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+<?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_tally2">
+
+ <refmeta>
+ <refentrytitle>pam_tally2</refentrytitle>
+ <manvolnum>8</manvolnum>
+ <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo>
+ </refmeta>
+
+ <refnamediv id="pam_tally2-name">
+ <refname>pam_tally2</refname>
+ <refpurpose>The login counter (tallying) module</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <cmdsynopsis id="pam_tally2-cmdsynopsis1">
+ <command>pam_tally2.so</command>
+ <arg choice="opt">
+ file=<replaceable>/path/to/counter</replaceable>
+ </arg>
+ <arg choice="opt">
+ onerr=[<replaceable>fail</replaceable>|<replaceable>succeed</replaceable>]
+ </arg>
+ <arg choice="opt">
+ magic_root
+ </arg>
+ <arg choice="opt">
+ even_deny_root
+ </arg>
+ <arg choice="opt">
+ deny=<replaceable>n</replaceable>
+ </arg>
+ <arg choice="opt">
+ lock_time=<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">
+ serialize
+ </arg>
+ <arg choice="opt">
+ audit
+ </arg>
+ <arg choice="opt">
+ silent
+ </arg>
+ <arg choice="opt">
+ no_log_info
+ </arg>
+ <arg choice="opt">
+ debug
+ </arg>
+ </cmdsynopsis>
+ <cmdsynopsis id="pam_tally2-cmdsynopsis2">
+ <command>pam_tally2</command>
+ <arg choice="opt">
+ --file <replaceable>/path/to/counter</replaceable>
+ </arg>
+ <arg choice="opt">
+ --user <replaceable>username</replaceable>
+ </arg>
+ <arg choice="opt">
+ --reset[=<replaceable>n</replaceable>]
+ </arg>
+ <arg choice="opt">
+ --quiet
+ </arg>
+ </cmdsynopsis>
+ </refsynopsisdiv>
+
+ <refsect1 id="pam_tally2-description">
+
+ <title>DESCRIPTION</title>
+
+ <para>
+ This module maintains a count of attempted accesses, can
+ reset count on success, can deny access if too many attempts fail.
+ </para>
+ <para>
+ pam_tally2 comes in two parts:
+ <emphasis remap='B'>pam_tally2.so</emphasis> and
+ <command>pam_tally2</command>. The former is the PAM module and
+ the latter, a stand-alone program. <command>pam_tally2</command>
+ is an (optional) application which can be used to interrogate and
+ manipulate the counter file. It can display user counts, set
+ individual counts, or clear all counts. Setting artificially high
+ counts may be useful for blocking users without changing their
+ passwords. For example, one might find it useful to clear all counts
+ every midnight from a cron job.
+ </para>
+ <para>
+ Normally, failed attempts to access <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_tally2-options">
+
+ <title>OPTIONS</title>
+ <variablelist>
+ <varlistentry>
+ <term>
+ GLOBAL OPTIONS
+ </term>
+ <listitem>
+ <para>
+ This can be used for <emphasis>auth</emphasis> and
+ <emphasis>account</emphasis> module types.
+ </para>
+ <variablelist>
+ <varlistentry>
+ <term>
+ <option>onerr=[<replaceable>fail</replaceable>|<replaceable>succeed</replaceable>]</option>
+ </term>
+ <listitem>
+ <para>
+ If something weird happens (like unable to open the file),
+ return with <errorcode>PAM_SUCCESS</errorcode> if
+ <option>onerr=<replaceable>succeed</replaceable></option>
+ is given, else with the corresponding PAM error code.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>file=<replaceable>/path/to/counter</replaceable></option>
+ </term>
+ <listitem>
+ <para>
+ File where to keep counts. Default is
+ <filename>/var/log/tallylog</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. The messages printed without the <emphasis>silent</emphasis> option leak presence of accounts on the system because they are not printed for non-existing accounts.
+ </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>debug</option>
+ </term>
+ <listitem>
+ <para>
+ Always log tally count when it is incremented as a debug level message to the system log.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term>
+ AUTH OPTIONS
+ </term>
+ <listitem>
+ <para>
+ Authentication phase first increments attempted login counter and
+ checks if user should be denied access. If the user is authenticated
+ and the login process continues on call to <citerefentry>
+ <refentrytitle>pam_setcred</refentrytitle><manvolnum>3</manvolnum>
+ </citerefentry> it resets the attempts counter.
+ </para>
+ <variablelist>
+ <varlistentry>
+ <term>
+ <option>deny=<replaceable>n</replaceable></option>
+ </term>
+ <listitem>
+ <para>
+ Deny access if tally for this user exceeds
+ <replaceable>n</replaceable>.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>lock_time=<replaceable>n</replaceable></option>
+ </term>
+ <listitem>
+ <para>
+ Always deny for <replaceable>n</replaceable> seconds
+ after failed attempt.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>unlock_time=<replaceable>n</replaceable></option>
+ </term>
+ <listitem>
+ <para>
+ Allow access after <replaceable>n</replaceable> seconds
+ after failed attempt. If this option is used the user will
+ be locked out for the specified amount of time after he
+ exceeded his maximum allowed attempts. Otherwise the
+ account is locked until the lock is removed by a manual
+ intervention of the system administrator.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>magic_root</option>
+ </term>
+ <listitem>
+ <para>
+ If the module is invoked by a user with uid=0 the
+ counter is not incremented. The sysadmin should use this
+ for user launched services, like <command>su</command>,
+ otherwise this argument should be omitted.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>even_deny_root</option>
+ </term>
+ <listitem>
+ <para>
+ Root account can become unavailable.
