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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:22:51 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-07 14:22:51 +0000
commit9ada0093e92388590c7368600ca4e9e3e376f0d0 (patch)
treea56fe41110023676d7082028cbaa47ca4b6e6164 /modules/pam_exec
parentInitial commit. (diff)
downloadpam-upstream.tar.xz
pam-upstream.zip
Adding upstream version 1.5.2.upstream/1.5.2upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'modules/pam_exec')
-rw-r--r--modules/pam_exec/Makefile.am33
-rw-r--r--modules/pam_exec/Makefile.in1150
-rw-r--r--modules/pam_exec/README79
-rw-r--r--modules/pam_exec/README.xml41
-rw-r--r--modules/pam_exec/pam_exec.8188
-rw-r--r--modules/pam_exec/pam_exec.8.xml319
-rw-r--r--modules/pam_exec/pam_exec.c522
-rwxr-xr-xmodules/pam_exec/tst-pam_exec2
8 files changed, 2334 insertions, 0 deletions
diff --git a/modules/pam_exec/Makefile.am b/modules/pam_exec/Makefile.am
new file mode 100644
index 0000000..713de6a
--- /dev/null
+++ b/modules/pam_exec/Makefile.am
@@ -0,0 +1,33 @@
+#
+# Copyright (c) 2006, 2009 Thorsten Kukuk <kukuk@suse.de>
+#
+
+CLEANFILES = *~
+MAINTAINERCLEANFILES = $(MANS) README
+
+EXTRA_DIST = $(XMLS)
+
+if HAVE_DOC
+dist_man_MANS = pam_exec.8
+endif
+XMLS = README.xml pam_exec.8.xml
+dist_check_SCRIPTS = tst-pam_exec
+TESTS = $(dist_check_SCRIPTS)
+
+securelibdir = $(SECUREDIR)
+secureconfdir = $(SCONFIGDIR)
+
+AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include \
+ $(WARN_CFLAGS)
+AM_LDFLAGS = -no-undefined -avoid-version -module
+if HAVE_VERSIONING
+ AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map
+endif
+
+securelib_LTLIBRARIES = pam_exec.la
+pam_exec_la_LIBADD = $(top_builddir)/libpam/libpam.la
+
+if ENABLE_REGENERATE_MAN
+dist_noinst_DATA = README
+-include $(top_srcdir)/Make.xml.rules
+endif
diff --git a/modules/pam_exec/Makefile.in b/modules/pam_exec/Makefile.in
new file mode 100644
index 0000000..a312387
--- /dev/null
+++ b/modules/pam_exec/Makefile.in
@@ -0,0 +1,1150 @@
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+@am__EXEEXT_TRUE@ "$$tst" $(AM_TESTS_FD_REDIRECT)
+
+distdir: $(BUILT_SOURCES)
+ $(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+ @srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+ topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+ list='$(DISTFILES)'; \
+ dist_files=`for file in $$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 $$file; then d=.; else d=$(srcdir); fi; \
+ if test -d $$d/$$file; then \
+ dir=`echo "/$$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)/$$file" \
+ || exit 1; \
+ fi; \
+ done
+check-am: all-am
+ $(MAKE) $(AM_MAKEFLAGS) $(dist_check_SCRIPTS)
+ $(MAKE) $(AM_MAKEFLAGS) check-TESTS
+check: check-am
+all-am: Makefile $(LTLIBRARIES) $(MANS) $(DATA)
+installdirs:
+ for dir in "$(DESTDIR)$(securelibdir)" "$(DESTDIR)$(man8dir)"; do \
+ test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+ done
+install: install-am
+install-exec: install-exec-am
+install-data: install-data-am
+uninstall: uninstall-am
+
+install-am: all-am
+ @$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-am
+install-strip:
+ if test -z '$(STRIP)'; then \
+ $(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:
+ -test -z "$(TEST_LOGS)" || rm -f $(TEST_LOGS)
+ -test -z "$(TEST_LOGS:.log=.trs)" || rm -f $(TEST_LOGS:.log=.trs)
+ -test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
+
+clean-generic:
+ -test -z "$(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 $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+ @echo "This command is intended for maintainers to use"
+ @echo "it deletes files that may require special tools to rebuild."
