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, START_DONE, 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 START_DONE:
62 return "START_DONE";
63 case RESULT_SUCCESS:
64 return "RESULT_SUCCESS";
65 case SUCCESS:
66 return "SUCCESS";
67 case FAILURE:
68 return "FAILURE";
69 default:
70 return "?";
71 }
72 }
73 #endif /* CONFIG_NO_STDOUT_DEBUG */
74
75
eap_sim_state(struct eap_sim_data * data,int state)76 static void eap_sim_state(struct eap_sim_data *data, int state)
77 {
78 wpa_printf(MSG_DEBUG, "EAP-SIM: %s -> %s",
79 eap_sim_state_txt(data->state),
80 eap_sim_state_txt(state));
81 data->state = state;
82 }
83
84
eap_sim_init(struct eap_sm * sm)85 static void * eap_sim_init(struct eap_sm *sm)
86 {
87 struct eap_sim_data *data;
88 struct eap_peer_config *config = eap_get_config(sm);
89
90 data = os_zalloc(sizeof(*data));
91 if (data == NULL)
92 return NULL;
93
94 if (random_get_bytes(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) {
95 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data "
96 "for NONCE_MT");
97 os_free(data);
98 return NULL;
99 }
100
101 /* Zero is a valid error code, so we need to initialize */
102 data->error_code = NO_EAP_METHOD_ERROR;
103
104 data->min_num_chal = 2;
105 if (config && config->phase1) {
106 char *pos = os_strstr(config->phase1, "sim_min_num_chal=");
107 if (pos) {
108 data->min_num_chal = atoi(pos + 17);
109 if (data->min_num_chal < 2 || data->min_num_chal > 3) {
110 wpa_printf(MSG_WARNING, "EAP-SIM: Invalid "
111 "sim_min_num_chal configuration "
112 "(%lu, expected 2 or 3)",
113 (unsigned long) data->min_num_chal);
114 os_free(data);
115 return NULL;
116 }
117 wpa_printf(MSG_DEBUG, "EAP-SIM: Set minimum number of "
118 "challenges to %lu",
119 (unsigned long) data->min_num_chal);
120 }
121
122 data->result_ind = os_strstr(config->phase1, "result_ind=1") !=
123 NULL;
124 }
125
126 data->use_pseudonym = !sm->init_phase2;
127 if (config && config->anonymous_identity && data->use_pseudonym) {
128 data->pseudonym = os_malloc(config->anonymous_identity_len);
129 if (data->pseudonym) {
130 os_memcpy(data->pseudonym, config->anonymous_identity,
131 config->anonymous_identity_len);
132 data->pseudonym_len = config->anonymous_identity_len;
133 }
134 }
135
136 eap_sim_state(data, CONTINUE);
137
138 return data;
139 }
140
141
eap_sim_clear_keys(struct eap_sim_data * data,int reauth)142 static void eap_sim_clear_keys(struct eap_sim_data *data, int reauth)
143 {
144 if (!reauth) {
145 os_memset(data->mk, 0, EAP_SIM_MK_LEN);
146 os_memset(data->k_aut, 0, EAP_SIM_K_AUT_LEN);
147 os_memset(data->k_encr, 0, EAP_SIM_K_ENCR_LEN);
148 }
149 os_memset(data->kc, 0, 3 * EAP_SIM_KC_LEN);
150 os_memset(data->sres, 0, 3 * EAP_SIM_SRES_LEN);
151 os_memset(data->msk, 0, EAP_SIM_KEYING_DATA_LEN);
152 os_memset(data->emsk, 0, EAP_EMSK_LEN);
153 }
154
155
eap_sim_deinit(struct eap_sm * sm,void * priv)156 static void eap_sim_deinit(struct eap_sm *sm, void *priv)
157 {
158 struct eap_sim_data *data = priv;
159 if (data) {
160 os_free(data->ver_list);
161 os_free(data->pseudonym);
162 os_free(data->reauth_id);
163 os_free(data->last_eap_identity);
164 eap_sim_clear_keys(data, 0);
165 os_free(data);
166 }
167 }
168
169
eap_sim_ext_sim_req(struct eap_sm * sm,struct eap_sim_data * data)170 static int eap_sim_ext_sim_req(struct eap_sm *sm, struct eap_sim_data *data)
171 {
172 char req[200], *pos, *end;
173 size_t i;
174
175 wpa_printf(MSG_DEBUG, "EAP-SIM: Use external SIM processing");
176 pos = req;
177 end = pos + sizeof(req);
178 pos += os_snprintf(pos, end - pos, "GSM-AUTH");
179 for (i = 0; i < data->num_chal; i++) {
180 pos += os_snprintf(pos, end - pos, ":");
181 pos += wpa_snprintf_hex(pos, end - pos, data->rand[i],
182 GSM_RAND_LEN);
183 }
184
185 eap_sm_request_sim(sm, req);
186 return 1;
187 }
188
189
eap_sim_ext_sim_result(struct eap_sm * sm,struct eap_sim_data * data,struct eap_peer_config * conf)190 static int eap_sim_ext_sim_result(struct eap_sm *sm, struct eap_sim_data *data,
191 struct eap_peer_config *conf)
192 {
193 char *resp, *pos;
194 size_t i;
195
196 wpa_printf(MSG_DEBUG,
197 "EAP-SIM: Use result from external SIM processing");
198
199 resp = conf->external_sim_resp;
200 conf->external_sim_resp = NULL;
201
202 if (os_strncmp(resp, "GSM-AUTH:", 9) != 0) {
203 wpa_printf(MSG_DEBUG, "EAP-SIM: Unrecognized external SIM processing response");
204 os_free(resp);
205 return -1;
206 }
207
208 pos = resp + 9;
209 for (i = 0; i < data->num_chal; i++) {
210 wpa_hexdump(MSG_DEBUG, "EAP-SIM: RAND",
211 data->rand[i], GSM_RAND_LEN);
212
213 if (hexstr2bin(pos, data->kc[i], EAP_SIM_KC_LEN) < 0)
214 goto invalid;
215 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: Kc",
216 data->kc[i], EAP_SIM_KC_LEN);
217 pos += EAP_SIM_KC_LEN * 2;
218 if (*pos != ':')
219 goto invalid;
220 pos++;
221
222 if (hexstr2bin(pos, data->sres[i], EAP_SIM_SRES_LEN) < 0)
223 goto invalid;
224 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: SRES",
225 data->sres[i], EAP_SIM_SRES_LEN);
226 pos += EAP_SIM_SRES_LEN * 2;
227 if (i + 1 < data->num_chal) {
228 if (*pos != ':')
229 goto invalid;
