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Expand PMF_FN_* macros.
[netbsd-mini2440.git] / dist / wpa / src / eap_peer / eap_aka.c
blob304e20a4365399f635e14845ad531bfb27d9367c
1 /*
2 * EAP peer method: EAP-AKA (RFC 4187)
3 * Copyright (c) 2004-2007, Jouni Malinen <j@w1.fi>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * Alternatively, this software may be distributed under the terms of BSD
10 * license.
11 *
12 * See README and COPYING for more details.
13 */
14
15 #include "includes.h"
16
17 #include "common.h"
18 #include "eap_peer/eap_i.h"
19 #include "pcsc_funcs.h"
20 #include "eap_common/eap_sim_common.h"
21 #include "sha1.h"
22 #include "crypto.h"
23
24
25 struct eap_aka_data {
26 u8 ik[EAP_AKA_IK_LEN], ck[EAP_AKA_CK_LEN], res[EAP_AKA_RES_MAX_LEN];
27 size_t res_len;
28 u8 nonce_s[EAP_SIM_NONCE_S_LEN];
29 u8 mk[EAP_SIM_MK_LEN];
30 u8 k_aut[EAP_SIM_K_AUT_LEN];
31 u8 k_encr[EAP_SIM_K_ENCR_LEN];
32 u8 msk[EAP_SIM_KEYING_DATA_LEN];
33 u8 emsk[EAP_EMSK_LEN];
34 u8 rand[EAP_AKA_RAND_LEN], autn[EAP_AKA_AUTN_LEN];
35 u8 auts[EAP_AKA_AUTS_LEN];
36
37 int num_id_req, num_notification;
38 u8 *pseudonym;
39 size_t pseudonym_len;
40 u8 *reauth_id;
41 size_t reauth_id_len;
42 int reauth;
43 unsigned int counter, counter_too_small;
44 u8 *last_eap_identity;
45 size_t last_eap_identity_len;
46 enum {
47 CONTINUE, RESULT_SUCCESS, RESULT_FAILURE, SUCCESS, FAILURE
48 } state;
49
50 struct wpabuf *id_msgs;
51 int prev_id;
52 int result_ind, use_result_ind;
53 };
54
55
56 #ifndef CONFIG_NO_STDOUT_DEBUG
57 static const char * eap_aka_state_txt(int state)
58 {
59 switch (state) {
60 case CONTINUE:
61 return "CONTINUE";
62 case RESULT_SUCCESS:
63 return "RESULT_SUCCESS";
64 case RESULT_FAILURE:
65 return "RESULT_FAILURE";
66 case SUCCESS:
67 return "SUCCESS";
68 case FAILURE:
69 return "FAILURE";
70 default:
71 return "?";
72 }
73 }
74 #endif /* CONFIG_NO_STDOUT_DEBUG */
75
76
77 static void eap_aka_state(struct eap_aka_data *data, int state)
78 {
79 wpa_printf(MSG_DEBUG, "EAP-AKA: %s -> %s",
80 eap_aka_state_txt(data->state),
81 eap_aka_state_txt(state));
82 data->state = state;
83 }
84
85
86 static void * eap_aka_init(struct eap_sm *sm)
87 {
88 struct eap_aka_data *data;
89 const char *phase1 = eap_get_config_phase1(sm);
90
91 data = os_zalloc(sizeof(*data));
92 if (data == NULL)
93 return NULL;
94
95 eap_aka_state(data, CONTINUE);
96 data->prev_id = -1;
97
98 data->result_ind = phase1 && os_strstr(phase1, "result_ind=1") != NULL;
99
100 return data;
101 }
102
103
104 static void eap_aka_deinit(struct eap_sm *sm, void *priv)
105 {
106 struct eap_aka_data *data = priv;
107 if (data) {
108 os_free(data->pseudonym);
109 os_free(data->reauth_id);
110 os_free(data->last_eap_identity);
111 wpabuf_free(data->id_msgs);
112 os_free(data);
113 }
114 }
115
116
117 static int eap_aka_umts_auth(struct eap_sm *sm, struct eap_aka_data *data)
118 {
119 wpa_printf(MSG_DEBUG, "EAP-AKA: UMTS authentication algorithm");
120 #ifdef PCSC_FUNCS
121 return scard_umts_auth(sm->scard_ctx, data->rand,
122 data->autn, data->res, &data->res_len,
123 data->ik, data->ck, data->auts);
124 #else /* PCSC_FUNCS */
125 /* These hardcoded Kc and SRES values are used for testing.
