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EAP-SIM peer: Fix AT_COUNTER_TOO_SMALL use
[thirdparty/hostap.git] / src / eap_peer / eap_sim.c
CommitLineData
6fc6879b
JM		 1/*
2 * EAP peer method: EAP-SIM (RFC 4186)
3 * Copyright (c) 2004-2008, Jouni Malinen <j@w1.fi>
4 *
0f3d578e
JM		 5 * This software may be distributed under the terms of the BSD license.
6 * See README for more details.
6fc6879b
JM		 7 */
8
9#include "includes.h"
10
11#include "common.h"
43df4cc2
JM		 12#include "pcsc_funcs.h"
13#include "crypto/milenage.h"
3642c431 14#include "crypto/random.h"
6fc6879b
JM		 15#include "eap_peer/eap_i.h"
16#include "eap_config.h"
6fc6879b
JM		 17#include "eap_common/eap_sim_common.h"
18
19
20struct eap_sim_data {
21 u8 *ver_list;
22 size_t ver_list_len;
23 int selected_version;
24 size_t min_num_chal, num_chal;
25
26 u8 kc[3][EAP_SIM_KC_LEN];
27 u8 sres[3][EAP_SIM_SRES_LEN];
28 u8 nonce_mt[EAP_SIM_NONCE_MT_LEN], nonce_s[EAP_SIM_NONCE_S_LEN];
29 u8 mk[EAP_SIM_MK_LEN];
30 u8 k_aut[EAP_SIM_K_AUT_LEN];
31 u8 k_encr[EAP_SIM_K_ENCR_LEN];
32 u8 msk[EAP_SIM_KEYING_DATA_LEN];
33 u8 emsk[EAP_EMSK_LEN];
34 u8 rand[3][GSM_RAND_LEN];
35
36 int num_id_req, num_notification;
37 u8 *pseudonym;
38 size_t pseudonym_len;
39 u8 *reauth_id;
40 size_t reauth_id_len;
41 int reauth;
42 unsigned int counter, counter_too_small;
43 u8 *last_eap_identity;
44 size_t last_eap_identity_len;
45 enum {
46 CONTINUE, RESULT_SUCCESS, RESULT_FAILURE, SUCCESS, FAILURE
47 } state;
48 int result_ind, use_result_ind;
49};
50
51
52#ifndef CONFIG_NO_STDOUT_DEBUG
53static const char * eap_sim_state_txt(int state)
54{
55 switch (state) {
56 case CONTINUE:
57 return "CONTINUE";
58 case RESULT_SUCCESS:
59 return "RESULT_SUCCESS";
60 case RESULT_FAILURE:
61 return "RESULT_FAILURE";
62 case SUCCESS:
63 return "SUCCESS";
64 case FAILURE:
65 return "FAILURE";
66 default:
67 return "?";
68 }
69}
70#endif /* CONFIG_NO_STDOUT_DEBUG */
71
72
73static void eap_sim_state(struct eap_sim_data *data, int state)
74{
75 wpa_printf(MSG_DEBUG, "EAP-SIM: %s -> %s",
76 eap_sim_state_txt(data->state),
77 eap_sim_state_txt(state));
78 data->state = state;
79}
80
81
82static void * eap_sim_init(struct eap_sm *sm)
83{
84 struct eap_sim_data *data;
85 struct eap_peer_config *config = eap_get_config(sm);
86
87 data = os_zalloc(sizeof(*data));
88 if (data == NULL)
89 return NULL;
90
3642c431 91 if (random_get_bytes(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) {
6fc6879b
JM		 92 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data "
93 "for NONCE_MT");
94 os_free(data);
95 return NULL;
96 }
97
98 data->min_num_chal = 2;
99 if (config && config->phase1) {
100 char *pos = os_strstr(config->phase1, "sim_min_num_chal=");
101 if (pos) {
102 data->min_num_chal = atoi(pos + 17);
103 if (data->min_num_chal < 2 || data->min_num_chal > 3) {
104 wpa_printf(MSG_WARNING, "EAP-SIM: Invalid "
105 "sim_min_num_chal configuration "
106 "(%lu, expected 2 or 3)",
107 (unsigned long) data->min_num_chal);
108 os_free(data);
109 return NULL;
110 }
111 wpa_printf(MSG_DEBUG, "EAP-SIM: Set minimum number of "
112 "challenges to %lu",
113 (unsigned long) data->min_num_chal);
114 }
115
116 data->result_ind = os_strstr(config->phase1, "result_ind=1") !=
117 NULL;
118 }
119
120 eap_sim_state(data, CONTINUE);
121
122 return data;
123}
124
125
126static void eap_sim_deinit(struct eap_sm *sm, void *priv)
127{
128 struct eap_sim_data *data = priv;
129 if (data) {
130 os_free(data->ver_list);
131 os_free(data->pseudonym);
132 os_free(data->reauth_id);
133 os_free(data->last_eap_identity);
134 os_free(data);
135 }
136}
137
138
139static int eap_sim_gsm_auth(struct eap_sm *sm, struct eap_sim_data *data)
140{
81eec387
JM		 141 struct eap_peer_config *conf;
142
6fc6879b 143 wpa_printf(MSG_DEBUG, "EAP-SIM: GSM authentication algorithm");
81eec387
JM		 144
145 conf = eap_get_config(sm);
146 if (conf == NULL)
6fc6879b 147 return -1;
81eec387
JM		 148 if (conf->pcsc) {
149 if (scard_gsm_auth(sm->scard_ctx, data->rand[0],
150 data->sres[0], data->kc[0]) ||
151 scard_gsm_auth(sm->scard_ctx, data->rand[1],
152 data->sres[1], data->kc[1]) ||
153 (data->num_chal > 2 &&
154 scard_gsm_auth(sm->scard_ctx, data->rand[2],
155 data->sres[2], data->kc[2]))) {
156 wpa_printf(MSG_DEBUG, "EAP-SIM: GSM SIM "
157 "authentication could not be completed");
158 return -1;
159 }
160 return 0;
