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Merge commit 'crater/master'
[dragonfly.git] / contrib / wpa_supplicant-0.5.8 / eap_sim.c
blob545f0ae31d664b7b73003a0cf1fefa9225b1183d
1 /*
2 * EAP peer method: EAP-SIM (RFC 4186)
3 * Copyright (c) 2004-2006, 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_i.h"
19 #include "config_ssid.h"
20 #include "crypto.h"
21 #include "pcsc_funcs.h"
22 #include "eap_sim_common.h"
23
24
25 struct eap_sim_data {
26 u8 *ver_list;
27 size_t ver_list_len;
28 int selected_version;
29 size_t min_num_chal, num_chal;
30
31 u8 kc[3][EAP_SIM_KC_LEN];
32 u8 sres[3][EAP_SIM_SRES_LEN];
33 u8 nonce_mt[EAP_SIM_NONCE_MT_LEN], nonce_s[EAP_SIM_NONCE_S_LEN];
34 u8 mk[EAP_SIM_MK_LEN];
35 u8 k_aut[EAP_SIM_K_AUT_LEN];
36 u8 k_encr[EAP_SIM_K_ENCR_LEN];
37 u8 msk[EAP_SIM_KEYING_DATA_LEN];
38 u8 emsk[EAP_EMSK_LEN];
39 u8 rand[3][GSM_RAND_LEN];
40
41 int num_id_req, num_notification;
42 u8 *pseudonym;
43 size_t pseudonym_len;
44 u8 *reauth_id;
45 size_t reauth_id_len;
46 int reauth;
47 unsigned int counter, counter_too_small;
48 u8 *last_eap_identity;
49 size_t last_eap_identity_len;
50 enum { CONTINUE, SUCCESS, FAILURE } state;
51 };
52
53
54 static void * eap_sim_init(struct eap_sm *sm)
55 {
56 struct eap_sim_data *data;
57 struct wpa_ssid *config = eap_get_config(sm);
58
59 data = os_zalloc(sizeof(*data));
60 if (data == NULL)
61 return NULL;
62
63 if (hostapd_get_rand(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) {
64 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data "
65 "for NONCE_MT");
66 os_free(data);
67 return NULL;
68 }
69
70 data->min_num_chal = 2;
71 if (config && config->phase1) {
72 char *pos = os_strstr(config->phase1, "sim_min_num_chal=");
73 if (pos) {
74 data->min_num_chal = atoi(pos + 17);
75 if (data->min_num_chal < 2 || data->min_num_chal > 3) {
76 wpa_printf(MSG_WARNING, "EAP-SIM: Invalid "
77 "sim_min_num_chal configuration "
78 "(%lu, expected 2 or 3)",
79 (unsigned long) data->min_num_chal);
80 os_free(data);
81 return NULL;
82 }
83 wpa_printf(MSG_DEBUG, "EAP-SIM: Set minimum number of "
84 "challenges to %lu",
85 (unsigned long) data->min_num_chal);
86 }
87 }
88
89 data->state = CONTINUE;
90
91 return data;
92 }
93
94
95 static void eap_sim_deinit(struct eap_sm *sm, void *priv)
96 {
97 struct eap_sim_data *data = priv;
98 if (data) {
99 os_free(data->ver_list);
100 os_free(data->pseudonym);
101 os_free(data->reauth_id);
102 os_free(data->last_eap_identity);
103 os_free(data);
104 }
105 }
106
107
108 static int eap_sim_gsm_auth(struct eap_sm *sm, struct eap_sim_data *data)
109 {
110 wpa_printf(MSG_DEBUG, "EAP-SIM: GSM authentication algorithm");
111 #ifdef PCSC_FUNCS
112 if (scard_gsm_auth(sm->scard_ctx, data->rand[0],
113 data->sres[0], data->kc[0]) ||
114 scard_gsm_auth(sm->scard_ctx, data->rand[1],
115 data->sres[1], data->kc[1]) ||
116 (data->num_chal > 2 &&
117 scard_gsm_auth(sm->scard_ctx, data->rand[2],
118 data->sres[2], data->kc[2]))) {
119 wpa_printf(MSG_DEBUG, "EAP-SIM: GSM SIM authentication could "
120 "not be completed");
121 return -1;
122 }
123 #else /* PCSC_FUNCS */
124 /* These hardcoded Kc and SRES values are used for testing. RAND to
125 * KC/SREC mapping is very bogus as far as real authentication is
126 * concerned, but it is quite useful for cases where the AS is rotating
127 * the order of pre-configured values. */
128 {
129 size_t i;
130 for (i = 0; i < data->num_chal; i++) {
131 if (data->rand[i][0] == 0xaa) {
132 os_memcpy(data->kc[i],
133 "\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7",
134 EAP_SIM_KC_LEN);
135 os_memcpy(data->sres[i], "\xd1\xd2\xd3\xd4",
136 EAP_SIM_SRES_LEN);
137 } else if (data->rand[i][0] == 0xbb) {
138 os_memcpy(data->kc[i],
139 "\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7",
140 EAP_SIM_KC_LEN);
141 os_memcpy(data->sres[i], "\xe1\xe2\xe3\xe4",
142 EAP_SIM_SRES_LEN);
143 } else {
144 os_memcpy(data->kc[i],
145 "\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7",
146 EAP_SIM_KC_LEN);
