2 * SPDX-License-Identifier: BSD-3-Clause
4 * Copyright (c) 2001 Mark R V Murray
6 * Copyright (c) 2001,2002 Networks Associates Technology, Inc.
9 * Portions of this software were developed for the FreeBSD Project by
10 * ThinkSec AS and NAI Labs, the Security Research Division of Network
11 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
12 * ("CBOSS"), as part of the DARPA CHATS research program.
14 * Redistribution and use in source and binary forms, with or without
15 * modification, are permitted provided that the following conditions
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 * 2. Redistributions in binary form must reproduce the above copyright
20 * notice, this list of conditions and the following disclaimer in the
21 * documentation and/or other materials provided with the distribution.
22 * 3. The name of the author may not be used to endorse or promote
23 * products derived from this software without specific prior written
26 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
27 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
28 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
29 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
30 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
31 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
32 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
33 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
34 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
35 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
39 #include <sys/cdefs.h>
40 __FBSDID("$FreeBSD$");
50 #include <security/pam_appl.h>
51 #include <security/pam_modules.h>
52 #include <security/pam_mod_misc.h>
54 #define OPT_ALLOW_ROOT "allow_root"
57 pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
58 int argc __unused, const char *argv[] __unused)
65 pam_err = pam_get_user(pamh, &luser, NULL);
66 if (pam_err != PAM_SUCCESS)
68 if (luser == NULL || (pwd = getpwnam(luser)) == NULL)
69 return (PAM_AUTH_ERR);
72 if (uid == 0 && !openpam_get_option(pamh, OPT_ALLOW_ROOT))
73 return (PAM_AUTH_ERR);
75 if (uid == (uid_t)pwd->pw_uid)
78 PAM_VERBOSE_ERROR("Refused; source and target users differ");
80 return (PAM_AUTH_ERR);
84 pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
85 int argc __unused, const char *argv[] __unused)
91 PAM_MODULE_ENTRY("pam_self");