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 u8 reauth_mac[EAP_SIM_MAC_LEN];
36
37 int num_id_req, num_notification;
38 u8 *pseudonym;
39 size_t pseudonym_len;
40 u8 *reauth_id;
41 size_t reauth_id_len;
42 int reauth;
43 unsigned int counter, counter_too_small;
44 u8 *last_eap_identity;
45 size_t last_eap_identity_len;
46 enum {
47 CONTINUE, RESULT_SUCCESS, SUCCESS, FAILURE
48 } state;
49 int result_ind, use_result_ind;
50 int use_pseudonym;
51 int error_code;
52 };
53
54
55 #ifndef CONFIG_NO_STDOUT_DEBUG
eap_sim_state_txt(int state)56 static const char * eap_sim_state_txt(int state)
57 {
58 switch (state) {
59 case CONTINUE:
60 return "CONTINUE";
61 case RESULT_SUCCESS:
62 return "RESULT_SUCCESS";
63 case SUCCESS:
64 return "SUCCESS";
65 case FAILURE:
66 return "FAILURE";
67 default:
68 return "?";
69 }
70 }
71 #endif /* CONFIG_NO_STDOUT_DEBUG */
72
73
eap_sim_state(struct eap_sim_data * data,int state)74 static void eap_sim_state(struct eap_sim_data *data, int state)
75 {
76 wpa_printf(MSG_DEBUG, "EAP-SIM: %s -> %s",
77 eap_sim_state_txt(data->state),
78 eap_sim_state_txt(state));
79 data->state = state;
80 }
81
82
eap_sim_init(struct eap_sm * sm)83 static void * eap_sim_init(struct eap_sm *sm)
84 {
85 struct eap_sim_data *data;
86 struct eap_peer_config *config = eap_get_config(sm);
87
88 data = os_zalloc(sizeof(*data));
89 if (data == NULL)
90 return NULL;
91
92 if (random_get_bytes(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) {
93 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data "
94 "for NONCE_MT");
95 os_free(data);
96 return NULL;
97 }
98
99 /* Zero is a valid error code, so we need to initialize */
100 data->error_code = NO_EAP_METHOD_ERROR;
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 data->use_pseudonym = !sm->init_phase2;
125 if (config && config->anonymous_identity && data->use_pseudonym) {
126 data->pseudonym = os_malloc(config->anonymous_identity_len);
127 if (data->pseudonym) {
128 os_memcpy(data->pseudonym, config->anonymous_identity,
129 config->anonymous_identity_len);
130 data->pseudonym_len = config->anonymous_identity_len;
131 }
132 }
133
134 eap_sim_state(data, CONTINUE);
135
136 return data;
137 }
138
139
eap_sim_clear_keys(struct eap_sim_data * data,int reauth)140 static void eap_sim_clear_keys(struct eap_sim_data *data, int reauth)
141 {
142 if (!reauth) {
143 os_memset(data->mk, 0, EAP_SIM_MK_LEN);
144 os_memset(data->k_aut, 0, EAP_SIM_K_AUT_LEN);
145 os_memset(data->k_encr, 0, EAP_SIM_K_ENCR_LEN);
146 }
147 os_memset(data->kc, 0, 3 * EAP_SIM_KC_LEN);
148 os_memset(data->sres, 0, 3 * EAP_SIM_SRES_LEN);
149 os_memset(data->msk, 0, EAP_SIM_KEYING_DATA_LEN);
150 os_memset(data->emsk, 0, EAP_EMSK_LEN);
151 }
152
153
eap_sim_deinit(struct eap_sm * sm,void * priv)154 static void eap_sim_deinit(struct eap_sm *sm, void *priv)
155 {
156 struct eap_sim_data *data = priv;
157 if (data) {
158 os_free(data->ver_list);
159 os_free(data->pseudonym);
160 os_free(data->reauth_id);
161 os_free(data->last_eap_identity);
162 eap_sim_clear_keys(data, 0);
163 os_free(data);
164 }
165 }
166
167
eap_sim_ext_sim_req(struct eap_sm * sm,struct eap_sim_data * data)168 static int eap_sim_ext_sim_req(struct eap_sm *sm, struct eap_sim_data *data)
169 {
170 char req[200], *pos, *end;
171 size_t i;
172
173 wpa_printf(MSG_DEBUG, "EAP-SIM: Use external SIM processing");
174 pos = req;
175 end = pos + sizeof(req);
176 pos += os_snprintf(pos, end - pos, "GSM-AUTH");
177 for (i = 0; i < data->num_chal; i++) {
178 pos += os_snprintf(pos, end - pos, ":");
179 pos += wpa_snprintf_hex(pos, end - pos, data->rand[i],
180 GSM_RAND_LEN);
181 }
182
183 eap_sm_request_sim(sm, req);
184 return 1;
185 }
186
187
eap_sim_ext_sim_result(struct eap_sm * sm,struct eap_sim_data * data,struct eap_peer_config * conf)188 static int eap_sim_ext_sim_result(struct eap_sm *sm, struct eap_sim_data *data,
189 struct eap_peer_config *conf)
190 {
191 char *resp, *pos;
192 size_t i;
193
194 wpa_printf(MSG_DEBUG,
195 "EAP-SIM: Use result from external SIM processing");
196
197 resp = conf->external_sim_resp;
198 conf->external_sim_resp = NULL;
199
200 if (os_strncmp(resp, "GSM-AUTH:", 9) != 0) {
201 wpa_printf(MSG_DEBUG, "EAP-SIM: Unrecognized external SIM processing response");
202 os_free(resp);
203 return -1;
204 }
205
206 pos = resp + 9;
207 for (i = 0; i < data->num_chal; i++) {
208 wpa_hexdump(MSG_DEBUG, "EAP-SIM: RAND",
209 data->rand[i], GSM_RAND_LEN);
210
211 if (hexstr2bin(pos, data->kc[i], EAP_SIM_KC_LEN) < 0)
212 goto invalid;
213 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: Kc",
214 data->kc[i], EAP_SIM_KC_LEN);
215 pos += EAP_SIM_KC_LEN * 2;
216 if (*pos != ':')
217 goto invalid;
218 pos++;
219
220 if (hexstr2bin(pos, data->sres[i], EAP_SIM_SRES_LEN) < 0)
221 goto invalid;
222 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: SRES",
223 data->sres[i], EAP_SIM_SRES_LEN);
224 pos += EAP_SIM_SRES_LEN * 2;
225 if (i + 1 < data->num_chal) {
226 if (*pos != ':')
227 goto invalid;
228 pos++;
229 }
230 }
231
