diff options
Diffstat (limited to 'modules/pam_group')
| -rw-r--r-- | modules/pam_group/Makefile.am | 35 | ||||
| -rw-r--r-- | modules/pam_group/Makefile.in | 1217 | ||||
| -rw-r--r-- | modules/pam_group/README | 52 | ||||
| -rw-r--r-- | modules/pam_group/README.xml | 34 | ||||
| -rw-r--r-- | modules/pam_group/group.conf | 106 | ||||
| -rw-r--r-- | modules/pam_group/group.conf.5 | 121 | ||||
| -rw-r--r-- | modules/pam_group/group.conf.5.xml | 147 | ||||
| -rw-r--r-- | modules/pam_group/pam_group.8 | 109 | ||||
| -rw-r--r-- | modules/pam_group/pam_group.8.xml | 162 | ||||
| -rw-r--r-- | modules/pam_group/pam_group.c | 815 | ||||
| -rwxr-xr-x | modules/pam_group/tst-pam_group | 2 |
11 files changed, 2800 insertions, 0 deletions
diff --git a/modules/pam_group/Makefile.am b/modules/pam_group/Makefile.am new file mode 100644 index 00000000..a9a0a1ef --- /dev/null +++ b/modules/pam_group/Makefile.am @@ -0,0 +1,35 @@ +# +# Copyright (c) 2005, 2006, 2009 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ +MAINTAINERCLEANFILES = $(MANS) README + +EXTRA_DIST = $(XMLS) + +if HAVE_DOC +dist_man_MANS = group.conf.5 pam_group.8 +endif +XMLS = README.xml group.conf.5.xml pam_group.8.xml +dist_check_SCRIPTS = tst-pam_group +TESTS = $(dist_check_SCRIPTS) + +securelibdir = $(SECUREDIR) +secureconfdir = $(SCONFIGDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include \ + -DPAM_GROUP_CONF=\"$(SCONFIGDIR)/group.conf\" $(WARN_CFLAGS) +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +securelib_LTLIBRARIES = pam_group.la +pam_group_la_LIBADD = $(top_builddir)/libpam/libpam.la + +dist_secureconf_DATA = group.conf + +if ENABLE_REGENERATE_MAN +dist_noinst_DATA = README +-include $(top_srcdir)/Make.xml.rules +endif diff --git a/modules/pam_group/Makefile.in b/modules/pam_group/Makefile.in new file mode 100644 index 00000000..1761ebfd --- /dev/null +++ b/modules/pam_group/Makefile.in @@ -0,0 +1,1217 @@ +# Makefile.in generated by automake 1.16.1 from Makefile.am. +# @configure_input@ + +# Copyright (C) 1994-2018 Free Software Foundation, Inc. + +# This Makefile.in is free software; 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Such memberships are based on the service they are +applying for. + +By default rules for group memberships are taken from config file /etc/security +/group.conf. + +This module's usefulness relies on the file-systems accessible to the user. The +point being that once granted the membership of a group, the user may attempt +to create a setgid binary with a restricted group ownership. Later, when the +user is not given membership to this group, they can recover group membership +with the precompiled binary. The reason that the file-systems that the user has +access to are so significant, is the fact that when a system is mounted nosuid +the user is unable to create or execute such a binary file. For this module to +provide any level of security, all file-systems that the user has write access +to should be mounted nosuid. + +The pam_group module functions in parallel with the /etc/group file. If the +user is granted any groups based on the behavior of this module, they are +granted in addition to those entries /etc/group (or equivalent). + +EXAMPLES + +These are some example lines which might be specified in /etc/security/ +group.conf. + +Running 'xsh' on tty* (any ttyXXX device), the user 'us' is given access to the +floppy (through membership of the floppy group) + +xsh;tty*&!ttyp*;us;Al0000-2400;floppy + +Running 'xsh' on tty* (any ttyXXX device), the users 'sword', 'pike' and +'shield' are given access to games (through membership of the floppy group) +after work hours. + +xsh; tty* ;sword|pike|shield;!Wk0900-1800;games, sound +xsh; tty* ;*;Al0900-1800;floppy + + +Any member of the group 'admin' running 'xsh' on tty*, is granted access (at +any time) to the group 'plugdev' + +xsh; tty* ;%admin;Al0000-2400;plugdev + + diff --git a/modules/pam_group/README.xml b/modules/pam_group/README.xml new file mode 100644 index 00000000..387d6987 --- /dev/null +++ b/modules/pam_group/README.xml @@ -0,0 +1,34 @@ +<?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 pamgroup SYSTEM "pam_group.8.xml"> +--> +<!-- +<!ENTITY groupconf SYSTEM "group.conf.5.xml"> +--> +]> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_group.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_group-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_group.8.xml" xpointer='xpointer(//refsect1[@id = "pam_group-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="group.conf.5.xml" xpointer='xpointer(//refsect1[@id = "group.conf-examples"]/*)'/> + </section> + +</article> diff --git a/modules/pam_group/group.conf b/modules/pam_group/group.conf new file mode 100644 index 00000000..7c07a260 --- /dev/null +++ b/modules/pam_group/group.conf @@ -0,0 +1,106 @@ +# +# This is the configuration file for the pam_group module. +# + +# +# *** Please note that giving group membership on a session basis is +# *** NOT inherently secure. If a user can create an executable that +# *** is setgid a group that they are infrequently given membership +# *** of, they can basically obtain group membership any time they +# *** like. Example: games are allowed between the hours of 6pm and 6am +# *** user