Adding upstream version 1:2.3.19.1+dfsg1.upstream/1%2.3.19.1+dfsg1upstream

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

14 files changed, 3366 insertions, 0 deletions

diff --git a/src/imap-urlauth/Makefile.am b/src/imap-urlauth/Makefile.am
new file mode 100644
index 0000000..c9a37e6
--- /dev/null
+++ b/src/imap-urlauth/Makefile.am
@@ -0,0 +1,85 @@
+pkglibexecdir = $(libexecdir)/dovecot
+
+# Refer to comment in imap-urlauth.c for info on what these binaries are for.
+pkglibexec_PROGRAMS = imap-urlauth-login imap-urlauth imap-urlauth-worker
+
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/lib \
+	-I$(top_srcdir)/src/lib-settings \
+	-I$(top_srcdir)/src/lib-auth \
+	-I$(top_srcdir)/src/lib-master \
+	$(BINARY_CFLAGS)
+
+# imap-urlauth-login
+
+imap_urlauth_login_CPPFLAGS = \
+	$(AM_CPPFLAGS) \
+	-I$(top_srcdir)/src/login-common
+
+imap_urlauth_login_LDADD = \
+	$(LIBDOVECOT_LOGIN) \
+	$(LIBDOVECOT) \
+	$(SSL_LIBS) \
+	$(BINARY_LDFLAGS)
+
+imap_urlauth_login_DEPENDENCIES = \
+	$(LIBDOVECOT_LOGIN_DEPS) \
+	$(LIBDOVECOT_DEPS)
+
+imap_urlauth_login_SOURCES = \
+	imap-urlauth-login.c \
+	imap-urlauth-login-settings.c
+
+# imap-urlauth
+
+imap_urlauth_CPPFLAGS = \
+	$(AM_CPPFLAGS) \
+	-I$(top_srcdir)/src/lib-dict \
+	-DPKG_RUNDIR=\""$(rundir)"\"
+
+imap_urlauth_LDFLAGS = -export-dynamic
+
+imap_urlauth_LDADD = $(LIBDOVECOT) \
+	$(BINARY_LDFLAGS)
+
+imap_urlauth_DEPENDENCIES = $(LIBDOVECOT_DEPS)
+
+imap_urlauth_SOURCES = \
+	imap-urlauth.c \
+	imap-urlauth-client.c \
+	imap-urlauth-settings.c
+
+# imap-urlauth-worker
+
+imap_urlauth_worker_CPPFLAGS = \
+	$(AM_CPPFLAGS) \
+	-I$(top_srcdir)/src/lib-dict \
+	-I$(top_srcdir)/src/imap \
+	-I$(top_srcdir)/src/lib-imap \
+	-I$(top_srcdir)/src/lib-imap-storage \
+	-I$(top_srcdir)/src/lib-imap-urlauth \
+	-I$(top_srcdir)/src/lib-mail \
+	-I$(top_srcdir)/src/lib-index \
+	-I$(top_srcdir)/src/lib-storage \
+	-I$(top_srcdir)/src/login-common
+
+imap_urlauth_worker_LDFLAGS = -export-dynamic \
+	$(BINARY_LDFLAGS)
+
+urlauth_libs = \
+	$(top_builddir)/src/lib-imap-urlauth/libimap-urlauth.la
+
+imap_urlauth_worker_LDADD = $(urlauth_libs) $(LIBDOVECOT_STORAGE) $(LIBDOVECOT)
+imap_urlauth_worker_DEPENDENCIES = $(urlauth_libs) $(LIBDOVECOT_STORAGE_DEPS) $(LIBDOVECOT_DEPS)
+
+imap_urlauth_worker_SOURCES = \
+	imap-urlauth-worker.c \
+	imap-urlauth-worker-settings.c
+
+noinst_HEADERS = \
+	imap-urlauth-client.h \
+	imap-urlauth-common.h \
+	imap-urlauth-settings.h \
+	imap-urlauth-login-settings.h \
+	imap-urlauth-worker-settings.h
+
diff --git a/src/imap-urlauth/Makefile.in b/src/imap-urlauth/Makefile.in
new file mode 100644
index 0000000..d4dcb4e
--- /dev/null
+++ b/src/imap-urlauth/Makefile.in
@@ -0,0 +1,1014 @@
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+NM = @NM@
+NMEDIT = @NMEDIT@
+NOPLUGIN_LDFLAGS = @NOPLUGIN_LDFLAGS@
+OBJDUMP = @OBJDUMP@
+OBJEXT = @OBJEXT@
+OTOOL = @OTOOL@
+OTOOL64 = @OTOOL64@
+PACKAGE = @PACKAGE@
+PACKAGE_BUGREPORT = @PACKAGE_BUGREPORT@
+PACKAGE_NAME = @PACKAGE_NAME@
+PACKAGE_STRING = @PACKAGE_STRING@
+PACKAGE_TARNAME = @PACKAGE_TARNAME@
+PACKAGE_URL = @PACKAGE_URL@
+PACKAGE_VERSION = @PACKAGE_VERSION@
+PANDOC = @PANDOC@
+PATH_SEPARATOR = @PATH_SEPARATOR@
+PGSQL_CFLAGS = @PGSQL_CFLAGS@
+PGSQL_LIBS = @PGSQL_LIBS@
+PG_CONFIG = @PG_CONFIG@
+PIE_CFLAGS = @PIE_CFLAGS@
+PIE_LDFLAGS = @PIE_LDFLAGS@
+PKG_CONFIG = @PKG_CONFIG@
+PKG_CONFIG_LIBDIR = @PKG_CONFIG_LIBDIR@
+PKG_CONFIG_PATH = @PKG_CONFIG_PATH@
+QUOTA_LIBS = @QUOTA_LIBS@
+RANLIB = @RANLIB@
+RELRO_LDFLAGS = @RELRO_LDFLAGS@
+RPCGEN = @RPCGEN@
+RUN_TEST = @RUN_TEST@
+SED = @SED@
+SETTING_FILES = @SETTING_FILES@
+SET_MAKE = @SET_MAKE@
+SHELL = @SHELL@
+SQLITE_CFLAGS = @SQLITE_CFLAGS@
+SQLITE_LIBS = @SQLITE_LIBS@
+SQL_CFLAGS = @SQL_CFLAGS@
+SQL_LIBS = @SQL_LIBS@
+SSL_CFLAGS = @SSL_CFLAGS@
+SSL_LIBS = @SSL_LIBS@
+STRIP = @STRIP@
+SYSTEMD_CFLAGS = @SYSTEMD_CFLAGS@
+SYSTEMD_LIBS = @SYSTEMD_LIBS@
+VALGRIND = @VALGRIND@
+VERSION = @VERSION@
+ZSTD_CFLAGS = @ZSTD_CFLAGS@
+ZSTD_LIBS = @ZSTD_LIBS@
+abs_builddir = @abs_builddir@
+abs_srcdir = @abs_srcdir@
+abs_top_builddir = @abs_top_builddir@
+abs_top_srcdir = @abs_top_srcdir@
+ac_ct_AR = @ac_ct_AR@
+ac_ct_CC = @ac_ct_CC@
+ac_ct_CXX = @ac_ct_CXX@
+ac_ct_DUMPBIN = @ac_ct_DUMPBIN@
+am__include = @am__include@
+am__leading_dot = @am__leading_dot@
+am__quote = @am__quote@
+am__tar = @am__tar@
+am__untar = @am__untar@
+bindir = @bindir@
+build = @build@
+build_alias = @build_alias@
+build_cpu = @build_cpu@
+build_os = @build_os@
+build_vendor = @build_vendor@
+builddir = @builddir@
+datadir = @datadir@
+datarootdir = @datarootdir@
+dict_drivers = @dict_drivers@
+docdir = @docdir@
+dvidir = @dvidir@
+exec_prefix = @exec_prefix@
+host = @host@
+host_alias = @host_alias@
+host_cpu = @host_cpu@
+host_os = @host_os@
+host_vendor = @host_vendor@
+htmldir = @htmldir@
+includedir = @includedir@
+infodir = @infodir@
+install_sh = @install_sh@
+libdir = @libdir@
+libexecdir = @libexecdir@
+localedir = @localedir@
+localstatedir = @localstatedir@
+mandir = @mandir@
+mkdir_p = @mkdir_p@
+moduledir = @moduledir@
+oldincludedir = @oldincludedir@
+pdfdir = @pdfdir@
+prefix = @prefix@
+program_transform_name = @program_transform_name@
+psdir = @psdir@
+rundir = @rundir@
+runstatedir = @runstatedir@
+sbindir = @sbindir@
+sharedstatedir = @sharedstatedir@
+sql_drivers = @sql_drivers@
+srcdir = @srcdir@
+ssldir = @ssldir@
+statedir = @statedir@
+sysconfdir = @sysconfdir@
+systemdservicetype = @systemdservicetype@
+systemdsystemunitdir = @systemdsystemunitdir@
+target_alias = @target_alias@
+top_build_prefix = @top_build_prefix@
+top_builddir = @top_builddir@
+top_srcdir = @top_srcdir@
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/src/lib \
+	-I$(top_srcdir)/src/lib-settings \
+	-I$(top_srcdir)/src/lib-auth \
+	-I$(top_srcdir)/src/lib-master \
+	$(BINARY_CFLAGS)
+
+
+# imap-urlauth-login
+imap_urlauth_login_CPPFLAGS = \
+	$(AM_CPPFLAGS) \
+	-I$(top_srcdir)/src/login-common
+
+imap_urlauth_login_LDADD = \
+	$(LIBDOVECOT_LOGIN) \
+	$(LIBDOVECOT) \
+	$(SSL_LIBS) \
+	$(BINARY_LDFLAGS)
+
+imap_urlauth_login_DEPENDENCIES = \
+	$(LIBDOVECOT_LOGIN_DEPS) \
+	$(LIBDOVECOT_DEPS)
+
+imap_urlauth_login_SOURCES = \
+	imap-urlauth-login.c \
+	imap-urlauth-login-settings.c
+
+
+# imap-urlauth
+imap_urlauth_CPPFLAGS = \
+	$(AM_CPPFLAGS) \
+	-I$(top_srcdir)/src/lib-dict \
+	-DPKG_RUNDIR=\""$(rundir)"\"
+
+imap_urlauth_LDFLAGS = -export-dynamic
+imap_urlauth_LDADD = $(LIBDOVECOT) \
+	$(BINARY_LDFLAGS)
+
+imap_urlauth_DEPENDENCIES = $(LIBDOVECOT_DEPS)
+imap_urlauth_SOURCES = \
+	imap-urlauth.c \
+	imap-urlauth-client.c \
+	imap-urlauth-settings.c
+
+
+# imap-urlauth-worker
+imap_urlauth_worker_CPPFLAGS = \
+	$(AM_CPPFLAGS) \
+	-I$(top_srcdir)/src/lib-dict \
+	-I$(top_srcdir)/src/imap \
+	-I$(top_srcdir)/src/lib-imap \
+	-I$(top_srcdir)/src/lib-imap-storage \
+	-I$(top_srcdir)/src/lib-imap-urlauth \
+	-I$(top_srcdir)/src/lib-mail \
+	-I$(top_srcdir)/src/lib-index \
+	-I$(top_srcdir)/src/lib-storage \
+	-I$(top_srcdir)/src/login-common
+
+imap_urlauth_worker_LDFLAGS = -export-dynamic \
+	$(BINARY_LDFLAGS)
+
+urlauth_libs = \
+	$(top_builddir)/src/lib-imap-urlauth/libimap-urlauth.la
+
+imap_urlauth_worker_LDADD = $(urlauth_libs) $(LIBDOVECOT_STORAGE) $(LIBDOVECOT)
+imap_urlauth_worker_DEPENDENCIES = $(urlauth_libs) $(LIBDOVECOT_STORAGE_DEPS) $(LIBDOVECOT_DEPS)
+imap_urlauth_worker_SOURCES = \
+	imap-urlauth-worker.c \
+	imap-urlauth-worker-settings.c
+
+noinst_HEADERS = \
+	imap-urlauth-client.h \
+	imap-urlauth-common.h \
+	imap-urlauth-settings.h \
+	imap-urlauth-login-settings.h \
+	imap-urlauth-worker-settings.h
+
+all: all-am
+
+.SUFFIXES:
+.SUFFIXES: .c .lo .o .obj
+$(srcdir)/Makefile.in: @MAINTAINER_MODE_TRUE@ $(srcdir)/Makefile.am  $(am__configure_deps)
+	@for dep in $?; do \
+	  case '$(am__configure_deps)' in \
+	    *$$dep*) \
+	      ( cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh ) \
+	        && { if test -f $@; then exit 0; else break; fi; }; \
+	      exit 1;; \
+	  esac; \
+	done; \
+	echo ' cd $(top_srcdir) && $(AUTOMAKE) --foreign src/imap-urlauth/Makefile'; \
+	$(am__cd) $(top_srcdir) && \
+	  $(AUTOMAKE) --foreign src/imap-urlauth/Makefile
+Makefile: $(srcdir)/Makefile.in $(top_builddir)/config.status
+	@case '$?' in \
+	  *config.status*) \
+	    cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh;; \
+	  *) \
+	    echo ' cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles)'; \
+	    cd $(top_builddir) && $(SHELL) ./config.status $(subdir)/$@ $(am__maybe_remake_depfiles);; \
+	esac;
+
+$(top_builddir)/config.status: $(top_srcdir)/configure $(CONFIG_STATUS_DEPENDENCIES)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+
+$(top_srcdir)/configure: @MAINTAINER_MODE_TRUE@ $(am__configure_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(ACLOCAL_M4): @MAINTAINER_MODE_TRUE@ $(am__aclocal_m4_deps)
+	cd $(top_builddir) && $(MAKE) $(AM_MAKEFLAGS) am--refresh
+$(am__aclocal_m4_deps):
+install-pkglibexecPROGRAMS: $(pkglibexec_PROGRAMS)
+	@$(NORMAL_INSTALL)
+	@list='$(pkglibexec_PROGRAMS)'; test -n "$(pkglibexecdir)" || list=; \
+	if test -n "$$list"; then \
+	  echo " $(MKDIR_P) '$(DESTDIR)$(pkglibexecdir)'"; \
+	  $(MKDIR_P) "$(DESTDIR)$(pkglibexecdir)" || exit 1; \
+	fi; \
+	for p in $$list; do echo "$$p $$p"; done | \
+	sed 's/$(EXEEXT)$$//' | \
+	while read p p1; do if test -f $$p \
+	 || test -f $$p1 \
+	  ; then echo "$$p"; echo "$$p"; else :; fi; \
+	done | \
+	sed -e 'p;s,.*/,,;n;h' \
+	    -e 's|.*|.|' \
+	    -e 'p;x;s,.*/,,;s/$(EXEEXT)$$//;$(transform);s/$$/$(EXEEXT)/' | \
+	sed 'N;N;N;s,\n, ,g' | \
+	$(AWK) 'BEGIN { files["."] = ""; dirs["."] = 1 } \
+	  { d=$$3; if (dirs[d] != 1) { print "d", d; dirs[d] = 1 } \
+	    if ($$2 == $$4) files[d] = files[d] " " $$1; \
+	    else { print "f", $$3 "/" $$4, $$1; } } \
+	  END { for (d in files) print "f", d, files[d] }' | \
+	while read type dir files; do \
+	    if test "$$dir" = .; then dir=; else dir=/$$dir; fi; \
+	    test -z "$$files" || { \
+	    echo " $(INSTALL_PROGRAM_ENV) $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL_PROGRAM) $$files '$(DESTDIR)$(pkglibexecdir)$$dir'"; \
+	    $(INSTALL_PROGRAM_ENV) $(LIBTOOL) $(AM_LIBTOOLFLAGS) $(LIBTOOLFLAGS) --mode=install $(INSTALL_PROGRAM) $$files "$(DESTDIR)$(pkglibexecdir)$$dir" || exit $$?; \
+	    } \
+	; done
+
+uninstall-pkglibexecPROGRAMS:
+	@$(NORMAL_UNINSTALL)
+	@list='$(pkglibexec_PROGRAMS)'; test -n "$(pkglibexecdir)" || list=; \
+	files=`for p in $$list; do echo "$$p"; done | \
+	  sed -e 'h;s,^.*/,,;s/$(EXEEXT)$$//;$(transform)' \
+	      -e 's/$$/$(EXEEXT)/' \
+	`; \
+	test -n "$$list" || exit 0; \
+	echo " ( cd '$(DESTDIR)$(pkglibexecdir)' && rm -f" $$files ")"; \
+	cd "$(DESTDIR)$(pkglibexecdir)" && rm -f $$files