147 os_memcpy(data->sres[i], "\xf1\xf2\xf3\xf4",
148 EAP_SIM_SRES_LEN);
149 }
150 }
151 }
152 #endif /* PCSC_FUNCS */
153 return 0;
154 }
155
156
157 static int eap_sim_supported_ver(int version)
158 {
159 return version == EAP_SIM_VERSION;
160 }
161
162
163 #define CLEAR_PSEUDONYM 0x01
164 #define CLEAR_REAUTH_ID 0x02
165 #define CLEAR_EAP_ID 0x04
166
167 static void eap_sim_clear_identities(struct eap_sim_data *data, int id)
168 {
169 wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old%s%s%s",
170 id & CLEAR_PSEUDONYM ? " pseudonym" : "",
171 id & CLEAR_REAUTH_ID ? " reauth_id" : "",
172 id & CLEAR_EAP_ID ? " eap_id" : "");
173 if (id & CLEAR_PSEUDONYM) {
174 os_free(data->pseudonym);
175 data->pseudonym = NULL;
176 data->pseudonym_len = 0;
177 }
178 if (id & CLEAR_REAUTH_ID) {
179 os_free(data->reauth_id);
180 data->reauth_id = NULL;
181 data->reauth_id_len = 0;
182 }
183 if (id & CLEAR_EAP_ID) {
184 os_free(data->last_eap_identity);
185 data->last_eap_identity = NULL;
186 data->last_eap_identity_len = 0;
187 }
188 }
189
190
191 static int eap_sim_learn_ids(struct eap_sim_data *data,
192 struct eap_sim_attrs *attr)
193 {
194 if (attr->next_pseudonym) {
195 os_free(data->pseudonym);
196 data->pseudonym = os_malloc(attr->next_pseudonym_len);
197 if (data->pseudonym == NULL) {
198 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No memory for "
199 "next pseudonym");
200 return -1;
201 }
202 os_memcpy(data->pseudonym, attr->next_pseudonym,
203 attr->next_pseudonym_len);
204 data->pseudonym_len = attr->next_pseudonym_len;
205 wpa_hexdump_ascii(MSG_DEBUG,
206 "EAP-SIM: (encr) AT_NEXT_PSEUDONYM",
207 data->pseudonym,
208 data->pseudonym_len);
209 }
210
211 if (attr->next_reauth_id) {
212 os_free(data->reauth_id);
213 data->reauth_id = os_malloc(attr->next_reauth_id_len);
214 if (data->reauth_id == NULL) {
215 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No memory for "
216 "next reauth_id");
217 return -1;
218 }
219 os_memcpy(data->reauth_id, attr->next_reauth_id,
220 attr->next_reauth_id_len);
221 data->reauth_id_len = attr->next_reauth_id_len;
222 wpa_hexdump_ascii(MSG_DEBUG,
223 "EAP-SIM: (encr) AT_NEXT_REAUTH_ID",
224 data->reauth_id,
225 data->reauth_id_len);
226 }
227
228 return 0;
229 }
230
231
232 static u8 * eap_sim_client_error(struct eap_sim_data *data,
233 const struct eap_hdr *req,
234 size_t *respDataLen, int err)
235 {
236 struct eap_sim_msg *msg;
237
238 data->state = FAILURE;
239 data->num_id_req = 0;
240 data->num_notification = 0;
241
242 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, req->identifier,
243 EAP_TYPE_SIM, EAP_SIM_SUBTYPE_CLIENT_ERROR);
244 eap_sim_msg_add(msg, EAP_SIM_AT_CLIENT_ERROR_CODE, err, NULL, 0);
245 return eap_sim_msg_finish(msg, respDataLen, NULL, NULL, 0);
246 }
247
248
249 static u8 * eap_sim_response_start(struct eap_sm *sm,
250 struct eap_sim_data *data,
251 const struct eap_hdr *req,
252 size_t *respDataLen,
253 enum eap_sim_id_req id_req)
254 {
255 const u8 *identity = NULL;
256 size_t identity_len = 0;
257 struct eap_sim_msg *msg;
258
259 data->reauth = 0;
260 if (id_req == ANY_ID && data->reauth_id) {
261 identity = data->reauth_id;
262 identity_len = data->reauth_id_len;
263 data->reauth = 1;
264 } else if ((id_req == ANY_ID || id_req == FULLAUTH_ID) &&
265 data->pseudonym) {
266 identity = data->pseudonym;
267 identity_len = data->pseudonym_len;
268 eap_sim_clear_identities(data, CLEAR_REAUTH_ID);
269 } else if (id_req != NO_ID_REQ) {
270 identity = eap_get_config_identity(sm, &identity_len);
271 if (identity) {
272 eap_sim_clear_identities(data, CLEAR_PSEUDONYM |
273 CLEAR_REAUTH_ID);
274 }
275 }
276 if (id_req != NO_ID_REQ)
277 eap_sim_clear_identities(data, CLEAR_EAP_ID);
278
279 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Start (id=%d)",
280 req->identifier);
281 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, req->identifier,
282 EAP_TYPE_SIM, EAP_SIM_SUBTYPE_START);
283 wpa_hexdump(MSG_DEBUG, " AT_NONCE_MT",
