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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 12:01:37 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-27 12:01:37 +0000
commitde848d9e9146434817c65d74d1d0313e9d729462 (patch)
treedcbd0efb229b17f696f7195671f05b354b4f70fc /modules/pam_faillock
parentInitial commit. (diff)
downloadpam-de848d9e9146434817c65d74d1d0313e9d729462.tar.xz
pam-de848d9e9146434817c65d74d1d0313e9d729462.zip
Adding upstream version 1.4.0.upstream/1.4.0upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'modules/pam_faillock')
-rw-r--r--modules/pam_faillock/Makefile.am50
-rw-r--r--modules/pam_faillock/Makefile.in1340
-rw-r--r--modules/pam_faillock/README140
-rw-r--r--modules/pam_faillock/README.xml46
-rw-r--r--modules/pam_faillock/faillock.878
-rw-r--r--modules/pam_faillock/faillock.8.xml123
-rw-r--r--modules/pam_faillock/faillock.c161
-rw-r--r--modules/pam_faillock/faillock.conf62
-rw-r--r--modules/pam_faillock/faillock.conf.5166
-rw-r--r--modules/pam_faillock/faillock.conf.5.xml243
-rw-r--r--modules/pam_faillock/faillock.h75
-rw-r--r--modules/pam_faillock/main.c232
-rw-r--r--modules/pam_faillock/pam_faillock.8262
-rw-r--r--modules/pam_faillock/pam_faillock.8.xml362
-rw-r--r--modules/pam_faillock/pam_faillock.c775
-rwxr-xr-xmodules/pam_faillock/tst-pam_faillock2
16 files changed, 4117 insertions, 0 deletions
diff --git a/modules/pam_faillock/Makefile.am b/modules/pam_faillock/Makefile.am
new file mode 100644
index 0000000..b1f2b3e
--- /dev/null
+++ b/modules/pam_faillock/Makefile.am
@@ -0,0 +1,50 @@
+#
+# Copyright (c) 2005, 2006, 2007, 2009 Thorsten Kukuk <kukuk@thkukuk.de>
+# Copyright (c) 2008, 2018, 2020 Red Hat, Inc.
+# Copyright (c) 2010 Tomas Mraz <tmraz@redhat.com>
+#
+
+CLEANFILES = *~
+MAINTAINERCLEANFILES = $(MANS) README
+
+EXTRA_DIST = $(XMLS)
+
+if HAVE_DOC
+dist_man_MANS = pam_faillock.8 faillock.8 faillock.conf.5
+endif
+XMLS = README.xml pam_faillock.8.xml faillock.8.xml faillock.conf.5.xml
+
+dist_check_SCRIPTS = tst-pam_faillock
+TESTS = $(dist_check_SCRIPTS)
+
+securelibdir = $(SECUREDIR)
+secureconfdir = $(SCONFIGDIR)
+
+noinst_HEADERS = faillock.h
+
+AM_CFLAGS = -I$(top_srcdir)/libpam/include -I$(top_srcdir)/libpamc/include \
+ $(WARN_CFLAGS)
+
+faillock_CFLAGS = $(AM_CFLAGS) @PIE_CFLAGS@
+
+pam_faillock_la_LDFLAGS = -no-undefined -avoid-version -module
+pam_faillock_la_LIBADD = $(top_builddir)/libpam/libpam.la $(LIBAUDIT)
+if HAVE_VERSIONING
+ pam_faillock_la_LDFLAGS += -Wl,--version-script=$(srcdir)/../modules.map
+endif
+
+faillock_LDFLAGS = @PIE_LDFLAGS@
+faillock_LDADD = $(top_builddir)/libpam/libpam.la $(LIBAUDIT)
+
+dist_secureconf_DATA = faillock.conf
+
+securelib_LTLIBRARIES = pam_faillock.la
+sbin_PROGRAMS = faillock
+
+pam_faillock_la_SOURCES = pam_faillock.c faillock.c
+faillock_SOURCES = main.c faillock.c
+
+if ENABLE_REGENERATE_MAN
+dist_noinst_DATA = README
+-include $(top_srcdir)/Make.xml.rules
+endif
diff --git a/modules/pam_faillock/Makefile.in b/modules/pam_faillock/Makefile.in
new file mode 100644
index 0000000..b2a8026
--- /dev/null
+++ b/modules/pam_faillock/Makefile.in
@@ -0,0 +1,1340 @@
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+# Copyright (c) 2010 Tomas Mraz <tmraz@redhat.com>
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+ install-data-am install-dist_secureconfDATA install-dvi \
+ install-dvi-am install-exec install-exec-am install-html \
+ install-html-am install-info install-info-am install-man \
+ install-man5 install-man8 install-pdf install-pdf-am \
+ install-ps install-ps-am install-sbinPROGRAMS \
+ install-securelibLTLIBRARIES install-strip installcheck \
+ installcheck-am installdirs maintainer-clean \
+ maintainer-clean-generic mostlyclean mostlyclean-compile \
+ mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+ recheck tags tags-am uninstall uninstall-am \
+ uninstall-dist_secureconfDATA uninstall-man uninstall-man5 \
+ uninstall-man8 uninstall-sbinPROGRAMS \
+ uninstall-securelibLTLIBRARIES
+
+.PRECIOUS: Makefile
+
+@ENABLE_REGENERATE_MAN_TRUE@-include $(top_srcdir)/Make.xml.rules
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/modules/pam_faillock/README b/modules/pam_faillock/README
new file mode 100644
index 0000000..c88705a
--- /dev/null
+++ b/modules/pam_faillock/README
@@ -0,0 +1,140 @@
+pam_faillock — Module counting authentication failures during a specified
+interval
+
+━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+
+DESCRIPTION
+
+This module maintains a list of failed authentication attempts per user during
+a specified interval and locks the account in case there were more than deny
+consecutive failed authentications.
+
+Normally, failed attempts to authenticate root will not cause the root account
+to become blocked, to prevent denial-of-service: if your users aren't given
+shell accounts and root may only login via su or at the machine console (not
+telnet/rsh, etc), this is safe.
+
+OPTIONS
+
+{preauth|authfail|authsucc}
+
+ This argument must be set accordingly to the position of this module
+ instance in the PAM stack.
+
+ The preauth argument must be used when the module is called before the
+ modules which ask for the user credentials such as the password. The module
+ just examines whether the user should be blocked from accessing the service
+ in case there were anomalous number of failed consecutive authentication
+ attempts recently. This call is optional if authsucc is used.
+
+ The authfail argument must be used when the module is called after the
+ modules which determine the authentication outcome, failed. Unless the user
+ is already blocked due to previous authentication failures, the module will
+ record the failure into the appropriate user tally file.
+
+ The authsucc argument must be used when the module is called after the
+ modules which determine the authentication outcome, succeeded. Unless the
+ user is already blocked due to previous authentication failures, the module
+ will then clear the record of the failures in the respective user tally
+ file. Otherwise it will return authentication error. If this call is not
+ done, the pam_faillock will not distinguish between consecutive and
+ non-consecutive failed authentication attempts. The preauth call must be
+ used in such case. Due to complications in the way the PAM stack can be
+ configured it is also possible to call pam_faillock as an account module.
+ In such configuration the module must be also called in the preauth stage.
+
+conf=/path/to/config-file
+
+ Use another configuration file instead of the default /etc/security/
+ faillock.conf.
+
+The options for configuring the module behavior are described in the
+faillock.conf(5) manual page. The options specified on the module command line
+override the values from the configuration file.
+
+NOTES
+
+Configuring options on the module command line is not recommend. The /etc/
+security/faillock.conf should be used instead.
+
+The setup of pam_faillock in the PAM stack is different from the pam_tally2
+module setup.
+
+Individual files with the failure records are created as owned by the user.
+This allows pam_faillock.so module to work correctly when it is called from a
+screensaver.
+
+Note that using the module in preauth without the silent option specified in /
+etc/security/faillock.conf or with requisite control field leaks an information
+about existence or non-existence of an user account in the system because the
+failures are not recorded for the unknown users. The message about the user
+account being locked is never displayed for non-existing user accounts allowing
+the adversary to infer that a particular account is not existing on a system.
+
+EXAMPLES
+
+Here are two possible configuration examples for /etc/pam.d/login. They make
+pam_faillock to lock the account after 4 consecutive failed logins during the
+default interval of 15 minutes. Root account will be locked as well. The
+accounts will be automatically unlocked after 20 minutes.
+
+In the first example the module is called only in the auth phase and the module
+does not print any information about the account being blocked by pam_faillock.
+The preauth call can be added to tell users that their logins are blocked by
+the module and also to abort the authentication without even asking for
+password in such case.
+
+/etc/security/faillock.conf file example:
+
+deny=4
+unlock_time=1200
+silent
+
+
+/etc/pam.d/config file example:
+
+auth required pam_securetty.so
+auth required pam_env.so
+auth required pam_nologin.so
+# optionally call: auth requisite pam_faillock.so preauth
+# to display the message about account being locked
+auth [success=1 default=bad] pam_unix.so
+auth [default=die] pam_faillock.so authfail
+auth sufficient pam_faillock.so authsucc
+auth required pam_deny.so
+account required pam_unix.so
+password required pam_unix.so shadow
+session required pam_selinux.so close
+session required pam_loginuid.so
+session required pam_unix.so
+session required pam_selinux.so open
+
+
+In the second example the module is called both in the auth and account phases
+and the module informs the authenticating user when the account is locked if
+silent option is not specified in the faillock.conf.
+
+auth required pam_securetty.so
+auth required pam_env.so
+auth required pam_nologin.so
+auth required pam_faillock.so preauth
+# optionally use requisite above if you do not want to prompt for the password
+# on locked accounts
+auth sufficient pam_unix.so
+auth [default=die] pam_faillock.so authfail
+auth required pam_deny.so
+account required pam_faillock.so
+# if you drop the above call to pam_faillock.so the lock will be done also
+# on non-consecutive authentication failures
+account required pam_unix.so
+password required pam_unix.so shadow
+session required pam_selinux.so close
+session required pam_loginuid.so
+session required pam_unix.so
+session required pam_selinux.so open
+
+
+AUTHOR
+
+pam_faillock was written by Tomas Mraz.
