2 * Copyright 1998 Juniper Networks, Inc.
4 * Copyright (c) 2001-2003 Networks Associates Technology, Inc.
7 * Portions of this software were developed for the FreeBSD Project by
8 * ThinkSec AS and NAI Labs, the Security Research Division of Network
9 * Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035
10 * ("CBOSS"), as part of the DARPA CHATS research program.
12 * Redistribution and use in source and binary forms, with or without
13 * modification, are permitted provided that the following conditions
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions and the following disclaimer.
17 * 2. Redistributions in binary form must reproduce the above copyright
18 * notice, this list of conditions and the following disclaimer in the
19 * documentation and/or other materials provided with the distribution.
20 * 3. The name of the author may not be used to endorse or promote
21 * products derived from this software without specific prior written
24 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
25 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
28 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
37 #include <sys/cdefs.h>
38 __FBSDID("$FreeBSD$");
40 #include <sys/param.h>
41 #include <sys/types.h>
42 #include <sys/socket.h>
53 #include <security/pam_appl.h>
54 #include <security/pam_modules.h>
55 #include <security/pam_mod_misc.h>
57 #define PAM_OPT_CONF "conf"
58 #define PAM_OPT_TEMPLATE_USER "template_user"
59 #define PAM_OPT_NAS_ID "nas_id"
60 #define PAM_OPT_NAS_IPADDR "nas_ipaddr"
62 #define MAX_CHALLENGE_MSGS 10
63 #define PASSWORD_PROMPT "RADIUS Password:"
65 static int build_access_request(struct rad_handle *, const char *,
66 const char *, const char *, const char *, const void *,
68 static int do_accept(pam_handle_t *, struct rad_handle *);
69 static int do_challenge(pam_handle_t *, struct rad_handle *,
70 const char *, const char *, const char *);
73 * Construct an access request, but don't send it. Returns 0 on success,
77 build_access_request(struct rad_handle *radh, const char *user,
78 const char *pass, const char *nas_id, const char *nas_ipaddr,
79 const void *state, size_t state_len)
82 char host[MAXHOSTNAMELEN];
83 struct sockaddr_in *haddr;
84 struct addrinfo hints;
87 if (rad_create_request(radh, RAD_ACCESS_REQUEST) == -1) {
88 syslog(LOG_CRIT, "rad_create_request: %s", rad_strerror(radh));
92 (nas_ipaddr != NULL && strlen(nas_ipaddr) == 0)) {
93 if (gethostname(host, sizeof host) != -1) {
96 if (nas_ipaddr != NULL && strlen(nas_ipaddr) == 0)
101 rad_put_string(radh, RAD_USER_NAME, user) == -1) ||
103 rad_put_string(radh, RAD_USER_PASSWORD, pass) == -1) ||
105 rad_put_string(radh, RAD_NAS_IDENTIFIER, nas_id) == -1)) {
106 syslog(LOG_CRIT, "rad_put_string: %s", rad_strerror(radh));
109 if (nas_ipaddr != NULL) {
110 memset(&hints, 0, sizeof(hints));
111 hints.ai_family = AF_INET;
112 if (getaddrinfo(nas_ipaddr, NULL, &hints, &res) == 0 &&
113 res != NULL && res->ai_family == AF_INET) {
114 haddr = (struct sockaddr_in *)res->ai_addr;
115 error = rad_put_addr(radh, RAD_NAS_IP_ADDRESS,
119 syslog(LOG_CRIT, "rad_put_addr: %s",
125 if (state != NULL && rad_put_attr(radh, RAD_STATE, state,
127 syslog(LOG_CRIT, "rad_put_attr: %s", rad_strerror(radh));
130 if (rad_put_int(radh, RAD_SERVICE_TYPE, RAD_AUTHENTICATE_ONLY) == -1) {
131 syslog(LOG_CRIT, "rad_put_int: %s", rad_strerror(radh));
138 do_accept(pam_handle_t *pamh, struct rad_handle *radh)
145 while ((attrtype = rad_get_attr(radh, &attrval, &attrlen)) > 0) {
146 if (attrtype == RAD_USER_NAME) {
147 s = rad_cvt_string(attrval, attrlen);
150 "rad_cvt_string: out of memory");
153 pam_set_item(pamh, PAM_USER, s);
157 if (attrtype == -1) {
158 syslog(LOG_CRIT, "rad_get_attr: %s", rad_strerror(radh));
165 do_challenge(pam_handle_t *pamh, struct rad_handle *radh, const char *user,
166 const char *nas_id, const char *nas_ipaddr)
174 struct pam_message msgs[MAX_CHALLENGE_MSGS];
