Line data Source code
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, SUCCESS, FAILURE
46 : } state;
47 :
48 : struct wpabuf *id_msgs;
49 : int prev_id;
50 : int result_ind, use_result_ind;
51 : u8 eap_method;
52 : u8 *network_name;
53 : size_t network_name_len;
54 : u16 kdf;
55 : int kdf_negotiation;
56 : };
57 :
58 :
59 : #ifndef CONFIG_NO_STDOUT_DEBUG
60 490 : static const char * eap_aka_state_txt(int state)
61 : {
62 490 : switch (state) {
63 : case CONTINUE:
64 345 : return "CONTINUE";
65 : case RESULT_SUCCESS:
66 8 : return "RESULT_SUCCESS";
67 : case SUCCESS:
68 55 : return "SUCCESS";
69 : case FAILURE:
70 82 : return "FAILURE";
71 : default:
72 0 : return "?";
73 : }
74 : }
75 : #endif /* CONFIG_NO_STDOUT_DEBUG */
76 :
77 :
78 245 : static void eap_aka_state(struct eap_aka_data *data, int state)
79 : {
80 490 : wpa_printf(MSG_DEBUG, "EAP-AKA: %s -> %s",
81 245 : eap_aka_state_txt(data->state),
82 : eap_aka_state_txt(state));
83 245 : data->state = state;
84 245 : }
85 :
86 :
87 104 : static void * eap_aka_init(struct eap_sm *sm)
88 : {
89 : struct eap_aka_data *data;
90 104 : const char *phase1 = eap_get_config_phase1(sm);
91 104 : struct eap_peer_config *config = eap_get_config(sm);
92 :
93 104 : data = os_zalloc(sizeof(*data));
94 104 : if (data == NULL)
95 0 : return NULL;
96 :
97 104 : data->eap_method = EAP_TYPE_AKA;
98 :
99 104 : eap_aka_state(data, CONTINUE);
100 104 : data->prev_id = -1;
101 :
102 104 : data->result_ind = phase1 && os_strstr(phase1, "result_ind=1") != NULL;
103 :
104 104 : if (config && config->anonymous_identity) {
105 4 : data->pseudonym = os_malloc(config->anonymous_identity_len);
106 4 : if (data->pseudonym) {
107 4 : os_memcpy(data->pseudonym, config->anonymous_identity,
108 : config->anonymous_identity_len);
109 4 : data->pseudonym_len = config->anonymous_identity_len;
110 : }
111 : }
112 :
113 104 : return data;
114 : }
115 :
116 :
117 : #ifdef EAP_AKA_PRIME
118 26 : static void * eap_aka_prime_init(struct eap_sm *sm)
119 : {
120 26 : struct eap_aka_data *data = eap_aka_init(sm);
121 26 : if (data == NULL)
122 0 : return NULL;
123 26 : data->eap_method = EAP_TYPE_AKA_PRIME;
124 26 : return data;
125 : }
126 : #endif /* EAP_AKA_PRIME */
127 :
128 :
129 126 : static void eap_aka_clear_keys(struct eap_aka_data *data, int reauth)
130 : {
131 126 : if (!reauth) {
132 104 : os_memset(data->mk, 0, EAP_SIM_MK_LEN);
133 104 : os_memset(data->k_aut, 0, EAP_AKA_PRIME_K_AUT_LEN);
134 104 : os_memset(data->k_encr, 0, EAP_SIM_K_ENCR_LEN);
135 104 : os_memset(data->k_re, 0, EAP_AKA_PRIME_K_RE_LEN);
136 : }
137 126 : os_memset(data->msk, 0, EAP_SIM_KEYING_DATA_LEN);
138 126 : os_memset(data->emsk, 0, EAP_EMSK_LEN);
139 126 : os_memset(data->autn, 0, EAP_AKA_AUTN_LEN);
140 126 : os_memset(data->auts, 0, EAP_AKA_AUTS_LEN);
141 126 : }
142 :
143 :
144 104 : static void eap_aka_deinit(struct eap_sm *sm, void *priv)
145 : {
146 104 : struct eap_aka_data *data = priv;
147 104 : if (data) {
148 104 : os_free(data->pseudonym);
149 104 : os_free(data->reauth_id);
150 104 : os_free(data->last_eap_identity);
151 104 : wpabuf_free(data->id_msgs);
152 104 : os_free(data->network_name);
153 104 : eap_aka_clear_keys(data, 0);
154 104 : os_free(data);
155 : }
156 104 : }
157 :
158 :
159 10 : static int eap_aka_ext_sim_req(struct eap_sm *sm, struct eap_aka_data *data)
160 : {
161 : char req[200], *pos, *end;
162 :
163 10 : wpa_printf(MSG_DEBUG, "EAP-AKA: Use external USIM processing");
164 10 : pos = req;
165 10 : end = pos + sizeof(req);
166 10 : pos += os_snprintf(pos, end - pos, "UMTS-AUTH");
167 10 : pos += os_snprintf(pos, end - pos, ":");
168 10 : pos += wpa_snprintf_hex(pos, end - pos, data->rand, EAP_AKA_RAND_LEN);
169 10 : pos += os_snprintf(pos, end - pos, ":");
170 10 : wpa_snprintf_hex(pos, end - pos, data->autn, EAP_AKA_AUTN_LEN);
171 :
172 10 : eap_sm_request_sim(sm, req);
173 10 : return 1;
174 : }
175 :
176 :
177 10 : static int eap_aka_ext_sim_result(struct eap_sm *sm, struct eap_aka_data *data,
178 : struct eap_peer_config *conf)
179 : {
180 : char *resp, *pos;
181 :
182 10 : wpa_printf(MSG_DEBUG,
183 : "EAP-AKA: Use result from external USIM processing");
184 :
185 10 : resp = conf->external_sim_resp;
186 10 : conf->external_sim_resp = NULL;
187 :
188 10 : if (os_strncmp(resp, "UMTS-AUTS:", 10) == 0) {
189 2 : pos = resp + 10;
190 2 : if (hexstr2bin(pos, data->auts, EAP_AKA_AUTS_LEN) < 0)
191 1 : goto invalid;
192 1 : wpa_hexdump_key(MSG_DEBUG, "EAP-AKA: AUTS", data->auts,
193 : EAP_AKA_AUTS_LEN);
194 1 : os_free(resp);
195 1 : return -2;
196 : }
197 :
198 8 : if (os_strncmp(resp, "UMTS-AUTH:", 10) != 0) {
199 1 : wpa_printf(MSG_DEBUG, "EAP-AKA: Unrecognized external USIM processing response");
200 1 : os_free(resp);
201 1 : return -1;
202 : }
203 :
204 7 : pos = resp + 10;
205 7 : wpa_hexdump(MSG_DEBUG, "EAP-AKA: RAND", data->rand, EAP_AKA_RAND_LEN);
206 :
207 7 : if (hexstr2bin(pos, data->ik, EAP_AKA_IK_LEN) < 0)
208 1 : goto invalid;
209 6 : wpa_hexdump_key(MSG_DEBUG, "EAP-AKA: IK", data->ik, EAP_AKA_IK_LEN);
210 6 : pos += EAP_AKA_IK_LEN * 2;
211 6 : if (*pos != ':')
212 1 : goto invalid;
213 5 : pos++;
214 :
215 5 : if (hexstr2bin(pos, data->ck, EAP_AKA_CK_LEN) < 0)
216 1 : goto invalid;
217 4 : wpa_hexdump_key(MSG_DEBUG, "EAP-AKA: CK", data->ck, EAP_AKA_CK_LEN);
218 4 : pos += EAP_AKA_CK_LEN * 2;
219 4 : if (*pos != ':')
220 1 : goto invalid;
221 3 : pos++;
222 :
223 3 : data->res_len = os_strlen(pos) / 2;
224 3 : if (data->res_len > EAP_AKA_RES_MAX_LEN) {
225 1 : data->res_len = 0;
226 1 : goto invalid;
227 : }
228 2 : if (hexstr2bin(pos, data->res, data->res_len) < 0)
229 1 : goto invalid;
230 1 : wpa_hexdump_key(MSG_DEBUG, "EAP-AKA: RES", data->res, data->res_len);
231 :
232 1 : os_free(resp);
233 1 : return 0;
234 :
235 : invalid:
236 7 : wpa_printf(MSG_DEBUG, "EAP-AKA: Invalid external USIM processing UMTS-AUTH response");
237 7 : os_free(resp);
238 7 : return -1;
239 : }
240 :
241 :
242 64 : static int eap_aka_umts_auth(struct eap_sm *sm, struct eap_aka_data *data)
243 : {
244 : struct eap_peer_config *conf;
245 :
246 64 : wpa_printf(MSG_DEBUG, "EAP-AKA: UMTS authentication algorithm");
247 :
248 64 : conf = eap_get_config(sm);
249 64 : if (conf == NULL)
250 0 : return -1;
251 :
252 64 : if (sm->external_sim) {
253 20 : if (conf->external_sim_resp)
254 10 : return eap_aka_ext_sim_result(sm, data, conf);
