202 lines
6.0 KiB
Groff
202 lines
6.0 KiB
Groff
.\" Copyright (c) 2001 Mark R V Murray
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.\" All rights reserved.
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.\" Copyright (c) 2001 Networks Associates Technology, Inc.
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.\" All rights reserved.
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.\"
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.\" This software was developed for the FreeBSD Project by ThinkSec AS and
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.\" NAI Labs, the Security Research Division of Network Associates, Inc.
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.\" under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
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.\" DARPA CHATS research program.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. The name of the author may not be used to endorse or promote
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.\" products derived from this software without specific prior written
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.\" permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" $FreeBSD$
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.\"
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.Dd June 20, 2009
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.Dt PAM_UNIX 8
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.Os
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.Sh NAME
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.Nm pam_unix
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.Nd UNIX PAM module
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.Sh SYNOPSIS
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.Op Ar service-name
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.Ar module-type
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.Ar control-flag
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.Pa pam_unix
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.Op Ar options
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.Sh DESCRIPTION
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The
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.Ux
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authentication service module for PAM,
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.Nm
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provides functionality for three PAM categories:
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authentication, account management, and password management.
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In terms of the
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.Ar module-type
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parameter, they are the
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.Dq Li auth ,
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.Dq Li account ,
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and
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.Dq Li password
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features.
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It also provides a null function for session management.
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.Ss Ux Ss Authentication Module
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The
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.Ux
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authentication component provides functions to verify the identity of
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a user
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.Pq Fn pam_sm_authenticate ,
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which obtains the relevant
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.Xr passwd 5
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entry.
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It prompts the user for a password and verifies that this is correct with
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.Xr crypt 3 .
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.Pp
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The following options may be passed to the authentication module:
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.Bl -tag -width ".Cm use_first_pass"
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.It Cm debug
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.Xr syslog 3
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debugging information at
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.Dv LOG_DEBUG
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level.
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.It Cm use_first_pass
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If the authentication module is not the first in the stack, and a
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previous module obtained the user's password, that password is used to
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authenticate the user.
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If this fails, the authentication module returns failure without
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prompting the user for a password.
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This option has no effect if the authentication module is the first in
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the stack, or if no previous modules obtained the user's password.
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.It Cm try_first_pass
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This option is similar to the
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.Cm use_first_pass
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option, except that if the previously obtained password fails, the
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user is prompted for another password.
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.It Cm auth_as_self
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This option will require the user to authenticate themselves as
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themselves, not as the account they are attempting to access.
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This is primarily for services like
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.Xr su 1 ,
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where the user's ability to retype their own password might be deemed
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sufficient.
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.It Cm nullok
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If the password database has no password for the entity being
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authenticated, then this option will forgo password prompting, and
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silently allow authentication to succeed.
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.Pp
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.Sy NOTE:
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If
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.Nm
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is invoked by a process that does not have the privileges required to
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access the password database (in most cases, this means root
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privileges), the
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.Cm nullok
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option may cause
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.Nm
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to allow any user to log in with any password.
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.It Cm local_pass
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Use only the local password database, even if NIS is in use.
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This will cause an authentication failure if the system is configured
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to only use NIS.
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.It Cm nis_pass
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Use only the NIS password database.
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This will cause an authentication failure if the system is not
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configured to use NIS.
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.El
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.Ss Ux Ss Account Management Module
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The
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.Ux
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account management component provides a function to perform account
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management,
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.Fn pam_sm_acct_mgmt .
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The function verifies that the authenticated user is allowed to log
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into the local user account by checking the following criteria:
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.Bl -dash -offset indent
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.It
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locked status of the account compatible with
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.Xr pw 8
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.Cm lock ;
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.It
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the password expiry date from
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.Xr passwd 5 ;
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.It
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.Xr login.conf 5
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restrictions on the remote host, login time, and tty.
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.El
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.Pp
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The following options may be passed to the management module:
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.Bl -tag -width ".Cm use_first_pass"
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.It Cm debug
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.Xr syslog 3
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debugging information at
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.Dv LOG_DEBUG
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level.
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.El
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.Ss Ux Ss Password Management Module
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The
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.Ux
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password management component provides a function to perform password
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management,
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.Fn pam_sm_chauthtok .
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The function changes
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the user's password.
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.Pp
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The following options may be passed to the password module:
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.Bl -tag -width ".Cm use_first_pass"
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.It Cm debug
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.Xr syslog 3
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debugging information at
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.Dv LOG_DEBUG
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level.
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.It Cm no_warn
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suppress warning messages to the user.
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These messages include reasons why the user's authentication attempt
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was declined.
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.It Cm local_pass
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forces the password module to change a local password in favour of a
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NIS one.
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.It Cm nis_pass
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forces the password module to change a NIS password in favour of a
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local one.
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.El
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.Sh FILES
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.Bl -tag -width ".Pa /etc/master.passwd" -compact
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.It Pa /etc/master.passwd
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default
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.Ux
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password database.
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.El
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.Sh SEE ALSO
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.Xr passwd 1 ,
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.Xr getlogin 2 ,
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.Xr crypt 3 ,
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.Xr getpwent 3 ,
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.Xr syslog 3 ,
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.Xr nsswitch.conf 5 ,
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.Xr passwd 5 ,
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.Xr pam 8 ,
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.Xr pw 8 ,
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.Xr yp 8
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