1/*	$NetBSD$	*/
2
3/*-
4 * Copyright (c) 2003 Networks Associates Technology, Inc.
5 * All rights reserved.
6 *
7 * Portions of this software were developed for the FreeBSD Project by
8 * ThinkSec AS and NAI Labs, the Security Research Division of Network
9 * Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
10 * ("CBOSS"), as part of the DARPA CHATS research program.
11 *
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
14 * are met:
15 * 1. Redistributions of source code must retain the above copyright
16 *    notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 *    notice, this list of conditions and the following disclaimer in the
19 *    documentation and/or other materials provided with the distribution.
20 * 3. The name of the author may not be used to endorse or promote
21 *    products derived from this software without specific prior written
22 *    permission.
23 *
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34 * SUCH DAMAGE.
35 */
36
37#include <sys/cdefs.h>
38#ifdef __FreeBSD__
39__FBSDID("$FreeBSD: src/lib/libpam/modules/pam_guest/pam_guest.c,v 1.1 2003/05/31 16:52:58 des Exp $");
40#else
41__RCSID("$NetBSD$");
42#endif
43
44#include <string.h>
45
46#define PAM_SM_AUTH
47
48#include <security/pam_appl.h>
49#include <security/pam_modules.h>
50#include <security/openpam.h>
51
52#define DEFAULT_GUESTS	"guest"
53
54static int
55lookup(const char *str, const char *list)
56{
57	const char *next;
58	size_t len;
59
60	len = strlen(str);
61	while (*list != '\0') {
62		while (*list == ',')
63			++list;
64		if ((next = strchr(list, ',')) == NULL)
65			next = strchr(list, '\0');
66		if (next - list == (ptrdiff_t)len &&
67		    strncmp(list, str, len) == 0)
68			return (1);
69		list = next;
70	}
71	return (0);
72}
73
74PAM_EXTERN int
75pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
76    int argc __unused, const char *argv[] __unused)
77{
78	const char *authtok, *guests, *user;
79	int err, is_guest;
80
81	/* get target account */
82	if (pam_get_user(pamh, &user, NULL) != PAM_SUCCESS || user == NULL)
83		return (PAM_AUTH_ERR);
84
85	/* get list of guest logins */
86	if ((guests = openpam_get_option(pamh, "guests")) == NULL)
87		guests = DEFAULT_GUESTS;
88
89	/* check if the target account is on the list */
90	is_guest = lookup(user, guests);
91
92	/* check password */
93	if (!openpam_get_option(pamh, "nopass")) {
94		err = pam_get_authtok(pamh, PAM_AUTHTOK, &authtok, NULL);
95		if (err != PAM_SUCCESS)
96			return (err);
97		if (openpam_get_option(pamh, "pass_is_user") &&
98		    strcmp(user, authtok) != 0)
99			return (PAM_AUTH_ERR);
100		if (openpam_get_option(pamh, "pass_as_ruser"))
101			pam_set_item(pamh, PAM_RUSER, authtok);
102	}
103
104	/* done */
105	if (is_guest) {
106		pam_setenv(pamh, "GUEST", user, 1);
107		return (PAM_SUCCESS);
108	}
109	return (PAM_AUTH_ERR);
110}
111
112PAM_EXTERN int
113pam_sm_setcred(pam_handle_t * pamh __unused, int flags __unused,
114    int argc __unused, const char *argv[] __unused)
115{
116
117	return (PAM_SUCCESS);
118}
119
120PAM_MODULE_ENTRY("pam_guest");
121