2 * Copyright (c) 2002 Networks Associates Technology, Inc.
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.
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
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
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
34 * $P4: //depot/projects/openpam/lib/openpam_borrow_cred.c#2 $
35 * $FreeBSD: src/lib/libpam/libpam/openpam_borrow_cred.c,v 1.1.2.3 2002/07/03 21:45:44 des Exp $
36 * $DragonFly: src/lib/libpam/libpam/Attic/openpam_borrow_cred.c,v 1.2 2003/06/17 04:26:50 dillon Exp $
39 #include <sys/param.h>
45 #include <security/pam_appl.h>
47 #include <security/pam_mod_misc.h>
50 openpam_free_data(pam_handle_t *pamh, void *data, int status)
52 /* silence compiler warnings */
61 * Temporarily borrow user credentials
65 openpam_borrow_cred(pam_handle_t *pamh,
66 const struct passwd *pwd)
68 struct pam_saved_cred *scred;
72 return (PAM_PERM_DENIED);
73 scred = calloc(1, sizeof *scred);
76 scred->euid = geteuid();
77 scred->egid = getegid();
78 r = getgroups(NGROUPS_MAX, scred->groups);
81 return (PAM_SYSTEM_ERR);
84 r = pam_set_data(pamh, PAM_SAVED_CRED, scred, &openpam_free_data);
85 if (r != PAM_SUCCESS) {
89 if (initgroups(pwd->pw_name, pwd->pw_gid) == -1 ||
90 setegid(pwd->pw_gid) == -1 || seteuid(pwd->pw_uid) == -1) {
91 openpam_restore_cred(pamh);
92 return (PAM_SYSTEM_ERR);
107 * The =openpam_borrow_cred function saves the current credentials and
108 * switches to those of the user specified by its =pwd argument. The
109 * affected credentials are the effective UID, the effective GID, and the
110 * group access list. The original credentials can be restored using
111 * =openpam_restore_cred.