255 : else
256 10 : return eap_aka_ext_sim_req(sm, data);
257 : }
258 :
259 44 : if (conf->pcsc) {
260 0 : return scard_umts_auth(sm->scard_ctx, data->rand,
261 : data->autn, data->res, &data->res_len,
262 : data->ik, data->ck, data->auts);
263 : }
264 :
265 : #ifdef CONFIG_USIM_SIMULATOR
266 44 : if (conf->password) {
267 : u8 opc[16], k[16], sqn[6];
268 : const char *pos;
269 43 : wpa_printf(MSG_DEBUG, "EAP-AKA: Use internal Milenage "
270 : "implementation for UMTS authentication");
271 43 : if (conf->password_len < 78) {
272 1 : wpa_printf(MSG_DEBUG, "EAP-AKA: invalid Milenage "
273 : "password");
274 1 : return -1;
275 : }
276 42 : pos = (const char *) conf->password;
277 42 : if (hexstr2bin(pos, k, 16))
278 1 : return -1;
279 41 : pos += 32;
280 41 : if (*pos != ':')
281 1 : return -1;
282 40 : pos++;
283 :
284 40 : if (hexstr2bin(pos, opc, 16))
285 1 : return -1;
286 39 : pos += 32;
287 39 : if (*pos != ':')
288 1 : return -1;
289 38 : pos++;
290 :
291 38 : if (hexstr2bin(pos, sqn, 6))
292 1 : return -1;
293 :
294 74 : return milenage_check(opc, k, sqn, data->rand, data->autn,
295 37 : data->ik, data->ck,
296 74 : data->res, &data->res_len, data->auts);
297 : }
298 : #endif /* CONFIG_USIM_SIMULATOR */
299 :
300 : #ifdef CONFIG_USIM_HARDCODED
301 : wpa_printf(MSG_DEBUG, "EAP-AKA: Use hardcoded Kc and SRES values for "
302 : "testing");
303 :
304 : /* These hardcoded Kc and SRES values are used for testing.
305 : * Could consider making them configurable. */
306 : os_memset(data->res, '2', EAP_AKA_RES_MAX_LEN);
307 : data->res_len = EAP_AKA_RES_MAX_LEN;
308 : os_memset(data->ik, '3', EAP_AKA_IK_LEN);
309 : os_memset(data->ck, '4', EAP_AKA_CK_LEN);
310 : {
311 : u8 autn[EAP_AKA_AUTN_LEN];
312 : os_memset(autn, '1', EAP_AKA_AUTN_LEN);
313 : if (os_memcmp_const(autn, data->autn, EAP_AKA_AUTN_LEN) != 0) {
314 : wpa_printf(MSG_WARNING, "EAP-AKA: AUTN did not match "
315 : "with expected value");
316 : return -1;
317 : }
318 : }
319 : #if 0
320 : {
321 : static int test_resync = 1;
322 : if (test_resync) {
323 : /* Test Resynchronization */
324 : test_resync = 0;
325 : return -2;
326 : }
327 : }
328 : #endif
329 : return 0;
330 :
331 : #else /* CONFIG_USIM_HARDCODED */
332 :
333 1 : wpa_printf(MSG_DEBUG, "EAP-AKA: No UMTS authentication algorithm "
334 : "enabled");
335 1 : return -1;
336 :
337 : #endif /* CONFIG_USIM_HARDCODED */
338 : }
339 :
340 :
341 : #define CLEAR_PSEUDONYM 0x01
342 : #define CLEAR_REAUTH_ID 0x02
343 : #define CLEAR_EAP_ID 0x04
344 :
345 173 : static void eap_aka_clear_identities(struct eap_sm *sm,
346 : struct eap_aka_data *data, int id)
347 : {
348 173 : if ((id & CLEAR_PSEUDONYM) && data->pseudonym) {
349 3 : wpa_printf(MSG_DEBUG, "EAP-AKA: forgetting old pseudonym");
350 3 : os_free(data->pseudonym);
351 3 : data->pseudonym = NULL;
352 3 : data->pseudonym_len = 0;
353 3 : eap_set_anon_id(sm, NULL, 0);
354 : }
355 173 : if ((id & CLEAR_REAUTH_ID) && data->reauth_id) {
356 14 : wpa_printf(MSG_DEBUG, "EAP-AKA: forgetting old reauth_id");
357 14 : os_free(data->reauth_id);
358 14 : data->reauth_id = NULL;
359 14 : data->reauth_id_len = 0;
360 : }
361 173 : if ((id & CLEAR_EAP_ID) && data->last_eap_identity) {
362 2 : wpa_printf(MSG_DEBUG, "EAP-AKA: forgetting old eap_id");
363 2 : os_free(data->last_eap_identity);
364 2 : data->last_eap_identity = NULL;
365 2 : data->last_eap_identity_len = 0;
366 : }
367 173 : }
368 :
369 :
370 37 : static int eap_aka_learn_ids(struct eap_sm *sm, struct eap_aka_data *data,
371 : struct eap_sim_attrs *attr)
372 : {
373 37 : if (attr->next_pseudonym) {
374 27 : const u8 *identity = NULL;
375 27 : size_t identity_len = 0;
376 27 : const u8 *realm = NULL;
377 27 : size_t realm_len = 0;
378 :
379 54 : wpa_hexdump_ascii(MSG_DEBUG,
380 : "EAP-AKA: (encr) AT_NEXT_PSEUDONYM",
381 27 : attr->next_pseudonym,
382 : attr->next_pseudonym_len);
383 27 : os_free(data->pseudonym);
384 : /* Look for the realm of the permanent identity */
385 27 : identity = eap_get_config_identity(sm, &identity_len);
386 27 : if (identity) {
387 486 : for (realm = identity, realm_len = identity_len;
388 432 : realm_len > 0; realm_len--, realm++) {
389 437 : if (*realm == '@')
390 5 : break;
391 : }
392 : }
393 27 : data->pseudonym = os_malloc(attr->next_pseudonym_len +
394 : realm_len);
395 27 : if (data->pseudonym == NULL) {
396 0 : wpa_printf(MSG_INFO, "EAP-AKA: (encr) No memory for "
397 : "next pseudonym");
398 0 : data->pseudonym_len = 0;
399 0 : return -1;
400 : }
401 27 : os_memcpy(data->pseudonym, attr->next_pseudonym,
402 : attr->next_pseudonym_len);
403 27 : if (realm_len) {
404 5 : os_memcpy(data->pseudonym + attr->next_pseudonym_len,
405 : realm, realm_len);
406 : }
407 27 : data->pseudonym_len = attr->next_pseudonym_len + realm_len;
408 27 : eap_set_anon_id(sm, data->pseudonym, data->pseudonym_len);
409 : }
410 :
411 37 : if (attr->next_reauth_id) {
412 35 : os_free(data->reauth_id);
413 35 : data->reauth_id = os_malloc(attr->next_reauth_id_len);
414 35 : if (data->reauth_id == NULL) {
415 0 : wpa_printf(MSG_INFO, "EAP-AKA: (encr) No memory for "
416 : "next reauth_id");
417 0 : data->reauth_id_len = 0;
418 0 : return -1;
419 : }
420 35 : os_memcpy(data->reauth_id, attr->next_reauth_id,
421 : attr->next_reauth_id_len);
422 35 : data->reauth_id_len = attr->next_reauth_id_len;
423 70 : wpa_hexdump_ascii(MSG_DEBUG,
424 : "EAP-AKA: (encr) AT_NEXT_REAUTH_ID",
425 35 : data->reauth_id,
426 : data->reauth_id_len);
427 : }
428 :
429 37 : return 0;
430 : }
431 :
432 :
433 118 : static int eap_aka_add_id_msg(struct eap_aka_data *data,
434 : const struct wpabuf *msg)
435 : {
436 118 : if (msg == NULL)
437 0 : return -1;
438 :
439 118 : if (data->id_msgs == NULL) {
440 48 : data->id_msgs = wpabuf_dup(msg);
441 48 : return data->id_msgs == NULL ? -1 : 0;
442 : }
443 :
444 70 : if (wpabuf_resize(&data->id_msgs, wpabuf_len(msg)) < 0)
445 0 : return -1;
446 70 : wpabuf_put_buf(data->id_msgs, msg);
447 :
448 70 : return 0;
449 : }
450 :
451 :
452 39 : static void eap_aka_add_checkcode(struct eap_aka_data *data,
453 : struct eap_sim_msg *msg)
454 : {
455 : const u8 *addr;
456 : size_t len;
457 : u8 hash[SHA256_MAC_LEN];
458 :
459 39 : wpa_printf(MSG_DEBUG, " AT_CHECKCODE");
460 :
461 39 : if (data->id_msgs == NULL) {
462 : /*
463 : * No EAP-AKA/Identity packets were exchanged - send empty
464 : * checkcode.
