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-rw-r--r--modules/pam_wheel/Makefile.am31
-rw-r--r--modules/pam_wheel/Makefile.in1114
-rw-r--r--modules/pam_wheel/README61
-rw-r--r--modules/pam_wheel/README.xml41
-rw-r--r--modules/pam_wheel/pam_wheel.8147
-rw-r--r--modules/pam_wheel/pam_wheel.8.xml243
-rw-r--r--modules/pam_wheel/pam_wheel.c300
-rwxr-xr-xmodules/pam_wheel/tst-pam_wheel2
8 files changed, 1939 insertions, 0 deletions
diff --git a/modules/pam_wheel/Makefile.am b/modules/pam_wheel/Makefile.am
new file mode 100644
index 0000000..0042ca8
--- /dev/null
+++ b/modules/pam_wheel/Makefile.am
@@ -0,0 +1,31 @@
+#
+# Copyright (c) 2005, 2006, 2009 Thorsten Kukuk <kukuk@suse.de>
+#
+
+CLEANFILES = *~
+MAINTAINERCLEANFILES = $(MANS) README
+
+EXTRA_DIST = README ${MANS} $(XMLS) tst-pam_wheel
+
+man_MANS = pam_wheel.8
+XMLS = README.xml pam_wheel.8.xml
+
+TESTS = tst-pam_wheel
+
+securelibdir = $(SECUREDIR)
+secureconfdir = $(SCONFIGDIR)
+
+AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include
+AM_LDFLAGS = -no-undefined -avoid-version -module
+if HAVE_VERSIONING
+ AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map
+endif
+
+securelib_LTLIBRARIES = pam_wheel.la
+pam_wheel_la_LIBADD = $(top_builddir)/libpam/libpam.la
+
+if ENABLE_REGENERATE_MAN
+noinst_DATA = README
+README: pam_wheel.8.xml
+-include $(top_srcdir)/Make.xml.rules
+endif
diff --git a/modules/pam_wheel/Makefile.in b/modules/pam_wheel/Makefile.in
new file mode 100644
index 0000000..8dc8809
--- /dev/null
+++ b/modules/pam_wheel/Makefile.in
@@ -0,0 +1,1114 @@
+# Makefile.in generated by automake 1.13.4 from Makefile.am.
+# @configure_input@
+
+# Copyright (C) 1994-2013 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
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+# 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.
+
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+ dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
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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 $$d != $(srcdir); then \
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+ fi; \
+ cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+ else \
+ test -f "$(distdir)/$$file" \
+ || cp -p $$d/$$file "$(distdir)/$$file" \
+ || exit 1; \
+ fi; \
+ done
+check-am: all-am
+ $(MAKE) $(AM_MAKEFLAGS) check-TESTS
+check: check-am
+all-am: Makefile $(LTLIBRARIES) $(MANS) $(DATA)
+installdirs:
+ for dir in "$(DESTDIR)$(securelibdir)" "$(DESTDIR)$(man8dir)"; do \
+ test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+ done
+install: install-am
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+install-data: install-data-am
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+
+install-am: all-am
+ @$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
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+installcheck: installcheck-am
+install-strip:
+ if test -z '$(STRIP)'; then \
+ $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+ install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
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+ $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+ install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+ "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+ fi
+mostlyclean-generic:
+ -test -z "$(TEST_LOGS)" || rm -f $(TEST_LOGS)
+ -test -z "$(TEST_LOGS:.log=.trs)" || rm -f $(TEST_LOGS:.log=.trs)
+ -test -z "$(TEST_SUITE_LOG)" || rm -f $(TEST_SUITE_LOG)
+
+clean-generic:
+ -test -z "$(CLEANFILES)" || rm -f $(CLEANFILES)
+
+distclean-generic:
+ -test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+ -test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+ @echo "This command is intended for maintainers to use"
+ @echo "it deletes files that may require special tools to rebuild."