284 data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
285 eap_sim_msg_add(msg, EAP_SIM_AT_NONCE_MT, 0,
286 data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
287 wpa_printf(MSG_DEBUG, " AT_SELECTED_VERSION %d",
288 data->selected_version);
289 eap_sim_msg_add(msg, EAP_SIM_AT_SELECTED_VERSION,
290 data->selected_version, NULL, 0);
291
292 if (identity) {
293 wpa_hexdump_ascii(MSG_DEBUG, " AT_IDENTITY",
294 identity, identity_len);
295 eap_sim_msg_add(msg, EAP_SIM_AT_IDENTITY, identity_len,
296 identity, identity_len);
297 }
298
299 return eap_sim_msg_finish(msg, respDataLen, NULL, NULL, 0);
300 }
301
302
303 static u8 * eap_sim_response_challenge(struct eap_sim_data *data,
304 const struct eap_hdr *req,
305 size_t *respDataLen)
306 {
307 struct eap_sim_msg *msg;
308
309 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Challenge (id=%d)",
310 req->identifier);
311 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, req->identifier,
312 EAP_TYPE_SIM, EAP_SIM_SUBTYPE_CHALLENGE);
313 wpa_printf(MSG_DEBUG, " AT_MAC");
314 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
315 return eap_sim_msg_finish(msg, respDataLen, data->k_aut,
316 (u8 *) data->sres,
317 data->num_chal * EAP_SIM_SRES_LEN);
318 }
319
320
321 static u8 * eap_sim_response_reauth(struct eap_sim_data *data,
322 const struct eap_hdr *req,
323 size_t *respDataLen, int counter_too_small)
324 {
325 struct eap_sim_msg *msg;
326 unsigned int counter;
327
328 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Reauthentication (id=%d)",
329 req->identifier);
330 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, req->identifier,
331 EAP_TYPE_SIM,
332 EAP_SIM_SUBTYPE_REAUTHENTICATION);
333 wpa_printf(MSG_DEBUG, " AT_IV");
334 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
335 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA);
336
337 if (counter_too_small) {
338 wpa_printf(MSG_DEBUG, " *AT_COUNTER_TOO_SMALL");
339 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER_TOO_SMALL, 0, NULL, 0);
340 counter = data->counter_too_small;
341 } else
342 counter = data->counter;
343
344 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", counter);
345 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0);
346
347 if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) {
348 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt "
349 "AT_ENCR_DATA");
350 eap_sim_msg_free(msg);
351 return NULL;
352 }
353 wpa_printf(MSG_DEBUG, " AT_MAC");
354 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
355 return eap_sim_msg_finish(msg, respDataLen, data->k_aut, data->nonce_s,
356 EAP_SIM_NONCE_S_LEN);
357 }
358
359
360 static u8 * eap_sim_response_notification(struct eap_sim_data *data,
361 const struct eap_hdr *req,
362 size_t *respDataLen,
363 u16 notification)
364 {
365 struct eap_sim_msg *msg;
366 u8 *k_aut = (notification & 0x4000) == 0 ? data->k_aut : NULL;
367
368 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Notification (id=%d)",
369 req->identifier);
370 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, req->identifier,
371 EAP_TYPE_SIM, EAP_SIM_SUBTYPE_NOTIFICATION);
372 wpa_printf(MSG_DEBUG, " AT_NOTIFICATION");
373 eap_sim_msg_add(msg, EAP_SIM_AT_NOTIFICATION, notification, NULL, 0);
374 if (k_aut && data->reauth) {
375 wpa_printf(MSG_DEBUG, " AT_IV");
376 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
377 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV,
378 EAP_SIM_AT_ENCR_DATA);
379 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", data->counter);
380 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter,
381 NULL, 0);
382 if (eap_sim_msg_add_encr_end(msg, data->k_encr,
383 EAP_SIM_AT_PADDING)) {
384 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt "
385 "AT_ENCR_DATA");
386 eap_sim_msg_free(msg);
387 return NULL;
388 }
389 }
390 if (k_aut) {
391 wpa_printf(MSG_DEBUG, " AT_MAC");
392 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
393 }
394 return eap_sim_msg_finish(msg, respDataLen, k_aut, (u8 *) "", 0);