+
+clean-pkglibexecPROGRAMS:
+	@list='$(pkglibexec_PROGRAMS)'; test -n "$$list" || exit 0; \
+	echo " rm -f" $$list; \
+	rm -f $$list || exit $$?; \
+	test -n "$(EXEEXT)" || exit 0; \
+	list=`for p in $$list; do echo "$$p"; done | sed 's/$(EXEEXT)$$//'`; \
+	echo " rm -f" $$list; \
+	rm -f $$list
+
+imap-urlauth$(EXEEXT): $(imap_urlauth_OBJECTS) $(imap_urlauth_DEPENDENCIES) $(EXTRA_imap_urlauth_DEPENDENCIES) 
+	@rm -f imap-urlauth$(EXEEXT)
+	$(AM_V_CCLD)$(imap_urlauth_LINK) $(imap_urlauth_OBJECTS) $(imap_urlauth_LDADD) $(LIBS)
+
+imap-urlauth-login$(EXEEXT): $(imap_urlauth_login_OBJECTS) $(imap_urlauth_login_DEPENDENCIES) $(EXTRA_imap_urlauth_login_DEPENDENCIES) 
+	@rm -f imap-urlauth-login$(EXEEXT)
+	$(AM_V_CCLD)$(LINK) $(imap_urlauth_login_OBJECTS) $(imap_urlauth_login_LDADD) $(LIBS)
+
+imap-urlauth-worker$(EXEEXT): $(imap_urlauth_worker_OBJECTS) $(imap_urlauth_worker_DEPENDENCIES) $(EXTRA_imap_urlauth_worker_DEPENDENCIES) 
+	@rm -f imap-urlauth-worker$(EXEEXT)
+	$(AM_V_CCLD)$(imap_urlauth_worker_LINK) $(imap_urlauth_worker_OBJECTS) $(imap_urlauth_worker_LDADD) $(LIBS)
+
+mostlyclean-compile:
+	-rm -f *.$(OBJEXT)
+
+distclean-compile:
+	-rm -f *.tab.c
+
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/imap_urlauth-imap-urlauth-client.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/imap_urlauth-imap-urlauth-settings.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/imap_urlauth-imap-urlauth.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/imap_urlauth_login-imap-urlauth-login-settings.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/imap_urlauth_login-imap-urlauth-login.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/imap_urlauth_worker-imap-urlauth-worker-settings.Po@am__quote@ # am--include-marker
+@AMDEP_TRUE@@am__include@ @am__quote@./$(DEPDIR)/imap_urlauth_worker-imap-urlauth-worker.Po@am__quote@ # am--include-marker
+
+$(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
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(COMPILE) -c -o $@ $<
+
+.c.obj:
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(COMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ `$(CYGPATH_W) '$<'`
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(COMPILE) -c -o $@ `$(CYGPATH_W) '$<'`
+
+.c.lo:
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(LTCOMPILE) -MT $@ -MD -MP -MF $(DEPDIR)/$*.Tpo -c -o $@ $<
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/$*.Tpo $(DEPDIR)/$*.Plo
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='$<' object='$@' libtool=yes @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(LTCOMPILE) -c -o $@ $<
+
+imap_urlauth-imap-urlauth.o: imap-urlauth.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(imap_urlauth_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT imap_urlauth-imap-urlauth.o -MD -MP -MF $(DEPDIR)/imap_urlauth-imap-urlauth.Tpo -c -o imap_urlauth-imap-urlauth.o `test -f 'imap-urlauth.c' || echo '$(srcdir)/'`imap-urlauth.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/imap_urlauth-imap-urlauth.Tpo $(DEPDIR)/imap_urlauth-imap-urlauth.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='imap-urlauth.c' object='imap_urlauth-imap-urlauth.o' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(imap_urlauth_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o imap_urlauth-imap-urlauth.o `test -f 'imap-urlauth.c' || echo '$(srcdir)/'`imap-urlauth.c
+
+imap_urlauth-imap-urlauth.obj: imap-urlauth.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(imap_urlauth_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT imap_urlauth-imap-urlauth.obj -MD -MP -MF $(DEPDIR)/imap_urlauth-imap-urlauth.Tpo -c -o imap_urlauth-imap-urlauth.obj `if test -f 'imap-urlauth.c'; then $(CYGPATH_W) 'imap-urlauth.c'; else $(CYGPATH_W) '$(srcdir)/imap-urlauth.c'; fi`
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/imap_urlauth-imap-urlauth.Tpo $(DEPDIR)/imap_urlauth-imap-urlauth.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='imap-urlauth.c' object='imap_urlauth-imap-urlauth.obj' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(imap_urlauth_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o imap_urlauth-imap-urlauth.obj `if test -f 'imap-urlauth.c'; then $(CYGPATH_W) 'imap-urlauth.c'; else $(CYGPATH_W) '$(srcdir)/imap-urlauth.c'; fi`
+
+imap_urlauth-imap-urlauth-client.o: imap-urlauth-client.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(imap_urlauth_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT imap_urlauth-imap-urlauth-client.o -MD -MP -MF $(DEPDIR)/imap_urlauth-imap-urlauth-client.Tpo -c -o imap_urlauth-imap-urlauth-client.o `test -f 'imap-urlauth-client.c' || echo '$(srcdir)/'`imap-urlauth-client.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/imap_urlauth-imap-urlauth-client.Tpo $(DEPDIR)/imap_urlauth-imap-urlauth-client.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='imap-urlauth-client.c' object='imap_urlauth-imap-urlauth-client.o' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(imap_urlauth_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o imap_urlauth-imap-urlauth-client.o `test -f 'imap-urlauth-client.c' || echo '$(srcdir)/'`imap-urlauth-client.c
+
+imap_urlauth-imap-urlauth-client.obj: imap-urlauth-client.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(imap_urlauth_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT imap_urlauth-imap-urlauth-client.obj -MD -MP -MF $(DEPDIR)/imap_urlauth-imap-urlauth-client.Tpo -c -o imap_urlauth-imap-urlauth-client.obj `if test -f 'imap-urlauth-client.c'; then $(CYGPATH_W) 'imap-urlauth-client.c'; else $(CYGPATH_W) '$(srcdir)/imap-urlauth-client.c'; fi`
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/imap_urlauth-imap-urlauth-client.Tpo $(DEPDIR)/imap_urlauth-imap-urlauth-client.Po
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	$(AM_V_CC)source='imap-urlauth-client.c' object='imap_urlauth-imap-urlauth-client.obj' libtool=no @AMDEPBACKSLASH@
+@AMDEP_TRUE@@am__fastdepCC_FALSE@	DEPDIR=$(DEPDIR) $(CCDEPMODE) $(depcomp) @AMDEPBACKSLASH@
+@am__fastdepCC_FALSE@	$(AM_V_CC@am__nodep@)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(imap_urlauth_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -c -o imap_urlauth-imap-urlauth-client.obj `if test -f 'imap-urlauth-client.c'; then $(CYGPATH_W) 'imap-urlauth-client.c'; else $(CYGPATH_W) '$(srcdir)/imap-urlauth-client.c'; fi`
+
+imap_urlauth-imap-urlauth-settings.o: imap-urlauth-settings.c
+@am__fastdepCC_TRUE@	$(AM_V_CC)$(CC) $(DEFS) $(DEFAULT_INCLUDES) $(INCLUDES) $(imap_urlauth_CPPFLAGS) $(CPPFLAGS) $(AM_CFLAGS) $(CFLAGS) -MT imap_urlauth-imap-urlauth-settings.o -MD -MP -MF $(DEPDIR)/imap_urlauth-imap-urlauth-settings.Tpo -c -o imap_urlauth-imap-urlauth-settings.o `test -f 'imap-urlauth-settings.c' || echo '$(srcdir)/'`imap-urlauth-settings.c
+@am__fastdepCC_TRUE@	$(AM_V_at)$(am__mv) $(DEPDIR)/imap_urlauth-imap-urlauth-settings.Tpo $(DEPDIR)/imap_urlauth-imap-urlauth-settings.Po
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+	install-data install-data-am install-dvi install-dvi-am \
+	install-exec install-exec-am install-html install-html-am \
+	install-info install-info-am install-man install-pdf \
+	install-pdf-am install-pkglibexecPROGRAMS 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-pkglibexecPROGRAMS
+
+.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/src/imap-urlauth/imap-urlauth-client.c b/src/imap-urlauth/imap-urlauth-client.c
new file mode 100644
index 0000000..73f5b18
--- /dev/null
+++ b/src/imap-urlauth/imap-urlauth-client.c
@@ -0,0 +1,380 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "imap-urlauth-common.h"
+#include "array.h"
+#include "ioloop.h"
+#include "net.h"
+#include "fdpass.h"
+#include "istream.h"
+#include "ostream.h"
+#include "str.h"
+#include "strescape.h"
+#include "eacces-error.h"
+#include "llist.h"
+#include "hostpid.h"
+#include "execv-const.h"
+#include "env-util.h"
+#include "var-expand.h"
+#include "restrict-access.h"
+#include "master-service.h"
+#include "master-interface.h"
+
+#include <unistd.h>
+#include <sys/wait.h>
+
+#define IMAP_URLAUTH_PROTOCOL_MAJOR_VERSION 1
+#define IMAP_URLAUTH_PROTOCOL_MINOR_VERSION 0
+
+#define IMAP_URLAUTH_WORKER_SOCKET "imap-urlauth-worker"
+
+/* max. length of input lines (URLs) */
+#define MAX_INBUF_SIZE 2048
+
+/* Disconnect client after idling this many milliseconds */
+#define CLIENT_IDLE_TIMEOUT_MSECS (10*60*1000)
+
+#define USER_EXECUTABLE "imap-urlauth-worker"
+
+#define IS_STANDALONE() \
+        (getenv(MASTER_IS_PARENT_ENV) == NULL)
+
+static struct event_category event_category_urlauth = {
+	.name = "imap-urlauth",
+};
+
+struct client *imap_urlauth_clients;
+unsigned int imap_urlauth_client_count;
+
+static int client_worker_connect(struct client *client);
+static void client_worker_disconnect(struct client *client);
+static void client_worker_input(struct client *client);
+
+int client_create(const char *service, const char *username,
+		  int fd_in, int fd_out, const struct imap_urlauth_settings *set,
+		  struct client **client_r)
+{
+	struct client *client;
+	const char *app;
+
+	/* always use nonblocking I/O */
+	net_set_nonblock(fd_in, TRUE);
+	net_set_nonblock(fd_out, TRUE);
+
+	client = i_new(struct client, 1);
+	client->fd_in = fd_in;
+	client->fd_out = fd_out;
+	client->fd_ctrl = -1;
+	client->set = set;
+
+	client->event = event_create(NULL);
+	event_set_forced_debug(client->event, set->mail_debug);
+	event_add_category(client->event, &event_category_urlauth);
+	event_set_append_log_prefix(client->event, t_strdup_printf(
+		"user %s: ", username));
+
+	if (client_worker_connect(client) < 0) {
+		event_unref(&client->event);
+		i_free(client);
+		return -1;
+	}
+
+	/* determine user's special privileges */
+	i_array_init(&client->access_apps, 4);
+	if (username != NULL) {
+		if (set->imap_urlauth_submit_user != NULL &&
+		    strcmp(set->imap_urlauth_submit_user, username) == 0) {
+			e_debug(client->event, "User has URLAUTH submit access");
+			app = "submit+";
+			array_push_back(&client->access_apps, &app);
+		}
+		if (set->imap_urlauth_stream_user != NULL &&
+		    strcmp(set->imap_urlauth_stream_user, username) == 0) {
+			e_debug(client->event, "User has URLAUTH stream access");
+			app = "stream";
+			array_push_back(&client->access_apps, &app);
+		}
+	}
+
+	client->username = i_strdup(username);
+	client->service = i_strdup(service);
+
+	client->output = o_stream_create_fd(fd_out, SIZE_MAX);
+
+	imap_urlauth_client_count++;
+	DLLIST_PREPEND(&imap_urlauth_clients, client);
+
+	imap_urlauth_refresh_proctitle();
+	*client_r = client;
+	return 0;
+}
+
+void client_send_line(struct client *client, const char *fmt, ...)
