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EAP-AKA': Update to RFC 5448
[thirdparty/hostap.git] / src / eap_peer / eap_aka.c
1 /*
2 * EAP peer method: EAP-AKA (RFC 4187) and EAP-AKA' (RFC 5448)
3 * Copyright (c) 2004-2012, Jouni Malinen <j@w1.fi>
4 *
5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
7 */
8
9 #include "includes.h"
10
11 #include "common.h"
12 #include "pcsc_funcs.h"
13 #include "crypto/crypto.h"
14 #include "crypto/sha1.h"
15 #include "crypto/sha256.h"
16 #include "crypto/milenage.h"
17 #include "eap_common/eap_sim_common.h"
18 #include "eap_config.h"
19 #include "eap_i.h"
20
21
22 struct eap_aka_data {
23 u8 ik[EAP_AKA_IK_LEN], ck[EAP_AKA_CK_LEN], res[EAP_AKA_RES_MAX_LEN];
24 size_t res_len;
25 u8 nonce_s[EAP_SIM_NONCE_S_LEN];
26 u8 mk[EAP_SIM_MK_LEN];
27 u8 k_aut[EAP_AKA_PRIME_K_AUT_LEN];
28 u8 k_encr[EAP_SIM_K_ENCR_LEN];
29 u8 k_re[EAP_AKA_PRIME_K_RE_LEN]; /* EAP-AKA' only */
30 u8 msk[EAP_SIM_KEYING_DATA_LEN];
31 u8 emsk[EAP_EMSK_LEN];
32 u8 rand[EAP_AKA_RAND_LEN], autn[EAP_AKA_AUTN_LEN];
33 u8 auts[EAP_AKA_AUTS_LEN];
34
35 int num_id_req, num_notification;
36 u8 *pseudonym;
37 size_t pseudonym_len;
38 u8 *reauth_id;
39 size_t reauth_id_len;
40 int reauth;
41 unsigned int counter, counter_too_small;
42 u8 *last_eap_identity;
43 size_t last_eap_identity_len;
44 enum {
45 CONTINUE, RESULT_SUCCESS, RESULT_FAILURE, SUCCESS, FAILURE
46 } state;
47
48 struct wpabuf *id_msgs;
49 int prev_id;
50 int result_ind, use_result_ind;
51 u8 eap_method;
52 u8 *network_name;
53 size_t network_name_len;
54 u16 kdf;
55 int kdf_negotiation;
56 };
57
58
59 #ifndef CONFIG_NO_STDOUT_DEBUG
60 static const char * eap_aka_state_txt(int state)
61 {
62 switch (state) {
63 case CONTINUE:
64 return "CONTINUE";
65 case RESULT_SUCCESS:
66 return "RESULT_SUCCESS";
67 case RESULT_FAILURE:
68 return "RESULT_FAILURE";
69 case SUCCESS:
70 return "SUCCESS";
71 case FAILURE:
72 return "FAILURE";
73 default:
74 return "?";
75 }
76 }
77 #endif /* CONFIG_NO_STDOUT_DEBUG */
78
79
80 static void eap_aka_state(struct eap_aka_data *data, int state)
81 {
82 wpa_printf(MSG_DEBUG, "EAP-AKA: %s -> %s",
83 eap_aka_state_txt(data->state),
84 eap_aka_state_txt(state));
85 data->state = state;
86 }
87
88
89 static void * eap_aka_init(struct eap_sm *sm)
90 {
91 struct eap_aka_data *data;
92 const char *phase1 = eap_get_config_phase1(sm);
93
94 data = os_zalloc(sizeof(*data));
95 if (data == NULL)
96 return NULL;
97
98 data->eap_method = EAP_TYPE_AKA;
99
100 eap_aka_state(data, CONTINUE);
101 data->prev_id = -1;
102
103 data->result_ind = phase1 && os_strstr(phase1, "result_ind=1") != NULL;
104
105 return data;
106 }
107
108
109 #ifdef EAP_AKA_PRIME
110 static void * eap_aka_prime_init(struct eap_sm *sm)
111 {
112 struct eap_aka_data *data = eap_aka_init(sm);
113 if (data == NULL)
114 return NULL;
115 data->eap_method = EAP_TYPE_AKA_PRIME;
116 return data;
117 }
118 #endif /* EAP_AKA_PRIME */
119
120
121 static void eap_aka_deinit(struct eap_sm *sm, void *priv)
122 {
123 struct eap_aka_data *data = priv;
124 if (data) {
125 os_free(data->pseudonym);
126 os_free(data->reauth_id);
127 os_free(data->last_eap_identity);
128 wpabuf_free(data->id_msgs);
129 os_free(data->network_name);
130 os_free(data);
131 }
132 }
133
134
135 static int eap_aka_umts_auth(struct eap_sm *sm, struct eap_aka_data *data)
136 {
137 struct eap_peer_config *conf;
138
139 wpa_printf(MSG_DEBUG, "EAP-AKA: UMTS authentication algorithm");
140
141 conf = eap_get_config(sm);
142 if (conf == NULL)
143 return -1;
144 if (conf->pcsc) {
145 return scard_umts_auth(sm->scard_ctx, data->rand,
146 data->autn, data->res, &data->res_len,
147 data->ik, data->ck, data->auts);
148 }
149
150 #ifdef CONFIG_USIM_SIMULATOR
151 if (conf->password) {
152 u8 opc[16], k[16], sqn[6];
153 const char *pos;
154 wpa_printf(MSG_DEBUG, "EAP-AKA: Use internal Milenage "
155 "implementation for UMTS authentication");
156 if (conf->password_len < 78) {
157 wpa_printf(MSG_DEBUG, "EAP-AKA: invalid Milenage "
158 "password");
159 return -1;
160 }
161 pos = (const char *) conf->password;
162 if (hexstr2bin(pos, k, 16))
163 return -1;
164 pos += 32;
165 if (*pos != ':')
166 return -1;
167 pos++;
168
169 if (hexstr2bin(pos, opc, 16))
170 return -1;
171 pos += 32;
172 if (*pos != ':')
173 return -1;
174 pos++;
175
176 if (hexstr2bin(pos, sqn, 6))
177 return -1;
178
179 return milenage_check(opc, k, sqn, data->rand, data->autn,
180 data->ik, data->ck,
181 data->res, &data->res_len, data->auts);
182 }
183 #endif /* CONFIG_USIM_SIMULATOR */
184
185 #ifdef CONFIG_USIM_HARDCODED
186 wpa_printf(MSG_DEBUG, "EAP-AKA: Use hardcoded Kc and SRES values for "
187 "testing");
188
189 /* These hardcoded Kc and SRES values are used for testing.