232 os_free(resp);
233 return 0;
234
235 invalid:
236 wpa_printf(MSG_DEBUG, "EAP-SIM: Invalid external SIM processing GSM-AUTH response");
237 os_free(resp);
238 return -1;
239 }
240
241
eap_sim_gsm_auth(struct eap_sm * sm,struct eap_sim_data * data)242 static int eap_sim_gsm_auth(struct eap_sm *sm, struct eap_sim_data *data)
243 {
244 struct eap_peer_config *conf;
245
246 wpa_printf(MSG_DEBUG, "EAP-SIM: GSM authentication algorithm");
247
248 conf = eap_get_config(sm);
249 if (conf == NULL)
250 return -1;
251
252 if (sm->external_sim) {
253 if (conf->external_sim_resp)
254 return eap_sim_ext_sim_result(sm, data, conf);
255 else
256 return eap_sim_ext_sim_req(sm, data);
257 }
258
259 #ifdef PCSC_FUNCS
260 if (conf->pcsc) {
261 if (scard_gsm_auth(sm->scard_ctx, data->rand[0],
262 data->sres[0], data->kc[0]) ||
263 scard_gsm_auth(sm->scard_ctx, data->rand[1],
264 data->sres[1], data->kc[1]) ||
265 (data->num_chal > 2 &&
266 scard_gsm_auth(sm->scard_ctx, data->rand[2],
267 data->sres[2], data->kc[2]))) {
268 wpa_printf(MSG_DEBUG, "EAP-SIM: GSM SIM "
269 "authentication could not be completed");
270 return -1;
271 }
272 return 0;
273 }
274 #endif /* PCSC_FUNCS */
275
276 #ifdef CONFIG_SIM_SIMULATOR
277 if (conf->password) {
278 u8 opc[16], k[16];
279 const char *pos;
280 size_t i;
281 wpa_printf(MSG_DEBUG, "EAP-SIM: Use internal GSM-Milenage "
282 "implementation for authentication");
283 if (conf->password_len < 65) {
284 wpa_printf(MSG_DEBUG, "EAP-SIM: invalid GSM-Milenage "
285 "password");
286 return -1;
287 }
288 pos = (const char *) conf->password;
289 if (hexstr2bin(pos, k, 16))
290 return -1;
291 pos += 32;
292 if (*pos != ':')
293 return -1;
294 pos++;
295
296 if (hexstr2bin(pos, opc, 16))
297 return -1;
298
299 for (i = 0; i < data->num_chal; i++) {
300 if (gsm_milenage(opc, k, data->rand[i],
301 data->sres[i], data->kc[i])) {
302 wpa_printf(MSG_DEBUG, "EAP-SIM: "
303 "GSM-Milenage authentication "
304 "could not be completed");
305 return -1;
306 }
307 wpa_hexdump(MSG_DEBUG, "EAP-SIM: RAND",
308 data->rand[i], GSM_RAND_LEN);
309 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: SRES",
310 data->sres[i], EAP_SIM_SRES_LEN);
311 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: Kc",
312 data->kc[i], EAP_SIM_KC_LEN);
313 }
314 return 0;
315 }
316 #endif /* CONFIG_SIM_SIMULATOR */
317
318 #ifdef CONFIG_SIM_HARDCODED
319 /* These hardcoded Kc and SRES values are used for testing. RAND to
320 * KC/SREC mapping is very bogus as far as real authentication is
321 * concerned, but it is quite useful for cases where the AS is rotating
322 * the order of pre-configured values. */
323 {
324 size_t i;
325
326 wpa_printf(MSG_DEBUG, "EAP-SIM: Use hardcoded Kc and SRES "
327 "values for testing");
328
329 for (i = 0; i < data->num_chal; i++) {
330 if (data->rand[i][0] == 0xaa) {
331 os_memcpy(data->kc[i],
332 "\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7",
333 EAP_SIM_KC_LEN);
334 os_memcpy(data->sres[i], "\xd1\xd2\xd3\xd4",
335 EAP_SIM_SRES_LEN);
336 } else if (data->rand[i][0] == 0xbb) {
337 os_memcpy(data->kc[i],
338 "\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7",
339 EAP_SIM_KC_LEN);
340 os_memcpy(data->sres[i], "\xe1\xe2\xe3\xe4",
341 EAP_SIM_SRES_LEN);
342 } else {
343 os_memcpy(data->kc[i],
344 "\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7",
345 EAP_SIM_KC_LEN);
346 os_memcpy(data->sres[i], "\xf1\xf2\xf3\xf4",
347 EAP_SIM_SRES_LEN);
348 }
349 }
350 }
351
352 return 0;
353
354 #else /* CONFIG_SIM_HARDCODED */
355
356 wpa_printf(MSG_DEBUG, "EAP-SIM: No GSM authentication algorithm "
357 "enabled");
358 return -1;
359
360 #endif /* CONFIG_SIM_HARDCODED */
361 }
362
363
eap_sim_supported_ver(int version)364 static int eap_sim_supported_ver(int version)
365 {
366 return version == EAP_SIM_VERSION;
367 }
368
369
370 #define CLEAR_PSEUDONYM 0x01
371 #define CLEAR_REAUTH_ID 0x02
372 #define CLEAR_EAP_ID 0x04
373
eap_sim_clear_identities(struct eap_sm * sm,struct eap_sim_data * data,int id)374 static void eap_sim_clear_identities(struct eap_sm *sm,
375 struct eap_sim_data *data, int id)
376 {
377 if ((id & CLEAR_PSEUDONYM) && data->pseudonym) {
378 wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old pseudonym");
379 os_free(data->pseudonym);
380 data->pseudonym = NULL;
381 data->pseudonym_len = 0;
382 if (data->use_pseudonym)
383 eap_set_anon_id(sm, NULL, 0);
384 }
385 if ((id & CLEAR_REAUTH_ID) && data->reauth_id) {
386 wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old reauth_id");
387 os_free(data->reauth_id);
388 data->reauth_id = NULL;
389 data->reauth_id_len = 0;
390 }
391 if ((id & CLEAR_EAP_ID) && data->last_eap_identity) {
392 wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old eap_id");
393 os_free(data->last_eap_identity);
394 data->last_eap_identity = NULL;
395 data->last_eap_identity_len = 0;
396 }
397 }
398
399
eap_sim_learn_ids(struct eap_sm * sm,struct eap_sim_data * data,struct eap_sim_attrs * attr)400 static int eap_sim_learn_ids(struct eap_sm *sm, struct eap_sim_data *data,
