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
eap_aka_state_txt(int state)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
eap_aka_state(struct eap_aka_data * data,int state)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
eap_aka_init(struct eap_sm * sm)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 struct eap_peer_config *config = eap_get_config(sm);
94
95 data = os_zalloc(sizeof(*data));
96 if (data == NULL)
97 return NULL;
98
99 data->eap_method = EAP_TYPE_AKA;
100
101 eap_aka_state(data, CONTINUE);
102 data->prev_id = -1;
103
104 data->result_ind = phase1 && os_strstr(phase1, "result_ind=1") != NULL;
105
106 if (config && config->anonymous_identity) {
107 data->pseudonym = os_malloc(config->anonymous_identity_len);
108 if (data->pseudonym) {
109 os_memcpy(data->pseudonym, config->anonymous_identity,
110 config->anonymous_identity_len);
111 data->pseudonym_len = config->anonymous_identity_len;
112 }
113 }
114
115 return data;
116 }
117
118
119 #ifdef EAP_AKA_PRIME
eap_aka_prime_init(struct eap_sm * sm)120 static void * eap_aka_prime_init(struct eap_sm *sm)
121 {
122 struct eap_aka_data *data = eap_aka_init(sm);
123 if (data == NULL)
124 return NULL;
125 data->eap_method = EAP_TYPE_AKA_PRIME;
126 return data;
127 }
128 #endif /* EAP_AKA_PRIME */
129
130
eap_aka_deinit(struct eap_sm * sm,void * priv)131 static void eap_aka_deinit(struct eap_sm *sm, void *priv)
132 {
133 struct eap_aka_data *data = priv;
134 if (data) {
135 os_free(data->pseudonym);
136 os_free(data->reauth_id);
137 os_free(data->last_eap_identity);
138 wpabuf_free(data->id_msgs);
139 os_free(data->network_name);
140 os_free(data);
141 }
142 }
143
144
eap_aka_umts_auth(struct eap_sm * sm,struct eap_aka_data * data)145 static int eap_aka_umts_auth(struct eap_sm *sm, struct eap_aka_data *data)
146 {
147 struct eap_peer_config *conf;
148
149 wpa_printf(MSG_DEBUG, "EAP-AKA: UMTS authentication algorithm");
150
151 conf = eap_get_config(sm);
152 if (conf == NULL)
153 return -1;
154 if (conf->pcsc) {
155 return scard_umts_auth(sm->scard_ctx, data->rand,
156 data->autn, data->res, &data->res_len,
157 data->ik, data->ck, data->auts);
158 }
159
160 #ifdef CONFIG_USIM_SIMULATOR
161 if (conf->password) {
162 u8 opc[16], k[16], sqn[6];
163 const char *pos;
164 wpa_printf(MSG_DEBUG, "EAP-AKA: Use internal Milenage "
165 "implementation for UMTS authentication");
166 if (conf->password_len < 78) {
167 wpa_printf(MSG_DEBUG, "EAP-AKA: invalid Milenage "
168 "password");
169 return -1;
170 }
171 pos = (const char *) conf->password;
172 if (hexstr2bin(pos, k, 16))
173 return -1;
174 pos += 32;
175 if (*pos != ':')
176 return -1;
177 pos++;
178
179 if (hexstr2bin(pos, opc, 16))
180 return -1;
181 pos += 32;
182 if (*pos != ':')
183 return -1;
184 pos++;
185
186 if (hexstr2bin(pos, sqn, 6))
187 return -1;
188
189 return milenage_check(opc, k, sqn, data->rand, data->autn,
190 data->ik, data->ck,
191 data->res, &data->res_len, data->auts);
192 }
193 #endif /* CONFIG_USIM_SIMULATOR */
194
195 #ifdef CONFIG_USIM_HARDCODED
196 wpa_printf(MSG_DEBUG, "EAP-AKA: Use hardcoded Kc and SRES values for "
197 "testing");
198
199 /* These hardcoded Kc and SRES values are used for testing.
200 * Could consider making them configurable. */
201 os_memset(data->res, '2', EAP_AKA_RES_MAX_LEN);
202 data->res_len = EAP_AKA_RES_MAX_LEN;
203 os_memset(data->ik, '3', EAP_AKA_IK_LEN);
204 os_memset(data->ck, '4', EAP_AKA_CK_LEN);
205 {
206 u8 autn[EAP_AKA_AUTN_LEN];
207 os_memset(autn, '1', EAP_AKA_AUTN_LEN);
208 if (os_memcmp(autn, data->autn, EAP_AKA_AUTN_LEN) != 0) {
209 wpa_printf(MSG_WARNING, "EAP-AKA: AUTN did not match "
210 "with expected value");
211 return -1;
212 }
213 }
214 #if 0
215 {
216 static int test_resync = 1;
217 if (test_resync) {
218 /* Test Resynchronization */
219 test_resync = 0;
220 return -2;
221 }
222 }
223 #endif
224 return 0;
225
226 #else /* CONFIG_USIM_HARDCODED */
227
228 wpa_printf(MSG_DEBUG, "EAP-AKA: No UMTS authentication algorith "
229 "enabled");
230 return -1;
231
232 #endif /* CONFIG_USIM_HARDCODED */
233 }
234
235
236 #define CLEAR_PSEUDONYM 0x01
237 #define CLEAR_REAUTH_ID 0x02
238 #define CLEAR_EAP_ID 0x04
239
eap_aka_clear_identities(struct eap_sm * sm,struct eap_aka_data * data,int id)240 static void eap_aka_clear_identities(struct eap_sm *sm,
241 struct eap_aka_data *data, int id)
242 {
243 if ((id & CLEAR_PSEUDONYM) && data->pseudonym) {
244 wpa_printf(MSG_DEBUG, "EAP-AKA: forgetting old pseudonym");
245 os_free(data->pseudonym);
246 data->pseudonym = NULL;
247 data->pseudonym_len = 0;
248 eap_set_anon_id(sm, NULL, 0);
249 }
250 if ((id & CLEAR_REAUTH_ID) && data->reauth_id) {