+{
+	va_list va;
+	ssize_t ret;
+
+	if (client->output->closed)
+		return;
+
+	va_start(va, fmt);
+
+	T_BEGIN {
+		string_t *str;
+
+		str = t_str_new(256);
+		str_vprintfa(str, fmt, va);
+		str_append(str, "\n");
+
+		ret = o_stream_send(client->output,
+				    str_data(str), str_len(str));
+		i_assert(ret < 0 || (size_t)ret == str_len(str));
+	} T_END;
+
+	va_end(va);
+}
+
+static int client_worker_connect(struct client *client)
+{
+	static const char handshake[] = "VERSION\timap-urlauth-worker\t2\t0\n";
+	const char *socket_path;
+	ssize_t ret;
+	unsigned char data;
+
+	socket_path = t_strconcat(client->set->base_dir,
+				  "/"IMAP_URLAUTH_WORKER_SOCKET, NULL);
+
+	e_debug(client->event, "Connecting to worker socket %s", socket_path);
+
+	client->fd_ctrl = net_connect_unix_with_retries(socket_path, 1000);
+	if (client->fd_ctrl < 0) {
+		if (errno == EACCES) {
+			e_error(client->event, "imap-urlauth-client: %s",
+				eacces_error_get("net_connect_unix",
+						 socket_path));
+		} else {
+			e_error(client->event, "imap-urlauth-client: "
+				"net_connect_unix(%s) failed: %m",
+				socket_path);
+		}
+		return -1;
+	}
+
+	/* transfer one or two fds */
+	data = (client->fd_in == client->fd_out ? '0' : '1');
+	ret = fd_send(client->fd_ctrl, client->fd_in, &data, sizeof(data));
+	if (ret > 0 && client->fd_in != client->fd_out) {
+		data = '0';
+		ret = fd_send(client->fd_ctrl, client->fd_out,
+			      &data, sizeof(data));
+	}
+
+	if (ret <= 0) {
+		if (ret < 0) {
+			e_error(client->event, "fd_send(%s, %d) failed: %m",
+				socket_path, client->fd_ctrl);
+		} else {
+			e_error(client->event, "fd_send(%s, %d) failed to send byte",
+				socket_path, client->fd_ctrl);
+		}
+		client_worker_disconnect(client);
+		return -1;
+	}
+
+	client->ctrl_output = o_stream_create_fd(client->fd_ctrl, SIZE_MAX);
+
+	/* send protocol version handshake */
+	if (o_stream_send_str(client->ctrl_output, handshake) < 0) {
+		e_error(client->event,
+			"Error sending handshake to imap-urlauth worker: %m");
+		client_worker_disconnect(client);
+		return -1;
+	}
+
+	client->ctrl_input =
+		i_stream_create_fd(client->fd_ctrl, MAX_INBUF_SIZE);
+	client->ctrl_io =
+		io_add(client->fd_ctrl, IO_READ, client_worker_input, client);  
+	return 0;
+}
+
+void client_worker_disconnect(struct client *client)
+{
+	client->worker_state = IMAP_URLAUTH_WORKER_STATE_INACTIVE;
+
+	io_remove(&client->ctrl_io);
+	o_stream_destroy(&client->ctrl_output);
+	i_stream_destroy(&client->ctrl_input);
+	if (client->fd_ctrl >= 0) {
+		net_disconnect(client->fd_ctrl);
+		client->fd_ctrl = -1;
+	}
+}
+
+static int
+client_worker_input_line(struct client *client, const char *response)
+{
+	const char *const *apps;
+	unsigned int count, i;
+	bool restart;
+	string_t *str;
+	int ret;
+
+	switch (client->worker_state) {
+	case IMAP_URLAUTH_WORKER_STATE_INACTIVE:
+		if (strcasecmp(response, "OK") != 0) {
+			client_disconnect(client, "Worker handshake failed");
+			return -1;
+		}
+		client->worker_state = IMAP_URLAUTH_WORKER_STATE_CONNECTED;
+
+		str = t_str_new(256);
+		str_append(str, "ACCESS\t");
+		if (client->username != NULL)
+			str_append_tabescaped(str, client->username);
+		str_append(str, "\t");
+		str_append_tabescaped(str, client->service);
+		if (client->set->mail_debug)
+			str_append(str, "\tdebug");
+		if (array_count(&client->access_apps) > 0) {
+			str_append(str, "\tapps=");
+			apps = array_get(&client->access_apps, &count);
+			str_append(str, apps[0]);
+			for (i = 1; i < count; i++) {
+				str_append_c(str, ',');
+				str_append_tabescaped(str, apps[i]);
+			}
+		}
+		str_append(str, "\n");
+
+		ret = o_stream_send(client->ctrl_output,
+				    str_data(str), str_len(str));
+		i_assert(ret < 0 || (size_t)ret == str_len(str));
+		if (ret < 0) {
+			client_disconnect(client,
+				"Failed to send ACCESS control command to worker");
+			return -1;
+		}
+		break;
+
+	case IMAP_URLAUTH_WORKER_STATE_CONNECTED:
+		if (strcasecmp(response, "OK") != 0) {
+			client_disconnect(client,
+				"Failed to negotiate access parameters");
+			return -1;
+		}
+		client->worker_state = IMAP_URLAUTH_WORKER_STATE_ACTIVE;
+		break;
+
+	case IMAP_URLAUTH_WORKER_STATE_ACTIVE:
+		restart = TRUE;
+		if (strcasecmp(response, "DISCONNECTED") == 0) {
+			/* worker detected client disconnect */
+			restart = FALSE;
+		} else if (strcasecmp(response, "FINISHED") != 0) {
+			/* unknown response */
+			client_disconnect(client,
+				"Worker finished with unknown response");
+			return -1;
+		}
+
+		e_debug(client->event, "Worker finished successfully");
+
+		if (restart) {
+			/* connect to new worker for accessing different user */
+			client_worker_disconnect(client);
+			if (client_worker_connect(client) < 0) {
+				client_disconnect(client,
+					"Failed to connect to new worker");
+				return -1;
+			}
+
+			/* indicate success of "END" command */
+			client_send_line(client, "OK");
+		} else {
+			client_disconnect(client, "Client disconnected");
+		}
+		return -1;
+ 	default:
+		i_unreached();
+	}
+	return 0;
+}
+
+void client_worker_input(struct client *client)
+{
+	struct istream *input = client->ctrl_input;
+	const char *line;
+
+	if (input->closed) {
+		/* disconnected */
+		client_disconnect(client, "Worker disconnected unexpectedly");
+		return;
+	}
+
+	switch (i_stream_read(input)) {
+	case -1:
+		/* disconnected */
+		client_disconnect(client, "Worker disconnected unexpectedly");
+		return;
+	case -2:
+		/* input buffer full */
+		client_disconnect(client, "Worker sent too large input");
+		return;
+	}
+
+	while ((line = i_stream_next_line(input)) != NULL) {
+		if (client_worker_input_line(client, line) < 0)
+			return;
+	}
+}
+
+void client_destroy(struct client *client, const char *reason)
+{
+	i_assert(reason != NULL || client->disconnected);
+
+	if (!client->disconnected)
+		e_info(client->event, "Disconnected: %s", reason);
+
+	imap_urlauth_client_count--;
+	DLLIST_REMOVE(&imap_urlauth_clients, client);
+
+	timeout_remove(&client->to_idle);
+
+	client_worker_disconnect(client);
+	
+	o_stream_destroy(&client->output);
+
+	fd_close_maybe_stdio(&client->fd_in, &client->fd_out);
+
+	event_unref(&client->event);
+
+	i_free(client->username);
+	i_free(client->service);
+	array_free(&client->access_apps);
+	i_free(client);
+
+	master_service_client_connection_destroyed(master_service);
+	imap_urlauth_refresh_proctitle();
+}
+
+static void client_destroy_timeout(struct client *client)
+{
+	client_destroy(client, NULL);
+}
+
+void client_disconnect(struct client *client, const char *reason)
+{
+	if (client->disconnected)
+		return;
+
+	client->disconnected = TRUE;
+	e_info(client->event, "Disconnected: %s", reason);
+
+	client->to_idle = timeout_add(0, client_destroy_timeout, client);
+}
+
+void clients_destroy_all(void)
+{
+	while (imap_urlauth_clients != NULL)
+		client_destroy(imap_urlauth_clients, "Server shutting down.");
+}
diff --git a/src/imap-urlauth/imap-urlauth-client.h b/src/imap-urlauth/imap-urlauth-client.h
new file mode 100644
index 0000000..ada8407
--- /dev/null
+++ b/src/imap-urlauth/imap-urlauth-client.h
@@ -0,0 +1,49 @@
+#ifndef IMAP_URLAUTH_CLIENT_H
+#define IMAP_URLAUTH_CLIENT_H
+
+struct client;
+struct mail_storage;
+
+enum imap_urlauth_worker_state {
+	IMAP_URLAUTH_WORKER_STATE_INACTIVE = 0,
+	IMAP_URLAUTH_WORKER_STATE_CONNECTED,
+	IMAP_URLAUTH_WORKER_STATE_ACTIVE,
+};
+
+struct client {
+	struct client *prev, *next;
+
+	int fd_in, fd_out, fd_ctrl;
+	struct io *ctrl_io;
+	struct ostream *output, *ctrl_output;
+	struct istream *ctrl_input;
+	struct timeout *to_idle;
+	struct event *event;
+
+	char *username, *service;
+	ARRAY_TYPE(const_string) access_apps;
+
+	/* settings: */
+	const struct imap_urlauth_settings *set;
+
+	enum imap_urlauth_worker_state worker_state;
+
+	bool disconnected:1;
+};
+
+extern struct client *imap_urlauth_clients;
+extern unsigned int imap_urlauth_client_count;
+
+int client_create(const char *service, const char *username,
+		  int fd_in, int fd_out, const struct imap_urlauth_settings *set,
+		  struct client **client_r);
+void client_destroy(struct client *client, const char *reason);
+
+void client_send_line(struct client *client, const char *fmt, ...)
