diff options
Diffstat (limited to 'modules/pam_tty_audit')
-rw-r--r-- | modules/pam_tty_audit/Makefile.am | 32 | ||||
-rw-r--r-- | modules/pam_tty_audit/Makefile.in | 1145 | ||||
-rw-r--r-- | modules/pam_tty_audit/README | 70 | ||||
-rw-r--r-- | modules/pam_tty_audit/README.xml | 41 | ||||
-rw-r--r-- | modules/pam_tty_audit/pam_tty_audit.8 | 135 | ||||
-rw-r--r-- | modules/pam_tty_audit/pam_tty_audit.8.xml | 199 | ||||
-rw-r--r-- | modules/pam_tty_audit/pam_tty_audit.c | 450 | ||||
-rwxr-xr-x | modules/pam_tty_audit/tst-pam_tty_audit | 2 |
8 files changed, 2074 insertions, 0 deletions
diff --git a/modules/pam_tty_audit/Makefile.am b/modules/pam_tty_audit/Makefile.am new file mode 100644 index 0000000..e774c57 --- /dev/null +++ b/modules/pam_tty_audit/Makefile.am @@ -0,0 +1,32 @@ +# +# Copyright (c) 2005, 2006, 2009, 2010 Thorsten Kukuk <kukuk@suse.de> +# + +CLEANFILES = *~ +MAINTAINERCLEANFILES = $(MANS) README + +EXTRA_DIST = $(XMLS) + +if HAVE_DOC +dist_man_MANS = pam_tty_audit.8 +endif +XMLS = README.xml pam_tty_audit.8.xml +dist_check_SCRIPTS = tst-pam_tty_audit +TESTS = $(dist_check_SCRIPTS) + +securelibdir = $(SECUREDIR) + +AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include \ + $(WARN_CFLAGS) +AM_LDFLAGS = -no-undefined -avoid-version -module +if HAVE_VERSIONING + AM_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map +endif + +pam_tty_audit_la_LIBADD = $(top_builddir)/libpam/libpam.la +securelib_LTLIBRARIES = pam_tty_audit.la + +if ENABLE_REGENERATE_MAN +dist_noinst_DATA = README +-include $(top_srcdir)/Make.xml.rules +endif diff --git a/modules/pam_tty_audit/Makefile.in b/modules/pam_tty_audit/Makefile.in new file mode 100644 index 0000000..4b1b0ae --- /dev/null +++ b/modules/pam_tty_audit/Makefile.in @@ -0,0 +1,1145 @@ +# 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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By +default, the kernel does not audit input on any TTY. + +OPTIONS + +disable=patterns + + For each user matching patterns, disable TTY auditing. This overrides any + previous enable option matching the same user name on the command line. See + NOTES for further description of patterns. + +enable=patterns + + For each user matching patterns, enable TTY auditing. This overrides any + previous disable option matching the same user name on the command line. + See NOTES for further description of patterns. + +open_only + + Set the TTY audit flag when opening the session, but do not restore it when + closing the session. Using this option is necessary for some services that + don't fork() to run the authenticated session, such as sudo. + +log_passwd + + Log keystrokes when ECHO mode is off but ICANON mode is active. This is the + mode in which the tty is placed during password entry. By default, + passwords are not logged. This option may not be available on older kernels + (3.9?). + +NOTES + +When TTY auditing is enabled, it is inherited by all processes started by that +user. In particular, daemons restarted by an user will still have TTY auditing +enabled, and audit TTY input even by other users unless auditing for these +users is explicitly disabled. Therefore, it is recommended to use disable=* as +the first option for most daemons using PAM. + +To view the data that was logged by the kernel to audit use the command +aureport --tty. + +The patterns are comma separated lists of glob patterns or ranges of uids. A +range is specified as min_uid:max_uid where one of these values can be empty. +If min_uid is empty only user with the uid max_uid will be matched. If max_uid +is empty users with the uid greater than or equal to min_uid will be matched. + +Please note that passwords in some