251 wpa_printf(MSG_DEBUG, "EAP-AKA: forgetting old reauth_id");
252 os_free(data->reauth_id);
253 data->reauth_id = NULL;
254 data->reauth_id_len = 0;
255 }
256 if ((id & CLEAR_EAP_ID) && data->last_eap_identity) {
257 wpa_printf(MSG_DEBUG, "EAP-AKA: forgetting old eap_id");
258 os_free(data->last_eap_identity);
259 data->last_eap_identity = NULL;
260 data->last_eap_identity_len = 0;
261 }
262 }
263
264
eap_aka_learn_ids(struct eap_sm * sm,struct eap_aka_data * data,struct eap_sim_attrs * attr)265 static int eap_aka_learn_ids(struct eap_sm *sm, struct eap_aka_data *data,
266 struct eap_sim_attrs *attr)
267 {
268 if (attr->next_pseudonym) {
269 const u8 *identity = NULL;
270 size_t identity_len = 0;
271 const u8 *realm = NULL;
272 size_t realm_len = 0;
273
274 wpa_hexdump_ascii(MSG_DEBUG,
275 "EAP-AKA: (encr) AT_NEXT_PSEUDONYM",
276 attr->next_pseudonym,
277 attr->next_pseudonym_len);
278 os_free(data->pseudonym);
279 /* Look for the realm of the permanent identity */
280 identity = eap_get_config_identity(sm, &identity_len);
281 if (identity) {
282 for (realm = identity, realm_len = identity_len;
283 realm_len > 0; realm_len--, realm++) {
284 if (*realm == '@')
285 break;
286 }
287 }
288 data->pseudonym = os_malloc(attr->next_pseudonym_len +
289 realm_len);
290 if (data->pseudonym == NULL) {
291 wpa_printf(MSG_INFO, "EAP-AKA: (encr) No memory for "
292 "next pseudonym");
293 data->pseudonym_len = 0;
294 return -1;
295 }
296 os_memcpy(data->pseudonym, attr->next_pseudonym,
297 attr->next_pseudonym_len);
298 if (realm_len) {
299 os_memcpy(data->pseudonym + attr->next_pseudonym_len,
300 realm, realm_len);
301 }
302 data->pseudonym_len = attr->next_pseudonym_len + realm_len;
303 eap_set_anon_id(sm, data->pseudonym, data->pseudonym_len);
304 }
305
306 if (attr->next_reauth_id) {
307 os_free(data->reauth_id);
308 data->reauth_id = os_malloc(attr->next_reauth_id_len);
309 if (data->reauth_id == NULL) {
310 wpa_printf(MSG_INFO, "EAP-AKA: (encr) No memory for "
311 "next reauth_id");
312 data->reauth_id_len = 0;
313 return -1;
314 }
315 os_memcpy(data->reauth_id, attr->next_reauth_id,
316 attr->next_reauth_id_len);
317 data->reauth_id_len = attr->next_reauth_id_len;
318 wpa_hexdump_ascii(MSG_DEBUG,
319 "EAP-AKA: (encr) AT_NEXT_REAUTH_ID",
320 data->reauth_id,
321 data->reauth_id_len);
322 }
323
324 return 0;
325 }
326
327
eap_aka_add_id_msg(struct eap_aka_data * data,const struct wpabuf * msg)328 static int eap_aka_add_id_msg(struct eap_aka_data *data,
329 const struct wpabuf *msg)
330 {
331 if (msg == NULL)
332 return -1;
333
334 if (data->id_msgs == NULL) {
335 data->id_msgs = wpabuf_dup(msg);
336 return data->id_msgs == NULL ? -1 : 0;
337 }
338
339 if (wpabuf_resize(&data->id_msgs, wpabuf_len(msg)) < 0)
340 return -1;
341 wpabuf_put_buf(data->id_msgs, msg);
342
343 return 0;
344 }
345
346
eap_aka_add_checkcode(struct eap_aka_data * data,struct eap_sim_msg * msg)347 static void eap_aka_add_checkcode(struct eap_aka_data *data,
348 struct eap_sim_msg *msg)
349 {
350 const u8 *addr;
351 size_t len;
352 u8 hash[SHA256_MAC_LEN];
353
354 wpa_printf(MSG_DEBUG, " AT_CHECKCODE");
355
356 if (data->id_msgs == NULL) {
357 /*
358 * No EAP-AKA/Identity packets were exchanged - send empty
359 * checkcode.
360 */
361 eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, NULL, 0);
362 return;
363 }
364
365 /* Checkcode is SHA1/SHA256 hash over all EAP-AKA/Identity packets. */
366 addr = wpabuf_head(data->id_msgs);
367 len = wpabuf_len(data->id_msgs);
368 wpa_hexdump(MSG_MSGDUMP, "EAP-AKA: AT_CHECKCODE data", addr, len);
369 #ifdef EAP_AKA_PRIME
370 if (data->eap_method == EAP_TYPE_AKA_PRIME)
371 sha256_vector(1, &addr, &len, hash);
372 else
373 #endif /* EAP_AKA_PRIME */
374 sha1_vector(1, &addr, &len, hash);
375
376 eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, hash,
377 data->eap_method == EAP_TYPE_AKA_PRIME ?
378 EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN);
379 }
380
381
eap_aka_verify_checkcode(struct eap_aka_data * data,const u8 * checkcode,size_t checkcode_len)382 static int eap_aka_verify_checkcode(struct eap_aka_data *data,
383 const u8 *checkcode, size_t checkcode_len)
384 {
385 const u8 *addr;
386 size_t len;
387 u8 hash[SHA256_MAC_LEN];
388 size_t hash_len;
389
390 if (checkcode == NULL)
391 return -1;
392
393 if (data->id_msgs == NULL) {
394 if (checkcode_len != 0) {
395 wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from server "
396 "indicates that AKA/Identity messages were "
397 "used, but they were not");
398 return -1;
399 }
400 return 0;
401 }
402
403 hash_len = data->eap_method == EAP_TYPE_AKA_PRIME ?
