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 "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 /* Look for the realm of the permanent identity */
445 identity = eap_get_config_identity(sm, &identity_len);
446 if (identity) {
447 for (realm = identity, realm_len = identity_len;
448 realm_len > 0; realm_len--, realm++) {
449 if (*realm == '@')
450 break;
451 }
452 }
453 data->pseudonym = os_malloc(attr->next_pseudonym_len +
454 realm_len);
455 if (data->pseudonym == NULL) {
456 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No memory for "
457 "next pseudonym");
458 data->pseudonym_len = 0;
459 return -1;
460 }
461 os_memcpy(data->pseudonym, attr->next_pseudonym,
462 attr->next_pseudonym_len);
463 if (realm_len) {
464 os_memcpy(data->pseudonym + attr->next_pseudonym_len,
465 realm, realm_len);
466 }
467 data->pseudonym_len = attr->next_pseudonym_len + realm_len;
468 if (data->use_pseudonym)
469 eap_set_anon_id(sm, data->pseudonym,
470 data->pseudonym_len);
471 }
472
473 if (attr->next_reauth_id) {
474 os_free(data->reauth_id);
475 data->reauth_id = os_memdup(attr->next_reauth_id,
476 attr->next_reauth_id_len);
477 if (data->reauth_id == NULL) {
478 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No memory for "
479 "next reauth_id");
480 data->reauth_id_len = 0;
481 return -1;
482 }
483 data->reauth_id_len = attr->next_reauth_id_len;
484 wpa_hexdump_ascii(MSG_DEBUG,
485 "EAP-SIM: (encr) AT_NEXT_REAUTH_ID",
486 data->reauth_id,
487 data->reauth_id_len);
488 }
489
490 return 0;
491 }
492
493
eap_sim_client_error(struct eap_sim_data * data,u8 id,int err)494 static struct wpabuf * eap_sim_client_error(struct eap_sim_data *data, u8 id,
495 int err)
496 {
497 struct eap_sim_msg *msg;
498
499 eap_sim_state(data, FAILURE);
500 data->num_id_req = 0;
501 data->num_notification = 0;
502
503 wpa_printf(MSG_DEBUG, "EAP-SIM: Send Client-Error (error code %d)",
504 err);
505 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
506 EAP_SIM_SUBTYPE_CLIENT_ERROR);
507 eap_sim_msg_add(msg, EAP_SIM_AT_CLIENT_ERROR_CODE, err, NULL, 0);
508 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, NULL, NULL, 0);
509 }
510
511
512 #ifdef CRYPTO_RSA_OAEP_SHA256
513 static struct wpabuf *
eap_sim_encrypt_identity(struct crypto_rsa_key * imsi_privacy_key,const u8 * identity,size_t identity_len,const char * attr)514 eap_sim_encrypt_identity(struct crypto_rsa_key *imsi_privacy_key,
515 const u8 *identity, size_t identity_len,
516 const char *attr)
517 {
518 struct wpabuf *imsi_buf, *enc;
519 char *b64;
520 size_t b64_len, len;
521
522 wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM: Encrypt permanent identity",
523 identity, identity_len);
524
525 imsi_buf = wpabuf_alloc_copy(identity, identity_len);
526 if (!imsi_buf)
527 return NULL;
528 enc = crypto_rsa_oaep_sha256_encrypt(imsi_privacy_key, imsi_buf);
529 wpabuf_free(imsi_buf);
530 if (!enc)
531 return NULL;
532
533 b64 = base64_encode_no_lf(wpabuf_head(enc), wpabuf_len(enc), &b64_len);
534 wpabuf_free(enc);
535 if (!b64)
536 return NULL;
537
538 len = 1 + b64_len;
539 if (attr)
540 len += 1 + os_strlen(attr);
541 enc = wpabuf_alloc(len);
542 if (!enc) {
543 os_free(b64);
544 return NULL;
545 }
546 wpabuf_put_u8(enc, '\0');
547 wpabuf_put_data(enc, b64, b64_len);
548 os_free(b64);
549 if (attr) {
550 wpabuf_put_u8(enc, ',');
551 wpabuf_put_str(enc, attr);
552 }
553 wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM: Encrypted permanent identity",
554 wpabuf_head(enc), wpabuf_len(enc));
555
556 return enc;
557 }
558 #endif /* CRYPTO_RSA_OAEP_SHA256 */
559
560
eap_sim_response_start(struct eap_sm * sm,struct eap_sim_data * data,u8 id,enum eap_sim_id_req id_req)561 static struct wpabuf * eap_sim_response_start(struct eap_sm *sm,
562 struct eap_sim_data *data, u8 id,
563 enum eap_sim_id_req id_req)
564 {
565 const u8 *identity = NULL;
566 size_t identity_len = 0;
567 struct eap_sim_msg *msg;
568 struct wpabuf *resp;
569 struct wpabuf *enc_identity = NULL;
570 struct eap_peer_config *config = NULL;
571 bool use_imsi_identity = false;
572
573 data->reauth = 0;
574 if (id_req == ANY_ID && data->reauth_id) {
575 identity = data->reauth_id;
576 identity_len = data->reauth_id_len;
577 data->reauth = 1;
578 } else if ((id_req == ANY_ID || id_req == FULLAUTH_ID) &&
579 data->pseudonym &&
580 !eap_sim_anonymous_username(data->pseudonym,
581 data->pseudonym_len)) {
582 identity = data->pseudonym;