+ -test -z "$(MAINTAINERCLEANFILES)" || rm -f $(MAINTAINERCLEANFILES)
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-securelibLTLIBRARIES \
+ mostlyclean-am
+
+distclean: distclean-am
+ -rm -f ./$(DEPDIR)/pam_exec.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-man install-securelibLTLIBRARIES
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+install-dvi: install-dvi-am
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+install-dvi-am:
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+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
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+install-info: install-info-am
+
+install-info-am:
+
+install-man: install-man8
+
+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_exec.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-man uninstall-securelibLTLIBRARIES
+
+uninstall-man: uninstall-man8
+
+.MAKE: check-am install-am install-strip
+
+.PHONY: CTAGS GTAGS TAGS all all-am am--depfiles check check-TESTS \
+ check-am clean clean-generic clean-libtool \
+ clean-securelibLTLIBRARIES 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-info \
+ install-info-am install-man install-man8 install-pdf \
+ install-pdf-am install-ps install-ps-am \
+ install-securelibLTLIBRARIES install-strip installcheck \
+ installcheck-am installdirs maintainer-clean \
+ maintainer-clean-generic mostlyclean mostlyclean-compile \
+ mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+ recheck tags tags-am uninstall uninstall-am uninstall-man \
+ uninstall-man8 uninstall-securelibLTLIBRARIES
+
+.PRECIOUS: Makefile
+
+@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules
+
+# 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/modules/pam_exec/README b/modules/pam_exec/README
new file mode 100644
index 0000000..3959162
--- /dev/null
+++ b/modules/pam_exec/README
@@ -0,0 +1,79 @@
+pam_exec — PAM module which calls an external command
+
+━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+
+DESCRIPTION
+
+pam_exec is a PAM module that can be used to run an external command.
+
+The child's environment is set to the current PAM environment list, as returned
+by pam_getenvlist(3) In addition, the following PAM items are exported as
+environment variables: PAM_RHOST, PAM_RUSER, PAM_SERVICE, PAM_TTY, PAM_USER and
+PAM_TYPE, which contains one of the module types: account, auth, password,
+open_session and close_session.
+
+Commands called by pam_exec need to be aware of that the user can have control
+over the environment.
+
+OPTIONS
+
+debug
+
+ Print debug information.
+
+expose_authtok
+
+ During authentication the calling command can read the password from stdin
+ (3). Only first PAM_MAX_RESP_SIZE bytes of a password are provided to the
+ command.
+
+log=file
+
+ The output of the command is appended to file
+
+type=type
+
+ Only run the command if the module type matches the given type.
+
+stdout
+
+ Per default the output of the executed command is written to /dev/null.
+ With this option, the stdout output of the executed command is redirected
+ to the calling application. It's in the responsibility of this application
+ what happens with the output. The log option is ignored.
+
+quiet
+
+ Per default pam_exec.so will echo the exit status of the external command
+ if it fails. Specifying this option will suppress the message.
+
+quiet_log
+
+ Per default pam_exec.so will log the exit status of the external command if
+ it fails. Specifying this option will suppress the log message.
+
+seteuid
+
+ Per default pam_exec.so will execute the external command with the real
+ user ID of the calling process. Specifying this option means the command is
+ run with the effective user ID.
+
+EXAMPLES
+
+Add the following line to /etc/pam.d/passwd to rebuild the NIS database after
+each local password change:
+
+ password optional pam_exec.so seteuid /usr/bin/make -C /var/yp
+
+
+This will execute the command
+
+make -C /var/yp
+
+with effective user ID.
+
+AUTHOR
+
+pam_exec was written by Thorsten Kukuk <kukuk@thkukuk.de> and Josh Triplett
+<josh@joshtriplett.org>.
+
diff --git a/modules/pam_exec/README.xml b/modules/pam_exec/README.xml
new file mode 100644
index 0000000..5e76cab
--- /dev/null
+++ b/modules/pam_exec/README.xml
@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding='UTF-8'?>
+<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
+"http://www.docbook.org/xml/4.3/docbookx.dtd"
+[
+<!--
+<!ENTITY pamaccess SYSTEM "pam_exec.8.xml">
+-->
+]>
+
+<article>
+
+ <articleinfo>
+
+ <title>
+ <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+ href="pam_exec.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_exec-name"]/*)'/>
+ </title>
+
+ </articleinfo>
+
+ <section>
+ <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+ href="pam_exec.8.xml" xpointer='xpointer(//refsect1[@id = "pam_exec-description"]/*)'/>
+ </section>
+
+ <section>
+ <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+ href="pam_exec.8.xml" xpointer='xpointer(//refsect1[@id = "pam_exec-options"]/*)'/>
+ </section>
+
+ <section>
+ <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+ href="pam_exec.8.xml" xpointer='xpointer(//refsect1[@id = "pam_exec-examples"]/*)'/>
+ </section>
+
+ <section>
+ <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+ href="pam_exec.8.xml" xpointer='xpointer(//refsect1[@id = "pam_exec-author"]/*)'/>
+ </section>
+
+</article>
diff --git a/modules/pam_exec/pam_exec.8 b/modules/pam_exec/pam_exec.8
new file mode 100644
index 0000000..7108791
--- /dev/null
+++ b/modules/pam_exec/pam_exec.8
@@ -0,0 +1,188 @@
+'\" t
+.\" Title: pam_exec
+.\" Author: [see the "AUTHOR" section]
+.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
+.\" Date: 09/03/2021
+.\" Manual: Linux-PAM Manual
+.\" Source: Linux-PAM Manual
+.\" Language: English
+.\"
+.TH "PAM_EXEC" "8" "09/03/2021" "Linux-PAM Manual" "Linux\-PAM Manual"
+.\" -----------------------------------------------------------------
+.\" * Define some portability stuff
+.\" -----------------------------------------------------------------
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.\" http://bugs.debian.org/507673
+.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.ie \n(.g .ds Aq \(aq
+.el .ds Aq '
+.\" -----------------------------------------------------------------
+.\" * set default formatting
+.\" -----------------------------------------------------------------
+.\" disable hyphenation
+.nh
+.\" disable justification (adjust text to left margin only)
+.ad l
+.\" -----------------------------------------------------------------
+.\" * MAIN CONTENT STARTS HERE *
+.\" -----------------------------------------------------------------
+.SH "NAME"
+pam_exec \- PAM module which calls an external command
+.SH "SYNOPSIS"
+.HP \w'\fBpam_exec\&.so\fR\ 'u
+\fBpam_exec\&.so\fR [debug] [expose_authtok] [seteuid] [quiet] [quiet_log] [stdout] [log=\fIfile\fR] [type=\fItype\fR] \fIcommand\fR [\fI\&.\&.\&.\fR]
+.SH "DESCRIPTION"
+.PP
+pam_exec is a PAM module that can be used to run an external command\&.