joe logs in at 7pm writes a small C-program toplay.c that +# *** invokes their favorite shell, compiles it and does +# *** "chgrp play toplay; chmod g+s toplay". They are basically able +# *** to play games any time... You have been warned. AGM +# + +# +# The syntax of the lines is as follows: +# +# services;ttys;users;times;groups +# +# white space is ignored and lines maybe extended with '\\n' (escaped +# newlines). From reading these comments, it is clear that +# text following a '#' is ignored to the end of the line. +# +# the combination of individual users/terminals etc is a logic list +# namely individual tokens that are optionally prefixed with '!' (logical +# not) and separated with '&' (logical and) and '|' (logical or). +# +# services +# is a logic list of PAM service names that the rule applies to. +# +# ttys +# is a logic list of terminal names that this rule applies to. +# +# users +# is a logic list of users or a netgroup of users to whom this +# rule applies. +# +# NB. For these items the simple wildcard '*' may be used only once. +# With netgroups no wildcards or logic operators are allowed. +# +# times +# It is used to indicate "when" these groups are to be given to the +# user. The format here is a logic list of day/time-range +# entries the days are specified by a sequence of two character +# entries, MoTuSa for example is Monday Tuesday and Saturday. Note +# that repeated days are unset MoMo = no day, and MoWk = all weekdays +# bar Monday. The two character combinations accepted are +# +# Mo Tu We Th Fr Sa Su Wk Wd Al +# +# the last two being week-end days and all 7 days of the week +# respectively. As a final example, AlFr means all days except Friday. +# +# Each day/time-range can be prefixed with a '!' to indicate "anything +# but" +# +# The time-range part is two 24-hour times HHMM separated by a hyphen +# indicating the start and finish time (if the finish time is smaller +# than the start time it is deemed to apply on the following day). +# +# groups +# The (comma or space separated) list of groups that the user +# inherits membership of. These groups are added if the previous +# fields are satisfied by the user's request +# +# For a rule to be active, ALL of service+ttys+users must be satisfied +# by the applying process. +# + +# +# Note, to get this to work as it is currently typed you need +# +# 1. to run an application as root +# 2. add the following groups to the /etc/group file: +# floppy, play, sound +# + +# +# Here is a simple example: running 'xsh' on tty* (any ttyXXX device), +# the user 'us' is given access to the floppy (through membership of +# the floppy group) +# + +#xsh;tty*&!ttyp*;us;Al0000-2400;floppy + +# +# another example: running 'xsh' on tty* (any ttyXXX device), +# the user 'sword' is given access to games (through membership of +# the sound and play group) after work hours. +# + +#xsh; tty* ;sword;!Wk0900-1800;sound, play +#xsh; tty* ;*;Al0900-1800;floppy + +# +# yet another example: any member of the group 'admin' running +# 'xsh' on tty*, is granted access (at any time) to the group 'plugdev' +# + +#xsh; tty* ;%admin;Al0000-2400;plugdev + +# +# End of group.conf file +# diff --git a/modules/pam_group/group.conf.5 b/modules/pam_group/group.conf.5 new file mode 100644 index 00000000..8e359a78 --- /dev/null +++ b/modules/pam_group/group.conf.5 @@ -0,0 +1,121 @@ +'\" t +.\" Title: group.conf +.\" Author: [see the "AUTHOR" section] +.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/> +.\" Date: 06/08/2020 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" Language: English +.\" +.TH "GROUP\&.CONF" "5" "06/08/2020" "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" +group.conf \- configuration file for the pam_group module +.SH "DESCRIPTION" +.PP +The pam_group PAM module does not authenticate the user, but instead it grants group memberships (in the credential setting phase of the authentication module) to the user\&. Such memberships are based on the service they are applying for\&. +.PP +For this module to function correctly there must be a correctly formatted +/etc/security/group\&.conf +file present\&. White spaces are ignored and lines maybe extended with \*(Aq\e\*(Aq (escaped newlines)\&. Text following a \*(Aq#\*(Aq is ignored to the end of the line\&. +.PP +The syntax of the lines is as follows: +.PP +\fIservices\fR;\fIttys\fR;\fIusers\fR;\fItimes\fR;\fIgroups\fR +.PP +The first field, the +\fIservices\fR +field, is a logic list of PAM service names that the rule applies to\&. +.PP +The second field, the +\fItty\fR +field, is a logic list of terminal names that this rule applies to\&. +.PP +The third field, the +\fIusers\fR +field, is a logic list of users, or a UNIX group, or a netgroup of users to whom this rule applies\&. Group names are preceded by a \*(Aq%\*(Aq symbol, while netgroup names are preceded by a \*(Aq@\*(Aq symbol\&. +.PP +A logic list namely means individual tokens that are optionally prefixed with \*(Aq!