+	ATTR_FORMAT(2, 3);
+
+void client_disconnect(struct client *client, const char *reason);
+
+void clients_destroy_all(void);
+
+#endif
diff --git a/src/imap-urlauth/imap-urlauth-common.h b/src/imap-urlauth/imap-urlauth-common.h
new file mode 100644
index 0000000..ac6d06f
--- /dev/null
+++ b/src/imap-urlauth/imap-urlauth-common.h
@@ -0,0 +1,13 @@
+#ifndef IMAP_URLAUTH_COMMON_H
+#define IMAP_URLAUTH_COMMON_H
+
+#include "lib.h"
+#include "imap-urlauth-client.h"
+#include "imap-urlauth-settings.h"
+
+extern bool verbose_proctitle;
+extern struct mail_storage_service_ctx *storage_service;
+
+void imap_urlauth_refresh_proctitle(void);
+
+#endif
diff --git a/src/imap-urlauth/imap-urlauth-login-settings.c b/src/imap-urlauth/imap-urlauth-login-settings.c
new file mode 100644
index 0000000..3dc41f6
--- /dev/null
+++ b/src/imap-urlauth/imap-urlauth-login-settings.c
@@ -0,0 +1,75 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "buffer.h"
+#include "settings-parser.h"
+#include "service-settings.h"
+#include "login-settings.h"
+#include "imap-urlauth-login-settings.h"
+
+#include <stddef.h>
+
+/* <settings checks> */
+static struct file_listener_settings
+imap_urlauth_login_unix_listeners_array[] = {
+	{ "imap-urlauth", 0666, "", "" }
+};
+static struct file_listener_settings *imap_urlauth_login_unix_listeners[] = {
+	&imap_urlauth_login_unix_listeners_array[0]
+};
+static buffer_t imap_urlauth_login_unix_listeners_buf = {
+	{ { imap_urlauth_login_unix_listeners,
+	    sizeof(imap_urlauth_login_unix_listeners) } }
+};
+/* </settings checks> */
+
+struct service_settings imap_urlauth_login_service_settings = {
+	.name = "imap-urlauth-login",
+	.protocol = "imap",
+	.type = "login",
+	.executable = "imap-urlauth-login",
+	.user = "$default_login_user",
+	.group = "",
+	.privileged_group = "",
+	.extra_groups = "",
+	.chroot = "token-login",
+
+	.drop_priv_before_exec = FALSE,
+
+	.process_min_avail = 0,
+	.process_limit = 0,
+	.client_limit = 0,
+	.service_count = 1,
+	.idle_kill = 0,
+	.vsz_limit = UOFF_T_MAX,
+
+	.unix_listeners = { { &imap_urlauth_login_unix_listeners_buf,
+			      sizeof(imap_urlauth_login_unix_listeners[0]) } },
+	.fifo_listeners = ARRAY_INIT,
+	.inet_listeners = ARRAY_INIT
+};
+
+static const struct setting_define imap_urlauth_login_setting_defines[] = {
+	SETTING_DEFINE_LIST_END
+};
+
+static const struct setting_parser_info *imap_urlauth_login_setting_dependencies[] = {
+	&login_setting_parser_info,
+	NULL
+};
+
+const struct setting_parser_info imap_urlauth_login_setting_parser_info = {
+	.module_name = "imap-urlauth-login",
+	.defines = imap_urlauth_login_setting_defines,
+
+	.type_offset = SIZE_MAX,
+	.parent_offset = SIZE_MAX,
+
+	.dependencies = imap_urlauth_login_setting_dependencies
+};
+
+const struct setting_parser_info *imap_urlauth_login_setting_roots[] = {
+	&login_setting_parser_info,
+	&imap_urlauth_login_setting_parser_info,
+	NULL
+};
diff --git a/src/imap-urlauth/imap-urlauth-login-settings.h b/src/imap-urlauth/imap-urlauth-login-settings.h
new file mode 100644
index 0000000..775638a
--- /dev/null
+++ b/src/imap-urlauth/imap-urlauth-login-settings.h
@@ -0,0 +1,6 @@
+#ifndef IMAP_URLAUTH_LOGIN_SETTINGS_H
+#define IMAP_URLAUTH_LOGIN_SETTINGS_H
+
+extern const struct setting_parser_info *imap_urlauth_login_setting_roots[];
+
+#endif
diff --git a/src/imap-urlauth/imap-urlauth-login.c b/src/imap-urlauth/imap-urlauth-login.c
new file mode 100644
index 0000000..e917a5b
--- /dev/null
+++ b/src/imap-urlauth/imap-urlauth-login.c
@@ -0,0 +1,199 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "login-common.h"
+#include "str.h"
+#include "strescape.h"
+#include "base64.h"
+#include "net.h"
+#include "ioloop.h"
+#include "istream.h"
+#include "ostream.h"
+#include "master-service.h"
+#include "auth-client.h"
+#include "client-common.h"
+#include "imap-urlauth-login-settings.h"
+
+#define IMAP_URLAUTH_PROTOCOL_MAJOR_VERSION 2
+#define IMAP_URLAUTH_PROTOCOL_MINOR_VERSION 0
+
+struct imap_urlauth_client {
+	struct client common;
+
+	const struct imap_urlauth_login_settings *set;
+
+	bool version_received:1;
+};
+
+static void
+imap_urlauth_client_auth_result(struct client *client,
+				enum client_auth_result result,
+				const struct client_auth_reply *reply ATTR_UNUSED,
+				const char *text ATTR_UNUSED)
+{
+	if (result != CLIENT_AUTH_RESULT_SUCCESS) {
+		/* failed or otherwise invalid status */
+		client_send_raw(client, "FAILED\n");
+		client_destroy(client, "Authentication failed");
+	} else {
+		/* authentication succeeded */
+	}
+}
+
+static void imap_urlauth_client_handle_input(struct client *client)
+{
+#define AUTH_ARG_COUNT 6
+	struct imap_urlauth_client *uauth_client =
+		(struct imap_urlauth_client *)client;
+	struct net_unix_cred cred;
+	const char *line;
+	const char *const *args;
+	pid_t pid;
+
+	if (!uauth_client->version_received) {
+		if ((line = i_stream_next_line(client->input)) == NULL)
+			return;
+
+		if (!version_string_verify(line, "imap-urlauth",
+				IMAP_URLAUTH_PROTOCOL_MAJOR_VERSION)) {
+			e_error(client->event,
+				"IMAP URLAUTH client not compatible with this server "
+				"(mixed old and new binaries?) %s", line);
+			client_destroy(client, "Version mismatch");
+			return;
+		}
+		uauth_client->version_received = TRUE;
+	}
+
+	if ((line = i_stream_next_line(client->input)) == NULL)
+		return;
+
+	/* read authentication info from input;
+	   "AUTH"\t<service>\t<session-pid>\t<auth-username>\t<session_id>\t<token> */
+	args = t_strsplit_tabescaped(line);
+	if (str_array_length(args) < AUTH_ARG_COUNT ||
+	    strcmp(args[0], "AUTH") != 0 || str_to_pid(args[2], &pid) < 0) {
+		e_error(client->event,
+			"IMAP URLAUTH client sent unexpected AUTH input: %s", line);
+		client_destroy(client, "Unexpected input");
+		return;
+	}
+
+	/* only imap and submission have direct access to urlauth service */
+	if (strcmp(args[1], "imap") != 0 && strcmp(args[1], "submission") != 0) {
+		e_error(client->event,
+			"IMAP URLAUTH accessed from inappropriate service: %s", args[1]);
+		client_destroy(client, "Unexpected input");
+		return;
+	}
+
+	/* verify session pid if possible */
+	if (net_getunixcred(client->fd, &cred) == 0 &&
+	    cred.pid != (pid_t)-1 && pid != cred.pid) {
+		e_error(client->event,
+			"IMAP URLAUTH client sent invalid session pid %ld in AUTH request: "
+			"it did not match peer credentials (pid=%ld, uid=%ld)",
+			(long)pid, (long)cred.pid, (long)cred.uid);
+		client_destroy(client, "Invalid AUTH request");
+		return;
+	}
+
+	T_BEGIN {
+		string_t *auth_data = t_str_new(128);
+		string_t *init_resp;
+		unsigned int i;
+
+		str_append(auth_data, args[1]);
+		for (i = 2; i < AUTH_ARG_COUNT; i++) {
+			str_append_c(auth_data, '\0');
+			str_append(auth_data, args[i]);
+		}
+		init_resp = t_str_new(256);
+		base64_encode(str_data(auth_data),
+			      str_len(auth_data), init_resp);
+
+		(void)client_auth_begin_private(client, "DOVECOT-TOKEN",
+						str_c(init_resp));
+	} T_END;
+}
+
+static void imap_urlauth_client_input(struct client *client)
+{
+	if (!client_read(client))
+		return;
+
+	client_ref(client);
+	o_stream_cork(client->output);
+	if (!auth_client_is_connected(auth_client)) {
+		/* we're not currently connected to auth process -
+		   don't allow any commands */
+		timeout_remove(&client->to_auth_waiting);
+		client->input_blocked = TRUE;
+	} else {
+		imap_urlauth_client_handle_input(client);
+	}
+	o_stream_uncork(client->output);
+	client_unref(&client);
+}
+
+static struct client *imap_urlauth_client_alloc(pool_t pool)
+{
+	struct imap_urlauth_client *uauth_client;
+
+	uauth_client = p_new(pool, struct imap_urlauth_client, 1);
+	return &uauth_client->common;
+}
+
+static void imap_urlauth_client_create
+(struct client *client, void **other_sets)
+{
+	struct imap_urlauth_client *uauth_client =
+		(struct imap_urlauth_client *)client;
+
+	uauth_client->set = other_sets[0];
+	client->io = io_add_istream(client->input, client_input, client);
+}
+
+static void imap_urlauth_login_preinit(void)
+{
+	login_set_roots = imap_urlauth_login_setting_roots;
+}
+
+static void imap_urlauth_login_init(void)
+{
+}
+
+static void imap_urlauth_login_deinit(void)
+{
+	clients_destroy_all();
+}
+
+static struct client_vfuncs imap_urlauth_vfuncs = {
+	.alloc = imap_urlauth_client_alloc,
+	.create = imap_urlauth_client_create,
+	.input = imap_urlauth_client_input,
+	.auth_result = imap_urlauth_client_auth_result,
+	.send_raw_data = client_common_send_raw_data,
+	.free = client_common_default_free,
+};
+
+static struct login_binary imap_urlauth_login_binary = {
+	.protocol = "imap-urlauth",
+	.process_name = "imap-urlauth-login",
+	.default_login_socket = LOGIN_TOKEN_DEFAULT_SOCKET,
+
+	.event_category = {
+		.name = "imap",
+	},
+
+	.client_vfuncs = &imap_urlauth_vfuncs,
+	.preinit = imap_urlauth_login_preinit,
+	.init = imap_urlauth_login_init,
+	.deinit = imap_urlauth_login_deinit,
+
+	.anonymous_login_acceptable = TRUE,
+};
+
+int main(int argc, char *argv[])
+{
+	return login_binary_run(&imap_urlauth_login_binary, argc, argv);
+}
diff --git a/src/imap-urlauth/imap-urlauth-settings.c b/src/imap-urlauth/imap-urlauth-settings.c
new file mode 100644
index 0000000..73c3220
--- /dev/null
+++ b/src/imap-urlauth/imap-urlauth-settings.c
@@ -0,0 +1,94 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "buffer.h"
+#include "settings-parser.h"
+#include "service-settings.h"
+#include "imap-urlauth-settings.h"
+
+#include <stddef.h>
+#include <unistd.h>
+
+/* <settings checks> */
+static struct file_listener_settings imap_urlauth_unix_listeners_array[] = {
+	{ "token-login/imap-urlauth", 0666, "", "" }
+};
+static struct file_listener_settings *imap_urlauth_unix_listeners[] = {
+	&imap_urlauth_unix_listeners_array[0]
+};
+static buffer_t imap_urlauth_unix_listeners_buf = {
+	{ { imap_urlauth_unix_listeners, sizeof(imap_urlauth_unix_listeners) } }
+};
+/* </settings checks> */
+
+struct service_settings imap_urlauth_service_settings = {
+	.name = "imap-urlauth",
+	.protocol = "imap",
+	.type = "",
+	.executable = "imap-urlauth",
+	.user = "$default_internal_user",
+	.group = "",
+	.privileged_group = "",
+	.extra_groups = "",
+	.chroot = "",
+
+	.drop_priv_before_exec = FALSE,
+
+	.process_min_avail = 0,
+	.process_limit = 1024,
+	.client_limit = 1,
+	.service_count = 1,
+	.idle_kill = 0,
+	.vsz_limit = UOFF_T_MAX,
+
+	.unix_listeners = { { &imap_urlauth_unix_listeners_buf,
+			      sizeof(imap_urlauth_unix_listeners[0]) } },
+	.fifo_listeners = ARRAY_INIT,
+	.inet_listeners = ARRAY_INIT
+};
+
+#undef DEF
+#define DEF(type, name) \
+	SETTING_DEFINE_STRUCT_##type(#name, name, struct imap_urlauth_settings)
+
+static const struct setting_define imap_urlauth_setting_defines[] = {
+	DEF(STR, base_dir),
+
+	DEF(BOOL, mail_debug),
+
+	DEF(BOOL, verbose_proctitle),
+
+	DEF(STR, imap_urlauth_logout_format),
+	DEF(STR, imap_urlauth_submit_user),
+	DEF(STR, imap_urlauth_stream_user),
+
+	SETTING_DEFINE_LIST_END
+};
+
+const struct imap_urlauth_settings imap_urlauth_default_settings = {