583 identity_len = data->pseudonym_len;
584 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID);
585 } else if (id_req != NO_ID_REQ) {
586 identity = eap_get_config_identity(sm, &identity_len);
587 if (identity) {
588 int ids = CLEAR_PSEUDONYM | CLEAR_REAUTH_ID;
589
590 if (data->pseudonym &&
591 eap_sim_anonymous_username(data->pseudonym,
592 data->pseudonym_len))
593 ids &= ~CLEAR_PSEUDONYM;
594 eap_sim_clear_identities(sm, data, ids);
595
596 config = eap_get_config(sm);
597 if (config && config->imsi_identity)
598 use_imsi_identity = true;
599 }
600 #ifdef CRYPTO_RSA_OAEP_SHA256
601 if (identity && data->imsi_privacy_key) {
602 const char *attr = NULL;
603
604 config = eap_get_config(sm);
605 if (config)
606 attr = config->imsi_privacy_attr;
607 enc_identity = eap_sim_encrypt_identity(
608 data->imsi_privacy_key,
609 identity, identity_len, attr);
610 if (!enc_identity) {
611 wpa_printf(MSG_INFO,
612 "EAP-SIM: Failed to encrypt permanent identity");
613 return eap_sim_client_error(
614 data, id,
615 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
616 }
617 /* Use the real identity, not the encrypted one, in MK
618 * derivation. */
619 os_free(data->mk_identity);
620 data->mk_identity = os_memdup(identity, identity_len);
621 data->mk_identity_len = identity_len;
622 identity = wpabuf_head(enc_identity);
623 identity_len = wpabuf_len(enc_identity);
624 }
625 #endif /* CRYPTO_RSA_OAEP_SHA256 */
626 }
627
628 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Start (id=%d)", id);
629 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id,
630 EAP_TYPE_SIM, EAP_SIM_SUBTYPE_START);
631 if (identity) {
632 wpa_hexdump_ascii(MSG_DEBUG, " AT_IDENTITY",
633 identity, identity_len);
634 eap_sim_msg_add(msg, EAP_SIM_AT_IDENTITY, identity_len,
635 identity, identity_len);
636 if (use_imsi_identity && config && config->imsi_identity) {
637 /* Use the IMSI identity override, i.e., the not
638 * encrypted one, in MK derivation, when using
639 * externally encrypted identity in configuration. */
640 os_free(data->mk_identity);
641 data->mk_identity = os_memdup(
642 config->imsi_identity,
643 config->imsi_identity_len);
644 data->mk_identity_len = config->imsi_identity_len;
645 } else if (!enc_identity) {
646 /* Use the last AT_IDENTITY value as the identity in
647 * MK derivation. */
648 os_free(data->mk_identity);
649 data->mk_identity = os_memdup(identity, identity_len);
650 data->mk_identity_len = identity_len;
651 }
652 }
653 wpabuf_free(enc_identity);
654 if (!data->reauth) {
655 wpa_hexdump(MSG_DEBUG, " AT_NONCE_MT",
656 data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
657 eap_sim_msg_add(msg, EAP_SIM_AT_NONCE_MT, 0,
658 data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
659 wpa_printf(MSG_DEBUG, " AT_SELECTED_VERSION %d",
660 data->selected_version);
661 eap_sim_msg_add(msg, EAP_SIM_AT_SELECTED_VERSION,
662 data->selected_version, NULL, 0);
663 }
664
665 resp = eap_sim_msg_finish(msg, EAP_TYPE_SIM, NULL, NULL, 0);
666 if (resp)
667 eap_sim_state(data, START_DONE);
668 return resp;
669 }
670
671
eap_sim_response_challenge(struct eap_sim_data * data,u8 id)672 static struct wpabuf * eap_sim_response_challenge(struct eap_sim_data *data,
673 u8 id)
674 {
675 struct eap_sim_msg *msg;
676
677 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Challenge (id=%d)", id);
678 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
679 EAP_SIM_SUBTYPE_CHALLENGE);
680 if (data->use_result_ind) {
681 wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
682 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
683 }
684 wpa_printf(MSG_DEBUG, " AT_MAC");
685 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
686 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, data->k_aut,
687 (u8 *) data->sres,
688 data->num_chal * EAP_SIM_SRES_LEN);
689 }
690
691
eap_sim_response_reauth(struct eap_sim_data * data,u8 id,int counter_too_small,const u8 * nonce_s)692 static struct wpabuf * eap_sim_response_reauth(struct eap_sim_data *data,
693 u8 id, int counter_too_small,
694 const u8 *nonce_s)
695 {
696 struct eap_sim_msg *msg;
697 unsigned int counter;
698
699 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Reauthentication (id=%d)",
700 id);
701 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
702 EAP_SIM_SUBTYPE_REAUTHENTICATION);
703 wpa_printf(MSG_DEBUG, " AT_IV");
704 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
