1 /*
2 * EAP peer method: EAP-SIM (RFC 4186)
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/milenage.h"
14 #include "crypto/random.h"
15 #include "eap_peer/eap_i.h"
16 #include "eap_config.h"
17 #include "eap_common/eap_sim_common.h"
18
19
20 struct eap_sim_data {
21 u8 *ver_list;
22 size_t ver_list_len;
23 int selected_version;
24 size_t min_num_chal, num_chal;
25
26 u8 kc[3][EAP_SIM_KC_LEN];
27 u8 sres[3][EAP_SIM_SRES_LEN];
28 u8 nonce_mt[EAP_SIM_NONCE_MT_LEN], nonce_s[EAP_SIM_NONCE_S_LEN];
29 u8 mk[EAP_SIM_MK_LEN];
30 u8 k_aut[EAP_SIM_K_AUT_LEN];
31 u8 k_encr[EAP_SIM_K_ENCR_LEN];
32 u8 msk[EAP_SIM_KEYING_DATA_LEN];
33 u8 emsk[EAP_EMSK_LEN];
34 u8 rand[3][GSM_RAND_LEN];
35
36 int num_id_req, num_notification;
37 u8 *pseudonym;
38 size_t pseudonym_len;
39 u8 *reauth_id;
40 size_t reauth_id_len;
41 int reauth;
42 unsigned int counter, counter_too_small;
43 u8 *last_eap_identity;
44 size_t last_eap_identity_len;
45 enum {
46 CONTINUE, RESULT_SUCCESS, SUCCESS, FAILURE
47 } state;
48 int result_ind, use_result_ind;
49 int use_pseudonym;
50 };
51
52
53 #ifndef CONFIG_NO_STDOUT_DEBUG
eap_sim_state_txt(int state)54 static const char * eap_sim_state_txt(int state)
55 {
56 switch (state) {
57 case CONTINUE:
58 return "CONTINUE";
59 case RESULT_SUCCESS:
60 return "RESULT_SUCCESS";
61 case SUCCESS:
62 return "SUCCESS";
63 case FAILURE:
64 return "FAILURE";
65 default:
66 return "?";
67 }
68 }
69 #endif /* CONFIG_NO_STDOUT_DEBUG */
70
71
eap_sim_state(struct eap_sim_data * data,int state)72 static void eap_sim_state(struct eap_sim_data *data, int state)
73 {
74 wpa_printf(MSG_DEBUG, "EAP-SIM: %s -> %s",
75 eap_sim_state_txt(data->state),
76 eap_sim_state_txt(state));
77 data->state = state;
78 }
79
80
eap_sim_init(struct eap_sm * sm)81 static void * eap_sim_init(struct eap_sm *sm)
82 {
83 struct eap_sim_data *data;
84 struct eap_peer_config *config = eap_get_config(sm);
85
86 data = os_zalloc(sizeof(*data));
87 if (data == NULL)
88 return NULL;
89
90 if (random_get_bytes(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) {
91 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data "
92 "for NONCE_MT");
93 os_free(data);
94 return NULL;
95 }
96
97 data->min_num_chal = 2;
98 if (config && config->phase1) {
99 char *pos = os_strstr(config->phase1, "sim_min_num_chal=");
100 if (pos) {
101 data->min_num_chal = atoi(pos + 17);
102 if (data->min_num_chal < 2 || data->min_num_chal > 3) {
103 wpa_printf(MSG_WARNING, "EAP-SIM: Invalid "
104 "sim_min_num_chal configuration "
105 "(%lu, expected 2 or 3)",
106 (unsigned long) data->min_num_chal);
107 os_free(data);
108 return NULL;
109 }
110 wpa_printf(MSG_DEBUG, "EAP-SIM: Set minimum number of "
111 "challenges to %lu",
112 (unsigned long) data->min_num_chal);
113 }
114
115 data->result_ind = os_strstr(config->phase1, "result_ind=1") !=
116 NULL;
117 }
118
119 data->use_pseudonym = !sm->init_phase2;
120 if (config && config->anonymous_identity && data->use_pseudonym) {
121 data->pseudonym = os_malloc(config->anonymous_identity_len);
122 if (data->pseudonym) {
123 os_memcpy(data->pseudonym, config->anonymous_identity,
124 config->anonymous_identity_len);
125 data->pseudonym_len = config->anonymous_identity_len;
126 }
127 }
128
129 eap_sim_state(data, CONTINUE);
130
131 return data;
132 }
133
134
eap_sim_clear_keys(struct eap_sim_data * data,int reauth)135 static void eap_sim_clear_keys(struct eap_sim_data *data, int reauth)
136 {
137 if (!reauth) {
138 os_memset(data->mk, 0, EAP_SIM_MK_LEN);
139 os_memset(data->k_aut, 0, EAP_SIM_K_AUT_LEN);
140 os_memset(data->k_encr, 0, EAP_SIM_K_ENCR_LEN);
141 }
142 os_memset(data->kc, 0, 3 * EAP_SIM_KC_LEN);
143 os_memset(data->sres, 0, 3 * EAP_SIM_SRES_LEN);
144 os_memset(data->msk, 0, EAP_SIM_KEYING_DATA_LEN);
145 os_memset(data->emsk, 0, EAP_EMSK_LEN);
146 }
147
148
eap_sim_deinit(struct eap_sm * sm,void * priv)149 static void eap_sim_deinit(struct eap_sm *sm, void *priv)
150 {
151 struct eap_sim_data *data = priv;
152 if (data) {
153 os_free(data->ver_list);
154 os_free(data->pseudonym);
155 os_free(data->reauth_id);
156 os_free(data->last_eap_identity);
157 eap_sim_clear_keys(data, 0);
158 os_free(data);
159 }
160 }
161
162
eap_sim_ext_sim_req(struct eap_sm * sm,struct eap_sim_data * data)163 static int eap_sim_ext_sim_req(struct eap_sm *sm, struct eap_sim_data *data)
164 {
165 char req[200], *pos, *end;
166 size_t i;
167
168 wpa_printf(MSG_DEBUG, "EAP-SIM: Use external SIM processing");
169 pos = req;
170 end = pos + sizeof(req);
171 pos += os_snprintf(pos, end - pos, "GSM-AUTH");
172 for (i = 0; i < data->num_chal; i++) {
173 pos += os_snprintf(pos, end - pos, ":");
174 pos += wpa_snprintf_hex(pos, end - pos, data->rand[i],
175 GSM_RAND_LEN);
176 }
177
178 eap_sm_request_sim(sm, req);
179 return 1;
180 }
181
182
eap_sim_ext_sim_result(struct eap_sm * sm,struct eap_sim_data * data,struct eap_peer_config * conf)183 static int eap_sim_ext_sim_result(struct eap_sm *sm, struct eap_sim_data *data,
184 struct eap_peer_config *conf)
185 {
186 char *resp, *pos;
187 size_t i;
188
189 wpa_printf(MSG_DEBUG,
190 "EAP-SIM: Use result from external SIM processing");