230 pos++;
231 }
232 }
233
234 os_free(resp);
235 return 0;
236
237 invalid:
238 wpa_printf(MSG_DEBUG, "EAP-SIM: Invalid external SIM processing GSM-AUTH response");
239 os_free(resp);
240 return -1;
241 }
242
243
eap_sim_gsm_auth(struct eap_sm * sm,struct eap_sim_data * data)244 static int eap_sim_gsm_auth(struct eap_sm *sm, struct eap_sim_data *data)
245 {
246 struct eap_peer_config *conf;
247
248 wpa_printf(MSG_DEBUG, "EAP-SIM: GSM authentication algorithm");
249
250 conf = eap_get_config(sm);
251 if (conf == NULL)
252 return -1;
253
254 if (sm->external_sim) {
255 if (conf->external_sim_resp)
256 return eap_sim_ext_sim_result(sm, data, conf);
257 else
258 return eap_sim_ext_sim_req(sm, data);
259 }
260
261 #ifdef PCSC_FUNCS
262 if (conf->pcsc) {
263 if (scard_gsm_auth(sm->scard_ctx, data->rand[0],
264 data->sres[0], data->kc[0]) ||
265 scard_gsm_auth(sm->scard_ctx, data->rand[1],
266 data->sres[1], data->kc[1]) ||
267 (data->num_chal > 2 &&
268 scard_gsm_auth(sm->scard_ctx, data->rand[2],
269 data->sres[2], data->kc[2]))) {
270 wpa_printf(MSG_DEBUG, "EAP-SIM: GSM SIM "
271 "authentication could not be completed");
272 return -1;
273 }
274 return 0;
275 }
276 #endif /* PCSC_FUNCS */
277
278 #ifdef CONFIG_SIM_SIMULATOR
279 if (conf->password) {
280 u8 opc[16], k[16];
281 const char *pos;
282 size_t i;
283 wpa_printf(MSG_DEBUG, "EAP-SIM: Use internal GSM-Milenage "
284 "implementation for authentication");
285 if (conf->password_len < 65) {
286 wpa_printf(MSG_DEBUG, "EAP-SIM: invalid GSM-Milenage "
287 "password");
288 return -1;
289 }
290 pos = (const char *) conf->password;
291 if (hexstr2bin(pos, k, 16))
292 return -1;
293 pos += 32;
294 if (*pos != ':')
295 return -1;
296 pos++;
297
298 if (hexstr2bin(pos, opc, 16))
299 return -1;
300
301 for (i = 0; i < data->num_chal; i++) {
302 if (gsm_milenage(opc, k, data->rand[i],
303 data->sres[i], data->kc[i])) {
304 wpa_printf(MSG_DEBUG, "EAP-SIM: "
305 "GSM-Milenage authentication "
306 "could not be completed");
307 return -1;
308 }
309 wpa_hexdump(MSG_DEBUG, "EAP-SIM: RAND",
310 data->rand[i], GSM_RAND_LEN);
311 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: SRES",
312 data->sres[i], EAP_SIM_SRES_LEN);
313 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: Kc",
314 data->kc[i], EAP_SIM_KC_LEN);
315 }
316 return 0;
317 }
318 #endif /* CONFIG_SIM_SIMULATOR */
319
320 #ifdef CONFIG_SIM_HARDCODED
321 /* These hardcoded Kc and SRES values are used for testing. RAND to
322 * KC/SREC mapping is very bogus as far as real authentication is
323 * concerned, but it is quite useful for cases where the AS is rotating
324 * the order of pre-configured values. */
325 {
326 size_t i;
327
328 wpa_printf(MSG_DEBUG, "EAP-SIM: Use hardcoded Kc and SRES "
329 "values for testing");
330
331 for (i = 0; i < data->num_chal; i++) {
332 if (data->rand[i][0] == 0xaa) {
333 os_memcpy(data->kc[i],
334 "\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7",
335 EAP_SIM_KC_LEN);
336 os_memcpy(data->sres[i], "\xd1\xd2\xd3\xd4",
337 EAP_SIM_SRES_LEN);
338 } else if (data->rand[i][0] == 0xbb) {
339 os_memcpy(data->kc[i],
340 "\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7",
341 EAP_SIM_KC_LEN);
342 os_memcpy(data->sres[i], "\xe1\xe2\xe3\xe4",
343 EAP_SIM_SRES_LEN);
344 } else {
345 os_memcpy(data->kc[i],
346 "\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7",
347 EAP_SIM_KC_LEN);
348 os_memcpy(data->sres[i], "\xf1\xf2\xf3\xf4",
349 EAP_SIM_SRES_LEN);
350 }
351 }
352 }
353
354 return 0;
355
356 #else /* CONFIG_SIM_HARDCODED */
357
358 wpa_printf(MSG_DEBUG, "EAP-SIM: No GSM authentication algorithm "
359 "enabled");
360 return -1;
361
362 #endif /* CONFIG_SIM_HARDCODED */
363 }
364
365
eap_sim_supported_ver(int version)366 static int eap_sim_supported_ver(int version)
367 {
368 return version == EAP_SIM_VERSION;
369 }
370
371
372 #define CLEAR_PSEUDONYM 0x01
373 #define CLEAR_REAUTH_ID 0x02
374 #define CLEAR_EAP_ID 0x04
375
eap_sim_clear_identities(struct eap_sm * sm,struct eap_sim_data * data,int id)376 static void eap_sim_clear_identities(struct eap_sm *sm,
377 struct eap_sim_data *data, int id)
378 {
379 if ((id & CLEAR_PSEUDONYM) && data->pseudonym) {
380 wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old pseudonym");
381 os_free(data->pseudonym);
382 data->pseudonym = NULL;
383 data->pseudonym_len = 0;
384 if (data->use_pseudonym)
385 eap_set_anon_id(sm, NULL, 0);
386 }
387 if ((id & CLEAR_REAUTH_ID) && data->reauth_id) {
388 wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old reauth_id");
389 os_free(data->reauth_id);
390 data->reauth_id = NULL;
391 data->reauth_id_len = 0;
392 }
393 if ((id & CLEAR_EAP_ID) && data->last_eap_identity) {
394 wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old eap_id");
395 os_free(data->last_eap_identity);
396 data->last_eap_identity = NULL;
397 data->last_eap_identity_len = 0;
398 }
399 }
400
401
eap_sim_learn_ids(struct eap_sm * sm,struct eap_sim_data * data,struct eap_sim_attrs * attr)402 static int eap_sim_learn_ids(struct eap_sm *sm, struct eap_sim_data *data,
403 struct eap_sim_attrs *attr)
404 {