705 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA);
706
707 if (counter_too_small) {
708 wpa_printf(MSG_DEBUG, " *AT_COUNTER_TOO_SMALL");
709 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER_TOO_SMALL, 0, NULL, 0);
710 counter = data->counter_too_small;
711 } else
712 counter = data->counter;
713
714 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", counter);
715 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0);
716
717 if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) {
718 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt "
719 "AT_ENCR_DATA");
720 eap_sim_msg_free(msg);
721 return NULL;
722 }
723 if (data->use_result_ind) {
724 wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
725 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
726 }
727 wpa_printf(MSG_DEBUG, " AT_MAC");
728 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
729 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, data->k_aut, nonce_s,
730 EAP_SIM_NONCE_S_LEN);
731 }
732
733
eap_sim_response_notification(struct eap_sim_data * data,u8 id,u16 notification)734 static struct wpabuf * eap_sim_response_notification(struct eap_sim_data *data,
735 u8 id, u16 notification)
736 {
737 struct eap_sim_msg *msg;
738 u8 *k_aut = (notification & 0x4000) == 0 ? data->k_aut : NULL;
739
740 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Notification (id=%d)", id);
741 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id,
742 EAP_TYPE_SIM, EAP_SIM_SUBTYPE_NOTIFICATION);
743 if (k_aut && data->reauth) {
744 wpa_printf(MSG_DEBUG, " AT_IV");
745 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
746 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV,
747 EAP_SIM_AT_ENCR_DATA);
748 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", data->counter);
749 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter,
750 NULL, 0);
751 if (eap_sim_msg_add_encr_end(msg, data->k_encr,
752 EAP_SIM_AT_PADDING)) {
753 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt "
754 "AT_ENCR_DATA");
755 eap_sim_msg_free(msg);
756 return NULL;
757 }
758 }
759 if (k_aut) {
760 wpa_printf(MSG_DEBUG, " AT_MAC");
761 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
762 }
763 return eap_sim_msg_finish(msg, EAP_TYPE_SIM, k_aut, (u8 *) "", 0);
764 }
765
766
eap_sim_process_start(struct eap_sm * sm,struct eap_sim_data * data,u8 id,struct eap_sim_attrs * attr)767 static struct wpabuf * eap_sim_process_start(struct eap_sm *sm,
768 struct eap_sim_data *data, u8 id,
769 struct eap_sim_attrs *attr)
770 {
771 int selected_version = -1, id_error;
772 size_t i;
773 u8 *pos;
774
775 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Start");
776 if (attr->version_list == NULL) {
777 wpa_printf(MSG_INFO, "EAP-SIM: No AT_VERSION_LIST in "
778 "SIM/Start");
779 return eap_sim_client_error(data, id,
780 EAP_SIM_UNSUPPORTED_VERSION);
781 }
782
783 os_free(data->ver_list);
784 data->ver_list = os_memdup(attr->version_list, attr->version_list_len);
785 if (data->ver_list == NULL) {
786 wpa_printf(MSG_DEBUG, "EAP-SIM: Failed to allocate "
787 "memory for version list");
788 return eap_sim_client_error(data, id,
789 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
790 }
791 data->ver_list_len = attr->version_list_len;
792 pos = data->ver_list;
793 for (i = 0; i < data->ver_list_len / 2; i++) {
794 int ver = pos[0] * 256 + pos[1];
795 pos += 2;
796 if (eap_sim_supported_ver(ver)) {
797 selected_version = ver;
798 break;
799 }
800 }
801 if (selected_version < 0) {
802 wpa_printf(MSG_INFO, "EAP-SIM: Could not find a supported "
803 "version");
804 return eap_sim_client_error(data, id,
805 EAP_SIM_UNSUPPORTED_VERSION);
806 }
807 wpa_printf(MSG_DEBUG, "EAP-SIM: Selected Version %d",
808 selected_version);
809 data->selected_version = selected_version;
810
811 id_error = 0;
812 switch (attr->id_req) {
813 case NO_ID_REQ:
814 break;
815 case ANY_ID:
816 if (data->num_id_req > 0)
817 id_error++;
818 data->num_id_req++;
819 break;
820 case FULLAUTH_ID:
821 if (data->num_id_req > 1)
822 id_error++;
823 data->num_id_req++;
824 break;
825 case PERMANENT_ID:
826 if (data->num_id_req > 2)
827 id_error++;
828 data->num_id_req++;
829 break;
830 }
831 if (id_error) {
832 wpa_printf(MSG_INFO, "EAP-SIM: Too many ID requests "
833 "used within one authentication");
834 return eap_sim_client_error(data, id,
835 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
836 }
837
