03adba96a0
- Ignore the {try,use}_first_pass options by clearing PAM_AUTHTOK before
challenging the user. These options are meaningless for pam_opie(8)
since the user can't possibly know the right response before she sees
the challenge.
- Introduce the no_fake_prompts option. If this option is set, pam_opie(8)
will fail - rather than present a bogus challenge - if the target user
does not have an OPIE key. With this option, users who haven't set up
OPIE won't have to wonder what that "weird otp-md5 s**t" means :)
Reviewed by: ache, markm
Sponsored by: DARPA, NAI Labs
124 lines
3.9 KiB
Groff
124 lines
3.9 KiB
Groff
.\" Copyright (c) 2001 Mark R V Murray
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.\" All rights reserved.
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.\" Copyright (c) 2002 Networks Associates Technologies, Inc.
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.\" All rights reserved.
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.\"
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.\" Portions of this software were developed for the FreeBSD Project by
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.\" ThinkSec AS and NAI Labs, the Security Research Division of Network
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.\" Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
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.\" ("CBOSS"), as part of the 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 July 7, 2001
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.Dt PAM_OPIE 8
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.Os
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.Sh NAME
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.Nm pam_opie
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.Nd OPIE 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_opie
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.Op Ar options
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.Sh DESCRIPTION
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The OPIE authentication service module for PAM,
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.Nm
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provides functionality for only one PAM category:
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that of 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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It also provides a null function for session management.
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.Pp
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Note that this module does not enforce
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.Xr opieaccess 5
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checks.
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There is a separate module,
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.Xr pam_opieaccess 8 ,
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for this purpose.
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.Ss OPIE Authentication Module
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The OPIE authentication component
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provides functions to verify the identity of a user
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.Pq Fn pam_sm_authenticate ,
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which obtains the relevant
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.Xr opie 4
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credentials.
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It provides the user with an OPIE challenge,
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and verifies that this is correct with
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.Xr opiechallenge 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 auth_as_self"
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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 auth_as_self
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This option will require the user
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to authenticate themself as the user
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given by
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.Xr getlogin 2 ,
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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
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their own password
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might be deemed sufficient.
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.It Cm no_fake_prompts
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Do not generate fake challenges for users who do not have an OPIE key.
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Note that this can leak information to a hypothetical attacker about
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who uses OPIE and who doesn't, but it can be useful on systems where
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some users want to use OPIE but most don't.
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.El
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.Pp
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Note that
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.Nm
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ignores the standard options
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.Cm try_first_pass
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and
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.Cm use_first_pass ,
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since a challenge must be generated before the user can submit a valid
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response.
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.Sh FILES
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.Bl -tag -width ".Pa /etc/opiekeys" -compact
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.It Pa /etc/opiekeys
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default OPIE 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 opiechallenge 3 ,
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.Xr syslog 3 ,
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.Xr opie 4 ,
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.Xr pam.conf 5 ,
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.Xr pam 8
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