190 * Could consider making them configurable. */
191 os_memset(data->res, '2', EAP_AKA_RES_MAX_LEN);
192 data->res_len = EAP_AKA_RES_MAX_LEN;
193 os_memset(data->ik, '3', EAP_AKA_IK_LEN);
194 os_memset(data->ck, '4', EAP_AKA_CK_LEN);
195 {
196 u8 autn[EAP_AKA_AUTN_LEN];
197 os_memset(autn, '1', EAP_AKA_AUTN_LEN);
198 if (os_memcmp(autn, data->autn, EAP_AKA_AUTN_LEN) != 0) {
199 wpa_printf(MSG_WARNING, "EAP-AKA: AUTN did not match "
200 "with expected value");
201 return -1;
202 }
203 }
204 #if 0
205 {
206 static int test_resync = 1;
207 if (test_resync) {
208 /* Test Resynchronization */
209 test_resync = 0;
210 return -2;
211 }
212 }
213 #endif
214 return 0;
215
216 #else /* CONFIG_USIM_HARDCODED */
217
218 wpa_printf(MSG_DEBUG, "EAP-AKA: No UMTS authentication algorith "
219 "enabled");
220 return -1;
221
222 #endif /* CONFIG_USIM_HARDCODED */
223 }
224
225
226 #define CLEAR_PSEUDONYM 0x01
227 #define CLEAR_REAUTH_ID 0x02
228 #define CLEAR_EAP_ID 0x04
229
230 static void eap_aka_clear_identities(struct eap_aka_data *data, int id)
231 {
232 if ((id & CLEAR_PSEUDONYM) && data->pseudonym) {
233 wpa_printf(MSG_DEBUG, "EAP-AKA: forgetting old pseudonym");
234 os_free(data->pseudonym);
235 data->pseudonym = NULL;
236 data->pseudonym_len = 0;
237 }
238 if ((id & CLEAR_REAUTH_ID) && data->reauth_id) {
239 wpa_printf(MSG_DEBUG, "EAP-AKA: forgetting old reauth_id");
240 os_free(data->reauth_id);
241 data->reauth_id = NULL;
242 data->reauth_id_len = 0;
243 }
244 if ((id & CLEAR_EAP_ID) && data->last_eap_identity) {
245 wpa_printf(MSG_DEBUG, "EAP-AKA: forgetting old eap_id");
246 os_free(data->last_eap_identity);
247 data->last_eap_identity = NULL;
248 data->last_eap_identity_len = 0;
249 }
250 }
251
252
253 static int eap_aka_learn_ids(struct eap_sm *sm, struct eap_aka_data *data,
254 struct eap_sim_attrs *attr)
255 {
256 if (attr->next_pseudonym) {
257 const u8 *identity = NULL;
258 size_t identity_len = 0;
259 const u8 *realm = NULL;
260 size_t realm_len = 0;
261
262 wpa_hexdump_ascii(MSG_DEBUG,
263 "EAP-AKA: (encr) AT_NEXT_PSEUDONYM",
264 attr->next_pseudonym,
265 attr->next_pseudonym_len);
266 os_free(data->pseudonym);
267 /* Look for the realm of the permanent identity */
268 identity = eap_get_config_identity(sm, &identity_len);
269 if (identity) {
270 for (realm = identity, realm_len = identity_len;
271 realm_len > 0; realm_len--, realm++) {
272 if (*realm == '@')
273 break;
274 }
275 }
276 data->pseudonym = os_malloc(attr->next_pseudonym_len +
277 realm_len);
278 if (data->pseudonym == NULL) {
279 wpa_printf(MSG_INFO, "EAP-AKA: (encr) No memory for "
280 "next pseudonym");
281 data->pseudonym_len = 0;
282 return -1;
283 }
284 os_memcpy(data->pseudonym, attr->next_pseudonym,
285 attr->next_pseudonym_len);
286 if (realm_len) {
287 os_memcpy(data->pseudonym + attr->next_pseudonym_len,
288 realm, realm_len);
289 }
290 data->pseudonym_len = attr->next_pseudonym_len + realm_len;
291 }
292
293 if (attr->next_reauth_id) {
294 os_free(data->reauth_id);
295 data->reauth_id = os_malloc(attr->next_reauth_id_len);
296 if (data->reauth_id == NULL) {
297 wpa_printf(MSG_INFO, "EAP-AKA: (encr) No memory for "
298 "next reauth_id");
299 data->reauth_id_len = 0;
300 return -1;
301 }
302 os_memcpy(data->reauth_id, attr->next_reauth_id,
303 attr->next_reauth_id_len);
304 data->reauth_id_len = attr->next_reauth_id_len;
305 wpa_hexdump_ascii(MSG_DEBUG,
306 "EAP-AKA: (encr) AT_NEXT_REAUTH_ID",
307 data->reauth_id,
308 data->reauth_id_len);
309 }
310
311 return 0;
312 }
313
314
315 static int eap_aka_add_id_msg(struct eap_aka_data *data,
316 const struct wpabuf *msg)
317 {
318 if (msg == NULL)
319 return -1;
320
321 if (data->id_msgs == NULL) {
322 data->id_msgs = wpabuf_dup(msg);
323 return data->id_msgs == NULL ? -1 : 0;
324 }
325
326 if (wpabuf_resize(&data->id_msgs, wpabuf_len(msg)) < 0)
327 return -1;
328 wpabuf_put_buf(data->id_msgs, msg);
329
330 return 0;
331 }
332
333
334 static void eap_aka_add_checkcode(struct eap_aka_data *data,
335 struct eap_sim_msg *msg)
336 {
337 const u8 *addr;
338 size_t len;
339 u8 hash[SHA256_MAC_LEN];
340
341 wpa_printf(MSG_DEBUG, " AT_CHECKCODE");
342
343 if (data->id_msgs == NULL) {
344 /*
345 * No EAP-AKA/Identity packets were exchanged - send empty
346 * checkcode.
