives some sense to the logical choices */
+#define _PAM_UNDEF     0
+#define _PAM_POSITIVE +1
+#define _PAM_NEGATIVE -1
+
+/* frozen chain required codes */
+#define _PAM_PLEASE_FREEZE  0
+#define _PAM_MAY_BE_FROZEN  1
+#define _PAM_MUST_BE_FROZEN 2
+
+/*
+ * walk a stack of modules.  Interpret the administrator's instructions
+ * when combining the return code of each module.
+ */
+
+static int _pam_dispatch_aux(pam_handle_t *pamh, int flags, struct handler *h,
+			     _pam_boolean resumed, int use_cached_chain)
+{
+    int depth, impression, status, skip_depth, prev_level, stack_level;
+    struct _pam_substack_state *substates = NULL;
+
+    IF_NO_PAMH("_pam_dispatch_aux", pamh, PAM_SYSTEM_ERR);
+
+    if (h == NULL) {
+        const void *service=NULL;
+
+	(void) pam_get_item(pamh, PAM_SERVICE, &service);
+	pam_syslog(pamh, LOG_ERR, "no modules loaded for `%s' service",
+		   service ? (const char *)service:"<unknown>" );
+	service = NULL;
+	return PAM_MUST_FAIL_CODE;
+    }
+
+    /* if we are recalling this module stack because a former call did
+       not complete, we restore the state of play from pamh. */
+    if (resumed) {
+	skip_depth = pamh->former.depth;
+	status = pamh->former.status;
+	impression = pamh->former.impression;
+	substates = pamh->former.substates;
+	/* forget all that */
+	pamh->former.impression = _PAM_UNDEF;
+	pamh->former.status = PAM_MUST_FAIL_CODE;
+	pamh->former.depth = 0;
+	pamh->former.substates = NULL;
+    } else {
+	skip_depth = 0;
+	substates = malloc(PAM_SUBSTACK_MAX_LEVEL * sizeof(*substates));
+	if (substates == NULL) {
+	    pam_syslog(pamh, LOG_CRIT,
+		       "_pam_dispatch_aux: no memory for substack states");
+	    return PAM_BUF_ERR;
+	}
+	substates[0].impression = impression = _PAM_UNDEF;
+	substates[0].status = status = PAM_MUST_FAIL_CODE;
+    }
+
+    prev_level = 0;
+
+    /* Loop through module logic stack */
+    for (depth=0 ; h != NULL ; prev_level = stack_level, h = h->next, ++depth) {
+	int retval, cached_retval, action;
+
+        stack_level = h->stack_level;
+
+	/* skip leading modules if they have already returned */
+	if (depth < skip_depth) {
+	    continue;
+	}
+
+	/* remember state if we are entering a substack */
+	if (prev_level < stack_level) {
+	    substates[stack_level].impression = impression;
+	    substates[stack_level].status = status;
+	}
+
+	/* attempt to call the module */
+	if (h->handler_type == PAM_HT_MUST_FAIL) {
+	    D(("module poorly listed in PAM config; forcing failure"));
+	    retval = PAM_MUST_FAIL_CODE;
+	} else if (h->handler_type == PAM_HT_SUBSTACK) {
+	    D(("skipping substack handler"));
+	    continue;
+	} else if (h->func == NULL) {
+	    D(("module function is not defined, indicating failure"));
+	    retval = PAM_MODULE_UNKNOWN;
+	} else {
+	    D(("passing control to module..."));
+	    pamh->mod_name=h->mod_name;
+	    pamh->mod_argc = h->argc;
+	    pamh->mod_argv = h->argv;
+	    retval = h->func(pamh, flags, h->argc, h->argv);
+	    pamh->mod_name=NULL;
+	    pamh->mod_argc = 0;
+	    pamh->mod_argv = NULL;
+	    D(("module returned: %s", pam_strerror(pamh, retval)));
+	}
+
+	/*
+	 * PAM_INCOMPLETE return is special.  It indicates that the
+	 * module wants to wait for the application before continuing.
+	 * In order to return this, the module will have saved its
+	 * state so it can resume from an equivalent position when it
+	 * is called next time.  (This was added as of 0.65)
+	 */
+	if (retval == PAM_INCOMPLETE) {
+	    pamh->former.impression = impression;
+	    pamh->former.status = status;
+	    pamh->former.depth = depth;
+	    pamh->former.substates = substates;
+
+	    D(("module %d returned PAM_INCOMPLETE", depth));
+	    return retval;
+	}
+
+	/*
+	 * use_cached_chain is how we ensure that the setcred and
+         * close_session modules are called in the same order as they did
+	 * when they were invoked as auth/open_session. This feature was
+	 * added in 0.75 to make the behavior of pam_setcred sane.
+	 */
+	if (use_cached_chain != _PAM_PLEASE_FREEZE) {
+
+	    /* a former stack execution should have frozen the chain */
+
+	    cached_retval = *(h->cached_retval_p);
+	    if (cached_retval == _PAM_INVALID_RETVAL) {
+
+		/* This may be a problem condition. It implies that
+		   the application is running setcred, close_session,
+		   chauthtok(2nd) without having first run
+		   authenticate, open_session, chauthtok(1st)
+		   [respectively]. */
+
+		D(("use_cached_chain is set to [%d],"
+		   " but cached_retval == _PAM_INVALID_RETVAL",
+		   use_cached_chain));
+
+		/* In the case of close_session and setcred there is a
+		   backward compatibility reason for allowing this, in
+		   the chauthtok case we have encountered a bug in
+		   libpam! */
+
+		if (use_cached_chain == _PAM_MAY_BE_FROZEN) {
+		    /* (not ideal) force non-frozen stack control. */
+		    cached_retval = retval;
+		} else {
+		    D(("BUG in libpam -"
+		       " chain is required to be frozen but isn't"));
+
+		    /* cached_retval is already _PAM_INVALID_RETVAL */
+		}
+	    }
+	} else {
+	    /* this stack execution is defining the frozen chain */
+	    cached_retval = h->cached_retval = retval;
+	}
+
+	/* verify that the return value is a valid one */
+	if ((cached_retval < PAM_SUCCESS)
+	    || (cached_retval >= _PAM_RETURN_VALUES)) {
+
+	    retval = PAM_MUST_FAIL_CODE;
+	    action = _PAM_ACTION_BAD;
+	} else {
+	    /* We treat the current retval with some respect. It may
+	       (for example, in the case of setcred) have a value that
+	       needs to be propagated to the user.  We want to use the
+	       cached_retval to determine the modules to be executed
+	       in the stacked chain, but we want to treat each
+	       non-ignored module in the cached chain as now being
+	       'required'. We only need to treat the,
+	       _PAM_ACTION_IGNORE, _PAM_ACTION_IS_JUMP and
+	       _PAM_ACTION_RESET actions specially. */
+
+	    action = h->actions[cached_retval];
+	}
+
+	D(("use_cached_chain=%d action=%d cached_retval=%d retval=%d",
+	   use_cached_chain, action, cached_retval, retval));
+
+	/* decide what to do */
+	switch (action) {
+	case _PAM_ACTION_RESET:
+
+	    impression = substates[stack_level].impression;
+	    status = substates[stack_level].status;
+	    break;
+
+	case _PAM_ACTION_OK:
+	case _PAM_ACTION_DONE:
+
+	    if ( impression == _PAM_UNDEF
+		 || (impression == _PAM_POSITIVE && status == PAM_SUCCESS) ) {
+                /* in case of using cached chain
+                   we could get here with PAM_IGNORE - don't return it */
+                if ( retval != PAM_IGNORE || cached_retval == retval ) {
+		    impression = _PAM_POSITIVE;
+                    status = retval;
+                }
+	    }
+	    if ( impression == _PAM_POSITIVE ) {
+		if ( retval == PAM_SUCCESS ) {
+		    h->grantor = 1;
+		}
+
+		if ( action == _PAM_ACTION_DONE ) {
+		    goto decision_made;
+		}
+	    }
+	    break;
+
+	case _PAM_ACTION_BAD:
+	case _PAM_ACTION_DIE:
+#ifdef PAM_FAIL_NOW_ON
+	    if ( cached_retval == PAM_ABORT ) {
+		impression = _PAM_NEGATIVE;
+		status = PAM_PERM_DENIED;
+		goto decision_made;
+	    }
+#endif /* PAM_FAIL_NOW_ON */
+	    if ( impression != _PAM_NEGATIVE ) {
+		impression = _PAM_NEGATIVE;
+	        /* Don't return with PAM_IGNORE as status */
+	        if ( retval == PAM_IGNORE )
+		    status = PAM_MUST_FAIL_CODE;
+		else
+		    status = retval;
+	    }
+	    if ( action == _PAM_ACTION_DIE ) {
+		goto decision_made;
+	    }
+	    break;
+
+	case _PAM_ACTION_IGNORE:
+	    break;
+
+        /* if we get here, we expect action is a positive number --
+           this is what the ...JUMP macro checks. */
+
+	default:
+	    if ( _PAM_ACTION_IS_JUMP(action) ) {
+
+		/* If we are evaluating a cached chain, we treat this
+		   module as required (aka _PAM_ACTION_OK) as well as
+		   executing the jump. */
+
+		if (use_cached_chain) {
+		    if (impression == _PAM_UNDEF
+			|| (impression == _PAM_POSITIVE
+			    && status == PAM_SUCCESS) ) {
+			if ( retval != PAM_IGNORE || cached_retval == retval ) {
+			    if ( impression == _PAM_UNDEF && retval == PAM_SUCCESS ) {
+				h->grantor = 1;
+			    }
+			    impression = _PAM_POSITIVE;
+			    status = retval;
+			}
+		    }
+		}
+
+		/* this means that we need to skip #action stacked modules */
+		while (h->next != NULL && h->next->stack_level >= stack_level && action > 0) {
+		    do {
+			h = h->next;
+			++depth;
+		    } while (h->next != NULL && h->next->stack_level > stack_level);
+		    --action;
+		}
+
+		/* note if we try to skip too many modules action is
+                   still non-zero and we snag the next if. */
+	    }
+
+	    /* this case is a syntax error: we can't succeed */
+	    if (action) {
+		pam_syslog(pamh, LOG_ERR, "bad jump in stack");
+		impression = _PAM_NEGATIVE;
+		status = PAM_MUST_FAIL_CODE;
+	    }
+	}
+	continue;
+
+decision_made:     /* by getting  here we have made a decision */
+	while (h->next != NULL && h->next->stack_level >= stack_level) {
+	    h = h->next;
+	    ++depth;
+	}
+    }
+
+    /* Sanity check */
+    if ( status == PAM_SUCCESS && impression != _PAM_POSITIVE ) {
+	D(("caught on sanity check -- this is probably a config error!"));
+	status = PAM_MUST_FAIL_CODE;
+    }
+
+    free(substates);
+    /* We have made a decision about the modules executed */
+    return status;
+}
+
+static void _pam_clear_grantors(struct handler *h)
+{
+    for (; h != NULL; h = h->next) {
+	h->grantor = 0;
+    }
+}
+
+/*
+ * This function translates the module dispatch request into a pointer
+ * to the stack of modules that will actually be run.  the
+ * _pam_dispatch_aux() function (above) is responsible for walking the
+ * module stack.
+ */
+
+int _pam_dispatch(pam_handle_t *pamh, int flags, int choice)
+{
+    struct handler *h = NULL;
+    int retval = PAM_SYSTEM_ERR, use_cached_chain;
+    _pam_boolean resumed;
+
+    IF_NO_PAMH("_pam_dispatch", pamh, PAM_SYSTEM_ERR);
+
+    if (__PAM_FROM_MODULE(pamh)) {
+	D(("called from a module!?"));
+	goto end;
+    }
+
+    /* Load all modules, resolve all symbols */
+
+    if ((retval = _pam_init_handlers(pamh)) != PAM_SUCCESS) {
+	pam_syslog(pamh, LOG_ERR, "unable to dispatch function");
+	goto end;
+    }
+
+    use_cached_chain = _PAM_PLEASE_FREEZE;
+
+    switch (choice) {
+    case PAM_AUTHENTICATE:
+	h = pamh->handlers.conf.authenticate;
+	break;
+    case PAM_SETCRED:
+	h = pamh->handlers.conf.setcred;
+	use_cached_chain = _PAM_MAY_BE_FROZEN;
+	break;
+    case PAM_ACCOUNT:
+	h = pamh->handlers.conf.acct_mgmt;
+	break;
+    case PAM_OPEN_SESSION:
+	h = pamh->handlers.conf.open_session;
+	break;
+    case PAM_CLOSE_SESSION:
+	h = pamh->handlers.conf.close_session;
+	use_cached_chain = _PAM_MAY_BE_FROZEN;
+	break;
+    case PAM_CHAUTHTOK:
+	h = pamh->handlers.conf.chauthtok;
+	break;
+    default:
+	pam_syslog(pamh, LOG_ERR, "undefined fn choice; %d", choice);
+	retval = PAM_ABORT;
+	goto end;
+    }
+
+    if (h == NULL) {     /* there was no handlers.conf... entry; will use
+			  * handlers.other... */
+	switch (choice) {
+	case PAM_AUTHENTICATE:
+	    h = pamh->handlers.other.authenticate;
+	    break;
+	case PAM_SETCRED:
+	    h = pamh->handlers.other.setcred;
+	    break;
+	case PAM_ACCOUNT:
+	    h = pamh->handlers.other.acct_mgmt;
+	    break;
+	case PAM_OPEN_SESSION:
+	    h = pamh->handlers.other.open_session;
+	    break;
+	case PAM_CLOSE_SESSION:
+	    h = pamh->handlers.other.close_session;
+	    break;
+	case PAM_CHAUTHTOK:
+	    h = pamh->handlers.other.chauthtok;
+	    break;
+	}
+    }
+
+    /* Did a module return an "incomplete state" last time? */
+    if (pamh->former.choice != PAM_NOT_STACKED) {
+	if (pamh->former.choice != choice) {
+	    pam_syslog(pamh, LOG_ERR,
+			    "application failed to re-exec stack [%d:%d]",
+			    pamh->former.choice, choice);
+	    retval = PAM_ABORT;
+	    goto end;
+	}
+	resumed = PAM_TRUE;
+    } else {
+	resumed = PAM_FALSE;
+	_pam_clear_grantors(h);
+    }
+
+    __PAM_TO_MODULE(pamh);
+
+    /* call the list of module functions */
+    pamh->choice = choice;
+    retval = _pam_dispatch_aux(pamh, flags, h, resumed, use_cached_chain);
+
+    __PAM_TO_APP(pamh);
+
+    /* Should we recall where to resume next time? */
+    if (retval == PAM_INCOMPLETE) {
+	D(("module [%d] returned PAM_INCOMPLETE"));
+	pamh->former.choice = choice;
+    } else {
+	pamh->former.choice = PAM_NOT_STACKED;
+    }
+
+end:
+
+#ifdef HAVE_LIBAUDIT
+    if (choice != PAM_CHAUTHTOK || flags & PAM_UPDATE_AUTHTOK || retval != PAM_SUCCESS) {
+	retval = _pam_auditlog(pamh, choice, retval, flags, h);
+    }
+#endif
+
+    return retval;
+}
diff --git a/libpam/pam_dynamic.c b/libpam/pam_dynamic.c
new file mode 100644
index 0000000..c063083
--- /dev/null
+++ b/libpam/pam_dynamic.c
@@ -0,0 +1,138 @@
+/*
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "pam_private.h"
+
+#ifdef PAM_SHL
+# include <dl.h>
+#elif defined(PAM_DYLD)
+# include <mach-o/dyld.h>
+#else /* PAM_SHL */
+# include <dlfcn.h>
+#endif /* PAM_SHL */
+
+#ifndef SHLIB_SYM_PREFIX
+#define SHLIB_SYM_PREFIX "_"
+#endif
+
+void *_pam_dlopen(const char *mod_path)
+{
+#ifdef PAM_SHL
+	return shl_load(mod_path, BIND_IMMEDIATE, 0L);
+#elif defined(PAM_DYLD)
+	NSObjectFileImage ofile;
+	void *ret = NULL;
+
+	if (NSCreateObjectFileImageFromFile(mod_path, &ofile) !=
+			NSObjectFileImageSuccess )
+		return NULL;
+
+	ret = NSLinkModule(ofile, mod_path, NSLINKMODULE_OPTION_PRIVATE | NSLINKMODULE_OPTION_BINDNOW);
+	NSDestroyObjectFileImage(ofile);
+
+	return ret;
+#else
+	return dlopen(mod_path, RTLD_NOW);
+#endif
+}
+
+servicefn _pam_dlsym(void *handle, const char *symbol)
+{
+#ifdef PAM_SHL
+	char *_symbol = NULL;
+	servicefn ret;
+
+	if( symbol == NULL )
+		return NULL;
+
+	if( shl_findsym(&handle, symbol, (short) TYPE_PROCEDURE, &ret ){
+		_symbol = malloc( strlen(symbol) + sizeof(SHLIB_SYM_PREFIX) + 1 );
+		if( _symbol == NULL )
+			return NULL;
+		strcpy(_symbol, SHLIB_SYM_PREFIX);
+		strcat(_symbol, symbol);
+		if( shl_findsym(&handle, _symbol,
+				(short) TYPE_PROCEDURE, &ret ){
+			free(_symbol);
+			return NULL;
+		}
+		free(_symbol);
+	}
+
+	return ret;
+
+#elif defined(PAM_DYLD)
+	NSSymbol nsSymbol;
+	char *_symbol;
+
+	if( symbol == NULL )
+		return NULL;
+	_symbol = malloc( strlen(symbol) + 2 );
+	if( _symbol == NULL )
+		return NULL;
+	strcpy(_symbol, SHLIB_SYM_PREFIX);
+	strcat(_symbol, symbol);
+
+	nsSymbol = NSLookupSymbolInModule(handle, _symbol);
+	if( nsSymbol == NULL )
+		return NULL;
+	free(_symbol);
+
+	return (servicefn)NSAddressOfSymbol(nsSymbol);
+#else
+	return (servicefn) dlsym(handle, symbol);
+#endif
+}
+
+void _pam_dlclose(void *handle)
+{
+#ifdef PAM_SHL
+	shl_unload(handle);
+#elif defined(PAM_DYLD)
+	NSUnLinkModule((NSModule)handle, NSUNLINKMODULE_OPTION_NONE);
+#else
+	dlclose(handle);
+#endif
+
+	return;
+}
+
+const char *
+_pam_dlerror (void)
+{
+#if defined(PAM_SHL) || defined(PAM_DYLD)
+        return "unknown";
+#else
+        return dlerror ();
+#endif
+}
diff --git a/libpam/pam_end.c b/libpam/pam_end.c
new file mode 100644
index 0000000..406b147
--- /dev/null
+++ b/libpam/pam_end.c
@@ -0,0 +1,98 @@
+/* pam_end.c */
+
+/*
+ * $Id$
+ */
+
+#include "pam_private.h"
+
+#include <stdlib.h>
+
+int pam_end(pam_handle_t *pamh, int pam_status)
+{
+    int ret;
+
+    D(("entering pam_end()"));
+
+    IF_NO_PAMH("pam_end", pamh, PAM_SYSTEM_ERR);
+
+    if (__PAM_FROM_MODULE(pamh)) {
+	D(("called from module!?"));
+	return PAM_SYSTEM_ERR;
+    }
+
+#ifdef HAVE_LIBAUDIT
+    _pam_audit_end(pamh, pam_status);
+#endif
+
+    /* first liberate the modules (it is not inconcevible that the
+       modules may need to use the service_name etc. to clean up) */
+
+    _pam_free_data(pamh, pam_status);
+
+    /* now drop all modules */
+
+    if ((ret = _pam_free_handlers(pamh)) != PAM_SUCCESS) {
+	return ret;                 /* error occurred */
+    }
+
+    /* from this point we cannot call the modules any more. Free the remaining
+       memory used by the Linux-PAM interface */
+
+    _pam_drop_env(pamh);                      /* purge the environment */
+
+    _pam_overwrite(pamh->authtok);            /* blank out old token */
+    _pam_drop(pamh->authtok);
+
+    _pam_overwrite(pamh->oldauthtok);         /* blank out old token */
+    _pam_drop(pamh->oldauthtok);
+
+    _pam_overwrite(pamh->former.prompt);
+    _pam_drop(pamh->former.prompt);           /* drop saved prompt */
+
+    _pam_overwrite(pamh->service_name);
+    _pam_drop(pamh->service_name);
+
+    _pam_overwrite(pamh->user);
+    _pam_drop(pamh->user);
+
+    _pam_overwrite(pamh->confdir);
+    _pam_drop(pamh->confdir);
+
+    _pam_overwrite(pamh->prompt);
+    _pam_drop(pamh->prompt);                  /* prompt for pam_get_user() */
+
+    _pam_overwrite(pamh->tty);
+    _pam_drop(pamh->tty);
+
+    _pam_overwrite(pamh->rhost);
+    _pam_drop(pamh->rhost);
+
+    _pam_overwrite(pamh->ruser);
+    _pam_drop(pamh->ruser);
+
+    _pam_drop(pamh->pam_conversation);
+    pamh->fail_delay.delay_fn_ptr = NULL;
+
+    _pam_drop(pamh->former.substates);
+
+    _pam_overwrite(pamh->xdisplay);
+    _pam_drop(pamh->xdisplay);
+
+    _pam_overwrite(pamh->xauth.name);
+    _pam_drop(pamh->xauth.name);
+    _pam_overwrite_n(pamh->xauth.data, (unsigned int)pamh->xauth.datalen);
+    _pam_drop(pamh->xauth.data);
+    _pam_overwrite_n((char *)&pamh->xauth, sizeof(pamh->xauth));
+
+    _pam_overwrite(pamh->authtok_type);
+    _pam_drop(pamh->authtok_type);
+
+    /* and finally liberate the memory for the pam_handle structure */
+
+    _pam_drop(pamh);
+
+    D(("exiting pam_end() successfully"));
+
+    return PAM_SUCCESS;
+}
diff --git a/libpam/pam_env.c b/libpam/pam_env.c
new file mode 100644
index 0000000..1c8403d
--- /dev/null
+++ b/libpam/pam_env.c
@@ -0,0 +1,392 @@
+/*
+ * pam_env.c
+ *
+ * Copyright (c) Andrew G. Morgan <morgan@parc.power.net> 1996,1997
+ * All rights reserved.
+ *
+ * This file was written from a "hint" provided by the people at SUN.
+ * and the X/Open XSSO draft of March 1997.
+ *
+ * $Id$
+ */
+
+#include "pam_private.h"
+
+#include <string.h>
+#include <stdlib.h>
+
+#ifdef sunos
+#define memmove(x,y,z) bcopy(y,x,z)
+#endif
+
+/* helper functions */
+
+#ifdef PAM_DEBUG
+static void _pam_dump_env(pam_handle_t *pamh)
+{
+    int i;
+
+    D(("Listing environment of pamh=%p", pamh));
+    D(("pamh->env = %p", pamh->env));
+    D(("environment entries used = %d [of %d allocated]"
+       , pamh->env->requested, pamh->env->entries));
+
+    for (i=0; i<pamh->env->requested; ++i) {
+	_pam_output_debug(">%-3d [%9p]:[%s]"
+			  , i, pamh->env->list[i], pamh->env->list[i]);
+    }
+    _pam_output_debug("*NOTE* the last item should be (nil)");
+}
+#else
+#define _pam_dump_env(x)
+#endif
+
+/*
+ * Create the environment
+ */
+
+int _pam_make_env(pam_handle_t *pamh)
+{
+    D(("called."));
+
+    IF_NO_PAMH("_pam_make_env", pamh, PAM_ABORT);
+
+    /*
+     * get structure memory
+     */
+
+    pamh->env = (struct pam_environ *) malloc(sizeof(struct pam_environ));
+    if (pamh->env == NULL) {
+	pam_syslog(pamh, LOG_CRIT, "_pam_make_env: out of memory");
+	return PAM_BUF_ERR;
+    }
+
+    /*
+     * get list memory
+     */
+
+    pamh->env->list = (char **)calloc( PAM_ENV_CHUNK, sizeof(char *) );
+    if (pamh->env->list == NULL) {
+	pam_syslog(pamh, LOG_CRIT, "_pam_make_env: no memory for list");
+	_pam_drop(pamh->env);
+	return PAM_BUF_ERR;
+    }
+
+    /*
+     * fill entries in pamh->env
+     */
+
+    pamh->env->entries = PAM_ENV_CHUNK;
+    pamh->env->requested = 1;
+    pamh->env->list[0] = NULL;
+
+    _pam_dump_env(pamh);                    /* only active when debugging */
+
+    return PAM_SUCCESS;
+}
+
+/*
+ * purge the environment
+ */
+
+void _pam_drop_env(pam_handle_t *pamh)
+{
+    D(("called."));
+    IF_NO_PAMH("_pam_make_env", pamh, /* nothing to return */);
+
+    if (pamh->env != NULL) {
+	int i;
+	/* we will only purge the pamh->env->requested number of elements */
+
+	for (i=pamh->env->requested-1; i-- > 0; ) {
+	    D(("dropping #%3d>%s<", i, pamh->env->list[i]));
+	    _pam_overwrite(pamh->env->list[i]);          /* clean */
+	    _pam_drop(pamh->env->list[i]);              /* forget */
+	}
+	pamh->env->requested = 0;
+	pamh->env->entries = 0;
+	_pam_drop(pamh->env->list);                     /* forget */
+	_pam_drop(pamh->env);                           /* forget */
+    } else {
+	D(("no environment present in pamh?"));
+    }
+}
+
+/*
+ * Return the item number of the given variable = first 'length' chars
+ * of 'name_value'. Since this is a static function, it is safe to
+ * assume its supplied arguments are well defined.
+ */
+
+static int _pam_search_env(const struct pam_environ *env
+			   , const char *name_value, int length)
+{
+    int i;
+
+    for (i=env->requested-1; i-- > 0; ) {
+	if (strncmp(name_value,env->list[i],length) == 0
+	    && env->list[i][length] == '=') {
+
+	    return i;                                   /* Got it! */
+
+	}
+    }
+
+    return -1;                                          /* no luck */
+}
+
+/*
+ * externally visible functions
+ */
+
+/*
+ *  pam_putenv(): Add/replace/delete a PAM-environment variable.
+ *
+ *  Add/replace:
+ *      name_value = "NAME=VALUE" or "NAME=" (for empty value="\0")
+ *
+ *  delete:
+ *      name_value = "NAME"
+ */
+
+int pam_putenv(pam_handle_t *pamh, const char *name_value)
+{
+    int l2eq, item, retval;
+
+    D(("called."));
+    IF_NO_PAMH("pam_putenv", pamh, PAM_ABORT);
+
+    if (name_value == NULL) {
+	pam_syslog(pamh, LOG_ERR, "pam_putenv: no variable indicated");
+	return PAM_PERM_DENIED;
+    }
+
+    /*
+     * establish if we are setting or deleting; scan for '='
+     */
+
+    for (l2eq=0; name_value[l2eq] && name_value[l2eq] != '='; ++l2eq);
+    if (l2eq <= 0) {
+	pam_syslog(pamh, LOG_ERR, "pam_putenv: bad variable");
+	return PAM_BAD_ITEM;
+    }
+
+    /*
+     *  Look first for environment.
+     */
+
+    if (pamh->env == NULL || pamh->env->list == NULL) {
+	pam_syslog(pamh, LOG_ERR, "pam_putenv: no env%s found",
+		       pamh->env == NULL ? "":"-list");
+	return PAM_ABORT;
+    }
+
+    /* find the item to replace */
+
+    item = _pam_search_env(pamh->env, name_value, l2eq);
+
+    if (name_value[l2eq]) {                     /* (re)setting */
+
+	if (item == -1) {                      /* new variable */
+	    D(("adding item: %s", name_value));
+	    /* enough space? */
+	    if (pamh->env->entries <= pamh->env->requested) {
+		register int i;
+		register char **tmp;
+
+		/* get some new space */
+		tmp = calloc( pamh->env->entries + PAM_ENV_CHUNK
+				     , sizeof(char *) );
+		if (tmp == NULL) {
+		    /* nothing has changed - old env intact */
+		    pam_syslog(pamh, LOG_CRIT,
+			       "pam_putenv: cannot grow environment");
+		    return PAM_BUF_ERR;
+		}
+
+		/* copy old env-item pointers/forget old */
+		for (i=0; i<pamh->env->requested; ++i) {
+		    tmp[i] = pamh->env->list[i];
+		    pamh->env->list[i] = NULL;
+		}
+
+		/* drop old list and replace with new */
+		_pam_drop(pamh->env->list);
+		pamh->env->list = tmp;
+		pamh->env->entries += PAM_ENV_CHUNK;
+
+		D(("resized env list"));
+		_pam_dump_env(pamh);              /* only when debugging */
+	    }
+
+	    item = pamh->env->requested-1;        /* old last item (NULL) */
+
+	    /* add a new NULL entry at end; increase counter */
+	    pamh->env->list[pamh->env->requested++] = NULL;
+
+	} else {                                /* replace old */
+	    D(("replacing item: %s\n          with: %s"
+	       , pamh->env->list[item], name_value));
+	    _pam_overwrite(pamh->env->list[item]);
+	    _pam_drop(pamh->env->list[item]);
+	}
+
+	/*
+	 * now we have a place to put the new env-item, insert at 'item'
+	 */
+
+	pamh->env->list[item] = _pam_strdup(name_value);
+	if (pamh->env->list[item] != NULL) {
+	    _pam_dump_env(pamh);                   /* only when debugging */
+	    return PAM_SUCCESS;
+	}
+
+	/* something went wrong; we should delete the item - fall through */
+
+	retval = PAM_BUF_ERR;                        /* an error occurred */
+    } else {
+	retval = PAM_SUCCESS;                      /* we requested delete */
+    }
+
+    /* getting to here implies we are deleting an item */
+
+    if (item < 0) {
+	pam_syslog(pamh, LOG_ERR,
+		   "pam_putenv: delete non-existent entry; %s", name_value);
+	return PAM_BAD_ITEM;
+    }
+
+    /*
+     * remove item: purge memory; reset counter; resize [; display-env]
+     */
+
+    D(("deleting: env#%3d:[%s]", item, pamh->env->list[item]));
+    _pam_overwrite(pamh->env->list[item]);
+    _pam_drop(pamh->env->list[item]);
+    --(pamh->env->requested);
+    D(("mmove: item[%d]+%d -> item[%d]"
+       , item+1, ( pamh->env->requested - item ), item));
+    (void) memmove(&pamh->env->list[item], &pamh->env->list[item+1]
+		   , ( pamh->env->requested - item )*sizeof(char *) );
+
+    _pam_dump_env(pamh);                   /* only when debugging */
+
+    /*
+     * deleted.
+     */
+
+    return retval;
+}
+
+/*
+ *  Return the value of the requested environment variable
+ */
+
+const char *pam_getenv(pam_handle_t *pamh, const char *name)
+{
+    int item;
+
+    D(("called."));
+    IF_NO_PAMH("pam_getenv", pamh, NULL);
+
+    if (name == NULL) {
+	pam_syslog(pamh, LOG_ERR, "pam_getenv: no variable indicated");
+	return NULL;
+    }
+
+    if (pamh->env == NULL || pamh->env->list == NULL) {
+	pam_syslog(pamh, LOG_ERR, "pam_getenv: no env%s found",
+		   pamh->env == NULL ? "":"-list" );
+	return NULL;
+    }
+
+    /* find the requested item */
+
+    item = _pam_search_env(pamh->env, name, strlen(name));
+    if (item != -1) {
+
+	D(("env-item: %s, found!", name));
+	return (pamh->env->list[item] + 1 + strlen(name));
+
+    } else {
+
+	D(("env-item: %s, not found", name));
+	return NULL;
+
+    }
+}
+
+static char **_copy_env(pam_handle_t *pamh)
+{
+    char **dump;
+    int i = pamh->env->requested;          /* reckon size of environment */
+    char *const *env = pamh->env->list;
+
+    D(("now get some memory for dump"));
+
+    /* allocate some memory for this (plus the null tail-pointer) */
+    dump = (char **) calloc(i, sizeof(char *));
+    D(("dump = %p", dump));
+    if (dump == NULL) {
+	return NULL;
+    }
+
+    /* now run through entries and copy the variables over */
+    dump[--i] = NULL;
+    while (i-- > 0) {
+	D(("env[%d]=`%s'", i,env[i]));
+	dump[i] = _pam_strdup(env[i]);
+	D(("->dump[%d]=`%s'", i,dump[i]));
+	if (dump[i] == NULL) {
+	    /* out of memory */
+
+	    while (dump[++i]) {
+		_pam_overwrite(dump[i]);
+		_pam_drop(dump[i]);
+	    }
+	    _pam_drop(dump);
+	    return NULL;
+	}
+    }
+
+    env = NULL;                             /* forget now */
+
+    /* return transcribed environment */
+    return dump;
+}
+
+char **pam_getenvlist(pam_handle_t *pamh)
+{
+    int i;
+
+    D(("called."));
+    IF_NO_PAMH("pam_getenvlist", pamh, NULL);
+
+    if (pamh->env == NULL || pamh->env->list == NULL) {
+	pam_syslog(pamh, LOG_ERR, "pam_getenvlist: no env%s found",
+		   pamh->env == NULL ? "":"-list" );
+	return NULL;
+    }
+
+    /* some quick checks */
+
+    if (pamh->env->requested > pamh->env->entries) {
+	pam_syslog(pamh, LOG_ERR, "pam_getenvlist: environment corruption");
+	_pam_dump_env(pamh);                 /* only active when debugging */
+	return NULL;
+    }
+
+    for (i=pamh->env->requested-1; i-- > 0; ) {
+	if (pamh->env->list[i] == NULL) {
+	    pam_syslog(pamh, LOG_ERR, "pam_getenvlist: environment broken");
+	    _pam_dump_env(pamh);              /* only active when debugging */
+	    return NULL;          /* somehow we've broken the environment!? */
+	}
+    }
+
+    /* Seems fine; copy environment */
+
+    _pam_dump_env(pamh);                    /* only active when debugging */
+
+    return _copy_env(pamh);
+}
diff --git a/libpam/pam_get_authtok.c b/libpam/pam_get_authtok.c
new file mode 100644
index 0000000..3fa7f7d
--- /dev/null
+++ b/libpam/pam_get_authtok.c
@@ -0,0 +1,280 @@
+/*
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "pam_private.h"
+
+#include <security/pam_ext.h>
+
+#define PROMPT _("Password: ")
+/* For Translators: "%s" is replaced with "<service>". */
+#define PROMPT_CURRENT_ARG _("Current %s password: ")
+#define PROMPT_CURRENT_NOARG _("Current password: ")
+/* For Translators: "%s" is replaced with "<service>". */
+#define PROMPT_NEW_ARG _("New %s password: ")
+#define PROMPT_NEW_NOARG _("New password: ")
+/* For Translators: "%s" is replaced with "<service>". */
+#define PROMPT_RETYPE_ARG _("Retype new %s password: ")
+#define PROMPT_RETYPE_NOARG _("Retype new password: ")
+#define MISTYPED_PASS _("Sorry, passwords do not match.")
+
+#define PAM_GETAUTHTOK_NOVERIFY  1
+
+static const char *
+get_option (pam_handle_t *pamh, const char *option)
+{
+  int i;
+  size_t len;
+
+
+  if (option == NULL || pamh == NULL ||
+      pamh->mod_argc == 0 || pamh->mod_argv == NULL)
+    return NULL;
+
+  len = strlen (option);
+
+  for (i = 0; i < pamh->mod_argc; i++)
+    {
+      if (strncmp (option, pamh->mod_argv[i], len) == 0)
+        {
+          if (pamh->mod_argv[i][len] == '=')
+            return &(pamh->mod_argv[i][len+1]);
+          else if (pamh->mod_argv[i][len] == '\0')
+            return "";
+        }
+    }
+  return NULL;
+}
+
+
+static int
+pam_get_authtok_internal (pam_handle_t *pamh, int item,
+			  const char **authtok, const char *prompt,
+			  unsigned int flags)
+
+{
+  char *resp[2] = {NULL, NULL};
+  const void *prevauthtok;
+  const char *authtok_type = "";
+  int chpass = 0; /* Password change, ask twice for it */
+  int retval;
+
+  if (authtok == NULL)
+    return PAM_SYSTEM_ERR;
+
+  /* PAM_AUTHTOK in password stack returns new password,
+     which needs to be verified. */
+  if (pamh->choice == PAM_CHAUTHTOK)
+    {
+      if (item == PAM_AUTHTOK)
+	{
+	  chpass = 1;
+	  if (!(flags & PAM_GETAUTHTOK_NOVERIFY))
+	    ++chpass;
+	}
+      authtok_type = get_option (pamh, "authtok_type");
+      if (authtok_type == NULL)
+	{
+	  retval = pam_get_item (pamh, PAM_AUTHTOK_TYPE, (const void **)&authtok_type);
+	  if (retval != PAM_SUCCESS || authtok_type == NULL)
+	    authtok_type = "";
+	}
+      else
+        pam_set_item(pamh, PAM_AUTHTOK_TYPE, authtok_type);
+    }
+
+  retval = pam_get_item (pamh, item, &prevauthtok);
+  if (retval == PAM_SUCCESS && prevauthtok != NULL)
+    {
+      *authtok = prevauthtok;
+      return PAM_SUCCESS;
+    }
+  else if (get_option (pamh, "use_first_pass") ||
+	   (chpass && get_option (pamh, "use_authtok")))
+    {
+      if (prevauthtok == NULL)
+	{
+	  if (chpass)
+	    return PAM_AUTHTOK_ERR;
+	  else
+	    return PAM_AUTH_ERR;
+	}
+      else
+	return retval;
+    }
+
+  if (prompt != NULL)
+    {
+      retval = pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp[0],
+			   "%s", prompt);
+      if (retval == PAM_SUCCESS && chpass > 1 && resp[0] != NULL)
+	retval = pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp[1],
+			     _("Retype %s"), prompt);
+    }
+  else if (chpass)
+    {
+      pamh->authtok_verified = 0;
+
+      retval = *authtok_type ?
+	pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp[0],
+		    PROMPT_NEW_ARG, authtok_type) :
+	pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp[0],
+		    "%s", PROMPT_NEW_NOARG);
+      if (retval == PAM_SUCCESS && chpass > 1 && resp[0] != NULL)
+	{
+	  retval = *authtok_type ?
+	    pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp[1],
+			PROMPT_RETYPE_ARG, authtok_type) :
+	    pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp[1],
+			"%s", PROMPT_RETYPE_NOARG);
+	}
+    }
+  else if (item == PAM_OLDAUTHTOK)
+    {
+      retval = *authtok_type ?
