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Expand PMF_FN_* macros.
[netbsd-mini2440.git] / dist / wpa / src / eap_peer / eap_sim.c
blobc89eddd44b7fe8e5299749eaa10053e34974ffe1
1 /*
2 * EAP peer method: EAP-SIM (RFC 4186)
3 * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
8 *
9 * Alternatively, this software may be distributed under the terms of BSD
10 * license.
11 *
12 * See README and COPYING for more details.
13 */
14
15 #include "includes.h"
16
17 #include "common.h"
18 #include "eap_peer/eap_i.h"
19 #include "eap_config.h"
20 #include "pcsc_funcs.h"
21 #include "eap_common/eap_sim_common.h"
22
23
24 struct eap_sim_data {
25 u8 *ver_list;
26 size_t ver_list_len;
27 int selected_version;
28 size_t min_num_chal, num_chal;
29
30 u8 kc[3][EAP_SIM_KC_LEN];
31 u8 sres[3][EAP_SIM_SRES_LEN];
32 u8 nonce_mt[EAP_SIM_NONCE_MT_LEN], nonce_s[EAP_SIM_NONCE_S_LEN];
33 u8 mk[EAP_SIM_MK_LEN];
34 u8 k_aut[EAP_SIM_K_AUT_LEN];
35 u8 k_encr[EAP_SIM_K_ENCR_LEN];
36 u8 msk[EAP_SIM_KEYING_DATA_LEN];
37 u8 emsk[EAP_EMSK_LEN];
38 u8 rand[3][GSM_RAND_LEN];
39
40 int num_id_req, num_notification;
41 u8 *pseudonym;
42 size_t pseudonym_len;
43 u8 *reauth_id;
44 size_t reauth_id_len;
45 int reauth;
46 unsigned int counter, counter_too_small;
47 u8 *last_eap_identity;
48 size_t last_eap_identity_len;
49 enum {
50 CONTINUE, RESULT_SUCCESS, RESULT_FAILURE, SUCCESS, FAILURE
51 } state;
52 int result_ind, use_result_ind;
53 };
54
55
56 #ifndef CONFIG_NO_STDOUT_DEBUG
57 static const char * eap_sim_state_txt(int state)
58 {
59 switch (state) {
60 case CONTINUE:
61 return "CONTINUE";
62 case RESULT_SUCCESS:
63 return "RESULT_SUCCESS";
64 case RESULT_FAILURE:
65 return "RESULT_FAILURE";
66 case SUCCESS:
67 return "SUCCESS";
68 case FAILURE:
69 return "FAILURE";
70 default:
71 return "?";
72 }
73 }
74 #endif /* CONFIG_NO_STDOUT_DEBUG */
75
76
77 static void eap_sim_state(struct eap_sim_data *data, int state)
78 {
79 wpa_printf(MSG_DEBUG, "EAP-SIM: %s -> %s",
80 eap_sim_state_txt(data->state),
81 eap_sim_state_txt(state));
82 data->state = state;
83 }
84
85
86 static void * eap_sim_init(struct eap_sm *sm)
87 {
88 struct eap_sim_data *data;
89 struct eap_peer_config *config = eap_get_config(sm);
90
91 data = os_zalloc(sizeof(*data));
92 if (data == NULL)
93 return NULL;
94
95 if (os_get_random(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) {
96 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data "
97 "for NONCE_MT");
98 os_free(data);
99 return NULL;
100 }
101
102 data->min_num_chal = 2;
103 if (config && config->phase1) {
104 char *pos = os_strstr(config->phase1, "sim_min_num_chal=");
105 if (pos) {
106 data->min_num_chal = atoi(pos + 17);
107 if (data->min_num_chal < 2 || data->min_num_chal > 3) {
108 wpa_printf(MSG_WARNING, "EAP-SIM: Invalid "
109 "sim_min_num_chal configuration "
110 "(%lu, expected 2 or 3)",
111 (unsigned long) data->min_num_chal);
112 os_free(data);
113 return NULL;
114 }
115 wpa_printf(MSG_DEBUG, "EAP-SIM: Set minimum number of "
116 "challenges to %lu",
117 (unsigned long) data->min_num_chal);
118 }
119
120 data->result_ind = os_strstr(config->phase1, "result_ind=1") !=
121 NULL;
122 }
123
124 eap_sim_state(data, CONTINUE);
125
126 return data;
127 }
128
129
130 static void eap_sim_deinit(struct eap_sm *sm, void *priv)
131 {
132 struct eap_sim_data *data = priv;
133 if (data) {
134 os_free(data->ver_list);
135 os_free(data->pseudonym);
136 os_free(data->reauth_id);
137 os_free(data->last_eap_identity);
138 os_free(data);
139 }
140 }
141
142
143 static int eap_sim_gsm_auth(struct eap_sm *sm, struct eap_sim_data *data)
144 {
145 wpa_printf(MSG_DEBUG, "EAP-SIM: GSM authentication algorithm");
146 #ifdef PCSC_FUNCS
147 if (scard_gsm_auth(sm->scard_ctx, data->rand[0],
148 data->sres[0], data->kc[0]) ||
