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 u8 reauth_mac[EAP_SIM_MAC_LEN];
35
36 int num_id_req, num_notification;
37 u8 *pseudonym;
38 size_t pseudonym_len;
39 u8 *reauth_id;
40 size_t reauth_id_len;
41 int reauth;
42 unsigned int counter, counter_too_small;
43 u8 *last_eap_identity;
44 size_t last_eap_identity_len;
45 enum {
46 CONTINUE, RESULT_SUCCESS, SUCCESS, FAILURE
47 } state;
48
49 struct wpabuf *id_msgs;
50 int prev_id;
51 int result_ind, use_result_ind;
52 int use_pseudonym;
53 u8 eap_method;
54 u8 *network_name;
55 size_t network_name_len;
56 u16 kdf;
57 int kdf_negotiation;
58 u16 last_kdf_attrs[EAP_AKA_PRIME_KDF_MAX];
59 size_t last_kdf_count;
60 int error_code;
61 };
62
63
64 #ifndef CONFIG_NO_STDOUT_DEBUG
eap_aka_state_txt(int state)65 static const char * eap_aka_state_txt(int state)
66 {
67 switch (state) {
68 case CONTINUE:
69 return "CONTINUE";
70 case RESULT_SUCCESS:
71 return "RESULT_SUCCESS";
72 case SUCCESS:
73 return "SUCCESS";
74 case FAILURE:
75 return "FAILURE";
76 default:
77 return "?";
78 }
79 }
80 #endif /* CONFIG_NO_STDOUT_DEBUG */
81
82
eap_aka_state(struct eap_aka_data * data,int state)83 static void eap_aka_state(struct eap_aka_data *data, int state)
84 {
85 wpa_printf(MSG_DEBUG, "EAP-AKA: %s -> %s",
86 eap_aka_state_txt(data->state),
87 eap_aka_state_txt(state));
88 data->state = state;
89 }
90
91
eap_aka_init(struct eap_sm * sm)92 static void * eap_aka_init(struct eap_sm *sm)
93 {
94 struct eap_aka_data *data;
95 const char *phase1 = eap_get_config_phase1(sm);
96 struct eap_peer_config *config = eap_get_config(sm);
97
98 data = os_zalloc(sizeof(*data));
99 if (data == NULL)
100 return NULL;
101
102 data->eap_method = EAP_TYPE_AKA;
103
104 /* Zero is a valid error code, so we need to initialize */
105 data->error_code = NO_EAP_METHOD_ERROR;
106
107 eap_aka_state(data, CONTINUE);
108 data->prev_id = -1;
109
110 data->result_ind = phase1 && os_strstr(phase1, "result_ind=1") != NULL;
111
112 data->use_pseudonym = !sm->init_phase2;
113 if (config && config->anonymous_identity && data->use_pseudonym) {
114 data->pseudonym = os_malloc(config->anonymous_identity_len);
115 if (data->pseudonym) {
116 os_memcpy(data->pseudonym, config->anonymous_identity,
117 config->anonymous_identity_len);
118 data->pseudonym_len = config->anonymous_identity_len;
119 }
120 }
121
122 return data;
123 }
124
125
126 #ifdef EAP_AKA_PRIME
eap_aka_prime_init(struct eap_sm * sm)127 static void * eap_aka_prime_init(struct eap_sm *sm)
128 {
129 struct eap_aka_data *data = eap_aka_init(sm);
130 if (data == NULL)
131 return NULL;
132 data->eap_method = EAP_TYPE_AKA_PRIME;
133 return data;
134 }
135 #endif /* EAP_AKA_PRIME */
136
137
eap_aka_clear_keys(struct eap_aka_data * data,int reauth)138 static void eap_aka_clear_keys(struct eap_aka_data *data, int reauth)
139 {
140 if (!reauth) {
141 os_memset(data->mk, 0, EAP_SIM_MK_LEN);
142 os_memset(data->k_aut, 0, EAP_AKA_PRIME_K_AUT_LEN);
143 os_memset(data->k_encr, 0, EAP_SIM_K_ENCR_LEN);
144 os_memset(data->k_re, 0, EAP_AKA_PRIME_K_RE_LEN);
145 }
146 os_memset(data->msk, 0, EAP_SIM_KEYING_DATA_LEN);
147 os_memset(data->emsk, 0, EAP_EMSK_LEN);
148 os_memset(data->autn, 0, EAP_AKA_AUTN_LEN);
149 os_memset(data->auts, 0, EAP_AKA_AUTS_LEN);
150 }
151
152
eap_aka_deinit(struct eap_sm * sm,void * priv)153 static void eap_aka_deinit(struct eap_sm *sm, void *priv)
154 {
155 struct eap_aka_data *data = priv;
156 if (data) {
157 os_free(data->pseudonym);
158 os_free(data->reauth_id);
159 os_free(data->last_eap_identity);
160 wpabuf_free(data->id_msgs);
161 os_free(data->network_name);
162 eap_aka_clear_keys(data, 0);
163 os_free(data);
164 }
165 }
166
167
eap_aka_ext_sim_req(struct eap_sm * sm,struct eap_aka_data * data)168 static int eap_aka_ext_sim_req(struct eap_sm *sm, struct eap_aka_data *data)
169 {
170 char req[200], *pos, *end;
171
172 wpa_printf(MSG_DEBUG, "EAP-AKA: Use external USIM processing");
173 pos = req;
174 end = pos + sizeof(req);
175 pos += os_snprintf(pos, end - pos, "UMTS-AUTH");
176 pos += os_snprintf(pos, end - pos, ":");
177 pos += wpa_snprintf_hex(pos, end - pos, data->rand, EAP_AKA_RAND_LEN);
178 pos += os_snprintf(pos, end - pos, ":");
179 wpa_snprintf_hex(pos, end - pos, data->autn, EAP_AKA_AUTN_LEN);
180
181 eap_sm_request_sim(sm, req);
182 return 1;
183 }
184
185
eap_aka_ext_sim_result(struct eap_sm * sm,struct eap_aka_data * data,struct eap_peer_config * conf)186 static int eap_aka_ext_sim_result(struct eap_sm *sm, struct eap_aka_data *data,
187 struct eap_peer_config *conf)
188 {
189 char *resp, *pos;
190
191 wpa_printf(MSG_DEBUG,
192 "EAP-AKA: Use result from external USIM processing");
193
194 resp = conf->external_sim_resp;
195 conf->external_sim_resp = NULL;
196
197 if (os_strncmp(resp, "UMTS-AUTS:", 10) == 0) {
198 pos = resp + 10;
199 if (hexstr2bin(pos, data->auts, EAP_AKA_AUTS_LEN) < 0)
200 goto invalid;
201 wpa_hexdump_key(MSG_DEBUG, "EAP-AKA: AUTS", data->auts,
202 EAP_AKA_AUTS_LEN);
203 os_free(resp);
204 return -2;
205 }
206
207 if (os_strncmp(resp, "UMTS-AUTH:", 10) != 0) {
208 wpa_printf(MSG_DEBUG, "EAP-AKA: Unrecognized external USIM processing response");
209 os_free(resp);
210 return -1;
211 }
212
213 pos = resp + 10;
214 wpa_hexdump(MSG_DEBUG, "EAP-AKA: RAND", data->rand, EAP_AKA_RAND_LEN);
215
216 if (hexstr2bin(pos, data->ik, EAP_AKA_IK_LEN) < 0)
217 goto invalid;
218 wpa_hexdump_key(MSG_DEBUG, "EAP-AKA: IK", data->ik, EAP_AKA_IK_LEN);
219 pos += EAP_AKA_IK_LEN * 2;
220 if (*pos != ':')
221 goto invalid;
222 pos++;
223
224 if (hexstr2bin(pos, data->ck, EAP_AKA_CK_LEN) < 0)
225 goto invalid;
226 wpa_hexdump_key(MSG_DEBUG, "EAP-AKA: CK", data->ck, EAP_AKA_CK_LEN);
227 pos += EAP_AKA_CK_LEN * 2;
228 if (*pos != ':')
229 goto invalid;
230 pos++;
231
232 data->res_len = os_strlen(pos) / 2;
233 if (data->res_len > EAP_AKA_RES_MAX_LEN) {
234 data->res_len = 0;
235 goto invalid;
236 }
237 if (hexstr2bin(pos, data->res, data->res_len) < 0)
238 goto invalid;
239 wpa_hexdump_key(MSG_DEBUG, "EAP-AKA: RES", data->res, data->res_len);
240
241 os_free(resp);
242 return 0;
243
244 invalid:
245 wpa_printf(MSG_DEBUG, "EAP-AKA: Invalid external USIM processing UMTS-AUTH response");
246 os_free(resp);
247 return -1;
248 }
249
250
eap_aka_umts_auth(struct eap_sm * sm,struct eap_aka_data * data)251 static int eap_aka_umts_auth(struct eap_sm *sm, struct eap_aka_data *data)
252 {
253 struct eap_peer_config *conf;
254
