samba-mirror/docs-xml/manpages/pam_winbind.8.xml

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<!DOCTYPE refentry PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
<refentry id="pam_winbind.8">

<refmeta>
	<refentrytitle>pam_winbind</refentrytitle>
	<manvolnum>8</manvolnum>
	<refmiscinfo class="source">Samba</refmiscinfo>
	<refmiscinfo class="manual">8</refmiscinfo>
	<refmiscinfo class="version">&doc.version;</refmiscinfo>
</refmeta>


<refnamediv>
	<refname>pam_winbind</refname>
	<refpurpose>PAM module for Winbind</refpurpose>
</refnamediv>

<refsect1>
	<title>DESCRIPTION</title>

	<para>This tool is part of the <citerefentry><refentrytitle>samba</refentrytitle>
	<manvolnum>7</manvolnum></citerefentry> suite.</para>

	<para>
	pam_winbind is a PAM module that can authenticate users against the local domain by talking to the Winbind daemon.
	</para>

</refsect1>

<refsect1>
	<title>SYNOPSIS</title>

	<para>
		Edit the PAM system config /etc/pam.d/service and modify it as the following example shows:
		<programlisting>
			    ...
			    auth      required        pam_env.so
			    auth      sufficient      pam_unix2.so
			+++ auth      required        pam_winbind.so  use_first_pass
			    account   requisite       pam_unix2.so
			+++ account   required        pam_winbind.so  use_first_pass
			+++ password  sufficient      pam_winbind.so
			    password  requisite       pam_pwcheck.so  cracklib
			    password  required        pam_unix2.so    use_authtok
			    session   required        pam_unix2.so
			+++ session   required        pam_winbind.so
			    ...
		</programlisting>

		Make sure that pam_winbind is one of the first modules in the session part. It may retrieve
		kerberos tickets which are needed by other modules.
	</para>
</refsect1>

<refsect1>
	<title>OPTIONS</title>
	<para>
	
		pam_winbind supports several options which can either be set in
		the PAM configuration files or in the pam_winbind configuration
		file situated at
		<filename>/etc/security/pam_winbind.conf</filename>. Options
		from the PAM configuration file take precedence to those from
		the configuration file. See
		<citerefentry><refentrytitle>pam_winbind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
		for further details.

		<variablelist>

		<varlistentry>
		<term>debug</term>
		<listitem><para>Gives debugging output to syslog.</para></listitem>
		</varlistentry>

		<varlistentry>
		<term>debug_state</term>
		<listitem><para>Gives detailed PAM state debugging output to syslog.</para></listitem>
		</varlistentry>

		<varlistentry>
		<term>require_membership_of=[SID or NAME]</term>
		<listitem><para>
		If this option is set, pam_winbind will only succeed if the user is a member of the given SID or NAME. A SID
		can be either a group-SID, an alias-SID or even an user-SID. It is also possible to give a NAME instead of the
		SID. That name must have the form: <parameter>MYDOMAIN\mygroup</parameter> or
		<parameter>MYDOMAIN\myuser</parameter> (where '\' character corresponds to the value of
		<parameter>winbind separator</parameter> parameter). It is also possible to use a UPN in the form
		<parameter>user@REALM</parameter> or <parameter>group@REALM</parameter>. pam_winbind will, in that case, lookup
		the SID internally. Note that NAME may not contain any spaces. It is thus recommended to only use SIDs. You can
		verify the list of SIDs a user is a member of with <command>wbinfo --user-sids=SID</command>.
		</para>

		<para>
		This option must only be specified on a auth
		module declaration, as it only operates in conjunction
		with password authentication.
		</para>
		</listitem>
		</varlistentry>

		<varlistentry>
		<term>use_first_pass</term>
		<listitem><para>
		By default, pam_winbind tries to get the authentication token from a previous module. If no token is available
		it asks the user for the old password. With this option, pam_winbind aborts with an error if no authentication
		token from a previous module is available.
		</para></listitem>
		</varlistentry>

		<varlistentry>
		<term>try_first_pass</term>
		<listitem><para>
				Same as the use_first_pass option (previous item), except that if the primary password is not
				valid, PAM will prompt for a password.
		</para></listitem>
		</varlistentry>

		<varlistentry>
		<term>use_authtok</term>
		<listitem><para>
		Set the new password to the one provided by the previously stacked password module. If this option is not set 
		pam_winbind will ask the user for the new password.
		</para></listitem>
		</varlistentry>

		<varlistentry>
		<term>try_authtok</term>
		<listitem><para>
		Same as the use_authtok option (previous item), except that if the new password is not
		valid, PAM will prompt for a password.
		</para></listitem>
		</varlistentry>

		<varlistentry>
		<term>krb5_auth</term>
		<listitem><para>

		pam_winbind can authenticate using Kerberos when winbindd is
		talking to an Active Directory domain controller. Kerberos
		authentication must be enabled with this parameter. When
		Kerberos authentication can not succeed (e.g. due to clock
		skew), winbindd will fallback to samlogon authentication over
		MSRPC. When this parameter is used in conjunction with
		<parameter>winbind refresh tickets</parameter>, winbind will
		keep your Ticket Granting Ticket (TGT) up-to-date by refreshing
		it whenever necessary.