+
diff --git a/modules/pam_faillock/README.xml b/modules/pam_faillock/README.xml
new file mode 100644
index 0000000..f0654db
--- /dev/null
+++ b/modules/pam_faillock/README.xml
@@ -0,0 +1,46 @@
+<?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_faillock.8.xml">
+-->
+]>
+
+<article>
+
+ <articleinfo>
+
+ <title>
+ <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+ href="pam_faillock.8.xml" xpointer='xpointer(//refnamediv[@id = "pam_faillock-name"]/*)'/>
+ </title>
+
+ </articleinfo>
+
+ <section>
+ <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+ href="pam_faillock.8.xml" xpointer='xpointer(//refsect1[@id = "pam_faillock-description"]/*)'/>
+ </section>
+
+ <section>
+ <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+ href="pam_faillock.8.xml" xpointer='xpointer(//refsect1[@id = "pam_faillock-options"]/*)'/>
+ </section>
+
+ <section>
+ <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+ href="pam_faillock.8.xml" xpointer='xpointer(//refsect1[@id = "pam_faillock-notes"]/*)'/>
+ </section>
+
+ <section>
+ <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+ href="pam_faillock.8.xml" xpointer='xpointer(//refsect1[@id = "pam_faillock-examples"]/*)'/>
+ </section>
+
+ <section>
+ <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
+ href="pam_faillock.8.xml" xpointer='xpointer(//refsect1[@id = "pam_faillock-author"]/*)'/>
+ </section>
+
+</article>
diff --git a/modules/pam_faillock/faillock.8 b/modules/pam_faillock/faillock.8
new file mode 100644
index 0000000..3ba58aa
--- /dev/null
+++ b/modules/pam_faillock/faillock.8
@@ -0,0 +1,78 @@
+'\" t
+.\" Title: faillock
+.\" 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 "FAILLOCK" "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"
+faillock \- Tool for displaying and modifying the authentication failure record files
+.SH "SYNOPSIS"
+.HP \w'\fBfaillock\fR\ 'u
+\fBfaillock\fR [\-\-dir\ \fI/path/to/tally\-directory\fR] [\-\-user\ \fIusername\fR] [\-\-reset]
+.SH "DESCRIPTION"
+.PP
+The
+\fIpam_faillock\&.so\fR
+module maintains a list of failed authentication attempts per user during a specified interval and locks the account in case there were more than
+\fIdeny\fR
+consecutive failed authentications\&. It stores the failure records into per\-user files in the tally directory\&.
+.PP
+The
+\fBfaillock\fR
+command is an application which can be used to examine and modify the contents of the tally files\&. It can display the recent failed authentication attempts of the
+\fIusername\fR
+or clear the tally files of all or individual
+\fIusernames\fR\&.
+.SH "OPTIONS"
+.PP
+\fB\-\-dir \fR\fB\fI/path/to/tally\-directory\fR\fR
+.RS 4
+The directory where the user files with the failure records are kept\&. The default is
+/var/run/faillock\&.
+.RE
+.PP
+\fB\-\-user \fR\fB\fIusername\fR\fR
+.RS 4
+The user whose failure records should be displayed or cleared\&.
+.RE
+.PP
+\fB\-\-reset\fR
+.RS 4
+Instead of displaying the user\*(Aqs failure records, clear them\&.
+.RE
+.SH "FILES"
+.PP
+/var/run/faillock/*
+.RS 4
+the files logging the authentication failures for users
+.RE
+.SH "SEE ALSO"
+.PP
+\fBpam_faillock\fR(8),
+\fBpam\fR(8)
+.SH "AUTHOR"
+.PP
+faillock was written by Tomas Mraz\&.
diff --git a/modules/pam_faillock/faillock.8.xml b/modules/pam_faillock/faillock.8.xml
new file mode 100644
index 0000000..6c20593
--- /dev/null
+++ b/modules/pam_faillock/faillock.8.xml
@@ -0,0 +1,123 @@
+<?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="faillock">
+
+ <refmeta>
+ <refentrytitle>faillock</refentrytitle>
+ <manvolnum>8</manvolnum>
+ <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo>
+ </refmeta>
+
+ <refnamediv id="pam_faillock-name">
+ <refname>faillock</refname>
+ <refpurpose>Tool for displaying and modifying the authentication failure record files</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <cmdsynopsis id="faillock-cmdsynopsis">
+ <command>faillock</command>
+ <arg choice="opt">
+ --dir <replaceable>/path/to/tally-directory</replaceable>
+ </arg>
+ <arg choice="opt">
+ --user <replaceable>username</replaceable>
+ </arg>
+ <arg choice="opt">
+ --reset
+ </arg>
+ </cmdsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1 id="faillock-description">
+
+ <title>DESCRIPTION</title>
+
+ <para>
+ The <emphasis>pam_faillock.so</emphasis> module maintains a list of
+ failed authentication attempts per user during a specified interval
+ and locks the account in case there were more than
+ <replaceable>deny</replaceable> consecutive failed authentications.
+ It stores the failure records into per-user files in the tally
+ directory.
+ </para>
+ <para>
+ The <command>faillock</command> command is an application which
+ can be used to examine and modify the contents of the
+ tally files. It can display the recent failed authentication
+ attempts of the <replaceable>username</replaceable> or clear the tally
+ files of all or individual <replaceable>usernames</replaceable>.
+ </para>
+ </refsect1>
+
+ <refsect1 id="faillock-options">
+
+ <title>OPTIONS</title>
+ <variablelist>
+ <varlistentry>
+ <term>
+ <option>--dir <replaceable>/path/to/tally-directory</replaceable></option>
+ </term>
+ <listitem>
+ <para>
+ The directory where the user files with the failure records are kept. The
+ default is <filename>/var/run/faillock</filename>.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>--user <replaceable>username</replaceable></option>
+ </term>
+ <listitem>
+ <para>
+ The user whose failure records should be displayed or cleared.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>--reset</option>
+ </term>
+ <listitem>
+ <para>
+ Instead of displaying the user's failure records, clear them.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id="faillock-files">
+ <title>FILES</title>
+ <variablelist>
+ <varlistentry>
+ <term><filename>/var/run/faillock/*</filename></term>
+ <listitem>
+ <para>the files logging the authentication failures for users</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id='faillock-see_also'>
+ <title>SEE ALSO</title>
+ <para>
+ <citerefentry>
+ <refentrytitle>pam_faillock</refentrytitle><manvolnum>8</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum>
+ </citerefentry>
+ </para>
+ </refsect1>
+
+ <refsect1 id='faillock-author'>
+ <title>AUTHOR</title>
+ <para>
+ faillock was written by Tomas Mraz.
+ </para>
+ </refsect1>
+
+</refentry>
diff --git a/modules/pam_faillock/faillock.c b/modules/pam_faillock/faillock.c
new file mode 100644
index 0000000..e492f5f
--- /dev/null
+++ b/modules/pam_faillock/faillock.c
@@ -0,0 +1,161 @@
+/*
+ * Copyright (c) 2010 Tomas Mraz <tmraz@redhat.com>
+ * Copyright (c) 2010, 2016, 2017 Red Hat, Inc.
+ *
+ * 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.
+ */
+
+#include "config.h"
+#include <string.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/file.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <security/pam_modutil.h>
+
+#include "faillock.h"
+
+#define ignore_return(x) if (1==((int)x)) {;}
+
+int
+open_tally (const char *dir, const char *user, uid_t uid, int create)
+{
+ char *path;
+ int flags = O_RDWR;
+ int fd;
+
+ if (dir == NULL || strstr(user, "../") != NULL)
+ /* just a defensive programming as the user must be a
+ * valid user on the system anyway
+ */
+ return -1;
+ path = malloc(strlen(dir) + strlen(user) + 2);
+ if (path == NULL)
+ return -1;
+
+ strcpy(path, dir);
+ if (*dir && dir[strlen(dir) - 1] != '/') {
+ strcat(path, "/");
+ }
+ strcat(path, user);
+
+ if (create) {
+ flags |= O_CREAT;
+ }
+
+ fd = open(path, flags, 0600);
+
+ free(path);
+
+ if (fd != -1) {
+ struct stat st;
+
+ while (flock(fd, LOCK_EX) == -1 && errno == EINTR);
+ if (fstat(fd, &st) == 0) {
+ if (st.st_uid != uid) {
+ ignore_return(fchown(fd, uid, -1));
+ }
+ }
+ }
+
+ return fd;
+}
+
+#define CHUNK_SIZE (64 * sizeof(struct tally))
+#define MAX_RECORDS 1024
+
+int
+read_tally(int fd, struct tally_data *tallies)
+{
+ void *data = NULL, *newdata;
+ unsigned int count = 0;
+ ssize_t chunk = 0;
+
+ do {
+ newdata = realloc(data, count * sizeof(struct tally) + CHUNK_SIZE);
+ if (newdata == NULL) {
+ free(data);
+ return -1;
+ }
+
+ data = newdata;
+
+ chunk = pam_modutil_read(fd, (char *)data + count * sizeof(struct tally), CHUNK_SIZE);
+ if (chunk < 0) {
+ free(data);
+ return -1;
+ }
+
+ count += chunk/sizeof(struct tally);
+
+ if (count >= MAX_RECORDS)
+ break;
+ }
+ while (chunk == CHUNK_SIZE);
+
+ tallies->records = data;
+ tallies->count = count;
+
+ return 0;
+}
+
+int
+update_tally(int fd, struct tally_data *tallies)
+{
+ void *data = tallies->records;
+ unsigned int count = tallies->count;
+ ssize_t chunk;
+
+ if (tallies->count > MAX_RECORDS) {
+ data = tallies->records + (count - MAX_RECORDS);
+ count = MAX_RECORDS;
+ }
+
+ if (lseek(fd, 0, SEEK_SET) == (off_t)-1) {
+ return -1;
+ }
+
+ chunk = pam_modutil_write(fd, data, count * sizeof(struct tally));
+
+ if (chunk != (ssize_t)(count * sizeof(struct tally))) {
+ return -1;
+ }
+
+ if (ftruncate(fd, count * sizeof(struct tally)) == -1)
+ return -1;
+
+ return 0;
+}
diff --git a/modules/pam_faillock/faillock.conf b/modules/pam_faillock/faillock.conf
new file mode 100644
index 0000000..16d93df
--- /dev/null
+++ b/modules/pam_faillock/faillock.conf
@@ -0,0 +1,62 @@
+# Configuration for locking the user after multiple failed
+# authentication attempts.
+#
+# The directory where the user files with the failure records are kept.
+# The default is /var/run/faillock.
+# dir = /var/run/faillock
+#
+# Will log the user name into the system log if the user is not found.
+# Enabled if option is present.
+# audit
+#
+# Don't print informative messages.
+# Enabled if option is present.
+# silent
+#
+# Don't log informative messages via syslog.
+# Enabled if option is present.
+# no_log_info
+#
+# Only track failed user authentications attempts for local users
+# in /etc/passwd and ignore centralized (AD, IdM, LDAP, etc.) users.
+# The `faillock` command will also no longer track user failed
+# authentication attempts. Enabling this option will prevent a
+# double-lockout scenario where a user is locked out locally and
+# in the centralized mechanism.
+# Enabled if option is present.
+# local_users_only
+#
+# Deny access if the number of consecutive authentication failures
+# for this user during the recent interval exceeds n tries.
+# The default is 3.
+# deny = 3
+#
+# The length of the interval during which the consecutive
+# authentication failures must happen for the user account
+# lock out is <replaceable>n</replaceable> seconds.