149 scard_gsm_auth(sm->scard_ctx, data->rand[1],
150 data->sres[1], data->kc[1]) ||
151 (data->num_chal > 2 &&
152 scard_gsm_auth(sm->scard_ctx, data->rand[2],
153 data->sres[2], data->kc[2]))) {
154 wpa_printf(MSG_DEBUG, "EAP-SIM: GSM SIM authentication could "
155 "not be completed");
156 return -1;
157 }
158 #else /* PCSC_FUNCS */
159 /* These hardcoded Kc and SRES values are used for testing. RAND to
160 * KC/SREC mapping is very bogus as far as real authentication is
161 * concerned, but it is quite useful for cases where the AS is rotating
162 * the order of pre-configured values. */
163 {
164 size_t i;
165 for (i = 0; i < data->num_chal; i++) {
166 if (data->rand[i][0] == 0xaa) {
167 os_memcpy(data->kc[i],
168 "\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7",
169 EAP_SIM_KC_LEN);
170 os_memcpy(data->sres[i], "\xd1\xd2\xd3\xd4",
171 EAP_SIM_SRES_LEN);
172 } else if (data->rand[i][0] == 0xbb) {
173 os_memcpy(data->kc[i],
174 "\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7",
175 EAP_SIM_KC_LEN);
176 os_memcpy(data->sres[i], "\xe1\xe2\xe3\xe4",
177 EAP_SIM_SRES_LEN);
178 } else {
179 os_memcpy(data->kc[i],
180 "\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7",
181 EAP_SIM_KC_LEN);
182 os_memcpy(data->sres[i], "\xf1\xf2\xf3\xf4",
183 EAP_SIM_SRES_LEN);
184 }
185 }
186 }
187 #endif /* PCSC_FUNCS */
188 return 0;
189 }
190
191
192 static int eap_sim_supported_ver(int version)
193 {
194 return version == EAP_SIM_VERSION;
195 }
196
197
198 #define CLEAR_PSEUDONYM 0x01
199 #define CLEAR_REAUTH_ID 0x02
200 #define CLEAR_EAP_ID 0x04
201
202 static void eap_sim_clear_identities(struct eap_sim_data *data, int id)
203 {
204 wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old%s%s%s",
205 id & CLEAR_PSEUDONYM ? " pseudonym" : "",
206 id & CLEAR_REAUTH_ID ? " reauth_id" : "",
207 id & CLEAR_EAP_ID ? " eap_id" : "");
208 if (id & CLEAR_PSEUDONYM) {
209 os_free(data->pseudonym);
210 data->pseudonym = NULL;
211 data->pseudonym_len = 0;
212 }
213 if (id & CLEAR_REAUTH_ID) {
214 os_free(data->reauth_id);
215 data->reauth_id = NULL;
216 data->reauth_id_len = 0;
217 }
218 if (id & CLEAR_EAP_ID) {
219 os_free(data->last_eap_identity);
220 data->last_eap_identity = NULL;
221 data->last_eap_identity_len = 0;
222 }
223 }
224
225
226 static int eap_sim_learn_ids(struct eap_sim_data *data,
227 struct eap_sim_attrs *attr)
228 {
229 if (attr->next_pseudonym) {
230 os_free(data->pseudonym);
231 data->pseudonym = os_malloc(attr->next_pseudonym_len);
232 if (data->pseudonym == NULL) {
233 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No memory for "
234 "next pseudonym");
235 return -1;
236 }
237 os_memcpy(data->pseudonym, attr->next_pseudonym,
238 attr->next_pseudonym_len);
239 data->pseudonym_len = attr->next_pseudonym_len;
240 wpa_hexdump_ascii(MSG_DEBUG,
241 "EAP-SIM: (encr) AT_NEXT_PSEUDONYM",
242 data->pseudonym,
243 data->pseudonym_len);
244 }
245
246 if (attr->next_reauth_id) {
247 os_free(data->reauth_id);
248 data->reauth_id = os_malloc(attr->next_reauth_id_len);
249 if (data->reauth_id == NULL) {
250 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No memory for "
251 "next reauth_id");
252 return -1;
253 }
254 os_memcpy(data->reauth_id, attr->next_reauth_id,
255 attr->next_reauth_id_len);
256 data->reauth_id_len = attr->next_reauth_id_len;
257 wpa_hexdump_ascii(MSG_DEBUG,
258 "EAP-SIM: (encr) AT_NEXT_REAUTH_ID",
259 data->reauth_id,
260 data->reauth_id_len);
261 }
262
263 return 0;
264 }
265
266
267 static struct wpabuf * eap_sim_client_error(struct eap_sim_data *data, u8 id,
268 int err)
269 {
270 struct eap_sim_msg *msg;
271
272 eap_sim_state(data, FAILURE);
273 data->num_id_req = 0;
274 data->num_notification = 0;
275
276 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
277 EAP_SIM_SUBTYPE_CLIENT_ERROR);
