source: openpam/trunk/lib/openpam_restore_cred.c @ 106

Last change on this file since 106 was 106, checked in by Dag-Erling Smørgrav, 19 years ago

Add openpam_{borrow,restore}_cred() (for temporarily switching to
user credentials) and openpam_free_data() (generic cleanup function
for pam_set_data() consumers)

Sponsored by: DARPA, NAI Labs

File size: 2.7 KB
Line 
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 * NAI Labs, the Security Research Division of Network Associates, Inc.
7 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
8 * 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#1 $
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        r = pam_get_data(pamh, PAM_SAVED_CRED, (const void **)&scred);
60        if (r != PAM_SUCCESS)
61                return (r);
62        if (scred == NULL)
63                return (PAM_SYSTEM_ERR);
64        if (seteuid(scred->euid) == -1 ||
65            setgroups(scred->ngroups, scred->groups) == -1 ||
66            setegid(scred->egid) == -1)
67                return (PAM_SYSTEM_ERR);
68        pam_set_data(pamh, PAM_SAVED_CRED, NULL, NULL);
69        return (PAM_SUCCESS);
70}
71
72/*
73 * Error codes:
74 *
75 *      =pam_get_data
76 *      PAM_SYSTEM_ERR
77 */
78
79/**
80 * The =openpam_restore_cred function restores the credentials saved by
81 * =openpam_borrow_cred.
82 *
83 * >setegid
84 * >seteuid
85 * >setgroups
86 */
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