838 return eap_sim_response_start(sm, data, id, attr->id_req);
839 }
840
841
eap_sim_process_challenge(struct eap_sm * sm,struct eap_sim_data * data,u8 id,const struct wpabuf * reqData,struct eap_sim_attrs * attr)842 static struct wpabuf * eap_sim_process_challenge(struct eap_sm *sm,
843 struct eap_sim_data *data,
844 u8 id,
845 const struct wpabuf *reqData,
846 struct eap_sim_attrs *attr)
847 {
848 const u8 *identity;
849 size_t identity_len;
850 struct eap_sim_attrs eattr;
851 int res;
852
853 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Challenge");
854 if (data->state != START_DONE) {
855 wpa_printf(MSG_DEBUG,
856 "EAP-SIM: Unexpected Challenge in state %s",
857 eap_sim_state_txt(data->state));
858 return eap_sim_client_error(data, id,
859 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
860 }
861 data->reauth = 0;
862 if (!attr->mac || !attr->rand) {
863 wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message "
864 "did not include%s%s",
865 !attr->mac ? " AT_MAC" : "",
866 !attr->rand ? " AT_RAND" : "");
867 return eap_sim_client_error(data, id,
868 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
869 }
870
871 wpa_printf(MSG_DEBUG, "EAP-SIM: %lu challenges",
872 (unsigned long) attr->num_chal);
873 if (attr->num_chal < data->min_num_chal) {
874 wpa_printf(MSG_INFO, "EAP-SIM: Insufficient number of "
875 "challenges (%lu)", (unsigned long) attr->num_chal);
876 return eap_sim_client_error(data, id,
877 EAP_SIM_INSUFFICIENT_NUM_OF_CHAL);
878 }
879 if (attr->num_chal > 3) {
880 wpa_printf(MSG_INFO, "EAP-SIM: Too many challenges "
881 "(%lu)", (unsigned long) attr->num_chal);
882 return eap_sim_client_error(data, id,
883 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
884 }
885
886 /* Verify that RANDs are different */
887 if (os_memcmp(attr->rand, attr->rand + GSM_RAND_LEN,
888 GSM_RAND_LEN) == 0 ||
889 (attr->num_chal > 2 &&
890 (os_memcmp(attr->rand, attr->rand + 2 * GSM_RAND_LEN,
891 GSM_RAND_LEN) == 0 ||
892 os_memcmp(attr->rand + GSM_RAND_LEN,
893 attr->rand + 2 * GSM_RAND_LEN,
894 GSM_RAND_LEN) == 0))) {
895 wpa_printf(MSG_INFO, "EAP-SIM: Same RAND used multiple times");
896 return eap_sim_client_error(data, id,
897 EAP_SIM_RAND_NOT_FRESH);
898 }
899
900 os_memcpy(data->rand, attr->rand, attr->num_chal * GSM_RAND_LEN);
901 data->num_chal = attr->num_chal;
902
903 res = eap_sim_gsm_auth(sm, data);
904 if (res > 0) {
905 wpa_printf(MSG_DEBUG, "EAP-SIM: Wait for external SIM processing");
906 return NULL;
907 }
908 if (res) {
909 wpa_printf(MSG_WARNING, "EAP-SIM: GSM authentication failed");
910 return eap_sim_client_error(data, id,
911 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
912 }
913
914 identity = data->mk_identity;
915 identity_len = data->mk_identity_len;
916 wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM: Selected identity for MK "
917 "derivation", identity, identity_len);
918 eap_sim_derive_mk(identity, identity_len, data->nonce_mt,
919 data->selected_version, data->ver_list,
920 data->ver_list_len, data->num_chal,
921 (const u8 *) data->kc, data->mk);
922 eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut, data->msk,
923 data->emsk);
924 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, data->nonce_mt,
925 EAP_SIM_NONCE_MT_LEN)) {
926 wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message "
927 "used invalid AT_MAC");
928 #ifdef TEST_FUZZ
929 wpa_printf(MSG_INFO,
930 "TEST: Ignore AT_MAC mismatch for fuzz testing");
931 #else /* TEST_FUZZ */
932 return eap_sim_client_error(data, id,
933 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
934 #endif /* TEST_FUZZ */
935 }
936
937 /* Old reauthentication identity must not be used anymore. In
938 * other words, if no new reauth identity is received, full
939 * authentication will be used on next reauthentication (using
940 * pseudonym identity or permanent identity). */
941 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID);
942
943 if (attr->encr_data) {
944 u8 *decrypted;
945 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
946 attr->encr_data_len, attr->iv,
947 &eattr, 0);
948 if (decrypted == NULL) {
949 return eap_sim_client_error(
950 data, id, EAP_SIM_UNABLE_TO_PROCESS_PACKET);
951 }
952 eap_sim_learn_ids(sm, data, &eattr);
953 os_free(decrypted);
954 }
955
956 if (data->result_ind && attr->result_ind)
957 data->use_result_ind = 1;
958
959 if (data->state != FAILURE) {
960 eap_sim_state(data, data->use_result_ind ?
