1 /*
2 * EAP peer method: EAP-SIM (RFC 4186)
3 * Copyright (c) 2004-2012, Jouni Malinen <[email protected]>
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 "utils/base64.h"
13 #include "pcsc_funcs.h"
14 #include "crypto/crypto.h"
15 #include "crypto/milenage.h"
16 #include "crypto/random.h"
17 #include "eap_peer/eap_i.h"
18 #include "eap_config.h"
19 #include "eap_common/eap_sim_common.h"
20
21
22 struct eap_sim_data {
23 u8 *ver_list;
24 size_t ver_list_len;
25 int selected_version;
26 size_t min_num_chal, num_chal;
27
28 u8 kc[3][EAP_SIM_KC_LEN];
29 u8 sres[3][EAP_SIM_SRES_LEN];
30 u8 nonce_mt[EAP_SIM_NONCE_MT_LEN], nonce_s[EAP_SIM_NONCE_S_LEN];
31 u8 mk[EAP_SIM_MK_LEN];
32 u8 k_aut[EAP_SIM_K_AUT_LEN];
33 u8 k_encr[EAP_SIM_K_ENCR_LEN];
34 u8 msk[EAP_SIM_KEYING_DATA_LEN];
35 u8 emsk[EAP_EMSK_LEN];
36 u8 rand[3][GSM_RAND_LEN];
37 u8 reauth_mac[EAP_SIM_MAC_LEN];
38
39 int num_id_req, num_notification;
40 u8 *pseudonym;
41 size_t pseudonym_len;
42 u8 *reauth_id;
43 size_t reauth_id_len;
44 int reauth;
45 unsigned int counter, counter_too_small;
46 u8 *mk_identity;
47 size_t mk_identity_len;
48 enum {
49 CONTINUE, START_DONE, RESULT_SUCCESS, SUCCESS, FAILURE
50 } state;
51 int result_ind, use_result_ind;
52 int use_pseudonym;
53 int error_code;
54 struct crypto_rsa_key *imsi_privacy_key;
55 };
56
57
58 #ifndef CONFIG_NO_STDOUT_DEBUG
eap_sim_state_txt(int state)59 static const char * eap_sim_state_txt(int state)
60 {
61 switch (state) {
62 case CONTINUE:
63 return "CONTINUE";
64 case START_DONE:
65 return "START_DONE";
66 case RESULT_SUCCESS:
67 return "RESULT_SUCCESS";
68 case SUCCESS:
69 return "SUCCESS";
70 case FAILURE:
71 return "FAILURE";
72 default:
73 return "?";
74 }
75 }
76 #endif /* CONFIG_NO_STDOUT_DEBUG */
77
78
eap_sim_state(struct eap_sim_data * data,int state)79 static void eap_sim_state(struct eap_sim_data *data, int state)
80 {
81 wpa_printf(MSG_DEBUG, "EAP-SIM: %s -> %s",
82 eap_sim_state_txt(data->state),
83 eap_sim_state_txt(state));
84 data->state = state;
85 }
86
87
eap_sim_init(struct eap_sm * sm)88 static void * eap_sim_init(struct eap_sm *sm)
89 {
90 struct eap_sim_data *data;
91 struct eap_peer_config *config = eap_get_config(sm);
92
93 data = os_zalloc(sizeof(*data));
94 if (data == NULL)
95 return NULL;
96
97 if (random_get_bytes(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) {
98 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data "
99 "for NONCE_MT");
100 os_free(data);
101 return NULL;
102 }
103
104 if (config && config->imsi_privacy_cert) {
105 #ifdef CRYPTO_RSA_OAEP_SHA256
106 data->imsi_privacy_key = crypto_rsa_key_read(
107 config->imsi_privacy_cert, false);
108 if (!data->imsi_privacy_key) {
109 wpa_printf(MSG_ERROR,
110 "EAP-SIM: Failed to read/parse IMSI privacy certificate %s",
111 config->imsi_privacy_cert);
112 os_free(data);
113 return NULL;
114 }
115 #else /* CRYPTO_RSA_OAEP_SHA256 */
116 wpa_printf(MSG_ERROR,
117 "EAP-SIM: No support for imsi_privacy_cert in the build");
118 os_free(data);
119 return NULL;
120 #endif /* CRYPTO_RSA_OAEP_SHA256 */
121 }
122
123 /* Zero is a valid error code, so we need to initialize */
124 data->error_code = NO_EAP_METHOD_ERROR;
125
126 data->min_num_chal = 2;
127 if (config && config->phase1) {
128 char *pos = os_strstr(config->phase1, "sim_min_num_chal=");
129 if (pos) {
130 data->min_num_chal = atoi(pos + 17);
131 if (data->min_num_chal < 2 || data->min_num_chal > 3) {
132 wpa_printf(MSG_WARNING, "EAP-SIM: Invalid "
133 "sim_min_num_chal configuration "
134 "(%lu, expected 2 or 3)",
135 (unsigned long) data->min_num_chal);
136 #ifdef CRYPTO_RSA_OAEP_SHA256
137 crypto_rsa_key_free(data->imsi_privacy_key);
138 #endif /* CRYPTO_RSA_OAEP_SHA256 */
139 os_free(data);
140 return NULL;
141 }
142 wpa_printf(MSG_DEBUG, "EAP-SIM: Set minimum number of "
143 "challenges to %lu",
144 (unsigned long) data->min_num_chal);
145 }
146
147 data->result_ind = os_strstr(config->phase1, "result_ind=1") !=
148 NULL;
149 }
150
151 data->use_pseudonym = !sm->init_phase2;
152 if (config && config->anonymous_identity && data->use_pseudonym) {
153 data->pseudonym = os_malloc(config->anonymous_identity_len);
154 if (data->pseudonym) {
155 os_memcpy(data->pseudonym, config->anonymous_identity,
156 config->anonymous_identity_len);
157 data->pseudonym_len = config->anonymous_identity_len;
158 }
159 }
160
161 if (sm->identity) {
162 /* Use the EAP-Response/Identity in MK derivation if AT_IDENTITY
163 * is not used. */
164 data->mk_identity = os_memdup(sm->identity, sm->identity_len);
165 data->mk_identity_len = sm->identity_len;
166 }
167
168 eap_sim_state(data, CONTINUE);
169
170 return data;
171 }
172
173
eap_sim_clear_keys(struct eap_sim_data * data,int reauth)174 static void eap_sim_clear_keys(struct eap_sim_data *data, int reauth)
175 {
176 if (!reauth) {
177 os_memset(data->mk, 0, EAP_SIM_MK_LEN);
178 os_memset(data->k_aut, 0, EAP_SIM_K_AUT_LEN);
179 os_memset(data->k_encr, 0, EAP_SIM_K_ENCR_LEN);
180 }
181 os_memset(data->kc, 0, 3 * EAP_SIM_KC_LEN);
182 os_memset(data->sres, 0, 3 * EAP_SIM_SRES_LEN);
183 os_memset(data->msk, 0, EAP_SIM_KEYING_DATA_LEN);
184 os_memset(data->emsk, 0, EAP_EMSK_LEN);
185 }
186
187
eap_sim_deinit(struct eap_sm * sm,void * priv)188 static void eap_sim_deinit(struct eap_sm *sm, void *priv)
189 {
190 struct eap_sim_data *data = priv;
191 if (data) {
192 os_free(data->ver_list);
193 os_free(data->pseudonym);
194 os_free(data->reauth_id);
195 os_free(data->mk_identity);
196 eap_sim_clear_keys(data, 0);
197 #ifdef CRYPTO_RSA_OAEP_SHA256
198 crypto_rsa_key_free(data->imsi_privacy_key);
199 #endif /* CRYPTO_RSA_OAEP_SHA256 */
200 os_free(data);
201 }
202 }
203
204
eap_sim_ext_sim_req(struct eap_sm * sm,struct eap_sim_data * data)205 static int eap_sim_ext_sim_req(struct eap_sm *sm, struct eap_sim_data *data)
206 {
207 char req[200], *pos, *end;
208 size_t i;
209
210 wpa_printf(MSG_DEBUG, "EAP-SIM: Use external SIM processing");
211 pos = req;
212 end = pos + sizeof(req);
213 pos += os_snprintf(pos, end - pos, "GSM-AUTH");
214 for (i = 0; i < data->num_chal; i++) {
215 pos += os_snprintf(pos, end - pos, ":");