126 * Could consider making them configurable. */
127 os_memset(data->res, '2', EAP_AKA_RES_MAX_LEN);
128 data->res_len = EAP_AKA_RES_MAX_LEN;
129 os_memset(data->ik, '3', EAP_AKA_IK_LEN);
130 os_memset(data->ck, '4', EAP_AKA_CK_LEN);
131 {
132 u8 autn[EAP_AKA_AUTN_LEN];
133 os_memset(autn, '1', EAP_AKA_AUTN_LEN);
134 if (os_memcmp(autn, data->autn, EAP_AKA_AUTN_LEN) != 0) {
135 wpa_printf(MSG_WARNING, "EAP-AKA: AUTN did not match "
136 "with expected value");
137 return -1;
138 }
139 }
140 #if 0
141 {
142 static int test_resync = 1;
143 if (test_resync) {
144 /* Test Resynchronization */
145 test_resync = 0;
146 return -2;
147 }
148 }
149 #endif
150 return 0;
151 #endif /* PCSC_FUNCS */
152 }
153
154
155 #define CLEAR_PSEUDONYM 0x01
156 #define CLEAR_REAUTH_ID 0x02
157 #define CLEAR_EAP_ID 0x04
158
159 static void eap_aka_clear_identities(struct eap_aka_data *data, int id)
160 {
161 wpa_printf(MSG_DEBUG, "EAP-AKA: forgetting old%s%s%s",
162 id & CLEAR_PSEUDONYM ? " pseudonym" : "",
163 id & CLEAR_REAUTH_ID ? " reauth_id" : "",
164 id & CLEAR_EAP_ID ? " eap_id" : "");
165 if (id & CLEAR_PSEUDONYM) {
166 os_free(data->pseudonym);
167 data->pseudonym = NULL;
168 data->pseudonym_len = 0;
169 }
170 if (id & CLEAR_REAUTH_ID) {
171 os_free(data->reauth_id);
172 data->reauth_id = NULL;
173 data->reauth_id_len = 0;
174 }
175 if (id & CLEAR_EAP_ID) {
176 os_free(data->last_eap_identity);
177 data->last_eap_identity = NULL;
178 data->last_eap_identity_len = 0;
179 }
180 }
181
182
183 static int eap_aka_learn_ids(struct eap_aka_data *data,
184 struct eap_sim_attrs *attr)
185 {
186 if (attr->next_pseudonym) {
187 os_free(data->pseudonym);
188 data->pseudonym = os_malloc(attr->next_pseudonym_len);
189 if (data->pseudonym == NULL) {
190 wpa_printf(MSG_INFO, "EAP-AKA: (encr) No memory for "
191 "next pseudonym");
192 return -1;
193 }
194 os_memcpy(data->pseudonym, attr->next_pseudonym,
195 attr->next_pseudonym_len);
196 data->pseudonym_len = attr->next_pseudonym_len;
197 wpa_hexdump_ascii(MSG_DEBUG,
198 "EAP-AKA: (encr) AT_NEXT_PSEUDONYM",
199 data->pseudonym,
200 data->pseudonym_len);
201 }
202
203 if (attr->next_reauth_id) {
204 os_free(data->reauth_id);
205 data->reauth_id = os_malloc(attr->next_reauth_id_len);
206 if (data->reauth_id == NULL) {
207 wpa_printf(MSG_INFO, "EAP-AKA: (encr) No memory for "
208 "next reauth_id");
209 return -1;
210 }
211 os_memcpy(data->reauth_id, attr->next_reauth_id,
212 attr->next_reauth_id_len);
213 data->reauth_id_len = attr->next_reauth_id_len;
214 wpa_hexdump_ascii(MSG_DEBUG,
215 "EAP-AKA: (encr) AT_NEXT_REAUTH_ID",
216 data->reauth_id,
217 data->reauth_id_len);
218 }
219
220 return 0;
221 }
222
223
224 static int eap_aka_add_id_msg(struct eap_aka_data *data,
225 const struct wpabuf *msg)
226 {
227 if (msg == NULL)
228 return -1;
229
230 if (data->id_msgs == NULL) {
231 data->id_msgs = wpabuf_dup(msg);
232 return data->id_msgs == NULL ? -1 : 0;
233 }
234
235 if (wpabuf_resize(&data->id_msgs, wpabuf_len(msg)) < 0)
236 return -1;
237 wpabuf_put_buf(data->id_msgs, msg);
238
239 return 0;
240 }
241
242
243 static void eap_aka_add_checkcode(struct eap_aka_data *data,
244 struct eap_sim_msg *msg)
245 {
246 const u8 *addr;
247 size_t len;
248 u8 hash[SHA1_MAC_LEN];
249
250 wpa_printf(MSG_DEBUG, " AT_CHECKCODE");
251
252 if (data->id_msgs == NULL) {
253 /*
254 * No EAP-AKA/Identity packets were exchanged - send empty
255 * checkcode.