401 struct eap_sim_attrs *attr)
402 {
403 if (attr->next_pseudonym) {
404 const u8 *identity = NULL;
405 size_t identity_len = 0;
406 const u8 *realm = NULL;
407 size_t realm_len = 0;
408
409 wpa_hexdump_ascii(MSG_DEBUG,
410 "EAP-SIM: (encr) AT_NEXT_PSEUDONYM",
411 attr->next_pseudonym,
412 attr->next_pseudonym_len);
413 os_free(data->pseudonym);
414 /* Look for the realm of the permanent identity */
415 identity = eap_get_config_identity(sm, &identity_len);
416 if (identity) {
417 for (realm = identity, realm_len = identity_len;
418 realm_len > 0; realm_len--, realm++) {
419 if (*realm == '@')
420 break;
421 }
422 }
423 data->pseudonym = os_malloc(attr->next_pseudonym_len +
424 realm_len);
425 if (data->pseudonym == NULL) {
426 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No memory for "
427 "next pseudonym");
428 data->pseudonym_len = 0;
429 return -1;
430 }
431 os_memcpy(data->pseudonym, attr->next_pseudonym,
432 attr->next_pseudonym_len);
433 if (realm_len) {
434 os_memcpy(data->pseudonym + attr->next_pseudonym_len,
435 realm, realm_len);
436 }
437 data->pseudonym_len = attr->next_pseudonym_len + realm_len;
438 if (data->use_pseudonym)
439 eap_set_anon_id(sm, data->pseudonym,
440 data->pseudonym_len);
441 }
442
443 if (attr->next_reauth_id) {
444 os_free(data->reauth_id);
445 data->reauth_id = os_memdup(attr->next_reauth_id,
446 attr->next_reauth_id_len);
447 if (data->reauth_id == NULL) {
448 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No memory for "
449 "next reauth_id");
450 data->reauth_id_len = 0;
451 return -1;
452 }
453 data->reauth_id_len = attr->next_reauth_id_len;
454 wpa_hexdump_ascii(MSG_DEBUG,
455 "EAP-SIM: (encr) AT_NEXT_REAUTH_ID",
456 data->reauth_id,
457 data->reauth_id_len);
458 }
459
460 return 0;
461 }
462
463
eap_sim_client_error(struct eap_sim_data * data,u8 id,int err)464 static struct wpabuf * eap_sim_client_error(struct eap_sim_data *data, u8 id,
465 int err)
466 {
467 struct eap_sim_msg *msg;
468
469 eap_sim_state(data, FAILURE);
470 data->num_id_req = 0;
471 data->num_notification = 0;
472
473 wpa_printf(MSG_DEBUG, "EAP-SIM: Send Client-Error (error code %d)",
474 err);
475 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
476 EAP_SIM_SUBTYPE_CLIENT_ERROR);
477 eap_sim_msg_add(msg, EAP_SIM_AT_CLIENT_ERROR_CODE, err, NULL, 0);
478 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, NULL, NULL, 0);
479 }
480
481
eap_sim_response_start(struct eap_sm * sm,struct eap_sim_data * data,u8 id,enum eap_sim_id_req id_req)482 static struct wpabuf * eap_sim_response_start(struct eap_sm *sm,
483 struct eap_sim_data *data, u8 id,
484 enum eap_sim_id_req id_req)
485 {
486 const u8 *identity = NULL;
487 size_t identity_len = 0;
488 struct eap_sim_msg *msg;
489
490 data->reauth = 0;
491 if (id_req == ANY_ID && data->reauth_id) {
492 identity = data->reauth_id;
493 identity_len = data->reauth_id_len;
494 data->reauth = 1;
495 } else if ((id_req == ANY_ID || id_req == FULLAUTH_ID) &&
496 data->pseudonym &&
497 !eap_sim_anonymous_username(data->pseudonym,
498 data->pseudonym_len)) {
499 identity = data->pseudonym;
500 identity_len = data->pseudonym_len;
501 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID);
502 } else if (id_req != NO_ID_REQ) {
503 identity = eap_get_config_identity(sm, &identity_len);
504 if (identity) {
505 int ids = CLEAR_PSEUDONYM | CLEAR_REAUTH_ID;
506
507 if (data->pseudonym &&
508 eap_sim_anonymous_username(data->pseudonym,
509 data->pseudonym_len))
510 ids &= ~CLEAR_PSEUDONYM;
511 eap_sim_clear_identities(sm, data, ids);
512 }
513 }
514 if (id_req != NO_ID_REQ)
515 eap_sim_clear_identities(sm, data, CLEAR_EAP_ID);
516
517 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Start (id=%d)", id);
518 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id,
519 EAP_TYPE_SIM, EAP_SIM_SUBTYPE_START);
520 if (!data->reauth) {
521 wpa_hexdump(MSG_DEBUG, " AT_NONCE_MT",
522 data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
523 eap_sim_msg_add(msg, EAP_SIM_AT_NONCE_MT, 0,
524 data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
525 wpa_printf(MSG_DEBUG, " AT_SELECTED_VERSION %d",
526 data->selected_version);
527 eap_sim_msg_add(msg, EAP_SIM_AT_SELECTED_VERSION,
528 data->selected_version, NULL, 0);
529 }
530
531 if (identity) {
532 wpa_hexdump_ascii(MSG_DEBUG, " AT_IDENTITY",
533 identity, identity_len);
534 eap_sim_msg_add(msg, EAP_SIM_AT_IDENTITY, identity_len,
535 identity, identity_len);
536 }
537
538 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, NULL, NULL, 0);
539 }
540
541
eap_sim_response_challenge(struct eap_sim_data * data,u8 id)542 static struct wpabuf * eap_sim_response_challenge(struct eap_sim_data *data,
543 u8 id)
544 {
545 struct eap_sim_msg *msg;
546
547 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Challenge (id=%d)", id);
548 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
549 EAP_SIM_SUBTYPE_CHALLENGE);
550 if (data->use_result_ind) {
551 wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