465 : */
466 14 : eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, NULL, 0);
467 53 : return;
468 : }
469 :
470 : /* Checkcode is SHA1/SHA256 hash over all EAP-AKA/Identity packets. */
471 25 : addr = wpabuf_head(data->id_msgs);
472 25 : len = wpabuf_len(data->id_msgs);
473 25 : wpa_hexdump(MSG_MSGDUMP, "EAP-AKA: AT_CHECKCODE data", addr, len);
474 : #ifdef EAP_AKA_PRIME
475 25 : if (data->eap_method == EAP_TYPE_AKA_PRIME)
476 11 : sha256_vector(1, &addr, &len, hash);
477 : else
478 : #endif /* EAP_AKA_PRIME */
479 14 : sha1_vector(1, &addr, &len, hash);
480 :
481 25 : eap_sim_msg_add(msg, EAP_SIM_AT_CHECKCODE, 0, hash,
482 25 : data->eap_method == EAP_TYPE_AKA_PRIME ?
483 : EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN);
484 : }
485 :
486 :
487 78 : static int eap_aka_verify_checkcode(struct eap_aka_data *data,
488 : const u8 *checkcode, size_t checkcode_len)
489 : {
490 : const u8 *addr;
491 : size_t len;
492 : u8 hash[SHA256_MAC_LEN];
493 : size_t hash_len;
494 :
495 78 : if (checkcode == NULL)
496 0 : return -1;
497 :
498 78 : if (data->id_msgs == NULL) {
499 18 : if (checkcode_len != 0) {
500 2 : wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from server "
501 : "indicates that AKA/Identity messages were "
502 : "used, but they were not");
503 2 : return -1;
504 : }
505 16 : return 0;
506 : }
507 :
508 60 : hash_len = data->eap_method == EAP_TYPE_AKA_PRIME ?
509 : EAP_AKA_PRIME_CHECKCODE_LEN : EAP_AKA_CHECKCODE_LEN;
510 :
511 60 : if (checkcode_len != hash_len) {
512 1 : wpa_printf(MSG_DEBUG, "EAP-AKA: Checkcode from server "
513 : "indicates that AKA/Identity message were not "
514 : "used, but they were");
515 1 : return -1;
516 : }
517 :
518 : /* Checkcode is SHA1/SHA256 hash over all EAP-AKA/Identity packets. */
519 59 : addr = wpabuf_head(data->id_msgs);
520 59 : len = wpabuf_len(data->id_msgs);
521 : #ifdef EAP_AKA_PRIME
522 59 : if (data->eap_method == EAP_TYPE_AKA_PRIME)
523 12 : sha256_vector(1, &addr, &len, hash);
524 : else
525 : #endif /* EAP_AKA_PRIME */
526 47 : sha1_vector(1, &addr, &len, hash);
527 :
528 59 : if (os_memcmp_const(hash, checkcode, hash_len) != 0) {
529 1 : wpa_printf(MSG_DEBUG, "EAP-AKA: Mismatch in AT_CHECKCODE");
530 1 : return -1;
531 : }
532 :
533 58 : return 0;
534 : }
535 :
536 :
537 52 : static struct wpabuf * eap_aka_client_error(struct eap_aka_data *data, u8 id,
538 : int err)
539 : {
540 : struct eap_sim_msg *msg;
541 :
542 52 : eap_aka_state(data, FAILURE);
543 52 : data->num_id_req = 0;
544 52 : data->num_notification = 0;
545 :
546 52 : wpa_printf(MSG_DEBUG, "EAP-AKA: Send Client-Error (error code %d)",
547 : err);
548 52 : msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
549 : EAP_AKA_SUBTYPE_CLIENT_ERROR);
550 52 : eap_sim_msg_add(msg, EAP_SIM_AT_CLIENT_ERROR_CODE, err, NULL, 0);
551 52 : return eap_sim_msg_finish(msg, data->eap_method, NULL, NULL, 0);
552 : }
553 :
554 :
555 28 : static struct wpabuf * eap_aka_authentication_reject(struct eap_aka_data *data,
556 : u8 id)
557 : {
558 : struct eap_sim_msg *msg;
559 :
560 28 : eap_aka_state(data, FAILURE);
561 28 : data->num_id_req = 0;
562 28 : data->num_notification = 0;
563 :
564 28 : wpa_printf(MSG_DEBUG, "Generating EAP-AKA Authentication-Reject "
565 : "(id=%d)", id);
566 28 : msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
567 : EAP_AKA_SUBTYPE_AUTHENTICATION_REJECT);
568 28 : return eap_sim_msg_finish(msg, data->eap_method, NULL, NULL, 0);
569 : }
570 :
571 :
572 5 : static struct wpabuf * eap_aka_synchronization_failure(
573 : struct eap_aka_data *data, u8 id)
574 : {
575 : struct eap_sim_msg *msg;
576 :
577 5 : data->num_id_req = 0;
578 5 : data->num_notification = 0;
579 :
580 5 : wpa_printf(MSG_DEBUG, "Generating EAP-AKA Synchronization-Failure "
581 : "(id=%d)", id);
582 5 : msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
583 : EAP_AKA_SUBTYPE_SYNCHRONIZATION_FAILURE);
584 5 : wpa_printf(MSG_DEBUG, " AT_AUTS");
585 5 : eap_sim_msg_add_full(msg, EAP_SIM_AT_AUTS, data->auts,
586 : EAP_AKA_AUTS_LEN);
587 5 : return eap_sim_msg_finish(msg, data->eap_method, NULL, NULL, 0);
588 : }
589 :
590 :
591 59 : static struct wpabuf * eap_aka_response_identity(struct eap_sm *sm,
592 : struct eap_aka_data *data,
593 : u8 id,
594 : enum eap_sim_id_req id_req)
595 : {
596 59 : const u8 *identity = NULL;
597 59 : size_t identity_len = 0;
598 : struct eap_sim_msg *msg;
599 :
600 59 : data->reauth = 0;
601 59 : if (id_req == ANY_ID && data->reauth_id) {
602 4 : identity = data->reauth_id;
603 4 : identity_len = data->reauth_id_len;
604 4 : data->reauth = 1;
605 105 : } else if ((id_req == ANY_ID || id_req == FULLAUTH_ID) &&
606 50 : data->pseudonym) {
607 8 : identity = data->pseudonym;
608 8 : identity_len = data->pseudonym_len;
609 8 : eap_aka_clear_identities(sm, data, CLEAR_REAUTH_ID);
610 47 : } else if (id_req != NO_ID_REQ) {
611 46 : identity = eap_get_config_identity(sm, &identity_len);
612 46 : if (identity) {
613 46 : eap_aka_clear_identities(sm, data, CLEAR_PSEUDONYM |
614 : CLEAR_REAUTH_ID);
615 : }
616 : }
617 59 : if (id_req != NO_ID_REQ)
618 58 : eap_aka_clear_identities(sm, data, CLEAR_EAP_ID);
619 :
620 59 : wpa_printf(MSG_DEBUG, "Generating EAP-AKA Identity (id=%d)", id);
621 59 : msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
622 : EAP_AKA_SUBTYPE_IDENTITY);
623 :
624 59 : if (identity) {
625 58 : wpa_hexdump_ascii(MSG_DEBUG, " AT_IDENTITY",
626 : identity, identity_len);
627 58 : eap_sim_msg_add(msg, EAP_SIM_AT_IDENTITY, identity_len,
628 : identity, identity_len);
629 : }
630 :
631 59 : return eap_sim_msg_finish(msg, data->eap_method, NULL, NULL, 0);
632 : }
633 :
634 :
635 27 : static struct wpabuf * eap_aka_response_challenge(struct eap_aka_data *data,
636 : u8 id)
637 : {
638 : struct eap_sim_msg *msg;
639 :
640 27 : wpa_printf(MSG_DEBUG, "Generating EAP-AKA Challenge (id=%d)", id);
641 27 : msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
642 : EAP_AKA_SUBTYPE_CHALLENGE);
643 27 : wpa_printf(MSG_DEBUG, " AT_RES");
644 54 : eap_sim_msg_add(msg, EAP_SIM_AT_RES, data->res_len * 8,
645 27 : data->res, data->res_len);
646 27 : eap_aka_add_checkcode(data, msg);
647 27 : if (data->use_result_ind) {
648 2 : wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
649 2 : eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
650 : }
651 27 : wpa_printf(MSG_DEBUG, " AT_MAC");
652 27 : eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
653 27 : return eap_sim_msg_finish(msg, data->eap_method, data->k_aut, (u8 *) "",
654 : 0);
655 : }
656 :
657 :
658 12 : static struct wpabuf * eap_aka_response_reauth(struct eap_aka_data *data,
659 : u8 id, int counter_too_small,
660 : const u8 *nonce_s)
661 : {
662 : struct eap_sim_msg *msg;
663 : unsigned int counter;
664 :