216 pos += wpa_snprintf_hex(pos, end - pos, data->rand[i],
217 GSM_RAND_LEN);
218 }
219
220 eap_sm_request_sim(sm, req);
221 return 1;
222 }
223
224
eap_sim_ext_sim_result(struct eap_sm * sm,struct eap_sim_data * data,struct eap_peer_config * conf)225 static int eap_sim_ext_sim_result(struct eap_sm *sm, struct eap_sim_data *data,
226 struct eap_peer_config *conf)
227 {
228 char *resp, *pos;
229 size_t i;
230
231 wpa_printf(MSG_DEBUG,
232 "EAP-SIM: Use result from external SIM processing");
233
234 resp = conf->external_sim_resp;
235 conf->external_sim_resp = NULL;
236
237 if (os_strncmp(resp, "GSM-AUTH:", 9) != 0) {
238 wpa_printf(MSG_DEBUG, "EAP-SIM: Unrecognized external SIM processing response");
239 os_free(resp);
240 return -1;
241 }
242
243 pos = resp + 9;
244 for (i = 0; i < data->num_chal; i++) {
245 wpa_hexdump(MSG_DEBUG, "EAP-SIM: RAND",
246 data->rand[i], GSM_RAND_LEN);
247
248 if (hexstr2bin(pos, data->kc[i], EAP_SIM_KC_LEN) < 0)
249 goto invalid;
250 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: Kc",
251 data->kc[i], EAP_SIM_KC_LEN);
252 pos += EAP_SIM_KC_LEN * 2;
253 if (*pos != ':')
254 goto invalid;
255 pos++;
256
257 if (hexstr2bin(pos, data->sres[i], EAP_SIM_SRES_LEN) < 0)
258 goto invalid;
259 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: SRES",
260 data->sres[i], EAP_SIM_SRES_LEN);
261 pos += EAP_SIM_SRES_LEN * 2;
262 if (i + 1 < data->num_chal) {
263 if (*pos != ':')
264 goto invalid;
265 pos++;
266 }
267 }
268
269 os_free(resp);
270 return 0;
271
272 invalid:
273 wpa_printf(MSG_DEBUG, "EAP-SIM: Invalid external SIM processing GSM-AUTH response");
274 os_free(resp);
275 return -1;
276 }
277
278
eap_sim_gsm_auth(struct eap_sm * sm,struct eap_sim_data * data)279 static int eap_sim_gsm_auth(struct eap_sm *sm, struct eap_sim_data *data)
280 {
281 struct eap_peer_config *conf;
282
283 wpa_printf(MSG_DEBUG, "EAP-SIM: GSM authentication algorithm");
284
285 conf = eap_get_config(sm);
286 if (conf == NULL)
287 return -1;
288
289 if (sm->external_sim) {
290 if (conf->external_sim_resp)
291 return eap_sim_ext_sim_result(sm, data, conf);
292 else
293 return eap_sim_ext_sim_req(sm, data);
294 }
295
296 #ifdef PCSC_FUNCS
297 if (conf->pcsc) {
298 if (scard_gsm_auth(sm->scard_ctx, data->rand[0],
299 data->sres[0], data->kc[0]) ||
300 scard_gsm_auth(sm->scard_ctx, data->rand[1],
301 data->sres[1], data->kc[1]) ||
302 (data->num_chal > 2 &&
303 scard_gsm_auth(sm->scard_ctx, data->rand[2],
304 data->sres[2], data->kc[2]))) {
305 wpa_printf(MSG_DEBUG, "EAP-SIM: GSM SIM "
306 "authentication could not be completed");
307 return -1;
308 }
309 return 0;
310 }
311 #endif /* PCSC_FUNCS */
312
313 #ifdef CONFIG_SIM_SIMULATOR
314 if (conf->password) {
315 u8 opc[16], k[16];
316 const char *pos;
317 size_t i;
318 wpa_printf(MSG_DEBUG, "EAP-SIM: Use internal GSM-Milenage "
319 "implementation for authentication");
320 if (conf->password_len < 65) {
321 wpa_printf(MSG_DEBUG, "EAP-SIM: invalid GSM-Milenage "
322 "password");
323 return -1;
324 }
325 pos = (const char *) conf->password;
326 if (hexstr2bin(pos, k, 16))
327 return -1;
328 pos += 32;
329 if (*pos != ':')
330 return -1;
331 pos++;
332
333 if (hexstr2bin(pos, opc, 16))
334 return -1;
335
336 for (i = 0; i < data->num_chal; i++) {
337 if (gsm_milenage(opc, k, data->rand[i],
338 data->sres[i], data->kc[i])) {
339 wpa_printf(MSG_DEBUG, "EAP-SIM: "
340 "GSM-Milenage authentication "
341 "could not be completed");
342 return -1;
343 }
344 wpa_hexdump(MSG_DEBUG, "EAP-SIM: RAND",
345 data->rand[i], GSM_RAND_LEN);
346 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: SRES",
347 data->sres[i], EAP_SIM_SRES_LEN);
348 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: Kc",
349 data->kc[i], EAP_SIM_KC_LEN);
350 }
351 return 0;
352 }
353 #endif /* CONFIG_SIM_SIMULATOR */
354
355 #ifdef CONFIG_SIM_HARDCODED
356 /* These hardcoded Kc and SRES values are used for testing. RAND to
357 * KC/SREC mapping is very bogus as far as real authentication is
358 * concerned, but it is quite useful for cases where the AS is rotating
359 * the order of pre-configured values. */
360 {
361 size_t i;
362
363 wpa_printf(MSG_DEBUG, "EAP-SIM: Use hardcoded Kc and SRES "
364 "values for testing");
365
366 for (i = 0; i < data->num_chal; i++) {
367 if (data->rand[i][0] == 0xaa) {
368 os_memcpy(data->kc[i],
369 "\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7",
370 EAP_SIM_KC_LEN);
371 os_memcpy(data->sres[i], "\xd1\xd2\xd3\xd4",
372 EAP_SIM_SRES_LEN);
373 } else if (data->rand[i][0] == 0xbb) {
374 os_memcpy(data->kc[i],
375 "\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7",
376 EAP_SIM_KC_LEN);
377 os_memcpy(data->sres[i], "\xe1\xe2\xe3\xe4",
378 EAP_SIM_SRES_LEN);
379 } else {
380 os_memcpy(data->kc[i],
381 "\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7",
382 EAP_SIM_KC_LEN);
383 os_memcpy(data->sres[i], "\xf1\xf2\xf3\xf4",
384 EAP_SIM_SRES_LEN);
385 }
386 }
387 }
388
389 return 0;
390
391 #else /* CONFIG_SIM_HARDCODED */
392
393 wpa_printf(MSG_DEBUG, "EAP-SIM: No GSM authentication algorithm "
394 "enabled");
395 return -1;
396
397 #endif /* CONFIG_SIM_HARDCODED */
398 }
399
400
eap_sim_supported_ver(int version)401 static int eap_sim_supported_ver(int version)
402 {
403 return version == EAP_SIM_VERSION;
404 }
405
406
407 #define CLEAR_PSEUDONYM 0x01
408 #define CLEAR_REAUTH_ID 0x02
409
eap_sim_clear_identities(struct eap_sm * sm,struct eap_sim_data * data,int id)410 static void eap_sim_clear_identities(struct eap_sm *sm,
411 struct eap_sim_data *data, int id)
412 {
413 if ((id & CLEAR_PSEUDONYM) && data->pseudonym) {
414 wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old pseudonym");
415 os_free(data->pseudonym);
416 data->pseudonym = NULL;
417 data->pseudonym_len = 0;
418 if (data->use_pseudonym)
419 eap_set_anon_id(sm, NULL, 0);
420 }
421 if ((id & CLEAR_REAUTH_ID) && data->reauth_id) {
422 wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old reauth_id");
423 os_free(data->reauth_id);
424 data->reauth_id = NULL;
425 data->reauth_id_len = 0;
426 }
427 }
428
429