		</para></listitem>
		</varlistentry>

		<varlistentry>
		<term>krb5_ccache_type=[type]</term>
		<listitem><para>

		When pam_winbind is configured to try kerberos authentication
		by enabling the <parameter>krb5_auth</parameter> option, it can
		store the retrieved Ticket Granting Ticket (TGT) in a
		credential cache. The type of credential cache can be
		controlled with this option.  The supported values are:
		<parameter>KCM</parameter> or <parameter>KEYRING</parameter>
		(when supported by the system's Kerberos library and
		operating system),
		<parameter>FILE</parameter> and <parameter>DIR</parameter>
		(when the DIR type is supported by the system's Kerberos
		library). In case of FILE a credential cache in the form of
		/tmp/krb5cc_UID will be created -  in case of DIR you NEED
		to specify a directory which must exist, the UID directory
		will be created in the specified directory.
		In all cases UID is replaced with the numeric user id.
		Check the details of the Kerberos implementation.</para>

		<para>When using the KEYRING type, the supported mechanism is
		<quote>KEYRING:persistent:UID</quote>, which uses the Linux
		kernel keyring to store credentials on a per-UID basis.
		KEYRING has limitations. For example, it is secure kernel memory,
		so bulk storage of credentials is not possible.</para>

		<para>When using the KCM type, the supported mechanism is
		<quote>KCM:UID</quote>, which uses a Kerberos credential
		manager to store credentials on a per-UID basis similar to
		KEYRING. This is the recommended choice on latest Linux
		distributions that offer a Kerberos Credential Manager. If not,
		we suggest to use KEYRING, as those are the most secure and
		predictable method.</para>

		<para>It is also possible to define custom filepaths and use the "%u"
		pattern in order to substitute the numeric user id.
		Examples:</para>

		<variablelist>
			<varlistentry>
				<term>krb5_ccache_type = DIR:/run/user/%u/krb5cc</term>
					<listitem><para>This will create a credential cache file in the specified directory.</para></listitem>
			</varlistentry>
			<varlistentry>
				<term>krb5_ccache_type = FILE:/tmp/krb5cc_%u</term>
					<listitem><para>This will create a credential cache file.</para></listitem>
			</varlistentry>
		</variablelist>

		<para>Leave empty to just do kerberos authentication without
		having a ticket cache after the logon has succeeded.
		This setting is empty by default.</para>
		</listitem>
		</varlistentry>

		<varlistentry>
		<term>cached_login</term>
		<listitem><para>
		Winbind allows one to logon using cached credentials when <parameter>winbind offline logon</parameter> is enabled. To use this feature from the PAM module this option must be set.
		</para></listitem>
		</varlistentry>

		<varlistentry>
		<term>silent</term>
		<listitem><para>
		Do not emit any messages.
		</para></listitem>
		</varlistentry>

		<varlistentry>
		<term>mkhomedir</term>
		<listitem><para>
		Create homedirectory for a user on-the-fly, option is valid in
		PAM session block.
		</para></listitem>
		</varlistentry>

		<varlistentry>
		<term>warn_pwd_expire</term>
		<listitem><para>
		Defines number of days before pam_winbind starts to warn about passwords that are
		going to expire. Defaults to 14 days.
		</para></listitem>
		</varlistentry>

		</variablelist>

	</para>

</refsect1>

<refsect1>
	<title>PAM DATA EXPORTS</title>

	<para>This section describes the data exported in the PAM stack which could be used in other PAM modules.</para>

	<varlistentry>
		<term>PAM_WINBIND_HOMEDIR</term>
		<listitem>
			<para>
				This is the Windows Home Directory set in the profile tab in the user settings
				on the Active Directory Server. This could be a local path or a directory on a
				share mapped to a drive.
			</para>
		</listitem>
	</varlistentry>
	<varlistentry>
		<term>PAM_WINBIND_LOGONSCRIPT</term>
		<listitem>
			<para>
				The path to the logon script which should be executed if a user logs in. This is
				normally a relative path to the script stored on the server.
			</para>
		</listitem>
	</varlistentry>
	<varlistentry>
		<term>PAM_WINBIND_LOGONSERVER</term>
		<listitem>
			<para>
				This exports the Active Directory server we are authenticating against. This can be
				used as a variable later.
			</para>
		</listitem>
	</varlistentry>
	<varlistentry>
		<term>PAM_WINBIND_PROFILEPATH</term>
		<listitem>
			<para>
				This is the profile path set in the profile tab in the user settings. Normally
				the home directory is synced with this directory on a share.
			</para>
		</listitem>
	</varlistentry>
</refsect1>

<refsect1>
	<title>SEE ALSO</title>
	<para><citerefentry>
	<refentrytitle>pam_winbind.conf</refentrytitle>
	<manvolnum>5</manvolnum></citerefentry>, <citerefentry>
	<refentrytitle>wbinfo</refentrytitle>
	<manvolnum>1</manvolnum></citerefentry>, <citerefentry>
	<refentrytitle>winbindd</refentrytitle>
	<manvolnum>8</manvolnum></citerefentry>, <citerefentry>
	<refentrytitle>smb.conf</refentrytitle>
	<manvolnum>5</manvolnum></citerefentry></para>
</refsect1>

<refsect1>
	<title>VERSION</title>

	<para>This man page is part of version &doc.version; of Samba.</para>
</refsect1>

<refsect1>
	<title>AUTHOR</title>
	
	<para>
	The original Samba software and related utilities were created by Andrew Tridgell. Samba is now developed by
	the Samba Team as an Open Source project similar to the way the Linux kernel is developed.
	</para>
	
	<para>This manpage was written by Jelmer Vernooij and Guenther Deschner.</para>

</refsect1>

</refentry>