+ -test -z "$(MAINTAINERCLEANFILES)" || rm -f $(MAINTAINERCLEANFILES)
+clean: clean-am
+
+clean-am: clean-generic clean-libtool clean-securelibLTLIBRARIES \
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+distclean: distclean-am
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+ distclean-tags
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+dvi: dvi-am
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+dvi-am:
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+
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+
+.PHONY: CTAGS GTAGS TAGS all all-am check check-TESTS check-am clean \
+ clean-generic clean-libtool clean-securelibLTLIBRARIES \
+ cscopelist-am ctags ctags-am distclean distclean-compile \
+ distclean-generic distclean-libtool distclean-tags distdir dvi \
+ dvi-am html html-am info info-am install install-am \
+ install-data install-data-am install-dvi install-dvi-am \
+ install-exec install-exec-am install-html install-html-am \
+ install-info install-info-am install-man install-man8 \
+ install-pdf install-pdf-am install-ps install-ps-am \
+ install-securelibLTLIBRARIES install-strip installcheck \
+ installcheck-am installdirs maintainer-clean \
+ maintainer-clean-generic mostlyclean mostlyclean-compile \
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+ uninstall-man8 uninstall-securelibLTLIBRARIES
+
+@ENABLE_REGENERATE_MAN_TRUE@README: pam_wheel.8.xml
+@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/modules/pam_wheel/README b/modules/pam_wheel/README
new file mode 100644
index 0000000..ce12357
--- /dev/null
+++ b/modules/pam_wheel/README
@@ -0,0 +1,61 @@
+pam_wheel — Only permit root access to members of group wheel
+
+━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+
+DESCRIPTION
+
+The pam_wheel PAM module is used to enforce the so-called wheel group. By
+default it permits root access to the system if the applicant user is a member
+of the wheel group. If no group with this name exist, the module is using the
+group with the group-ID 0.
+
+OPTIONS
+
+debug
+
+ Print debug information.
+
+deny
+
+ Reverse the sense of the auth operation: if the user is trying to get UID 0
+ access and is a member of the wheel group (or the group of the group
+ option), deny access. Conversely, if the user is not in the group, return
+ PAM_IGNORE (unless trust was also specified, in which case we return
+ PAM_SUCCESS).
+
+group=name
+
+ Instead of checking the wheel or GID 0 groups, use the name group to
+ perform the authentication.
+
+root_only
+
+ The check for wheel membership is done only when the target user UID is 0.
+
+trust
+
+ The pam_wheel module will return PAM_SUCCESS instead of PAM_IGNORE if the
+ user is a member of the wheel group (thus with a little play stacking the
+ modules the wheel members may be able to su to root without being prompted
+ for a passwd).
+
+use_uid
+
+ The check for wheel membership will be done against the current uid instead
+ of the original one (useful when jumping with su from one account to
+ another for example).
+
+EXAMPLES
+
+The root account gains access by default (rootok), only wheel members can
+become root (wheel) but Unix authenticate non-root applicants.
+
+su auth sufficient pam_rootok.so
+su auth required pam_wheel.so
+su auth required pam_unix.so
+
+
+AUTHOR
+
+pam_wheel was written by Cristian Gafton <gafton@redhat.com>.
