Line data Source code
1 : /*
2 : * EAP peer method: EAP-SIM (RFC 4186)
3 : * Copyright (c) 2004-2012, Jouni Malinen <j@w1.fi>
4 : *
5 : * This software may be distributed under the terms of the BSD license.
6 : * See README for more details.
7 : */
8 :
9 : #include "includes.h"
10 :
11 : #include "common.h"
12 : #include "pcsc_funcs.h"
13 : #include "crypto/milenage.h"
14 : #include "crypto/random.h"
15 : #include "eap_peer/eap_i.h"
16 : #include "eap_config.h"
17 : #include "eap_common/eap_sim_common.h"
18 :
19 :
20 : struct eap_sim_data {
21 : u8 *ver_list;
22 : size_t ver_list_len;
23 : int selected_version;
24 : size_t min_num_chal, num_chal;
25 :
26 : u8 kc[3][EAP_SIM_KC_LEN];
27 : u8 sres[3][EAP_SIM_SRES_LEN];
28 : u8 nonce_mt[EAP_SIM_NONCE_MT_LEN], nonce_s[EAP_SIM_NONCE_S_LEN];
29 : u8 mk[EAP_SIM_MK_LEN];
30 : u8 k_aut[EAP_SIM_K_AUT_LEN];
31 : u8 k_encr[EAP_SIM_K_ENCR_LEN];
32 : u8 msk[EAP_SIM_KEYING_DATA_LEN];
33 : u8 emsk[EAP_EMSK_LEN];
34 : u8 rand[3][GSM_RAND_LEN];
35 :
36 : int num_id_req, num_notification;
37 : u8 *pseudonym;
38 : size_t pseudonym_len;
39 : u8 *reauth_id;
40 : size_t reauth_id_len;
41 : int reauth;
42 : unsigned int counter, counter_too_small;
43 : u8 *last_eap_identity;
44 : size_t last_eap_identity_len;
45 : enum {
46 : CONTINUE, RESULT_SUCCESS, SUCCESS, FAILURE
47 : } state;
48 : int result_ind, use_result_ind;
49 : };
50 :
51 :
52 : #ifndef CONFIG_NO_STDOUT_DEBUG
53 310 : static const char * eap_sim_state_txt(int state)
54 : {
55 310 : switch (state) {
56 : case CONTINUE:
57 221 : return "CONTINUE";
58 : case RESULT_SUCCESS:
59 4 : return "RESULT_SUCCESS";
60 : case SUCCESS:
61 34 : return "SUCCESS";
62 : case FAILURE:
63 51 : return "FAILURE";
64 : default:
65 0 : return "?";
66 : }
67 : }
68 : #endif /* CONFIG_NO_STDOUT_DEBUG */
69 :
70 :
71 155 : static void eap_sim_state(struct eap_sim_data *data, int state)
72 : {
73 310 : wpa_printf(MSG_DEBUG, "EAP-SIM: %s -> %s",
74 155 : eap_sim_state_txt(data->state),
75 : eap_sim_state_txt(state));
76 155 : data->state = state;
77 155 : }
78 :
79 :
80 70 : static void * eap_sim_init(struct eap_sm *sm)
81 : {
82 : struct eap_sim_data *data;
83 70 : struct eap_peer_config *config = eap_get_config(sm);
84 :
85 70 : data = os_zalloc(sizeof(*data));
86 70 : if (data == NULL)
87 0 : return NULL;
88 :
89 70 : if (random_get_bytes(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) {
90 0 : wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data "
91 : "for NONCE_MT");
92 0 : os_free(data);
93 0 : return NULL;
94 : }
95 :
96 70 : data->min_num_chal = 2;
97 70 : if (config && config->phase1) {
98 4 : char *pos = os_strstr(config->phase1, "sim_min_num_chal=");
99 4 : if (pos) {
100 3 : data->min_num_chal = atoi(pos + 17);
101 3 : if (data->min_num_chal < 2 || data->min_num_chal > 3) {
102 2 : wpa_printf(MSG_WARNING, "EAP-SIM: Invalid "
103 : "sim_min_num_chal configuration "
104 : "(%lu, expected 2 or 3)",
105 : (unsigned long) data->min_num_chal);
106 2 : os_free(data);
107 2 : return NULL;
108 : }
109 1 : wpa_printf(MSG_DEBUG, "EAP-SIM: Set minimum number of "
110 : "challenges to %lu",
111 : (unsigned long) data->min_num_chal);
112 : }
113 :