circumstances may be logged by TTY auditing +even if the log_passwd is not used. For example, all input to an ssh session +will be logged - even if there is a password being typed into some software +running at the remote host because only the local TTY state affects the local +TTY auditing. + +EXAMPLES + +Audit all administrative actions. + +session required pam_tty_audit.so disable=* enable=root + + +AUTHOR + +pam_tty_audit was written by Miloslav Trmač <mitr@redhat.com>. The log_passwd +option was added by Richard Guy Briggs <rgb@redhat.com>. + diff --git a/modules/pam_tty_audit/README.xml b/modules/pam_tty_audit/README.xml new file mode 100644 index 0000000..4dad6bb --- /dev/null +++ b/modules/pam_tty_audit/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"> + +<article> + + <articleinfo> + + <title> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_tty_audit.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_tty_audit-name"]/*)'/> + </title> + + </articleinfo> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_tty_audit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_tty_audit-description"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_tty_audit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_tty_audit-options"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_tty_audit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_tty_audit-notes"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_tty_audit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_tty_audit-examples"]/*)'/> + </section> + + <section> + <xi:include xmlns:xi="http://www.w3.org/2001/XInclude" + href="pam_tty_audit.8.xml" xpointer='xpointer(//refsect1[@id = "pam_tty_audit-author"]/*)'/> + </section> + +</article> diff --git a/modules/pam_tty_audit/pam_tty_audit.8 b/modules/pam_tty_audit/pam_tty_audit.8 new file mode 100644 index 0000000..7ecfcdb --- /dev/null +++ b/modules/pam_tty_audit/pam_tty_audit.8 @@ -0,0 +1,135 @@ +'\" t +.\" Title: pam_tty_audit +.\" 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 "PAM_TTY_AUDIT" "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_tty_audit \- Enable or disable TTY auditing for specified users +.SH "SYNOPSIS" +.HP \w'\fBpam_tty_audit\&.so\fR\ 'u +\fBpam_tty_audit\&.so\fR [disable=\fIpatterns\fR] [enable=\fIpatterns\fR] +.SH "DESCRIPTION" +.PP +The pam_tty_audit PAM module is used to enable or disable TTY auditing\&. By default, the kernel does not audit input on any TTY\&. +.SH "OPTIONS" +.PP +\fBdisable=\fR\fB\fIpatterns\fR\fR +.RS 4 +For each user matching +\fB\fIpatterns\fR\fR, disable TTY auditing\&. This overrides any previous +\fBenable\fR +option matching the same user name on the command line\&. See NOTES for further description of +\fB\fIpatterns\fR\fR\&. +.RE +.PP +\fBenable=\fR\fB\fIpatterns\fR\fR +.RS 4 +For each user matching +\fB\fIpatterns\fR\fR, enable TTY auditing\&. This overrides any previous +\fBdisable\fR +option matching the same user name on the command line\&. See NOTES for further description of +\fB\fIpatterns\fR\fR\&. +.RE +.PP +\fBopen_only\fR +.RS 4 +Set the TTY audit flag when opening the session, but do not restore it when closing the session\&. Using this option is necessary for some services that don\*(Aqt +\fBfork()\fR +to run the authenticated session, such as +\fBsudo\fR\&. +.RE +.PP +\fBlog_passwd\fR +.RS 4 +Log keystrokes when ECHO mode is off but ICANON mode is active\&. This is the mode in which the tty is placed during password entry\&. By default, passwords are not logged\&. This option may not be available on older kernels (3\&.9?)