\*(Aq (logical not) and separated with \*(Aq&\*(Aq (logical and) and \*(Aq|\*(Aq (logical or)\&. +.PP +For these items the simple wildcard \*(Aq*\*(Aq may be used only once\&. With UNIX groups or netgroups no wildcards or logic operators are allowed\&. +.PP +The +\fItimes\fR +field is used to indicate "when" these groups are to be given to the user\&. The format here is a logic list of day/time\-range entries\&. The days are specified by a sequence of two character entries, MoTuSa for example is Monday Tuesday and Saturday\&. Note that repeated days are unset MoMo = no day, and MoWk = all weekdays bar Monday\&. The two character combinations accepted are Mo Tu We Th Fr Sa Su Wk Wd Al, the last two being week\-end days and all 7 days of the week respectively\&. As a final example, AlFr means all days except Friday\&. +.PP +Each day/time\-range can be prefixed with a \*(Aq!\*(Aq to indicate "anything but"\&. The time\-range part is two 24\-hour times HHMM, separated by a hyphen, indicating the start and finish time (if the finish time is smaller than the start time it is deemed to apply on the following day)\&. +.PP +The +\fIgroups\fR +field is a comma or space separated list of groups that the user inherits membership of\&. These groups are added if the previous fields are satisfied by the user\*(Aqs request\&. +.PP +For a rule to be active, ALL of service+ttys+users must be satisfied by the applying process\&. +.SH "EXAMPLES" +.PP +These are some example lines which might be specified in +/etc/security/group\&.conf\&. +.PP +Running \*(Aqxsh\*(Aq on tty* (any ttyXXX device), the user \*(Aqus\*(Aq is given access to the floppy (through membership of the floppy group) +.sp +.if n \{\ +.RS 4 +.\} +.nf +xsh;tty*&!ttyp*;us;Al0000\-2400;floppy +.fi +.if n \{\ +.RE +.\} +.PP +Running \*(Aqxsh\*(Aq on tty* (any ttyXXX device), the users \*(Aqsword\*(Aq, \*(Aqpike\*(Aq and \*(Aqshield\*(Aq are given access to games (through membership of the floppy group) after work hours\&. +.sp +.if n \{\ +.RS 4 +.\} +.nf +xsh; tty* ;sword|pike|shield;!Wk0900\-1800;games, sound +xsh; tty* ;*;Al0900\-1800;floppy + +.fi +.if n \{\ +.RE +.\} +.PP +Any member of the group \*(Aqadmin\*(Aq running \*(Aqxsh\*(Aq on tty*, is granted access (at any time) to the group \*(Aqplugdev\*(Aq +.sp +.if n \{\ +.RS 4 +.\} +.nf +xsh; tty* ;%admin;Al0000\-2400;plugdev + +.fi +.if n \{\ +.RE +.\} +.SH "SEE ALSO" +.PP +\fBpam_group\fR(8), +\fBpam.d\fR(5), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_group was written by Andrew G\&. Morgan <morgan@kernel\&.org>\&. diff --git a/modules/pam_group/group.conf.5.xml b/modules/pam_group/group.conf.5.xml new file mode 100644 index 00000000..2b7fb345 --- /dev/null +++ b/modules/pam_group/group.conf.5.xml @@ -0,0 +1,147 @@ +<?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="group.conf"> + + <refmeta> + <refentrytitle>group.conf</refentrytitle> + <manvolnum>5</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv> + <refname>group.conf</refname> + <refpurpose>configuration file for the pam_group module</refpurpose> + </refnamediv> + + <refsect1 id='group.conf-description'> + <title>DESCRIPTION</title> + + <para> + The pam_group PAM module does not authenticate the user, but instead + it grants group memberships (in the credential setting phase of the + authentication module) to the user. Such memberships are based on the + service they are applying for. + </para> + <para> + For this module to function correctly there must be a correctly + formatted <filename>/etc/security/group.conf</filename> file present. + White spaces are ignored and lines maybe extended with '\' (escaped + newlines). Text following a '#' is ignored to the end of the line. + </para> + + <para> + The syntax of the lines is as follows: + </para> + + <para> + <replaceable>services</replaceable>;<replaceable>ttys</replaceable>;<replaceable>users</replaceable>;<replaceable>times</replaceable>;<replaceable>groups</replaceable> + </para> + + + <para> + The first field, the <replaceable>services</replaceable> field, is a logic list + of PAM service names that the rule applies to. + </para> + + <para> + The second field, the <replaceable>tty</replaceable> + field, is a logic list of terminal names that this rule applies to. + </para> + + <para> + The third field, the <replaceable>users</replaceable> + field, is a logic list of users, or a UNIX group, or a netgroup of + users to whom this rule applies. Group names are preceded by a '%' + symbol, while netgroup names are preceded by a '@' symbol. + </para> + + <para> + A logic list namely means individual tokens that are optionally prefixed + with '!' (logical not) and separated with '&' (logical and) and '|' + (logical or). + </para> + + <para> + For these items the simple wildcard '*' may be used only once. + With UNIX groups or netgroups no wildcards or logic operators + are allowed. + </para> + + <para> + The <replaceable>times</replaceable> field is used to indicate "when" + these groups are to be given to the user. The format here is a logic + list of day/time-range entries. The days are specified by a sequence of + two character entries, MoTuSa for example is Monday Tuesday and Saturday. + Note that repeated days are unset MoMo = no day, and MoWk = all weekdays + bar Monday. The two character combinations accepted are Mo Tu We Th Fr Sa + Su Wk Wd Al, the last two being week-end days and all 7 days of the week + respectively. As a final example, AlFr means all days except Friday. + </para> + <para> + Each day/time-range