+
diff --git a/modules/pam_wheel/README.xml b/modules/pam_wheel/README.xml
new file mode 100644
index 0000000..9e33d7f
--- /dev/null
+++ b/modules/pam_wheel/README.xml
@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding='UTF-8'?>
+<!DOCTYPE article PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
+"http://www.docbook.org/xml/4.3/docbookx.dtd"
+[
+<!--
+<!ENTITY pamaccess SYSTEM "pam_wheel.8.xml">
+-->
+]>
+
+<article>
+
+ <articleinfo>
+
+ <title>
+ <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+ href="pam_wheel.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_wheel-name"]/*)'/>
+ </title>
+
+ </articleinfo>
+
+ <section>
+ <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+ href="pam_wheel.8.xml" xpointer='xpointer(//refsect1[@id = "pam_wheel-description"]/*)'/>
+ </section>
+
+ <section>
+ <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+ href="pam_wheel.8.xml" xpointer='xpointer(//refsect1[@id = "pam_wheel-options"]/*)'/>
+ </section>
+
+ <section>
+ <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+ href="pam_wheel.8.xml" xpointer='xpointer(//refsect1[@id = "pam_wheel-examples"]/*)'/>
+ </section>
+
+ <section>
+ <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+ href="pam_wheel.8.xml" xpointer='xpointer(//refsect1[@id = "pam_wheel-author"]/*)'/>
+ </section>
+
+</article>
diff --git a/modules/pam_wheel/pam_wheel.8 b/modules/pam_wheel/pam_wheel.8
new file mode 100644
index 0000000..d59ee46
--- /dev/null
+++ b/modules/pam_wheel/pam_wheel.8
@@ -0,0 +1,147 @@
+'\" t
+.\" Title: pam_wheel
+.\" Author: [see the "AUTHOR" section]
+.\" Generator: DocBook XSL Stylesheets v1.78.1 <http://docbook.sf.net/>
+.\" Date: 05/18/2017
+.\" Manual: Linux-PAM Manual
+.\" Source: Linux-PAM Manual
+.\" Language: English
+.\"
+.TH "PAM_WHEEL" "8" "05/18/2017" "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_wheel \- Only permit root access to members of group wheel
+.SH "SYNOPSIS"
+.HP \w'\fBpam_wheel\&.so\fR\ 'u
+\fBpam_wheel\&.so\fR [debug] [deny] [group=\fIname\fR] [root_only] [trust] [use_uid]
+.SH "DESCRIPTION"
+.PP
+The pam_wheel PAM module is used to enforce the so\-called
+\fIwheel\fR
+group\&. By default it permits root access to the system if the applicant user is a member of the
+\fIwheel\fR
+group\&. If no group with this name exist, the module is using the group with the group\-ID
+\fB0\fR\&.
+.SH "OPTIONS"
+.PP
+\fBdebug\fR
+.RS 4
+Print debug information\&.
+.RE
+.PP
+\fBdeny\fR
+.RS 4
+Reverse the sense of the auth operation: if the user is trying to get UID 0 access and is a member of the wheel group (or the group of the
+\fBgroup\fR
+option), deny access\&. Conversely, if the user is not in the group, return PAM_IGNORE (unless
+\fBtrust\fR
+was also specified, in which case we return PAM_SUCCESS)\&.
+.RE
+.PP
+\fBgroup=\fR\fB\fIname\fR\fR
+.RS 4
+Instead of checking the wheel or GID 0 groups, use the
+\fB\fIname\fR\fR
+group to perform the authentication\&.
+.RE
+.PP
+\fBroot_only\fR
+.RS 4
+The check for wheel membership is done only when the target user UID is 0\&.
+.RE
+.PP
+\fBtrust\fR
+.RS 4
+The pam_wheel module will return PAM_SUCCESS instead of PAM_IGNORE if the user is a member of the wheel group (thus with a little play stacking the modules the wheel members may be able to su to root without being prompted for a passwd)\&.
+.RE
+.PP
+\fBuse_uid\fR
+.RS 4
+The check for wheel membership will be done against the current uid instead of the original one (useful when jumping with su from one account to another for example)\&.
+.RE
+.SH "MODULE TYPES PROVIDED"
+.PP
+The
+\fBauth\fR
+and
+\fBaccount\fR
+module types are provided\&.
+.SH "RETURN VALUES"
+.PP
+PAM_AUTH_ERR
+.RS 4
+Authentication failure\&.
+.RE
+.PP
+PAM_BUF_ERR
+.RS 4
+Memory buffer error\&.
+.RE
+.PP
+PAM_IGNORE
+.RS 4
+The return value should be ignored by PAM dispatch\&.
+.RE
+.PP
+PAM_PERM_DENY
+.RS 4
+Permission denied\&.
+.RE
+.PP
+PAM_SERVICE_ERR
+.RS 4
+Cannot determine the user name\&.
+.RE
+.PP
+PAM_SUCCESS
+.RS 4
+Success\&.
+.RE
+.PP
+PAM_USER_UNKNOWN
+.RS 4
+User not known\&.
+.RE
+.SH "EXAMPLES"
+.PP
+The root account gains access by default (rootok), only wheel members can become root (wheel) but Unix authenticate non\-root applicants\&.