eap_sim_learn_ids(struct eap_sm * sm,struct eap_sim_data * data,struct eap_sim_attrs * attr)430 static int eap_sim_learn_ids(struct eap_sm *sm, struct eap_sim_data *data,
431 struct eap_sim_attrs *attr)
432 {
433 if (attr->next_pseudonym) {
434 const u8 *identity = NULL;
435 size_t identity_len = 0;
436 const u8 *realm = NULL;
437 size_t realm_len = 0;
438
439 wpa_hexdump_ascii(MSG_DEBUG,
440 "EAP-SIM: (encr) AT_NEXT_PSEUDONYM",
441 attr->next_pseudonym,
442 attr->next_pseudonym_len);
443 os_free(data->pseudonym);
444
445 /* Get realm from identities to decorate pseudonym. */
446 realm = eap_get_config_realm(sm, &realm_len);
447
448 data->pseudonym = os_malloc(attr->next_pseudonym_len +
449 realm_len);
450 if (data->pseudonym == NULL) {
451 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No memory for "
452 "next pseudonym");
453 data->pseudonym_len = 0;
454 return -1;
455 }
456 os_memcpy(data->pseudonym, attr->next_pseudonym,
457 attr->next_pseudonym_len);
458 if (realm_len) {
459 os_memcpy(data->pseudonym + attr->next_pseudonym_len,
460 realm, realm_len);
461 }
462 data->pseudonym_len = attr->next_pseudonym_len + realm_len;
463 if (data->use_pseudonym)
464 eap_set_anon_id(sm, data->pseudonym,
465 data->pseudonym_len);
466 }
467
468 if (attr->next_reauth_id) {
469 os_free(data->reauth_id);
470 data->reauth_id = os_memdup(attr->next_reauth_id,
471 attr->next_reauth_id_len);
472 if (data->reauth_id == NULL) {
473 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No memory for "
474 "next reauth_id");
475 data->reauth_id_len = 0;
476 return -1;
477 }
478 data->reauth_id_len = attr->next_reauth_id_len;
479 wpa_hexdump_ascii(MSG_DEBUG,
480 "EAP-SIM: (encr) AT_NEXT_REAUTH_ID",
481 data->reauth_id,
482 data->reauth_id_len);
483 }
484
485 return 0;
486 }
487
488
eap_sim_client_error(struct eap_sim_data * data,u8 id,int err)489 static struct wpabuf * eap_sim_client_error(struct eap_sim_data *data, u8 id,
490 int err)
491 {
492 struct eap_sim_msg *msg;
493
494 eap_sim_state(data, FAILURE);
495 data->num_id_req = 0;
496 data->num_notification = 0;
497
498 wpa_printf(MSG_DEBUG, "EAP-SIM: Send Client-Error (error code %d)",
499 err);
500 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
501 EAP_SIM_SUBTYPE_CLIENT_ERROR);
502 eap_sim_msg_add(msg, EAP_SIM_AT_CLIENT_ERROR_CODE, err, NULL, 0);
503 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, NULL, NULL, 0);
504 }
505
506
507 #ifdef CRYPTO_RSA_OAEP_SHA256
508 static struct wpabuf *
eap_sim_encrypt_identity(struct crypto_rsa_key * imsi_privacy_key,const u8 * identity,size_t identity_len,const char * attr)509 eap_sim_encrypt_identity(struct crypto_rsa_key *imsi_privacy_key,
510 const u8 *identity, size_t identity_len,
511 const char *attr)
512 {
513 struct wpabuf *imsi_buf, *enc;
514 char *b64;
515 size_t b64_len, len;
516
517 wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM: Encrypt permanent identity",
518 identity, identity_len);
519
520 imsi_buf = wpabuf_alloc_copy(identity, identity_len);
521 if (!imsi_buf)
522 return NULL;
523 enc = crypto_rsa_oaep_sha256_encrypt(imsi_privacy_key, imsi_buf);
524 wpabuf_free(imsi_buf);
525 if (!enc)
526 return NULL;
527
528 b64 = base64_encode_no_lf(wpabuf_head(enc), wpabuf_len(enc), &b64_len);
529 wpabuf_free(enc);
530 if (!b64)
531 return NULL;
532
533 len = 1 + b64_len;
534 if (attr)
535 len += 1 + os_strlen(attr);
536 enc = wpabuf_alloc(len);
537 if (!enc) {
538 os_free(b64);
539 return NULL;
540 }
541 wpabuf_put_u8(enc, '\0');
542 wpabuf_put_data(enc, b64, b64_len);
543 os_free(b64);
544 if (attr) {
545 wpabuf_put_u8(enc, ',');
546 wpabuf_put_str(enc, attr);
547 }
548 wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM: Encrypted permanent identity",
549 wpabuf_head(enc), wpabuf_len(enc));
550
551 return enc;
552 }
553 #endif /* CRYPTO_RSA_OAEP_SHA256 */
554
555
eap_sim_response_start(struct eap_sm * sm,struct eap_sim_data * data,u8 id,enum eap_sim_id_req id_req)556 static struct wpabuf * eap_sim_response_start(struct eap_sm *sm,
557 struct eap_sim_data *data, u8 id,
558 enum eap_sim_id_req id_req)
559 {
560 const u8 *identity = NULL;
561 size_t identity_len = 0;
562 struct eap_sim_msg *msg;
563 struct wpabuf *resp;
564 struct wpabuf *enc_identity = NULL;
565 struct eap_peer_config *config = NULL;
566 bool use_imsi_identity = false;
567
568 data->reauth = 0;
569 if (id_req == ANY_ID && data->reauth_id) {
570 identity = data->reauth_id;
571 identity_len = data->reauth_id_len;
572 data->reauth = 1;
573 } else if ((id_req == ANY_ID || id_req == FULLAUTH_ID) &&
574 data->pseudonym &&
575 !eap_sim_anonymous_username(data->pseudonym,
576 data->pseudonym_len)) {
577 identity = data->pseudonym;
578 identity_len = data->pseudonym_len;
579 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID);
580 } else if (id_req != NO_ID_REQ) {
581 if (id_req == PERMANENT_ID && eap_get_config_strict_conservative_peer_mode(sm)) {
582 wpa_printf(MSG_INFO, "EAP-SIM: permanent_id_req is denied in "
583 "the strict conservative peer mode");
584 eap_notify_permanent_id_req_denied(sm);
585 return eap_sim_client_error(data, id, EAP_SIM_UNABLE_TO_PROCESS_PACKET);
586 }
587 identity = eap_get_config_identity(sm, &identity_len);
588 if (identity) {
589 int ids = CLEAR_PSEUDONYM | CLEAR_REAUTH_ID;
590
591 if (data->pseudonym &&
592 eap_sim_anonymous_username(data->pseudonym,
593 data->pseudonym_len))
594 ids &= ~CLEAR_PSEUDONYM;
595 eap_sim_clear_identities(sm, data, ids);
596
597 config = eap_get_config(sm);
598 if (config && config->imsi_identity)
599 use_imsi_identity = true;
600 }
601 #ifdef CRYPTO_RSA_OAEP_SHA256
602 if (identity && data->imsi_privacy_key) {
603 const char *attr = NULL;
604
605 config = eap_get_config(sm);
606 if (config)
607 attr = config->imsi_privacy_attr;
608 enc_identity = eap_sim_encrypt_identity(
609 data->imsi_privacy_key,
610 identity, identity_len, attr);
611 if (!enc_identity) {
612 wpa_printf(MSG_INFO,
613 "EAP-SIM: Failed to encrypt permanent identity");
614 return eap_sim_client_error(
615 data, id,
616 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
617 }