256 */
257 eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, NULL, 0);
258 return;
259 }
260
261 /* Checkcode is SHA1 hash over all EAP-AKA/Identity packets. */
262 addr = wpabuf_head(data->id_msgs);
263 len = wpabuf_len(data->id_msgs);
264 wpa_hexdump(MSG_MSGDUMP, "EAP-AKA: AT_CHECKCODE data", addr, len);
265 sha1_vector(1, &addr, &len, hash);
266
267 eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, hash,
268 EAP_AKA_CHECKCODE_LEN);
269 }
270
271
272 static int eap_aka_verify_checkcode(struct eap_aka_data *data,
273 const u8 *checkcode, size_t checkcode_len)
274 {
275 const u8 *addr;
276 size_t len;
277 u8 hash[SHA1_MAC_LEN];
278
279 if (checkcode == NULL)
280 return -1;
281
282 if (data->id_msgs == NULL) {
283 if (checkcode_len != 0) {
284 wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from server "
285 "indicates that AKA/Identity messages were "
286 "used, but they were not");
287 return -1;
288 }
289 return 0;
290 }
291
292 if (checkcode_len != EAP_AKA_CHECKCODE_LEN) {
293 wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from server "
294 "indicates that AKA/Identity message were not "
295 "used, but they were");
296 return -1;
297 }
298
299 /* Checkcode is SHA1 hash over all EAP-AKA/Identity packets. */
300 addr = wpabuf_head(data->id_msgs);
301 len = wpabuf_len(data->id_msgs);
302 sha1_vector(1, &addr, &len, hash);
303
304 if (os_memcmp(hash, checkcode, EAP_AKA_CHECKCODE_LEN) != 0) {
305 wpa_printf(MSG_DEBUG, "EAP-AKA: Mismatch in AT_CHECKCODE");
306 return -1;
307 }
308
309 return 0;
310 }
311
312
313 static struct wpabuf * eap_aka_client_error(struct eap_aka_data *data, u8 id,
314 int err)
315 {
316 struct eap_sim_msg *msg;
317
318 eap_aka_state(data, FAILURE);
319 data->num_id_req = 0;
320 data->num_notification = 0;
321
322 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_AKA,
323 EAP_AKA_SUBTYPE_CLIENT_ERROR);
324 eap_sim_msg_add(msg, EAP_SIM_AT_CLIENT_ERROR_CODE, err, NULL, 0);
325 return eap_sim_msg_finish(msg, NULL, NULL, 0);
326 }
327
328
329 static struct wpabuf * eap_aka_authentication_reject(struct eap_aka_data *data,
330 u8 id)
331 {
332 struct eap_sim_msg *msg;
333
334 eap_aka_state(data, FAILURE);
335 data->num_id_req = 0;
336 data->num_notification = 0;
337
338 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Authentication-Reject "
339 "(id=%d)", id);
340 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_AKA,
341 EAP_AKA_SUBTYPE_AUTHENTICATION_REJECT);
342 return eap_sim_msg_finish(msg, NULL, NULL, 0);
343 }
344
345
346 static struct wpabuf * eap_aka_synchronization_failure(
347 struct eap_aka_data *data, u8 id)
348 {
349 struct eap_sim_msg *msg;
350
351 data->num_id_req = 0;
352 data->num_notification = 0;
353
354 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Synchronization-Failure "
355 "(id=%d)", id);
356 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_AKA,
357 EAP_AKA_SUBTYPE_SYNCHRONIZATION_FAILURE);
358 wpa_printf(MSG_DEBUG, " AT_AUTS");
359 eap_sim_msg_add_full(msg, EAP_SIM_AT_AUTS, data->auts,
360 EAP_AKA_AUTS_LEN);
361 return eap_sim_msg_finish(msg, NULL, NULL, 0);
362 }
363
364
365 static struct wpabuf * eap_aka_response_identity(struct eap_sm *sm,
366 struct eap_aka_data *data,
367 u8 id,
368 enum eap_sim_id_req id_req)
369 {
370 const u8 *identity = NULL;
371 size_t identity_len = 0;
372 struct eap_sim_msg *msg;
373
374 data->reauth = 0;
375 if (id_req == ANY_ID && data->reauth_id) {
376 identity = data->reauth_id;
377 identity_len = data->reauth_id_len;
378 data->reauth = 1;
379 } else if ((id_req == ANY_ID || id_req == FULLAUTH_ID) &&
380 data->pseudonym) {
381 identity = data->pseudonym;
382 identity_len = data->pseudonym_len;
383 eap_aka_clear_identities(data, CLEAR_REAUTH_ID);
384 } else if (id_req != NO_ID_REQ) {
385 identity = eap_get_config_identity(sm, &identity_len);
386 if (identity) {
387 eap_aka_clear_identities(data, CLEAR_PSEUDONYM |
388 CLEAR_REAUTH_ID);
389 }
390 }
391 if (id_req != NO_ID_REQ)
392 eap_aka_clear_identities(data, CLEAR_EAP_ID);
393
394 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Identity (id=%d)", id);
395 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_AKA,
396 EAP_AKA_SUBTYPE_IDENTITY);