+.PP
+The child\*(Aqs environment is set to the current PAM environment list, as returned by
+\fBpam_getenvlist\fR(3)
+In addition, the following PAM items are exported as environment variables:
+\fIPAM_RHOST\fR,
+\fIPAM_RUSER\fR,
+\fIPAM_SERVICE\fR,
+\fIPAM_TTY\fR,
+\fIPAM_USER\fR
+and
+\fIPAM_TYPE\fR, which contains one of the module types:
+\fBaccount\fR,
+\fBauth\fR,
+\fBpassword\fR,
+\fBopen_session\fR
+and
+\fBclose_session\fR\&.
+.PP
+Commands called by pam_exec need to be aware of that the user can have control over the environment\&.
+.SH "OPTIONS"
+.PP
+.PP
+\fBdebug\fR
+.RS 4
+Print debug information\&.
+.RE
+.PP
+\fBexpose_authtok\fR
+.RS 4
+During authentication the calling command can read the password from
+\fBstdin\fR(3)\&. Only first
+\fIPAM_MAX_RESP_SIZE\fR
+bytes of a password are provided to the command\&.
+.RE
+.PP
+\fBlog=\fR\fB\fIfile\fR\fR
+.RS 4
+The output of the command is appended to
+file
+.RE
+.PP
+\fBtype=\fR\fB\fItype\fR\fR
+.RS 4
+Only run the command if the module type matches the given type\&.
+.RE
+.PP
+\fBstdout\fR
+.RS 4
+Per default the output of the executed command is written to
+/dev/null\&. With this option, the stdout output of the executed command is redirected to the calling application\&. It\*(Aqs in the responsibility of this application what happens with the output\&. The
+\fBlog\fR
+option is ignored\&.
+.RE
+.PP
+\fBquiet\fR
+.RS 4
+Per default pam_exec\&.so will echo the exit status of the external command if it fails\&. Specifying this option will suppress the message\&.
+.RE
+.PP
+\fBquiet_log\fR
+.RS 4
+Per default pam_exec\&.so will log the exit status of the external command if it fails\&. Specifying this option will suppress the log message\&.
+.RE
+.PP
+\fBseteuid\fR
+.RS 4
+Per default pam_exec\&.so will execute the external command with the real user ID of the calling process\&. Specifying this option means the command is run with the effective user ID\&.
+.RE
+.SH "MODULE TYPES PROVIDED"
+.PP
+All module types (\fBauth\fR,
+\fBaccount\fR,
+\fBpassword\fR
+and
+\fBsession\fR) are provided\&.
+.SH "RETURN VALUES"
+.PP
+.PP
+PAM_SUCCESS
+.RS 4
+The external command was run successfully\&.
+.RE
+.PP
+PAM_BUF_ERR
+.RS 4
+Memory buffer error\&.
+.RE
+.PP
+PAM_CONV_ERR
+.RS 4
+The conversation method supplied by the application failed to obtain the username\&.
+.RE
+.PP
+PAM_INCOMPLETE
+.RS 4
+The conversation method supplied by the application returned PAM_CONV_AGAIN\&.
+.RE
+.PP
+PAM_SERVICE_ERR
+.RS 4
+No argument or a wrong number of arguments were given\&.
+.RE
+.PP
+PAM_SYSTEM_ERR
+.RS 4
+A system error occurred or the command to execute failed\&.
+.RE
+.PP
+PAM_IGNORE
+.RS 4
+\fBpam_setcred\fR
+was called, which does not execute the command\&. Or, the value given for the type= parameter did not match the module type\&.