278 eap_sim_msg_add(msg, EAP_SIM_AT_CLIENT_ERROR_CODE, err, NULL, 0);
279 return eap_sim_msg_finish(msg, NULL, NULL, 0);
280 }
281
282
283 static struct wpabuf * eap_sim_response_start(struct eap_sm *sm,
284 struct eap_sim_data *data, u8 id,
285 enum eap_sim_id_req id_req)
286 {
287 const u8 *identity = NULL;
288 size_t identity_len = 0;
289 struct eap_sim_msg *msg;
290
291 data->reauth = 0;
292 if (id_req == ANY_ID && data->reauth_id) {
293 identity = data->reauth_id;
294 identity_len = data->reauth_id_len;
295 data->reauth = 1;
296 } else if ((id_req == ANY_ID || id_req == FULLAUTH_ID) &&
297 data->pseudonym) {
298 identity = data->pseudonym;
299 identity_len = data->pseudonym_len;
300 eap_sim_clear_identities(data, CLEAR_REAUTH_ID);
301 } else if (id_req != NO_ID_REQ) {
302 identity = eap_get_config_identity(sm, &identity_len);
303 if (identity) {
304 eap_sim_clear_identities(data, CLEAR_PSEUDONYM |
305 CLEAR_REAUTH_ID);
306 }
307 }
308 if (id_req != NO_ID_REQ)
309 eap_sim_clear_identities(data, CLEAR_EAP_ID);
310
311 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Start (id=%d)", id);
312 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id,
313 EAP_TYPE_SIM, EAP_SIM_SUBTYPE_START);
314 if (!data->reauth) {
315 wpa_hexdump(MSG_DEBUG, " AT_NONCE_MT",
316 data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
317 eap_sim_msg_add(msg, EAP_SIM_AT_NONCE_MT, 0,
318 data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
319 wpa_printf(MSG_DEBUG, " AT_SELECTED_VERSION %d",
320 data->selected_version);
321 eap_sim_msg_add(msg, EAP_SIM_AT_SELECTED_VERSION,
322 data->selected_version, NULL, 0);
323 }
324
325 if (identity) {
326 wpa_hexdump_ascii(MSG_DEBUG, " AT_IDENTITY",
327 identity, identity_len);
328 eap_sim_msg_add(msg, EAP_SIM_AT_IDENTITY, identity_len,
329 identity, identity_len);
330 }
331
332 return eap_sim_msg_finish(msg, NULL, NULL, 0);
333 }
334
335
336 static struct wpabuf * eap_sim_response_challenge(struct eap_sim_data *data,
337 u8 id)
338 {
339 struct eap_sim_msg *msg;
340
341 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Challenge (id=%d)", id);
342 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
343 EAP_SIM_SUBTYPE_CHALLENGE);
344 if (data->use_result_ind) {
345 wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
346 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
347 }
348 wpa_printf(MSG_DEBUG, " AT_MAC");
349 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
350 return eap_sim_msg_finish(msg, data->k_aut, (u8 *) data->sres,
351 data->num_chal * EAP_SIM_SRES_LEN);
352 }
353
354
355 static struct wpabuf * eap_sim_response_reauth(struct eap_sim_data *data,
356 u8 id, int counter_too_small)
357 {
358 struct eap_sim_msg *msg;
359 unsigned int counter;
360
361 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Reauthentication (id=%d)",
362 id);
363 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
364 EAP_SIM_SUBTYPE_REAUTHENTICATION);
365 wpa_printf(MSG_DEBUG, " AT_IV");
366 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
367 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA);
368
369 if (counter_too_small) {
370 wpa_printf(MSG_DEBUG, " *AT_COUNTER_TOO_SMALL");
371 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER_TOO_SMALL, 0, NULL, 0);
372 counter = data->counter_too_small;
373 } else
374 counter = data->counter;
375
376 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", counter);
377 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0);
378
379 if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) {
380 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt "
381 "AT_ENCR_DATA");
382 eap_sim_msg_free(msg);
383 return NULL;
384 }
385 if (data->use_result_ind) {
386 wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
387 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
