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