347 */
348 eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, NULL, 0);
349 return;
350 }
351
352 /* Checkcode is SHA1/SHA256 hash over all EAP-AKA/Identity packets. */
353 addr = wpabuf_head(data->id_msgs);
354 len = wpabuf_len(data->id_msgs);
355 wpa_hexdump(MSG_MSGDUMP, "EAP-AKA: AT_CHECKCODE data", addr, len);
356 #ifdef EAP_AKA_PRIME
357 if (data->eap_method == EAP_TYPE_AKA_PRIME)
358 sha256_vector(1, &addr, &len, hash);
359 else
360 #endif /* EAP_AKA_PRIME */
361 sha1_vector(1, &addr, &len, hash);
362
363 eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, hash,
364 data->eap_method == EAP_TYPE_AKA_PRIME ?
365 EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN);
366 }
367
368
369 static int eap_aka_verify_checkcode(struct eap_aka_data *data,
370 const u8 *checkcode, size_t checkcode_len)
371 {
372 const u8 *addr;
373 size_t len;
374 u8 hash[SHA256_MAC_LEN];
375 size_t hash_len;
376
377 if (checkcode == NULL)
378 return -1;
379
380 if (data->id_msgs == NULL) {
381 if (checkcode_len != 0) {
382 wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from server "
383 "indicates that AKA/Identity messages were "
384 "used, but they were not");
385 return -1;
386 }
387 return 0;
388 }
389
390 hash_len = data->eap_method == EAP_TYPE_AKA_PRIME ?
391 EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN;
392
393 if (checkcode_len != hash_len) {
394 wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from server "
395 "indicates that AKA/Identity message were not "
396 "used, but they were");
397 return -1;
398 }
399
400 /* Checkcode is SHA1/SHA256 hash over all EAP-AKA/Identity packets. */
401 addr = wpabuf_head(data->id_msgs);
402 len = wpabuf_len(data->id_msgs);
403 #ifdef EAP_AKA_PRIME
404 if (data->eap_method == EAP_TYPE_AKA_PRIME)
405 sha256_vector(1, &addr, &len, hash);
406 else
407 #endif /* EAP_AKA_PRIME */
408 sha1_vector(1, &addr, &len, hash);
409
410 if (os_memcmp(hash, checkcode, hash_len) != 0) {
411 wpa_printf(MSG_DEBUG, "EAP-AKA: Mismatch in AT_CHECKCODE");
412 return -1;
413 }
414
415 return 0;
416 }
417
418
419 static struct wpabuf * eap_aka_client_error(struct eap_aka_data *data, u8 id,
420 int err)
421 {
422 struct eap_sim_msg *msg;
423
424 eap_aka_state(data, FAILURE);
425 data->num_id_req = 0;
426 data->num_notification = 0;
427
428 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
429 EAP_AKA_SUBTYPE_CLIENT_ERROR);
430 eap_sim_msg_add(msg, EAP_SIM_AT_CLIENT_ERROR_CODE, err, NULL, 0);
431 return eap_sim_msg_finish(msg, NULL, NULL, 0);
432 }
433
434
435 static struct wpabuf * eap_aka_authentication_reject(struct eap_aka_data *data,
436 u8 id)
437 {
438 struct eap_sim_msg *msg;
439
440 eap_aka_state(data, FAILURE);
441 data->num_id_req = 0;
442 data->num_notification = 0;
443
444 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Authentication-Reject "
445 "(id=%d)", id);
446 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
447 EAP_AKA_SUBTYPE_AUTHENTICATION_REJECT);
448 return eap_sim_msg_finish(msg, NULL, NULL, 0);
449 }
450
451
452 static struct wpabuf * eap_aka_synchronization_failure(
453 struct eap_aka_data *data, u8 id)
454 {
455 struct eap_sim_msg *msg;
456
457 data->num_id_req = 0;
458 data->num_notification = 0;
459
460 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Synchronization-Failure "
461 "(id=%d)", id);
462 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
463 EAP_AKA_SUBTYPE_SYNCHRONIZATION_FAILURE);
464 wpa_printf(MSG_DEBUG, " AT_AUTS");
465 eap_sim_msg_add_full(msg, EAP_SIM_AT_AUTS, data->auts,
466 EAP_AKA_AUTS_LEN);
467 return eap_sim_msg_finish(msg, NULL, NULL, 0);
468 }
469
470
471 static struct wpabuf * eap_aka_response_identity(struct eap_sm *sm,
472 struct eap_aka_data *data,
473 u8 id,
474 enum eap_sim_id_req id_req)
475 {
476 const u8 *identity = NULL;
477 size_t identity_len = 0;
478 struct eap_sim_msg *msg;
479
480 data->reauth = 0;
481 if (id_req == ANY_ID && data->reauth_id) {
482 identity = data->reauth_id;
483 identity_len = data->reauth_id_len;
484 data->reauth = 1;
485 } else if ((id_req == ANY_ID || id_req == FULLAUTH_ID) &&
486 data->pseudonym) {
487 identity = data->pseudonym;
488 identity_len = data->pseudonym_len;
489 eap_aka_clear_identities(data, CLEAR_REAUTH_ID);
490 } else if (id_req != NO_ID_REQ) {
491 identity = eap_get_config_identity(sm, &identity_len);
492 if (identity) {
493 eap_aka_clear_identities(data, CLEAR_PSEUDONYM |
494 CLEAR_REAUTH_ID);
495 }
496 }
497 if (id_req != NO_ID_REQ)
498 eap_aka_clear_identities(data, CLEAR_EAP_ID);
499
500 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Identity (id=%d)", id);
501 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
502 EAP_AKA_SUBTYPE_IDENTITY);
503
504 if (identity) {
505 wpa_hexdump_ascii(MSG_DEBUG, " AT_IDENTITY",
506 identity, identity_len);
507 eap_sim_msg_add(msg, EAP_SIM_AT_IDENTITY, identity_len,
508 identity, identity_len);
509 }
510
511 return eap_sim_msg_finish(msg, NULL, NULL, 0);
512 }
513
514
515 static struct wpabuf * eap_aka_response_challenge(struct eap_aka_data *data,
516 u8 id)
517 {
518 struct eap_sim_msg *msg;
519
520 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Challenge (id=%d)", id);
521 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
522 EAP_AKA_SUBTYPE_CHALLENGE);
523 wpa_printf(MSG_DEBUG, " AT_RES");
524 eap_sim_msg_add(msg, EAP_SIM_AT_RES, data->res_len * 8,
525 data->res, data->res_len);
526 eap_aka_add_checkcode(data, msg);
527 if (data->use_result_ind) {
528 wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
529 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
530 }
531 wpa_printf(MSG_DEBUG, " AT_MAC");
532 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
533 return eap_sim_msg_finish(msg, data->k_aut, (u8 *) "", 0);
534 }
535
536
537 static struct wpabuf * eap_aka_response_reauth(struct eap_aka_data *data,
538 u8 id, int counter_too_small,
539 const u8 *nonce_s)
540 {
541 struct eap_sim_msg *msg;
542 unsigned int counter;
543
544 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Reauthentication (id=%d)",
545 id);
546 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