388 }
389 wpa_printf(MSG_DEBUG, " AT_MAC");
390 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
391 return eap_sim_msg_finish(msg, data->k_aut, data->nonce_s,
392 EAP_SIM_NONCE_S_LEN);
393 }
394
395
396 static struct wpabuf * eap_sim_response_notification(struct eap_sim_data *data,
397 u8 id, u16 notification)
398 {
399 struct eap_sim_msg *msg;
400 u8 *k_aut = (notification & 0x4000) == 0 ? data->k_aut : NULL;
401
402 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Notification (id=%d)", id);
403 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id,
404 EAP_TYPE_SIM, EAP_SIM_SUBTYPE_NOTIFICATION);
405 wpa_printf(MSG_DEBUG, " AT_NOTIFICATION");
406 eap_sim_msg_add(msg, EAP_SIM_AT_NOTIFICATION, notification, NULL, 0);
407 if (k_aut && data->reauth) {
408 wpa_printf(MSG_DEBUG, " AT_IV");
409 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
410 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV,
411 EAP_SIM_AT_ENCR_DATA);
412 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", data->counter);
413 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter,
414 NULL, 0);
415 if (eap_sim_msg_add_encr_end(msg, data->k_encr,
416 EAP_SIM_AT_PADDING)) {
417 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt "
418 "AT_ENCR_DATA");
419 eap_sim_msg_free(msg);
420 return NULL;
421 }
422 }
423 if (k_aut) {
424 wpa_printf(MSG_DEBUG, " AT_MAC");
425 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
426 }
427 return eap_sim_msg_finish(msg, k_aut, (u8 *) "", 0);
428 }
429
430
431 static struct wpabuf * eap_sim_process_start(struct eap_sm *sm,
432 struct eap_sim_data *data, u8 id,
433 struct eap_sim_attrs *attr)
434 {
435 int selected_version = -1, id_error;
436 size_t i;
437 u8 *pos;
438
439 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Start");
440 if (attr->version_list == NULL) {
441 wpa_printf(MSG_INFO, "EAP-SIM: No AT_VERSION_LIST in "
442 "SIM/Start");
443 return eap_sim_client_error(data, id,
444 EAP_SIM_UNSUPPORTED_VERSION);
445 }
446
447 os_free(data->ver_list);
448 data->ver_list = os_malloc(attr->version_list_len);
449 if (data->ver_list == NULL) {
450 wpa_printf(MSG_DEBUG, "EAP-SIM: Failed to allocate "
451 "memory for version list");
452 return eap_sim_client_error(data, id,
453 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
454 }
455 os_memcpy(data->ver_list, attr->version_list, attr->version_list_len);
456 data->ver_list_len = attr->version_list_len;
457 pos = data->ver_list;
458 for (i = 0; i < data->ver_list_len / 2; i++) {
459 int ver = pos[0] * 256 + pos[1];
460 pos += 2;
461 if (eap_sim_supported_ver(ver)) {
462 selected_version = ver;
463 break;
464 }
465 }
466 if (selected_version < 0) {
467 wpa_printf(MSG_INFO, "EAP-SIM: Could not find a supported "
468 "version");
469 return eap_sim_client_error(data, id,
470 EAP_SIM_UNSUPPORTED_VERSION);
471 }
472 wpa_printf(MSG_DEBUG, "EAP-SIM: Selected Version %d",
473 selected_version);
474 data->selected_version = selected_version;
475
476 id_error = 0;
477 switch (attr->id_req) {
478 case NO_ID_REQ:
479 break;
480 case ANY_ID:
481 if (data->num_id_req > 0)
482 id_error++;
483 data->num_id_req++;
484 break;
485 case FULLAUTH_ID:
486 if (data->num_id_req > 1)
487 id_error++;
488 data->num_id_req++;
489 break;
490 case PERMANENT_ID:
491 if (data->num_id_req > 2)
492 id_error++;
493 data->num_id_req++;
494 break;
495 }
496 if (id_error) {
497 wpa_printf(MSG_INFO, "EAP-SIM: Too many ID requests "
498 "used within one authentication");
499 return eap_sim_client_error(data, id,
500 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
501 }
502
503 return eap_sim_response_start(sm, data, id, attr->id_req);
504 }
505
506
507 static struct wpabuf * eap_sim_process_challenge(struct eap_sm *sm,
508 struct eap_sim_data *data,
509 u8 id,