397
398 if (identity) {
399 wpa_hexdump_ascii(MSG_DEBUG, " AT_IDENTITY",
400 identity, identity_len);
401 eap_sim_msg_add(msg, EAP_SIM_AT_IDENTITY, identity_len,
402 identity, identity_len);
403 }
404
405 return eap_sim_msg_finish(msg, NULL, NULL, 0);
406 }
407
408
409 static struct wpabuf * eap_aka_response_challenge(struct eap_aka_data *data,
410 u8 id)
411 {
412 struct eap_sim_msg *msg;
413
414 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Challenge (id=%d)", id);
415 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_AKA,
416 EAP_AKA_SUBTYPE_CHALLENGE);
417 wpa_printf(MSG_DEBUG, " AT_RES");
418 eap_sim_msg_add(msg, EAP_SIM_AT_RES, data->res_len,
419 data->res, data->res_len);
420 eap_aka_add_checkcode(data, msg);
421 if (data->use_result_ind) {
422 wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
423 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
424 }
425 wpa_printf(MSG_DEBUG, " AT_MAC");
426 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
427 return eap_sim_msg_finish(msg, data->k_aut, (u8 *) "", 0);
428 }
429
430
431 static struct wpabuf * eap_aka_response_reauth(struct eap_aka_data *data,
432 u8 id, int counter_too_small,
433 const u8 *nonce_s)
434 {
435 struct eap_sim_msg *msg;
436 unsigned int counter;
437
438 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Reauthentication (id=%d)",
439 id);
440 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_AKA,
441 EAP_AKA_SUBTYPE_REAUTHENTICATION);
442 wpa_printf(MSG_DEBUG, " AT_IV");
443 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
444 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA);
445
446 if (counter_too_small) {
447 wpa_printf(MSG_DEBUG, " *AT_COUNTER_TOO_SMALL");
448 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER_TOO_SMALL, 0, NULL, 0);
449 counter = data->counter_too_small;
450 } else
451 counter = data->counter;
452
453 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", counter);
454 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0);
455
456 if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) {
457 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to encrypt "
458 "AT_ENCR_DATA");
459 eap_sim_msg_free(msg);
460 return NULL;
461 }
462 eap_aka_add_checkcode(data, msg);
463 if (data->use_result_ind) {
464 wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
465 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
466 }
467 wpa_printf(MSG_DEBUG, " AT_MAC");
468 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
469 return eap_sim_msg_finish(msg, data->k_aut, nonce_s,
470 EAP_SIM_NONCE_S_LEN);
471 }
472
473
474 static struct wpabuf * eap_aka_response_notification(struct eap_aka_data *data,
475 u8 id, u16 notification)
476 {
477 struct eap_sim_msg *msg;
478 u8 *k_aut = (notification & 0x4000) == 0 ? data->k_aut : NULL;
479
480 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Notification (id=%d)", id);
481 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_AKA,
482 EAP_AKA_SUBTYPE_NOTIFICATION);
483 if (k_aut && data->reauth) {
484 wpa_printf(MSG_DEBUG, " AT_IV");
485 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
486 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV,
487 EAP_SIM_AT_ENCR_DATA);
488 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", data->counter);
489 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter,
490 NULL, 0);
491 if (eap_sim_msg_add_encr_end(msg, data->k_encr,
492 EAP_SIM_AT_PADDING)) {
493 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to encrypt "
494 "AT_ENCR_DATA");
495 eap_sim_msg_free(msg);
496 return NULL;
497 }
498 }
499 if (k_aut) {
500 wpa_printf(MSG_DEBUG, " AT_MAC");
501 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
502 }
503 return eap_sim_msg_finish(msg, k_aut, (u8 *) "", 0);
504 }
505
506
507 static struct wpabuf * eap_aka_process_identity(struct eap_sm *sm,
508 struct eap_aka_data *data,
509 u8 id,
510 const struct wpabuf *reqData,
511 struct eap_sim_attrs *attr)
512 {
513 int id_error;
514 struct wpabuf *buf;
515
516 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Identity");
517
518 id_error = 0;
519 switch (attr->id_req) {
520 case NO_ID_REQ:
521 break;
522 case ANY_ID:
523 if (data->num_id_req > 0)