552 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
553 }
554 wpa_printf(MSG_DEBUG, " AT_MAC");
555 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
556 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, data->k_aut,
557 (u8 *) data->sres,
558 data->num_chal * EAP_SIM_SRES_LEN);
559 }
560
561
eap_sim_response_reauth(struct eap_sim_data * data,u8 id,int counter_too_small,const u8 * nonce_s)562 static struct wpabuf * eap_sim_response_reauth(struct eap_sim_data *data,
563 u8 id, int counter_too_small,
564 const u8 *nonce_s)
565 {
566 struct eap_sim_msg *msg;
567 unsigned int counter;
568
569 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Reauthentication (id=%d)",
570 id);
571 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
572 EAP_SIM_SUBTYPE_REAUTHENTICATION);
573 wpa_printf(MSG_DEBUG, " AT_IV");
574 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
575 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA);
576
577 if (counter_too_small) {
578 wpa_printf(MSG_DEBUG, " *AT_COUNTER_TOO_SMALL");
579 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER_TOO_SMALL, 0, NULL, 0);
580 counter = data->counter_too_small;
581 } else
582 counter = data->counter;
583
584 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", counter);
585 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0);
586
587 if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) {
588 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt "
589 "AT_ENCR_DATA");
590 eap_sim_msg_free(msg);
591 return NULL;
592 }
593 if (data->use_result_ind) {
594 wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
595 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
596 }
597 wpa_printf(MSG_DEBUG, " AT_MAC");
598 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
599 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, data->k_aut, nonce_s,
600 EAP_SIM_NONCE_S_LEN);
601 }
602
603
eap_sim_response_notification(struct eap_sim_data * data,u8 id,u16 notification)604 static struct wpabuf * eap_sim_response_notification(struct eap_sim_data *data,
605 u8 id, u16 notification)
606 {
607 struct eap_sim_msg *msg;
608 u8 *k_aut = (notification & 0x4000) == 0 ? data->k_aut : NULL;
609
610 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Notification (id=%d)", id);
611 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id,
612 EAP_TYPE_SIM, EAP_SIM_SUBTYPE_NOTIFICATION);
613 if (k_aut && data->reauth) {
614 wpa_printf(MSG_DEBUG, " AT_IV");
615 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
616 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV,
617 EAP_SIM_AT_ENCR_DATA);
618 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", data->counter);
619 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter,
620 NULL, 0);
621 if (eap_sim_msg_add_encr_end(msg, data->k_encr,
622 EAP_SIM_AT_PADDING)) {
623 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt "
624 "AT_ENCR_DATA");
625 eap_sim_msg_free(msg);
626 return NULL;
627 }
628 }
629 if (k_aut) {
630 wpa_printf(MSG_DEBUG, " AT_MAC");
631 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
632 }
633 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, k_aut, (u8 *) "", 0);
634 }
635
636
eap_sim_process_start(struct eap_sm * sm,struct eap_sim_data * data,u8 id,struct eap_sim_attrs * attr)637 static struct wpabuf * eap_sim_process_start(struct eap_sm *sm,
638 struct eap_sim_data *data, u8 id,
639 struct eap_sim_attrs *attr)
640 {
641 int selected_version = -1, id_error;
642 size_t i;
643 u8 *pos;
644
645 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Start");
646 if (attr->version_list == NULL) {
647 wpa_printf(MSG_INFO, "EAP-SIM: No AT_VERSION_LIST in "
648 "SIM/Start");
649 return eap_sim_client_error(data, id,
650 EAP_SIM_UNSUPPORTED_VERSION);
651 }
652
653 os_free(data->ver_list);
654 data->ver_list = os_memdup(attr->version_list, attr->version_list_len);
655 if (data->ver_list == NULL) {
656 wpa_printf(MSG_DEBUG, "EAP-SIM: Failed to allocate "
657 "memory for version list");
658 return eap_sim_client_error(data, id,
659 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
660 }
661 data->ver_list_len = attr->version_list_len;
662 pos = data->ver_list;
663 for (i = 0; i < data->ver_list_len / 2; i++) {
664 int ver = pos[0] * 256 + pos[1];
665 pos += 2;
666 if (eap_sim_supported_ver(ver)) {
667 selected_version = ver;
668 break;
669 }
670 }
671 if (selected_version < 0) {
672 wpa_printf(MSG_INFO, "EAP-SIM: Could not find a supported "
673 "version");
674 return eap_sim_client_error(data, id,
675 EAP_SIM_UNSUPPORTED_VERSION);
676 }
677 wpa_printf(MSG_DEBUG, "EAP-SIM: Selected Version %d",
678 selected_version);
679 data->selected_version = selected_version;
680
681 id_error = 0;
682 switch (attr->id_req) {
683 case NO_ID_REQ:
684 break;
685 case ANY_ID:
686 if (data->num_id_req > 0)
687 id_error++;
688 data->num_id_req++;
689 break;
690 case FULLAUTH_ID:
691 if (data->num_id_req > 1)
692 id_error++;
693 data->num_id_req++;
694 break;
695 case PERMANENT_ID:
696 if (data->num_id_req > 2)
697 id_error++;
698 data->num_id_req++;
699 break;
700 }
701 if (id_error) {
702 wpa_printf(MSG_INFO, "EAP-SIM: Too many ID requests "
703 "used within one authentication");
704 return eap_sim_client_error(data, id,
705 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
706 }
707
708 return eap_sim_response_start(sm, data, id, attr->id_req);
709 }
710
711
eap_sim_process_challenge(struct eap_sm * sm,struct eap_sim_data * data,u8 id,const struct wpabuf * reqData,struct eap_sim_attrs * attr)712 static struct wpabuf * eap_sim_process_challenge(struct eap_sm *sm,
713 struct eap_sim_data *data,
714 u8 id,
715 const struct wpabuf *reqData,
716 struct eap_sim_attrs *attr)
717 {
718 const u8 *identity;
719 size_t identity_len;
720 struct eap_sim_attrs eattr;
721 int res;
722
723 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Challenge");
724 data->reauth = 0;
725 if (!attr->mac || !attr->rand) {
726 wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message "
727 "did not include%s%s",
728 !attr->mac ? " AT_MAC" : "",
729 !attr->rand ? " AT_RAND" : "");
730 return eap_sim_client_error(data, id,
731 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
732 }
733
734 wpa_printf(MSG_DEBUG, "EAP-SIM: %lu challenges",
735 (unsigned long) attr->num_chal);
736 if (attr->num_chal < data->min_num_chal) {
737 wpa_printf(MSG_INFO, "EAP-SIM: Insufficient number of "
738 "challenges (%lu)", (unsigned long) attr->num_chal);
739 return eap_sim_client_error(data, id,
740 EAP_SIM_INSUFFICIENT_NUM_OF_CHAL);
741 }
742 if (attr->num_chal > 3) {
743 wpa_printf(MSG_INFO, "EAP-SIM: Too many challenges "
744 "(%lu)", (unsigned long) attr->num_chal);
745 return eap_sim_client_error(data, id,
746 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
747 }
748
749 /* Verify that RANDs are different */
750 if (os_memcmp(attr->rand, attr->rand + GSM_RAND_LEN,
751 GSM_RAND_LEN) == 0 ||
752 (attr->num_chal > 2 &&
753 (os_memcmp(attr->rand, attr->rand + 2 * GSM_RAND_LEN,
754 GSM_RAND_LEN) == 0 ||
755 os_memcmp(attr->rand + GSM_RAND_LEN,
756 attr->rand + 2 * GSM_RAND_LEN,
757 GSM_RAND_LEN) == 0))) {
758 wpa_printf(MSG_INFO, "EAP-SIM: Same RAND used multiple times");
759 return eap_sim_client_error(data, id,
760 EAP_SIM_RAND_NOT_FRESH);
761 }
762
763 os_memcpy(data->rand, attr->rand, attr->num_chal * GSM_RAND_LEN);
764 data->num_chal = attr->num_chal;
765
766 res = eap_sim_gsm_auth(sm, data);
767 if (res > 0) {
768 wpa_printf(MSG_DEBUG, "EAP-SIM: Wait for external SIM processing");
769 return NULL;
770 }
771 if (res) {
772 wpa_printf(MSG_WARNING, "EAP-SIM: GSM authentication failed");
773 return eap_sim_client_error(data, id,
774 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
775 }
776 if (data->last_eap_identity) {
777 identity = data->last_eap_identity;
778 identity_len = data->last_eap_identity_len;
779 } else if (data->pseudonym &&
780 !eap_sim_anonymous_username(data->pseudonym,
781 data->pseudonym_len)) {
782 identity = data->pseudonym;
783 identity_len = data->pseudonym_len;
784 } else {
785 struct eap_peer_config *config;
786
787 config = eap_get_config(sm);
788 if (config && config->imsi_identity) {
789 identity = config->imsi_identity;
790 identity_len = config->imsi_identity_len;
791 } else {
792 identity = eap_get_config_identity(sm, &identity_len);
793 }
794 }
795 wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM: Selected identity for MK "
796 "derivation", identity, identity_len);
797 eap_sim_derive_mk(identity, identity_len, data->nonce_mt,
798 data->selected_version, data->ver_list,
799 data->ver_list_len, data->num_chal,
800 (const u8 *) data->kc, data->mk);
801 eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut, data->msk,
802 data->emsk);
803 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, data->nonce_mt,
804 EAP_SIM_NONCE_MT_LEN)) {
805 wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message "
806 "used invalid AT_MAC");
807 #ifdef TEST_FUZZ
808 wpa_printf(MSG_INFO,
809 "TEST: Ignore AT_MAC mismatch for fuzz testing");
810 #else /* TEST_FUZZ */
811 return eap_sim_client_error(data, id,
812 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
813 #endif /* TEST_FUZZ */
814 }
815
816 /* Old reauthentication identity must not be used anymore. In
817 * other words, if no new reauth identity is received, full
818 * authentication will be used on next reauthentication (using
819 * pseudonym identity or permanent identity). */
820 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
821
822 if (attr->encr_data) {
823 u8 *decrypted;
824 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
825 attr->encr_data_len, attr->iv,
826 &eattr, 0);
827 if (decrypted == NULL) {
828 return eap_sim_client_error(
829 data, id, EAP_SIM_UNABLE_TO_PROCESS_PACKET);
830 }
831 eap_sim_learn_ids(sm, data, &eattr);
832 os_free(decrypted);
833 }
834
835 if (data->result_ind && attr->result_ind)
836 data->use_result_ind = 1;
837
838 if (data->state != FAILURE) {
839 eap_sim_state(data, data->use_result_ind ?