404 EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN;
405
406 if (checkcode_len != hash_len) {
407 wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from server "
408 "indicates that AKA/Identity message were not "
409 "used, but they were");
410 return -1;
411 }
412
413 /* Checkcode is SHA1/SHA256 hash over all EAP-AKA/Identity packets. */
414 addr = wpabuf_head(data->id_msgs);
415 len = wpabuf_len(data->id_msgs);
416 #ifdef EAP_AKA_PRIME
417 if (data->eap_method == EAP_TYPE_AKA_PRIME)
418 sha256_vector(1, &addr, &len, hash);
419 else
420 #endif /* EAP_AKA_PRIME */
421 sha1_vector(1, &addr, &len, hash);
422
423 if (os_memcmp(hash, checkcode, hash_len) != 0) {
424 wpa_printf(MSG_DEBUG, "EAP-AKA: Mismatch in AT_CHECKCODE");
425 return -1;
426 }
427
428 return 0;
429 }
430
431
eap_aka_client_error(struct eap_aka_data * data,u8 id,int err)432 static struct wpabuf * eap_aka_client_error(struct eap_aka_data *data, u8 id,
433 int err)
434 {
435 struct eap_sim_msg *msg;
436
437 eap_aka_state(data, FAILURE);
438 data->num_id_req = 0;
439 data->num_notification = 0;
440
441 wpa_printf(MSG_DEBUG, "EAP-AKA: Send Client-Error (error code %d)",
442 err);
443 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
444 EAP_AKA_SUBTYPE_CLIENT_ERROR);
445 eap_sim_msg_add(msg, EAP_SIM_AT_CLIENT_ERROR_CODE, err, NULL, 0);
446 return eap_sim_msg_finish(msg, NULL, NULL, 0);
447 }
448
449
eap_aka_authentication_reject(struct eap_aka_data * data,u8 id)450 static struct wpabuf * eap_aka_authentication_reject(struct eap_aka_data *data,
451 u8 id)
452 {
453 struct eap_sim_msg *msg;
454
455 eap_aka_state(data, FAILURE);
456 data->num_id_req = 0;
457 data->num_notification = 0;
458
459 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Authentication-Reject "
460 "(id=%d)", id);
461 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
462 EAP_AKA_SUBTYPE_AUTHENTICATION_REJECT);
463 return eap_sim_msg_finish(msg, NULL, NULL, 0);
464 }
465
466
eap_aka_synchronization_failure(struct eap_aka_data * data,u8 id)467 static struct wpabuf * eap_aka_synchronization_failure(
468 struct eap_aka_data *data, u8 id)
469 {
470 struct eap_sim_msg *msg;
471
472 data->num_id_req = 0;
473 data->num_notification = 0;
474
475 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Synchronization-Failure "
476 "(id=%d)", id);
477 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
478 EAP_AKA_SUBTYPE_SYNCHRONIZATION_FAILURE);
479 wpa_printf(MSG_DEBUG, " AT_AUTS");
480 eap_sim_msg_add_full(msg, EAP_SIM_AT_AUTS, data->auts,
481 EAP_AKA_AUTS_LEN);
482 return eap_sim_msg_finish(msg, NULL, NULL, 0);
483 }
484
485
eap_aka_response_identity(struct eap_sm * sm,struct eap_aka_data * data,u8 id,enum eap_sim_id_req id_req)486 static struct wpabuf * eap_aka_response_identity(struct eap_sm *sm,
487 struct eap_aka_data *data,
488 u8 id,
489 enum eap_sim_id_req id_req)
490 {
491 const u8 *identity = NULL;
492 size_t identity_len = 0;
493 struct eap_sim_msg *msg;
494
495 data->reauth = 0;
496 if (id_req == ANY_ID && data->reauth_id) {
497 identity = data->reauth_id;
498 identity_len = data->reauth_id_len;
499 data->reauth = 1;
500 } else if ((id_req == ANY_ID || id_req == FULLAUTH_ID) &&
501 data->pseudonym) {
502 identity = data->pseudonym;
503 identity_len = data->pseudonym_len;
504 eap_aka_clear_identities(sm, data, CLEAR_REAUTH_ID);
505 } else if (id_req != NO_ID_REQ) {
506 identity = eap_get_config_identity(sm, &identity_len);
507 if (identity) {
508 eap_aka_clear_identities(sm, data, CLEAR_PSEUDONYM |
509 CLEAR_REAUTH_ID);
510 }
511 }
512 if (id_req != NO_ID_REQ)
513 eap_aka_clear_identities(sm, data, CLEAR_EAP_ID);
514
515 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Identity (id=%d)", id);
516 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
517 EAP_AKA_SUBTYPE_IDENTITY);
518
519 if (identity) {
520 wpa_hexdump_ascii(MSG_DEBUG, " AT_IDENTITY",
521 identity, identity_len);
522 eap_sim_msg_add(msg, EAP_SIM_AT_IDENTITY, identity_len,
523 identity, identity_len);
524 }
525
526 return eap_sim_msg_finish(msg, NULL, NULL, 0);
527 }
528
529
eap_aka_response_challenge(struct eap_aka_data * data,u8 id)530 static struct wpabuf * eap_aka_response_challenge(struct eap_aka_data *data,
531 u8 id)
532 {
533 struct eap_sim_msg *msg;
534
535 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Challenge (id=%d)", id);
536 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
537 EAP_AKA_SUBTYPE_CHALLENGE);
538 wpa_printf(MSG_DEBUG, " AT_RES");
539 eap_sim_msg_add(msg, EAP_SIM_AT_RES, data->res_len * 8,
540 data->res, data->res_len);
541 eap_aka_add_checkcode(data, msg);
542 if (data->use_result_ind) {
543 wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
544 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
545 }
546 wpa_printf(MSG_DEBUG, " AT_MAC");
547 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
548 return eap_sim_msg_finish(msg, data->k_aut, (u8 *) "", 0);
549 }
550
551
eap_aka_response_reauth(struct eap_aka_data * data,u8 id,int counter_too_small,const u8 * nonce_s)552 static struct wpabuf * eap_aka_response_reauth(struct eap_aka_data *data,
553 u8 id, int counter_too_small,
554 const u8 *nonce_s)
555 {
556 struct eap_sim_msg *msg;
557 unsigned int counter;
558
559 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Reauthentication (id=%d)",
560 id);
561 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
562 EAP_AKA_SUBTYPE_REAUTHENTICATION);
563 wpa_printf(MSG_DEBUG, " AT_IV");
564 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
565 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA);
566
567 if (counter_too_small) {
568 wpa_printf(MSG_DEBUG, " *AT_COUNTER_TOO_SMALL");
569 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER_TOO_SMALL, 0, NULL, 0);
570 counter = data->counter_too_small;
571 } else
572 counter = data->counter;
573
574 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", counter);
575 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0);
576
577 if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) {
578 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to encrypt "