161 }
162
163#ifdef CONFIG_SIM_SIMULATOR
164 if (conf->password) {
165 u8 opc[16], k[16];
166 const char *pos;
a532c108 167 size_t i;
81eec387
JM		 168 wpa_printf(MSG_DEBUG, "EAP-SIM: Use internal GSM-Milenage "
169 "implementation for authentication");
170 if (conf->password_len < 65) {
171 wpa_printf(MSG_DEBUG, "EAP-SIM: invalid GSM-Milenage "
172 "password");
173 return -1;
174 }
175 pos = (const char *) conf->password;
176 if (hexstr2bin(pos, k, 16))
177 return -1;
178 pos += 32;
179 if (*pos != ':')
180 return -1;
181 pos++;
182
183 if (hexstr2bin(pos, opc, 16))
184 return -1;
185
a532c108
JM		 186 for (i = 0; i < data->num_chal; i++) {
187 if (gsm_milenage(opc, k, data->rand[i],
188 data->sres[i], data->kc[i])) {
189 wpa_printf(MSG_DEBUG, "EAP-SIM: "
190 "GSM-Milenage authentication "
191 "could not be completed");
192 return -1;
193 }
194 wpa_hexdump(MSG_DEBUG, "EAP-SIM: RAND",
195 data->rand[i], GSM_RAND_LEN);
196 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: SRES",
197 data->sres[i], EAP_SIM_SRES_LEN);
198 wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: Kc",
199 data->kc[i], EAP_SIM_KC_LEN);
81eec387
JM		 200 }
201 return 0;
6fc6879b 202 }
81eec387
JM		 203#endif /* CONFIG_SIM_SIMULATOR */
204
205#ifdef CONFIG_SIM_HARDCODED
6fc6879b
JM		 206 /* These hardcoded Kc and SRES values are used for testing. RAND to
207 * KC/SREC mapping is very bogus as far as real authentication is
208 * concerned, but it is quite useful for cases where the AS is rotating
209 * the order of pre-configured values. */
210 {
211 size_t i;
81eec387
JM		 212
213 wpa_printf(MSG_DEBUG, "EAP-SIM: Use hardcoded Kc and SRES "
214 "values for testing");
215
6fc6879b
JM		 216 for (i = 0; i < data->num_chal; i++) {
217 if (data->rand[i][0] == 0xaa) {
218 os_memcpy(data->kc[i],
219 "\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7",
220 EAP_SIM_KC_LEN);
221 os_memcpy(data->sres[i], "\xd1\xd2\xd3\xd4",
222 EAP_SIM_SRES_LEN);
223 } else if (data->rand[i][0] == 0xbb) {
224 os_memcpy(data->kc[i],
225 "\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7",
226 EAP_SIM_KC_LEN);
227 os_memcpy(data->sres[i], "\xe1\xe2\xe3\xe4",
228 EAP_SIM_SRES_LEN);
229 } else {
230 os_memcpy(data->kc[i],
231 "\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7",
232 EAP_SIM_KC_LEN);
233 os_memcpy(data->sres[i], "\xf1\xf2\xf3\xf4",
234 EAP_SIM_SRES_LEN);
235 }
236 }
237 }
81eec387 238
6fc6879b 239 return 0;
81eec387
JM		 240
241#else /* CONFIG_SIM_HARDCODED */
242
243 wpa_printf(MSG_DEBUG, "EAP-SIM: No GSM authentication algorithm "
244 "enabled");
245 return -1;
246
247#endif /* CONFIG_SIM_HARDCODED */
6fc6879b
JM		 248}
249
250
251static int eap_sim_supported_ver(int version)
252{
253 return version == EAP_SIM_VERSION;
254}
255
256
257#define CLEAR_PSEUDONYM 0x01
258#define CLEAR_REAUTH_ID 0x02
259#define CLEAR_EAP_ID 0x04
260
261static void eap_sim_clear_identities(struct eap_sim_data *data, int id)
262{
1037235c
SB		 263 if ((id & CLEAR_PSEUDONYM) && data->pseudonym) {
264 wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old pseudonym");
6fc6879b
JM		 265 os_free(data->pseudonym);
266 data->pseudonym = NULL;
267 data->pseudonym_len = 0;
268 }
1037235c
SB		 269 if ((id & CLEAR_REAUTH_ID) && data->reauth_id) {
270 wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old reauth_id");
6fc6879b
JM		 271 os_free(data->reauth_id);
272 data->reauth_id = NULL;
273 data->reauth_id_len = 0;
274 }
1037235c
SB		 275 if ((id & CLEAR_EAP_ID) && data->last_eap_identity) {
276 wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old eap_id");
6fc6879b
JM		 277 os_free(data->last_eap_identity);
278 data->last_eap_identity = NULL;
279 data->last_eap_identity_len = 0;
280 }
281}
282
283
a6689be8 284static int eap_sim_learn_ids(struct eap_sm *sm, struct eap_sim_data *data,
6fc6879b
JM		 285 struct eap_sim_attrs *attr)
286{
287 if (attr->next_pseudonym) {
a6689be8
SB		 288 const u8 *identity = NULL;
289 size_t identity_len = 0;
290 const u8 *realm = NULL;
291 size_t realm_len = 0;
292
293 wpa_hexdump_ascii(MSG_DEBUG,
294 "EAP-SIM: (encr) AT_NEXT_PSEUDONYM",
295 attr->next_pseudonym,
296 attr->next_pseudonym_len);
6fc6879b 297 os_free(data->pseudonym);
a6689be8
SB		 298 /* Look for the realm of the permanent identity */
299 identity = eap_get_config_identity(sm, &identity_len);
300 if (identity) {