547 EAP_AKA_SUBTYPE_REAUTHENTICATION);
548 wpa_printf(MSG_DEBUG, " AT_IV");
549 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
550 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA);
551
552 if (counter_too_small) {
553 wpa_printf(MSG_DEBUG, " *AT_COUNTER_TOO_SMALL");
554 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER_TOO_SMALL, 0, NULL, 0);
555 counter = data->counter_too_small;
556 } else
557 counter = data->counter;
558
559 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", counter);
560 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0);
561
562 if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) {
563 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to encrypt "
564 "AT_ENCR_DATA");
565 eap_sim_msg_free(msg);
566 return NULL;
567 }
568 eap_aka_add_checkcode(data, msg);
569 if (data->use_result_ind) {
570 wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
571 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
572 }
573 wpa_printf(MSG_DEBUG, " AT_MAC");
574 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
575 return eap_sim_msg_finish(msg, data->k_aut, nonce_s,
576 EAP_SIM_NONCE_S_LEN);
577 }
578
579
580 static struct wpabuf * eap_aka_response_notification(struct eap_aka_data *data,
581 u8 id, u16 notification)
582 {
583 struct eap_sim_msg *msg;
584 u8 *k_aut = (notification & 0x4000) == 0 ? data->k_aut : NULL;
585
586 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Notification (id=%d)", id);
587 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
588 EAP_AKA_SUBTYPE_NOTIFICATION);
589 if (k_aut && data->reauth) {
590 wpa_printf(MSG_DEBUG, " AT_IV");
591 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
592 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV,
593 EAP_SIM_AT_ENCR_DATA);
594 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", data->counter);
595 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter,
596 NULL, 0);
597 if (eap_sim_msg_add_encr_end(msg, data->k_encr,
598 EAP_SIM_AT_PADDING)) {
599 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to encrypt "
600 "AT_ENCR_DATA");
601 eap_sim_msg_free(msg);
602 return NULL;
603 }
604 }
605 if (k_aut) {
606 wpa_printf(MSG_DEBUG, " AT_MAC");
607 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
608 }
609 return eap_sim_msg_finish(msg, k_aut, (u8 *) "", 0);
610 }
611
612
613 static struct wpabuf * eap_aka_process_identity(struct eap_sm *sm,
614 struct eap_aka_data *data,
615 u8 id,
616 const struct wpabuf *reqData,
617 struct eap_sim_attrs *attr)
618 {
619 int id_error;
620 struct wpabuf *buf;
621
622 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Identity");
623
624 id_error = 0;
625 switch (attr->id_req) {
626 case NO_ID_REQ:
627 break;
628 case ANY_ID:
629 if (data->num_id_req > 0)
630 id_error++;
631 data->num_id_req++;
632 break;
633 case FULLAUTH_ID:
634 if (data->num_id_req > 1)
635 id_error++;
636 data->num_id_req++;
637 break;
638 case PERMANENT_ID:
639 if (data->num_id_req > 2)
640 id_error++;
641 data->num_id_req++;
642 break;
643 }
644 if (id_error) {
645 wpa_printf(MSG_INFO, "EAP-AKA: Too many ID requests "
646 "used within one authentication");
647 return eap_aka_client_error(data, id,
648 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
649 }
650
651 buf = eap_aka_response_identity(sm, data, id, attr->id_req);
652
653 if (data->prev_id != id) {
654 eap_aka_add_id_msg(data, reqData);
655 eap_aka_add_id_msg(data, buf);
656 data->prev_id = id;
657 }
658
659 return buf;
660 }
661
662
663 static int eap_aka_verify_mac(struct eap_aka_data *data,
664 const struct wpabuf *req,
665 const u8 *mac, const u8 *extra,
666 size_t extra_len)
667 {
668 if (data->eap_method == EAP_TYPE_AKA_PRIME)
669 return eap_sim_verify_mac_sha256(data->k_aut, req, mac, extra,
670 extra_len);
671 return eap_sim_verify_mac(data->k_aut, req, mac, extra, extra_len);
672 }
673
674
675 #ifdef EAP_AKA_PRIME
676 static struct wpabuf * eap_aka_prime_kdf_select(struct eap_aka_data *data,
677 u8 id, u16 kdf)
678 {
679 struct eap_sim_msg *msg;
680
681 data->kdf_negotiation = 1;
682 data->kdf = kdf;
683 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Challenge (id=%d) (KDF "
684 "select)", id);
685 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
686 EAP_AKA_SUBTYPE_CHALLENGE);
687 wpa_printf(MSG_DEBUG, " AT_KDF");
688 eap_sim_msg_add(msg, EAP_SIM_AT_KDF, kdf, NULL, 0);
689 return eap_sim_msg_finish(msg, NULL, NULL, 0);
690 }
691
692
693 static struct wpabuf * eap_aka_prime_kdf_neg(struct eap_aka_data *data,
694 u8 id, struct eap_sim_attrs *attr)
695 {
696 size_t i;
697
698 for (i = 0; i < attr->kdf_count; i++) {
699 if (attr->kdf[i] == EAP_AKA_PRIME_KDF)
700 return eap_aka_prime_kdf_select(data, id,
701 EAP_AKA_PRIME_KDF);
702 }
703
704 /* No matching KDF found - fail authentication as if AUTN had been
705 * incorrect */
706 return eap_aka_authentication_reject(data, id);
707 }
708
709
710 static int eap_aka_prime_kdf_valid(struct eap_aka_data *data,
711 struct eap_sim_attrs *attr)
712 {
713 size_t i, j;
714
715 if (attr->kdf_count == 0)
716 return 0;
717
718 /* The only allowed (and required) duplication of a KDF is the addition
719 * of the selected KDF into the beginning of the list. */
720
721 if (data->kdf_negotiation) {
722 if (attr->kdf[0] != data->kdf) {
723 wpa_printf(MSG_WARNING, "EAP-AKA': The server did not "
724 "accept the selected KDF");
725 return 0;
726 }
727
728 for (i = 1; i < attr->kdf_count; i++) {
729 if (attr->kdf[i] == data->kdf)
730 break;
731 }
732 if (i == attr->kdf_count &&
733 attr->kdf_count < EAP_AKA_PRIME_KDF_MAX) {
734 wpa_printf(MSG_WARNING, "EAP-AKA': The server did not "
735 "duplicate the selected KDF");
736 return 0;
737 }
738
739 /* TODO: should check that the list is identical to the one
740 * used in the previous Challenge message apart from the added
741 * entry in the beginning. */
742 }
743
744 for (i = data->kdf ? 1 : 0; i < attr->kdf_count; i++) {
745 for (j = i + 1; j < attr->kdf_count; j++) {
746 if (attr->kdf[i] == attr->kdf[j]) {
747 wpa_printf(MSG_WARNING, "EAP-AKA': The server "
748 "included a duplicated KDF");