+.RE
+.SH "EXAMPLES"
+.PP
+Add the following line to
+/etc/pam\&.d/passwd
+to rebuild the NIS database after each local password change:
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+ password optional pam_exec\&.so seteuid /usr/bin/make \-C /var/yp
+
+.fi
+.if n \{\
+.RE
+.\}
+.sp
+This will execute the command
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+make \-C /var/yp
+.fi
+.if n \{\
+.RE
+.\}
+.sp
+with effective user ID\&.
+.SH "SEE ALSO"
+.PP
+\fBpam.conf\fR(5),
+\fBpam.d\fR(5),
+\fBpam\fR(8)
+.SH "AUTHOR"
+.PP
+pam_exec was written by Thorsten Kukuk <kukuk@thkukuk\&.de> and Josh Triplett <josh@joshtriplett\&.org>\&.
diff --git a/modules/pam_exec/pam_exec.8.xml b/modules/pam_exec/pam_exec.8.xml
new file mode 100644
index 0000000..7e89943
--- /dev/null
+++ b/modules/pam_exec/pam_exec.8.xml
@@ -0,0 +1,319 @@
+<?xml version="1.0" encoding='UTF-8'?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
+ "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd">
+
+<refentry id="pam_exec">
+
+ <refmeta>
+ <refentrytitle>pam_exec</refentrytitle>
+ <manvolnum>8</manvolnum>
+ <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo>
+ </refmeta>
+
+ <refnamediv id="pam_exec-name">
+ <refname>pam_exec</refname>
+ <refpurpose>PAM module which calls an external command</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <cmdsynopsis id="pam_exec-cmdsynopsis">
+ <command>pam_exec.so</command>
+ <arg choice="opt">
+ debug
+ </arg>
+ <arg choice="opt">
+ expose_authtok
+ </arg>
+ <arg choice="opt">
+ seteuid
+ </arg>
+ <arg choice="opt">
+ quiet
+ </arg>
+ <arg choice="opt">
+ quiet_log
+ </arg>
+ <arg choice="opt">
+ stdout
+ </arg>
+ <arg choice="opt">
+ log=<replaceable>file</replaceable>
+ </arg>
+ <arg choice="opt">
+ type=<replaceable>type</replaceable>
+ </arg>
+ <arg choice="plain">
+ <replaceable>command</replaceable>
+ </arg>
+ <arg choice="opt">
+ <replaceable>...</replaceable>
+ </arg>
+ </cmdsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1 id="pam_exec-description">
+
+ <title>DESCRIPTION</title>
+
+ <para>
+ pam_exec is a PAM module that can be used to run
+ an external command.
+ </para>
+
+ <para>
+ The child's environment is set to the current PAM environment list, as
+ returned by
+ <citerefentry>
+ <refentrytitle>pam_getenvlist</refentrytitle><manvolnum>3</manvolnum>
+ </citerefentry>
+ In addition, the following PAM items are
+ exported as environment variables: <emphasis>PAM_RHOST</emphasis>,
+ <emphasis>PAM_RUSER</emphasis>, <emphasis>PAM_SERVICE</emphasis>,
+ <emphasis>PAM_TTY</emphasis>, <emphasis>PAM_USER</emphasis> and
+ <emphasis>PAM_TYPE</emphasis>, which contains one of the module
+ types: <option>account</option>, <option>auth</option>,
+ <option>password</option>, <option>open_session</option> and
+ <option>close_session</option>.
+ </para>
+
+ <para>
+ Commands called by pam_exec need to be aware of that the user
+ can have control over the environment.
+ </para>
+
+ </refsect1>
+
+ <refsect1 id="pam_exec-options">
+
+ <title>OPTIONS</title>
+ <para>
+ <variablelist>
+
+ <varlistentry>
+ <term>
+ <option>debug</option>
+ </term>
+ <listitem>
+ <para>
+ Print debug information.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>
+ <option>expose_authtok</option>
+ </term>
+ <listitem>
+ <para>
+ During authentication the calling command can read
+ the password from <citerefentry>
+ <refentrytitle>stdin</refentrytitle><manvolnum>3</manvolnum>
+ </citerefentry>. Only first <emphasis>PAM_MAX_RESP_SIZE</emphasis>
+ bytes of a password are provided to the command.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>
+ <option>log=<replaceable>file</replaceable></option>
+ </term>
+ <listitem>
+ <para>
+ The output of the command is appended to
+ <filename>file</filename>
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>
+ <option>type=<replaceable>type</replaceable></option>
+ </term>
+ <listitem>
+ <para>
+ Only run the command if the module type matches the given type.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>
+ <option>stdout</option>
+ </term>
+ <listitem>
+ <para>
+ Per default the output of the executed command is written to <filename>/dev/null</filename>. With this option, the stdout output of the executed command is redirected to the calling application. It's in the responsibility of this application what happens with the output. The <option>log</option> option is ignored.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>
+ <option>quiet</option>
+ </term>
+ <listitem>
+ <para>
+ Per default pam_exec.so will echo the exit status of the
+ external command if it fails.