+	pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp[0],
+		    PROMPT_CURRENT_ARG, authtok_type) :
+	pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp[0],
+		    "%s", PROMPT_CURRENT_NOARG);
+    }
+  else
+    retval = pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp[0], "%s", PROMPT);
+
+  if (retval != PAM_SUCCESS || resp[0] == NULL ||
+      (chpass > 1 && resp[1] == NULL))
+    {
+      /* We want to abort */
+      if (chpass)
+        pam_error (pamh, _("Password change has been aborted."));
+      return PAM_AUTHTOK_ERR;
+    }
+
+  if (chpass > 1 && strcmp (resp[0], resp[1]) != 0)
+    {
+      pam_error (pamh, MISTYPED_PASS);
+      _pam_overwrite (resp[0]);
+      _pam_drop (resp[0]);
+      _pam_overwrite (resp[1]);
+      _pam_drop (resp[1]);
+      return PAM_TRY_AGAIN;
+    }
+
+  _pam_overwrite (resp[1]);
+  _pam_drop (resp[1]);
+
+  retval = pam_set_item (pamh, item, resp[0]);
+  _pam_overwrite (resp[0]);
+  _pam_drop (resp[0]);
+  if (retval != PAM_SUCCESS)
+    return retval;
+
+  if (chpass > 1)
+    pamh->authtok_verified = 1;
+
+  return pam_get_item(pamh, item, (const void **)authtok);
+}
+
+int
+pam_get_authtok (pam_handle_t *pamh, int item, const char **authtok,
+		 const char *prompt)
+{
+  return pam_get_authtok_internal (pamh, item, authtok, prompt, 0);
+}
+
+
+int
+pam_get_authtok_noverify (pam_handle_t *pamh, const char **authtok,
+			  const char *prompt)
+{
+  return pam_get_authtok_internal (pamh, PAM_AUTHTOK, authtok, prompt,
+				   PAM_GETAUTHTOK_NOVERIFY);
+}
+
+int
+pam_get_authtok_verify (pam_handle_t *pamh, const char **authtok,
+			const char *prompt)
+{
+  char *resp = NULL;
+  const char *authtok_type = "";
+  int retval;
+
+  if (authtok == NULL || pamh->choice != PAM_CHAUTHTOK)
+    return PAM_SYSTEM_ERR;
+
+  if (pamh->authtok_verified)
+    return pam_get_item (pamh, PAM_AUTHTOK, (const void **)authtok);
+
+  if (prompt != NULL)
+    {
+      retval = pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp,
+			   _("Retype %s"), prompt);
+    }
+  else
+    {
+      retval = pam_get_item (pamh, PAM_AUTHTOK_TYPE, (const void **)&authtok_type);
+      if (retval != PAM_SUCCESS || authtok_type == NULL)
+        authtok_type = "";
+      retval = *authtok_type ?
+	pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp,
+		    PROMPT_RETYPE_ARG, authtok_type) :
+	pam_prompt (pamh, PAM_PROMPT_ECHO_OFF, &resp,
+		    "%s", PROMPT_RETYPE_NOARG);
+    }
+
+  if (retval != PAM_SUCCESS || resp == NULL)
+    {
+      /* We want to abort the password change */
+      pam_set_item (pamh, PAM_AUTHTOK, NULL);
+      pam_error (pamh, _("Password change has been aborted."));
+      return PAM_AUTHTOK_ERR;
+    }
+
+  if (strcmp (*authtok, resp) != 0)
+    {
+      pam_set_item (pamh, PAM_AUTHTOK, NULL);
+      pam_error (pamh, MISTYPED_PASS);
+      _pam_overwrite (resp);
+      _pam_drop (resp);
+      return PAM_TRY_AGAIN;
+    }
+
+  retval = pam_set_item (pamh, PAM_AUTHTOK, resp);
+  _pam_overwrite (resp);
+  _pam_drop (resp);
+  if (retval != PAM_SUCCESS)
+    return retval;
+
+  pamh->authtok_verified = 1;
+
+  return pam_get_item(pamh, PAM_AUTHTOK, (const void **)authtok);
+}
diff --git a/libpam/pam_handlers.c b/libpam/pam_handlers.c
new file mode 100644
index 0000000..ffa5e4a
--- /dev/null
+++ b/libpam/pam_handlers.c
@@ -0,0 +1,1045 @@
+/* pam_handlers.c -- pam config file parsing and module loading */
+
+/*
+ * created by Marc Ewing.
+ * Currently maintained by Andrew G. Morgan <morgan@kernel.org>
+ *
+ */
+
+#include "pam_private.h"
+#include "pam_inline.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#define BUF_SIZE                  1024
+#define MODULE_CHUNK              4
+#define UNKNOWN_MODULE       "<*unknown module*>"
+#ifndef _PAM_ISA
+#define _PAM_ISA "."
+#endif
+
+static int _pam_assemble_line(FILE *f, char *buf, int buf_len);
+
+static void _pam_free_handlers_aux(struct handler **hp);
+
+static int _pam_add_handler(pam_handle_t *pamh
+		     , int must_fail, int other, int stack_level, int type
+		     , int *actions, const char *mod_path
+		     , int argc, char **argv, int argvlen);
+
+/* Values for module type */
+
+#define PAM_T_ANY     0
+#define PAM_T_AUTH    1
+#define PAM_T_SESS    2
+#define PAM_T_ACCT    4
+#define PAM_T_PASS    8
+
+static int _pam_load_conf_file(pam_handle_t *pamh, const char *config_name
+				, const char *service /* specific file */
+				, int module_type /* specific type */
+				, int stack_level /* level of substack */
+#ifdef PAM_READ_BOTH_CONFS
+				, int not_other
+#endif /* PAM_READ_BOTH_CONFS */
+    );
+
+static int _pam_parse_conf_file(pam_handle_t *pamh, FILE *f
+				, const char *known_service /* specific file */
+				, int requested_module_type /* specific type */
+				, int stack_level /* level of substack */
+#ifdef PAM_READ_BOTH_CONFS
+				, int not_other
+#endif /* PAM_READ_BOTH_CONFS */
+    )
+{
+    char buf[BUF_SIZE];
+    int x;                    /* read a line from the FILE *f ? */
+    /*
+     * read a line from the configuration (FILE *) f
+     */
+    while ((x = _pam_assemble_line(f, buf, BUF_SIZE)) > 0) {
+	char *tok, *nexttok=NULL;
+	const char *this_service;
+	const char *mod_path;
+	int module_type, actions[_PAM_RETURN_VALUES];
+	int other;            /* set if module is for PAM_DEFAULT_SERVICE */
+	int res;              /* module added successfully? */
+	int handler_type = PAM_HT_MODULE; /* regular handler from a module */
+	int argc;
+	char **argv;
+	int argvlen;
+
+	D(("_pam_init_handler: LINE: %s", buf));
+	if (known_service != NULL) {
+	    nexttok = buf;
+	    /* No service field: all lines are for the known service. */
+	    this_service = known_service;
+	} else {
+	    this_service = tok = _pam_StrTok(buf, " \n\t", &nexttok);
+	}
+
+#ifdef PAM_READ_BOTH_CONFS
+	if (not_other)
+	    other = 0;
+	else
+#endif /* PAM_READ_BOTH_CONFS */
+	other = !strcasecmp(this_service, PAM_DEFAULT_SERVICE);
+
+	/* accept "service name" or PAM_DEFAULT_SERVICE modules */
+	if (!strcasecmp(this_service, pamh->service_name) || other) {
+	    int pam_include = 0;
+	    int substack = 0;
+
+	    /* This is a service we are looking for */
+	    D(("_pam_init_handlers: Found PAM config entry for: %s"
+	       , this_service));
+
+	    tok = _pam_StrTok(NULL, " \n\t", &nexttok);
+	    if (tok == NULL) {
+	        /* module type does not exist */
+	        D(("_pam_init_handlers: empty module type for %s", this_service));
+	        pam_syslog(pamh, LOG_ERR,
+			   "(%s) empty module type", this_service);
+	        module_type = (requested_module_type != PAM_T_ANY) ?
+		  requested_module_type : PAM_T_AUTH;	/* most sensitive */
+	        handler_type = PAM_HT_MUST_FAIL; /* install as normal but fail when dispatched */
+	    } else {
+		if (tok[0] == '-') { /* do not log module load errors */
+		    handler_type = PAM_HT_SILENT_MODULE;
+		    ++tok;
+		}
+		if (!strcasecmp("auth", tok)) {
+		    module_type = PAM_T_AUTH;
+		} else if (!strcasecmp("session", tok)) {
+		    module_type = PAM_T_SESS;
+		} else if (!strcasecmp("account", tok)) {
+		    module_type = PAM_T_ACCT;
+		} else if (!strcasecmp("password", tok)) {
+		    module_type = PAM_T_PASS;
+		} else {
+		    /* Illegal module type */
+		    D(("_pam_init_handlers: bad module type: %s", tok));
+		    pam_syslog(pamh, LOG_ERR, "(%s) illegal module type: %s",
+			    this_service, tok);
+		    module_type = (requested_module_type != PAM_T_ANY) ?
+			    requested_module_type : PAM_T_AUTH;	/* most sensitive */
+		    handler_type = PAM_HT_MUST_FAIL; /* install as normal but fail when dispatched */
+		}
+	    }
+	    D(("Using %s config entry: %s", handler_type?"BAD ":"", tok));
+	    if (requested_module_type != PAM_T_ANY &&
+	        module_type != requested_module_type) {
+		D(("Skipping config entry: %s (requested=%d, found=%d)",
+		   tok, requested_module_type, module_type));
+		continue;
+	    }
+
+	    /* reset the actions to .._UNDEF's -- this is so that
+               we can work out which entries are not yet set (for default). */
+	    {
+		int i;
+		for (i=0; i<_PAM_RETURN_VALUES;
+		     actions[i++] = _PAM_ACTION_UNDEF);
+	    }
+	    tok = _pam_StrTok(NULL, " \n\t", &nexttok);
+	    if (tok == NULL) {
+		/* no module name given */
+		D(("_pam_init_handlers: no control flag supplied"));
+		pam_syslog(pamh, LOG_ERR,
+			   "(%s) no control flag supplied", this_service);
+		_pam_set_default_control(actions, _PAM_ACTION_BAD);
+		handler_type = PAM_HT_MUST_FAIL;
+	    } else if (!strcasecmp("required", tok)) {
+		D(("*PAM_F_REQUIRED*"));
+		actions[PAM_SUCCESS] = _PAM_ACTION_OK;
+		actions[PAM_NEW_AUTHTOK_REQD] = _PAM_ACTION_OK;
+                actions[PAM_IGNORE] = _PAM_ACTION_IGNORE;
+		_pam_set_default_control(actions, _PAM_ACTION_BAD);
+	    } else if (!strcasecmp("requisite", tok)) {
+		D(("*PAM_F_REQUISITE*"));
+		actions[PAM_SUCCESS] = _PAM_ACTION_OK;
+		actions[PAM_NEW_AUTHTOK_REQD] = _PAM_ACTION_OK;
+                actions[PAM_IGNORE] = _PAM_ACTION_IGNORE;
+		_pam_set_default_control(actions, _PAM_ACTION_DIE);
+	    } else if (!strcasecmp("optional", tok)) {
+		D(("*PAM_F_OPTIONAL*"));
+		actions[PAM_SUCCESS] = _PAM_ACTION_OK;
+		actions[PAM_NEW_AUTHTOK_REQD] = _PAM_ACTION_OK;
+		_pam_set_default_control(actions, _PAM_ACTION_IGNORE);
+	    } else if (!strcasecmp("sufficient", tok)) {
+		D(("*PAM_F_SUFFICIENT*"));
+		actions[PAM_SUCCESS] = _PAM_ACTION_DONE;
+		actions[PAM_NEW_AUTHTOK_REQD] = _PAM_ACTION_DONE;
+		_pam_set_default_control(actions, _PAM_ACTION_IGNORE);
+	    } else if (!strcasecmp("include", tok)) {
+		D(("*PAM_F_INCLUDE*"));
+		pam_include = 1;
+		substack = 0;
+	    } else if (!strcasecmp("substack", tok)) {
+		D(("*PAM_F_SUBSTACK*"));
+		pam_include = 1;
+		substack = 1;
+	    } else {
+		D(("will need to parse %s", tok));
+		_pam_parse_control(actions, tok);
+		/* by default the default is to treat as failure */
+		_pam_set_default_control(actions, _PAM_ACTION_BAD);
+	    }
+
+	    tok = _pam_StrTok(NULL, " \n\t", &nexttok);
+	    if (pam_include) {
+		if (substack) {
+		    res = _pam_add_handler(pamh, PAM_HT_SUBSTACK, other,
+				stack_level, module_type, actions, tok,
+				0, NULL, 0);
+		    if (res != PAM_SUCCESS) {
+			pam_syslog(pamh, LOG_ERR, "error adding substack %s", tok);
+			D(("failed to load module - aborting"));
+			return PAM_ABORT;
+		    }
+		}
+		if (_pam_load_conf_file(pamh, tok, this_service, module_type,
+		    stack_level + substack
+#ifdef PAM_READ_BOTH_CONFS
+					      , !other
+#endif /* PAM_READ_BOTH_CONFS */
+		    ) == PAM_SUCCESS)
+		    continue;
+		_pam_set_default_control(actions, _PAM_ACTION_BAD);
+		mod_path = NULL;
+		handler_type = PAM_HT_MUST_FAIL;
+		nexttok = NULL;
+	    } else if (tok != NULL) {
+		mod_path = tok;
+		D(("mod_path = %s",mod_path));
+	    } else {
+		/* no module name given */
+		D(("_pam_init_handlers: no module name supplied"));
+		pam_syslog(pamh, LOG_ERR,
+		           "(%s) no module name supplied", this_service);
+		mod_path = NULL;
+		handler_type = PAM_HT_MUST_FAIL;
+	    }
+
+	    /* nexttok points to remaining arguments... */
+
+	    if (nexttok != NULL) {
+		D(("list: %s",nexttok));
+	        argvlen = _pam_mkargv(nexttok, &argv, &argc);
+		D(("argvlen = %d",argvlen));
+	    } else {               /* there are no arguments so fix by hand */
+		D(("_pam_init_handlers: empty argument list"));
+		argvlen = argc = 0;
+		argv = NULL;
+	    }
+
+#ifdef PAM_DEBUG
+	    {
+		int y;
+
+		D(("CONF%s: %s%s %d %s %d"
+		   , handler_type==PAM_HT_MUST_FAIL?"<*will fail*>":""
+		   , this_service, other ? "(backup)":""
+		   , module_type
+		   , mod_path, argc));
+		for (y = 0; y < argc; y++) {
+		    D(("CONF: %s", argv[y]));
+		}
+		for (y = 0; y<_PAM_RETURN_VALUES; ++y) {
+		    D(("RETURN %s(%d) -> %d %s",
+		       _pam_token_returns[y], y, actions[y],
+		       actions[y]>0 ? "jump":
+			_pam_token_actions[-actions[y]]));
+		}
+	    }
+#endif
+
+	    res = _pam_add_handler(pamh, handler_type, other, stack_level
+				   , module_type, actions, mod_path
+				   , argc, argv, argvlen);
+	    if (res != PAM_SUCCESS) {
+		pam_syslog(pamh, LOG_ERR, "error loading %s", mod_path);
+		D(("failed to load module - aborting"));
+		return PAM_ABORT;
+	    }
+	}
+    }
+
+    return ( (x < 0) ? PAM_ABORT:PAM_SUCCESS );
+}
+
+static int
+_pam_open_config_file(pam_handle_t *pamh
+			, const char *service
+			, char **path
+			, FILE **file)
+{
+    const char *pamd_dirs[] = { PAM_CONFIG_DF, PAM_CONFIG_DIST_DF
+#ifdef VENDORDIR
+                               , PAM_CONFIG_DIST2_DF
+#endif
+    };
+    char *p = NULL;
+    FILE *f;
+    size_t i;
+
+    /* Absolute path */
+    if (service[0] == '/') {
+	p = _pam_strdup(service);
+	if (p == NULL) {
+	    pam_syslog(pamh, LOG_CRIT, "strdup failed");
+	    return PAM_BUF_ERR;
+	}
+    } else if (pamh->confdir != NULL) {
+        if (asprintf (&p, "%s/%s", pamh->confdir, service) < 0) {
+	    pam_syslog(pamh, LOG_CRIT, "asprintf failed");
+	    return PAM_BUF_ERR;
+	}
+    }
+
+    if (p != NULL) {
+	D(("opening %s", p));
+	f = fopen(p, "r");
+	if (f != NULL) {
+	    *path = p;
+	    *file = f;
+	    return PAM_SUCCESS;
+	}
+	_pam_drop(p);
+	return PAM_ABORT;
+    }
+
+    for (i = 0; i < PAM_ARRAY_SIZE(pamd_dirs); i++) {
+        if (asprintf (&p, pamd_dirs[i], service) < 0) {
+	    pam_syslog(pamh, LOG_CRIT, "asprintf failed");
+	    return PAM_BUF_ERR;
+	}
+
+	D(("opening %s", p));
+	f = fopen(p, "r");
+	if (f != NULL) {
+	    *path = p;
+	    *file = f;
+	    return PAM_SUCCESS;
+	}
+	_pam_drop(p);
+    }
+
+    return PAM_ABORT;
+}
+
+static int _pam_load_conf_file(pam_handle_t *pamh, const char *config_name
+				, const char *service /* specific file */
+				, int module_type /* specific type */
+				, int stack_level /* level of substack */
+#ifdef PAM_READ_BOTH_CONFS
+				, int not_other
+#endif /* PAM_READ_BOTH_CONFS */
+    )
+{
+    FILE *f;
+    char *path = NULL;
+    int retval = PAM_ABORT;
+
+    D(("_pam_load_conf_file called"));
+
+    if (stack_level >= PAM_SUBSTACK_MAX_LEVEL) {
+	D(("maximum level of substacks reached"));
+	pam_syslog(pamh, LOG_ERR, "maximum level of substacks reached");
+	return PAM_ABORT;
+    }
+
+    if (config_name == NULL) {
+	D(("no config file supplied"));
+	pam_syslog(pamh, LOG_ERR, "(%s) no config name supplied", service);
+	return PAM_ABORT;
+    }
+
+    if (_pam_open_config_file(pamh, config_name, &path, &f) == PAM_SUCCESS) {
+	retval = _pam_parse_conf_file(pamh, f, service, module_type, stack_level
+#ifdef PAM_READ_BOTH_CONFS
+					      , not_other
+#endif /* PAM_READ_BOTH_CONFS */
+	    );
+	if (retval != PAM_SUCCESS)
+	    pam_syslog(pamh, LOG_ERR,
+		       "_pam_load_conf_file: error reading %s: %s",
+		       path, pam_strerror(pamh, retval));
+	_pam_drop(path);
+	fclose(f);
+    } else {
+	D(("unable to open %s", config_name));
+	pam_syslog(pamh, LOG_ERR,
+		   "_pam_load_conf_file: unable to open config for %s",
+		   config_name);
+    }
+
+    return retval;
+}
+
+/* Parse config file, allocate handler structures, dlopen() */
+int _pam_init_handlers(pam_handle_t *pamh)
+{
+    FILE *f;
+    int retval;
+
+    D(("_pam_init_handlers called"));
+    IF_NO_PAMH("_pam_init_handlers",pamh,PAM_SYSTEM_ERR);
+
+    /* Return immediately if everything is already loaded */
+    if (pamh->handlers.handlers_loaded) {
+	return PAM_SUCCESS;
+    }
+
+    D(("_pam_init_handlers: initializing"));
+
+    /* First clean the service structure */
+
+    _pam_free_handlers(pamh);
+    if (! pamh->handlers.module) {
+	if ((pamh->handlers.module =
+	     malloc(MODULE_CHUNK * sizeof(struct loaded_module))) == NULL) {
+	    pam_syslog(pamh, LOG_CRIT,
+		       "_pam_init_handlers: no memory loading module");
+	    return PAM_BUF_ERR;
+	}
+	pamh->handlers.modules_allocated = MODULE_CHUNK;
+	pamh->handlers.modules_used = 0;
+    }
+
+    if (pamh->service_name == NULL) {
+	return PAM_BAD_ITEM;                /* XXX - better error? */
+    }
+
+#ifdef PAM_LOCKING
+    /* Is the PAM subsystem locked? */
+    {
+	 int fd_tmp;
+
+	 if ((fd_tmp = open( PAM_LOCK_FILE, O_RDONLY )) != -1) {
+	     pam_syslog(pamh, LOG_ERR,
+			"_pam_init_handlers: PAM lockfile ("
+			PAM_LOCK_FILE ") exists - aborting");
+	      (void) close(fd_tmp);
+	      /*
+	       * to avoid swamping the system with requests
+	       */
+	      _pam_start_timer(pamh);
+	      pam_fail_delay(pamh, 5000000);
+	      _pam_await_timer(pamh, PAM_ABORT);
+
+	      return PAM_ABORT;
+	 }
+    }
+#endif /* PAM_LOCKING */
+
+    /*
+     * Now parse the config file(s) and add handlers
+     */
+    {
+	struct stat test_d;
+
+	/* Is there a PAM_CONFIG_D directory? */
+	if (pamh->confdir != NULL ||
+	    (stat(PAM_CONFIG_D, &test_d) == 0 && S_ISDIR(test_d.st_mode)) ||
+	    (stat(PAM_CONFIG_DIST_D, &test_d) == 0 && S_ISDIR(test_d.st_mode))
+#ifdef PAM_CONFIG_DIST2_D
+	    || (stat(PAM_CONFIG_DIST2_D, &test_d) == 0
+		&& S_ISDIR(test_d.st_mode))
+#endif
+	   ) {
+	    char *path = NULL;
+	    int read_something=0;
+
+	    if (_pam_open_config_file(pamh, pamh->service_name, &path, &f) == PAM_SUCCESS) {
+		retval = _pam_parse_conf_file(pamh, f, pamh->service_name,
+		    PAM_T_ANY, 0
+#ifdef PAM_READ_BOTH_CONFS
+					      , 0
+#endif /* PAM_READ_BOTH_CONFS */
+		    );
+		if (retval != PAM_SUCCESS) {
+		    pam_syslog(pamh, LOG_ERR,
+				    "_pam_init_handlers: error reading %s",
+				    path);
+		    pam_syslog(pamh, LOG_ERR, "_pam_init_handlers: [%s]",
+				    pam_strerror(pamh, retval));
+		} else {
+		    read_something = 1;
+		}
+		_pam_drop(path);
+		fclose(f);
+	    } else {
+		D(("unable to open configuration for %s", pamh->service_name));
+#ifdef PAM_READ_BOTH_CONFS
+		D(("checking %s", PAM_CONFIG));
+
+		if (pamh->confdir == NULL
+		    && (f = fopen(PAM_CONFIG,"r")) != NULL) {
+		    retval = _pam_parse_conf_file(pamh, f, NULL, PAM_T_ANY, 0, 1);
+		    fclose(f);
+		} else
+#endif /* PAM_READ_BOTH_CONFS */
+		retval = PAM_SUCCESS;
+		/*
+		 * XXX - should we log an error? Some people want to always
+		 * use "other"
+		 */
+	    }
+
+	    if (retval == PAM_SUCCESS) {
+		/* now parse the PAM_DEFAULT_SERVICE */
+
+		if (_pam_open_config_file(pamh, PAM_DEFAULT_SERVICE, &path, &f) == PAM_SUCCESS) {
+		    /* would test magic here? */
+		    retval = _pam_parse_conf_file(pamh, f, PAM_DEFAULT_SERVICE,
+			PAM_T_ANY, 0
+#ifdef PAM_READ_BOTH_CONFS
+						  , 0
+#endif /* PAM_READ_BOTH_CONFS */
+			);
+		    if (retval != PAM_SUCCESS) {
+			pam_syslog(pamh, LOG_ERR,
+					"_pam_init_handlers: error reading %s",
+					path);
+			pam_syslog(pamh, LOG_ERR,
+					"_pam_init_handlers: [%s]",
+					pam_strerror(pamh, retval));
+		    } else {
+			read_something = 1;
+		    }
+		    _pam_drop(path);
+		    fclose(f);
+		} else {
+		    D(("unable to open %s", PAM_DEFAULT_SERVICE));
+		    pam_syslog(pamh, LOG_ERR,
+				    "_pam_init_handlers: no default config %s",
+				    PAM_DEFAULT_SERVICE);
+		}
+		if (!read_something) {          /* nothing read successfully */
+		    retval = PAM_ABORT;
+		}
+	    }
+	} else {
+	    if ((f = fopen(PAM_CONFIG, "r")) == NULL) {
+		pam_syslog(pamh, LOG_ERR, "_pam_init_handlers: could not open "
+				PAM_CONFIG );
+		return PAM_ABORT;
+	    }
+
+	    retval = _pam_parse_conf_file(pamh, f, NULL, PAM_T_ANY, 0
+#ifdef PAM_READ_BOTH_CONFS
+					  , 0
+#endif /* PAM_READ_BOTH_CONFS */
+		);
+
+	    D(("closing configuration file"));
+	    fclose(f);
+	}
+    }
+
+    if (retval != PAM_SUCCESS) {
+	/* Read error */
+	pam_syslog(pamh, LOG_ERR, "error reading PAM configuration file");
+	return PAM_ABORT;
+    }
+
+    pamh->handlers.handlers_loaded = 1;
+
+    D(("_pam_init_handlers exiting"));
+    return PAM_SUCCESS;
+}
+
+/*
+ * This is where we read a line of the PAM config file. The line may be
+ * preceded by lines of comments and also extended with "\\\n"
+ */
+
+static int _pam_assemble_line(FILE *f, char *buffer, int buf_len)
+{
+    char *p = buffer;
+    char *endp = buffer + buf_len;
+    char *s, *os;
+    int used = 0;
+
+    /* loop broken with a 'break' when a non-'\\n' ended line is read */
+
+    D(("called."));
+    for (;;) {
+	if (p >= endp) {
+	    /* Overflow */
+	    D(("_pam_assemble_line: overflow"));
+	    return -1;
+	}
+	if (fgets(p, endp - p, f) == NULL) {
+	    if (used) {
+		/* Incomplete read */
+		return -1;
+	    } else {
+		/* EOF */
+		return 0;
+	    }
+	}
+
+	/* skip leading spaces --- line may be blank */
+
+	s = p + strspn(p, " \n\t");
+	if (*s && (*s != '#')) {
+	    os = s;
+
+	    /*
+	     * we are only interested in characters before the first '#'
+	     * character
+	     */
+
+	    while (*s && *s != '#')
+		 ++s;
+	    if (*s == '#') {
+		 *s = '\0';
+		 used += strlen(os);
+		 break;                /* the line has been read */
+	    }
+
+	    s = os;
+
+	    /*
+	     * Check for backslash by scanning back from the end of
+	     * the entered line, the '\n' has been included since
+	     * normally a line is terminated with this
+	     * character. fgets() should only return one though!
+	     */
+
+	    s += strlen(s);
+	    while (s > os && ((*--s == ' ') || (*s == '\t')
+			      || (*s == '\n')));
+
+	    /* check if it ends with a backslash */
+	    if (*s == '\\') {
+		*s++ = ' ';             /* replace backslash with ' ' */
+		*s = '\0';              /* truncate the line here */
+		used += strlen(os);
+		p = s;                  /* there is more ... */
+	    } else {
+		/* End of the line! */
+		used += strlen(os);
+		break;                  /* this is the complete line */
+	    }
+
+	} else {
+	    /* Nothing in this line */
+	    /* Don't move p         */
+	}
+    }
+
+    return used;
+}
+
+static char *
+extract_modulename(const char *mod_path)
+{
+  const char *p = strrchr (mod_path, '/');
+  char *dot, *retval;
+
+  if (p == NULL)
+    p = mod_path;
+  else
+    p++;
+
+  if ((retval = _pam_strdup (p)) == NULL)
+    return NULL;
+
+  dot = strrchr (retval, '.');
+  if (dot)
+    *dot = '\0';
+
+  if (*retval == '\0' || strcmp(retval, "?") == 0) {
+    /* do not allow empty module name or "?" to avoid confusing audit trail */
+    _pam_drop(retval);
+    return NULL;
+  }
+
+  return retval;
+}
+
+static struct loaded_module *
+_pam_load_module(pam_handle_t *pamh, const char *mod_path, int handler_type)
+{
+    int x = 0;
+    int success;
+    struct loaded_module *mod;
+
+    D(("_pam_load_module: loading module `%s'", mod_path));
+
+    mod = pamh->handlers.module;
+
+    /* First, ensure the module is loaded */
+    while (x < pamh->handlers.modules_used) {
+	if (!strcmp(mod[x].name, mod_path)) {  /* case sensitive ! */
+	    break;
+	}
+	x++;
+    }
+    if (x == pamh->handlers.modules_used) {
+	/* Not found */
+	if (pamh->handlers.modules_allocated == pamh->handlers.modules_used) {
+	    /* will need more memory */
+	    void *tmp = realloc(pamh->handlers.module,
+                               (pamh->handlers.modules_allocated+MODULE_CHUNK)
+                               *sizeof(struct loaded_module));
+	    if (tmp == NULL) {
+		D(("cannot enlarge module pointer memory"));
+		pam_syslog(pamh, LOG_CRIT,
+				"realloc returned NULL in _pam_load_module");
+		return NULL;
+	    }
+	    pamh->handlers.module = tmp;
+	    pamh->handlers.modules_allocated += MODULE_CHUNK;
+	}
+	mod = &(pamh->handlers.module[x]);
+	/* Be pessimistic... */
+	success = PAM_ABORT;
+
+	D(("_pam_load_module: _pam_dlopen(%s)", mod_path));
+	mod->dl_handle = _pam_dlopen(mod_path);
+	D(("_pam_load_module: _pam_dlopen'ed"));
+	D(("_pam_load_module: dlopen'ed"));
+	if (mod->dl_handle == NULL) {
+	    const char *isa = strstr(mod_path, "$ISA");
+	    size_t isa_len = strlen("$ISA");
+
+	    if (isa != NULL) {
+		size_t pam_isa_len = strlen(_PAM_ISA);
+		char *mod_full_isa_path =
+			malloc(strlen(mod_path) - isa_len + pam_isa_len + 1);
+
+		if (mod_full_isa_path == NULL) {
+		    D(("_pam_load_module: couldn't get memory for mod_path"));
+		    pam_syslog(pamh, LOG_CRIT, "no memory for module path");
+		    success = PAM_ABORT;
+		} else {
+		    char *p = mod_full_isa_path;
+
+		    memcpy(p, mod_path, isa - mod_path);
+		    p += isa - mod_path;
+		    memcpy(p, _PAM_ISA, pam_isa_len);
+		    p += pam_isa_len;
+		    strcpy(p, isa + isa_len);
+
+		    mod->dl_handle = _pam_dlopen(mod_full_isa_path);
+		    _pam_drop(mod_full_isa_path);
+		}
+	    }
+	}
+	if (mod->dl_handle == NULL) {
+	    D(("_pam_load_module: _pam_dlopen(%s) failed", mod_path));
+	    if (handler_type != PAM_HT_SILENT_MODULE)
+		pam_syslog(pamh, LOG_ERR, "unable to dlopen(%s): %s", mod_path,
+		    _pam_dlerror());
+	    /* Don't abort yet; static code may be able to find function.
+	     * But defaults to abort if nothing found below... */
+	} else {
+	    D(("module added successfully"));
+	    success = PAM_SUCCESS;
+	    mod->type = PAM_MT_DYNAMIC_MOD;
+	    pamh->handlers.modules_used++;
+	}
+
+	if (success != PAM_SUCCESS) {	         /* add a malformed module */
+	    mod->dl_handle = NULL;
+	    mod->type = PAM_MT_FAULTY_MOD;
+	    pamh->handlers.modules_used++;
+	    if (handler_type != PAM_HT_SILENT_MODULE)
+		pam_syslog(pamh, LOG_ERR, "adding faulty module: %s", mod_path);
+	    success = PAM_SUCCESS;  /* We have successfully added a module */
+	}
+
+	/* indicate its name - later we will search for it by this */
+	if ((mod->name = _pam_strdup(mod_path)) == NULL) {
+	    D(("_pam_load_module: couldn't get memory for mod_path"));
+	    pam_syslog(pamh, LOG_CRIT, "no memory for module path");
+	    success = PAM_ABORT;
+	}
+
+    } else {                           /* x != pamh->handlers.modules_used */
+	mod += x;                                    /* the located module */
+	success = PAM_SUCCESS;
+    }
+    return success == PAM_SUCCESS ? mod : NULL;
+}
+
+int _pam_add_handler(pam_handle_t *pamh
+		     , int handler_type, int other, int stack_level, int type
+		     , int *actions, const char *mod_path
+		     , int argc, char **argv, int argvlen)
+{
+    struct loaded_module *mod = NULL;
+    struct handler **handler_p;
+    struct handler **handler_p2;
+    struct handlers *the_handlers;
+    const char *sym, *sym2;
+    char *mod_full_path;
+    servicefn func, func2;
+    int mod_type = PAM_MT_FAULTY_MOD;
+
+    D(("called."));
+    IF_NO_PAMH("_pam_add_handler",pamh,PAM_SYSTEM_ERR);
+
+    D(("_pam_add_handler: adding type %d, handler_type %d, module `%s'",
+	type, handler_type, mod_path));
+
+    if ((handler_type == PAM_HT_MODULE || handler_type == PAM_HT_SILENT_MODULE) &&
+	mod_path != NULL) {
+	if (mod_path[0] == '/') {
+	    mod = _pam_load_module(pamh, mod_path, handler_type);
+	} else if (asprintf(&mod_full_path, "%s%s",
+			     DEFAULT_MODULE_PATH, mod_path) >= 0) {
+	    mod = _pam_load_module(pamh, mod_full_path, handler_type);
+	    _pam_drop(mod_full_path);
+	} else {
+	    pam_syslog(pamh, LOG_CRIT, "cannot malloc full mod path");
+	    return PAM_ABORT;
+	}
+
+	if (mod == NULL) {
+	    /* if we get here with NULL it means allocation error */
+	    return PAM_ABORT;
+	}
+
+	mod_type = mod->type;
+    }
+
+    if (mod_path == NULL)
+	mod_path = UNKNOWN_MODULE;
+
+    /*
+     * At this point 'mod' points to the stored/loaded module.