749 return 0;
750 }
751 }
752 }
753
754 return 1;
755 }
756 #endif /* EAP_AKA_PRIME */
757
758
759 static struct wpabuf * eap_aka_process_challenge(struct eap_sm *sm,
760 struct eap_aka_data *data,
761 u8 id,
762 const struct wpabuf *reqData,
763 struct eap_sim_attrs *attr)
764 {
765 const u8 *identity;
766 size_t identity_len;
767 int res;
768 struct eap_sim_attrs eattr;
769
770 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Challenge");
771
772 if (attr->checkcode &&
773 eap_aka_verify_checkcode(data, attr->checkcode,
774 attr->checkcode_len)) {
775 wpa_printf(MSG_WARNING, "EAP-AKA: Invalid AT_CHECKCODE in the "
776 "message");
777 return eap_aka_client_error(data, id,
778 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
779 }
780
781 #ifdef EAP_AKA_PRIME
782 if (data->eap_method == EAP_TYPE_AKA_PRIME) {
783 if (!attr->kdf_input || attr->kdf_input_len == 0) {
784 wpa_printf(MSG_WARNING, "EAP-AKA': Challenge message "
785 "did not include non-empty AT_KDF_INPUT");
786 /* Fail authentication as if AUTN had been incorrect */
787 return eap_aka_authentication_reject(data, id);
788 }
789 os_free(data->network_name);
790 data->network_name = os_malloc(attr->kdf_input_len);
791 if (data->network_name == NULL) {
792 wpa_printf(MSG_WARNING, "EAP-AKA': No memory for "
793 "storing Network Name");
794 return eap_aka_authentication_reject(data, id);
795 }
796 os_memcpy(data->network_name, attr->kdf_input,
797 attr->kdf_input_len);
798 data->network_name_len = attr->kdf_input_len;
799 wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA': Network Name "
800 "(AT_KDF_INPUT)",
801 data->network_name, data->network_name_len);
802 /* TODO: check Network Name per 3GPP.33.402 */
803
804 if (!eap_aka_prime_kdf_valid(data, attr))
805 return eap_aka_authentication_reject(data, id);
806
807 if (attr->kdf[0] != EAP_AKA_PRIME_KDF)
808 return eap_aka_prime_kdf_neg(data, id, attr);
809
810 data->kdf = EAP_AKA_PRIME_KDF;
811 wpa_printf(MSG_DEBUG, "EAP-AKA': KDF %d selected", data->kdf);
812 }
813
814 if (data->eap_method == EAP_TYPE_AKA && attr->bidding) {
815 u16 flags = WPA_GET_BE16(attr->bidding);
816 if ((flags & EAP_AKA_BIDDING_FLAG_D) &&
817 eap_allowed_method(sm, EAP_VENDOR_IETF,
818 EAP_TYPE_AKA_PRIME)) {
819 wpa_printf(MSG_WARNING, "EAP-AKA: Bidding down from "
820 "AKA' to AKA detected");
821 /* Fail authentication as if AUTN had been incorrect */
822 return eap_aka_authentication_reject(data, id);
823 }
824 }
825 #endif /* EAP_AKA_PRIME */
826
827 data->reauth = 0;
828 if (!attr->mac || !attr->rand || !attr->autn) {
829 wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message "
830 "did not include%s%s%s",
831 !attr->mac ? " AT_MAC" : "",
832 !attr->rand ? " AT_RAND" : "",
833 !attr->autn ? " AT_AUTN" : "");
834 return eap_aka_client_error(data, id,
835 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
836 }
837 os_memcpy(data->rand, attr->rand, EAP_AKA_RAND_LEN);
838 os_memcpy(data->autn, attr->autn, EAP_AKA_AUTN_LEN);
839
840 res = eap_aka_umts_auth(sm, data);
841 if (res == -1) {
842 wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication "
843 "failed (AUTN)");
844 return eap_aka_authentication_reject(data, id);
845 } else if (res == -2) {
846 wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication "
847 "failed (AUTN seq# -> AUTS)");
848 return eap_aka_synchronization_failure(data, id);
849 } else if (res) {
850 wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication failed");
851 return eap_aka_client_error(data, id,
852 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
853 }
854 #ifdef EAP_AKA_PRIME
855 if (data->eap_method == EAP_TYPE_AKA_PRIME) {
856 /* Note: AUTN = (SQN ^ AK) || AMF || MAC which gives us the
857 * needed 6-octet SQN ^ AK for CK',IK' derivation */
858 u16 amf = WPA_GET_BE16(data->autn + 6);
859 if (!(amf & 0x8000)) {
860 wpa_printf(MSG_WARNING, "EAP-AKA': AMF separation bit "
861 "not set (AMF=0x%4x)", amf);
862 return eap_aka_authentication_reject(data, id);
863 }
864 eap_aka_prime_derive_ck_ik_prime(data->ck, data->ik,
865 data->autn,
866 data->network_name,
867 data->network_name_len);
868 }
869 #endif /* EAP_AKA_PRIME */
870 if (data->last_eap_identity) {
871 identity = data->last_eap_identity;
872 identity_len = data->last_eap_identity_len;
873 } else if (data->pseudonym) {
874 identity = data->pseudonym;
875 identity_len = data->pseudonym_len;
876 } else
877 identity = eap_get_config_identity(sm, &identity_len);
878 wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA: Selected identity for MK "
879 "derivation", identity, identity_len);
880 if (data->eap_method == EAP_TYPE_AKA_PRIME) {
881 eap_aka_prime_derive_keys(identity, identity_len, data->ik,
882 data->ck, data->k_encr, data->k_aut,
883 data->k_re, data->msk, data->emsk);
884 } else {
885 eap_aka_derive_mk(identity, identity_len, data->ik, data->ck,
886 data->mk);
887 eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut,
888 data->msk, data->emsk);
889 }
890 if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
891 wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message "
892 "used invalid AT_MAC");
893 return eap_aka_client_error(data, id,
894 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
895 }
896
897 /* Old reauthentication identity must not be used anymore. In
898 * other words, if no new identities are received, full
899 * authentication will be used on next reauthentication (using
900 * pseudonym identity or permanent identity). */
901 eap_aka_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
902
903 if (attr->encr_data) {
904 u8 *decrypted;
905 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
906 attr->encr_data_len, attr->iv,
907 &eattr, 0);
908 if (decrypted == NULL) {
909 return eap_aka_client_error(
910 data, id, EAP_AKA_UNABLE_TO_PROCESS_PACKET);
911 }
912 eap_aka_learn_ids(sm, data, &eattr);
913 os_free(decrypted);
914 }
915
916 if (data->result_ind && attr->result_ind)
917 data->use_result_ind = 1;
918
919 if (data->state != FAILURE && data->state != RESULT_FAILURE) {
920 eap_aka_state(data, data->use_result_ind ?