405 if (attr->next_pseudonym) {
406 const u8 *identity = NULL;
407 size_t identity_len = 0;
408 const u8 *realm = NULL;
409 size_t realm_len = 0;
410
411 wpa_hexdump_ascii(MSG_DEBUG,
412 "EAP-SIM: (encr) AT_NEXT_PSEUDONYM",
413 attr->next_pseudonym,
414 attr->next_pseudonym_len);
415 os_free(data->pseudonym);
416 /* Look for the realm of the permanent identity */
417 identity = eap_get_config_identity(sm, &identity_len);
418 if (identity) {
419 for (realm = identity, realm_len = identity_len;
420 realm_len > 0; realm_len--, realm++) {
421 if (*realm == '@')
422 break;
423 }
424 }
425 data->pseudonym = os_malloc(attr->next_pseudonym_len +
426 realm_len);
427 if (data->pseudonym == NULL) {
428 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No memory for "
429 "next pseudonym");
430 data->pseudonym_len = 0;
431 return -1;
432 }
433 os_memcpy(data->pseudonym, attr->next_pseudonym,
434 attr->next_pseudonym_len);
435 if (realm_len) {
436 os_memcpy(data->pseudonym + attr->next_pseudonym_len,
437 realm, realm_len);
438 }
439 data->pseudonym_len = attr->next_pseudonym_len + realm_len;
440 if (data->use_pseudonym)
441 eap_set_anon_id(sm, data->pseudonym,
442 data->pseudonym_len);
443 }
444
445 if (attr->next_reauth_id) {
446 os_free(data->reauth_id);
447 data->reauth_id = os_memdup(attr->next_reauth_id,
448 attr->next_reauth_id_len);
449 if (data->reauth_id == NULL) {
450 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No memory for "
451 "next reauth_id");
452 data->reauth_id_len = 0;
453 return -1;
454 }
455 data->reauth_id_len = attr->next_reauth_id_len;
456 wpa_hexdump_ascii(MSG_DEBUG,
457 "EAP-SIM: (encr) AT_NEXT_REAUTH_ID",
458 data->reauth_id,
459 data->reauth_id_len);
460 }
461
462 return 0;
463 }
464
465
eap_sim_client_error(struct eap_sim_data * data,u8 id,int err)466 static struct wpabuf * eap_sim_client_error(struct eap_sim_data *data, u8 id,
467 int err)
468 {
469 struct eap_sim_msg *msg;
470
471 eap_sim_state(data, FAILURE);
472 data->num_id_req = 0;
473 data->num_notification = 0;
474
475 wpa_printf(MSG_DEBUG, "EAP-SIM: Send Client-Error (error code %d)",
476 err);
477 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
478 EAP_SIM_SUBTYPE_CLIENT_ERROR);
479 eap_sim_msg_add(msg, EAP_SIM_AT_CLIENT_ERROR_CODE, err, NULL, 0);
480 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, NULL, NULL, 0);
481 }
482
483
eap_sim_response_start(struct eap_sm * sm,struct eap_sim_data * data,u8 id,enum eap_sim_id_req id_req)484 static struct wpabuf * eap_sim_response_start(struct eap_sm *sm,
485 struct eap_sim_data *data, u8 id,
486 enum eap_sim_id_req id_req)
487 {
488 const u8 *identity = NULL;
489 size_t identity_len = 0;
490 struct eap_sim_msg *msg;
491 struct wpabuf *resp;
492
493 data->reauth = 0;
494 if (id_req == ANY_ID && data->reauth_id) {
495 identity = data->reauth_id;
496 identity_len = data->reauth_id_len;
497 data->reauth = 1;
498 } else if ((id_req == ANY_ID || id_req == FULLAUTH_ID) &&
499 data->pseudonym &&
500 !eap_sim_anonymous_username(data->pseudonym,
501 data->pseudonym_len)) {
502 identity = data->pseudonym;
503 identity_len = data->pseudonym_len;
504 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID);
505 } else if (id_req != NO_ID_REQ) {
506 identity = eap_get_config_identity(sm, &identity_len);
507 if (identity) {
508 int ids = CLEAR_PSEUDONYM | CLEAR_REAUTH_ID;
509
510 if (data->pseudonym &&
511 eap_sim_anonymous_username(data->pseudonym,
512 data->pseudonym_len))
513 ids &= ~CLEAR_PSEUDONYM;
514 eap_sim_clear_identities(sm, data, ids);
515 }
516 }
517 if (id_req != NO_ID_REQ)
518 eap_sim_clear_identities(sm, data, CLEAR_EAP_ID);
519
520 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Start (id=%d)", id);
521 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id,
522 EAP_TYPE_SIM, EAP_SIM_SUBTYPE_START);
523 if (identity) {
524 wpa_hexdump_ascii(MSG_DEBUG, " AT_IDENTITY",
525 identity, identity_len);
526 eap_sim_msg_add(msg, EAP_SIM_AT_IDENTITY, identity_len,
527 identity, identity_len);
528 }
529 if (!data->reauth) {
530 wpa_hexdump(MSG_DEBUG, " AT_NONCE_MT",
531 data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
532 eap_sim_msg_add(msg, EAP_SIM_AT_NONCE_MT, 0,
533 data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
534 wpa_printf(MSG_DEBUG, " AT_SELECTED_VERSION %d",
535 data->selected_version);
536 eap_sim_msg_add(msg, EAP_SIM_AT_SELECTED_VERSION,
537 data->selected_version, NULL, 0);
538 }
539
540 resp = eap_sim_msg_finish(msg, EAP_TYPE_SIM, NULL, NULL, 0);
541 if (resp)
542 eap_sim_state(data, START_DONE);
543 return resp;
544 }
545
546
eap_sim_response_challenge(struct eap_sim_data * data,u8 id)547 static struct wpabuf * eap_sim_response_challenge(struct eap_sim_data *data,
548 u8 id)
549 {
550 struct eap_sim_msg *msg;
551
552 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Challenge (id=%d)", id);
553 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
554 EAP_SIM_SUBTYPE_CHALLENGE);
555 if (data->use_result_ind) {
556 wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
557 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
558 }
