openpam_restore_cred.c revision 107937 
1/*-
2 * Copyright (c) 2002 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#3 $
35 */
36
37#include <sys/param.h>
38
39#include <pwd.h>
40#include <stdlib.h>
41#include <unistd.h>
42
43#include <security/pam_appl.h>
44
45#include "openpam_impl.h"
46
47/*
48 * OpenPAM extension
49 *
50 * Restore credentials
51 */
52
53int
54openpam_restore_cred(pam_handle_t *pamh)
55{
56	struct pam_saved_cred *scred;
57	int r;
58
59	ENTER();
60	r = pam_get_data(pamh, PAM_SAVED_CRED, (const void **)&scred);
61	if (r != PAM_SUCCESS)
62		RETURNC(r);
63	if (scred == NULL)
64		RETURNC(PAM_SYSTEM_ERR);
65	if (seteuid(scred->euid) == -1 ||
66	    setgroups(scred->ngroups, scred->groups) == -1 ||
67	    setegid(scred->egid) == -1)
68		RETURNC(PAM_SYSTEM_ERR);
69	pam_set_data(pamh, PAM_SAVED_CRED, NULL, NULL);
70	RETURNC(PAM_SUCCESS);
71}
72
73/*
74 * Error codes:
75 *
76 *	=pam_get_data
77 *	PAM_SYSTEM_ERR
78 */
79
80/**
81 * The =openpam_restore_cred function restores the credentials saved by
82 * =openpam_borrow_cred.
83 *
84 * >setegid
85 * >seteuid
86 * >setgroups
87 */
88