pam_unix.c revision 294192 
1/*-
2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
3 * Copyright (c) 2004-2011 Dag-Erling Sm��rgrav
4 * All rights reserved.
5 *
6 * This software was developed for the FreeBSD Project by ThinkSec AS and
7 * Network Associates Laboratories, the Security Research Division of
8 * Network Associates, Inc.  under DARPA/SPAWAR contract N66001-01-C-8035
9 * ("CBOSS"), as part of the DARPA CHATS research program.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 * 1. Redistributions of source code must retain the above copyright
15 *    notice, this list of conditions and the following disclaimer.
16 * 2. Redistributions in binary form must reproduce the above copyright
17 *    notice, this list of conditions and the following disclaimer in the
18 *    documentation and/or other materials provided with the distribution.
19 * 3. The name of the author may not be used to endorse or promote
20 *    products derived from this software without specific prior written
21 *    permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 *
35 * $Id: pam_unix.c 648 2013-03-05 17:54:27Z des $
36 */
37
38#ifdef HAVE_CONFIG_H
39# include "config.h"
40#endif
41
42#include <sys/param.h>
43
44#include <pwd.h>
45#include <stdlib.h>
46#include <stdio.h>
47#include <string.h>
48#include <unistd.h>
49
50#ifdef HAVE_CRYPT_H
51# include <crypt.h>
52#endif
53
54#include <security/pam_modules.h>
55#include <security/pam_appl.h>
56
57#ifndef OPENPAM
58static char password_prompt[] = "Password:";
59#endif
60
61#ifndef PAM_EXTERN
62#define PAM_EXTERN
63#endif
64
65PAM_EXTERN int
66pam_sm_authenticate(pam_handle_t *pamh, int flags,
67	int argc, const char *argv[])
68{
69#ifndef OPENPAM
70	struct pam_conv *conv;
71	struct pam_message msg;
72	const struct pam_message *msgp;
73	struct pam_response *resp;
74#endif
75	struct passwd *pwd;
76	const char *user;
77	const char *crypt_password, *password;
78	int pam_err, retry;
79
80	(void)argc;
81	(void)argv;
82
83	/* identify user */
84	if ((pam_err = pam_get_user(pamh, &user, NULL)) != PAM_SUCCESS)
85		return (pam_err);
86	if ((pwd = getpwnam(user)) == NULL)
87		return (PAM_USER_UNKNOWN);
88
89	/* get password */
90#ifndef OPENPAM
91	pam_err = pam_get_item(pamh, PAM_CONV, (const void **)&conv);
92	if (pam_err != PAM_SUCCESS)
93		return (PAM_SYSTEM_ERR);
94	msg.msg_style = PAM_PROMPT_ECHO_OFF;
95	msg.msg = password_prompt;
96	msgp = &msg;
97#endif
98	for (retry = 0; retry < 3; ++retry) {
99#ifdef OPENPAM
100		pam_err = pam_get_authtok(pamh, PAM_AUTHTOK,
101		    &password, NULL);
102#else
103		resp = NULL;
104		pam_err = (*conv->conv)(1, &msgp, &resp, conv->appdata_ptr);
105		if (resp != NULL) {
106			if (pam_err == PAM_SUCCESS)
107				password = resp->resp;
108			else
109				free(resp->resp);
110			free(resp);
111		}
112#endif
113		if (pam_err == PAM_SUCCESS)
114			break;
115	}
116	if (pam_err == PAM_CONV_ERR)
117		return (pam_err);
118	if (pam_err != PAM_SUCCESS)
119		return (PAM_AUTH_ERR);
120
121	/* compare passwords */
122	if ((!pwd->pw_passwd[0] && (flags & PAM_DISALLOW_NULL_AUTHTOK)) ||
123	    (crypt_password = crypt(password, pwd->pw_passwd)) == NULL ||
124	    strcmp(crypt_password, pwd->pw_passwd) != 0)
125		pam_err = PAM_AUTH_ERR;
126	else
127		pam_err = PAM_SUCCESS;
128#ifndef OPENPAM
129	free(password);
130#endif
131	return (pam_err);
132}
133
134PAM_EXTERN int
135pam_sm_setcred(pam_handle_t *pamh, int flags,
136	int argc, const char *argv[])
137{
138
139	(void)pamh;
140	(void)flags;
141	(void)argc;
142	(void)argv;
143	return (PAM_SUCCESS);
144}
145
146PAM_EXTERN int
147pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
148	int argc, const char *argv[])
149{
150
151	(void)pamh;
152	(void)flags;
153	(void)argc;
154	(void)argv;
155	return (PAM_SUCCESS);
156}
157
158PAM_EXTERN int
159pam_sm_open_session(pam_handle_t *pamh, int flags,
160	int argc, const char *argv[])
161{
162
163	(void)pamh;
164	(void)flags;
165	(void)argc;
166	(void)argv;
167	return (PAM_SUCCESS);
168}
169
170PAM_EXTERN int
171pam_sm_close_session(pam_handle_t *pamh, int flags,
172	int argc, const char *argv[])
173{
174
175	(void)pamh;
176	(void)flags;
177	(void)argc;
178	(void)argv;
179	return (PAM_SUCCESS);
180}
181
182PAM_EXTERN int
183pam_sm_chauthtok(pam_handle_t *pamh, int flags,
184	int argc, const char *argv[])
185{
186
187	(void)pamh;
188	(void)flags;
189	(void)argc;
190	(void)argv;
191	return (PAM_SERVICE_ERR);
192}
193
194#ifdef PAM_MODULE_ENTRY
195PAM_MODULE_ENTRY("pam_unix");
196#endif
197