255 wpa_printf(MSG_DEBUG, "EAP-AKA: UMTS authentication algorithm");
256
257 conf = eap_get_config(sm);
258 if (conf == NULL)
259 return -1;
260
261 if (sm->external_sim) {
262 if (conf->external_sim_resp)
263 return eap_aka_ext_sim_result(sm, data, conf);
264 else
265 return eap_aka_ext_sim_req(sm, data);
266 }
267
268 if (conf->pcsc) {
269 return scard_umts_auth(sm->scard_ctx, data->rand,
270 data->autn, data->res, &data->res_len,
271 data->ik, data->ck, data->auts);
272 }
273
274 #ifdef CONFIG_USIM_SIMULATOR
275 if (conf->password) {
276 u8 opc[16], k[16], sqn[6];
277 const char *pos;
278 wpa_printf(MSG_DEBUG, "EAP-AKA: Use internal Milenage "
279 "implementation for UMTS authentication");
280 if (conf->password_len < 78) {
281 wpa_printf(MSG_DEBUG, "EAP-AKA: invalid Milenage "
282 "password");
283 return -1;
284 }
285 pos = (const char *) conf->password;
286 if (hexstr2bin(pos, k, 16))
287 return -1;
288 pos += 32;
289 if (*pos != ':')
290 return -1;
291 pos++;
292
293 if (hexstr2bin(pos, opc, 16))
294 return -1;
295 pos += 32;
296 if (*pos != ':')
297 return -1;
298 pos++;
299
300 if (hexstr2bin(pos, sqn, 6))
301 return -1;
302
303 return milenage_check(opc, k, sqn, data->rand, data->autn,
304 data->ik, data->ck,
305 data->res, &data->res_len, data->auts);
306 }
307 #endif /* CONFIG_USIM_SIMULATOR */
308
309 #ifdef CONFIG_USIM_HARDCODED
310 wpa_printf(MSG_DEBUG, "EAP-AKA: Use hardcoded Kc and SRES values for "
311 "testing");
312
313 /* These hardcoded Kc and SRES values are used for testing.
314 * Could consider making them configurable. */
315 os_memset(data->res, '2', EAP_AKA_RES_MAX_LEN);
316 data->res_len = EAP_AKA_RES_MAX_LEN;
317 os_memset(data->ik, '3', EAP_AKA_IK_LEN);
318 os_memset(data->ck, '4', EAP_AKA_CK_LEN);
319 {
320 u8 autn[EAP_AKA_AUTN_LEN];
321 os_memset(autn, '1', EAP_AKA_AUTN_LEN);
322 if (os_memcmp_const(autn, data->autn, EAP_AKA_AUTN_LEN) != 0) {
323 wpa_printf(MSG_WARNING, "EAP-AKA: AUTN did not match "
324 "with expected value");
325 return -1;
326 }
327 }
328 #if 0
329 {
330 static int test_resync = 1;
331 if (test_resync) {
332 /* Test Resynchronization */
333 test_resync = 0;
334 return -2;
335 }
336 }
337 #endif
338 return 0;
339
340 #else /* CONFIG_USIM_HARDCODED */
341
342 wpa_printf(MSG_DEBUG, "EAP-AKA: No UMTS authentication algorithm "
343 "enabled");
344 return -1;
345
346 #endif /* CONFIG_USIM_HARDCODED */
347 }
348
349
350 #define CLEAR_PSEUDONYM 0x01
351 #define CLEAR_REAUTH_ID 0x02
352 #define CLEAR_EAP_ID 0x04
353
eap_aka_clear_identities(struct eap_sm * sm,struct eap_aka_data * data,int id)354 static void eap_aka_clear_identities(struct eap_sm *sm,
355 struct eap_aka_data *data, int id)
356 {
357 if ((id & CLEAR_PSEUDONYM) && data->pseudonym) {
358 wpa_printf(MSG_DEBUG, "EAP-AKA: forgetting old pseudonym");
359 os_free(data->pseudonym);
360 data->pseudonym = NULL;
361 data->pseudonym_len = 0;
362 if (data->use_pseudonym)
363 eap_set_anon_id(sm, NULL, 0);
364 }
365 if ((id & CLEAR_REAUTH_ID) && data->reauth_id) {
366 wpa_printf(MSG_DEBUG, "EAP-AKA: forgetting old reauth_id");
367 os_free(data->reauth_id);
368 data->reauth_id = NULL;
369 data->reauth_id_len = 0;
370 }
371 if ((id & CLEAR_EAP_ID) && data->last_eap_identity) {
372 wpa_printf(MSG_DEBUG, "EAP-AKA: forgetting old eap_id");
373 os_free(data->last_eap_identity);
374 data->last_eap_identity = NULL;
375 data->last_eap_identity_len = 0;
376 }
377 }
378
379
eap_aka_learn_ids(struct eap_sm * sm,struct eap_aka_data * data,struct eap_sim_attrs * attr)380 static int eap_aka_learn_ids(struct eap_sm *sm, struct eap_aka_data *data,
381 struct eap_sim_attrs *attr)
382 {
383 if (attr->next_pseudonym) {
384 const u8 *identity = NULL;
385 size_t identity_len = 0;
386 const u8 *realm = NULL;
387 size_t realm_len = 0;
388
389 wpa_hexdump_ascii(MSG_DEBUG,
390 "EAP-AKA: (encr) AT_NEXT_PSEUDONYM",
391 attr->next_pseudonym,
392 attr->next_pseudonym_len);
393 os_free(data->pseudonym);
394 /* Look for the realm of the permanent identity */
395 identity = eap_get_config_identity(sm, &identity_len);
396 if (identity) {
397 for (realm = identity, realm_len = identity_len;
398 realm_len > 0; realm_len--, realm++) {
399 if (*realm == '@')
400 break;
401 }
402 }
403 data->pseudonym = os_malloc(attr->next_pseudonym_len +
404 realm_len);
405 if (data->pseudonym == NULL) {
406 wpa_printf(MSG_INFO, "EAP-AKA: (encr) No memory for "
407 "next pseudonym");
408 data->pseudonym_len = 0;
409 return -1;
410 }
411 os_memcpy(data->pseudonym, attr->next_pseudonym,
412 attr->next_pseudonym_len);
413 if (realm_len) {
414 os_memcpy(data->pseudonym + attr->next_pseudonym_len,
415 realm, realm_len);
416 }
417 data->pseudonym_len = attr->next_pseudonym_len + realm_len;
418 if (data->use_pseudonym)
419 eap_set_anon_id(sm, data->pseudonym,
420 data->pseudonym_len);
421 }
422
423 if (attr->next_reauth_id) {
424 os_free(data->reauth_id);
425 data->reauth_id = os_memdup(attr->next_reauth_id,
426 attr->next_reauth_id_len);
427 if (data->reauth_id == NULL) {
428 wpa_printf(MSG_INFO, "EAP-AKA: (encr) No memory for "
429 "next reauth_id");
430 data->reauth_id_len = 0;
431 return -1;
432 }
433 data->reauth_id_len = attr->next_reauth_id_len;
434 wpa_hexdump_ascii(MSG_DEBUG,
435 "EAP-AKA: (encr) AT_NEXT_REAUTH_ID",
436 data->reauth_id,
437 data->reauth_id_len);
438 }
439
440 return 0;
441 }
442
443
eap_aka_add_id_msg(struct eap_aka_data * data,const struct wpabuf * msg1,const struct wpabuf * msg2)444 static int eap_aka_add_id_msg(struct eap_aka_data *data,
445 const struct wpabuf *msg1,
446 const struct wpabuf *msg2)
447 {
448 size_t len;
449
450 if (!msg1)
451 return -1;
452 len = wpabuf_len(msg1);
453 if (msg2)
454 len += wpabuf_len(msg2);
455
456 if (!data->id_msgs) {
457 data->id_msgs = wpabuf_alloc(len);
458 if (!data->id_msgs)
459 return -1;
460 } else if (wpabuf_resize(&data->id_msgs, len) < 0) {
461 return -1;
462 }
463
464 wpabuf_put_buf(data->id_msgs, msg1);
465 if (msg2)
466 wpabuf_put_buf(data->id_msgs, msg2);
467
468 return 0;
469 }
470
471
eap_aka_add_checkcode(struct eap_aka_data * data,struct eap_sim_msg * msg)472 static void eap_aka_add_checkcode(struct eap_aka_data *data,
473 struct eap_sim_msg *msg)
474 {
475 const u8 *addr;
476 size_t len;
477 u8 hash[SHA256_MAC_LEN];
478
479 wpa_printf(MSG_DEBUG, " AT_CHECKCODE");
480
481 if (data->id_msgs == NULL) {
482 /*
483 * No EAP-AKA/Identity packets were exchanged - send empty
484 * checkcode.