175 const struct pam_message *msg_ptrs[MAX_CHALLENGE_MSGS];
176 struct pam_response *resp;
179 const struct pam_conv *conv;
184 while ((attrtype = rad_get_attr(radh, &attrval, &attrlen)) > 0) {
192 case RAD_REPLY_MESSAGE:
193 if (num_msgs >= MAX_CHALLENGE_MSGS) {
195 "Too many RADIUS challenge messages");
196 return (PAM_SERVICE_ERR);
198 msgs[num_msgs].msg = rad_cvt_string(attrval, attrlen);
199 if (msgs[num_msgs].msg == NULL) {
201 "rad_cvt_string: out of memory");
202 return (PAM_SERVICE_ERR);
204 msgs[num_msgs].msg_style = PAM_TEXT_INFO;
205 msg_ptrs[num_msgs] = &msgs[num_msgs];
210 if (attrtype == -1) {
211 syslog(LOG_CRIT, "rad_get_attr: %s", rad_strerror(radh));
212 return (PAM_SERVICE_ERR);
215 msgs[num_msgs].msg = strdup("(null RADIUS challenge): ");
216 if (msgs[num_msgs].msg == NULL) {
217 syslog(LOG_CRIT, "Out of memory");
218 return (PAM_SERVICE_ERR);
220 msgs[num_msgs].msg_style = PAM_TEXT_INFO;
221 msg_ptrs[num_msgs] = &msgs[num_msgs];
224 msgs[num_msgs-1].msg_style = PAM_PROMPT_ECHO_ON;
225 if ((retval = pam_get_item(pamh, PAM_CONV, &item)) != PAM_SUCCESS) {
226 syslog(LOG_CRIT, "do_challenge: cannot get PAM_CONV");
229 conv = (const struct pam_conv *)item;
230 if ((retval = conv->conv(num_msgs, msg_ptrs, &resp,
231 conv->appdata_ptr)) != PAM_SUCCESS)
233 if (build_access_request(radh, user, resp[num_msgs-1].resp, nas_id,
234 nas_ipaddr, state, statelen) == -1)
235 return (PAM_SERVICE_ERR);
236 memset(resp[num_msgs-1].resp, 0, strlen(resp[num_msgs-1].resp));
237 free(resp[num_msgs-1].resp);
240 free(msgs[--num_msgs].msg);
241 return (PAM_SUCCESS);
245 pam_sm_authenticate(pam_handle_t *pamh, int flags __unused,
246 int argc __unused, const char *argv[] __unused)
248 struct rad_handle *radh;
249 const char *user, *pass;
251 const char *conf_file, *template_user, *nas_id, *nas_ipaddr;
255 conf_file = openpam_get_option(pamh, PAM_OPT_CONF);
256 template_user = openpam_get_option(pamh, PAM_OPT_TEMPLATE_USER);
257 nas_id = openpam_get_option(pamh, PAM_OPT_NAS_ID);
258 nas_ipaddr = openpam_get_option(pamh, PAM_OPT_NAS_IPADDR);
260 retval = pam_get_user(pamh, &user, NULL);
261 if (retval != PAM_SUCCESS)
264 PAM_LOG("Got user: %s", user);
266 retval = pam_get_authtok(pamh, PAM_AUTHTOK, &pass, PASSWORD_PROMPT);
267 if (retval != PAM_SUCCESS)
270 PAM_LOG("Got password");
274 syslog(LOG_CRIT, "rad_open failed");
275 return (PAM_SERVICE_ERR);
278 PAM_LOG("Radius opened");
280 if (rad_config(radh, conf_file) == -1) {
281 syslog(LOG_ALERT, "rad_config: %s", rad_strerror(radh));
283 return (PAM_SERVICE_ERR);
286 PAM_LOG("Radius config file read");
288 if (build_access_request(radh, user, pass, nas_id, nas_ipaddr, NULL,
291 return (PAM_SERVICE_ERR);
294 PAM_LOG("Radius build access done");
297 switch (rad_send_request(radh)) {
299 case RAD_ACCESS_ACCEPT:
300 e = do_accept(pamh, radh);
303 return (PAM_SERVICE_ERR);
304 if (template_user != NULL) {
306 PAM_LOG("Trying template user: %s",
310 * If the given user name doesn't exist in
311 * the local password database, change it
312 * to the value given in the "template_user"
315 retval = pam_get_item(pamh, PAM_USER, &tmpuser);
316 if (retval != PAM_SUCCESS)
318 if (getpwnam(tmpuser) == NULL) {
319 pam_set_item(pamh, PAM_USER,
321 PAM_LOG("Using template user");
325 return (PAM_SUCCESS);
327 case RAD_ACCESS_REJECT:
329 PAM_VERBOSE_ERROR("Radius rejection");
330 return (PAM_AUTH_ERR);
332 case RAD_ACCESS_CHALLENGE:
333 retval = do_challenge(pamh, radh, user, nas_id,
335 if (retval != PAM_SUCCESS) {
342 syslog(LOG_CRIT, "rad_send_request: %s",
345 PAM_VERBOSE_ERROR("Radius failure");
346 return (PAM_AUTHINFO_UNAVAIL);
350 "rad_send_request: unexpected return value");
352 PAM_VERBOSE_ERROR("Radius error");
353 return (PAM_SERVICE_ERR);
359 pam_sm_setcred(pam_handle_t *pamh __unused, int flags __unused,
360 int argc __unused, const char *argv[] __unused)
363 return (PAM_SUCCESS);
366 PAM_MODULE_ENTRY("pam_radius");