191
192 resp = conf->external_sim_resp;
193 conf->external_sim_resp = NULL;
194
195 if (os_strncmp(resp, "GSM-AUTH:", 9) != 0) {
196 wpa_printf(MSG_DEBUG, "EAP-SIM: Unrecognized external SIM processing response");
197 os_free(resp);
198 return -1;
199 }
200
201 pos = resp + 9;
202 for (i = 0; i < data->num_chal; i++) {
203 wpa_hexdump(MSG_DEBUG, "EAP-SIM: RAND",
204 data->rand[i], GSM_RAND_LEN);
205
206 if (hexstr2bin(pos, data->kc[i], EAP_SIM_KC_LEN) < 0)
207 goto invalid;
208 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: Kc",
209 data->kc[i], EAP_SIM_KC_LEN);
210 pos += EAP_SIM_KC_LEN * 2;
211 if (*pos != ':')
212 goto invalid;
213 pos++;
214
215 if (hexstr2bin(pos, data->sres[i], EAP_SIM_SRES_LEN) < 0)
216 goto invalid;
217 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: SRES",
218 data->sres[i], EAP_SIM_SRES_LEN);
219 pos += EAP_SIM_SRES_LEN * 2;
220 if (i + 1 < data->num_chal) {
221 if (*pos != ':')
222 goto invalid;
223 pos++;
224 }
225 }
226
227 os_free(resp);
228 return 0;
229
230 invalid:
231 wpa_printf(MSG_DEBUG, "EAP-SIM: Invalid external SIM processing GSM-AUTH response");
232 os_free(resp);
233 return -1;
234 }
235
236
eap_sim_gsm_auth(struct eap_sm * sm,struct eap_sim_data * data)237 static int eap_sim_gsm_auth(struct eap_sm *sm, struct eap_sim_data *data)
238 {
239 struct eap_peer_config *conf;
240
241 wpa_printf(MSG_DEBUG, "EAP-SIM: GSM authentication algorithm");
242
243 conf = eap_get_config(sm);
244 if (conf == NULL)
245 return -1;
246
247 if (sm->external_sim) {
248 if (conf->external_sim_resp)
249 return eap_sim_ext_sim_result(sm, data, conf);
250 else
251 return eap_sim_ext_sim_req(sm, data);
252 }
253
254 #ifdef PCSC_FUNCS
255 if (conf->pcsc) {
256 if (scard_gsm_auth(sm->scard_ctx, data->rand[0],
257 data->sres[0], data->kc[0]) ||
258 scard_gsm_auth(sm->scard_ctx, data->rand[1],
259 data->sres[1], data->kc[1]) ||
260 (data->num_chal > 2 &&
261 scard_gsm_auth(sm->scard_ctx, data->rand[2],
262 data->sres[2], data->kc[2]))) {
263 wpa_printf(MSG_DEBUG, "EAP-SIM: GSM SIM "
264 "authentication could not be completed");
265 return -1;
266 }
267 return 0;
268 }
269 #endif /* PCSC_FUNCS */
270
271 #ifdef CONFIG_SIM_SIMULATOR
272 if (conf->password) {
273 u8 opc[16], k[16];
274 const char *pos;
275 size_t i;
276 wpa_printf(MSG_DEBUG, "EAP-SIM: Use internal GSM-Milenage "
277 "implementation for authentication");
278 if (conf->password_len < 65) {
279 wpa_printf(MSG_DEBUG, "EAP-SIM: invalid GSM-Milenage "
280 "password");
281 return -1;
282 }
283 pos = (const char *) conf->password;
284 if (hexstr2bin(pos, k, 16))
285 return -1;
286 pos += 32;
287 if (*pos != ':')
288 return -1;
289 pos++;
290
291 if (hexstr2bin(pos, opc, 16))
292 return -1;
293
294 for (i = 0; i < data->num_chal; i++) {
295 if (gsm_milenage(opc, k, data->rand[i],
296 data->sres[i], data->kc[i])) {
297 wpa_printf(MSG_DEBUG, "EAP-SIM: "
298 "GSM-Milenage authentication "
299 "could not be completed");
300 return -1;
301 }
302 wpa_hexdump(MSG_DEBUG, "EAP-SIM: RAND",
303 data->rand[i], GSM_RAND_LEN);
304 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: SRES",
305 data->sres[i], EAP_SIM_SRES_LEN);
306 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: Kc",
307 data->kc[i], EAP_SIM_KC_LEN);
308 }
309 return 0;
310 }
311 #endif /* CONFIG_SIM_SIMULATOR */
312
313 #ifdef CONFIG_SIM_HARDCODED
314 /* These hardcoded Kc and SRES values are used for testing. RAND to
315 * KC/SREC mapping is very bogus as far as real authentication is
316 * concerned, but it is quite useful for cases where the AS is rotating
317 * the order of pre-configured values. */
318 {
319 size_t i;
320
321 wpa_printf(MSG_DEBUG, "EAP-SIM: Use hardcoded Kc and SRES "
322 "values for testing");
323
324 for (i = 0; i < data->num_chal; i++) {
325 if (data->rand[i][0] == 0xaa) {
326 os_memcpy(data->kc[i],
327 "\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7",
328 EAP_SIM_KC_LEN);
329 os_memcpy(data->sres[i], "\xd1\xd2\xd3\xd4",
330 EAP_SIM_SRES_LEN);
331 } else if (data->rand[i][0] == 0xbb) {
332 os_memcpy(data->kc[i],
333 "\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7",
334 EAP_SIM_KC_LEN);
335 os_memcpy(data->sres[i], "\xe1\xe2\xe3\xe4",
336 EAP_SIM_SRES_LEN);
337 } else {
338 os_memcpy(data->kc[i],
339 "\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7",
340 EAP_SIM_KC_LEN);
341 os_memcpy(data->sres[i], "\xf1\xf2\xf3\xf4",
342 EAP_SIM_SRES_LEN);
343 }
344 }
345 }
346
347 return 0;
348
349 #else /* CONFIG_SIM_HARDCODED */
350
351 wpa_printf(MSG_DEBUG, "EAP-SIM: No GSM authentication algorithm "
352 "enabled");
353 return -1;
354
355 #endif /* CONFIG_SIM_HARDCODED */
356 }
357
358
eap_sim_supported_ver(int version)359 static int eap_sim_supported_ver(int version)
360 {
361 return version == EAP_SIM_VERSION;
362 }
363
364
365 #define CLEAR_PSEUDONYM 0x01
366 #define CLEAR_REAUTH_ID 0x02
367 #define CLEAR_EAP_ID 0x04
368
eap_sim_clear_identities(struct eap_sm * sm,struct eap_sim_data * data,int id)369 static void eap_sim_clear_identities(struct eap_sm *sm,
370 struct eap_sim_data *data, int id)
371 {
372 if ((id & CLEAR_PSEUDONYM) && data->pseudonym) {
