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[thirdparty/hostap.git] / src / eap_peer / eap_aka.c
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6fc6879b 1/*
a9d1364c
JM		 2 * EAP peer method: EAP-AKA (RFC 4187) and EAP-AKA' (draft-arkko-eap-aka-kdf)
3 * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
6fc6879b
JM		 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"
6fc6879b 18#include "pcsc_funcs.h"
03da66bd
JM		 19#include "crypto/crypto.h"
20#include "crypto/sha1.h"
21#include "crypto/sha256.h"
43df4cc2 22#include "crypto/milenage.h"
03da66bd
JM		 23#include "eap_common/eap_sim_common.h"
24#include "eap_config.h"
25#include "eap_i.h"
6fc6879b
JM		 26
27
28struct eap_aka_data {
29 u8 ik[EAP_AKA_IK_LEN], ck[EAP_AKA_CK_LEN], res[EAP_AKA_RES_MAX_LEN];
30 size_t res_len;
31 u8 nonce_s[EAP_SIM_NONCE_S_LEN];
32 u8 mk[EAP_SIM_MK_LEN];
a9d1364c 33 u8 k_aut[EAP_AKA_PRIME_K_AUT_LEN];
6fc6879b 34 u8 k_encr[EAP_SIM_K_ENCR_LEN];
a9d1364c 35 u8 k_re[EAP_AKA_PRIME_K_RE_LEN]; /* EAP-AKA' only */
6fc6879b
JM		 36 u8 msk[EAP_SIM_KEYING_DATA_LEN];
37 u8 emsk[EAP_EMSK_LEN];
38 u8 rand[EAP_AKA_RAND_LEN], autn[EAP_AKA_AUTN_LEN];
39 u8 auts[EAP_AKA_AUTS_LEN];
40
41 int num_id_req, num_notification;
42 u8 *pseudonym;
43 size_t pseudonym_len;
44 u8 *reauth_id;
45 size_t reauth_id_len;
46 int reauth;
47 unsigned int counter, counter_too_small;
48 u8 *last_eap_identity;
49 size_t last_eap_identity_len;
50 enum {
51 CONTINUE, RESULT_SUCCESS, RESULT_FAILURE, SUCCESS, FAILURE
52 } state;
53
54 struct wpabuf *id_msgs;
55 int prev_id;
56 int result_ind, use_result_ind;
a9d1364c
JM		 57 u8 eap_method;
58 u8 *network_name;
59 size_t network_name_len;
60 u16 kdf;
2cfcd014 61 int kdf_negotiation;
6fc6879b
JM		 62};
63
64
65#ifndef CONFIG_NO_STDOUT_DEBUG
66static const char * eap_aka_state_txt(int state)
67{
68 switch (state) {
69 case CONTINUE:
70 return "CONTINUE";
71 case RESULT_SUCCESS:
72 return "RESULT_SUCCESS";
73 case RESULT_FAILURE:
74 return "RESULT_FAILURE";
75 case SUCCESS:
76 return "SUCCESS";
77 case FAILURE:
78 return "FAILURE";
79 default:
80 return "?";
81 }
82}
83#endif /* CONFIG_NO_STDOUT_DEBUG */
84
85
86static void eap_aka_state(struct eap_aka_data *data, int state)
87{
88 wpa_printf(MSG_DEBUG, "EAP-AKA: %s -> %s",
89 eap_aka_state_txt(data->state),
90 eap_aka_state_txt(state));
91 data->state = state;
92}
93
94
95static void * eap_aka_init(struct eap_sm *sm)
96{
97 struct eap_aka_data *data;
98 const char *phase1 = eap_get_config_phase1(sm);
99
100 data = os_zalloc(sizeof(*data));
101 if (data == NULL)
102 return NULL;
103
a9d1364c
JM		 104 data->eap_method = EAP_TYPE_AKA;
105
6fc6879b
JM		 106 eap_aka_state(data, CONTINUE);
107 data->prev_id = -1;
108
109 data->result_ind = phase1 && os_strstr(phase1, "result_ind=1") != NULL;
110
111 return data;
112}
113
114
a9d1364c
JM		 115#ifdef EAP_AKA_PRIME
116static void * eap_aka_prime_init(struct eap_sm *sm)
117{
118 struct eap_aka_data *data = eap_aka_init(sm);
119 if (data == NULL)
120 return NULL;
121 data->eap_method = EAP_TYPE_AKA_PRIME;
122 return data;
123}
124#endif /* EAP_AKA_PRIME */
125
126
6fc6879b
JM		 127static void eap_aka_deinit(struct eap_sm *sm, void *priv)
128{
129 struct eap_aka_data *data = priv;
130 if (data) {
131 os_free(data->pseudonym);
132 os_free(data->reauth_id);
133 os_free(data->last_eap_identity);
134 wpabuf_free(data->id_msgs);
a9d1364c 135 os_free(data->network_name);
6fc6879b
JM		 136 os_free(data);
137 }
138}
139
140
141static int eap_aka_umts_auth(struct eap_sm *sm, struct eap_aka_data *data)
142{
2a24bb31
JM		 143 struct eap_peer_config *conf;
144
6fc6879b 145 wpa_printf(MSG_DEBUG, "EAP-AKA: UMTS authentication algorithm");
2a24bb31
JM		 146
147 conf = eap_get_config(sm);
148 if (conf == NULL)
149 return -1;
150 if (conf->pcsc) {
151 return scard_umts_auth(sm->scard_ctx, data->rand,
152 data->autn, data->res, &data->res_len,
153 data->ik, data->ck, data->auts);
154 }
155
156#ifdef CONFIG_USIM_SIMULATOR
157 if (conf->password) {
158 u8 opc[16], k[16], sqn[6];
159 const char *pos;
160 wpa_printf(MSG_DEBUG, "EAP-AKA: Use internal Milenage "
161 "implementation for UMTS authentication");
162 if (conf->password_len < 78) {
163 wpa_printf(MSG_DEBUG, "EAP-AKA: invalid Milenage "
164 "password");
165 return -1;
166 }
167 pos = (const char *) conf->password;
168 if (hexstr2bin(pos, k, 16))
169 return -1;
170 pos += 32;
171 if (*pos != ':')
172 return -1;
173 pos++;
174
175 if (hexstr2bin(pos, opc, 16))
176 return -1;
177 pos += 32;
178 if (*pos != ':')
179 return -1;
180 pos++;
181
182 if (hexstr2bin(pos, sqn, 6))
183 return -1;
184
185 return milenage_check(opc, k, sqn, data->rand, data->autn,
186 data->ik, data->ck,
187 data->res, &data->res_len, data->auts);
188 }
189#endif /* CONFIG_USIM_SIMULATOR */
190
191#ifdef CONFIG_USIM_HARDCODED
192 wpa_printf(MSG_DEBUG, "EAP-AKA: Use hardcoded Kc and SRES values for "
193 "testing");
194
6fc6879b
JM		 195 /* These hardcoded Kc and SRES values are used for testing.