+     */
+
+    /* Now define the handler(s) based on mod->dlhandle and type */
+
+    /* decide which list of handlers to use */
+    the_handlers = (other) ? &pamh->handlers.other : &pamh->handlers.conf;
+
+    handler_p = handler_p2 = NULL;
+    func = func2 = NULL;
+    sym2 = NULL;
+
+    /* point handler_p's at the root addresses of the function stacks */
+    switch (type) {
+    case PAM_T_AUTH:
+	handler_p = &the_handlers->authenticate;
+	sym = "pam_sm_authenticate";
+	handler_p2 = &the_handlers->setcred;
+	sym2 = "pam_sm_setcred";
+	break;
+    case PAM_T_SESS:
+	handler_p = &the_handlers->open_session;
+	sym = "pam_sm_open_session";
+	handler_p2 = &the_handlers->close_session;
+	sym2 = "pam_sm_close_session";
+	break;
+    case PAM_T_ACCT:
+	handler_p = &the_handlers->acct_mgmt;
+	sym = "pam_sm_acct_mgmt";
+	break;
+    case PAM_T_PASS:
+	handler_p = &the_handlers->chauthtok;
+	sym = "pam_sm_chauthtok";
+	break;
+    default:
+	/* Illegal module type */
+	D(("_pam_add_handler: illegal module type %d", type));
+	return PAM_ABORT;
+    }
+
+    /* are the modules reliable? */
+    if (mod_type != PAM_MT_DYNAMIC_MOD &&
+	 mod_type != PAM_MT_FAULTY_MOD) {
+	D(("_pam_add_handlers: illegal module library type; %d", mod_type));
+	pam_syslog(pamh, LOG_ERR,
+			"internal error: module library type not known: %s;%d",
+			sym, mod_type);
+	return PAM_ABORT;
+    }
+
+    /* now identify this module's functions - for non-faulty modules */
+
+    if ((mod_type == PAM_MT_DYNAMIC_MOD) &&
+        !(func = _pam_dlsym(mod->dl_handle, sym)) ) {
+	pam_syslog(pamh, LOG_ERR, "unable to resolve symbol: %s", sym);
+    }
+    if (sym2) {
+	if ((mod_type == PAM_MT_DYNAMIC_MOD) &&
+	    !(func2 = _pam_dlsym(mod->dl_handle, sym2)) ) {
+	    pam_syslog(pamh, LOG_ERR, "unable to resolve symbol: %s", sym2);
+	}
+    }
+
+    /* here func (and perhaps func2) point to the appropriate functions */
+
+    /* add new handler to end of existing list */
+    while (*handler_p != NULL) {
+	handler_p = &((*handler_p)->next);
+    }
+
+    if ((*handler_p = malloc(sizeof(struct handler))) == NULL) {
+	pam_syslog(pamh, LOG_CRIT, "cannot malloc struct handler #1");
+	return (PAM_ABORT);
+    }
+
+    (*handler_p)->handler_type = handler_type;
+    (*handler_p)->stack_level = stack_level;
+    (*handler_p)->func = func;
+    memcpy((*handler_p)->actions,actions,sizeof((*handler_p)->actions));
+    (*handler_p)->cached_retval = _PAM_INVALID_RETVAL;
+    (*handler_p)->cached_retval_p = &((*handler_p)->cached_retval);
+    (*handler_p)->argc = argc;
+    (*handler_p)->argv = argv;                       /* not a copy */
+    if (((*handler_p)->mod_name = extract_modulename(mod_path)) == NULL)
+	return PAM_ABORT;
+    (*handler_p)->grantor = 0;
+    (*handler_p)->next = NULL;
+
+    /* some of the modules have a second calling function */
+    if (handler_p2) {
+	/* add new handler to end of existing list */
+	while (*handler_p2) {
+	    handler_p2 = &((*handler_p2)->next);
+	}
+
+	if ((*handler_p2 = malloc(sizeof(struct handler))) == NULL) {
+	    pam_syslog(pamh, LOG_CRIT, "cannot malloc struct handler #2");
+	    return (PAM_ABORT);
+	}
+
+	(*handler_p2)->handler_type = handler_type;
+	(*handler_p2)->stack_level = stack_level;
+	(*handler_p2)->func = func2;
+	memcpy((*handler_p2)->actions,actions,sizeof((*handler_p2)->actions));
+	(*handler_p2)->cached_retval =  _PAM_INVALID_RETVAL;     /* ignored */
+	/* Note, this next entry points to the handler_p value! */
+	(*handler_p2)->cached_retval_p = &((*handler_p)->cached_retval);
+	(*handler_p2)->argc = argc;
+	if (argv) {
+	    if (((*handler_p2)->argv = malloc(argvlen)) == NULL) {
+		pam_syslog(pamh, LOG_CRIT, "cannot malloc argv for handler #2");
+		return (PAM_ABORT);
+	    }
+	    memcpy((*handler_p2)->argv, argv, argvlen);
+	} else {
+	    (*handler_p2)->argv = NULL;              /* no arguments */
+	}
+	if (((*handler_p2)->mod_name = extract_modulename(mod_path)) == NULL)
+	    return PAM_ABORT;
+	(*handler_p2)->grantor = 0;
+	(*handler_p2)->next = NULL;
+    }
+
+    D(("_pam_add_handler: returning successfully"));
+
+    return PAM_SUCCESS;
+}
+
+/* Free various allocated structures and dlclose() the libs */
+int _pam_free_handlers(pam_handle_t *pamh)
+{
+    struct loaded_module *mod;
+
+    D(("called."));
+    IF_NO_PAMH("_pam_free_handlers",pamh,PAM_SYSTEM_ERR);
+
+    mod = pamh->handlers.module;
+
+    /* Close all loaded modules */
+
+    while (pamh->handlers.modules_used) {
+	D(("_pam_free_handlers: dlclose(%s)", mod->name));
+	free(mod->name);
+	if (mod->type == PAM_MT_DYNAMIC_MOD) {
+	    _pam_dlclose(mod->dl_handle);
+	}
+	mod++;
+	pamh->handlers.modules_used--;
+    }
+
+    /* Free all the handlers */
+
+    _pam_free_handlers_aux(&(pamh->handlers.conf.authenticate));
+    _pam_free_handlers_aux(&(pamh->handlers.conf.setcred));
+    _pam_free_handlers_aux(&(pamh->handlers.conf.acct_mgmt));
+    _pam_free_handlers_aux(&(pamh->handlers.conf.open_session));
+    _pam_free_handlers_aux(&(pamh->handlers.conf.close_session));
+    _pam_free_handlers_aux(&(pamh->handlers.conf.chauthtok));
+
+    _pam_free_handlers_aux(&(pamh->handlers.other.authenticate));
+    _pam_free_handlers_aux(&(pamh->handlers.other.setcred));
+    _pam_free_handlers_aux(&(pamh->handlers.other.acct_mgmt));
+    _pam_free_handlers_aux(&(pamh->handlers.other.open_session));
+    _pam_free_handlers_aux(&(pamh->handlers.other.close_session));
+    _pam_free_handlers_aux(&(pamh->handlers.other.chauthtok));
+
+    /* no more loaded modules */
+
+    _pam_drop(pamh->handlers.module);
+
+    /* Indicate that handlers are not initialized for this pamh */
+
+    pamh->handlers.handlers_loaded = 0;
+
+    return PAM_SUCCESS;
+}
+
+void _pam_start_handlers(pam_handle_t *pamh)
+{
+    D(("called."));
+    /* NB. There is no check for a NULL pamh here, since no return
+     * value to communicate the fact!  */
+
+    /* Indicate that handlers are not initialized for this pamh */
+    pamh->handlers.handlers_loaded = 0;
+
+    pamh->handlers.modules_allocated = 0;
+    pamh->handlers.modules_used = 0;
+    pamh->handlers.module = NULL;
+
+    /* initialize the .conf and .other entries */
+
+    pamh->handlers.conf.authenticate = NULL;
+    pamh->handlers.conf.setcred = NULL;
+    pamh->handlers.conf.acct_mgmt = NULL;
+    pamh->handlers.conf.open_session = NULL;
+    pamh->handlers.conf.close_session = NULL;
+    pamh->handlers.conf.chauthtok = NULL;
+
+    pamh->handlers.other.authenticate = NULL;
+    pamh->handlers.other.setcred = NULL;
+    pamh->handlers.other.acct_mgmt = NULL;
+    pamh->handlers.other.open_session = NULL;
+    pamh->handlers.other.close_session = NULL;
+    pamh->handlers.other.chauthtok = NULL;
+}
+
+void _pam_free_handlers_aux(struct handler **hp)
+{
+    struct handler *h = *hp;
+    struct handler *last;
+
+    D(("called."));
+    while (h) {
+	last = h;
+	_pam_drop(h->argv);  /* This is all allocated in a single chunk */
+	_pam_drop(h->mod_name);
+	h = h->next;
+	memset(last, 0, sizeof(*last));
+	free(last);
+    }
+
+    *hp = NULL;
+}
diff --git a/libpam/pam_item.c b/libpam/pam_item.c
new file mode 100644
index 0000000..d6af710
--- /dev/null
+++ b/libpam/pam_item.c
@@ -0,0 +1,396 @@
+/* pam_item.c */
+
+/*
+ * $Id$
+ */
+
+#include "pam_private.h"
+
+#include <ctype.h>
+#include <stdlib.h>
+#include <string.h>
+#include <syslog.h>
+
+#define TRY_SET(X, Y)                      \
+{                                          \
+    if ((X) != (Y)) {		           \
+	char *_TMP_ = _pam_strdup(Y);      \
+	if (_TMP_ == NULL && (Y) != NULL)  \
+	    return PAM_BUF_ERR;            \
+	free(X);                           \
+	(X) = _TMP_;                       \
+    }					   \
+}
+
+/* functions */
+
+int pam_set_item (pam_handle_t *pamh, int item_type, const void *item)
+{
+    int retval;
+
+    D(("called"));
+
+    IF_NO_PAMH("pam_set_item", pamh, PAM_SYSTEM_ERR);
+
+    retval = PAM_SUCCESS;
+
+    switch (item_type) {
+
+    case PAM_SERVICE:
+	/* Setting handlers_loaded to 0 will cause the handlers
+	 * to be reloaded on the next call to a service module.
+	 */
+	pamh->handlers.handlers_loaded = 0;
+	TRY_SET(pamh->service_name, item);
+	{
+	    char *tmp;
+	    for (tmp=pamh->service_name; *tmp; ++tmp)
+		*tmp = tolower(*tmp);                 /* require lower case */
+	}
+	break;
+
+    case PAM_USER:
+	TRY_SET(pamh->user, item);
+	pamh->former.fail_user = PAM_SUCCESS;
+	break;
+
+    case PAM_USER_PROMPT:
+	TRY_SET(pamh->prompt, item);
+	pamh->former.fail_user = PAM_SUCCESS;
+	break;
+
+    case PAM_TTY:
+	D(("setting tty to %s", item));
+	TRY_SET(pamh->tty, item);
+	break;
+
+    case PAM_RUSER:
+	TRY_SET(pamh->ruser, item);
+	break;
+
+    case PAM_RHOST:
+	TRY_SET(pamh->rhost, item);
+	break;
+
+    case PAM_AUTHTOK:
+	/*
+	 * PAM_AUTHTOK and PAM_OLDAUTHTOK are only accessible from
+	 * modules.
+	 */
+	if (__PAM_FROM_MODULE(pamh)) {
+	    if (pamh->authtok != item) {
+		_pam_overwrite(pamh->authtok);
+		TRY_SET(pamh->authtok, item);
+	    }
+	} else {
+	    retval = PAM_BAD_ITEM;
+	}
+
+	break;
+
+    case PAM_OLDAUTHTOK:
+	/*
+	 * PAM_AUTHTOK and PAM_OLDAUTHTOK are only accessible from
+	 * modules.
+	 */
+	if (__PAM_FROM_MODULE(pamh)) {
+	    if (pamh->oldauthtok != item) {
+		_pam_overwrite(pamh->oldauthtok);
+		TRY_SET(pamh->oldauthtok, item);
+	    }
+	} else {
+	    retval = PAM_BAD_ITEM;
+	}
+
+	break;
+
+    case PAM_CONV:              /* want to change the conversation function */
+	if (item == NULL) {
+	    pam_syslog(pamh, LOG_ERR,
+		       "pam_set_item: attempt to set conv() to NULL");
+	    retval = PAM_PERM_DENIED;
+	} else {
+	    struct pam_conv *tconv;
+
+	    if ((tconv=
+		 (struct pam_conv *) malloc(sizeof(struct pam_conv))
+		) == NULL) {
+		pam_syslog(pamh, LOG_CRIT,
+				"pam_set_item: malloc failed for pam_conv");
+		retval = PAM_BUF_ERR;
+	    } else {
+		memcpy(tconv, item, sizeof(struct pam_conv));
+		_pam_drop(pamh->pam_conversation);
+		pamh->pam_conversation = tconv;
+		pamh->former.fail_user = PAM_SUCCESS;
+	    }
+	}
+        break;
+
+    case PAM_FAIL_DELAY:
+	pamh->fail_delay.delay_fn_ptr = item;
+	break;
+
+    case PAM_XDISPLAY:
+	TRY_SET(pamh->xdisplay, item);
+	break;
+
+    case PAM_XAUTHDATA:
+	if (&pamh->xauth == item)
+	    break;
+	if (pamh->xauth.namelen) {
+	    _pam_overwrite(pamh->xauth.name);
+	    free(pamh->xauth.name);
+	}
+	if (pamh->xauth.datalen) {
+	    _pam_overwrite_n(pamh->xauth.data,
+			   (unsigned int) pamh->xauth.datalen);
+	    free(pamh->xauth.data);
+	}
+	pamh->xauth = *((const struct pam_xauth_data *) item);
+	if ((pamh->xauth.name=_pam_strdup(pamh->xauth.name)) == NULL) {
+	    memset(&pamh->xauth, '\0', sizeof(pamh->xauth));
+	    return PAM_BUF_ERR;
+	}
+	if ((pamh->xauth.data=_pam_memdup(pamh->xauth.data,
+	    pamh->xauth.datalen)) == NULL) {
+	    _pam_overwrite(pamh->xauth.name);
+	    free(pamh->xauth.name);
+	    memset(&pamh->xauth, '\0', sizeof(pamh->xauth));
+	    return PAM_BUF_ERR;
+	}
+	break;
+
+    case PAM_AUTHTOK_TYPE:
+	TRY_SET(pamh->authtok_type, item);
+	break;
+
+    default:
+	retval = PAM_BAD_ITEM;
+    }
+
+    return retval;
+}
+
+int pam_get_item (const pam_handle_t *pamh, int item_type, const void **item)
+{
+    int retval = PAM_SUCCESS;
+
+    D(("called."));
+    IF_NO_PAMH("pam_get_item", pamh, PAM_SYSTEM_ERR);
+
+    if (item == NULL) {
+	pam_syslog(pamh, LOG_ERR,
+			"pam_get_item: nowhere to place requested item");
+	return PAM_PERM_DENIED;
+    }
+    else
+	*item = NULL;
+
+    switch (item_type) {
+    case PAM_SERVICE:
+	*item = pamh->service_name;
+	break;
+
+    case PAM_USER:
+	D(("returning user=%s", pamh->user));
+	*item = pamh->user;
+	break;
+
+    case PAM_USER_PROMPT:
+	D(("returning userprompt=%s", pamh->user));
+	*item = pamh->prompt;
+	break;
+
+    case PAM_TTY:
+	D(("returning tty=%s", pamh->tty));
+	*item = pamh->tty;
+	break;
+
+    case PAM_RUSER:
+	*item = pamh->ruser;
+	break;
+
+    case PAM_RHOST:
+	*item = pamh->rhost;
+	break;
+
+    case PAM_AUTHTOK:
+	/*
+	 * PAM_AUTHTOK and PAM_OLDAUTHTOK are only accessible from
+	 * modules.
+	 */
+	if (__PAM_FROM_MODULE(pamh)) {
+	    *item = pamh->authtok;
+	} else {
+	    retval = PAM_BAD_ITEM;
+	}
+	break;
+
+    case PAM_OLDAUTHTOK:
+	/*
+	 * PAM_AUTHTOK and PAM_OLDAUTHTOK are only accessible from
+	 * modules.
+	 */
+	if (__PAM_FROM_MODULE(pamh)) {
+	    *item = pamh->oldauthtok;
+	} else {
+	    retval = PAM_BAD_ITEM;
+	}
+	break;
+
+    case PAM_CONV:
+	*item = pamh->pam_conversation;
+	break;
+
+    case PAM_FAIL_DELAY:
+	*item = pamh->fail_delay.delay_fn_ptr;
+	break;
+
+    case PAM_XDISPLAY:
+	*item = pamh->xdisplay;
+	break;
+
+    case PAM_XAUTHDATA:
+	*item = &pamh->xauth;
+	break;
+
+    case PAM_AUTHTOK_TYPE:
+	*item = pamh->authtok_type;
+	break;
+
+    default:
+	retval = PAM_BAD_ITEM;
+    }
+
+    return retval;
+}
+
+/*
+ * This function is the 'preferred method to obtain the username'.
+ */
+
+int pam_get_user(pam_handle_t *pamh, const char **user, const char *prompt)
+{
+    const char *use_prompt;
+    int retval;
+    struct pam_message msg;
+    const struct pam_message *pmsg;
+    struct pam_response *resp;
+
+    D(("called."));
+
+    IF_NO_PAMH("pam_get_user", pamh, PAM_SYSTEM_ERR);
+
+    if (user == NULL) {
+        /* ensure that the module has supplied a destination */
+	pam_syslog(pamh, LOG_ERR, "pam_get_user: nowhere to record username");
+	return PAM_SYSTEM_ERR;
+    } else
+	*user = NULL;
+
+    if (pamh->pam_conversation == NULL) {
+	pam_syslog(pamh, LOG_ERR, "pam_get_user: no conv element in pamh");
+	return PAM_SYSTEM_ERR;
+    }
+
+    if (pamh->user) {    /* have one so return it */
+	*user = pamh->user;
+	return PAM_SUCCESS;
+    }
+
+    if (pamh->former.fail_user != PAM_SUCCESS)
+	return pamh->former.fail_user;
+
+    /* will need a prompt */
+    if (prompt != NULL)
+      use_prompt = prompt;
+    else if (pamh->prompt != NULL)
+      use_prompt = pamh->prompt;
+    else
+      use_prompt = _("login:");
+
+    /* If we are resuming an old conversation, we verify that the prompt
+       is the same.  Anything else is an error. */
+    if (pamh->former.want_user) {
+	/* must have a prompt to resume with */
+	if (! pamh->former.prompt) {
+	    pam_syslog(pamh, LOG_ERR,
+		       "pam_get_user: failed to resume with prompt"
+			);
+	    return PAM_ABORT;
+	}
+
+	/* must be the same prompt as last time */
+	if (strcmp(pamh->former.prompt, use_prompt)) {
+	    pam_syslog(pamh, LOG_ERR,
+		       "pam_get_user: resumed with different prompt");
+	    return PAM_ABORT;
+	}
+
+	/* ok, we can resume where we left off last time */
+	pamh->former.want_user = PAM_FALSE;
+	_pam_overwrite(pamh->former.prompt);
+	_pam_drop(pamh->former.prompt);
+    }
+
+    /* converse with application -- prompt user for a username */
+    pmsg = &msg;
+    msg.msg_style = PAM_PROMPT_ECHO_ON;
+    msg.msg = use_prompt;
+    resp = NULL;
+
+    retval = pamh->pam_conversation->
+	conv(1, &pmsg, &resp, pamh->pam_conversation->appdata_ptr);
+
+    switch (retval) {
+	case PAM_SUCCESS:
+	case PAM_BUF_ERR:
+	case PAM_CONV_AGAIN:
+	case PAM_CONV_ERR:
+	    break;
+	default:
+	    retval = PAM_CONV_ERR;
+    }
+
+    switch (retval) {
+	case PAM_CONV_AGAIN:
+	    /* conversation function is waiting for an event - save state */
+	    D(("conversation function is not ready yet"));
+	    pamh->former.want_user = PAM_TRUE;
+	    pamh->former.prompt = _pam_strdup(use_prompt);
+	    break;
+	case PAM_SUCCESS:
+	    if (resp != NULL && resp->resp != NULL) {
+		/*
+		 * now we set the PAM_USER item -- this was missing from pre.53
+		 * releases. However, reading the Sun manual, it is part of
+		 * the standard API.
+		 */
+		retval = pam_set_item(pamh, PAM_USER, resp->resp);
+		*user = pamh->user;
+		break;
+	    } else {
+		/* conversation should have given a response */
+		D(("pam_get_user: no response provided"));
+		retval = PAM_CONV_ERR;
+	    }
+	    /* fallthrough */
+	default:
+	    pamh->former.fail_user = retval;
+    }
+
+    if (resp) {
+	if (retval != PAM_SUCCESS)
+	    pam_syslog(pamh, LOG_WARNING,
+		       "unexpected response from failed conversation function");
+	/*
+	 * note 'resp' is allocated by the application and is
+         * correctly free()'d here
+	 */
+	_pam_drop_reply(resp, 1);
+    }
+
+    D(("completed"));
+    return retval;        /* pass on any error from conversation */
+}
diff --git a/libpam/pam_misc.c b/libpam/pam_misc.c
new file mode 100644
index 0000000..996f23c
--- /dev/null
+++ b/libpam/pam_misc.c
@@ -0,0 +1,360 @@
+/* pam_misc.c -- This is random stuff
+ *
+ * Copyright (c) Andrew G. Morgan <morgan@kernel.org> 2000-2003
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "pam_private.h"
+
+#include <stdarg.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <syslog.h>
+#include <ctype.h>
+
+char *_pam_StrTok(char *from, const char *format, char **next)
+/*
+ * this function is a variant of the standard strtok, it differs in that
+ * it takes an additional argument and doesn't nul terminate tokens until
+ * they are actually reached.
+ */
+{
+     char table[256], *end;
+     int i;
+
+     if (from == NULL && (from = *next) == NULL)
+	  return from;
+
+     /* initialize table */
+     for (i=1; i<256; table[i++] = '\0');
+     for (i=0; format[i] ;
+	  table[(unsigned char)format[i++]] = 'y');
+
+     /* look for first non-format char */
+     while (*from && table[(unsigned char)*from]) {
+	  ++from;
+     }
+
+     if (*from == '[') {
+	 /*
+	  * special case, "[...]" is considered to be a single
+	  * object.  Note, however, if one of the format[] chars is
+	  * '[' this single string will not be read correctly.
+	  * Note, any '[' inside the outer "[...]" pair will survive.
+	  * Note, the first ']' will terminate this string, but
+	  *  that "\]" will get compressed into "]". That is:
+	  *
+	  *   "[..[..\]..]..." --> "..[..].."
+	  */
+	 char *to;
+	 for (to=end=++from; *end && *end != ']'; ++to, ++end) {
+	     if (*end == '\\' && end[1] == ']')
+		 ++end;
+	     if (to != end) {
+		 *to = *end;
+	     }
+	 }
+	 if (to != end) {
+	     *to = '\0';
+	 }
+	 /* note, this string is stripped of its edges: "..." is what
+            remains */
+     } else if (*from) {
+	 /* simply look for next blank char */
+	 for (end=from; *end && !table[(unsigned char)*end]; ++end);
+     } else {
+	 return (*next = NULL);                    /* no tokens left */
+     }
+
+     /* now terminate what we have */
+     if (*end)
+	 *end++ = '\0';
+
+     /* indicate what it left */
+     if (*end) {
+	 *next = end;
+     } else {
+	 *next = NULL;                      /* have found last token */
+     }
+
+     /* return what we have */
+     return from;
+}
+
+/*
+ * Safe duplication of character strings. "Paranoid"; don't leave
+ * evidence of old token around for later stack analysis.
+ */
+
+char *_pam_strdup(const char *x)
+{
+     register char *new=NULL;
+
+     if (x != NULL) {
+	  register int len;
+
+	  len = strlen (x) + 1;  /* length of string including NUL */
+	  if ((new = malloc(len)) == NULL) {
+	       len = 0;
+	       pam_syslog(NULL, LOG_CRIT, "_pam_strdup: failed to get memory");
+	  } else {
+	       strcpy (new, x);
+	  }
+	  x = NULL;
+     }
+
+     return new;                 /* return the duplicate or NULL on error */
+}
+
+/*
+ * Safe duplication of memory buffers. "Paranoid"; don't leave
+ * evidence of old token around for later stack analysis.
+ */
+
+char *_pam_memdup(const char *x, int len)
+{
+     register char *new=NULL;
+
+     if (x != NULL) {
+         if ((new = malloc(len)) == NULL) {
+             len = 0;
+             pam_syslog(NULL, LOG_CRIT, "_pam_memdup: failed to get memory");
+         } else {
+             memcpy (new, x, len);
+         }
+         x = NULL;
+     }
+
+     return new;                 /* return the duplicate or NULL on error */
+}
+
+/* Generate argv, argc from s */
+/* caller must free(argv)     */
+
+int _pam_mkargv(const char *s, char ***argv, int *argc)
+{
+    int l;
+    int argvlen = 0;
+    char *sbuf, *sbuf_start;
+    char **our_argv = NULL;
+    char **argvbuf;
+    char *argvbufp;
+#ifdef PAM_DEBUG
+    int count=0;
+#endif
+
+    D(("_pam_mkargv called: %s",s));
+
+    *argc = 0;
+
+    l = strlen(s);
+    if (l) {
+	if ((sbuf = sbuf_start = _pam_strdup(s)) == NULL) {
+	    pam_syslog(NULL, LOG_CRIT,
+		       "pam_mkargv: null returned by _pam_strdup");
+	    D(("arg NULL"));
+	} else {
+	    /* Overkill on the malloc, but not large */
+	    argvlen = (l + 1) * ((sizeof(char)) + sizeof(char *));
+	    if ((our_argv = argvbuf = malloc(argvlen)) == NULL) {
+		pam_syslog(NULL, LOG_CRIT,
+			   "pam_mkargv: null returned by malloc");
+	    } else {
+		char *tmp=NULL;
+
+		argvbufp = (char *) argvbuf + (l * sizeof(char *));
+		D(("[%s]",sbuf));
+		while ((sbuf = _pam_StrTok(sbuf, " \n\t", &tmp))) {
+		    D(("arg #%d",++count));
+		    D(("->[%s]",sbuf));
+		    strcpy(argvbufp, sbuf);
+		    D(("copied token"));
+		    *argvbuf = argvbufp;
+		    argvbufp += strlen(argvbufp) + 1;
+		    D(("stepped in argvbufp"));
+		    (*argc)++;
+		    argvbuf++;
+		    sbuf = NULL;
+		    D(("loop again?"));
+		}
+	    }
+	    _pam_drop(sbuf_start);
+	}
+    }
+
+    *argv = our_argv;
+
+    D(("_pam_mkargv returned"));
+
+    return(argvlen);
+}
+
+/*
+ * this function is used to protect the modules from accidental or
+ * semi-mallicious harm that an application may do to confuse the API.
+ */
+
+void _pam_sanitize(pam_handle_t *pamh)
+{
+    int old_caller_is = pamh->caller_is;
+
+    /*
+     * this is for security. We reset the auth-tokens here.
+     */
+    __PAM_TO_MODULE(pamh);
+    pam_set_item(pamh, PAM_AUTHTOK, NULL);
+    pam_set_item(pamh, PAM_OLDAUTHTOK, NULL);
+    pamh->caller_is = old_caller_is;
+}
+
+/*
+ * This function scans the array and replaces the _PAM_ACTION_UNDEF
+ * entries with the default action.
+ */
+
+void _pam_set_default_control(int *control_array, int default_action)
+{
+    int i;
+
+    for (i=0; i<_PAM_RETURN_VALUES; ++i) {
+	if (control_array[i] == _PAM_ACTION_UNDEF) {
+	    control_array[i] = default_action;
+	}
+    }
+}
+
+/*
+ * This function is used to parse a control string.  This string is a
+ * series of tokens of the following form:
+ *
+ *               "[ ]*return_code[ ]*=[ ]*action/[ ]".
+ */
+
+#include "pam_tokens.h"
+
+void _pam_parse_control(int *control_array, char *tok)
+{
+    const char *error;
+    int ret;
+
+    while (*tok) {
+	int act, len;
+
+	/* skip leading space */
+	while (isspace((int)*tok) && *++tok);
+	if (!*tok)
+	    break;
+
+	/* identify return code */
+	for (ret=0; ret<=_PAM_RETURN_VALUES; ++ret) {
+	    len = strlen(_pam_token_returns[ret]);
+	    if (!strncmp(_pam_token_returns[ret], tok, len)) {
+		break;
+	    }
+	}
+	if (ret > _PAM_RETURN_VALUES || !*(tok += len)) {
+	    error = "expecting return value";
+	    goto parse_error;
+	}
+
+	/* observe '=' */
+	while (isspace((int)*tok) && *++tok);
+	if (!*tok || *tok++ != '=') {
+	    error = "expecting '='";
+	    goto parse_error;
+	}
+
+	/* skip leading space */
+	while (isspace((int)*tok) && *++tok);
+	if (!*tok) {
+	    error = "expecting action";
+	    goto parse_error;
+	}
+
+	/* observe action type */
+	for (act=0; act < (-(_PAM_ACTION_UNDEF)); ++act) {
+	    len = strlen(_pam_token_actions[act]);
+	    if (!strncmp(_pam_token_actions[act], tok, len)) {
+		act *= -1;
+		tok += len;
+		break;
+	    }
+	}
+	if (act > 0) {
+	    /*
+	     * Either we have a number or we have hit an error.  In
+	     * principle, there is nothing to stop us accepting
+	     * negative offsets. (Although we would have to think of
+	     * another way of encoding the tokens.)  However, I really
+	     * think this would be both hard to administer and easily
+	     * cause looping problems.  So, for now, we will just
+	     * allow forward jumps.  (AGM 1998/1/7)
+	     */
+	    if (!isdigit((int)*tok)) {
+		error = "expecting jump number";
+		goto parse_error;
+	    }
+	    /* parse a number */
+	    act = 0;
+	    do {
+		act *= 10;
+		act += *tok - '0';      /* XXX - this assumes ascii behavior */
+	    } while (*++tok && isdigit((int)*tok));
+	    if (! act) {
+		/* we do not allow 0 jumps.  There is a token ('ignore')
+                   for that */
+		error = "expecting non-zero";
+		goto parse_error;
+	    }
+	}
+
+	/* set control_array element */
+	if (ret != _PAM_RETURN_VALUES) {
+	    control_array[ret] = act;
+	} else {
+	    /* set the default to 'act' */
+	    _pam_set_default_control(control_array, act);
+	}
+    }
+
+    /* that was a success */
+    return;
+
+parse_error:
+    /* treat everything as bad */
+    pam_syslog(NULL, LOG_ERR, "pam_parse: %s; [...%s]", error, tok);
+    for (ret=0; ret<_PAM_RETURN_VALUES; control_array[ret++]=_PAM_ACTION_BAD);
+
+}
diff --git a/libpam/pam_modutil_check_user.c b/libpam/pam_modutil_check_user.c
new file mode 100644
index 0000000..cf1bd1b
--- /dev/null
+++ b/libpam/pam_modutil_check_user.c
@@ -0,0 +1,92 @@
+#include "pam_modutil_private.h"
+#include <security/pam_ext.h>
+
+#include <stdio.h>
+#include <string.h>
+#include <syslog.h>
+
+int
+pam_modutil_check_user_in_passwd(pam_handle_t *pamh,
+				 const char *user_name,
+				 const char *file_name)
+{
+	int rc;
+	size_t user_len;
+	FILE *fp;
+	char line[BUFSIZ];
+
+	/* Validate the user name.  */
+	if ((user_len = strlen(user_name)) == 0) {
+		pam_syslog(pamh, LOG_NOTICE, "user name is not valid");
+		return PAM_SERVICE_ERR;
+	}
+
+	if (user_len > sizeof(line) - sizeof(":")) {
+		pam_syslog(pamh, LOG_NOTICE, "user name is too long");
+		return PAM_SERVICE_ERR;
+	}
+
+	if (strchr(user_name, ':') != NULL) {
+		/*
+		 * "root:x" is not a local user name even if the passwd file
+		 * contains a line starting with "root:x:".
+		 */
+		return PAM_PERM_DENIED;
+	}
+
+	/* Open the passwd file.  */
+	if (file_name == NULL) {
+		file_name = "/etc/passwd";
+	}
+	if ((fp = fopen(file_name, "r")) == NULL) {
+		pam_syslog(pamh, LOG_ERR, "error opening %s: %m", file_name);
+		return PAM_SERVICE_ERR;
+	}
+
+	/*
+	 * Scan the file using fgets() instead of fgetpwent_r() because
+	 * the latter is not flexible enough in handling long lines
+	 * in passwd files.
+	 */
+	rc = PAM_PERM_DENIED;
+	while (fgets(line, sizeof(line), fp) != NULL) {
+		size_t line_len;
+		const char *str;
+
+		/*
+		 * Does this line start with the user name
+		 * followed by a colon?
+		 */
+		if (strncmp(user_name, line, user_len) == 0 &&
+		    line[user_len] == ':') {
+			rc = PAM_SUCCESS;
+			/*
+			 * Continue reading the file to avoid timing attacks.
+			 */
+		}
+		/* Has a newline been read?  */
+		line_len = strlen(line);
+		if (line_len < sizeof(line) - 1 ||
+		    line[line_len - 1] == '\n') {
+			/* Yes, continue with the next line.  */
+			continue;
+		}
+
+		/* No, read till the end of this line first.  */
+		while ((str = fgets(line, sizeof(line), fp)) != NULL) {
+			line_len = strlen(line);
+			if (line_len == 0 ||
+			    line[line_len - 1] == '\n') {
+				break;
+			}
+		}
+		if (str == NULL) {
+			/* fgets returned NULL, we are done.  */
+			break;
+		}
+		/* Continue with the next line.  */
+	}
+
+	fclose(fp);
+	return rc;
+}
diff --git a/libpam/pam_modutil_cleanup.c b/libpam/pam_modutil_cleanup.c
new file mode 100644
index 0000000..8224ce6
--- /dev/null
+++ b/libpam/pam_modutil_cleanup.c
@@ -0,0 +1,19 @@
+/*
+ * $Id$
+ *
+ * This function provides a common pam_set_data() friendly version of free().
+ */
+
+#include "pam_modutil_private.h"
+
+#include <stdlib.h>
+
+void
+pam_modutil_cleanup (pam_handle_t *pamh UNUSED, void *data,
+		     int error_status UNUSED)
+{
+    if (data) {
+	/* junk it */
+	(void) free(data);
+    }
+}
diff --git a/libpam/pam_modutil_getgrgid.c b/libpam/pam_modutil_getgrgid.c
new file mode 100644
index 0000000..386d6f4
--- /dev/null
+++ b/libpam/pam_modutil_getgrgid.c
@@ -0,0 +1,138 @@
+/*
+ * $Id$
+ *
+ * This function provides a thread safer version of getgrgid() for use
+ * with PAM modules that care about this sort of thing.
+ *
+ * XXX - or at least it should provide a thread-safe alternative.
+ */
+
+#include "pam_modutil_private.h"
+
+#include <errno.h>
+#include <limits.h>
+#include <grp.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static int intlen(int number)
+{
+    int len = 2;
+    while (number != 0) {
+        number /= 10;
+	len++;
+    }
+    return len;
+}
+
+static int longlen(long number)
+{
+    int len = 2;
+    while (number != 0) {
+        number /= 10;
+	len++;
+    }
+    return len;
+}
+
+struct group *
+pam_modutil_getgrgid(pam_handle_t *pamh, gid_t gid)
+{
+#ifdef HAVE_GETGRGID_R
+
+    void *buffer=NULL;
+    size_t length = PWD_INITIAL_LENGTH;
+
+    do {
+	int status;
+	void *new_buffer;
+	struct group *result = NULL;
+
+	new_buffer = realloc(buffer, sizeof(struct group) + length);
+	if (new_buffer == NULL) {
+
+	    D(("out of memory"));
+
+	    /* no memory for the user - so delete the memory */
+	    if (buffer) {
+		free(buffer);
+	    }
+	    return NULL;
+	}
+	buffer = new_buffer;
+
+	/* make the re-entrant call to get the grp structure */
+	errno = 0;
+	status = getgrgid_r(gid, buffer,
+			    sizeof(struct group) + (char *) buffer,
+			    length, &result);
+	if (!status && (result == buffer)) {
+	    char *data_name;
+	    const void *ignore;
+	    int i;
+
+	    data_name = malloc(strlen("_pammodutil_getgrgid") + 1 +
+			       longlen((long)gid) + 1 + intlen(INT_MAX) + 1);
+	    if ((pamh != NULL) && (data_name == NULL)) {
+	        D(("was unable to register the data item [%s]",
+	           pam_strerror(pamh, status)));
+		free(buffer);
+		return NULL;
+	    }
+
+	    if (pamh != NULL) {
+	        for (i = 0; i < INT_MAX; i++) {
+	            sprintf(data_name, "_pammodutil_getgrgid_%ld_%d",
+			    (long) gid, i);
+		    status = PAM_NO_MODULE_DATA;
+	            if (pam_get_data(pamh, data_name, &ignore) != PAM_SUCCESS) {
+		        status = pam_set_data(pamh, data_name,
+					      result, pam_modutil_cleanup);
+		    }
+		    if (status == PAM_SUCCESS) {
+		        break;
+		    }
+		}
+	    } else {
+	        status = PAM_SUCCESS;
+	    }
+
+	    free(data_name);
+
+	    if (status == PAM_SUCCESS) {
+		D(("success"));
+		return result;
+	    }
+
+	    D(("was unable to register the data item [%s]",
+	       pam_strerror(pamh, status)));
+
+	    free(buffer);
+	    return NULL;
+
+	} else if (errno != ERANGE && errno != EINTR) {
+		/* no sense in repeating the call */
+		break;
+	}
+
+	length <<= PWD_LENGTH_SHIFT;
+
+    } while (length < PWD_ABSURD_PWD_LENGTH);
+
+    D(("grp structure took %u bytes or so of memory",
+       length+sizeof(struct group)));
+
+    free(buffer);
+    return NULL;
+
+#else /* ie. ifndef HAVE_GETGRGID_R */
+
+    /*
+     * Sorry, there does not appear to be a reentrant version of
+     * getgrgid(). So, we use the standard libc function.
+     */
+
+    return getgrgid(gid);
+
+#endif /* def HAVE_GETGRGID_R */
+}
diff --git a/libpam/pam_modutil_getgrnam.c b/libpam/pam_modutil_getgrnam.c
new file mode 100644
index 0000000..cbb1551
--- /dev/null
+++ b/libpam/pam_modutil_getgrnam.c
@@ -0,0 +1,127 @@
+/*
+ * $Id$
+ *
+ * This function provides a thread safer version of getgrnam() for use
+ * with PAM modules that care about this sort of thing.
+ *
+ * XXX - or at least it should provide a thread-safe alternative.
+ */
+
+#include "pam_modutil_private.h"
+
+#include <errno.h>
+#include <limits.h>
+#include <grp.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static int intlen(int number)
+{
+    int len = 2;
+    while (number != 0) {
+        number /= 10;
+	len++;
+    }
+    return len;
+}
+
+struct group *
+pam_modutil_getgrnam(pam_handle_t *pamh, const char *group)
+{
+#ifdef HAVE_GETGRNAM_R
+
+    void *buffer=NULL;
+    size_t length = PWD_INITIAL_LENGTH;
+
+    do {
+	int status;
+	void *new_buffer;
+	struct group *result = NULL;
+
+	new_buffer = realloc(buffer, sizeof(struct group) + length);
+	if (new_buffer == NULL) {
+
+	    D(("out of memory"));
+
+	    /* no memory for the group - so delete the memory */
+	    if (buffer) {
+		free(buffer);
+	    }
+	    return NULL;
+	}
+	buffer = new_buffer;
+
+	/* make the re-entrant call to get the grp structure */
+	errno = 0;
+	status = getgrnam_r(group, buffer,
+			    sizeof(struct group) + (char *) buffer,
+			    length, &result);
+	if (!status && (result == buffer)) {
+	    char *data_name;
+	    const void *ignore;
+	    int i;
+
+	    data_name = malloc(strlen("_pammodutil_getgrnam") + 1 +
+			       strlen(group) + 1 + intlen(INT_MAX) + 1);
+	    if ((pamh != NULL) && (data_name == NULL)) {
+	        D(("was unable to register the data item [%s]",
+	           pam_strerror(pamh, status)));
+		free(buffer);
+		return NULL;
+	    }
+
+	    if (pamh != NULL) {
+	        for (i = 0; i < INT_MAX; i++) {
+	            sprintf(data_name, "_pammodutil_getgrnam_%s_%d", group, i);
+		    status = PAM_NO_MODULE_DATA;
+	            if (pam_get_data(pamh, data_name, &ignore) != PAM_SUCCESS) {
+		        status = pam_set_data(pamh, data_name,
+					      result, pam_modutil_cleanup);
+		    }
+		    if (status == PAM_SUCCESS) {
+		        break;
+		    }
+		}
+	    } else {
+	        status = PAM_SUCCESS;
+	    }
+
+	    free(data_name);
+
+	    if (status == PAM_SUCCESS) {
+		D(("success"));
+		return result;
+	    }
+
+	    D(("was unable to register the data item [%s]",
+	       pam_strerror(pamh, status)));
+
+	    free(buffer);
+	    return NULL;
+
+	} else if (errno != ERANGE && errno != EINTR) {
+                /* no sense in repeating the call */
+                break;
+        }
+
+	length <<= PWD_LENGTH_SHIFT;
+
+    } while (length < PWD_ABSURD_PWD_LENGTH);
+
+    D(("grp structure took %u bytes or so of memory",
+       length+sizeof(struct group)));
+
+    free(buffer);
+    return NULL;
+
+#else /* ie. ifndef HAVE_GETGRNAM_R */
+
+    /*
+     * Sorry, there does not appear to be a reentrant version of
+     * getgrnam(). So, we use the standard libc function.
+     */
+
+    return getgrnam(group);
+
+#endif /* def HAVE_GETGRNAM_R */
+}
diff --git a/libpam/pam_modutil_getlogin.c b/libpam/pam_modutil_getlogin.c
new file mode 100644
index 0000000..04a20fd
--- /dev/null
+++ b/libpam/pam_modutil_getlogin.c
@@ -0,0 +1,80 @@
+/*
+ * $Id$
+ *
+ * A central point for invoking getlogin(). Hopefully, this is a
+ * little harder to spoof than all the other versions that are out
+ * there.