485 */
486 eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, NULL, 0);
487 return;
488 }
489
490 /* Checkcode is SHA1/SHA256 hash over all EAP-AKA/Identity packets. */
491 addr = wpabuf_head(data->id_msgs);
492 len = wpabuf_len(data->id_msgs);
493 wpa_hexdump(MSG_MSGDUMP, "EAP-AKA: AT_CHECKCODE data", addr, len);
494 #ifdef EAP_AKA_PRIME
495 if (data->eap_method == EAP_TYPE_AKA_PRIME)
496 sha256_vector(1, &addr, &len, hash);
497 else
498 #endif /* EAP_AKA_PRIME */
499 sha1_vector(1, &addr, &len, hash);
500
501 eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, hash,
502 data->eap_method == EAP_TYPE_AKA_PRIME ?
503 EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN);
504 }
505
506
eap_aka_verify_checkcode(struct eap_aka_data * data,const u8 * checkcode,size_t checkcode_len)507 static int eap_aka_verify_checkcode(struct eap_aka_data *data,
508 const u8 *checkcode, size_t checkcode_len)
509 {
510 const u8 *addr;
511 size_t len;
512 u8 hash[SHA256_MAC_LEN];
513 size_t hash_len;
514
515 if (checkcode == NULL)
516 return -1;
517
518 if (data->id_msgs == NULL) {
519 if (checkcode_len != 0) {
520 wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from server "
521 "indicates that AKA/Identity messages were "
522 "used, but they were not");
523 return -1;
524 }
525 return 0;
526 }
527
528 hash_len = data->eap_method == EAP_TYPE_AKA_PRIME ?
529 EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN;
530
531 if (checkcode_len != hash_len) {
532 wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from server "
533 "indicates that AKA/Identity message were not "
534 "used, but they were");
535 return -1;
536 }
537
538 /* Checkcode is SHA1/SHA256 hash over all EAP-AKA/Identity packets. */
539 addr = wpabuf_head(data->id_msgs);
540 len = wpabuf_len(data->id_msgs);
541 #ifdef EAP_AKA_PRIME
542 if (data->eap_method == EAP_TYPE_AKA_PRIME)
543 sha256_vector(1, &addr, &len, hash);
544 else
545 #endif /* EAP_AKA_PRIME */
546 sha1_vector(1, &addr, &len, hash);
547
548 if (os_memcmp_const(hash, checkcode, hash_len) != 0) {
549 wpa_printf(MSG_DEBUG, "EAP-AKA: Mismatch in AT_CHECKCODE");
550 return -1;
551 }
552
553 return 0;
554 }
555
556
eap_aka_client_error(struct eap_aka_data * data,u8 id,int err)557 static struct wpabuf * eap_aka_client_error(struct eap_aka_data *data, u8 id,
558 int err)
559 {
560 struct eap_sim_msg *msg;
561
562 eap_aka_state(data, FAILURE);
563 data->num_id_req = 0;
564 data->num_notification = 0;
565
566 wpa_printf(MSG_DEBUG, "EAP-AKA: Send Client-Error (error code %d)",
567 err);
568 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
569 EAP_AKA_SUBTYPE_CLIENT_ERROR);
570 eap_sim_msg_add(msg, EAP_SIM_AT_CLIENT_ERROR_CODE, err, NULL, 0);
571 return eap_sim_msg_finish(msg, data->eap_method, NULL, NULL, 0);
572 }
573
574
eap_aka_authentication_reject(struct eap_aka_data * data,u8 id)575 static struct wpabuf * eap_aka_authentication_reject(struct eap_aka_data *data,
576 u8 id)
577 {
578 struct eap_sim_msg *msg;
579
580 eap_aka_state(data, FAILURE);
581 data->num_id_req = 0;
582 data->num_notification = 0;
583
584 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Authentication-Reject "
585 "(id=%d)", id);
586 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
587 EAP_AKA_SUBTYPE_AUTHENTICATION_REJECT);
588 return eap_sim_msg_finish(msg, data->eap_method, NULL, NULL, 0);
589 }
590
591
eap_aka_synchronization_failure(struct eap_aka_data * data,u8 id,struct eap_sim_attrs * attr)592 static struct wpabuf * eap_aka_synchronization_failure(
593 struct eap_aka_data *data, u8 id, struct eap_sim_attrs *attr)
594 {
595 struct eap_sim_msg *msg;
596
597 data->num_id_req = 0;
598 data->num_notification = 0;
599
600 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Synchronization-Failure "
601 "(id=%d)", id);
602 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
603 EAP_AKA_SUBTYPE_SYNCHRONIZATION_FAILURE);
604 wpa_printf(MSG_DEBUG, " AT_AUTS");
605 eap_sim_msg_add_full(msg, EAP_SIM_AT_AUTS, data->auts,
606 EAP_AKA_AUTS_LEN);
607 if (data->eap_method == EAP_TYPE_AKA_PRIME) {
608 size_t i;
609
610 for (i = 0; i < attr->kdf_count; i++) {
611 wpa_printf(MSG_DEBUG, " AT_KDF");
612 eap_sim_msg_add(msg, EAP_SIM_AT_KDF, attr->kdf[i],
613 NULL, 0);
614 }
615 }
616 return eap_sim_msg_finish(msg, data->eap_method, NULL, NULL, 0);
617 }
618
619
eap_aka_response_identity(struct eap_sm * sm,struct eap_aka_data * data,u8 id,enum eap_sim_id_req id_req)620 static struct wpabuf * eap_aka_response_identity(struct eap_sm *sm,
621 struct eap_aka_data *data,
622 u8 id,
623 enum eap_sim_id_req id_req)
624 {
625 const u8 *identity = NULL;
626 size_t identity_len = 0;
627 struct eap_sim_msg *msg;
628
629 data->reauth = 0;
630 if (id_req == ANY_ID && data->reauth_id) {
631 identity = data->reauth_id;
632 identity_len = data->reauth_id_len;
633 data->reauth = 1;
634 } else if ((id_req == ANY_ID || id_req == FULLAUTH_ID) &&
635 data->pseudonym &&
636 !eap_sim_anonymous_username(data->pseudonym,
637 data->pseudonym_len)) {
638 identity = data->pseudonym;
639 identity_len = data->pseudonym_len;
640 eap_aka_clear_identities(sm, data, CLEAR_REAUTH_ID);
641 } else if (id_req != NO_ID_REQ) {
642 identity = eap_get_config_identity(sm, &identity_len);
643 if (identity) {
644 int ids = CLEAR_PSEUDONYM | CLEAR_REAUTH_ID;
645
646 if (data->pseudonym &&
647 eap_sim_anonymous_username(data->pseudonym,
648 data->pseudonym_len))
649 ids &= ~CLEAR_PSEUDONYM;
650 eap_aka_clear_identities(sm, data, ids);
651 }
652 }
653 if (id_req != NO_ID_REQ)
654 eap_aka_clear_identities(sm, data, CLEAR_EAP_ID);
655
656 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Identity (id=%d)", id);
657 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
658 EAP_AKA_SUBTYPE_IDENTITY);
659
660 if (identity) {
661 wpa_hexdump_ascii(MSG_DEBUG, " AT_IDENTITY",
662 identity, identity_len);
663 eap_sim_msg_add(msg, EAP_SIM_AT_IDENTITY, identity_len,
664 identity, identity_len);
665 }
666
667 return eap_sim_msg_finish(msg, data->eap_method, NULL, NULL, 0);
668 }
669
670
eap_aka_response_challenge(struct eap_aka_data * data,u8 id)671 static struct wpabuf * eap_aka_response_challenge(struct eap_aka_data *data,
672 u8 id)
673 {
674 struct eap_sim_msg *msg;
675
676 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Challenge (id=%d)", id);
677 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
678 EAP_AKA_SUBTYPE_CHALLENGE);
679 wpa_printf(MSG_DEBUG, " AT_RES");
680 eap_sim_msg_add(msg, EAP_SIM_AT_RES, data->res_len * 8,
681 data->res, data->res_len);
682 eap_aka_add_checkcode(data, msg);
683 if (data->use_result_ind) {
684 wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
685 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
686 }
687 wpa_printf(MSG_DEBUG, " AT_MAC");
688 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