196 * Could consider making them configurable. */
197 os_memset(data->res, '2', EAP_AKA_RES_MAX_LEN);
198 data->res_len = EAP_AKA_RES_MAX_LEN;
199 os_memset(data->ik, '3', EAP_AKA_IK_LEN);
200 os_memset(data->ck, '4', EAP_AKA_CK_LEN);
201 {
202 u8 autn[EAP_AKA_AUTN_LEN];
203 os_memset(autn, '1', EAP_AKA_AUTN_LEN);
204 if (os_memcmp(autn, data->autn, EAP_AKA_AUTN_LEN) != 0) {
205 wpa_printf(MSG_WARNING, "EAP-AKA: AUTN did not match "
206 "with expected value");
207 return -1;
208 }
209 }
210#if 0
211 {
212 static int test_resync = 1;
213 if (test_resync) {
214 /* Test Resynchronization */
215 test_resync = 0;
216 return -2;
217 }
218 }
219#endif
220 return 0;
2a24bb31
JM		 221
222#else /* CONFIG_USIM_HARDCODED */
223
224 wpa_printf(MSG_DEBUG, "EAP-AKA: No UMTS authentication algorith "
225 "enabled");
226 return -1;
227
228#endif /* CONFIG_USIM_HARDCODED */
6fc6879b
JM		 229}
230
231
232#define CLEAR_PSEUDONYM 0x01
233#define CLEAR_REAUTH_ID 0x02
234#define CLEAR_EAP_ID 0x04
235
236static void eap_aka_clear_identities(struct eap_aka_data *data, int id)
237{
238 wpa_printf(MSG_DEBUG, "EAP-AKA: forgetting old%s%s%s",
239 id & CLEAR_PSEUDONYM ? " pseudonym" : "",
240 id & CLEAR_REAUTH_ID ? " reauth_id" : "",
241 id & CLEAR_EAP_ID ? " eap_id" : "");
242 if (id & CLEAR_PSEUDONYM) {
243 os_free(data->pseudonym);
244 data->pseudonym = NULL;
245 data->pseudonym_len = 0;
246 }
247 if (id & CLEAR_REAUTH_ID) {
248 os_free(data->reauth_id);
249 data->reauth_id = NULL;
250 data->reauth_id_len = 0;
251 }
252 if (id & CLEAR_EAP_ID) {
253 os_free(data->last_eap_identity);
254 data->last_eap_identity = NULL;
255 data->last_eap_identity_len = 0;
256 }
257}
258
259
260static int eap_aka_learn_ids(struct eap_aka_data *data,
261 struct eap_sim_attrs *attr)
262{
263 if (attr->next_pseudonym) {
264 os_free(data->pseudonym);
265 data->pseudonym = os_malloc(attr->next_pseudonym_len);
266 if (data->pseudonym == NULL) {
267 wpa_printf(MSG_INFO, "EAP-AKA: (encr) No memory for "
268 "next pseudonym");
269 return -1;
270 }
271 os_memcpy(data->pseudonym, attr->next_pseudonym,
272 attr->next_pseudonym_len);
273 data->pseudonym_len = attr->next_pseudonym_len;
274 wpa_hexdump_ascii(MSG_DEBUG,
275 "EAP-AKA: (encr) AT_NEXT_PSEUDONYM",
276 data->pseudonym,
277 data->pseudonym_len);
278 }
279
280 if (attr->next_reauth_id) {
281 os_free(data->reauth_id);
282 data->reauth_id = os_malloc(attr->next_reauth_id_len);
283 if (data->reauth_id == NULL) {
284 wpa_printf(MSG_INFO, "EAP-AKA: (encr) No memory for "
285 "next reauth_id");
286 return -1;
287 }
288 os_memcpy(data->reauth_id, attr->next_reauth_id,
289 attr->next_reauth_id_len);
290 data->reauth_id_len = attr->next_reauth_id_len;
291 wpa_hexdump_ascii(MSG_DEBUG,
292 "EAP-AKA: (encr) AT_NEXT_REAUTH_ID",
293 data->reauth_id,
294 data->reauth_id_len);
295 }
296
297 return 0;
298}
299
300
301static int eap_aka_add_id_msg(struct eap_aka_data *data,
302 const struct wpabuf *msg)
303{
304 if (msg == NULL)
305 return -1;
306
307 if (data->id_msgs == NULL) {
308 data->id_msgs = wpabuf_dup(msg);
309 return data->id_msgs == NULL ? -1 : 0;
310 }
311
312 if (wpabuf_resize(&data->id_msgs, wpabuf_len(msg)) < 0)
313 return -1;
314 wpabuf_put_buf(data->id_msgs, msg);
315
316 return 0;
317}
318
319
320static void eap_aka_add_checkcode(struct eap_aka_data *data,
321 struct eap_sim_msg *msg)
322{
323 const u8 *addr;
324 size_t len;
a9d1364c 325 u8 hash[SHA256_MAC_LEN];
6fc6879b
JM		 326
327 wpa_printf(MSG_DEBUG, " AT_CHECKCODE");
328
329 if (data->id_msgs == NULL) {
330 /*
331 * No EAP-AKA/Identity packets were exchanged - send empty
332 * checkcode.
333 */
334 eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, NULL, 0);
335 return;
336 }
337
a9d1364c 338 /* Checkcode is SHA1/SHA256 hash over all EAP-AKA/Identity packets. */
6fc6879b
JM		 339 addr = wpabuf_head(data->id_msgs);
340 len = wpabuf_len(data->id_msgs);
341 wpa_hexdump(MSG_MSGDUMP, "EAP-AKA: AT_CHECKCODE data", addr, len);
3ee81d48 342#ifdef EAP_AKA_PRIME
a9d1364c
JM		 343 if (data->eap_method == EAP_TYPE_AKA_PRIME)
344 sha256_vector(1, &addr, &len, hash);
345 else
3ee81d48 346#endif /* EAP_AKA_PRIME */
a9d1364c 347 sha1_vector(1, &addr, &len, hash);
6fc6879b
JM		 348
349 eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, hash,
a9d1364c
JM		 350 data->eap_method == EAP_TYPE_AKA_PRIME ?