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+su auth sufficient pam_rootok\&.so
+su auth required pam_wheel\&.so
+su auth required pam_unix\&.so
+
+.fi
+.if n \{\
+.RE
+.\}
+.sp
+.SH "SEE ALSO"
+.PP
+\fBpam.conf\fR(5),
+\fBpam.d\fR(5),
+\fBpam\fR(8)
+.SH "AUTHOR"
+.PP
+pam_wheel was written by Cristian Gafton <gafton@redhat\&.com>\&.
diff --git a/modules/pam_wheel/pam_wheel.8.xml b/modules/pam_wheel/pam_wheel.8.xml
new file mode 100644
index 0000000..c8d9377
--- /dev/null
+++ b/modules/pam_wheel/pam_wheel.8.xml
@@ -0,0 +1,243 @@
+<?xml version="1.0" encoding='UTF-8'?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.3//EN"
+ "http://www.oasis-open.org/docbook/xml/4.3/docbookx.dtd">
+
+<refentry id="pam_wheel">
+
+ <refmeta>
+ <refentrytitle>pam_wheel</refentrytitle>
+ <manvolnum>8</manvolnum>
+ <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo>
+ </refmeta>
+
+ <refnamediv id="pam_wheel-name">
+ <refname>pam_wheel</refname>
+ <refpurpose>Only permit root access to members of group wheel</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <cmdsynopsis id="pam_wheel-cmdsynopsis">
+ <command>pam_wheel.so</command>
+ <arg choice="opt">
+ debug
+ </arg>
+ <arg choice="opt">
+ deny
+ </arg>
+ <arg choice="opt">
+ group=<replaceable>name</replaceable>
+ </arg>
+ <arg choice="opt">
+ root_only
+ </arg>
+ <arg choice="opt">
+ trust
+ </arg>
+ <arg choice="opt">
+ use_uid
+ </arg>
+ </cmdsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1 id="pam_wheel-description">
+ <title>DESCRIPTION</title>
+ <para>
+ The pam_wheel PAM module is used to enforce the so-called
+ <emphasis>wheel</emphasis> group. By default it permits root
+ access to the system if the applicant user is a member of the
+ <emphasis>wheel</emphasis> group. If no group with this name exist,
+ the module is using the group with the group-ID
+ <emphasis remap='B'>0</emphasis>.
+ </para>
+ </refsect1>
+
+ <refsect1 id="pam_wheel-options">
+ <title>OPTIONS</title>
+ <variablelist>
+ <varlistentry>
+ <term>
+ <option>debug</option>
+ </term>
+ <listitem>
+ <para>
+ Print debug information.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>deny</option>
+ </term>
+ <listitem>
+ <para>
+ Reverse the sense of the auth operation: if the user
+ is trying to get UID 0 access and is a member of the
+ wheel group (or the group of the <option>group</option> option),
+ deny access. Conversely, if the user is not in the group, return
+ PAM_IGNORE (unless <option>trust</option> was also specified,
+ in which case we return PAM_SUCCESS).
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>group=<replaceable>name</replaceable></option>
+ </term>
+ <listitem>
+ <para>
+ Instead of checking the wheel or GID 0 groups, use
+ the <option><replaceable>name</replaceable></option> group
+ to perform the authentication.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>root_only</option>
+ </term>
+ <listitem>
+ <para>
+ The check for wheel membership is done only when the target user
+ UID is 0.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>trust</option>
+ </term>
+ <listitem>
+ <para>
+ The pam_wheel module will return PAM_SUCCESS instead
+ of PAM_IGNORE if the user is a member of the wheel group
+ (thus with a little play stacking the modules the wheel
+ members may be able to su to root without being prompted
+ for a passwd).
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>use_uid</option>
+ </term>
+ <listitem>
+ <para>
+ The check for wheel membership will be done against
+ the current uid instead of the original one (useful when
+ jumping with su from one account to another for example).
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id="pam_wheel-types">
+ <title>MODULE TYPES PROVIDED</title>
+ <para>
+ The <emphasis remap='B'>auth</emphasis> and
+ <emphasis remap='B'>account</emphasis> module types are provided.