510 const struct wpabuf *reqData,
511 struct eap_sim_attrs *attr)
512 {
513 const u8 *identity;
514 size_t identity_len;
515 struct eap_sim_attrs eattr;
516
517 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Challenge");
518 data->reauth = 0;
519 if (!attr->mac || !attr->rand) {
520 wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message "
521 "did not include%s%s",
522 !attr->mac ? " AT_MAC" : "",
523 !attr->rand ? " AT_RAND" : "");
524 return eap_sim_client_error(data, id,
525 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
526 }
527
528 wpa_printf(MSG_DEBUG, "EAP-SIM: %lu challenges",
529 (unsigned long) attr->num_chal);
530 if (attr->num_chal < data->min_num_chal) {
531 wpa_printf(MSG_INFO, "EAP-SIM: Insufficient number of "
532 "challenges (%lu)", (unsigned long) attr->num_chal);
533 return eap_sim_client_error(data, id,
534 EAP_SIM_INSUFFICIENT_NUM_OF_CHAL);
535 }
536 if (attr->num_chal > 3) {
537 wpa_printf(MSG_INFO, "EAP-SIM: Too many challenges "
538 "(%lu)", (unsigned long) attr->num_chal);
539 return eap_sim_client_error(data, id,
540 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
541 }
542
543 /* Verify that RANDs are different */
544 if (os_memcmp(attr->rand, attr->rand + GSM_RAND_LEN,
545 GSM_RAND_LEN) == 0 ||
546 (attr->num_chal > 2 &&
547 (os_memcmp(attr->rand, attr->rand + 2 * GSM_RAND_LEN,
548 GSM_RAND_LEN) == 0 ||
549 os_memcmp(attr->rand + GSM_RAND_LEN,
550 attr->rand + 2 * GSM_RAND_LEN,
551 GSM_RAND_LEN) == 0))) {
552 wpa_printf(MSG_INFO, "EAP-SIM: Same RAND used multiple times");
553 return eap_sim_client_error(data, id,
554 EAP_SIM_RAND_NOT_FRESH);
555 }
556
557 os_memcpy(data->rand, attr->rand, attr->num_chal * GSM_RAND_LEN);
558 data->num_chal = attr->num_chal;
559
560 if (eap_sim_gsm_auth(sm, data)) {
561 wpa_printf(MSG_WARNING, "EAP-SIM: GSM authentication failed");
562 return eap_sim_client_error(data, id,
563 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
564 }
565 if (data->last_eap_identity) {
566 identity = data->last_eap_identity;
567 identity_len = data->last_eap_identity_len;
568 } else if (data->pseudonym) {
569 identity = data->pseudonym;
570 identity_len = data->pseudonym_len;
571 } else
572 identity = eap_get_config_identity(sm, &identity_len);
573 wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM: Selected identity for MK "
574 "derivation", identity, identity_len);
575 eap_sim_derive_mk(identity, identity_len, data->nonce_mt,
576 data->selected_version, data->ver_list,
577 data->ver_list_len, data->num_chal,
578 (const u8 *) data->kc, data->mk);
579 eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut, data->msk,
580 data->emsk);
581 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, data->nonce_mt,
582 EAP_SIM_NONCE_MT_LEN)) {
583 wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message "
584 "used invalid AT_MAC");
585 return eap_sim_client_error(data, id,
586 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
587 }
588
589 /* Old reauthentication and pseudonym identities must not be used
590 * anymore. In other words, if no new identities are received, full
591 * authentication will be used on next reauthentication. */
592 eap_sim_clear_identities(data, CLEAR_PSEUDONYM | CLEAR_REAUTH_ID |
593 CLEAR_EAP_ID);
594
595 if (attr->encr_data) {
596 u8 *decrypted;
597 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
598 attr->encr_data_len, attr->iv,
599 &eattr, 0);
600 if (decrypted == NULL) {
601 return eap_sim_client_error(
602 data, id, EAP_SIM_UNABLE_TO_PROCESS_PACKET);
603 }
604 eap_sim_learn_ids(data, &eattr);
605 os_free(decrypted);
606 }
607
608 if (data->result_ind && attr->result_ind)
609 data->use_result_ind = 1;
610
611 if (data->state != FAILURE && data->state != RESULT_FAILURE) {
612 eap_sim_state(data, data->use_result_ind ?