961 RESULT_SUCCESS : SUCCESS);
962 }
963
964 data->num_id_req = 0;
965 data->num_notification = 0;
966 /* RFC 4186 specifies that counter is initialized to one after
967 * fullauth, but initializing it to zero makes it easier to implement
968 * reauth verification. */
969 data->counter = 0;
970 return eap_sim_response_challenge(data, id);
971 }
972
973
eap_sim_process_notification_reauth(struct eap_sim_data * data,struct eap_sim_attrs * attr)974 static int eap_sim_process_notification_reauth(struct eap_sim_data *data,
975 struct eap_sim_attrs *attr)
976 {
977 struct eap_sim_attrs eattr;
978 u8 *decrypted;
979
980 if (attr->encr_data == NULL || attr->iv == NULL) {
981 wpa_printf(MSG_WARNING, "EAP-SIM: Notification message after "
982 "reauth did not include encrypted data");
983 return -1;
984 }
985
986 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
987 attr->encr_data_len, attr->iv, &eattr,
988 0);
989 if (decrypted == NULL) {
990 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted "
991 "data from notification message");
992 return -1;
993 }
994
995 if (eattr.counter < 0 || (size_t) eattr.counter != data->counter) {
996 wpa_printf(MSG_WARNING, "EAP-SIM: Counter in notification "
997 "message does not match with counter in reauth "
998 "message");
999 os_free(decrypted);
1000 return -1;
1001 }
1002
1003 os_free(decrypted);
1004 return 0;
1005 }
1006
1007
eap_sim_process_notification_auth(struct eap_sim_data * data,const struct wpabuf * reqData,struct eap_sim_attrs * attr)1008 static int eap_sim_process_notification_auth(struct eap_sim_data *data,
1009 const struct wpabuf *reqData,
1010 struct eap_sim_attrs *attr)
1011 {
1012 if (attr->mac == NULL) {
1013 wpa_printf(MSG_INFO, "EAP-SIM: no AT_MAC in after_auth "
1014 "Notification message");
1015 return -1;
1016 }
1017
1018 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
1019 {
1020 wpa_printf(MSG_WARNING, "EAP-SIM: Notification message "
1021 "used invalid AT_MAC");
1022 return -1;
1023 }
1024
1025 if (data->reauth &&
1026 eap_sim_process_notification_reauth(data, attr)) {
1027 wpa_printf(MSG_WARNING, "EAP-SIM: Invalid notification "
1028 "message after reauth");
1029 return -1;
1030 }
1031
1032 return 0;
1033 }
1034
1035
eap_sim_process_notification(struct eap_sm * sm,struct eap_sim_data * data,u8 id,const struct wpabuf * reqData,struct eap_sim_attrs * attr)1036 static struct wpabuf * eap_sim_process_notification(
1037 struct eap_sm *sm, struct eap_sim_data *data, u8 id,
1038 const struct wpabuf *reqData, struct eap_sim_attrs *attr)
1039 {
1040 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Notification");
1041 if (data->num_notification > 0) {
1042 wpa_printf(MSG_INFO, "EAP-SIM: too many notification "
1043 "rounds (only one allowed)");
1044 return eap_sim_client_error(data, id,
1045 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1046 }
1047 data->num_notification++;
1048 if (attr->notification == -1) {
1049 wpa_printf(MSG_INFO, "EAP-SIM: no AT_NOTIFICATION in "
1050 "Notification message");
1051 return eap_sim_client_error(data, id,
1052 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1053 }
1054
1055 if ((attr->notification & 0x4000) == 0 &&
1056 eap_sim_process_notification_auth(data, reqData, attr)) {
1057 return eap_sim_client_error(data, id,
1058 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1059 }
1060
1061 eap_sim_report_notification(sm->msg_ctx, attr->notification, 0);
1062 if (attr->notification >= 0 && attr->notification < 32768) {
1063 data->error_code = attr->notification;
1064 eap_sim_state(data, FAILURE);
1065 } else if (attr->notification == EAP_SIM_SUCCESS &&
1066 data->state == RESULT_SUCCESS)
1067 eap_sim_state(data, SUCCESS);
1068 return eap_sim_response_notification(data, id, attr->notification);
1069 }
1070
1071
eap_sim_process_reauthentication(struct eap_sm * sm,struct eap_sim_data * data,u8 id,const struct wpabuf * reqData,struct eap_sim_attrs * attr)1072 static struct wpabuf * eap_sim_process_reauthentication(
1073 struct eap_sm *sm, struct eap_sim_data *data, u8 id,
1074 const struct wpabuf *reqData, struct eap_sim_attrs *attr)
1075 {
1076 struct eap_sim_attrs eattr;
1077 u8 *decrypted;
1078
1079 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Reauthentication");
1080
1081 if (data->reauth_id == NULL) {
1082 wpa_printf(MSG_WARNING, "EAP-SIM: Server is trying "
1083 "reauthentication, but no reauth_id available");
1084 return eap_sim_client_error(data, id,
1085 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1086 }
1087
1088 data->reauth = 1;
1089 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
1090 {
1091 wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication "
1092 "did not have valid AT_MAC");
1093 #ifdef TEST_FUZZ
1094 wpa_printf(MSG_INFO,
1095 "TEST: Ignore AT_MAC mismatch for fuzz testing");
1096 #else /* TEST_FUZZ */
1097 return eap_sim_client_error(data, id,
1098 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1099 #endif /* TEST_FUZZ */
1100 }
1101
1102 /* At this stage the received MAC has been verified. Use this MAC for
1103 * reauth Session-Id calculation if all other checks pass.