524 id_error++;
525 data->num_id_req++;
526 break;
527 case FULLAUTH_ID:
528 if (data->num_id_req > 1)
529 id_error++;
530 data->num_id_req++;
531 break;
532 case PERMANENT_ID:
533 if (data->num_id_req > 2)
534 id_error++;
535 data->num_id_req++;
536 break;
537 }
538 if (id_error) {
539 wpa_printf(MSG_INFO, "EAP-AKA: Too many ID requests "
540 "used within one authentication");
541 return eap_aka_client_error(data, id,
542 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
543 }
544
545 buf = eap_aka_response_identity(sm, data, id, attr->id_req);
546
547 if (data->prev_id != id) {
548 eap_aka_add_id_msg(data, reqData);
549 eap_aka_add_id_msg(data, buf);
550 data->prev_id = id;
551 }
552
553 return buf;
554 }
555
556
557 static struct wpabuf * eap_aka_process_challenge(struct eap_sm *sm,
558 struct eap_aka_data *data,
559 u8 id,
560 const struct wpabuf *reqData,
561 struct eap_sim_attrs *attr)
562 {
563 const u8 *identity;
564 size_t identity_len;
565 int res;
566 struct eap_sim_attrs eattr;
567
568 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Challenge");
569
570 if (attr->checkcode &&
571 eap_aka_verify_checkcode(data, attr->checkcode,
572 attr->checkcode_len)) {
573 wpa_printf(MSG_WARNING, "EAP-AKA: Invalid AT_CHECKCODE in the "
574 "message");
575 return eap_aka_client_error(data, id,
576 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
577 }
578
579 data->reauth = 0;
580 if (!attr->mac || !attr->rand || !attr->autn) {
581 wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message "
582 "did not include%s%s%s",
583 !attr->mac ? " AT_MAC" : "",
584 !attr->rand ? " AT_RAND" : "",
585 !attr->autn ? " AT_AUTN" : "");
586 return eap_aka_client_error(data, id,
587 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
588 }
589 os_memcpy(data->rand, attr->rand, EAP_AKA_RAND_LEN);
590 os_memcpy(data->autn, attr->autn, EAP_AKA_AUTN_LEN);
591
592 res = eap_aka_umts_auth(sm, data);
593 if (res == -1) {
594 wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication "
595 "failed (AUTN)");
596 return eap_aka_authentication_reject(data, id);
597 } else if (res == -2) {
598 wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication "
599 "failed (AUTN seq# -> AUTS)");
600 return eap_aka_synchronization_failure(data, id);
601 } else if (res) {
602 wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication failed");
603 return eap_aka_client_error(data, id,
604 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
605 }
606 if (data->last_eap_identity) {
607 identity = data->last_eap_identity;
608 identity_len = data->last_eap_identity_len;
609 } else if (data->pseudonym) {
610 identity = data->pseudonym;
611 identity_len = data->pseudonym_len;
612 } else
613 identity = eap_get_config_identity(sm, &identity_len);
614 wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA: Selected identity for MK "
615 "derivation", identity, identity_len);
616 eap_aka_derive_mk(identity, identity_len, data->ik, data->ck,
617 data->mk);
618 eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut, data->msk,
619 data->emsk);
620 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
621 {
622 wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message "
623 "used invalid AT_MAC");
624 return eap_aka_client_error(data, id,
625 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
626 }
627
628 /* Old reauthentication and pseudonym identities must not be used
629 * anymore. In other words, if no new identities are received, full
630 * authentication will be used on next reauthentication. */
631 eap_aka_clear_identities(data, CLEAR_PSEUDONYM | CLEAR_REAUTH_ID |
632 CLEAR_EAP_ID);
633
634 if (attr->encr_data) {
635 u8 *decrypted;
636 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
637 attr->encr_data_len, attr->iv,
638 &eattr, 0);
639 if (decrypted == NULL) {
640 return eap_aka_client_error(
641 data, id, EAP_AKA_UNABLE_TO_PROCESS_PACKET);
642 }
643 eap_aka_learn_ids(data, &eattr);
644 os_free(decrypted);
645 }
646
647 if (data->result_ind && attr->result_ind)
648 data->use_result_ind = 1;
649
650 if (data->state != FAILURE && data->state != RESULT_FAILURE) {
651 eap_aka_state(data, data->use_result_ind ?