613 RESULT_SUCCESS : SUCCESS);
614 }
615
616 data->num_id_req = 0;
617 data->num_notification = 0;
618 /* RFC 4186 specifies that counter is initialized to one after
619 * fullauth, but initializing it to zero makes it easier to implement
620 * reauth verification. */
621 data->counter = 0;
622 return eap_sim_response_challenge(data, id);
623 }
624
625
626 static int eap_sim_process_notification_reauth(struct eap_sim_data *data,
627 struct eap_sim_attrs *attr)
628 {
629 struct eap_sim_attrs eattr;
630 u8 *decrypted;
631
632 if (attr->encr_data == NULL || attr->iv == NULL) {
633 wpa_printf(MSG_WARNING, "EAP-SIM: Notification message after "
634 "reauth did not include encrypted data");
635 return -1;
636 }
637
638 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
639 attr->encr_data_len, attr->iv, &eattr,
640 0);
641 if (decrypted == NULL) {
642 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted "
643 "data from notification message");
644 return -1;
645 }
646
647 if (eattr.counter < 0 || (size_t) eattr.counter != data->counter) {
648 wpa_printf(MSG_WARNING, "EAP-SIM: Counter in notification "
649 "message does not match with counter in reauth "
650 "message");
651 os_free(decrypted);
652 return -1;
653 }
654
655 os_free(decrypted);
656 return 0;
657 }
658
659
660 static int eap_sim_process_notification_auth(struct eap_sim_data *data,
661 const struct wpabuf *reqData,
662 struct eap_sim_attrs *attr)
663 {
664 if (attr->mac == NULL) {
665 wpa_printf(MSG_INFO, "EAP-SIM: no AT_MAC in after_auth "
666 "Notification message");
667 return -1;
668 }
669
670 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
671 {
672 wpa_printf(MSG_WARNING, "EAP-SIM: Notification message "
673 "used invalid AT_MAC");
674 return -1;
675 }
676
677 if (data->reauth &&
678 eap_sim_process_notification_reauth(data, attr)) {
679 wpa_printf(MSG_WARNING, "EAP-SIM: Invalid notification "
680 "message after reauth");
681 return -1;
682 }
683
684 return 0;
685 }
686
687
688 static struct wpabuf * eap_sim_process_notification(
689 struct eap_sm *sm, struct eap_sim_data *data, u8 id,
690 const struct wpabuf *reqData, struct eap_sim_attrs *attr)
691 {
692 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Notification");
693 if (data->num_notification > 0) {
694 wpa_printf(MSG_INFO, "EAP-SIM: too many notification "
695 "rounds (only one allowed)");
696 return eap_sim_client_error(data, id,
697 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
698 }
699 data->num_notification++;
700 if (attr->notification == -1) {
701 wpa_printf(MSG_INFO, "EAP-SIM: no AT_NOTIFICATION in "
702 "Notification message");
703 return eap_sim_client_error(data, id,
704 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
705 }
706
707 if ((attr->notification & 0x4000) == 0 &&
708 eap_sim_process_notification_auth(data, reqData, attr)) {
709 return eap_sim_client_error(data, id,
710 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
711 }
712
713 eap_sim_report_notification(sm->msg_ctx, attr->notification, 0);
714 if (attr->notification >= 0 && attr->notification < 32768) {
715 eap_sim_state(data, FAILURE);
716 } else if (attr->notification == EAP_SIM_SUCCESS &&
717 data->state == RESULT_SUCCESS)
718 eap_sim_state(data, SUCCESS);
719 return eap_sim_response_notification(data, id, attr->notification);
720 }
721
722
723 static struct wpabuf * eap_sim_process_reauthentication(
724 struct eap_sm *sm, struct eap_sim_data *data, u8 id,
725 const struct wpabuf *reqData, struct eap_sim_attrs *attr)
726 {
727 struct eap_sim_attrs eattr;
728 u8 *decrypted;
729
730 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Reauthentication");
731
732 if (data->reauth_id == NULL) {
733 wpa_printf(MSG_WARNING, "EAP-SIM: Server is trying "
734 "reauthentication, but no reauth_id available");
735 return eap_sim_client_error(data, id,
736 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
737 }
738
739 data->reauth = 1;
740 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
741 {
742 wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication "
743 "did not have valid AT_MAC");
744 return eap_sim_client_error(data, id,
745 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
746 }
747
748 if (attr->encr_data == NULL || attr->iv == NULL) {
749 wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication "
750 "message did not include encrypted data");
751 return eap_sim_client_error(data, id,
752 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
753 }
754
755 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
756 attr->encr_data_len, attr->iv, &eattr,
757 0);
758 if (decrypted == NULL) {
759 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted "
760 "data from reauthentication message");
761 return eap_sim_client_error(data, id,
762 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
763 }
764
765 if (eattr.nonce_s == NULL || eattr.counter < 0) {
766 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No%s%s in reauth packet",
767 !eattr.nonce_s ? " AT_NONCE_S" : "",
768 eattr.counter < 0 ? " AT_COUNTER" : "");
769 os_free(decrypted);
770 return eap_sim_client_error(data, id,
771 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
772 }
773
774 if (eattr.counter < 0 || (size_t) eattr.counter <= data->counter) {
775 wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid counter "
776 "(%d <= %d)", eattr.counter, data->counter);
777 data->counter_too_small = eattr.counter;
778 /* Reply using Re-auth w/ AT_COUNTER_TOO_SMALL. The current
779 * reauth_id must not be used to start a new reauthentication.