351 EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN);
6fc6879b
JM		 352}
353
354
355static int eap_aka_verify_checkcode(struct eap_aka_data *data,
356 const u8 *checkcode, size_t checkcode_len)
357{
358 const u8 *addr;
359 size_t len;
a9d1364c
JM		 360 u8 hash[SHA256_MAC_LEN];
361 size_t hash_len;
6fc6879b
JM		 362
363 if (checkcode == NULL)
364 return -1;
365
366 if (data->id_msgs == NULL) {
367 if (checkcode_len != 0) {
368 wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from server "
369 "indicates that AKA/Identity messages were "
370 "used, but they were not");
371 return -1;
372 }
373 return 0;
374 }
375
a9d1364c
JM		 376 hash_len = data->eap_method == EAP_TYPE_AKA_PRIME ?
377 EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN;
378
379 if (checkcode_len != hash_len) {
6fc6879b
JM		 380 wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from server "
381 "indicates that AKA/Identity message were not "
382 "used, but they were");
383 return -1;
384 }
385
a9d1364c 386 /* Checkcode is SHA1/SHA256 hash over all EAP-AKA/Identity packets. */
6fc6879b
JM		 387 addr = wpabuf_head(data->id_msgs);
388 len = wpabuf_len(data->id_msgs);
3ee81d48 389#ifdef EAP_AKA_PRIME
a9d1364c
JM		 390 if (data->eap_method == EAP_TYPE_AKA_PRIME)
391 sha256_vector(1, &addr, &len, hash);
392 else
3ee81d48 393#endif /* EAP_AKA_PRIME */
a9d1364c 394 sha1_vector(1, &addr, &len, hash);
6fc6879b 395
a9d1364c 396 if (os_memcmp(hash, checkcode, hash_len) != 0) {
6fc6879b
JM		 397 wpa_printf(MSG_DEBUG, "EAP-AKA: Mismatch in AT_CHECKCODE");
398 return -1;
399 }
400
401 return 0;
402}
403
404
405static struct wpabuf * eap_aka_client_error(struct eap_aka_data *data, u8 id,
406 int err)
407{
408 struct eap_sim_msg *msg;
409
410 eap_aka_state(data, FAILURE);
411 data->num_id_req = 0;
412 data->num_notification = 0;
413
a9d1364c 414 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
6fc6879b
JM		 415 EAP_AKA_SUBTYPE_CLIENT_ERROR);
416 eap_sim_msg_add(msg, EAP_SIM_AT_CLIENT_ERROR_CODE, err, NULL, 0);
417 return eap_sim_msg_finish(msg, NULL, NULL, 0);
418}
419
420
421static struct wpabuf * eap_aka_authentication_reject(struct eap_aka_data *data,
422 u8 id)
423{
424 struct eap_sim_msg *msg;
425
426 eap_aka_state(data, FAILURE);
427 data->num_id_req = 0;
428 data->num_notification = 0;
429
430 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Authentication-Reject "
431 "(id=%d)", id);
a9d1364c 432 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
6fc6879b
JM		 433 EAP_AKA_SUBTYPE_AUTHENTICATION_REJECT);
434 return eap_sim_msg_finish(msg, NULL, NULL, 0);
435}
436
437
438static struct wpabuf * eap_aka_synchronization_failure(
439 struct eap_aka_data *data, u8 id)
440{
441 struct eap_sim_msg *msg;
442
443 data->num_id_req = 0;
444 data->num_notification = 0;
445
446 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Synchronization-Failure "
447 "(id=%d)", id);
a9d1364c 448 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
6fc6879b
JM		 449 EAP_AKA_SUBTYPE_SYNCHRONIZATION_FAILURE);
450 wpa_printf(MSG_DEBUG, " AT_AUTS");
451 eap_sim_msg_add_full(msg, EAP_SIM_AT_AUTS, data->auts,
452 EAP_AKA_AUTS_LEN);
453 return eap_sim_msg_finish(msg, NULL, NULL, 0);
454}
455
456
457static struct wpabuf * eap_aka_response_identity(struct eap_sm *sm,
458 struct eap_aka_data *data,
459 u8 id,
460 enum eap_sim_id_req id_req)
461{
462 const u8 *identity = NULL;
463 size_t identity_len = 0;
464 struct eap_sim_msg *msg;
465
466 data->reauth = 0;
467 if (id_req == ANY_ID && data->reauth_id) {
468 identity = data->reauth_id;
469 identity_len = data->reauth_id_len;
470 data->reauth = 1;
471 } else if ((id_req == ANY_ID || id_req == FULLAUTH_ID) &&
472 data->pseudonym) {
473 identity = data->pseudonym;
474 identity_len = data->pseudonym_len;
475 eap_aka_clear_identities(data, CLEAR_REAUTH_ID);
476 } else if (id_req != NO_ID_REQ) {
477 identity = eap_get_config_identity(sm, &identity_len);
478 if (identity) {
479 eap_aka_clear_identities(data, CLEAR_PSEUDONYM |
480 CLEAR_REAUTH_ID);
481 }
482 }
483 if (id_req != NO_ID_REQ)
484 eap_aka_clear_identities(data, CLEAR_EAP_ID);
485
486 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Identity (id=%d)", id);
a9d1364c 487 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
6fc6879b
JM		 488 EAP_AKA_SUBTYPE_IDENTITY);
489
490 if (identity) {
491 wpa_hexdump_ascii(MSG_DEBUG, " AT_IDENTITY",
492 identity, identity_len);
493 eap_sim_msg_add(msg, EAP_SIM_AT_IDENTITY, identity_len,
494 identity, identity_len);
495 }
496
497 return eap_sim_msg_finish(msg, NULL, NULL, 0);
498}
499
500
501static struct wpabuf * eap_aka_response_challenge(struct eap_aka_data *data,
502 u8 id)
503{
504 struct eap_sim_msg *msg;
505
506 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Challenge (id=%d)", id);
a9d1364c 507 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
6fc6879b
JM		 508 EAP_AKA_SUBTYPE_CHALLENGE);
509 wpa_printf(MSG_DEBUG, " AT_RES");
fa71a1d8 510 eap_sim_msg_add(msg, EAP_SIM_AT_RES, data->res_len * 8,
6fc6879b
JM		 511 data->res, data->res_len);
512 eap_aka_add_checkcode(data, msg);
513 if (data->use_result_ind) {
514 wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
515 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
516 }
517 wpa_printf(MSG_DEBUG, " AT_MAC");
518 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
519 return eap_sim_msg_finish(msg, data->k_aut, (u8 *) "", 0);
520}
521
522
523static struct wpabuf * eap_aka_response_reauth(struct eap_aka_data *data,
524 u8 id, int counter_too_small,
525 const u8 *nonce_s)
526{
527 struct eap_sim_msg *msg;
528 unsigned int counter;
529
530 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Reauthentication (id=%d)",
531 id);
a9d1364c 532 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
6fc6879b
JM		 533 EAP_AKA_SUBTYPE_REAUTHENTICATION);
534 wpa_printf(MSG_DEBUG, " AT_IV");
535 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
536 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA);
537
538 if (counter_too_small) {
539 wpa_printf(MSG_DEBUG, " *AT_COUNTER_TOO_SMALL");