665 12 : wpa_printf(MSG_DEBUG, "Generating EAP-AKA Reauthentication (id=%d)",
666 : id);
667 12 : msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
668 : EAP_AKA_SUBTYPE_REAUTHENTICATION);
669 12 : wpa_printf(MSG_DEBUG, " AT_IV");
670 12 : wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
671 12 : eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA);
672 :
673 12 : if (counter_too_small) {
674 2 : wpa_printf(MSG_DEBUG, " *AT_COUNTER_TOO_SMALL");
675 2 : eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER_TOO_SMALL, 0, NULL, 0);
676 2 : counter = data->counter_too_small;
677 : } else
678 10 : counter = data->counter;
679 :
680 12 : wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", counter);
681 12 : eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0);
682 :
683 12 : if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) {
684 0 : wpa_printf(MSG_WARNING, "EAP-AKA: Failed to encrypt "
685 : "AT_ENCR_DATA");
686 0 : eap_sim_msg_free(msg);
687 0 : return NULL;
688 : }
689 12 : eap_aka_add_checkcode(data, msg);
690 12 : if (data->use_result_ind) {
691 2 : wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
692 2 : eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
693 : }
694 12 : wpa_printf(MSG_DEBUG, " AT_MAC");
695 12 : eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
696 12 : return eap_sim_msg_finish(msg, data->eap_method, data->k_aut, nonce_s,
697 : EAP_SIM_NONCE_S_LEN);
698 : }
699 :
700 :
701 8 : static struct wpabuf * eap_aka_response_notification(struct eap_aka_data *data,
702 : u8 id, u16 notification)
703 : {
704 : struct eap_sim_msg *msg;
705 8 : u8 *k_aut = (notification & 0x4000) == 0 ? data->k_aut : NULL;
706 :
707 8 : wpa_printf(MSG_DEBUG, "Generating EAP-AKA Notification (id=%d)", id);
708 8 : msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
709 : EAP_AKA_SUBTYPE_NOTIFICATION);
710 8 : if (k_aut && data->reauth) {
711 2 : wpa_printf(MSG_DEBUG, " AT_IV");
712 2 : wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
713 2 : eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV,
714 : EAP_SIM_AT_ENCR_DATA);
715 2 : wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", data->counter);
716 2 : eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter,
717 : NULL, 0);
718 2 : if (eap_sim_msg_add_encr_end(msg, data->k_encr,
719 : EAP_SIM_AT_PADDING)) {
720 0 : wpa_printf(MSG_WARNING, "EAP-AKA: Failed to encrypt "
721 : "AT_ENCR_DATA");
722 0 : eap_sim_msg_free(msg);
723 0 : return NULL;
724 : }
725 : }
726 8 : if (k_aut) {
727 5 : wpa_printf(MSG_DEBUG, " AT_MAC");
728 5 : eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
729 : }
730 8 : return eap_sim_msg_finish(msg, data->eap_method, k_aut, (u8 *) "", 0);
731 : }
732 :
733 :
734 62 : static struct wpabuf * eap_aka_process_identity(struct eap_sm *sm,
735 : struct eap_aka_data *data,
736 : u8 id,
737 : const struct wpabuf *reqData,
738 : struct eap_sim_attrs *attr)
739 : {
740 : int id_error;
741 : struct wpabuf *buf;
742 :
743 62 : wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Identity");
744 :
745 62 : id_error = 0;
746 62 : switch (attr->id_req) {
747 : case NO_ID_REQ:
748 1 : break;
749 : case ANY_ID:
750 49 : if (data->num_id_req > 0)
751 1 : id_error++;
752 49 : data->num_id_req++;
753 49 : break;
754 : case FULLAUTH_ID:
755 7 : if (data->num_id_req > 1)
756 1 : id_error++;
757 7 : data->num_id_req++;
758 7 : break;
759 : case PERMANENT_ID:
760 5 : if (data->num_id_req > 2)
761 1 : id_error++;
762 5 : data->num_id_req++;
763 5 : break;
764 : }
765 62 : if (id_error) {
766 3 : wpa_printf(MSG_INFO, "EAP-AKA: Too many ID requests "
767 : "used within one authentication");
768 3 : return eap_aka_client_error(data, id,
769 : EAP_AKA_UNABLE_TO_PROCESS_PACKET);
770 : }
771 :
772 59 : buf = eap_aka_response_identity(sm, data, id, attr->id_req);
773 :
774 59 : if (data->prev_id != id) {
775 59 : eap_aka_add_id_msg(data, reqData);
776 59 : eap_aka_add_id_msg(data, buf);
777 59 : data->prev_id = id;
778 : }
779 :
780 59 : return buf;
781 : }
782 :
783 :
784 50 : static int eap_aka_verify_mac(struct eap_aka_data *data,
785 : const struct wpabuf *req,
786 : const u8 *mac, const u8 *extra,
787 : size_t extra_len)
788 : {
789 50 : if (data->eap_method == EAP_TYPE_AKA_PRIME)
790 23 : return eap_sim_verify_mac_sha256(data->k_aut, req, mac, extra,
791 : extra_len);
792 27 : return eap_sim_verify_mac(data->k_aut, req, mac, extra, extra_len);
793 : }
794 :
795 :
796 : #ifdef EAP_AKA_PRIME
797 4 : static struct wpabuf * eap_aka_prime_kdf_select(struct eap_aka_data *data,
798 : u8 id, u16 kdf)
799 : {
800 : struct eap_sim_msg *msg;
801 :
802 4 : data->kdf_negotiation = 1;
803 4 : data->kdf = kdf;
804 4 : wpa_printf(MSG_DEBUG, "Generating EAP-AKA Challenge (id=%d) (KDF "
805 : "select)", id);
806 4 : msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, data->eap_method,
807 : EAP_AKA_SUBTYPE_CHALLENGE);
808 4 : wpa_printf(MSG_DEBUG, " AT_KDF");
809 4 : eap_sim_msg_add(msg, EAP_SIM_AT_KDF, kdf, NULL, 0);
810 4 : return eap_sim_msg_finish(msg, data->eap_method, NULL, NULL, 0);
811 : }
812 :
813 :
814 5 : static struct wpabuf * eap_aka_prime_kdf_neg(struct eap_aka_data *data,
815 : u8 id, struct eap_sim_attrs *attr)
816 : {
817 : size_t i;
818 :
819 15 : for (i = 0; i < attr->kdf_count; i++) {
820 14 : if (attr->kdf[i] == EAP_AKA_PRIME_KDF)
821 4 : return eap_aka_prime_kdf_select(data, id,
822 : EAP_AKA_PRIME_KDF);
823 : }
824 :
825 : /* No matching KDF found - fail authentication as if AUTN had been
826 : * incorrect */
827 1 : return eap_aka_authentication_reject(data, id);
828 : }
829 :
830 :
831 27 : static int eap_aka_prime_kdf_valid(struct eap_aka_data *data,
832 : struct eap_sim_attrs *attr)
833 : {
834 : size_t i, j;
835 :
836 27 : if (attr->kdf_count == 0)
837 1 : return 0;
838 :
839 : /* The only allowed (and required) duplication of a KDF is the addition
840 : * of the selected KDF into the beginning of the list. */
841 :
842 26 : if (data->kdf_negotiation) {
843 4 : if (attr->kdf[0] != data->kdf) {
844 1 : wpa_printf(MSG_WARNING, "EAP-AKA': The server did not "
845 : "accept the selected KDF");
846 1 : return 0;
847 : }
848 :
849 9 : for (i = 1; i < attr->kdf_count; i++) {
850 8 : if (attr->kdf[i] == data->kdf)
851 2 : break;
852 : }
853 4 : if (i == attr->kdf_count &&
854 1 : attr->kdf_count < EAP_AKA_PRIME_KDF_MAX) {
855 1 : wpa_printf(MSG_WARNING, "EAP-AKA': The server did not "
856 : "duplicate the selected KDF");
857 1 : return 0;
858 : }
859 :
860 : /* TODO: should check that the list is identical to the one
861 : * used in the previous Challenge message apart from the added
862 : * entry in the beginning. */
863 : }
864 :
865 57 : for (i = data->kdf ? 1 : 0; i < attr->kdf_count; i++) {