+# The default is 900 (15 minutes).
+# fail_interval = 900
+#
+# The access will be re-enabled after n seconds after the lock out.
+# The value 0 has the same meaning as value `never` - the access
+# will not be re-enabled without resetting the faillock
+# entries by the `faillock` command.
+# The default is 600 (10 minutes).
+# unlock_time = 600
+#
+# Root account can become locked as well as regular accounts.
+# Enabled if option is present.
+# even_deny_root
+#
+# This option implies the `even_deny_root` option.
+# Allow access after n seconds to root account after the
+# account is locked. In case the option is not specified
+# the value is the same as of the `unlock_time` option.
+# root_unlock_time = 900
+#
+# If a group name is specified with this option, members
+# of the group will be handled by this module the same as
+# the root account (the options `even_deny_root>` and
+# `root_unlock_time` will apply to them.
+# By default, the option is not set.
+# admin_group = <admin_group_name>
diff --git a/modules/pam_faillock/faillock.conf.5 b/modules/pam_faillock/faillock.conf.5
new file mode 100644
index 0000000..7870153
--- /dev/null
+++ b/modules/pam_faillock/faillock.conf.5
@@ -0,0 +1,166 @@
+'\" t
+.\" Title: faillock.conf
+.\" Author: [see the "AUTHOR" section]
+.\" Generator: DocBook XSL Stylesheets v1.79.1 <http://docbook.sf.net/>
+.\" Date: 06/08/2020
+.\" Manual: Linux-PAM Manual
+.\" Source: Linux-PAM Manual
+.\" Language: English
+.\"
+.TH "FAILLOCK\&.CONF" "5" "06/08/2020" "Linux-PAM Manual" "Linux\-PAM Manual"
+.\" -----------------------------------------------------------------
+.\" * Define some portability stuff
+.\" -----------------------------------------------------------------
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.\" http://bugs.debian.org/507673
+.\" http://lists.gnu.org/archive/html/groff/2009-02/msg00013.html
+.\" ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+.ie \n(.g .ds Aq \(aq
+.el .ds Aq '
+.\" -----------------------------------------------------------------
+.\" * set default formatting
+.\" -----------------------------------------------------------------
+.\" disable hyphenation
+.nh
+.\" disable justification (adjust text to left margin only)
+.ad l
+.\" -----------------------------------------------------------------
+.\" * MAIN CONTENT STARTS HERE *
+.\" -----------------------------------------------------------------
+.SH "NAME"
+faillock.conf \- pam_faillock configuration file
+.SH "DESCRIPTION"
+.PP
+\fBfaillock\&.conf\fR
+provides a way to configure the default settings for locking the user after multiple failed authentication attempts\&. This file is read by the
+\fIpam_faillock\fR
+module and is the preferred method over configuring
+\fIpam_faillock\fR
+directly\&.
+.PP
+The file has a very simple
+\fIname = value\fR
+format with possible comments starting with
+\fI#\fR
+character\&. The whitespace at the beginning of line, end of line, and around the
+\fI=\fR
+sign is ignored\&.
+.SH "OPTIONS"
+.PP
+\fBdir=\fR\fB\fI/path/to/tally\-directory\fR\fR
+.RS 4
+The directory where the user files with the failure records are kept\&. The default is
+/var/run/faillock\&.
+.RE
+.PP
+\fBaudit\fR
+.RS 4
+Will log the user name into the system log if the user is not found\&.
+.RE
+.PP
+\fBsilent\fR
+.RS 4
+Don\*(Aqt print informative messages to the user\&. Please note that when this option is not used there will be difference in the authentication behavior for users which exist on the system and non\-existing users\&.
+.RE
+.PP
+\fBno_log_info\fR
+.RS 4
+Don\*(Aqt log informative messages via
+\fBsyslog\fR(3)\&.
+.RE
+.PP
+\fBlocal_users_only\fR
+.RS 4
+Only track failed user authentications attempts for local users in /etc/passwd and ignore centralized (AD, IdM, LDAP, etc\&.) users\&. The
+\fBfaillock\fR(8)
+command will also no longer track user failed authentication attempts\&. Enabling this option will prevent a double\-lockout scenario where a user is locked out locally and in the centralized mechanism\&.
+.RE
+.PP
+\fBdeny=\fR\fB\fIn\fR\fR
+.RS 4
+Deny access if the number of consecutive authentication failures for this user during the recent interval exceeds
+\fIn\fR\&. The default is 3\&.
+.RE
+.PP
+\fBfail_interval=\fR\fB\fIn\fR\fR
+.RS 4
+The length of the interval during which the consecutive authentication failures must happen for the user account lock out is
+\fIn\fR
+seconds\&. The default is 900 (15 minutes)\&.
+.RE
+.PP
+\fBunlock_time=\fR\fB\fIn\fR\fR
+.RS 4
+The access will be re\-enabled after
+\fIn\fR
+seconds after the lock out\&. The value 0 has the same meaning as value
+\fInever\fR
+\- the access will not be re\-enabled without resetting the faillock entries by the
+\fBfaillock\fR(8)
+command\&. The default is 600 (10 minutes)\&.
+.sp
+Note that the default directory that
+\fIpam_faillock\fR
+uses is usually cleared on system boot so the access will be also re\-enabled after system reboot\&. If that is undesirable a different tally directory must be set with the
+\fBdir\fR
+option\&.
+.sp
+Also note that it is usually undesirable to permanently lock out users as they can become easily a target of denial of service attack unless the usernames are random and kept secret to potential attackers\&.
+.RE
+.PP
+\fBeven_deny_root\fR
+.RS 4
+Root account can become locked as well as regular accounts\&.
+.RE
+.PP
+\fBroot_unlock_time=\fR\fB\fIn\fR\fR
+.RS 4
+This option implies
+\fBeven_deny_root\fR
+option\&. Allow access after
+\fIn\fR
+seconds to root account after the account is locked\&. In case the option is not specified the value is the same as of the
+\fBunlock_time\fR
+option\&.
+.RE
+.PP
+\fBadmin_group=\fR\fB\fIname\fR\fR
+.RS 4
+If a group name is specified with this option, members of the group will be handled by this module the same as the root account (the options
+\fBeven_deny_root\fR
+and
+\fBroot_unlock_time\fR
+will apply to them\&. By default the option is not set\&.
+.RE
+.SH "EXAMPLES"
+.PP
+/etc/security/faillock\&.conf file example:
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+deny=4
+unlock_time=1200
+silent
+
+.fi
+.if n \{\
+.RE
+.\}
+.SH "FILES"
+.PP
+/etc/security/faillock\&.conf
+.RS 4
+the config file for custom options
+.RE
+.SH "SEE ALSO"
+.PP
+\fBfaillock\fR(8),
+\fBpam_faillock\fR(8),
+\fBpam.conf\fR(5),
+\fBpam.d\fR(5),
+\fBpam\fR(8)
+.SH "AUTHOR"
+.PP
+pam_faillock was written by Tomas Mraz\&. The support for faillock\&.conf was written by Brian Ward\&.
diff --git a/modules/pam_faillock/faillock.conf.5.xml b/modules/pam_faillock/faillock.conf.5.xml
new file mode 100644
index 0000000..aa8500b
--- /dev/null
+++ b/modules/pam_faillock/faillock.conf.5.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="faillock.conf">
+
+ <refmeta>
+ <refentrytitle>faillock.conf</refentrytitle>
+ <manvolnum>5</manvolnum>
+ <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo>
+ </refmeta>
+
+ <refnamediv id="faillock.conf-name">
+ <refname>faillock.conf</refname>
+ <refpurpose>pam_faillock configuration file</refpurpose>
+ </refnamediv>
+
+ <refsect1 id="faillock.conf-description">
+
+ <title>DESCRIPTION</title>
+ <para>
+ <emphasis remap='B'>faillock.conf</emphasis> provides a way to configure the
+ default settings for locking the user after multiple failed authentication attempts.
+ This file is read by the <emphasis>pam_faillock</emphasis> module and is the
+ preferred method over configuring <emphasis>pam_faillock</emphasis> directly.
+ </para>
+ <para>
+ The file has a very simple <emphasis>name = value</emphasis> format with possible comments
+ starting with <emphasis>#</emphasis> character. The whitespace at the beginning of line, end
+ of line, and around the <emphasis>=</emphasis> sign is ignored.
+ </para>
+ </refsect1>
+
+ <refsect1 id="faillock.conf-options">
+
+ <title>OPTIONS</title>
+ <variablelist>
+ <varlistentry>
+ <term>
+ <option>dir=<replaceable>/path/to/tally-directory</replaceable></option>
+ </term>
+ <listitem>
+ <para>
+ The directory where the user files with the failure records are kept. The
+ default is <filename>/var/run/faillock</filename>.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>audit</option>
+ </term>
+ <listitem>
+ <para>
+ Will log the user name into the system log if the user is not found.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>silent</option>
+ </term>
+ <listitem>
+ <para>
+ Don't print informative messages to the user. Please note that when
+ this option is not used there will be difference in the authentication
+ behavior for users which exist on the system and non-existing users.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>no_log_info</option>
+ </term>
+ <listitem>
+ <para>
+ Don't log informative messages via <citerefentry><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry>.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>local_users_only</option>
+ </term>
+ <listitem>
+ <para>
+ Only track failed user authentications attempts for local users
+ in /etc/passwd and ignore centralized (AD, IdM, LDAP, etc.) users.
+ The <citerefentry><refentrytitle>faillock</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+ command will also no longer track user failed
+ authentication attempts. Enabling this option will prevent a
+ double-lockout scenario where a user is locked out locally and
+ in the centralized mechanism.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>deny=<replaceable>n</replaceable></option>
+ </term>
+ <listitem>
+ <para>
+ Deny access if the number of consecutive authentication failures
+ for this user during the recent interval exceeds
+ <replaceable>n</replaceable>. The default is 3.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>fail_interval=<replaceable>n</replaceable></option>
+ </term>
+ <listitem>
+ <para>
+ The length of the interval during which the consecutive
+ authentication failures must happen for the user account
+ lock out is <replaceable>n</replaceable> seconds.
+ The default is 900 (15 minutes).
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>unlock_time=<replaceable>n</replaceable></option>
+ </term>
+ <listitem>
+ <para>
+ The access will be re-enabled after
+ <replaceable>n</replaceable> seconds after the lock out.
+ The value 0 has the same meaning as value
+ <emphasis>never</emphasis> - the access
+ will not be re-enabled without resetting the faillock
+ entries by the <citerefentry><refentrytitle>faillock</refentrytitle><manvolnum>8</manvolnum></citerefentry> command.
+ The default is 600 (10 minutes).
+ </para>
+ <para>
+ Note that the default directory that <emphasis>pam_faillock</emphasis>
+ uses is usually cleared on system boot so the access will be also re-enabled
+ after system reboot. If that is undesirable a different tally directory
+ must be set with the <option>dir</option> option.
