Copyright (c) 2001 Mark R V Murray
All rights reserved.
Copyright (c) 2001 Networks Associates Technology, Inc.
All rights reserved.
This software was developed for the FreeBSD Project by ThinkSec AS and
NAI Labs, the Security Research Division of Network Associates, Inc.
under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
DARPA CHATS research program.
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modification, are permitted provided that the following conditions
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$FreeBSD: src/lib/libpam/modules/pam_unix/pam_unix.8,v 1.11 2005/01/21 10:44:10 ru Exp $
.Dd February 26, 2005 .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
a pam_unix .Op Ar options .Sh DESCRIPTION The x authentication service module for PAM provides functionality for two PAM categories: authentication and account management. In terms of the .Ar module-type parameter, they are the .Dq Li auth and .Dq Li account features. It also provides a null function for session management. .Ss UNIX Authentication Module The x authentication component provides functions to verify the identity of a user
q 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 .
p
The following options may be passed to the authentication module:
l -tag -width ".Cm use_first_pass" t Cm debug .Xr syslog 3
debugging information at
.Dv LOG_DEBUG
level.
t 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.
t 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.
t Cm auth_as_self This option will require the user
to authenticate himself as the user
given by
.Xr getlogin 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.
t 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.
XXX This is not currently implemented. It's debatable whether or not
XXX it should be.
.It Cm passwd_db Ns = Ns Ar name
Use only the specified password database.
Valid password database names are:
.Bl -tag -width files
.It files
local password file
.It nis
NIS password database
.El
.Pp
If the user does not exist in the specified password database or if the
system is not configured to use the specified password database, an
authentication failure will occur.
.El
.Ss UNIX Account Management Module
The
x 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.
p The following options may be passed to the management module: l -tag -width ".Cm use_first_pass" t Cm debug .Xr syslog 3 debugging information at .Dv LOG_DEBUG level. .El .Ss UNIX Password Management Module The x password management component provides a function to perform account management, .Fn pam_sm_chauthtok . The function changes the user's password.
p The following options may be passed to the password module: l -tag -width ".Cm use_first_pass" t Cm debug .Xr syslog 3 debugging information at .Dv LOG_DEBUG level. t Cm no_warn suppress warning messages to the user. These messages include reasons why the user's authentication attempt was declined. t Cm passwd_db Ns = Ns Ar name Change the user's password only the specified password database. Valid password database names are: l -tag -width files t files local password file t nis NIS password database .El .El .Sh FILES l -tag -width ".Pa /etc/master.passwd" -compact t Pa /etc/master.passwd default x password database. .El .Sh SEE ALSO .Xr passwd 1 , .Xr getlogin 2 , .Xr crypt 3 , .Xr getpwent 3 , .Xr syslog 3 , .Xr nsswitch.conf 5 , .Xr passwd 5 , .Xr nis 8 , .Xr pam 8