579 "AT_ENCR_DATA");
580 eap_sim_msg_free(msg);
581 return NULL;
582 }
583 eap_aka_add_checkcode(data, msg);
584 if (data->use_result_ind) {
585 wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
586 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
587 }
588 wpa_printf(MSG_DEBUG, " AT_MAC");
589 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
590 return eap_sim_msg_finish(msg, data->k_aut, nonce_s,
591 EAP_SIM_NONCE_S_LEN);
592 }
593
594
eap_aka_response_notification(struct eap_aka_data * data,u8 id,u16 notification)595 static struct wpabuf * eap_aka_response_notification(struct eap_aka_data *data,
596 u8 id, u16 notification)
597 {
598 struct eap_sim_msg *msg;
599 u8 *k_aut = (notification & 0x4000) == 0 ? data->k_aut : NULL;
600
601 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Notification (id=%d)", id);
602 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
603 EAP_AKA_SUBTYPE_NOTIFICATION);
604 if (k_aut && data->reauth) {
605 wpa_printf(MSG_DEBUG, " AT_IV");
606 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
607 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV,
608 EAP_SIM_AT_ENCR_DATA);
609 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", data->counter);
610 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter,
611 NULL, 0);
612 if (eap_sim_msg_add_encr_end(msg, data->k_encr,
613 EAP_SIM_AT_PADDING)) {
614 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to encrypt "
615 "AT_ENCR_DATA");
616 eap_sim_msg_free(msg);
617 return NULL;
618 }
619 }
620 if (k_aut) {
621 wpa_printf(MSG_DEBUG, " AT_MAC");
622 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
623 }
624 return eap_sim_msg_finish(msg, k_aut, (u8 *) "", 0);
625 }
626
627
eap_aka_process_identity(struct eap_sm * sm,struct eap_aka_data * data,u8 id,const struct wpabuf * reqData,struct eap_sim_attrs * attr)628 static struct wpabuf * eap_aka_process_identity(struct eap_sm *sm,
629 struct eap_aka_data *data,
630 u8 id,
631 const struct wpabuf *reqData,
632 struct eap_sim_attrs *attr)
633 {
634 int id_error;
635 struct wpabuf *buf;
636
637 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Identity");
638
639 id_error = 0;
640 switch (attr->id_req) {
641 case NO_ID_REQ:
642 break;
643 case ANY_ID:
644 if (data->num_id_req > 0)
645 id_error++;
646 data->num_id_req++;
647 break;
648 case FULLAUTH_ID:
649 if (data->num_id_req > 1)
650 id_error++;
651 data->num_id_req++;
652 break;
653 case PERMANENT_ID:
654 if (data->num_id_req > 2)
655 id_error++;
656 data->num_id_req++;
657 break;
658 }
659 if (id_error) {
660 wpa_printf(MSG_INFO, "EAP-AKA: Too many ID requests "
661 "used within one authentication");
662 return eap_aka_client_error(data, id,
663 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
664 }
665
666 buf = eap_aka_response_identity(sm, data, id, attr->id_req);
667
668 if (data->prev_id != id) {
669 eap_aka_add_id_msg(data, reqData);
670 eap_aka_add_id_msg(data, buf);
671 data->prev_id = id;
672 }
673
674 return buf;
675 }
676
677
eap_aka_verify_mac(struct eap_aka_data * data,const struct wpabuf * req,const u8 * mac,const u8 * extra,size_t extra_len)678 static int eap_aka_verify_mac(struct eap_aka_data *data,
679 const struct wpabuf *req,
680 const u8 *mac, const u8 *extra,
681 size_t extra_len)
682 {
683 if (data->eap_method == EAP_TYPE_AKA_PRIME)
684 return eap_sim_verify_mac_sha256(data->k_aut, req, mac, extra,
685 extra_len);
686 return eap_sim_verify_mac(data->k_aut, req, mac, extra, extra_len);
687 }
688
689
690 #ifdef EAP_AKA_PRIME
eap_aka_prime_kdf_select(struct eap_aka_data * data,u8 id,u16 kdf)691 static struct wpabuf * eap_aka_prime_kdf_select(struct eap_aka_data *data,
692 u8 id, u16 kdf)
693 {
694 struct eap_sim_msg *msg;
695
696 data->kdf_negotiation = 1;
697 data->kdf = kdf;
698 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Challenge (id=%d) (KDF "
699 "select)", id);
700 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
701 EAP_AKA_SUBTYPE_CHALLENGE);
702 wpa_printf(MSG_DEBUG, " AT_KDF");
703 eap_sim_msg_add(msg, EAP_SIM_AT_KDF, kdf, NULL, 0);
704 return eap_sim_msg_finish(msg, NULL, NULL, 0);
705 }
706
707
eap_aka_prime_kdf_neg(struct eap_aka_data * data,u8 id,struct eap_sim_attrs * attr)708 static struct wpabuf * eap_aka_prime_kdf_neg(struct eap_aka_data *data,
709 u8 id, struct eap_sim_attrs *attr)
710 {
711 size_t i;
712
713 for (i = 0; i < attr->kdf_count; i++) {
714 if (attr->kdf[i] == EAP_AKA_PRIME_KDF)
715 return eap_aka_prime_kdf_select(data, id,
716 EAP_AKA_PRIME_KDF);
717 }
718
719 /* No matching KDF found - fail authentication as if AUTN had been
720 * incorrect */
721 return eap_aka_authentication_reject(data, id);
722 }
723
724
eap_aka_prime_kdf_valid(struct eap_aka_data * data,struct eap_sim_attrs * attr)725 static int eap_aka_prime_kdf_valid(struct eap_aka_data *data,
726 struct eap_sim_attrs *attr)
727 {
728 size_t i, j;
729
730 if (attr->kdf_count == 0)
731 return 0;
732
733 /* The only allowed (and required) duplication of a KDF is the addition
734 * of the selected KDF into the beginning of the list. */
735
736 if (data->kdf_negotiation) {
737 if (attr->kdf[0] != data->kdf) {
738 wpa_printf(MSG_WARNING, "EAP-AKA': The server did not "
739 "accept the selected KDF");
740 return 0;
741 }
742
743 for (i = 1; i < attr->kdf_count; i++) {
744 if (attr->kdf[i] == data->kdf)
745 break;
746 }
747 if (i == attr->kdf_count &&
748 attr->kdf_count < EAP_AKA_PRIME_KDF_MAX) {
749 wpa_printf(MSG_WARNING, "EAP-AKA': The server did not "
750 "duplicate the selected KDF");
751 return 0;
752 }
753
754 /* TODO: should check that the list is identical to the one
755 * used in the previous Challenge message apart from the added
756 * entry in the beginning. */
757 }
758
759 for (i = data->kdf ? 1 : 0; i < attr->kdf_count; i++) {
760 for (j = i + 1; j < attr->kdf_count; j++) {
761 if (attr->kdf[i] == attr->kdf[j]) {
762 wpa_printf(MSG_WARNING, "EAP-AKA': The server "
763 "included a duplicated KDF");
764 return 0;
765 }
766 }
767 }
768
769 return 1;
770 }
771 #endif /* EAP_AKA_PRIME */
772
773