395 }
396
397
398 static u8 * eap_sim_process_start(struct eap_sm *sm, struct eap_sim_data *data,
399 const struct eap_hdr *req,
400 size_t *respDataLen,
401 struct eap_sim_attrs *attr)
402 {
403 int selected_version = -1, id_error;
404 size_t i;
405 u8 *pos;
406
407 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Start");
408 if (attr->version_list == NULL) {
409 wpa_printf(MSG_INFO, "EAP-SIM: No AT_VERSION_LIST in "
410 "SIM/Start");
411 return eap_sim_client_error(data, req, respDataLen,
412 EAP_SIM_UNSUPPORTED_VERSION);
413 }
414
415 os_free(data->ver_list);
416 data->ver_list = os_malloc(attr->version_list_len);
417 if (data->ver_list == NULL) {
418 wpa_printf(MSG_DEBUG, "EAP-SIM: Failed to allocate "
419 "memory for version list");
420 return eap_sim_client_error(data, req, respDataLen,
421 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
422 }
423 os_memcpy(data->ver_list, attr->version_list, attr->version_list_len);
424 data->ver_list_len = attr->version_list_len;
425 pos = data->ver_list;
426 for (i = 0; i < data->ver_list_len / 2; i++) {
427 int ver = pos[0] * 256 + pos[1];
428 pos += 2;
429 if (eap_sim_supported_ver(ver)) {
430 selected_version = ver;
431 break;
432 }
433 }
434 if (selected_version < 0) {
435 wpa_printf(MSG_INFO, "EAP-SIM: Could not find a supported "
436 "version");
437 return eap_sim_client_error(data, req, respDataLen,
438 EAP_SIM_UNSUPPORTED_VERSION);
439 }
440 wpa_printf(MSG_DEBUG, "EAP-SIM: Selected Version %d",
441 selected_version);
442 data->selected_version = selected_version;
443
444 id_error = 0;
445 switch (attr->id_req) {
446 case NO_ID_REQ:
447 break;
448 case ANY_ID:
449 if (data->num_id_req > 0)
450 id_error++;
451 data->num_id_req++;
452 break;
453 case FULLAUTH_ID:
454 if (data->num_id_req > 1)
455 id_error++;
456 data->num_id_req++;
457 break;
458 case PERMANENT_ID:
459 if (data->num_id_req > 2)
460 id_error++;
461 data->num_id_req++;
462 break;
463 }
464 if (id_error) {
465 wpa_printf(MSG_INFO, "EAP-SIM: Too many ID requests "
466 "used within one authentication");
467 return eap_sim_client_error(data, req, respDataLen,
468 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
469 }
470
471 return eap_sim_response_start(sm, data, req, respDataLen,
472 attr->id_req);
473 }
474
475
476 static u8 * eap_sim_process_challenge(struct eap_sm *sm,
477 struct eap_sim_data *data,
478 const struct eap_hdr *req,
479 size_t reqDataLen,
480 size_t *respDataLen,
481 struct eap_sim_attrs *attr)
482 {
483 const u8 *identity;
484 size_t identity_len;
485 struct eap_sim_attrs eattr;
486
487 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Challenge");
488 data->reauth = 0;
489 if (!attr->mac || !attr->rand) {
490 wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message "
491 "did not include%s%s",
492 !attr->mac ? " AT_MAC" : "",
493 !attr->rand ? " AT_RAND" : "");
494 return eap_sim_client_error(data, req, respDataLen,
495 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
496 }
497
498 wpa_printf(MSG_DEBUG, "EAP-SIM: %lu challenges",
499 (unsigned long) attr->num_chal);
500 if (attr->num_chal < data->min_num_chal) {
501 wpa_printf(MSG_INFO, "EAP-SIM: Insufficient number of "
502 "challenges (%lu)", (unsigned long) attr->num_chal);
503 return eap_sim_client_error(data, req, respDataLen,
504 EAP_SIM_INSUFFICIENT_NUM_OF_CHAL);
505 }
506 if (attr->num_chal > 3) {
507 wpa_printf(MSG_INFO, "EAP-SIM: Too many challenges "
508 "(%lu)", (unsigned long) attr->num_chal);
509 return eap_sim_client_error(data, req, respDataLen,
510 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
511 }
512
513 /* Verify that RANDs are different */
514 if (os_memcmp(attr->rand, attr->rand + GSM_RAND_LEN,
515 GSM_RAND_LEN) == 0 ||
516 (attr->num_chal > 2 &&
517 (os_memcmp(attr->rand, attr->rand + 2 * GSM_RAND_LEN,
518 GSM_RAND_LEN) == 0 ||
519 os_memcmp(attr->rand + GSM_RAND_LEN,
520 attr->rand + 2 * GSM_RAND_LEN,
521 GSM_RAND_LEN) == 0))) {