301 for (realm = identity, realm_len = identity_len;
302 realm_len > 0; realm_len--, realm++) {
303 if (*realm == '@')
304 break;
305 }
306 }
307 data->pseudonym = os_malloc(attr->next_pseudonym_len +
308 realm_len);
6fc6879b
JM		 309 if (data->pseudonym == NULL) {
310 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No memory for "
311 "next pseudonym");
a6689be8 312 data->pseudonym_len = 0;
6fc6879b
JM		 313 return -1;
314 }
315 os_memcpy(data->pseudonym, attr->next_pseudonym,
316 attr->next_pseudonym_len);
a6689be8
SB		 317 if (realm_len) {
318 os_memcpy(data->pseudonym + attr->next_pseudonym_len,
319 realm, realm_len);
320 }
321 data->pseudonym_len = attr->next_pseudonym_len + realm_len;
6fc6879b
JM		 322 }
323
324 if (attr->next_reauth_id) {
325 os_free(data->reauth_id);
326 data->reauth_id = os_malloc(attr->next_reauth_id_len);
327 if (data->reauth_id == NULL) {
328 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No memory for "
329 "next reauth_id");
a6689be8 330 data->reauth_id_len = 0;
6fc6879b
JM		 331 return -1;
332 }
333 os_memcpy(data->reauth_id, attr->next_reauth_id,
334 attr->next_reauth_id_len);
335 data->reauth_id_len = attr->next_reauth_id_len;
336 wpa_hexdump_ascii(MSG_DEBUG,
337 "EAP-SIM: (encr) AT_NEXT_REAUTH_ID",
338 data->reauth_id,
339 data->reauth_id_len);
340 }
341
342 return 0;
343}
344
345
346static struct wpabuf * eap_sim_client_error(struct eap_sim_data *data, u8 id,
347 int err)
348{
349 struct eap_sim_msg *msg;
350
351 eap_sim_state(data, FAILURE);
352 data->num_id_req = 0;
353 data->num_notification = 0;
354
355 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
356 EAP_SIM_SUBTYPE_CLIENT_ERROR);
357 eap_sim_msg_add(msg, EAP_SIM_AT_CLIENT_ERROR_CODE, err, NULL, 0);
358 return eap_sim_msg_finish(msg, NULL, NULL, 0);
359}
360
361
362static struct wpabuf * eap_sim_response_start(struct eap_sm *sm,
363 struct eap_sim_data *data, u8 id,
364 enum eap_sim_id_req id_req)
365{
366 const u8 *identity = NULL;
367 size_t identity_len = 0;
368 struct eap_sim_msg *msg;
369
370 data->reauth = 0;
371 if (id_req == ANY_ID && data->reauth_id) {
372 identity = data->reauth_id;
373 identity_len = data->reauth_id_len;
374 data->reauth = 1;
375 } else if ((id_req == ANY_ID || id_req == FULLAUTH_ID) &&
376 data->pseudonym) {
377 identity = data->pseudonym;
378 identity_len = data->pseudonym_len;
379 eap_sim_clear_identities(data, CLEAR_REAUTH_ID);
380 } else if (id_req != NO_ID_REQ) {
381 identity = eap_get_config_identity(sm, &identity_len);
382 if (identity) {
383 eap_sim_clear_identities(data, CLEAR_PSEUDONYM |
384 CLEAR_REAUTH_ID);
385 }
386 }
387 if (id_req != NO_ID_REQ)
388 eap_sim_clear_identities(data, CLEAR_EAP_ID);
389
390 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Start (id=%d)", id);
391 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id,
392 EAP_TYPE_SIM, EAP_SIM_SUBTYPE_START);
393 if (!data->reauth) {
394 wpa_hexdump(MSG_DEBUG, " AT_NONCE_MT",
395 data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
396 eap_sim_msg_add(msg, EAP_SIM_AT_NONCE_MT, 0,
397 data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
398 wpa_printf(MSG_DEBUG, " AT_SELECTED_VERSION %d",
399 data->selected_version);
400 eap_sim_msg_add(msg, EAP_SIM_AT_SELECTED_VERSION,
401 data->selected_version, NULL, 0);
402 }
403
404 if (identity) {
405 wpa_hexdump_ascii(MSG_DEBUG, " AT_IDENTITY",
406 identity, identity_len);
407 eap_sim_msg_add(msg, EAP_SIM_AT_IDENTITY, identity_len,
408 identity, identity_len);
409 }
410
411 return eap_sim_msg_finish(msg, NULL, NULL, 0);
412}
413
414
415static struct wpabuf * eap_sim_response_challenge(struct eap_sim_data *data,
416 u8 id)
417{
418 struct eap_sim_msg *msg;
419
420 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Challenge (id=%d)", id);
421 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
422 EAP_SIM_SUBTYPE_CHALLENGE);
423 if (data->use_result_ind) {
424 wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
425 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
426 }
427 wpa_printf(MSG_DEBUG, " AT_MAC");
428 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
429 return eap_sim_msg_finish(msg, data->k_aut, (u8 *) data->sres,
430 data->num_chal * EAP_SIM_SRES_LEN);
431}
432
433
434static struct wpabuf * eap_sim_response_reauth(struct eap_sim_data *data,
5d65ca51
JM		 435 u8 id, int counter_too_small,
436 const u8 *nonce_s)