eap_aka_process_challenge(struct eap_sm * sm,struct eap_aka_data * data,u8 id,const struct wpabuf * reqData,struct eap_sim_attrs * attr)774 static struct wpabuf * eap_aka_process_challenge(struct eap_sm *sm,
775 struct eap_aka_data *data,
776 u8 id,
777 const struct wpabuf *reqData,
778 struct eap_sim_attrs *attr)
779 {
780 const u8 *identity;
781 size_t identity_len;
782 int res;
783 struct eap_sim_attrs eattr;
784
785 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Challenge");
786
787 if (attr->checkcode &&
788 eap_aka_verify_checkcode(data, attr->checkcode,
789 attr->checkcode_len)) {
790 wpa_printf(MSG_WARNING, "EAP-AKA: Invalid AT_CHECKCODE in the "
791 "message");
792 return eap_aka_client_error(data, id,
793 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
794 }
795
796 #ifdef EAP_AKA_PRIME
797 if (data->eap_method == EAP_TYPE_AKA_PRIME) {
798 if (!attr->kdf_input || attr->kdf_input_len == 0) {
799 wpa_printf(MSG_WARNING, "EAP-AKA': Challenge message "
800 "did not include non-empty AT_KDF_INPUT");
801 /* Fail authentication as if AUTN had been incorrect */
802 return eap_aka_authentication_reject(data, id);
803 }
804 os_free(data->network_name);
805 data->network_name = os_malloc(attr->kdf_input_len);
806 if (data->network_name == NULL) {
807 wpa_printf(MSG_WARNING, "EAP-AKA': No memory for "
808 "storing Network Name");
809 return eap_aka_authentication_reject(data, id);
810 }
811 os_memcpy(data->network_name, attr->kdf_input,
812 attr->kdf_input_len);
813 data->network_name_len = attr->kdf_input_len;
814 wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA': Network Name "
815 "(AT_KDF_INPUT)",
816 data->network_name, data->network_name_len);
817 /* TODO: check Network Name per 3GPP.33.402 */
818
819 if (!eap_aka_prime_kdf_valid(data, attr))
820 return eap_aka_authentication_reject(data, id);
821
822 if (attr->kdf[0] != EAP_AKA_PRIME_KDF)
823 return eap_aka_prime_kdf_neg(data, id, attr);
824
825 data->kdf = EAP_AKA_PRIME_KDF;
826 wpa_printf(MSG_DEBUG, "EAP-AKA': KDF %d selected", data->kdf);
827 }
828
829 if (data->eap_method == EAP_TYPE_AKA && attr->bidding) {
830 u16 flags = WPA_GET_BE16(attr->bidding);
831 if ((flags & EAP_AKA_BIDDING_FLAG_D) &&
832 eap_allowed_method(sm, EAP_VENDOR_IETF,
833 EAP_TYPE_AKA_PRIME)) {
834 wpa_printf(MSG_WARNING, "EAP-AKA: Bidding down from "
835 "AKA' to AKA detected");
836 /* Fail authentication as if AUTN had been incorrect */
837 return eap_aka_authentication_reject(data, id);
838 }
839 }
840 #endif /* EAP_AKA_PRIME */
841
842 data->reauth = 0;
843 if (!attr->mac || !attr->rand || !attr->autn) {
844 wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message "
845 "did not include%s%s%s",
846 !attr->mac ? " AT_MAC" : "",
847 !attr->rand ? " AT_RAND" : "",
848 !attr->autn ? " AT_AUTN" : "");
849 return eap_aka_client_error(data, id,
850 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
851 }
852 os_memcpy(data->rand, attr->rand, EAP_AKA_RAND_LEN);
853 os_memcpy(data->autn, attr->autn, EAP_AKA_AUTN_LEN);
854
855 res = eap_aka_umts_auth(sm, data);
856 if (res == -1) {
857 wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication "
858 "failed (AUTN)");
859 return eap_aka_authentication_reject(data, id);
860 } else if (res == -2) {
861 wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication "
862 "failed (AUTN seq# -> AUTS)");
863 return eap_aka_synchronization_failure(data, id);
864 } else if (res) {
865 wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication failed");
866 return eap_aka_client_error(data, id,
867 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
868 }
869 #ifdef EAP_AKA_PRIME
870 if (data->eap_method == EAP_TYPE_AKA_PRIME) {
871 /* Note: AUTN = (SQN ^ AK) || AMF || MAC which gives us the
872 * needed 6-octet SQN ^ AK for CK',IK' derivation */
873 u16 amf = WPA_GET_BE16(data->autn + 6);
874 if (!(amf & 0x8000)) {
875 wpa_printf(MSG_WARNING, "EAP-AKA': AMF separation bit "
876 "not set (AMF=0x%4x)", amf);
877 return eap_aka_authentication_reject(data, id);
878 }
879 eap_aka_prime_derive_ck_ik_prime(data->ck, data->ik,
880 data->autn,
881 data->network_name,
882 data->network_name_len);
883 }
884 #endif /* EAP_AKA_PRIME */
885 if (data->last_eap_identity) {
886 identity = data->last_eap_identity;
887 identity_len = data->last_eap_identity_len;
888 } else if (data->pseudonym) {
889 identity = data->pseudonym;
890 identity_len = data->pseudonym_len;
891 } else
892 identity = eap_get_config_identity(sm, &identity_len);
893 wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA: Selected identity for MK "
894 "derivation", identity, identity_len);
895 if (data->eap_method == EAP_TYPE_AKA_PRIME) {
896 eap_aka_prime_derive_keys(identity, identity_len, data->ik,
897 data->ck, data->k_encr, data->k_aut,
898 data->k_re, data->msk, data->emsk);
899 } else {
900 eap_aka_derive_mk(identity, identity_len, data->ik, data->ck,
901 data->mk);
902 eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut,
903 data->msk, data->emsk);
904 }
905 if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
906 wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message "
907 "used invalid AT_MAC");
908 return eap_aka_client_error(data, id,
909 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
910 }
911
912 /* Old reauthentication identity must not be used anymore. In
913 * other words, if no new identities are received, full
914 * authentication will be used on next reauthentication (using
915 * pseudonym identity or permanent identity). */
916 eap_aka_clear_identities(sm, data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
917
918 if (attr->encr_data) {
919 u8 *decrypted;
920 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
921 attr->encr_data_len, attr->iv,
922 &eattr, 0);
923 if (decrypted == NULL) {
924 return eap_aka_client_error(
925 data, id, EAP_AKA_UNABLE_TO_PROCESS_PACKET);
926 }
927 eap_aka_learn_ids(sm, data, &eattr);
928 os_free(decrypted);
929 }
930
931 if (data->result_ind && attr->result_ind)
932 data->use_result_ind = 1;
933
934 if (data->state != FAILURE && data->state != RESULT_FAILURE) {
935 eap_aka_state(data, data->use_result_ind ?
