2 * rlm_eap_ttls.c contains the interfaces that are called from eap
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20 * Copyright 2003 Alan DeKok <aland@freeradius.org>
27 typedef struct rlm_eap_ttls_t {
29 * Default tunneled EAP type
31 char *default_eap_type_name;
35 * Use the reply attributes from the tunneled session in
36 * the non-tunneled reply to the client.
38 int use_tunneled_reply;
41 * Use SOME of the request attributes from outside of the
42 * tunneled session in the tunneled request
44 int copy_request_to_tunnel;
48 static CONF_PARSER module_config[] = {
49 { "default_eap_type", PW_TYPE_STRING_PTR,
50 offsetof(rlm_eap_ttls_t, default_eap_type_name), NULL, "md5" },
52 { "copy_request_to_tunnel", PW_TYPE_BOOLEAN,
53 offsetof(rlm_eap_ttls_t, copy_request_to_tunnel), NULL, "no" },
55 { "use_tunneled_reply", PW_TYPE_BOOLEAN,
56 offsetof(rlm_eap_ttls_t, use_tunneled_reply), NULL, "no" },
58 { NULL, -1, 0, NULL, NULL } /* end the list */
64 static int eapttls_detach(void *arg)
66 rlm_eap_ttls_t *inst = (rlm_eap_ttls_t *) arg;
68 if (inst->default_eap_type_name) free(inst->default_eap_type_name);
78 static int eapttls_attach(CONF_SECTION *cs, void **instance)
82 inst = malloc(sizeof(*inst));
84 radlog(L_ERR, "rlm_eap_ttls: out of memory");
87 memset(inst, 0, sizeof(*inst));
90 * Parse the configuration attributes.
92 if (cf_section_parse(cs, inst, module_config) < 0) {
98 * Convert the name to an integer, to make it easier to
101 inst->default_eap_type = eaptype_name2type(inst->default_eap_type_name);
102 if (inst->default_eap_type < 0) {
103 radlog(L_ERR, "rlm_eap_ttls: Unknown EAP type %s",
104 inst->default_eap_type_name);
105 eapttls_detach(inst);
110 * Can't tunnel TLS inside of TLS, we don't like it.
112 * More realistically, we haven't tested it, so we don't
115 if ((inst->default_eap_type == PW_EAP_TLS) ||
116 (inst->default_eap_type == PW_EAP_TTLS) ||
117 (inst->default_eap_type == PW_EAP_PEAP)) {
118 radlog(L_ERR, "rlm_eap_ttls: Cannot tunnel EAP-Type/%s inside of TTLS",
119 inst->default_eap_type_name);
120 eapttls_detach(inst);
130 * Free the TTLS per-session data
132 static void ttls_free(void *p)
134 ttls_tunnel_t *t = (ttls_tunnel_t *) p;
139 DEBUG2(" TTLS: Freeing handler for user %s",
140 t->username->strvalue);
143 pairfree(&t->username);
150 * Free the TTLS per-session data
152 static ttls_tunnel_t *ttls_alloc(rlm_eap_ttls_t *inst)
156 t = rad_malloc(sizeof(*t));
157 memset(t, 0, sizeof(*t));
159 t->default_eap_type = inst->default_eap_type;
160 t->copy_request_to_tunnel = inst->copy_request_to_tunnel;
161 t->use_tunneled_reply = inst->use_tunneled_reply;
167 * Do authentication, by letting EAP-TLS do most of the work.
169 static int eapttls_authenticate(void *arg, EAP_HANDLER *handler)
172 eaptls_status_t status;
173 rlm_eap_ttls_t *inst = (rlm_eap_ttls_t *) arg;
174 tls_session_t *tls_session = (tls_session_t *) handler->opaque;
176 DEBUG2(" rlm_eap_ttls: Authenticate");
179 * Process TLS layer until done.
181 status = eaptls_process(handler);
182 DEBUG2(" eaptls_process returned %d\n", status);
185 * EAP-TLS handshake was successful, tell the
186 * client to keep talking.
188 * If this was EAP-TLS, we would just return
189 * an EAP-TLS-Success packet here.
192 eaptls_request(handler->eap_ds, tls_session);
196 * The TLS code is still working on the TLS
197 * exchange, and it's a valid TLS request.
204 * Handshake is done, proceed with decoding tunneled
211 * Anything else: fail.
218 * Session is established, proceed with decoding
221 DEBUG2(" rlm_eap_ttls: Session established. Proceeding to decode tunneled attributes.");
224 * We may need TTLS data associated with the session, so
225 * allocate it here, if it wasn't already alloacted.
227 if (!tls_session->opaque) {
228 tls_session->opaque = ttls_alloc(inst);
229 tls_session->free_opaque = ttls_free;
233 * Process the TTLS portion of the request.
235 rcode = eapttls_process(handler, tls_session);
237 case PW_AUTHENTICATION_REJECT:
238 eaptls_fail(handler->eap_ds, 0);
242 * Access-Challenge, continue tunneled conversation.
244 case PW_ACCESS_CHALLENGE:
245 eaptls_request(handler->eap_ds, tls_session);
249 * Success: Return MPPE keys.
251 case PW_AUTHENTICATION_ACK:
252 eaptls_success(handler->eap_ds, 0);
253 eaptls_gen_mppe_keys(&handler->request->reply->vps,
255 "ttls keying material");
259 * No response packet, MUST be proxying it.
260 * The main EAP module will take care of discovering
261 * that the request now has a "proxy" packet, and
262 * will proxy it, rather than returning an EAP packet.
264 case PW_STATUS_CLIENT:
265 rad_assert(handler->request->proxy != NULL);
274 * Something we don't understand: Reject it.
276 eaptls_fail(handler->eap_ds, 0);
281 * The module name should be the only globally exported symbol.
282 * That is, everything else should be 'static'.
284 EAP_TYPE rlm_eap_ttls = {
286 eapttls_attach, /* attach */
288 * Note! There is NO eapttls_initate() function, as the
289 * main EAP module takes care of calling
292 * This is because TTLS is a protocol on top of TLS, so
293 * before we need to do TTLS, we've got to initiate a TLS
296 NULL, /* Start the initial request */
297 NULL, /* authorization */
298 eapttls_authenticate, /* authentication */
299 eapttls_detach /* detach */