540 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER_TOO_SMALL, 0, NULL, 0);
541 counter = data->counter_too_small;
542 } else
543 counter = data->counter;
544
545 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", counter);
546 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0);
547
548 if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) {
549 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to encrypt "
550 "AT_ENCR_DATA");
551 eap_sim_msg_free(msg);
552 return NULL;
553 }
554 eap_aka_add_checkcode(data, msg);
555 if (data->use_result_ind) {
556 wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
557 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
558 }
559 wpa_printf(MSG_DEBUG, " AT_MAC");
560 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
561 return eap_sim_msg_finish(msg, data->k_aut, nonce_s,
562 EAP_SIM_NONCE_S_LEN);
563}
564
565
566static struct wpabuf * eap_aka_response_notification(struct eap_aka_data *data,
567 u8 id, u16 notification)
568{
569 struct eap_sim_msg *msg;
570 u8 *k_aut = (notification & 0x4000) == 0 ? data->k_aut : NULL;
571
572 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Notification (id=%d)", id);
a9d1364c 573 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
6fc6879b
JM		 574 EAP_AKA_SUBTYPE_NOTIFICATION);
575 if (k_aut && data->reauth) {
576 wpa_printf(MSG_DEBUG, " AT_IV");
577 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
578 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV,
579 EAP_SIM_AT_ENCR_DATA);
580 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", data->counter);
581 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter,
582 NULL, 0);
583 if (eap_sim_msg_add_encr_end(msg, data->k_encr,
584 EAP_SIM_AT_PADDING)) {
585 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to encrypt "
586 "AT_ENCR_DATA");
587 eap_sim_msg_free(msg);
588 return NULL;
589 }
590 }
591 if (k_aut) {
592 wpa_printf(MSG_DEBUG, " AT_MAC");
593 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
594 }
595 return eap_sim_msg_finish(msg, k_aut, (u8 *) "", 0);
596}
597
598
599static struct wpabuf * eap_aka_process_identity(struct eap_sm *sm,
600 struct eap_aka_data *data,
601 u8 id,
602 const struct wpabuf *reqData,
603 struct eap_sim_attrs *attr)
604{
605 int id_error;
606 struct wpabuf *buf;
607
608 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Identity");
609
610 id_error = 0;
611 switch (attr->id_req) {
612 case NO_ID_REQ:
613 break;
614 case ANY_ID:
615 if (data->num_id_req > 0)
616 id_error++;
617 data->num_id_req++;
618 break;
619 case FULLAUTH_ID:
620 if (data->num_id_req > 1)
621 id_error++;
622 data->num_id_req++;
623 break;
624 case PERMANENT_ID:
625 if (data->num_id_req > 2)
626 id_error++;
627 data->num_id_req++;
628 break;
629 }
630 if (id_error) {
631 wpa_printf(MSG_INFO, "EAP-AKA: Too many ID requests "
632 "used within one authentication");
633 return eap_aka_client_error(data, id,
634 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
635 }
636
637 buf = eap_aka_response_identity(sm, data, id, attr->id_req);
638
639 if (data->prev_id != id) {
640 eap_aka_add_id_msg(data, reqData);
641 eap_aka_add_id_msg(data, buf);
642 data->prev_id = id;
643 }
644
645 return buf;
646}
647
648
a9d1364c
JM		 649static int eap_aka_verify_mac(struct eap_aka_data *data,
650 const struct wpabuf *req,
651 const u8 *mac, const u8 *extra,
652 size_t extra_len)
653{
654 if (data->eap_method == EAP_TYPE_AKA_PRIME)
655 return eap_sim_verify_mac_sha256(data->k_aut, req, mac, extra,
656 extra_len);
657 return eap_sim_verify_mac(data->k_aut, req, mac, extra, extra_len);
658}
659
660
661#ifdef EAP_AKA_PRIME
662static struct wpabuf * eap_aka_prime_kdf_select(struct eap_aka_data *data,
663 u8 id, u16 kdf)
664{
665 struct eap_sim_msg *msg;
666
2cfcd014 667 data->kdf_negotiation = 1;
a9d1364c
JM		 668 data->kdf = kdf;
669 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Challenge (id=%d) (KDF "
670 "select)", id);
671 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
672 EAP_AKA_SUBTYPE_CHALLENGE);
673 wpa_printf(MSG_DEBUG, " AT_KDF");
674 eap_sim_msg_add(msg, EAP_SIM_AT_KDF, kdf, NULL, 0);
675 return eap_sim_msg_finish(msg, NULL, NULL, 0);
676}
677
678
679static struct wpabuf * eap_aka_prime_kdf_neg(struct eap_aka_data *data,
680 u8 id, struct eap_sim_attrs *attr)
681{
682 size_t i;
683
684 for (i = 0; i < attr->kdf_count; i++) {
685 if (attr->kdf[i] == EAP_AKA_PRIME_KDF)
686 return eap_aka_prime_kdf_select(data, id,
687 EAP_AKA_PRIME_KDF);
688 }
689
690 /* No matching KDF found - fail authentication as if AUTN had been
691 * incorrect */
692 return eap_aka_authentication_reject(data, id);
693}
694
695
696static int eap_aka_prime_kdf_valid(struct eap_aka_data *data,
697 struct eap_sim_attrs *attr)
698{
699 size_t i, j;
700
701 if (attr->kdf_count == 0)
702 return 0;
703
704 /* The only allowed (and required) duplication of a KDF is the addition
705 * of the selected KDF into the beginning of the list. */
706
2cfcd014 707 if (data->kdf_negotiation) {
a9d1364c
JM		 708 if (attr->kdf[0] != data->kdf) {
709 wpa_printf(MSG_WARNING, "EAP-AKA': The server did not "
710 "accept the selected KDF");
711 return 0;
712 }
713
714 for (i = 1; i < attr->kdf_count; i++) {
715 if (attr->kdf[i] == data->kdf)
716 break;
717 }
718 if (i == attr->kdf_count &&
719 attr->kdf_count < EAP_AKA_PRIME_KDF_MAX) {
720 wpa_printf(MSG_WARNING, "EAP-AKA': The server did not "
721 "duplicate the selected KDF");
722 return 0;
723 }
724
725 /* TODO: should check that the list is identical to the one
726 * used in the previous Challenge message apart from the added
727 * entry in the beginning. */
728 }
729
730 for (i = data->kdf ? 1 : 0; i < attr->kdf_count; i++) {
731 for (j = i + 1; j < attr->kdf_count; j++) {
732 if (attr->kdf[i] == attr->kdf[j]) {
733 wpa_printf(MSG_WARNING, "EAP-AKA': The server "
734 "included a duplicated KDF");
735 return 0;
736 }
737 }
738 }
739
740 return 1;
741}
742#endif /* EAP_AKA_PRIME */
743
744
6fc6879b