522 wpa_printf(MSG_INFO, "EAP-SIM: Same RAND used multiple times");
523 return eap_sim_client_error(data, req, respDataLen,
524 EAP_SIM_RAND_NOT_FRESH);
525 }
526
527 os_memcpy(data->rand, attr->rand, attr->num_chal * GSM_RAND_LEN);
528 data->num_chal = attr->num_chal;
529
530 if (eap_sim_gsm_auth(sm, data)) {
531 wpa_printf(MSG_WARNING, "EAP-SIM: GSM authentication failed");
532 return eap_sim_client_error(data, req, respDataLen,
533 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
534 }
535 if (data->last_eap_identity) {
536 identity = data->last_eap_identity;
537 identity_len = data->last_eap_identity_len;
538 } else if (data->pseudonym) {
539 identity = data->pseudonym;
540 identity_len = data->pseudonym_len;
541 } else
542 identity = eap_get_config_identity(sm, &identity_len);
543 wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM: Selected identity for MK "
544 "derivation", identity, identity_len);
545 eap_sim_derive_mk(identity, identity_len, data->nonce_mt,
546 data->selected_version, data->ver_list,
547 data->ver_list_len, data->num_chal,
548 (const u8 *) data->kc, data->mk);
549 eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut, data->msk,
550 data->emsk);
551 if (eap_sim_verify_mac(data->k_aut, (const u8 *) req, reqDataLen,
552 attr->mac, data->nonce_mt,
553 EAP_SIM_NONCE_MT_LEN)) {
554 wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message "
555 "used invalid AT_MAC");
556 return eap_sim_client_error(data, req, respDataLen,
557 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
558 }
559
560 /* Old reauthentication and pseudonym identities must not be used
561 * anymore. In other words, if no new identities are received, full
562 * authentication will be used on next reauthentication. */
563 eap_sim_clear_identities(data, CLEAR_PSEUDONYM | CLEAR_REAUTH_ID |
564 CLEAR_EAP_ID);
565
566 if (attr->encr_data) {
567 u8 *decrypted;
568 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
569 attr->encr_data_len, attr->iv,
570 &eattr, 0);
571 if (decrypted == NULL) {
572 return eap_sim_client_error(
573 data, req, respDataLen,
574 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
575 }
576 eap_sim_learn_ids(data, &eattr);
577 os_free(decrypted);
578 }
579
580 if (data->state != FAILURE)
581 data->state = SUCCESS;
582
583 data->num_id_req = 0;
584 data->num_notification = 0;
585 /* RFC 4186 specifies that counter is initialized to one after
586 * fullauth, but initializing it to zero makes it easier to implement
587 * reauth verification. */
588 data->counter = 0;
589 return eap_sim_response_challenge(data, req, respDataLen);
590 }
591
592
593 static int eap_sim_process_notification_reauth(struct eap_sim_data *data,
594 struct eap_sim_attrs *attr)
595 {
596 struct eap_sim_attrs eattr;
597 u8 *decrypted;
598
599 if (attr->encr_data == NULL || attr->iv == NULL) {
600 wpa_printf(MSG_WARNING, "EAP-SIM: Notification message after "
601 "reauth did not include encrypted data");
602 return -1;
603 }
604
605 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
606 attr->encr_data_len, attr->iv, &eattr,
607 0);
608 if (decrypted == NULL) {
609 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted "
610 "data from notification message");
611 return -1;
612 }
613
614 if (eattr.counter < 0 || (size_t) eattr.counter != data->counter) {
615 wpa_printf(MSG_WARNING, "EAP-SIM: Counter in notification "
616 "message does not match with counter in reauth "
617 "message");
618 os_free(decrypted);
619 return -1;
620 }
621
622 os_free(decrypted);
623 return 0;
624 }
625
626
627 static int eap_sim_process_notification_auth(struct eap_sim_data *data,
628 const struct eap_hdr *req,
629 size_t reqDataLen,
630 struct eap_sim_attrs *attr)
631 {
632 if (attr->mac == NULL) {
633 wpa_printf(MSG_INFO, "EAP-SIM: no AT_MAC in after_auth "
634 "Notification message");
635 return -1;
636 }
637
638 if (eap_sim_verify_mac(data->k_aut, (u8 *) req, reqDataLen, attr->mac,
639 (u8 *) "", 0)) {
640 wpa_printf(MSG_WARNING, "EAP-SIM: Notification message "
