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.\" 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.
.\"
.\" 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.
.\" 3. The name of the author may not be used to endorse or promote
.\" products derived from this software without specific prior written
.\" permission.
.\"
.\" 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.
.\"
.\" $Id: pam_ssh.8,v 1.7 2008/05/12 18:57:12 rosenauer Exp $
.\"
.Dd November 26, 2001
.Dt PAM_SSH 8
.Os
.Sh NAME
.Nm pam_ssh
.Nd authentication and session management with SSH private keys
.Sh SYNOPSIS
.Op Ar service-name
.Ar module-type
.Ar control-flag
.Pa pam_ssh
.Op Ar options
.Sh DESCRIPTION
The
SSH
authentication service module for PAM,
.Nm
provides functionality for two PAM categories:
authentication
and session management.
In terms of the
.Ar module-type
parameter, they are the
.Dq Li auth
and
.Dq Li session
features.
It also provides null functions for the remaining categories.
.Ss SSH Authentication Module
The
SSH
authentication component
provides a function to verify the identity of a user
.Pq Fn pam_sm_authenticate ,
by prompting the user for a passphrase and verifying that it can
decrypt the target user's SSH key using that passphrase.
.Pp
The following options may be passed to the authentication module:
.Bl -tag -width ".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 keyfiles
Specify the comma-separated list of files in
.Pa $HOME/.ssh
to check for SSH keys.
The default is
.Dq id_dsa,id_rsa,identity .
.It Cm nullok
Allow empty passphrases.
.El
.Ss SSH Session Management Module
The
SSH
session management component
provides functions to initiate
.Pq Fn pam_sm_open_session
and terminate
.Pq Fn pam_sm_close_session
sessions.
The
.Fn pam_sm_open_session
function starts an SSH agent,
passing it any private keys it decrypted
during the authentication phase,
and sets the environment variables
the agent specifies.
The
.Fn pam_sm_close_session
function kills the previously started SSH agent
by sending it a
.Dv SIGTERM .
.Pp
The following options may be passed to the session management module:
.Bl -tag -width ".Cm use_first_pass"
.It Cm debug
.Xr syslog 3
debugging information at
.Dv LOG_DEBUG
level.
.El
.Sh FILES
.Bl -tag -width ".Pa $HOME/.ssh2/id_dsa_*" -compact
.It Pa $HOME/.ssh/identity
SSH1/OpenSSH RSA key
.It Pa $HOME/.ssh/id_dsa
OpenSSH DSA key
.It Pa $HOME/.ssh2/id_rsa_*
SSH2 RSA keys
.It Pa $HOME/.ssh2/id_dsa_*
SSH2 DSA keys
.El
.Sh SEE ALSO
.Xr ssh-agent 1 ,
.Xr syslog 3 ,
.Xr pam.conf 5 ,
.Xr pam 8
.Sh AUTHORS
.Pp
.An -nosplit
.An "Andrew J. Korty" Aq ajk@iu.edu
wrote
.Nm .
.An "Dag-Erling Smorgrav"
wrote the original OpenPAM support code.
.An "Mark R V Murray"
wrote the original version of this manual page.
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