652 RESULT_SUCCESS : SUCCESS);
653 }
654
655 data->num_id_req = 0;
656 data->num_notification = 0;
657 /* RFC 4187 specifies that counter is initialized to one after
658 * fullauth, but initializing it to zero makes it easier to implement
659 * reauth verification. */
660 data->counter = 0;
661 return eap_aka_response_challenge(data, id);
662 }
663
664
665 static int eap_aka_process_notification_reauth(struct eap_aka_data *data,
666 struct eap_sim_attrs *attr)
667 {
668 struct eap_sim_attrs eattr;
669 u8 *decrypted;
670
671 if (attr->encr_data == NULL || attr->iv == NULL) {
672 wpa_printf(MSG_WARNING, "EAP-AKA: Notification message after "
673 "reauth did not include encrypted data");
674 return -1;
675 }
676
677 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
678 attr->encr_data_len, attr->iv, &eattr,
679 0);
680 if (decrypted == NULL) {
681 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to parse encrypted "
682 "data from notification message");
683 return -1;
684 }
685
686 if (eattr.counter < 0 || (size_t) eattr.counter != data->counter) {
687 wpa_printf(MSG_WARNING, "EAP-AKA: Counter in notification "
688 "message does not match with counter in reauth "
689 "message");
690 os_free(decrypted);
691 return -1;
692 }
693
694 os_free(decrypted);
695 return 0;
696 }
697
698
699 static int eap_aka_process_notification_auth(struct eap_aka_data *data,
700 const struct wpabuf *reqData,
701 struct eap_sim_attrs *attr)
702 {
703 if (attr->mac == NULL) {
704 wpa_printf(MSG_INFO, "EAP-AKA: no AT_MAC in after_auth "
705 "Notification message");
706 return -1;
707 }
708
709 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
710 {
711 wpa_printf(MSG_WARNING, "EAP-AKA: Notification message "
712 "used invalid AT_MAC");
713 return -1;
714 }
715
716 if (data->reauth &&
717 eap_aka_process_notification_reauth(data, attr)) {
718 wpa_printf(MSG_WARNING, "EAP-AKA: Invalid notification "
719 "message after reauth");
720 return -1;
721 }
722
723 return 0;
724 }
725
726
727 static struct wpabuf * eap_aka_process_notification(
728 struct eap_sm *sm, struct eap_aka_data *data, u8 id,
729 const struct wpabuf *reqData, struct eap_sim_attrs *attr)
730 {
731 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Notification");
732 if (data->num_notification > 0) {
733 wpa_printf(MSG_INFO, "EAP-AKA: too many notification "
734 "rounds (only one allowed)");
735 return eap_aka_client_error(data, id,
736 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
737 }
738 data->num_notification++;
739 if (attr->notification == -1) {
740 wpa_printf(MSG_INFO, "EAP-AKA: no AT_NOTIFICATION in "
741 "Notification message");
742 return eap_aka_client_error(data, id,
743 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
744 }
745
746 if ((attr->notification & 0x4000) == 0 &&
747 eap_aka_process_notification_auth(data, reqData, attr)) {
748 return eap_aka_client_error(data, id,
749 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
750 }
751
752 eap_sim_report_notification(sm->msg_ctx, attr->notification, 1);
753 if (attr->notification >= 0 && attr->notification < 32768) {
754 eap_aka_state(data, FAILURE);
755 } else if (attr->notification == EAP_SIM_SUCCESS &&
756 data->state == RESULT_SUCCESS)
757 eap_aka_state(data, SUCCESS);
758 return eap_aka_response_notification(data, id, attr->notification);
759 }
760
761
762 static struct wpabuf * eap_aka_process_reauthentication(
763 struct eap_sm *sm, struct eap_aka_data *data, u8 id,
764 const struct wpabuf *reqData, struct eap_sim_attrs *attr)
765 {
766 struct eap_sim_attrs eattr;
767 u8 *decrypted;
768
769 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Reauthentication");
770
771 if (attr->checkcode &&
772 eap_aka_verify_checkcode(data, attr->checkcode,
773 attr->checkcode_len)) {
774 wpa_printf(MSG_WARNING, "EAP-AKA: Invalid AT_CHECKCODE in the "
775 "message");
776 return eap_aka_client_error(data, id,
777 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
778 }
779
780 if (data->reauth_id == NULL) {
781 wpa_printf(MSG_WARNING, "EAP-AKA: Server is trying "
782 "reauthentication, but no reauth_id available");
783 return eap_aka_client_error(data, id,
784 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
785 }
786
787 data->reauth = 1;
788 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
789 {
790 wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication "
791 "did not have valid AT_MAC");
792 return eap_aka_client_error(data, id,
793 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
794 }
795
796 if (attr->encr_data == NULL || attr->iv == NULL) {
797 wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication "
798 "message did not include encrypted data");
799 return eap_aka_client_error(data, id,
800 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
801 }
802
803 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
804 attr->encr_data_len, attr->iv, &eattr,
805 0);
806 if (decrypted == NULL) {
807 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to parse encrypted "
808 "data from reauthentication message");
809 return eap_aka_client_error(data, id,
810 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
811 }
812
813 if (eattr.nonce_s == NULL || eattr.counter < 0) {
814 wpa_printf(MSG_INFO, "EAP-AKA: (encr) No%s%s in reauth packet",
815 !eattr.nonce_s ? " AT_NONCE_S" : "",
816 eattr.counter < 0 ? " AT_COUNTER" : "");
817 os_free(decrypted);
818 return eap_aka_client_error(data, id,
819 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
820 }
821
822 if (eattr.counter < 0 || (size_t) eattr.counter <= data->counter) {
823 struct wpabuf *res;
824 wpa_printf(MSG_INFO, "EAP-AKA: (encr) Invalid counter "
825 "(%d <= %d)", eattr.counter, data->counter);
826 data->counter_too_small = eattr.counter;
827
828 eap_sim_derive_keys_reauth(eattr.counter, data->reauth_id,
829 data->reauth_id_len, eattr.nonce_s,
830 data->mk, NULL, NULL);
831
832 /* Reply using Re-auth w/ AT_COUNTER_TOO_SMALL. The current
833 * reauth_id must not be used to start a new reauthentication.