641 "used invalid AT_MAC");
642 return -1;
643 }
644
645 if (data->reauth &&
646 eap_sim_process_notification_reauth(data, attr)) {
647 wpa_printf(MSG_WARNING, "EAP-SIM: Invalid notification "
648 "message after reauth");
649 return -1;
650 }
651
652 return 0;
653 }
654
655
656 static u8 * eap_sim_process_notification(struct eap_sm *sm,
657 struct eap_sim_data *data,
658 const struct eap_hdr *req,
659 size_t reqDataLen,
660 size_t *respDataLen,
661 struct eap_sim_attrs *attr)
662 {
663 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Notification");
664 if (data->num_notification > 0) {
665 wpa_printf(MSG_INFO, "EAP-SIM: too many notification "
666 "rounds (only one allowed)");
667 return eap_sim_client_error(data, req, respDataLen,
668 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
669 }
670 data->num_notification++;
671 if (attr->notification == -1) {
672 wpa_printf(MSG_INFO, "EAP-SIM: no AT_NOTIFICATION in "
673 "Notification message");
674 return eap_sim_client_error(data, req, respDataLen,
675 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
676 }
677
678 if ((attr->notification & 0x4000) == 0 &&
679 eap_sim_process_notification_auth(data, req, reqDataLen, attr)) {
680 return eap_sim_client_error(data, req, respDataLen,
681 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
682 }
683
684 eap_sim_report_notification(sm->msg_ctx, attr->notification, 0);
685 if (attr->notification >= 0 && attr->notification < 32768) {
686 data->state = FAILURE;
687 }
688 return eap_sim_response_notification(data, req, respDataLen,
689 attr->notification);
690 }
691
692
693 static u8 * eap_sim_process_reauthentication(struct eap_sm *sm,
694 struct eap_sim_data *data,
695 const struct eap_hdr *req,
696 size_t reqDataLen,
697 size_t *respDataLen,
698 struct eap_sim_attrs *attr)
699 {
700 struct eap_sim_attrs eattr;
701 u8 *decrypted;
702
703 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Reauthentication");
704
705 if (data->reauth_id == NULL) {
706 wpa_printf(MSG_WARNING, "EAP-SIM: Server is trying "
707 "reauthentication, but no reauth_id available");
708 return eap_sim_client_error(data, req, respDataLen,
709 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
710 }
711
712 data->reauth = 1;
713 if (eap_sim_verify_mac(data->k_aut, (const u8 *) req, reqDataLen,
714 attr->mac, (u8 *) "", 0)) {
715 wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication "
716 "did not have valid AT_MAC");
717 return eap_sim_client_error(data, req, respDataLen,
718 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
719 }
720
721 if (attr->encr_data == NULL || attr->iv == NULL) {
722 wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication "
723 "message did not include encrypted data");
724 return eap_sim_client_error(data, req, respDataLen,
725 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
726 }
727
728 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
729 attr->encr_data_len, attr->iv, &eattr,
730 0);
731 if (decrypted == NULL) {
732 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted "
733 "data from reauthentication message");
734 return eap_sim_client_error(data, req, respDataLen,
735 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
736 }
737
738 if (eattr.nonce_s == NULL || eattr.counter < 0) {
739 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No%s%s in reauth packet",
740 !eattr.nonce_s ? " AT_NONCE_S" : "",
741 eattr.counter < 0 ? " AT_COUNTER" : "");
742 os_free(decrypted);
743 return eap_sim_client_error(data, req, respDataLen,
744 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
745 }
746
747 if (eattr.counter < 0 || (size_t) eattr.counter <= data->counter) {
748 wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid counter "
749 "(%d <= %d)", eattr.counter, data->counter);
750 data->counter_too_small = eattr.counter;
751 /* Reply using Re-auth w/ AT_COUNTER_TOO_SMALL. The current
752 * reauth_id must not be used to start a new reauthentication.