618 /* Use the real identity, not the encrypted one, in MK
619 * derivation. */
620 os_free(data->mk_identity);
621 data->mk_identity = os_memdup(identity, identity_len);
622 data->mk_identity_len = identity_len;
623 identity = wpabuf_head(enc_identity);
624 identity_len = wpabuf_len(enc_identity);
625 }
626 #endif /* CRYPTO_RSA_OAEP_SHA256 */
627 }
628
629 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Start (id=%d)", id);
630 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id,
631 EAP_TYPE_SIM, EAP_SIM_SUBTYPE_START);
632 if (identity) {
633 wpa_hexdump_ascii(MSG_DEBUG, " AT_IDENTITY",
634 identity, identity_len);
635 eap_sim_msg_add(msg, EAP_SIM_AT_IDENTITY, identity_len,
636 identity, identity_len);
637 if (use_imsi_identity && config && config->imsi_identity) {
638 /* Use the IMSI identity override, i.e., the not
639 * encrypted one, in MK derivation, when using
640 * externally encrypted identity in configuration. */
641 os_free(data->mk_identity);
642 data->mk_identity = os_memdup(
643 config->imsi_identity,
644 config->imsi_identity_len);
645 data->mk_identity_len = config->imsi_identity_len;
646 } else if (!enc_identity) {
647 /* Use the last AT_IDENTITY value as the identity in
648 * MK derivation. */
649 os_free(data->mk_identity);
650 data->mk_identity = os_memdup(identity, identity_len);
651 data->mk_identity_len = identity_len;
652 }
653 }
654 wpabuf_free(enc_identity);
655 if (!data->reauth) {
656 wpa_hexdump(MSG_DEBUG, " AT_NONCE_MT",
657 data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
658 eap_sim_msg_add(msg, EAP_SIM_AT_NONCE_MT, 0,
659 data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
660 wpa_printf(MSG_DEBUG, " AT_SELECTED_VERSION %d",
661 data->selected_version);
662 eap_sim_msg_add(msg, EAP_SIM_AT_SELECTED_VERSION,
663 data->selected_version, NULL, 0);
664 }
665
666 resp = eap_sim_msg_finish(msg, EAP_TYPE_SIM, NULL, NULL, 0);
667 if (resp)
668 eap_sim_state(data, START_DONE);
669 return resp;
670 }
671
672
eap_sim_response_challenge(struct eap_sim_data * data,u8 id)673 static struct wpabuf * eap_sim_response_challenge(struct eap_sim_data *data,
674 u8 id)
675 {
676 struct eap_sim_msg *msg;
677
678 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Challenge (id=%d)", id);
679 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
680 EAP_SIM_SUBTYPE_CHALLENGE);
681 if (data->use_result_ind) {
682 wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
683 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
684 }
685 wpa_printf(MSG_DEBUG, " AT_MAC");
686 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
687 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, data->k_aut,
688 (u8 *) data->sres,
689 data->num_chal * EAP_SIM_SRES_LEN);
690 }
691
692
eap_sim_response_reauth(struct eap_sim_data * data,u8 id,int counter_too_small,const u8 * nonce_s)693 static struct wpabuf * eap_sim_response_reauth(struct eap_sim_data *data,
694 u8 id, int counter_too_small,
695 const u8 *nonce_s)
696 {
697 struct eap_sim_msg *msg;
698 unsigned int counter;
699
700 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Reauthentication (id=%d)",
701 id);
702 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
703 EAP_SIM_SUBTYPE_REAUTHENTICATION);
704 wpa_printf(MSG_DEBUG, " AT_IV");
705 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
706 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA);
707
708 if (counter_too_small) {
709 wpa_printf(MSG_DEBUG, " *AT_COUNTER_TOO_SMALL");
710 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER_TOO_SMALL, 0, NULL, 0);
711 counter = data->counter_too_small;
712 } else
713 counter = data->counter;
714
715 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", counter);
716 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0);
717
718 if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) {
719 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt "
720 "AT_ENCR_DATA");
721 eap_sim_msg_free(msg);
722 return NULL;
723 }
724 if (data->use_result_ind) {
725 wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
726 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
727 }
728 wpa_printf(MSG_DEBUG, " AT_MAC");
729 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
730 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, data->k_aut, nonce_s,
731 EAP_SIM_NONCE_S_LEN);
732 }
733
734
eap_sim_response_notification(struct eap_sim_data * data,u8 id,u16 notification)735 static struct wpabuf * eap_sim_response_notification(struct eap_sim_data *data,
736 u8 id, u16 notification)
737 {
738 struct eap_sim_msg *msg;
739 u8 *k_aut = (notification & 0x4000) == 0 ? data->k_aut : NULL;
740
741 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Notification (id=%d)", id);
742 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id,
743 EAP_TYPE_SIM, EAP_SIM_SUBTYPE_NOTIFICATION);
744 if (k_aut && data->reauth) {
745 wpa_printf(MSG_DEBUG, " AT_IV");
746 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
747 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV,
748 EAP_SIM_AT_ENCR_DATA);
749 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", data->counter);
750 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter,
751 NULL, 0);
752 if (eap_sim_msg_add_encr_end(msg, data->k_encr,
753 EAP_SIM_AT_PADDING)) {
754 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt "
755 "AT_ENCR_DATA");
756 eap_sim_msg_free(msg);
757 return NULL;
758 }
759 }
760 if (k_aut) {
761 wpa_printf(MSG_DEBUG, " AT_MAC");
762 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
763 }
764 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, k_aut, (u8 *) "", 0);
765 }
766
767
eap_sim_process_start(struct eap_sm * sm,struct eap_sim_data * data,u8 id,struct eap_sim_attrs * attr)768 static struct wpabuf * eap_sim_process_start(struct eap_sm *sm,
769 struct eap_sim_data *data, u8 id,
770 struct eap_sim_attrs *attr)
771 {
772 int selected_version = -1, id_error;
773 size_t i;
774 u8 *pos;
775
776 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Start");
777 if (attr->version_list == NULL) {
778 wpa_printf(MSG_INFO, "EAP-SIM: No AT_VERSION_LIST in "