689 return eap_sim_msg_finish(msg, data->eap_method, data->k_aut, (u8 *) "",
690 0);
691 }
692
693
eap_aka_response_reauth(struct eap_aka_data * data,u8 id,int counter_too_small,const u8 * nonce_s)694 static struct wpabuf * eap_aka_response_reauth(struct eap_aka_data *data,
695 u8 id, int counter_too_small,
696 const u8 *nonce_s)
697 {
698 struct eap_sim_msg *msg;
699 unsigned int counter;
700
701 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Reauthentication (id=%d)",
702 id);
703 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
704 EAP_AKA_SUBTYPE_REAUTHENTICATION);
705 wpa_printf(MSG_DEBUG, " AT_IV");
706 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
707 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA);
708
709 if (counter_too_small) {
710 wpa_printf(MSG_DEBUG, " *AT_COUNTER_TOO_SMALL");
711 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER_TOO_SMALL, 0, NULL, 0);
712 counter = data->counter_too_small;
713 } else
714 counter = data->counter;
715
716 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", counter);
717 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0);
718
719 if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) {
720 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to encrypt "
721 "AT_ENCR_DATA");
722 eap_sim_msg_free(msg);
723 return NULL;
724 }
725 eap_aka_add_checkcode(data, msg);
726 if (data->use_result_ind) {
727 wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
728 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
729 }
730 wpa_printf(MSG_DEBUG, " AT_MAC");
731 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
732 return eap_sim_msg_finish(msg, data->eap_method, data->k_aut, nonce_s,
733 EAP_SIM_NONCE_S_LEN);
734 }
735
736
eap_aka_response_notification(struct eap_aka_data * data,u8 id,u16 notification)737 static struct wpabuf * eap_aka_response_notification(struct eap_aka_data *data,
738 u8 id, u16 notification)
739 {
740 struct eap_sim_msg *msg;
741 u8 *k_aut = (notification & 0x4000) == 0 ? data->k_aut : NULL;
742
743 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Notification (id=%d)", id);
744 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
745 EAP_AKA_SUBTYPE_NOTIFICATION);
746 if (k_aut && data->reauth) {
747 wpa_printf(MSG_DEBUG, " AT_IV");
748 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
749 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV,
750 EAP_SIM_AT_ENCR_DATA);
751 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", data->counter);
752 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter,
753 NULL, 0);
754 if (eap_sim_msg_add_encr_end(msg, data->k_encr,
755 EAP_SIM_AT_PADDING)) {
756 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to encrypt "
757 "AT_ENCR_DATA");
758 eap_sim_msg_free(msg);
759 return NULL;
760 }
761 }
762 if (k_aut) {
763 wpa_printf(MSG_DEBUG, " AT_MAC");
764 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
765 }
766 return eap_sim_msg_finish(msg, data->eap_method, k_aut, (u8 *) "", 0);
767 }
768
769
eap_aka_process_identity(struct eap_sm * sm,struct eap_aka_data * data,u8 id,const struct wpabuf * reqData,struct eap_sim_attrs * attr)770 static struct wpabuf * eap_aka_process_identity(struct eap_sm *sm,
771 struct eap_aka_data *data,
772 u8 id,
773 const struct wpabuf *reqData,
774 struct eap_sim_attrs *attr)
775 {
776 int id_error;
777 struct wpabuf *buf;
778
779 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Identity");
780
781 id_error = 0;
782 switch (attr->id_req) {
783 case NO_ID_REQ:
784 break;
785 case ANY_ID:
786 if (data->num_id_req > 0)
787 id_error++;
788 data->num_id_req++;
789 break;
790 case FULLAUTH_ID:
791 if (data->num_id_req > 1)
792 id_error++;
793 data->num_id_req++;
794 break;
795 case PERMANENT_ID:
796 if (data->num_id_req > 2)
797 id_error++;
798 data->num_id_req++;
799 break;
800 }
801 if (id_error) {
802 wpa_printf(MSG_INFO, "EAP-AKA: Too many ID requests "
803 "used within one authentication");
804 return eap_aka_client_error(data, id,
805 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
806 }
807
808 buf = eap_aka_response_identity(sm, data, id, attr->id_req);
809
810 if (data->prev_id != id) {
811 if (eap_aka_add_id_msg(data, reqData, buf) < 0) {
812 wpa_printf(MSG_INFO,
813 "EAP-AKA: Failed to store ID messages");
814 wpabuf_free(buf);
815 return eap_aka_client_error(
816 data, id, EAP_AKA_UNABLE_TO_PROCESS_PACKET);
817 }
818 data->prev_id = id;
819 }
820
821 return buf;
822 }
823
824
eap_aka_verify_mac(struct eap_aka_data * data,const struct wpabuf * req,const u8 * mac,const u8 * extra,size_t extra_len)825 static int eap_aka_verify_mac(struct eap_aka_data *data,
826 const struct wpabuf *req,
827 const u8 *mac, const u8 *extra,
828 size_t extra_len)
829 {
830 if (data->eap_method == EAP_TYPE_AKA_PRIME)
831 return eap_sim_verify_mac_sha256(data->k_aut, req, mac, extra,
832 extra_len);
833 return eap_sim_verify_mac(data->k_aut, req, mac, extra, extra_len);
834 }
835
836
837 #ifdef EAP_AKA_PRIME
eap_aka_prime_kdf_select(struct eap_aka_data * data,u8 id,u16 kdf)838 static struct wpabuf * eap_aka_prime_kdf_select(struct eap_aka_data *data,
839 u8 id, u16 kdf)
840 {
841 struct eap_sim_msg *msg;
842
843 data->kdf_negotiation = 1;
844 data->kdf = kdf;
845 wpa_printf(MSG_DEBUG, "Generating EAP-AKA Challenge (id=%d) (KDF "
846 "select)", id);
847 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
848 EAP_AKA_SUBTYPE_CHALLENGE);
849 wpa_printf(MSG_DEBUG, " AT_KDF");
850 eap_sim_msg_add(msg, EAP_SIM_AT_KDF, kdf, NULL, 0);
851 return eap_sim_msg_finish(msg, data->eap_method, NULL, NULL, 0);
852 }
853
854
eap_aka_prime_kdf_neg(struct eap_aka_data * data,u8 id,struct eap_sim_attrs * attr)855 static struct wpabuf * eap_aka_prime_kdf_neg(struct eap_aka_data *data,
856 u8 id, struct eap_sim_attrs *attr)
857 {
858 size_t i;
859
860 for (i = 0; i < attr->kdf_count; i++) {
861 if (attr->kdf[i] == EAP_AKA_PRIME_KDF) {
862 os_memcpy(data->last_kdf_attrs, attr->kdf,
863 sizeof(u16) * attr->kdf_count);
864 data->last_kdf_count = attr->kdf_count;
865 return eap_aka_prime_kdf_select(data, id,
866 EAP_AKA_PRIME_KDF);
867 }
868 }
869
870 /* No matching KDF found - fail authentication as if AUTN had been
871 * incorrect */
872 return eap_aka_authentication_reject(data, id);
873 }
874
875
eap_aka_prime_kdf_valid(struct eap_aka_data * data,struct eap_sim_attrs * attr)876 static int eap_aka_prime_kdf_valid(struct eap_aka_data *data,
877 struct eap_sim_attrs *attr)
878 {
879 size_t i, j;
880
881 if (attr->kdf_count == 0)
882 return 0;
883
884 /* The only allowed (and required) duplication of a KDF is the addition
885 * of the selected KDF into the beginning of the list. */
886
887 if (data->kdf_negotiation) {
888 /* When the peer receives the new EAP-Request/AKA'-Challenge
889 * message, must check only requested change occurred in the
890 * list of AT_KDF attributes. If there are any other changes,