+	.base_dir = PKG_RUNDIR,
+  .mail_debug = FALSE,
+
+	.verbose_proctitle = FALSE,
+
+	.imap_urlauth_logout_format = "in=%i out=%o",
+	.imap_urlauth_submit_user = NULL,
+	.imap_urlauth_stream_user = NULL
+};
+
+static const struct setting_parser_info *imap_urlauth_setting_dependencies[] = {
+	NULL
+};
+
+const struct setting_parser_info imap_urlauth_setting_parser_info = {
+	.module_name = "imap-urlauth",
+	.defines = imap_urlauth_setting_defines,
+	.defaults = &imap_urlauth_default_settings,
+
+	.type_offset = SIZE_MAX,
+	.struct_size = sizeof(struct imap_urlauth_settings),
+
+	.parent_offset = SIZE_MAX,
+
+	.dependencies = imap_urlauth_setting_dependencies
+};
diff --git a/src/imap-urlauth/imap-urlauth-settings.h b/src/imap-urlauth/imap-urlauth-settings.h
new file mode 100644
index 0000000..c04080e
--- /dev/null
+++ b/src/imap-urlauth/imap-urlauth-settings.h
@@ -0,0 +1,24 @@
+#ifndef IMAP_URLAUTH_SETTINGS_H
+#define IMAP_URLAUTH_SETTINGS_H
+
+struct mail_user_settings;
+
+struct imap_urlauth_settings {
+	const char *base_dir;
+
+	bool mail_debug;
+
+	bool verbose_proctitle;
+
+	/* imap_urlauth: */
+	const char *imap_urlauth_logout_format;
+
+	const char *imap_urlauth_submit_user;
+	const char *imap_urlauth_stream_user;
+};
+
+extern const struct imap_urlauth_settings imap_urlauth_default_settings;
+
+extern const struct setting_parser_info imap_urlauth_setting_parser_info;
+
+#endif
diff --git a/src/imap-urlauth/imap-urlauth-worker-settings.c b/src/imap-urlauth/imap-urlauth-worker-settings.c
new file mode 100644
index 0000000..a459aed
--- /dev/null
+++ b/src/imap-urlauth/imap-urlauth-worker-settings.c
@@ -0,0 +1,88 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "buffer.h"
+#include "settings-parser.h"
+#include "service-settings.h"
+#include "mail-storage-settings.h"
+#include "imap-urlauth-worker-settings.h"
+
+#include <stddef.h>
+#include <unistd.h>
+
+/* <settings checks> */
+static struct file_listener_settings imap_urlauth_worker_unix_listeners_array[] = {
+	{ "imap-urlauth-worker", 0600, "$default_internal_user", "" }
+};
+static struct file_listener_settings *imap_urlauth_worker_unix_listeners[] = {
+	&imap_urlauth_worker_unix_listeners_array[0]
+};
+static buffer_t imap_urlauth_worker_unix_listeners_buf = {
+	{ { imap_urlauth_worker_unix_listeners,
+	    sizeof(imap_urlauth_worker_unix_listeners) } }
+};
+/* </settings checks> */
+
+struct service_settings imap_urlauth_worker_service_settings = {
+	.name = "imap-urlauth-worker",
+	.protocol = "imap",
+	.type = "",
+	.executable = "imap-urlauth-worker",
+	.user = "",
+	.group = "",
+	.privileged_group = "",
+	.extra_groups = "$default_internal_group",
+	.chroot = "",
+
+	.drop_priv_before_exec = FALSE,
+
+	.process_min_avail = 0,
+	.process_limit = 1024,
+	.client_limit = 1,
+	.service_count = 1,
+	.idle_kill = 0,
+	.vsz_limit = UOFF_T_MAX,
+
+	.unix_listeners = { { &imap_urlauth_worker_unix_listeners_buf,
+			      sizeof(imap_urlauth_worker_unix_listeners[0]) } },
+	.fifo_listeners = ARRAY_INIT,
+	.inet_listeners = ARRAY_INIT
+};
+
+#undef DEF
+#define DEF(type, name) \
+	SETTING_DEFINE_STRUCT_##type(#name, name, struct imap_urlauth_worker_settings)
+
+static const struct setting_define imap_urlauth_worker_setting_defines[] = {
+	DEF(BOOL, verbose_proctitle),
+
+	DEF(STR, imap_urlauth_host),
+	DEF(IN_PORT, imap_urlauth_port),
+
+	SETTING_DEFINE_LIST_END
+};
+
+const struct imap_urlauth_worker_settings imap_urlauth_worker_default_settings = {
+	.verbose_proctitle = FALSE,
+
+	.imap_urlauth_host = "",
+	.imap_urlauth_port = 143
+};
+
+static const struct setting_parser_info *imap_urlauth_worker_setting_dependencies[] = {
+	&mail_user_setting_parser_info,
+	NULL
+};
+
+const struct setting_parser_info imap_urlauth_worker_setting_parser_info = {
+	.module_name = "imap-urlauth-worker",
+	.defines = imap_urlauth_worker_setting_defines,
+	.defaults = &imap_urlauth_worker_default_settings,
+
+	.type_offset = SIZE_MAX,
+	.struct_size = sizeof(struct imap_urlauth_worker_settings),
+
+	.parent_offset = SIZE_MAX,
+
+	.dependencies = imap_urlauth_worker_setting_dependencies
+};
diff --git a/src/imap-urlauth/imap-urlauth-worker-settings.h b/src/imap-urlauth/imap-urlauth-worker-settings.h
new file mode 100644
index 0000000..28154e8
--- /dev/null
+++ b/src/imap-urlauth/imap-urlauth-worker-settings.h
@@ -0,0 +1,18 @@
+#ifndef IMAP_URLAUTH_SETTINGS_H
+#define IMAP_URLAUTH_SETTINGS_H
+
+struct mail_user_settings;
+
+struct imap_urlauth_worker_settings {
+	bool verbose_proctitle;
+
+	/* imap_urlauth: */
+	const char *imap_urlauth_host;
+	in_port_t imap_urlauth_port;
+};
+
+extern const struct imap_urlauth_worker_settings imap_urlauth_worker_default_settings;
+
+extern const struct setting_parser_info imap_urlauth_worker_setting_parser_info;
+
+#endif
diff --git a/src/imap-urlauth/imap-urlauth-worker.c b/src/imap-urlauth/imap-urlauth-worker.c
new file mode 100644
index 0000000..4dc413a
--- /dev/null
+++ b/src/imap-urlauth/imap-urlauth-worker.c
@@ -0,0 +1,1033 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+#include "lib.h"
+#include "array.h"
+#include "ioloop.h"
+#include "net.h"
+#include "fdpass.h"
+#include "istream.h"
+#include "ostream.h"
+#include "str.h"
+#include "str-sanitize.h"
+#include "strescape.h"
+#include "llist.h"
+#include "hostpid.h"
+#include "var-expand.h"
+#include "process-title.h"
+#include "randgen.h"
+#include "restrict-access.h"
+#include "settings-parser.h"
+#include "master-service.h"
+#include "master-interface.h"
+#include "mail-storage.h"
+#include "mail-storage-service.h"
+#include "mail-namespace.h"
+#include "imap-url.h"
+#include "imap-msgpart-url.h"
+#include "imap-urlauth.h"
+#include "imap-urlauth-fetch.h"
+#include "imap-urlauth-worker-settings.h"
+
+#include <unistd.h>
+#include <sysexits.h>
+
+#define MAX_CTRL_HANDSHAKE 255
+
+/* max. length of input lines (URLs) */
+#define MAX_INBUF_SIZE 2048
+
+/* Disconnect client after idling this many milliseconds */
+#define CLIENT_IDLE_TIMEOUT_MSECS (10*60*1000)
+
+#define IS_STANDALONE() \
+        (getenv(MASTER_IS_PARENT_ENV) == NULL)
+
+#define IMAP_URLAUTH_WORKER_PROTOCOL_MAJOR_VERSION 2
+#define IMAP_URLAUTH_WORKER_PROTOCOL_MINOR_VERSION 0
+
+struct client {
+	struct client *prev, *next;
+
+	int fd_in, fd_out, fd_ctrl;
+
+	struct io *io, *ctrl_io;
+	struct istream *input, *ctrl_input;
+	struct ostream *output, *ctrl_output;
+	struct timeout *to_idle;
+
+	char *access_user, *access_service;
+	ARRAY_TYPE(string) access_apps;
+
+	struct mail_storage_service_user *service_user;
+	struct mail_user *mail_user;
+
+	struct imap_urlauth_context *urlauth_ctx;
+
+	struct imap_msgpart_url *url;
+	struct istream *msg_part_input;
+	uoff_t msg_part_size;
+
+	/* settings: */
+	const struct imap_urlauth_worker_settings *set;
+	const struct mail_storage_settings *mail_set;
+
+	bool debug:1;
+	bool finished:1;
+	bool waiting_input:1;
+	bool version_received:1;
+	bool access_received:1;
+	bool access_anonymous:1;
+};
+
+static bool verbose_proctitle = FALSE;
+static struct mail_storage_service_ctx *storage_service;
+
+struct client *imap_urlauth_worker_clients;
+unsigned int imap_urlauth_worker_client_count;
+
+static void client_destroy(struct client *client);
+static void client_abort(struct client *client, const char *reason);
+static int client_run_url(struct client *client);
+static void client_input(struct client *client);
+static bool client_handle_input(struct client *client);
+static int client_output(struct client *client);
+
+static void client_ctrl_input(struct client *client);
+
+static void imap_urlauth_worker_refresh_proctitle(void)
+{
+	struct client *client = imap_urlauth_worker_clients;
+	string_t *title;
+
+	if (!verbose_proctitle)
+		return;
+
+	title = t_str_new(128);
+	str_append_c(title, '[');
+	switch (imap_urlauth_worker_client_count) {
+	case 0:
+		str_append(title, "idling");
+		break;
+	case 1:
+		if (client->mail_user == NULL)
+			str_append(title, client->access_user);
+		else {
+			str_append(title, client->access_user);
+			str_append(title, "->");
+			str_append(title, client->mail_user->username);
+		}
+		break;
+	default:
+		str_printfa(title, "%u connections",
+			    imap_urlauth_worker_client_count);
+		break;
+	}
+	str_append_c(title, ']');
+	process_title_set(str_c(title));
+}
+
+static void client_idle_timeout(struct client *client)
+{
+	if (client->url != NULL) {
+		client_abort(client,
+			"Session closed for inactivity in reading our output");
+	} else {
+		client_destroy(client);
+	}
+}
+
+static struct client *client_create(int fd)
+{
+	struct client *client;
+
+	/* always use nonblocking I/O */
+	net_set_nonblock(fd, TRUE);
+
+	client = i_new(struct client, 1);
+	i_array_init(&client->access_apps, 16);
+	client->fd_in = -1;
+	client->fd_out = -1;
+	client->fd_ctrl = fd;
+	client->access_anonymous = TRUE; /* default until overridden */
+
+	client->ctrl_io = io_add(fd, IO_READ, client_ctrl_input, client);
+	client->to_idle = timeout_add(CLIENT_IDLE_TIMEOUT_MSECS,
+				      client_idle_timeout, client);
+
+	imap_urlauth_worker_client_count++;
+	DLLIST_PREPEND(&imap_urlauth_worker_clients, client);
+
+	imap_urlauth_worker_refresh_proctitle();
+	return client;
+}
+
+static struct client *
+client_create_standalone(const char *access_user,
+			 const char *const *access_applications,
+			 int fd_in, int fd_out, bool debug)
+{
+	struct client *client;
+
+	/* always use nonblocking I/O */
+	net_set_nonblock(fd_in, TRUE);
+	net_set_nonblock(fd_out, TRUE);
+
+	client = i_new(struct client, 1);
+	i_array_init(&client->access_apps, 16);
+	client->fd_in = fd_in;
+	client->fd_out = fd_out;
+	client->fd_ctrl = -1;
+
+	if (access_user != NULL && *access_user != '\0')
+		client->access_user = i_strdup(access_user);
+	else {
+		client->access_user = i_strdup("anonymous");
+		client->access_anonymous = TRUE;
+	}
+	if (access_applications != NULL) {
+		const char *const *apps = access_applications;
+		for (; *apps != NULL; apps++) {
+			char *app = i_strdup(*apps);
+			array_push_back(&client->access_apps, &app);
+		}
+	}
+	client->debug = debug;
+
+	client->input = i_stream_create_fd(fd_in, MAX_INBUF_SIZE);
+	client->output = o_stream_create_fd(fd_out, SIZE_MAX);
+	client->io = io_add(fd_in, IO_READ, client_input, client);
+	client->to_idle = timeout_add(CLIENT_IDLE_TIMEOUT_MSECS,
+				      client_idle_timeout, client);
+	o_stream_set_no_error_handling(client->output, TRUE);
+	o_stream_set_flush_callback(client->output, client_output, client);
+
+	imap_urlauth_worker_client_count++;
+	DLLIST_PREPEND(&imap_urlauth_worker_clients, client);
+
+	i_set_failure_prefix("imap-urlauth[%s](%s): ",
+			     my_pid, client->access_user);
+	return client;
+}
+
+static void client_abort(struct client *client, const char *reason)
+{
+	i_error("%s", reason);
+	client_destroy(client);
+}
+
+static void client_destroy(struct client *client)
+{
+	char *app;
+
+	i_set_failure_prefix("imap-urlauth[%s](%s): ",
+			     my_pid, client->access_user);
+
+	if (client->url != NULL) {
