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+.\" Copyright (c) 2001 Mark R V Murray
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd July 7, 2001
+.Dt PAM_UNIX 8
+.Os
+.Sh NAME
+.Nm pam_unix
+.Nd UNIX PAM module
+.Sh SYNOPSIS
+.Op Ar service-name
+.Ar module-type
+.Ar control-flag
+.Pa pam_unix
+.Op Ar options
+.Sh DESCRIPTION
+The
+.Ux
+authentication service module for PAM,
+.Nm
+provides functionality for two PAM categories:
+authentication
+and account management.
+In terms of the 
+.Ar module-type
+parameter, they are the
+.Dv auth
+and
+.Dv account
+features.
+It also provides a null function for session management.
+.Ss Ux Authentication Module
+The
+.Ux
+authentication component
+provides functions to verify the identity of a user
+.Pq Fn pam_sm_authenticate ,
+which obtains the relevant
+.Xr passwd 5
+entry.
+It prompts the user for a password
+and verifies that this is correct with
+.Xr crypt 3 .
+.Pp
+The following options may be passed to the authentication module:
+.Bl -tag -xwidth ".Cm use_first_pass"
+.It Cm debug
+.Xr syslog 3
+debugging information at
+.Dv LOG_DEBUG
+level.
+.It Cm use_first_pass
+If the authentication module
+is not the first in the stack,
+and a previous module
+obtained the user's password,
+that password is used
+to authenticate the user.
+If this fails,
+the authentication module returns failure
+without prompting the user for a password.
+This option has no effect
+if the authentication module
+is the first in the stack,
+or if no previous modules
+obtained the user's password.
+.It Cm try_first_pass
+This option is similar to the
+.Cm use_first_pass
+option,
+except that if the previously obtained password fails,
+the user is prompted for another password.
+.It Cm auth_as_self
+This option will require the user
+to authenticate themself as the user
+given by
+.Fn getuid 2 ,
+not as the account they are attempting to access.
+This is primarily for services like
+.Xr su 1 ,
+where the user's ability to retype
+their own password
+might be deemed sufficient.
+.It Cm nullok
+If the password database
+has no password
+for the entity being authenticated,
+then this option
+will forgo password prompting,
+and silently allow authentication to succeed.
+.El
+.Ss Ux Account Management Module
+The
+.Ux
+account management component
+provides a function to perform account management,
+.Fn pam_sm_acct_mgmt .
+The function verifies
+that the authenticated user
+is allowed to login to the local user account
+by checking the password expiry date.
+.Pp
+The following options may be passed to the management module:
+.Bl -tag -xwidth ".Cm use_first_pass"
+.It Cm debug
+.Xr syslog 3
+debugging information at
+.Dv LOG_DEBUG
+level.
+.El
+.Sh FILES
+.Bl -tag -xwidth ".Pa /etc/master.passwd" -compact
+.It Pa /etc/master.passwd
+default 
+.Ux
+password database.
+.El
+.Sh SEE ALSO
+.Xr passwd 1 ,
+.Xr getuid 2 ,
+.Xr crypt 3 ,
+.Xr passwd 5 ,
+.Xr syslog 3 ,
+.Xr pam.conf 5 ,
+.Xr pam 8