JM		 745static struct wpabuf * eap_aka_process_challenge(struct eap_sm *sm,
746 struct eap_aka_data *data,
747 u8 id,
748 const struct wpabuf *reqData,
749 struct eap_sim_attrs *attr)
750{
751 const u8 *identity;
752 size_t identity_len;
753 int res;
754 struct eap_sim_attrs eattr;
755
756 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Challenge");
757
758 if (attr->checkcode &&
759 eap_aka_verify_checkcode(data, attr->checkcode,
760 attr->checkcode_len)) {
761 wpa_printf(MSG_WARNING, "EAP-AKA: Invalid AT_CHECKCODE in the "
762 "message");
763 return eap_aka_client_error(data, id,
764 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
765 }
766
a9d1364c
JM		 767#ifdef EAP_AKA_PRIME
768 if (data->eap_method == EAP_TYPE_AKA_PRIME) {
769 if (!attr->kdf_input || attr->kdf_input_len == 0) {
770 wpa_printf(MSG_WARNING, "EAP-AKA': Challenge message "
771 "did not include non-empty AT_KDF_INPUT");
772 /* Fail authentication as if AUTN had been incorrect */
773 return eap_aka_authentication_reject(data, id);
774 }
775 os_free(data->network_name);
776 data->network_name = os_malloc(attr->kdf_input_len);
777 if (data->network_name == NULL) {
778 wpa_printf(MSG_WARNING, "EAP-AKA': No memory for "
779 "storing Network Name");
780 return eap_aka_authentication_reject(data, id);
781 }
782 os_memcpy(data->network_name, attr->kdf_input,
783 attr->kdf_input_len);
784 data->network_name_len = attr->kdf_input_len;
785 wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA': Network Name "
786 "(AT_KDF_INPUT)",
787 data->network_name, data->network_name_len);
788 /* TODO: check Network Name per 3GPP.33.402 */
789
790 if (!eap_aka_prime_kdf_valid(data, attr))
791 return eap_aka_authentication_reject(data, id);
792
793 if (attr->kdf[0] != EAP_AKA_PRIME_KDF)
794 return eap_aka_prime_kdf_neg(data, id, attr);
795
796 data->kdf = EAP_AKA_PRIME_KDF;
797 wpa_printf(MSG_DEBUG, "EAP-AKA': KDF %d selected", data->kdf);
798 }
799
800 if (data->eap_method == EAP_TYPE_AKA && attr->bidding) {
801 u16 flags = WPA_GET_BE16(attr->bidding);
802 if ((flags & EAP_AKA_BIDDING_FLAG_D) &&
803 eap_allowed_method(sm, EAP_VENDOR_IETF,
804 EAP_TYPE_AKA_PRIME)) {
805 wpa_printf(MSG_WARNING, "EAP-AKA: Bidding down from "
806 "AKA' to AKA detected");
807 /* Fail authentication as if AUTN had been incorrect */
808 return eap_aka_authentication_reject(data, id);
809 }
810 }
811#endif /* EAP_AKA_PRIME */
812
6fc6879b
JM		 813 data->reauth = 0;
814 if (!attr->mac || !attr->rand || !attr->autn) {
815 wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message "
816 "did not include%s%s%s",
817 !attr->mac ? " AT_MAC" : "",
818 !attr->rand ? " AT_RAND" : "",
819 !attr->autn ? " AT_AUTN" : "");
820 return eap_aka_client_error(data, id,
821 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
822 }
823 os_memcpy(data->rand, attr->rand, EAP_AKA_RAND_LEN);
824 os_memcpy(data->autn, attr->autn, EAP_AKA_AUTN_LEN);
825
826 res = eap_aka_umts_auth(sm, data);
827 if (res == -1) {
828 wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication "
829 "failed (AUTN)");
830 return eap_aka_authentication_reject(data, id);
831 } else if (res == -2) {
832 wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication "
833 "failed (AUTN seq# -> AUTS)");
834 return eap_aka_synchronization_failure(data, id);
835 } else if (res) {
836 wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication failed");
837 return eap_aka_client_error(data, id,
838 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
839 }
a9d1364c
JM		 840#ifdef EAP_AKA_PRIME
841 if (data->eap_method == EAP_TYPE_AKA_PRIME) {
842 /* Note: AUTN = (SQN ^ AK) || AMF || MAC which gives us the
35f30422
JM		 843 * needed 6-octet SQN ^ AK for CK',IK' derivation */
844 u16 amf = WPA_GET_BE16(data->autn + 6);
845 if (!(amf & 0x8000)) {
846 wpa_printf(MSG_WARNING, "EAP-AKA': AMF separation bit "
847 "not set (AMF=0x%4x)", amf);
848 return eap_aka_authentication_reject(data, id);
849 }
a9d1364c
JM		 850 eap_aka_prime_derive_ck_ik_prime(data->ck, data->ik,
851 data->autn,
852 data->network_name,
853 data->network_name_len);
854 }
855#endif /* EAP_AKA_PRIME */
6fc6879b
JM		 856 if (data->last_eap_identity) {
857 identity = data->last_eap_identity;
858 identity_len = data->last_eap_identity_len;
859 } else if (data->pseudonym) {
860 identity = data->pseudonym;
861 identity_len = data->pseudonym_len;
862 } else
863 identity = eap_get_config_identity(sm, &identity_len);
864 wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA: Selected identity for MK "
865 "derivation", identity, identity_len);
a9d1364c
JM		 866 if (data->eap_method == EAP_TYPE_AKA_PRIME) {
867 eap_aka_prime_derive_keys(identity, identity_len, data->ik,
868 data->ck, data->k_encr, data->k_aut,
869 data->k_re, data->msk, data->emsk);
870 } else {
871 eap_aka_derive_mk(identity, identity_len, data->ik, data->ck,
872 data->mk);
873 eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut,
874 data->msk, data->emsk);
875 }
876 if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
6fc6879b
JM		 877 wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message "
878 "used invalid AT_MAC");
879 return eap_aka_client_error(data, id,
880 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
881 }
882
883 /* Old reauthentication and pseudonym identities must not be used
884 * anymore. In other words, if no new identities are received, full
885 * authentication will be used on next reauthentication. */
886 eap_aka_clear_identities(data, CLEAR_PSEUDONYM | CLEAR_REAUTH_ID |
887 CLEAR_EAP_ID);
888
889 if (attr->encr_data) {
890 u8 *decrypted;
891 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
892 attr->encr_data_len, attr->iv,
893 &eattr, 0);
894 if (decrypted == NULL) {
895 return eap_aka_client_error(
896 data, id, EAP_AKA_UNABLE_TO_PROCESS_PACKET);
897 }
898 eap_aka_learn_ids(data, &eattr);
899 os_free(decrypted);
900 }
901
902 if (data->result_ind && attr->result_ind)
903 data->use_result_ind = 1;
904
905 if (data->state != FAILURE && data->state != RESULT_FAILURE) {
906 eap_aka_state(data, data->use_result_ind ?