+ Specifying this option will suppress the message.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>
+ <option>quiet_log</option>
+ </term>
+ <listitem>
+ <para>
+ Per default pam_exec.so will log the exit status of the
+ external command if it fails.
+ Specifying this option will suppress the log message.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>
+ <option>seteuid</option>
+ </term>
+ <listitem>
+ <para>
+ Per default pam_exec.so will execute the external command
+ with the real user ID of the calling process.
+ Specifying this option means the command is run
+ with the effective user ID.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ </variablelist>
+
+ </para>
+ </refsect1>
+
+ <refsect1 id="pam_exec-types">
+ <title>MODULE TYPES PROVIDED</title>
+ <para>
+ All module types (<option>auth</option>, <option>account</option>,
+ <option>password</option> and <option>session</option>) are provided.
+ </para>
+ </refsect1>
+
+ <refsect1 id='pam_exec-return_values'>
+ <title>RETURN VALUES</title>
+ <para>
+ <variablelist>
+
+ <varlistentry>
+ <term>PAM_SUCCESS</term>
+ <listitem>
+ <para>
+ The external command was run successfully.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>PAM_BUF_ERR</term>
+ <listitem>
+ <para>
+ Memory buffer error.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>PAM_CONV_ERR</term>
+ <listitem>
+ <para>
+ The conversation method supplied by the application
+ failed to obtain the username.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>PAM_INCOMPLETE</term>
+ <listitem>
+ <para>
+ The conversation method supplied by the application
+ returned PAM_CONV_AGAIN.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>PAM_SERVICE_ERR</term>
+ <listitem>
+ <para>
+ No argument or a wrong number of arguments were given.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>PAM_SYSTEM_ERR</term>
+ <listitem>
+ <para>
+ A system error occurred or the command to execute failed.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>PAM_IGNORE</term>
+ <listitem>
+ <para>
+ <function>pam_setcred</function> was called, which
+ does not execute the command. Or, the value given for the type=
+ parameter did not match the module type.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ </variablelist>
+ </para>
+ </refsect1>
+
+ <refsect1 id='pam_exec-examples'>
+ <title>EXAMPLES</title>
+ <para>
+ Add the following line to <filename>/etc/pam.d/passwd</filename> to
+ rebuild the NIS database after each local password change:
+ <programlisting>
+ password optional pam_exec.so seteuid /usr/bin/make -C /var/yp
+ </programlisting>
+
+ This will execute the command
+ <programlisting>make -C /var/yp</programlisting>
+ with effective user ID.
+ </para>
+ </refsect1>
+
+ <refsect1 id='pam_exec-see_also'>
+ <title>SEE ALSO</title>
+ <para>
+ <citerefentry>
+ <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum>
+ </citerefentry>
+ </para>
+ </refsect1>
+
+ <refsect1 id='pam_exec-author'>
+ <title>AUTHOR</title>
+ <para>
+ pam_exec was written by Thorsten Kukuk &lt;kukuk@thkukuk.de&gt; and
+ Josh Triplett &lt;josh@joshtriplett.org&gt;.
+ </para>
+ </refsect1>
+
+</refentry>
diff --git a/modules/pam_exec/pam_exec.c b/modules/pam_exec/pam_exec.c
new file mode 100644
index 0000000..05dec16
--- /dev/null
+++ b/modules/pam_exec/pam_exec.c
@@ -0,0 +1,522 @@
+/*
+ * Copyright (c) 2006, 2008 Thorsten Kukuk <kukuk@thkukuk.de>
+ *
+ * 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.
+ */
+
+#if defined(HAVE_CONFIG_H)
+#include "config.h"
+#endif
+
+#include <time.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <string.h>
+#include <syslog.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include <security/pam_modules.h>
+#include <security/pam_modutil.h>
+#include <security/pam_ext.h>
+#include <security/_pam_macros.h>
+#include "pam_inline.h"
+
+#define ENV_ITEM(n) { (n), #n }
+static struct {
+ int item;
+ const char *name;
+} env_items[] = {
+ ENV_ITEM(PAM_SERVICE),
+ ENV_ITEM(PAM_USER),
+ ENV_ITEM(PAM_TTY),