936 RESULT_SUCCESS : SUCCESS);
937 }
938
939 data->num_id_req = 0;
940 data->num_notification = 0;
941 /* RFC 4187 specifies that counter is initialized to one after
942 * fullauth, but initializing it to zero makes it easier to implement
943 * reauth verification. */
944 data->counter = 0;
945 return eap_aka_response_challenge(data, id);
946 }
947
948
eap_aka_process_notification_reauth(struct eap_aka_data * data,struct eap_sim_attrs * attr)949 static int eap_aka_process_notification_reauth(struct eap_aka_data *data,
950 struct eap_sim_attrs *attr)
951 {
952 struct eap_sim_attrs eattr;
953 u8 *decrypted;
954
955 if (attr->encr_data == NULL || attr->iv == NULL) {
956 wpa_printf(MSG_WARNING, "EAP-AKA: Notification message after "
957 "reauth did not include encrypted data");
958 return -1;
959 }
960
961 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
962 attr->encr_data_len, attr->iv, &eattr,
963 0);
964 if (decrypted == NULL) {
965 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to parse encrypted "
966 "data from notification message");
967 return -1;
968 }
969
970 if (eattr.counter < 0 || (size_t) eattr.counter != data->counter) {
971 wpa_printf(MSG_WARNING, "EAP-AKA: Counter in notification "
972 "message does not match with counter in reauth "
973 "message");
974 os_free(decrypted);
975 return -1;
976 }
977
978 os_free(decrypted);
979 return 0;
980 }
981
982
eap_aka_process_notification_auth(struct eap_aka_data * data,const struct wpabuf * reqData,struct eap_sim_attrs * attr)983 static int eap_aka_process_notification_auth(struct eap_aka_data *data,
984 const struct wpabuf *reqData,
985 struct eap_sim_attrs *attr)
986 {
987 if (attr->mac == NULL) {
988 wpa_printf(MSG_INFO, "EAP-AKA: no AT_MAC in after_auth "
989 "Notification message");
990 return -1;
991 }
992
993 if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
994 wpa_printf(MSG_WARNING, "EAP-AKA: Notification message "
995 "used invalid AT_MAC");
996 return -1;
997 }
998
999 if (data->reauth &&
1000 eap_aka_process_notification_reauth(data, attr)) {
1001 wpa_printf(MSG_WARNING, "EAP-AKA: Invalid notification "
1002 "message after reauth");
1003 return -1;
1004 }
1005
1006 return 0;
1007 }
1008
1009
eap_aka_process_notification(struct eap_sm * sm,struct eap_aka_data * data,u8 id,const struct wpabuf * reqData,struct eap_sim_attrs * attr)1010 static struct wpabuf * eap_aka_process_notification(
1011 struct eap_sm *sm, struct eap_aka_data *data, u8 id,
1012 const struct wpabuf *reqData, struct eap_sim_attrs *attr)
1013 {
1014 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Notification");
1015 if (data->num_notification > 0) {
1016 wpa_printf(MSG_INFO, "EAP-AKA: too many notification "
1017 "rounds (only one allowed)");
1018 return eap_aka_client_error(data, id,
1019 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1020 }
1021 data->num_notification++;
1022 if (attr->notification == -1) {
1023 wpa_printf(MSG_INFO, "EAP-AKA: no AT_NOTIFICATION in "
1024 "Notification message");
1025 return eap_aka_client_error(data, id,
1026 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1027 }
1028
1029 if ((attr->notification & 0x4000) == 0 &&
1030 eap_aka_process_notification_auth(data, reqData, attr)) {
1031 return eap_aka_client_error(data, id,
1032 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1033 }
1034
1035 eap_sim_report_notification(sm->msg_ctx, attr->notification, 1);
1036 if (attr->notification >= 0 && attr->notification < 32768) {
1037 eap_aka_state(data, FAILURE);
1038 } else if (attr->notification == EAP_SIM_SUCCESS &&
1039 data->state == RESULT_SUCCESS)
1040 eap_aka_state(data, SUCCESS);
1041 return eap_aka_response_notification(data, id, attr->notification);
1042 }
1043
1044
eap_aka_process_reauthentication(struct eap_sm * sm,struct eap_aka_data * data,u8 id,const struct wpabuf * reqData,struct eap_sim_attrs * attr)1045 static struct wpabuf * eap_aka_process_reauthentication(
1046 struct eap_sm *sm, struct eap_aka_data *data, u8 id,
1047 const struct wpabuf *reqData, struct eap_sim_attrs *attr)
1048 {
1049 struct eap_sim_attrs eattr;
1050 u8 *decrypted;
1051
1052 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Reauthentication");
1053
1054 if (attr->checkcode &&
1055 eap_aka_verify_checkcode(data, attr->checkcode,
1056 attr->checkcode_len)) {
1057 wpa_printf(MSG_WARNING, "EAP-AKA: Invalid AT_CHECKCODE in the "
1058 "message");
1059 return eap_aka_client_error(data, id,
1060 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1061 }
1062
1063 if (data->reauth_id == NULL) {
1064 wpa_printf(MSG_WARNING, "EAP-AKA: Server is trying "
1065 "reauthentication, but no reauth_id available");
1066 return eap_aka_client_error(data, id,
1067 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1068 }
1069
1070 data->reauth = 1;
1071 if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
1072 wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication "
1073 "did not have valid AT_MAC");
1074 return eap_aka_client_error(data, id,
1075 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1076 }
1077
1078 if (attr->encr_data == NULL || attr->iv == NULL) {
1079 wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication "
1080 "message did not include encrypted data");
1081 return eap_aka_client_error(data, id,
1082 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1083 }
1084
1085 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
1086 attr->encr_data_len, attr->iv, &eattr,
1087 0);
1088 if (decrypted == NULL) {
1089 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to parse encrypted "
1090 "data from reauthentication message");
1091 return eap_aka_client_error(data, id,
1092 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1093 }
1094
1095 if (eattr.nonce_s == NULL || eattr.counter < 0) {
1096 wpa_printf(MSG_INFO, "EAP-AKA: (encr) No%s%s in reauth packet",
1097 !eattr.nonce_s ? " AT_NONCE_S" : "",
1098 eattr.counter < 0 ? " AT_COUNTER" : "");
1099 os_free(decrypted);
1100 return eap_aka_client_error(data, id,
1101 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1102 }
1103
1104 if (eattr.counter < 0 || (size_t) eattr.counter <= data->counter) {
1105 struct wpabuf *res;
1106 wpa_printf(MSG_INFO, "EAP-AKA: (encr) Invalid counter "
1107 "(%d <= %d)", eattr.counter, data->counter);
1108 data->counter_too_small = eattr.counter;
1109
1110 /* Reply using Re-auth w/ AT_COUNTER_TOO_SMALL. The current
1111 * reauth_id must not be used to start a new reauthentication.