907 RESULT_SUCCESS : SUCCESS);
908 }
909
910 data->num_id_req = 0;
911 data->num_notification = 0;
912 /* RFC 4187 specifies that counter is initialized to one after
913 * fullauth, but initializing it to zero makes it easier to implement
914 * reauth verification. */
915 data->counter = 0;
916 return eap_aka_response_challenge(data, id);
917}
918
919
920static int eap_aka_process_notification_reauth(struct eap_aka_data *data,
921 struct eap_sim_attrs *attr)
922{
923 struct eap_sim_attrs eattr;
924 u8 *decrypted;
925
926 if (attr->encr_data == NULL || attr->iv == NULL) {
927 wpa_printf(MSG_WARNING, "EAP-AKA: Notification message after "
928 "reauth did not include encrypted data");
929 return -1;
930 }
931
932 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
933 attr->encr_data_len, attr->iv, &eattr,
934 0);
935 if (decrypted == NULL) {
936 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to parse encrypted "
937 "data from notification message");
938 return -1;
939 }
940
941 if (eattr.counter < 0 || (size_t) eattr.counter != data->counter) {
942 wpa_printf(MSG_WARNING, "EAP-AKA: Counter in notification "
943 "message does not match with counter in reauth "
944 "message");
945 os_free(decrypted);
946 return -1;
947 }
948
949 os_free(decrypted);
950 return 0;
951}
952
953
954static int eap_aka_process_notification_auth(struct eap_aka_data *data,
955 const struct wpabuf *reqData,
956 struct eap_sim_attrs *attr)
957{
958 if (attr->mac == NULL) {
959 wpa_printf(MSG_INFO, "EAP-AKA: no AT_MAC in after_auth "
960 "Notification message");
961 return -1;
962 }
963
a9d1364c 964 if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
6fc6879b
JM		 965 wpa_printf(MSG_WARNING, "EAP-AKA: Notification message "
966 "used invalid AT_MAC");
967 return -1;
968 }
969
970 if (data->reauth &&
971 eap_aka_process_notification_reauth(data, attr)) {
972 wpa_printf(MSG_WARNING, "EAP-AKA: Invalid notification "
973 "message after reauth");
974 return -1;
975 }
976
977 return 0;
978}
979
980
981static struct wpabuf * eap_aka_process_notification(
982 struct eap_sm *sm, struct eap_aka_data *data, u8 id,
983 const struct wpabuf *reqData, struct eap_sim_attrs *attr)
984{
985 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Notification");
986 if (data->num_notification > 0) {
987 wpa_printf(MSG_INFO, "EAP-AKA: too many notification "
988 "rounds (only one allowed)");
989 return eap_aka_client_error(data, id,
990 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
991 }
992 data->num_notification++;
993 if (attr->notification == -1) {
994 wpa_printf(MSG_INFO, "EAP-AKA: no AT_NOTIFICATION in "
995 "Notification message");
996 return eap_aka_client_error(data, id,
997 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
998 }
999
1000 if ((attr->notification & 0x4000) == 0 &&
1001 eap_aka_process_notification_auth(data, reqData, attr)) {
1002 return eap_aka_client_error(data, id,
1003 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1004 }
1005
1006 eap_sim_report_notification(sm->msg_ctx, attr->notification, 1);
1007 if (attr->notification >= 0 && attr->notification < 32768) {
1008 eap_aka_state(data, FAILURE);
1009 } else if (attr->notification == EAP_SIM_SUCCESS &&
1010 data->state == RESULT_SUCCESS)
1011 eap_aka_state(data, SUCCESS);
1012 return eap_aka_response_notification(data, id, attr->notification);
1013}
1014
1015
1016static struct wpabuf * eap_aka_process_reauthentication(
1017 struct eap_sm *sm, struct eap_aka_data *data, u8 id,
1018 const struct wpabuf *reqData, struct eap_sim_attrs *attr)
1019{
1020 struct eap_sim_attrs eattr;
1021 u8 *decrypted;
1022
1023 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Reauthentication");
1024
1025 if (attr->checkcode &&
1026 eap_aka_verify_checkcode(data, attr->checkcode,
1027 attr->checkcode_len)) {
1028 wpa_printf(MSG_WARNING, "EAP-AKA: Invalid AT_CHECKCODE in the "
1029 "message");
1030 return eap_aka_client_error(data, id,
1031 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1032 }
1033
1034 if (data->reauth_id == NULL) {
1035 wpa_printf(MSG_WARNING, "EAP-AKA: Server is trying "
1036 "reauthentication, but no reauth_id available");
1037 return eap_aka_client_error(data, id,
1038 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1039 }
1040
1041 data->reauth = 1;
a9d1364c 1042 if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
6fc6879b
JM		 1043 wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication "
1044 "did not have valid AT_MAC");
1045 return eap_aka_client_error(data, id,
1046 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1047 }
1048
1049 if (attr->encr_data == NULL || attr->iv == NULL) {
1050 wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication "
1051 "message did not include encrypted data");
1052 return eap_aka_client_error(data, id,
1053 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1054 }
1055
1056 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
1057 attr->encr_data_len, attr->iv, &eattr,
1058 0);
1059 if (decrypted == NULL) {
1060 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to parse encrypted "
1061 "data from reauthentication message");
1062 return eap_aka_client_error(data, id,
1063 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1064 }
1065
1066 if (eattr.nonce_s == NULL || eattr.counter < 0) {
1067 wpa_printf(MSG_INFO, "EAP-AKA: (encr) No%s%s in reauth packet",
1068 !eattr.nonce_s ? " AT_NONCE_S" : "",
1069 eattr.counter < 0 ? " AT_COUNTER" : "");
1070 os_free(decrypted);
1071 return eap_aka_client_error(data, id,
1072 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1073 }
1074
1075 if (eattr.counter < 0 || (size_t) eattr.counter <= data->counter) {
1076 struct wpabuf *res;
1077 wpa_printf(MSG_INFO, "EAP-AKA: (encr) Invalid counter "
1078 "(%d <= %d)", eattr.counter, data->counter);
1079 data->counter_too_small = eattr.counter;
1080
6fc6879b
JM		 1081 /* Reply using Re-auth w/ AT_COUNTER_TOO_SMALL. The current
1082 * reauth_id must not be used to start a new reauthentication.