373 wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old pseudonym");
374 os_free(data->pseudonym);
375 data->pseudonym = NULL;
376 data->pseudonym_len = 0;
377 if (data->use_pseudonym)
378 eap_set_anon_id(sm, NULL, 0);
379 }
380 if ((id & CLEAR_REAUTH_ID) && data->reauth_id) {
381 wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old reauth_id");
382 os_free(data->reauth_id);
383 data->reauth_id = NULL;
384 data->reauth_id_len = 0;
385 }
386 if ((id & CLEAR_EAP_ID) && data->last_eap_identity) {
387 wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old eap_id");
388 os_free(data->last_eap_identity);
389 data->last_eap_identity = NULL;
390 data->last_eap_identity_len = 0;
391 }
392 }
393
394
eap_sim_learn_ids(struct eap_sm * sm,struct eap_sim_data * data,struct eap_sim_attrs * attr)395 static int eap_sim_learn_ids(struct eap_sm *sm, struct eap_sim_data *data,
396 struct eap_sim_attrs *attr)
397 {
398 if (attr->next_pseudonym) {
399 const u8 *identity = NULL;
400 size_t identity_len = 0;
401 const u8 *realm = NULL;
402 size_t realm_len = 0;
403
404 wpa_hexdump_ascii(MSG_DEBUG,
405 "EAP-SIM: (encr) AT_NEXT_PSEUDONYM",
406 attr->next_pseudonym,
407 attr->next_pseudonym_len);
408 os_free(data->pseudonym);
409 /* Look for the realm of the permanent identity */
410 identity = eap_get_config_identity(sm, &identity_len);
411 if (identity) {
412 for (realm = identity, realm_len = identity_len;
413 realm_len > 0; realm_len--, realm++) {
414 if (*realm == '@')
415 break;
416 }
417 }
418 data->pseudonym = os_malloc(attr->next_pseudonym_len +
419 realm_len);
420 if (data->pseudonym == NULL) {
421 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No memory for "
422 "next pseudonym");
423 data->pseudonym_len = 0;
424 return -1;
425 }
426 os_memcpy(data->pseudonym, attr->next_pseudonym,
427 attr->next_pseudonym_len);
428 if (realm_len) {
429 os_memcpy(data->pseudonym + attr->next_pseudonym_len,
430 realm, realm_len);
431 }
432 data->pseudonym_len = attr->next_pseudonym_len + realm_len;
433 if (data->use_pseudonym)
434 eap_set_anon_id(sm, data->pseudonym,
435 data->pseudonym_len);
436 }
437
438 if (attr->next_reauth_id) {
439 os_free(data->reauth_id);
440 data->reauth_id = os_malloc(attr->next_reauth_id_len);
441 if (data->reauth_id == NULL) {
442 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No memory for "
443 "next reauth_id");
444 data->reauth_id_len = 0;
445 return -1;
446 }
447 os_memcpy(data->reauth_id, attr->next_reauth_id,
448 attr->next_reauth_id_len);
449 data->reauth_id_len = attr->next_reauth_id_len;
450 wpa_hexdump_ascii(MSG_DEBUG,
451 "EAP-SIM: (encr) AT_NEXT_REAUTH_ID",
452 data->reauth_id,
453 data->reauth_id_len);
454 }
455
456 return 0;
457 }
458
459
eap_sim_client_error(struct eap_sim_data * data,u8 id,int err)460 static struct wpabuf * eap_sim_client_error(struct eap_sim_data *data, u8 id,
461 int err)
462 {
463 struct eap_sim_msg *msg;
464
465 eap_sim_state(data, FAILURE);
466 data->num_id_req = 0;
467 data->num_notification = 0;
468
469 wpa_printf(MSG_DEBUG, "EAP-SIM: Send Client-Error (error code %d)",
470 err);
471 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
472 EAP_SIM_SUBTYPE_CLIENT_ERROR);
473 eap_sim_msg_add(msg, EAP_SIM_AT_CLIENT_ERROR_CODE, err, NULL, 0);
474 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, NULL, NULL, 0);
475 }
476
477
eap_sim_response_start(struct eap_sm * sm,struct eap_sim_data * data,u8 id,enum eap_sim_id_req id_req)478 static struct wpabuf * eap_sim_response_start(struct eap_sm *sm,
479 struct eap_sim_data *data, u8 id,
480 enum eap_sim_id_req id_req)
481 {
482 const u8 *identity = NULL;
483 size_t identity_len = 0;
484 struct eap_sim_msg *msg;
485
486 data->reauth = 0;
487 if (id_req == ANY_ID && data->reauth_id) {
488 identity = data->reauth_id;
489 identity_len = data->reauth_id_len;
490 data->reauth = 1;
491 } else if ((id_req == ANY_ID || id_req == FULLAUTH_ID) &&
492 data->pseudonym) {
493 identity = data->pseudonym;
494 identity_len = data->pseudonym_len;
495 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID);
496 } else if (id_req != NO_ID_REQ) {
497 identity = eap_get_config_identity(sm, &identity_len);
498 if (identity) {
499 eap_sim_clear_identities(sm, data, CLEAR_PSEUDONYM |
500 CLEAR_REAUTH_ID);
501 }
502 }
503 if (id_req != NO_ID_REQ)
504 eap_sim_clear_identities(sm, data, CLEAR_EAP_ID);
505
506 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Start (id=%d)", id);
507 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id,
508 EAP_TYPE_SIM, EAP_SIM_SUBTYPE_START);
509 if (!data->reauth) {
510 wpa_hexdump(MSG_DEBUG, " AT_NONCE_MT",
511 data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
512 eap_sim_msg_add(msg, EAP_SIM_AT_NONCE_MT, 0,
513 data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
514 wpa_printf(MSG_DEBUG, " AT_SELECTED_VERSION %d",
515 data->selected_version);
516 eap_sim_msg_add(msg, EAP_SIM_AT_SELECTED_VERSION,
517 data->selected_version, NULL, 0);
518 }
519
520 if (identity) {
521 wpa_hexdump_ascii(MSG_DEBUG, " AT_IDENTITY",
522 identity, identity_len);
523 eap_sim_msg_add(msg, EAP_SIM_AT_IDENTITY, identity_len,
