2 * Copyright (c) 2003 Networks Associates Technology, Inc.
5 * Portions of this software were developed for the FreeBSD Project by
6 * ThinkSec AS and NAI Labs, the Security Research Division of Network
7 * 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
35 #include <sys/cdefs.h>
36 __FBSDID("$FreeBSD$");
42 #include <security/pam_appl.h>
43 #include <security/pam_modules.h>
44 #include <security/openpam.h>
46 #define DEFAULT_GUESTS "guest"
49 lookup(const char *str, const char *list)
55 while (*list != '\0') {
58 if ((next = strchr(list, ',')) == NULL)
59 next = strchr(list, '\0');
60 if (next - list == (ptrdiff_t)len &&
61 strncmp(list, str, len) == 0)
69 pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
70 int argc __unused, const char *argv[] __unused)
72 const char *authtok, *guests, *user;
75 /* get target account */
76 if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || user == NULL)
77 return (PAM_AUTH_ERR);
79 /* get list of guest logins */
80 if ((guests = openpam_get_option(pamh, "guests")) == NULL)
81 guests = DEFAULT_GUESTS;
83 /* check if the target account is on the list */
84 is_guest = lookup(user, guests);
87 if (!openpam_get_option(pamh, "nopass")) {
88 err = pam_get_authtok(pamh, PAM_AUTHTOK, &authtok, NULL);
89 if (err != PAM_SUCCESS)
91 if (openpam_get_option(pamh, "pass_is_user") &&
92 strcmp(user, authtok) != 0)
93 return (PAM_AUTH_ERR);
94 if (openpam_get_option(pamh, "pass_as_ruser"))
95 pam_set_item(pamh, PAM_RUSER, authtok);
100 pam_setenv(pamh, "GUEST", user, 1);
101 return (PAM_SUCCESS);
103 return (PAM_AUTH_ERR);
107 pam_sm_setcred(pam_handle_t * pamh __unused, int flags __unused,
108 int argc __unused, const char *argv[] __unused)
111 return (PAM_SUCCESS);
114 PAM_MODULE_ENTRY("pam_guest");