+		/* deinitialize url */
+		i_stream_close(client->input);
+		o_stream_close(client->output);
+		(void)client_run_url(client);
+		i_assert(client->url == NULL);
+	}
+
+	imap_urlauth_worker_client_count--;
+	DLLIST_REMOVE(&imap_urlauth_worker_clients, client);
+
+	if (client->urlauth_ctx != NULL)
+		imap_urlauth_deinit(&client->urlauth_ctx);
+
+	if (client->mail_user != NULL)
+		mail_user_deinit(&client->mail_user);
+
+	io_remove(&client->io);
+	io_remove(&client->ctrl_io);
+	timeout_remove(&client->to_idle);
+
+	i_stream_destroy(&client->input);
+	o_stream_destroy(&client->output);
+
+	i_stream_destroy(&client->ctrl_input);
+	o_stream_destroy(&client->ctrl_output);
+
+	fd_close_maybe_stdio(&client->fd_in, &client->fd_out);
+	if (client->fd_ctrl >= 0)
+		net_disconnect(client->fd_ctrl);
+
+	if (client->service_user != NULL)
+		mail_storage_service_user_unref(&client->service_user);
+	i_free(client->access_user);
+	i_free(client->access_service);
+	array_foreach_elem(&client->access_apps, app)
+		i_free(app);
+	array_free(&client->access_apps);
+	i_free(client);
+
+	imap_urlauth_worker_refresh_proctitle();
+	master_service_client_connection_destroyed(master_service);
+}
+
+static int client_run_url(struct client *client)
+{
+	const unsigned char *data;
+	size_t size;
+	ssize_t ret = 0;
+
+	while (i_stream_read_more(client->msg_part_input, &data, &size) > 0) {
+		if ((ret = o_stream_send(client->output, data, size)) < 0)
+			break;
+		i_stream_skip(client->msg_part_input, ret);
+
+		if (o_stream_get_buffer_used_size(client->output) >= 4096) {
+			if ((ret = o_stream_flush(client->output)) < 0)
+				break;
+			if (ret == 0)
+				return 0;
+		}
+	}
+
+	if (client->output->closed || ret < 0) {
+		imap_msgpart_url_free(&client->url);
+		return -1;
+	}
+
+	if (client->msg_part_input->eof) {
+		o_stream_nsend(client->output, "\n", 1);
+		imap_msgpart_url_free(&client->url);
+		return 1;
+	}
+	return 0;
+}
+
+static void clients_destroy_all(void)
+{
+	while (imap_urlauth_worker_clients != NULL)
+		client_destroy(imap_urlauth_worker_clients);
+}
+
+static void ATTR_FORMAT(2, 3)
+client_send_line(struct client *client, const char *fmt, ...)
+{
+	va_list va;
+
+	if (client->output->closed)
+		return;
+
+	va_start(va, fmt);
+
+	T_BEGIN {
+		string_t *str;
+
+		str = t_str_new(256);
+		str_vprintfa(str, fmt, va);
+		str_append(str, "\n");
+
+		o_stream_nsend(client->output, str_data(str), str_len(str));
+	} T_END;
+
+	va_end(va);
+}
+
+static int
+client_fetch_urlpart(struct client *client, const char *url,
+		     enum imap_urlauth_fetch_flags url_flags,
+		     const char **bpstruct_r, bool *binary_with_nuls_r,
+		     const char **errormsg_r)
+{
+	const char *error;
+	struct imap_msgpart_open_result mpresult;
+	enum mail_error error_code;
+	int ret;
+
+	*bpstruct_r = NULL;
+	*errormsg_r = NULL;
+	*binary_with_nuls_r = FALSE;
+
+	ret = imap_urlauth_fetch(client->urlauth_ctx, url,
+				 &client->url, &error_code, &error);
+	if (ret <= 0) {
+		if (ret < 0)
+			return -1;
+		error = t_strdup_printf("Failed to fetch URLAUTH \"%s\": %s",
+					url, error);
+		if (client->debug)
+			i_debug("%s", error);
+		/* don't leak info about existence/accessibility
+		   of mailboxes */
+		if (error_code == MAIL_ERROR_PARAMS)
+			*errormsg_r = error;
+		return 0;
+	}
+
+	if ((url_flags & IMAP_URLAUTH_FETCH_FLAG_BINARY) != 0)
+		imap_msgpart_url_set_decode_to_binary(client->url);
+	if ((url_flags & IMAP_URLAUTH_FETCH_FLAG_BODYPARTSTRUCTURE) != 0) {
+		ret = imap_msgpart_url_get_bodypartstructure(client->url,
+							     bpstruct_r, &error);
+		if (ret <= 0) {
+			*errormsg_r = t_strdup_printf(
+				"Failed to read URLAUTH \"%s\": %s", url, error);
+			if (client->debug)
+				i_debug("%s", *errormsg_r);
+			return ret;
+		}
+	}
+
+	/* if requested, read the message part the URL points to */
+	if ((url_flags & IMAP_URLAUTH_FETCH_FLAG_BODY) != 0 ||
+	    (url_flags & IMAP_URLAUTH_FETCH_FLAG_BINARY) != 0) {
+		ret = imap_msgpart_url_read_part(client->url, &mpresult, &error);
+		if (ret <= 0) {
+			*errormsg_r = t_strdup_printf(
+				"Failed to read URLAUTH \"%s\": %s", url, error);
+			if (client->debug)
+				i_debug("%s", *errormsg_r);
+			return ret;
+		}
+		client->msg_part_size = mpresult.size;
+		client->msg_part_input = mpresult.input;
+		*binary_with_nuls_r = mpresult.binary_decoded_input_has_nuls;
+	}
+	return 1;
+}
+
+static int client_fetch_url(struct client *client, const char *url,
+			    enum imap_urlauth_fetch_flags url_flags)
+{
+	string_t *response;
+	const char *bpstruct, *errormsg;
+	bool binary_with_nuls;
+	int ret;
+
+	i_assert(client->url == NULL);
+
+	client->msg_part_size = 0;
+	client->msg_part_input = NULL;
+
+	if (client->debug)
+		i_debug("Fetching URLAUTH %s", url);
+
+	/* fetch URL */
+	ret = client_fetch_urlpart(client, url, url_flags, &bpstruct,
+				   &binary_with_nuls, &errormsg);
+	if (ret <= 0) {
+		/* fetch failed */
+		if (client->url != NULL)
+			imap_msgpart_url_free(&client->url);
+		/* don't send error details to anonymous users: just to be sure
+		   that no information about the target user account is unduly
+		   leaked. */
+		if (client->access_anonymous || errormsg == NULL)
+			client_send_line(client, "NO");
+		else {
+			client_send_line(client, "NO\terror=%s",
+					 str_tabescape(errormsg));
+		}
+		if (ret < 0) {
+			/* fetch failed badly */
+			client_abort(client, "Session aborted: Fatal failure while fetching URL");
+		}
+		return 0;
+	}
+
+	response = t_str_new(256);
+	str_append(response, "OK");
+	if (binary_with_nuls)
+		str_append(response, "\thasnuls");
+	if (bpstruct != NULL) {
+		str_append(response, "\tbpstruct=");
+		str_append(response, str_tabescape(bpstruct));
+		if (client->debug) {
+			i_debug("Fetched URLAUTH yielded BODYPARTSTRUCTURE (%s)",
+				bpstruct);
+		}
+	}
+
+	/* return content */
+	o_stream_cork(client->output);
+	if (client->msg_part_size == 0 || client->msg_part_input == NULL) {
+		/* empty */
+		str_append(response, "\t0");
+		client_send_line(client, "%s", str_c(response));
+
+		imap_msgpart_url_free(&client->url);
+		client->url = NULL;
+		if (client->debug)
+			i_debug("Fetched URLAUTH yielded empty result");
+	} else {
+
+		/* actual content */
+		str_printfa(response, "\t%"PRIuUOFF_T, client->msg_part_size);
+		client_send_line(client, "%s", str_c(response));
+
+		if (client->debug) {
+			i_debug("Fetched URLAUTH yielded %"PRIuUOFF_T" bytes "
+				"of %smessage data", client->msg_part_size,
+				(binary_with_nuls ? "binary " : ""));
+		}
+		if (client_run_url(client) < 0) {
+			client_abort(client,
+				"Session aborted: Fatal failure while transferring URL");
+			return 0;
+		}		
+	}
+
+	if (client->url != NULL) {
+		/* URL not finished */
+		o_stream_set_flush_pending(client->output, TRUE);
+		client->waiting_input = TRUE;
+	}
+	o_stream_uncork(client->output);
+	return client->url != NULL ? 0 : 1;
+}
+
+static int
+client_handle_command(struct client *client, const char *cmd,
+		      const char *const *args, const char **error_r)
+{
+	int ret;
+
+	*error_r = NULL;
+
+	/* "URL"["\tbody"]["\tbinary"]["\tbpstruct"]"\t"<url>:
+	   fetch URL (meta)data */
+	if (strcmp(cmd, "URL") == 0) {
+		enum imap_urlauth_fetch_flags url_flags = 0;
+		const char *url;
+
+		if (*args == NULL) {
+			*error_r = "URL: Missing URL parameter";
+			return -1;
+		}
+
+		url = *args;
+	
+		args++;
+		while (*args != NULL) {
+			if (strcasecmp(*args, "body") == 0)
+				url_flags |= IMAP_URLAUTH_FETCH_FLAG_BODY;
+			else if (strcasecmp(*args, "binary") == 0)
+				url_flags |= IMAP_URLAUTH_FETCH_FLAG_BINARY;
+			else if (strcasecmp(*args, "bpstruct") == 0)
+				url_flags |= IMAP_URLAUTH_FETCH_FLAG_BODYPARTSTRUCTURE;
+
+			args++;
+		}
+
+		if (url_flags == 0)
+			url_flags = IMAP_URLAUTH_FETCH_FLAG_BODY;
+
+		T_BEGIN {
+			ret = client_fetch_url(client, url, url_flags);
+		} T_END;
+		return ret;
+	}
+
+	/* "END": unselect current user (closes worker) */
+	if (strcmp(cmd, "END") == 0) {
+		if (args[0] != NULL) {
+			*error_r = "END: Invalid number of parameters";
+			return -1;
+		}
+
+		client->finished = TRUE;
+		if (client->ctrl_output != NULL)
+			o_stream_nsend_str(client->ctrl_output, "FINISHED\n");
+		client_destroy(client);
+		return 0;
+	}
+
+	*error_r = t_strconcat("Unknown or inappropriate command: ", cmd, NULL);
+	return -1;
+}
+
+static int
+client_handle_user_command(struct client *client, const char *cmd,
+			   const char *const *args, const char **error_r)
+{
+	struct mail_storage_service_input input;
+	struct imap_urlauth_worker_settings *set;
+	struct mail_storage_service_user *user;
+	struct imap_urlauth_config config;
+	struct mail_user *mail_user;
+	const char *error;
+	unsigned int count;
+	int ret;
+
+	/* "USER\t"<username> */
+	*error_r = NULL;
+
+	/* check command syntax */
+	if (strcmp(cmd, "USER") != 0) {
+		*error_r = t_strconcat("Unknown or inappropriate command: ",
+				       cmd, NULL);
+		return -1;
+	}
+
+	if (args[0] == NULL || args[1] != NULL) {
+		*error_r = "USER: Invalid number of parameters";
+		return -1;
+	}
+
+	/* lookup user */
+	i_zero(&input);
+	input.module = "imap-urlauth-worker";
+	input.service = "imap-urlauth-worker";
+	input.username = args[0];
+
+	if (client->debug)
+		i_debug("Looking up user %s", input.username);
+
+	ret = mail_storage_service_lookup_next(storage_service, &input,
+					       &user, &mail_user, &error);
+	if (ret < 0) {
+		i_error("Failed to lookup user %s: %s", input.username, error);
+		client_abort(client, "Session aborted: Failed to lookup user");
+		return 0;
+	} else if (ret == 0) {
+		if (client->debug)
+			i_debug("User %s doesn't exist", input.username);
+
+		client_send_line(client, "NO");
+		return 1;
+	}
+
+	client->debug = mail_user->mail_debug =
+		client->debug || mail_user->mail_debug;
+
+	/* drop privileges */
+	restrict_access_allow_coredumps(TRUE);
+
+	set = mail_storage_service_user_get_set(user)[1];
+	if (settings_var_expand(&imap_urlauth_worker_setting_parser_info, set,
+				mail_user->pool,
+				mail_user_var_expand_table(mail_user),
+				&error) <= 0) {
+		client_send_line(client, "NO");
+		client_abort(client, t_strdup_printf(
+			"Session aborted: Failed to expand settings: %s", error));
+		return 0;
+	}
+
+	if (set->verbose_proctitle) {
+		verbose_proctitle = TRUE;
+		imap_urlauth_worker_refresh_proctitle();
+	}
+
+	client->service_user = user;
+	client->mail_user = mail_user;
+	client->set = set;
+
+	if (client->debug) {
+		i_debug("Found user account `%s' on behalf of user `%s'",
+			mail_user->username, client->access_user);
+	}
+
+	/* initialize urlauth context */
+	if (*set->imap_urlauth_host == '\0') {
+		i_error("imap_urlauth_host setting is not configured for user %s",
+			mail_user->username);
+		client_send_line(client, "NO");
+		client_abort(client, "Session aborted: URLAUTH not configured");
+		return 0;
+	}
+
+	i_zero(&config);
+	config.url_host = set->imap_urlauth_host;
+	config.url_port = set->imap_urlauth_port;
+	config.access_user = client->access_user;