524 identity, identity_len);
525 }
526
527 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, NULL, NULL, 0);
528 }
529
530
eap_sim_response_challenge(struct eap_sim_data * data,u8 id)531 static struct wpabuf * eap_sim_response_challenge(struct eap_sim_data *data,
532 u8 id)
533 {
534 struct eap_sim_msg *msg;
535
536 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Challenge (id=%d)", id);
537 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
538 EAP_SIM_SUBTYPE_CHALLENGE);
539 if (data->use_result_ind) {
540 wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
541 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
542 }
543 wpa_printf(MSG_DEBUG, " AT_MAC");
544 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
545 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, data->k_aut,
546 (u8 *) data->sres,
547 data->num_chal * EAP_SIM_SRES_LEN);
548 }
549
550
eap_sim_response_reauth(struct eap_sim_data * data,u8 id,int counter_too_small,const u8 * nonce_s)551 static struct wpabuf * eap_sim_response_reauth(struct eap_sim_data *data,
552 u8 id, int counter_too_small,
553 const u8 *nonce_s)
554 {
555 struct eap_sim_msg *msg;
556 unsigned int counter;
557
558 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Reauthentication (id=%d)",
559 id);
560 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
561 EAP_SIM_SUBTYPE_REAUTHENTICATION);
562 wpa_printf(MSG_DEBUG, " AT_IV");
563 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
564 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA);
565
566 if (counter_too_small) {
567 wpa_printf(MSG_DEBUG, " *AT_COUNTER_TOO_SMALL");
568 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER_TOO_SMALL, 0, NULL, 0);
569 counter = data->counter_too_small;
570 } else
571 counter = data->counter;
572
573 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", counter);
574 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0);
575
576 if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) {
577 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt "
578 "AT_ENCR_DATA");
579 eap_sim_msg_free(msg);
580 return NULL;
581 }
582 if (data->use_result_ind) {
583 wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
584 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
585 }
586 wpa_printf(MSG_DEBUG, " AT_MAC");
587 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
588 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, data->k_aut, nonce_s,
589 EAP_SIM_NONCE_S_LEN);
590 }
591
592
eap_sim_response_notification(struct eap_sim_data * data,u8 id,u16 notification)593 static struct wpabuf * eap_sim_response_notification(struct eap_sim_data *data,
594 u8 id, u16 notification)
595 {
596 struct eap_sim_msg *msg;
597 u8 *k_aut = (notification & 0x4000) == 0 ? data->k_aut : NULL;
598
599 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Notification (id=%d)", id);
600 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id,
601 EAP_TYPE_SIM, EAP_SIM_SUBTYPE_NOTIFICATION);
602 if (k_aut && data->reauth) {
603 wpa_printf(MSG_DEBUG, " AT_IV");
604 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
605 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV,
606 EAP_SIM_AT_ENCR_DATA);
607 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", data->counter);
608 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter,
609 NULL, 0);
610 if (eap_sim_msg_add_encr_end(msg, data->k_encr,
611 EAP_SIM_AT_PADDING)) {
612 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt "
613 "AT_ENCR_DATA");
614 eap_sim_msg_free(msg);
615 return NULL;
616 }
617 }
618 if (k_aut) {
619 wpa_printf(MSG_DEBUG, " AT_MAC");
620 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
621 }
622 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, k_aut, (u8 *) "", 0);
623 }
624
625
eap_sim_process_start(struct eap_sm * sm,struct eap_sim_data * data,u8 id,struct eap_sim_attrs * attr)626 static struct wpabuf * eap_sim_process_start(struct eap_sm *sm,
627 struct eap_sim_data *data, u8 id,
628 struct eap_sim_attrs *attr)
629 {
630 int selected_version = -1, id_error;
631 size_t i;
632 u8 *pos;
633
634 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Start");
635 if (attr->version_list == NULL) {
636 wpa_printf(MSG_INFO, "EAP-SIM: No AT_VERSION_LIST in "
637 "SIM/Start");
638 return eap_sim_client_error(data, id,
639 EAP_SIM_UNSUPPORTED_VERSION);
640 }
641
642 os_free(data->ver_list);
643 data->ver_list = os_malloc(attr->version_list_len);
644 if (data->ver_list == NULL) {
645 wpa_printf(MSG_DEBUG, "EAP-SIM: Failed to allocate "
646 "memory for version list");
647 return eap_sim_client_error(data, id,
648 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
649 }
650 os_memcpy(data->ver_list, attr->version_list, attr->version_list_len);
651 data->ver_list_len = attr->version_list_len;
652 pos = data->ver_list;
653 for (i = 0; i < data->ver_list_len / 2; i++) {
654 int ver = pos[0] * 256 + pos[1];
655 pos += 2;
656 if (eap_sim_supported_ver(ver)) {
657 selected_version = ver;
658 break;
659 }
660 }
661 if (selected_version < 0) {
662 wpa_printf(MSG_INFO, "EAP-SIM: Could not find a supported "