780 * However, since it was used in the last EAP-Response-Identity
781 * packet, it has to saved for the following fullauth to be
782 * used in MK derivation. */
783 os_free(data->last_eap_identity);
784 data->last_eap_identity = data->reauth_id;
785 data->last_eap_identity_len = data->reauth_id_len;
786 data->reauth_id = NULL;
787 data->reauth_id_len = 0;
788 os_free(decrypted);
789 return eap_sim_response_reauth(data, id, 1);
790 }
791 data->counter = eattr.counter;
792
793 os_memcpy(data->nonce_s, eattr.nonce_s, EAP_SIM_NONCE_S_LEN);
794 wpa_hexdump(MSG_DEBUG, "EAP-SIM: (encr) AT_NONCE_S",
795 data->nonce_s, EAP_SIM_NONCE_S_LEN);
796
797 eap_sim_derive_keys_reauth(data->counter,
798 data->reauth_id, data->reauth_id_len,
799 data->nonce_s, data->mk, data->msk,
800 data->emsk);
801 eap_sim_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
802 eap_sim_learn_ids(data, &eattr);
803
804 if (data->result_ind && attr->result_ind)
805 data->use_result_ind = 1;
806
807 if (data->state != FAILURE && data->state != RESULT_FAILURE) {
808 eap_sim_state(data, data->use_result_ind ?
809 RESULT_SUCCESS : SUCCESS);
810 }
811
812 data->num_id_req = 0;
813 data->num_notification = 0;
814 if (data->counter > EAP_SIM_MAX_FAST_REAUTHS) {
815 wpa_printf(MSG_DEBUG, "EAP-SIM: Maximum number of "
816 "fast reauths performed - force fullauth");
817 eap_sim_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
818 }
819 os_free(decrypted);
820 return eap_sim_response_reauth(data, id, 0);
821 }
822
823
824 static struct wpabuf * eap_sim_process(struct eap_sm *sm, void *priv,
825 struct eap_method_ret *ret,
826 const struct wpabuf *reqData)
827 {
828 struct eap_sim_data *data = priv;
829 const struct eap_hdr *req;
830 u8 subtype, id;
831 struct wpabuf *res;
832 const u8 *pos;
833 struct eap_sim_attrs attr;
834 size_t len;
835
836 wpa_hexdump_buf(MSG_DEBUG, "EAP-SIM: EAP data", reqData);
837 if (eap_get_config_identity(sm, &len) == NULL) {
838 wpa_printf(MSG_INFO, "EAP-SIM: Identity not configured");
839 eap_sm_request_identity(sm);
840 ret->ignore = TRUE;
841 return NULL;
842 }
843
844 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_SIM, reqData, &len);
845 if (pos == NULL || len < 1) {
846 ret->ignore = TRUE;
847 return NULL;
848 }
849 req = wpabuf_head(reqData);
850 id = req->identifier;
851 len = be_to_host16(req->length);
852
853 ret->ignore = FALSE;
854 ret->methodState = METHOD_MAY_CONT;
855 ret->decision = DECISION_FAIL;
856 ret->allowNotifications = TRUE;
857
858 subtype = *pos++;
859 wpa_printf(MSG_DEBUG, "EAP-SIM: Subtype=%d", subtype);
860 pos += 2; /* Reserved */
861
862 if (eap_sim_parse_attr(pos, wpabuf_head_u8(reqData) + len, &attr, 0,
863 0)) {
864 res = eap_sim_client_error(data, id,
865 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
866 goto done;
867 }
868
869 switch (subtype) {
870 case EAP_SIM_SUBTYPE_START:
871 res = eap_sim_process_start(sm, data, id, &attr);
872 break;
873 case EAP_SIM_SUBTYPE_CHALLENGE:
874 res = eap_sim_process_challenge(sm, data, id, reqData, &attr);
875 break;
876 case EAP_SIM_SUBTYPE_NOTIFICATION:
877 res = eap_sim_process_notification(sm, data, id, reqData,
878 &attr);
879 break;
880 case EAP_SIM_SUBTYPE_REAUTHENTICATION:
881 res = eap_sim_process_reauthentication(sm, data, id, reqData,
882 &attr);
883 break;
884 case EAP_SIM_SUBTYPE_CLIENT_ERROR:
885 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Client-Error");
886 res = eap_sim_client_error(data, id,
887 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
888 break;
889 default:
890 wpa_printf(MSG_DEBUG, "EAP-SIM: Unknown subtype=%d", subtype);
891 res = eap_sim_client_error(data, id,
892 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
893 break;
894 }
895
896 done:
897 if (data->state == FAILURE) {
898 ret->decision = DECISION_FAIL;
899 ret->methodState = METHOD_DONE;
900 } else if (data->state == SUCCESS) {
901 ret->decision = data->use_result_ind ?
