Use name from initialization to access settings in libcharon.
[strongswan.git] / src / libcharon / plugins / eap_radius / eap_radius.c
1 /*
2 * Copyright (C) 2009 Martin Willi
3 * Hochschule fuer Technik Rapperswil
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms of the GNU General Public License as published by the
7 * Free Software Foundation; either version 2 of the License, or (at your
8 * option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
9 *
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
13 * for more details.
14 */
15
16 #include "eap_radius.h"
17 #include "eap_radius_plugin.h"
18 #include "eap_radius_forward.h"
19
20 #include <radius_message.h>
21 #include <radius_client.h>
22
23 #include <daemon.h>
24
25 typedef struct private_eap_radius_t private_eap_radius_t;
26
27 /**
28 * Private data of an eap_radius_t object.
29 */
30 struct private_eap_radius_t {
31
32 /**
33 * Public authenticator_t interface.
34 */
35 eap_radius_t public;
36
37 /**
38 * ID of the server
39 */
40 identification_t *server;
41
42 /**
43 * ID of the peer
44 */
45 identification_t *peer;
46
47 /**
48 * EAP method type we are proxying
49 */
50 eap_type_t type;
51
52 /**
53 * EAP vendor, if any
54 */
55 u_int32_t vendor;
56
57 /**
58 * EAP message identifier
59 */
60 u_int8_t identifier;
61
62 /**
63 * RADIUS client instance
64 */
65 radius_client_t *client;
66
67 /**
68 * TRUE to use EAP-Start, FALSE to send EAP-Identity Response directly
69 */
70 bool eap_start;
71
72 /**
73 * Prefix to prepend to EAP identity
74 */
75 char *id_prefix;
76
77 /**
78 * Handle the Class attribute as group membership information?
79 */
80 bool class_group;
81
82 /**
83 * Handle the Filter-Id attribute as IPsec CHILD_SA name?
84 */
85 bool filter_id;
86 };
87
88 /**
89 * Add EAP-Identity to RADIUS message
90 */
91 static void add_eap_identity(private_eap_radius_t *this,
92 radius_message_t *request)
93 {
94 struct {
95 /** EAP code (REQUEST/RESPONSE) */
96 u_int8_t code;
97 /** unique message identifier */
98 u_int8_t identifier;
99 /** length of whole message */
100 u_int16_t length;
101 /** EAP type */
102 u_int8_t type;
103 /** identity data */
104 u_int8_t data[];
105 } __attribute__((__packed__)) *hdr;
106 chunk_t id, prefix;
107 size_t len;
108
109 id = this->peer->get_encoding(this->peer);
110 prefix = chunk_create(this->id_prefix, strlen(this->id_prefix));
111 len = sizeof(*hdr) + prefix.len + id.len;
112
113 hdr = alloca(len);
114 hdr->code = EAP_RESPONSE;
115 hdr->identifier = this->identifier;
116 hdr->length = htons(len);
117 hdr->type = EAP_IDENTITY;
118 memcpy(hdr->data, prefix.ptr, prefix.len);
119 memcpy(hdr->data + prefix.len, id.ptr, id.len);
120
121 request->add(request, RAT_EAP_MESSAGE, chunk_create((u_char*)hdr, len));
122 }
123
124 /**
125 * Copy EAP-Message attribute from RADIUS message to an new EAP payload
126 */
127 static bool radius2ike(private_eap_radius_t *this,
128 radius_message_t *msg, eap_payload_t **out)
129 {
130 enumerator_t *enumerator;
131 eap_payload_t *payload;
132 chunk_t data, message = chunk_empty;
133 int type;
134
135 enumerator = msg->create_enumerator(msg);
136 while (enumerator->enumerate(enumerator, &type, &data))
137 {
138 if (type == RAT_EAP_MESSAGE && data.len)
139 {
140 message = chunk_cat("mc", message, data);
141 }
142 }
143 enumerator->destroy(enumerator);
144 if (message.len)
145 {
146 *out = payload = eap_payload_create_data(message);
147
148 /* apply EAP method selected by RADIUS server */
149 this->type = payload->get_type(payload, &this->vendor);
150
151 DBG3(DBG_IKE, "%N payload %B", eap_type_names, this->type, &message);
152 free(message.ptr);
153 return TRUE;
154 }
155 return FALSE;
156 }
157
158 METHOD(eap_method_t, initiate, status_t,
159 private_eap_radius_t *this, eap_payload_t **out)
160 {
161 radius_message_t *request, *response;
162 status_t status = FAILED;
163 chunk_t username;
164
165 request = radius_message_create(RMC_ACCESS_REQUEST);