559 wpa_printf(MSG_DEBUG, " AT_MAC");
560 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
561 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, data->k_aut,
562 (u8 *) data->sres,
563 data->num_chal * EAP_SIM_SRES_LEN);
564 }
565
566
eap_sim_response_reauth(struct eap_sim_data * data,u8 id,int counter_too_small,const u8 * nonce_s)567 static struct wpabuf * eap_sim_response_reauth(struct eap_sim_data *data,
568 u8 id, int counter_too_small,
569 const u8 *nonce_s)
570 {
571 struct eap_sim_msg *msg;
572 unsigned int counter;
573
574 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Reauthentication (id=%d)",
575 id);
576 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
577 EAP_SIM_SUBTYPE_REAUTHENTICATION);
578 wpa_printf(MSG_DEBUG, " AT_IV");
579 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
580 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA);
581
582 if (counter_too_small) {
583 wpa_printf(MSG_DEBUG, " *AT_COUNTER_TOO_SMALL");
584 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER_TOO_SMALL, 0, NULL, 0);
585 counter = data->counter_too_small;
586 } else
587 counter = data->counter;
588
589 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", counter);
590 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0);
591
592 if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) {
593 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt "
594 "AT_ENCR_DATA");
595 eap_sim_msg_free(msg);
596 return NULL;
597 }
598 if (data->use_result_ind) {
599 wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
600 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
601 }
602 wpa_printf(MSG_DEBUG, " AT_MAC");
603 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
604 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, data->k_aut, nonce_s,
605 EAP_SIM_NONCE_S_LEN);
606 }
607
608
eap_sim_response_notification(struct eap_sim_data * data,u8 id,u16 notification)609 static struct wpabuf * eap_sim_response_notification(struct eap_sim_data *data,
610 u8 id, u16 notification)
611 {
612 struct eap_sim_msg *msg;
613 u8 *k_aut = (notification & 0x4000) == 0 ? data->k_aut : NULL;
614
615 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Notification (id=%d)", id);
616 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id,
617 EAP_TYPE_SIM, EAP_SIM_SUBTYPE_NOTIFICATION);
618 if (k_aut && data->reauth) {
619 wpa_printf(MSG_DEBUG, " AT_IV");
620 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
621 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV,
622 EAP_SIM_AT_ENCR_DATA);
623 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", data->counter);
624 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter,
625 NULL, 0);
626 if (eap_sim_msg_add_encr_end(msg, data->k_encr,
627 EAP_SIM_AT_PADDING)) {
628 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt "
629 "AT_ENCR_DATA");
630 eap_sim_msg_free(msg);
631 return NULL;
632 }
633 }
634 if (k_aut) {
635 wpa_printf(MSG_DEBUG, " AT_MAC");
636 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
637 }
638 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, k_aut, (u8 *) "", 0);
639 }
640
641
eap_sim_process_start(struct eap_sm * sm,struct eap_sim_data * data,u8 id,struct eap_sim_attrs * attr)642 static struct wpabuf * eap_sim_process_start(struct eap_sm *sm,
643 struct eap_sim_data *data, u8 id,
644 struct eap_sim_attrs *attr)
645 {
646 int selected_version = -1, id_error;
647 size_t i;
648 u8 *pos;
649
650 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Start");
651 if (attr->version_list == NULL) {
652 wpa_printf(MSG_INFO, "EAP-SIM: No AT_VERSION_LIST in "
653 "SIM/Start");
654 return eap_sim_client_error(data, id,
655 EAP_SIM_UNSUPPORTED_VERSION);
656 }
657
658 os_free(data->ver_list);
659 data->ver_list = os_memdup(attr->version_list, attr->version_list_len);
660 if (data->ver_list == NULL) {
661 wpa_printf(MSG_DEBUG, "EAP-SIM: Failed to allocate "
662 "memory for version list");
663 return eap_sim_client_error(data, id,
664 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
665 }
666 data->ver_list_len = attr->version_list_len;
667 pos = data->ver_list;
668 for (i = 0; i < data->ver_list_len / 2; i++) {
669 int ver = pos[0] * 256 + pos[1];
670 pos += 2;
671 if (eap_sim_supported_ver(ver)) {
672 selected_version = ver;
673 break;
674 }
675 }
676 if (selected_version < 0) {
677 wpa_printf(MSG_INFO, "EAP-SIM: Could not find a supported "
678 "version");
679 return eap_sim_client_error(data, id,
680 EAP_SIM_UNSUPPORTED_VERSION);
681 }
682 wpa_printf(MSG_DEBUG, "EAP-SIM: Selected Version %d",
683 selected_version);
684 data->selected_version = selected_version;
685
686 id_error = 0;
687 switch (attr->id_req) {
688 case NO_ID_REQ:
689 break;
690 case ANY_ID:
691 if (data->num_id_req > 0)
692 id_error++;
693 data->num_id_req++;
694 break;
695 case FULLAUTH_ID:
696 if (data->num_id_req > 1)
697 id_error++;
698 data->num_id_req++;
699 break;
700 case PERMANENT_ID:
701 if (data->num_id_req > 2)
702 id_error++;
703 data->num_id_req++;
704 break;
705 }
706 if (id_error) {
707 wpa_printf(MSG_INFO, "EAP-SIM: Too many ID requests "