+ </para>
+ <para>
+ Also note that it is usually undesirable to permanently lock
+ out users as they can become easily a target of denial of service
+ attack unless the usernames are random and kept secret to potential
+ attackers.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>even_deny_root</option>
+ </term>
+ <listitem>
+ <para>
+ Root account can become locked as well as regular accounts.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>root_unlock_time=<replaceable>n</replaceable></option>
+ </term>
+ <listitem>
+ <para>
+ This option implies <option>even_deny_root</option> option.
+ Allow access after <replaceable>n</replaceable> seconds
+ to root account after the account is locked. In case the
+ option is not specified the value is the same as of the
+ <option>unlock_time</option> option.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>admin_group=<replaceable>name</replaceable></option>
+ </term>
+ <listitem>
+ <para>
+ If a group name is specified with this option, members
+ of the group will be handled by this module the same as
+ the root account (the options <option>even_deny_root</option>
+ and <option>root_unlock_time</option> will apply to them.
+ By default the option is not set.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id='faillock.conf-examples'>
+ <title>EXAMPLES</title>
+ <para>
+ /etc/security/faillock.conf file example:
+ </para>
+ <programlisting>
+deny=4
+unlock_time=1200
+silent
+ </programlisting>
+ </refsect1>
+
+ <refsect1 id="faillock.conf-files">
+ <title>FILES</title>
+ <variablelist>
+ <varlistentry>
+ <term><filename>/etc/security/faillock.conf</filename></term>
+ <listitem>
+ <para>the config file for custom options</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id='faillock.conf-see_also'>
+ <title>SEE ALSO</title>
+ <para>
+ <citerefentry>
+ <refentrytitle>faillock</refentrytitle><manvolnum>8</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>pam_faillock</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='faillock.conf-author'>
+ <title>AUTHOR</title>
+ <para>
+ pam_faillock was written by Tomas Mraz. The support for faillock.conf was written by Brian Ward.
+ </para>
+ </refsect1>
+
+</refentry>
diff --git a/modules/pam_faillock/faillock.h b/modules/pam_faillock/faillock.h
new file mode 100644
index 0000000..b22a9df
--- /dev/null
+++ b/modules/pam_faillock/faillock.h
@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2010 Tomas Mraz <tmraz@redhat.com>
+ *
+ * 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.
+ */
+
+/*
+ * faillock.h - authentication failure data file record structure
+ *
+ * Each record in the file represents an instance of login failure of
+ * the user at the recorded time.
+ */
+
+
+#ifndef _FAILLOCK_H
+#define _FAILLOCK_H
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#define TALLY_STATUS_VALID 0x1 /* the tally file entry is valid */
+#define TALLY_STATUS_RHOST 0x2 /* the source is rhost */
+#define TALLY_STATUS_TTY 0x4 /* the source is tty */
+/* If neither TALLY_FLAG_RHOST nor TALLY_FLAG_TTY are set the source is service. */
+
+struct tally {
+ char source[52]; /* rhost or tty of the login failure */
+ /* (not necessarily NULL terminated) */
+ uint16_t reserved; /* reserved for future use */
+ uint16_t status; /* record status */
+ uint64_t time; /* time of the login failure */
+};
+/* 64 bytes per entry */
+
+struct tally_data {
+ struct tally *records; /* array of tallies */
+ unsigned int count; /* number of records */
+};
+
+#define FAILLOCK_DEFAULT_TALLYDIR "/var/run/faillock"
+#define FAILLOCK_DEFAULT_CONF "/etc/security/faillock.conf"
+
+int open_tally(const char *dir, const char *user, uid_t uid, int create);
+int read_tally(int fd, struct tally_data *tallies);
+int update_tally(int fd, struct tally_data *tallies);
+#endif
diff --git a/modules/pam_faillock/main.c b/modules/pam_faillock/main.c
new file mode 100644
index 0000000..c578016
--- /dev/null
+++ b/modules/pam_faillock/main.c
@@ -0,0 +1,232 @@
+/*
+ * Copyright (c) 2010 Tomas Mraz <tmraz@redhat.com>
+ * Copyright (c) 2010 Red Hat, Inc.
+ *
+ * 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.
+ */
+
+#include "config.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <dirent.h>
+#include <errno.h>
+#include <pwd.h>
+#include <time.h>
+#include <sys/types.h>
+#include <unistd.h>
+#ifdef HAVE_LIBAUDIT
+#include <libaudit.h>
+
+#define AUDIT_NO_ID ((unsigned int) -1)
+#endif
+
+#include "faillock.h"
+
+struct options {
+ unsigned int reset;
+ const char *dir;
+ const char *user;
+ const char *progname;
+};
+
+static int
+args_parse(int argc, char **argv, struct options *opts)
+{
+ int i;
+ memset(opts, 0, sizeof(*opts));
+
+ opts->dir = FAILLOCK_DEFAULT_TALLYDIR;
+ opts->progname = argv[0];
+
+ for (i = 1; i < argc; ++i) {
+
+ if (strcmp(argv[i], "--dir") == 0) {
+ ++i;
+ if (i >= argc || strlen(argv[i]) == 0) {
+ fprintf(stderr, "%s: No directory supplied.\n", argv[0]);
+ return -1;
+ }
+ opts->dir = argv[i];
+ }
+ else if (strcmp(argv[i], "--user") == 0) {
+ ++i;
+ if (i >= argc || strlen(argv[i]) == 0) {
+ fprintf(stderr, "%s: No user name supplied.\n", argv[0]);
+ return -1;
+ }
+ opts->user = argv[i];
+ }
+ else if (strcmp(argv[i], "--reset") == 0) {
+ opts->reset = 1;
+ }
+ else {
+ fprintf(stderr, "%s: Unknown option: %s\n", argv[0], argv[i]);
+ return -1;
+ }
+ }
+ return 0;
+}
+
+static void
+usage(const char *progname)
+{
+ fprintf(stderr, _("Usage: %s [--dir /path/to/tally-directory] [--user username] [--reset]\n"),
+ progname);
+}
+
+static int
+do_user(struct options *opts, const char *user)
+{
+ int fd;
+ int rv;
+ struct tally_data tallies;
+ struct passwd *pwd;
+
+ pwd = getpwnam(user);
+
+ fd = open_tally(opts->dir, user, pwd != NULL ? pwd->pw_uid : 0, 0);
+
+ if (fd == -1) {
+ if (errno == ENOENT) {
+ return 0;
+ }
+ else {
+ fprintf(stderr, "%s: Error opening the tally file for %s:",
+ opts->progname, user);
+ perror(NULL);
+ return 3;
+ }
+ }
+ if (opts->reset) {
+#ifdef HAVE_LIBAUDIT
+ int audit_fd;
+#endif
+
+ while ((rv=ftruncate(fd, 0)) == -1 && errno == EINTR);
+ if (rv == -1) {
+ fprintf(stderr, "%s: Error clearing the tally file for %s:",
+ opts->progname, user);
+ perror(NULL);
+#ifdef HAVE_LIBAUDIT
+ }
+ if ((audit_fd=audit_open()) >= 0) {
+ audit_log_acct_message(audit_fd, AUDIT_USER_MGMT, NULL,
+ "faillock-reset", user,
+ pwd != NULL ? pwd->pw_uid : AUDIT_NO_ID,
+ NULL, NULL, NULL, rv == 0);
+ close(audit_fd);
+ }
+ if (rv == -1) {
+#endif
+ close(fd);
+ return 4;
+ }
+ }
+ else {
+ unsigned int i;
+
+ memset(&tallies, 0, sizeof(tallies));
+ if ((rv=read_tally(fd, &tallies)) == -1) {
+ fprintf(stderr, "%s: Error reading the tally file for %s:",
+ opts->progname, user);
+ perror(NULL);
+ close(fd);
+ return 5;
+ }
+
+ printf("%s:\n", user);
+ printf("%-19s %-5s %-48s %-5s\n", "When", "Type", "Source", "Valid");
+
+ for (i = 0; i < tallies.count; i++) {
+ struct tm *tm;
+ char timebuf[80];
+ uint16_t status = tallies.records[i].status;
+ time_t when = tallies.records[i].time;
+
+ tm = localtime(&when);
+ strftime(timebuf, sizeof(timebuf), "%Y-%m-%d %H:%M:%S", tm);
+ printf("%-19s %-5s %-52.52s %s\n", timebuf,
+ status & TALLY_STATUS_RHOST ? "RHOST" : (status & TALLY_STATUS_TTY ? "TTY" : "SVC"),
+ tallies.records[i].source, status & TALLY_STATUS_VALID ? "V":"I");
+ }
+ free(tallies.records);
+ }
+ close(fd);
+ return 0;
+}
+
+static int
+do_allusers(struct options *opts)
+{
+ struct dirent **userlist;
+ int rv, i;
+
+ rv = scandir(opts->dir, &userlist, NULL, alphasort);
+ if (rv < 0) {
+ fprintf(stderr, "%s: Error reading tally directory: %m\n", opts->progname);
+ return 2;
+ }
+
+ for (i = 0; i < rv; i++) {
+ if (userlist[i]->d_name[0] == '.') {
+ if ((userlist[i]->d_name[1] == '.' && userlist[i]->d_name[2] == '\0') ||
+ userlist[i]->d_name[1] == '\0')
+ continue;
+ }
+ do_user(opts, userlist[i]->d_name);
+ free(userlist[i]);
+ }
+ free(userlist);
+
+ return 0;
+}
+
+
+/*-----------------------------------------------------------------------*/
+int
+main (int argc, char *argv[])
+{
+ struct options opts;
+
+ if (args_parse(argc, argv, &opts)) {
+ usage(argv[0]);
+ return 1;
+ }
+
+ if (opts.user == NULL) {
+ return do_allusers(&opts);
+ }
+
+ return do_user(&opts, opts.user);
+}
diff --git a/modules/pam_faillock/pam_faillock.8 b/modules/pam_faillock/pam_faillock.8
new file mode 100644
index 0000000..593b1fe
--- /dev/null
+++ b/modules/pam_faillock/pam_faillock.8
@@ -0,0 +1,262 @@
+'\" t
+.\" Title: pam_faillock
+.\" 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_FAILLOCK" "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_faillock \- Module counting authentication failures during a specified interval
+.SH "SYNOPSIS"
+.HP \w'\fBauth\ \&.\&.\&.\ pam_faillock\&.so\fR\ 'u
+\fBauth \&.\&.\&. pam_faillock\&.so\fR {preauth|authfail|authsucc} [conf=\fI/path/to/config\-file\fR] [dir=\fI/path/to/tally\-directory\fR] [even_deny_root] [deny=\fIn\fR] [fail_interval=\fIn\fR] [unlock_time=\fIn\fR] [root_unlock_time=\fIn\fR] [admin_group=\fIname\fR] [audit] [silent] [no_log_info]
+.HP \w'\fBaccount\ \&.\&.\&.\ pam_faillock\&.so\fR\ 'u
+\fBaccount \&.\&.\&. pam_faillock\&.so\fR [dir=\fI/path/to/tally\-directory\fR] [no_log_info]
+.SH "DESCRIPTION"
+.PP
+This module maintains a list of failed authentication attempts per user during a specified interval and locks the account in case there were more than
+\fIdeny\fR
+consecutive failed authentications\&.
