source: openpam/trunk/modules/pam_unix/pam_unix.c @ 155

Last change on this file since 155 was 155, checked in by Dag-Erling Smørgrav, 19 years ago

A working bare-bones pam_unix module (authentication only). Should
work with Linux-PAM, though I've only tested it with OpenPAM.

Sponsored by: DARPA, NAI Labs

File size: 4.3 KB
Line 
1/*-
2 * Copyright (c) 2002 Networks Associates Technology, Inc.
3 * All rights reserved.
4 *
5 * This software was developed for the FreeBSD Project by ThinkSec AS and
6 * NAI Labs, the Security Research Division of Network Associates, Inc.
7 * under DARPA/SPAWAR contract N66001-01-C-8035 ("CBOSS"), as part of the
8 * 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#1 $
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#include <security/pam_modules.h>
46
47#ifndef _OPENPAM
48static char password_prompt[] = "Password:";
49#endif
50
51#ifndef PAM_EXTERN
52#define PAM_EXTERN
53#endif
54
55PAM_EXTERN int
56pam_sm_authenticate(pam_handle_t *pamh, int flags,
57        int argc, const char *argv[])
58{
59#ifndef _OPENPAM
60        struct pam_conv *conv;
61        struct pam_message msg;
62        const struct pam_message *msgp;
63        struct pam_response *resp;
64#endif
65        struct passwd *pwd;
66        const char *user;
67        char *crypt_password, *password;
68        int pam_err, retry;
69
70        /* identify user */
71        if ((pam_err = pam_get_user(pamh, &user, NULL)) != PAM_SUCCESS)
72                return (pam_err);
73        if ((pwd = getpwnam(user)) == NULL)
74                return (PAM_USER_UNKNOWN);
75
76        /* get password */
77#ifndef _OPENPAM
78        pam_err = pam_get_item(pamh, PAM_CONV, (const void **)&conv);
79        if (pam_err != PAM_SUCCESS)
80                return (PAM_SYSTEM_ERR);
81        msg.msg_style = PAM_PROMPT_ECHO_OFF;
82        msg.msg = password_prompt;
83        msgp = &msg;
84#endif
85        for (retry = 0; retry < 3; ++retry) {
86#ifdef _OPENPAM
87                pam_err = pam_get_authtok(pamh, PAM_AUTHTOK,
88                    (const char **)&password, NULL);
89#else
90                resp = NULL;
91                pam_err = (*conv->conv)(1, &msgp, &resp, conv->appdata_ptr);
92                if (resp != NULL) {
93                        if (pam_err == PAM_SUCCESS)
94                                password = resp->resp;
95                        else
96                                free(resp->resp);
97                        free(resp);
98                }
99#endif
100                if (pam_err == PAM_SUCCESS)
101                        break;
102        }
103        if (pam_err == PAM_CONV_ERR)
104                return (pam_err);
105        if (pam_err != PAM_SUCCESS)
106                return (PAM_AUTH_ERR);
107
108        /* compare passwords */
109        if ((!pwd->pw_passwd[0] && (flags & PAM_DISALLOW_NULL_AUTHTOK)) ||
110            (crypt_password = crypt(password, pwd->pw_passwd)) == NULL ||
111            strcmp(crypt_password, pwd->pw_passwd) != 0)
112                pam_err = PAM_AUTH_ERR;
113        else
114                pam_err = PAM_SUCCESS;
115#ifndef _OPENPAM
116        free(password);
117#endif
118        return (pam_err);
119}
120
121PAM_EXTERN int
122pam_sm_setcred(pam_handle_t *pamh, int flags,
123        int argc, const char *argv[])
124{
125
126        return (PAM_SUCCESS);
127}
128
129PAM_EXTERN int
130pam_sm_acct_mgmt(pam_handle_t *pamh, int flags,
131        int argc, const char *argv[])
132{
133
134        return (PAM_SUCCESS);
135}
136
137PAM_EXTERN int
138pam_sm_open_session(pam_handle_t *pamh, int flags,
139        int argc, const char *argv[])
140{
141
142        return (PAM_SUCCESS);
143}
144
145PAM_EXTERN int
146pam_sm_close_session(pam_handle_t *pamh, int flags,
147        int argc, const char *argv[])
148{
149
150        return (PAM_SUCCESS);
151}
152
153PAM_EXTERN int
154pam_sm_chauthtok(pam_handle_t *pamh, int flags,
155        int argc, const char *argv[])
156{
157
158        return (PAM_SERVICE_ERR);
159}
160
161#ifdef PAM_MODULE_ENTRY
162PAM_MODULE_ENTRY("pam_unix");
163#endif
Note: See TracBrowser for help on using the repository browser.