866 54 : for (j = i + 1; j < attr->kdf_count; j++) {
867 21 : if (attr->kdf[i] == attr->kdf[j]) {
868 1 : wpa_printf(MSG_WARNING, "EAP-AKA': The server "
869 : "included a duplicated KDF");
870 1 : return 0;
871 : }
872 : }
873 : }
874 :
875 23 : return 1;
876 : }
877 : #endif /* EAP_AKA_PRIME */
878 :
879 :
880 82 : static struct wpabuf * eap_aka_process_challenge(struct eap_sm *sm,
881 : struct eap_aka_data *data,
882 : u8 id,
883 : const struct wpabuf *reqData,
884 : struct eap_sim_attrs *attr)
885 : {
886 : const u8 *identity;
887 : size_t identity_len;
888 : int res;
889 : struct eap_sim_attrs eattr;
890 :
891 82 : wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Challenge");
892 :
893 145 : if (attr->checkcode &&
894 63 : eap_aka_verify_checkcode(data, attr->checkcode,
895 : attr->checkcode_len)) {
896 3 : wpa_printf(MSG_WARNING, "EAP-AKA: Invalid AT_CHECKCODE in the "
897 : "message");
898 3 : return eap_aka_client_error(data, id,
899 : EAP_AKA_UNABLE_TO_PROCESS_PACKET);
900 : }
901 :
902 : #ifdef EAP_AKA_PRIME
903 79 : if (data->eap_method == EAP_TYPE_AKA_PRIME) {
904 30 : if (!attr->kdf_input || attr->kdf_input_len == 0) {
905 3 : wpa_printf(MSG_WARNING, "EAP-AKA': Challenge message "
906 : "did not include non-empty AT_KDF_INPUT");
907 : /* Fail authentication as if AUTN had been incorrect */
908 3 : return eap_aka_authentication_reject(data, id);
909 : }
910 27 : os_free(data->network_name);
911 27 : data->network_name = os_malloc(attr->kdf_input_len);
912 27 : if (data->network_name == NULL) {
913 0 : wpa_printf(MSG_WARNING, "EAP-AKA': No memory for "
914 : "storing Network Name");
915 0 : return eap_aka_authentication_reject(data, id);
916 : }
917 27 : os_memcpy(data->network_name, attr->kdf_input,
918 : attr->kdf_input_len);
919 27 : data->network_name_len = attr->kdf_input_len;
920 54 : wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA': Network Name "
921 : "(AT_KDF_INPUT)",
922 27 : data->network_name, data->network_name_len);
923 : /* TODO: check Network Name per 3GPP.33.402 */
924 :
925 27 : if (!eap_aka_prime_kdf_valid(data, attr))
926 4 : return eap_aka_authentication_reject(data, id);
927 :
928 23 : if (attr->kdf[0] != EAP_AKA_PRIME_KDF)
929 5 : return eap_aka_prime_kdf_neg(data, id, attr);
930 :
931 18 : data->kdf = EAP_AKA_PRIME_KDF;
932 18 : wpa_printf(MSG_DEBUG, "EAP-AKA': KDF %d selected", data->kdf);
933 : }
934 :
935 67 : if (data->eap_method == EAP_TYPE_AKA && attr->bidding) {
936 48 : u16 flags = WPA_GET_BE16(attr->bidding);
937 49 : if ((flags & EAP_AKA_BIDDING_FLAG_D) &&
938 1 : eap_allowed_method(sm, EAP_VENDOR_IETF,
939 : EAP_TYPE_AKA_PRIME)) {
940 1 : wpa_printf(MSG_WARNING, "EAP-AKA: Bidding down from "
941 : "AKA' to AKA detected");
942 : /* Fail authentication as if AUTN had been incorrect */
943 1 : return eap_aka_authentication_reject(data, id);
944 : }
945 : }
946 : #endif /* EAP_AKA_PRIME */
947 :
948 66 : data->reauth = 0;
949 66 : if (!attr->mac || !attr->rand || !attr->autn) {
950 6 : wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message "
951 : "did not include%s%s%s",
952 2 : !attr->mac ? " AT_MAC" : "",
953 2 : !attr->rand ? " AT_RAND" : "",
954 2 : !attr->autn ? " AT_AUTN" : "");
955 2 : return eap_aka_client_error(data, id,
956 : EAP_AKA_UNABLE_TO_PROCESS_PACKET);
957 : }
958 64 : os_memcpy(data->rand, attr->rand, EAP_AKA_RAND_LEN);
959 64 : os_memcpy(data->autn, attr->autn, EAP_AKA_AUTN_LEN);
960 :
961 64 : res = eap_aka_umts_auth(sm, data);
962 64 : if (res == -1) {
963 18 : wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication "
964 : "failed (AUTN)");
965 18 : return eap_aka_authentication_reject(data, id);
966 46 : } else if (res == -2) {
967 5 : wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication "
968 : "failed (AUTN seq# -> AUTS)");
969 5 : return eap_aka_synchronization_failure(data, id);
970 41 : } else if (res > 0) {
971 10 : wpa_printf(MSG_DEBUG, "EAP-AKA: Wait for external USIM processing");
972 10 : return NULL;
973 31 : } else if (res) {
974 0 : wpa_printf(MSG_WARNING, "EAP-AKA: UMTS authentication failed");
975 0 : return eap_aka_client_error(data, id,
976 : EAP_AKA_UNABLE_TO_PROCESS_PACKET);
977 : }
978 : #ifdef EAP_AKA_PRIME
979 31 : if (data->eap_method == EAP_TYPE_AKA_PRIME) {
980 : /* Note: AUTN = (SQN ^ AK) || AMF || MAC which gives us the
981 : * needed 6-octet SQN ^ AK for CK',IK' derivation */
982 15 : u16 amf = WPA_GET_BE16(data->autn + 6);
983 15 : if (!(amf & 0x8000)) {
984 1 : wpa_printf(MSG_WARNING, "EAP-AKA': AMF separation bit "
985 : "not set (AMF=0x%4x)", amf);
986 1 : return eap_aka_authentication_reject(data, id);
987 : }
988 28 : eap_aka_prime_derive_ck_ik_prime(data->ck, data->ik,
989 14 : data->autn,
990 14 : data->network_name,
991 : data->network_name_len);
992 : }
993 : #endif /* EAP_AKA_PRIME */
994 30 : if (data->last_eap_identity) {
995 2 : identity = data->last_eap_identity;
996 2 : identity_len = data->last_eap_identity_len;
997 28 : } else if (data->pseudonym) {
998 5 : identity = data->pseudonym;
999 5 : identity_len = data->pseudonym_len;
1000 : } else
1001 23 : identity = eap_get_config_identity(sm, &identity_len);
1002 30 : wpa_hexdump_ascii(MSG_DEBUG, "EAP-AKA: Selected identity for MK "
1003 : "derivation", identity, identity_len);
1004 30 : if (data->eap_method == EAP_TYPE_AKA_PRIME) {
1005 14 : eap_aka_prime_derive_keys(identity, identity_len, data->ik,
1006 14 : data->ck, data->k_encr, data->k_aut,
1007 14 : data->k_re, data->msk, data->emsk);
1008 : } else {
1009 16 : eap_aka_derive_mk(identity, identity_len, data->ik, data->ck,
1010 16 : data->mk);
1011 16 : eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut,
1012 16 : data->msk, data->emsk);
1013 : }
1014 30 : if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
1015 3 : wpa_printf(MSG_WARNING, "EAP-AKA: Challenge message "
1016 : "used invalid AT_MAC");
1017 3 : return eap_aka_client_error(data, id,
1018 : EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1019 : }
1020 :
1021 : /* Old reauthentication identity must not be used anymore. In
1022 : * other words, if no new identities are received, full
1023 : * authentication will be used on next reauthentication (using
1024 : * pseudonym identity or permanent identity). */
1025 27 : eap_aka_clear_identities(sm, data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
1026 :
1027 27 : if (attr->encr_data) {
1028 : u8 *decrypted;
1029 27 : decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
1030 : attr->encr_data_len, attr->iv,
1031 : &eattr, 0);
1032 27 : if (decrypted == NULL) {
1033 0 : return eap_aka_client_error(
1034 : data, id, EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1035 : }
1036 27 : eap_aka_learn_ids(sm, data, &eattr);
1037 27 : os_free(decrypted);
1038 : }
1039 :
