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 * $OpenPAM: openpam_restore_cred.c 938 2017-04-30 21:34:42Z des $
36 */
37
38 #ifdef HAVE_CONFIG_H
39 # include "config.h"
40 #endif
41
42 #include <sys/param.h>
43
44 #include <grp.h>
45 #include <limits.h>
46 #include <pwd.h>
47 #include <stdlib.h>
48 #include <unistd.h>
49
50 #include <security/pam_appl.h>
51
52 #include "openpam_impl.h"
53 #include "openpam_cred.h"
54
55 /*
56 * OpenPAM extension
57 *
58 * Restore credentials
59 */
60
61 int
openpam_restore_cred(pam_handle_t * pamh)62 openpam_restore_cred(pam_handle_t *pamh)
63 {
64 const struct pam_saved_cred *scred;
65 const void *scredp;
66 int r;
67
68 ENTER();
69 r = pam_get_data(pamh, PAM_SAVED_CRED, &scredp);
70 if (r != PAM_SUCCESS)
71 RETURNC(r);
72 if (scredp == NULL)
73 RETURNC(PAM_SYSTEM_ERR);
74 scred = scredp;
75 if (scred->euid != geteuid()) {
76 if (seteuid(scred->euid) < 0 ||
77 setgroups(scred->ngroups, scred->groups) < 0 ||
78 setegid(scred->egid) < 0)
79 RETURNC(PAM_SYSTEM_ERR);
80 }
81 pam_set_data(pamh, PAM_SAVED_CRED, NULL, NULL);
82 RETURNC(PAM_SUCCESS);
83 }
84
85 /*
86 * Error codes:
87 *
88 * =pam_get_data
89 * PAM_SYSTEM_ERR
90 */
91
92 /**
93 * The =openpam_restore_cred function restores the credentials saved by
94 * =openpam_borrow_cred.
95 *
96 * >setegid 2
97 * >seteuid 2
98 * >setgroups 2
99 */
100