1112 * However, since it was used in the last EAP-Response-Identity
1113 * packet, it has to saved for the following fullauth to be
1114 * used in MK derivation. */
1115 os_free(data->last_eap_identity);
1116 data->last_eap_identity = data->reauth_id;
1117 data->last_eap_identity_len = data->reauth_id_len;
1118 data->reauth_id = NULL;
1119 data->reauth_id_len = 0;
1120
1121 res = eap_aka_response_reauth(data, id, 1, eattr.nonce_s);
1122 os_free(decrypted);
1123
1124 return res;
1125 }
1126 data->counter = eattr.counter;
1127
1128 os_memcpy(data->nonce_s, eattr.nonce_s, EAP_SIM_NONCE_S_LEN);
1129 wpa_hexdump(MSG_DEBUG, "EAP-AKA: (encr) AT_NONCE_S",
1130 data->nonce_s, EAP_SIM_NONCE_S_LEN);
1131
1132 if (data->eap_method == EAP_TYPE_AKA_PRIME) {
1133 eap_aka_prime_derive_keys_reauth(data->k_re, data->counter,
1134 data->reauth_id,
1135 data->reauth_id_len,
1136 data->nonce_s,
1137 data->msk, data->emsk);
1138 } else {
1139 eap_sim_derive_keys_reauth(data->counter, data->reauth_id,
1140 data->reauth_id_len,
1141 data->nonce_s, data->mk,
1142 data->msk, data->emsk);
1143 }
1144 eap_aka_clear_identities(sm, data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
1145 eap_aka_learn_ids(sm, data, &eattr);
1146
1147 if (data->result_ind && attr->result_ind)
1148 data->use_result_ind = 1;
1149
1150 if (data->state != FAILURE && data->state != RESULT_FAILURE) {
1151 eap_aka_state(data, data->use_result_ind ?
1152 RESULT_SUCCESS : SUCCESS);
1153 }
1154
1155 data->num_id_req = 0;
1156 data->num_notification = 0;
1157 if (data->counter > EAP_AKA_MAX_FAST_REAUTHS) {
1158 wpa_printf(MSG_DEBUG, "EAP-AKA: Maximum number of "
1159 "fast reauths performed - force fullauth");
1160 eap_aka_clear_identities(sm, data,
1161 CLEAR_REAUTH_ID | CLEAR_EAP_ID);
1162 }
1163 os_free(decrypted);
1164 return eap_aka_response_reauth(data, id, 0, data->nonce_s);
1165 }
1166
1167
eap_aka_process(struct eap_sm * sm,void * priv,struct eap_method_ret * ret,const struct wpabuf * reqData)1168 static struct wpabuf * eap_aka_process(struct eap_sm *sm, void *priv,
1169 struct eap_method_ret *ret,
1170 const struct wpabuf *reqData)
1171 {
1172 struct eap_aka_data *data = priv;
1173 const struct eap_hdr *req;
1174 u8 subtype, id;
1175 struct wpabuf *res;
1176 const u8 *pos;
1177 struct eap_sim_attrs attr;
1178 size_t len;
1179
1180 wpa_hexdump_buf(MSG_DEBUG, "EAP-AKA: EAP data", reqData);
1181 if (eap_get_config_identity(sm, &len) == NULL) {
1182 wpa_printf(MSG_INFO, "EAP-AKA: Identity not configured");
1183 eap_sm_request_identity(sm);
1184 ret->ignore = TRUE;
1185 return NULL;
1186 }
1187
1188 pos = eap_hdr_validate(EAP_VENDOR_IETF, data->eap_method, reqData,
1189 &len);
1190 if (pos == NULL || len < 1) {
1191 ret->ignore = TRUE;
1192 return NULL;
1193 }
1194 req = wpabuf_head(reqData);
1195 id = req->identifier;
1196 len = be_to_host16(req->length);
1197
1198 ret->ignore = FALSE;
1199 ret->methodState = METHOD_MAY_CONT;
1200 ret->decision = DECISION_FAIL;
1201 ret->allowNotifications = TRUE;
1202
1203 subtype = *pos++;
1204 wpa_printf(MSG_DEBUG, "EAP-AKA: Subtype=%d", subtype);
1205 pos += 2; /* Reserved */
1206
1207 if (eap_sim_parse_attr(pos, wpabuf_head_u8(reqData) + len, &attr,
1208 data->eap_method == EAP_TYPE_AKA_PRIME ? 2 : 1,
1209 0)) {
1210 res = eap_aka_client_error(data, id,
1211 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1212 goto done;
1213 }
1214
1215 switch (subtype) {
1216 case EAP_AKA_SUBTYPE_IDENTITY:
1217 res = eap_aka_process_identity(sm, data, id, reqData, &attr);
1218 break;
1219 case EAP_AKA_SUBTYPE_CHALLENGE:
1220 res = eap_aka_process_challenge(sm, data, id, reqData, &attr);
1221 break;
1222 case EAP_AKA_SUBTYPE_NOTIFICATION:
1223 res = eap_aka_process_notification(sm, data, id, reqData,
1224 &attr);
1225 break;
1226 case EAP_AKA_SUBTYPE_REAUTHENTICATION:
1227 res = eap_aka_process_reauthentication(sm, data, id, reqData,
1228 &attr);
1229 break;
1230 case EAP_AKA_SUBTYPE_CLIENT_ERROR:
1231 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Client-Error");
1232 res = eap_aka_client_error(data, id,
1233 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1234 break;
1235 default:
1236 wpa_printf(MSG_DEBUG, "EAP-AKA: Unknown subtype=%d", subtype);
1237 res = eap_aka_client_error(data, id,
1238 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1239 break;
1240 }
1241
1242 done:
1243 if (data->state == FAILURE) {
1244 ret->decision = DECISION_FAIL;
1245 ret->methodState = METHOD_DONE;
1246 } else if (data->state == SUCCESS) {
1247 ret->decision = data->use_result_ind ?
1248 DECISION_UNCOND_SUCC : DECISION_COND_SUCC;
1249 /*
1250 * It is possible for the server to reply with AKA
1251 * Notification, so we must allow the method to continue and
1252 * not only accept EAP-Success at this point.
1253 */
1254 ret->methodState = data->use_result_ind ?