+ ENV_ITEM(PAM_RHOST),
+ ENV_ITEM(PAM_RUSER),
+};
+
+/* move_fd_to_non_stdio copies the given file descriptor to something other
+ * than stdin, stdout, or stderr. Assumes that the caller will close all
+ * unwanted fds after calling. */
+static int
+move_fd_to_non_stdio (pam_handle_t *pamh, int fd)
+{
+ while (fd < 3)
+ {
+ fd = dup(fd);
+ if (fd == -1)
+ {
+ int err = errno;
+ pam_syslog (pamh, LOG_ERR, "dup failed: %m");
+ _exit (err);
+ }
+ }
+ return fd;
+}
+
+static int
+call_exec (const char *pam_type, pam_handle_t *pamh,
+ int argc, const char **argv)
+{
+ int debug = 0;
+ int call_setuid = 0;
+ int quiet = 0;
+ int quiet_log = 0;
+ int expose_authtok = 0;
+ int use_stdout = 0;
+ int optargc;
+ const char *logfile = NULL;
+ char authtok[PAM_MAX_RESP_SIZE] = {};
+ pid_t pid;
+ int fds[2];
+ int stdout_fds[2];
+ FILE *stdout_file = NULL;
+ int retval;
+ const char *name;
+
+ if (argc < 1) {
+ pam_syslog (pamh, LOG_ERR,
+ "This module needs at least one argument");
+ return PAM_SERVICE_ERR;
+ }
+
+ for (optargc = 0; optargc < argc; optargc++)
+ {
+ const char *str;
+
+ if (argv[optargc][0] == '/') /* paths starts with / */
+ break;
+
+ if (strcasecmp (argv[optargc], "debug") == 0)
+ debug = 1;
+ else if (strcasecmp (argv[optargc], "stdout") == 0)
+ use_stdout = 1;
+ else if ((str = pam_str_skip_icase_prefix (argv[optargc], "log=")) != NULL)
+ logfile = str;
+ else if ((str = pam_str_skip_icase_prefix (argv[optargc], "type=")) != NULL)
+ {
+ if (strcmp (pam_type, str) != 0)
+ return PAM_IGNORE;
+ }
+ else if (strcasecmp (argv[optargc], "seteuid") == 0)
+ call_setuid = 1;
+ else if (strcasecmp (argv[optargc], "quiet") == 0)
+ quiet = 1;
+ else if (strcasecmp (argv[optargc], "quiet_log") == 0)
+ quiet_log = 1;
+ else if (strcasecmp (argv[optargc], "expose_authtok") == 0)
+ expose_authtok = 1;
+ else
+ break; /* Unknown option, assume program to execute. */
+ }
+
+ /* Request user name to be available. */
+
+ retval = pam_get_user(pamh, &name, NULL);
+ if (retval != PAM_SUCCESS)
+ {
+ if (retval == PAM_CONV_AGAIN)
+ retval = PAM_INCOMPLETE;
+ return retval;
+ }
+
+ if (expose_authtok == 1)
+ {
+ if (strcmp (pam_type, "auth") != 0)
+ {
+ pam_syslog (pamh, LOG_ERR,
+ "expose_authtok not supported for type %s", pam_type);
+ expose_authtok = 0;
+ }
+ else
+ {
+ const void *void_pass;
+
+ retval = pam_get_item (pamh, PAM_AUTHTOK, &void_pass);
+ if (retval != PAM_SUCCESS)
+ {
+ if (debug)
+ pam_syslog (pamh, LOG_DEBUG,
+ "pam_get_item (PAM_AUTHTOK) failed, return %d",
+ retval);
+ return retval;
+ }
+ else if (void_pass == NULL)
+ {
+ char *resp = NULL;
+
+ retval = pam_prompt (pamh, PAM_PROMPT_ECHO_OFF,
+ &resp, _("Password: "));
+
+ if (retval != PAM_SUCCESS)
+ {
+ _pam_drop (resp);
+ if (retval == PAM_CONV_AGAIN)
+ retval = PAM_INCOMPLETE;
+ return retval;
+ }
+
+ if (resp)
+ {
+ pam_set_item (pamh, PAM_AUTHTOK, resp);
+ strncpy (authtok, resp, sizeof(authtok) - 1);
+ _pam_drop (resp);
+ }
+ }
+ else
+ strncpy (authtok, void_pass, sizeof(authtok) - 1);
+
+ if (pipe(fds) != 0)
+ {
+ pam_syslog (pamh, LOG_ERR, "Could not create pipe: %m");
+ return PAM_SYSTEM_ERR;
+ }
+ }
+ }
+
+ if (use_stdout)
+ {
+ if (pipe(stdout_fds) != 0)
+ {
+ pam_syslog (pamh, LOG_ERR, "Could not create pipe: %m");
+ return PAM_SYSTEM_ERR;
+ }
+ stdout_file = fdopen(stdout_fds[0], "r");
+ if (!stdout_file)
+ {
+ pam_syslog (pamh, LOG_ERR, "Could not fdopen pipe: %m");
+ return PAM_SYSTEM_ERR;
+ }
+ }
+
+ if (optargc >= argc) {
+ pam_syslog (pamh, LOG_ERR, "No path given as argument");
+ return PAM_SERVICE_ERR;
+ }
+
+ pid = fork();
+ if (pid == -1)
+ return PAM_SYSTEM_ERR;
+ if (pid > 0) /* parent */
+ {
+ int status = 0;
+ pid_t rc;
+
+ if (expose_authtok) /* send the password to the child */
+ {
+ if (debug)
+ pam_syslog (pamh, LOG_DEBUG, "send password to child");
+ if (write(fds[1], authtok, strlen(authtok)) == -1)
+ pam_syslog (pamh, LOG_ERR,
+ "sending password to child failed: %m");
+
+ close(fds[0]); /* close here to avoid possible SIGPIPE above */