921 RESULT_SUCCESS : SUCCESS);
922 }
923
924 data->num_id_req = 0;
925 data->num_notification = 0;
926 /* RFC 4187 specifies that counter is initialized to one after
927 * fullauth, but initializing it to zero makes it easier to implement
928 * reauth verification. */
929 data->counter = 0;
930 return eap_aka_response_challenge(data, id);
931 }
932
933
934 static int eap_aka_process_notification_reauth(struct eap_aka_data *data,
935 struct eap_sim_attrs *attr)
936 {
937 struct eap_sim_attrs eattr;
938 u8 *decrypted;
939
940 if (attr->encr_data == NULL || attr->iv == NULL) {
941 wpa_printf(MSG_WARNING, "EAP-AKA: Notification message after "
942 "reauth did not include encrypted data");
943 return -1;
944 }
945
946 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
947 attr->encr_data_len, attr->iv, &eattr,
948 0);
949 if (decrypted == NULL) {
950 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to parse encrypted "
951 "data from notification message");
952 return -1;
953 }
954
955 if (eattr.counter < 0 || (size_t) eattr.counter != data->counter) {
956 wpa_printf(MSG_WARNING, "EAP-AKA: Counter in notification "
957 "message does not match with counter in reauth "
958 "message");
959 os_free(decrypted);
960 return -1;
961 }
962
963 os_free(decrypted);
964 return 0;
965 }
966
967
968 static int eap_aka_process_notification_auth(struct eap_aka_data *data,
969 const struct wpabuf *reqData,
970 struct eap_sim_attrs *attr)
971 {
972 if (attr->mac == NULL) {
973 wpa_printf(MSG_INFO, "EAP-AKA: no AT_MAC in after_auth "
974 "Notification message");
975 return -1;
976 }
977
978 if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
979 wpa_printf(MSG_WARNING, "EAP-AKA: Notification message "
980 "used invalid AT_MAC");
981 return -1;
982 }
983
984 if (data->reauth &&
985 eap_aka_process_notification_reauth(data, attr)) {
986 wpa_printf(MSG_WARNING, "EAP-AKA: Invalid notification "
987 "message after reauth");
988 return -1;
989 }
990
991 return 0;
992 }
993
994
995 static struct wpabuf * eap_aka_process_notification(
996 struct eap_sm *sm, struct eap_aka_data *data, u8 id,
997 const struct wpabuf *reqData, struct eap_sim_attrs *attr)
998 {
999 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Notification");
1000 if (data->num_notification > 0) {
1001 wpa_printf(MSG_INFO, "EAP-AKA: too many notification "
1002 "rounds (only one allowed)");
1003 return eap_aka_client_error(data, id,
1004 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1005 }
1006 data->num_notification++;
1007 if (attr->notification == -1) {
1008 wpa_printf(MSG_INFO, "EAP-AKA: no AT_NOTIFICATION in "
1009 "Notification message");
1010 return eap_aka_client_error(data, id,
1011 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1012 }
1013
1014 if ((attr->notification & 0x4000) == 0 &&
1015 eap_aka_process_notification_auth(data, reqData, attr)) {
1016 return eap_aka_client_error(data, id,
1017 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1018 }
1019
1020 eap_sim_report_notification(sm->msg_ctx, attr->notification, 1);
1021 if (attr->notification >= 0 && attr->notification < 32768) {
1022 eap_aka_state(data, FAILURE);
1023 } else if (attr->notification == EAP_SIM_SUCCESS &&
1024 data->state == RESULT_SUCCESS)
1025 eap_aka_state(data, SUCCESS);
1026 return eap_aka_response_notification(data, id, attr->notification);
1027 }
1028
1029
1030 static struct wpabuf * eap_aka_process_reauthentication(
1031 struct eap_sm *sm, struct eap_aka_data *data, u8 id,
1032 const struct wpabuf *reqData, struct eap_sim_attrs *attr)
1033 {
1034 struct eap_sim_attrs eattr;
1035 u8 *decrypted;
1036
1037 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Reauthentication");
1038
1039 if (attr->checkcode &&
1040 eap_aka_verify_checkcode(data, attr->checkcode,
1041 attr->checkcode_len)) {
1042 wpa_printf(MSG_WARNING, "EAP-AKA: Invalid AT_CHECKCODE in the "
1043 "message");
1044 return eap_aka_client_error(data, id,
1045 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1046 }
1047
1048 if (data->reauth_id == NULL) {
1049 wpa_printf(MSG_WARNING, "EAP-AKA: Server is trying "
1050 "reauthentication, but no reauth_id available");
1051 return eap_aka_client_error(data, id,
1052 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1053 }
1054
1055 data->reauth = 1;
1056 if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
1057 wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication "
1058 "did not have valid AT_MAC");
1059 return eap_aka_client_error(data, id,
1060 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1061 }
1062
1063 if (attr->encr_data == NULL || attr->iv == NULL) {
1064 wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication "
1065 "message did not include encrypted data");
1066 return eap_aka_client_error(data, id,
1067 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1068 }
1069
1070 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
1071 attr->encr_data_len, attr->iv, &eattr,
1072 0);
1073 if (decrypted == NULL) {
1074 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to parse encrypted "
1075 "data from reauthentication message");
1076 return eap_aka_client_error(data, id,
1077 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1078 }
1079
1080 if (eattr.nonce_s == NULL || eattr.counter < 0) {
1081 wpa_printf(MSG_INFO, "EAP-AKA: (encr) No%s%s in reauth packet",
1082 !eattr.nonce_s ? " AT_NONCE_S" : "",
1083 eattr.counter < 0 ? " AT_COUNTER" : "");
1084 os_free(decrypted);
1085 return eap_aka_client_error(data, id,
1086 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1087 }
1088
1089 if (eattr.counter < 0 || (size_t) eattr.counter <= data->counter) {
1090 struct wpabuf *res;
1091 wpa_printf(MSG_INFO, "EAP-AKA: (encr) Invalid counter "
1092 "(%d <= %d)", eattr.counter, data->counter);
1093 data->counter_too_small = eattr.counter;
1094
1095 /* Reply using Re-auth w/ AT_COUNTER_TOO_SMALL. The current
1096 * reauth_id must not be used to start a new reauthentication.