1255 METHOD_DONE : METHOD_MAY_CONT;
1256 } else if (data->state == RESULT_FAILURE)
1257 ret->methodState = METHOD_CONT;
1258 else if (data->state == RESULT_SUCCESS)
1259 ret->methodState = METHOD_CONT;
1260
1261 if (ret->methodState == METHOD_DONE) {
1262 ret->allowNotifications = FALSE;
1263 }
1264
1265 return res;
1266 }
1267
1268
eap_aka_has_reauth_data(struct eap_sm * sm,void * priv)1269 static Boolean eap_aka_has_reauth_data(struct eap_sm *sm, void *priv)
1270 {
1271 struct eap_aka_data *data = priv;
1272 return data->pseudonym || data->reauth_id;
1273 }
1274
1275
eap_aka_deinit_for_reauth(struct eap_sm * sm,void * priv)1276 static void eap_aka_deinit_for_reauth(struct eap_sm *sm, void *priv)
1277 {
1278 struct eap_aka_data *data = priv;
1279 eap_aka_clear_identities(sm, data, CLEAR_EAP_ID);
1280 data->prev_id = -1;
1281 wpabuf_free(data->id_msgs);
1282 data->id_msgs = NULL;
1283 data->use_result_ind = 0;
1284 data->kdf_negotiation = 0;
1285 }
1286
1287
eap_aka_init_for_reauth(struct eap_sm * sm,void * priv)1288 static void * eap_aka_init_for_reauth(struct eap_sm *sm, void *priv)
1289 {
1290 struct eap_aka_data *data = priv;
1291 data->num_id_req = 0;
1292 data->num_notification = 0;
1293 eap_aka_state(data, CONTINUE);
1294 return priv;
1295 }
1296
1297
eap_aka_get_identity(struct eap_sm * sm,void * priv,size_t * len)1298 static const u8 * eap_aka_get_identity(struct eap_sm *sm, void *priv,
1299 size_t *len)
1300 {
1301 struct eap_aka_data *data = priv;
1302
1303 if (data->reauth_id) {
1304 *len = data->reauth_id_len;
1305 return data->reauth_id;
1306 }
1307
1308 if (data->pseudonym) {
1309 *len = data->pseudonym_len;
1310 return data->pseudonym;
1311 }
1312
1313 return NULL;
1314 }
1315
1316
eap_aka_isKeyAvailable(struct eap_sm * sm,void * priv)1317 static Boolean eap_aka_isKeyAvailable(struct eap_sm *sm, void *priv)
1318 {
1319 struct eap_aka_data *data = priv;
1320 return data->state == SUCCESS;
1321 }
1322
1323
eap_aka_getKey(struct eap_sm * sm,void * priv,size_t * len)1324 static u8 * eap_aka_getKey(struct eap_sm *sm, void *priv, size_t *len)
1325 {
1326 struct eap_aka_data *data = priv;
1327 u8 *key;
1328
1329 if (data->state != SUCCESS)
1330 return NULL;
1331
1332 key = os_malloc(EAP_SIM_KEYING_DATA_LEN);
1333 if (key == NULL)
1334 return NULL;
1335
1336 *len = EAP_SIM_KEYING_DATA_LEN;
1337 os_memcpy(key, data->msk, EAP_SIM_KEYING_DATA_LEN);
1338
1339 return key;
1340 }
1341
1342
eap_aka_get_session_id(struct eap_sm * sm,void * priv,size_t * len)1343 static u8 * eap_aka_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1344 {
1345 struct eap_aka_data *data = priv;
1346 u8 *id;
1347
1348 if (data->state != SUCCESS)
1349 return NULL;
1350
1351 *len = 1 + EAP_AKA_RAND_LEN + EAP_AKA_AUTN_LEN;
1352 id = os_malloc(*len);
1353 if (id == NULL)
1354 return NULL;
1355
1356 id[0] = data->eap_method;
1357 os_memcpy(id + 1, data->rand, EAP_AKA_RAND_LEN);
1358 os_memcpy(id + 1 + EAP_AKA_RAND_LEN, data->autn, EAP_AKA_AUTN_LEN);
1359 wpa_hexdump(MSG_DEBUG, "EAP-AKA: Derived Session-Id", id, *len);
1360
1361 return id;
1362 }
1363
1364
eap_aka_get_emsk(struct eap_sm * sm,void * priv,size_t * len)1365 static u8 * eap_aka_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1366 {
1367 struct eap_aka_data *data = priv;
1368 u8 *key;
1369
1370 if (data->state != SUCCESS)
1371 return NULL;
1372
1373 key = os_malloc(EAP_EMSK_LEN);
1374 if (key == NULL)
1375 return NULL;
1376
1377 *len = EAP_EMSK_LEN;
1378 os_memcpy(key, data->emsk, EAP_EMSK_LEN);
1379
1380 return key;
1381 }
1382
1383
eap_peer_aka_register(void)1384 int eap_peer_aka_register(void)
1385 {
1386 struct eap_method *eap;
1387 int ret;
1388
1389 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1390 EAP_VENDOR_IETF, EAP_TYPE_AKA, "AKA");
1391 if (eap == NULL)
1392 return -1;
1393
1394 eap->init = eap_aka_init;
1395 eap->deinit = eap_aka_deinit;
1396 eap->process = eap_aka_process;
1397 eap->isKeyAvailable = eap_aka_isKeyAvailable;
1398 eap->getKey = eap_aka_getKey;
1399 eap->getSessionId = eap_aka_get_session_id;
1400 eap->has_reauth_data = eap_aka_has_reauth_data;
1401 eap->deinit_for_reauth = eap_aka_deinit_for_reauth;
1402 eap->init_for_reauth = eap_aka_init_for_reauth;
1403 eap->get_identity = eap_aka_get_identity;
1404 eap->get_emsk = eap_aka_get_emsk;
1405
1406 ret = eap_peer_method_register(eap);
1407 if (ret)
1408 eap_peer_method_free(eap);
1409 return ret;
1410 }
1411
1412
1413 #ifdef EAP_AKA_PRIME
eap_peer_aka_prime_register(void)1414 int eap_peer_aka_prime_register(void)
1415 {
1416 struct eap_method *eap;
1417 int ret;
1418
1419 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1420 EAP_VENDOR_IETF, EAP_TYPE_AKA_PRIME,
1421 "AKA'");
1422 if (eap == NULL)
1423 return -1;
1424
1425 eap->init = eap_aka_prime_init;
1426 eap->deinit = eap_aka_deinit;
1427 eap->process = eap_aka_process;
1428 eap->isKeyAvailable = eap_aka_isKeyAvailable;
1429 eap->getKey = eap_aka_getKey;
1430 eap->getSessionId = eap_aka_get_session_id;
1431 eap->has_reauth_data = eap_aka_has_reauth_data;
1432 eap->deinit_for_reauth = eap_aka_deinit_for_reauth;
1433 eap->init_for_reauth = eap_aka_init_for_reauth;
1434 eap->get_identity = eap_aka_get_identity;
1435 eap->get_emsk = eap_aka_get_emsk;
1436
1437 ret = eap_peer_method_register(eap);
1438 if (ret)
1439 eap_peer_method_free(eap);
1440
1441 return ret;
1442 }
1443 #endif /* EAP_AKA_PRIME */
1444