+ close(fds[1]);
+ }
+
+ if (use_stdout)
+ {
+ char buf[4096];
+ close(stdout_fds[1]);
+ while (fgets(buf, sizeof(buf), stdout_file) != NULL)
+ {
+ size_t len;
+ len = strlen(buf);
+ if (buf[len-1] == '\n')
+ buf[len-1] = '\0';
+ pam_info(pamh, "%s", buf);
+ }
+ fclose(stdout_file);
+ }
+
+ while ((rc = waitpid (pid, &status, 0)) == -1 &&
+ errno == EINTR);
+ if (rc == (pid_t)-1)
+ {
+ pam_syslog (pamh, LOG_ERR, "waitpid returns with -1: %m");
+ return PAM_SYSTEM_ERR;
+ }
+ else if (status != 0)
+ {
+ if (WIFEXITED(status))
+ {
+ if (!quiet_log)
+ pam_syslog (pamh, LOG_ERR, "%s failed: exit code %d",
+ argv[optargc], WEXITSTATUS(status));
+ if (!quiet)
+ pam_error (pamh, _("%s failed: exit code %d"),
+ argv[optargc], WEXITSTATUS(status));
+ }
+ else if (WIFSIGNALED(status))
+ {
+ if (!quiet_log)
+ pam_syslog (pamh, LOG_ERR, "%s failed: caught signal %d%s",
+ argv[optargc], WTERMSIG(status),
+ WCOREDUMP(status) ? " (core dumped)" : "");
+ if (!quiet)
+ pam_error (pamh, _("%s failed: caught signal %d%s"),
+ argv[optargc], WTERMSIG(status),
+ WCOREDUMP(status) ? " (core dumped)" : "");
+ }
+ else
+ {
+ if (!quiet_log)
+ pam_syslog (pamh, LOG_ERR, "%s failed: unknown status 0x%x",
+ argv[optargc], status);
+ if (!quiet)
+ pam_error (pamh, _("%s failed: unknown status 0x%x"),
+ argv[optargc], status);
+ }
+ return PAM_SYSTEM_ERR;
+ }
+ return PAM_SUCCESS;
+ }
+ else /* child */
+ {
+ char **arggv;
+ int i;
+ char **envlist, **tmp;
+ int envlen, nitems;
+ char *envstr;
+ enum pam_modutil_redirect_fd redirect_stdin =
+ expose_authtok ? PAM_MODUTIL_IGNORE_FD : PAM_MODUTIL_PIPE_FD;
+ enum pam_modutil_redirect_fd redirect_stdout =
+ (use_stdout || logfile) ? PAM_MODUTIL_IGNORE_FD : PAM_MODUTIL_NULL_FD;
+
+ /* First, move all the pipes off of stdin, stdout, and stderr, to ensure
+ * that calls to dup2 won't close them. */
+
+ if (expose_authtok)
+ {
+ fds[0] = move_fd_to_non_stdio(pamh, fds[0]);
+ close(fds[1]);
+ }
+
+ if (use_stdout)
+ {
+ stdout_fds[1] = move_fd_to_non_stdio(pamh, stdout_fds[1]);
+ close(stdout_fds[0]);
+ }
+
+ /* Set up stdin. */
+
+ if (expose_authtok)
+ {
+ /* reopen stdin as pipe */
+ if (dup2(fds[0], STDIN_FILENO) == -1)
+ {
+ int err = errno;
+ pam_syslog (pamh, LOG_ERR, "dup2 of STDIN failed: %m");
+ _exit (err);
+ }
+ }
+
+ /* Set up stdout. */
+
+ if (use_stdout)
+ {
+ if (dup2(stdout_fds[1], STDOUT_FILENO) == -1)
+ {
+ int err = errno;
+ pam_syslog (pamh, LOG_ERR, "dup2 to stdout failed: %m");
+ _exit (err);
+ }
+ }
+ else if (logfile)
+ {
+ time_t tm = time (NULL);
+ char *buffer = NULL;
+
+ close (STDOUT_FILENO);
+ if ((i = open (logfile, O_CREAT|O_APPEND|O_WRONLY,
+ S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH)) == -1)
+ {
+ int err = errno;
+ pam_syslog (pamh, LOG_ERR, "open of %s failed: %m",
+ logfile);
+ _exit (err);
+ }
+ if (i != STDOUT_FILENO)
+ {
+ if (dup2 (i, STDOUT_FILENO) == -1)
+ {
+ int err = errno;
+ pam_syslog (pamh, LOG_ERR, "dup2 failed: %m");
+ _exit (err);
+ }
+ close (i);
+ }
+ if (asprintf (&buffer, "*** %s", ctime (&tm)) > 0)
+ {
+ pam_modutil_write (STDOUT_FILENO, buffer, strlen (buffer));
+ free (buffer);
+ }
+ }
+
+ if ((use_stdout || logfile) &&
+ dup2 (STDOUT_FILENO, STDERR_FILENO) == -1)
+ {
+ int err = errno;
+ pam_syslog (pamh, LOG_ERR, "dup2 failed: %m");
+ _exit (err);
+ }
+
+ if (pam_modutil_sanitize_helper_fds(pamh, redirect_stdin,
+ redirect_stdout, redirect_stdout) < 0)
+ _exit(1);
+
+ if (call_setuid)
+ if (setuid (geteuid ()) == -1)
+ {
+ int err = errno;
+ pam_syslog (pamh, LOG_ERR, "setuid(%lu) failed: %m",
+ (unsigned long) geteuid ());
+ _exit (err);
+ }
+
+ if (setsid () == -1)
+ {
+ int err = errno;
+ pam_syslog (pamh, LOG_ERR, "setsid failed: %m");
+ _exit (err);
+ }
+
+ arggv = calloc (argc + 4, sizeof (char *));
+ if (arggv == NULL)
+ _exit (ENOMEM);
+
+ for (i = 0; i < (argc - optargc); i++)
+ arggv[i] = strdup(argv[i+optargc]);
+ arggv[i] = NULL;
+
+ /*
+ * Set up the child's environment list. It consists of the PAM
+ * environment, plus a few hand-picked PAM items.