can be prefixed with a '!' to indicate "anything but". + The time-range part is two 24-hour times HHMM, separated by a hyphen, + indicating the start and finish time (if the finish time is smaller + than the start time it is deemed to apply on the following day). + </para> + + <para> + The <replaceable>groups</replaceable> field is a comma or space + separated list of groups that the user inherits membership of. These + groups are added if the previous fields are satisfied by the user's request. + </para> + + <para> + For a rule to be active, ALL of service+ttys+users must be satisfied + by the applying process. + </para> + </refsect1> + + <refsect1 id="group.conf-examples"> + <title>EXAMPLES</title> + <para> + These are some example lines which might be specified in + <filename>/etc/security/group.conf</filename>. + </para> + + <para> + Running 'xsh' on tty* (any ttyXXX device), the user 'us' is given access + to the floppy (through membership of the floppy group) + </para> + <programlisting>xsh;tty*&!ttyp*;us;Al0000-2400;floppy</programlisting> + + <para> + Running 'xsh' on tty* (any ttyXXX device), the users 'sword', 'pike' and + 'shield' are given access to games (through membership of the floppy group) after work hours. + </para> + <programlisting> +xsh; tty* ;sword|pike|shield;!Wk0900-1800;games, sound +xsh; tty* ;*;Al0900-1800;floppy + </programlisting> + <para> + Any member of the group 'admin' running 'xsh' on tty*, + is granted access (at any time) to the group 'plugdev' + </para> + <programlisting> +xsh; tty* ;%admin;Al0000-2400;plugdev + </programlisting> + + </refsect1> + + <refsect1 id="group.conf-see_also"> + <title>SEE ALSO</title> + <para> + <citerefentry><refentrytitle>pam_group</refentrytitle><manvolnum>8</manvolnum></citerefentry>, + <citerefentry><refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum></citerefentry> + </para> + </refsect1> + + <refsect1 id="group.conf-author"> + <title>AUTHOR</title> + <para> + pam_group was written by Andrew G. Morgan <morgan@kernel.org>. + </para> + </refsect1> +</refentry> diff --git a/modules/pam_group/pam_group.8 b/modules/pam_group/pam_group.8 new file mode 100644 index 00000000..94b4afb0 --- /dev/null +++ b/modules/pam_group/pam_group.8 @@ -0,0 +1,109 @@ +'\" t +.\" Title: pam_group +.\" Author: [see the "AUTHORS" section] +.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/> +.\" Date: 06/08/2020 +.\" Manual: Linux-PAM Manual +.\" Source: Linux-PAM Manual +.\" Language: English +.\" +.TH "PAM_GROUP" "8" "06/08/2020" "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_group \- PAM module for group access +.SH "SYNOPSIS" +.HP \w'\fBpam_group\&.so\fR\ 'u +\fBpam_group\&.so\fR +.SH "DESCRIPTION" +.PP +The pam_group PAM module does not authenticate the user, but instead it grants group memberships (in the credential setting phase of the authentication module) to the user\&. Such memberships are based on the service they are applying for\&. +.PP +By default rules for group memberships are taken from config file +/etc/security/group\&.conf\&. +.PP +This module\*(Aqs usefulness relies on the file\-systems accessible to the user\&. The point being that once granted the membership of a group, the user may attempt to create a +\fBsetgid\fR +binary with a restricted group ownership\&. Later, when the user is not given membership to this group, they can recover group membership with the precompiled binary\&. The reason that the file\-systems that the user has access to are so significant, is the fact that when a system is mounted +\fInosuid\fR +the user is unable to create or execute such a binary file\&. For this module to provide any level of security, all file\-systems that the user has write access to should be mounted +\fInosuid\fR\&. +.PP +The pam_group module functions in parallel with the +/etc/group +file\&. If the user is granted any groups based on the behavior of this module, they are granted +\fIin addition\fR +to those entries +/etc/group +(or equivalent)\&. +.SH "OPTIONS" +.PP +This module does not recognise any options\&. +.SH "MODULE TYPES PROVIDED" +.PP +Only the +\fBauth\fR +module type is provided\&. +.SH "RETURN VALUES" +.PP +PAM_SUCCESS +.RS 4 +group membership was granted\&. +.RE +.PP +PAM_ABORT +.RS 4 +Not all relevant data could be gotten\&. +.RE +.PP +PAM_BUF_ERR +.RS 4 +Memory buffer error\&. +.RE +.PP +PAM_CRED_ERR +.RS 4 +Group membership was not granted\&. +.RE +.PP +PAM_IGNORE +.RS 4 +\fBpam_sm_authenticate\fR +was called which does nothing\&. +.RE +.PP +PAM_USER_UNKNOWN +.RS 4 +The user is not known to the system\&. +.RE +.SH "FILES" +.PP +/etc/security/group\&.conf +.RS 4 +Default configuration file +.RE +.SH "SEE ALSO" +.PP +\fBgroup.conf\fR(5), +\fBpam.d\fR(5), +\fBpam\fR(8)\&. +.SH "AUTHORS" +.PP +pam_group was written by Andrew G\&. Morgan <morgan@kernel\&.org>\&. diff --git a/modules/pam_group/pam_group.8.xml b/modules/pam_group/pam_group.8.xml new file mode 100644 index 00000000..2c1c9058 --- /dev/null +++ b/modules/pam_group/pam_group.8.xml @@ -0,0 +1,162 @@ +<?xml version="1.0" encoding="ISO-8859-1"?> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.1.2//EN" + "http://www.oasis-open.org/docbook/xml/4.1.2/docbookx.dtd"> + +<refentry id='pam_group'> + + <refmeta> + <refentrytitle>pam_group</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class='setdesc'>Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id='pam_group-name'> + <refname>pam_group</refname> + <refpurpose> + PAM module for group access + </refpurpose> + </refnamediv> + +<!-- body begins here --> + + <refsynopsisdiv> + <cmdsynopsis id="pam_group-cmdsynopsis"> + <command>pam_group.so</command> + </cmdsynopsis> + </refsynopsisdiv> + + + <refsect1 id="pam_group-description"> + <title>DESCRIPTION</title> + <para> + The pam_group PAM module does not authenticate the user, but instead + it grants group memberships (in the credential setting phase of the + authentication module) to the user. Such memberships are based on the + service they are applying for. + </para> + <para> + By default rules for group memberships are taken from config file + <filename>/etc/security/group.conf</filename>. + </para> + <para> + This module's usefulness relies on the file-systems + accessible to the user. The point being that once granted the + membership of a group, the user may attempt to create a + <function>setgid</function> binary with a restricted group ownership. + Later, when the user is not given membership to this group, they can + recover group membership with the precompiled binary. The reason that + the file-systems that the user has access to are so significant, is the + fact that when a system is mounted <emphasis>nosuid</emphasis> the user + is unable to create or execute such a binary file. For this module to + provide any level of security, all file-systems that the user has write + access to should be mounted <emphasis>nosuid</emphasis>. + </para> + <para> + The pam_group module functions in parallel with the + <filename>/etc/group</filename> file. If the user is granted any groups + based on the behavior of this module, they are granted + <emphasis>in addition</emphasis> to those entries + <filename>/etc/group</filename> (or equivalent). + </para> + </refsect1> + + <refsect1 id="pam_group-options"> + <title>OPTIONS</title> + <para>This module does not recognise any options.</para> + </refsect1> + + <refsect1 id="pam_group-types"> + <title>MODULE TYPES PROVIDED</title> + <para> + Only the <option>auth</option> module type is provided. + </para> + </refsect1> + + <refsect1 id="pam_group-return_values"> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + group membership was granted. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_ABORT</term> + <listitem> + <para> + Not all relevant data could be gotten. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_BUF_ERR</term> + <listitem> + <para> + Memory buffer error. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_CRED_ERR</term> + <listitem> + <para> + Group membership was not granted. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_IGNORE</term> + <listitem> + <para> + <function>pam_sm_authenticate</function> was called which does nothing. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term>PAM_USER_UNKNOWN</term> + <listitem> + <para> + The user is not known to the system. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_group-files"> + <title>FILES</title> + <variablelist> + <varlistentry> + <term><filename>/etc/security/group.conf</filename></term> + <listitem> + <para>Default configuration file</para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_group-see_also"> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>group.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_group-authors"> + <title>AUTHORS</title> + <para> + pam_group was written by Andrew G. Morgan <morgan@kernel.org>. + </para> + </refsect1> +</refentry> diff --git a/modules/pam_group/pam_group.c b/modules/pam_group/pam_group.c new file mode 100644 index 00000000..d9a35ea6 --- /dev/null +++ b/modules/pam_group/pam_group.c @@ -0,0 +1,815 @@ +/* + * pam_group module + * + * Written by Andrew Morgan <morgan@linux.kernel.org> 1996/7/6 + * Field parsing rewritten by Tomas Mraz <tm@t8m.info> + */ + +#include "config.h" + +#include <sys/file.h> +#include <stdio.h> +#include <stdlib.h> +#include <ctype.h> +#include <unistd.h> +#include <stdarg.h> +#include <time.h> +#include <syslog.h> +#include <string.h> + +#include <grp.h> +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <netdb.h> + +#define PAM_GROUP_BUFLEN 1000 +#define FIELD_SEPARATOR ';' /* this is new as of .02 */ + +#ifndef TRUE +# define TRUE 1 +#endif +#ifndef FALSE +# define FALSE 0 +#endif + +typedef enum { AND, OR } operator; + +#include <security/pam_modules.h> +#include <security/_pam_macros.h> +#include <security/pam_modutil.h> +#include <security/pam_ext.h> + +/* --- static functions for checking whether the user should be let in --- */ + +static char * +shift_buf(char *mem, int from) +{ + char *start = mem; + while ((*mem = mem[from]) != '\0') + ++mem; + memset(mem, '\0', PAM_GROUP_BUFLEN - (mem - start)); + return mem; +} + +static void +trim_spaces(char *buf, char *from) +{ + while (from > buf) { + --from; + if (*from == ' ') + *from = '\0'; + else + break; + } +} + +#define STATE_NL 0 /* new line starting */ +#define STATE_COMMENT 1 /* inside comment */ +#define STATE_FIELD 2 /* field following */ +#define STATE_EOF 3 /* end of file or error */ + +static int +read_field(const pam_handle_t *pamh, int fd, char **buf, int *from, int *state) +{ + char *to; + char *src; + int i; + char c; + int onspace; + + /* is buf set ? */ + if (! *buf) { + *buf = (char *) calloc(1, PAM_GROUP_BUFLEN+1); + if (! *buf) { + pam_syslog(pamh, LOG_CRIT, "out of memory"); + D(("no memory")); + *state = STATE_EOF; + return -1; + } + *from = 0; + *state = STATE_NL; + fd = open(PAM_GROUP_CONF, O_RDONLY); + if (fd < 0) { + pam_syslog(pamh, LOG_ERR, "error opening %s: %m", PAM_GROUP_CONF); + _pam_drop(*buf); + *state = STATE_EOF; + return -1; + } + } + + if (*from > 0) + to = shift_buf(*buf, *from); + else + to = *buf; + + while (fd != -1 && to - *buf < PAM_GROUP_BUFLEN) { + i = pam_modutil_read(fd, to, PAM_GROUP_BUFLEN - (to - *buf)); + if (i < 0) { + pam_syslog(pamh, LOG_ERR, "error reading %s: %m", PAM_GROUP_CONF); + close(fd); + memset(*buf, 0, PAM_GROUP_BUFLEN); + _pam_drop(*buf); + *state = STATE_EOF; + return -1; + } else if (!i) { + close(fd); + fd = -1; /* end of file reached */ + } + + to += i; + } + + if (to == *buf) { + /* nothing previously in buf, nothing read */ + _pam_drop(*buf); + *state = STATE_EOF; + return -1; + } + + memset(to, '\0', PAM_GROUP_BUFLEN - (to - *buf)); + + to = *buf; + onspace = 1; /* delete any leading spaces */ + + for (src = to; (c=*src) != '\0'; ++src) { + if (*state == STATE_COMMENT && c != '\n') { + continue; + } + + switch (c) { + case '\n': + *state = STATE_NL; + *to = '\0'; + *from = (src - *buf) + 1; + trim_spaces(*buf, to); + return fd; + + case '\t': + case ' ': + if (!onspace) { + onspace = 1; + *to++ = ' '; + } + break; + + case '!': + onspace = 1; /* ignore following spaces */ + *to++ = '!'; + break; + + case '#': + *state = STATE_COMMENT; + break; + + case FIELD_SEPARATOR: + *state = STATE_FIELD; + *to = '\0'; + *from = (src - *buf) + 1; + trim_spaces(*buf, to); + return fd; + + case '\\': + if (src[1] == '\n') { + ++src; /* skip it */ + break; + } + /* fallthrough */ + default: + *to++ = c; + onspace = 0; + } + if (src > to) + *src = '\0'; /* clearing */ + } + + if (*state != STATE_COMMENT) { + *state = STATE_COMMENT; + pam_syslog(pamh, LOG_ERR, "field too long - ignored"); + **buf = '\0'; + } else { + *to = '\0'; + trim_spaces(*buf, to); + } + + *from = 0; + return fd; +} + +/* read a member from a field */ + +static int logic_member(const char *string, int *at) +{ + int c,to; + int done=0; + int token=0; + + to=*at; + do { + c = string[to++]; + + switch (c) { + + case '\0': + --to; + done = 1; + break; + + case '&': + case '|': + case '!': + if (token) { + --to; + } + done = 1; + break; + + default: + if (isalpha(c) || c == '*' || isdigit(c) || c == '_' + || c == '-' || c == '.' || c == '/' || c == ':') { + token = 1; + } else if (token) { + --to; + done = 1; + } else { + ++*at; + } + } + } while (!done); + + return to - *at; +} + +typedef enum { VAL, OP } expect; + +static int +logic_field (const pam_handle_t *pamh, const void *me, + const char *x, int rule, + int (*agrees)(const pam_handle_t *pamh, const void *, + const char *, int, int)) +{ + int left=FALSE, right, not=FALSE; + operator oper=OR; + int at=0, l; + expect next=VAL; + + while ((l = logic_member(x,&at))) { + int c = x[at]; + + if (next == VAL) { + if (c == '!') + not = !not; + else if (isalpha(c) || c == '*' || isdigit(c) || c == '_' + || c == '-' || c == '.' || c == '/' || c == ':') { + right = not ^ agrees(pamh, me, x+at, l, rule); + if (oper == AND) + left &= right; + else + left |= right; + next = OP; + } else { + pam_syslog(pamh, LOG_ERR, + "garbled syntax; expected name (rule #%d)", + rule); + return FALSE; + } + } else { /* OP */ + switch (c) { + case '&': + oper = AND; + break; + case '|': + oper = OR; + break; + default: + pam_syslog(pamh, LOG_ERR, + "garbled syntax; expected & or | (rule #%d)", + rule); + D(("%c at %d",c,at)); + return FALSE; + } + next = VAL; + not = FALSE; + } + at += l; + } + + return left; +} + +static int +is_same (const pam_handle_t *pamh UNUSED, + const void *A, const char *b, int len, int rule UNUSED) +{ + int i; + const char *a; + + a = A; + for (i=0; len > 0; ++i, --len) { + if (b[i] != a[i]) { + if (b[i++] == '*') { + return (!--len || !strncmp(b+i,a+strlen(a)-len,len)); + } else + return FALSE; + } + } + + /* Ok, we know that b is a substring from A and does not contain + wildcards, but now the length of both strings must be the same, + too. In this case it means, a[i] has to be the end of the string. */ + if (a[i] != '\0') + return FALSE; + + return ( !len ); +} + +typedef struct { + int day; /* array of 7 bits, one set for today */ + int minute; /* integer, hour*100+minute for now */ +} TIME; + +static struct day { + const char *d; + int bit; +} const days[11] = { + { "su", 01 }, + { "mo", 02 }, + { "tu", 04 }, + { "we", 010 }, + { "th", 020 }, + { "fr", 040 }, + { "sa", 0100 }, + { "wk", 076 }, + { "wd", 0101 }, + { "al", 0177 }, + { NULL, 0 } +}; + +static TIME time_now(void) +{ + struct tm *local; + time_t the_time; + TIME this; + + the_time = time((time_t *)0); /* get the current time */ + local = localtime(&the_time); + this.day = days[local->tm_wday].bit; + this.minute = local->tm_hour*100 + local->tm_min; + + D(("day: 0%o, time: %.4d", this.day, this.minute)); + return