834 * However, since it was used in the last EAP-Response-Identity
835 * packet, it has to saved for the following fullauth to be
836 * used in MK derivation. */
837 os_free(data->last_eap_identity);
838 data->last_eap_identity = data->reauth_id;
839 data->last_eap_identity_len = data->reauth_id_len;
840 data->reauth_id = NULL;
841 data->reauth_id_len = 0;
842
843 res = eap_aka_response_reauth(data, id, 1, eattr.nonce_s);
844 os_free(decrypted);
845
846 return res;
847 }
848 data->counter = eattr.counter;
849
850 os_memcpy(data->nonce_s, eattr.nonce_s, EAP_SIM_NONCE_S_LEN);
851 wpa_hexdump(MSG_DEBUG, "EAP-AKA: (encr) AT_NONCE_S",
852 data->nonce_s, EAP_SIM_NONCE_S_LEN);
853
854 eap_sim_derive_keys_reauth(data->counter,
855 data->reauth_id, data->reauth_id_len,
856 data->nonce_s, data->mk, data->msk,
857 data->emsk);
858 eap_aka_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
859 eap_aka_learn_ids(data, &eattr);
860
861 if (data->result_ind && attr->result_ind)
862 data->use_result_ind = 1;
863
864 if (data->state != FAILURE && data->state != RESULT_FAILURE) {
865 eap_aka_state(data, data->use_result_ind ?
866 RESULT_SUCCESS : SUCCESS);
867 }
868
869 data->num_id_req = 0;
870 data->num_notification = 0;
871 if (data->counter > EAP_AKA_MAX_FAST_REAUTHS) {
872 wpa_printf(MSG_DEBUG, "EAP-AKA: Maximum number of "
873 "fast reauths performed - force fullauth");
874 eap_aka_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
875 }
876 os_free(decrypted);
877 return eap_aka_response_reauth(data, id, 0, data->nonce_s);
878 }
879
880
881 static struct wpabuf * eap_aka_process(struct eap_sm *sm, void *priv,
882 struct eap_method_ret *ret,
883 const struct wpabuf *reqData)
884 {
885 struct eap_aka_data *data = priv;
886 const struct eap_hdr *req;
887 u8 subtype, id;
888 struct wpabuf *res;
889 const u8 *pos;
890 struct eap_sim_attrs attr;
891 size_t len;
892
893 wpa_hexdump_buf(MSG_DEBUG, "EAP-AKA: EAP data", reqData);
894 if (eap_get_config_identity(sm, &len) == NULL) {
895 wpa_printf(MSG_INFO, "EAP-AKA: Identity not configured");
896 eap_sm_request_identity(sm);
897 ret->ignore = TRUE;
898 return NULL;
899 }
900
901 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_AKA, reqData, &len);
902 if (pos == NULL || len < 1) {
903 ret->ignore = TRUE;
904 return NULL;
905 }
906 req = wpabuf_head(reqData);
907 id = req->identifier;
908 len = be_to_host16(req->length);
909
910 ret->ignore = FALSE;
911 ret->methodState = METHOD_MAY_CONT;
912 ret->decision = DECISION_FAIL;
913 ret->allowNotifications = TRUE;
914
915 subtype = *pos++;
916 wpa_printf(MSG_DEBUG, "EAP-AKA: Subtype=%d", subtype);
917 pos += 2; /* Reserved */
918
919 if (eap_sim_parse_attr(pos, wpabuf_head_u8(reqData) + len, &attr, 1,
920 0)) {
921 res = eap_aka_client_error(data, id,
922 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
923 goto done;
924 }
925
926 switch (subtype) {
927 case EAP_AKA_SUBTYPE_IDENTITY:
928 res = eap_aka_process_identity(sm, data, id, reqData, &attr);
929 break;
930 case EAP_AKA_SUBTYPE_CHALLENGE:
931 res = eap_aka_process_challenge(sm, data, id, reqData, &attr);
932 break;
933 case EAP_AKA_SUBTYPE_NOTIFICATION:
934 res = eap_aka_process_notification(sm, data, id, reqData,
935 &attr);
936 break;
937 case EAP_AKA_SUBTYPE_REAUTHENTICATION:
938 res = eap_aka_process_reauthentication(sm, data, id, reqData,
939 &attr);
940 break;
941 case EAP_AKA_SUBTYPE_CLIENT_ERROR:
942 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Client-Error");
943 res = eap_aka_client_error(data, id,
944 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
945 break;
946 default:
947 wpa_printf(MSG_DEBUG, "EAP-AKA: Unknown subtype=%d", subtype);
948 res = eap_aka_client_error(data, id,
949 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
950 break;
951 }
952
953 done:
954 if (data->state == FAILURE) {
955 ret->decision = DECISION_FAIL;
956 ret->methodState = METHOD_DONE;
957 } else if (data->state == SUCCESS) {
958 ret->decision = data->use_result_ind ?