663 "version");
664 return eap_sim_client_error(data, id,
665 EAP_SIM_UNSUPPORTED_VERSION);
666 }
667 wpa_printf(MSG_DEBUG, "EAP-SIM: Selected Version %d",
668 selected_version);
669 data->selected_version = selected_version;
670
671 id_error = 0;
672 switch (attr->id_req) {
673 case NO_ID_REQ:
674 break;
675 case ANY_ID:
676 if (data->num_id_req > 0)
677 id_error++;
678 data->num_id_req++;
679 break;
680 case FULLAUTH_ID:
681 if (data->num_id_req > 1)
682 id_error++;
683 data->num_id_req++;
684 break;
685 case PERMANENT_ID:
686 if (data->num_id_req > 2)
687 id_error++;
688 data->num_id_req++;
689 break;
690 }
691 if (id_error) {
692 wpa_printf(MSG_INFO, "EAP-SIM: Too many ID requests "
693 "used within one authentication");
694 return eap_sim_client_error(data, id,
695 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
696 }
697
698 return eap_sim_response_start(sm, data, id, attr->id_req);
699 }
700
701
eap_sim_process_challenge(struct eap_sm * sm,struct eap_sim_data * data,u8 id,const struct wpabuf * reqData,struct eap_sim_attrs * attr)702 static struct wpabuf * eap_sim_process_challenge(struct eap_sm *sm,
703 struct eap_sim_data *data,
704 u8 id,
705 const struct wpabuf *reqData,
706 struct eap_sim_attrs *attr)
707 {
708 const u8 *identity;
709 size_t identity_len;
710 struct eap_sim_attrs eattr;
711 int res;
712
713 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Challenge");
714 data->reauth = 0;
715 if (!attr->mac || !attr->rand) {
716 wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message "
717 "did not include%s%s",
718 !attr->mac ? " AT_MAC" : "",
719 !attr->rand ? " AT_RAND" : "");
720 return eap_sim_client_error(data, id,
721 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
722 }
723
724 wpa_printf(MSG_DEBUG, "EAP-SIM: %lu challenges",
725 (unsigned long) attr->num_chal);
726 if (attr->num_chal < data->min_num_chal) {
727 wpa_printf(MSG_INFO, "EAP-SIM: Insufficient number of "
728 "challenges (%lu)", (unsigned long) attr->num_chal);
729 return eap_sim_client_error(data, id,
730 EAP_SIM_INSUFFICIENT_NUM_OF_CHAL);
731 }
732 if (attr->num_chal > 3) {
733 wpa_printf(MSG_INFO, "EAP-SIM: Too many challenges "
734 "(%lu)", (unsigned long) attr->num_chal);
735 return eap_sim_client_error(data, id,
736 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
737 }
738
739 /* Verify that RANDs are different */
740 if (os_memcmp(attr->rand, attr->rand + GSM_RAND_LEN,
741 GSM_RAND_LEN) == 0 ||
742 (attr->num_chal > 2 &&
743 (os_memcmp(attr->rand, attr->rand + 2 * GSM_RAND_LEN,
744 GSM_RAND_LEN) == 0 ||
745 os_memcmp(attr->rand + GSM_RAND_LEN,
746 attr->rand + 2 * GSM_RAND_LEN,
747 GSM_RAND_LEN) == 0))) {
748 wpa_printf(MSG_INFO, "EAP-SIM: Same RAND used multiple times");
749 return eap_sim_client_error(data, id,
750 EAP_SIM_RAND_NOT_FRESH);
751 }
752
753 os_memcpy(data->rand, attr->rand, attr->num_chal * GSM_RAND_LEN);
754 data->num_chal = attr->num_chal;
755
756 res = eap_sim_gsm_auth(sm, data);
757 if (res > 0) {
758 wpa_printf(MSG_DEBUG, "EAP-SIM: Wait for external SIM processing");
759 return NULL;
760 }
761 if (res) {
762 wpa_printf(MSG_WARNING, "EAP-SIM: GSM authentication failed");
763 return eap_sim_client_error(data, id,
764 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
765 }
766 if (data->last_eap_identity) {
767 identity = data->last_eap_identity;
768 identity_len = data->last_eap_identity_len;
769 } else if (data->pseudonym) {
770 identity = data->pseudonym;
771 identity_len = data->pseudonym_len;
772 } else
773 identity = eap_get_config_identity(sm, &identity_len);
774 wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM: Selected identity for MK "
775 "derivation", identity, identity_len);
776 eap_sim_derive_mk(identity, identity_len, data->nonce_mt,
777 data->selected_version, data->ver_list,
778 data->ver_list_len, data->num_chal,
779 (const u8 *) data->kc, data->mk);
780 eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut, data->msk,
781 data->emsk);
782 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, data->nonce_mt,
783 EAP_SIM_NONCE_MT_LEN)) {
784 wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message "
785 "used invalid AT_MAC");
786 return eap_sim_client_error(data, id,
787 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
788 }
789
790 /* Old reauthentication identity must not be used anymore. In
791 * other words, if no new reauth identity is received, full
792 * authentication will be used on next reauthentication (using
793 * pseudonym identity or permanent identity). */
794 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
795
796 if (attr->encr_data) {
797 u8 *decrypted;
798 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
799 attr->encr_data_len, attr->iv,
800 &eattr, 0);
801 if (decrypted == NULL) {
802 return eap_sim_client_error(
803 data, id, EAP_SIM_UNABLE_TO_PROCESS_PACKET);
804 }
805 eap_sim_learn_ids(sm, data, &eattr);
806 os_free(decrypted);
807 }
808
809 if (data->result_ind && attr->result_ind)
810 data->use_result_ind = 1;
811
812 if (data->state != FAILURE) {
813 eap_sim_state(data, data->use_result_ind ?
