1/*-
2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
3 * Copyright (c) 2004-2011 Dag-Erling Sm��rgrav
4 * All rights reserved.
5 *
6 * This software was developed for the FreeBSD Project by ThinkSec AS and
7 * Network Associates Laboratories, the Security Research Division of
8 * Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
9 * ("CBOSS"), as part of the DARPA CHATS research program.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote
20 *    products derived from this software without specific prior written
21 *    permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#ifdef HAVE_CONFIG_H
37# include "config.h"
38#endif
39
40#include <sys/param.h>
41
42#include <grp.h>
43#include <limits.h>
44#include <pwd.h>
45#include <stdlib.h>
46#include <unistd.h>
47
48#include <security/pam_appl.h>
49
50#include "openpam_impl.h"
51#include "openpam_cred.h"
52
53/*
54 * OpenPAM extension
55 *
56 * Restore credentials
57 */
58
59int
60openpam_restore_cred(pam_handle_t *pamh)
61{
62	const struct pam_saved_cred *scred;
63	const void *scredp;
64	int r;
65
66	ENTER();
67	r = pam_get_data(pamh, PAM_SAVED_CRED, &scredp);
68	if (r != PAM_SUCCESS)
69		RETURNC(r);
70	if (scredp == NULL)
71		RETURNC(PAM_SYSTEM_ERR);
72	scred = scredp;
73	if (scred->euid != geteuid()) {
74		if (seteuid(scred->euid) < 0 ||
75		    setgroups(scred->ngroups, scred->groups) < 0 ||
76		    setegid(scred->egid) < 0)
77			RETURNC(PAM_SYSTEM_ERR);
78	}
79	pam_set_data(pamh, PAM_SAVED_CRED, NULL, NULL);
80	RETURNC(PAM_SUCCESS);
81}
82
83/*
84 * Error codes:
85 *
86 *	=pam_get_data
87 *	PAM_SYSTEM_ERR
88 */
89
90/**
91 * The =openpam_restore_cred function restores the credentials saved by
92 * =openpam_borrow_cred.
93 *
94 * >setegid 2
95 * >seteuid 2
96 * >setgroups 2
97 */
98