1083 * However, since it was used in the last EAP-Response-Identity
1084 * packet, it has to saved for the following fullauth to be
1085 * used in MK derivation. */
1086 os_free(data->last_eap_identity);
1087 data->last_eap_identity = data->reauth_id;
1088 data->last_eap_identity_len = data->reauth_id_len;
1089 data->reauth_id = NULL;
1090 data->reauth_id_len = 0;
1091
1092 res = eap_aka_response_reauth(data, id, 1, eattr.nonce_s);
1093 os_free(decrypted);
1094
1095 return res;
1096 }
1097 data->counter = eattr.counter;
1098
1099 os_memcpy(data->nonce_s, eattr.nonce_s, EAP_SIM_NONCE_S_LEN);
1100 wpa_hexdump(MSG_DEBUG, "EAP-AKA: (encr) AT_NONCE_S",
1101 data->nonce_s, EAP_SIM_NONCE_S_LEN);
1102
a9d1364c
JM		 1103 if (data->eap_method == EAP_TYPE_AKA_PRIME) {
1104 eap_aka_prime_derive_keys_reauth(data->k_re, data->counter,
1105 data->reauth_id,
1106 data->reauth_id_len,
1107 data->nonce_s,
1108 data->msk, data->emsk);
1109 } else {
1110 eap_sim_derive_keys_reauth(data->counter, data->reauth_id,
1111 data->reauth_id_len,
1112 data->nonce_s, data->mk,
1113 data->msk, data->emsk);
1114 }
6fc6879b
JM		 1115 eap_aka_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
1116 eap_aka_learn_ids(data, &eattr);
1117
1118 if (data->result_ind && attr->result_ind)
1119 data->use_result_ind = 1;
1120
1121 if (data->state != FAILURE && data->state != RESULT_FAILURE) {
1122 eap_aka_state(data, data->use_result_ind ?
1123 RESULT_SUCCESS : SUCCESS);
1124 }
1125
1126 data->num_id_req = 0;
1127 data->num_notification = 0;
1128 if (data->counter > EAP_AKA_MAX_FAST_REAUTHS) {
1129 wpa_printf(MSG_DEBUG, "EAP-AKA: Maximum number of "
1130 "fast reauths performed - force fullauth");
1131 eap_aka_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
1132 }
1133 os_free(decrypted);
1134 return eap_aka_response_reauth(data, id, 0, data->nonce_s);
1135}
1136
1137
1138static struct wpabuf * eap_aka_process(struct eap_sm *sm, void *priv,
1139 struct eap_method_ret *ret,
1140 const struct wpabuf *reqData)
1141{
1142 struct eap_aka_data *data = priv;
1143 const struct eap_hdr *req;
1144 u8 subtype, id;
1145 struct wpabuf *res;
1146 const u8 *pos;
1147 struct eap_sim_attrs attr;
1148 size_t len;
1149
1150 wpa_hexdump_buf(MSG_DEBUG, "EAP-AKA: EAP data", reqData);
1151 if (eap_get_config_identity(sm, &len) == NULL) {
1152 wpa_printf(MSG_INFO, "EAP-AKA: Identity not configured");
1153 eap_sm_request_identity(sm);
1154 ret->ignore = TRUE;
1155 return NULL;
1156 }
1157
a9d1364c
JM		 1158 pos = eap_hdr_validate(EAP_VENDOR_IETF, data->eap_method, reqData,
1159 &len);
6fc6879b
JM		 1160 if (pos == NULL || len < 1) {
1161 ret->ignore = TRUE;
1162 return NULL;
1163 }
1164 req = wpabuf_head(reqData);
1165 id = req->identifier;
1166 len = be_to_host16(req->length);
1167
1168 ret->ignore = FALSE;
1169 ret->methodState = METHOD_MAY_CONT;
1170 ret->decision = DECISION_FAIL;
1171 ret->allowNotifications = TRUE;
1172
1173 subtype = *pos++;
1174 wpa_printf(MSG_DEBUG, "EAP-AKA: Subtype=%d", subtype);
1175 pos += 2; /* Reserved */
1176
a9d1364c
JM		 1177 if (eap_sim_parse_attr(pos, wpabuf_head_u8(reqData) + len, &attr,
1178 data->eap_method == EAP_TYPE_AKA_PRIME ? 2 : 1,
6fc6879b
JM		 1179 0)) {
1180 res = eap_aka_client_error(data, id,
1181 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1182 goto done;
1183 }
1184
1185 switch (subtype) {
1186 case EAP_AKA_SUBTYPE_IDENTITY:
1187 res = eap_aka_process_identity(sm, data, id, reqData, &attr);
1188 break;
1189 case EAP_AKA_SUBTYPE_CHALLENGE:
1190 res = eap_aka_process_challenge(sm, data, id, reqData, &attr);
1191 break;
1192 case EAP_AKA_SUBTYPE_NOTIFICATION:
1193 res = eap_aka_process_notification(sm, data, id, reqData,
1194 &attr);
1195 break;
1196 case EAP_AKA_SUBTYPE_REAUTHENTICATION:
1197 res = eap_aka_process_reauthentication(sm, data, id, reqData,
1198 &attr);
1199 break;
1200 case EAP_AKA_SUBTYPE_CLIENT_ERROR:
1201 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Client-Error");
1202 res = eap_aka_client_error(data, id,
1203 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1204 break;
1205 default:
1206 wpa_printf(MSG_DEBUG, "EAP-AKA: Unknown subtype=%d", subtype);
1207 res = eap_aka_client_error(data, id,
1208 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1209 break;
1210 }
1211
1212done:
1213 if (data->state == FAILURE) {
1214 ret->decision = DECISION_FAIL;
1215 ret->methodState = METHOD_DONE;
1216 } else if (data->state == SUCCESS) {
1217 ret->decision = data->use_result_ind ?