6fc6879b
JM		 437{
438 struct eap_sim_msg *msg;
439 unsigned int counter;
440
441 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Reauthentication (id=%d)",
442 id);
443 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
444 EAP_SIM_SUBTYPE_REAUTHENTICATION);
445 wpa_printf(MSG_DEBUG, " AT_IV");
446 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
447 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA);
448
449 if (counter_too_small) {
450 wpa_printf(MSG_DEBUG, " *AT_COUNTER_TOO_SMALL");
451 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER_TOO_SMALL, 0, NULL, 0);
452 counter = data->counter_too_small;
453 } else
454 counter = data->counter;
455
456 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", counter);
457 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0);
458
459 if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) {
460 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt "
461 "AT_ENCR_DATA");
462 eap_sim_msg_free(msg);
463 return NULL;
464 }
465 if (data->use_result_ind) {
466 wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
467 eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
468 }
469 wpa_printf(MSG_DEBUG, " AT_MAC");
470 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
5d65ca51 471 return eap_sim_msg_finish(msg, data->k_aut, nonce_s,
6fc6879b
JM		 472 EAP_SIM_NONCE_S_LEN);
473}
474
475
476static struct wpabuf * eap_sim_response_notification(struct eap_sim_data *data,
477 u8 id, u16 notification)
478{
479 struct eap_sim_msg *msg;
480 u8 *k_aut = (notification & 0x4000) == 0 ? data->k_aut : NULL;
481
482 wpa_printf(MSG_DEBUG, "Generating EAP-SIM Notification (id=%d)", id);
483 msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id,
484 EAP_TYPE_SIM, EAP_SIM_SUBTYPE_NOTIFICATION);
6fc6879b
JM		 485 if (k_aut && data->reauth) {
486 wpa_printf(MSG_DEBUG, " AT_IV");
487 wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
488 eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV,
489 EAP_SIM_AT_ENCR_DATA);
490 wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", data->counter);
491 eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter,
492 NULL, 0);
493 if (eap_sim_msg_add_encr_end(msg, data->k_encr,
494 EAP_SIM_AT_PADDING)) {
495 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt "
496 "AT_ENCR_DATA");
497 eap_sim_msg_free(msg);
498 return NULL;
499 }
500 }
501 if (k_aut) {
502 wpa_printf(MSG_DEBUG, " AT_MAC");
503 eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
504 }
505 return eap_sim_msg_finish(msg, k_aut, (u8 *) "", 0);
506}
507
508
509static struct wpabuf * eap_sim_process_start(struct eap_sm *sm,
510 struct eap_sim_data *data, u8 id,
511 struct eap_sim_attrs *attr)
512{
513 int selected_version = -1, id_error;
514 size_t i;
515 u8 *pos;
516
517 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Start");
518 if (attr->version_list == NULL) {
519 wpa_printf(MSG_INFO, "EAP-SIM: No AT_VERSION_LIST in "
520 "SIM/Start");
521 return eap_sim_client_error(data, id,
522 EAP_SIM_UNSUPPORTED_VERSION);
523 }
524
525 os_free(data->ver_list);
526 data->ver_list = os_malloc(attr->version_list_len);
527 if (data->ver_list == NULL) {
528 wpa_printf(MSG_DEBUG, "EAP-SIM: Failed to allocate "
529 "memory for version list");
530 return eap_sim_client_error(data, id,
531 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
532 }
533 os_memcpy(data->ver_list, attr->version_list, attr->version_list_len);
534 data->ver_list_len = attr->version_list_len;
535 pos = data->ver_list;
536 for (i = 0; i < data->ver_list_len / 2; i++) {
537 int ver = pos[0] * 256 + pos[1];
538 pos += 2;
539 if (eap_sim_supported_ver(ver)) {
540 selected_version = ver;
541 break;
542 }
543 }
544 if (selected_version < 0) {
545 wpa_printf(MSG_INFO, "EAP-SIM: Could not find a supported "
546 "version");
547 return eap_sim_client_error(data, id,
548 EAP_SIM_UNSUPPORTED_VERSION);
549 }
550 wpa_printf(MSG_DEBUG, "EAP-SIM: Selected Version %d",
551 selected_version);
552 data->selected_version = selected_version;
553
554 id_error = 0;
555 switch (attr->id_req) {
556 case NO_ID_REQ:
557 break;
558 case ANY_ID:
559 if (data->num_id_req > 0)
560 id_error++;
561 data->num_id_req++;
562 break;
563 case FULLAUTH_ID:
564 if (data->num_id_req > 1)
565 id_error++;
566 data->num_id_req++;
567 break;
568 case PERMANENT_ID:
569 if (data->num_id_req > 2)