1040 27 : if (data->result_ind && attr->result_ind)
1041 2 : data->use_result_ind = 1;
1042 :
1043 27 : if (data->state != FAILURE) {
1044 27 : eap_aka_state(data, data->use_result_ind ?
1045 : RESULT_SUCCESS : SUCCESS);
1046 : }
1047 :
1048 27 : data->num_id_req = 0;
1049 27 : data->num_notification = 0;
1050 : /* RFC 4187 specifies that counter is initialized to one after
1051 : * fullauth, but initializing it to zero makes it easier to implement
1052 : * reauth verification. */
1053 27 : data->counter = 0;
1054 27 : return eap_aka_response_challenge(data, id);
1055 : }
1056 :
1057 :
1058 2 : static int eap_aka_process_notification_reauth(struct eap_aka_data *data,
1059 : struct eap_sim_attrs *attr)
1060 : {
1061 : struct eap_sim_attrs eattr;
1062 : u8 *decrypted;
1063 :
1064 2 : if (attr->encr_data == NULL || attr->iv == NULL) {
1065 0 : wpa_printf(MSG_WARNING, "EAP-AKA: Notification message after "
1066 : "reauth did not include encrypted data");
1067 0 : return -1;
1068 : }
1069 :
1070 2 : decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
1071 : attr->encr_data_len, attr->iv, &eattr,
1072 : 0);
1073 2 : if (decrypted == NULL) {
1074 0 : wpa_printf(MSG_WARNING, "EAP-AKA: Failed to parse encrypted "
1075 : "data from notification message");
1076 0 : return -1;
1077 : }
1078 :
1079 2 : if (eattr.counter < 0 || (size_t) eattr.counter != data->counter) {
1080 0 : wpa_printf(MSG_WARNING, "EAP-AKA: Counter in notification "
1081 : "message does not match with counter in reauth "
1082 : "message");
1083 0 : os_free(decrypted);
1084 0 : return -1;
1085 : }
1086 :
1087 2 : os_free(decrypted);
1088 2 : return 0;
1089 : }
1090 :
1091 :
1092 7 : static int eap_aka_process_notification_auth(struct eap_aka_data *data,
1093 : const struct wpabuf *reqData,
1094 : struct eap_sim_attrs *attr)
1095 : {
1096 7 : if (attr->mac == NULL) {
1097 1 : wpa_printf(MSG_INFO, "EAP-AKA: no AT_MAC in after_auth "
1098 : "Notification message");
1099 1 : return -1;
1100 : }
1101 :
1102 6 : if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
1103 1 : wpa_printf(MSG_WARNING, "EAP-AKA: Notification message "
1104 : "used invalid AT_MAC");
1105 1 : return -1;
1106 : }
1107 :
1108 7 : if (data->reauth &&
1109 2 : eap_aka_process_notification_reauth(data, attr)) {
1110 0 : wpa_printf(MSG_WARNING, "EAP-AKA: Invalid notification "
1111 : "message after reauth");
1112 0 : return -1;
1113 : }
1114 :
1115 5 : return 0;
1116 : }
1117 :
1118 :
1119 12 : static struct wpabuf * eap_aka_process_notification(
1120 : struct eap_sm *sm, struct eap_aka_data *data, u8 id,
1121 : const struct wpabuf *reqData, struct eap_sim_attrs *attr)
1122 : {
1123 12 : wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Notification");
1124 12 : if (data->num_notification > 0) {
1125 1 : wpa_printf(MSG_INFO, "EAP-AKA: too many notification "
1126 : "rounds (only one allowed)");
1127 1 : return eap_aka_client_error(data, id,
1128 : EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1129 : }
1130 11 : data->num_notification++;
1131 11 : if (attr->notification == -1) {
1132 1 : wpa_printf(MSG_INFO, "EAP-AKA: no AT_NOTIFICATION in "
1133 : "Notification message");
1134 1 : return eap_aka_client_error(data, id,
1135 : EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1136 : }
1137 :
1138 17 : if ((attr->notification & 0x4000) == 0 &&
1139 7 : eap_aka_process_notification_auth(data, reqData, attr)) {
1140 2 : return eap_aka_client_error(data, id,
1141 : EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1142 : }
1143 :
1144 8 : eap_sim_report_notification(sm->msg_ctx, attr->notification, 1);
1145 8 : if (attr->notification >= 0 && attr->notification < 32768) {
1146 2 : eap_aka_state(data, FAILURE);
1147 11 : } else if (attr->notification == EAP_SIM_SUCCESS &&
1148 5 : data->state == RESULT_SUCCESS)
1149 4 : eap_aka_state(data, SUCCESS);
1150 8 : return eap_aka_response_notification(data, id, attr->notification);
1151 : }
1152 :
1153 :
1154 16 : static struct wpabuf * eap_aka_process_reauthentication(
1155 : struct eap_sm *sm, struct eap_aka_data *data, u8 id,
1156 : const struct wpabuf *reqData, struct eap_sim_attrs *attr)
1157 : {
1158 : struct eap_sim_attrs eattr;
1159 : u8 *decrypted;
1160 :
1161 16 : wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Reauthentication");
1162 :
1163 31 : if (attr->checkcode &&
1164 15 : eap_aka_verify_checkcode(data, attr->checkcode,
1165 : attr->checkcode_len)) {
1166 1 : wpa_printf(MSG_WARNING, "EAP-AKA: Invalid AT_CHECKCODE in the "
1167 : "message");
1168 1 : return eap_aka_client_error(data, id,
1169 : EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1170 : }
1171 :
1172 15 : if (data->reauth_id == NULL) {
1173 1 : wpa_printf(MSG_WARNING, "EAP-AKA: Server is trying "
1174 : "reauthentication, but no reauth_id available");
1175 1 : return eap_aka_client_error(data, id,
1176 : EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1177 : }
1178 :
1179 14 : data->reauth = 1;
1180 14 : if (eap_aka_verify_mac(data, reqData, attr->mac, (u8 *) "", 0)) {
1181 2 : wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication "
1182 : "did not have valid AT_MAC");
1183 2 : return eap_aka_client_error(data, id,
1184 : EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1185 : }
1186 :
1187 12 : if (attr->encr_data == NULL || attr->iv == NULL) {
1188 0 : wpa_printf(MSG_WARNING, "EAP-AKA: Reauthentication "
1189 : "message did not include encrypted data");
1190 0 : return eap_aka_client_error(data, id,
1191 : EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1192 : }
1193 :
1194 12 : decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
1195 : attr->encr_data_len, attr->iv, &eattr,
1196 : 0);
1197 12 : if (decrypted == NULL) {
1198 0 : wpa_printf(MSG_WARNING, "EAP-AKA: Failed to parse encrypted "
1199 : "data from reauthentication message");
1200 0 : return eap_aka_client_error(data, id,
1201 : EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1202 : }
1203 :
1204 12 : if (eattr.nonce_s == NULL || eattr.counter < 0) {
1205 0 : wpa_printf(MSG_INFO, "EAP-AKA: (encr) No%s%s in reauth packet",
1206 0 : !eattr.nonce_s ? " AT_NONCE_S" : "",
1207 0 : eattr.counter < 0 ? " AT_COUNTER" : "");
1208 0 : os_free(decrypted);
1209 0 : return eap_aka_client_error(data, id,
1210 : EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1211 : }
1212 :
1213 12 : if (eattr.counter < 0 || (size_t) eattr.counter <= data->counter) {
1214 : struct wpabuf *res;
1215 2 : wpa_printf(MSG_INFO, "EAP-AKA: (encr) Invalid counter "
1216 : "(%d <= %d)", eattr.counter, data->counter);
1217 2 : data->counter_too_small = eattr.counter;
1218 :
1219 : /* Reply using Re-auth w/ AT_COUNTER_TOO_SMALL. The current
1220 : * reauth_id must not be used to start a new reauthentication.