1097 * However, since it was used in the last EAP-Response-Identity
1098 * packet, it has to saved for the following fullauth to be
1099 * used in MK derivation. */
1100 os_free(data->last_eap_identity);
1101 data->last_eap_identity = data->reauth_id;
1102 data->last_eap_identity_len = data->reauth_id_len;
1103 data->reauth_id = NULL;
1104 data->reauth_id_len = 0;
1105
1106 res = eap_aka_response_reauth(data, id, 1, eattr.nonce_s);
1107 os_free(decrypted);
1108
1109 return res;
1110 }
1111 data->counter = eattr.counter;
1112
1113 os_memcpy(data->nonce_s, eattr.nonce_s, EAP_SIM_NONCE_S_LEN);
1114 wpa_hexdump(MSG_DEBUG, "EAP-AKA: (encr) AT_NONCE_S",
1115 data->nonce_s, EAP_SIM_NONCE_S_LEN);
1116
1117 if (data->eap_method == EAP_TYPE_AKA_PRIME) {
1118 eap_aka_prime_derive_keys_reauth(data->k_re, data->counter,
1119 data->reauth_id,
1120 data->reauth_id_len,
1121 data->nonce_s,
1122 data->msk, data->emsk);
1123 } else {
1124 eap_sim_derive_keys_reauth(data->counter, data->reauth_id,
1125 data->reauth_id_len,
1126 data->nonce_s, data->mk,
1127 data->msk, data->emsk);
1128 }
1129 eap_aka_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
1130 eap_aka_learn_ids(sm, data, &eattr);
1131
1132 if (data->result_ind && attr->result_ind)
1133 data->use_result_ind = 1;
1134
1135 if (data->state != FAILURE && data->state != RESULT_FAILURE) {
1136 eap_aka_state(data, data->use_result_ind ?
1137 RESULT_SUCCESS : SUCCESS);
1138 }
1139
1140 data->num_id_req = 0;
1141 data->num_notification = 0;
1142 if (data->counter > EAP_AKA_MAX_FAST_REAUTHS) {
1143 wpa_printf(MSG_DEBUG, "EAP-AKA: Maximum number of "
1144 "fast reauths performed - force fullauth");
1145 eap_aka_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
1146 }
1147 os_free(decrypted);
1148 return eap_aka_response_reauth(data, id, 0, data->nonce_s);
1149 }
1150
1151
1152 static struct wpabuf * eap_aka_process(struct eap_sm *sm, void *priv,
1153 struct eap_method_ret *ret,
1154 const struct wpabuf *reqData)
1155 {
1156 struct eap_aka_data *data = priv;
1157 const struct eap_hdr *req;
1158 u8 subtype, id;
1159 struct wpabuf *res;
1160 const u8 *pos;
1161 struct eap_sim_attrs attr;
1162 size_t len;
1163
1164 wpa_hexdump_buf(MSG_DEBUG, "EAP-AKA: EAP data", reqData);
1165 if (eap_get_config_identity(sm, &len) == NULL) {
1166 wpa_printf(MSG_INFO, "EAP-AKA: Identity not configured");
1167 eap_sm_request_identity(sm);
1168 ret->ignore = TRUE;
1169 return NULL;
1170 }
1171
1172 pos = eap_hdr_validate(EAP_VENDOR_IETF, data->eap_method, reqData,
1173 &len);
1174 if (pos == NULL || len < 1) {
1175 ret->ignore = TRUE;
1176 return NULL;
1177 }
1178 req = wpabuf_head(reqData);
1179 id = req->identifier;
1180 len = be_to_host16(req->length);
1181
1182 ret->ignore = FALSE;
1183 ret->methodState = METHOD_MAY_CONT;
1184 ret->decision = DECISION_FAIL;
1185 ret->allowNotifications = TRUE;
1186
1187 subtype = *pos++;
1188 wpa_printf(MSG_DEBUG, "EAP-AKA: Subtype=%d", subtype);
1189 pos += 2; /* Reserved */
1190
1191 if (eap_sim_parse_attr(pos, wpabuf_head_u8(reqData) + len, &attr,
1192 data->eap_method == EAP_TYPE_AKA_PRIME ? 2 : 1,
1193 0)) {
1194 res = eap_aka_client_error(data, id,
1195 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1196 goto done;
1197 }
1198
1199 switch (subtype) {
1200 case EAP_AKA_SUBTYPE_IDENTITY:
1201 res = eap_aka_process_identity(sm, data, id, reqData, &attr);
1202 break;
1203 case EAP_AKA_SUBTYPE_CHALLENGE:
1204 res = eap_aka_process_challenge(sm, data, id, reqData, &attr);
1205 break;
1206 case EAP_AKA_SUBTYPE_NOTIFICATION:
1207 res = eap_aka_process_notification(sm, data, id, reqData,
1208 &attr);
1209 break;
1210 case EAP_AKA_SUBTYPE_REAUTHENTICATION:
1211 res = eap_aka_process_reauthentication(sm, data, id, reqData,
1212 &attr);
1213 break;
1214 case EAP_AKA_SUBTYPE_CLIENT_ERROR:
1215 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Client-Error");
1216 res = eap_aka_client_error(data, id,
1217 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1218 break;
1219 default:
1220 wpa_printf(MSG_DEBUG, "EAP-AKA: Unknown subtype=%d", subtype);
1221 res = eap_aka_client_error(data, id,
1222 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1223 break;
1224 }
1225
1226 done:
1227 if (data->state == FAILURE) {
1228 ret->decision = DECISION_FAIL;
1229 ret->methodState = METHOD_DONE;
1230 } else if (data->state == SUCCESS) {
1231 ret->decision = data->use_result_ind ?