+ */
+
+#include "pam_modutil_private.h"
+
+#include <stdlib.h>
+#include <unistd.h>
+#include <utmp.h>
+
+#define _PAMMODUTIL_GETLOGIN "_pammodutil_getlogin"
+
+const char *
+pam_modutil_getlogin(pam_handle_t *pamh)
+{
+    int status;
+    const void *logname;
+    const void *void_curr_tty;
+    const char *curr_tty;
+    char *curr_user;
+    struct utmp *ut, line;
+
+    status = pam_get_data(pamh, _PAMMODUTIL_GETLOGIN, &logname);
+    if (status == PAM_SUCCESS) {
+	return logname;
+    }
+
+    status = pam_get_item(pamh, PAM_TTY, &void_curr_tty);
+    if ((status != PAM_SUCCESS) || (void_curr_tty == NULL))
+      curr_tty = ttyname(0);
+    else
+      curr_tty = (const char*)void_curr_tty;
+
+    if (curr_tty == NULL) {
+	return NULL;
+    }
+
+    if (curr_tty[0] == '/') {   /* full path */
+        const char *t;
+	curr_tty++;
+	if ((t = strchr(curr_tty, '/')) != NULL) {
+	  curr_tty = t + 1;
+	}
+    }
+    logname = NULL;
+
+    setutent();
+    strncpy(line.ut_line, curr_tty, sizeof(line.ut_line));
+
+    if ((ut = getutline(&line)) == NULL) {
+	goto clean_up_and_go_home;
+    }
+
+    curr_user = calloc(sizeof(line.ut_user)+1, 1);
+    if (curr_user == NULL) {
+	goto clean_up_and_go_home;
+    }
+
+    strncpy(curr_user, ut->ut_user, sizeof(ut->ut_user));
+    /* calloc already zeroed the memory */
+
+    status = pam_set_data(pamh, _PAMMODUTIL_GETLOGIN, curr_user,
+			  pam_modutil_cleanup);
+    if (status != PAM_SUCCESS) {
+	free(curr_user);
+	goto clean_up_and_go_home;
+    }
+
+    logname = curr_user;
+
+clean_up_and_go_home:
+
+    endutent();
+
+    return logname;
+}
diff --git a/libpam/pam_modutil_getpwnam.c b/libpam/pam_modutil_getpwnam.c
new file mode 100644
index 0000000..8132c76
--- /dev/null
+++ b/libpam/pam_modutil_getpwnam.c
@@ -0,0 +1,127 @@
+/*
+ * $Id$
+ *
+ * This function provides a thread safer version of getpwnam() for use
+ * with PAM modules that care about this sort of thing.
+ *
+ * XXX - or at least it should provide a thread-safe alternative.
+ */
+
+#include "pam_modutil_private.h"
+
+#include <errno.h>
+#include <limits.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static int intlen(int number)
+{
+    int len = 2;
+    while (number != 0) {
+        number /= 10;
+	len++;
+    }
+    return len;
+}
+
+struct passwd *
+pam_modutil_getpwnam(pam_handle_t *pamh, const char *user)
+{
+#ifdef HAVE_GETPWNAM_R
+
+    void *buffer=NULL;
+    size_t length = PWD_INITIAL_LENGTH;
+
+    do {
+	int status;
+	void *new_buffer;
+	struct passwd *result = NULL;
+
+	new_buffer = realloc(buffer, sizeof(struct passwd) + length);
+	if (new_buffer == NULL) {
+
+	    D(("out of memory"));
+
+	    /* no memory for the user - so delete the memory */
+	    if (buffer) {
+		free(buffer);
+	    }
+	    return NULL;
+	}
+	buffer = new_buffer;
+
+	/* make the re-entrant call to get the pwd structure */
+	errno = 0;
+	status = getpwnam_r(user, buffer,
+			    sizeof(struct passwd) + (char *) buffer,
+			    length, &result);
+	if (!status && (result == buffer)) {
+	    char *data_name;
+	    const void *ignore;
+	    int i;
+
+	    data_name = malloc(strlen("_pammodutil_getpwnam") + 1 +
+			       strlen(user) + 1 + intlen(INT_MAX) + 1);
+	    if ((pamh != NULL) && (data_name == NULL)) {
+	        D(("was unable to register the data item [%s]",
+	           pam_strerror(pamh, status)));
+		free(buffer);
+		return NULL;
+	    }
+
+	    if (pamh != NULL) {
+	        for (i = 0; i < INT_MAX; i++) {
+	            sprintf(data_name, "_pammodutil_getpwnam_%s_%d", user, i);
+		    status = PAM_NO_MODULE_DATA;
+	            if (pam_get_data(pamh, data_name, &ignore) != PAM_SUCCESS) {
+		        status = pam_set_data(pamh, data_name,
+					      result, pam_modutil_cleanup);
+		    }
+		    if (status == PAM_SUCCESS) {
+		        break;
+		    }
+		}
+	    } else {
+	        status = PAM_SUCCESS;
+	    }
+
+	    free(data_name);
+
+	    if (status == PAM_SUCCESS) {
+		D(("success"));
+		return result;
+	    }
+
+	    D(("was unable to register the data item [%s]",
+	       pam_strerror(pamh, status)));
+
+	    free(buffer);
+	    return NULL;
+
+	} else if (errno != ERANGE && errno != EINTR) {
+                /* no sense in repeating the call */
+                break;
+        }
+
+	length <<= PWD_LENGTH_SHIFT;
+
+    } while (length < PWD_ABSURD_PWD_LENGTH);
+
+    D(("pwd structure took %u bytes or so of memory",
+       length+sizeof(struct passwd)));
+
+    free(buffer);
+    return NULL;
+
+#else /* ie. ifndef HAVE_GETPWNAM_R */
+
+    /*
+     * Sorry, there does not appear to be a reentrant version of
+     * getpwnam(). So, we use the standard libc function.
+     */
+
+    return getpwnam(user);
+
+#endif /* def HAVE_GETPWNAM_R */
+}
diff --git a/libpam/pam_modutil_getpwuid.c b/libpam/pam_modutil_getpwuid.c
new file mode 100644
index 0000000..3a43593
--- /dev/null
+++ b/libpam/pam_modutil_getpwuid.c
@@ -0,0 +1,138 @@
+/*
+ * $Id$
+ *
+ * This function provides a thread safer version of getpwuid() for use
+ * with PAM modules that care about this sort of thing.
+ *
+ * XXX - or at least it should provide a thread-safe alternative.
+ */
+
+#include "pam_modutil_private.h"
+
+#include <errno.h>
+#include <limits.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static int intlen(int number)
+{
+    int len = 2;
+    while (number != 0) {
+        number /= 10;
+	len++;
+    }
+    return len;
+}
+
+static int longlen(long number)
+{
+    int len = 2;
+    while (number != 0) {
+        number /= 10;
+	len++;
+    }
+    return len;
+}
+
+struct passwd *
+pam_modutil_getpwuid(pam_handle_t *pamh, uid_t uid)
+{
+#ifdef HAVE_GETPWUID_R
+
+    void *buffer=NULL;
+    size_t length = PWD_INITIAL_LENGTH;
+
+    do {
+	int status;
+	void *new_buffer;
+	struct passwd *result = NULL;
+
+	new_buffer = realloc(buffer, sizeof(struct passwd) + length);
+	if (new_buffer == NULL) {
+
+	    D(("out of memory"));
+
+	    /* no memory for the user - so delete the memory */
+	    if (buffer) {
+		free(buffer);
+	    }
+	    return NULL;
+	}
+	buffer = new_buffer;
+
+	/* make the re-entrant call to get the pwd structure */
+        errno = 0;
+	status = getpwuid_r(uid, buffer,
+			    sizeof(struct passwd) + (char *) buffer,
+			    length, &result);
+	if (!status && (result == buffer)) {
+	    char *data_name;
+	    const void *ignore;
+	    int i;
+
+	    data_name = malloc(strlen("_pammodutil_getpwuid") + 1 +
+			       longlen((long) uid) + 1 + intlen(INT_MAX) + 1);
+	    if ((pamh != NULL) && (data_name == NULL)) {
+	        D(("was unable to register the data item [%s]",
+	           pam_strerror(pamh, status)));
+		free(buffer);
+		return NULL;
+	    }
+
+	    if (pamh != NULL) {
+	        for (i = 0; i < INT_MAX; i++) {
+	            sprintf(data_name, "_pammodutil_getpwuid_%ld_%d",
+			    (long) uid, i);
+		    status = PAM_NO_MODULE_DATA;
+	            if (pam_get_data(pamh, data_name, &ignore) != PAM_SUCCESS) {
+		        status = pam_set_data(pamh, data_name,
+					      result, pam_modutil_cleanup);
+		    }
+		    if (status == PAM_SUCCESS) {
+		        break;
+		    }
+		}
+	    } else {
+	        status = PAM_SUCCESS;
+	    }
+
+	    free(data_name);
+
+	    if (status == PAM_SUCCESS) {
+		D(("success"));
+		return result;
+	    }
+
+	    D(("was unable to register the data item [%s]",
+	       pam_strerror(pamh, status)));
+
+	    free(buffer);
+	    return NULL;
+
+	} else if (errno != ERANGE && errno != EINTR) {
+                /* no sense in repeating the call */
+                break;
+        }
+
+	length <<= PWD_LENGTH_SHIFT;
+
+    } while (length < PWD_ABSURD_PWD_LENGTH);
+
+    D(("pwd structure took %u bytes or so of memory",
+       length+sizeof(struct passwd)));
+
+    free(buffer);
+    return NULL;
+
+#else /* ie. ifndef HAVE_GETPWUID_R */
+
+    /*
+     * Sorry, there does not appear to be a reentrant version of
+     * getpwuid(). So, we use the standard libc function.
+     */
+
+    return getpwuid(uid);
+
+#endif /* def HAVE_GETPWUID_R */
+}
diff --git a/libpam/pam_modutil_getspnam.c b/libpam/pam_modutil_getspnam.c
new file mode 100644
index 0000000..032709e
--- /dev/null
+++ b/libpam/pam_modutil_getspnam.c
@@ -0,0 +1,127 @@
+/*
+ * $Id$
+ *
+ * This function provides a thread safer version of getspnam() for use
+ * with PAM modules that care about this sort of thing.
+ *
+ * XXX - or at least it should provide a thread-safe alternative.
+ */
+
+#include "pam_modutil_private.h"
+
+#include <errno.h>
+#include <limits.h>
+#include <shadow.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+static int intlen(int number)
+{
+    int len = 2;
+    while (number != 0) {
+        number /= 10;
+	len++;
+    }
+    return len;
+}
+
+struct spwd *
+pam_modutil_getspnam(pam_handle_t *pamh, const char *user)
+{
+#ifdef HAVE_GETSPNAM_R
+
+    void *buffer=NULL;
+    size_t length = PWD_INITIAL_LENGTH;
+
+    do {
+	int status;
+	void *new_buffer;
+	struct spwd *result = NULL;
+
+	new_buffer = realloc(buffer, sizeof(struct spwd) + length);
+	if (new_buffer == NULL) {
+
+	    D(("out of memory"));
+
+	    /* no memory for the user - so delete the memory */
+	    if (buffer) {
+		free(buffer);
+	    }
+	    return NULL;
+	}
+	buffer = new_buffer;
+
+	/* make the re-entrant call to get the spwd structure */
+        errno = 0;
+	status = getspnam_r(user, buffer,
+			    sizeof(struct spwd) + (char *) buffer,
+			    length, &result);
+	if (!status && (result == buffer)) {
+	    char *data_name;
+	    const void *ignore;
+	    int i;
+
+	    data_name = malloc(strlen("_pammodutil_getspnam") + 1 +
+			       strlen(user) + 1 + intlen(INT_MAX) + 1);
+	    if ((pamh != NULL) && (data_name == NULL)) {
+	        D(("was unable to register the data item [%s]",
+	           pam_strerror(pamh, status)));
+		free(buffer);
+		return NULL;
+	    }
+
+	    if (pamh != NULL) {
+	        for (i = 0; i < INT_MAX; i++) {
+	            sprintf(data_name, "_pammodutil_getspnam_%s_%d", user, i);
+		    status = PAM_NO_MODULE_DATA;
+	            if (pam_get_data(pamh, data_name, &ignore) != PAM_SUCCESS) {
+		        status = pam_set_data(pamh, data_name,
+					      result, pam_modutil_cleanup);
+		    }
+		    if (status == PAM_SUCCESS) {
+		        break;
+		    }
+		}
+	    } else {
+	        status = PAM_SUCCESS;
+	    }
+
+	    free(data_name);
+
+	    if (status == PAM_SUCCESS) {
+		D(("success"));
+		return result;
+	    }
+
+	    D(("was unable to register the data item [%s]",
+	       pam_strerror(pamh, status)));
+
+	    free(buffer);
+	    return NULL;
+
+	} else if (errno != ERANGE && errno != EINTR) {
+                /* no sense in repeating the call */
+                break;
+        }
+
+	length <<= PWD_LENGTH_SHIFT;
+
+    } while (length < PWD_ABSURD_PWD_LENGTH);
+
+    D(("spwd structure took %u bytes or so of memory",
+       length+sizeof(struct spwd)));
+
+    free(buffer);
+    return NULL;
+
+#else /* ie. ifndef HAVE_GETSPNAM_R */
+
+    /*
+     * Sorry, there does not appear to be a reentrant version of
+     * getspnam(). So, we use the standard libc function.
+     */
+
+    return getspnam(user);
+
+#endif /* def HAVE_GETSPNAM_R */
+}
diff --git a/libpam/pam_modutil_ingroup.c b/libpam/pam_modutil_ingroup.c
new file mode 100644
index 0000000..356302e
--- /dev/null
+++ b/libpam/pam_modutil_ingroup.c
@@ -0,0 +1,130 @@
+/*
+ * $Id$
+ *
+ * This function provides common methods for checking if a user is in a
+ * specified group.
+ */
+
+#include "pam_modutil_private.h"
+
+#include <stdlib.h>
+#include <pwd.h>
+#include <grp.h>
+
+#ifdef HAVE_GETGROUPLIST
+
+#define NGROUPS_MIN 100
+#define NGROUPS_MAX 65536
+
+static int checkgrouplist(const char *user, gid_t primary, gid_t target)
+{
+	int ngroups, pgroups, i;
+
+	ngroups = NGROUPS_MIN;
+	do {
+		gid_t *grouplist;
+
+		pgroups = ngroups;
+		grouplist = malloc(sizeof(gid_t) * ngroups);
+		if (grouplist == NULL) {
+			return 0;
+		}
+		i = getgrouplist(user, primary, grouplist, &ngroups);
+		if (i >= 0) {
+			for (i = 0; i < ngroups; i++) {
+				if (grouplist[i] == target) {
+					free(grouplist);
+					return 1;
+				}
+			}
+		}
+		free(grouplist);
+	} while (i < 0 && ngroups > 0 && ngroups != pgroups && ngroups <= NGROUPS_MAX);
+	return 0;
+}
+#endif
+
+static int
+pam_modutil_user_in_group_common(pam_handle_t *pamh UNUSED,
+				 struct passwd *pwd,
+				 struct group *grp)
+{
+	int i;
+
+	if (pwd == NULL) {
+		return 0;
+	}
+	if (grp == NULL) {
+		return 0;
+	}
+
+	if (pwd->pw_gid == grp->gr_gid) {
+		return 1;
+	}
+
+	for (i = 0; (grp->gr_mem != NULL) && (grp->gr_mem[i] != NULL); i++) {
+		if (strcmp(pwd->pw_name, grp->gr_mem[i]) == 0) {
+			return 1;
+		}
+	}
+
+#ifdef HAVE_GETGROUPLIST
+	if (checkgrouplist(pwd->pw_name, pwd->pw_gid, grp->gr_gid)) {
+		return 1;
+	}
+#endif
+
+	return 0;
+}
+
+int
+pam_modutil_user_in_group_nam_nam(pam_handle_t *pamh,
+				 const char *user, const char *group)
+{
+	struct passwd *pwd;
+	struct group *grp;
+
+	pwd = pam_modutil_getpwnam(pamh, user);
+	grp = pam_modutil_getgrnam(pamh, group);
+
+	return pam_modutil_user_in_group_common(pamh, pwd, grp);
+}
+
+int
+pam_modutil_user_in_group_nam_gid(pam_handle_t *pamh,
+				  const char *user, gid_t group)
+{
+	struct passwd *pwd;
+	struct group *grp;
+
+	pwd = pam_modutil_getpwnam(pamh, user);
+	grp = pam_modutil_getgrgid(pamh, group);
+
+	return pam_modutil_user_in_group_common(pamh, pwd, grp);
+}
+
+int
+pam_modutil_user_in_group_uid_nam(pam_handle_t *pamh,
+				  uid_t user, const char *group)
+{
+	struct passwd *pwd;
+	struct group *grp;
+
+	pwd = pam_modutil_getpwuid(pamh, user);
+	grp = pam_modutil_getgrnam(pamh, group);
+
+	return pam_modutil_user_in_group_common(pamh, pwd, grp);
+}
+
+int
+pam_modutil_user_in_group_uid_gid(pam_handle_t *pamh,
+				  uid_t user, gid_t group)
+{
+	struct passwd *pwd;
+	struct group *grp;
+
+	pwd = pam_modutil_getpwuid(pamh, user);
+	grp = pam_modutil_getgrgid(pamh, group);
+
+	return pam_modutil_user_in_group_common(pamh, pwd, grp);
+}
diff --git a/libpam/pam_modutil_ioloop.c b/libpam/pam_modutil_ioloop.c
new file mode 100644
index 0000000..54ab0e5
--- /dev/null
+++ b/libpam/pam_modutil_ioloop.c
@@ -0,0 +1,53 @@
+/*
+ * $Id$
+ *
+ * These functions provides common methods for ensure a complete read or
+ * write occurs. It handles EINTR and partial read/write returns.
+ */
+
+#include "pam_modutil_private.h"
+
+#include <unistd.h>
+#include <errno.h>
+
+int
+pam_modutil_read(int fd, char *buffer, int count)
+{
+       int block, offset = 0;
+
+       while (count > 0) {
+               block = read(fd, &buffer[offset], count);
+
+               if (block < 0) {
+                       if (errno == EINTR) continue;
+                       return block;
+               }
+               if (block == 0) return offset;
+
+               offset += block;
+               count -= block;
+       }
+
+       return offset;
+}
+
+int
+pam_modutil_write(int fd, const char *buffer, int count)
+{
+       int block, offset = 0;
+
+       while (count > 0) {
+               block = write(fd, &buffer[offset], count);
+
+               if (block < 0) {
+                       if (errno == EINTR) continue;
+                       return block;
+               }
+               if (block == 0) return offset;
+
+               offset += block;
+               count -= block;
+       }
+
+       return offset;
+}
diff --git a/libpam/pam_modutil_priv.c b/libpam/pam_modutil_priv.c
new file mode 100644
index 0000000..a463e06
--- /dev/null
+++ b/libpam/pam_modutil_priv.c
@@ -0,0 +1,179 @@
+/*
+ * $Id$
+ *
+ * This file provides two functions:
+ * pam_modutil_drop_priv:
+ *   temporarily lower process fs privileges by switching to another uid/gid,
+ * pam_modutil_regain_priv:
+ *   regain process fs privileges lowered by pam_modutil_drop_priv().
+ */
+
+#include "pam_modutil_private.h"
+#include <security/pam_ext.h>
+#include <unistd.h>
+#include <syslog.h>
+#include <pwd.h>
+#include <grp.h>
+#include <sys/fsuid.h>
+
+/*
+ * Two setfsuid() calls in a row are necessary to check
+ * whether setfsuid() succeeded or not.
+ */
+static int change_uid(uid_t uid, uid_t *save)
+{
+	uid_t tmp = setfsuid(uid);
+	if (save)
+		*save = tmp;
+	return (uid_t) setfsuid(uid) == uid ? 0 : -1;
+}
+static int change_gid(gid_t gid, gid_t *save)
+{
+	gid_t tmp = setfsgid(gid);
+	if (save)
+		*save = tmp;
+	return (gid_t) setfsgid(gid) == gid ? 0 : -1;
+}
+
+static int cleanup(struct pam_modutil_privs *p)
+{
+	if (p->allocated) {
+		p->allocated = 0;
+		free(p->grplist);
+	}
+	p->grplist = NULL;
+	p->number_of_groups = 0;
+	return -1;
+}
+
+#define PRIV_MAGIC			0x1004000a
+#define PRIV_MAGIC_DONOTHING		0xdead000a
+
+int pam_modutil_drop_priv(pam_handle_t *pamh,
+			  struct pam_modutil_privs *p,
+			  const struct passwd *pw)
+{
+	int res;
+
+	if (p->is_dropped) {
+		pam_syslog(pamh, LOG_CRIT,
+			   "pam_modutil_drop_priv: called with dropped privileges");
+		return -1;
+	}
+
+	/*
+	 * If not root, we can do nothing.
+	 * If switching to root, we have nothing to do.
+	 * That is, in both cases, we do not care.
+	 */
+	if (geteuid() != 0 || pw->pw_uid == 0) {
+		p->is_dropped = PRIV_MAGIC_DONOTHING;
+		return 0;
+	}
+
+	if (!p->grplist || p->number_of_groups <= 0) {
+		pam_syslog(pamh, LOG_CRIT,
+			   "pam_modutil_drop_priv: called without room for supplementary groups");
+		return -1;
+	}
+	res = getgroups(0, NULL);
+	if (res < 0) {
+		pam_syslog(pamh, LOG_ERR,
+			   "pam_modutil_drop_priv: getgroups failed: %m");
+		return -1;
+	}
+
+	p->allocated = 0;
+	if (res > p->number_of_groups) {
+		p->grplist = calloc(res, sizeof(gid_t));
+		if (!p->grplist) {
+			pam_syslog(pamh, LOG_CRIT, "out of memory");
+			return cleanup(p);
+		}
+		p->allocated = 1;
+		p->number_of_groups = res;
+	}
+
+	res = getgroups(p->number_of_groups, p->grplist);
+	if (res < 0) {
+		pam_syslog(pamh, LOG_ERR,
+			   "pam_modutil_drop_priv: getgroups failed: %m");
+		return cleanup(p);
+	}
+
+	p->number_of_groups = res;
+
+	/*
+	 * We should care to leave process credentials in consistent state.
+	 * That is, e.g. if change_gid() succeeded but change_uid() failed,
+	 * we should try to restore old gid.
+	 *
+	 * We try to add the supplementary groups on a best-effort
+	 * basis.  If it fails, it's not fatal: we fall back to using an
+	 * empty list.
+	 */
+	if (initgroups(pw->pw_name, pw->pw_gid)) {
+		pam_syslog(pamh, LOG_WARNING,
+			   "pam_modutil_drop_priv: initgroups failed: %m");
+
+		if (setgroups(0, NULL)) {
+			pam_syslog(pamh, LOG_ERR,
+				   "pam_modutil_drop_priv: setgroups failed: %m");
+			return cleanup(p);
+		}
+	}
+	if (change_gid(pw->pw_gid, &p->old_gid)) {
+		pam_syslog(pamh, LOG_ERR,
+			   "pam_modutil_drop_priv: change_gid failed: %m");
+		(void) setgroups(p->number_of_groups, p->grplist);
+		return cleanup(p);
+	}
+	if (change_uid(pw->pw_uid, &p->old_uid)) {
+		pam_syslog(pamh, LOG_ERR,
+			   "pam_modutil_drop_priv: change_uid failed: %m");
+		(void) change_gid(p->old_gid, NULL);
+		(void) setgroups(p->number_of_groups, p->grplist);
+		return cleanup(p);
+	}
+
+	p->is_dropped = PRIV_MAGIC;
+	return 0;
+}
+
+int pam_modutil_regain_priv(pam_handle_t *pamh,
+			  struct pam_modutil_privs *p)
+{
+	switch (p->is_dropped) {
+		case PRIV_MAGIC_DONOTHING:
+			p->is_dropped = 0;
+			return 0;
+
+		case PRIV_MAGIC:
+			break;
+
+		default:
+			pam_syslog(pamh, LOG_CRIT,
+				   "pam_modutil_regain_priv: called with invalid state");
+			return -1;
+		}
+
+	if (change_uid(p->old_uid, NULL)) {
+		pam_syslog(pamh, LOG_ERR,
+			   "pam_modutil_regain_priv: change_uid failed: %m");
+		return cleanup(p);
+	}
+	if (change_gid(p->old_gid, NULL)) {
+		pam_syslog(pamh, LOG_ERR,
+			   "pam_modutil_regain_priv: change_gid failed: %m");
+		return cleanup(p);
+	}
+	if (setgroups(p->number_of_groups, p->grplist)) {
+		pam_syslog(pamh, LOG_ERR,
+			   "pam_modutil_regain_priv: setgroups failed: %m");
+		return cleanup(p);
+	}
+
+	p->is_dropped = 0;
+	cleanup(p);
+	return 0;
+}
diff --git a/libpam/pam_modutil_private.h b/libpam/pam_modutil_private.h
new file mode 100644
index 0000000..98a30f6
--- /dev/null
+++ b/libpam/pam_modutil_private.h
@@ -0,0 +1,24 @@
+#ifndef PAMMODUTIL_PRIVATE_H
+#define PAMMODUTIL_PRIVATE_H
+
+/*
+ * $Id$
+ *
+ * Copyright (c) 2001 Andrew Morgan <morgan@kernel.org>
+ */
+
+#include "config.h"
+
+#include <security/_pam_macros.h>
+#include <security/pam_modules.h>
+#include <security/pam_modutil.h>
+
+#define PWD_INITIAL_LENGTH     0x400
+#define PWD_ABSURD_PWD_LENGTH  0x40001
+#define PWD_LENGTH_SHIFT 4 /* 2^4 == 16 */
+
+extern void
+pam_modutil_cleanup(pam_handle_t *pamh, void *data,
+                    int error_status);
+
+#endif /* PAMMODUTIL_PRIVATE_H */
diff --git a/libpam/pam_modutil_sanitize.c b/libpam/pam_modutil_sanitize.c
new file mode 100644
index 0000000..f26e8ec
--- /dev/null
+++ b/libpam/pam_modutil_sanitize.c
@@ -0,0 +1,147 @@
+/*
+ * This file implements the following functions:
+ *   pam_modutil_sanitize_helper_fds:
+ *     redirects standard descriptors, closes all other descriptors.
+ */
+
+#include "pam_modutil_private.h"
+#include <security/pam_ext.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <syslog.h>
+#include <sys/resource.h>
+
+/*
+ * Creates a pipe, closes its write end, redirects fd to its read end.
+ * Returns fd on success, -1 otherwise.
+ */
+static int
+redirect_in_pipe(pam_handle_t *pamh, int fd, const char *name)
+{
+	int in[2];
+
+	if (pipe(in) < 0) {
+		pam_syslog(pamh, LOG_ERR, "Could not create pipe: %m");
+		return -1;
+	}
+
+	close(in[1]);
+
+	if (in[0] == fd)
+		return fd;
+
+	if (dup2(in[0], fd) != fd) {
+		pam_syslog(pamh, LOG_ERR, "dup2 of %s failed: %m", name);
+		fd = -1;
+	}
+
+	close(in[0]);
+	return fd;
+}
+
+/*
+ * Opens /dev/null for writing, redirects fd there.
+ * Returns fd on success, -1 otherwise.
+ */
+static int
+redirect_out_null(pam_handle_t *pamh, int fd, const char *name)
+{
+	int null = open("/dev/null", O_WRONLY);
+
+	if (null < 0) {
+		pam_syslog(pamh, LOG_ERR, "open of %s failed: %m", "/dev/null");
+		return -1;
+	}
+
+	if (null == fd)
+		return fd;
+
+	if (dup2(null, fd) != fd) {
+		pam_syslog(pamh, LOG_ERR, "dup2 of %s failed: %m", name);
+		fd = -1;
+	}
+
+	close(null);
+	return fd;
+}
+
+static int
+redirect_out(pam_handle_t *pamh, enum pam_modutil_redirect_fd mode,
+	     int fd, const char *name)
+{
+	switch (mode) {
+		case PAM_MODUTIL_PIPE_FD:
+			if (redirect_in_pipe(pamh, fd, name) < 0)
+				return -1;
+			break;
+		case PAM_MODUTIL_NULL_FD:
+			if (redirect_out_null(pamh, fd, name) < 0)
+				return -1;
+			break;
+		case PAM_MODUTIL_IGNORE_FD:
+			break;
+	}
+	return fd;
+}
+
+/* Closes all descriptors after stderr. */
+static void
+close_fds(void)
+{
+	/*
+	 * An arbitrary upper limit for the maximum file descriptor number
+	 * returned by RLIMIT_NOFILE.
+	 */
+	const int MAX_FD_NO = 65535;
+
+	/* The lower limit is the same as for _POSIX_OPEN_MAX. */
+	const int MIN_FD_NO = 20;
+
+	int fd;
+	struct rlimit rlim;
+
+	if (getrlimit(RLIMIT_NOFILE, &rlim) || rlim.rlim_max > (rlim_t)MAX_FD_NO)
+		fd = MAX_FD_NO;
+	else if (rlim.rlim_max < (rlim_t)MIN_FD_NO)
+		fd = MIN_FD_NO;
+	else
+		fd = (int)rlim.rlim_max - 1;
+
+	for (; fd > STDERR_FILENO; --fd)
+		close(fd);
+}
+
+int
+pam_modutil_sanitize_helper_fds(pam_handle_t *pamh,
+				enum pam_modutil_redirect_fd stdin_mode,
+				enum pam_modutil_redirect_fd stdout_mode,
+				enum pam_modutil_redirect_fd stderr_mode)
+{
+	if (stdin_mode != PAM_MODUTIL_IGNORE_FD &&
+	    redirect_in_pipe(pamh, STDIN_FILENO, "stdin") < 0) {
+		return -1;
+	}
+
+	if (redirect_out(pamh, stdout_mode, STDOUT_FILENO, "stdout") < 0)
+		return -1;
+
+	/*
+	 * If stderr should not be ignored and
+	 * redirect mode for stdout and stderr are the same,
+	 * optimize by redirecting stderr to stdout.
+	 */
+	if (stderr_mode != PAM_MODUTIL_IGNORE_FD &&
+	    stdout_mode == stderr_mode) {
+		if (dup2(STDOUT_FILENO, STDERR_FILENO) != STDERR_FILENO) {
+			pam_syslog(pamh, LOG_ERR,
+				   "dup2 of %s failed: %m", "stderr");
+			return -1;
+		}
+	} else {
+		if (redirect_out(pamh, stderr_mode, STDERR_FILENO, "stderr") < 0)
+			return -1;
+	}
+
+	close_fds();
+	return 0;
+}
diff --git a/libpam/pam_modutil_searchkey.c b/libpam/pam_modutil_searchkey.c
new file mode 100644
index 0000000..ba023e5
--- /dev/null
+++ b/libpam/pam_modutil_searchkey.c
@@ -0,0 +1,128 @@
+/*
+ * This file implements the following functions:
+ *   pam_modutil_search_key:
+ *     lookup a value for key in login.defs file or similar key value format
+ */
+
+#include "config.h"
+
+#include "pam_private.h"
+#include "pam_modutil_private.h"
+#include <security/pam_ext.h>
+#include <stdio.h>
+#include <string.h>
+#include <stdlib.h>
+#include <ctype.h>
+#ifdef USE_ECONF
+#include <libeconf.h>
+#endif
+
+#define BUF_SIZE 8192
+
+#ifdef USE_ECONF
+#define LOGIN_DEFS "/etc/login.defs"
+
+#ifndef VENDORDIR
+#define VENDORDIR NULL
+#endif
+
+static char *
+econf_search_key (const char *name, const char *suffix, const char *key)
+{
+	econf_file *key_file = NULL;
+	char *val;
+
+	if (econf_readDirs (&key_file, VENDORDIR, SYSCONFDIR, name, suffix,
+			    " \t", "#"))
+		return NULL;
+
+	if (econf_getStringValue (key_file, NULL, key, &val)) {
+		econf_free (key_file);
+		return NULL;
+	}
+
+	econf_free (key_file);
+
+	return val;
+}
+
+#endif
+
+/* lookup a value for key in login.defs file or similar key value format */
+char *
+pam_modutil_search_key(pam_handle_t *pamh UNUSED,
+		       const char *file_name,
+		       const char *key)
+{
+	FILE *fp;
+	char *buf = NULL;
+	size_t buflen = 0;
+	char *retval = NULL;
+
+#ifdef USE_ECONF
+	if (strcmp (file_name, LOGIN_DEFS) == 0)
+		return econf_search_key ("login", ".defs", key);
+#endif
+
+	fp = fopen(file_name, "r");
+	if (NULL == fp)
+		return NULL;
+
+	while (!feof(fp)) {
+		char *tmp, *cp;
+#if defined(HAVE_GETLINE)
+		ssize_t n = getline(&buf, &buflen, fp);
+#elif defined (HAVE_GETDELIM)
+		ssize_t n = getdelim(&buf, &buflen, '\n', fp);
+#else
+		ssize_t n;
+
+		if (buf == NULL) {
+			buflen = BUF_SIZE;
+			buf = malloc(buflen);
+			if (buf == NULL) {
+				fclose(fp);
+				return NULL;
+			}
+		}
+		buf[0] = '\0';
+		if (fgets(buf, buflen - 1, fp) == NULL)
+			break;
+		else if (buf != NULL)
+			n = strlen(buf);
+		else
+			n = 0;
+#endif /* HAVE_GETLINE / HAVE_GETDELIM */
+		cp = buf;
+
+		if (n < 1)
+			break;
+		if (cp[n - 1] == '\n')
+			cp[n - 1] = '\0';
+
+		tmp = strchr(cp, '#');  /* remove comments */
+		if (tmp)
+			*tmp = '\0';
+		while (isspace((int)*cp))    /* remove spaces and tabs */
+			++cp;
+		if (*cp == '\0')        /* ignore empty lines */
+			continue;
+
+		tmp = strsep (&cp, " \t=");
+		if (cp != NULL)
+			while (isspace((int)*cp) || *cp == '=')
+				++cp;
+		else
+			cp = buf + n;   /* empty string */
+
+		if (strcasecmp(tmp, key) == 0) {
+			retval = strdup(cp);
+			break;
+		}
+	}
+	fclose(fp);
+
+	free(buf);
+
+	return retval;
+}
diff --git a/libpam/pam_password.c b/libpam/pam_password.c
new file mode 100644
index 0000000..592e01f
--- /dev/null
+++ b/libpam/pam_password.c
@@ -0,0 +1,61 @@
+/* pam_password.c - PAM Password Management */
+
+/*
+ * $Id$
+ */
+
+#include "pam_private.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+
+int pam_chauthtok(pam_handle_t *pamh, int flags)
+{
+    int retval;
+
+    D(("called."));
+
+    IF_NO_PAMH("pam_chauthtok", pamh, PAM_SYSTEM_ERR);
+
+    if (__PAM_FROM_MODULE(pamh)) {
+	D(("called from module!?"));
+	return PAM_SYSTEM_ERR;
+    }
+
+    /* applications are not allowed to set this flags */
+    if (flags & (PAM_PRELIM_CHECK | PAM_UPDATE_AUTHTOK)) {
+      pam_syslog (pamh, LOG_ERR,
+		  "PAM_PRELIM_CHECK or PAM_UPDATE_AUTHTOK set by application");
+      return PAM_SYSTEM_ERR;
+    }
+
+    if (pamh->former.choice == PAM_NOT_STACKED) {
+	_pam_start_timer(pamh);    /* we try to make the time for a failure
+				      independent of the time it takes to
+				      fail */
+	_pam_sanitize(pamh);
+	pamh->former.update = PAM_FALSE;
+    }
+
+    /* first call to check if there will be a problem */
+    if (pamh->former.update ||
+	(retval = _pam_dispatch(pamh, flags|PAM_PRELIM_CHECK,
+				PAM_CHAUTHTOK)) == PAM_SUCCESS) {
+	D(("completed check ok: former=%d", pamh->former.update));
+	pamh->former.update = PAM_TRUE;
+	retval = _pam_dispatch(pamh, flags|PAM_UPDATE_AUTHTOK,
+			       PAM_CHAUTHTOK);
+    }
+
+    /* if we completed we should clean up */
+    if (retval != PAM_INCOMPLETE) {
+	_pam_sanitize(pamh);
+	pamh->former.update = PAM_FALSE;
+	_pam_await_timer(pamh, retval);   /* if unsuccessful then wait now */
+	D(("pam_chauthtok exit %d - %d", retval, pamh->former.choice));
+    } else {
+	D(("will resume when ready", retval));
+    }
+
+    return retval;
+}
diff --git a/libpam/pam_prelude.c b/libpam/pam_prelude.c
new file mode 100644
index 0000000..6c73bf5
--- /dev/null
+++ b/libpam/pam_prelude.c
@@ -0,0 +1,454 @@
+/*
+ * pam_prelude.c -- prelude reporting
+ * http://www.prelude-ids.org
+ *
+ * (C) Sebastien Tricaud 2005 <toady@gscore.org>
+ */
+
+#include <stdio.h>
+#include <syslog.h>
+
+#ifdef PRELUDE
+
+#include <libprelude/prelude.h>
+#include <libprelude/prelude-log.h>
+#include <libprelude/idmef-message-print.h>
+
+#include "pam_prelude.h"
+#include "pam_private.h"
+
+
+#define ANALYZER_CLASS "pam"
+#define ANALYZER_MODEL "PAM"
+#define ANALYZER_MANUFACTURER "Sebastien Tricaud, http://www.kernel.org/pub/linux/libs/pam/"
+
+#define DEFAULT_ANALYZER_NAME "PAM"
+
+static const char *
+pam_get_item_service(const pam_handle_t *pamh)
+{
+        const void *service = NULL;
+
+	pam_get_item(pamh, PAM_SERVICE, &service);
+
+        return service;
+}
+
+static const char *
+pam_get_item_user(const pam_handle_t *pamh)
+{
+        const void *user = NULL;
+
+	pam_get_item(pamh, PAM_USER, &user);
+
+        return user;
+}
+
+static const char *
+pam_get_item_user_prompt(const pam_handle_t *pamh)
+{
+        const void *user_prompt = NULL;
+
+	pam_get_item(pamh, PAM_USER_PROMPT, &user_prompt);
+
+        return user_prompt;
+}
+
+static const char *
+pam_get_item_tty(const pam_handle_t *pamh)
+{
+        const void *tty = NULL;
+
+	pam_get_item(pamh, PAM_TTY, &tty);
+
+        return tty;
+}
+
+static const char *
+pam_get_item_ruser(const pam_handle_t *pamh)
+{
+        const void *ruser = NULL;
+
+	pam_get_item(pamh, PAM_RUSER, &ruser);
+
+        return ruser;
+}
+
+static const char *
+pam_get_item_rhost(const pam_handle_t *pamh)
+{
+        const void *rhost = NULL;
+
+	pam_get_item(pamh, PAM_RHOST, &rhost);
+
+        return rhost;
+}
+
+/* Courteously stolen from prelude-lml */
+static int
+generate_additional_data(idmef_alert_t *alert, const char *meaning,
+			 const char *data)
+{
+        int ret;
+        prelude_string_t *str;
+        idmef_additional_data_t *adata;
+
+        ret = idmef_alert_new_additional_data(alert, &adata, -1);
+        if ( ret < 0 )
+                return ret;
+
+        ret = idmef_additional_data_new_meaning(adata, &str);
+        if ( ret < 0 )
+                return ret;
+
+        ret = prelude_string_set_ref(str, meaning);
+        if ( ret < 0 )
+                return ret;
+
+        return idmef_additional_data_set_string_ref(adata, data);
+}
+
+static int
+setup_analyzer(const pam_handle_t *pamh, idmef_analyzer_t *analyzer)
+{
+        int ret;
+        prelude_string_t *string;
+
+        ret = idmef_analyzer_new_model(analyzer, &string);
+        if ( ret < 0 )
+                goto err;
+        prelude_string_set_constant(string, ANALYZER_MODEL);
+
+	ret = idmef_analyzer_new_class(analyzer, &string);
+        if ( ret < 0 )
+                goto err;
+        prelude_string_set_constant(string, ANALYZER_CLASS);
+
+	ret = idmef_analyzer_new_manufacturer(analyzer, &string);
+        if ( ret < 0 )
+                goto err;
+        prelude_string_set_constant(string, ANALYZER_MANUFACTURER);
+
+	ret = idmef_analyzer_new_version(analyzer, &string);
+        if ( ret < 0 )
+                goto err;
+        prelude_string_set_constant(string, PAM_VERSION);
+
+
+        return 0;
+
+ err:
+        pam_syslog(pamh, LOG_WARNING,
+                   "%s: IDMEF error: %s.\n",
+                   prelude_strsource(ret), prelude_strerror(ret));
+
+        return -1;
+}
+
+static void
+pam_alert_prelude(const char *msg, void *data,
+		  pam_handle_t *pamh, int authval)
+{
+        int ret;
+        idmef_time_t *clienttime;
+        idmef_alert_t *alert;
+        prelude_string_t *str;
+        idmef_message_t *idmef = NULL;
+        idmef_classification_t *class;
+        prelude_client_t *client = (prelude_client_t *)data;
+        idmef_source_t *source;
+        idmef_target_t *target;
+        idmef_user_t *user;
+        idmef_user_id_t *user_id;
+        idmef_process_t *process;
+        idmef_classification_t *classification;
+        idmef_impact_t *impact;
+        idmef_assessment_t *assessment;
+        idmef_node_t *node;
+	idmef_analyzer_t *analyzer;
+
+
+        ret = idmef_message_new(&idmef);
+        if ( ret < 0 )
+                goto err;
+
+        ret = idmef_message_new_alert(idmef, &alert);
+        if ( ret < 0 )
+                goto err;
+
+        ret = idmef_alert_new_classification(alert, &class);
+        if ( ret < 0 )
+                goto err;
+
+        ret = idmef_classification_new_text(class, &str);
+        if ( ret < 0 )
+                goto err;
+
+        ret = prelude_string_new_ref(&str, msg);
+        if ( ret < 0 )
+                goto err;
+
+        idmef_classification_set_text(class, str);
+
+        ret = idmef_time_new_from_gettimeofday(&clienttime);
+        if ( ret < 0 )
+                goto err;
+        idmef_alert_set_create_time(alert, clienttime);
+
+        idmef_alert_set_analyzer(alert,
+                                 idmef_analyzer_ref(prelude_client_get_analyzer(client)),
+                                 0);
+
+        /**********
+         * SOURCE *
+         **********/
+        ret = idmef_alert_new_source(alert, &source, -1);
+        if ( ret < 0 )
+                goto err;
+
+        /* BEGIN: Sets the user doing authentication stuff */
+        ret = idmef_source_new_user(source, &user);
+        if ( ret < 0 )
+                goto err;
+        idmef_user_set_category(user, IDMEF_USER_CATEGORY_APPLICATION);
+
+        ret = idmef_user_new_user_id(user, &user_id, 0);
+        if ( ret < 0 )
+                goto err;
+        idmef_user_id_set_type(user_id, IDMEF_USER_ID_TYPE_ORIGINAL_USER);
+
+	if ( pam_get_item_ruser(pamh) ) {
+	        ret = prelude_string_new(&str);
+                if ( ret < 0 )
+                        goto err;
+
+	        ret = prelude_string_set_ref(str, pam_get_item_ruser(pamh));
+                if ( ret < 0 )
+                        goto err;
+
+	        idmef_user_id_set_name(user_id, str);
+	}
+        /* END */
+        /* BEGIN: Adds TTY infos */
+	if ( pam_get_item_tty(pamh) ) {
+	        ret = prelude_string_new(&str);
+                if ( ret < 0 )
+                        goto err;
+
+	        ret = prelude_string_set_ref(str, pam_get_item_tty(pamh));
+                if ( ret < 0 )
+                        goto err;
+
+                idmef_user_id_set_tty(user_id, str);
+	}
+        /* END */
+        /* BEGIN: Sets the source node (rhost) */
+        ret = idmef_source_new_node(source, &node);
+        if ( ret < 0 )
+                goto err;
+        idmef_node_set_category(node, IDMEF_NODE_CATEGORY_HOSTS);
+
+	if ( pam_get_item_rhost(pamh) ) {
+	        ret = prelude_string_new(&str);
+                if ( ret < 0 )
+                        goto err;
+
+		ret = prelude_string_set_ref(str, pam_get_item_rhost(pamh));
+                if ( ret < 0 )
+                        goto err;
+
+		idmef_node_set_name(node, str);
+	}
+        /* END */
+        /* BEGIN: Describe the service */
+        ret = idmef_source_new_process(source, &process);
+        if ( ret < 0 )
+                goto err;
+        idmef_process_set_pid(process, getpid());
+
+	if ( pam_get_item_service(pamh) ) {
+	        ret = prelude_string_new(&str);
+                if ( ret < 0 )
+                        goto err;
+
+		ret = prelude_string_set_ref(str, pam_get_item_service(pamh));
+                if ( ret < 0 )
+                        goto err;
+
+		idmef_process_set_name(process, str);
+	}
+        /* END */
+
+        /**********
+         * TARGET *
+         **********/
+
+        ret = idmef_alert_new_target(alert, &target, -1);
+        if ( ret < 0 )
+                goto err;
+
+
+        /* BEGIN: Sets the target node  */
+	analyzer = prelude_client_get_analyzer(client);
+        if ( ! analyzer ) goto err;
+
+	node = idmef_analyzer_get_node(analyzer);
+        if ( ! node ) goto err;
+	idmef_target_set_node(target, node);
+	node = idmef_node_ref(node);
+        if ( ! node ) goto err;
+	/* END */
+        /* BEGIN: Sets the user doing authentication stuff */
+        ret = idmef_target_new_user(target, &user);
+        if ( ret < 0 )
+                goto err;
+        idmef_user_set_category(user, IDMEF_USER_CATEGORY_APPLICATION);
+
+        ret = idmef_user_new_user_id(user, &user_id, 0);
+        if ( ret < 0 )
+                goto err;
+        idmef_user_id_set_type(user_id, IDMEF_USER_ID_TYPE_TARGET_USER);
+
+	if ( pam_get_item_user(pamh) ) {
+	        ret = prelude_string_new(&str);
+                if ( ret < 0 )
+                        goto err;
+
+		ret = prelude_string_set_ref(str, pam_get_item_user(pamh));
+                if ( ret < 0 )
+                        goto err;
+
+		idmef_user_id_set_name(user_id, str);
+	}
+        /* END */
+        /* BEGIN: Short description of the alert */
+        ret = idmef_alert_new_classification(alert, &classification);
+        if ( ret < 0 )
+                goto err;
+
+        ret = prelude_string_new(&str);
+        if ( ret < 0 )
+                goto err;
+
+        ret = prelude_string_set_ref(str,
+                                     authval == PAM_SUCCESS ?