166 username = chunk_create(this->id_prefix, strlen(this->id_prefix));
167 username = chunk_cata("cc", username, this->peer->get_encoding(this->peer));
168 request->add(request, RAT_USER_NAME, username);
169
170 if (this->eap_start)
171 {
172 request->add(request, RAT_EAP_MESSAGE, chunk_empty);
173 }
174 else
175 {
176 add_eap_identity(this, request);
177 }
178 eap_radius_forward_from_ike(request);
179
180 response = this->client->request(this->client, request);
181 if (response)
182 {
183 eap_radius_forward_to_ike(response);
184 if (radius2ike(this, response, out))
185 {
186 status = NEED_MORE;
187 }
188 response->destroy(response);
189 }
190 else
191 {
192 charon->bus->alert(charon->bus, ALERT_RADIUS_NOT_RESPONDING);
193 }
194 request->destroy(request);
195 return status;
196 }
197
198 /**
199 * Handle the Class attribute as group membership information
200 */
201 static void process_class(private_eap_radius_t *this, radius_message_t *msg)
202 {
203 enumerator_t *enumerator;
204 chunk_t data;
205 int type;
206
207 enumerator = msg->create_enumerator(msg);
208 while (enumerator->enumerate(enumerator, &type, &data))
209 {
210 if (type == RAT_CLASS)
211 {
212 identification_t *id;
213 ike_sa_t *ike_sa;
214 auth_cfg_t *auth;
215
216 if (data.len >= 44)
217 { /* quirk: ignore long class attributes, these are used for
218 * other purposes by some RADIUS servers (such as NPS). */
219 continue;
220 }
221
222 ike_sa = charon->bus->get_sa(charon->bus);
223 if (ike_sa)
224 {
225 auth = ike_sa->get_auth_cfg(ike_sa, FALSE);
226 id = identification_create_from_data(data);
227 DBG1(DBG_CFG, "received group membership '%Y' from RADIUS", id);
228 auth->add(auth, AUTH_RULE_GROUP, id);
229 }
230 }
231 }
232 enumerator->destroy(enumerator);
233 }
234
235 /**
236 * Handle the Filter-Id attribute as IPsec CHILD_SA name
237 */
238 static void process_filter_id(private_eap_radius_t *this, radius_message_t *msg)
239 {
240 enumerator_t *enumerator;
241 int type;
242 u_int8_t tunnel_tag;
243 u_int32_t tunnel_type;
244 chunk_t filter_id = chunk_empty, data;
245 bool is_esp_tunnel = FALSE;
246
247 enumerator = msg->create_enumerator(msg);
248 while (enumerator->enumerate(enumerator, &type, &data))
249 {
250 switch (type)
251 {
252 case RAT_TUNNEL_TYPE:
253 if (data.len != 4)
254 {
255 continue;
256 }
257 tunnel_tag = *data.ptr;
258 *data.ptr = 0x00;
259 tunnel_type = untoh32(data.ptr);
260 DBG1(DBG_IKE, "received RADIUS attribute Tunnel-Type: "
261 "tag = %u, value = %u", tunnel_tag, tunnel_type);
262 is_esp_tunnel = (tunnel_type == RADIUS_TUNNEL_TYPE_ESP);
263 break;
264 case RAT_FILTER_ID:
265 filter_id = data;
266 DBG1(DBG_IKE, "received RADIUS attribute Filter-Id: "
267 "'%.*s'", filter_id.len, filter_id.ptr);
268 break;
269 default:
270 break;
271 }
272 }
273 enumerator->destroy(enumerator);
274
275 if (is_esp_tunnel && filter_id.len)
276 {
277 identification_t *id;
278 ike_sa_t *ike_sa;
279 auth_cfg_t *auth;
280
281 ike_sa = charon->bus->get_sa(charon->bus);
282 if (ike_sa)
283 {
284 auth = ike_sa->get_auth_cfg(ike_sa, FALSE);
285 id = identification_create_from_data(filter_id);
286 auth->add(auth, AUTH_RULE_GROUP, id);
287 }
288 }
289 }
290
291 /**
292 * Handle Session-Timeout attribte
293 */
294 static void process_timeout(private_eap_radius_t *this, radius_message_t *msg)
295 {
296 enumerator_t *enumerator;
297 ike_sa_t *ike_sa;
298 chunk_t data;
299 int type;
300
301 enumerator = msg->create_enumerator(msg);
302 while (enumerator->enumerate(enumerator, &type, &data))
303 {
304 if (type == RAT_SESSION_TIMEOUT && data.len == 4)
305 {
306 ike_sa = charon->bus->get_sa(charon->bus);
307 if (ike_sa)
308 {
309 ike_sa->set_auth_lifetime(ike_sa, untoh32(data.ptr));
310 }
311 }
312 }
313 enumerator->destroy(enumerator);
314 }
315
316 METHOD(eap_method_t, process, status_t,
317 private_eap_radius_t *this, eap_payload_t *in, eap_payload_t **out)
318 {
319 radius_message_t *request, *response;