+ </para>
+ </refsect1>
+
+ <refsect1 id='pam_wheel-return_values'>
+ <title>RETURN VALUES</title>
+ <variablelist>
+ <varlistentry>
+ <term>PAM_AUTH_ERR</term>
+ <listitem>
+ <para>
+ Authentication failure.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_BUF_ERR</term>
+ <listitem>
+ <para>
+ Memory buffer error.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_IGNORE</term>
+ <listitem>
+ <para>
+ The return value should be ignored by PAM dispatch.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_PERM_DENY</term>
+ <listitem>
+ <para>
+ Permission denied.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_SERVICE_ERR</term>
+ <listitem>
+ <para>
+ Cannot determine the user name.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>PAM_SUCCESS</term>
+ <listitem>
+ <para>
+ Success.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>PAM_USER_UNKNOWN</term>
+ <listitem>
+ <para>
+ User not known.
+ </para>
+ </listitem>
+ </varlistentry>
+
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id='pam_wheel-examples'>
+ <title>EXAMPLES</title>
+ <para>
+ The root account gains access by default (rootok), only wheel
+ members can become root (wheel) but Unix authenticate non-root
+ applicants.
+ <programlisting>
+su auth sufficient pam_rootok.so
+su auth required pam_wheel.so
+su auth required pam_unix.so
+ </programlisting>
+ </para>
+ </refsect1>
+
+ <refsect1 id='pam_wheel-see_also'>
+ <title>SEE ALSO</title>
+ <para>
+ <citerefentry>
+ <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum>
+ </citerefentry>
+ </para>
+ </refsect1>
+
+ <refsect1 id='pam_wheel-author'>
+ <title>AUTHOR</title>
+ <para>
+ pam_wheel was written by Cristian Gafton &lt;gafton@redhat.com&gt;.
+ </para>
+ </refsect1>
+
+</refentry>
diff --git a/modules/pam_wheel/pam_wheel.c b/modules/pam_wheel/pam_wheel.c
new file mode 100644
index 0000000..6ea7b84
--- /dev/null
+++ b/modules/pam_wheel/pam_wheel.c
@@ -0,0 +1,300 @@
+/* pam_wheel module */
+
+/*
+ * Written by Cristian Gafton <gafton@redhat.com> 1996/09/10
+ * See the end of the file for Copyright Information
+ *
+ *
+ * 1.2 - added 'deny' and 'group=' options
+ * 1.1 - added 'trust' option
+ * 1.0 - the code is working for at least another person, so... :-)
+ * 0.1 - use vsyslog instead of vfprintf/syslog in _pam_log
+ * - return PAM_IGNORE on success (take care of sloppy sysadmins..)
+ * - use pam_get_user instead of pam_get_item(...,PAM_USER,...)
+ * - a new arg use_uid to auth the current uid instead of the
+ * initial (logged in) one.
+ * 0.0 - first release
+ *
+ * TODO:
+ * - try to use make_remark from pam_unix/support.c
+ * - consider returning on failure PAM_FAIL_NOW if the user is not
+ * a wheel member.
+ */
+
+#include "config.h"
+
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <syslog.h>
+#include <stdarg.h>
+#include <sys/types.h>
+#include <pwd.h>
+#include <grp.h>
+
+/*
+ * here, we make a definition for the externally accessible function
+ * in this file (this definition is required for static a module
+ * but strongly encouraged generally) it is used to instruct the
+ * modules include file to define the function prototypes.