1218 DECISION_UNCOND_SUCC : DECISION_COND_SUCC;
1219 /*
1220 * It is possible for the server to reply with AKA
1221 * Notification, so we must allow the method to continue and
1222 * not only accept EAP-Success at this point.
1223 */
1224 ret->methodState = data->use_result_ind ?
1225 METHOD_DONE : METHOD_MAY_CONT;
1226 } else if (data->state == RESULT_FAILURE)
1227 ret->methodState = METHOD_CONT;
1228 else if (data->state == RESULT_SUCCESS)
1229 ret->methodState = METHOD_CONT;
1230
1231 if (ret->methodState == METHOD_DONE) {
1232 ret->allowNotifications = FALSE;
1233 }
1234
1235 return res;
1236}
1237
1238
1239static Boolean eap_aka_has_reauth_data(struct eap_sm *sm, void *priv)
1240{
1241 struct eap_aka_data *data = priv;
1242 return data->pseudonym || data->reauth_id;
1243}
1244
1245
1246static void eap_aka_deinit_for_reauth(struct eap_sm *sm, void *priv)
1247{
1248 struct eap_aka_data *data = priv;
1249 eap_aka_clear_identities(data, CLEAR_EAP_ID);
1250 data->prev_id = -1;
1251 wpabuf_free(data->id_msgs);
1252 data->id_msgs = NULL;
1253 data->use_result_ind = 0;
2cfcd014 1254 data->kdf_negotiation = 0;
6fc6879b
JM		 1255}
1256
1257
1258static void * eap_aka_init_for_reauth(struct eap_sm *sm, void *priv)
1259{
1260 struct eap_aka_data *data = priv;
1261 data->num_id_req = 0;
1262 data->num_notification = 0;
1263 eap_aka_state(data, CONTINUE);
1264 return priv;
1265}
1266
1267
1268static const u8 * eap_aka_get_identity(struct eap_sm *sm, void *priv,
1269 size_t *len)
1270{
1271 struct eap_aka_data *data = priv;
1272
1273 if (data->reauth_id) {
1274 *len = data->reauth_id_len;
1275 return data->reauth_id;
1276 }
1277
1278 if (data->pseudonym) {
1279 *len = data->pseudonym_len;
1280 return data->pseudonym;
1281 }
1282
1283 return NULL;
1284}
1285
1286
1287static Boolean eap_aka_isKeyAvailable(struct eap_sm *sm, void *priv)
1288{
1289 struct eap_aka_data *data = priv;
1290 return data->state == SUCCESS;
1291}
1292
1293
1294static u8 * eap_aka_getKey(struct eap_sm *sm, void *priv, size_t *len)
1295{
1296 struct eap_aka_data *data = priv;
1297 u8 *key;
1298
1299 if (data->state != SUCCESS)
1300 return NULL;
1301
1302 key = os_malloc(EAP_SIM_KEYING_DATA_LEN);
1303 if (key == NULL)
1304 return NULL;
1305
1306 *len = EAP_SIM_KEYING_DATA_LEN;
1307 os_memcpy(key, data->msk, EAP_SIM_KEYING_DATA_LEN);
1308
1309 return key;
1310}
1311
1312
1313static u8 * eap_aka_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1314{
1315 struct eap_aka_data *data = priv;
1316 u8 *key;
1317
1318 if (data->state != SUCCESS)
1319 return NULL;
1320
1321 key = os_malloc(EAP_EMSK_LEN);
1322 if (key == NULL)
1323 return NULL;
1324
1325 *len = EAP_EMSK_LEN;
1326 os_memcpy(key, data->emsk, EAP_EMSK_LEN);
1327
1328 return key;
1329}
1330
1331
1332int eap_peer_aka_register(void)
1333{
1334 struct eap_method *eap;
1335 int ret;
1336
1337 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1338 EAP_VENDOR_IETF, EAP_TYPE_AKA, "AKA");
1339 if (eap == NULL)
1340 return -1;
1341
1342 eap->init = eap_aka_init;
1343 eap->deinit = eap_aka_deinit;
1344 eap->process = eap_aka_process;
1345 eap->isKeyAvailable = eap_aka_isKeyAvailable;
1346 eap->getKey = eap_aka_getKey;
1347 eap->has_reauth_data = eap_aka_has_reauth_data;
1348 eap->deinit_for_reauth = eap_aka_deinit_for_reauth;
1349 eap->init_for_reauth = eap_aka_init_for_reauth;
1350 eap->get_identity = eap_aka_get_identity;
1351 eap->get_emsk = eap_aka_get_emsk;
1352
1353 ret = eap_peer_method_register(eap);
1354 if (ret)
1355 eap_peer_method_free(eap);
1356 return ret;
1357}
a9d1364c
JM		 1358
1359
1360#ifdef EAP_AKA_PRIME
1361int eap_peer_aka_prime_register(void)
1362{
1363 struct eap_method *eap;
1364 int ret;
1365
1366 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1367 EAP_VENDOR_IETF, EAP_TYPE_AKA_PRIME,
1368 "AKA'");
1369 if (eap == NULL)
1370 return -1;
1371
1372 eap->init = eap_aka_prime_init;
1373 eap->deinit = eap_aka_deinit;
1374 eap->process = eap_aka_process;
1375 eap->isKeyAvailable = eap_aka_isKeyAvailable;
1376 eap->getKey = eap_aka_getKey;
1377 eap->has_reauth_data = eap_aka_has_reauth_data;
1378 eap->deinit_for_reauth = eap_aka_deinit_for_reauth;
1379 eap->init_for_reauth = eap_aka_init_for_reauth;
1380 eap->get_identity = eap_aka_get_identity;
1381 eap->get_emsk = eap_aka_get_emsk;
1382
1383 ret = eap_peer_method_register(eap);
1384 if (ret)
1385 eap_peer_method_free(eap);
1386
1387 return ret;
1388}
1389#endif /* EAP_AKA_PRIME */
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