570 id_error++;
571 data->num_id_req++;
572 break;
573 }
574 if (id_error) {
575 wpa_printf(MSG_INFO, "EAP-SIM: Too many ID requests "
576 "used within one authentication");
577 return eap_sim_client_error(data, id,
578 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
579 }
580
581 return eap_sim_response_start(sm, data, id, attr->id_req);
582}
583
584
585static struct wpabuf * eap_sim_process_challenge(struct eap_sm *sm,
586 struct eap_sim_data *data,
587 u8 id,
588 const struct wpabuf *reqData,
589 struct eap_sim_attrs *attr)
590{
591 const u8 *identity;
592 size_t identity_len;
593 struct eap_sim_attrs eattr;
594
595 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Challenge");
596 data->reauth = 0;
597 if (!attr->mac || !attr->rand) {
598 wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message "
599 "did not include%s%s",
600 !attr->mac ? " AT_MAC" : "",
601 !attr->rand ? " AT_RAND" : "");
602 return eap_sim_client_error(data, id,
603 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
604 }
605
606 wpa_printf(MSG_DEBUG, "EAP-SIM: %lu challenges",
607 (unsigned long) attr->num_chal);
608 if (attr->num_chal < data->min_num_chal) {
609 wpa_printf(MSG_INFO, "EAP-SIM: Insufficient number of "
610 "challenges (%lu)", (unsigned long) attr->num_chal);
611 return eap_sim_client_error(data, id,
612 EAP_SIM_INSUFFICIENT_NUM_OF_CHAL);
613 }
614 if (attr->num_chal > 3) {
615 wpa_printf(MSG_INFO, "EAP-SIM: Too many challenges "
616 "(%lu)", (unsigned long) attr->num_chal);
617 return eap_sim_client_error(data, id,
618 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
619 }
620
621 /* Verify that RANDs are different */
622 if (os_memcmp(attr->rand, attr->rand + GSM_RAND_LEN,
623 GSM_RAND_LEN) == 0 ||
624 (attr->num_chal > 2 &&
625 (os_memcmp(attr->rand, attr->rand + 2 * GSM_RAND_LEN,
626 GSM_RAND_LEN) == 0 ||
627 os_memcmp(attr->rand + GSM_RAND_LEN,
628 attr->rand + 2 * GSM_RAND_LEN,
629 GSM_RAND_LEN) == 0))) {
630 wpa_printf(MSG_INFO, "EAP-SIM: Same RAND used multiple times");
631 return eap_sim_client_error(data, id,
632 EAP_SIM_RAND_NOT_FRESH);
633 }
634
635 os_memcpy(data->rand, attr->rand, attr->num_chal * GSM_RAND_LEN);
636 data->num_chal = attr->num_chal;
637
638 if (eap_sim_gsm_auth(sm, data)) {
639 wpa_printf(MSG_WARNING, "EAP-SIM: GSM authentication failed");
640 return eap_sim_client_error(data, id,
641 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
642 }
643 if (data->last_eap_identity) {
644 identity = data->last_eap_identity;
645 identity_len = data->last_eap_identity_len;
646 } else if (data->pseudonym) {
647 identity = data->pseudonym;
648 identity_len = data->pseudonym_len;
649 } else
650 identity = eap_get_config_identity(sm, &identity_len);
651 wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM: Selected identity for MK "
652 "derivation", identity, identity_len);
653 eap_sim_derive_mk(identity, identity_len, data->nonce_mt,
654 data->selected_version, data->ver_list,
655 data->ver_list_len, data->num_chal,
656 (const u8 *) data->kc, data->mk);
657 eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut, data->msk,
658 data->emsk);
659 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, data->nonce_mt,
660 EAP_SIM_NONCE_MT_LEN)) {
661 wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message "
662 "used invalid AT_MAC");
663 return eap_sim_client_error(data, id,
664 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
665 }
666
a9f40ae7
SB		 667 /* Old reauthentication identity must not be used anymore. In
668 * other words, if no new reauth identity is received, full
669 * authentication will be used on next reauthentication (using
670 * pseudonym identity or permanent identity). */
671 eap_sim_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
6fc6879b
JM		 672
673 if (attr->encr_data) {
674 u8 *decrypted;
675 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
676 attr->encr_data_len, attr->iv,
677 &eattr, 0);
678 if (decrypted == NULL) {
679 return eap_sim_client_error(
680 data, id, EAP_SIM_UNABLE_TO_PROCESS_PACKET);
681 }
a6689be8 682 eap_sim_learn_ids(sm, data, &eattr);
6fc6879b
JM		 683 os_free(decrypted);
684 }
685
686 if (data->result_ind && attr->result_ind)
687 data->use_result_ind = 1;
688
689 if (data->state != FAILURE && data->state != RESULT_FAILURE) {
690 eap_sim_state(data, data->use_result_ind ?
