source: openpam/trunk/modules/pam_unix/pam_unix.c

Last change on this file was 938, checked in by Dag-Erling Smørgrav, 3 years ago

Switch from $Id$ to $OpenPAM$.

  • Property svn:eol-style set to native
  • Property svn:keywords set to OpenPAM=%I
File size: 4.7 KB
Line 
1/*-
2 * Copyright (c) 2002-2003 Networks Associates Technology, Inc.
3 * Copyright (c) 2004-2015 Dag-Erling Smørgrav
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 * $OpenPAM: pam_unix.c 938 2017-04-30 21:34:42Z 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
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