1221 : * However, since it was used in the last EAP-Response-Identity
1222 : * packet, it has to saved for the following fullauth to be
1223 : * used in MK derivation. */
1224 2 : os_free(data->last_eap_identity);
1225 2 : data->last_eap_identity = data->reauth_id;
1226 2 : data->last_eap_identity_len = data->reauth_id_len;
1227 2 : data->reauth_id = NULL;
1228 2 : data->reauth_id_len = 0;
1229 :
1230 2 : res = eap_aka_response_reauth(data, id, 1, eattr.nonce_s);
1231 2 : os_free(decrypted);
1232 :
1233 2 : return res;
1234 : }
1235 10 : data->counter = eattr.counter;
1236 :
1237 10 : os_memcpy(data->nonce_s, eattr.nonce_s, EAP_SIM_NONCE_S_LEN);
1238 10 : wpa_hexdump(MSG_DEBUG, "EAP-AKA: (encr) AT_NONCE_S",
1239 10 : data->nonce_s, EAP_SIM_NONCE_S_LEN);
1240 :
1241 10 : if (data->eap_method == EAP_TYPE_AKA_PRIME) {
1242 10 : eap_aka_prime_derive_keys_reauth(data->k_re, data->counter,
1243 5 : data->reauth_id,
1244 : data->reauth_id_len,
1245 5 : data->nonce_s,
1246 5 : data->msk, data->emsk);
1247 : } else {
1248 5 : eap_sim_derive_keys_reauth(data->counter, data->reauth_id,
1249 : data->reauth_id_len,
1250 5 : data->nonce_s, data->mk,
1251 5 : data->msk, data->emsk);
1252 : }
1253 10 : eap_aka_clear_identities(sm, data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
1254 10 : eap_aka_learn_ids(sm, data, &eattr);
1255 :
1256 10 : if (data->result_ind && attr->result_ind)
1257 2 : data->use_result_ind = 1;
1258 :
1259 10 : if (data->state != FAILURE) {
1260 10 : eap_aka_state(data, data->use_result_ind ?
1261 : RESULT_SUCCESS : SUCCESS);
1262 : }
1263 :
1264 10 : data->num_id_req = 0;
1265 10 : data->num_notification = 0;
1266 10 : if (data->counter > EAP_AKA_MAX_FAST_REAUTHS) {
1267 2 : wpa_printf(MSG_DEBUG, "EAP-AKA: Maximum number of "
1268 : "fast reauths performed - force fullauth");
1269 2 : eap_aka_clear_identities(sm, data,
1270 : CLEAR_REAUTH_ID | CLEAR_EAP_ID);
1271 : }
1272 10 : os_free(decrypted);
1273 10 : return eap_aka_response_reauth(data, id, 0, data->nonce_s);
1274 : }
1275 :
1276 :
1277 207 : static struct wpabuf * eap_aka_process(struct eap_sm *sm, void *priv,
1278 : struct eap_method_ret *ret,
1279 : const struct wpabuf *reqData)
1280 : {
1281 207 : struct eap_aka_data *data = priv;
1282 : const struct eap_hdr *req;
1283 : u8 subtype, id;
1284 : struct wpabuf *res;
1285 : const u8 *pos;
1286 : struct eap_sim_attrs attr;
1287 : size_t len;
1288 :
1289 207 : wpa_hexdump_buf(MSG_DEBUG, "EAP-AKA: EAP data", reqData);
1290 207 : if (eap_get_config_identity(sm, &len) == NULL) {
1291 0 : wpa_printf(MSG_INFO, "EAP-AKA: Identity not configured");
1292 0 : eap_sm_request_identity(sm);
1293 0 : ret->ignore = TRUE;
1294 0 : return NULL;
1295 : }
1296 :
1297 207 : pos = eap_hdr_validate(EAP_VENDOR_IETF, data->eap_method, reqData,
1298 : &len);
1299 207 : if (pos == NULL || len < 1) {
1300 2 : ret->ignore = TRUE;
1301 2 : return NULL;
1302 : }
1303 205 : req = wpabuf_head(reqData);
1304 205 : id = req->identifier;
1305 205 : len = be_to_host16(req->length);
1306 :
1307 205 : ret->ignore = FALSE;
1308 205 : ret->methodState = METHOD_MAY_CONT;
1309 205 : ret->decision = DECISION_FAIL;
1310 205 : ret->allowNotifications = TRUE;
1311 :
1312 205 : subtype = *pos++;
1313 205 : wpa_printf(MSG_DEBUG, "EAP-AKA: Subtype=%d", subtype);
1314 205 : pos += 2; /* Reserved */
1315 :
1316 205 : if (eap_sim_parse_attr(pos, wpabuf_head_u8(reqData) + len, &attr,
1317 205 : data->eap_method == EAP_TYPE_AKA_PRIME ? 2 : 1,
1318 : 0)) {
1319 31 : res = eap_aka_client_error(data, id,
1320 : EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1321 31 : goto done;
1322 : }
1323 :
1324 174 : switch (subtype) {
1325 : case EAP_AKA_SUBTYPE_IDENTITY:
1326 62 : res = eap_aka_process_identity(sm, data, id, reqData, &attr);
1327 62 : break;
1328 : case EAP_AKA_SUBTYPE_CHALLENGE:
1329 82 : res = eap_aka_process_challenge(sm, data, id, reqData, &attr);
1330 82 : break;
1331 : case EAP_AKA_SUBTYPE_NOTIFICATION:
1332 12 : res = eap_aka_process_notification(sm, data, id, reqData,
1333 : &attr);
1334 12 : break;
1335 : case EAP_AKA_SUBTYPE_REAUTHENTICATION:
1336 16 : res = eap_aka_process_reauthentication(sm, data, id, reqData,
1337 : &attr);
1338 16 : break;
1339 : case EAP_AKA_SUBTYPE_CLIENT_ERROR:
1340 1 : wpa_printf(MSG_DEBUG, "EAP-AKA: subtype Client-Error");
1341 1 : res = eap_aka_client_error(data, id,
1342 : EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1343 1 : break;
1344 : default:
1345 1 : wpa_printf(MSG_DEBUG, "EAP-AKA: Unknown subtype=%d", subtype);
1346 1 : res = eap_aka_client_error(data, id,
1347 : EAP_AKA_UNABLE_TO_PROCESS_PACKET);
1348 1 : break;
1349 : }
1350 :
1351 : done:
1352 205 : if (data->state == FAILURE) {
1353 82 : ret->decision = DECISION_FAIL;
1354 82 : ret->methodState = METHOD_DONE;
1355 123 : } else if (data->state == SUCCESS) {
1356 37 : ret->decision = data->use_result_ind ?
