NetBSD/dist/openpam/lib/openpam_restore_cred.c

96 lines
2.9 KiB
C

/*-
* Copyright (c) 2002-2003 Networks Associates Technology, Inc.
* Copyright (c) 2004-2007 Dag-Erling Smørgrav
* All rights reserved.
*
* This software was developed for the FreeBSD Project by ThinkSec AS and
* Network Associates Laboratories, 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: openpam_restore_cred.c,v 1.5 2008/01/27 01:22:59 christos Exp $
*/
#include <sys/param.h>
#include <grp.h>
#include <limits.h>
#include <pwd.h>
#include <stdlib.h>
#include <unistd.h>
#include <security/pam_appl.h>
#include "openpam_impl.h"
/*
* OpenPAM extension
*
* Restore credentials
*/
int
openpam_restore_cred(pam_handle_t *pamh)
{
const struct pam_saved_cred *scred;
const void *scredp;
int r;
ENTER();
r = pam_get_data(pamh, PAM_SAVED_CRED, &scredp);
if (r != PAM_SUCCESS)
RETURNC(r);
if (scredp == NULL)
RETURNC(PAM_SYSTEM_ERR);
scred = scredp;
if (scred->euid != geteuid()) {
if (seteuid(scred->euid) < 0 ||
setgroups(scred->ngroups, scred->groups) < 0 ||
setegid(scred->egid) < 0)
RETURNC(PAM_SYSTEM_ERR);
}
pam_set_data(pamh, PAM_SAVED_CRED, NULL, NULL);
RETURNC(PAM_SUCCESS);
/*NOTREACHED*/
}
/*
* Error codes:
*
* =pam_get_data
* PAM_SYSTEM_ERR
*/
/**
* The =openpam_restore_cred function restores the credentials saved by
* =openpam_borrow_cred.
*
* >setegid 2
* >seteuid 2
* >setgroups 2
*/