779 "SIM/Start");
780 return eap_sim_client_error(data, id,
781 EAP_SIM_UNSUPPORTED_VERSION);
782 }
783
784 os_free(data->ver_list);
785 data->ver_list = os_memdup(attr->version_list, attr->version_list_len);
786 if (data->ver_list == NULL) {
787 wpa_printf(MSG_DEBUG, "EAP-SIM: Failed to allocate "
788 "memory for version list");
789 return eap_sim_client_error(data, id,
790 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
791 }
792 data->ver_list_len = attr->version_list_len;
793 pos = data->ver_list;
794 for (i = 0; i < data->ver_list_len / 2; i++) {
795 int ver = pos[0] * 256 + pos[1];
796 pos += 2;
797 if (eap_sim_supported_ver(ver)) {
798 selected_version = ver;
799 break;
800 }
801 }
802 if (selected_version < 0) {
803 wpa_printf(MSG_INFO, "EAP-SIM: Could not find a supported "
804 "version");
805 return eap_sim_client_error(data, id,
806 EAP_SIM_UNSUPPORTED_VERSION);
807 }
808 wpa_printf(MSG_DEBUG, "EAP-SIM: Selected Version %d",
809 selected_version);
810 data->selected_version = selected_version;
811
812 id_error = 0;
813 switch (attr->id_req) {
814 case NO_ID_REQ:
815 break;
816 case ANY_ID:
817 if (data->num_id_req > 0)
818 id_error++;
819 data->num_id_req++;
820 break;
821 case FULLAUTH_ID:
822 if (data->num_id_req > 1)
823 id_error++;
824 data->num_id_req++;
825 break;
826 case PERMANENT_ID:
827 if (data->num_id_req > 2)
828 id_error++;
829 data->num_id_req++;
830 break;
831 }
832 if (id_error) {
833 wpa_printf(MSG_INFO, "EAP-SIM: Too many ID requests "
834 "used within one authentication");
835 return eap_sim_client_error(data, id,
836 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
837 }
838
839 return eap_sim_response_start(sm, data, id, attr->id_req);
840 }
841
842
eap_sim_process_challenge(struct eap_sm * sm,struct eap_sim_data * data,u8 id,const struct wpabuf * reqData,struct eap_sim_attrs * attr)843 static struct wpabuf * eap_sim_process_challenge(struct eap_sm *sm,
844 struct eap_sim_data *data,
845 u8 id,
846 const struct wpabuf *reqData,
847 struct eap_sim_attrs *attr)
848 {
849 const u8 *identity;
850 size_t identity_len;
851 struct eap_sim_attrs eattr;
852 int res;
853
854 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Challenge");
855 if (data->state != START_DONE) {
856 wpa_printf(MSG_DEBUG,
857 "EAP-SIM: Unexpected Challenge in state %s",
858 eap_sim_state_txt(data->state));
859 return eap_sim_client_error(data, id,
860 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
861 }
862 data->reauth = 0;
863 if (!attr->mac || !attr->rand) {
864 wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message "
865 "did not include%s%s",
866 !attr->mac ? " AT_MAC" : "",
867 !attr->rand ? " AT_RAND" : "");
868 return eap_sim_client_error(data, id,
869 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
870 }
871
872 wpa_printf(MSG_DEBUG, "EAP-SIM: %lu challenges",
873 (unsigned long) attr->num_chal);
874 if (attr->num_chal < data->min_num_chal) {
875 wpa_printf(MSG_INFO, "EAP-SIM: Insufficient number of "
876 "challenges (%lu)", (unsigned long) attr->num_chal);
877 return eap_sim_client_error(data, id,
878 EAP_SIM_INSUFFICIENT_NUM_OF_CHAL);
879 }
880 if (attr->num_chal > 3) {
881 wpa_printf(MSG_INFO, "EAP-SIM: Too many challenges "
882 "(%lu)", (unsigned long) attr->num_chal);
883 return eap_sim_client_error(data, id,
884 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
885 }
886
887 /* Verify that RANDs are different */
888 if (os_memcmp(attr->rand, attr->rand + GSM_RAND_LEN,
889 GSM_RAND_LEN) == 0 ||
890 (attr->num_chal > 2 &&
891 (os_memcmp(attr->rand, attr->rand + 2 * GSM_RAND_LEN,
892 GSM_RAND_LEN) == 0 ||
893 os_memcmp(attr->rand + GSM_RAND_LEN,
894 attr->rand + 2 * GSM_RAND_LEN,
895 GSM_RAND_LEN) == 0))) {
896 wpa_printf(MSG_INFO, "EAP-SIM: Same RAND used multiple times");
897 return eap_sim_client_error(data, id,
898 EAP_SIM_RAND_NOT_FRESH);
899 }
900
901 os_memcpy(data->rand, attr->rand, attr->num_chal * GSM_RAND_LEN);
902 data->num_chal = attr->num_chal;
903
904 res = eap_sim_gsm_auth(sm, data);
905 if (res > 0) {
906 wpa_printf(MSG_DEBUG, "EAP-SIM: Wait for external SIM processing");
907 return NULL;
908 }
909 if (res) {
910 wpa_printf(MSG_WARNING, "EAP-SIM: GSM authentication failed");
911 return eap_sim_client_error(data, id,
912 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
913 }
914
915 identity = data->mk_identity;
916 identity_len = data->mk_identity_len;
917 wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM: Selected identity for MK "
918 "derivation", identity, identity_len);
919 eap_sim_derive_mk(identity, identity_len, data->nonce_mt,
920 data->selected_version, data->ver_list,
921 data->ver_list_len, data->num_chal,
922 (const u8 *) data->kc, data->mk);
923 eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut, data->msk,
924 data->emsk);
925 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, data->nonce_mt,
926 EAP_SIM_NONCE_MT_LEN)) {
927 wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message "
928 "used invalid AT_MAC");
929 #ifdef TEST_FUZZ
930 wpa_printf(MSG_INFO,
931 "TEST: Ignore AT_MAC mismatch for fuzz testing");
932 #else /* TEST_FUZZ */
933 return eap_sim_client_error(data, id,
934 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
935 #endif /* TEST_FUZZ */
936 }
937
938 /* Old reauthentication identity must not be used anymore. In
939 * other words, if no new reauth identity is received, full
940 * authentication will be used on next reauthentication (using
941 * pseudonym identity or permanent identity). */
942 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID);
943
944 if (attr->encr_data) {
945 u8 *decrypted;
946 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
947 attr->encr_data_len, attr->iv,
948 &eattr, 0);
949 if (decrypted == NULL) {
950 return eap_sim_client_error(
951 data, id, EAP_SIM_UNABLE_TO_PROCESS_PACKET);
952 }
953 eap_sim_learn_ids(sm, data, &eattr);
954 os_free(decrypted);
955 }
956
957 if (data->result_ind && attr->result_ind)
958 data->use_result_ind = 1;
959
960 if (data->state != FAILURE) {
961 eap_sim_state(data, data->use_result_ind ?