+ */
+
+#define PAM_SM_AUTH
+#define PAM_SM_ACCOUNT
+
+#include <security/pam_modules.h>
+#include <security/pam_modutil.h>
+#include <security/pam_ext.h>
+
+/* checks if a user is on a list of members of the GID 0 group */
+static int is_on_list(char * const *list, const char *member)
+{
+ while (list && *list) {
+ if (strcmp(*list, member) == 0)
+ return 1;
+ list++;
+ }
+ return 0;
+}
+
+/* argument parsing */
+
+#define PAM_DEBUG_ARG 0x0001
+#define PAM_USE_UID_ARG 0x0002
+#define PAM_TRUST_ARG 0x0004
+#define PAM_DENY_ARG 0x0010
+#define PAM_ROOT_ONLY_ARG 0x0020
+
+static int
+_pam_parse (const pam_handle_t *pamh, int argc, const char **argv,
+ char *use_group, size_t group_length)
+{
+ int ctrl=0;
+
+ memset(use_group, '\0', group_length);
+
+ /* step through arguments */
+ for (ctrl=0; argc-- > 0; ++argv) {
+
+ /* generic options */
+
+ if (!strcmp(*argv,"debug"))
+ ctrl |= PAM_DEBUG_ARG;
+ else if (!strcmp(*argv,"use_uid"))
+ ctrl |= PAM_USE_UID_ARG;
+ else if (!strcmp(*argv,"trust"))
+ ctrl |= PAM_TRUST_ARG;
+ else if (!strcmp(*argv,"deny"))
+ ctrl |= PAM_DENY_ARG;
+ else if (!strcmp(*argv,"root_only"))
+ ctrl |= PAM_ROOT_ONLY_ARG;
+ else if (!strncmp(*argv,"group=",6))
+ strncpy(use_group,*argv+6,group_length-1);
+ else {
+ pam_syslog(pamh, LOG_ERR, "unknown option: %s", *argv);
+ }
+ }
+
+ return ctrl;
+}
+
+static int
+perform_check (pam_handle_t *pamh, int ctrl, const char *use_group)
+{
+ const char *username = NULL;
+ const char *fromsu;
+ struct passwd *pwd, *tpwd = NULL;
+ struct group *grp;
+ int retval = PAM_AUTH_ERR;
+
+ retval = pam_get_user(pamh, &username, NULL);
+ if ((retval != PAM_SUCCESS) || (!username)) {
+ if (ctrl & PAM_DEBUG_ARG) {
+ pam_syslog(pamh, LOG_DEBUG, "can not get the username");
+ }
+ return PAM_SERVICE_ERR;
+ }
+
+ pwd = pam_modutil_getpwnam (pamh, username);
+ if (!pwd) {
+ if (ctrl & PAM_DEBUG_ARG) {
+ pam_syslog(pamh, LOG_NOTICE, "unknown user %s", username);
+ }
+ return PAM_USER_UNKNOWN;
+ }
+ if (ctrl & PAM_ROOT_ONLY_ARG) {
+ /* su to a non uid 0 account ? */
+ if (pwd->pw_uid != 0) {
+ return PAM_IGNORE;
+ }
+ }
+
+ if (ctrl & PAM_USE_UID_ARG) {
+ tpwd = pam_modutil_getpwuid (pamh, getuid());
+ if (!tpwd) {
+ if (ctrl & PAM_DEBUG_ARG) {
+ pam_syslog(pamh, LOG_NOTICE, "who is running me ?!");
+ }
+ return PAM_SERVICE_ERR;
+ }
+ fromsu = tpwd->pw_name;
+ } else {
+ fromsu = pam_modutil_getlogin(pamh);
+ if (fromsu) {
+ tpwd = pam_modutil_getpwnam (pamh, fromsu);
+ }
+ if (!fromsu || !tpwd) {
+ if (ctrl & PAM_DEBUG_ARG) {
+ pam_syslog(pamh, LOG_NOTICE, "who is running me ?!");
+ }
+ return PAM_SERVICE_ERR;
+ }
+ }
+
+ /*
+ * At this point fromsu = username-of-invoker; tpwd = pwd ptr for fromsu
+ */
+
+ if (!use_group[0]) {
+ if ((grp = pam_modutil_getgrnam (pamh, "wheel")) == NULL) {
+ grp = pam_modutil_getgrgid (pamh, 0);
+ }
+ } else {
+ grp = pam_modutil_getgrnam (pamh, use_group);
+ }
+
+ if (!grp || (!grp->gr_mem && (tpwd->pw_gid != grp->gr_gid))) {
+ if (ctrl & PAM_DEBUG_ARG) {
+ if (!use_group[0]) {
+ pam_syslog(pamh, LOG_NOTICE, "no members in a GID 0 group");
+ } else {
+ pam_syslog(pamh, LOG_NOTICE,
+ "no members in '%s' group", use_group);
+ }
+ }
+ if (ctrl & PAM_DENY_ARG) {
+ /* if this was meant to deny access to the members
+ * of this group and the group does not exist, allow
+ * access
+ */
+ return PAM_IGNORE;
+ } else {
+ return PAM_AUTH_ERR;
+ }
+ }
+
+ /*
+ * test if the user is a member of the group, or if the
+ * user has the "wheel" (sic) group as its primary group.