\&. +.RE +.SH "MODULE TYPES PROVIDED" +.PP +Only the +\fBsession\fR +type is supported\&. +.SH "RETURN VALUES" +.PP +PAM_SESSION_ERR +.RS 4 +Error reading or modifying the TTY audit flag\&. See the system log for more details\&. +.RE +.PP +PAM_SUCCESS +.RS 4 +Success\&. +.RE +.SH "NOTES" +.PP +When TTY auditing is enabled, it is inherited by all processes started by that user\&. In particular, daemons restarted by an user will still have TTY auditing enabled, and audit TTY input even by other users unless auditing for these users is explicitly disabled\&. Therefore, it is recommended to use +\fBdisable=*\fR +as the first option for most daemons using PAM\&. +.PP +To view the data that was logged by the kernel to audit use the command +\fBaureport \-\-tty\fR\&. +.PP +The +\fB\fIpatterns\fR\fR +are comma separated lists of glob patterns or ranges of uids\&. A range is specified as +\fImin_uid\fR:\fImax_uid\fR +where one of these values can be empty\&. If +\fImin_uid\fR +is empty only user with the uid +\fImax_uid\fR +will be matched\&. If +\fImax_uid\fR +is empty users with the uid greater than or equal to +\fImin_uid\fR +will be matched\&. +.PP +Please note that passwords in some circumstances may be logged by TTY auditing even if the +\fBlog_passwd\fR +is not used\&. For example, all input to an ssh session will be logged \- even if there is a password being typed into some software running at the remote host because only the local TTY state affects the local TTY auditing\&. +.SH "EXAMPLES" +.PP +Audit all administrative actions\&. +.sp +.if n \{\ +.RS 4 +.\} +.nf +session required pam_tty_audit\&.so disable=* enable=root + +.fi +.if n \{\ +.RE +.\} +.sp +.SH "SEE ALSO" +.PP +\fBaureport\fR(8), +\fBpam.conf\fR(5), +\fBpam.d\fR(5), +\fBpam\fR(8) +.SH "AUTHOR" +.PP +pam_tty_audit was written by Miloslav Trmač <mitr@redhat\&.com>\&. The log_passwd option was added by Richard Guy Briggs <rgb@redhat\&.com>\&. diff --git a/modules/pam_tty_audit/pam_tty_audit.8.xml b/modules/pam_tty_audit/pam_tty_audit.8.xml new file mode 100644 index 0000000..e346c68 --- /dev/null +++ b/modules/pam_tty_audit/pam_tty_audit.8.xml @@ -0,0 +1,199 @@ +<?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_tty_audit"> + + <refmeta> + <refentrytitle>pam_tty_audit</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_tty_audit-name"> + <refname>pam_tty_audit</refname> + <refpurpose>Enable or disable TTY auditing for specified users</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_tty_audit-cmdsynopsis"> + <command>pam_tty_audit.so</command> + <arg choice="opt"> + disable=<replaceable>patterns</replaceable> + </arg> + <arg choice="opt"> + enable=<replaceable>patterns</replaceable> + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_tty_audit-description"> + <title>DESCRIPTION</title> + <para> + The pam_tty_audit PAM module is used to enable or disable TTY auditing. + By default, the kernel does not audit input on any TTY. + </para> + </refsect1> + + <refsect1 id="pam_tty_audit-options"> + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + <option>disable=<replaceable>patterns</replaceable></option> + </term> + <listitem> + <para> + For each user matching <option><replaceable>patterns</replaceable></option>, + disable TTY auditing. This overrides any previous <option>enable</option> + option matching the same user name on the command line. See NOTES + for further description of <option><replaceable>patterns</replaceable></option>. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>enable=<replaceable>patterns</replaceable></option> + </term> + <listitem> + <para> + For each user matching <option><replaceable>patterns</replaceable></option>, + enable TTY auditing. This overrides any previous <option>disable</option> + option matching the same user name on the command line. See NOTES + for further description of <option><replaceable>patterns</replaceable></option>. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>open_only</option> + </term> + <listitem> + <para> + Set the TTY audit flag when opening the session, but do not restore + it when closing the session. Using this option is necessary for + some services that don't <function>fork()</function> to run the + authenticated session, such as <command>sudo</command>. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>log_passwd</option> + </term> + <listitem> + <para> + Log keystrokes when ECHO mode is off but ICANON mode is active. + This is the mode in which the tty is placed during password entry. + By default, passwords are not logged. This option may not be + available on older kernels (3.9?). + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id="pam_tty_audit-types"> + <title>MODULE TYPES PROVIDED</title> + <para> + Only the <emphasis remap='B'>session</emphasis> type is supported. + </para> + </refsect1> + + <refsect1 id='pam_tty_audit-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_SESSION_ERR</term> + <listitem> + <para> + Error reading or modifying the TTY audit flag. See the system log + for more details. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term>PAM_SUCCESS</term> + <listitem> + <para> + Success. + </para> + </listitem> + </varlistentry> + + </variablelist> + </refsect1> + + <refsect1 id='pam_tty_audit-notes'> + <title>NOTES</title> + <para> + When TTY auditing is enabled, it is inherited by all processes started by + that user. In particular, daemons restarted by an user will still have + TTY auditing enabled, and audit TTY input even by other users unless + auditing for these users is explicitly disabled. Therefore, it is + recommended to use <option>disable=*</option> as the first option for + most daemons using PAM. + </para> + <para> + To view the data that was logged by the kernel to audit use + the command <command>aureport --tty</command>. + </para> + <para> + The <option><replaceable>patterns</replaceable></option> are comma separated + lists of glob patterns or ranges of uids. A range is specified as + <replaceable>min_uid</replaceable>:<replaceable>max_uid</replaceable> where + one of these values can be empty. If <replaceable>min_uid</replaceable> is + empty only user with the uid <replaceable>max_uid</replaceable> will be + matched. If <replaceable>max_uid</replaceable> is empty users with the uid + greater than or equal to <replaceable>min_uid</replaceable> will be + matched. + </para> + <para> + Please note that passwords in some circumstances may be logged by TTY auditing + even if the <option>log_passwd</option> is not used. For example, all input to + an ssh session will be logged - even if there is a password being typed into + some software running at the remote host because only the local TTY state + affects the local TTY auditing. + </para> + </refsect1> + + <refsect1 id='pam_tty_audit-examples'> + <title>EXAMPLES</title> + <para> + Audit all administrative actions. + <programlisting> +session required pam_tty_audit.so disable=* enable=root + </programlisting> + </para> + </refsect1> + + <refsect1 id='pam_tty_audit-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>aureport</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <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_tty_audit-author'> + <title>AUTHOR</title> + <para> + pam_tty_audit was written by Miloslav Trmač + <mitr@redhat.com>. + The log_passwd option was added by Richard Guy Briggs + <rgb@redhat.com>. + </para> + </refsect1> + +</refentry> diff --git a/modules/pam_tty_audit/pam_tty_audit.c