+.PP
+Normally, failed attempts to authenticate
+\fIroot\fR
+will
+\fBnot\fR
+cause the root account to become blocked, to prevent denial\-of\-service: if your users aren\*(Aqt given shell accounts and root may only login via
+\fBsu\fR
+or at the machine console (not telnet/rsh, etc), this is safe\&.
+.SH "OPTIONS"
+.PP
+\fB{preauth|authfail|authsucc}\fR
+.RS 4
+This argument must be set accordingly to the position of this module instance in the PAM stack\&.
+.sp
+The
+\fIpreauth\fR
+argument must be used when the module is called before the modules which ask for the user credentials such as the password\&. The module just examines whether the user should be blocked from accessing the service in case there were anomalous number of failed consecutive authentication attempts recently\&. This call is optional if
+\fIauthsucc\fR
+is used\&.
+.sp
+The
+\fIauthfail\fR
+argument must be used when the module is called after the modules which determine the authentication outcome, failed\&. Unless the user is already blocked due to previous authentication failures, the module will record the failure into the appropriate user tally file\&.
+.sp
+The
+\fIauthsucc\fR
+argument must be used when the module is called after the modules which determine the authentication outcome, succeeded\&. Unless the user is already blocked due to previous authentication failures, the module will then clear the record of the failures in the respective user tally file\&. Otherwise it will return authentication error\&. If this call is not done, the pam_faillock will not distinguish between consecutive and non\-consecutive failed authentication attempts\&. The
+\fIpreauth\fR
+call must be used in such case\&. Due to complications in the way the PAM stack can be configured it is also possible to call
+\fIpam_faillock\fR
+as an account module\&. In such configuration the module must be also called in the
+\fIpreauth\fR
+stage\&.
+.RE
+.PP
+\fBconf=/path/to/config\-file\fR
+.RS 4
+Use another configuration file instead of the default
+/etc/security/faillock\&.conf\&.
+.RE
+.PP
+The options for configuring the module behavior are described in the
+\fBfaillock.conf\fR(5)
+manual page\&. The options specified on the module command line override the values from the configuration file\&.
+.SH "MODULE TYPES PROVIDED"
+.PP
+The
+\fBauth\fR
+and
+\fBaccount\fR
+module types are provided\&.
+.SH "RETURN VALUES"
+.PP
+PAM_AUTH_ERR
+.RS 4
+An invalid option was given, the module was not able to retrieve the user name, no valid counter file was found, or too many failed logins\&.
+.RE
+.PP
+PAM_BUF_ERR
+.RS 4
+Memory buffer error\&.
+.RE
+.PP
+PAM_CONV_ERR
+.RS 4
+The conversation method supplied by the application failed to obtain the username\&.
+.RE
+.PP
+PAM_INCOMPLETE
+.RS 4
+The conversation method supplied by the application returned PAM_CONV_AGAIN\&.
+.RE
+.PP
+PAM_SUCCESS
+.RS 4
+Everything was successful\&.
+.RE
+.PP
+PAM_IGNORE
+.RS 4
+User not present in passwd database\&.
+.RE
+.SH "NOTES"
+.PP
+Configuring options on the module command line is not recommend\&. The
+/etc/security/faillock\&.conf
+should be used instead\&.
+.PP
+The setup of
+\fIpam_faillock\fR
+in the PAM stack is different from the
+\fIpam_tally2\fR
+module setup\&.
+.PP
+Individual files with the failure records are created as owned by the user\&. This allows
+\fBpam_faillock\&.so\fR
+module to work correctly when it is called from a screensaver\&.
+.PP
+Note that using the module in
+\fBpreauth\fR
+without the
+\fBsilent\fR
+option specified in
+/etc/security/faillock\&.conf
+or with
+\fIrequisite\fR
+control field leaks an information about existence or non\-existence of an user account in the system because the failures are not recorded for the unknown users\&. The message about the user account being locked is never displayed for non\-existing user accounts allowing the adversary to infer that a particular account is not existing on a system\&.
+.SH "EXAMPLES"
+.PP
+Here are two possible configuration examples for
+/etc/pam\&.d/login\&. They make
+\fIpam_faillock\fR
+to lock the account after 4 consecutive failed logins during the default interval of 15 minutes\&. Root account will be locked as well\&. The accounts will be automatically unlocked after 20 minutes\&.
+.PP
+In the first example the module is called only in the
+\fIauth\fR
+phase and the module does not print any information about the account being blocked by
+\fIpam_faillock\fR\&. The
+\fIpreauth\fR
+call can be added to tell users that their logins are blocked by the module and also to abort the authentication without even asking for password in such case\&.
+.PP
+/etc/security/faillock\&.conf
+file example:
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+deny=4
+unlock_time=1200
+silent
+
+.fi
+.if n \{\
+.RE
+.\}
+.PP
+/etc/pam\&.d/config file example:
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+auth required pam_securetty\&.so
+auth required pam_env\&.so
+auth required pam_nologin\&.so
+# optionally call: auth requisite pam_faillock\&.so preauth
+# to display the message about account being locked
+auth [success=1 default=bad] pam_unix\&.so
+auth [default=die] pam_faillock\&.so authfail
+auth sufficient pam_faillock\&.so authsucc
+auth required pam_deny\&.so
+account required pam_unix\&.so
+password required pam_unix\&.so shadow
+session required pam_selinux\&.so close
+session required pam_loginuid\&.so
+session required pam_unix\&.so
+session required pam_selinux\&.so open
+
+.fi
+.if n \{\
+.RE
+.\}
+.PP
+In the second example the module is called both in the
+\fIauth\fR
+and
+\fIaccount\fR
+phases and the module informs the authenticating user when the account is locked if
+\fBsilent\fR
+option is not specified in the
+faillock\&.conf\&.
+.sp
+.if n \{\
+.RS 4
+.\}
+.nf
+auth required pam_securetty\&.so
+auth required pam_env\&.so
+auth required pam_nologin\&.so
+auth required pam_faillock\&.so preauth
+# optionally use requisite above if you do not want to prompt for the password
+# on locked accounts
+auth sufficient pam_unix\&.so
+auth [default=die] pam_faillock\&.so authfail
+auth required pam_deny\&.so
+account required pam_faillock\&.so
+# if you drop the above call to pam_faillock\&.so the lock will be done also
+# on non\-consecutive authentication failures
+account required pam_unix\&.so
+password required pam_unix\&.so shadow
+session required pam_selinux\&.so close
+session required pam_loginuid\&.so
+session required pam_unix\&.so
+session required pam_selinux\&.so open
+
+.fi
+.if n \{\
+.RE
+.\}
+.SH "FILES"
+.PP
+/var/run/faillock/*
+.RS 4
+the files logging the authentication failures for users
+.RE
+.PP
+/etc/security/faillock\&.conf
+.RS 4
+the config file for pam_faillock options
+.RE
+.SH "SEE ALSO"
+.PP
+\fBfaillock\fR(8),
+\fBfaillock.conf\fR(5),
+\fBpam.conf\fR(5),
+\fBpam.d\fR(5),
+\fBpam\fR(8)
+.SH "AUTHOR"
+.PP
+pam_faillock was written by Tomas Mraz\&.
diff --git a/modules/pam_faillock/pam_faillock.8.xml b/modules/pam_faillock/pam_faillock.8.xml
new file mode 100644
index 0000000..f43b401
--- /dev/null
+++ b/modules/pam_faillock/pam_faillock.8.xml
@@ -0,0 +1,362 @@
+<?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_faillock">
+
+ <refmeta>
+ <refentrytitle>pam_faillock</refentrytitle>
+ <manvolnum>8</manvolnum>
+ <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo>
+ </refmeta>
+
+ <refnamediv id="pam_faillock-name">
+ <refname>pam_faillock</refname>
+ <refpurpose>Module counting authentication failures during a specified interval</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <cmdsynopsis id="pam_faillock-cmdsynopsisauth">
+ <command>auth ... pam_faillock.so</command>
+ <arg choice="req">
+ preauth|authfail|authsucc
+ </arg>
+ <arg choice="opt">
+ conf=<replaceable>/path/to/config-file</replaceable>
+ </arg>
+ <arg choice="opt">
+ dir=<replaceable>/path/to/tally-directory</replaceable>
+ </arg>
+ <arg choice="opt">
+ even_deny_root
+ </arg>
+ <arg choice="opt">
+ deny=<replaceable>n</replaceable>
+ </arg>
+ <arg choice="opt">
+ fail_interval=<replaceable>n</replaceable>
+ </arg>
+ <arg choice="opt">
+ unlock_time=<replaceable>n</replaceable>
+ </arg>
+ <arg choice="opt">
+ root_unlock_time=<replaceable>n</replaceable>
+ </arg>
+ <arg choice="opt">
+ admin_group=<replaceable>name</replaceable>
+ </arg>
+ <arg choice="opt">
+ audit
+ </arg>
+ <arg choice="opt">
+ silent
+ </arg>
+ <arg choice="opt">
+ no_log_info
+ </arg>
+ </cmdsynopsis>
+ <cmdsynopsis id="pam_faillock-cmdsynopsisacct">
+ <command>account ... pam_faillock.so</command>
+ <arg choice="opt">
+ dir=<replaceable>/path/to/tally-directory</replaceable>
+ </arg>
+ <arg choice="opt">
+ no_log_info
+ </arg>
+ </cmdsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1 id="pam_faillock-description">
+
+ <title>DESCRIPTION</title>
+
+ <para>
+ This module maintains a list of failed authentication attempts per
+ user during a specified interval and locks the account in case
+ there were more than <replaceable>deny</replaceable> consecutive
+ failed authentications.
+ </para>
+ <para>
+ Normally, failed attempts to authenticate <emphasis>root</emphasis> will
+ <emphasis remap='B'>not</emphasis> cause the root account to become
+ blocked, to prevent denial-of-service: if your users aren't given
+ shell accounts and root may only login via <command>su</command> or
+ at the machine console (not telnet/rsh, etc), this is safe.
+ </para>
+ </refsect1>
+
+ <refsect1 id="pam_faillock-options">
+
+ <title>OPTIONS</title>
+ <variablelist>
+ <varlistentry>
+ <term>
+ <option>{preauth|authfail|authsucc}</option>
+ </term>
+ <listitem>
+ <para>
+ This argument must be set accordingly to the position of this module
+ instance in the PAM stack.