+	config.access_service = client->access_service;
+	config.access_anonymous = client->access_anonymous;
+	config.access_applications =
+		(const void *)array_get(&client->access_apps, &count);
+		
+	client->urlauth_ctx = imap_urlauth_init(client->mail_user, &config);
+	if (client->debug) {
+		i_debug("Providing access to user account `%s' on behalf of user `%s' "
+			"using service `%s'", mail_user->username, client->access_user,
+			client->access_service);
+	}
+
+	i_set_failure_prefix("imap-urlauth[%s](%s->%s): ",
+			     my_pid, client->access_user, mail_user->username);
+
+	client_send_line(client, "OK");
+	return 1;
+}
+
+static bool client_handle_input(struct client *client)
+{
+	const char *line, *cmd, *error;
+	int ret;
+
+	if (client->url != NULL) {
+		/* we're still processing a URL. wait until it's
+		   finished. */
+		io_remove(&client->io);
+		client->io = NULL;
+		client->waiting_input = TRUE;
+		return TRUE;
+	}
+
+	if (client->io == NULL) {
+		client->io = io_add(client->fd_in, IO_READ,
+				    client_input, client);
+	}
+	client->waiting_input = FALSE;
+	timeout_reset(client->to_idle);
+
+	switch (i_stream_read(client->input)) {
+	case -1:
+		/* disconnected */
+		if (client->ctrl_output != NULL)
+			o_stream_nsend_str(client->ctrl_output, "DISCONNECTED\n");
+		client_destroy(client);
+		return FALSE;
+	case -2:
+		/* line too long, kill it */
+		client_abort(client, "Session aborted: Input line too long");
+		return FALSE;
+	}
+
+	while ((line = i_stream_next_line(client->input)) != NULL) {
+		const char *const *args = t_strsplit_tabescaped(line);
+
+		if (args[0] == NULL)
+			continue;
+		cmd = args[0]; args++;
+
+		if (client->mail_user == NULL)
+			ret = client_handle_user_command(client, cmd, args, &error);
+		else
+			ret = client_handle_command(client, cmd, args, &error);
+
+		if (ret <= 0) {
+			if (ret == 0)
+				break;
+			i_error("Client input error: %s", error);
+			client_abort(client, "Session aborted: Unexpected input");
+			return FALSE;
+		}
+	}
+	return TRUE;
+}
+
+static void client_input(struct client *client)
+{
+	(void)client_handle_input(client);
+}
+
+static int client_output(struct client *client)
+{
+	if (o_stream_flush(client->output) < 0) {
+		if (client->ctrl_output != NULL)
+			o_stream_nsend_str(client->ctrl_output, "DISCONNECTED\n");
+		client_destroy(client);
+		return 1;
+	}
+	timeout_reset(client->to_idle);
+
+	if (client->url != NULL) {
+		if (client_run_url(client) < 0) {
+			client_destroy(client);
+			return 1;
+		}
+
+		if (client->url == NULL && client->waiting_input) {
+			if (!client_handle_input(client)) {
+				/* client got destroyed */
+				return 1;
+			}
+		}
+	}
+
+	if (client->url != NULL) {
+		/* url not finished yet */
+		return 0;
+	} else if (client->io == NULL) {
+		/* data still in output buffer, get back here to add IO */
+		return 0;
+	} else {
+		return 1;
+	}
+}
+
+static int
+client_ctrl_read_fds(struct client *client)
+{
+	unsigned char data = 0;
+	ssize_t ret = 1;
+
+	if (client->fd_in == -1) {
+		ret = fd_read(client->fd_ctrl, &data,
+			      sizeof(data), &client->fd_in);
+		if (ret > 0 && data == '0')
+			client->fd_out = client->fd_in;
+	}
+	if (ret > 0 && client->fd_out == -1) {
+		ret = fd_read(client->fd_ctrl, &data,
+			      sizeof(data), &client->fd_out);
+	}
+
+	if (ret == 0) {
+		/* unexpectedly disconnected */
+		client_destroy(client);
+		return 0;
+	} else if (ret < 0) {
+		if (errno == EAGAIN)
+			return 0;
+		i_error("fd_read() failed: %m");
+		return -1;
+	} else if (data != '0') {
+		i_error("fd_read() returned invalid byte 0x%2x", data);
+		return -1;
+	}
+
+	if (client->fd_in == -1 || client->fd_out == -1) {
+		i_error("Handshake is missing a file descriptor");
+		return -1;
+	}
+
+	client->ctrl_input =
+		i_stream_create_fd(client->fd_ctrl, MAX_INBUF_SIZE);
+	client->ctrl_output = o_stream_create_fd(client->fd_ctrl, SIZE_MAX);
+	o_stream_set_no_error_handling(client->ctrl_output, TRUE);
+	return 1;
+}
+
+static void client_ctrl_input(struct client *client)
+{
+	const char *const *args;
+	const char *line;
+	int ret;
+
+	timeout_reset(client->to_idle);
+
+	if (client->fd_in == -1 || client->fd_out == -1) {
+		if ((ret = client_ctrl_read_fds(client)) <= 0) {
+			if (ret < 0)
+				client_abort(client, "FD Transfer failed");
+			return;
+		}
+	}
+
+	switch (i_stream_read(client->ctrl_input)) {
+	case -1:
+		/* disconnected */
+		client_destroy(client);
+		return;
+	case -2:
+		/* line too long, kill it */
+		client_abort(client,
+			     "Control session aborted: Input line too long");
+		return;
+	}
+
+	if (!client->version_received) {
+		if ((line = i_stream_next_line(client->ctrl_input)) == NULL)
+			return;
+
+		if (!version_string_verify(line, "imap-urlauth-worker",
+				IMAP_URLAUTH_WORKER_PROTOCOL_MAJOR_VERSION)) {
+			i_error("imap-urlauth-worker client not compatible with this server "
+				"(mixed old and new binaries?) %s", line);
+			client_abort(client, "Control session aborted: Version mismatch");
+			return;
+		}
+
+		client->version_received = TRUE;
+		if (o_stream_send_str(client->ctrl_output, "OK\n") < 0) {
+			client_destroy(client);
+			return;
+		}
+	}
+
+	if (client->access_received) {
+		client_abort(client, "Control session aborted: Unexpected input");
+		return;
+	}
+
+	if ((line = i_stream_next_line(client->ctrl_input)) == NULL)
+		return;
+
+	args = t_strsplit_tabescaped(line);
+	if (*args == NULL || strcmp(*args, "ACCESS") != 0) {
+		i_error("Invalid control command: %s", str_sanitize(line, 80));
+		client_abort(client, "Control session aborted: Invalid command");
+		return;
+	}
+	args++;
+	if (args[0] == NULL || args[1] == NULL) {
+		i_error("Invalid ACCESS command: %s", str_sanitize(line, 80));
+		client_abort(client, "Control session aborted: Invalid command");
+		return;
+	}
+
+	i_assert(client->access_user == NULL);
+	i_assert(client->access_service == NULL);
+	if (**args != '\0') {
+		client->access_user = i_strdup(*args);
+		client->access_anonymous = FALSE;
+	} else {
+		client->access_user = i_strdup("anonymous");
+		client->access_anonymous = TRUE;
+	}
+	args++;
+	client->access_service = i_strdup(*args);
+
+	i_set_failure_prefix("imap-urlauth[%s](%s): ",
+			     my_pid, client->access_user);
+
+	args++;
+	while (*args != NULL) {
+		/* debug */
+		if (strcasecmp(*args, "debug") == 0) {
+			client->debug = TRUE;
+		/* apps=<access-application>[,<access-application,...] */
+		} else if (strncasecmp(*args, "apps=", 5) == 0 &&
+			   (*args)[5] != '\0') {
+			const char *const *apps = t_strsplit(*args+5, ",");
+
+			while (*apps != NULL) {
+				char *app = i_strdup(*apps);
+
+				array_push_back(&client->access_apps, &app);
+				if (client->debug) {
+					i_debug("User %s has URLAUTH %s access",
+						client->access_user, app);
+				}
+				apps++;
+			}
+		} else {
+			i_error("Invalid ACCESS parameter: %s", str_sanitize(*args, 80));
+			client_abort(client, "Control session aborted: Invalid command");
+			return;
+		} 
+		args++;
+	}
+
+	client->access_received = TRUE;
+
+	if (o_stream_send_str(client->ctrl_output, "OK\n") < 0) {
+		client_destroy(client);
+		return;
+	}
+
+	client->input = i_stream_create_fd(client->fd_in, MAX_INBUF_SIZE);
+	client->output = o_stream_create_fd(client->fd_out, SIZE_MAX);
+	client->io = io_add(client->fd_in, IO_READ, client_input, client);
+	o_stream_set_no_error_handling(client->output, TRUE);
+	o_stream_set_flush_callback(client->output, client_output, client);
+
+	if (client->debug) {
+		i_debug("Worker activated for access by user `%s' using service `%s'",
+			client->access_user, client->access_service);
+	}
+}
+
+static void imap_urlauth_worker_die(void)
+{
+	/* do nothing */
+}
+
+static void main_stdio_run(const char *access_user,
+			   const char *const *access_applications)
+{
+	bool debug;
+
+	debug = getenv("DEBUG") != NULL;
+	access_user = access_user != NULL ? access_user : getenv("USER");
+	if (access_user == NULL && IS_STANDALONE())
+		access_user = getlogin();
+	if (access_user == NULL)
+		i_fatal("USER environment missing");
+
+	(void)client_create_standalone(access_user, access_applications,
+				       STDIN_FILENO, STDOUT_FILENO, debug);
+}
+
+static void client_connected(struct master_service_connection *conn)
+{
+	master_service_client_connection_accept(conn);
+	(void)client_create(conn->fd);
+}
+
+int main(int argc, char *argv[])
+{
+	static const struct setting_parser_info *set_roots[] = {
+		&imap_urlauth_worker_setting_parser_info,
+		NULL
+	};
+	enum master_service_flags service_flags = 0;
+	enum mail_storage_service_flags storage_service_flags =
+		MAIL_STORAGE_SERVICE_FLAG_USERDB_LOOKUP |
+		MAIL_STORAGE_SERVICE_FLAG_NO_LOG_INIT;
+	ARRAY_TYPE (const_string) access_apps;
+	const char *access_user = NULL;
+	int c;
+
+	if (IS_STANDALONE()) {
+		service_flags |= MASTER_SERVICE_FLAG_STANDALONE |
+			MASTER_SERVICE_FLAG_STD_CLIENT;
+	} else {
+		service_flags |= MASTER_SERVICE_FLAG_KEEP_CONFIG_OPEN;
+	}
+
+	master_service = master_service_init("imap-urlauth-worker", service_flags,
+					     &argc, &argv, "a:");
+
+	t_array_init(&access_apps, 4);
+	while ((c = master_getopt(master_service)) > 0) {
+		switch (c) {
+		case 'a': {
+			const char *app = t_strdup(optarg);
+
+			array_push_back(&access_apps, &app);
+			break;
+		}
+		default:
+			return FATAL_DEFAULT;
+		}
+	}
+
+	if ( optind < argc ) {
+		access_user = argv[optind++];
+	}
+
+	if (optind != argc) {
+		i_fatal_status(EX_USAGE, "Unknown argument: %s", argv[optind]);
+	}
+
+	master_service_init_log_with_pid(master_service);
+	master_service_set_die_callback(master_service, imap_urlauth_worker_die);
+
+	storage_service =
+		mail_storage_service_init(master_service,
+					  set_roots, storage_service_flags);
+	master_service_init_finish(master_service);
+
+	/* fake that we're running, so we know if client was destroyed
+	   while handling its initial input */
+	io_loop_set_running(current_ioloop);
+
+	if (IS_STANDALONE()) {
+		T_BEGIN {
+			if (array_count(&access_apps) > 0) {
+				(void)array_append_space(&access_apps);
+				main_stdio_run(access_user,
+					       array_front(&access_apps));
+			} else {
+				main_stdio_run(access_user, NULL);
+			}
+		} T_END;
+	} else {
+		io_loop_set_running(current_ioloop);
+	}
+
+	if (io_loop_is_running(current_ioloop))
+		master_service_run(master_service, client_connected);
+	clients_destroy_all();
+
+	mail_storage_service_deinit(&storage_service);
+	master_service_deinit(&master_service);
+	return 0;
+}
diff --git a/src/imap-urlauth/imap-urlauth.c b/src/imap-urlauth/imap-urlauth.c
new file mode 100644
index 0000000..e7cb7d2
--- /dev/null
+++ b/src/imap-urlauth/imap-urlauth.c
@@ -0,0 +1,288 @@
+/* Copyright (c) 2013-2018 Dovecot authors, see the included COPYING file */
+
+/*
+The imap-urlauth service provides URLAUTH access between different accounts. If
+user A has an URLAUTH that references a mail from user B, it makes a connection
+to the imap-urlauth service to access user B's mail store to retrieve the
+mail.