708 "used within one authentication");
709 return eap_sim_client_error(data, id,
710 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
711 }
712
713 return eap_sim_response_start(sm, data, id, attr->id_req);
714 }
715
716
eap_sim_process_challenge(struct eap_sm * sm,struct eap_sim_data * data,u8 id,const struct wpabuf * reqData,struct eap_sim_attrs * attr)717 static struct wpabuf * eap_sim_process_challenge(struct eap_sm *sm,
718 struct eap_sim_data *data,
719 u8 id,
720 const struct wpabuf *reqData,
721 struct eap_sim_attrs *attr)
722 {
723 const u8 *identity;
724 size_t identity_len;
725 struct eap_sim_attrs eattr;
726 int res;
727
728 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Challenge");
729 if (data->state != START_DONE) {
730 wpa_printf(MSG_DEBUG,
731 "EAP-SIM: Unexpected Challenge in state %s",
732 eap_sim_state_txt(data->state));
733 return eap_sim_client_error(data, id,
734 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
735 }
736 data->reauth = 0;
737 if (!attr->mac || !attr->rand) {
738 wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message "
739 "did not include%s%s",
740 !attr->mac ? " AT_MAC" : "",
741 !attr->rand ? " AT_RAND" : "");
742 return eap_sim_client_error(data, id,
743 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
744 }
745
746 wpa_printf(MSG_DEBUG, "EAP-SIM: %lu challenges",
747 (unsigned long) attr->num_chal);
748 if (attr->num_chal < data->min_num_chal) {
749 wpa_printf(MSG_INFO, "EAP-SIM: Insufficient number of "
750 "challenges (%lu)", (unsigned long) attr->num_chal);
751 return eap_sim_client_error(data, id,
752 EAP_SIM_INSUFFICIENT_NUM_OF_CHAL);
753 }
754 if (attr->num_chal > 3) {
755 wpa_printf(MSG_INFO, "EAP-SIM: Too many challenges "
756 "(%lu)", (unsigned long) attr->num_chal);
757 return eap_sim_client_error(data, id,
758 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
759 }
760
761 /* Verify that RANDs are different */
762 if (os_memcmp(attr->rand, attr->rand + GSM_RAND_LEN,
763 GSM_RAND_LEN) == 0 ||
764 (attr->num_chal > 2 &&
765 (os_memcmp(attr->rand, attr->rand + 2 * GSM_RAND_LEN,
766 GSM_RAND_LEN) == 0 ||
767 os_memcmp(attr->rand + GSM_RAND_LEN,
768 attr->rand + 2 * GSM_RAND_LEN,
769 GSM_RAND_LEN) == 0))) {
770 wpa_printf(MSG_INFO, "EAP-SIM: Same RAND used multiple times");
771 return eap_sim_client_error(data, id,
772 EAP_SIM_RAND_NOT_FRESH);
773 }
774
775 os_memcpy(data->rand, attr->rand, attr->num_chal * GSM_RAND_LEN);
776 data->num_chal = attr->num_chal;
777
778 res = eap_sim_gsm_auth(sm, data);
779 if (res > 0) {
780 wpa_printf(MSG_DEBUG, "EAP-SIM: Wait for external SIM processing");
781 return NULL;
782 }
783 if (res) {
784 wpa_printf(MSG_WARNING, "EAP-SIM: GSM authentication failed");
785 return eap_sim_client_error(data, id,
786 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
787 }
788 if (data->last_eap_identity) {
789 identity = data->last_eap_identity;
790 identity_len = data->last_eap_identity_len;
791 } else if (data->pseudonym &&
792 !eap_sim_anonymous_username(data->pseudonym,
793 data->pseudonym_len)) {
794 identity = data->pseudonym;
795 identity_len = data->pseudonym_len;
796 } else {
797 struct eap_peer_config *config;
798
799 config = eap_get_config(sm);
800 if (config && config->imsi_identity) {
801 identity = config->imsi_identity;
802 identity_len = config->imsi_identity_len;
803 } else {
804 identity = eap_get_config_identity(sm, &identity_len);
805 }
806 }
807 wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM: Selected identity for MK "
808 "derivation", identity, identity_len);
809 eap_sim_derive_mk(identity, identity_len, data->nonce_mt,
810 data->selected_version, data->ver_list,
811 data->ver_list_len, data->num_chal,
812 (const u8 *) data->kc, data->mk);
813 eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut, data->msk,
814 data->emsk);
815 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, data->nonce_mt,
816 EAP_SIM_NONCE_MT_LEN)) {
817 wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message "
818 "used invalid AT_MAC");
819 #ifdef TEST_FUZZ
820 wpa_printf(MSG_INFO,
821 "TEST: Ignore AT_MAC mismatch for fuzz testing");
822 #else /* TEST_FUZZ */
823 return eap_sim_client_error(data, id,
824 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
825 #endif /* TEST_FUZZ */
826 }
827
828 /* Old reauthentication identity must not be used anymore. In
829 * other words, if no new reauth identity is received, full
830 * authentication will be used on next reauthentication (using
831 * pseudonym identity or permanent identity). */
832 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
833
834 if (attr->encr_data) {
835 u8 *decrypted;
836 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
837 attr->encr_data_len, attr->iv,
838 &eattr, 0);
839 if (decrypted == NULL) {
840 return eap_sim_client_error(
841 data, id, EAP_SIM_UNABLE_TO_PROCESS_PACKET);
842 }
843 eap_sim_learn_ids(sm, data, &eattr);
844 os_free(decrypted);
845 }
846
847 if (data->result_ind && attr->result_ind)
848 data->use_result_ind = 1;
849
850 if (data->state != FAILURE) {
851 eap_sim_state(data, data->use_result_ind ?