b/modules/pam_tty_audit/pam_tty_audit.c new file mode 100644 index 0000000..15fb910 --- /dev/null +++ b/modules/pam_tty_audit/pam_tty_audit.c @@ -0,0 +1,450 @@ +/* Copyright © 2007, 2008 Red Hat, Inc. All rights reserved. + Red Hat author: Miloslav Trmač <mitr@redhat.com> + + Redistribution and use in source and binary forms of Linux-PAM, with + or without modification, are permitted provided that the following + conditions are met: + + 1. Redistributions of source code must retain any existing copyright + notice, and this entire permission notice in its entirety, + including the disclaimer of warranties. + + 2. Redistributions in binary form must reproduce all prior and current + copyright notices, this list of conditions, and the following + disclaimer in the documentation and/or other materials provided + with the distribution. + + 3. The name of any author may not be used to endorse or promote + products derived from this software without their specific prior + written permission. + + ALTERNATIVELY, this product may be distributed under the terms of the + GNU General Public License, in which case the provisions of the GNU + GPL are required INSTEAD OF the above restrictions. (This clause is + necessary due to a potential conflict between the GNU 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(S) 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. */ + +#include "config.h" +#include <errno.h> +#include <fnmatch.h> +#include <stdlib.h> +#include <string.h> +#include <syslog.h> +#include <sys/socket.h> +#include <unistd.h> + +#include <libaudit.h> +#include <linux/netlink.h> + +#include <security/pam_ext.h> +#include <security/pam_modules.h> +#include <security/pam_modutil.h> + +#include "pam_cc_compat.h" +#include "pam_inline.h" + +#define DATANAME "pam_tty_audit_last_state" + +/* Open an audit netlink socket */ +static int +nl_open (void) +{ + return socket (AF_NETLINK, SOCK_RAW, NETLINK_AUDIT); +} + +static int +nl_send (int fd, unsigned type, unsigned flags, const void *data, size_t size) +{ + struct sockaddr_nl addr; + struct msghdr msg; + struct nlmsghdr nlm; + struct iovec iov[2]; + ssize_t res; + + nlm.nlmsg_len = NLMSG_LENGTH (size); + nlm.nlmsg_type = type; + nlm.nlmsg_flags = NLM_F_REQUEST | flags; + nlm.nlmsg_seq = 0; + nlm.nlmsg_pid = 0; + iov[0].iov_base = &nlm; + iov[0].iov_len = sizeof (nlm); + DIAG_PUSH_IGNORE_CAST_QUAL; + iov[1].iov_base = (void *)data; + DIAG_POP_IGNORE_CAST_QUAL; + iov[1].iov_len = size; + addr.nl_family = AF_NETLINK; + addr.nl_pid = 0; + addr.nl_groups = 0; + msg.msg_name = &addr; + msg.msg_namelen = sizeof (addr); + msg.msg_iov = iov; + msg.msg_iovlen = 2; + msg.msg_control = NULL; + msg.msg_controllen = 0; + msg.msg_flags = 0; + res = sendmsg (fd, &msg, 0); + if (res == -1) + return -1; + if ((size_t)res != nlm.nlmsg_len) + { + errno = EIO; + return -1; + } + return 0; +} + +static int +nl_recv (int fd, unsigned type, void *buf, size_t size) +{ + struct sockaddr_nl addr; + struct msghdr msg; + struct nlmsghdr nlm; + struct iovec iov[2]; + ssize_t res, resdiff; + + again: + iov[0].iov_base = &nlm; + iov[0].iov_len = sizeof (nlm); + msg.msg_name = &addr; + msg.msg_namelen = sizeof (addr); + msg.msg_iov = iov; + msg.msg_iovlen = 1; + msg.msg_control = NULL; + msg.msg_controllen = 0; + msg.msg_flags = 0; + if (type != NLMSG_ERROR) + { + res = recvmsg (fd, &msg, MSG_PEEK); + if (res == -1) + return -1; + if (res != NLMSG_LENGTH (0)) + { + errno = EIO; + return -1; + } + if (nlm.nlmsg_type == NLMSG_ERROR) + { + struct nlmsgerr err; + + iov[1].iov_base = &err; + iov[1].iov_len = sizeof (err); + msg.msg_iovlen = 2; + res = recvmsg (fd, &msg, 0); + if (res == -1) + return -1; + if ((size_t)res != NLMSG_LENGTH (sizeof (err)) + || nlm.nlmsg_type != NLMSG_ERROR) + { + errno = EIO; + return -1; + } + if (err.error == 0) + goto again; + errno = -err.error; + return -1; + } + } + if (size != 0) + { + iov[1].iov_base = buf; + iov[1].iov_len = size; + msg.msg_iovlen = 2; + } + res = recvmsg (fd, &msg, 0); + if (res == -1) + return -1; + resdiff = NLMSG_LENGTH(size) - (size_t)res; + if (resdiff < 0 + || nlm.nlmsg_type != type) + { + errno = EIO; + return -1; + } + else if (resdiff > 0) + { + memset((char *)buf + size - resdiff, 0, resdiff); + } + return 0; +} + +static int +nl_recv_ack (int fd) +{ + struct nlmsgerr err; + + if (nl_recv (fd, NLMSG_ERROR, &err, sizeof (err)) != 0) + return -1; + if (err.error != 0) + { + errno = -err.error; + return -1; + } + return 0; +} + +static void +cleanup_old_status (pam_handle_t *pamh, void *data, int error_status) +{ + (void)pamh; + (void)error_status; + free (data); +} + +enum uid_range { UID_RANGE_NONE, UID_RANGE_MM, UID_RANGE_MIN, + UID_RANGE_ONE, UID_RANGE_ERR }; + +static enum uid_range +parse_uid_range(pam_handle_t *pamh, const char *s, + uid_t *min_uid, uid_t *max_uid) +{ + const char *range = s; + const char *pmax; + char *endptr; + enum uid_range rv = UID_RANGE_MM; + + if ((pmax=strchr(range, ':')) == NULL) + return UID_RANGE_NONE; + ++pmax; + + if (range[0] == ':') + rv = UID_RANGE_ONE; + else { + errno = 0; + *min_uid = strtoul (range, &endptr, 10); + if (errno != 0 || (range == endptr) || *endptr != ':') { + pam_syslog(pamh, LOG_DEBUG, + "wrong min_uid value in '%s'", s); + return UID_RANGE_ERR; + } + } + + if (*pmax == '\0') { + if (rv == UID_RANGE_ONE) + return UID_RANGE_ERR; + + return UID_RANGE_MIN; + } + + errno = 0; + *max_uid = strtoul (pmax, &endptr, 10); + if (errno != 0 || (pmax == endptr) || *endptr != '\0') { + pam_syslog(pamh, LOG_DEBUG, + "wrong max_uid value in '%s'", s); + return UID_RANGE_ERR; + } + + if (rv == UID_RANGE_ONE) + *min_uid = *max_uid; + return rv; +} + +int +pam_sm_open_session (pam_handle_t *pamh, int flags, int argc, const char **argv) +{ + enum command { CMD_NONE, CMD_ENABLE, CMD_DISABLE }; + + enum command command; + struct audit_tty_status *old_status, new_status; + const char *user; + int i, fd, open_only; + struct passwd *pwd; +#ifdef HAVE_STRUCT_AUDIT_TTY_STATUS_LOG_PASSWD + int log_passwd; +#endif /* HAVE_STRUCT_AUDIT_TTY_STATUS_LOG_PASSWD */ + + (void)flags; + + if (pam_get_user (pamh, &user, NULL) != PAM_SUCCESS) + { + pam_syslog(pamh, LOG_NOTICE, "cannot determine user name"); + return PAM_SESSION_ERR; + } + + pwd = pam_modutil_getpwnam(pamh, user); + if (pwd == NULL) + { + pam_syslog(pamh, LOG_NOTICE, + "open_session unknown user '%s'", user); + return PAM_SESSION_ERR; + } + + command = CMD_NONE; + open_only = 0; +#ifdef HAVE_STRUCT_AUDIT_TTY_STATUS_LOG_PASSWD + log_passwd = 0; +#endif /* HAVE_STRUCT_AUDIT_TTY_STATUS_LOG_PASSWD */ + for (i = 0; i < argc; i++) + { + const char *str; + + if ((str = pam_str_skip_prefix(argv[i], "enable=")) != NULL + || (str = pam_str_skip_prefix(argv[i], "disable=")) != NULL) + { + enum command this_command; + char *copy, *tok_data, *tok; + + this_command = *argv[i] == 'e' ? CMD_ENABLE : CMD_DISABLE; + copy = strdup (str); + if (copy == NULL) + return PAM_SESSION_ERR; + for (tok = strtok_r (copy, ",", &tok_data); + tok != NULL && command != this_command; + tok = strtok_r (NULL, ",", &tok_data)) + { + uid_t min_uid = 0, max_uid = 0; + switch (parse_uid_range(pamh, tok, &min_uid, &max_uid)) + { + case UID_RANGE_NONE: + if (fnmatch (tok, user, 0) == 0) + command = this_command; + break; + case UID_RANGE_MM: + if (pwd->pw_uid >= min_uid && pwd->pw_uid <= max_uid) + command = this_command; + break; + case