1 <?xml version="1.0" encoding="iso-8859-1"?>
2 <!DOCTYPE refentry PUBLIC "-//Samba-Team//DTD DocBook V4.2-Based Variant V1.0//EN" "http://www.samba.org/samba/DTD/samba-doc">
3 <refentry id="pam_winbind.8">
6 <refentrytitle>pam_winbind</refentrytitle>
7 <manvolnum>8</manvolnum>
8 <refmiscinfo class="source">Samba</refmiscinfo>
9 <refmiscinfo class="manual">8</refmiscinfo>
10 <refmiscinfo class="version">&doc.version;</refmiscinfo>
15 <refname>pam_winbind</refname>
16 <refpurpose>PAM module for Winbind</refpurpose>
20 <title>DESCRIPTION</title>
22 <para>This tool is part of the <citerefentry><refentrytitle>samba</refentrytitle>
23 <manvolnum>7</manvolnum></citerefentry> suite.</para>
26 pam_winbind is a PAM module that can authenticate users against the local domain by talking to the Winbind daemon.
32 <title>SYNOPSIS</title>
35 Edit the PAM system config /etc/pam.d/service and modify it as the following example shows:
38 auth required pam_env.so
39 auth sufficient pam_unix2.so
40 +++ auth required pam_winbind.so use_first_pass
41 account requisite pam_unix2.so
42 +++ account required pam_winbind.so use_first_pass
43 +++ password sufficient pam_winbind.so
44 password requisite pam_pwcheck.so cracklib
45 password required pam_unix2.so use_authtok
46 session required pam_unix2.so
47 +++ session required pam_winbind.so
51 Make sure that pam_winbind is one of the first modules in the session part. It may retrieve
52 kerberos tickets which are needed by other modules.
57 <title>OPTIONS</title>
60 pam_winbind supports several options which can either be set in
61 the PAM configuration files or in the pam_winbind configuration
63 <filename>/etc/security/pam_winbind.conf</filename>. Options
64 from the PAM configuration file take precedence to those from
65 the configuration file. See
66 <citerefentry><refentrytitle>pam_winbind.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>
73 <listitem><para>Gives debugging output to syslog.</para></listitem>
77 <term>debug_state</term>
78 <listitem><para>Gives detailed PAM state debugging output to syslog.</para></listitem>
82 <term>require_membership_of=[SID or NAME]</term>
84 If this option is set, pam_winbind will only succeed if the user is a member of the given SID or NAME. A SID
85 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
86 SID. That name must have the form: <parameter>MYDOMAIN\mygroup</parameter> or
87 <parameter>MYDOMAIN\myuser</parameter> (where '\' character corresponds to the value of
88 <parameter>winbind separator</parameter> parameter). It is also possible to use a UPN in the form
89 <parameter>user@REALM</parameter> or <parameter>group@REALM</parameter>. pam_winbind will, in that case, lookup
90 the SID internally. Note that NAME may not contain any spaces. It is thus recommended to only use SIDs. You can
91 verify the list of SIDs a user is a member of with <command>wbinfo --user-sids=SID</command>.
95 This option must only be specified on a auth
96 module declaration, as it only operates in conjunction
97 with password authentication.
103 <term>use_first_pass</term>
105 By default, pam_winbind tries to get the authentication token from a previous module. If no token is available
106 it asks the user for the old password. With this option, pam_winbind aborts with an error if no authentication
107 token from a previous module is available.
112 <term>try_first_pass</term>
114 Same as the use_first_pass option (previous item), except that if the primary password is not
115 valid, PAM will prompt for a password.
120 <term>use_authtok</term>
122 Set the new password to the one provided by the previously stacked password module. If this option is not set
123 pam_winbind will ask the user for the new password.
128 <term>try_authtok</term>
130 Same as the use_authtok option (previous item), except that if the new password is not
131 valid, PAM will prompt for a password.
136 <term>krb5_auth</term>
139 pam_winbind can authenticate using Kerberos when winbindd is
140 talking to an Active Directory domain controller. Kerberos
141 authentication must be enabled with this parameter. When
142 Kerberos authentication can not succeed (e.g. due to clock
143 skew), winbindd will fallback to samlogon authentication over
144 MSRPC. When this parameter is used in conjunction with
145 <parameter>winbind refresh tickets</parameter>, winbind will
146 keep your Ticket Granting Ticket (TGT) up-to-date by refreshing
147 it whenever necessary.