320 status_t status = FAILED;
321 chunk_t data;
322
323 request = radius_message_create(RMC_ACCESS_REQUEST);
324 request->add(request, RAT_USER_NAME, this->peer->get_encoding(this->peer));
325 data = in->get_data(in);
326 DBG3(DBG_IKE, "%N payload %B", eap_type_names, this->type, &data);
327
328 /* fragment data suitable for RADIUS */
329 while (data.len > MAX_RADIUS_ATTRIBUTE_SIZE)
330 {
331 request->add(request, RAT_EAP_MESSAGE,
332 chunk_create(data.ptr,MAX_RADIUS_ATTRIBUTE_SIZE));
333 data = chunk_skip(data, MAX_RADIUS_ATTRIBUTE_SIZE);
334 }
335 request->add(request, RAT_EAP_MESSAGE, data);
336
337 eap_radius_forward_from_ike(request);
338 response = this->client->request(this->client, request);
339 if (response)
340 {
341 eap_radius_forward_to_ike(response);
342 switch (response->get_code(response))
343 {
344 case RMC_ACCESS_CHALLENGE:
345 if (radius2ike(this, response, out))
346 {
347 status = NEED_MORE;
348 break;
349 }
350 status = FAILED;
351 break;
352 case RMC_ACCESS_ACCEPT:
353 if (this->class_group)
354 {
355 process_class(this, response);
356 }
357 if (this->filter_id)
358 {
359 process_filter_id(this, response);
360 }
361 process_timeout(this, response);
362 DBG1(DBG_IKE, "RADIUS authentication of '%Y' successful",
363 this->peer);
364 status = SUCCESS;
365 break;
366 case RMC_ACCESS_REJECT:
367 default:
368 DBG1(DBG_IKE, "RADIUS authentication of '%Y' failed", this->peer);
369 status = FAILED;
370 break;
371 }
372 response->destroy(response);
373 }
374 request->destroy(request);
375 return status;
376 }
377
378 METHOD(eap_method_t, get_type, eap_type_t,
379 private_eap_radius_t *this, u_int32_t *vendor)
380 {
381 *vendor = this->vendor;
382 return this->type;
383 }
384
385 METHOD(eap_method_t, get_msk, status_t,
386 private_eap_radius_t *this, chunk_t *out)
387 {
388 chunk_t msk;
389
390 msk = this->client->get_msk(this->client);
391 if (msk.len)
392 {
393 *out = msk;
394 return SUCCESS;
395 }
396 return FAILED;
397 }
398
399 METHOD(eap_method_t, get_identifier, u_int8_t,
400 private_eap_radius_t *this)
401 {
402 return this->identifier;
403 }
404
405 METHOD(eap_method_t, set_identifier, void,
406 private_eap_radius_t *this, u_int8_t identifier)
407 {
408 this->identifier = identifier;
409 }
410
411 METHOD(eap_method_t, is_mutual, bool,
412 private_eap_radius_t *this)
413 {
414 switch (this->type)
415 {
416 case EAP_AKA:
417 case EAP_SIM:
418 return TRUE;
419 default:
420 return FALSE;
421 }
422 }
423
424 METHOD(eap_method_t, destroy, void,
425 private_eap_radius_t *this)
426 {
427 this->peer->destroy(this->peer);
428 this->server->destroy(this->server);
429 this->client->destroy(this->client);
430 free(this);
431 }
432
433 /**
434 * Generic constructor
435 */
436 eap_radius_t *eap_radius_create(identification_t *server, identification_t *peer)
437 {
438 private_eap_radius_t *this;
439
440 INIT(this,
441 .public = {
442 .eap_method = {
443 .initiate = _initiate,
444 .process = _process,
445 .get_type = _get_type,
446 .is_mutual = _is_mutual,
447 .get_msk = _get_msk,
448 .get_identifier = _get_identifier,
449 .set_identifier = _set_identifier,
450 .destroy = _destroy,
451 },
452 },
453 /* initially EAP_RADIUS, but is set to the method selected by RADIUS */
454 .type = EAP_RADIUS,
455 .eap_start = lib->settings->get_bool(lib->settings,
456 "%s.plugins.eap-radius.eap_start", FALSE,
457 charon->name),
458 .id_prefix = lib->settings->get_str(lib->settings,
459 "%s.plugins.eap-radius.id_prefix", "",
460 charon->name),
461 .class_group = lib->settings->get_bool(lib->settings,
462 "%s.plugins.eap-radius.class_group", FALSE,
463 charon->name),
464 .filter_id = lib->settings->get_bool(lib->settings,
465 "%s.plugins.eap-radius.filter_id", FALSE,
466 charon->name),
467 );
468 this->client = eap_radius_create_client();
469 if (!this->client)
470 {
471 free(this);
472 return NULL;
473 }
474 this->peer = peer->clone(peer);
475 this->server = server->clone(server);
476 return &this->public;
477 }
478