1232 DECISION_UNCOND_SUCC : DECISION_COND_SUCC;
1233 /*
1234 * It is possible for the server to reply with AKA
1235 * Notification, so we must allow the method to continue and
1236 * not only accept EAP-Success at this point.
1237 */
1238 ret->methodState = data->use_result_ind ?
1239 METHOD_DONE : METHOD_MAY_CONT;
1240 } else if (data->state == RESULT_FAILURE)
1241 ret->methodState = METHOD_CONT;
1242 else if (data->state == RESULT_SUCCESS)
1243 ret->methodState = METHOD_CONT;
1244
1245 if (ret->methodState == METHOD_DONE) {
1246 ret->allowNotifications = FALSE;
1247 }
1248
1249 return res;
1250 }
1251
1252
1253 static Boolean eap_aka_has_reauth_data(struct eap_sm *sm, void *priv)
1254 {
1255 struct eap_aka_data *data = priv;
1256 return data->pseudonym || data->reauth_id;
1257 }
1258
1259
1260 static void eap_aka_deinit_for_reauth(struct eap_sm *sm, void *priv)
1261 {
1262 struct eap_aka_data *data = priv;
1263 eap_aka_clear_identities(data, CLEAR_EAP_ID);
1264 data->prev_id = -1;
1265 wpabuf_free(data->id_msgs);
1266 data->id_msgs = NULL;
1267 data->use_result_ind = 0;
1268 data->kdf_negotiation = 0;
1269 }
1270
1271
1272 static void * eap_aka_init_for_reauth(struct eap_sm *sm, void *priv)
1273 {
1274 struct eap_aka_data *data = priv;
1275 data->num_id_req = 0;
1276 data->num_notification = 0;
1277 eap_aka_state(data, CONTINUE);
1278 return priv;
1279 }
1280
1281
1282 static const u8 * eap_aka_get_identity(struct eap_sm *sm, void *priv,
1283 size_t *len)
1284 {
1285 struct eap_aka_data *data = priv;
1286
1287 if (data->reauth_id) {
1288 *len = data->reauth_id_len;
1289 return data->reauth_id;
1290 }
1291
1292 if (data->pseudonym) {
1293 *len = data->pseudonym_len;
1294 return data->pseudonym;
1295 }
1296
1297 return NULL;
1298 }
1299
1300
1301 static Boolean eap_aka_isKeyAvailable(struct eap_sm *sm, void *priv)
1302 {
1303 struct eap_aka_data *data = priv;
1304 return data->state == SUCCESS;
1305 }
1306
1307
1308 static u8 * eap_aka_getKey(struct eap_sm *sm, void *priv, size_t *len)
1309 {
1310 struct eap_aka_data *data = priv;
1311 u8 *key;
1312
1313 if (data->state != SUCCESS)
1314 return NULL;
1315
1316 key = os_malloc(EAP_SIM_KEYING_DATA_LEN);
1317 if (key == NULL)
1318 return NULL;
1319
1320 *len = EAP_SIM_KEYING_DATA_LEN;
1321 os_memcpy(key, data->msk, EAP_SIM_KEYING_DATA_LEN);
1322
1323 return key;
1324 }
1325
1326
1327 static u8 * eap_aka_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1328 {
1329 struct eap_aka_data *data = priv;
1330 u8 *key;
1331
1332 if (data->state != SUCCESS)
1333 return NULL;
1334
1335 key = os_malloc(EAP_EMSK_LEN);
1336 if (key == NULL)
1337 return NULL;
1338
1339 *len = EAP_EMSK_LEN;
1340 os_memcpy(key, data->emsk, EAP_EMSK_LEN);
1341
1342 return key;
1343 }
1344
1345
1346 int eap_peer_aka_register(void)
1347 {
1348 struct eap_method *eap;
1349 int ret;
1350
1351 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1352 EAP_VENDOR_IETF, EAP_TYPE_AKA, "AKA");
1353 if (eap == NULL)
1354 return -1;
1355
1356 eap->init = eap_aka_init;
1357 eap->deinit = eap_aka_deinit;
1358 eap->process = eap_aka_process;
1359 eap->isKeyAvailable = eap_aka_isKeyAvailable;
1360 eap->getKey = eap_aka_getKey;
1361 eap->has_reauth_data = eap_aka_has_reauth_data;
1362 eap->deinit_for_reauth = eap_aka_deinit_for_reauth;
1363 eap->init_for_reauth = eap_aka_init_for_reauth;
1364 eap->get_identity = eap_aka_get_identity;
1365 eap->get_emsk = eap_aka_get_emsk;
1366
1367 ret = eap_peer_method_register(eap);
1368 if (ret)
1369 eap_peer_method_free(eap);
1370 return ret;
1371 }
1372
1373
1374 #ifdef EAP_AKA_PRIME
1375 int eap_peer_aka_prime_register(void)
1376 {
1377 struct eap_method *eap;
1378 int ret;
1379
1380 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1381 EAP_VENDOR_IETF, EAP_TYPE_AKA_PRIME,
1382 "AKA'");
1383 if (eap == NULL)
1384 return -1;
1385
1386 eap->init = eap_aka_prime_init;
1387 eap->deinit = eap_aka_deinit;
1388 eap->process = eap_aka_process;
1389 eap->isKeyAvailable = eap_aka_isKeyAvailable;
1390 eap->getKey = eap_aka_getKey;
1391 eap->has_reauth_data = eap_aka_has_reauth_data;
1392 eap->deinit_for_reauth = eap_aka_deinit_for_reauth;
1393 eap->init_for_reauth = eap_aka_init_for_reauth;
1394 eap->get_identity = eap_aka_get_identity;
1395 eap->get_emsk = eap_aka_get_emsk;
1396
1397 ret = eap_peer_method_register(eap);
1398 if (ret)
1399 eap_peer_method_free(eap);
1400
1401 return ret;
1402 }
1403 #endif /* EAP_AKA_PRIME */
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