+                                     "Authentication Success" : "Authentication Failure");
+        if ( ret < 0 )
+                goto err;
+
+        idmef_classification_set_text(classification, str);
+        /* END */
+        /* BEGIN: Long description of the alert */
+        ret = idmef_alert_new_assessment(alert, &assessment);
+        if ( ret < 0 )
+                goto err;
+
+        ret = idmef_assessment_new_impact(assessment, &impact);
+        if ( ret < 0 )
+                goto err;
+
+        ret = prelude_string_new(&str);
+        if ( ret < 0 )
+                goto err;
+
+        ret = prelude_string_set_ref(str, pam_strerror (pamh, authval));
+        if ( ret < 0 )
+                goto err;
+
+        idmef_impact_set_description(impact, str);
+        /* END */
+        /* BEGIN: Adding additional data */
+	if ( pam_get_item_user_prompt(pamh) ) {
+	        ret = generate_additional_data(alert, "Local User Prompt",
+                                               pam_get_item_user_prompt(pamh));
+                if ( ret < 0 )
+                        goto err;
+        }
+        /* END */
+
+        prelude_client_send_idmef(client, idmef);
+
+        if ( idmef )
+                idmef_message_destroy(idmef);
+
+	return;
+ err:
+        pam_syslog(pamh, LOG_WARNING, "%s: IDMEF error: %s.\n",
+                   prelude_strsource(ret), prelude_strerror(ret));
+
+        if ( idmef )
+                idmef_message_destroy(idmef);
+
+}
+
+static int
+pam_alert_prelude_init(pam_handle_t *pamh, int authval)
+{
+
+        int ret;
+        prelude_client_t *client = NULL;
+
+        ret = prelude_init(NULL, NULL);
+        if ( ret < 0 ) {
+                pam_syslog(pamh, LOG_WARNING,
+                         "%s: Unable to initialize the Prelude library: %s.\n",
+                         prelude_strsource(ret), prelude_strerror(ret));
+                return -1;
+        }
+
+        ret = prelude_client_new(&client, DEFAULT_ANALYZER_NAME);
+        if ( ! client ) {
+                pam_syslog(pamh, LOG_WARNING,
+                         "%s: Unable to create a prelude client object: %s.\n",
+                         prelude_strsource(ret), prelude_strerror(ret));
+
+                return -1;
+        }
+
+
+        ret = setup_analyzer(pamh, prelude_client_get_analyzer(client));
+        if ( ret < 0 ) {
+                pam_syslog(pamh, LOG_WARNING,
+                         "%s: Unable to setup analyzer: %s\n",
+                         prelude_strsource(ret), prelude_strerror(ret));
+
+		prelude_client_destroy(client, PRELUDE_CLIENT_EXIT_STATUS_FAILURE);
+
+		return -1;
+        }
+
+        ret = prelude_client_start(client);
+        if ( ret < 0 ) {
+                pam_syslog(pamh, LOG_WARNING,
+                         "%s: Unable to initialize prelude client: %s.\n",
+                         prelude_strsource(ret), prelude_strerror(ret));
+
+		prelude_client_destroy(client, PRELUDE_CLIENT_EXIT_STATUS_FAILURE);
+
+                return -1;
+        }
+
+        pam_alert_prelude("libpam alert" , client, pamh, authval);
+
+	prelude_client_destroy(client, PRELUDE_CLIENT_EXIT_STATUS_SUCCESS);
+
+        return 0;
+}
+
+void
+prelude_send_alert(pam_handle_t *pamh, int authval)
+{
+
+        int ret;
+
+        prelude_log_set_flags(PRELUDE_LOG_FLAGS_SYSLOG);
+
+        ret = pam_alert_prelude_init(pamh, authval);
+        if ( ret < 0 )
+                pam_syslog(pamh, LOG_WARNING, "No prelude alert sent");
+
+	prelude_deinit();
+
+}
+
+#endif /* PRELUDE */
diff --git a/libpam/pam_prelude.h b/libpam/pam_prelude.h
new file mode 100644
index 0000000..196b141
--- /dev/null
+++ b/libpam/pam_prelude.h
@@ -0,0 +1,15 @@
+/*
+ * pam_prelude.h -- prelude ids reporting
+ * http://www.prelude-ids.org
+ *
+ * (C) Sebastien Tricaud 2005 <toady@gscore.org>
+ */
+
+#ifndef _SECURITY_PAM_PRELUDE_H
+#define _SECURITY_PAM_PRELUDE_H
+
+#include <security/_pam_types.h>
+
+void prelude_send_alert(pam_handle_t *pamh, int authval);
+
+#endif /* _SECURITY_PAM_PRELUDE_H */
diff --git a/libpam/pam_private.h b/libpam/pam_private.h
new file mode 100644
index 0000000..508527c
--- /dev/null
+++ b/libpam/pam_private.h
@@ -0,0 +1,358 @@
+/*
+ * pam_private.h
+ *
+ * This is the Linux-PAM Library Private Header. It contains things
+ * internal to the Linux-PAM library. Things not needed by either an
+ * application or module.
+ *
+ * Please see end of file for copyright.
+ *
+ * Creator: Marc Ewing.
+ * Maintained: CVS
+ */
+
+#ifndef _PAM_PRIVATE_H
+#define _PAM_PRIVATE_H
+
+#include "config.h"
+
+#include <syslog.h>
+
+#include <security/pam_appl.h>
+#include <security/pam_modules.h>
+#include <security/pam_ext.h>
+
+/* the Linux-PAM configuration file */
+
+#define PAM_CONFIG         "/etc/pam.conf"
+#define PAM_CONFIG_D       "/etc/pam.d"
+#define PAM_CONFIG_DF      "/etc/pam.d/%s"
+#define PAM_CONFIG_DIST_D  "/usr/lib/pam.d"
+#define PAM_CONFIG_DIST_DF "/usr/lib/pam.d/%s"
+#ifdef VENDORDIR
+#define PAM_CONFIG_DIST2_D  VENDORDIR"/pam.d"
+#define PAM_CONFIG_DIST2_DF VENDORDIR"/pam.d/%s"
+#endif
+
+
+#define PAM_DEFAULT_SERVICE        "other"     /* lower case */
+
+#ifdef PAM_LOCKING
+/*
+ * the Linux-PAM lock file. If it exists Linux-PAM will abort. Use it
+ * to block access to libpam
+ */
+#define PAM_LOCK_FILE "/var/lock/subsys/PAM"
+#endif
+
+/* components of the pam_handle structure */
+
+#define _PAM_INVALID_RETVAL  -1    /* default value for cached_retval */
+
+struct handler {
+    int handler_type;
+    int (*func)(pam_handle_t *pamh, int flags, int argc, char **argv);
+    int actions[_PAM_RETURN_VALUES];
+    /* set by authenticate, open_session, chauthtok(1st)
+       consumed by setcred, close_session, chauthtok(2nd) */
+    int cached_retval; int *cached_retval_p;
+    int argc;
+    char **argv;
+    struct handler *next;
+    char *mod_name;
+    int stack_level;
+    int grantor;
+};
+
+#define PAM_HT_MODULE       0
+#define PAM_HT_MUST_FAIL    1
+#define PAM_HT_SUBSTACK     2
+#define PAM_HT_SILENT_MODULE 3
+
+struct loaded_module {
+    char *name;
+    int type; /* PAM_STATIC_MOD or PAM_DYNAMIC_MOD */
+    void *dl_handle;
+};
+
+#define PAM_MT_DYNAMIC_MOD 0
+#define PAM_MT_STATIC_MOD  1
+#define PAM_MT_FAULTY_MOD 2
+
+struct handlers {
+    struct handler *authenticate;
+    struct handler *setcred;
+    struct handler *acct_mgmt;
+    struct handler *open_session;
+    struct handler *close_session;
+    struct handler *chauthtok;
+};
+
+struct service {
+    struct loaded_module *module; /* Array of modules */
+    int modules_allocated;
+    int modules_used;
+    int handlers_loaded;
+
+    struct handlers conf;        /* the configured handlers */
+    struct handlers other;       /* the default handlers */
+};
+
+/*
+ * Environment helper functions
+ */
+
+#define PAM_ENV_CHUNK         10 /* chunks of memory calloc()'d      *
+				  * at once                          */
+
+struct pam_environ {
+    int entries;                 /* the number of pointers available */
+    int requested;               /* the number of pointers used:     *
+				  *     1 <= requested <= entries    */
+    char **list;                 /* the environment storage (a list  *
+				  * of pointers to malloc() memory)  */
+};
+
+#include <sys/time.h>
+
+typedef enum { PAM_FALSE, PAM_TRUE } _pam_boolean;
+
+struct _pam_fail_delay {
+    _pam_boolean set;
+    unsigned int delay;
+    time_t begin;
+    const void *delay_fn_ptr;
+};
+
+/* initial state in substack */
+struct _pam_substack_state {
+    int impression;
+    int status;
+};
+
+struct _pam_former_state {
+/* this is known and set by _pam_dispatch() */
+    int choice;            /* which flavor of module function did we call? */
+
+/* state info for the _pam_dispatch_aux() function */
+    int depth;             /* how deep in the stack were we? */
+    int impression;        /* the impression at that time */
+    int status;            /* the status before returning incomplete */
+    struct _pam_substack_state *substates; /* array of initial substack states */
+
+/* state info used by pam_get_user() function */
+    int fail_user;
+    int want_user;
+    char *prompt;          /* saved prompt information */
+
+/* state info for the pam_chauthtok() function */
+    _pam_boolean update;
+};
+
+struct pam_handle {
+    char *authtok;
+    unsigned caller_is;
+    struct pam_conv *pam_conversation;
+    char *oldauthtok;
+    char *prompt;                /* for use by pam_get_user() */
+    char *service_name;
+    char *user;
+    char *rhost;
+    char *ruser;
+    char *tty;
+    char *xdisplay;
+    char *authtok_type;          /* PAM_AUTHTOK_TYPE */
+    struct pam_data *data;
+    struct pam_environ *env;      /* structure to maintain environment list */
+    struct _pam_fail_delay fail_delay;   /* helper function for easy delays */
+    struct pam_xauth_data xauth;        /* auth info for X display */
+    struct service handlers;
+    struct _pam_former_state former;  /* library state - support for
+					 event driven applications */
+    const char *mod_name;	/* Name of the module currently executed */
+    int mod_argc;               /* Number of module arguments */
+    char **mod_argv;            /* module arguments */
+    int choice;			/* Which function we call from the module */
+
+#ifdef HAVE_LIBAUDIT
+    int audit_state;             /* keep track of reported audit messages */
+#endif
+    int authtok_verified;
+    char *confdir;
+};
+
+/* Values for select arg to _pam_dispatch() */
+#define PAM_NOT_STACKED   0
+#define PAM_AUTHENTICATE  1
+#define PAM_SETCRED       2
+#define PAM_ACCOUNT       3
+#define PAM_OPEN_SESSION  4
+#define PAM_CLOSE_SESSION 5
+#define PAM_CHAUTHTOK     6
+
+#define _PAM_ACTION_IS_JUMP(x)  ((x) > 0)
+#define _PAM_ACTION_IGNORE      0
+#define _PAM_ACTION_OK         -1
+#define _PAM_ACTION_DONE       -2
+#define _PAM_ACTION_BAD        -3
+#define _PAM_ACTION_DIE        -4
+#define _PAM_ACTION_RESET      -5
+/* Add any new entries here.  Will need to change ..._UNDEF and then
+ * need to change pam_tokens.h */
+#define _PAM_ACTION_UNDEF      -6   /* this is treated as an error
+				       ( = _PAM_ACTION_BAD) */
+
+#define PAM_SUBSTACK_MAX_LEVEL 16   /* maximum level of substacks */
+
+/* character tables for parsing config files */
+extern const char * const _pam_token_actions[-_PAM_ACTION_UNDEF];
+extern const char * const _pam_token_returns[_PAM_RETURN_VALUES+1];
+
+/*
+ * internally defined functions --- these should not be directly
+ * called by applications or modules
+ */
+int _pam_dispatch(pam_handle_t *pamh, int flags, int choice);
+
+/* Free various allocated structures and dlclose() the libs */
+int _pam_free_handlers(pam_handle_t *pamh);
+
+/* Parse config file, allocate handler structures, dlopen() */
+int _pam_init_handlers(pam_handle_t *pamh);
+
+/* Set all handler stuff to 0/NULL - called once from pam_start() */
+void _pam_start_handlers(pam_handle_t *pamh);
+
+/* environment helper functions */
+
+/* create the environment structure */
+int _pam_make_env(pam_handle_t *pamh);
+
+/* delete the environment structure */
+void _pam_drop_env(pam_handle_t *pamh);
+
+/* these functions deal with failure delays as required by the
+   authentication modules and application. Their *interface* is likely
+   to remain the same although their function is hopefully going to
+   improve */
+
+/* reset the timer to no-delay */
+void _pam_reset_timer(pam_handle_t *pamh);
+
+/* this sets the clock ticking */
+void _pam_start_timer(pam_handle_t *pamh);
+
+/* this waits for the clock to stop ticking if status != PAM_SUCCESS */
+void _pam_await_timer(pam_handle_t *pamh, int status);
+
+typedef void (*voidfunc(void))(void);
+typedef int (*servicefn)(pam_handle_t *, int, int, char **);
+
+void *_pam_dlopen (const char *mod_path);
+servicefn _pam_dlsym (void *handle, const char *symbol);
+void _pam_dlclose (void *handle);
+const char *_pam_dlerror (void);
+
+/* For now we just use a stack and linear search for module data. */
+/* If it becomes apparent that there is a lot of data, it should  */
+/* changed to either a sorted list or a hash table.               */
+
+struct pam_data {
+     char *name;
+     void *data;
+     void (*cleanup)(pam_handle_t *pamh, void *data, int error_status);
+     struct pam_data *next;
+};
+
+void _pam_free_data(pam_handle_t *pamh, int status);
+
+char *_pam_StrTok(char *from, const char *format, char **next);
+
+char *_pam_strdup(const char *s);
+
+char *_pam_memdup(const char *s, int len);
+
+int _pam_mkargv(const char *s, char ***argv, int *argc);
+
+void _pam_sanitize(pam_handle_t *pamh);
+
+void _pam_set_default_control(int *control_array, int default_action);
+
+void _pam_parse_control(int *control_array, char *tok);
+
+#define _PAM_SYSTEM_LOG_PREFIX "PAM"
+
+/*
+ * XXX - Take care with this. It could confuse the logic of a trailing
+ *       else
+ */
+
+#define IF_NO_PAMH(X,pamh,ERR)                    \
+if ((pamh) == NULL) {                             \
+    syslog(LOG_ERR, _PAM_SYSTEM_LOG_PREFIX " " X ": NULL pam handle passed"); \
+    return ERR;                                   \
+}
+
+/*
+ * include some helpful macros
+ */
+
+#include <security/_pam_macros.h>
+
+/* used to work out where control currently resides (in an application
+   or in a module) */
+
+#define _PAM_CALLED_FROM_MODULE         1
+#define _PAM_CALLED_FROM_APP            2
+
+#define __PAM_FROM_MODULE(pamh)  ((pamh)->caller_is == _PAM_CALLED_FROM_MODULE)
+#define __PAM_FROM_APP(pamh)     ((pamh)->caller_is == _PAM_CALLED_FROM_APP)
+#define __PAM_TO_MODULE(pamh) \
+        do { (pamh)->caller_is = _PAM_CALLED_FROM_MODULE; } while (0)
+#define __PAM_TO_APP(pamh)    \
+        do { (pamh)->caller_is = _PAM_CALLED_FROM_APP; } while (0)
+
+#ifdef HAVE_LIBAUDIT
+extern int _pam_auditlog(pam_handle_t *pamh, int action, int retval, int flags, struct handler *h);
+extern int _pam_audit_end(pam_handle_t *pamh, int pam_status);
+#endif
+
+/*
+ * Copyright (C) 1995 by Red Hat Software, Marc Ewing
+ * Copyright (c) 1996-8,2001 by Andrew G. Morgan <morgan@kernel.org>
+ *
+ * All rights reserved
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#endif /* _PAM_PRIVATE_H_ */
diff --git a/libpam/pam_session.c b/libpam/pam_session.c
new file mode 100644
index 0000000..cb393c1
--- /dev/null
+++ b/libpam/pam_session.c
@@ -0,0 +1,45 @@
+/* pam_session.c - PAM Session Management */
+
+/*
+ * $Id$
+ */
+
+#include "pam_private.h"
+
+#include <stdio.h>
+
+int pam_open_session(pam_handle_t *pamh, int flags)
+{
+    int retval;
+
+    D(("called"));
+
+    IF_NO_PAMH("pam_open_session", pamh, PAM_SYSTEM_ERR);
+
+    if (__PAM_FROM_MODULE(pamh)) {
+	D(("called from module!?"));
+	return PAM_SYSTEM_ERR;
+    }
+    retval = _pam_dispatch(pamh, flags, PAM_OPEN_SESSION);
+
+    return retval;
+}
+
+int pam_close_session(pam_handle_t *pamh, int flags)
+{
+    int retval;
+
+    D(("called"));
+
+    IF_NO_PAMH("pam_close_session", pamh, PAM_SYSTEM_ERR);
+
+    if (__PAM_FROM_MODULE(pamh)) {
+	D(("called from module!?"));
+	return PAM_SYSTEM_ERR;
+    }
+
+    retval = _pam_dispatch(pamh, flags, PAM_CLOSE_SESSION);
+
+    return retval;
+
+}
diff --git a/libpam/pam_start.c b/libpam/pam_start.c
new file mode 100644
index 0000000..99dd038
--- /dev/null
+++ b/libpam/pam_start.c
@@ -0,0 +1,179 @@
+/* pam_start.c */
+
+/* Creator Marc Ewing
+ * Maintained by AGM
+ *
+ * $Id$
+ *
+ */
+
+#include "pam_private.h"
+
+#include <ctype.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <syslog.h>
+
+static int _pam_start_internal (
+    const char *service_name,
+    const char *user,
+    const struct pam_conv *pam_conversation,
+    const char *confdir,
+    pam_handle_t **pamh)
+{
+    D(("called pam_start: [%s] [%s] [%p] [%p]"
+       ,service_name, user, pam_conversation, pamh));
+
+    if (pamh == NULL) {
+	pam_syslog(NULL, LOG_CRIT,
+		   "pam_start: invalid argument: pamh == NULL");
+	return (PAM_SYSTEM_ERR);
+    }
+
+    if (service_name == NULL) {
+	pam_syslog(NULL, LOG_CRIT,
+		   "pam_start: invalid argument: service == NULL");
+	return (PAM_SYSTEM_ERR);
+    }
+
+    if (pam_conversation == NULL) {
+	pam_syslog(NULL, LOG_CRIT,
+		   "pam_start: invalid argument: conv == NULL");
+	return (PAM_SYSTEM_ERR);
+    }
+
+    if ((*pamh = calloc(1, sizeof(**pamh))) == NULL) {
+	pam_syslog(NULL, LOG_CRIT, "pam_start: calloc failed for *pamh");
+	return (PAM_BUF_ERR);
+    }
+
+    /* All service names should be files below /etc/pam.d and nothing
+       else. Forbid paths. */
+    if (strrchr(service_name, '/') != NULL)
+	service_name = strrchr(service_name, '/') + 1;
+
+    /* Mark the caller as the application - permission to do certain
+       things is limited to a module or an application */
+
+    __PAM_TO_APP(*pamh);
+
+    if (((*pamh)->service_name = _pam_strdup(service_name)) == NULL) {
+	pam_syslog(*pamh, LOG_CRIT,
+		   "pam_start: _pam_strdup failed for service name");
+	_pam_drop(*pamh);
+	return (PAM_BUF_ERR);
+    } else {
+	char *tmp;
+
+	for (tmp=(*pamh)->service_name; *tmp; ++tmp)
+	    *tmp = tolower(*tmp);                   /* require lower case */
+    }
+
+    if (user) {
+	if (((*pamh)->user = _pam_strdup(user)) == NULL) {
+	    pam_syslog(*pamh, LOG_CRIT,
+		       "pam_start: _pam_strdup failed for user");
+	    _pam_drop((*pamh)->service_name);
+	    _pam_drop(*pamh);
+	    return (PAM_BUF_ERR);
+	}
+    } else
+	(*pamh)->user = NULL;
+
+    if (confdir) {
+	if (((*pamh)->confdir = _pam_strdup(confdir)) == NULL) {
+	    pam_syslog(*pamh, LOG_CRIT,
+		       "pam_start: _pam_strdup failed for confdir");
+	    _pam_drop((*pamh)->service_name);
+	    _pam_drop((*pamh)->user);
+	    _pam_drop(*pamh);
+	    return (PAM_BUF_ERR);
+	}
+    } else
+	(*pamh)->confdir = NULL;
+
+    (*pamh)->tty = NULL;
+    (*pamh)->prompt = NULL;              /* prompt for pam_get_user() */
+    (*pamh)->ruser = NULL;
+    (*pamh)->rhost = NULL;
+    (*pamh)->authtok = NULL;
+    (*pamh)->oldauthtok = NULL;
+    (*pamh)->fail_delay.delay_fn_ptr = NULL;
+    (*pamh)->former.choice = PAM_NOT_STACKED;
+    (*pamh)->former.substates = NULL;
+#ifdef HAVE_LIBAUDIT
+    (*pamh)->audit_state = 0;
+#endif
+    (*pamh)->xdisplay = NULL;
+    (*pamh)->authtok_type = NULL;
+    (*pamh)->authtok_verified = 0;
+    memset (&((*pamh)->xauth), 0, sizeof ((*pamh)->xauth));
+
+    if (((*pamh)->pam_conversation = (struct pam_conv *)
+	  malloc(sizeof(struct pam_conv))) == NULL) {
+	pam_syslog(*pamh, LOG_CRIT, "pam_start: malloc failed for pam_conv");
+	_pam_drop((*pamh)->service_name);
+	_pam_drop((*pamh)->user);
+	_pam_drop((*pamh)->confdir);
+	_pam_drop(*pamh);
+	return (PAM_BUF_ERR);
+    } else {
+	memcpy((*pamh)->pam_conversation, pam_conversation,
+	       sizeof(struct pam_conv));
+    }
+
+    (*pamh)->data = NULL;
+    if ( _pam_make_env(*pamh) != PAM_SUCCESS ) {
+	pam_syslog(*pamh,LOG_ERR,"pam_start: failed to initialize environment");
+	_pam_drop((*pamh)->pam_conversation);
+	_pam_drop((*pamh)->service_name);
+	_pam_drop((*pamh)->user);
+	_pam_drop((*pamh)->confdir);
+	_pam_drop(*pamh);
+	return PAM_ABORT;
+    }
+
+    _pam_reset_timer(*pamh);         /* initialize timer support */
+
+    _pam_start_handlers(*pamh);                   /* cannot fail */
+
+    /* According to the SunOS man pages, loading modules and resolving
+     * symbols happens on the first call from the application. */
+
+    if ( _pam_init_handlers(*pamh) != PAM_SUCCESS ) {
+	pam_syslog(*pamh, LOG_ERR, "pam_start: failed to initialize handlers");
+	_pam_drop_env(*pamh);                 /* purge the environment */
+	_pam_drop((*pamh)->pam_conversation);
+	_pam_drop((*pamh)->service_name);
+	_pam_drop((*pamh)->user);
+	_pam_drop((*pamh)->confdir);
+	_pam_drop(*pamh);
+	return PAM_ABORT;
+    }
+
+    D(("exiting pam_start successfully"));
+
+    return PAM_SUCCESS;
+}
+
+int pam_start_confdir (
+    const char *service_name,
+    const char *user,
+    const struct pam_conv *pam_conversation,
+    const char *confdir,
+    pam_handle_t **pamh)
+{
+    return _pam_start_internal(service_name, user, pam_conversation,
+			       confdir, pamh);
+}
+
+int pam_start (
+    const char *service_name,
+    const char *user,
+    const struct pam_conv *pam_conversation,
+    pam_handle_t **pamh)
+{
+    return _pam_start_internal(service_name, user, pam_conversation,
+			       NULL, pamh);
+}
diff --git a/libpam/pam_strerror.c b/libpam/pam_strerror.c
new file mode 100644
index 0000000..17c8194
--- /dev/null
+++ b/libpam/pam_strerror.c
@@ -0,0 +1,106 @@
+/*
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "pam_private.h"
+
+const char *pam_strerror(pam_handle_t *pamh UNUSED, int errnum)
+{
+    switch (errnum) {
+    case PAM_SUCCESS:
+      return _("Success");
+    case PAM_ABORT:
+      return _("Critical error - immediate abort");
+    case PAM_OPEN_ERR:
+      return _("Failed to load module");
+    case PAM_SYMBOL_ERR:
+      return _("Symbol not found");
+    case PAM_SERVICE_ERR:
+      return _("Error in service module");
+    case PAM_SYSTEM_ERR:
+      return _("System error");
+    case PAM_BUF_ERR:
+      return _("Memory buffer error");
+    case PAM_PERM_DENIED:
+      return _("Permission denied");
+    case PAM_AUTH_ERR:
+      return _("Authentication failure");
+    case PAM_CRED_INSUFFICIENT:
+      return _("Insufficient credentials to access authentication data");
+    case PAM_AUTHINFO_UNAVAIL:
+      return _("Authentication service cannot retrieve authentication info");
+    case PAM_USER_UNKNOWN:
+      return _("User not known to the underlying authentication module");
+    case PAM_MAXTRIES:
+      return _("Have exhausted maximum number of retries for service");
+    case PAM_NEW_AUTHTOK_REQD:
+      return _("Authentication token is no longer valid; new one required");
+    case PAM_ACCT_EXPIRED:
+      return _("User account has expired");
+    case PAM_SESSION_ERR:
+      return _("Cannot make/remove an entry for the specified session");
+    case PAM_CRED_UNAVAIL:
+      return _("Authentication service cannot retrieve user credentials");
+    case PAM_CRED_EXPIRED:
+      return _("User credentials expired");
+    case PAM_CRED_ERR:
+      return _("Failure setting user credentials");
+    case PAM_NO_MODULE_DATA:
+      return _("No module specific data is present");
+    case PAM_BAD_ITEM:
+      return _("Bad item passed to pam_*_item()");
+    case PAM_CONV_ERR:
+      return _("Conversation error");
+    case PAM_AUTHTOK_ERR:
+      return _("Authentication token manipulation error");
+    case PAM_AUTHTOK_RECOVERY_ERR:
+      return _("Authentication information cannot be recovered");
+    case PAM_AUTHTOK_LOCK_BUSY:
+      return _("Authentication token lock busy");
+    case PAM_AUTHTOK_DISABLE_AGING:
+      return _("Authentication token aging disabled");
+    case PAM_TRY_AGAIN:
+      return _("Failed preliminary check by password service");
+    case PAM_IGNORE:
+      return _("The return value should be ignored by PAM dispatch");
+    case PAM_MODULE_UNKNOWN:
+      return _("Module is unknown");
+    case PAM_AUTHTOK_EXPIRED:
+      return _("Authentication token expired");
+    case PAM_CONV_AGAIN:
+      return _("Conversation is waiting for event");
+    case PAM_INCOMPLETE:
+      return _("Application needs to call libpam again");
+    }
+
+    return _("Unknown PAM error");
+}
diff --git a/libpam/pam_syslog.c b/libpam/pam_syslog.c
new file mode 100644
index 0000000..c5a6fec
--- /dev/null
+++ b/libpam/pam_syslog.c
@@ -0,0 +1,115 @@
+/*
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdarg.h>
+#include <errno.h>
+
+#include <security/pam_modules.h>
+#include <security/_pam_macros.h>
+#include <security/pam_ext.h>
+
+#include "pam_private.h"
+
+#ifndef LOG_AUTHPRIV
+#define LOG_AUTHPRIV LOG_AUTH
+#endif
+
+static const char *
+_pam_choice2str (int choice)
+{
+  switch (choice)
+    {
+    case PAM_AUTHENTICATE:
+      return "auth";
+    case PAM_SETCRED:
+      return "setcred";
+    case PAM_ACCOUNT:
+      return "account";
+    case PAM_OPEN_SESSION:
+    case PAM_CLOSE_SESSION:
+      return "session";
+    case PAM_CHAUTHTOK:
+      return "chauthtok";
+    }
+  return "";
+}
+
+void
+pam_vsyslog (const pam_handle_t *pamh, int priority,
+	     const char *fmt, va_list args)
+{
+  char *msgbuf1 = NULL, *msgbuf2 = NULL;
+  int save_errno = errno;
+
+  if (pamh && pamh->mod_name)
+    {
+      if (asprintf (&msgbuf1, "%s(%s:%s):", pamh->mod_name,
+		    pamh->service_name?pamh->service_name:"<unknown>",
+		    _pam_choice2str (pamh->choice)) < 0)
+	{
+	  syslog (LOG_AUTHPRIV|LOG_ERR, "asprintf: %m");
+	  return;
+	}
+    }
+
+  errno = save_errno;
+  if (vasprintf (&msgbuf2, fmt, args) < 0)
+    {
+      syslog (LOG_AUTHPRIV|LOG_ERR, "vasprintf: %m");
+      _pam_drop (msgbuf1);
+      return;
+    }
+
+  errno = save_errno;
+  syslog (LOG_AUTHPRIV|priority, "%s %s",
+	  (msgbuf1 ? msgbuf1 : _PAM_SYSTEM_LOG_PREFIX), msgbuf2);
+
+  _pam_drop (msgbuf1);
+  _pam_drop (msgbuf2);
+}
+
+void
+pam_syslog (const pam_handle_t *pamh, int priority,
+	    const char *fmt, ...)
+{
+  va_list args;
+
+  va_start (args, fmt);
+  pam_vsyslog (pamh, priority, fmt, args);
+  va_end (args);
+}
diff --git a/libpam/pam_tokens.h b/libpam/pam_tokens.h
new file mode 100644
index 0000000..1412fa3
--- /dev/null
+++ b/libpam/pam_tokens.h
@@ -0,0 +1,112 @@
+/*
+ * pam_tokens.h
+ *
+ * $Id$
+ *
+ * This is a Linux-PAM Library Private Header file. It contains tokens
+ * that are used when we parse the configuration file(s).
+ *
+ * Please see end of file for copyright.
+ *
+ * Creator: Andrew Morgan.