840 RESULT_SUCCESS : SUCCESS);
841 }
842
843 data->num_id_req = 0;
844 data->num_notification = 0;
845 /* RFC 4186 specifies that counter is initialized to one after
846 * fullauth, but initializing it to zero makes it easier to implement
847 * reauth verification. */
848 data->counter = 0;
849 return eap_sim_response_challenge(data, id);
850 }
851
852
eap_sim_process_notification_reauth(struct eap_sim_data * data,struct eap_sim_attrs * attr)853 static int eap_sim_process_notification_reauth(struct eap_sim_data *data,
854 struct eap_sim_attrs *attr)
855 {
856 struct eap_sim_attrs eattr;
857 u8 *decrypted;
858
859 if (attr->encr_data == NULL || attr->iv == NULL) {
860 wpa_printf(MSG_WARNING, "EAP-SIM: Notification message after "
861 "reauth did not include encrypted data");
862 return -1;
863 }
864
865 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
866 attr->encr_data_len, attr->iv, &eattr,
867 0);
868 if (decrypted == NULL) {
869 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted "
870 "data from notification message");
871 return -1;
872 }
873
874 if (eattr.counter < 0 || (size_t) eattr.counter != data->counter) {
875 wpa_printf(MSG_WARNING, "EAP-SIM: Counter in notification "
876 "message does not match with counter in reauth "
877 "message");
878 os_free(decrypted);
879 return -1;
880 }
881
882 os_free(decrypted);
883 return 0;
884 }
885
886
eap_sim_process_notification_auth(struct eap_sim_data * data,const struct wpabuf * reqData,struct eap_sim_attrs * attr)887 static int eap_sim_process_notification_auth(struct eap_sim_data *data,
888 const struct wpabuf *reqData,
889 struct eap_sim_attrs *attr)
890 {
891 if (attr->mac == NULL) {
892 wpa_printf(MSG_INFO, "EAP-SIM: no AT_MAC in after_auth "
893 "Notification message");
894 return -1;
895 }
896
897 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
898 {
899 wpa_printf(MSG_WARNING, "EAP-SIM: Notification message "
900 "used invalid AT_MAC");
901 return -1;
902 }
903
904 if (data->reauth &&
905 eap_sim_process_notification_reauth(data, attr)) {
906 wpa_printf(MSG_WARNING, "EAP-SIM: Invalid notification "
907 "message after reauth");
908 return -1;
909 }
910
911 return 0;
912 }
913
914
eap_sim_process_notification(struct eap_sm * sm,struct eap_sim_data * data,u8 id,const struct wpabuf * reqData,struct eap_sim_attrs * attr)915 static struct wpabuf * eap_sim_process_notification(
916 struct eap_sm *sm, struct eap_sim_data *data, u8 id,
917 const struct wpabuf *reqData, struct eap_sim_attrs *attr)
918 {
919 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Notification");
920 if (data->num_notification > 0) {
921 wpa_printf(MSG_INFO, "EAP-SIM: too many notification "
922 "rounds (only one allowed)");
923 return eap_sim_client_error(data, id,
924 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
925 }
926 data->num_notification++;
927 if (attr->notification == -1) {
928 wpa_printf(MSG_INFO, "EAP-SIM: no AT_NOTIFICATION in "
929 "Notification message");
930 return eap_sim_client_error(data, id,
931 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
932 }
933
934 if ((attr->notification & 0x4000) == 0 &&
935 eap_sim_process_notification_auth(data, reqData, attr)) {
936 return eap_sim_client_error(data, id,
937 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
938 }
939
940 eap_sim_report_notification(sm->msg_ctx, attr->notification, 0);
941 if (attr->notification >= 0 && attr->notification < 32768) {
942 data->error_code = attr->notification;
943 eap_sim_state(data, FAILURE);
944 } else if (attr->notification == EAP_SIM_SUCCESS &&
945 data->state == RESULT_SUCCESS)
946 eap_sim_state(data, SUCCESS);
947 return eap_sim_response_notification(data, id, attr->notification);
948 }
949
950
eap_sim_process_reauthentication(struct eap_sm * sm,struct eap_sim_data * data,u8 id,const struct wpabuf * reqData,struct eap_sim_attrs * attr)951 static struct wpabuf * eap_sim_process_reauthentication(
952 struct eap_sm *sm, struct eap_sim_data *data, u8 id,
953 const struct wpabuf *reqData, struct eap_sim_attrs *attr)
954 {
955 struct eap_sim_attrs eattr;
956 u8 *decrypted;
957
958 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Reauthentication");
959
960 if (data->reauth_id == NULL) {
961 wpa_printf(MSG_WARNING, "EAP-SIM: Server is trying "
962 "reauthentication, but no reauth_id available");
963 return eap_sim_client_error(data, id,
964 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
965 }
966
967 data->reauth = 1;
968 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
969 {
970 wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication "
971 "did not have valid AT_MAC");
972 #ifdef TEST_FUZZ
973 wpa_printf(MSG_INFO,
974 "TEST: Ignore AT_MAC mismatch for fuzz testing");
975 #else /* TEST_FUZZ */
976 return eap_sim_client_error(data, id,
977 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
978 #endif /* TEST_FUZZ */
979 }
980
981 /* At this stage the received MAC has been verified. Use this MAC for
982 * reauth Session-Id calculation if all other checks pass.
983 * The peer does not use the local MAC but the received MAC in deriving
984 * Session-Id. */
985 #ifdef TEST_FUZZ
986 if (attr->mac)
987 os_memcpy(data->reauth_mac, attr->mac, EAP_SIM_MAC_LEN);
988 else
989 os_memset(data->reauth_mac, 0x12, EAP_SIM_MAC_LEN);
990 #else /* TEST_FUZZ */
991 os_memcpy(data->reauth_mac, attr->mac, EAP_SIM_MAC_LEN);
992 #endif /* TEST_FUZZ */
993 wpa_hexdump(MSG_DEBUG, "EAP-SIM: Server MAC",
994 data->reauth_mac, EAP_SIM_MAC_LEN);
995
996 if (attr->encr_data == NULL || attr->iv == NULL) {
997 wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication "
998 "message did not include encrypted data");
999 return eap_sim_client_error(data, id,
1000 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1001 }
1002
1003 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
1004 attr->encr_data_len, attr->iv, &eattr,
1005 0);
1006 if (decrypted == NULL) {
1007 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted "
1008 "data from reauthentication message");
1009 return eap_sim_client_error(data, id,
1010 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1011 }
1012
1013 if (eattr.nonce_s == NULL || eattr.counter < 0) {
1014 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No%s%s in reauth packet",
1015 !eattr.nonce_s ? " AT_NONCE_S" : "",
1016 eattr.counter < 0 ? " AT_COUNTER" : "");
1017 os_free(decrypted);
1018 return eap_sim_client_error(data, id,
1019 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1020 }
1021
1022 if (eattr.counter < 0 || (size_t) eattr.counter <= data->counter) {
1023 struct wpabuf *res;
1024 wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid counter "
1025 "(%d <= %d)", eattr.counter, data->counter);
1026 data->counter_too_small = eattr.counter;
1027
1028 /* Reply using Re-auth w/ AT_COUNTER_TOO_SMALL. The current
1029 * reauth_id must not be used to start a new reauthentication.