1104 * The peer does not use the local MAC but the received MAC in deriving
1105 * Session-Id. */
1106 #ifdef TEST_FUZZ
1107 if (attr->mac)
1108 os_memcpy(data->reauth_mac, attr->mac, EAP_SIM_MAC_LEN);
1109 else
1110 os_memset(data->reauth_mac, 0x12, EAP_SIM_MAC_LEN);
1111 #else /* TEST_FUZZ */
1112 os_memcpy(data->reauth_mac, attr->mac, EAP_SIM_MAC_LEN);
1113 #endif /* TEST_FUZZ */
1114 wpa_hexdump(MSG_DEBUG, "EAP-SIM: Server MAC",
1115 data->reauth_mac, EAP_SIM_MAC_LEN);
1116
1117 if (attr->encr_data == NULL || attr->iv == NULL) {
1118 wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication "
1119 "message did not include encrypted data");
1120 return eap_sim_client_error(data, id,
1121 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1122 }
1123
1124 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
1125 attr->encr_data_len, attr->iv, &eattr,
1126 0);
1127 if (decrypted == NULL) {
1128 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted "
1129 "data from reauthentication message");
1130 return eap_sim_client_error(data, id,
1131 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1132 }
1133
1134 if (eattr.nonce_s == NULL || eattr.counter < 0) {
1135 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No%s%s in reauth packet",
1136 !eattr.nonce_s ? " AT_NONCE_S" : "",
1137 eattr.counter < 0 ? " AT_COUNTER" : "");
1138 os_free(decrypted);
1139 return eap_sim_client_error(data, id,
1140 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1141 }
1142
1143 if (eattr.counter < 0 || (size_t) eattr.counter <= data->counter) {
1144 struct wpabuf *res;
1145 wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid counter "
1146 "(%d <= %d)", eattr.counter, data->counter);
1147 data->counter_too_small = eattr.counter;
1148
1149 /* Reply using Re-auth w/ AT_COUNTER_TOO_SMALL. The current
1150 * reauth_id must not be used to start a new reauthentication.
1151 */
1152 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID);
1153
1154 res = eap_sim_response_reauth(data, id, 1, eattr.nonce_s);
1155 os_free(decrypted);
1156
1157 return res;
1158 }
1159 data->counter = eattr.counter;
1160
1161 os_memcpy(data->nonce_s, eattr.nonce_s, EAP_SIM_NONCE_S_LEN);
1162 wpa_hexdump(MSG_DEBUG, "EAP-SIM: (encr) AT_NONCE_S",
1163 data->nonce_s, EAP_SIM_NONCE_S_LEN);
1164
1165 eap_sim_derive_keys_reauth(data->counter,
1166 data->reauth_id, data->reauth_id_len,
1167 data->nonce_s, data->mk, data->msk,
1168 data->emsk);
1169 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID);
1170 eap_sim_learn_ids(sm, data, &eattr);
1171
1172 if (data->result_ind && attr->result_ind)
1173 data->use_result_ind = 1;
1174
1175 if (data->state != FAILURE) {
1176 eap_sim_state(data, data->use_result_ind ?