+ *
+ */
+
+#ifndef _PAM_TOKENS_H
+#define _PAM_TOKENS_H
+
+/* an array of actions */
+
+#ifndef LIBPAM_COMPILE
+static
+#endif
+const char * const _pam_token_actions[-_PAM_ACTION_UNDEF] = {
+    "ignore",     /*  0 */
+    "ok",         /* -1 */
+    "done",       /* -2 */
+    "bad",        /* -3 */
+    "die",        /* -4 */
+    "reset",      /* -5 */
+};
+
+/* an array of possible return values */
+
+#ifndef LIBPAM_COMPILE
+static
+#endif
+const char * const _pam_token_returns[_PAM_RETURN_VALUES+1] = {
+    "success",           /* 0 */
+    "open_err",          /* 1 */
+    "symbol_err",        /* 2 */
+    "service_err",       /* 3 */
+    "system_err",        /* 4 */
+    "buf_err",           /* 5 */
+    "perm_denied",       /* 6 */
+    "auth_err",          /* 7 */
+    "cred_insufficient", /* 8 */
+    "authinfo_unavail",  /* 9 */
+    "user_unknown",      /* 10 */
+    "maxtries",          /* 11 */
+    "new_authtok_reqd",  /* 12 */
+    "acct_expired",      /* 13 */
+    "session_err",       /* 14 */
+    "cred_unavail",      /* 15 */
+    "cred_expired",      /* 16 */
+    "cred_err",          /* 17 */
+    "no_module_data",    /* 18 */
+    "conv_err",          /* 19 */
+    "authtok_err",       /* 20 */
+    "authtok_recover_err", /* 21 */
+    "authtok_lock_busy", /* 22 */
+    "authtok_disable_aging", /* 23 */
+    "try_again",         /* 24 */
+    "ignore",            /* 25 */
+    "abort",             /* 26 */
+    "authtok_expired",   /* 27 */
+    "module_unknown",    /* 28 */
+    "bad_item",          /* 29 */
+    "conv_again",        /* 30 */
+    "incomplete",        /* 31 */
+/* add new return codes here */
+    "default"            /* this is _PAM_RETURN_VALUES and indicates
+			    the default return action */
+};
+
+/*
+ * Copyright (C) 1998,2001 Andrew G. Morgan <morgan@kernel.org>
+ *
+ * All rights reserved
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#endif /* _PAM_PRIVATE_H_ */
diff --git a/libpam/pam_vprompt.c b/libpam/pam_vprompt.c
new file mode 100644
index 0000000..c53079b
--- /dev/null
+++ b/libpam/pam_vprompt.c
@@ -0,0 +1,115 @@
+/*
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, and the entire permission notice in its entirety,
+ *    including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ *    products derived from this software without specific prior
+ *    written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions.  (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdarg.h>
+#include <errno.h>
+
+#include <security/pam_modules.h>
+#include <security/_pam_macros.h>
+#include <security/pam_ext.h>
+
+#include "pam_private.h"
+
+int
+pam_vprompt (pam_handle_t *pamh, int style, char **response,
+	     const char *fmt, va_list args)
+{
+  struct pam_message msg;
+  struct pam_response *pam_resp = NULL;
+  const struct pam_message *pmsg;
+  const struct pam_conv *conv;
+  const void *convp;
+  char *msgbuf;
+  int retval;
+
+  if (response)
+    *response = NULL;
+
+  retval = pam_get_item (pamh, PAM_CONV, &convp);
+  if (retval != PAM_SUCCESS)
+    return retval;
+  conv = convp;
+  if (conv == NULL || conv->conv == NULL)
+    {
+      pam_syslog (pamh, LOG_ERR, "no conversation function");
+      return PAM_SYSTEM_ERR;
+    }
+
+  if (vasprintf (&msgbuf, fmt, args) < 0)
+    {
+      pam_syslog (pamh, LOG_ERR, "vasprintf: %m");
+      return PAM_BUF_ERR;
+    }
+
+  msg.msg_style = style;
+  msg.msg = msgbuf;
+  pmsg = &msg;
+
+  retval = conv->conv (1, &pmsg, &pam_resp, conv->appdata_ptr);
+  if (retval != PAM_SUCCESS && pam_resp != NULL)
+    pam_syslog(pamh, LOG_WARNING,
+      "unexpected response from failed conversation function");
+  if (response)
+    *response = pam_resp == NULL ? NULL : pam_resp->resp;
+  else if (pam_resp && pam_resp->resp)
+    {
+      _pam_overwrite (pam_resp->resp);
+      _pam_drop (pam_resp->resp);
+    }
+  _pam_overwrite (msgbuf);
+  _pam_drop (pam_resp);
+  free (msgbuf);
+  if (retval != PAM_SUCCESS)
+    pam_syslog (pamh, LOG_ERR, "conversation failed");
+
+  return retval;
+}
+
+int
+pam_prompt (pam_handle_t *pamh, int style, char **response,
+	    const char *fmt, ...)
+{
+  va_list args;
+  int retval;
+
+  va_start (args, fmt);
+  retval = pam_vprompt (pamh, style, response, fmt, args);
+  va_end (args);
+
+  return retval;
+}
diff --git a/libpam_misc/Makefile.am b/libpam_misc/Makefile.am
new file mode 100644
index 0000000..4f01d32
--- /dev/null
+++ b/libpam_misc/Makefile.am
@@ -0,0 +1,26 @@
+#
+# Copyright (c) 2005 Thorsten Kukuk <kukuk@suse.de>
+#
+
+CLEANFILES = *~
+
+EXTRA_DIST = libpam_misc.map
+
+include_HEADERS = include/security/pam_misc.h
+
+AM_CFLAGS = -I$(top_srcdir)/libpam/include \
+	-I$(top_srcdir)/libpamc/include -I$(srcdir)/include $(WARN_CFLAGS)
+
+libpam_misc_la_LDFLAGS = -no-undefined -version-info 82:1:82
+if HAVE_VERSIONING
+  libpam_misc_la_LDFLAGS += -Wl,--version-script=$(srcdir)/libpam_misc.map
+endif
+libpam_misc_la_LIBADD = $(top_builddir)/libpam/libpam.la
+
+lib_LTLIBRARIES = libpam_misc.la
+
+libpam_misc_la_SOURCES = help_env.c misc_conv.c
+
+# Pkg-config script.
+pkgconfigdir = $(libdir)/pkgconfig
+pkgconfig_DATA = pam_misc.pc
diff --git a/libpam_misc/Makefile.in b/libpam_misc/Makefile.in
new file mode 100644
index 0000000..9ce0691
--- /dev/null
+++ b/libpam_misc/Makefile.in
@@ -0,0 +1,806 @@
+# Makefile.in generated by automake 1.16.3 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+#
+# Copyright (c) 2005 Thorsten Kukuk <kukuk@suse.de>
+#
+
+
+
+VPATH = @srcdir@
+am__is_gnu_make = { \
+  if test -z '$(MAKELEVEL)'; then \
+    false; \
+  elif test -n '$(MAKE_HOST)'; then \
+    true; \
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+	  if test -f "$$i"; then \
+	    echo "$(subdir)/$$i"; \
+	  else \
+	    echo "$$sdir/$$i"; \
+	  fi; \
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+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/libpam_misc/help_env.c b/libpam_misc/help_env.c
new file mode 100644
index 0000000..601c5f4
--- /dev/null
+++ b/libpam_misc/help_env.c
@@ -0,0 +1,88 @@
+/*
+ * $Id$
+ *
+ * This file was written by Andrew G. Morgan <morgan@parc.power.net>
+ *
+ */
+
+#include "config.h"
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <security/pam_misc.h>
+
+/*
+ * This function should be used to carefully dispose of the copied
+ * environment.
+ *
+ *     usage:     env = pam_misc_drop_env(env);
+ */
+
+char **pam_misc_drop_env(char **dump)
+{
+    int i;
+
+    for (i=0; dump[i] != NULL; ++i) {
+	D(("dump[%d]=`%s'", i, dump[i]));
+	_pam_overwrite(dump[i]);
+	_pam_drop(dump[i]);
+    }
+    _pam_drop(dump);
+
+    return NULL;
+}
+
+/*
+ *  This function takes the supplied environment and uploads it to be
+ *  the PAM one.
+ */
+
+int pam_misc_paste_env(pam_handle_t *pamh, const char * const * user_env)
+{
+    for (; user_env && *user_env; ++user_env) {
+	int retval;
+
+	D(("uploading: %s", *user_env));
+	retval = pam_putenv(pamh, *user_env);
+	if (retval != PAM_SUCCESS) {
+	    D(("error setting %s: %s", *user_env, pam_strerror(pamh,retval)));
+	    return retval;
+	}
+    }
+    D(("done."));
+    return PAM_SUCCESS;
+}
+
+/*
+ * This is a wrapper to make pam behave in the way that setenv() does.
+ */
+
+int pam_misc_setenv(pam_handle_t *pamh, const char *name
+		    , const char *value, int readonly)
+{
+    char *tmp;
+    int retval;
+
+    if (readonly) {
+	const char *etmp;
+
+	/* we check if the variable is there already */
+	etmp = pam_getenv(pamh, name);
+	if (etmp != NULL) {
+	    D(("failed to set readonly variable: %s", name));
+	    return PAM_PERM_DENIED;          /* not allowed to overwrite */
+	}
+    }
+    if (asprintf(&tmp, "%s=%s", name, value) >= 0) {
+	D(("pam_putt()ing: %s", tmp));
+	retval = pam_putenv(pamh, tmp);
+	_pam_overwrite(tmp);                 /* purge */
+	_pam_drop(tmp);                      /* forget */
+    } else {
+	D(("malloc failure"));
+	retval = PAM_BUF_ERR;
+    }
+
+    return retval;
+}
diff --git a/libpam_misc/include/security/pam_misc.h b/libpam_misc/include/security/pam_misc.h
new file mode 100644
index 0000000..fca2422
--- /dev/null
+++ b/libpam_misc/include/security/pam_misc.h
@@ -0,0 +1,52 @@
+/* $Id$ */
+
+#ifndef __PAMMISC_H
+#define __PAMMISC_H
+
+#include <security/pam_appl.h>
+#include <security/pam_client.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+
+/* include some useful macros */
+
+#include <security/_pam_macros.h>
+
+/* functions defined in pam_misc.* libraries */
+
+extern int misc_conv(int num_msg, const struct pam_message **msgm,
+		     struct pam_response **response, void *appdata_ptr);
+
+#include <time.h>
+
+extern time_t pam_misc_conv_warn_time; /* time that we should warn user */
+extern time_t pam_misc_conv_die_time;         /* cut-off time for input */
+extern const char *pam_misc_conv_warn_line;           /* warning notice */
+extern const char *pam_misc_conv_die_line;            /* cut-off remark */
+extern int pam_misc_conv_died;      /* 1 = cut-off time reached (0 not) */
+extern int (*pam_binary_handler_fn)(void *appdata, pamc_bp_t *prompt_p);
+extern void (*pam_binary_handler_free)(void *appdata, pamc_bp_t *prompt_p);
+/*
+ * Environment helper functions
+ */
+
+/* transcribe given environment (to pam) */
+extern int pam_misc_paste_env(pam_handle_t *pamh
+			      , const char * const * user_env);
+
+/* delete environment as obtained from (pam_getenvlist) */
+extern char **pam_misc_drop_env(char **env);
+
+/* provide something like the POSIX setenv function for the (Linux-)PAM
+ * environment. */
+
+extern int pam_misc_setenv(pam_handle_t *pamh, const char *name
+			   , const char *value, int readonly);
+
+#ifdef __cplusplus
+}
+#endif /* def __cplusplus */
+
+#endif /* ndef __PAMMISC_H */
diff --git a/libpam_misc/libpam_misc.map b/libpam_misc/libpam_misc.map
new file mode 100644
index 0000000..2f28d5c
--- /dev/null
+++ b/libpam_misc/libpam_misc.map
@@ -0,0 +1,17 @@
+LIBPAM_MISC_1.0 {
+  global:
+    misc_conv;
+    pam_misc_conv_warn_time;
+    pam_misc_conv_die_time;
+    pam_misc_conv_warn_line;
+    pam_misc_conv_die_line;
+    pam_misc_conv_died;
+    pam_binary_handler_fn;
+    pam_binary_handler_free;
+    pam_misc_paste_env;
+    pam_misc_drop_env;
+    pam_misc_setenv;
+
+  local:
+    *;
+};
diff --git a/libpam_misc/misc_conv.c b/libpam_misc/misc_conv.c
new file mode 100644
index 0000000..908ee89
--- /dev/null
+++ b/libpam_misc/misc_conv.c
@@ -0,0 +1,401 @@
+/*
+ * A generic conversation function for text based applications
+ *
+ * Written by Andrew Morgan <morgan@linux.kernel.org>
+ */
+
+#include "config.h"
+
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/types.h>
+#include <termios.h>
+#include <time.h>
+#include <unistd.h>
+
+#include <security/pam_appl.h>
+#include <security/pam_misc.h>
+
+#define INPUTSIZE PAM_MISC_CONV_BUFSIZE      /* maximum length of input+1 */
+#define CONV_ECHO_ON  1                            /* types of echo state */
+#define CONV_ECHO_OFF 0
+
+/*
+ * external timeout definitions - these can be overridden by the
+ * application.
+ */
+
+time_t pam_misc_conv_warn_time = 0;                  /* time when we warn */
+time_t pam_misc_conv_die_time  = 0;               /* time when we timeout */
+
+const char *pam_misc_conv_warn_line = N_("...Time is running out...\n");
+const char *pam_misc_conv_die_line  = N_("...Sorry, your time is up!\n");
+
+int pam_misc_conv_died=0;       /* application can probe this for timeout */
+
+/*
+ * These functions are for binary prompt manipulation.
+ * The manner in which a binary prompt is processed is application
+ * specific, so these function pointers are provided and can be
+ * initialized by the application prior to the conversation function
+ * being used.
+ */
+
+static void pam_misc_conv_delete_binary(void *appdata UNUSED,
+					pamc_bp_t *delete_me)
+{
+    PAM_BP_RENEW(delete_me, 0, 0);
+}
+
+int (*pam_binary_handler_fn)(void *appdata, pamc_bp_t *prompt_p) = NULL;
+void (*pam_binary_handler_free)(void *appdata, pamc_bp_t *prompt_p)
+      = pam_misc_conv_delete_binary;
+
+/* the following code is used to get text input */
+
+static volatile int expired=0;
+
+/* return to the previous signal handling */
+static void reset_alarm(struct sigaction *o_ptr)
+{
+    (void) alarm(0);                 /* stop alarm clock - if still ticking */
+    (void) sigaction(SIGALRM, o_ptr, NULL);
+}
+
+/* this is where we intercept the alarm signal */
+static void time_is_up(int ignore UNUSED)
+{
+    expired = 1;
+}
+
+/* set the new alarm to hit the time_is_up() function */
+static int set_alarm(int delay, struct sigaction *o_ptr)
+{
+    struct sigaction new_sig;
+
+    sigemptyset(&new_sig.sa_mask);
+    new_sig.sa_flags = 0;
+    new_sig.sa_handler = time_is_up;
+    if ( sigaction(SIGALRM, &new_sig, o_ptr) ) {
+	return 1;         /* setting signal failed */
+    }
+    if ( alarm(delay) ) {
+	(void) sigaction(SIGALRM, o_ptr, NULL);
+	return 1;         /* failed to set alarm */
+    }
+    return 0;             /* all seems to have worked */
+}
+
+/* return the number of seconds to next alarm. 0 = no delay, -1 = expired */
+static int get_delay(void)
+{
+    time_t now;
+
+    expired = 0;                                        /* reset flag */
+    (void) time(&now);
+
+    /* has the quit time past? */
+    if (pam_misc_conv_die_time && now >= pam_misc_conv_die_time) {
+	fprintf(stderr,"%s",pam_misc_conv_die_line);
+
+	pam_misc_conv_died = 1;       /* note we do not reset the die_time */
+	return -1;                                           /* time is up */
+    }
+
+    /* has the warning time past? */
+    if (pam_misc_conv_warn_time && now >= pam_misc_conv_warn_time) {
+	fprintf(stderr, "%s", pam_misc_conv_warn_line);
+	pam_misc_conv_warn_time = 0;                    /* reset warn_time */
+
+	/* indicate remaining delay - if any */
+
+	return (pam_misc_conv_die_time ? pam_misc_conv_die_time - now:0 );
+    }
+
+    /* indicate possible warning delay */
+
+    if (pam_misc_conv_warn_time)
+	return (pam_misc_conv_warn_time - now);
+    else if (pam_misc_conv_die_time)
+	return (pam_misc_conv_die_time - now);
+    else
+	return 0;
+}
+
+/* read a line of input string, giving prompt when appropriate */
+static int read_string(int echo, const char *prompt, char **retstr)
+{
+    struct termios term_before, term_tmp;
+    char line[INPUTSIZE];
+    struct sigaction old_sig;
+    int delay, nc = -1, have_term = 0;
+    sigset_t oset, nset;
+
+    D(("called with echo='%s', prompt='%s'.", echo ? "ON":"OFF" , prompt));
+
+    if (isatty(STDIN_FILENO)) {                      /* terminal state */
+
+	/* is a terminal so record settings and flush it */
+	if ( tcgetattr(STDIN_FILENO, &term_before) != 0 ) {
+	    D(("<error: failed to get terminal settings>"));
+	    *retstr = NULL;
+	    return -1;
+	}
+	memcpy(&term_tmp, &term_before, sizeof(term_tmp));
+	if (!echo) {
+	    term_tmp.c_lflag &= ~(ECHO);
+	}
+	have_term = 1;
+
+	/*
+	 * We make a simple attempt to block TTY signals from suspending
+	 * the conversation without giving PAM a chance to clean up.
+	 */
+
+	sigemptyset(&nset);
+	sigaddset(&nset, SIGTSTP);
+	(void) sigprocmask(SIG_BLOCK, &nset, &oset);
+
+    } else if (!echo) {
+	D(("<warning: cannot turn echo off>"));
+    }
+
+    /* set up the signal handling */
+    delay = get_delay();
+
+    /* reading the line */
+    while (delay >= 0) {
+	/* this may, or may not set echo off -- drop pending input */
+	if (have_term)
+	    (void) tcsetattr(STDIN_FILENO, TCSAFLUSH, &term_tmp);
+
+	fprintf(stderr, "%s", prompt);
+
+	if ( delay > 0 && set_alarm(delay, &old_sig) ) {
+	    D(("<failed to set alarm>"));
+	    break;
+	} else {
+	    if (have_term)
+		nc = read(STDIN_FILENO, line, INPUTSIZE-1);
+	    else                             /* we must read one line only */
+		for (nc = 0; nc < INPUTSIZE-1 && (nc?line[nc-1]:0) != '\n';
+		     nc++) {
+		    int rv;
+		    if ((rv=read(STDIN_FILENO, line+nc, 1)) != 1) {
+			if (rv < 0) {
+			    _pam_overwrite_n(line, (unsigned int) nc);
+			    nc = rv;
+			}
+			break;
+		    }
+		}
+	    if (have_term) {
+		(void) tcsetattr(STDIN_FILENO, TCSADRAIN, &term_before);
+		if (!echo || expired)             /* do we need a newline? */
+		    fprintf(stderr, "\n");
+	    }
+	    if ( delay > 0 ) {
+		reset_alarm(&old_sig);
+	    }
+	    if (expired) {
+		delay = get_delay();
+	    } else if (nc > 0) {                 /* we got some user input */
+		D(("we got some user input"));
+
+		if (line[nc-1] == '\n') {     /* <NUL> terminate */
+		    line[--nc] = '\0';
+		} else {
+		    if (echo) {
+			fprintf(stderr, "\n");
+		    }
+		    line[nc] = '\0';
+		}
+		*retstr = strdup(line);
+		_pam_overwrite(line);
+		if (!*retstr) {
+		    D(("no memory for response string"));
+		    nc = -1;
+		}
+
+		goto cleanexit;                /* return malloc()ed string */
+
+	    } else if (nc == 0) {                                /* Ctrl-D */
+		D(("user did not want to type anything"));
+
+		*retstr = NULL;
+		if (echo) {
+		    fprintf(stderr, "\n");
+		}
+		goto cleanexit;                /* return malloc()ed "" */
+	    } else if (nc == -1) {
+		/* Don't loop forever if read() returns -1. */
+		D(("error reading input from the user: %m"));
+		if (echo) {
+		    fprintf(stderr, "\n");
+		}
+		*retstr = NULL;
+		goto cleanexit;                /* return NULL */
+	    }
+	}
+    }
+
+    /* getting here implies that the timer expired */
+
+    D(("the timer appears to have expired"));
+
+    *retstr = NULL;
+    _pam_overwrite_n(line, sizeof(line));
+
+ cleanexit:
+
+    if (have_term) {
+	(void) sigprocmask(SIG_SETMASK, &oset, NULL);
+	(void) tcsetattr(STDIN_FILENO, TCSAFLUSH, &term_before);
+    }
+
+    return nc;
+}
+
+/* end of read_string functions */
+
+/*
+ * This conversation function is supposed to be a generic PAM one.
+ * Unfortunately, it is _not_ completely compatible with the Solaris PAM
+ * codebase.
+ *
+ * Namely, for msgm's that contain multiple prompts, this function
+ * interprets "const struct pam_message **msgm" as equivalent to
+ * "const struct pam_message *msgm[]". The Solaris module
+ * implementation interprets the **msgm object as a pointer to a
+ * pointer to an array of "struct pam_message" objects (that is, a
+ * confusing amount of pointer indirection).
+ */
+
+int misc_conv(int num_msg, const struct pam_message **msgm,
+	      struct pam_response **response, void *appdata_ptr)
+{
+    int count=0;
+    struct pam_response *reply;
+
+    if (num_msg <= 0)
+	return PAM_CONV_ERR;
+
+    D(("allocating empty response structure array."));
+
+    reply = (struct pam_response *) calloc(num_msg,
+					   sizeof(struct pam_response));
+    if (reply == NULL) {
+	D(("no memory for responses"));
+	return PAM_CONV_ERR;
+    }
+
+    D(("entering conversation function."));
+
+    for (count=0; count < num_msg; ++count) {
+	char *string=NULL;
+	int nc;
+
+	switch (msgm[count]->msg_style) {
+	case PAM_PROMPT_ECHO_OFF:
+	    nc = read_string(CONV_ECHO_OFF,msgm[count]->msg, &string);
+	    if (nc < 0) {
+		goto failed_conversation;
+	    }
+	    break;
+	case PAM_PROMPT_ECHO_ON:
+	    nc = read_string(CONV_ECHO_ON,msgm[count]->msg, &string);
+	    if (nc < 0) {
+		goto failed_conversation;
+	    }
+	    break;
+	case PAM_ERROR_MSG:
+	    if (fprintf(stderr,"%s\n",msgm[count]->msg) < 0) {
+		goto failed_conversation;
+	    }
+	    break;
+	case PAM_TEXT_INFO:
+	    if (fprintf(stdout,"%s\n",msgm[count]->msg) < 0) {
+		goto failed_conversation;
+	    }
+	    break;
+	case PAM_BINARY_PROMPT:
+	{
+	    pamc_bp_t binary_prompt = NULL;
+
+	    if (!msgm[count]->msg || !pam_binary_handler_fn) {
+		goto failed_conversation;
+	    }
+
+	    PAM_BP_RENEW(&binary_prompt,
+			 PAM_BP_RCONTROL(msgm[count]->msg),
+			 PAM_BP_LENGTH(msgm[count]->msg));
+	    PAM_BP_FILL(binary_prompt, 0, PAM_BP_LENGTH(msgm[count]->msg),
+			PAM_BP_RDATA(msgm[count]->msg));
+
+	    if (pam_binary_handler_fn(appdata_ptr,
+				      &binary_prompt) != PAM_SUCCESS
+		|| (binary_prompt == NULL)) {
+		goto failed_conversation;
+	    }
+	    string = (char *) binary_prompt;
+	    binary_prompt = NULL;
+
+	    break;
+	}
+	default:
+	    fprintf(stderr, _("erroneous conversation (%d)\n"),
+		   msgm[count]->msg_style);
+	    goto failed_conversation;
+	}
+
+	if (string) {                         /* must add to reply array */
+	    /* add string to list of responses */
+
+	    reply[count].resp_retcode = 0;
+	    reply[count].resp = string;
+	    string = NULL;
+	}
+    }
+
+    *response = reply;
+    reply = NULL;
+
+    return PAM_SUCCESS;
+
+failed_conversation:
+
+    D(("the conversation failed"));
+
+    if (reply) {
+	for (count=0; count<num_msg; ++count) {
+	    if (reply[count].resp == NULL) {
+		continue;
+	    }
+	    switch (msgm[count]->msg_style) {
+	    case PAM_PROMPT_ECHO_ON:
+	    case PAM_PROMPT_ECHO_OFF:
+		_pam_overwrite(reply[count].resp);
+		free(reply[count].resp);
+		break;
+	    case PAM_BINARY_PROMPT:
+	      {
+		void *bt_ptr = reply[count].resp;
+		pam_binary_handler_free(appdata_ptr, bt_ptr);
+		break;
+	      }
+	    case PAM_ERROR_MSG:
+	    case PAM_TEXT_INFO:
+		/* should not actually be able to get here... */
+		free(reply[count].resp);
+	    }
+	    reply[count].resp = NULL;
+	}
+	/* forget reply too */
+	free(reply);
+	reply = NULL;
+    }
+
+    return PAM_CONV_ERR;
+}
diff --git a/libpam_misc/pam_misc.pc.in b/libpam_misc/pam_misc.pc.in
new file mode 100644
index 0000000..0c8898c
--- /dev/null
+++ b/libpam_misc/pam_misc.pc.in
@@ -0,0 +1,9 @@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: pam_misc
+Description: Miscellaneous functions that make the job of writing PAM-aware applications easier.
+URL: http://www.linux-pam.org/
+Version: @VERSION@
+Cflags: -I${includedir}
+Libs: -L${libdir} -lpam_misc
diff --git a/libpamc/License b/libpamc/License
new file mode 100644
index 0000000..9316078
--- /dev/null
+++ b/libpamc/License
@@ -0,0 +1,41 @@
+Unless otherwise *explicitly* stated the following text describes the
+licensed conditions under which the contents of this libpamc release
+may be distributed:
+
+-------------------------------------------------------------------------
+Redistribution and use in source and binary forms of libpamc,
+with or without modification, are permitted provided that the
+following conditions are met:
+
+1. Redistributions of source code must retain any existing copyright
+   notice, and this entire permission notice in its entirety,
+   including the disclaimer of warranties.
+
+2. Redistributions in binary form must reproduce all prior and current
+   copyright notices, this list of conditions, and the following
+   disclaimer in the documentation and/or other materials provided
+   with the distribution.
+
+3. The name of any author may not be used to endorse or promote
+   products derived from this software without their specific prior
+   written permission.
+
+ALTERNATIVELY, this product may be distributed under the terms of the
+GNU Library General Public License (LGPL), in which case the
+provisions of the GNU LGPL are required INSTEAD OF the above
+restrictions.  (This clause is necessary due to a potential conflict
+between the GNU LGPL and the restrictions contained in a BSD-style
+copyright.)
+
+THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
+WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
+IN NO EVENT SHALL THE AUTHOR(S) BE LIABLE FOR ANY DIRECT, INDIRECT,
+INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
+OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
+TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
+USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
+DAMAGE.
+-------------------------------------------------------------------------
diff --git a/libpamc/Makefile.am b/libpamc/Makefile.am
new file mode 100644
index 0000000..2ebeadc
--- /dev/null
+++ b/libpamc/Makefile.am
@@ -0,0 +1,28 @@
+#
+# Copyright (c) 2005 Thorsten Kukuk <kukuk@suse.de>
+#
+
+SUBDIRS = test
+
+CLEANFILES = *~
+
+EXTRA_DIST = License libpamc.map
+
+include_HEADERS = include/security/pam_client.h
+
+noinst_HEADERS = libpamc.h
+
+AM_CFLAGS=-I$(top_srcdir)/libpam/include -I$(srcdir)/include $(WARN_CFLAGS)
+
+libpamc_la_LDFLAGS = -no-undefined -version-info 82:1:82
+if HAVE_VERSIONING
+  libpamc_la_LDFLAGS += -Wl,--version-script=$(srcdir)/libpamc.map
+endif
+
+lib_LTLIBRARIES = libpamc.la
+
+libpamc_la_SOURCES = pamc_client.c pamc_converse.c pamc_load.c
+
+# Pkg-config script.
+pkgconfigdir = $(libdir)/pkgconfig
+pkgconfig_DATA = pamc.pc
diff --git a/libpamc/Makefile.in b/libpamc/Makefile.in
new file mode 100644
index 0000000..424c175
--- /dev/null
+++ b/libpamc/Makefile.in
@@ -0,0 +1,924 @@
+# Makefile.in generated by automake 1.16.3 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
+
+#
+# Copyright (c) 2005 Thorsten Kukuk <kukuk@suse.de>
+#
+
+
+
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+am__uninstall_files_from_dir = { \
+  test -z "$$files" \
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+         $(am__cd) "$$dir" && rm -f $$files; }; \
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+am__installdirs = "$(DESTDIR)$(libdir)" "$(DESTDIR)$(pkgconfigdir)" \
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+am__mv = mv -f
+COMPILE = $(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(AM_CPPFLAGS) \
+	$(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS)
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+
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+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
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+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+	@list='$(DIST_SUBDIRS)'; for subdir in $$list; do \
+	  if test "$$subdir" = .; then :; else \
+	    $(am__make_dryrun) \
+	      || test -d "$(distdir)/$$subdir" \
+	      || $(MKDIR_P) "$(distdir)/$$subdir" \
+	      || exit 1; \
+	    dir1=$$subdir; dir2="$(distdir)/$$subdir"; \
+	    $(am__relativize); \
+	    new_distdir=$$reldir; \
+	    dir1=$$subdir; dir2="$(top_distdir)"; \
+	    $(am__relativize); \
+	    new_top_distdir=$$reldir; \
+	    echo " (cd $$subdir && $(MAKE) $(AM_MAKEFLAGS) top_distdir="$$new_top_distdir" distdir="$$new_distdir" \\"; \
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+	done
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+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
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+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
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+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+	-test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
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+	@echo "it deletes files that may require special tools to rebuild."
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+
+clean-am: clean-generic clean-libLTLIBRARIES clean-libtool \
+	mostlyclean-am
+
+distclean: distclean-recursive
+		-rm -f ./$(DEPDIR)/pamc_client.Plo
+	-rm -f ./$(DEPDIR)/pamc_converse.Plo
+	-rm -f ./$(DEPDIR)/pamc_load.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
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+dvi: dvi-recursive
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+maintainer-clean: maintainer-clean-recursive
+		-rm -f ./$(DEPDIR)/pamc_client.Plo
+	-rm -f ./$(DEPDIR)/pamc_converse.Plo
+	-rm -f ./$(DEPDIR)/pamc_load.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
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+	mostlyclean-libtool
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+.MAKE: $(am__recursive_targets) install-am install-strip
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+	am--depfiles check check-am clean clean-generic \
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+	ctags-am distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
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+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am \
+	install-includeHEADERS install-info install-info-am \
+	install-libLTLIBRARIES install-man install-pdf install-pdf-am \
+	install-pkgconfigDATA install-ps install-ps-am install-strip \
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+	maintainer-clean maintainer-clean-generic mostlyclean \
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+	pdf pdf-am ps ps-am tags tags-am uninstall uninstall-am \
+	uninstall-includeHEADERS uninstall-libLTLIBRARIES \
+	uninstall-pkgconfigDATA
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+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/libpamc/include/security/pam_client.h b/libpamc/include/security/pam_client.h
new file mode 100644
index 0000000..41f83da
--- /dev/null
+++ b/libpamc/include/security/pam_client.h
@@ -0,0 +1,197 @@
+/*
+ * $Id$
+ *
+ * Copyright (c) 1999 Andrew G. Morgan <morgan@linux.kernel.org>
+ *
+ * This header file provides the prototypes for the PAM client API
+ */
+
+#ifndef PAM_CLIENT_H
+#define PAM_CLIENT_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif /* def __cplusplus */
+
+#include <unistd.h>
+#include <string.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <sys/types.h>
+
+/* opaque agent handling structure */
+
+typedef struct pamc_handle_s *pamc_handle_t;
+
+/* binary prompt structure pointer */
+typedef struct { uint32_t length; uint8_t control; } *pamc_bp_t;
+
+/*
+ * functions provided by libpamc
+ */
+
+/*
+ * Initialize the agent abstraction library
+ */
+
+pamc_handle_t pamc_start(void);
+
+/*
+ * Terminate the authentication process
+ */
+
+int pamc_end(pamc_handle_t *pch);
+
+/*
+ * force the loading of a specified agent
+ */
+
+int pamc_load(pamc_handle_t pch, const char *agent_id);
+
+/*
+ * Single conversation interface for binary prompts
+ */
+
+int pamc_converse(pamc_handle_t pch, pamc_bp_t *prompt_p);
+
+/*
+ * disable an agent
+ */
+
+int pamc_disable(pamc_handle_t pch, const char *agent_id);
+
+/*
+ * obtain a list of available agents
+ */
+
+char **pamc_list_agents(pamc_handle_t pch);
+
+/*
+ * PAM_BP_ MACROS for creating, destroying and manipulating binary prompts
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+
+#ifndef PAM_BP_ASSERT
+# ifdef NDEBUG
+#  define PAM_BP_ASSERT(x)   do {} while (0)
+# else
+#  define PAM_BP_ASSERT(x)   do { printf(__FILE__ "(%d): %s\n", \
+					 __LINE__, x) ; exit(1); } while (0)
+# endif /* NDEBUG */
+#endif /* PAM_BP_ASSERT */
+
+#ifndef PAM_BP_CALLOC
+# define PAM_BP_CALLOC      calloc
+#endif /* PAM_BP_CALLOC */
+
+#ifndef PAM_BP_FREE
+# define PAM_BP_FREE        free
+#endif /* PAM_BP_FREE */
+
+#define __PAM_BP_WOCTET(x,y)  (*((y) + (uint8_t *)(x)))
+#define __PAM_BP_ROCTET(x,y)  (*((y) + (const uint8_t *)(x)))
+
+#define PAM_BP_MIN_SIZE       (sizeof(uint32_t) + sizeof(uint8_t))
+#define PAM_BP_MAX_LENGTH     0x20000                   /* an advisory limit */
+#define PAM_BP_WCONTROL(x)    (__PAM_BP_WOCTET(x,4))
+#define PAM_BP_RCONTROL(x)    (__PAM_BP_ROCTET(x,4))
+#define PAM_BP_SIZE(x)        ((__PAM_BP_ROCTET(x,0)<<24)+      \
+			       (__PAM_BP_ROCTET(x,1)<<16)+      \
+			       (__PAM_BP_ROCTET(x,2)<< 8)+      \
+			       (__PAM_BP_ROCTET(x,3)    ))
+#define PAM_BP_LENGTH(x)      (PAM_BP_SIZE(x) - PAM_BP_MIN_SIZE)
+#define PAM_BP_WDATA(x)       (PAM_BP_MIN_SIZE + (uint8_t *) (x))
+#define PAM_BP_RDATA(x)       (PAM_BP_MIN_SIZE + (const uint8_t *) (x))
+
+/* Note, this macro always '\0' terminates renewed packets */
+
+#define PAM_BP_RENEW(old_p, cntrl, data_length)                            \
+do {                                                                       \
+    if ((old_p) != NULL) {                                                 \
+	if (*(old_p)) {                                                    \
+	    uint32_t __size;                                              \
+            __size = PAM_BP_SIZE(*(old_p));                                \
+	    memset(*(old_p), 0, __size);                                   \
+	    PAM_BP_FREE(*(old_p));                                         \
+	}                                                                  \
+	if (cntrl) {                                                       \
+	    uint32_t __size;                                              \
+                                                                           \
+	    __size = PAM_BP_MIN_SIZE + data_length;                        \
+	    if ((*(old_p) = PAM_BP_CALLOC(1, 1+__size))) {                 \
+		__PAM_BP_WOCTET(*(old_p), 3) =  __size      & 0xFF;        \
+		__PAM_BP_WOCTET(*(old_p), 2) = (__size>>=8) & 0xFF;        \
+		__PAM_BP_WOCTET(*(old_p), 1) = (__size>>=8) & 0xFF;        \
+		__PAM_BP_WOCTET(*(old_p), 0) = (__size>>=8) & 0xFF;        \
+		(*(old_p))->control = cntrl;                               \
+	    } else {                                                       \
+		PAM_BP_ASSERT("out of memory for binary prompt");          \
+	    }                                                              \
+	} else {                                                           \
+	    *old_p = NULL;                                                 \
+	}                                                                  \
+    } else {                                                               \
+	PAM_BP_ASSERT("programming error, invalid binary prompt pointer"); \
+    }                                                                      \
+} while (0)
+
+#define PAM_BP_FILL(prmpt, offset, length, data)                           \
+do {                                                                       \
+    size_t bp_length;                                                      \
+    uint8_t *prompt = (uint8_t *) (prmpt);                               \
+    bp_length = PAM_BP_LENGTH(prompt);                                     \
+    if (bp_length < ((length)+(offset))) {                                 \
+	PAM_BP_ASSERT("attempt to write over end of prompt");              \
+    }                                                                      \
+    memcpy((offset) + PAM_BP_WDATA(prompt), (data), (length));             \
+} while (0)
+
+#define PAM_BP_EXTRACT(prmpt, offset, length, data)                        \
+do {                                                                       \
+    size_t __bp_length;                                                    \
+    const uint8_t *__prompt = (const uint8_t *) (prmpt);                 \
+    __bp_length = PAM_BP_LENGTH(__prompt);                                 \
+    if (((offset) < 0) || (__bp_length < ((length)+(offset)))              \
+	|| ((length) < 0)) {                                               \
+	PAM_BP_ASSERT("invalid extraction from prompt");                   \
+    }                                                                      \
+    memcpy((data), (offset) + PAM_BP_RDATA(__prompt), (length));           \
+} while (0)
+
+
+/* Control types */
+
+#define PAM_BPC_FALSE   0
+#define PAM_BPC_TRUE    1
+
+#define PAM_BPC_OK      0x01   /* continuation packet   */
+#define PAM_BPC_SELECT  0x02   /* initialization packet */
+#define PAM_BPC_DONE    0x03   /* termination packet    */
+#define PAM_BPC_FAIL    0x04   /* unable to execute     */
+
+/* The following control characters are only legal for echanges
+   between an agent and a client (it is the responsibility of the
+   client to enforce this rule in the face of a rogue server): */
+
+#define PAM_BPC_GETENV  0x41   /* obtain client env.var */
+#define PAM_BPC_PUTENV  0x42   /* set client env.var    */
+#define PAM_BPC_TEXT    0x43   /* display message       */
+#define PAM_BPC_ERROR   0x44   /* display error message */
+#define PAM_BPC_PROMPT  0x45   /* echo'd text prompt    */
+#define PAM_BPC_PASS    0x46   /* non-echo'd text prompt*/
+
+/* quick check for prompts that are legal for the client (by
+   implication the server too) to send to libpamc */
+
+#define PAM_BPC_FOR_CLIENT(/* pamc_bp_t */ prompt)                            \
+    (((prompt)->control <= PAM_BPC_FAIL && (prompt)->control >= PAM_BPC_OK)   \
+     ? PAM_BPC_TRUE:PAM_BPC_FALSE)
+
+#ifdef __cplusplus
+}
+#endif /* def __cplusplus */
+
+#endif /* PAM_CLIENT_H */
diff --git a/libpamc/libpamc.h b/libpamc/libpamc.h
new file mode 100644
index 0000000..cdc7724
--- /dev/null
+++ b/libpamc/libpamc.h
@@ -0,0 +1,66 @@
+/*
+ * $Id$
+ *
+ * Copyright (c) Andrew G. Morgan <morgan@ftp.kernel.org>
+ *
+ */
+
+#ifndef LIBPAMC_H
+#define LIBPAMC_H
+
+#include "config.h"
+
+#include <security/pam_client.h>
+#include <security/_pam_macros.h>
+
+#include <sys/stat.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <sys/wait.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <ctype.h>
+
+#define _PAMC_DEFAULT_TOP_FD  10
+
+struct pamc_handle_s {
+    struct pamc_agent_s *current;
+    struct pamc_agent_s *chain;
+    struct pamc_blocked_s *blocked_agents;
+    int max_path;
+    char **agent_paths;
+    int combined_status;
+    int highest_fd_to_close;
+};
+
+typedef struct pamc_blocked_s {
+    char *id;                       /* <NUL> terminated */
+    struct pamc_blocked_s *next;
+} pamc_blocked_t;
+
+typedef struct pamc_agent_s {
+    char *id;
+    int id_length;
+    struct pamc_agent_s *next;
+    int writer;   /* write to agent */
+    int reader;   /* read from agent */
+    pid_t pid;    /* agent process id */
+} pamc_agent_t;
+
+/* used to build a tree of unique, sorted agent ids */
+
+typedef struct pamc_id_node {
+    struct pamc_id_node *left, *right;
+    int child_count;
+    char *agent_id;
+} pamc_id_node_t;
+
+/* internal function */
+int __pamc_valid_agent_id(int id_length, const char *id);
+
+#define PAMC_SYSTEM_AGENT_PATH        "/lib/pamc:/usr/lib/pamc"
+#define PAMC_SYSTEM_AGENT_SEPARATOR   ':'
+
+#endif /* LIBPAMC_H */
diff --git a/libpamc/libpamc.map b/libpamc/libpamc.map
new file mode 100644
index 0000000..cc61a33
--- /dev/null
+++ b/libpamc/libpamc.map
@@ -0,0 +1,12 @@
+LIBPAMC_1.0 {
+  global:
+    pamc_start;
+    pamc_end;
+    pamc_load;
+    pamc_converse;
+    pamc_disable;
+    pamc_list_agents;
+
+  local:
+    *;
+};
diff --git a/libpamc/pamc.pc.in b/libpamc/pamc.pc.in
new file mode 100644
index 0000000..25a6385
--- /dev/null
+++ b/libpamc/pamc.pc.in
@@ -0,0 +1,9 @@
+libdir=@libdir@
+includedir=@includedir@
+
+Name: libpamc
+URL: http://www.linux-pam.org/
+Description: The PAM client API library and binary prompt support. Rarely used.