902 DECISION_UNCOND_SUCC : DECISION_COND_SUCC;
903 ret->methodState = data->use_result_ind ?
904 METHOD_DONE : METHOD_MAY_CONT;
905 } else if (data->state == RESULT_FAILURE)
906 ret->methodState = METHOD_CONT;
907 else if (data->state == RESULT_SUCCESS)
908 ret->methodState = METHOD_CONT;
909
910 if (ret->methodState == METHOD_DONE) {
911 ret->allowNotifications = FALSE;
912 }
913
914 return res;
915 }
916
917
918 static Boolean eap_sim_has_reauth_data(struct eap_sm *sm, void *priv)
919 {
920 struct eap_sim_data *data = priv;
921 return data->pseudonym || data->reauth_id;
922 }
923
924
925 static void eap_sim_deinit_for_reauth(struct eap_sm *sm, void *priv)
926 {
927 struct eap_sim_data *data = priv;
928 eap_sim_clear_identities(data, CLEAR_EAP_ID);
929 data->use_result_ind = 0;
930 }
931
932
933 static void * eap_sim_init_for_reauth(struct eap_sm *sm, void *priv)
934 {
935 struct eap_sim_data *data = priv;
936 if (os_get_random(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) {
937 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data "
938 "for NONCE_MT");
939 os_free(data);
940 return NULL;
941 }
942 data->num_id_req = 0;
943 data->num_notification = 0;
944 eap_sim_state(data, CONTINUE);
945 return priv;
946 }
947
948
949 static const u8 * eap_sim_get_identity(struct eap_sm *sm, void *priv,
950 size_t *len)
951 {
952 struct eap_sim_data *data = priv;
953
954 if (data->reauth_id) {
955 *len = data->reauth_id_len;
956 return data->reauth_id;
957 }
958
959 if (data->pseudonym) {
960 *len = data->pseudonym_len;
961 return data->pseudonym;
962 }
963
964 return NULL;
965 }
966
967
968 static Boolean eap_sim_isKeyAvailable(struct eap_sm *sm, void *priv)
969 {
970 struct eap_sim_data *data = priv;
971 return data->state == SUCCESS;
972 }
973
974
975 static u8 * eap_sim_getKey(struct eap_sm *sm, void *priv, size_t *len)
976 {
977 struct eap_sim_data *data = priv;
978 u8 *key;
979
980 if (data->state != SUCCESS)
981 return NULL;
982
983 key = os_malloc(EAP_SIM_KEYING_DATA_LEN);
984 if (key == NULL)
985 return NULL;
986
987 *len = EAP_SIM_KEYING_DATA_LEN;
988 os_memcpy(key, data->msk, EAP_SIM_KEYING_DATA_LEN);
989
990 return key;
991 }
992
993
994 static u8 * eap_sim_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
995 {
996 struct eap_sim_data *data = priv;
997 u8 *key;
998
999 if (data->state != SUCCESS)
1000 return NULL;
1001
1002 key = os_malloc(EAP_EMSK_LEN);
1003 if (key == NULL)
1004 return NULL;
1005
1006 *len = EAP_EMSK_LEN;
1007 os_memcpy(key, data->emsk, EAP_EMSK_LEN);
1008
1009 return key;
1010 }
1011
1012
1013 int eap_peer_sim_register(void)
1014 {
1015 struct eap_method *eap;
1016 int ret;
1017
1018 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1019 EAP_VENDOR_IETF, EAP_TYPE_SIM, "SIM");
1020 if (eap == NULL)
1021 return -1;
1022
1023 eap->init = eap_sim_init;
1024 eap->deinit = eap_sim_deinit;
1025 eap->process = eap_sim_process;
1026 eap->isKeyAvailable = eap_sim_isKeyAvailable;
1027 eap->getKey = eap_sim_getKey;
1028 eap->has_reauth_data = eap_sim_has_reauth_data;
1029 eap->deinit_for_reauth = eap_sim_deinit_for_reauth;
1030 eap->init_for_reauth = eap_sim_init_for_reauth;
1031 eap->get_identity = eap_sim_get_identity;
1032 eap->get_emsk = eap_sim_get_emsk;
1033
1034 ret = eap_peer_method_register(eap);
1035 if (ret)
1036 eap_peer_method_free(eap);
1037 return ret;
1038 }
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