2002-05-28 20:52:31 +00:00
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.\" 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 May 15, 2002
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.Dt pam_ksu 8
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.Os
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.Sh NAME
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.Nm pam_ksu
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.Nd Kerberos 5 SU 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_ksu
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.Op Ar options
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.Sh DESCRIPTION
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The Kerberos 5 SU authentication service module for PAM,
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.Nm
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for only one PAM category: authentication.
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In terms of the
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.Ar module-type
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parameter, this is the
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.Dq Li auth
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feature.
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The module is specifically designed to be used with the
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.Xr su 1
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utility.
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.\" It also provides a null function for session management.
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.Ss Kerberos 5 SU Authentication Module
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The Kerberos 5 SU authentication component provides functions to verify
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the identity of a user
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.Pq Fn pam_sm_authenticate ,
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and determine whether or not the user is authorized to obtain the
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privileges of the target account.
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2002-05-30 14:32:48 +00:00
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If the target account is
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.Dq root ,
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then the Kerberos 5 principal used
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for authentication and authorization will be the
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.Dq root
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instance of
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the current user, e.g.\&
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.Dq Li user/root@REAL.M .
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2002-05-28 20:52:31 +00:00
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Otherwise, the principal will simply be the current user's default
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principal, e.g.\&
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.Dq Li user@REAL.M .
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.Pp
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The user is prompted for a password if necessary.
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Authorization is performed
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by comparing the Kerberos 5 principal with those listed in the
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.Pa .k5login
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file in the target account's home directory
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(e.g.\&
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.Pa /root/.k5login
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for root).
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2002-05-28 20:52:31 +00:00
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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
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is not the first in the stack,
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and a previous module
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obtained the user's password,
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that password is used
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to authenticate the user.
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If this fails,
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the authentication module returns failure
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without prompting the user for a password.
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This option has no effect
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if the authentication module
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is the first in the stack,
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or if no previous modules
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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,
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except that if the previously obtained password fails,
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the user is prompted for another password.
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.El
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.Sh SEE ALSO
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.Xr su 1 ,
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.Xr syslog 3 ,
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.Xr pam.conf 5 ,
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.Xr pam 8
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