+Version: @VERSION@
+Cflags: -I${includedir}
+Libs: -L${libdir} -lpamc
diff --git a/libpamc/pamc_client.c b/libpamc/pamc_client.c
new file mode 100644
index 0000000..175f424
--- /dev/null
+++ b/libpamc/pamc_client.c
@@ -0,0 +1,189 @@
+/*
+ * $Id$
+ *
+ * Copyright (c) Andrew G. Morgan <morgan@ftp.kernel.org>
+ *
+ * pamc_start and pamc_end
+ */
+
+#include "libpamc.h"
+
+/*
+ * liberate path list
+ */
+
+static void __pamc_delete_path_list(pamc_handle_t pch)
+{
+    int i;
+
+    for (i=0; pch->agent_paths[i]; ++i) {
+	free(pch->agent_paths[i]);
+	pch->agent_paths[i] = NULL;
+    }
+
+    free(pch->agent_paths);
+    pch->agent_paths = NULL;
+}
+
+/*
+ * open the pamc library
+ */
+
+pamc_handle_t pamc_start(void)
+{
+    int i, count, last, this;
+    const char *default_path;
+    pamc_handle_t pch;
+
+    pch = calloc(1, sizeof(struct pamc_handle_s));
+    if (pch == NULL) {
+	D(("no memory for *pch"));
+	return NULL;
+    }
+
+    pch->highest_fd_to_close = _PAMC_DEFAULT_TOP_FD;
+
+    default_path = getenv("PAMC_AGENT_PATH");
+    if (default_path == NULL) {
+	default_path = PAMC_SYSTEM_AGENT_PATH;
+    }
+
+    /* number of individual paths */
+    for (count=1, i=0; default_path[i]; ++i) {
+	if (default_path[i] == PAMC_SYSTEM_AGENT_SEPARATOR) {
+	    ++count;
+	}
+    }
+
+    pch->agent_paths = calloc(count+1, sizeof(char *));
+    if (pch->agent_paths == NULL) {
+	D(("no memory for path list"));
+	goto drop_pch;
+    }
+
+    this = last = i = 0;
+    while ( default_path[i] || (i != last) ) {
+	if ( default_path[i] == PAMC_SYSTEM_AGENT_SEPARATOR
+	     || !default_path[i] ) {
+	    int length;
+
+	    pch->agent_paths[this] = malloc(length = 1+i-last);
+
+	    if (pch->agent_paths[this] == NULL) {
+		D(("no memory for next path"));
+		goto drop_list;
+	    }
+
+	    memcpy(pch->agent_paths[this], default_path + last, i-last);
+	    pch->agent_paths[this][i-last] = '\0';
+	    if (length > pch->max_path) {
+		pch->max_path = length;
+	    }
+
+	    if (++this == count) {
+		break;
+	    }
+
+	    last = ++i;
+	} else {
+	    ++i;
+	}
+    }
+
+    return pch;
+
+drop_list:
+    __pamc_delete_path_list(pch);
+
+drop_pch:
+    free(pch);
+
+    return NULL;
+}
+
+/*
+ * shutdown each of the loaded agents and
+ */
+
+static int __pamc_shutdown_agents(pamc_handle_t pch)
+{
+    int retval = PAM_BPC_TRUE;
+
+    D(("called"));
+
+    while (pch->chain) {
+	pid_t pid;
+	int status;
+	pamc_agent_t *this;
+
+	this = pch->chain;
+	D(("cleaning up agent %p", this));
+	pch->chain = pch->chain->next;
+	this->next = NULL;
+	D(("cleaning up agent: %s", this->id));
+
+	/* close off contact with agent and wait for it to shutdown */
+
+	close(this->writer);
+	this->writer = -1;
+	close(this->reader);
+	this->reader = -1;
+
+	pid = waitpid(this->pid, &status, 0);
+	if (pid == this->pid) {
+
+	    D(("is exit:%d, exit val:%d",
+	       WIFEXITED(status), WEXITSTATUS(status)));
+
+	    if (!(WIFEXITED(status) && (WEXITSTATUS(status) == 0))) {
+		retval = PAM_BPC_FALSE;
+	    }
+	} else {
+	    D(("problem shutting down agent (%s): pid(%d) != waitpid(%d)!?",
+	       this->id, this->pid, pid));
+	    retval = PAM_BPC_FALSE;
+	}
+	pid = this->pid = 0;
+
+	memset(this->id, 0, this->id_length);
+	free(this->id);
+	this->id = NULL;
+	this->id_length = 0;
+
+	free(this);
+	this = NULL;
+    }
+
+    return retval;
+}
+
+/*
+ * close the pamc library
+ */
+
+int pamc_end(pamc_handle_t *pch_p)
+{
+    int retval;
+
+    if (pch_p == NULL) {
+	D(("called with no pch_p"));
+	return PAM_BPC_FALSE;
+    }
+
+    if (*pch_p == NULL) {
+	D(("called with no *pch_p"));
+	return PAM_BPC_FALSE;
+    }
+
+    D(("removing path_list"));
+    __pamc_delete_path_list(*pch_p);
+
+    D(("shutting down agents"));
+    retval = __pamc_shutdown_agents(*pch_p);
+
+    D(("freeing *pch_p"));
+    free(*pch_p);
+    *pch_p = NULL;
+
+    return retval;
+}
diff --git a/libpamc/pamc_converse.c b/libpamc/pamc_converse.c
new file mode 100644
index 0000000..f8f60ed
--- /dev/null
+++ b/libpamc/pamc_converse.c
@@ -0,0 +1,211 @@
+/*
+ * $Id$
+ *
+ * Copyright (c) Andrew G. Morgan <morgan@ftp.kernel.org>
+ *
+ * pamc_converse
+ */
+
+#include "libpamc.h"
+
+/*
+ * select agent
+ */
+
+static int __pamc_select_agent(pamc_handle_t pch, char *agent_id)
+{
+    pamc_agent_t *agent;
+
+    for (agent = pch->chain; agent; agent = agent->next) {
+	if (!strcmp(agent->id, agent_id)) {
+	    pch->current = agent;
+	    return PAM_BPC_TRUE;
+	}
+    }
+
+    D(("failed to locate agent"));
+    pch->current = NULL;
+    return PAM_BPC_FALSE;
+}
+
+/*
+ * pass a binary prompt to the active agent and wait for a reply prompt
+ */
+
+int pamc_converse(pamc_handle_t pch, pamc_bp_t *prompt_p)
+{
+    uint32_t size, offset=0;
+    uint8_t control, raw[PAM_BP_MIN_SIZE];
+
+    D(("called"));
+
+    if (pch == NULL) {
+	D(("null pch"));
+	goto pamc_converse_failure;
+    }
+
+    if (prompt_p == NULL) {
+	D(("null prompt_p"));
+	goto pamc_converse_failure;
+    }
+
+    if (*prompt_p == NULL) {
+	D(("null *prompt_p"));
+	goto pamc_converse_failure;
+    }
+
+    /* from here on, failures are interoperability problems.. */
+
+    size = PAM_BP_SIZE(*prompt_p);
+    if (size < PAM_BP_MIN_SIZE) {
+	D(("problem with size being too short (%u)", size));
+	goto pamc_unknown_prompt;
+    }
+
+    if (PAM_BPC_FOR_CLIENT(*prompt_p) != PAM_BPC_TRUE) {
+	D(("*prompt_p is not legal for the client to use"));
+	goto pamc_unknown_prompt;
+    }
+
+    /* do we need to select the agent? */
+    if ((*prompt_p)->control == PAM_BPC_SELECT) {
+	char *rawh;
+	size_t i;
+	int retval;
+
+	D(("selecting a specified agent"));
+
+	rawh = (char *) *prompt_p;
+	for (i = PAM_BP_MIN_SIZE; i<size; ++i) {
+	    if (rawh[i] == '/') {
+		break;
+	    }
+	}
+
+	if ( (i >= size)
+	     || !__pamc_valid_agent_id(i-PAM_BP_MIN_SIZE,
+				       rawh + PAM_BP_MIN_SIZE) ) {
+	    goto pamc_unknown_prompt;
+	}
+
+	rawh[i] = '\0';
+	retval = pamc_load(pch, PAM_BP_MIN_SIZE + rawh);
+	if (retval == PAM_BPC_TRUE) {
+	    retval = __pamc_select_agent(pch, PAM_BP_MIN_SIZE + rawh);
+	}
+	rawh[i] = '/';
+
+	if (retval != PAM_BPC_TRUE) {
+	    goto pamc_unknown_prompt;
+	}
+
+	D(("agent is loaded"));
+    }
+
+    if (pch->current == NULL) {
+	D(("unable to address agent"));
+	goto pamc_unknown_prompt;
+    }
+
+    /* pump all of the prompt into the agent */
+    do {
+	int rval = write(pch->current->writer,
+			 offset + (const uint8_t *) (*prompt_p),
+			 size - offset);
+	if (rval == -1) {
+	    switch (errno) {
+	    case EINTR:
+		break;
+	    default:
+		D(("problem writing to agent: %m"));
+		goto pamc_unknown_prompt;
+	    }
+	} else {
+	    offset += rval;
+	}
+    } while (offset < size);
+
+    D(("whole prompt sent to agent"));
+
+    /* read size and control for response prompt */
+
+    offset = 0;
+    memset(raw, 0, sizeof(raw));
+    do {
+	int rval;
+
+	rval = read(pch->current->reader, raw + offset,
+		    PAM_BP_MIN_SIZE - offset);
+
+	if (rval == -1) {
+	    switch (errno) {
+	    case EINTR:
+		break;
+	    default:
+		D(("problem reading from agent: %m"));
+		goto pamc_unknown_prompt;
+	    }
+	} else if (rval) {
+	    offset += rval;
+	} else {
+	    D(("agent has closed its output pipe - nothing more to read"));
+	    goto pamc_converse_failure;
+	}
+    } while (offset < PAM_BP_MIN_SIZE);
+
+    /* construct the whole reply prompt */
+
+    size = PAM_BP_SIZE(raw);
+    control = PAM_BP_RCONTROL(raw);
+    memset(raw, 0, sizeof(raw));
+
+    D(("agent replied with prompt of size %d and control %u",
+       size, control));
+
+    PAM_BP_RENEW(prompt_p, control, size - PAM_BP_MIN_SIZE);
+    if (*prompt_p == NULL) {
+	D(("problem making a new prompt for reply"));
+	goto pamc_unknown_prompt;
+    }
+
+    /* read the rest of the reply prompt -- note offset has the correct
+       value from the previous loop */
+
+    while (offset < size) {
+	int rval = read(pch->current->reader, offset + (uint8_t *) *prompt_p,
+			size-offset);
+
+	if (rval == -1) {
+	    switch (errno) {
+	    case EINTR:
+		break;
+	    default:
+		D(("problem reading from agent: %m"));
+		goto pamc_unknown_prompt;
+	    }
+	} else if (rval) {
+	    offset += rval;
+	} else {
+	    D(("problem reading prompt (%d) with %d to go",
+	       size, size-offset));
+	    goto pamc_converse_failure;
+	}
+    }
+
+    D(("returning success"));
+
+    return PAM_BPC_TRUE;
+
+pamc_converse_failure:
+
+    D(("conversation failure"));
+    PAM_BP_RENEW(prompt_p, 0, 0);
+    return PAM_BPC_FALSE;
+
+pamc_unknown_prompt:
+
+    /* the server is trying something that the client does not support */
+    D(("unknown prompt"));
+    PAM_BP_RENEW(prompt_p, PAM_BPC_FAIL, 0);
+    return PAM_BPC_TRUE;
+}
diff --git a/libpamc/pamc_load.c b/libpamc/pamc_load.c
new file mode 100644
index 0000000..24a65df
--- /dev/null
+++ b/libpamc/pamc_load.c
@@ -0,0 +1,477 @@
+/*
+ * $Id$
+ *
+ * Copyright (c) 1999 Andrew G. Morgan <morgan@ftp.kernel.org>
+ *
+ * pamc_load
+ */
+
+#include "libpamc.h"
+
+static int __pamc_exec_agent(pamc_handle_t pch, pamc_agent_t *agent)
+{
+    char *full_path;
+    int found_agent, length, reset_length, to_agent[2], from_agent[2];
+    int return_code = PAM_BPC_FAIL;
+
+    if (agent->id[agent->id_length] != '\0') {
+	PAM_BP_ASSERT("libpamc: internal error agent_id not terminated");
+    }
+
+    for (length=0; (length < agent->id_length); ++length) {
+	switch (agent->id[length]) {
+	case '/':
+	    D(("ill formed agent id"));
+	    return PAM_BPC_FAIL;
+	}
+    }
+
+    /* enough memory for any path + this agent */
+    reset_length = 3 + pch->max_path + agent->id_length;
+    D(("reset_length = %d (3+%d+%d)",
+       reset_length, pch->max_path, agent->id_length));
+    full_path = malloc(reset_length);
+    if (full_path == NULL) {
+	D(("no memory for agent path"));
+	return PAM_BPC_FAIL;
+    }
+
+    found_agent = 0;
+    for (length=0; pch->agent_paths[length]; ++length) {
+	struct stat buf;
+
+	D(("path: [%s]", pch->agent_paths[length]));
+	D(("agent id: [%s]", agent->id));
+
+	sprintf(full_path, "%s/%s", pch->agent_paths[length], agent->id);
+
+	D(("looking for agent here: [%s]\n", full_path));
+	if (stat(full_path, &buf) == 0) {
+	    D(("file existis"));
+	    found_agent = 1;
+	    break;
+	}
+    }
+
+    if (! found_agent) {
+	D(("no agent was found"));
+	goto free_and_return;
+    }
+
+    if (pipe(to_agent)) {
+	D(("failed to open pipe to agent"));
+	goto free_and_return;
+    }
+
+    if (pipe(from_agent)) {
+	D(("failed to open pipe from agent"));
+	goto close_the_agent;
+    }
+
+    agent->pid = fork();
+    if (agent->pid == -1) {
+
+	D(("failed to fork for agent"));
+	goto close_both_pipes;
+
+    } else if (agent->pid == 0) {
+
+	int i;
+
+	dup2(from_agent[1], STDOUT_FILENO);
+	dup2(to_agent[0], STDIN_FILENO);
+
+	/* we close all of the files that have filedescriptors lower
+	   and equal to twice the highest we have seen, The idea is
+	   that we don't want to leak filedescriptors to agents from a
+	   privileged client application.
+
+	   XXX - this is a heuristic at this point. There is a growing
+	    need for an extra 'set param' libpamc function, that could
+	    be used to supply info like the highest fd to close etc..
+	*/
+
+	if (from_agent[1] > pch->highest_fd_to_close) {
+	    pch->highest_fd_to_close = 2*from_agent[1];
+	}
+
+	for (i=0; i <= pch->highest_fd_to_close; ++i) {
+	    switch (i) {
+	    case STDOUT_FILENO:
+	    case STDERR_FILENO:
+	    case STDIN_FILENO:
+		/* only these three remain open */
+		break;
+	    default:
+		(void) close(i); /* don't care if its not open */
+	    }
+	}
+
+	/* we make no attempt to drop other privileges - this library
+	   has no idea how that would be done in the general case. It
+	   is up to the client application (when calling
+	   pamc_converse) to make sure no privilege will leak into an
+	   (untrusted) agent. */
+
+	/* we propagate no environment - future versions of this
+           library may have the ability to audit all agent
+           transactions. */
+
+	D(("exec'ing agent %s", full_path));
+	execle(full_path, "pam-agent", NULL, NULL);
+
+	D(("exec failed"));
+	_exit(1);
+
+    }
+
+    close(to_agent[0]);
+    close(from_agent[1]);
+
+    agent->writer = to_agent[1];
+    agent->reader = from_agent[0];
+
+    return_code = PAM_BPC_TRUE;
+    goto free_and_return;
+
+close_both_pipes:
+    close(from_agent[0]);
+    close(from_agent[1]);
+
+close_the_agent:
+    close(to_agent[0]);
+    close(to_agent[1]);
+
+free_and_return:
+    memset(full_path, 0, reset_length);
+    free(full_path);
+
+    D(("returning %d", return_code));
+
+    return return_code;
+}
+
+/*
+ * has the named agent been loaded?
+ */
+
+static int __pamc_agent_is_enabled(pamc_handle_t pch, const char *agent_id)
+{
+    pamc_agent_t *agent;
+
+    for (agent = pch->chain; agent; agent = agent->next) {
+	if (!strcmp(agent->id, agent_id)) {
+	    D(("agent already loaded"));
+	    return PAM_BPC_TRUE;
+	}
+    }
+
+    D(("agent is not loaded"));
+    return PAM_BPC_FALSE;
+}
+
+/*
+ * has the named agent been disabled?
+ */
+
+static int __pamc_agent_is_disabled(pamc_handle_t pch, const char *agent_id)
+{
+    pamc_blocked_t *blocked;
+
+    for (blocked=pch->blocked_agents; blocked; blocked = blocked->next) {
+	if (!strcmp(agent_id, blocked->id)) {
+	    D(("agent is disabled"));
+	    return PAM_BPC_TRUE;
+	}
+    }
+
+    D(("agent is not disabled"));
+    return PAM_BPC_FALSE;
+}
+
+/*
+ * disable an agent
+ */
+
+int pamc_disable(pamc_handle_t pch, const char *agent_id)
+{
+    pamc_blocked_t *block;
+
+    if (pch == NULL) {
+	D(("pch is NULL"));
+	return PAM_BPC_FALSE;
+    }
+
+    if (agent_id == NULL) {
+	D(("agent_id is NULL"));
+	return PAM_BPC_FALSE;
+    }
+
+    if (__pamc_agent_is_enabled(pch, agent_id) != PAM_BPC_FALSE) {
+	D(("agent is already loaded"));
+	return PAM_BPC_FALSE;
+    }
+
+    if (__pamc_agent_is_disabled(pch, agent_id) != PAM_BPC_FALSE) {
+	D(("agent is already disabled"));
+	return PAM_BPC_TRUE;
+    }
+
+    block = calloc(1, sizeof(pamc_blocked_t));
+    if (block == NULL) {
+	D(("no memory for new blocking structure"));
+	return PAM_BPC_FALSE;
+    }
+
+    block->id =	malloc(1 + strlen(agent_id));
+    if (block->id == NULL) {
+	D(("no memory for agent id"));
+	free(block);
+	return PAM_BPC_FALSE;
+    }
+
+    strcpy(block->id, agent_id);
+    block->next = pch->blocked_agents;
+    pch->blocked_agents = block;
+
+    return PAM_BPC_TRUE;
+}
+
+/*
+ * force the loading of a particular agent
+ */
+
+int pamc_load(pamc_handle_t pch, const char *agent_id)
+{
+    pamc_agent_t *agent;
+    int length;
+
+    /* santity checking */
+
+    if (pch == NULL) {
+	D(("pch is NULL"));
+	return PAM_BPC_FALSE;
+    }
+
+    if (agent_id == NULL) {
+	D(("agent_id is NULL"));
+	return PAM_BPC_FALSE;
+    }
+
+    if (__pamc_agent_is_disabled(pch, agent_id) != PAM_BPC_FALSE) {
+	D(("sorry agent is disabled"));
+	return PAM_BPC_FALSE;
+    }
+
+    length = strlen(agent_id);
+
+    /* scan list to see if agent is loaded */
+
+    if (__pamc_agent_is_enabled(pch, agent_id) == PAM_BPC_TRUE) {
+	D(("no need to load an already loaded agent (%s)", agent_id));
+	return PAM_BPC_TRUE;
+    }
+
+    /* not in the list, so we need to load it and add it to the head
+       of the chain */
+
+    agent = calloc(1, sizeof(pamc_agent_t));
+    if (agent == NULL) {
+	D(("no memory for new agent"));
+	return PAM_BPC_FALSE;
+    }
+    agent->id = calloc(1, 1+length);
+    if (agent->id == NULL) {
+	D(("no memory for new agent's id"));
+	goto fail_free_agent;
+    }
+    memcpy(agent->id, agent_id, length);
+    agent->id[length] = '\0';
+    agent->id_length = length;
+
+    if (__pamc_exec_agent(pch, agent) != PAM_BPC_TRUE) {
+	D(("unable to exec agent"));
+	goto fail_free_agent_id;
+    }
+
+    agent->next = pch->chain;
+    pch->chain = agent;
+
+    return PAM_BPC_TRUE;
+
+fail_free_agent_id:
+
+    memset(agent->id, 0, agent->id_length);
+    free(agent->id);
+
+    memset(agent, 0, sizeof(*agent));
+
+fail_free_agent:
+
+    free(agent);
+    return PAM_BPC_FALSE;
+}
+
+/*
+ * what's a valid agent name?
+ */
+
+int __pamc_valid_agent_id(int id_length, const char *id)
+{
+    int post, i;
+
+    for (i=post=0 ; i < id_length; ++i) {
+	int ch = id[i++];
+
+	if (isalpha(ch) || isdigit(ch) || (ch == '_')) {
+	    continue;
+	} else if (post && (ch == '.')) {
+	    continue;
+	} else if ((i > 1) && (!post) && (ch == '@')) {
+	    post = 1;
+	} else {
+	    D(("id=%s contains '%c' which is illegal", id, ch));
+	    return 0;
+	}
+    }
+
+    if (!i) {
+	D(("length of id is 0"));
+	return 0;
+    } else {
+	return 1;                       /* id is valid */
+    }
+}
+
+/*
+ * building a tree of available agent names
+ */
+
+static pamc_id_node_t *__pamc_add_node(pamc_id_node_t *root, const char *id,
+				       int *counter)
+{
+    if (root) {
+
+	int cmp;
+
+	if ((cmp = strcmp(id, root->agent_id))) {
+	    if (cmp > 0) {
+		root->right = __pamc_add_node(root->right, id,
+					      &(root->child_count));
+	    } else {
+		root->left = __pamc_add_node(root->left, id,
+					     &(root->child_count));
+	    }
+	}
+
+	return root;
+
+    } else {
+
+	pamc_id_node_t *node = calloc(1, sizeof(pamc_id_node_t));
+
+	if (node) {
+	    node->agent_id = malloc(1+strlen(id));
+	    if (node->agent_id) {
+		strcpy(node->agent_id, id);
+	    } else {
+		free(node);
+		node = NULL;
+	    }
+	}
+
+	(*counter)++;
+	return node;
+    }
+}
+
+/*
+ * drop all of the tree and any remaining ids
+ */
+
+static pamc_id_node_t *__pamc_liberate_nodes(pamc_id_node_t *tree)
+{
+    if (tree) {
+	if (tree->agent_id) {
+	    free(tree->agent_id);
+	    tree->agent_id = NULL;
+	}
+
+	tree->left = __pamc_liberate_nodes(tree->left);
+	tree->right = __pamc_liberate_nodes(tree->right);
+
+	tree->child_count = 0;
+	free(tree);
+    }
+
+    return NULL;
+}
+
+/*
+ * fill a list with the contents of the tree (in ascii order)
+ */
+
+static void __pamc_fill_list_from_tree(pamc_id_node_t *tree, char **agent_list,
+				       int *counter)
+{
+    if (tree) {
+	__pamc_fill_list_from_tree(tree->left, agent_list, counter);
+	agent_list[(*counter)++] = tree->agent_id;
+	tree->agent_id = NULL;
+	__pamc_fill_list_from_tree(tree->right, agent_list, counter);
+    }
+}
+
+/*
+ * get a list of the available agents
+ */
+
+char **pamc_list_agents(pamc_handle_t pch)
+{
+    int i, total_agent_count=0;
+    pamc_id_node_t *tree = NULL;
+    char **agent_list;
+
+    /* loop over agent paths */
+
+    for (i=0; pch->agent_paths[i]; ++i) {
+	DIR *dir;
+
+	dir = opendir(pch->agent_paths[i]);
+	if (dir) {
+	    struct dirent *item;
+
+	    while ((item = readdir(dir))) {
+
+		/* this is a cheat on recognizing agent_ids */
+		if (!__pamc_valid_agent_id(strlen(item->d_name),
+					   item->d_name)) {
+		    continue;
+		}
+
+		tree = __pamc_add_node(tree, item->d_name, &total_agent_count);
+	    }
+
+	    closedir(dir);
+	}
+    }
+
+    /* now, we build a list of ids */
+    D(("total of %d available agents\n", total_agent_count));
+
+    agent_list = calloc(total_agent_count+1, sizeof(char *));
+    if (agent_list) {
+	int counter=0;
+
+	__pamc_fill_list_from_tree(tree, agent_list, &counter);
+	if (counter != total_agent_count) {
+	    PAM_BP_ASSERT("libpamc: internal error transcribing tree");
+	}
+    } else {
+	D(("no memory for agent list"));
+    }
+
+    __pamc_liberate_nodes(tree);
+
+    return agent_list;
+}
diff --git a/libpamc/test/Makefile.am b/libpamc/test/Makefile.am
new file mode 100644
index 0000000..fc0cac4
--- /dev/null
+++ b/libpamc/test/Makefile.am
@@ -0,0 +1,11 @@
+#
+# Copyright (c) 2005 Thorsten Kukuk <kukuk@suse.de>
+#
+
+AUTOMAKE_OPTIONS = 1.6 gnits
+
+CLEANFILES = *~ */*~
+
+EXTRA_DIST = agents/secret@here modules/Makefile modules/pam_secret.c \
+	regress/Makefile regress/run_test.sh regress/test.libpamc.c \
+	regress/test.secret@here
diff --git a/libpamc/test/Makefile.in b/libpamc/test/Makefile.in
new file mode 100644
index 0000000..e2f360b
--- /dev/null
+++ b/libpamc/test/Makefile.in
@@ -0,0 +1,526 @@
+# Makefile.in generated by automake 1.16.3 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
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+SET_MAKE = @SET_MAKE@
+SHELL = @SHELL@
+STRINGPARAM_HMAC = @STRINGPARAM_HMAC@
+STRINGPARAM_VENDORDIR = @STRINGPARAM_VENDORDIR@
+STRIP = @STRIP@
+TIRPC_CFLAGS = @TIRPC_CFLAGS@
+TIRPC_LIBS = @TIRPC_LIBS@
+USE_NLS = @USE_NLS@
+VERSION = @VERSION@
+WARN_CFLAGS = @WARN_CFLAGS@
+XGETTEXT = @XGETTEXT@
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+host_alias = @host_alias@
+host_cpu = @host_cpu@
+host_os = @host_os@
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+localstatedir = @localstatedir@
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+top_srcdir = @top_srcdir@
+AUTOMAKE_OPTIONS = 1.6 gnits
+CLEANFILES = *~ */*~
+EXTRA_DIST = agents/secret@here modules/Makefile modules/pam_secret.c \
+	regress/Makefile regress/run_test.sh regress/test.libpamc.c \
+	regress/test.secret@here
+
+all: all-am
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+	      exit 1;; \
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+	done; \
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+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --gnits libpamc/test/Makefile
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+	  *config.status*) \
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+
+distdir: $(BUILT_SOURCES)
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+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/libpamc/test/agents/secret@here b/libpamc/test/agents/secret@here
new file mode 100755
index 0000000..8d82c01
--- /dev/null
+++ b/libpamc/test/agents/secret@here
@@ -0,0 +1,307 @@
+#!/usr/bin/perl
+#
+# This is a simple example PAM authentication agent, it implements a
+# simple shared secret authentication scheme. The PAM module pam_secret.so
+# is its counter part. Both the agent and the remote server are able to
+# authenticate one another, but the server is given the opportunity to
+# ignore a failed authentication.
+#
+
+$^W = 1;
+use strict;
+use IPC::Open2;
+$| = 1;
+
+# display extra information to STDERR
+my $debug = 0;
+if (scalar @ARGV) {
+    $debug = 1;
+}
+
+# Globals
+
+my %state;
+my $default_key;
+
+my $next_key = $$;
+
+# loop over binary prompts
+for (;;) {
+    my ($control, $data) = ReadBinaryPrompt();
+    my ($reply_control, $reply_data);
+
+    if ($control == 0) {
+	if ($debug) {
+	    print STDERR "agent: no packet to read\n";
+	}
+	last;
+    } elsif ($control == 0x02) {
+	($reply_control, $reply_data) = HandleAgentSelection($data);
+    } elsif ($control == 0x01) {
+	($reply_control, $reply_data) = HandleContinuation($data);
+    } else {
+	if ($debug) {
+	    print STDERR
+		"agent: unrecognized packet $control {$data} to read\n";
+	}
+	($reply_control, $reply_data) = (0x04, "");
+    }
+
+    WriteBinaryPrompt($reply_control, $reply_data);
+}
+
+# Only willing to exit well if we've completed our authentication exchange
+
+if (scalar keys %state) {
+    if ($debug) {
+	print STDERR "The following sessions are still active:\n  ";
+	print STDERR join ', ', keys %state;
+	print STDERR "\n";
+    }
+    exit 1;
+} else {
+    exit 0;
+}
+
+sub HandleAgentSelection ($) {
+    my ($data) = @_;
+
+    unless ( $data =~ /^([a-zA-Z0-9_]+\@?[a-zA-Z0-9_.]*)\/(.*)$/ ) {
+	return (0x04, "");
+    }
+
+    my ($agent_name, $payload) = ($1, $2);
+    if ($debug) {
+	print STDERR "agent: ". "agent=$agent_name, payload=$payload\n";
+    }
+
+    # this agent has a defined name
+    if ($agent_name ne "secret\@here") {
+	if ($debug) {
+	    print STDERR "bad agent name: [$agent_name]\n";
+	}
+	return (0x04, "");
+    }
+
+    # the selection request is acompanied with a hexadecimal cookie
+    my @tokens = split '\|', $payload;
+
+    unless ((scalar @tokens) == 2) {
+	if ($debug) {
+	    print STDERR "bad payload\n";
+	}
+	return (0x04, "");
+    }
+
+    unless ($tokens[1] =~ /^[a-z0-9]+$/) {
+	if ($debug) {
+	    print STDERR "bad server cookie\n";
+	}
+	return (0x04, "");
+    }
+
+    my $shared_secret = IdentifyLocalSecret($tokens[0]);
+
+    unless (defined $shared_secret) {
+	# make a secret up
+	if ($debug) {
+	    print STDERR "agent: cannot authenticate user\n";
+	}
+	$shared_secret = GetRandom();
+    }
+
+    my $local_cookie = GetRandom();
+    $default_key = $next_key++;
+
+    $state{$default_key} = $local_cookie ."|". $tokens[1] ."|". $shared_secret;
+
+    if ($debug) {
+	print STDERR "agent: \$state{$default_key} = $state{$default_key}\n";
+    }
+
+    return (0x01, $default_key ."|". $local_cookie);
+}
+
+sub HandleContinuation ($) {
+    my ($data) = @_;
+
+    my ($key, $server_digest) = split '\|', $data;
+
+    unless (defined $state{$key}) {
+	# retries and out of sequence prompts are not permitted
+	return (0x04, "");
+    }
+
+    my $expected_digest = CreateDigest($state{$key});
+    my ($local_cookie, $remote_cookie, $shared_secret)
+	= split '\|', $state{$key};
+    delete $state{$key};
+
+    unless ($expected_digest eq $server_digest) {
+	if ($debug) {
+	    print STDERR "agent: don't trust server - faking reply\n";
+	    print STDERR "agent: got      ($server_digest)\n";
+	    print STDERR "agent: expected ($expected_digest)\n";
+	}
+
+	## FIXME: Agent should exchange a prompt with the client warning
+	## that the server is faking us out.
+
+	return (0x03, CreateDigest($expected_digest . $data . GetRandom()));
+    }
+
+    if ($debug) {
+	print STDERR "agent: server appears to know the secret\n";
+    }
+
+    my $session_authenticated_ticket =
+	CreateDigest($remote_cookie."|".$shared_secret."|".$local_cookie);
+
+    # FIXME: Agent should set a derived session key environment
+    # variable (available for the client (and its children) to sign
+    # future data exchanges.
+
+    if ($debug) {
+	print STDERR "agent: should putenv("
+	    ."\"AUTH_SESSION_TICKET=$session_authenticated_ticket\")\n";
+    }
+
+    # return agent's authenticating digest
+    return (0x03, CreateDigest($shared_secret."|".$remote_cookie
+			       ."|".$local_cookie));
+}
+
+sub ReadBinaryPrompt {
+    my $buffer = "     ";
+    my $count = read(STDIN, $buffer, 5);
+    if ($count == 0) {
+	# no more packets to read
+	return (0, "");
+    }
+
+    if ($count != 5) {
+	# broken packet header
+	return (-1, "");
+    }
+
+    my ($length, $control) = unpack("N C", $buffer);
+    if ($length < 5) {
+	# broken packet length
+	return (-1, "");
+    }
+
+    my $data = "";
+    $length -= 5;
+    while ($count = read(STDIN, $buffer, $length)) {
+	$data .= $buffer;
+	if ($count != $length) {
+	    $length -= $count;
+	    next;
+	}
+
+	if ($debug) {
+	    print STDERR "agent: ". "data is [$data]\n";
+	}
+
+	return ($control, $data);
+    }
+
+    # broken packet data
+    return (-1, "");
+}
+
+sub WriteBinaryPrompt ($$) {
+    my ($control, $data) = @_;
+
+    my $length = 5 + length($data);
+    if ($debug) {
+	printf STDERR "agent: ". "{%d|0x%.2x|%s}\n", $length, $control, $data;
+    }
+    my $bp = pack("N C a*", $length, $control, $data);
+    print STDOUT $bp;
+    if ($debug) {
+	printf STDERR "agent: ". "agent has replied\n";
+    }
+}
+
+##
+## Here is where we parse the simple secret file
+## The format of this file is a list of lines of the following form:
+##
+## user@client0.host.name  secret_string1
+## user@client1.host.name  secret_string2
+## user@client2.host.name  secret_string3
+##
+
+sub IdentifyLocalSecret ($) {
+    my ($identifier) = @_;
+    my $secret;
+
+    if (open SECRETS, "< ". (getpwuid($<))[7] ."/.secret\@here") {
+	my $line;
+	while (defined ($line = <SECRETS>)) {
+	    my ($id, $sec) = split /[\s]+/, $line;
+	    if ((defined $id) && ($id eq $identifier)) {
+		$secret = $sec;
+		last;
+	    }
+	}
+	close SECRETS;
+    }
+
+    return $secret;
+}
+
+## Here is where we generate a message digest
+
+sub CreateDigest ($) {
+    my ($data) = @_;
+
+    my $pid = open2(\*MD5out, \*MD5in, "/usr/bin/md5sum -")
+	or die "you'll need /usr/bin/md5sum installed";
+
+    my $oldfd = select MD5in; $|=1; select $oldfd;
+    if ($debug) {
+	print STDERR "agent: ". "telling md5: <$data>\n";
+    }
+    print MD5in "$data";
+    close MD5in;
+    my $reply = <MD5out>;
+    ($reply) = split /\s/, $reply;
+    if ($debug) {
+	print STDERR "agent: ". "md5 said: <$reply>\n";
+    }
+    close MD5out;
+
+    return $reply;
+}
+
+## get a random number
+
+sub GetRandom {
+
+    if ( -r "/dev/urandom" ) {
+	open RANDOM, "< /dev/urandom" or die "crazy";
+
+	my $i;
+	my $reply = "";
+
+	for ($i=0; $i<4; ++$i) {
+	    my $buffer = "    ";
+	    while (read(RANDOM, $buffer, 4) != 4) {
+		;
+	    }
+	    $reply .= sprintf "%.8x", unpack("N", $buffer);
+	    if ($debug) {
+		print STDERR "growing reply: [$reply]\n";
+	    }
+	}
+	close RANDOM;
+
+	return $reply;
+    } else {
+	print STDERR "agent: ". "[got linux?]\n";
+	return "%.8x%.8x%.8x%.8x", time, time, time, time;
+    }
+
+}
diff --git a/libpamc/test/modules/Makefile b/libpamc/test/modules/Makefile
new file mode 100644
index 0000000..4806546
--- /dev/null
+++ b/libpamc/test/modules/Makefile
@@ -0,0 +1,9 @@
+CFLAGS = -g -fPIC -I"../../include"
+
+pam_secret.so: pam_secret.o
+	ld -x --shared -o pam_secret.so pam_secret.o -lc
+
+.o.c:
+
+clean:
+	rm -f *.so *.o
diff --git a/libpamc/test/modules/pam_secret.c b/libpamc/test/modules/pam_secret.c
new file mode 100644
index 0000000..f1c74c6
--- /dev/null
+++ b/libpamc/test/modules/pam_secret.c
@@ -0,0 +1,669 @@
+/*
+ * $Id$
+ *
+ * Copyright (c) 1999 Andrew G. Morgan <morgan@linux.kernel.org>
+ */
+
+/*
+ * WARNING: AS WRITTEN THIS CODE IS NOT SECURE. THE MD5 IMPLEMENTATION
+ *          NEEDS TO BE INTEGRATED MORE NATIVELY.