UID_RANGE_MIN: + if (pwd->pw_uid >= min_uid) + command = this_command; + break; + case UID_RANGE_ONE: + if (pwd->pw_uid == max_uid) + command = this_command; + break; + case UID_RANGE_ERR: + break; + } + } + free (copy); + } + else if (strcmp (argv[i], "open_only") == 0) + open_only = 1; + else if (strcmp (argv[i], "log_passwd") == 0) +#ifdef HAVE_STRUCT_AUDIT_TTY_STATUS_LOG_PASSWD + log_passwd = 1; +#else /* HAVE_STRUCT_AUDIT_TTY_STATUS_LOG_PASSWD */ + pam_syslog (pamh, LOG_WARNING, + "The log_passwd option was not available at compile time."); +#warning "pam_tty_audit: The log_passwd option is not available. Please upgrade your headers/kernel." +#endif /* HAVE_STRUCT_AUDIT_TTY_STATUS_LOG_PASSWD */ + else + { + pam_syslog (pamh, LOG_ERR, "unknown option `%s'", argv[i]); + } + } + if (command == CMD_NONE) + return PAM_SUCCESS; + + old_status = malloc (sizeof (*old_status)); + if (old_status == NULL) + return PAM_SESSION_ERR; + + fd = nl_open (); + if (fd == -1 + && errno == EPROTONOSUPPORT) + { + pam_syslog (pamh, LOG_WARNING, "unable to open audit socket, audit not " + "supported; tty_audit skipped"); + free (old_status); + return PAM_IGNORE; + } + else if (fd == -1 + || nl_send (fd, AUDIT_TTY_GET, 0, NULL, 0) != 0 + || nl_recv (fd, AUDIT_TTY_GET, old_status, sizeof (*old_status)) != 0) + { + pam_syslog (pamh, LOG_ERR, "error reading current audit status: %m"); + if (fd != -1) + close (fd); + free (old_status); + return PAM_SESSION_ERR; + } + + memcpy(&new_status, old_status, sizeof(new_status)); + + new_status.enabled = (command == CMD_ENABLE ? 1 : 0); +#ifdef HAVE_STRUCT_AUDIT_TTY_STATUS_LOG_PASSWD + new_status.log_passwd = log_passwd; +#endif /* HAVE_STRUCT_AUDIT_TTY_STATUS_LOG_PASSWD */ + if (old_status->enabled == new_status.enabled +#ifdef HAVE_STRUCT_AUDIT_TTY_STATUS_LOG_PASSWD + && old_status->log_passwd == new_status.log_passwd +#endif /* HAVE_STRUCT_AUDIT_TTY_STATUS_LOG_PASSWD */ + ) + { + open_only = 1; /* to clean up old_status */ + goto ok_fd; + } + + if (open_only == 0 + && pam_set_data (pamh, DATANAME, old_status, cleanup_old_status) + != PAM_SUCCESS) + { + pam_syslog (pamh, LOG_ERR, "error saving old audit status"); + close (fd); + free (old_status); + return PAM_SESSION_ERR; + } + + if (nl_send (fd, AUDIT_TTY_SET, NLM_F_ACK, &new_status, + sizeof (new_status)) != 0 + || nl_recv_ack (fd) != 0) + { + pam_syslog (pamh, LOG_ERR, "error setting current audit status: %m"); + close (fd); + if (open_only != 0) + free (old_status); + return PAM_SESSION_ERR; + } + /* Fall through */ + ok_fd: + close (fd); + pam_syslog (pamh, LOG_DEBUG, "changed status from %d to %d", + old_status->enabled, new_status.enabled); + if (open_only != 0) + free (old_status); + return PAM_SUCCESS; +} + +int +pam_sm_close_session (pam_handle_t *pamh, int flags, int argc, + const char **argv) +{ + const void *status_; + + (void)flags; + (void)argc; + (void)argv; + if (pam_get_data (pamh, DATANAME, &status_) == PAM_SUCCESS) + { + const struct audit_tty_status *status; + int fd; + + status = status_; + + fd = nl_open (); + if (fd == -1 + || nl_send (fd, AUDIT_TTY_SET, NLM_F_ACK, status, + sizeof (*status)) != 0 + || nl_recv_ack (fd) != 0) + { + pam_syslog (pamh, LOG_ERR, "error restoring audit status: %m"); + if (fd != -1) + close (fd); + return PAM_SESSION_ERR; + } + close (fd); + pam_syslog (pamh, LOG_DEBUG, "restored status to %d", status->enabled); + } + return PAM_SUCCESS; +} diff --git a/modules/pam_tty_audit/tst-pam_tty_audit b/modules/pam_tty_audit/tst-pam_tty_audit new file mode 100755 index 0000000..2b8ab4b --- /dev/null +++ b/modules/pam_tty_audit/tst-pam_tty_audit @@ -0,0 +1,2 @@ +#!/bin/sh +../../tests/tst-dlopen .libs/pam_tty_audit.so |