+ */
+ envlist = pam_getenvlist(pamh);
+ for (envlen = 0; envlist[envlen] != NULL; ++envlen)
+ /* nothing */ ;
+ nitems = PAM_ARRAY_SIZE(env_items);
+ /* + 2 because of PAM_TYPE and NULL entry */
+ tmp = realloc(envlist, (envlen + nitems + 2) * sizeof(*envlist));
+ if (tmp == NULL)
+ {
+ free(envlist);
+ pam_syslog (pamh, LOG_CRIT, "realloc environment failed: %m");
+ _exit (ENOMEM);
+ }
+ envlist = tmp;
+ for (i = 0; i < nitems; ++i)
+ {
+ const void *item;
+
+ if (pam_get_item(pamh, env_items[i].item, &item) != PAM_SUCCESS || item == NULL)
+ continue;
+ if (asprintf(&envstr, "%s=%s", env_items[i].name, (const char *)item) < 0)
+ {
+ free(envlist);
+ pam_syslog (pamh, LOG_CRIT, "prepare environment failed: %m");
+ _exit (ENOMEM);
+ }
+ envlist[envlen++] = envstr;
+ envlist[envlen] = NULL;
+ }
+
+ if (asprintf(&envstr, "PAM_TYPE=%s", pam_type) < 0)
+ {
+ free(envlist);
+ pam_syslog (pamh, LOG_CRIT, "prepare environment failed: %m");
+ _exit (ENOMEM);
+ }
+ envlist[envlen++] = envstr;
+ envlist[envlen] = NULL;
+
+ if (debug)
+ pam_syslog (pamh, LOG_DEBUG, "Calling %s ...", arggv[0]);
+
+ execve (arggv[0], arggv, envlist);
+ i = errno;
+ pam_syslog (pamh, LOG_ERR, "execve(%s,...) failed: %m", arggv[0]);
+ free(envlist);
+ _exit (i);
+ }
+ return PAM_SYSTEM_ERR; /* will never be reached. */
+}
+
+int
+pam_sm_authenticate (pam_handle_t *pamh, int flags UNUSED,
+ int argc, const char **argv)
+{
+ return call_exec ("auth", pamh, argc, argv);
+}
+
+int
+pam_sm_setcred (pam_handle_t *pamh UNUSED, int flags UNUSED,
+ int argc UNUSED, const char **argv UNUSED)
+{
+ return PAM_IGNORE;
+}
+
+/* password updating functions */
+
+int
+pam_sm_chauthtok(pam_handle_t *pamh, int flags,
+ int argc, const char **argv)
+{
+ if (flags & PAM_PRELIM_CHECK)
+ return PAM_SUCCESS;
+ return call_exec ("password", pamh, argc, argv);
+}
+
+int
+pam_sm_acct_mgmt(pam_handle_t *pamh, int flags UNUSED,
+ int argc, const char **argv)
+{
+ return call_exec ("account", pamh, argc, argv);
+}
+
+int
+pam_sm_open_session(pam_handle_t *pamh, int flags UNUSED,
+ int argc, const char **argv)
+{
+ return call_exec ("open_session", pamh, argc, argv);
+}
+
+int
+pam_sm_close_session(pam_handle_t *pamh, int flags UNUSED,
+ int argc, const char **argv)
+{
+ return call_exec ("close_session", pamh, argc, argv);
+}
diff --git a/modules/pam_exec/tst-pam_exec b/modules/pam_exec/tst-pam_exec
new file mode 100755
index 0000000..a0b0039
--- /dev/null
+++ b/modules/pam_exec/tst-pam_exec
@@ -0,0 +1,2 @@
+#!/bin/sh
+../../tests/tst-dlopen .libs/pam_exec.so