+ </para>
+ <para>
+ The <emphasis>preauth</emphasis> argument must be used when the module
+ is called before the modules which ask for the user credentials such
+ as the password. The module just examines whether the user should
+ be blocked from accessing the service in case there were anomalous
+ number of failed consecutive authentication attempts recently. This
+ call is optional if <emphasis>authsucc</emphasis> is used.
+ </para>
+ <para>
+ The <emphasis>authfail</emphasis> argument must be used when the module
+ is called after the modules which determine the authentication outcome,
+ failed. Unless the user is already blocked due to previous authentication
+ failures, the module will record the failure into the appropriate user
+ tally file.
+ </para>
+ <para>
+ The <emphasis>authsucc</emphasis> argument must be used when the module
+ is called after the modules which determine the authentication outcome,
+ succeeded. Unless the user is already blocked due to previous authentication
+ failures, the module will then clear the record of the failures in the
+ respective user tally file. Otherwise it will return authentication error.
+ If this call is not done, the pam_faillock will not distinguish between
+ consecutive and non-consecutive failed authentication attempts. The
+ <emphasis>preauth</emphasis> call must be used in such case. Due to
+ complications in the way the PAM stack can be configured it is also
+ possible to call <emphasis>pam_faillock</emphasis> as an account module.
+ In such configuration the module must be also called in the
+ <emphasis>preauth</emphasis> stage.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>conf=/path/to/config-file</option>
+ </term>
+ <listitem>
+ <para>
+ Use another configuration file instead of the default
+ <filename>/etc/security/faillock.conf</filename>.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ <para>
+ The options for configuring the module behavior are described in the
+ <citerefentry><refentrytitle>faillock.conf</refentrytitle><manvolnum>5</manvolnum>
+ </citerefentry> manual page. The options specified on the module command
+ line override the values from the configuration file.
+ </para>
+ </refsect1>
+
+ <refsect1 id="pam_faillock-types">
+ <title>MODULE TYPES PROVIDED</title>
+ <para>
+ The <option>auth</option> and <option>account</option> module types are
+ provided.
+ </para>
+ </refsect1>
+
+ <refsect1 id='pam_faillock-return_values'>
+ <title>RETURN VALUES</title>
+ <variablelist>
+ <varlistentry>
+ <term>PAM_AUTH_ERR</term>
+ <listitem>
+ <para>
+ An invalid option was given, the module was not able
+ to retrieve the user name, no valid counter file
+ was found, or too many failed logins.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_BUF_ERR</term>
+ <listitem>
+ <para>
+ Memory buffer error.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_CONV_ERR</term>
+ <listitem>
+ <para>
+ The conversation method supplied by the application
+ failed to obtain the username.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_INCOMPLETE</term>
+ <listitem>
+ <para>
+ The conversation method supplied by the application
+ returned PAM_CONV_AGAIN.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_SUCCESS</term>
+ <listitem>
+ <para>
+ Everything was successful.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_IGNORE</term>
+ <listitem>
+ <para>
+ User not present in passwd database.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id='pam_faillock-notes'>
+ <title>NOTES</title>
+ <para>
+ Configuring options on the module command line is not recommend. The
+ <filename>/etc/security/faillock.conf</filename> should be used instead.
+ </para>
+ <para>
+ The setup of <emphasis>pam_faillock</emphasis> in the PAM stack is different
+ from the <emphasis>pam_tally2</emphasis> module setup.
+ </para>
+ <para>
+ Individual files with the failure records are created as owned by
+ the user. This allows <emphasis remap='B'>pam_faillock.so</emphasis> module
+ to work correctly when it is called from a screensaver.
+ </para>
+ <para>
+ Note that using the module in <option>preauth</option> without the
+ <option>silent</option> option specified in <filename>/etc/security/faillock.conf</filename>
+ or with <emphasis>requisite</emphasis> control field leaks an information about
+ existence or non-existence of an user account in the system because
+ the failures are not recorded for the unknown users. The message
+ about the user account being locked is never displayed for non-existing
+ user accounts allowing the adversary to infer that a particular account
+ is not existing on a system.
+ </para>
+ </refsect1>
+
+ <refsect1 id='pam_faillock-examples'>
+ <title>EXAMPLES</title>
+ <para>
+ Here are two possible configuration examples for <filename>/etc/pam.d/login</filename>.
+ They make <emphasis>pam_faillock</emphasis> to lock the account after 4 consecutive
+ failed logins during the default interval of 15 minutes. Root account will be locked
+ as well. The accounts will be automatically unlocked after 20 minutes.
+ </para>
+ <para>
+ In the first example the module is called only in the <emphasis>auth</emphasis>
+ phase and the module does not print any information about the account being blocked
+ by <emphasis>pam_faillock</emphasis>. The <emphasis>preauth</emphasis> call can
+ be added to tell users that their logins are blocked by the module and also to abort
+ the authentication without even asking for password in such case.
+ </para>
+ <para>
+ <filename>/etc/security/faillock.conf</filename> file example:
+ </para>
+ <programlisting>
+deny=4
+unlock_time=1200
+silent
+ </programlisting>
+ <para>
+ /etc/pam.d/config file example:
+ </para>
+ <programlisting>
+auth required pam_securetty.so
+auth required pam_env.so
+auth required pam_nologin.so
+# optionally call: auth requisite pam_faillock.so preauth
+# to display the message about account being locked
+auth [success=1 default=bad] pam_unix.so
+auth [default=die] pam_faillock.so authfail
+auth sufficient pam_faillock.so authsucc
+auth required pam_deny.so
+account required pam_unix.so
+password required pam_unix.so shadow
+session required pam_selinux.so close
+session required pam_loginuid.so
+session required pam_unix.so
+session required pam_selinux.so open
+ </programlisting>
+ <para>
+ In the second example the module is called both in the <emphasis>auth</emphasis>
+ and <emphasis>account</emphasis> phases and the module informs the authenticating
+ user when the account is locked if <option>silent</option> option is not
+ specified in the <filename>faillock.conf</filename>.
+ </para>
+ <programlisting>
+auth required pam_securetty.so
+auth required pam_env.so
+auth required pam_nologin.so
+auth required pam_faillock.so preauth
+# optionally use requisite above if you do not want to prompt for the password
+# on locked accounts
+auth sufficient pam_unix.so
+auth [default=die] pam_faillock.so authfail
+auth required pam_deny.so
+account required pam_faillock.so
+# if you drop the above call to pam_faillock.so the lock will be done also
+# on non-consecutive authentication failures
+account required pam_unix.so
+password required pam_unix.so shadow
+session required pam_selinux.so close
+session required pam_loginuid.so
+session required pam_unix.so
+session required pam_selinux.so open
+ </programlisting>
+ </refsect1>
+
+ <refsect1 id="pam_faillock-files">
+ <title>FILES</title>
+ <variablelist>
+ <varlistentry>
+ <term><filename>/var/run/faillock/*</filename></term>
+ <listitem>
+ <para>the files logging the authentication failures for users</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><filename>/etc/security/faillock.conf</filename></term>
+ <listitem>
+ <para>the config file for pam_faillock options</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id='pam_faillock-see_also'>
+ <title>SEE ALSO</title>
+ <para>
+ <citerefentry>
+ <refentrytitle>faillock</refentrytitle><manvolnum>8</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>faillock.conf</refentrytitle><manvolnum>5</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_faillock-author'>
+ <title>AUTHOR</title>
+ <para>
+ pam_faillock was written by Tomas Mraz.
+ </para>
+ </refsect1>
+
+</refentry>
diff --git a/modules/pam_faillock/pam_faillock.c b/modules/pam_faillock/pam_faillock.c
new file mode 100644
index 0000000..f592d0a
--- /dev/null
+++ b/modules/pam_faillock/pam_faillock.c
@@ -0,0 +1,775 @@
+/*
+ * Copyright (c) 2010, 2017, 2019 Tomas Mraz <tmraz@redhat.com>
+ * Copyright (c) 2010, 2017, 2019 Red Hat, Inc.
+ *
+ * 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.