691 RESULT_SUCCESS : SUCCESS);
692 }
693
694 data->num_id_req = 0;
695 data->num_notification = 0;
696 /* RFC 4186 specifies that counter is initialized to one after
697 * fullauth, but initializing it to zero makes it easier to implement
698 * reauth verification. */
699 data->counter = 0;
700 return eap_sim_response_challenge(data, id);
701}
702
703
704static int eap_sim_process_notification_reauth(struct eap_sim_data *data,
705 struct eap_sim_attrs *attr)
706{
707 struct eap_sim_attrs eattr;
708 u8 *decrypted;
709
710 if (attr->encr_data == NULL || attr->iv == NULL) {
711 wpa_printf(MSG_WARNING, "EAP-SIM: Notification message after "
712 "reauth did not include encrypted data");
713 return -1;
714 }
715
716 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
717 attr->encr_data_len, attr->iv, &eattr,
718 0);
719 if (decrypted == NULL) {
720 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted "
721 "data from notification message");
722 return -1;
723 }
724
725 if (eattr.counter < 0 || (size_t) eattr.counter != data->counter) {
726 wpa_printf(MSG_WARNING, "EAP-SIM: Counter in notification "
727 "message does not match with counter in reauth "
728 "message");
729 os_free(decrypted);
730 return -1;
731 }
732
733 os_free(decrypted);
734 return 0;
735}
736
737
738static int eap_sim_process_notification_auth(struct eap_sim_data *data,
739 const struct wpabuf *reqData,
740 struct eap_sim_attrs *attr)
741{
742 if (attr->mac == NULL) {
743 wpa_printf(MSG_INFO, "EAP-SIM: no AT_MAC in after_auth "
744 "Notification message");
745 return -1;
746 }
747
748 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
749 {
750 wpa_printf(MSG_WARNING, "EAP-SIM: Notification message "
751 "used invalid AT_MAC");
752 return -1;
753 }
754
755 if (data->reauth &&
756 eap_sim_process_notification_reauth(data, attr)) {
757 wpa_printf(MSG_WARNING, "EAP-SIM: Invalid notification "
758 "message after reauth");
759 return -1;
760 }
761
762 return 0;
763}
764
765
766static struct wpabuf * eap_sim_process_notification(
767 struct eap_sm *sm, struct eap_sim_data *data, u8 id,
768 const struct wpabuf *reqData, struct eap_sim_attrs *attr)
769{
770 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Notification");
771 if (data->num_notification > 0) {
772 wpa_printf(MSG_INFO, "EAP-SIM: too many notification "
773 "rounds (only one allowed)");
774 return eap_sim_client_error(data, id,
775 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
776 }
777 data->num_notification++;
778 if (attr->notification == -1) {
779 wpa_printf(MSG_INFO, "EAP-SIM: no AT_NOTIFICATION in "
780 "Notification message");
781 return eap_sim_client_error(data, id,
782 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
783 }
784
785 if ((attr->notification & 0x4000) == 0 &&
786 eap_sim_process_notification_auth(data, reqData, attr)) {
787 return eap_sim_client_error(data, id,
788 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
789 }
790
791 eap_sim_report_notification(sm->msg_ctx, attr->notification, 0);
792 if (attr->notification >= 0 && attr->notification < 32768) {
793 eap_sim_state(data, FAILURE);
794 } else if (attr->notification == EAP_SIM_SUCCESS &&
795 data->state == RESULT_SUCCESS)
796 eap_sim_state(data, SUCCESS);
797 return eap_sim_response_notification(data, id, attr->notification);
798}
799
800
801static struct wpabuf * eap_sim_process_reauthentication(
802 struct eap_sm *sm, struct eap_sim_data *data, u8 id,
803 const struct wpabuf *reqData, struct eap_sim_attrs *attr)
804{
805 struct eap_sim_attrs eattr;
806 u8 *decrypted;
807
808 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Reauthentication");
809
810 if (data->reauth_id == NULL) {
811 wpa_printf(MSG_WARNING, "EAP-SIM: Server is trying "
812 "reauthentication, but no reauth_id available");
813 return eap_sim_client_error(data, id,
814 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
815 }
816
817 data->reauth = 1;
818 if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
819 {
820 wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication "
821 "did not have valid AT_MAC");
822 return eap_sim_client_error(data, id,
823 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
824 }
825
826 if (attr->encr_data == NULL || attr->iv == NULL) {
827 wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication "
828 "message did not include encrypted data");
829 return eap_sim_client_error(data, id,
830 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
831 }
832
833 decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
834 attr->encr_data_len, attr->iv, &eattr,
835 0);
836 if (decrypted == NULL) {
837 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted "
838 "data from reauthentication message");
839 return eap_sim_client_error(data, id,
840 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
841 }
842
843 if (eattr.nonce_s == NULL || eattr.counter < 0) {
844 wpa_printf(MSG_INFO, "EAP-SIM: (encr) No%s%s in reauth packet",
845 !eattr.nonce_s ? " AT_NONCE_S" : "",
846 eattr.counter < 0 ? " AT_COUNTER" : "");
847 os_free(decrypted);
848 return eap_sim_client_error(data, id,
849 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
850 }
851
852 if (eattr.counter < 0 || (size_t) eattr.counter <= data->counter) {
853 wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid counter "
854 "(%d <= %d)", eattr.counter, data->counter);
855 data->counter_too_small = eattr.counter;
856 /* Reply using Re-auth w/ AT_COUNTER_TOO_SMALL. The current
857 * reauth_id must not be used to start a new reauthentication.