153 <term>krb5_ccache_type=[type]</term>
156 When pam_winbind is configured to try kerberos authentication
157 by enabling the <parameter>krb5_auth</parameter> option, it can
158 store the retrieved Ticket Granting Ticket (TGT) in a
159 credential cache. The type of credential cache can be
160 controlled with this option. The supported values are:
161 <parameter>KCM</parameter> or <parameter>KEYRING</parameter>
162 (when supported by the system's Kerberos library and
164 <parameter>FILE</parameter> and <parameter>DIR</parameter>
165 (when the DIR type is supported by the system's Kerberos
166 library). In case of FILE a credential cache in the form of
167 /tmp/krb5cc_UID will be created - in case of DIR you NEED
168 to specify a directory which must exist, the UID directory
169 will be created in the specified directory.
170 In all cases UID is replaced with the numeric user id.
171 Check the details of the Kerberos implementation.</para>
173 <para>When using the KEYRING type, the supported mechanism is
174 <quote>KEYRING:persistent:UID</quote>, which uses the Linux
175 kernel keyring to store credentials on a per-UID basis.
176 KEYRING has limitations. For example, it is secure kernel memory,
177 so bulk storage of credentials is not possible.</para>
179 <para>When using the KCM type, the supported mechanism is
180 <quote>KCM:UID</quote>, which uses a Kerberos credential
181 manager to store credentials on a per-UID basis similar to
182 KEYRING. This is the recommended choice on latest Linux
183 distributions that offer a Kerberos Credential Manager. If not,
184 we suggest to use KEYRING, as those are the most secure and
185 predictable method.</para>
187 <para>It is also possible to define custom filepaths and use the "%u"
188 pattern in order to substitute the numeric user id.
193 <term>krb5_ccache_type = DIR:/run/user/%u/krb5cc</term>
194 <listitem><para>This will create a credential cache file in the specified directory.</para></listitem>
197 <term>krb5_ccache_type = FILE:/tmp/krb5cc_%u</term>
198 <listitem><para>This will create a credential cache file.</para></listitem>
202 <para>Leave empty to just do kerberos authentication without
203 having a ticket cache after the logon has succeeded.
204 This setting is empty by default.</para>
209 <term>cached_login</term>
211 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.
218 Do not emit any messages.
223 <term>mkhomedir</term>
225 Create homedirectory for a user on-the-fly, option is valid in
231 <term>warn_pwd_expire</term>
233 Defines number of days before pam_winbind starts to warn about passwords that are
234 going to expire. Defaults to 14 days.
245 <title>PAM DATA EXPORTS</title>
247 <para>This section describes the data exported in the PAM stack which could be used in other PAM modules.</para>
250 <term>PAM_WINBIND_HOMEDIR</term>
253 This is the Windows Home Directory set in the profile tab in the user settings
254 on the Active Directory Server. This could be a local path or a directory on a
255 share mapped to a drive.
260 <term>PAM_WINBIND_LOGONSCRIPT</term>
263 The path to the logon script which should be executed if a user logs in. This is
264 normally a relative path to the script stored on the server.
269 <term>PAM_WINBIND_LOGONSERVER</term>
272 This exports the Active Directory server we are authenticating against. This can be
273 used as a variable later.
278 <term>PAM_WINBIND_PROFILEPATH</term>
281 This is the profile path set in the profile tab in the user settings. Normally
282 the home directory is synced with this directory on a share.
289 <title>SEE ALSO</title>
291 <refentrytitle>pam_winbind.conf</refentrytitle>
292 <manvolnum>5</manvolnum></citerefentry>, <citerefentry>
293 <refentrytitle>wbinfo</refentrytitle>
294 <manvolnum>1</manvolnum></citerefentry>, <citerefentry>
295 <refentrytitle>winbindd</refentrytitle>
296 <manvolnum>8</manvolnum></citerefentry>, <citerefentry>
297 <refentrytitle>smb.conf</refentrytitle>
298 <manvolnum>5</manvolnum></citerefentry></para>
302 <title>VERSION</title>
304 <para>This man page is part of version &doc.version; of Samba.</para>
308 <title>AUTHOR</title>
311 The original Samba software and related utilities were created by Andrew Tridgell. Samba is now developed by
312 the Samba Team as an Open Source project similar to the way the Linux kernel is developed.
315 <para>This manpage was written by Jelmer Vernooij and Guenther Deschner.</para>