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download PDF document: pam_winbind.8.pdf

PAM_WINBIND(8) 8 PAM_WINBIND(8)
NAME pam_winbind - PAM module for Winbind
DESCRIPTION This tool is part of the samba(7) suite.
pam_winbind is a PAM module that can authenticate users against the local domain by talking to the Winbind daemon.
SYNOPSIS Edit the PAM system config /etc/pam.d/service and modify it as the following example shows:
... 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 ...

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.
OPTIONS pam_winbind supports several options which can either be set in the PAM configuration files or in the pam_winbind configuration file situated at /etc/security/pam_winbind.conf. Options from the PAM configuration file take precedence to those from the configuration file. See pam_winbind.conf(5) for further details.
debug Gives debugging output to syslog.
debug_state Gives detailed PAM state debugging output to syslog.
require_membership_of=[SID or NAME] 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: MYDOMAIN\mygroup or MYDOMAIN\myuser (where '\' character corresponds to the value of winbind separator parameter). It is also possible to use a UPN in the form user@REALM or group@REALM. 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 wbinfo --user-sids=SID.
error if no authentication token from a previous module is available.
try_first_pass Same as the use_first_pass option (previous item), except that if the primary password is not valid, PAM will prompt for a password.
use_authtok 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.
try_authtok Same as the use_authtok option (previous item), except that if the new password is not valid, PAM will prompt for a password.
krb5_auth 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 winbind refresh tickets, winbind will keep your Ticket Granting Ticket (TGT) up-to-date by refreshing it whenever necessary.
krb5_ccache_type=[type] When pam_winbind is configured to try kerberos authentication by enabling the krb5_auth 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: KCM or KEYRING (when supported by the system's Kerberos library and operating system), FILE and DIR (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. UID is replaced with the numeric user id. The UID directory is being created. The path up to the directory should already exist. Check the details of the Kerberos implmentation.
When using the KEYRING type, the supported mechanism is "KEYRING:persistent:UID", which uses the Linux kernel keyring to store credentials on a per-UID basis. The KEYRING has its limitations. As it is secure kernel memory, for example bulk sorage of credentils is for not possible.
When using th KCM type, the supported mechanism is "KCM:UID", which uses a Kerberos credential manaager to store credentials on a per-UID basis similar to KEYRING. This is the recommended choice on latest Linux distributions, offering a Kerberos Credential Manager. If not we suggest to use KEYRING as those are the most secure and predictable method.
It is also possible to define custom filepaths and use the "%u" pattern in order to substitute the numeric user id. Examples:
krb5_ccache_type = DIR:/run/user/%u/krb5cc This will create a credential cache file in the specified directory.
cached_login Winbind allows one to logon using cached credentials when winbind offline logon is enabled. To use this feature from the PAM module this option must be set.
silent Do not emit any messages.
mkhomedir Create homedirectory for a user on-the-fly, option is valid in PAM session block.
warn_pwd_expire Defines number of days before pam_winbind starts to warn about passwords that are going to expire. Defaults to 14 days.
PAM DATA EXPORTS This section describes the data exported in the PAM stack which could be used in other PAM modules.
PAM_WINBIND_HOMEDIR 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.
PAM_WINBIND_LOGONSCRIPT 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.
PAM_WINBIND_LOGONSERVER This exports the Active Directory server we are authenticating against. This can be used as a variable later.
PAM_WINBIND_PROFILEPATH 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.
SEE ALSO pam_winbind.conf(5), wbinfo(1), winbindd(8), smb.conf(5)
VERSION This man page is part of version 4.13.17 of Samba.
AUTHOR 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.
This manpage was written by Jelmer Vernooij and Guenther Deschner.
Samba 4.13.17 01/31/2022 PAM_WINBIND(8)