114 2 : data->result_ind = os_strstr(config->phase1, "result_ind=1") !=
115 : NULL;
116 : }
117 :
118 68 : if (config && config->anonymous_identity) {
119 1 : data->pseudonym = os_malloc(config->anonymous_identity_len);
120 1 : if (data->pseudonym) {
121 1 : os_memcpy(data->pseudonym, config->anonymous_identity,
122 : config->anonymous_identity_len);
123 1 : data->pseudonym_len = config->anonymous_identity_len;
124 : }
125 : }
126 :
127 68 : eap_sim_state(data, CONTINUE);
128 :
129 68 : return data;
130 : }
131 :
132 :
133 79 : static void eap_sim_clear_keys(struct eap_sim_data *data, int reauth)
134 : {
135 79 : if (!reauth) {
136 68 : os_memset(data->mk, 0, EAP_SIM_MK_LEN);
137 68 : os_memset(data->k_aut, 0, EAP_SIM_K_AUT_LEN);
138 68 : os_memset(data->k_encr, 0, EAP_SIM_K_ENCR_LEN);
139 : }
140 79 : os_memset(data->kc, 0, 3 * EAP_SIM_KC_LEN);
141 79 : os_memset(data->sres, 0, 3 * EAP_SIM_SRES_LEN);
142 79 : os_memset(data->msk, 0, EAP_SIM_KEYING_DATA_LEN);
143 79 : os_memset(data->emsk, 0, EAP_EMSK_LEN);
144 79 : }
145 :
146 :
147 68 : static void eap_sim_deinit(struct eap_sm *sm, void *priv)
148 : {
149 68 : struct eap_sim_data *data = priv;
150 68 : if (data) {
151 68 : os_free(data->ver_list);
152 68 : os_free(data->pseudonym);
153 68 : os_free(data->reauth_id);
154 68 : os_free(data->last_eap_identity);
155 68 : eap_sim_clear_keys(data, 0);
156 68 : os_free(data);
157 : }
158 68 : }
159 :
160 :
161 11 : static int eap_sim_ext_sim_req(struct eap_sm *sm, struct eap_sim_data *data)
162 : {
163 : char req[200], *pos, *end;
164 : size_t i;
165 :
166 11 : wpa_printf(MSG_DEBUG, "EAP-SIM: Use external SIM processing");
167 11 : pos = req;
168 11 : end = pos + sizeof(req);
169 11 : pos += os_snprintf(pos, end - pos, "GSM-AUTH");
170 44 : for (i = 0; i < data->num_chal; i++) {
171 33 : pos += os_snprintf(pos, end - pos, ":");
172 33 : pos += wpa_snprintf_hex(pos, end - pos, data->rand[i],
173 : GSM_RAND_LEN);
174 : }
175 :
176 11 : eap_sm_request_sim(sm, req);
177 11 : return 1;
178 : }
179 :
180 :
181 11 : static int eap_sim_ext_sim_result(struct eap_sm *sm, struct eap_sim_data *data,
182 : struct eap_peer_config *conf)
183 : {
184 : char *resp, *pos;
185 : size_t i;
186 :
187 11 : wpa_printf(MSG_DEBUG,
188 : "EAP-SIM: Use result from external SIM processing");
189 :
190 11 : resp = conf->external_sim_resp;
191 11 : conf->external_sim_resp = NULL;
192 :
193 11 : if (os_strncmp(resp, "GSM-AUTH:", 9) != 0) {
194 1 : wpa_printf(MSG_DEBUG, "EAP-SIM: Unrecognized external SIM processing response");
195 1 : os_free(resp);
196 1 : return -1;
197 : }
198 :
199 10 : pos = resp + 9;
200 23 : for (i = 0; i < data->num_chal; i++) {
201 19 : wpa_hexdump(MSG_DEBUG, "EAP-SIM: RAND",
202 19 : data->rand[i], GSM_RAND_LEN);
203 :
204 19 : if (hexstr2bin(pos, data->kc[i], EAP_SIM_KC_LEN) < 0)
205 3 : goto invalid;
206 16 : wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: Kc",
207 16 : data->kc[i], EAP_SIM_KC_LEN);
208 16 : pos += EAP_SIM_KC_LEN * 2;
209 16 : if (*pos != ':')
210 1 : goto invalid;
211 15 : pos++;
212 :
213 15 : if (hexstr2bin(pos, data->sres[i], EAP_SIM_SRES_LEN) < 0)
214 1 : goto invalid;
215 14 : wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: SRES",
