2 * Copyright Alexander O. Yuriev, 1996. All rights reserved.
3 * NIS+ support by Thorsten Kukuk <kukuk@weber.uni-paderborn.de>
4 * Copyright Jan Rêkorajski, 1999. All rights reserved.
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, and the entire permission notice in its entirety,
11 * including the disclaimer of warranties.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. The name of the author may not be used to endorse or promote
16 * products derived from this software without specific prior
19 * ALTERNATIVELY, this product may be distributed under the terms of
20 * the GNU Public License, in which case the provisions of the GPL are
21 * required INSTEAD OF the above restrictions. (This clause is
22 * necessary due to a potential bad interaction between the GPL and
23 * the restrictions contained in a BSD-style copyright.)
25 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
26 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
27 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
28 * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
29 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
30 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
31 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
33 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
34 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
35 * OF THE POSSIBILITY OF SUCH DAMAGE.
47 #include <sys/types.h>
51 /* indicate the following groups are defined */
55 #define _PAM_EXTERN_FUNCTIONS
56 #include <security/_pam_macros.h>
57 #include <security/pam_modules.h>
58 #include <security/pam_ext.h>
63 * PAM framework looks for these entry-points to pass control to the
64 * authentication module.
69 * pam_sm_authenticate() performs UNIX/shadow authentication
71 * First, if shadow support is available, attempt to perform
72 * authentication using shadow passwords. If shadow is not
73 * available, or user does not have a shadow password, fallback
74 * onto a normal UNIX authentication
77 #define _UNIX_AUTHTOK "-UN*X-PASS"
82 D(("recording return code for next time [%d]", \
85 pam_set_data(pamh, "unix_setcred_return", \
86 (void *) ret_data, setcred_free); \
88 D(("done. [%s]", pam_strerror(pamh, retval))); \
94 setcred_free (pam_handle_t *pamh UNUSED, void *ptr, int err UNUSED)
101 pam_sm_authenticate(pam_handle_t *pamh, int flags, int argc, const char **argv)
104 int retval, *ret_data = NULL;
110 ctrl = _set_ctrl(pamh, flags, NULL, NULL, NULL, argc, argv);
112 /* Get a few bytes so we can pass our return value to
113 pam_sm_setcred() and pam_sm_acct_mgmt(). */
114 ret_data = malloc(sizeof(int));
116 /* get the user'name' */
118 retval = pam_get_user(pamh, &name, NULL);
119 if (retval == PAM_SUCCESS) {
121 * Various libraries at various times have had bugs related to
122 * '+' or '-' as the first character of a user name. Don't
123 * allow this characters here.
125 if (name == NULL || name[0] == '-' || name[0] == '+') {
126 pam_syslog(pamh, LOG_ERR, "bad username [%s]", name);
127 retval = PAM_USER_UNKNOWN;
130 if (on(UNIX_DEBUG, ctrl))
131 D(("username [%s] obtained", name));
133 D(("trouble reading username"));
134 if (retval == PAM_CONV_AGAIN) {
135 D(("pam_get_user/conv() function is not ready yet"));
136 /* it is safe to resume this function so we translate this
137 * retval to the value that indicates we're happy to resume.
139 retval = PAM_INCOMPLETE;
144 /* if this user does not have a password... */
146 if (_unix_blankpasswd(pamh, ctrl, name)) {
147 D(("user '%s' has blank passwd", name));
149 retval = PAM_SUCCESS;
152 /* get this user's authentication token */
154 retval = pam_get_authtok(pamh, PAM_AUTHTOK, &p , NULL);
155 if (retval != PAM_SUCCESS) {
156 if (retval != PAM_CONV_AGAIN) {
157 pam_syslog(pamh, LOG_CRIT,
158 "auth could not identify password for [%s]", name);
160 D(("conversation function is not ready yet"));
162 * it is safe to resume this function so we translate this
163 * retval to the value that indicates we're happy to resume.
165 retval = PAM_INCOMPLETE;
170 D(("user=%s, password=[%s]", name, p));
172 /* verify the password of this user */
173 retval = _unix_verify_password(pamh, name, p, ctrl);
181 * The only thing _pam_set_credentials_unix() does is initialization of
184 * Well, everybody but me on linux-pam is convinced that it should not
185 * initialize group IDs, so I am not doing it but don't say that I haven't
190 pam_sm_setcred (pam_handle_t *pamh, int flags,
191 int argc, const char **argv)
194 const void *pretval = NULL;
199 ctrl = _set_ctrl(pamh, flags, NULL, NULL, NULL, argc, argv);
201 retval = PAM_SUCCESS;
203 D(("recovering return code from auth call"));
204 /* We will only find something here if UNIX_LIKE_AUTH is set --
205 don't worry about an explicit check of argv. */
206 if (on(UNIX_LIKE_AUTH, ctrl)
207 && pam_get_data(pamh, "unix_setcred_return", &pretval) == PAM_SUCCESS
209 retval = *(const int *)pretval;
210 pam_set_data(pamh, "unix_setcred_return", NULL, NULL);
211 D(("recovered data indicates that old retval was %d", retval));