1030 * However, since it was used in the last EAP-Response-Identity
1031 * packet, it has to saved for the following fullauth to be
1032 * used in MK derivation. */
1033 os_free(data->last_eap_identity);
1034 data->last_eap_identity = data->reauth_id;
1035 data->last_eap_identity_len = data->reauth_id_len;
1036 data->reauth_id = NULL;
1037 data->reauth_id_len = 0;
1038
1039 res = eap_sim_response_reauth(data, id, 1, eattr.nonce_s);
1040 os_free(decrypted);
1041
1042 return res;
1043 }
1044 data->counter = eattr.counter;
1045
1046 os_memcpy(data->nonce_s, eattr.nonce_s, EAP_SIM_NONCE_S_LEN);
1047 wpa_hexdump(MSG_DEBUG, "EAP-SIM: (encr) AT_NONCE_S",
1048 data->nonce_s, EAP_SIM_NONCE_S_LEN);
1049
1050 eap_sim_derive_keys_reauth(data->counter,
1051 data->reauth_id, data->reauth_id_len,
1052 data->nonce_s, data->mk, data->msk,
1053 data->emsk);
1054 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
1055 eap_sim_learn_ids(sm, data, &eattr);
1056
1057 if (data->result_ind && attr->result_ind)
1058 data->use_result_ind = 1;
1059
1060 if (data->state != FAILURE) {
1061 eap_sim_state(data, data->use_result_ind ?
1062 RESULT_SUCCESS : SUCCESS);
1063 }
1064
1065 data->num_id_req = 0;
1066 data->num_notification = 0;
1067 if (data->counter > EAP_SIM_MAX_FAST_REAUTHS) {
1068 wpa_printf(MSG_DEBUG, "EAP-SIM: Maximum number of "
1069 "fast reauths performed - force fullauth");
1070 eap_sim_clear_identities(sm, data,
1071 CLEAR_REAUTH_ID | CLEAR_EAP_ID);
1072 }
1073 os_free(decrypted);
1074 return eap_sim_response_reauth(data, id, 0, data->nonce_s);
1075 }
1076
1077
eap_sim_process(struct eap_sm * sm,void * priv,struct eap_method_ret * ret,const struct wpabuf * reqData)1078 static struct wpabuf * eap_sim_process(struct eap_sm *sm, void *priv,
1079 struct eap_method_ret *ret,
1080 const struct wpabuf *reqData)
1081 {
1082 struct eap_sim_data *data = priv;
1083 const struct eap_hdr *req;
1084 u8 subtype, id;
1085 struct wpabuf *res;
1086 const u8 *pos;
1087 struct eap_sim_attrs attr;
1088 size_t len;
1089
1090 wpa_hexdump_buf(MSG_DEBUG, "EAP-SIM: EAP data", reqData);
1091 if (eap_get_config_identity(sm, &len) == NULL) {
1092 wpa_printf(MSG_INFO, "EAP-SIM: Identity not configured");
1093 eap_sm_request_identity(sm);
1094 ret->ignore = TRUE;
1095 return NULL;
1096 }
1097
1098 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_SIM, reqData, &len);
1099 if (pos == NULL || len < 3) {
1100 ret->ignore = TRUE;
1101 return NULL;
1102 }
1103 req = wpabuf_head(reqData);
1104 id = req->identifier;
1105 len = be_to_host16(req->length);
1106
1107 ret->ignore = FALSE;
1108 ret->methodState = METHOD_MAY_CONT;
1109 ret->decision = DECISION_FAIL;
1110 ret->allowNotifications = TRUE;
1111
1112 subtype = *pos++;
1113 wpa_printf(MSG_DEBUG, "EAP-SIM: Subtype=%d", subtype);
1114 pos += 2; /* Reserved */
1115
1116 if (eap_sim_parse_attr(pos, wpabuf_head_u8(reqData) + len, &attr, 0,
1117 0)) {
1118 res = eap_sim_client_error(data, id,
1119 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1120 goto done;
1121 }
1122
1123 switch (subtype) {
1124 case EAP_SIM_SUBTYPE_START:
1125 res = eap_sim_process_start(sm, data, id, &attr);
1126 break;
1127 case EAP_SIM_SUBTYPE_CHALLENGE:
1128 res = eap_sim_process_challenge(sm, data, id, reqData, &attr);
1129 break;
1130 case EAP_SIM_SUBTYPE_NOTIFICATION:
1131 res = eap_sim_process_notification(sm, data, id, reqData,
1132 &attr);
1133 break;
1134 case EAP_SIM_SUBTYPE_REAUTHENTICATION:
1135 res = eap_sim_process_reauthentication(sm, data, id, reqData,
1136 &attr);
1137 break;
1138 case EAP_SIM_SUBTYPE_CLIENT_ERROR:
1139 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Client-Error");
1140 res = eap_sim_client_error(data, id,
1141 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1142 break;
1143 default:
1144 wpa_printf(MSG_DEBUG, "EAP-SIM: Unknown subtype=%d", subtype);
1145 res = eap_sim_client_error(data, id,
1146 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1147 break;
1148 }
1149
1150 done:
1151 if (data->state == FAILURE) {
1152 ret->decision = DECISION_FAIL;
1153 ret->methodState = METHOD_DONE;
1154 } else if (data->state == SUCCESS) {
1155 ret->decision = data->use_result_ind ?
1156 DECISION_UNCOND_SUCC : DECISION_COND_SUCC;
1157 ret->methodState = data->use_result_ind ?