this; +} + +/* take the current date and see if the range "date" passes it */ +static int +check_time (const pam_handle_t *pamh, const void *AT, + const char *times, int len, int rule) +{ + int not,pass; + int marked_day, time_start, time_end; + const TIME *at; + int i,j=0; + + at = AT; + D(("checking: 0%o/%.4d vs. %s", at->day, at->minute, times)); + + if (times == NULL) { + /* this should not happen */ + pam_syslog(pamh, LOG_CRIT, "internal error in file %s at line %d", + __FILE__, __LINE__); + return FALSE; + } + + if (times[j] == '!') { + ++j; + not = TRUE; + } else { + not = FALSE; + } + + for (marked_day = 0; len > 0 && isalpha(times[j]); --len) { + int this_day=-1; + + D(("%c%c ?", times[j], times[j+1])); + for (i=0; days[i].d != NULL; ++i) { + if (tolower(times[j]) == days[i].d[0] + && tolower(times[j+1]) == days[i].d[1] ) { + this_day = days[i].bit; + break; + } + } + j += 2; + if (this_day == -1) { + pam_syslog(pamh, LOG_ERR, "bad day specified (rule #%d)", rule); + return FALSE; + } + marked_day ^= this_day; + } + if (marked_day == 0) { + pam_syslog(pamh, LOG_ERR, "no day specified"); + return FALSE; + } + D(("day range = 0%o", marked_day)); + + time_start = 0; + for (i=0; len > 0 && i < 4 && isdigit(times[i+j]); ++i, --len) { + time_start *= 10; + time_start += times[i+j]-'0'; /* is this portable? */ + } + j += i; + + if (times[j] == '-') { + time_end = 0; + for (i=1; len > 0 && i < 5 && isdigit(times[i+j]); ++i, --len) { + time_end *= 10; + time_end += times[i+j]-'0'; /* is this portable? */ + } + j += i; + } else + time_end = -1; + + D(("i=%d, time_end=%d, times[j]='%c'", i, time_end, times[j])); + if (i != 5 || time_end == -1) { + pam_syslog(pamh, LOG_ERR, "no/bad times specified (rule #%d)", rule); + return TRUE; + } + D(("times(%d to %d)", time_start,time_end)); + D(("marked_day = 0%o", marked_day)); + + /* compare with the actual time now */ + + pass = FALSE; + if (time_start < time_end) { /* start < end ? --> same day */ + if ((at->day & marked_day) && (at->minute >= time_start) + && (at->minute < time_end)) { + D(("time is listed")); + pass = TRUE; + } + } else { /* spans two days */ + if ((at->day & marked_day) && (at->minute >= time_start)) { + D(("caught on first day")); + pass = TRUE; + } else { + marked_day <<= 1; + marked_day |= (marked_day & 0200) ? 1:0; + D(("next day = 0%o", marked_day)); + if ((at->day & marked_day) && (at->minute <= time_end)) { + D(("caught on second day")); + pass = TRUE; + } + } + } + + return (not ^ pass); +} + +static int find_member(const char *string, int *at) +{ + int c,to; + int done=0; + int token=0; + + to=*at; + do { + c = string[to++]; + + switch (c) { + + case '\0': + --to; + done = 1; + break; + + case '&': + case '|': + case '!': + if (token) { + --to; + } + done = 1; + break; + + default: + if (isalpha(c) || isdigit(c) || c == '_' || c == '*' + || c == '-') { + token = 1; + } else if (token) { + --to; + done = 1; + } else { + ++*at; + } + } + } while (!done); + + return to - *at; +} + +#define GROUP_BLK 10 +#define blk_size(len) (((len-1 + GROUP_BLK)/GROUP_BLK)*GROUP_BLK) + +static int mkgrplist(pam_handle_t *pamh, char *buf, gid_t **list, int len) +{ + int l,at=0; + int blks; + + blks = blk_size(len); + D(("cf. blks=%d and len=%d", blks,len)); + + while ((l = find_member(buf,&at))) { + int edge; + + if (len >= blks) { + gid_t *tmp; + + D(("allocating new block")); + tmp = (gid_t *) realloc((*list) + , sizeof(gid_t) * (blks += GROUP_BLK)); + if (tmp != NULL) { + (*list) = tmp; + } else { + pam_syslog(pamh, LOG_ERR, "out of memory for group list"); + free(*list); + (*list) = NULL; + return -1; + } + } + + /* '\0' terminate the entry */ + + edge = (buf[at+l]) ? 1:0; + buf[at+l] = '\0'; + D(("found group: %s",buf+at)); + + /* this is where we convert a group name to a gid_t */ + { + const struct group *grp; + + grp = pam_modutil_getgrnam(pamh, buf+at); + if (grp == NULL) { + pam_syslog(pamh, LOG_ERR, "bad group: %s", buf+at); + } else { + D(("group %s exists", buf+at)); + (*list)[len++] = grp->gr_gid; + } + } + + /* next entry along */ + + at += l + edge; + } + D(("returning with [%p/len=%d]->%p",list,len,*list)); + return len; +} + + +static int check_account(pam_handle_t *pamh, const char *service, + const char *tty, const char *user) +{ + int from=0, state=STATE_NL, fd=-1; + char *buffer=NULL; + int count=0; + TIME here_and_now; + int retval=PAM_SUCCESS; + gid_t *grps; + int no_grps; + + /* + * first we get the current list of groups - the application + * will have previously done an initgroups(), or equivalent. + */ + + D(("counting supplementary groups")); + no_grps = getgroups(0, NULL); /* find the current number of groups */ + if (no_grps > 0) { + grps = calloc( blk_size(no_grps) , sizeof(gid_t) ); + D(("copying current list into grps [%d big]",blk_size(no_grps))); + if (getgroups(no_grps, grps) < 0) { + D(("getgroups call failed")); + no_grps = 0; + _pam_drop(grps); + } +#ifdef PAM_DEBUG + { + int z; + for (z=0; z<no_grps; ++z) { + D(("gid[%d]=%d", z, grps[z])); + } + } +#endif + } else { + D(("no supplementary groups known")); + no_grps = 0; + grps = NULL; + } + + here_and_now = time_now(); /* find current time */ + + /* parse the rules in the configuration file */ + do { + int good=TRUE; + + /* here we