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Diffstat (limited to 'modules/pam_unix/pam_unix.8.xml')
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diff --git a/modules/pam_unix/pam_unix.8.xml b/modules/pam_unix/pam_unix.8.xml new file mode 100644 index 00000000..25a705c1 --- /dev/null +++ b/modules/pam_unix/pam_unix.8.xml @@ -0,0 +1,340 @@ +<?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_unix"> + + <refmeta> + <refentrytitle>pam_unix</refentrytitle> + <manvolnum>8</manvolnum> + <refmiscinfo class="sectdesc">Linux-PAM Manual</refmiscinfo> + </refmeta> + + <refnamediv id="pam_unix-name"> + <refname>pam_unix</refname> + <refpurpose>Module for traditional password authentication</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis id="pam_unix-cmdsynopsis"> + <command>pam_unix.so</command> + <arg choice="opt"> + ... + </arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1 id="pam_unix-description"> + + <title>DESCRIPTION</title> + + <para> + This is the standard Unix authentication module. It uses standard + calls from the system's libraries to retrieve and set account + information as well as authentication. Usually this is obtained + from the /etc/passwd and the /etc/shadow file as well if shadow is + enabled. + </para> + + <para> + The account component performs the task of establishing the status + of the user's account and password based on the following + <emphasis>shadow</emphasis> elements: expire, last_change, max_change, + min_change, warn_change. In the case of the latter, it may offer advice + to the user on changing their password or, through the + <emphasis remap='B'>PAM_AUTHTOKEN_REQD</emphasis> return, delay + giving service to the user until they have established a new password. + The entries listed above are documented in the <citerefentry> + <refentrytitle>shadow</refentrytitle><manvolnum>5</manvolnum> + </citerefentry> manual page. Should the user's record not contain + one or more of these entries, the corresponding + <emphasis>shadow</emphasis> check is not performed. + </para> + + <para> + The authentication component performs the task of checking the + users credentials (password). The default action of this module + is to not permit the user access to a service if their official + password is blank. + </para> + + <para> + A helper binary, <citerefentry> + <refentrytitle>unix_chkpwd</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, is provided + to check the user's password when it is stored in a read + protected database. This binary is very simple and will only + check the password of the user invoking it. It is called + transparently on behalf of the user by the authenticating + component of this module. In this way it is possible + for applications like <command>xlock</command> to work without + being setuid-root. The module, by default, will temporarily turn + off SIGCHLD handling for the duration of execution of the helper + binary. This is generally the right thing to do, as many applications + are not prepared to handle this signal from a child they didn't know + was <function>fork()</function>d. The <option>noreap</option> module + argument can be used to suppress this temporary shielding and may be + needed for use with certain applications. + </para> + + <para> + The password component of this module performs the task of updating + the user's password. + </para> + + <para> + The session component of this module logs when a user logins + or leave the system. + </para> + + <para> + Remaining arguments, supported by others functions of this + module, are silently ignored. Other arguments are logged as + errors through <citerefentry> + <refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum> + </citerefentry>. + </para> + </refsect1> + + <refsect1 id="pam_unix-options"> + + <title>OPTIONS</title> + <variablelist> + <varlistentry> + <term> + <option>debug</option> + </term> + <listitem> + <para> + Turns on debugging via + <citerefentry> + <refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum> + </citerefentry>. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>audit</option> + </term> + <listitem> + <para> + A little more extreme than debug. + </para> + </listitem> + </varlistentry> + + <varlistentry> + <term> + <option>nullok</option> + </term> + <listitem> + <para> + The default action of this module is to not permit the + user access to a service if their official password is blank. + The <option>nullok</option> argument overrides this default. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>try_first_pass</option> + </term> + <listitem> + <para> + Before prompting the user for their password, the module first + tries the previous stacked module's password in case that + satisfies this module as well. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>use_first_pass</option> + </term> + <listitem> + <para> + The argument <option>use_first_pass</option> forces the module + to use a previous stacked modules password and will never prompt + the user - if no password is available or the password is not + appropriate, the user will be denied access. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>nodelay</option> + </term> + <listitem> + <para> + This argument can be used to discourage the authentication + component from requesting a delay should the authentication + as a whole fail. The default action is for the module to + request a delay-on-failure of the order of two second. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>use_authtok</option> + </term> + <listitem> + <para> + When password changing enforce the module to set the new + password to the one provided by a previously stacked + <option>password</option> module (this is used in the + example of the stacking of the <command>pam_cracklib</command> + module documented above). + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>not_set_pass</option> + </term> + <listitem> + <para> + This argument is used to inform the module that it is not to + pay attention to/make available the old or new passwords from/to + other (stacked) password modules. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>nis</option> + </term> + <listitem> + <para> + NIS RPC is used for setting new passwords. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>remember=<replaceable>n</replaceable></option> + </term> + <listitem> + <para> + The last <replaceable>n</replaceable> passwords for each + user are saved in <filename>/etc/security/opasswd</filename> + in order to force password change history and keep the user + from alternating between the same password too frequently. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>shadow</option> + </term> + <listitem> + <para> + Try to maintain a shadow based system. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>md5</option> + </term> + <listitem> + <para> + When a user changes their password next, encrypt + it with the MD5 algorithm. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>bigcrypt</option> + </term> + <listitem> + <para> + When a user changes their password next, + encrypt it with the DEC C2 algorithm. + </para> + </listitem> + </varlistentry> + <varlistentry> + <term> + <option>broken_shadow</option> + </term> + <listitem> + <para> + Ignore errors reading shadow inforation for + users in the account management module. + </para> + </listitem> + </varlistentry> + </variablelist> + <para> + Invalid arguments are logged with <citerefentry> + <refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum> + </citerefentry>. + </para> + </refsect1> + + <refsect1 id="pam_unix-services"> + <title>MODULE SERVICES PROVIDED</title> + <para> + All service are supported. + </para> + </refsect1> + + <refsect1 id='pam_unix-return_values'> + <title>RETURN VALUES</title> + <variablelist> + <varlistentry> + <term>PAM_IGNORE</term> + <listitem> + <para> + Ignore this module. + </para> + </listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1 id='pam_unix-examples'> + <title>EXAMPLES</title> + <para> + An example usage for <filename>/etc/pam.d/login</filename> + would be: + <programlisting> +# Authenticate the user +auth required pam_unix.so +# Ensure users account and password are still active +account required pam_unix.so +# Change the users password, but at first check the strength +# with pam_cracklib(8) +password required pam_cracklib.so retry=3 minlen=6 difok=3 +password required pam_unix.so use_authtok nullok md5 +session required pam_unix.so + </programlisting> + </para> + </refsect1> + + <refsect1 id='pam_unix-see_also'> + <title>SEE ALSO</title> + <para> + <citerefentry> + <refentrytitle>pam.conf</refentrytitle><manvolnum>5</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam.d</refentrytitle><manvolnum>8</manvolnum> + </citerefentry>, + <citerefentry> + <refentrytitle>pam</refentrytitle><manvolnum>8</manvolnum> + </citerefentry> + </para> + </refsect1> + + <refsect1 id='pam_unix-author'> + <title>AUTHOR</title> + <para> + pam_unix was written by various people. + </para> + </refsect1> + +</refentry> |