814 RESULT_SUCCESS : SUCCESS);
815 }
816
817 data->num_id_req = 0;
818 data->num_notification = 0;
819 /* RFC 4186 specifies that counter is initialized to one after
820 * fullauth, but initializing it to zero makes it easier to implement
821 * reauth verification. */
822 data->counter = 0;
823 return eap_sim_response_challenge(data, id);
824 }
825
826
eap_sim_process_notification_reauth(struct eap_sim_data * data,struct eap_sim_attrs * attr)827 static int eap_sim_process_notification_reauth(struct eap_sim_data *data,
828 struct eap_sim_attrs *attr)
829 {
830 struct eap_sim_attrs eattr;
831 u8 *decrypted;
832
833 if (attr->encr_data == NULL || attr->iv == NULL) {
834 wpa_printf(MSG_WARNING, "EAP-SIM: Notification message after "
835 "reauth did not include encrypted data");
836 return -1;
837 }
838
839 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
840 attr->encr_data_len, attr->iv, &eattr,
841 0);
842 if (decrypted == NULL) {
843 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted "
844 "data from notification message");
845 return -1;
846 }
847
848 if (eattr.counter < 0 || (size_t) eattr.counter != data->counter) {
849 wpa_printf(MSG_WARNING, "EAP-SIM: Counter in notification "
850 "message does not match with counter in reauth "
851 "message");
852 os_free(decrypted);
853 return -1;
854 }
855
856 os_free(decrypted);
857 return 0;
858 }
859
860
eap_sim_process_notification_auth(struct eap_sim_data * data,const struct wpabuf * reqData,struct eap_sim_attrs * attr)861 static int eap_sim_process_notification_auth(struct eap_sim_data *data,
862 const struct wpabuf *reqData,
863 struct eap_sim_attrs *attr)
864 {
865 if (attr->mac == NULL) {
866 wpa_printf(MSG_INFO, "EAP-SIM: no AT_MAC in after_auth "
867 "Notification message");
868 return -1;
869 }
870
871 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
872 {
873 wpa_printf(MSG_WARNING, "EAP-SIM: Notification message "
874 "used invalid AT_MAC");
875 return -1;
876 }
877
878 if (data->reauth &&
879 eap_sim_process_notification_reauth(data, attr)) {
880 wpa_printf(MSG_WARNING, "EAP-SIM: Invalid notification "
881 "message after reauth");
882 return -1;
883 }
884
885 return 0;
886 }
887
888
eap_sim_process_notification(struct eap_sm * sm,struct eap_sim_data * data,u8 id,const struct wpabuf * reqData,struct eap_sim_attrs * attr)889 static struct wpabuf * eap_sim_process_notification(
890 struct eap_sm *sm, struct eap_sim_data *data, u8 id,
891 const struct wpabuf *reqData, struct eap_sim_attrs *attr)
892 {
893 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Notification");
894 if (data->num_notification > 0) {
895 wpa_printf(MSG_INFO, "EAP-SIM: too many notification "
896 "rounds (only one allowed)");
897 return eap_sim_client_error(data, id,
898 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
899 }
900 data->num_notification++;
901 if (attr->notification == -1) {
902 wpa_printf(MSG_INFO, "EAP-SIM: no AT_NOTIFICATION in "
903 "Notification message");
904 return eap_sim_client_error(data, id,
905 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
906 }
907
908 if ((attr->notification & 0x4000) == 0 &&
909 eap_sim_process_notification_auth(data, reqData, attr)) {
910 return eap_sim_client_error(data, id,
911 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
912 }
913
914 eap_sim_report_notification(sm->msg_ctx, attr->notification, 0);
915 if (attr->notification >= 0 && attr->notification < 32768) {
916 eap_sim_state(data, FAILURE);
917 } else if (attr->notification == EAP_SIM_SUCCESS &&
918 data->state == RESULT_SUCCESS)
919 eap_sim_state(data, SUCCESS);
920 return eap_sim_response_notification(data, id, attr->notification);
921 }
922
923
eap_sim_process_reauthentication(struct eap_sm * sm,struct eap_sim_data * data,u8 id,const struct wpabuf * reqData,struct eap_sim_attrs * attr)924 static struct wpabuf * eap_sim_process_reauthentication(
925 struct eap_sm *sm, struct eap_sim_data *data, u8 id,
926 const struct wpabuf *reqData, struct eap_sim_attrs *attr)
927 {
928 struct eap_sim_attrs eattr;
929 u8 *decrypted;
930
931 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Reauthentication");
932
933 if (data->reauth_id == NULL) {
934 wpa_printf(MSG_WARNING, "EAP-SIM: Server is trying "
935 "reauthentication, but no reauth_id available");
936 return eap_sim_client_error(data, id,
937 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
938 }
939
940 data->reauth = 1;
941 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
942 {
943 wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication "
944 "did not have valid AT_MAC");
945 return eap_sim_client_error(data, id,
946 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
947 }
948
949 if (attr->encr_data == NULL || attr->iv == NULL) {
950 wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication "
951 "message did not include encrypted data");
952 return eap_sim_client_error(data, id,
953 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
954 }
955
956 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
957 attr->encr_data_len, attr->iv, &eattr,
958 0);
959 if (decrypted == NULL) {
960 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted "
961 "data from reauthentication message");
962 return eap_sim_client_error(data, id,
963 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
964 }
965
966 if (eattr.nonce_s == NULL || eattr.counter < 0) {
967 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No%s%s in reauth packet",
968 !eattr.nonce_s ? " AT_NONCE_S" : "",
969 eattr.counter < 0 ? " AT_COUNTER" : "");
970 os_free(decrypted);
971 return eap_sim_client_error(data, id,
972 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
973 }
974
975 if (eattr.counter < 0 || (size_t) eattr.counter <= data->counter) {
976 struct wpabuf *res;
977 wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid counter "
978 "(%d <= %d)", eattr.counter, data->counter);
979 data->counter_too_small = eattr.counter;
980
981 /* Reply using Re-auth w/ AT_COUNTER_TOO_SMALL. The current
982 * reauth_id must not be used to start a new reauthentication.