852 RESULT_SUCCESS : SUCCESS);
853 }
854
855 data->num_id_req = 0;
856 data->num_notification = 0;
857 /* RFC 4186 specifies that counter is initialized to one after
858 * fullauth, but initializing it to zero makes it easier to implement
859 * reauth verification. */
860 data->counter = 0;
861 return eap_sim_response_challenge(data, id);
862 }
863
864
eap_sim_process_notification_reauth(struct eap_sim_data * data,struct eap_sim_attrs * attr)865 static int eap_sim_process_notification_reauth(struct eap_sim_data *data,
866 struct eap_sim_attrs *attr)
867 {
868 struct eap_sim_attrs eattr;
869 u8 *decrypted;
870
871 if (attr->encr_data == NULL || attr->iv == NULL) {
872 wpa_printf(MSG_WARNING, "EAP-SIM: Notification message after "
873 "reauth did not include encrypted data");
874 return -1;
875 }
876
877 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
878 attr->encr_data_len, attr->iv, &eattr,
879 0);
880 if (decrypted == NULL) {
881 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted "
882 "data from notification message");
883 return -1;
884 }
885
886 if (eattr.counter < 0 || (size_t) eattr.counter != data->counter) {
887 wpa_printf(MSG_WARNING, "EAP-SIM: Counter in notification "
888 "message does not match with counter in reauth "
889 "message");
890 os_free(decrypted);
891 return -1;
892 }
893
894 os_free(decrypted);
895 return 0;
896 }
897
898
eap_sim_process_notification_auth(struct eap_sim_data * data,const struct wpabuf * reqData,struct eap_sim_attrs * attr)899 static int eap_sim_process_notification_auth(struct eap_sim_data *data,
900 const struct wpabuf *reqData,
901 struct eap_sim_attrs *attr)
902 {
903 if (attr->mac == NULL) {
904 wpa_printf(MSG_INFO, "EAP-SIM: no AT_MAC in after_auth "
905 "Notification message");
906 return -1;
907 }
908
909 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
910 {
911 wpa_printf(MSG_WARNING, "EAP-SIM: Notification message "
912 "used invalid AT_MAC");
913 return -1;
914 }
915
916 if (data->reauth &&
917 eap_sim_process_notification_reauth(data, attr)) {
918 wpa_printf(MSG_WARNING, "EAP-SIM: Invalid notification "
919 "message after reauth");
920 return -1;
921 }
922
923 return 0;
924 }
925
926
eap_sim_process_notification(struct eap_sm * sm,struct eap_sim_data * data,u8 id,const struct wpabuf * reqData,struct eap_sim_attrs * attr)927 static struct wpabuf * eap_sim_process_notification(
928 struct eap_sm *sm, struct eap_sim_data *data, u8 id,
929 const struct wpabuf *reqData, struct eap_sim_attrs *attr)
930 {
931 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Notification");
932 if (data->num_notification > 0) {
933 wpa_printf(MSG_INFO, "EAP-SIM: too many notification "
934 "rounds (only one allowed)");
935 return eap_sim_client_error(data, id,
936 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
937 }
938 data->num_notification++;
939 if (attr->notification == -1) {
940 wpa_printf(MSG_INFO, "EAP-SIM: no AT_NOTIFICATION in "
941 "Notification message");
942 return eap_sim_client_error(data, id,
943 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
944 }
945
946 if ((attr->notification & 0x4000) == 0 &&
947 eap_sim_process_notification_auth(data, reqData, attr)) {
948 return eap_sim_client_error(data, id,
949 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
950 }
951
952 eap_sim_report_notification(sm->msg_ctx, attr->notification, 0);
953 if (attr->notification >= 0 && attr->notification < 32768) {
954 data->error_code = attr->notification;
955 eap_sim_state(data, FAILURE);
956 } else if (attr->notification == EAP_SIM_SUCCESS &&
957 data->state == RESULT_SUCCESS)
958 eap_sim_state(data, SUCCESS);
959 return eap_sim_response_notification(data, id, attr->notification);
960 }
961
962
eap_sim_process_reauthentication(struct eap_sm * sm,struct eap_sim_data * data,u8 id,const struct wpabuf * reqData,struct eap_sim_attrs * attr)963 static struct wpabuf * eap_sim_process_reauthentication(
964 struct eap_sm *sm, struct eap_sim_data *data, u8 id,
965 const struct wpabuf *reqData, struct eap_sim_attrs *attr)
966 {
967 struct eap_sim_attrs eattr;
968 u8 *decrypted;
969
970 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Reauthentication");
971
972 if (data->reauth_id == NULL) {
973 wpa_printf(MSG_WARNING, "EAP-SIM: Server is trying "
974 "reauthentication, but no reauth_id available");
975 return eap_sim_client_error(data, id,
976 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
977 }
978
979 data->reauth = 1;
980 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
981 {
982 wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication "
983 "did not have valid AT_MAC");
984 #ifdef TEST_FUZZ
985 wpa_printf(MSG_INFO,
986 "TEST: Ignore AT_MAC mismatch for fuzz testing");
987 #else /* TEST_FUZZ */
988 return eap_sim_client_error(data, id,
989 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
990 #endif /* TEST_FUZZ */
991 }
992
993 /* At this stage the received MAC has been verified. Use this MAC for
994 * reauth Session-Id calculation if all other checks pass.
995 * The peer does not use the local MAC but the received MAC in deriving
996 * Session-Id. */
997 #ifdef TEST_FUZZ
998 if (attr->mac)
999 os_memcpy(data->reauth_mac, attr->mac, EAP_SIM_MAC_LEN);
1000 else
1001 os_memset(data->reauth_mac, 0x12, EAP_SIM_MAC_LEN);
1002 #else /* TEST_FUZZ */
1003 os_memcpy(data->reauth_mac, attr->mac, EAP_SIM_MAC_LEN);
1004 #endif /* TEST_FUZZ */
1005 wpa_hexdump(MSG_DEBUG, "EAP-SIM: Server MAC",
1006 data->reauth_mac, EAP_SIM_MAC_LEN);
1007
1008 if (attr->encr_data == NULL || attr->iv == NULL) {
1009 wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication "
1010 "message did not include encrypted data");
1011 return eap_sim_client_error(data, id,
1012 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1013 }
1014
1015 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
1016 attr->encr_data_len, attr->iv, &eattr,
1017 0);
1018 if (decrypted == NULL) {
1019 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted "
1020 "data from reauthentication message");
1021 return eap_sim_client_error(data, id,
1022 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1023 }
1024
1025 if (eattr.nonce_s == NULL || eattr.counter < 0) {
1026 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No%s%s in reauth packet",
1027 !eattr.nonce_s ? " AT_NONCE_S" : "",
1028 eattr.counter < 0 ? " AT_COUNTER" : "");
1029 os_free(decrypted);
1030 return eap_sim_client_error(data, id,
1031 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1032 }
1033
1034 if (eattr.counter < 0 || (size_t) eattr.counter <= data->counter) {
1035 struct wpabuf *res;
1036 wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid counter "
1037 "(%d <= %d)", eattr.counter, data->counter);
1038 data->counter_too_small = eattr.counter;
1039
1040 /* Reply using Re-auth w/ AT_COUNTER_TOO_SMALL. The current
1041 * reauth_id must not be used to start a new reauthentication.