962 RESULT_SUCCESS : SUCCESS);
963 }
964
965 data->num_id_req = 0;
966 data->num_notification = 0;
967 /* RFC 4186 specifies that counter is initialized to one after
968 * fullauth, but initializing it to zero makes it easier to implement
969 * reauth verification. */
970 data->counter = 0;
971 return eap_sim_response_challenge(data, id);
972 }
973
974
eap_sim_process_notification_reauth(struct eap_sim_data * data,struct eap_sim_attrs * attr)975 static int eap_sim_process_notification_reauth(struct eap_sim_data *data,
976 struct eap_sim_attrs *attr)
977 {
978 struct eap_sim_attrs eattr;
979 u8 *decrypted;
980
981 if (attr->encr_data == NULL || attr->iv == NULL) {
982 wpa_printf(MSG_WARNING, "EAP-SIM: Notification message after "
983 "reauth did not include encrypted data");
984 return -1;
985 }
986
987 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
988 attr->encr_data_len, attr->iv, &eattr,
989 0);
990 if (decrypted == NULL) {
991 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted "
992 "data from notification message");
993 return -1;
994 }
995
996 if (eattr.counter < 0 || (size_t) eattr.counter != data->counter) {
997 wpa_printf(MSG_WARNING, "EAP-SIM: Counter in notification "
998 "message does not match with counter in reauth "
999 "message");
1000 os_free(decrypted);
1001 return -1;
1002 }
1003
1004 os_free(decrypted);
1005 return 0;
1006 }
1007
1008
eap_sim_process_notification_auth(struct eap_sim_data * data,const struct wpabuf * reqData,struct eap_sim_attrs * attr)1009 static int eap_sim_process_notification_auth(struct eap_sim_data *data,
1010 const struct wpabuf *reqData,
1011 struct eap_sim_attrs *attr)
1012 {
1013 if (attr->mac == NULL) {
1014 wpa_printf(MSG_INFO, "EAP-SIM: no AT_MAC in after_auth "
1015 "Notification message");
1016 return -1;
1017 }
1018
1019 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
1020 {
1021 wpa_printf(MSG_WARNING, "EAP-SIM: Notification message "
1022 "used invalid AT_MAC");
1023 return -1;
1024 }
1025
1026 if (data->reauth &&
1027 eap_sim_process_notification_reauth(data, attr)) {
1028 wpa_printf(MSG_WARNING, "EAP-SIM: Invalid notification "
1029 "message after reauth");
1030 return -1;
1031 }
1032
1033 return 0;
1034 }
1035
1036
eap_sim_process_notification(struct eap_sm * sm,struct eap_sim_data * data,u8 id,const struct wpabuf * reqData,struct eap_sim_attrs * attr)1037 static struct wpabuf * eap_sim_process_notification(
1038 struct eap_sm *sm, struct eap_sim_data *data, u8 id,
1039 const struct wpabuf *reqData, struct eap_sim_attrs *attr)
1040 {
1041 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Notification");
1042 if (data->num_notification > 0) {
1043 wpa_printf(MSG_INFO, "EAP-SIM: too many notification "
1044 "rounds (only one allowed)");
1045 return eap_sim_client_error(data, id,
1046 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1047 }
1048 data->num_notification++;
1049 if (attr->notification == -1) {
1050 wpa_printf(MSG_INFO, "EAP-SIM: no AT_NOTIFICATION in "
1051 "Notification message");
1052 return eap_sim_client_error(data, id,
1053 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1054 }
1055
1056 if ((attr->notification & 0x4000) == 0 &&
1057 eap_sim_process_notification_auth(data, reqData, attr)) {
1058 return eap_sim_client_error(data, id,
1059 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1060 }
1061
1062 eap_sim_report_notification(sm->msg_ctx, attr->notification, 0);
1063 if (attr->notification >= 0 && attr->notification < 32768) {
1064 data->error_code = attr->notification;
1065 eap_sim_state(data, FAILURE);
1066 } else if (attr->notification == EAP_SIM_SUCCESS &&
1067 data->state == RESULT_SUCCESS)
1068 eap_sim_state(data, SUCCESS);
1069 return eap_sim_response_notification(data, id, attr->notification);
1070 }
1071
1072
eap_sim_process_reauthentication(struct eap_sm * sm,struct eap_sim_data * data,u8 id,const struct wpabuf * reqData,struct eap_sim_attrs * attr)1073 static struct wpabuf * eap_sim_process_reauthentication(
1074 struct eap_sm *sm, struct eap_sim_data *data, u8 id,
1075 const struct wpabuf *reqData, struct eap_sim_attrs *attr)
1076 {
1077 struct eap_sim_attrs eattr;
1078 u8 *decrypted;
1079
1080 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Reauthentication");
1081
1082 if (data->reauth_id == NULL) {
1083 wpa_printf(MSG_WARNING, "EAP-SIM: Server is trying "
1084 "reauthentication, but no reauth_id available");
1085 return eap_sim_client_error(data, id,
1086 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1087 }
1088
1089 data->reauth = 1;
1090 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
1091 {
1092 wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication "
1093 "did not have valid AT_MAC");
1094 #ifdef TEST_FUZZ
1095 wpa_printf(MSG_INFO,
1096 "TEST: Ignore AT_MAC mismatch for fuzz testing");
1097 #else /* TEST_FUZZ */
1098 return eap_sim_client_error(data, id,
1099 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1100 #endif /* TEST_FUZZ */
1101 }
1102
1103 /* At this stage the received MAC has been verified. Use this MAC for
1104 * reauth Session-Id calculation if all other checks pass.