+
+The authentication and authorization of the URLAUTH is performed within
+this service. Because access to the mailbox and the associated mailbox keys is
+necessary to retrieve the message and for verification of the URLAUTH, the
+urlauth services need root privileges. To mitigate security concerns, the
+retrieval and verification of the URLs is performed in a worker service that
+drops root privileges and acts as target user B.
+
+The imap-urlauth service thus consists of three separate stages:
+
+- imap-urlauth-login:
+  This is the login service which operates identical to imap-login and
+  pop3-login equivalents, except for the fact that only token authentication is
+  allowed. It verifies that the connecting client is an IMAP service acting on
+  behaf of an authenticated user.
+
+- imap-urlauth:
+  Once the client is authenticated, the connection gets passed to the
+  imap-urlauth service (as implemented here). The goal of this stage is 
+  to prevent the need for re-authenticating to the imap-urlauth service when
+  the clients wants to switch to a different target user. It normally runs as
+  $default_internal_user and starts workers to perform the actual work. To start
+  a worker, the imap-urlauth service establishes a control connection to the
+  imap-urlauth-worker service. In the handshake phase of the control protocol,
+  the connection of the client is passed to the worker. Once the worker
+  finishes, a new worker is started and the client connection is transfered to
+  it, unless the client is disconnected.
+
+- imap-urlauth-worker:
+  The worker handles the URLAUTH requests from the client, so this is where the
+  mail store of the target user is accessed. The worker starts as root. In the
+  protocol interaction the client first indicates what the target user is.
+  The worker then performs a userdb lookup and drops privileges. The client can
+  then submit URLAUTH requests, which are limited to that user. Once the client
+  wants to access a different user, the worker terminates and the imap-urlauth
+  service starts a new worker for the next target user.
+*/
+
+#include "imap-urlauth-common.h"
+#include "lib-signals.h"
+#include "ioloop.h"
+#include "buffer.h"
+#include "array.h"
+#include "istream.h"
+#include "ostream.h"
+#include "path-util.h"
+#include "base64.h"
+#include "str.h"
+#include "process-title.h"
+#include "auth-master.h"
+#include "master-service.h"
+#include "master-service-settings.h"
+#include "master-login.h"
+#include "master-interface.h"
+#include "var-expand.h"
+
+#include <stdio.h>
+#include <unistd.h>
+
+#define IS_STANDALONE() \
+        (getenv(MASTER_IS_PARENT_ENV) == NULL)
+
+bool verbose_proctitle = FALSE;
+static struct master_login *master_login = NULL;
+
+static const struct imap_urlauth_settings *imap_urlauth_settings;
+
+void imap_urlauth_refresh_proctitle(void)
+{
+	struct client *client;
+	string_t *title = t_str_new(128);
+
+	if (!verbose_proctitle)
+		return;
+
+	str_append_c(title, '[');
+	switch (imap_urlauth_client_count) {
+	case 0:
+		str_append(title, "idling");
+		break;
+	case 1:
+		client = imap_urlauth_clients;
+		str_append(title, client->username);
+		break;
+	default:
+		str_printfa(title, "%u connections", imap_urlauth_client_count);
+		break;
+	}
+	str_append_c(title, ']');
+	process_title_set(str_c(title));
+}
+
+static void imap_urlauth_die(void)
+{
+	/* do nothing. imap_urlauth connections typically die pretty quick anyway. */
+}
+
+static int
+client_create_from_input(const char *service, const char *username,
+		int fd_in, int fd_out)
+{
+	struct client *client;
+
+	if (client_create(service, username, fd_in, fd_out,
+			  imap_urlauth_settings, &client) < 0)
+		return -1;
+
+	if (!IS_STANDALONE())
+		client_send_line(client, "OK");
+	return 0;
+}
+
+static void main_stdio_run(const char *username)
+{
+	username = username != NULL ? username : getenv("USER");
+	if (username == NULL && IS_STANDALONE())
+		username = getlogin();
+	if (username == NULL)
+		i_fatal("USER environment missing");
+
+	(void)client_create_from_input("", username, STDIN_FILENO, STDOUT_FILENO);
+}
+
+static void
+login_client_connected(const struct master_login_client *client,
+		       const char *username, const char *const *extra_fields)
+{
+	const char *msg = "NO\n";
+	struct auth_user_reply reply;
+	struct net_unix_cred cred;
+	const char *const *fields;
+	const char *service = NULL;
+	unsigned int count, i;
+
+	auth_user_fields_parse(extra_fields, pool_datastack_create(), &reply);
+
+	/* check peer credentials if possible */
+	if (reply.uid != (uid_t)-1 && net_getunixcred(client->fd, &cred) == 0 &&
+		reply.uid != cred.uid) {
+		i_error("Peer's credentials (uid=%ld) do not match "
+			"the user that logged in (uid=%ld).",
+			(long)cred.uid, (long)reply.uid);
+		if (write(client->fd, msg, strlen(msg)) < 0) {
+			/* ignored */
+		}
+		net_disconnect(client->fd);
+		return;
+	}
+
+	fields = array_get(&reply.extra_fields, &count);
+	for (i = 0; i < count; i++) {
+		if (str_begins(fields[i], "client_service=")) {
+			service = fields[i] + 15;
+			break;
+		}
+	}
+
+	if (service == NULL) {
+		i_error("Auth did not yield required client_service field (BUG).");
+		if (write(client->fd, msg, strlen(msg)) < 0) {
+			/* ignored */
+		}
+		net_disconnect(client->fd);
+		return;
+	}
+
+	if (reply.anonymous)
+		username = NULL;
+
+	if (client_create_from_input(service, username, client->fd, client->fd) < 0)
+		net_disconnect(client->fd);
+}
+
+static void login_client_failed(const struct master_login_client *client,
+				const char *errormsg ATTR_UNUSED)
+{
+	const char *msg = "NO\n";
+	if (write(client->fd, msg, strlen(msg)) < 0) {
+		/* ignored */
+	}
+}
+
+static void client_connected(struct master_service_connection *conn)
+{
+	/* when running standalone, we shouldn't even get here */
+	i_assert(master_login != NULL);
+
+	master_service_client_connection_accept(conn);
+	master_login_add(master_login, conn->fd);
+}
+
+int main(int argc, char *argv[])
+{
+	static const struct setting_parser_info *set_roots[] = {
+		&imap_urlauth_setting_parser_info,
+		NULL
+	};
+	struct master_login_settings login_set;
+	struct master_service_settings_input input;
+	struct master_service_settings_output output;
+	void **sets;
+	enum master_service_flags service_flags = 0;
+	const char *error = NULL, *username = NULL;
+	const char *auth_socket_path = "auth-master";
+	int c;
+
+	i_zero(&login_set);
+	login_set.postlogin_timeout_secs = MASTER_POSTLOGIN_TIMEOUT_DEFAULT;
+
+	if (IS_STANDALONE() && getuid() == 0 &&
+	    net_getpeername(1, NULL, NULL) == 0) {
+		printf("NO imap_urlauth binary must not be started from "
+		       "inetd, use imap-urlauth-login instead.\n");
+		return 1;
+	}
+
+	if (IS_STANDALONE()) {
+		service_flags |= MASTER_SERVICE_FLAG_STANDALONE |
+			MASTER_SERVICE_FLAG_STD_CLIENT;
+	} else {
+		service_flags |= MASTER_SERVICE_FLAG_KEEP_CONFIG_OPEN;
+	}
+
+	master_service = master_service_init("imap-urlauth", service_flags,
+					     &argc, &argv, "a:");
+	while ((c = master_getopt(master_service)) > 0) {
+		switch (c) {
+		case 'a':
+			auth_socket_path = optarg;
+			break;
+		default:
+			return FATAL_DEFAULT;
+		}
+	}
+	master_service_init_log(master_service);
+
+	i_zero(&input);
+	input.roots = set_roots;
+	input.module = "imap-urlauth";
+	input.service = "imap-urlauth";
+	if (master_service_settings_read(master_service, &input, &output,
+						&error) < 0)
+		i_fatal("Error reading configuration: %s", error);
+
+	sets = master_service_settings_get_others(master_service);
+	imap_urlauth_settings = sets[0];	
+
+	if (imap_urlauth_settings->verbose_proctitle)
+		verbose_proctitle = TRUE;
+
+	if (t_abspath(auth_socket_path, &login_set.auth_socket_path, &error) < 0) {
+		i_fatal("t_abspath(%s) failed: %s", auth_socket_path, error);
+	}
+	login_set.callback = login_client_connected;
+	login_set.failure_callback = login_client_failed;
+
+	master_service_init_finish(master_service);
+	master_service_set_die_callback(master_service, imap_urlauth_die);
+
+	/* fake that we're running, so we know if client was destroyed
+	   while handling its initial input */
+	io_loop_set_running(current_ioloop);
+
+	if (IS_STANDALONE()) {
+		T_BEGIN {
+			main_stdio_run(username);
+		} T_END;
+	} else {
+		master_login = master_login_init(master_service, &login_set);
+		io_loop_set_running(current_ioloop);
+	}
+
+	if (io_loop_is_running(current_ioloop))
+		master_service_run(master_service, client_connected);
+	clients_destroy_all();
+
+	if (master_login != NULL)
+		master_login_deinit(&master_login);
+	master_service_deinit(&master_service);
+	return 0;
+}