+ </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 failed attempt. If this option is used
+ the root user will be locked out for the specified amount of
+ time after he exceeded his maximum allowed attempts.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>
+ <option>serialize</option>
+ </term>
+ <listitem>
+ <para>
+ Serialize access to the tally file using locks. This option might
+ be used only for non-multithreaded services because it depends on
+ the fcntl locking of the tally file. Also it is a good idea to use
+ this option only in such configurations where the time between auth
+ phase and account or setcred phase is not dependent on the
+ authenticating client. Otherwise the authenticating client will be
+ able to prevent simultaneous authentications by the same user by
+ simply artificially prolonging the time the file record lock is held.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </listitem>
+ </varlistentry>
+
+
+ <varlistentry>
+ <term>
+ ACCOUNT OPTIONS
+ </term>
+ <listitem>
+ <para>
+ Account phase resets attempts counter if the user is
+ <emphasis remap='B'>not</emphasis> magic root.
+ This phase can be used optionally for services which don't call
+ <citerefentry>
+ <refentrytitle>pam_setcred</refentrytitle><manvolnum>3</manvolnum>
+ </citerefentry> correctly or if the reset should be done regardless
+ of the failure of the account phase of other modules.
+ </para>
+ <variablelist>
+ <varlistentry>
+ <term>
+ <option>magic_root</option>
+ </term>
+ <listitem>
+ <para>
+ If the module is invoked by a user with uid=0 the
+ counter is not changed. The sysadmin should use this
+ for user launched services, like <command>su</command>,
+ otherwise this argument should be omitted.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id="pam_tally2-types">
+ <title>MODULE TYPES PROVIDED</title>
+ <para>
+ The <option>auth</option> and <option>account</option>
+ module types are provided.
+ </para>
+ </refsect1>
+
+ <refsect1 id='pam_tally2-return_values'>
+ <title>RETURN VALUES</title>
+ <variablelist>
+ <varlistentry>
+ <term>PAM_AUTH_ERR</term>
+ <listitem>
+ <para>
+ A 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_SUCCESS</term>
+ <listitem>
+ <para>
+ Everything was successful.
+ </para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term>PAM_USER_UNKNOWN</term>
+ <listitem>
+ <para>
+ User not known.
+ </para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id='pam_tally2-notes'>
+ <title>NOTES</title>
+ <para>
+ pam_tally2 is not compatible with the old pam_tally faillog file format.
+ This is caused by requirement of compatibility of the tallylog file
+ format between 32bit and 64bit architectures on multiarch systems.
+ </para>
+ <para>
+ There is no setuid wrapper for access to the data file such as when the
+ <emphasis remap='B'>pam_tally2.so</emphasis> module is called from
+ xscreensaver. As this would make it impossible to share PAM configuration
+ with such services the following workaround is used: If the data file
+ cannot be opened because of insufficient permissions
+ (<errorcode>EACCES</errorcode>) the module returns
+ <errorcode>PAM_IGNORE</errorcode>.
+ </para>
+ </refsect1>
+
+ <refsect1 id='pam_tally2-examples'>
+ <title>EXAMPLES</title>
+ <para>
+ Add the following line to <filename>/etc/pam.d/login</filename> to
+ lock the account after 4 failed logins. Root account will be locked
+ as well. The accounts will be automatically unlocked after 20 minutes.
+ The module does not have to be called in the account phase because the
+ <command>login</command> calls <citerefentry>
+ <refentrytitle>pam_setcred</refentrytitle><manvolnum>3</manvolnum>
+ </citerefentry> correctly.
+ </para>
+ <programlisting>
+auth required pam_securetty.so
+auth required pam_tally2.so deny=4 even_deny_root unlock_time=1200
+auth required pam_env.so
+auth required pam_unix.so
+auth required pam_nologin.so
+account required pam_unix.so
+password required pam_unix.so
+session required pam_limits.so
+session required pam_unix.so
+session required pam_lastlog.so nowtmp
+session optional pam_mail.so standard
+ </programlisting>
+ </refsect1>
+
+ <refsect1 id="pam_tally2-files">
+ <title>FILES</title>
+ <variablelist>
+ <varlistentry>
+ <term><filename>/var/log/tallylog</filename></term>
+ <listitem>
+ <para>failure count logging file</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ </refsect1>
+
+ <refsect1 id='pam_tally2-see_also'>
+ <title>SEE ALSO</title>
+ <para>
+ <citerefentry>
+ <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>pam.d</refentrytitle><manvolnum>5</manvolnum>
+ </citerefentry>,
+ <citerefentry>
+ <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum>
+ </citerefentry>
+ </para>
+ </refsect1>
+
+ <refsect1 id='pam_tally2-author'>
+ <title>AUTHOR</title>
+ <para>
+ pam_tally2 was written by Tim Baverstock and Tomas Mraz.
+ </para>
+ </refsect1>
+
+</refentry>