891 * the peer must behave like the case that AT_MAC had been
892 * incorrect and authentication is failed. These are defined in
893 * EAP-AKA' specification RFC 5448, Section 3.2. */
894 if (attr->kdf[0] != data->kdf) {
895 wpa_printf(MSG_WARNING, "EAP-AKA': The server did not "
896 "accept the selected KDF");
897 return -1;
898 }
899
900 if (attr->kdf_count > EAP_AKA_PRIME_KDF_MAX ||
901 attr->kdf_count != data->last_kdf_count + 1) {
902 wpa_printf(MSG_WARNING,
903 "EAP-AKA': The length of KDF attributes is wrong");
904 return -1;
905 }
906
907 for (i = 1; i < attr->kdf_count; i++) {
908 if (attr->kdf[i] != data->last_kdf_attrs[i - 1]) {
909 wpa_printf(MSG_WARNING,
910 "EAP-AKA': The KDF attributes except selected KDF are not same as original one");
911 return -1;
912 }
913 }
914 }
915
916 for (i = data->kdf ? 1 : 0; i < attr->kdf_count; i++) {
917 for (j = i + 1; j < attr->kdf_count; j++) {
918 if (attr->kdf[i] == attr->kdf[j]) {
919 wpa_printf(MSG_WARNING, "EAP-AKA': The server "
920 "included a duplicated KDF");
921 return 0;
922 }
923 }
924 }
925
926 return 1;
927 }
928 #endif /* EAP_AKA_PRIME */
929
930
eap_aka_process_challenge(struct eap_sm * sm,struct eap_aka_data * data,u8 id,const struct wpabuf * reqData,struct eap_sim_attrs * attr)931 static struct wpabuf * eap_aka_process_challenge(struct eap_sm *sm,
932 struct eap_aka_data *data,
933 u8 id,
934 const struct wpabuf *reqData,
935 struct eap_sim_attrs *attr)
936 {
937 const u8 *identity;
938 size_t identity_len;
939 int res;
940 struct eap_sim_attrs eattr;
941
942 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Challenge");
943
944 if (attr->checkcode &&
945 eap_aka_verify_checkcode(data, attr->checkcode,
946 attr->checkcode_len)) {
947 wpa_printf(MSG_WARNING, "EAP-AKA: Invalid AT_CHECKCODE in the "
948 "message");
949 #ifdef TEST_FUZZ
950 wpa_printf(MSG_INFO,
951 "TEST: Ignore AT_CHECKCODE mismatch for fuzz testing");
952 #else /* TEST_FUZZ */
953 return eap_aka_client_error(data, id,
954 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
955 #endif /* TEST_FUZZ */
956 }
957
958 #ifdef EAP_AKA_PRIME
959 if (data->eap_method == EAP_TYPE_AKA_PRIME) {
960 if (!attr->kdf_input || attr->kdf_input_len == 0) {
961 wpa_printf(MSG_WARNING, "EAP-AKA': Challenge message "
962 "did not include non-empty AT_KDF_INPUT");
963 /* Fail authentication as if AUTN had been incorrect */
964 return eap_aka_authentication_reject(data, id);
965 }
966 os_free(data->network_name);
967 data->network_name = os_memdup(attr->kdf_input,
968 attr->kdf_input_len);
969 if (data->network_name == NULL) {
970 wpa_printf(MSG_WARNING, "EAP-AKA': No memory for "
971 "storing Network Name");
972 return eap_aka_authentication_reject(data, id);
973 }
974 data->network_name_len = attr->kdf_input_len;
975 wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA': Network Name "
976 "(AT_KDF_INPUT)",
977 data->network_name, data->network_name_len);
978 /* TODO: check Network Name per 3GPP.33.402 */
979
980 res = eap_aka_prime_kdf_valid(data, attr);
981 if (res == 0)
982 return eap_aka_authentication_reject(data, id);
983 else if (res == -1)
984 return eap_aka_client_error(
985 data, id, EAP_AKA_UNABLE_TO_PROCESS_PACKET);
986
987 if (attr->kdf[0] != EAP_AKA_PRIME_KDF)
988 return eap_aka_prime_kdf_neg(data, id, attr);
989
990 data->kdf = EAP_AKA_PRIME_KDF;
991 wpa_printf(MSG_DEBUG, "EAP-AKA': KDF %d selected", data->kdf);
992 }
993
994 if (data->eap_method == EAP_TYPE_AKA && attr->bidding) {
995 u16 flags = WPA_GET_BE16(attr->bidding);
996 if ((flags & EAP_AKA_BIDDING_FLAG_D) &&
997 eap_allowed_method(sm, EAP_VENDOR_IETF,
998 EAP_TYPE_AKA_PRIME)) {
999 wpa_printf(MSG_WARNING, "EAP-AKA: Bidding down from "
1000 "AKA' to AKA detected");
1001 /* Fail authentication as if AUTN had been incorrect */
1002 return eap_aka_authentication_reject(data, id);
1003 }
1004 }
1005 #endif /* EAP_AKA_PRIME */
1006
1007 data->reauth = 0;
1008 if (!attr->mac || !attr->rand || !attr->autn) {
1009 wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message "
1010 "did not include%s%s%s",
1011 !attr->mac ? " AT_MAC" : "",
1012 !attr->rand ? " AT_RAND" : "",
1013 !attr->autn ? " AT_AUTN" : "");
1014 return eap_aka_client_error(data, id,
1015 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1016 }
1017 os_memcpy(data->rand, attr->rand, EAP_AKA_RAND_LEN);
1018 os_memcpy(data->autn, attr->autn, EAP_AKA_AUTN_LEN);
1019
1020 res = eap_aka_umts_auth(sm, data);
1021 if (res == -1) {
1022 wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication "
1023 "failed (AUTN)");
1024 return eap_aka_authentication_reject(data, id);
1025 } else if (res == -2) {
1026 wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication "
1027 "failed (AUTN seq# -> AUTS)");
1028 return eap_aka_synchronization_failure(data, id, attr);
1029 } else if (res > 0) {
1030 wpa_printf(MSG_DEBUG, "EAP-AKA: Wait for external USIM processing");
1031 return NULL;
1032 } else if (res) {
1033 wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication failed");
1034 return eap_aka_client_error(data, id,
1035 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1036 }
1037 #ifdef EAP_AKA_PRIME
1038 if (data->eap_method == EAP_TYPE_AKA_PRIME) {
1039 /* Note: AUTN = (SQN ^ AK) || AMF || MAC which gives us the
1040 * needed 6-octet SQN ^ AK for CK',IK' derivation */
1041 u16 amf = WPA_GET_BE16(data->autn + 6);
1042 if (!(amf & 0x8000)) {
1043 wpa_printf(MSG_WARNING, "EAP-AKA': AMF separation bit "
1044 "not set (AMF=0x%4x)", amf);
1045 return eap_aka_authentication_reject(data, id);
1046 }
1047 eap_aka_prime_derive_ck_ik_prime(data->ck, data->ik,
1048 data->autn,
1049 data->network_name,
1050 data->network_name_len);
1051 }
1052 #endif /* EAP_AKA_PRIME */
1053 if (data->last_eap_identity) {
1054 identity = data->last_eap_identity;
1055 identity_len = data->last_eap_identity_len;
1056 } else if (data->pseudonym &&
1057 !eap_sim_anonymous_username(data->pseudonym,
1058 data->pseudonym_len)) {
1059 identity = data->pseudonym;
1060 identity_len = data->pseudonym_len;
1061 } else {
1062 struct eap_peer_config *config;
1063
1064 config = eap_get_config(sm);
1065 if (config && config->imsi_identity) {
1066 identity = config->imsi_identity;
1067 identity_len = config->imsi_identity_len;
1068 } else {
1069 identity = eap_get_config_identity(sm, &identity_len);
1070 }
1071 }
1072 wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA: Selected identity for MK "
1073 "derivation", identity, identity_len);
1074 if (data->eap_method == EAP_TYPE_AKA_PRIME) {
1075 eap_aka_prime_derive_keys(identity, identity_len, data->ik,
1076 data->ck, data->k_encr, data->k_aut,
1077 data->k_re, data->msk, data->emsk);
1078 } else {
1079 eap_aka_derive_mk(identity, identity_len, data->ik, data->ck,
1080 data->mk);
1081 eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut,