1042 * However, since it was used in the last EAP-Response-Identity
1043 * packet, it has to saved for the following fullauth to be
1044 * used in MK derivation. */
1045 os_free(data->last_eap_identity);
1046 data->last_eap_identity = data->reauth_id;
1047 data->last_eap_identity_len = data->reauth_id_len;
1048 data->reauth_id = NULL;
1049 data->reauth_id_len = 0;
1050
1051 res = eap_sim_response_reauth(data, id, 1, eattr.nonce_s);
1052 os_free(decrypted);
1053
1054 return res;
1055 }
1056 data->counter = eattr.counter;
1057
1058 os_memcpy(data->nonce_s, eattr.nonce_s, EAP_SIM_NONCE_S_LEN);
1059 wpa_hexdump(MSG_DEBUG, "EAP-SIM: (encr) AT_NONCE_S",
1060 data->nonce_s, EAP_SIM_NONCE_S_LEN);
1061
1062 eap_sim_derive_keys_reauth(data->counter,
1063 data->reauth_id, data->reauth_id_len,
1064 data->nonce_s, data->mk, data->msk,
1065 data->emsk);
1066 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
1067 eap_sim_learn_ids(sm, data, &eattr);
1068
1069 if (data->result_ind && attr->result_ind)
1070 data->use_result_ind = 1;
1071
1072 if (data->state != FAILURE) {
1073 eap_sim_state(data, data->use_result_ind ?
1074 RESULT_SUCCESS : SUCCESS);
1075 }
1076
1077 data->num_id_req = 0;
1078 data->num_notification = 0;
1079 if (data->counter > EAP_SIM_MAX_FAST_REAUTHS) {
1080 wpa_printf(MSG_DEBUG, "EAP-SIM: Maximum number of "
1081 "fast reauths performed - force fullauth");
1082 eap_sim_clear_identities(sm, data,
1083 CLEAR_REAUTH_ID | CLEAR_EAP_ID);
1084 }
1085 os_free(decrypted);
1086 return eap_sim_response_reauth(data, id, 0, data->nonce_s);
1087 }
1088
1089
eap_sim_process(struct eap_sm * sm,void * priv,struct eap_method_ret * ret,const struct wpabuf * reqData)1090 static struct wpabuf * eap_sim_process(struct eap_sm *sm, void *priv,
1091 struct eap_method_ret *ret,
1092 const struct wpabuf *reqData)
1093 {
1094 struct eap_sim_data *data = priv;
1095 const struct eap_hdr *req;
1096 u8 subtype, id;
1097 struct wpabuf *res;
1098 const u8 *pos;
1099 struct eap_sim_attrs attr;
1100 size_t len;
1101
1102 wpa_hexdump_buf(MSG_DEBUG, "EAP-SIM: EAP data", reqData);
1103 if (eap_get_config_identity(sm, &len) == NULL) {
1104 wpa_printf(MSG_INFO, "EAP-SIM: Identity not configured");
1105 eap_sm_request_identity(sm);
1106 ret->ignore = true;
1107 return NULL;
1108 }
1109
1110 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_SIM, reqData, &len);
1111 if (pos == NULL || len < 3) {
1112 ret->ignore = true;
1113 return NULL;
1114 }
1115 req = wpabuf_head(reqData);
1116 id = req->identifier;
1117 len = be_to_host16(req->length);
1118
1119 ret->ignore = false;
1120 ret->methodState = METHOD_MAY_CONT;
1121 ret->decision = DECISION_FAIL;
1122 ret->allowNotifications = true;
1123
1124 subtype = *pos++;
1125 wpa_printf(MSG_DEBUG, "EAP-SIM: Subtype=%d", subtype);
1126 pos += 2; /* Reserved */
1127
1128 if (eap_sim_parse_attr(pos, wpabuf_head_u8(reqData) + len, &attr, 0,
1129 0)) {
1130 res = eap_sim_client_error(data, id,
1131 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1132 goto done;
1133 }
1134
1135 switch (subtype) {
1136 case EAP_SIM_SUBTYPE_START:
1137 res = eap_sim_process_start(sm, data, id, &attr);
1138 break;
1139 case EAP_SIM_SUBTYPE_CHALLENGE:
1140 res = eap_sim_process_challenge(sm, data, id, reqData, &attr);
1141 break;
1142 case EAP_SIM_SUBTYPE_NOTIFICATION:
1143 res = eap_sim_process_notification(sm, data, id, reqData,
1144 &attr);
1145 break;
1146 case EAP_SIM_SUBTYPE_REAUTHENTICATION:
1147 res = eap_sim_process_reauthentication(sm, data, id, reqData,
1148 &attr);
1149 break;
1150 case EAP_SIM_SUBTYPE_CLIENT_ERROR:
1151 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Client-Error");
1152 res = eap_sim_client_error(data, id,
1153 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1154 break;
1155 default:
1156 wpa_printf(MSG_DEBUG, "EAP-SIM: Unknown subtype=%d", subtype);
1157 res = eap_sim_client_error(data, id,
1158 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1159 break;
1160 }
1161
1162 done:
1163 if (data->state == FAILURE) {
1164 ret->decision = DECISION_FAIL;
1165 ret->methodState = METHOD_DONE;
1166 } else if (data->state == SUCCESS) {
1167 ret->decision = data->use_result_ind ?
1168 DECISION_UNCOND_SUCC : DECISION_COND_SUCC;
1169 ret->methodState = data->use_result_ind ?