983 * However, since it was used in the last EAP-Response-Identity
984 * packet, it has to saved for the following fullauth to be
985 * used in MK derivation. */
986 os_free(data->last_eap_identity);
987 data->last_eap_identity = data->reauth_id;
988 data->last_eap_identity_len = data->reauth_id_len;
989 data->reauth_id = NULL;
990 data->reauth_id_len = 0;
991
992 res = eap_sim_response_reauth(data, id, 1, eattr.nonce_s);
993 os_free(decrypted);
994
995 return res;
996 }
997 data->counter = eattr.counter;
998
999 os_memcpy(data->nonce_s, eattr.nonce_s, EAP_SIM_NONCE_S_LEN);
1000 wpa_hexdump(MSG_DEBUG, "EAP-SIM: (encr) AT_NONCE_S",
1001 data->nonce_s, EAP_SIM_NONCE_S_LEN);
1002
1003 eap_sim_derive_keys_reauth(data->counter,
1004 data->reauth_id, data->reauth_id_len,
1005 data->nonce_s, data->mk, data->msk,
1006 data->emsk);
1007 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
1008 eap_sim_learn_ids(sm, data, &eattr);
1009
1010 if (data->result_ind && attr->result_ind)
1011 data->use_result_ind = 1;
1012
1013 if (data->state != FAILURE) {
1014 eap_sim_state(data, data->use_result_ind ?
1015 RESULT_SUCCESS : SUCCESS);
1016 }
1017
1018 data->num_id_req = 0;
1019 data->num_notification = 0;
1020 if (data->counter > EAP_SIM_MAX_FAST_REAUTHS) {
1021 wpa_printf(MSG_DEBUG, "EAP-SIM: Maximum number of "
1022 "fast reauths performed - force fullauth");
1023 eap_sim_clear_identities(sm, data,
1024 CLEAR_REAUTH_ID | CLEAR_EAP_ID);
1025 }
1026 os_free(decrypted);
1027 return eap_sim_response_reauth(data, id, 0, data->nonce_s);
1028 }
1029
1030
eap_sim_process(struct eap_sm * sm,void * priv,struct eap_method_ret * ret,const struct wpabuf * reqData)1031 static struct wpabuf * eap_sim_process(struct eap_sm *sm, void *priv,
1032 struct eap_method_ret *ret,
1033 const struct wpabuf *reqData)
1034 {
1035 struct eap_sim_data *data = priv;
1036 const struct eap_hdr *req;
1037 u8 subtype, id;
1038 struct wpabuf *res;
1039 const u8 *pos;
1040 struct eap_sim_attrs attr;
1041 size_t len;
1042
1043 wpa_hexdump_buf(MSG_DEBUG, "EAP-SIM: EAP data", reqData);
1044 if (eap_get_config_identity(sm, &len) == NULL) {
1045 wpa_printf(MSG_INFO, "EAP-SIM: Identity not configured");
1046 eap_sm_request_identity(sm);
1047 ret->ignore = TRUE;
1048 return NULL;
1049 }
1050
1051 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_SIM, reqData, &len);
1052 if (pos == NULL || len < 3) {
1053 ret->ignore = TRUE;
1054 return NULL;
1055 }
1056 req = wpabuf_head(reqData);
1057 id = req->identifier;
1058 len = be_to_host16(req->length);
1059
1060 ret->ignore = FALSE;
1061 ret->methodState = METHOD_MAY_CONT;
1062 ret->decision = DECISION_FAIL;
1063 ret->allowNotifications = TRUE;
1064
1065 subtype = *pos++;
1066 wpa_printf(MSG_DEBUG, "EAP-SIM: Subtype=%d", subtype);
1067 pos += 2; /* Reserved */
1068
1069 if (eap_sim_parse_attr(pos, wpabuf_head_u8(reqData) + len, &attr, 0,
1070 0)) {
1071 res = eap_sim_client_error(data, id,
1072 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1073 goto done;
1074 }
1075
1076 switch (subtype) {
1077 case EAP_SIM_SUBTYPE_START:
1078 res = eap_sim_process_start(sm, data, id, &attr);
1079 break;
1080 case EAP_SIM_SUBTYPE_CHALLENGE:
1081 res = eap_sim_process_challenge(sm, data, id, reqData, &attr);
1082 break;
1083 case EAP_SIM_SUBTYPE_NOTIFICATION:
1084 res = eap_sim_process_notification(sm, data, id, reqData,
1085 &attr);
1086 break;
1087 case EAP_SIM_SUBTYPE_REAUTHENTICATION:
1088 res = eap_sim_process_reauthentication(sm, data, id, reqData,
1089 &attr);
1090 break;
1091 case EAP_SIM_SUBTYPE_CLIENT_ERROR:
1092 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Client-Error");
1093 res = eap_sim_client_error(data, id,
1094 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1095 break;
1096 default:
1097 wpa_printf(MSG_DEBUG, "EAP-SIM: Unknown subtype=%d", subtype);
1098 res = eap_sim_client_error(data, id,
1099 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1100 break;
1101 }
1102
1103 done:
1104 if (data->state == FAILURE) {
1105 ret->decision = DECISION_FAIL;
1106 ret->methodState = METHOD_DONE;
1107 } else if (data->state == SUCCESS) {
1108 ret->decision = data->use_result_ind ?