1082 data->msk, data->emsk);
1083 }
1084 if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
1085 wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message "
1086 "used invalid AT_MAC");
1087 #ifdef TEST_FUZZ
1088 wpa_printf(MSG_INFO,
1089 "TEST: Ignore AT_MAC mismatch for fuzz testing");
1090 #else /* TEST_FUZZ */
1091 return eap_aka_client_error(data, id,
1092 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1093 #endif /* TEST_FUZZ */
1094 }
1095
1096 /* Old reauthentication identity must not be used anymore. In
1097 * other words, if no new identities are received, full
1098 * authentication will be used on next reauthentication (using
1099 * pseudonym identity or permanent identity). */
1100 eap_aka_clear_identities(sm, data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
1101
1102 if (attr->encr_data) {
1103 u8 *decrypted;
1104 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
1105 attr->encr_data_len, attr->iv,
1106 &eattr, 0);
1107 if (decrypted == NULL) {
1108 return eap_aka_client_error(
1109 data, id, EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1110 }
1111 eap_aka_learn_ids(sm, data, &eattr);
1112 os_free(decrypted);
1113 }
1114
1115 if (data->result_ind && attr->result_ind)
1116 data->use_result_ind = 1;
1117
1118 if (data->state != FAILURE) {
1119 eap_aka_state(data, data->use_result_ind ?
1120 RESULT_SUCCESS : SUCCESS);
1121 }
1122
1123 data->num_id_req = 0;
1124 data->num_notification = 0;
1125 /* RFC 4187 specifies that counter is initialized to one after
1126 * fullauth, but initializing it to zero makes it easier to implement
1127 * reauth verification. */
1128 data->counter = 0;
1129 return eap_aka_response_challenge(data, id);
1130 }
1131
1132
eap_aka_process_notification_reauth(struct eap_aka_data * data,struct eap_sim_attrs * attr)1133 static int eap_aka_process_notification_reauth(struct eap_aka_data *data,
1134 struct eap_sim_attrs *attr)
1135 {
1136 struct eap_sim_attrs eattr;
1137 u8 *decrypted;
1138
1139 if (attr->encr_data == NULL || attr->iv == NULL) {
1140 wpa_printf(MSG_WARNING, "EAP-AKA: Notification message after "
1141 "reauth did not include encrypted data");
1142 return -1;
1143 }
1144
1145 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
1146 attr->encr_data_len, attr->iv, &eattr,
1147 0);
1148 if (decrypted == NULL) {
1149 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to parse encrypted "
1150 "data from notification message");
1151 return -1;
1152 }
1153
1154 if (eattr.counter < 0 || (size_t) eattr.counter != data->counter) {
1155 wpa_printf(MSG_WARNING, "EAP-AKA: Counter in notification "
1156 "message does not match with counter in reauth "
1157 "message");
1158 os_free(decrypted);
1159 return -1;
1160 }
1161
1162 os_free(decrypted);
1163 return 0;
1164 }
1165
1166
eap_aka_process_notification_auth(struct eap_aka_data * data,const struct wpabuf * reqData,struct eap_sim_attrs * attr)1167 static int eap_aka_process_notification_auth(struct eap_aka_data *data,
1168 const struct wpabuf *reqData,
1169 struct eap_sim_attrs *attr)
1170 {
1171 if (attr->mac == NULL) {
1172 wpa_printf(MSG_INFO, "EAP-AKA: no AT_MAC in after_auth "
1173 "Notification message");
1174 return -1;
1175 }
1176
1177 if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
1178 wpa_printf(MSG_WARNING, "EAP-AKA: Notification message "
1179 "used invalid AT_MAC");
1180 return -1;
1181 }
1182
1183 if (data->reauth &&
1184 eap_aka_process_notification_reauth(data, attr)) {
1185 wpa_printf(MSG_WARNING, "EAP-AKA: Invalid notification "
1186 "message after reauth");
1187 return -1;
1188 }
1189
1190 return 0;
1191 }
1192
1193
eap_aka_process_notification(struct eap_sm * sm,struct eap_aka_data * data,u8 id,const struct wpabuf * reqData,struct eap_sim_attrs * attr)1194 static struct wpabuf * eap_aka_process_notification(
1195 struct eap_sm *sm, struct eap_aka_data *data, u8 id,
1196 const struct wpabuf *reqData, struct eap_sim_attrs *attr)
1197 {
1198 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Notification");
1199 if (data->num_notification > 0) {
1200 wpa_printf(MSG_INFO, "EAP-AKA: too many notification "
1201 "rounds (only one allowed)");
1202 return eap_aka_client_error(data, id,
1203 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1204 }
1205 data->num_notification++;
1206 if (attr->notification == -1) {
1207 wpa_printf(MSG_INFO, "EAP-AKA: no AT_NOTIFICATION in "
1208 "Notification message");
1209 return eap_aka_client_error(data, id,
1210 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1211 }
1212
1213 if ((attr->notification & 0x4000) == 0 &&
1214 eap_aka_process_notification_auth(data, reqData, attr)) {
1215 return eap_aka_client_error(data, id,
1216 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1217 }
1218
1219 eap_sim_report_notification(sm->msg_ctx, attr->notification, 1);
1220 if (attr->notification >= 0 && attr->notification < 32768) {
1221 data->error_code = attr->notification;
1222 eap_aka_state(data, FAILURE);
1223 } else if (attr->notification == EAP_SIM_SUCCESS &&
1224 data->state == RESULT_SUCCESS)
1225 eap_aka_state(data, SUCCESS);
1226 return eap_aka_response_notification(data, id, attr->notification);
1227 }
1228
1229
eap_aka_process_reauthentication(struct eap_sm * sm,struct eap_aka_data * data,u8 id,const struct wpabuf * reqData,struct eap_sim_attrs * attr)1230 static struct wpabuf * eap_aka_process_reauthentication(
1231 struct eap_sm *sm, struct eap_aka_data *data, u8 id,
1232 const struct wpabuf *reqData, struct eap_sim_attrs *attr)
1233 {
1234 struct eap_sim_attrs eattr;
1235 u8 *decrypted;
1236
1237 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Reauthentication");
1238
1239 if (attr->checkcode &&
1240 eap_aka_verify_checkcode(data, attr->checkcode,
1241 attr->checkcode_len)) {
1242 #ifdef TEST_FUZZ
1243 wpa_printf(MSG_INFO,
1244 "TEST: Ignore AT_CHECKCODE mismatch for fuzz testing");
1245 #else /* TEST_FUZZ */
1246 wpa_printf(MSG_WARNING, "EAP-AKA: Invalid AT_CHECKCODE in the "
1247 "message");
1248 #endif /* TEST_FUZZ */
1249 return eap_aka_client_error(data, id,
1250 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1251 }
1252
1253 if (data->reauth_id == NULL) {
1254 wpa_printf(MSG_WARNING, "EAP-AKA: Server is trying "
1255 "reauthentication, but no reauth_id available");
1256 return eap_aka_client_error(data, id,
1257 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1258 }
1259
1260 data->reauth = 1;
1261 if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
1262 wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication "
1263 "did not have valid AT_MAC");
1264 return eap_aka_client_error(data, id,
1265 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1266 }
1267
1268 /* At this stage the received MAC has been verified. Use this MAC for
1269 * reauth Session-Id calculation if all other checks pass.