858 * However, since it was used in the last EAP-Response-Identity
859 * packet, it has to saved for the following fullauth to be
860 * used in MK derivation. */
861 os_free(data->last_eap_identity);
862 data->last_eap_identity = data->reauth_id;
863 data->last_eap_identity_len = data->reauth_id_len;
864 data->reauth_id = NULL;
865 data->reauth_id_len = 0;
866 os_free(decrypted);
5d65ca51 867 return eap_sim_response_reauth(data, id, 1, eattr.nonce_s);
6fc6879b
JM		 868 }
869 data->counter = eattr.counter;
870
871 os_memcpy(data->nonce_s, eattr.nonce_s, EAP_SIM_NONCE_S_LEN);
872 wpa_hexdump(MSG_DEBUG, "EAP-SIM: (encr) AT_NONCE_S",
873 data->nonce_s, EAP_SIM_NONCE_S_LEN);
874
875 eap_sim_derive_keys_reauth(data->counter,
876 data->reauth_id, data->reauth_id_len,
877 data->nonce_s, data->mk, data->msk,
878 data->emsk);
879 eap_sim_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
a6689be8 880 eap_sim_learn_ids(sm, data, &eattr);
6fc6879b
JM		 881
882 if (data->result_ind && attr->result_ind)
883 data->use_result_ind = 1;
884
885 if (data->state != FAILURE && data->state != RESULT_FAILURE) {
886 eap_sim_state(data, data->use_result_ind ?
887 RESULT_SUCCESS : SUCCESS);
888 }
889
890 data->num_id_req = 0;
891 data->num_notification = 0;
892 if (data->counter > EAP_SIM_MAX_FAST_REAUTHS) {
893 wpa_printf(MSG_DEBUG, "EAP-SIM: Maximum number of "
894 "fast reauths performed - force fullauth");
895 eap_sim_clear_identities(data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
896 }
897 os_free(decrypted);
5d65ca51 898 return eap_sim_response_reauth(data, id, 0, data->nonce_s);
6fc6879b
JM		 899}
900
901
902static struct wpabuf * eap_sim_process(struct eap_sm *sm, void *priv,
903 struct eap_method_ret *ret,
904 const struct wpabuf *reqData)
905{
906 struct eap_sim_data *data = priv;
907 const struct eap_hdr *req;
908 u8 subtype, id;
909 struct wpabuf *res;
910 const u8 *pos;
911 struct eap_sim_attrs attr;
912 size_t len;
913
914 wpa_hexdump_buf(MSG_DEBUG, "EAP-SIM: EAP data", reqData);
915 if (eap_get_config_identity(sm, &len) == NULL) {
916 wpa_printf(MSG_INFO, "EAP-SIM: Identity not configured");
917 eap_sm_request_identity(sm);
918 ret->ignore = TRUE;
919 return NULL;
920 }
921
922 pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_SIM, reqData, &len);
923 if (pos == NULL || len < 1) {
924 ret->ignore = TRUE;
925 return NULL;
926 }
927 req = wpabuf_head(reqData);
928 id = req->identifier;
929 len = be_to_host16(req->length);
930
931 ret->ignore = FALSE;
932 ret->methodState = METHOD_MAY_CONT;
933 ret->decision = DECISION_FAIL;
934 ret->allowNotifications = TRUE;
935
936 subtype = *pos++;
937 wpa_printf(MSG_DEBUG, "EAP-SIM: Subtype=%d", subtype);
938 pos += 2; /* Reserved */
939
940 if (eap_sim_parse_attr(pos, wpabuf_head_u8(reqData) + len, &attr, 0,
941 0)) {
942 res = eap_sim_client_error(data, id,
943 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
944 goto done;
945 }
946
947 switch (subtype) {
948 case EAP_SIM_SUBTYPE_START:
949 res = eap_sim_process_start(sm, data, id, &attr);
950 break;
951 case EAP_SIM_SUBTYPE_CHALLENGE:
952 res = eap_sim_process_challenge(sm, data, id, reqData, &attr);
953 break;
954 case EAP_SIM_SUBTYPE_NOTIFICATION:
955 res = eap_sim_process_notification(sm, data, id, reqData,
956 &attr);
957 break;
958 case EAP_SIM_SUBTYPE_REAUTHENTICATION:
959 res = eap_sim_process_reauthentication(sm, data, id, reqData,
960 &attr);
961 break;
962 case EAP_SIM_SUBTYPE_CLIENT_ERROR:
963 wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Client-Error");
964 res = eap_sim_client_error(data, id,
965 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
966 break;
967 default:
968 wpa_printf(MSG_DEBUG, "EAP-SIM: Unknown subtype=%d", subtype);
969 res = eap_sim_client_error(data, id,
970 EAP_SIM_UNABLE_TO_PROCESS_PACKET);
971 break;
972 }
973
974done:
975 if (data->state == FAILURE) {
976 ret->decision = DECISION_FAIL;
977 ret->methodState = METHOD_DONE;
978 } else if (data->state == SUCCESS) {
979 ret->decision = data->use_result_ind ?