1177 RESULT_SUCCESS : SUCCESS);
1178 }
1179
1180 data->num_id_req = 0;
1181 data->num_notification = 0;
1182 if (data->counter > EAP_SIM_MAX_FAST_REAUTHS) {
1183 wpa_printf(MSG_DEBUG, "EAP-SIM: Maximum number of "
1184 "fast reauths performed - force fullauth");
1185 eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID);
1186 }
1187 os_free(decrypted);
1188 return eap_sim_response_reauth(data, id, 0, data->nonce_s);
1189 }
1190
1191
eap_sim_process(struct eap_sm * sm,void * priv,struct eap_method_ret * ret,const struct wpabuf * reqData)1192 static struct wpabuf * eap_sim_process(struct eap_sm *sm, void *priv,
1193 struct eap_method_ret *ret,
1194 const struct wpabuf *reqData)
1195 {
1196 struct eap_sim_data *data = priv;
1197 const struct eap_hdr *req;
1198 u8 subtype, id;
1199 struct wpabuf *res;
1200 const u8 *pos;
1201 struct eap_sim_attrs attr;
1202 size_t len;
1203
1204 wpa_hexdump_buf(MSG_DEBUG, "EAP-SIM: EAP data", reqData);
1205 if (eap_get_config_identity(sm, &len) == NULL) {
1206 wpa_printf(MSG_INFO, "EAP-SIM: Identity not configured");
1207 eap_sm_request_identity(sm);
1208 ret->ignore = true;
1209 return NULL;
1210 }
1211
1212 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_SIM, reqData, &len);
1213 if (pos == NULL || len < 3) {
1214 ret->ignore = true;
1215 return NULL;
1216 }
1217 req = wpabuf_head(reqData);
1218 id = req->identifier;
1219 len = be_to_host16(req->length);
1220
1221 ret->ignore = false;
1222 ret->methodState = METHOD_MAY_CONT;
1223 ret->decision = DECISION_FAIL;
1224 ret->allowNotifications = true;
1225
1226 subtype = *pos++;
1227 wpa_printf(MSG_DEBUG, "EAP-SIM: Subtype=%d", subtype);
1228 pos += 2; /* Reserved */
1229
1230 if (eap_sim_parse_attr(pos, wpabuf_head_u8(reqData) + len, &attr, 0,
1231 0)) {
1232 res = eap_sim_client_error(data, id,
1233 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1234 goto done;
1235 }
1236
1237 switch (subtype) {
1238 case EAP_SIM_SUBTYPE_START:
1239 res = eap_sim_process_start(sm, data, id, &attr);
1240 break;
1241 case EAP_SIM_SUBTYPE_CHALLENGE:
1242 res = eap_sim_process_challenge(sm, data, id, reqData, &attr);
1243 break;
1244 case EAP_SIM_SUBTYPE_NOTIFICATION:
1245 res = eap_sim_process_notification(sm, data, id, reqData,
1246 &attr);
1247 break;
1248 case EAP_SIM_SUBTYPE_REAUTHENTICATION:
1249 res = eap_sim_process_reauthentication(sm, data, id, reqData,
1250 &attr);
1251 break;
1252 case EAP_SIM_SUBTYPE_CLIENT_ERROR:
1253 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Client-Error");
1254 res = eap_sim_client_error(data, id,
1255 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1256 break;
1257 default:
1258 wpa_printf(MSG_DEBUG, "EAP-SIM: Unknown subtype=%d", subtype);
1259 res = eap_sim_client_error(data, id,
1260 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1261 break;
1262 }
1263
1264 done:
1265 if (data->state == FAILURE) {
1266 ret->decision = DECISION_FAIL;
1267 ret->methodState = METHOD_DONE;
1268 } else if (data->state == SUCCESS) {
1269 ret->decision = data->use_result_ind ?
1270 DECISION_UNCOND_SUCC : DECISION_COND_SUCC;
1271 ret->methodState = data->use_result_ind ?
1272 METHOD_DONE : METHOD_MAY_CONT;
1273 } else if (data->state == RESULT_SUCCESS)
1274 ret->methodState = METHOD_CONT;
1275
1276 if (ret->methodState == METHOD_DONE) {
1277 ret->allowNotifications = false;
1278 }
1279
1280 return res;
1281 }
1282
1283
eap_sim_has_reauth_data(struct eap_sm * sm,void * priv)1284 static bool eap_sim_has_reauth_data(struct eap_sm *sm, void *priv)
1285 {
1286 struct eap_sim_data *data = priv;
1287 return data->pseudonym || data->reauth_id;
1288 }
1289
1290
eap_sim_deinit_for_reauth(struct eap_sm * sm,void * priv)1291 static void eap_sim_deinit_for_reauth(struct eap_sm *sm, void *priv)
1292 {
1293 struct eap_sim_data *data = priv;
1294
1295 os_free(data->mk_identity);
1296 data->mk_identity = NULL;
1297 data->mk_identity_len = 0;
1298 data->use_result_ind = 0;
1299 eap_sim_clear_keys(data, 1);
1300 }
1301
1302
eap_sim_init_for_reauth(struct eap_sm * sm,void * priv)1303 static void * eap_sim_init_for_reauth(struct eap_sm *sm, void *priv)
1304 {
1305 struct eap_sim_data *data = priv;
1306 if (random_get_bytes(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) {
1307 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data "
