pam_unix.c revision 115619 
1/*-
2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
3 * All rights reserved.
4 *
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.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
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
20 *    permission.
21 *
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
32 * SUCH DAMAGE.
33 *
34 * $P4: //depot/projects/openpam/modules/pam_unix/pam_unix.c#5 $
35 */
36
37#include <sys/param.h>
38
39#include <pwd.h>
40#include <stdlib.h>
41#include <stdio.h>
42#include <string.h>
43#include <unistd.h>
44
45#ifdef __GLIBC__
46#include <crypt.h>
47#endif
48
49#include <security/pam_modules.h>
50#include <security/pam_appl.h>
51
52#ifndef _OPENPAM
53static char password_prompt[] = "Password:";
54#endif
55
56#ifndef PAM_EXTERN
57#define PAM_EXTERN
58#endif
59
60PAM_EXTERN int
61pam_sm_authenticate(pam_handle_t *pamh, int flags,
62	int argc, const char *argv[])
63{
64#ifndef _OPENPAM
65	struct pam_conv *conv;
66	struct pam_message msg;
67	const struct pam_message *msgp;
68	struct pam_response *resp;
69#endif
70	struct passwd *pwd;
71	const char *user;
72	char *crypt_password, *password;
73	int pam_err, retry;
74
75	/* identify user */
76	if ((pam_err = pam_get_user(pamh, &user, NULL)) != PAM_SUCCESS)
77		return (pam_err);
78	if ((pwd = getpwnam(user)) == NULL)
79		return (PAM_USER_UNKNOWN);
80
81	/* get password */
82#ifndef _OPENPAM
83	pam_err = pam_get_item(pamh, PAM_CONV, (const void **)&conv);
84	if (pam_err != PAM_SUCCESS)
85		return (PAM_SYSTEM_ERR);
86	msg.msg_style = PAM_PROMPT_ECHO_OFF;
87	msg.msg = password_prompt;
88	msgp = &msg;
89#endif
90	for (retry = 0; retry < 3; ++retry) {
91#ifdef _OPENPAM
92		pam_err = pam_get_authtok(pamh, PAM_AUTHTOK,
93		    (const char **)&password, NULL);
94#else
95		resp = NULL;
96		pam_err = (*conv->conv)(1, &msgp, &resp, conv->appdata_ptr);
97		if (resp != NULL) {
98			if (pam_err == PAM_SUCCESS)
99				password = resp->resp;
100			else
101				free(resp->resp);
102			free(resp);
103		}
104#endif
105		if (pam_err == PAM_SUCCESS)
106			break;
107	}
108	if (pam_err == PAM_CONV_ERR)
109		return (pam_err);
110	if (pam_err != PAM_SUCCESS)
111		return (PAM_AUTH_ERR);
112
113	/* compare passwords */
114	if ((!pwd->pw_passwd[0] && (flags & PAM_DISALLOW_NULL_AUTHTOK)) ||
115	    (crypt_password = crypt(password, pwd->pw_passwd)) == NULL ||
116	    strcmp(crypt_password, pwd->pw_passwd) != 0)
117		pam_err = PAM_AUTH_ERR;
118	else
119		pam_err = PAM_SUCCESS;
120#ifndef _OPENPAM
121	free(password);
122#endif
123	return (pam_err);
124}
125
126PAM_EXTERN int
127pam_sm_setcred(pam_handle_t *pamh, int flags,
128	int argc, const char *argv[])
129{
130
131	return (PAM_SUCCESS);
132}
133
134PAM_EXTERN int
135pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
136	int argc, const char *argv[])
137{
138
139	return (PAM_SUCCESS);
140}
141
142PAM_EXTERN int
143pam_sm_open_session(pam_handle_t *pamh, int flags,
144	int argc, const char *argv[])
145{
146
147	return (PAM_SUCCESS);
148}
149
150PAM_EXTERN int
151pam_sm_close_session(pam_handle_t *pamh, int flags,
152	int argc, const char *argv[])
153{
154
155	return (PAM_SUCCESS);
156}
157
158PAM_EXTERN int
159pam_sm_chauthtok(pam_handle_t *pamh, int flags,
160	int argc, const char *argv[])
161{
162
163	return (PAM_SERVICE_ERR);
164}
165
166#ifdef PAM_MODULE_ENTRY
167PAM_MODULE_ENTRY("pam_unix");
168#endif
169