+ */
+
+#include "config.h"
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <errno.h>
+#include <time.h>
+#include <pwd.h>
+#include <syslog.h>
+#include <ctype.h>
+
+#ifdef HAVE_LIBAUDIT
+#include <libaudit.h>
+#endif
+
+#include <security/pam_modules.h>
+#include <security/pam_modutil.h>
+#include <security/pam_ext.h>
+
+#include "pam_inline.h"
+#include "faillock.h"
+
+#define FAILLOCK_ACTION_PREAUTH 0
+#define FAILLOCK_ACTION_AUTHSUCC 1
+#define FAILLOCK_ACTION_AUTHFAIL 2
+
+#define FAILLOCK_FLAG_DENY_ROOT 0x1
+#define FAILLOCK_FLAG_AUDIT 0x2
+#define FAILLOCK_FLAG_SILENT 0x4
+#define FAILLOCK_FLAG_NO_LOG_INFO 0x8
+#define FAILLOCK_FLAG_UNLOCKED 0x10
+#define FAILLOCK_FLAG_LOCAL_ONLY 0x20
+
+#define MAX_TIME_INTERVAL 604800 /* 7 days */
+#define FAILLOCK_CONF_MAX_LINELEN 1023
+
+#define PATH_PASSWD "/etc/passwd"
+
+static const char default_faillock_conf[] = FAILLOCK_DEFAULT_CONF;
+
+struct options {
+ unsigned int action;
+ unsigned int flags;
+ unsigned short deny;
+ unsigned int fail_interval;
+ unsigned int unlock_time;
+ unsigned int root_unlock_time;
+ char *dir;
+ const char *user;
+ char *admin_group;
+ int failures;
+ uint64_t latest_time;
+ uid_t uid;
+ int is_admin;
+ uint64_t now;
+ int fatal_error;
+};
+
+static int read_config_file(
+ pam_handle_t *pamh,
+ struct options *opts,
+ const char *cfgfile
+);
+
+static void set_conf_opt(
+ pam_handle_t *pamh,
+ struct options *opts,
+ const char *name,
+ const char *value
+);
+
+static int
+args_parse(pam_handle_t *pamh, int argc, const char **argv,
+ int flags, struct options *opts)
+{
+ int i;
+ int rv;
+ const char *conf = default_faillock_conf;
+
+ memset(opts, 0, sizeof(*opts));
+
+ opts->dir = strdup(FAILLOCK_DEFAULT_TALLYDIR);
+ opts->deny = 3;
+ opts->fail_interval = 900;
+ opts->unlock_time = 600;
+ opts->root_unlock_time = MAX_TIME_INTERVAL+1;
+
+ for (i = 0; i < argc; ++i) {
+ const char *str;
+
+ if ((str = pam_str_skip_prefix(argv[i], "conf=")) != NULL)
+ conf = str;
+ }
+
+ if ((rv = read_config_file(pamh, opts, conf)) != PAM_SUCCESS) {
+ pam_syslog(pamh, LOG_ERR,
+ "Configuration file missing or broken");
+ return rv;
+ }
+
+ for (i = 0; i < argc; ++i) {
+ if (strcmp(argv[i], "preauth") == 0) {
+ opts->action = FAILLOCK_ACTION_PREAUTH;
+ }
+ else if (strcmp(argv[i], "authfail") == 0) {
+ opts->action = FAILLOCK_ACTION_AUTHFAIL;
+ }
+ else if (strcmp(argv[i], "authsucc") == 0) {
+ opts->action = FAILLOCK_ACTION_AUTHSUCC;
+ }
+ else {
+ char buf[FAILLOCK_CONF_MAX_LINELEN + 1];
+ char *val;
+
+ strncpy(buf, argv[i], sizeof(buf) - 1);
+ buf[sizeof(buf) - 1] = '\0';
+
+ val = strchr(buf, '=');
+ if (val != NULL) {
+ *val = '\0';
+ ++val;
+ }
+ else {
+ val = buf + sizeof(buf) - 1;
+ }
+ set_conf_opt(pamh, opts, buf, val);
+ }
+ }
+
+ if (opts->root_unlock_time == MAX_TIME_INTERVAL+1)
+ opts->root_unlock_time = opts->unlock_time;
+ if (flags & PAM_SILENT)
+ opts->flags |= FAILLOCK_FLAG_SILENT;
+
+ if (opts->dir == NULL) {
+ pam_syslog(pamh, LOG_CRIT, "Error allocating memory: %m");
+ opts->fatal_error = 1;
+ }
+
+ if (opts->fatal_error)
+ return PAM_BUF_ERR;
+ return PAM_SUCCESS;
+}
+
+/* parse a single configuration file */
+static int
+read_config_file(pam_handle_t *pamh, struct options *opts, const char *cfgfile)
+{
+ FILE *f;
+ char linebuf[FAILLOCK_CONF_MAX_LINELEN+1];
+
+ f = fopen(cfgfile, "r");
+ if (f == NULL) {
+ /* ignore non-existent default config file */
+ if (errno == ENOENT && cfgfile == default_faillock_conf)
+ return PAM_SUCCESS;
+ return PAM_SERVICE_ERR;
+ }
+
+ while (fgets(linebuf, sizeof(linebuf), f) != NULL) {
+ size_t len;
+ char *ptr;
+ char *name;
+ int eq;
+
+ len = strlen(linebuf);
+ /* len cannot be 0 unless there is a bug in fgets */
+ if (len && linebuf[len - 1] != '\n' && !feof(f)) {
+ (void) fclose(f);
+ return PAM_SERVICE_ERR;
+ }
+
+ if ((ptr=strchr(linebuf, '#')) != NULL) {
+ *ptr = '\0';
+ } else {
+ ptr = linebuf + len;
+ }
+
+ /* drop terminating whitespace including the \n */
+ while (ptr > linebuf) {
+ if (!isspace(*(ptr-1))) {
+ *ptr = '\0';
+ break;
+ }
+ --ptr;
+ }
+
+ /* skip initial whitespace */
+ for (ptr = linebuf; isspace(*ptr); ptr++);
+ if (*ptr == '\0')
+ continue;
+
+ /* grab the key name */
+ eq = 0;
+ name = ptr;
+ while (*ptr != '\0') {
+ if (isspace(*ptr) || *ptr == '=') {
+ eq = *ptr == '=';
+ *ptr = '\0';
+ ++ptr;
+ break;
+ }
+ ++ptr;
+ }
+
+ /* grab the key value */
+ while (*ptr != '\0') {
+ if (*ptr != '=' || eq) {
+ if (!isspace(*ptr)) {
+ break;
+ }
+ } else {
+ eq = 1;
+ }
+ ++ptr;
+ }
+
+ /* set the key:value pair on opts */
+ set_conf_opt(pamh, opts, name, ptr);
+ }
+
+ (void)fclose(f);
+ return PAM_SUCCESS;
+}
+
+static void
+set_conf_opt(pam_handle_t *pamh, struct options *opts, const char *name, const char *value)
+{
+ if (strcmp(name, "dir") == 0) {
+ if (value[0] != '/') {
+ pam_syslog(pamh, LOG_ERR,
+ "Tally directory is not absolute path (%s); keeping default", value);
+ } else {
+ free(opts->dir);
+ opts->dir = strdup(value);
+ }
+ }
+ else if (strcmp(name, "deny") == 0) {
+ if (sscanf(value, "%hu", &opts->deny) != 1) {
+ pam_syslog(pamh, LOG_ERR,
+ "Bad number supplied for deny argument");
+ }
+ }
+ else if (strcmp(name, "fail_interval") == 0) {
+ unsigned int temp;
+ if (sscanf(value, "%u", &temp) != 1 ||
+ temp > MAX_TIME_INTERVAL) {
+ pam_syslog(pamh, LOG_ERR,
+ "Bad number supplied for fail_interval argument");
+ } else {
+ opts->fail_interval = temp;
+ }
+ }
+ else if (strcmp(name, "unlock_time") == 0) {
+ unsigned int temp;
+
+ if (strcmp(value, "never") == 0) {
+ opts->unlock_time = 0;
+ }
+ else if (sscanf(value, "%u", &temp) != 1 ||
+ temp > MAX_TIME_INTERVAL) {
+ pam_syslog(pamh, LOG_ERR,
+ "Bad number supplied for unlock_time argument");
+ }
+ else {
+ opts->unlock_time = temp;
+ }
+ }
+ else if (strcmp(name, "root_unlock_time") == 0) {
+ unsigned int temp;
+
+ if (strcmp(value, "never") == 0) {
+ opts->root_unlock_time = 0;
+ }
+ else if (sscanf(value, "%u", &temp) != 1 ||
+ temp > MAX_TIME_INTERVAL) {
+ pam_syslog(pamh, LOG_ERR,
+ "Bad number supplied for root_unlock_time argument");
+ } else {
+ opts->root_unlock_time = temp;
+ }
+ }
+ else if (strcmp(name, "admin_group") == 0) {
+ free(opts->admin_group);
+ opts->admin_group = strdup(value);
+ if (opts->admin_group == NULL) {
+ opts->fatal_error = 1;
+ pam_syslog(pamh, LOG_CRIT, "Error allocating memory: %m");
+ }
+ }
+ else if (strcmp(name, "even_deny_root") == 0) {
+ opts->flags |= FAILLOCK_FLAG_DENY_ROOT;
+ }
+ else if (strcmp(name, "audit") == 0) {
+ opts->flags |= FAILLOCK_FLAG_AUDIT;
+ }
+ else if (strcmp(name, "silent") == 0) {
+ opts->flags |= FAILLOCK_FLAG_SILENT;
+ }
+ else if (strcmp(name, "no_log_info") == 0) {
+ opts->flags |= FAILLOCK_FLAG_NO_LOG_INFO;
+ }
+ else if (strcmp(name, "local_users_only") == 0) {
+ opts->flags |= FAILLOCK_FLAG_LOCAL_ONLY;
+ }
+ else {
+ pam_syslog(pamh, LOG_ERR, "Unknown option: %s", name);
+ }
+}
+
+static int
+check_local_user (pam_handle_t *pamh, const char *user)
+{
+ struct passwd pw, *pwp;
+ char buf[16384];
+ int found = 0;
+ FILE *fp;
+ int errn;
+
+ fp = fopen(PATH_PASSWD, "r");
+ if (fp == NULL) {
+ pam_syslog(pamh, LOG_ERR, "unable to open %s: %m",
+ PATH_PASSWD);
+ return -1;
+ }
+
+ for (;;) {
+ errn = fgetpwent_r(fp, &pw, buf, sizeof (buf), &pwp);
+ if (errn == ERANGE) {
+ pam_syslog(pamh, LOG_WARNING, "%s contains very long lines; corrupted?",
+ PATH_PASSWD);
+ break;
+ }
+ if (errn != 0)
+ break;
+ if (strcmp(pwp->pw_name, user) == 0) {
+ found = 1;
+ break;
+ }
+ }
+
+ fclose (fp);
+
+ if (errn != 0 && errn != ENOENT) {
+ pam_syslog(pamh, LOG_ERR, "unable to enumerate local accounts: %m");
+ return -1;
+ } else {
+ return found;
+ }
+}
+
+static int
+get_pam_user(pam_handle_t *pamh, struct options *opts)
+{
+ const char *user;
+ int rv;
+ struct passwd *pwd;
+
+ if ((rv=pam_get_user(pamh, &user, NULL)) != PAM_SUCCESS) {
+ return rv == PAM_CONV_AGAIN ? PAM_INCOMPLETE : rv;
+ }
+
+ if (*user == '\0') {
+ return PAM_IGNORE;
+ }
+
+ if ((pwd=pam_modutil_getpwnam(pamh, user)) == NULL) {
+ if (opts->flags & FAILLOCK_FLAG_AUDIT) {
+ pam_syslog(pamh, LOG_NOTICE, "User unknown: %s", user);
+ }
+ else {
+ pam_syslog(pamh, LOG_NOTICE, "User unknown");
+ }
+ return PAM_IGNORE;
+ }
+ opts->user = user;
+ opts->uid = pwd->pw_uid;
+
+ if (pwd->pw_uid == 0) {
+ opts->is_admin = 1;
+ return PAM_SUCCESS;
+ }
+
+ if (opts->admin_group && *opts->admin_group) {
+ opts->is_admin = pam_modutil_user_in_group_uid_nam(pamh,
+ pwd->pw_uid, opts->admin_group);
+ }
+
+ return PAM_SUCCESS;
+}
+
+static int
+check_tally(pam_handle_t *pamh, struct options *opts, struct tally_data *tallies, int *fd)
+{
+ int tfd;
+ unsigned int i;