959 DECISION_UNCOND_SUCC : DECISION_COND_SUCC;
960 /*
961 * It is possible for the server to reply with AKA
962 * Notification, so we must allow the method to continue and
963 * not only accept EAP-Success at this point.
964 */
965 ret->methodState = data->use_result_ind ?
966 METHOD_DONE : METHOD_MAY_CONT;
967 } else if (data->state == RESULT_FAILURE)
968 ret->methodState = METHOD_CONT;
969 else if (data->state == RESULT_SUCCESS)
970 ret->methodState = METHOD_CONT;
971
972 if (ret->methodState == METHOD_DONE) {
973 ret->allowNotifications = FALSE;
974 }
975
976 return res;
977 }
978
979
980 static Boolean eap_aka_has_reauth_data(struct eap_sm *sm, void *priv)
981 {
982 struct eap_aka_data *data = priv;
983 return data->pseudonym || data->reauth_id;
984 }
985
986
987 static void eap_aka_deinit_for_reauth(struct eap_sm *sm, void *priv)
988 {
989 struct eap_aka_data *data = priv;
990 eap_aka_clear_identities(data, CLEAR_EAP_ID);
991 data->prev_id = -1;
992 wpabuf_free(data->id_msgs);
993 data->id_msgs = NULL;
994 data->use_result_ind = 0;
995 }
996
997
998 static void * eap_aka_init_for_reauth(struct eap_sm *sm, void *priv)
999 {
1000 struct eap_aka_data *data = priv;
1001 data->num_id_req = 0;
1002 data->num_notification = 0;
1003 eap_aka_state(data, CONTINUE);
1004 return priv;
1005 }
1006
1007
1008 static const u8 * eap_aka_get_identity(struct eap_sm *sm, void *priv,
1009 size_t *len)
1010 {
1011 struct eap_aka_data *data = priv;
1012
1013 if (data->reauth_id) {
1014 *len = data->reauth_id_len;
1015 return data->reauth_id;
1016 }
1017
1018 if (data->pseudonym) {
1019 *len = data->pseudonym_len;
1020 return data->pseudonym;
1021 }
1022
1023 return NULL;
1024 }
1025
1026
1027 static Boolean eap_aka_isKeyAvailable(struct eap_sm *sm, void *priv)
1028 {
1029 struct eap_aka_data *data = priv;
1030 return data->state == SUCCESS;
1031 }
1032
1033
1034 static u8 * eap_aka_getKey(struct eap_sm *sm, void *priv, size_t *len)
1035 {
1036 struct eap_aka_data *data = priv;
1037 u8 *key;
1038
1039 if (data->state != SUCCESS)
1040 return NULL;
1041
1042 key = os_malloc(EAP_SIM_KEYING_DATA_LEN);
1043 if (key == NULL)
1044 return NULL;
1045
1046 *len = EAP_SIM_KEYING_DATA_LEN;
1047 os_memcpy(key, data->msk, EAP_SIM_KEYING_DATA_LEN);
1048
1049 return key;
1050 }
1051
1052
1053 static u8 * eap_aka_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1054 {
1055 struct eap_aka_data *data = priv;
1056 u8 *key;
1057
1058 if (data->state != SUCCESS)
1059 return NULL;
1060
1061 key = os_malloc(EAP_EMSK_LEN);
1062 if (key == NULL)
1063 return NULL;
1064
1065 *len = EAP_EMSK_LEN;
1066 os_memcpy(key, data->emsk, EAP_EMSK_LEN);
1067
1068 return key;
1069 }
1070
1071
1072 int eap_peer_aka_register(void)
1073 {
1074 struct eap_method *eap;
1075 int ret;
1076
1077 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1078 EAP_VENDOR_IETF, EAP_TYPE_AKA, "AKA");
1079 if (eap == NULL)
1080 return -1;
1081
1082 eap->init = eap_aka_init;
1083 eap->deinit = eap_aka_deinit;
1084 eap->process = eap_aka_process;
1085 eap->isKeyAvailable = eap_aka_isKeyAvailable;
1086 eap->getKey = eap_aka_getKey;
1087 eap->has_reauth_data = eap_aka_has_reauth_data;
1088 eap->deinit_for_reauth = eap_aka_deinit_for_reauth;
1089 eap->init_for_reauth = eap_aka_init_for_reauth;
1090 eap->get_identity = eap_aka_get_identity;
1091 eap->get_emsk = eap_aka_get_emsk;
1092
1093 ret = eap_peer_method_register(eap);
1094 if (ret)
1095 eap_peer_method_free(eap);
1096 return ret;
1097 }
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