980 DECISION_UNCOND_SUCC : DECISION_COND_SUCC;
981 ret->methodState = data->use_result_ind ?
982 METHOD_DONE : METHOD_MAY_CONT;
983 } else if (data->state == RESULT_FAILURE)
984 ret->methodState = METHOD_CONT;
985 else if (data->state == RESULT_SUCCESS)
986 ret->methodState = METHOD_CONT;
987
988 if (ret->methodState == METHOD_DONE) {
989 ret->allowNotifications = FALSE;
990 }
991
992 return res;
993}
994
995
996static Boolean eap_sim_has_reauth_data(struct eap_sm *sm, void *priv)
997{
998 struct eap_sim_data *data = priv;
999 return data->pseudonym || data->reauth_id;
1000}
1001
1002
1003static void eap_sim_deinit_for_reauth(struct eap_sm *sm, void *priv)
1004{
1005 struct eap_sim_data *data = priv;
1006 eap_sim_clear_identities(data, CLEAR_EAP_ID);
1007 data->use_result_ind = 0;
1008}
1009
1010
1011static void * eap_sim_init_for_reauth(struct eap_sm *sm, void *priv)
1012{
1013 struct eap_sim_data *data = priv;
3642c431 1014 if (random_get_bytes(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) {
6fc6879b
JM		 1015 wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data "
1016 "for NONCE_MT");
1017 os_free(data);
1018 return NULL;
1019 }
1020 data->num_id_req = 0;
1021 data->num_notification = 0;
1022 eap_sim_state(data, CONTINUE);
1023 return priv;
1024}
1025
1026
1027static const u8 * eap_sim_get_identity(struct eap_sm *sm, void *priv,
1028 size_t *len)
1029{
1030 struct eap_sim_data *data = priv;
1031
1032 if (data->reauth_id) {
1033 *len = data->reauth_id_len;
1034 return data->reauth_id;
1035 }
1036
1037 if (data->pseudonym) {
1038 *len = data->pseudonym_len;
1039 return data->pseudonym;
1040 }
1041
1042 return NULL;
1043}
1044
1045
1046static Boolean eap_sim_isKeyAvailable(struct eap_sm *sm, void *priv)
1047{
1048 struct eap_sim_data *data = priv;
1049 return data->state == SUCCESS;
1050}
1051
1052
1053static u8 * eap_sim_getKey(struct eap_sm *sm, void *priv, size_t *len)
1054{
1055 struct eap_sim_data *data = priv;
1056 u8 *key;
1057
1058 if (data->state != SUCCESS)
1059 return NULL;
1060
1061 key = os_malloc(EAP_SIM_KEYING_DATA_LEN);
1062 if (key == NULL)
1063 return NULL;
1064
1065 *len = EAP_SIM_KEYING_DATA_LEN;
1066 os_memcpy(key, data->msk, EAP_SIM_KEYING_DATA_LEN);
1067
1068 return key;
1069}
1070
1071
1072static u8 * eap_sim_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1073{
1074 struct eap_sim_data *data = priv;
1075 u8 *key;
1076
1077 if (data->state != SUCCESS)
1078 return NULL;
1079
1080 key = os_malloc(EAP_EMSK_LEN);
1081 if (key == NULL)
1082 return NULL;
1083
1084 *len = EAP_EMSK_LEN;
1085 os_memcpy(key, data->emsk, EAP_EMSK_LEN);
1086
1087 return key;
1088}
1089
1090
1091int eap_peer_sim_register(void)
1092{
1093 struct eap_method *eap;
1094 int ret;
1095
1096 eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1097 EAP_VENDOR_IETF, EAP_TYPE_SIM, "SIM");
1098 if (eap == NULL)
1099 return -1;
1100
1101 eap->init = eap_sim_init;
1102 eap->deinit = eap_sim_deinit;
1103 eap->process = eap_sim_process;
1104 eap->isKeyAvailable = eap_sim_isKeyAvailable;
1105 eap->getKey = eap_sim_getKey;
1106 eap->has_reauth_data = eap_sim_has_reauth_data;
1107 eap->deinit_for_reauth = eap_sim_deinit_for_reauth;
1108 eap->init_for_reauth = eap_sim_init_for_reauth;
1109 eap->get_identity = eap_sim_get_identity;
1110 eap->get_emsk = eap_sim_get_emsk;
1111
1112 ret = eap_peer_method_register(eap);
1113 if (ret)
1114 eap_peer_method_free(eap);
1115 return ret;
1116}
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