1170 METHOD_DONE : METHOD_MAY_CONT;
1171 } else if (data->state == RESULT_SUCCESS)
1172 ret->methodState = METHOD_CONT;
1173
1174 if (ret->methodState == METHOD_DONE) {
1175 ret->allowNotifications = false;
1176 }
1177
1178 return res;
1179 }
1180
1181
eap_sim_has_reauth_data(struct eap_sm * sm,void * priv)1182 static bool eap_sim_has_reauth_data(struct eap_sm *sm, void *priv)
1183 {
1184 struct eap_sim_data *data = priv;
1185 return data->pseudonym || data->reauth_id;
1186 }
1187
1188
eap_sim_deinit_for_reauth(struct eap_sm * sm,void * priv)1189 static void eap_sim_deinit_for_reauth(struct eap_sm *sm, void *priv)
1190 {
1191 struct eap_sim_data *data = priv;
1192 eap_sim_clear_identities(sm, data, CLEAR_EAP_ID);
1193 data->use_result_ind = 0;
1194 eap_sim_clear_keys(data, 1);
1195 }
1196
1197
eap_sim_init_for_reauth(struct eap_sm * sm,void * priv)1198 static void * eap_sim_init_for_reauth(struct eap_sm *sm, void *priv)
1199 {
1200 struct eap_sim_data *data = priv;
1201 if (random_get_bytes(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) {
1202 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data "
1203 "for NONCE_MT");
1204 eap_sim_deinit(sm, data);
1205 return NULL;
1206 }
1207 data->num_id_req = 0;
1208 data->num_notification = 0;
1209 eap_sim_state(data, CONTINUE);
1210 return priv;
1211 }
1212
1213
eap_sim_get_identity(struct eap_sm * sm,void * priv,size_t * len)1214 static const u8 * eap_sim_get_identity(struct eap_sm *sm, void *priv,
1215 size_t *len)
1216 {
1217 struct eap_sim_data *data = priv;
1218
1219 if (data->reauth_id) {
1220 *len = data->reauth_id_len;
1221 return data->reauth_id;
1222 }
1223
1224 if (data->pseudonym) {
1225 *len = data->pseudonym_len;
1226 return data->pseudonym;
1227 }
1228
1229 return NULL;
1230 }
1231
1232
eap_sim_isKeyAvailable(struct eap_sm * sm,void * priv)1233 static bool eap_sim_isKeyAvailable(struct eap_sm *sm, void *priv)
1234 {
1235 struct eap_sim_data *data = priv;
1236 return data->state == SUCCESS;
1237 }
1238
1239
eap_sim_getKey(struct eap_sm * sm,void * priv,size_t * len)1240 static u8 * eap_sim_getKey(struct eap_sm *sm, void *priv, size_t *len)
1241 {
1242 struct eap_sim_data *data = priv;
1243 u8 *key;
1244
1245 if (data->state != SUCCESS)
1246 return NULL;
1247
1248 key = os_memdup(data->msk, EAP_SIM_KEYING_DATA_LEN);
1249 if (key == NULL)
1250 return NULL;
1251
1252 *len = EAP_SIM_KEYING_DATA_LEN;
1253
1254 return key;
1255 }
1256
1257
eap_sim_get_session_id(struct eap_sm * sm,void * priv,size_t * len)1258 static u8 * eap_sim_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1259 {
1260 struct eap_sim_data *data = priv;
1261 u8 *id;
1262
1263 if (data->state != SUCCESS)
1264 return NULL;
1265
1266 if (!data->reauth)
1267 *len = 1 + data->num_chal * GSM_RAND_LEN + EAP_SIM_NONCE_MT_LEN;
1268 else
1269 *len = 1 + EAP_SIM_NONCE_S_LEN + EAP_SIM_MAC_LEN;
1270 id = os_malloc(*len);
1271 if (id == NULL)
1272 return NULL;
1273
1274 id[0] = EAP_TYPE_SIM;
1275 if (!data->reauth) {
1276 os_memcpy(id + 1, data->rand, data->num_chal * GSM_RAND_LEN);
1277 os_memcpy(id + 1 + data->num_chal * GSM_RAND_LEN,
1278 data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
1279 } else {
1280 os_memcpy(id + 1, data->nonce_s, EAP_SIM_NONCE_S_LEN);
1281 os_memcpy(id + 1 + EAP_SIM_NONCE_S_LEN, data->reauth_mac,
1282 EAP_SIM_MAC_LEN);
1283 }
1284 wpa_hexdump(MSG_DEBUG, "EAP-SIM: Derived Session-Id", id, *len);
1285
1286 return id;
1287 }
1288
1289
eap_sim_get_emsk(struct eap_sm * sm,void * priv,size_t * len)1290 static u8 * eap_sim_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1291 {
1292 struct eap_sim_data *data = priv;
1293 u8 *key;
1294
1295 if (data->state != SUCCESS)
1296 return NULL;
1297
1298 key = os_memdup(data->emsk, EAP_EMSK_LEN);
1299 if (key == NULL)
1300 return NULL;
1301
1302 *len = EAP_EMSK_LEN;
1303
1304 return key;
1305 }
1306
1307
eap_sim_get_error_code(void * priv)1308 static int eap_sim_get_error_code(void *priv)
1309 {
1310 struct eap_sim_data *data = priv;
1311 int current_data_error;
1312
1313 if (!data)
1314 return NO_EAP_METHOD_ERROR;
1315
1316 current_data_error = data->error_code;
1317
1318 /* Now reset for next transaction */
1319 data->error_code = NO_EAP_METHOD_ERROR;
1320
1321 return current_data_error;
1322 }
1323
1324
eap_peer_sim_register(void)1325 int eap_peer_sim_register(void)
1326 {
1327 struct eap_method *eap;
1328
1329 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1330 EAP_VENDOR_IETF, EAP_TYPE_SIM, "SIM");
1331 if (eap == NULL)
1332 return -1;
1333
1334 eap->init = eap_sim_init;
1335 eap->deinit = eap_sim_deinit;
1336 eap->process = eap_sim_process;
1337 eap->isKeyAvailable = eap_sim_isKeyAvailable;
1338 eap->getKey = eap_sim_getKey;
1339 eap->getSessionId = eap_sim_get_session_id;
1340 eap->has_reauth_data = eap_sim_has_reauth_data;
1341 eap->deinit_for_reauth = eap_sim_deinit_for_reauth;
1342 eap->init_for_reauth = eap_sim_init_for_reauth;
1343 eap->get_identity = eap_sim_get_identity;
1344 eap->get_emsk = eap_sim_get_emsk;
1345 eap->get_error_code = eap_sim_get_error_code;
1346
1347 return eap_peer_method_register(eap);
1348 }
1349