openpam_restore_cred.c revision 141098 
1/*-
2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
3 * All rights reserved.
4 *
5 * This software was developed for the FreeBSD Project by ThinkSec AS and
6 * Network Associates Laboratories, the Security Research Division of
7 * Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
8 * ("CBOSS"), as part of the DARPA CHATS research program.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. The name of the author may not be used to endorse or promote
19 *    products derived from this software without specific prior written
20 *    permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 * $P4: //depot/projects/openpam/lib/openpam_restore_cred.c#11 $
35 */
36
37#include <sys/param.h>
38
39#include <grp.h>
40#include <limits.h>
41#include <pwd.h>
42#include <stdlib.h>
43#include <unistd.h>
44
45#include <security/pam_appl.h>
46
47#include "openpam_impl.h"
48
49/*
50 * OpenPAM extension
51 *
52 * Restore credentials
53 */
54
55int
56openpam_restore_cred(pam_handle_t *pamh)
57{
58	struct pam_saved_cred *scred;
59	void *scredp;
60	int r;
61
62	ENTER();
63	r = pam_get_data(pamh, PAM_SAVED_CRED, &scredp);
64	if (r != PAM_SUCCESS)
65		RETURNC(r);
66	if (scredp == NULL)
67		RETURNC(PAM_SYSTEM_ERR);
68	scred = scredp;
69	if (scred->euid != geteuid()) {
70		if (seteuid(scred->euid) < 0 ||
71		    setgroups(scred->ngroups, scred->groups) < 0 ||
72		    setegid(scred->egid) < 0)
73			RETURNC(PAM_SYSTEM_ERR);
74	}
75	pam_set_data(pamh, PAM_SAVED_CRED, NULL, NULL);
76	RETURNC(PAM_SUCCESS);
77}
78
79/*
80 * Error codes:
81 *
82 *	=pam_get_data
83 *	PAM_SYSTEM_ERR
84 */
85
86/**
87 * The =openpam_restore_cred function restores the credentials saved by
88 * =openpam_borrow_cred.
89 *
90 * >setegid 2
91 * >seteuid 2
92 * >setgroups 2
93 */
94