1270 * The peer does not use the local MAC but the received MAC in deriving
1271 * Session-Id. */
1272 os_memcpy(data->reauth_mac, attr->mac, EAP_SIM_MAC_LEN);
1273 wpa_hexdump(MSG_DEBUG, "EAP-AKA: Server MAC",
1274 data->reauth_mac, EAP_SIM_MAC_LEN);
1275
1276 if (attr->encr_data == NULL || attr->iv == NULL) {
1277 wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication "
1278 "message did not include encrypted data");
1279 return eap_aka_client_error(data, id,
1280 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1281 }
1282
1283 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
1284 attr->encr_data_len, attr->iv, &eattr,
1285 0);
1286 if (decrypted == NULL) {
1287 wpa_printf(MSG_WARNING, "EAP-AKA: Failed to parse encrypted "
1288 "data from reauthentication message");
1289 return eap_aka_client_error(data, id,
1290 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1291 }
1292
1293 if (eattr.nonce_s == NULL || eattr.counter < 0) {
1294 wpa_printf(MSG_INFO, "EAP-AKA: (encr) No%s%s in reauth packet",
1295 !eattr.nonce_s ? " AT_NONCE_S" : "",
1296 eattr.counter < 0 ? " AT_COUNTER" : "");
1297 os_free(decrypted);
1298 return eap_aka_client_error(data, id,
1299 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1300 }
1301
1302 if (eattr.counter < 0 || (size_t) eattr.counter <= data->counter) {
1303 struct wpabuf *res;
1304 wpa_printf(MSG_INFO, "EAP-AKA: (encr) Invalid counter "
1305 "(%d <= %d)", eattr.counter, data->counter);
1306 data->counter_too_small = eattr.counter;
1307
1308 /* Reply using Re-auth w/ AT_COUNTER_TOO_SMALL. The current
1309 * reauth_id must not be used to start a new reauthentication.
1310 * However, since it was used in the last EAP-Response-Identity
1311 * packet, it has to saved for the following fullauth to be
1312 * used in MK derivation. */
1313 os_free(data->last_eap_identity);
1314 data->last_eap_identity = data->reauth_id;
1315 data->last_eap_identity_len = data->reauth_id_len;
1316 data->reauth_id = NULL;
1317 data->reauth_id_len = 0;
1318
1319 res = eap_aka_response_reauth(data, id, 1, eattr.nonce_s);
1320 os_free(decrypted);
1321
1322 return res;
1323 }
1324 data->counter = eattr.counter;
1325
1326 os_memcpy(data->nonce_s, eattr.nonce_s, EAP_SIM_NONCE_S_LEN);
1327 wpa_hexdump(MSG_DEBUG, "EAP-AKA: (encr) AT_NONCE_S",
1328 data->nonce_s, EAP_SIM_NONCE_S_LEN);
1329
1330 if (data->eap_method == EAP_TYPE_AKA_PRIME) {
1331 eap_aka_prime_derive_keys_reauth(data->k_re, data->counter,
1332 data->reauth_id,
1333 data->reauth_id_len,
1334 data->nonce_s,
1335 data->msk, data->emsk);
1336 } else {
1337 eap_sim_derive_keys_reauth(data->counter, data->reauth_id,
1338 data->reauth_id_len,
1339 data->nonce_s, data->mk,
1340 data->msk, data->emsk);
1341 }
1342 eap_aka_clear_identities(sm, data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
1343 eap_aka_learn_ids(sm, data, &eattr);
1344
1345 if (data->result_ind && attr->result_ind)
1346 data->use_result_ind = 1;
1347
1348 if (data->state != FAILURE) {
1349 eap_aka_state(data, data->use_result_ind ?
1350 RESULT_SUCCESS : SUCCESS);
1351 }
1352
1353 data->num_id_req = 0;
1354 data->num_notification = 0;
1355 if (data->counter > EAP_AKA_MAX_FAST_REAUTHS) {
1356 wpa_printf(MSG_DEBUG, "EAP-AKA: Maximum number of "
1357 "fast reauths performed - force fullauth");
1358 eap_aka_clear_identities(sm, data,
1359 CLEAR_REAUTH_ID | CLEAR_EAP_ID);
1360 }
1361 os_free(decrypted);
1362 return eap_aka_response_reauth(data, id, 0, data->nonce_s);
1363 }
1364
1365
eap_aka_process(struct eap_sm * sm,void * priv,struct eap_method_ret * ret,const struct wpabuf * reqData)1366 static struct wpabuf * eap_aka_process(struct eap_sm *sm, void *priv,
1367 struct eap_method_ret *ret,
1368 const struct wpabuf *reqData)
1369 {
1370 struct eap_aka_data *data = priv;
1371 const struct eap_hdr *req;
1372 u8 subtype, id;
1373 struct wpabuf *res;
1374 const u8 *pos;
1375 struct eap_sim_attrs attr;
1376 size_t len;
1377
1378 wpa_hexdump_buf(MSG_DEBUG, "EAP-AKA: EAP data", reqData);
1379 if (eap_get_config_identity(sm, &len) == NULL) {
1380 wpa_printf(MSG_INFO, "EAP-AKA: Identity not configured");
1381 eap_sm_request_identity(sm);
1382 ret->ignore = true;
1383 return NULL;
1384 }
1385
1386 pos = eap_hdr_validate(EAP_VENDOR_IETF, data->eap_method, reqData,
1387 &len);
1388 if (pos == NULL || len < 3) {
1389 ret->ignore = true;
1390 return NULL;
1391 }
1392 req = wpabuf_head(reqData);
1393 id = req->identifier;
1394 len = be_to_host16(req->length);
1395
1396 ret->ignore = false;
1397 ret->methodState = METHOD_MAY_CONT;
1398 ret->decision = DECISION_FAIL;
1399 ret->allowNotifications = true;
1400
1401 subtype = *pos++;
1402 wpa_printf(MSG_DEBUG, "EAP-AKA: Subtype=%d", subtype);
1403 pos += 2; /* Reserved */
1404
1405 if (eap_sim_parse_attr(pos, wpabuf_head_u8(reqData) + len, &attr,
1406 data->eap_method == EAP_TYPE_AKA_PRIME ? 2 : 1,
1407 0)) {
1408 res = eap_aka_client_error(data, id,
1409 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1410 goto done;
1411 }
1412
1413 switch (subtype) {
1414 case EAP_AKA_SUBTYPE_IDENTITY:
1415 res = eap_aka_process_identity(sm, data, id, reqData, &attr);
1416 break;
1417 case EAP_AKA_SUBTYPE_CHALLENGE:
1418 res = eap_aka_process_challenge(sm, data, id, reqData, &attr);
1419 break;
1420 case EAP_AKA_SUBTYPE_NOTIFICATION:
1421 res = eap_aka_process_notification(sm, data, id, reqData,
1422 &attr);
1423 break;
1424 case EAP_AKA_SUBTYPE_REAUTHENTICATION:
1425 res = eap_aka_process_reauthentication(sm, data, id, reqData,
1426 &attr);
1427 break;
1428 case EAP_AKA_SUBTYPE_CLIENT_ERROR:
1429 wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Client-Error");
1430 res = eap_aka_client_error(data, id,
1431 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1432 break;
1433 default:
1434 wpa_printf(MSG_DEBUG, "EAP-AKA: Unknown subtype=%d", subtype);
1435 res = eap_aka_client_error(data, id,
1436 EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1437 break;
1438 }
1439
1440 done:
1441 if (data->state == FAILURE) {
1442 ret->decision = DECISION_FAIL;
1443 ret->methodState = METHOD_DONE;
1444 } else if (data->state == SUCCESS) {
1445 ret->decision = data->use_result_ind ?