1105 * The peer does not use the local MAC but the received MAC in deriving
1106 * Session-Id. */
1107 #ifdef TEST_FUZZ
1108 if (attr->mac)
1109 os_memcpy(data->reauth_mac, attr->mac, EAP_SIM_MAC_LEN);
1110 else
1111 os_memset(data->reauth_mac, 0x12, EAP_SIM_MAC_LEN);
1112 #else /* TEST_FUZZ */
1113 os_memcpy(data->reauth_mac, attr->mac, EAP_SIM_MAC_LEN);
1114 #endif /* TEST_FUZZ */
1115 wpa_hexdump(MSG_DEBUG, "EAP-SIM: Server MAC",
1116 data->reauth_mac, EAP_SIM_MAC_LEN);
1117
1118 if (attr->encr_data == NULL || attr->iv == NULL) {
1119 wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication "
1120 "message did not include encrypted data");
1121 return eap_sim_client_error(data, id,
1122 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1123 }
1124
1125 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
1126 attr->encr_data_len, attr->iv, &eattr,
1127 0);
1128 if (decrypted == NULL) {
1129 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted "
1130 "data from reauthentication message");
1131 return eap_sim_client_error(data, id,
1132 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1133 }
1134
1135 if (eattr.nonce_s == NULL || eattr.counter < 0) {
1136 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No%s%s in reauth packet",
1137 !eattr.nonce_s ? " AT_NONCE_S" : "",
1138 eattr.counter < 0 ? " AT_COUNTER" : "");
1139 os_free(decrypted);
1140 return eap_sim_client_error(data, id,
1141 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1142 }
1143
1144 if (eattr.counter < 0 || (size_t) eattr.counter <= data->counter) {
1145 struct wpabuf *res;
1146 wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid counter "
1147 "(%d <= %d)", eattr.counter, data->counter);
1148 data->counter_too_small = eattr.counter;
1149
1150 /* Reply using Re-auth w/ AT_COUNTER_TOO_SMALL. The current
1151 * reauth_id must not be used to start a new reauthentication.
1152 */
1153 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID);
1154
1155 res = eap_sim_response_reauth(data, id, 1, eattr.nonce_s);
1156 os_free(decrypted);
1157
1158 return res;
1159 }
1160 data->counter = eattr.counter;
1161
1162 os_memcpy(data->nonce_s, eattr.nonce_s, EAP_SIM_NONCE_S_LEN);
1163 wpa_hexdump(MSG_DEBUG, "EAP-SIM: (encr) AT_NONCE_S",
1164 data->nonce_s, EAP_SIM_NONCE_S_LEN);
1165
1166 eap_sim_derive_keys_reauth(data->counter,
1167 data->reauth_id, data->reauth_id_len,
1168 data->nonce_s, data->mk, data->msk,
1169 data->emsk);
1170 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID);
1171 eap_sim_learn_ids(sm, data, &eattr);
1172
1173 if (data->result_ind && attr->result_ind)
1174 data->use_result_ind = 1;
1175
1176 if (data->state != FAILURE) {
1177 eap_sim_state(data, data->use_result_ind ?
1178 RESULT_SUCCESS : SUCCESS);
1179 }
1180
1181 data->num_id_req = 0;
1182 data->num_notification = 0;
1183 if (data->counter > EAP_SIM_MAX_FAST_REAUTHS) {
1184 wpa_printf(MSG_DEBUG, "EAP-SIM: Maximum number of "
1185 "fast reauths performed - force fullauth");
1186 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID);
1187 }
1188 os_free(decrypted);
1189 return eap_sim_response_reauth(data, id, 0, data->nonce_s);
1190 }
1191
1192
eap_sim_process(struct eap_sm * sm,void * priv,struct eap_method_ret * ret,const struct wpabuf * reqData)1193 static struct wpabuf * eap_sim_process(struct eap_sm *sm, void *priv,
1194 struct eap_method_ret *ret,
1195 const struct wpabuf *reqData)
1196 {
1197 struct eap_sim_data *data = priv;
1198 const struct eap_hdr *req;
1199 u8 subtype, id;
1200 struct wpabuf *res;
1201 const u8 *pos;
1202 struct eap_sim_attrs attr;
1203 size_t len;
1204
1205 wpa_hexdump_buf(MSG_DEBUG, "EAP-SIM: EAP data", reqData);
1206 if (eap_get_config_identity(sm, &len) == NULL) {
1207 wpa_printf(MSG_INFO, "EAP-SIM: Identity not configured");
1208 eap_sm_request_identity(sm);
1209 ret->ignore = true;
1210 return NULL;
1211 }
1212
1213 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_SIM, reqData, &len);
1214 if (pos == NULL || len < 3) {
1215 ret->ignore = true;
1216 return NULL;
1217 }
1218 req = wpabuf_head(reqData);
1219 id = req->identifier;
1220 len = be_to_host16(req->length);
1221
1222 ret->ignore = false;
1223 ret->methodState = METHOD_MAY_CONT;
1224 ret->decision = DECISION_FAIL;
1225 ret->allowNotifications = true;
1226
1227 subtype = *pos++;
1228 wpa_printf(MSG_DEBUG, "EAP-SIM: Subtype=%d", subtype);
1229 pos += 2; /* Reserved */
1230
1231 if (eap_sim_parse_attr(pos, wpabuf_head_u8(reqData) + len, &attr, 0,
1232 0)) {
1233 res = eap_sim_client_error(data, id,
1234 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1235 goto done;
1236 }
1237
1238 switch (subtype) {
1239 case EAP_SIM_SUBTYPE_START:
1240 res = eap_sim_process_start(sm, data, id, &attr);
1241 break;
1242 case EAP_SIM_SUBTYPE_CHALLENGE:
1243 res = eap_sim_process_challenge(sm, data, id, reqData, &attr);
1244 break;
1245 case EAP_SIM_SUBTYPE_NOTIFICATION:
1246 res = eap_sim_process_notification(sm, data, id, reqData,
1247 &attr);
1248 break;
1249 case EAP_SIM_SUBTYPE_REAUTHENTICATION:
1250 res = eap_sim_process_reauthentication(sm, data, id, reqData,
1251 &attr);
1252 break;
1253 case EAP_SIM_SUBTYPE_CLIENT_ERROR:
1254 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Client-Error");
1255 res = eap_sim_client_error(data, id,
1256 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1257 break;
1258 default:
1259 wpa_printf(MSG_DEBUG, "EAP-SIM: Unknown subtype=%d", subtype);
1260 res = eap_sim_client_error(data, id,
1261 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1262 break;
1263 }
1264
1265 done:
1266 if (data->state == FAILURE) {
1267 ret->decision = DECISION_FAIL;
1268 ret->methodState = METHOD_DONE;
1269 } else if (data->state == SUCCESS) {
1270 ret->decision = data->use_result_ind ?
1271 DECISION_UNCOND_SUCC : DECISION_COND_SUCC;
1272 ret->methodState = data->use_result_ind ?