1109 DECISION_UNCOND_SUCC : DECISION_COND_SUCC;
1110 ret->methodState = data->use_result_ind ?
1111 METHOD_DONE : METHOD_MAY_CONT;
1112 } else if (data->state == RESULT_SUCCESS)
1113 ret->methodState = METHOD_CONT;
1114
1115 if (ret->methodState == METHOD_DONE) {
1116 ret->allowNotifications = FALSE;
1117 }
1118
1119 return res;
1120 }
1121
1122
eap_sim_has_reauth_data(struct eap_sm * sm,void * priv)1123 static Boolean eap_sim_has_reauth_data(struct eap_sm *sm, void *priv)
1124 {
1125 struct eap_sim_data *data = priv;
1126 return data->pseudonym || data->reauth_id;
1127 }
1128
1129
eap_sim_deinit_for_reauth(struct eap_sm * sm,void * priv)1130 static void eap_sim_deinit_for_reauth(struct eap_sm *sm, void *priv)
1131 {
1132 struct eap_sim_data *data = priv;
1133 eap_sim_clear_identities(sm, data, CLEAR_EAP_ID);
1134 data->use_result_ind = 0;
1135 eap_sim_clear_keys(data, 1);
1136 }
1137
1138
eap_sim_init_for_reauth(struct eap_sm * sm,void * priv)1139 static void * eap_sim_init_for_reauth(struct eap_sm *sm, void *priv)
1140 {
1141 struct eap_sim_data *data = priv;
1142 if (random_get_bytes(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) {
1143 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data "
1144 "for NONCE_MT");
1145 eap_sim_deinit(sm, data);
1146 return NULL;
1147 }
1148 data->num_id_req = 0;
1149 data->num_notification = 0;
1150 eap_sim_state(data, CONTINUE);
1151 return priv;
1152 }
1153
1154
eap_sim_get_identity(struct eap_sm * sm,void * priv,size_t * len)1155 static const u8 * eap_sim_get_identity(struct eap_sm *sm, void *priv,
1156 size_t *len)
1157 {
1158 struct eap_sim_data *data = priv;
1159
1160 if (data->reauth_id) {
1161 *len = data->reauth_id_len;
1162 return data->reauth_id;
1163 }
1164
1165 if (data->pseudonym) {
1166 *len = data->pseudonym_len;
1167 return data->pseudonym;
1168 }
1169
1170 return NULL;
1171 }
1172
1173
eap_sim_isKeyAvailable(struct eap_sm * sm,void * priv)1174 static Boolean eap_sim_isKeyAvailable(struct eap_sm *sm, void *priv)
1175 {
1176 struct eap_sim_data *data = priv;
1177 return data->state == SUCCESS;
1178 }
1179
1180
eap_sim_getKey(struct eap_sm * sm,void * priv,size_t * len)1181 static u8 * eap_sim_getKey(struct eap_sm *sm, void *priv, size_t *len)
1182 {
1183 struct eap_sim_data *data = priv;
1184 u8 *key;
1185
1186 if (data->state != SUCCESS)
1187 return NULL;
1188
1189 key = os_malloc(EAP_SIM_KEYING_DATA_LEN);
1190 if (key == NULL)
1191 return NULL;
1192
1193 *len = EAP_SIM_KEYING_DATA_LEN;
1194 os_memcpy(key, data->msk, EAP_SIM_KEYING_DATA_LEN);
1195
1196 return key;
1197 }
1198
1199
eap_sim_get_session_id(struct eap_sm * sm,void * priv,size_t * len)1200 static u8 * eap_sim_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1201 {
1202 struct eap_sim_data *data = priv;
1203 u8 *id;
1204
1205 if (data->state != SUCCESS)
1206 return NULL;
1207
1208 *len = 1 + data->num_chal * GSM_RAND_LEN + EAP_SIM_NONCE_MT_LEN;
1209 id = os_malloc(*len);
1210 if (id == NULL)
1211 return NULL;
1212
1213 id[0] = EAP_TYPE_SIM;
1214 os_memcpy(id + 1, data->rand, data->num_chal * GSM_RAND_LEN);
1215 os_memcpy(id + 1 + data->num_chal * GSM_RAND_LEN, data->nonce_mt,
1216 EAP_SIM_NONCE_MT_LEN);
1217 wpa_hexdump(MSG_DEBUG, "EAP-SIM: Derived Session-Id", id, *len);
1218
1219 return id;
1220 }
1221
1222
eap_sim_get_emsk(struct eap_sm * sm,void * priv,size_t * len)1223 static u8 * eap_sim_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1224 {
1225 struct eap_sim_data *data = priv;
1226 u8 *key;
1227
1228 if (data->state != SUCCESS)
1229 return NULL;
1230
1231 key = os_malloc(EAP_EMSK_LEN);
1232 if (key == NULL)
1233 return NULL;
1234
1235 *len = EAP_EMSK_LEN;
1236 os_memcpy(key, data->emsk, EAP_EMSK_LEN);
1237
1238 return key;
1239 }
1240
1241
eap_peer_sim_register(void)1242 int eap_peer_sim_register(void)
1243 {
1244 struct eap_method *eap;
1245
1246 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1247 EAP_VENDOR_IETF, EAP_TYPE_SIM, "SIM");
1248 if (eap == NULL)
1249 return -1;
1250
1251 eap->init = eap_sim_init;
1252 eap->deinit = eap_sim_deinit;
1253 eap->process = eap_sim_process;
1254 eap->isKeyAvailable = eap_sim_isKeyAvailable;
1255 eap->getKey = eap_sim_getKey;
1256 eap->getSessionId = eap_sim_get_session_id;
1257 eap->has_reauth_data = eap_sim_has_reauth_data;
1258 eap->deinit_for_reauth = eap_sim_deinit_for_reauth;
1259 eap->init_for_reauth = eap_sim_init_for_reauth;
1260 eap->get_identity = eap_sim_get_identity;
1261 eap->get_emsk = eap_sim_get_emsk;
1262
1263 return eap_peer_method_register(eap);
1264 }
1265