1357 : DECISION_UNCOND_SUCC : DECISION_COND_SUCC;
1358 : /*
1359 : * It is possible for the server to reply with AKA
1360 : * Notification, so we must allow the method to continue and
1361 : * not only accept EAP-Success at this point.
1362 : */
1363 37 : ret->methodState = data->use_result_ind ?
1364 : METHOD_DONE : METHOD_MAY_CONT;
1365 86 : } else if (data->state == RESULT_SUCCESS)
1366 4 : ret->methodState = METHOD_CONT;
1367 :
1368 205 : if (ret->methodState == METHOD_DONE) {
1369 86 : ret->allowNotifications = FALSE;
1370 : }
1371 :
1372 205 : return res;
1373 : }
1374 :
1375 :
1376 48 : static Boolean eap_aka_has_reauth_data(struct eap_sm *sm, void *priv)
1377 : {
1378 48 : struct eap_aka_data *data = priv;
1379 48 : return data->pseudonym || data->reauth_id;
1380 : }
1381 :
1382 :
1383 22 : static void eap_aka_deinit_for_reauth(struct eap_sm *sm, void *priv)
1384 : {
1385 22 : struct eap_aka_data *data = priv;
1386 22 : eap_aka_clear_identities(sm, data, CLEAR_EAP_ID);
1387 22 : data->prev_id = -1;
1388 22 : wpabuf_free(data->id_msgs);
1389 22 : data->id_msgs = NULL;
1390 22 : data->use_result_ind = 0;
1391 22 : data->kdf_negotiation = 0;
1392 22 : eap_aka_clear_keys(data, 1);
1393 22 : }
1394 :
1395 :
1396 18 : static void * eap_aka_init_for_reauth(struct eap_sm *sm, void *priv)
1397 : {
1398 18 : struct eap_aka_data *data = priv;
1399 18 : data->num_id_req = 0;
1400 18 : data->num_notification = 0;
1401 18 : eap_aka_state(data, CONTINUE);
1402 18 : return priv;
1403 : }
1404 :
1405 :
1406 18 : static const u8 * eap_aka_get_identity(struct eap_sm *sm, void *priv,
1407 : size_t *len)
1408 : {
1409 18 : struct eap_aka_data *data = priv;
1410 :
1411 18 : if (data->reauth_id) {
1412 18 : *len = data->reauth_id_len;
1413 18 : return data->reauth_id;
1414 : }
1415 :
1416 0 : if (data->pseudonym) {
1417 0 : *len = data->pseudonym_len;
1418 0 : return data->pseudonym;
1419 : }
1420 :
1421 0 : return NULL;
1422 : }
1423 :
1424 :
1425 200 : static Boolean eap_aka_isKeyAvailable(struct eap_sm *sm, void *priv)
1426 : {
1427 200 : struct eap_aka_data *data = priv;
1428 200 : return data->state == SUCCESS;
1429 : }
1430 :
1431 :
1432 35 : static u8 * eap_aka_getKey(struct eap_sm *sm, void *priv, size_t *len)
1433 : {
1434 35 : struct eap_aka_data *data = priv;
1435 : u8 *key;
1436 :
1437 35 : if (data->state != SUCCESS)
1438 0 : return NULL;
1439 :
1440 35 : key = os_malloc(EAP_SIM_KEYING_DATA_LEN);
1441 35 : if (key == NULL)
1442 0 : return NULL;
1443 :
1444 35 : *len = EAP_SIM_KEYING_DATA_LEN;
1445 35 : os_memcpy(key, data->msk, EAP_SIM_KEYING_DATA_LEN);
1446 :
1447 35 : return key;
1448 : }
1449 :
1450 :
1451 34 : static u8 * eap_aka_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1452 : {
1453 34 : struct eap_aka_data *data = priv;
1454 : u8 *id;
1455 :
1456 34 : if (data->state != SUCCESS)
1457 0 : return NULL;
1458 :
1459 34 : *len = 1 + EAP_AKA_RAND_LEN + EAP_AKA_AUTN_LEN;
1460 34 : id = os_malloc(*len);
1461 34 : if (id == NULL)
1462 0 : return NULL;
1463 :
1464 34 : id[0] = data->eap_method;
1465 34 : os_memcpy(id + 1, data->rand, EAP_AKA_RAND_LEN);
1466 34 : os_memcpy(id + 1 + EAP_AKA_RAND_LEN, data->autn, EAP_AKA_AUTN_LEN);
1467 34 : wpa_hexdump(MSG_DEBUG, "EAP-AKA: Derived Session-Id", id, *len);
1468 :
1469 34 : return id;
1470 : }
1471 :
1472 :
1473 2 : static u8 * eap_aka_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1474 : {
1475 2 : struct eap_aka_data *data = priv;
1476 : u8 *key;
1477 :
1478 2 : if (data->state != SUCCESS)
1479 0 : return NULL;
1480 :
1481 2 : key = os_malloc(EAP_EMSK_LEN);
1482 2 : if (key == NULL)
1483 0 : return NULL;
1484 :
1485 2 : *len = EAP_EMSK_LEN;
1486 2 : os_memcpy(key, data->emsk, EAP_EMSK_LEN);
1487 :
1488 2 : return key;
1489 : }
1490 :
1491 :
1492 30 : int eap_peer_aka_register(void)
1493 : {
1494 : struct eap_method *eap;
1495 : int ret;
1496 :
1497 30 : eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1498 : EAP_VENDOR_IETF, EAP_TYPE_AKA, "AKA");
1499 30 : if (eap == NULL)
1500 0 : return -1;
1501 :
1502 30 : eap->init = eap_aka_init;
1503 30 : eap->deinit = eap_aka_deinit;
1504 30 : eap->process = eap_aka_process;
1505 30 : eap->isKeyAvailable = eap_aka_isKeyAvailable;
1506 30 : eap->getKey = eap_aka_getKey;
1507 30 : eap->getSessionId = eap_aka_get_session_id;
1508 30 : eap->has_reauth_data = eap_aka_has_reauth_data;
1509 30 : eap->deinit_for_reauth = eap_aka_deinit_for_reauth;
1510 30 : eap->init_for_reauth = eap_aka_init_for_reauth;
1511 30 : eap->get_identity = eap_aka_get_identity;
1512 30 : eap->get_emsk = eap_aka_get_emsk;
1513 :
1514 30 : ret = eap_peer_method_register(eap);
1515 30 : if (ret)
1516 0 : eap_peer_method_free(eap);
1517 30 : return ret;
1518 : }
1519 :
1520 :
1521 : #ifdef EAP_AKA_PRIME
1522 30 : int eap_peer_aka_prime_register(void)
1523 : {
1524 : struct eap_method *eap;
1525 : int ret;
1526 :
1527 30 : eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1528 : EAP_VENDOR_IETF, EAP_TYPE_AKA_PRIME,
1529 : "AKA'");
1530 30 : if (eap == NULL)
1531 0 : return -1;
1532 :
1533 30 : eap->init = eap_aka_prime_init;
1534 30 : eap->deinit = eap_aka_deinit;
1535 30 : eap->process = eap_aka_process;
1536 30 : eap->isKeyAvailable = eap_aka_isKeyAvailable;
1537 30 : eap->getKey = eap_aka_getKey;
1538 30 : eap->getSessionId = eap_aka_get_session_id;
1539 30 : eap->has_reauth_data = eap_aka_has_reauth_data;
1540 30 : eap->deinit_for_reauth = eap_aka_deinit_for_reauth;
1541 30 : eap->init_for_reauth = eap_aka_init_for_reauth;
1542 30 : eap->get_identity = eap_aka_get_identity;
1543 30 : eap->get_emsk = eap_aka_get_emsk;
1544 :
1545 30 : ret = eap_peer_method_register(eap);
1546 30 : if (ret)
1547 0 : eap_peer_method_free(eap);
1548 :
1549 30 : return ret;
1550 : }
1551 : #endif /* EAP_AKA_PRIME */
|