+ uint64_t latest_time;
+ int failures;
+
+ opts->now = time(NULL);
+
+ tfd = open_tally(opts->dir, opts->user, opts->uid, 0);
+
+ *fd = tfd;
+
+ if (tfd == -1) {
+ if (errno == EACCES || errno == ENOENT) {
+ return PAM_SUCCESS;
+ }
+ pam_syslog(pamh, LOG_ERR, "Error opening the tally file for %s: %m", opts->user);
+ return PAM_SYSTEM_ERR;
+ }
+
+ if (read_tally(tfd, tallies) != 0) {
+ pam_syslog(pamh, LOG_ERR, "Error reading the tally file for %s: %m", opts->user);
+ return PAM_SYSTEM_ERR;
+ }
+
+ if (opts->is_admin && !(opts->flags & FAILLOCK_FLAG_DENY_ROOT)) {
+ return PAM_SUCCESS;
+ }
+
+ latest_time = 0;
+ for (i = 0; i < tallies->count; i++) {
+ if ((tallies->records[i].status & TALLY_STATUS_VALID) &&
+ tallies->records[i].time > latest_time)
+ latest_time = tallies->records[i].time;
+ }
+
+ opts->latest_time = latest_time;
+
+ failures = 0;
+ for (i = 0; i < tallies->count; i++) {
+ if ((tallies->records[i].status & TALLY_STATUS_VALID) &&
+ latest_time - tallies->records[i].time < opts->fail_interval) {
+ ++failures;
+ }
+ }
+
+ opts->failures = failures;
+
+ if (opts->deny && failures >= opts->deny) {
+ if ((!opts->is_admin && opts->unlock_time && latest_time + opts->unlock_time < opts->now) ||
+ (opts->is_admin && opts->root_unlock_time && latest_time + opts->root_unlock_time < opts->now)) {
+#ifdef HAVE_LIBAUDIT
+ if (opts->action != FAILLOCK_ACTION_PREAUTH) { /* do not audit in preauth */
+ char buf[64];
+ int audit_fd;
+ const void *rhost = NULL, *tty = NULL;
+
+ audit_fd = audit_open();
+ /* If there is an error & audit support is in the kernel report error */
+ if ((audit_fd < 0) && !(errno == EINVAL || errno == EPROTONOSUPPORT ||
+ errno == EAFNOSUPPORT))
+ return PAM_SYSTEM_ERR;
+
+ (void)pam_get_item(pamh, PAM_TTY, &tty);
+ (void)pam_get_item(pamh, PAM_RHOST, &rhost);
+ snprintf(buf, sizeof(buf), "pam_faillock uid=%u ", opts->uid);
+ audit_log_user_message(audit_fd, AUDIT_RESP_ACCT_UNLOCK_TIMED, buf,
+ rhost, NULL, tty, 1);
+ }
+#endif
+ opts->flags |= FAILLOCK_FLAG_UNLOCKED;
+ return PAM_SUCCESS;
+ }
+ return PAM_AUTH_ERR;
+ }
+ return PAM_SUCCESS;
+}
+
+static void
+reset_tally(pam_handle_t *pamh, struct options *opts, int *fd)
+{
+ int rv;
+
+ if (*fd == -1) {
+ *fd = open_tally(opts->dir, opts->user, opts->uid, 1);
+ }
+ else {
+ while ((rv=ftruncate(*fd, 0)) == -1 && errno == EINTR);
+ if (rv == -1) {
+ pam_syslog(pamh, LOG_ERR, "Error clearing the tally file for %s: %m", opts->user);
+ }
+ }
+}
+
+static int
+write_tally(pam_handle_t *pamh, struct options *opts, struct tally_data *tallies, int *fd)
+{
+ struct tally *records;
+ unsigned int i;
+ int failures;
+ unsigned int oldest;
+ uint64_t oldtime;
+ const void *source = NULL;
+
+ if (*fd == -1) {
+ *fd = open_tally(opts->dir, opts->user, opts->uid, 1);
+ }
+ if (*fd == -1) {
+ if (errno == EACCES) {
+ return PAM_SUCCESS;
+ }
+ pam_syslog(pamh, LOG_ERR, "Error opening the tally file for %s: %m", opts->user);
+ return PAM_SYSTEM_ERR;
+ }
+
+ oldtime = 0;
+ oldest = 0;
+ failures = 0;
+
+ for (i = 0; i < tallies->count; ++i) {
+ if (oldtime == 0 || tallies->records[i].time < oldtime) {
+ oldtime = tallies->records[i].time;
+ oldest = i;
+ }
+ if (opts->flags & FAILLOCK_FLAG_UNLOCKED ||
+ opts->now - tallies->records[i].time >= opts->fail_interval ) {
+ tallies->records[i].status &= ~TALLY_STATUS_VALID;
+ } else {
+ ++failures;
+ }
+ }
+
+ if (oldest >= tallies->count || (tallies->records[oldest].status & TALLY_STATUS_VALID)) {
+ oldest = tallies->count;
+
+ if ((records=realloc(tallies->records, (oldest+1) * sizeof (*tallies->records))) == NULL) {
+ pam_syslog(pamh, LOG_CRIT, "Error allocating memory for tally records: %m");
+ return PAM_BUF_ERR;
+ }
+
+ ++tallies->count;
+ tallies->records = records;
+ }
+
+ memset(&tallies->records[oldest], 0, sizeof (*tallies->records));
+
+ tallies->records[oldest].status = TALLY_STATUS_VALID;
+ if (pam_get_item(pamh, PAM_RHOST, &source) != PAM_SUCCESS || source == NULL) {
+ if (pam_get_item(pamh, PAM_TTY, &source) != PAM_SUCCESS || source == NULL) {
+ if (pam_get_item(pamh, PAM_SERVICE, &source) != PAM_SUCCESS || source == NULL) {
+ source = "";
+ }
+ }
+ else {
+ tallies->records[oldest].status |= TALLY_STATUS_TTY;
+ }
+ }
+ else {
+ tallies->records[oldest].status |= TALLY_STATUS_RHOST;
+ }
+
+ strncpy(tallies->records[oldest].source, source, sizeof(tallies->records[oldest].source));
+ /* source does not have to be null terminated */
+
+ tallies->records[oldest].time = opts->now;
+
+ ++failures;
+
+ if (opts->deny && failures == opts->deny) {
+#ifdef HAVE_LIBAUDIT
+ char buf[64];
+ int audit_fd;
+
+ audit_fd = audit_open();
+ /* If there is an error & audit support is in the kernel report error */
+ if ((audit_fd < 0) && !(errno == EINVAL || errno == EPROTONOSUPPORT ||
+ errno == EAFNOSUPPORT))
+ return PAM_SYSTEM_ERR;
+
+ snprintf(buf, sizeof(buf), "pam_faillock uid=%u ", opts->uid);
+ audit_log_user_message(audit_fd, AUDIT_ANOM_LOGIN_FAILURES, buf,
+ NULL, NULL, NULL, 1);
+
+ if (!opts->is_admin || (opts->flags & FAILLOCK_FLAG_DENY_ROOT)) {
+ audit_log_user_message(audit_fd, AUDIT_RESP_ACCT_LOCK, buf,
+ NULL, NULL, NULL, 1);
+ }
+ close(audit_fd);
+#endif
+ if (!(opts->flags & FAILLOCK_FLAG_NO_LOG_INFO)) {
+ pam_syslog(pamh, LOG_INFO, "Consecutive login failures for user %s account temporarily locked",
+ opts->user);
+ }
+ }
+
+ if (update_tally(*fd, tallies) == 0)
+ return PAM_SUCCESS;
+
+ return PAM_SYSTEM_ERR;
+}
+
+static void
+faillock_message(pam_handle_t *pamh, struct options *opts)
+{
+ int64_t left;
+
+ if (!(opts->flags & FAILLOCK_FLAG_SILENT)) {
+ if (opts->is_admin) {
+ left = opts->latest_time + opts->root_unlock_time - opts->now;
+ }
+ else {
+ left = opts->latest_time + opts->unlock_time - opts->now;
+ }
+
+ pam_info(pamh, _("The account is locked due to %u failed logins."),
+ (unsigned int)opts->failures);
+ if (left > 0) {
+ left = (left + 59)/60; /* minutes */
+
+ pam_info(pamh, _("(%d minutes left to unlock)"), (int)left);
+ }
+ }
+}
+
+static void
+tally_cleanup(struct tally_data *tallies, int fd)
+{
+ if (fd != -1) {
+ close(fd);
+ }
+
+ free(tallies->records);
+}
+
+static void
+opts_cleanup(struct options *opts)
+{
+ free(opts->dir);
+ free(opts->admin_group);
+}
+
+/*---------------------------------------------------------------------*/
+
+int
+pam_sm_authenticate(pam_handle_t *pamh, int flags,
+ int argc, const char **argv)
+{
+ struct options opts;
+ int rv, fd = -1;
+ struct tally_data tallies;
+
+ memset(&tallies, 0, sizeof(tallies));
+
+ rv = args_parse(pamh, argc, argv, flags, &opts);
+ if (rv != PAM_SUCCESS)
+ goto err;
+
+ pam_fail_delay(pamh, 2000000); /* 2 sec delay on failure */
+
+ if ((rv=get_pam_user(pamh, &opts)) != PAM_SUCCESS) {
+ goto err;
+ }
+
+ if (!(opts.flags & FAILLOCK_FLAG_LOCAL_ONLY) ||
+ check_local_user (pamh, opts.user) != 0) {
+ switch (opts.action) {
+ case FAILLOCK_ACTION_PREAUTH:
+ rv = check_tally(pamh, &opts, &tallies, &fd);
+ if (rv == PAM_AUTH_ERR && !(opts.flags & FAILLOCK_FLAG_SILENT)) {
+ faillock_message(pamh, &opts);
+ }
+ break;
+
+ case FAILLOCK_ACTION_AUTHSUCC:
+ rv = check_tally(pamh, &opts, &tallies, &fd);
+ if (rv == PAM_SUCCESS) {
+ reset_tally(pamh, &opts, &fd);
+ }
+ break;
+
+ case FAILLOCK_ACTION_AUTHFAIL:
+ rv = check_tally(pamh, &opts, &tallies, &fd);
+ if (rv == PAM_SUCCESS) {
+ rv = PAM_IGNORE; /* this return value should be ignored */
+ write_tally(pamh, &opts, &tallies, &fd);
+ }
+ break;
+ }
+ }
+
+ tally_cleanup(&tallies, fd);
+
+err:
+ opts_cleanup(&opts);
+
+ return rv;
+}
+
+/*---------------------------------------------------------------------*/
+
+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,
+ int argc, const char **argv)
+{
+ struct options opts;
+ int rv, fd = -1;
+ struct tally_data tallies;
+
+ memset(&tallies, 0, sizeof(tallies));
+
+ rv = args_parse(pamh, argc, argv, flags, &opts);
+
+ if (rv != PAM_SUCCESS)
+ goto err;
+
+ opts.action = FAILLOCK_ACTION_AUTHSUCC;
+
+ if ((rv=get_pam_user(pamh, &opts)) != PAM_SUCCESS) {
+ goto err;
+ }
+
+ if (!(opts.flags & FAILLOCK_FLAG_LOCAL_ONLY) ||
+ check_local_user (pamh, opts.user) != 0) {
+ check_tally(pamh, &opts, &tallies, &fd); /* for auditing */
+ reset_tally(pamh, &opts, &fd);
+ }
+
+ tally_cleanup(&tallies, fd);
+
+err:
+ opts_cleanup(&opts);
+
+ return rv;
+}
+
+/*-----------------------------------------------------------------------*/
diff --git a/modules/pam_faillock/tst-pam_faillock b/modules/pam_faillock/tst-pam_faillock
new file mode 100755
index 0000000..ec454c2
--- /dev/null
+++ b/modules/pam_faillock/tst-pam_faillock
@@ -0,0 +1,2 @@
+#!/bin/sh
+../../tests/tst-dlopen .libs/pam_faillock.so