1308 "for NONCE_MT");
1309 eap_sim_deinit(sm, data);
1310 return NULL;
1311 }
1312
1313 if (sm->identity) {
1314 /* Use the EAP-Response/Identity in MK derivation if AT_IDENTITY
1315 * is not used. */
1316 os_free(data->mk_identity);
1317 data->mk_identity = os_memdup(sm->identity, sm->identity_len);
1318 data->mk_identity_len = sm->identity_len;
1319 }
1320
1321 data->num_id_req = 0;
1322 data->num_notification = 0;
1323 eap_sim_state(data, CONTINUE);
1324 return priv;
1325 }
1326
1327
eap_sim_get_identity(struct eap_sm * sm,void * priv,size_t * len)1328 static const u8 * eap_sim_get_identity(struct eap_sm *sm, void *priv,
1329 size_t *len)
1330 {
1331 struct eap_sim_data *data = priv;
1332
1333 if (data->reauth_id) {
1334 *len = data->reauth_id_len;
1335 return data->reauth_id;
1336 }
1337
1338 if (data->pseudonym) {
1339 *len = data->pseudonym_len;
1340 return data->pseudonym;
1341 }
1342
1343 return NULL;
1344 }
1345
1346
eap_sim_isKeyAvailable(struct eap_sm * sm,void * priv)1347 static bool eap_sim_isKeyAvailable(struct eap_sm *sm, void *priv)
1348 {
1349 struct eap_sim_data *data = priv;
1350 return data->state == SUCCESS;
1351 }
1352
1353
eap_sim_getKey(struct eap_sm * sm,void * priv,size_t * len)1354 static u8 * eap_sim_getKey(struct eap_sm *sm, void *priv, size_t *len)
1355 {
1356 struct eap_sim_data *data = priv;
1357 u8 *key;
1358
1359 if (data->state != SUCCESS)
1360 return NULL;
1361
1362 key = os_memdup(data->msk, EAP_SIM_KEYING_DATA_LEN);
1363 if (key == NULL)
1364 return NULL;
1365
1366 *len = EAP_SIM_KEYING_DATA_LEN;
1367
1368 return key;
1369 }
1370
1371
eap_sim_get_session_id(struct eap_sm * sm,void * priv,size_t * len)1372 static u8 * eap_sim_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1373 {
1374 struct eap_sim_data *data = priv;
1375 u8 *id;
1376
1377 if (data->state != SUCCESS)
1378 return NULL;
1379
1380 if (!data->reauth)
1381 *len = 1 + data->num_chal * GSM_RAND_LEN + EAP_SIM_NONCE_MT_LEN;
1382 else
1383 *len = 1 + EAP_SIM_NONCE_S_LEN + EAP_SIM_MAC_LEN;
1384 id = os_malloc(*len);
1385 if (id == NULL)
1386 return NULL;
1387
1388 id[0] = EAP_TYPE_SIM;
1389 if (!data->reauth) {
1390 os_memcpy(id + 1, data->rand, data->num_chal * GSM_RAND_LEN);
1391 os_memcpy(id + 1 + data->num_chal * GSM_RAND_LEN,
1392 data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
1393 } else {
1394 os_memcpy(id + 1, data->nonce_s, EAP_SIM_NONCE_S_LEN);
1395 os_memcpy(id + 1 + EAP_SIM_NONCE_S_LEN, data->reauth_mac,
1396 EAP_SIM_MAC_LEN);
1397 }
1398 wpa_hexdump(MSG_DEBUG, "EAP-SIM: Derived Session-Id", id, *len);
1399
1400 return id;
1401 }
1402
1403
eap_sim_get_emsk(struct eap_sm * sm,void * priv,size_t * len)1404 static u8 * eap_sim_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1405 {
1406 struct eap_sim_data *data = priv;
1407 u8 *key;
1408
1409 if (data->state != SUCCESS)
1410 return NULL;
1411
1412 key = os_memdup(data->emsk, EAP_EMSK_LEN);
1413 if (key == NULL)
1414 return NULL;
1415
1416 *len = EAP_EMSK_LEN;
1417
1418 return key;
1419 }
1420
1421
eap_sim_get_error_code(void * priv)1422 static int eap_sim_get_error_code(void *priv)
1423 {
1424 struct eap_sim_data *data = priv;
1425 int current_data_error;
1426
1427 if (!data)
1428 return NO_EAP_METHOD_ERROR;
1429
1430 current_data_error = data->error_code;
1431
1432 /* Now reset for next transaction */
1433 data->error_code = NO_EAP_METHOD_ERROR;
1434
1435 return current_data_error;
1436 }
1437
1438
eap_peer_sim_register(void)1439 int eap_peer_sim_register(void)
1440 {
1441 struct eap_method *eap;
1442
1443 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1444 EAP_VENDOR_IETF, EAP_TYPE_SIM, "SIM");
1445 if (eap == NULL)
1446 return -1;
1447
1448 eap->init = eap_sim_init;
1449 eap->deinit = eap_sim_deinit;
1450 eap->process = eap_sim_process;
1451 eap->isKeyAvailable = eap_sim_isKeyAvailable;
1452 eap->getKey = eap_sim_getKey;
1453 eap->getSessionId = eap_sim_get_session_id;
1454 eap->has_reauth_data = eap_sim_has_reauth_data;
1455 eap->deinit_for_reauth = eap_sim_deinit_for_reauth;
1456 eap->init_for_reauth = eap_sim_init_for_reauth;
1457 eap->get_identity = eap_sim_get_identity;
1458 eap->get_emsk = eap_sim_get_emsk;
1459 eap->get_error_code = eap_sim_get_error_code;
1460
1461 return eap_peer_method_register(eap);
1462 }
1463