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-rw-r--r--modules/pam_group/Makefile.am35
-rw-r--r--modules/pam_group/Makefile.in1221
-rw-r--r--modules/pam_group/README52
-rw-r--r--modules/pam_group/README.xml34
-rw-r--r--modules/pam_group/group.conf106
-rw-r--r--modules/pam_group/group.conf.5121
-rw-r--r--modules/pam_group/group.conf.5.xml147
-rw-r--r--modules/pam_group/pam_group.8109
-rw-r--r--modules/pam_group/pam_group.8.xml162
-rw-r--r--modules/pam_group/pam_group.c815
-rwxr-xr-xmodules/pam_group/tst-pam_group2
11 files changed, 2804 insertions, 0 deletions
diff --git a/modules/pam_group/Makefile.am b/modules/pam_group/Makefile.am
new file mode 100644
index 0000000..a9a0a1e
--- /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 0000000..6d916f1
--- /dev/null
+++ b/modules/pam_group/Makefile.in
@@ -0,0 +1,1221 @@
+# Makefile.in generated by automake 1.16.3 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2020 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
+@SET_MAKE@
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+ exit $$?;
+recheck: all $(dist_check_SCRIPTS)
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+distdir: $(BUILT_SOURCES)
+ $(MAKE) $(AM_MAKEFLAGS) distdir-am
+
+distdir-am: $(DISTFILES)
+ @srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
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+ dist_files=`for file in $$list; do echo $$file; done | \
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+ -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
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+ */*) $(MKDIR_P) `echo "$$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 \
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+ find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
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+ if test -d $(srcdir)/$$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" \
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+ done
+check-am: all-am
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+ done
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+ $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
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+ 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
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+clean-generic:
+ -test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
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+ -test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
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+ @echo "it deletes files that may require special tools to rebuild."
+ -test -z "$(MAINTAINERCLEANFILES)" || rm -f $(MAINTAINERCLEANFILES)
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+clean-am: clean-generic clean-libtool clean-securelibLTLIBRARIES \
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+distclean: distclean-am
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+@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules
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+# Otherwise a system limit (for SysV at least) may be exceeded.
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diff --git a/modules/pam_group/README b/modules/pam_group/README
new file mode 100644
index 0000000..9d6d097
--- /dev/null
+++ b/modules/pam_group/README
@@ -0,0 +1,52 @@
+pam_group — PAM module for group access
+
+━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+
+DESCRIPTION
+
+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.
+
+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 0000000..387d698
--- /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 0000000..7c07a26
--- /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 0000000..bbbe307
--- /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: 09/03/2021
+.\" Manual: Linux-PAM Manual
+.\" Source: Linux-PAM Manual
+.\" Language: English
+.\"
+.TH "GROUP\&.CONF" "5" "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"
+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 0000000..2b7fb34
--- /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 '&amp;' (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*&amp;!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 &lt;morgan@kernel.org&gt;.
+ </para>
+ </refsect1>
+</refentry>
diff --git a/modules/pam_group/pam_group.8 b/modules/pam_group/pam_group.8
new file mode 100644
index 0000000..77c7341
--- /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: 09/03/2021
+.\" Manual: Linux-PAM Manual
+.\" Source: Linux-PAM Manual
+.\" Language: English
+.\"
+.TH "PAM_GROUP" "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_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 0000000..2c1c905
--- /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 &lt;morgan@kernel.org&gt;.
+ </para>
+ </refsect1>
+</refentry>
diff --git a/modules/pam_group/pam_group.c b/modules/pam_group/pam_group.c
new file mode 100644
index 0000000..d9a35ea
--- /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 0000000..29f7ba0
--- /dev/null
+++ b/modules/pam_group/tst-pam_group
@@ -0,0 +1,2 @@
+#!/bin/sh
+../../tests/tst-dlopen .libs/pam_group.so
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-21 14:20:20 +0000