1158 METHOD_DONE : METHOD_MAY_CONT;
1159 } else if (data->state == RESULT_SUCCESS)
1160 ret->methodState = METHOD_CONT;
1161
1162 if (ret->methodState == METHOD_DONE) {
1163 ret->allowNotifications = FALSE;
1164 }
1165
1166 return res;
1167 }
1168
1169
eap_sim_has_reauth_data(struct eap_sm * sm,void * priv)1170 static Boolean eap_sim_has_reauth_data(struct eap_sm *sm, void *priv)
1171 {
1172 struct eap_sim_data *data = priv;
1173 return data->pseudonym || data->reauth_id;
1174 }
1175
1176
eap_sim_deinit_for_reauth(struct eap_sm * sm,void * priv)1177 static void eap_sim_deinit_for_reauth(struct eap_sm *sm, void *priv)
1178 {
1179 struct eap_sim_data *data = priv;
1180 eap_sim_clear_identities(sm, data, CLEAR_EAP_ID);
1181 data->use_result_ind = 0;
1182 eap_sim_clear_keys(data, 1);
1183 }
1184
1185
eap_sim_init_for_reauth(struct eap_sm * sm,void * priv)1186 static void * eap_sim_init_for_reauth(struct eap_sm *sm, void *priv)
1187 {
1188 struct eap_sim_data *data = priv;
1189 if (random_get_bytes(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) {
1190 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data "
1191 "for NONCE_MT");
1192 eap_sim_deinit(sm, data);
1193 return NULL;
1194 }
1195 data->num_id_req = 0;
1196 data->num_notification = 0;
1197 eap_sim_state(data, CONTINUE);
1198 return priv;
1199 }
1200
1201
eap_sim_get_identity(struct eap_sm * sm,void * priv,size_t * len)1202 static const u8 * eap_sim_get_identity(struct eap_sm *sm, void *priv,
1203 size_t *len)
1204 {
1205 struct eap_sim_data *data = priv;
1206
1207 if (data->reauth_id) {
1208 *len = data->reauth_id_len;
1209 return data->reauth_id;
1210 }
1211
1212 if (data->pseudonym) {
1213 *len = data->pseudonym_len;
1214 return data->pseudonym;
1215 }
1216
1217 return NULL;
1218 }
1219
1220
eap_sim_isKeyAvailable(struct eap_sm * sm,void * priv)1221 static Boolean eap_sim_isKeyAvailable(struct eap_sm *sm, void *priv)
1222 {
1223 struct eap_sim_data *data = priv;
1224 return data->state == SUCCESS;
1225 }
1226
1227
eap_sim_getKey(struct eap_sm * sm,void * priv,size_t * len)1228 static u8 * eap_sim_getKey(struct eap_sm *sm, void *priv, size_t *len)
1229 {
1230 struct eap_sim_data *data = priv;
1231 u8 *key;
1232
1233 if (data->state != SUCCESS)
1234 return NULL;
1235
1236 key = os_memdup(data->msk, EAP_SIM_KEYING_DATA_LEN);
1237 if (key == NULL)
1238 return NULL;
1239
1240 *len = EAP_SIM_KEYING_DATA_LEN;
1241
1242 return key;
1243 }
1244
1245
eap_sim_get_session_id(struct eap_sm * sm,void * priv,size_t * len)1246 static u8 * eap_sim_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1247 {
1248 struct eap_sim_data *data = priv;
1249 u8 *id;
1250
1251 if (data->state != SUCCESS)
1252 return NULL;
1253
1254 if (!data->reauth)
1255 *len = 1 + data->num_chal * GSM_RAND_LEN + EAP_SIM_NONCE_MT_LEN;
1256 else
1257 *len = 1 + EAP_SIM_NONCE_S_LEN + EAP_SIM_MAC_LEN;
1258 id = os_malloc(*len);
1259 if (id == NULL)
1260 return NULL;
1261
1262 id[0] = EAP_TYPE_SIM;
1263 if (!data->reauth) {
1264 os_memcpy(id + 1, data->rand, data->num_chal * GSM_RAND_LEN);
1265 os_memcpy(id + 1 + data->num_chal * GSM_RAND_LEN,
1266 data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
1267 } else {
1268 os_memcpy(id + 1, data->nonce_s, EAP_SIM_NONCE_S_LEN);
1269 os_memcpy(id + 1 + EAP_SIM_NONCE_S_LEN, data->reauth_mac,
1270 EAP_SIM_MAC_LEN);
1271 }
1272 wpa_hexdump(MSG_DEBUG, "EAP-SIM: Derived Session-Id", id, *len);
1273
1274 return id;
1275 }
1276
1277
eap_sim_get_emsk(struct eap_sm * sm,void * priv,size_t * len)1278 static u8 * eap_sim_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1279 {
1280 struct eap_sim_data *data = priv;
1281 u8 *key;
1282
1283 if (data->state != SUCCESS)
1284 return NULL;
1285
1286 key = os_memdup(data->emsk, EAP_EMSK_LEN);
1287 if (key == NULL)
1288 return NULL;
1289
1290 *len = EAP_EMSK_LEN;
1291
1292 return key;
1293 }
1294
1295
eap_sim_get_error_code(void * priv)1296 static int eap_sim_get_error_code(void *priv)
1297 {
1298 struct eap_sim_data *data = priv;
1299 int current_data_error;
1300
1301 if (!data)
1302 return NO_EAP_METHOD_ERROR;
1303
1304 current_data_error = data->error_code;
1305
1306 /* Now reset for next transaction */
1307 data->error_code = NO_EAP_METHOD_ERROR;
1308
1309 return current_data_error;
1310 }
1311
1312
eap_peer_sim_register(void)1313 int eap_peer_sim_register(void)
1314 {
1315 struct eap_method *eap;
1316
1317 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1318 EAP_VENDOR_IETF, EAP_TYPE_SIM, "SIM");
1319 if (eap == NULL)
1320 return -1;
1321
1322 eap->init = eap_sim_init;
1323 eap->deinit = eap_sim_deinit;
1324 eap->process = eap_sim_process;
1325 eap->isKeyAvailable = eap_sim_isKeyAvailable;
1326 eap->getKey = eap_sim_getKey;
1327 eap->getSessionId = eap_sim_get_session_id;
1328 eap->has_reauth_data = eap_sim_has_reauth_data;
1329 eap->deinit_for_reauth = eap_sim_deinit_for_reauth;
1330 eap->init_for_reauth = eap_sim_init_for_reauth;
1331 eap->get_identity = eap_sim_get_identity;
1332 eap->get_emsk = eap_sim_get_emsk;
1333 eap->get_error_code = eap_sim_get_error_code;
1334
1335 return eap_peer_method_register(eap);
1336 }
1337