get the service name field */ + + fd = read_field(pamh, fd, &buffer, &from, &state); + if (!buffer || !buffer[0]) { + /* empty line .. ? */ + continue; + } + ++count; + D(("working on rule #%d",count)); + + if (state != STATE_FIELD) { + pam_syslog(pamh, LOG_ERR, + "%s: malformed rule #%d", PAM_GROUP_CONF, count); + continue; + } + + good = logic_field(pamh,service, buffer, count, is_same); + D(("with service: %s", good ? "passes":"fails" )); + + /* here we get the terminal name field */ + + fd = read_field(pamh, fd, &buffer, &from, &state); + if (state != STATE_FIELD) { + pam_syslog(pamh, LOG_ERR, + "%s: malformed rule #%d", PAM_GROUP_CONF, count); + continue; + } + good &= logic_field(pamh,tty, buffer, count, is_same); + D(("with tty: %s", good ? "passes":"fails" )); + + /* here we get the username field */ + + fd = read_field(pamh, fd, &buffer, &from, &state); + if (state != STATE_FIELD) { + pam_syslog(pamh, LOG_ERR, + "%s: malformed rule #%d", PAM_GROUP_CONF, count); + continue; + } + /* If buffer starts with @, we are using netgroups */ + if (buffer[0] == '@') +#ifdef HAVE_INNETGR + good &= innetgr (&buffer[1], NULL, user, NULL); +#else + pam_syslog (pamh, LOG_ERR, "pam_group does not have netgroup support"); +#endif + /* otherwise, if the buffer starts with %, it's a UNIX group */ + else if (buffer[0] == '%') + good &= pam_modutil_user_in_group_nam_nam(pamh, user, &buffer[1]); + else + good &= logic_field(pamh,user, buffer, count, is_same); + D(("with user: %s", good ? "passes":"fails" )); + + /* here we get the time field */ + + fd = read_field(pamh, fd, &buffer, &from, &state); + if (state != STATE_FIELD) { + pam_syslog(pamh, LOG_ERR, + "%s: malformed rule #%d", PAM_GROUP_CONF, count); + continue; + } + + good &= logic_field(pamh,&here_and_now, buffer, count, check_time); + D(("with time: %s", good ? "passes":"fails" )); + + fd = read_field(pamh, fd, &buffer, &from, &state); + if (state == STATE_FIELD) { + pam_syslog(pamh, LOG_ERR, + "%s: poorly terminated rule #%d", PAM_GROUP_CONF, count); + continue; + } + + /* + * so we have a list of groups, we need to turn it into + * something to send to setgroups(2) + */ + + if (good) { + D(("adding %s to gid list", buffer)); + good = mkgrplist(pamh, buffer, &grps, no_grps); + if (good < 0) { + no_grps = 0; + } else { + no_grps = good; + } + } + + if (good > 0) { + D(("rule #%d passed, added %d groups", count, good)); + } else if (good < 0) { + retval = PAM_BUF_ERR; + } else { + D(("rule #%d failed", count)); + } + + } while (state != STATE_EOF); + + /* now set the groups for the user */ + + if (no_grps > 0) { +#ifdef PAM_DEBUG + int err; +#endif + D(("trying to set %d groups", no_grps)); +#ifdef PAM_DEBUG + for (err=0; err<no_grps; ++err) { + D(("gid[%d]=%d", err, grps[err])); + } +#endif + if (setgroups(no_grps, grps) != 0) { + D(("but couldn't set groups %m")); + pam_syslog(pamh, LOG_ERR, + "unable to set the group membership for user: %m"); + retval = PAM_CRED_ERR; + } + } + + if (grps) { /* tidy up */ + memset(grps, 0, sizeof(gid_t) * blk_size(no_grps)); + _pam_drop(grps); + no_grps = 0; + } + + return retval; +} + +/* --- public authentication management functions --- */ + +int +pam_sm_authenticate (pam_handle_t *pamh UNUSED, int flags UNUSED, + int argc UNUSED, const char **argv UNUSED) +{ + return PAM_IGNORE; +} + +int +pam_sm_setcred (pam_handle_t *pamh, int flags, + int argc UNUSED, const char **argv UNUSED) +{ + const void *service=NULL, *void_tty=NULL; + const char *user=NULL; + const char *tty; + int retval; + unsigned setting; + + /* only interested in establishing credentials */ + + setting = flags; + if (!(setting & (PAM_ESTABLISH_CRED | PAM_REINITIALIZE_CRED))) { + D(("ignoring call - not for establishing credentials")); + return PAM_SUCCESS; /* don't fail because of this */ + } + + /* set service name */ + + if (pam_get_item(pamh, PAM_SERVICE, &service) + != PAM_SUCCESS || service == NULL) { + pam_syslog(pamh, LOG_ERR, "cannot find the current service name"); + return PAM_ABORT; + } + + /* set username */ + + if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || *user == '\0') { + pam_syslog(pamh, LOG_NOTICE, "cannot determine user name"); + return PAM_USER_UNKNOWN; + } + + /* set tty name */ + + if (pam_get_item(pamh, PAM_TTY, &void_tty) != PAM_SUCCESS + || void_tty == NULL) { + D(("PAM_TTY not set, probing stdin")); + tty = ttyname(STDIN_FILENO); + if (tty == NULL) { + tty = ""; + } + if (pam_set_item(pamh, PAM_TTY, tty) != PAM_SUCCESS) { + pam_syslog(pamh, LOG_ERR, "couldn't set tty name"); + return PAM_ABORT; + } + } + else + tty = (const char *) void_tty; + + if (tty[0] == '/') { /* full path */ + const char *t; + tty++; + if ((t = strchr(tty, '/')) != NULL) { + tty = t + 1; + } + } + + /* good, now we have the service name, the user and the terminal name */ + + D(("service=%s", service)); + D(("user=%s", user)); + D(("tty=%s", tty)); + + retval = check_account(pamh,service,tty,user); /* get groups */ + + return retval; +} + +/* end of module definition */ diff --git a/modules/pam_group/tst-pam_group b/modules/pam_group/tst-pam_group new file mode 100755 index 00000000..29f7ba06 --- /dev/null +++ b/modules/pam_group/tst-pam_group @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_group.so |