1446 DECISION_UNCOND_SUCC : DECISION_COND_SUCC;
1447 /*
1448 * It is possible for the server to reply with AKA
1449 * Notification, so we must allow the method to continue and
1450 * not only accept EAP-Success at this point.
1451 */
1452 ret->methodState = data->use_result_ind ?
1453 METHOD_DONE : METHOD_MAY_CONT;
1454 } else if (data->state == RESULT_SUCCESS)
1455 ret->methodState = METHOD_CONT;
1456
1457 if (ret->methodState == METHOD_DONE) {
1458 ret->allowNotifications = false;
1459 }
1460
1461 return res;
1462 }
1463
1464
eap_aka_has_reauth_data(struct eap_sm * sm,void * priv)1465 static bool eap_aka_has_reauth_data(struct eap_sm *sm, void *priv)
1466 {
1467 struct eap_aka_data *data = priv;
1468 return data->pseudonym || data->reauth_id;
1469 }
1470
1471
eap_aka_deinit_for_reauth(struct eap_sm * sm,void * priv)1472 static void eap_aka_deinit_for_reauth(struct eap_sm *sm, void *priv)
1473 {
1474 struct eap_aka_data *data = priv;
1475 eap_aka_clear_identities(sm, data, CLEAR_EAP_ID);
1476 data->prev_id = -1;
1477 wpabuf_free(data->id_msgs);
1478 data->id_msgs = NULL;
1479 data->use_result_ind = 0;
1480 data->kdf_negotiation = 0;
1481 eap_aka_clear_keys(data, 1);
1482 }
1483
1484
eap_aka_init_for_reauth(struct eap_sm * sm,void * priv)1485 static void * eap_aka_init_for_reauth(struct eap_sm *sm, void *priv)
1486 {
1487 struct eap_aka_data *data = priv;
1488 data->num_id_req = 0;
1489 data->num_notification = 0;
1490 eap_aka_state(data, CONTINUE);
1491 return priv;
1492 }
1493
1494
eap_aka_get_identity(struct eap_sm * sm,void * priv,size_t * len)1495 static const u8 * eap_aka_get_identity(struct eap_sm *sm, void *priv,
1496 size_t *len)
1497 {
1498 struct eap_aka_data *data = priv;
1499
1500 if (data->reauth_id) {
1501 *len = data->reauth_id_len;
1502 return data->reauth_id;
1503 }
1504
1505 if (data->pseudonym) {
1506 *len = data->pseudonym_len;
1507 return data->pseudonym;
1508 }
1509
1510 return NULL;
1511 }
1512
1513
eap_aka_isKeyAvailable(struct eap_sm * sm,void * priv)1514 static bool eap_aka_isKeyAvailable(struct eap_sm *sm, void *priv)
1515 {
1516 struct eap_aka_data *data = priv;
1517 return data->state == SUCCESS;
1518 }
1519
1520
eap_aka_getKey(struct eap_sm * sm,void * priv,size_t * len)1521 static u8 * eap_aka_getKey(struct eap_sm *sm, void *priv, size_t *len)
1522 {
1523 struct eap_aka_data *data = priv;
1524 u8 *key;
1525
1526 if (data->state != SUCCESS)
1527 return NULL;
1528
1529 key = os_memdup(data->msk, EAP_SIM_KEYING_DATA_LEN);
1530 if (key == NULL)
1531 return NULL;
1532
1533 *len = EAP_SIM_KEYING_DATA_LEN;
1534
1535 return key;
1536 }
1537
1538
eap_aka_get_session_id(struct eap_sm * sm,void * priv,size_t * len)1539 static u8 * eap_aka_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1540 {
1541 struct eap_aka_data *data = priv;
1542 u8 *id;
1543
1544 if (data->state != SUCCESS)
1545 return NULL;
1546
1547 if (!data->reauth)
1548 *len = 1 + EAP_AKA_RAND_LEN + EAP_AKA_AUTN_LEN;
1549 else
1550 *len = 1 + EAP_SIM_NONCE_S_LEN + EAP_SIM_MAC_LEN;
1551 id = os_malloc(*len);
1552 if (id == NULL)
1553 return NULL;
1554
1555 id[0] = data->eap_method;
1556 if (!data->reauth) {
1557 os_memcpy(id + 1, data->rand, EAP_AKA_RAND_LEN);
1558 os_memcpy(id + 1 + EAP_AKA_RAND_LEN, data->autn,
1559 EAP_AKA_AUTN_LEN);
1560 } else {
1561 os_memcpy(id + 1, data->nonce_s, EAP_SIM_NONCE_S_LEN);
1562 os_memcpy(id + 1 + EAP_SIM_NONCE_S_LEN, data->reauth_mac,
1563 EAP_SIM_MAC_LEN);
1564 }
1565 wpa_hexdump(MSG_DEBUG, "EAP-AKA: Derived Session-Id", id, *len);
1566
1567 return id;
1568 }
1569
1570
eap_aka_get_emsk(struct eap_sm * sm,void * priv,size_t * len)1571 static u8 * eap_aka_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1572 {
1573 struct eap_aka_data *data = priv;
1574 u8 *key;
1575
1576 if (data->state != SUCCESS)
1577 return NULL;
1578
1579 key = os_memdup(data->emsk, EAP_EMSK_LEN);
1580 if (key == NULL)
1581 return NULL;
1582
1583 *len = EAP_EMSK_LEN;
1584
1585 return key;
1586 }
1587
1588
eap_aka_get_error_code(void * priv)1589 static int eap_aka_get_error_code(void *priv)
1590 {
1591 struct eap_aka_data *data = priv;
1592 int current_data_error;
1593
1594 if (!data)
1595 return NO_EAP_METHOD_ERROR;
1596
1597 current_data_error = data->error_code;
1598
1599 /* Now reset for next transaction */
1600 data->error_code = NO_EAP_METHOD_ERROR;
1601
1602 return current_data_error;
1603 }
1604
1605
eap_peer_aka_register(void)1606 int eap_peer_aka_register(void)
1607 {
1608 struct eap_method *eap;
1609
1610 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1611 EAP_VENDOR_IETF, EAP_TYPE_AKA, "AKA");
1612 if (eap == NULL)
1613 return -1;
1614
1615 eap->init = eap_aka_init;
1616 eap->deinit = eap_aka_deinit;
1617 eap->process = eap_aka_process;
1618 eap->isKeyAvailable = eap_aka_isKeyAvailable;
1619 eap->getKey = eap_aka_getKey;
1620 eap->getSessionId = eap_aka_get_session_id;
1621 eap->has_reauth_data = eap_aka_has_reauth_data;
1622 eap->deinit_for_reauth = eap_aka_deinit_for_reauth;
1623 eap->init_for_reauth = eap_aka_init_for_reauth;
1624 eap->get_identity = eap_aka_get_identity;
1625 eap->get_emsk = eap_aka_get_emsk;
1626 eap->get_error_code = eap_aka_get_error_code;
1627
1628 return eap_peer_method_register(eap);
1629 }
1630
1631
1632 #ifdef EAP_AKA_PRIME
eap_peer_aka_prime_register(void)1633 int eap_peer_aka_prime_register(void)
1634 {
1635 struct eap_method *eap;
1636
1637 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1638 EAP_VENDOR_IETF, EAP_TYPE_AKA_PRIME,
1639 "AKA'");
1640 if (eap == NULL)
1641 return -1;
1642
1643 eap->init = eap_aka_prime_init;
1644 eap->deinit = eap_aka_deinit;
1645 eap->process = eap_aka_process;
1646 eap->isKeyAvailable = eap_aka_isKeyAvailable;
1647 eap->getKey = eap_aka_getKey;
1648 eap->getSessionId = eap_aka_get_session_id;
1649 eap->has_reauth_data = eap_aka_has_reauth_data;
1650 eap->deinit_for_reauth = eap_aka_deinit_for_reauth;
1651 eap->init_for_reauth = eap_aka_init_for_reauth;
1652 eap->get_identity = eap_aka_get_identity;
1653 eap->get_emsk = eap_aka_get_emsk;
1654 eap->get_error_code = eap_aka_get_error_code;
1655
1656 return eap_peer_method_register(eap);
1657 }
1658 #endif /* EAP_AKA_PRIME */
1659