1 /*-
2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
3 * Copyright (c) 2004-2011 Dag-Erling Smørgrav
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
59 int
openpam_restore_cred(pam_handle_t * pamh)60 openpam_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