753 * However, since it was used in the last EAP-Response-Identity
754 * packet, it has to saved for the following fullauth to be
755 * used in MK derivation. */
756 os_free(data->last_eap_identity);
757 data->last_eap_identity = data->reauth_id;
758 data->last_eap_identity_len = data->reauth_id_len;
759 data->reauth_id = NULL;
760 data->reauth_id_len = 0;
761 os_free(decrypted);
762 return eap_sim_response_reauth(data, req, respDataLen, 1);
763 }
764 data->counter = eattr.counter;
765
766 os_memcpy(data->nonce_s, eattr.nonce_s, EAP_SIM_NONCE_S_LEN);
767 wpa_hexdump(MSG_DEBUG, "EAP-SIM: (encr) AT_NONCE_S",
768 data->nonce_s, EAP_SIM_NONCE_S_LEN);
769
770 eap_sim_derive_keys_reauth(data->counter,
771 data->reauth_id, data->reauth_id_len,
772 data->nonce_s, data->mk, data->msk,
773 data->emsk);
774 eap_sim_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
775 eap_sim_learn_ids(data, &eattr);
776
777 if (data->state != FAILURE)
778 data->state = SUCCESS;
779
780 data->num_id_req = 0;
781 data->num_notification = 0;
782 if (data->counter > EAP_SIM_MAX_FAST_REAUTHS) {
783 wpa_printf(MSG_DEBUG, "EAP-SIM: Maximum number of "
784 "fast reauths performed - force fullauth");
785 eap_sim_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
786 }
787 os_free(decrypted);
788 return eap_sim_response_reauth(data, req, respDataLen, 0);
789 }
790
791
792 static u8 * eap_sim_process(struct eap_sm *sm, void *priv,
793 struct eap_method_ret *ret,
794 const u8 *reqData, size_t reqDataLen,
795 size_t *respDataLen)
796 {
797 struct eap_sim_data *data = priv;
798 const struct eap_hdr *req;
799 u8 subtype, *res;
800 const u8 *pos;
801 struct eap_sim_attrs attr;
802 size_t len;
803
804 wpa_hexdump(MSG_DEBUG, "EAP-SIM: EAP data", reqData, reqDataLen);
805 if (eap_get_config_identity(sm, &len) == NULL) {
806 wpa_printf(MSG_INFO, "EAP-SIM: Identity not configured");
807 eap_sm_request_identity(sm);
808 ret->ignore = TRUE;
809 return NULL;
810 }
811
812 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_SIM,
813 reqData, reqDataLen, &len);
814 if (pos == NULL || len < 1) {
815 ret->ignore = TRUE;
816 return NULL;
817 }
818 req = (const struct eap_hdr *) reqData;
819 len = be_to_host16(req->length);
820
821 ret->ignore = FALSE;
822 ret->methodState = METHOD_MAY_CONT;
823 ret->decision = DECISION_FAIL;
824 ret->allowNotifications = TRUE;
825
826 subtype = *pos++;
827 wpa_printf(MSG_DEBUG, "EAP-SIM: Subtype=%d", subtype);
828 pos += 2; /* Reserved */
829
830 if (eap_sim_parse_attr(pos, reqData + len, &attr, 0, 0)) {
831 res = eap_sim_client_error(data, req, respDataLen,
832 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
833 goto done;
834 }
835
836 switch (subtype) {
837 case EAP_SIM_SUBTYPE_START:
838 res = eap_sim_process_start(sm, data, req,
839 respDataLen, &attr);
840 break;
841 case EAP_SIM_SUBTYPE_CHALLENGE:
842 res = eap_sim_process_challenge(sm, data, req, len,
843 respDataLen, &attr);
844 break;
845 case EAP_SIM_SUBTYPE_NOTIFICATION:
846 res = eap_sim_process_notification(sm, data, req, len,
847 respDataLen, &attr);
848 break;
849 case EAP_SIM_SUBTYPE_REAUTHENTICATION:
850 res = eap_sim_process_reauthentication(sm, data, req, len,
851 respDataLen, &attr);
852 break;
853 case EAP_SIM_SUBTYPE_CLIENT_ERROR:
854 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Client-Error");
855 res = eap_sim_client_error(data, req, respDataLen,
856 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
857 break;
858 default:
859 wpa_printf(MSG_DEBUG, "EAP-SIM: Unknown subtype=%d", subtype);
860 res = eap_sim_client_error(data, req, respDataLen,
861 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
862 break;
863 }
864
865 done:
866 if (data->state == FAILURE) {
867 ret->decision = DECISION_FAIL;
868 ret->methodState = METHOD_DONE;
869 } else if (data->state == SUCCESS) {
870 ret->decision = DECISION_COND_SUCC;
871 ret->methodState = METHOD_DONE;
872 }
873
874 if (ret->methodState == METHOD_DONE) {
875 ret->allowNotifications = FALSE;
876 }
877
878 return res;
879 }
880
881
882 static Boolean eap_sim_has_reauth_data(struct eap_sm *sm, void *priv)
883 {
884 struct eap_sim_data *data = priv;
885 return data->pseudonym || data->reauth_id;
886 }
887
888
889 static void eap_sim_deinit_for_reauth(struct eap_sm *sm, void *priv)
890 {
891 struct eap_sim_data *data = priv;
892 eap_sim_clear_identities(data, CLEAR_EAP_ID);
893 }
894
895
896 static void * eap_sim_init_for_reauth(struct eap_sm *sm, void *priv)
897 {
898 struct eap_sim_data *data = priv;
899 if (hostapd_get_rand(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) {
900 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data "
901 "for NONCE_MT");
902 os_free(data);
903 return NULL;
904 }
905 data->num_id_req = 0;
906 data->num_notification = 0;
907 data->state = CONTINUE;
908 return priv;
909 }
910
911
912 static const u8 * eap_sim_get_identity(struct eap_sm *sm, void *priv,
913 size_t *len)
914 {
915 struct eap_sim_data *data = priv;
916
917 if (data->reauth_id) {
918 *len = data->reauth_id_len;
919 return data->reauth_id;
920 }
921
922 if (data->pseudonym) {
923 *len = data->pseudonym_len;
924 return data->pseudonym;
925 }
926
927 return NULL;
928 }
929
930
931 static Boolean eap_sim_isKeyAvailable(struct eap_sm *sm, void *priv)
932 {
933 struct eap_sim_data *data = priv;
934 return data->state == SUCCESS;
935 }
936
937
938 static u8 * eap_sim_getKey(struct eap_sm *sm, void *priv, size_t *len)
939 {
940 struct eap_sim_data *data = priv;
941 u8 *key;
942
943 if (data->state != SUCCESS)
944 return NULL;
945
946 key = os_malloc(EAP_SIM_KEYING_DATA_LEN);
947 if (key == NULL)
948 return NULL;
949
950 *len = EAP_SIM_KEYING_DATA_LEN;
951 os_memcpy(key, data->msk, EAP_SIM_KEYING_DATA_LEN);
952
953 return key;
954 }
955
956
957 static u8 * eap_sim_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
958 {
959 struct eap_sim_data *data = priv;
960 u8 *key;
961
962 if (data->state != SUCCESS)
963 return NULL;
964
965 key = os_malloc(EAP_EMSK_LEN);
966 if (key == NULL)
967 return NULL;
968
969 *len = EAP_EMSK_LEN;
970 os_memcpy(key, data->emsk, EAP_EMSK_LEN);
971
972 return key;
973 }
974
975
976 int eap_peer_sim_register(void)
977 {
978 struct eap_method *eap;
979 int ret;
980
981 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
982 EAP_VENDOR_IETF, EAP_TYPE_SIM, "SIM");
983 if (eap == NULL)
984 return -1;
985
986 eap->init = eap_sim_init;
987 eap->deinit = eap_sim_deinit;
988 eap->process = eap_sim_process;
989 eap->isKeyAvailable = eap_sim_isKeyAvailable;
990 eap->getKey = eap_sim_getKey;
991 eap->has_reauth_data = eap_sim_has_reauth_data;
992 eap->deinit_for_reauth = eap_sim_deinit_for_reauth;
993 eap->init_for_reauth = eap_sim_init_for_reauth;
994 eap->get_identity = eap_sim_get_identity;
995 eap->get_emsk = eap_sim_get_emsk;
996
997 ret = eap_peer_method_register(eap);
998 if (ret)
999 eap_peer_method_free(eap);
1000 return ret;
1001 }
DragonFly BSD