+ */
+
+#include <fcntl.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <security/pam_modules.h>
+#include <security/pam_client.h>
+#include <security/_pam_macros.h>
+
+/*
+ * This is a sample module that demonstrates the use of binary prompts
+ * and how they can be used to implement sophisticated authentication
+ * schemes.
+ */
+
+struct ps_state_s {
+    int retval;        /* last retval returned by the authentication fn */
+    int state;         /* what state the module was in when it
+			  returned incomplete */
+
+    char *username;    /* the name of the local user */
+
+    char server_cookie[33]; /* storage for 32 bytes of server cookie */
+    char client_cookie[33]; /* storage for 32 bytes of client cookie */
+
+    char *secret_data; /* pointer to <NUL> terminated secret_data */
+    int invalid_secret;  /* indication of whether the secret is valid */
+
+    pamc_bp_t current_prompt;    /* place to store the current prompt */
+    pamc_bp_t current_reply;     /* place to receive the reply prompt */
+};
+
+#define PS_STATE_ID   "PAM_SECRET__STATE"
+#define PS_AGENT_ID   "secret@here"
+#define PS_STATE_DEAD          0
+#define PS_STATE_INIT          1
+#define PS_STATE_PROMPT1       2
+#define PS_STATE_PROMPT2       3
+
+#define MAX_LEN_HOSTNAME       512
+#define MAX_FILE_LINE_LEN      1024
+
+/*
+ * Routine for generating 16*8 bits of random data represented in ASCII hex
+ */
+
+static int generate_cookie(unsigned char *buffer_33)
+{
+    static const char hexarray[] = "0123456789abcdef";
+    int i, fd;
+
+    /* fill buffer_33 with 32 hex characters (lower case) + '\0' */
+    fd = open("/dev/urandom", O_RDONLY);
+    if (fd < 0) {
+	D(("failed to open /dev/urandom"));
+	return 0;
+    }
+    read(fd, buffer_33 + 16, 16);
+    close(fd);
+
+    /* expand top 16 bytes into 32 nibbles */
+    for (i=0; i<16; ++i) {
+	buffer_33[2*i  ] = hexarray[(buffer_33[16+i] & 0xf0)>>4];
+	buffer_33[2*i+1] = hexarray[(buffer_33[16+i] & 0x0f)];
+    }
+
+    buffer_33[32] = '\0';
+
+    return 1;
+}
+
+/*
+ * XXX - This is a hack, and is fundamentally insecure. Its subject to
+ * all sorts of attacks not to mention the fact that all our secrets
+ * will be displayed on the command line for someone doing 'ps' to
+ * see. This is just for programming convenience in this instance, it
+ * needs to be replaced with the md5 code. Although I am loath to
+ * add yet another instance of md5 code to the Linux-PAM source code.
+ * [Need to think of a cleaner way to do this for the distribution as
+ * a whole...]
+ */
+
+#define COMMAND_FORMAT "/bin/echo -n '%s|%s|%s'|/usr/bin/md5sum -"
+
+int create_digest(const char *d1, const char *d2, const char *d3,
+		  char *buffer_33)
+{
+    int length;
+    char *buffer;
+    FILE *pipe;
+
+    length = strlen(d1)+strlen(d2)+strlen(d3)+sizeof(COMMAND_FORMAT);
+    buffer = malloc(length);
+    if (buffer == NULL) {
+	D(("out of memory"));
+	return 0;
+    }
+
+    sprintf(buffer, COMMAND_FORMAT, d1,d2,d3);
+
+    D(("executing pipe [%s]", buffer));
+    pipe = popen(buffer, "r");
+    memset(buffer, 0, length);
+    free(buffer);
+
+    if (pipe == NULL) {
+	D(("failed to launch pipe"));
+	return 0;
+    }
+
+    if (fgets(buffer_33, 33, pipe) == NULL) {
+	D(("failed to read digest"));
+	return 0;
+    }
+
+    if (strlen(buffer_33) != 32) {
+	D(("digest was not 32 chars"));
+	return 0;
+    }
+
+    fclose(pipe);
+
+    D(("done [%s]", buffer_33));
+
+    return 1;
+}
+
+/*
+ * method to attempt to instruct the application's conversation function
+ */
+
+static int converse(pam_handle_t *pamh, struct ps_state_s *new)
+{
+    int retval;
+    struct pam_conv *conv;
+
+    D(("called"));
+
+    retval = pam_get_item(pamh, PAM_CONV, (const void **) &conv);
+    if (retval == PAM_SUCCESS) {
+	struct pam_message msg;
+	struct pam_response *single_reply;
+	const struct pam_message *msg_ptr;
+
+	memset(&msg, 0, sizeof(msg));
+	msg.msg_style = PAM_BINARY_PROMPT;
+	msg.msg = (const char *) new->current_prompt;
+	msg_ptr = &msg;
+
+	single_reply = NULL;
+	retval = conv->conv(1, &msg_ptr, &single_reply, conv->appdata_ptr);
+	if (retval == PAM_SUCCESS) {
+	    if ((single_reply == NULL) || (single_reply->resp == NULL)) {
+		retval == PAM_CONV_ERR;
+	    } else {
+		new->current_reply = (pamc_bp_t) single_reply->resp;
+		single_reply->resp = NULL;
+	    }
+	}
+
+	if (single_reply) {
+	    free(single_reply);
+	}
+    }
+
+#ifdef PAM_DEBUG
+    if (retval == PAM_SUCCESS) {
+	D(("reply has length=%d and control=%u",
+	   PAM_BP_LENGTH(new->current_reply),
+	   PAM_BP_CONTROL(new->current_reply)));
+    }
+    D(("returning %s", pam_strerror(pamh, retval)));
+#endif
+
+    return retval;
+}
+
+/*
+ * identify the secret in question
+ */
+
+#define SECRET_FILE_FORMAT "%s/.secret@here"
+
+char *identify_secret(char *identity, const char *user)
+{
+    struct passwd *pwd;
+    char *temp;
+    FILE *secrets;
+    int length_id;
+
+    pwd = getpwnam(user);
+    if ((pwd == NULL) || (pwd->pw_dir == NULL)) {
+	D(("user [%s] is not known", user));
+	return NULL;
+    }
+
+    length_id = strlen(pwd->pw_dir) + sizeof(SECRET_FILE_FORMAT);
+    temp = malloc(length_id);
+    if (temp == NULL) {
+	D(("out of memory"));
+	pwd = NULL;
+	return NULL;
+    }
+
+    sprintf(temp, SECRET_FILE_FORMAT, pwd->pw_dir);
+    pwd = NULL;
+
+    D(("opening key file [%s]", temp));
+    secrets = fopen(temp, "r");
+    memset(temp, 0, length_id);
+
+    if (secrets == NULL) {
+	D(("failed to open key file"));
+	return NULL;
+    }
+
+    length_id = strlen(identity);
+    temp = malloc(MAX_FILE_LINE_LEN);
+
+    for (;;) {
+	char *secret = NULL;
+
+	if (fgets(temp, MAX_FILE_LINE_LEN, secrets) == NULL) {
+	    fclose(secrets);
+	    return NULL;
+	}
+
+	D(("cf[%s][%s]", identity, temp));
+	if (memcmp(temp, identity, length_id)) {
+	    continue;
+	}
+
+	D(("found entry"));
+	fclose(secrets);
+
+	for (secret=temp+length_id; *secret; ++secret) {
+	    if (!(*secret == ' ' || *secret == '\n' || *secret == '\t')) {
+		break;
+	    }
+	}
+
+	memmove(temp, secret, MAX_FILE_LINE_LEN-(secret-(temp+length_id)));
+	secret = temp;
+
+	for (; *secret; ++secret) {
+	    if (*secret == ' ' || *secret == '\n' || *secret == '\t') {
+		break;
+	    }
+	}
+
+	if (*secret) {
+	    *secret = '\0';
+	}
+
+	D(("secret found [%s]", temp));
+
+	return temp;
+    }
+
+    /* NOT REACHED */
+}
+
+/*
+ * function to perform the two message authentication process
+ * (with support for event driven conversation functions)
+ */
+
+static int auth_sequence(pam_handle_t *pamh,
+			 const struct ps_state_s *old, struct ps_state_s *new)
+{
+    const char *rhostname;
+    const char *rusername;
+    int retval;
+
+    retval = pam_get_item(pamh, PAM_RUSER, (const void **) &rusername);
+    if ((retval != PAM_SUCCESS) || (rusername == NULL)) {
+	D(("failed to obtain an rusername"));
+	new->state = PS_STATE_DEAD;
+	return PAM_AUTH_ERR;
+    }
+
+    retval = pam_get_item(pamh, PAM_RHOST, (const void **) &rhostname);
+    if ((retval != PAM_SUCCESS) || (rhostname == NULL)) {
+	D(("failed to identify local hostname: ", pam_strerror(pamh, retval)));
+	new->state = PS_STATE_DEAD;
+	return PAM_AUTH_ERR;
+    }
+
+    D(("switch on new->state=%d [%s@%s]", new->state, rusername, rhostname));
+    switch (new->state) {
+
+    case PS_STATE_INIT:
+    {
+	const char *user = NULL;
+
+	retval = pam_get_user(pamh, &user, NULL);
+
+	if ((retval == PAM_SUCCESS) && (user == NULL)) {
+	    D(("success but no username?"));
+	    new->state = PS_STATE_DEAD;
+	    retval = PAM_USER_UNKNOWN;
+	}
+
+	if (retval != PAM_SUCCESS) {
+	    if (retval == PAM_CONV_AGAIN) {
+		retval = PAM_INCOMPLETE;
+	    } else {
+		new->state = PS_STATE_DEAD;
+	    }
+	    D(("state init failed: %s", pam_strerror(pamh, retval)));
+	    return retval;
+	}
+
+	/* nothing else in this 'case' can be retried */
+
+	new->username = strdup(user);
+	if (new->username == NULL) {
+	    D(("out of memory"));
+	    new->state = PS_STATE_DEAD;
+	    return PAM_BUF_ERR;
+	}
+
+	if (! generate_cookie(new->server_cookie)) {
+	    D(("problem generating server cookie"));
+	    new->state = PS_STATE_DEAD;
+	    return PAM_ABORT;
+	}
+
+	new->current_prompt = NULL;
+	PAM_BP_RENEW(&new->current_prompt, PAM_BPC_SELECT,
+		     sizeof(PS_AGENT_ID) + strlen(rusername) + 1
+		     + strlen(rhostname) + 1 + 32);
+	sprintf(PAM_BP_WDATA(new->current_prompt),
+		PS_AGENT_ID "/%s@%s|%.32s", rusername, rhostname,
+		new->server_cookie);
+
+	/* note, the BP is guaranteed by the spec to be <NUL> terminated */
+	D(("initialization packet [%s]", PAM_BP_DATA(new->current_prompt)));
+
+	/* fall through */
+	new->state = PS_STATE_PROMPT1;
+
+	D(("fall through to state_prompt1"));
+    }
+
+    case PS_STATE_PROMPT1:
+    {
+	int i, length;
+
+	/* send {secret@here/jdoe@client.host|<s_cookie>} */
+	retval = converse(pamh, new);
+	if (retval != PAM_SUCCESS) {
+	    if (retval == PAM_CONV_AGAIN) {
+		D(("conversation failed to complete"));
+		return PAM_INCOMPLETE;
+	    } else {
+		new->state = PS_STATE_DEAD;
+		return retval;
+	    }
+	}
+
+	if (retval != PAM_SUCCESS) {
+	    D(("failed to read ruser@rhost"));
+	    new->state = PS_STATE_DEAD;
+	    return PAM_AUTH_ERR;
+	}
+
+	/* expect to receive the following {<seqid>|<a_cookie>} */
+	if (new->current_reply == NULL) {
+	    D(("converstation returned [%s] but gave no reply",
+	       pam_strerror(pamh, retval)));
+	    new->state = PS_STATE_DEAD;
+	    return PAM_CONV_ERR;
+	}
+
+	/* find | */
+	length = PAM_BP_LENGTH(new->current_reply);
+	for (i=0; i<length; ++i) {
+	    if (PAM_BP_RDATA(new->current_reply)[i] == '|') {
+		break;
+	    }
+	}
+	if (i >= length) {
+	    D(("malformed response (no |) of length %d", length));
+	    new->state = PS_STATE_DEAD;
+	    return PAM_CONV_ERR;
+	}
+	if ((length - ++i) != 32) {
+	    D(("cookie is incorrect length (%d,%d) %d != 32",
+	       length, i, length-i));
+	    new->state = PS_STATE_DEAD;
+	    return PAM_CONV_ERR;
+	}
+
+	/* copy client cookie */
+	memcpy(new->client_cookie, PAM_BP_RDATA(new->current_reply)+i, 32);
+
+	/* generate a prompt that is length(seqid) + length(|) + 32 long */
+	PAM_BP_RENEW(&new->current_prompt, PAM_BPC_OK, i+32);
+	/* copy the head of the response prompt */
+	memcpy(PAM_BP_WDATA(new->current_prompt),
+	       PAM_BP_RDATA(new->current_reply), i);
+	PAM_BP_RENEW(&new->current_reply, 0, 0);
+
+	/* look up the secret */
+	new->invalid_secret = 0;
+
+	if (new->secret_data == NULL) {
+	    char *ruser_rhost;
+
+	    ruser_rhost = malloc(strlen(rusername)+2+strlen(rhostname));
+	    if (ruser_rhost == NULL) {
+		D(("out of memory"));
+		new->state = PS_STATE_DEAD;
+		return PAM_BUF_ERR;
+	    }
+	    sprintf(ruser_rhost, "%s@%s", rusername, rhostname);
+	    new->secret_data = identify_secret(ruser_rhost, new->username);
+
+	    memset(ruser_rhost, 0, strlen(ruser_rhost));
+	    free(ruser_rhost);
+	}
+
+	if (new->secret_data == NULL) {
+	    D(("secret not found for user"));
+	    new->invalid_secret = 1;
+
+	    /* need to make up a secret */
+	    new->secret_data = malloc(32 + 1);
+	    if (new->secret_data == NULL) {
+		D(("out of memory"));
+		new->state = PS_STATE_DEAD;
+		return PAM_BUF_ERR;
+	    }
+	    if (! generate_cookie(new->secret_data)) {
+		D(("what's up - no fake cookie generated?"));
+		new->state = PS_STATE_DEAD;
+		return PAM_ABORT;
+	    }
+	}
+
+	/* construct md5[<client_cookie>|<server_cookie>|<secret_data>] */
+	if (! create_digest(new->client_cookie, new->server_cookie,
+			    new->secret_data,
+			    PAM_BP_WDATA(new->current_prompt)+i)) {
+	    D(("md5 digesting failed"));
+	    new->state = PS_STATE_DEAD;
+	    return PAM_ABORT;
+	}
+
+	/* prompt2 is now constructed - fall through to send it */
+    }
+
+    case PS_STATE_PROMPT2:
+    {
+	/* send {<seqid>|md5[<client_cookie>|<server_cookie>|<secret_data>]} */
+	retval = converse(pamh, new);
+	if (retval != PAM_SUCCESS) {
+	    if (retval == PAM_CONV_AGAIN) {
+		D(("conversation failed to complete"));
+		return PAM_INCOMPLETE;
+	    } else {
+		new->state = PS_STATE_DEAD;
+		return retval;
+	    }
+	}
+
+	/* After we complete this section, we should not be able to
+	   recall this authentication function. So, we force all
+	   future calls into the weeds. */
+
+	new->state = PS_STATE_DEAD;
+
+	/* expect reply:{md5[<secret_data>|<server_cookie>|<client_cookie>]} */
+
+	{
+	    int cf;
+	    char expectation[33];
+
+	    if (!create_digest(new->secret_data, new->server_cookie,
+			       new->client_cookie, expectation)) {
+		new->state = PS_STATE_DEAD;
+		return PAM_ABORT;
+	    }
+
+	    cf = strcmp(expectation, PAM_BP_RDATA(new->current_reply));
+	    memset(expectation, 0, sizeof(expectation));
+	    if (cf || new->invalid_secret) {
+		D(("failed to authenticate"));
+		return PAM_AUTH_ERR;
+	    }
+	}
+
+	D(("correctly authenticated :)"));
+	return PAM_SUCCESS;
+    }
+
+    default:
+	new->state = PS_STATE_DEAD;
+
+    case PS_STATE_DEAD:
+
+	D(("state is currently dead/unknown"));
+	return PAM_AUTH_ERR;
+    }
+
+    fprintf(stderr, "pam_secret: this should not be reached\n");
+    return PAM_ABORT;
+}
+
+static void clean_data(pam_handle_t *pamh, void *datum, int error_status)
+{
+    struct ps_state_s *data = datum;
+
+    D(("liberating datum=%p", datum));
+
+    if (data) {
+	D(("renew prompt"));
+	PAM_BP_RENEW(&data->current_prompt, 0, 0);
+	D(("renew reply"));
+	PAM_BP_RENEW(&data->current_reply, 0, 0);
+	D(("overwrite datum"));
+	memset(data, 0, sizeof(struct ps_state_s));
+	D(("liberate datum"));
+	free(data);
+    }
+
+    D(("done."));
+}
+
+/*
+ * front end for the authentication function
+ */
+
+int pam_sm_authenticate(pam_handle_t *pamh, int flags,
+			int argc, const char **argv)
+{
+    int retval;
+    struct ps_state_s *new_data;
+    const struct ps_state_s *old_data;
+
+    D(("called"));
+
+    new_data = calloc(1, sizeof(struct ps_state_s));
+    if (new_data == NULL) {
+	D(("out of memory"));
+	return PAM_BUF_ERR;
+    }
+    new_data->retval = PAM_SUCCESS;
+
+    retval = pam_get_data(pamh, PS_STATE_ID, (const void **) &old_data);
+    if (retval == PAM_SUCCESS) {
+	new_data->state = old_data->state;
+	memcpy(new_data->server_cookie, old_data->server_cookie, 32);
+	memcpy(new_data->client_cookie, old_data->client_cookie, 32);
+	if (old_data->username) {
+	    new_data->username = strdup(old_data->username);
+	}
+	if (old_data->secret_data) {
+	    new_data->secret_data = strdup(old_data->secret_data);
+	}
+	if (old_data->current_prompt) {
+	    int length;
+
+	    length = PAM_BP_LENGTH(old_data->current_prompt);
+	    PAM_BP_RENEW(&new_data->current_prompt,
+			 PAM_BP_CONTROL(old_data->current_prompt), length);
+	    PAM_BP_FILL(new_data->current_prompt, 0, length,
+			PAM_BP_RDATA(old_data->current_prompt));
+	}
+	/* don't need to duplicate current_reply */
+    } else {
+	old_data = NULL;
+	new_data->state = PS_STATE_INIT;
+    }
+
+    D(("call auth_sequence"));
+    new_data->retval = auth_sequence(pamh, old_data, new_data);
+    D(("returned from auth_sequence"));
+
+    retval = pam_set_data(pamh, PS_STATE_ID, new_data, clean_data);
+    if (retval != PAM_SUCCESS) {
+	D(("unable to store new_data"));
+    } else {
+	retval = new_data->retval;
+    }
+
+    old_data = new_data = NULL;
+
+    D(("done (%d)", retval));
+    return retval;
+}
+
+/*
+ * front end for the credential setting function
+ */
+
+#define AUTH_SESSION_TICKET_ENV_FORMAT "AUTH_SESSION_TICKET="
+
+int pam_sm_setcred(pam_handle_t *pamh, int flags,
+		   int argc, const char **argv)
+{
+    int retval;
+    const struct ps_state_s *old_data;
+
+    D(("called"));
+
+    /* XXX - need to pay attention to the various flavors of call */
+
+    /* XXX - need provide an option to turn this feature on/off: if
+       other modules want to supply an AUTH_SESSION_TICKET, we should
+       leave it up to the admin which module dominiates. */
+
+    retval = pam_get_data(pamh, PS_STATE_ID, (const void **) &old_data);
+    if (retval != PAM_SUCCESS) {
+	D(("no data to base decision on"));
+	return PAM_AUTH_ERR;
+    }
+
+    /*
+     * If ok, export a derived shared secret session ticket to the
+     * client's PAM environment - the ticket has the form
+     *
+     * AUTH_SESSION_TICKET =
+     *        md5[<server_cookie>|<secret_data>|<client_cookie>]
+     *
+     * This is a precursor to supporting a spoof resistant trusted
+     * path mechanism. This shared secret ticket can be used to add
+     * a hard-to-guess checksum to further authentication data.
+     */
+
+    retval = old_data->retval;
+    if (retval == PAM_SUCCESS) {
+	char envticket[sizeof(AUTH_SESSION_TICKET_ENV_FORMAT)+32];
+
+	memcpy(envticket, AUTH_SESSION_TICKET_ENV_FORMAT,
+	       sizeof(AUTH_SESSION_TICKET_ENV_FORMAT));
+
+	if (! create_digest(old_data->server_cookie, old_data->secret_data,
+			    old_data->client_cookie,
+			    envticket+sizeof(AUTH_SESSION_TICKET_ENV_FORMAT)-1
+	    )) {
+	    D(("unable to generate a digest for session ticket"));
+	    return PAM_ABORT;
+	}
+
+	D(("putenv[%s]", envticket));
+	retval = pam_putenv(pamh, envticket);
+	memset(envticket, 0, sizeof(envticket));
+    }
+
+    old_data = NULL;
+    D(("done (%d)", retval));
+
+    return retval;
+}
diff --git a/libpamc/test/regress/Makefile b/libpamc/test/regress/Makefile
new file mode 100644
index 0000000..cba474f
--- /dev/null
+++ b/libpamc/test/regress/Makefile
@@ -0,0 +1,7 @@
+CFLAGS = -g -I ../../include
+
+test.libpamc: test.libpamc.o
+	$(CC) -o $@ $(CFLAGS) $< -L ../.. -lpamc
+
+clean:
+	rm -f test.libpamc test.libpamc.o
diff --git a/libpamc/test/regress/run_test.sh b/libpamc/test/regress/run_test.sh
new file mode 100755
index 0000000..6922f03
--- /dev/null
+++ b/libpamc/test/regress/run_test.sh
@@ -0,0 +1,6 @@
+#!/bin/sh
+
+LD_LIBRARY_PATH=../.. ; export LD_LIBRARY_PATH
+PAMC_AGENT_PATH="../agents" ; export PAMC_AGENT_PATH
+
+./test.libpamc
diff --git a/libpamc/test/regress/test.libpamc.c b/libpamc/test/regress/test.libpamc.c
new file mode 100644
index 0000000..4251b4f
--- /dev/null
+++ b/libpamc/test/regress/test.libpamc.c
@@ -0,0 +1,343 @@
+/*
+ * This is a small test program for testing libpamc against the
+ * secret@here agent. It does the same as the test.secret@here perl
+ * script in this directory, but via the libpamc API.
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <security/pam_client.h>
+#include <ctype.h>
+
+struct internal_packet {
+    int length;
+    int at;
+    char *buffer;
+};
+
+
+void append_data(struct internal_packet *packet, int extra, const char *data)
+{
+    if ((extra + packet->at) >= packet->length) {
+	if (packet->length == 0) {
+	    packet->length = 1000;
+	}
+	/* make sure we have at least a char extra space available */
+	while (packet->length <= (extra + packet->at)) {
+	    packet->length <<= 1;
+	}
+	packet->buffer = realloc(packet->buffer, packet->length);
+	if (packet->buffer == NULL) {
+	    fprintf(stderr, "out of memory\n");
+	    exit(1);
+	}
+    }
+
+    if (data != NULL) {
+	memcpy(packet->at + packet->buffer, data, extra);
+    }
+    packet->at += extra;
+
+    /* assisting string manipulation */
+    packet->buffer[packet->at] = '\0';
+}
+
+void append_string(struct internal_packet *packet, const char *string,
+		   int with_nul)
+{
+    append_data(packet, strlen(string) + (with_nul ? 1:0), string);
+}
+
+char *identify_secret(char *identity)
+{
+    struct internal_packet temp_packet;
+    FILE *secrets;
+    int length_id;
+
+    temp_packet.length = temp_packet.at = 0;
+    temp_packet.buffer = NULL;
+
+    append_string(&temp_packet, "/home/", 0);
+    append_string(&temp_packet, getlogin(), 0);
+    append_string(&temp_packet, "/.secret@here", 1);
+
+    secrets = fopen(temp_packet.buffer, "r");
+    if (secrets == NULL) {
+	fprintf(stderr, "server: failed to open\n  [%s]\n",
+		temp_packet.buffer);
+	exit(1);
+    }
+
+    length_id = strlen(identity);
+    for (;;) {
+	char *secret = NULL;
+	temp_packet.at = 0;
+
+	if (fgets(temp_packet.buffer, temp_packet.length, secrets) == NULL) {
+	    fclose(secrets);
+	    return NULL;
+	}
+
+	if (memcmp(temp_packet.buffer, identity, length_id)) {
+	    continue;
+	}
+
+	fclose(secrets);
+	for (secret=temp_packet.buffer; *secret; ++secret) {
+	    if (*secret == ' ' || *secret == '\n' || *secret == '\t') {
+		break;
+	    }
+	}
+	for (; *secret; ++secret) {
+	    if (!(*secret == ' ' || *secret == '\n' || *secret == '\t')) {
+		break;
+	    }
+	}
+
+	for (temp_packet.buffer=secret; *temp_packet.buffer;
+	     ++temp_packet.buffer) {
+	    if (*temp_packet.buffer == ' ' || *temp_packet.buffer == '\n'
+		|| *temp_packet.buffer == '\t') {
+		break;
+	    }
+	}
+	if (*temp_packet.buffer) {
+	    *temp_packet.buffer = '\0';
+	}
+
+	return secret;
+    }
+
+    /* NOT REACHED */
+}
+
+/*
+ * This is a hack, and is fundamentally insecure. All our secrets will be
+ * displayed on the command line for someone doing 'ps' to see. This
+ * is just for programming convenience in this instance, since this
+ * program is simply a regression test. The pam_secret module should
+ * not do this, but make use of md5 routines directly.
+ */
+
+char *create_digest(int length, const char *raw)
+{
+    struct internal_packet temp_packet;
+    FILE *pipe;
+
+    temp_packet.length = temp_packet.at = 0;
+    temp_packet.buffer = NULL;
+
+    append_string(&temp_packet, "echo -n '", 0);
+    append_string(&temp_packet, raw, 0);
+    append_string(&temp_packet, "'|/usr/bin/md5sum -", 1);
+
+    fprintf(stderr, "am attempting to run [%s]\n", temp_packet.buffer);
+
+    pipe = popen(temp_packet.buffer, "r");
+    if (pipe == NULL) {
+	fprintf(stderr, "server: failed to run\n  [%s]\n", temp_packet.buffer);
+	exit(1);
+    }
+
+    temp_packet.at = 0;
+    append_data(&temp_packet, 32, NULL);
+
+    if (fgets(temp_packet.buffer, 33, pipe) == NULL) {
+	fprintf(stderr, "server: failed to read digest\n");
+	exit(1);
+    }
+    if (strlen(temp_packet.buffer) != 32) {
+	fprintf(stderr, "server: digest was not 32 chars?? [%s]\n",
+		temp_packet.buffer);
+	exit(1);
+    }
+
+    fclose(pipe);
+
+    return temp_packet.buffer;
+}
+
+void packet_to_prompt(pamc_bp_t *prompt_p, uint8_t control,
+		      struct internal_packet *packet)
+{
+    PAM_BP_RENEW(prompt_p, control, packet->at);
+    PAM_BP_FILL(*prompt_p, 0, packet->at, packet->buffer);
+    packet->at = 0;
+}
+
+void prompt_to_packet(pamc_bp_t prompt, struct internal_packet *packet)
+{
+    int data_length;
+
+    data_length = PAM_BP_LENGTH(prompt);
+    packet->at = 0;
+    append_data(packet, data_length, NULL);
+
+    PAM_BP_EXTRACT(prompt, 0, data_length, packet->buffer);
+
+    fprintf(stderr, "server received[%d]: {%d|0x%.2x|%s}\n",
+	    data_length,
+	    PAM_BP_SIZE(prompt), PAM_BP_RCONTROL(prompt),
+	    PAM_BP_RDATA(prompt));
+}
+
+int main(int argc, char **argv)
+{
+    pamc_handle_t pch;
+    pamc_bp_t prompt = NULL;
+    struct internal_packet packet_data, *packet;
+    char *temp_string, *secret, *user, *a_cookie, *seqid, *digest;
+    const char *cookie = "123451234512345";
+    int retval;
+
+    packet = &packet_data;
+    packet->length = 0;
+    packet->at = 0;
+    packet->buffer = NULL;
+
+    pch = pamc_start();
+    if (pch == NULL) {
+	fprintf(stderr, "server: unable to get a handle from libpamc\n");
+	exit(1);
+    }
+
+    temp_string = getlogin();
+    if (temp_string == NULL) {
+	fprintf(stderr, "server: who are you?\n");
+	exit(1);
+    }
+#define DOMAIN "@local.host"
+    user = malloc(1+strlen(temp_string)+strlen(DOMAIN));
+    if (user == NULL) {
+	fprintf(stderr, "server: out of memory for user id\n");
+	exit(1);
+    }
+    sprintf(user, "%s%s", temp_string, DOMAIN);
+
+    append_string(packet, "secret@here/", 0);
+    append_string(packet, user, 0);
+    append_string(packet, "|", 0);
+    append_string(packet, cookie, 0);
+    packet_to_prompt(&prompt, PAM_BPC_SELECT, packet);
+
+    /* get the library to accept the first packet (which should load
+       the secret@here agent) */
+
+    retval = pamc_converse(pch, &prompt);
+    fprintf(stderr, "server: after conversation\n");
+    if (PAM_BP_RCONTROL(prompt) != PAM_BPC_OK) {
+	fprintf(stderr, "server: prompt had unexpected control type: %u\n",
+		PAM_BP_RCONTROL(prompt));
+	exit(1);
+    }
+
+    fprintf(stderr, "server: got a prompt back\n");
+
+    prompt_to_packet(prompt, packet);
+
+    temp_string = strtok(packet->buffer, "|");
+    if (temp_string == NULL) {
+	fprintf(stderr, "server: prompt does not contain anything");
+	exit(1);
+    }
+    seqid = strdup(temp_string);
+    if (seqid == NULL) {
+	fprintf(stderr, "server: unable to store sequence id\n");
+    }
+
+    temp_string = strtok(NULL, "|");
+    if (temp_string == NULL) {
+	fprintf(stderr, "server: no cookie from agent\n");
+	exit(1);
+    }
+    a_cookie = strdup(temp_string);
+    if (a_cookie == NULL) {
+	fprintf(stderr, "server: no memory to store agent cookie\n");
+	exit(1);
+    }
+
+    fprintf(stderr, "server: agent responded with {%s|%s}\n", seqid, a_cookie);
+    secret = identify_secret(user);
+    fprintf(stderr, "server: secret=%s\n", secret);
+
+    /* now, we construct the response */
+    packet->at = 0;
+    append_string(packet, a_cookie, 0);
+    append_string(packet, "|", 0);
+    append_string(packet, cookie, 0);
+    append_string(packet, "|", 0);
+    append_string(packet, secret, 0);
+
+    fprintf(stderr, "server: get digest of %s\n", packet->buffer);
+
+    digest = create_digest(packet->at, packet->buffer);
+
+    fprintf(stderr, "server: secret=%s, digest=%s\n", secret, digest);
+
+    packet->at = 0;
+    append_string(packet, seqid, 0);
+    append_string(packet, "|", 0);
+    append_string(packet, digest, 0);
+    packet_to_prompt(&prompt, PAM_BPC_OK, packet);
+
+    retval = pamc_converse(pch, &prompt);
+    fprintf(stderr, "server: after 2nd conversation\n");
+    if (PAM_BP_RCONTROL(prompt) != PAM_BPC_DONE) {
+	fprintf(stderr, "server: 2nd prompt had unexpected control type: %u\n",
+		PAM_BP_RCONTROL(prompt));
+	exit(1);
+    }
+
+    prompt_to_packet(prompt, packet);
+    PAM_BP_RENEW(&prompt, 0, 0);
+
+    temp_string = strtok(packet->buffer, "|");
+    if (temp_string == NULL) {
+	fprintf(stderr, "no digest from agent\n");
+	exit(1);
+    }
+    temp_string = strdup(temp_string);
+
+    packet->at = 0;
+    append_string(packet, secret, 0);
+    append_string(packet, "|", 0);
+    append_string(packet, cookie, 0);
+    append_string(packet, "|", 0);
+    append_string(packet, a_cookie, 0);
+
+    fprintf(stderr, "server: get digest of %s\n", packet->buffer);
+
+    digest = create_digest(packet->at, packet->buffer);
+
+    fprintf(stderr, "server: digest=%s\n", digest);
+
+    if (strcmp(digest, temp_string)) {
+	fprintf(stderr, "server: agent doesn't know the secret\n");
+	fprintf(stderr, "server: agent says:  [%s]\n"
+	                "server: server says: [%s]\n", temp_string, digest);
+	exit(1);
+    } else {
+	fprintf(stderr, "server: agent seems to know the secret\n");
+
+	packet->at = 0;
+	append_string(packet, cookie, 0);
+	append_string(packet, "|", 0);
+	append_string(packet, secret, 0);
+	append_string(packet, "|", 0);
+	append_string(packet, a_cookie, 0);
+
+	digest = create_digest(packet->at, packet->buffer);
+
+	fprintf(stderr, "server: putenv(\"AUTH_SESSION_TICKET=%s\")\n",
+		digest);
+    }
+
+
+    retval = pamc_end(&pch);
+
+    fprintf(stderr, "server: agent(s) were %shappy to terminate\n",
+	    retval == PAM_BPC_TRUE ? "":"un");
+
+    exit(!retval);
+}
diff --git a/libpamc/test/regress/test.secret@here b/libpamc/test/regress/test.secret@here
new file mode 100755
index 0000000..67fe22e
--- /dev/null
+++ b/libpamc/test/regress/test.secret@here
@@ -0,0 +1,151 @@
+#!/usr/bin/perl
+
+##
+## this is a test script for regressing changes to the secret@here PAM
+## agent
+##
+
+$^W = 1;
+use strict;
+use IPC::Open2;
+
+$| = 1;
+
+my $whoami = `/usr/bin/whoami`; chomp $whoami;
+my $cookie = "12345";
+my $user_domain = "$whoami\@local.host";
+
+my $pid = open2(\*Reader, \*Writer, "../agents/secret\@here blah")
+    or die "failed to load secret\@here agent";
+
+unless (-f (getpwuid($<))[7]."/.secret\@here") {
+    print STDERR "server: ". "no " .(getpwuid($<))[7]. "/.secret\@here file\n";
+    die "no config file";
+}
+
+WriteBinaryPrompt(\*Writer, 0x02, "secret\@here/$user_domain|$cookie");
+
+my ($control, $data) = ReadBinaryPrompt(\*Reader);
+
+print STDERR "server: ". "reply: control=$control, data=$data\n";
+if ($control != 1) {
+    die "expected 1 (OK) for the first agent reply; got $control";
+}
+my ($seqid, $a_cookie) = split '\|', $data;
+
+# server needs to convince agent that it knows the secret before
+# agent will give a valid response
+my $secret = IdentifyLocalSecret($user_domain);
+my $digest = CreateDigest($a_cookie."|".$cookie."|".$secret);
+
+print STDERR "server: ". "digest = $digest\n";
+WriteBinaryPrompt(\*Writer, 0x01, "$seqid|$digest");
+
+# The agent will authenticate us and then reply with its
+# authenticating digest. we check that before we're done.
+
+($control, $data) = ReadBinaryPrompt(\*Reader);
+if ($control != 0x03) {
+    die "server: agent did not reply with a 'done' prompt ($control)\n";
+}
+
+unless ($data eq CreateDigest($secret."|".$cookie."|".$a_cookie)) {
+    die "server: agent is not authenticated\n";
+}
+
+print STDERR "server: agent appears to know secret\n";
+
+my $session_authenticated_ticket
+    = CreateDigest($cookie."|".$secret."|".$a_cookie);
+
+print STDERR "server: should putenv("
+	    ."\"AUTH_SESSION_TICKET=$session_authenticated_ticket\")\n";
+
+exit 0;
+
+sub CreateDigest ($) {
+    my ($data) = @_;
+
+    my $pid = open2(\*MD5out, \*MD5in, "/usr/bin/md5sum -")
+	or die "you'll need /usr/bin/md5sum installed";
+
+    my $oldfd = select MD5in; $|=1; select $oldfd;
+    print MD5in "$data";
+    close MD5in;
+    my $reply = <MD5out>;
+    ($reply) = split /\s/, $reply;
+    print STDERR "server: ". "md5 said: <$reply>\n";
+    close MD5out;
+
+    return $reply;
+}
+
+sub ReadBinaryPrompt ($) {
+    my ($fd) = @_;
+
+    my $buffer = "     ";
+    my $count = read($fd, $buffer, 5);
+    if ($count == 0) {
+	# no more packets to read
+	return (0, "");
+    }
+
+    if ($count != 5) {
+	# broken packet header
+	return (-1, "");
+    }
+
+    my ($length, $control) = unpack("N C", $buffer);
+    if ($length < 5) {
+	# broken packet length
+	return (-1, "");
+    }
+
+    my $data = "";
+    $length -= 5;
+    while ($count = read($fd, $buffer, $length)) {
+	$data .= $buffer;
+	if ($count != $length) {
+	    $length -= $count;
+	    next;
+	}
+
+	print STDERR "server: ". "data is [$data]\n";
+
+	return ($control, $data);
+    }
+
+    # broken packet data
+    return (-1, "");
+}
+
+sub WriteBinaryPrompt ($$$) {
+    my ($fd, $control, $data) = @_;
+
+    my $length = 5 + length($data);
+    printf STDERR "server: ". "{%d|0x%.2x|%s}\n", $length, $control, $data;
+    my $bp = pack("N C a*", $length, $control, $data);
+    print $fd $bp;
+
+    print STDERR "server: ". "control passed to agent\@here\n";
+}
+
+sub IdentifyLocalSecret ($) {
+    my ($identifier) = @_;
+    my $secret;
+
+    my $whoami = `/usr/bin/whoami` ; chomp $whoami;
+    if (open SECRETS, "< " .(getpwuid($<))[7]. "/.secret\@here") {
+	my $line;
+	while (defined ($line = <SECRETS>)) {
+	    my ($id, $sec) = split /[\s]/, $line;
+	    if ((defined $id) && ($id eq $identifier)) {
+		$secret = $sec;
+		last;
+	    }
+	}
+	close SECRETS;
+    }
+
+    return $secret;
+}