1273 METHOD_DONE : METHOD_MAY_CONT;
1274 } else if (data->state == RESULT_SUCCESS)
1275 ret->methodState = METHOD_CONT;
1276
1277 if (ret->methodState == METHOD_DONE) {
1278 ret->allowNotifications = false;
1279 }
1280
1281 return res;
1282 }
1283
1284
eap_sim_has_reauth_data(struct eap_sm * sm,void * priv)1285 static bool eap_sim_has_reauth_data(struct eap_sm *sm, void *priv)
1286 {
1287 struct eap_sim_data *data = priv;
1288 return data->pseudonym || data->reauth_id;
1289 }
1290
1291
eap_sim_deinit_for_reauth(struct eap_sm * sm,void * priv)1292 static void eap_sim_deinit_for_reauth(struct eap_sm *sm, void *priv)
1293 {
1294 struct eap_sim_data *data = priv;
1295
1296 os_free(data->mk_identity);
1297 data->mk_identity = NULL;
1298 data->mk_identity_len = 0;
1299 data->use_result_ind = 0;
1300 eap_sim_clear_keys(data, 1);
1301 }
1302
1303
eap_sim_init_for_reauth(struct eap_sm * sm,void * priv)1304 static void * eap_sim_init_for_reauth(struct eap_sm *sm, void *priv)
1305 {
1306 struct eap_sim_data *data = priv;
1307 if (random_get_bytes(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) {
1308 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data "
1309 "for NONCE_MT");
1310 eap_sim_deinit(sm, data);
1311 return NULL;
1312 }
1313
1314 if (sm->identity) {
1315 /* Use the EAP-Response/Identity in MK derivation if AT_IDENTITY
1316 * is not used. */
1317 os_free(data->mk_identity);
1318 data->mk_identity = os_memdup(sm->identity, sm->identity_len);
1319 data->mk_identity_len = sm->identity_len;
1320 }
1321
1322 data->num_id_req = 0;
1323 data->num_notification = 0;
1324 eap_sim_state(data, CONTINUE);
1325 return priv;
1326 }
1327
1328
eap_sim_get_identity(struct eap_sm * sm,void * priv,size_t * len)1329 static const u8 * eap_sim_get_identity(struct eap_sm *sm, void *priv,
1330 size_t *len)
1331 {
1332 struct eap_sim_data *data = priv;
1333
1334 if (data->reauth_id) {
1335 *len = data->reauth_id_len;
1336 return data->reauth_id;
1337 }
1338
1339 if (data->pseudonym) {
1340 *len = data->pseudonym_len;
1341 return data->pseudonym;
1342 }
1343
1344 return NULL;
1345 }
1346
1347
eap_sim_isKeyAvailable(struct eap_sm * sm,void * priv)1348 static bool eap_sim_isKeyAvailable(struct eap_sm *sm, void *priv)
1349 {
1350 struct eap_sim_data *data = priv;
1351 return data->state == SUCCESS;
1352 }
1353
1354
eap_sim_getKey(struct eap_sm * sm,void * priv,size_t * len)1355 static u8 * eap_sim_getKey(struct eap_sm *sm, void *priv, size_t *len)
1356 {
1357 struct eap_sim_data *data = priv;
1358 u8 *key;
1359
1360 if (data->state != SUCCESS)
1361 return NULL;
1362
1363 key = os_memdup(data->msk, EAP_SIM_KEYING_DATA_LEN);
1364 if (key == NULL)
1365 return NULL;
1366
1367 *len = EAP_SIM_KEYING_DATA_LEN;
1368
1369 return key;
1370 }
1371
1372
eap_sim_get_session_id(struct eap_sm * sm,void * priv,size_t * len)1373 static u8 * eap_sim_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1374 {
1375 struct eap_sim_data *data = priv;
1376 u8 *id;
1377
1378 if (data->state != SUCCESS)
1379 return NULL;
1380
1381 if (!data->reauth)
1382 *len = 1 + data->num_chal * GSM_RAND_LEN + EAP_SIM_NONCE_MT_LEN;
1383 else
1384 *len = 1 + EAP_SIM_NONCE_S_LEN + EAP_SIM_MAC_LEN;
1385 id = os_malloc(*len);
1386 if (id == NULL)
1387 return NULL;
1388
1389 id[0] = EAP_TYPE_SIM;
1390 if (!data->reauth) {
1391 os_memcpy(id + 1, data->rand, data->num_chal * GSM_RAND_LEN);
1392 os_memcpy(id + 1 + data->num_chal * GSM_RAND_LEN,
1393 data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
1394 } else {
1395 os_memcpy(id + 1, data->nonce_s, EAP_SIM_NONCE_S_LEN);
1396 os_memcpy(id + 1 + EAP_SIM_NONCE_S_LEN, data->reauth_mac,
1397 EAP_SIM_MAC_LEN);
1398 }
1399 wpa_hexdump(MSG_DEBUG, "EAP-SIM: Derived Session-Id", id, *len);
1400
1401 return id;
1402 }
1403
1404
eap_sim_get_emsk(struct eap_sm * sm,void * priv,size_t * len)1405 static u8 * eap_sim_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1406 {
1407 struct eap_sim_data *data = priv;
1408 u8 *key;
1409
1410 if (data->state != SUCCESS)
1411 return NULL;
1412
1413 key = os_memdup(data->emsk, EAP_EMSK_LEN);
1414 if (key == NULL)
1415 return NULL;
1416
1417 *len = EAP_EMSK_LEN;
1418
1419 return key;
1420 }
1421
1422
eap_sim_get_error_code(void * priv)1423 static int eap_sim_get_error_code(void *priv)
1424 {
1425 struct eap_sim_data *data = priv;
1426 int current_data_error;
1427
1428 if (!data)
1429 return NO_EAP_METHOD_ERROR;
1430
1431 current_data_error = data->error_code;
1432
1433 /* Now reset for next transaction */
1434 data->error_code = NO_EAP_METHOD_ERROR;
1435
1436 return current_data_error;
1437 }
1438
1439
eap_peer_sim_register(void)1440 int eap_peer_sim_register(void)
1441 {
1442 struct eap_method *eap;
1443
1444 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1445 EAP_VENDOR_IETF, EAP_TYPE_SIM, "SIM");
1446 if (eap == NULL)
1447 return -1;
1448
1449 eap->init = eap_sim_init;
1450 eap->deinit = eap_sim_deinit;
1451 eap->process = eap_sim_process;
1452 eap->isKeyAvailable = eap_sim_isKeyAvailable;
1453 eap->getKey = eap_sim_getKey;
1454 eap->getSessionId = eap_sim_get_session_id;
1455 eap->has_reauth_data = eap_sim_has_reauth_data;
1456 eap->deinit_for_reauth = eap_sim_deinit_for_reauth;
1457 eap->init_for_reauth = eap_sim_init_for_reauth;
1458 eap->get_identity = eap_sim_get_identity;
1459 eap->get_emsk = eap_sim_get_emsk;
1460 eap->get_error_code = eap_sim_get_error_code;
1461
1462 return eap_peer_method_register(eap);
1463 }
1464