+ */
+
+ if (is_on_list(grp->gr_mem, fromsu) || (tpwd->pw_gid == grp->gr_gid)) {
+
+ if (ctrl & PAM_DENY_ARG) {
+ retval = PAM_PERM_DENIED;
+
+ } else if (ctrl & PAM_TRUST_ARG) {
+ retval = PAM_SUCCESS; /* this can be a sufficient check */
+
+ } else {
+ retval = PAM_IGNORE;
+ }
+
+ } else {
+
+ if (ctrl & PAM_DENY_ARG) {
+
+ if (ctrl & PAM_TRUST_ARG) {
+ retval = PAM_SUCCESS; /* this can be a sufficient check */
+ } else {
+ retval = PAM_IGNORE;
+ }
+
+ } else {
+ retval = PAM_PERM_DENIED;
+ }
+ }
+
+ if (ctrl & PAM_DEBUG_ARG) {
+ if (retval == PAM_IGNORE) {
+ pam_syslog(pamh, LOG_NOTICE,
+ "Ignoring access request '%s' for '%s'",
+ fromsu, username);
+ } else {
+ pam_syslog(pamh, LOG_NOTICE, "Access %s to '%s' for '%s'",
+ (retval != PAM_SUCCESS) ? "denied":"granted",
+ fromsu, username);
+ }
+ }
+
+ return retval;
+}
+
+/* --- authentication management functions --- */
+
+int
+pam_sm_authenticate (pam_handle_t *pamh, int flags UNUSED,
+ int argc, const char **argv)
+{
+ char use_group[BUFSIZ];
+ int ctrl;
+
+ ctrl = _pam_parse(pamh, argc, argv, use_group, sizeof(use_group));
+
+ return perform_check(pamh, ctrl, use_group);
+}
+
+int
+pam_sm_setcred (pam_handle_t *pamh UNUSED, int flags UNUSED,
+ int argc UNUSED, const char **argv UNUSED)
+{
+ return PAM_SUCCESS;
+}
+
+int
+pam_sm_acct_mgmt (pam_handle_t *pamh, int flags UNUSED,
+ int argc, const char **argv)
+{
+ char use_group[BUFSIZ];
+ int ctrl;
+
+ ctrl = _pam_parse(pamh, argc, argv, use_group, sizeof(use_group));
+
+ return perform_check(pamh, ctrl, use_group);
+}
+
+/*
+ * Copyright (c) Cristian Gafton <gafton@redhat.com>, 1996, 1997
+ * All rights reserved
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, and the entire permission notice in its entirety,
+ * including the disclaimer of warranties.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. The name of the author may not be used to endorse or promote
+ * products derived from this software without specific prior
+ * written permission.
+ *
+ * ALTERNATIVELY, this product may be distributed under the terms of
+ * the GNU Public License, in which case the provisions of the GPL are
+ * required INSTEAD OF the above restrictions. (This clause is
+ * necessary due to a potential bad interaction between the GPL and
+ * the restrictions contained in a BSD-style copyright.)
+ *
+ * THIS SOFTWARE IS PROVIDED `AS IS'' AND ANY EXPRESS OR IMPLIED
+ * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
+ * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
+ * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+ * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
+ * OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
diff --git a/modules/pam_wheel/tst-pam_wheel b/modules/pam_wheel/tst-pam_wheel
new file mode 100755
index 0000000..4bf5d6a
--- /dev/null
+++ b/modules/pam_wheel/tst-pam_wheel
@@ -0,0 +1,2 @@
+#!/bin/sh
+../../tests/tst-dlopen .libs/pam_wheel.so
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-03 19:35:17 +0000