216 14 : data->sres[i], EAP_SIM_SRES_LEN);
217 14 : pos += EAP_SIM_SRES_LEN * 2;
218 14 : if (i + 1 < data->num_chal) {
219 10 : if (*pos != ':')
220 1 : goto invalid;
221 9 : pos++;
222 : }
223 : }
224 :
225 4 : os_free(resp);
226 4 : return 0;
227 :
228 : invalid:
229 6 : wpa_printf(MSG_DEBUG, "EAP-SIM: Invalid external SIM processing GSM-AUTH response");
230 6 : os_free(resp);
231 6 : return -1;
232 : }
233 :
234 :
235 56 : static int eap_sim_gsm_auth(struct eap_sm *sm, struct eap_sim_data *data)
236 : {
237 : struct eap_peer_config *conf;
238 :
239 56 : wpa_printf(MSG_DEBUG, "EAP-SIM: GSM authentication algorithm");
240 :
241 56 : conf = eap_get_config(sm);
242 56 : if (conf == NULL)
243 0 : return -1;
244 :
245 56 : if (sm->external_sim) {
246 22 : if (conf->external_sim_resp)
247 11 : return eap_sim_ext_sim_result(sm, data, conf);
248 : else
249 11 : return eap_sim_ext_sim_req(sm, data);
250 : }
251 :
252 34 : if (conf->pcsc) {
253 : if (scard_gsm_auth(sm->scard_ctx, data->rand[0],
254 : data->sres[0], data->kc[0]) ||
255 : scard_gsm_auth(sm->scard_ctx, data->rand[1],
256 : data->sres[1], data->kc[1]) ||
257 : (data->num_chal > 2 &&
258 : scard_gsm_auth(sm->scard_ctx, data->rand[2],
259 : data->sres[2], data->kc[2]))) {
260 0 : wpa_printf(MSG_DEBUG, "EAP-SIM: GSM SIM "
261 : "authentication could not be completed");
262 0 : return -1;
263 : }
264 : return 0;
265 : }
266 :
267 : #ifdef CONFIG_SIM_SIMULATOR
268 34 : if (conf->password) {
269 : u8 opc[16], k[16];
270 : const char *pos;
271 : size_t i;
272 33 : wpa_printf(MSG_DEBUG, "EAP-SIM: Use internal GSM-Milenage "
273 : "implementation for authentication");
274 33 : if (conf->password_len < 65) {
275 1 : wpa_printf(MSG_DEBUG, "EAP-SIM: invalid GSM-Milenage "
276 : "password");
277 1 : return -1;
278 : }
279 32 : pos = (const char *) conf->password;
280 32 : if (hexstr2bin(pos, k, 16))
281 1 : return -1;
282 31 : pos += 32;
283 31 : if (*pos != ':')
284 1 : return -1;
285 30 : pos++;
286 :
287 30 : if (hexstr2bin(pos, opc, 16))
288 1 : return -1;
289 :
290 92 : for (i = 0; i < data->num_chal; i++) {
291 75 : if (gsm_milenage(opc, k, data->rand[i],
292 75 : data->sres[i], data->kc[i])) {
293 12 : wpa_printf(MSG_DEBUG, "EAP-SIM: "
294 : "GSM-Milenage authentication "
295 : "could not be completed");
296 12 : return -1;
297 : }
298 63 : wpa_hexdump(MSG_DEBUG, "EAP-SIM: RAND",
299 63 : data->rand[i], GSM_RAND_LEN);
300 63 : wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: SRES",
301 63 : data->sres[i], EAP_SIM_SRES_LEN);
302 63 : wpa_hexdump_key(MSG_DEBUG, "EAP-SIM: Kc",
303 63 : data->kc[i], EAP_SIM_KC_LEN);
304 : }
305 17 : return 0;
306 : }
307 : #endif /* CONFIG_SIM_SIMULATOR */
308 :
309 : #ifdef CONFIG_SIM_HARDCODED
310 : /* These hardcoded Kc and SRES values are used for testing. RAND to
311 : * KC/SREC mapping is very bogus as far as real authentication is
312 : * concerned, but it is quite useful for cases where the AS is rotating
313 : * the order of pre-configured values. */
314 : {
315 : size_t i;
316 :
317 : wpa_printf(MSG_DEBUG, "EAP-SIM: Use hardcoded Kc and SRES "
318 : "values for testing");
319 :
320 : for (i = 0; i < data->num_chal; i++) {
321 : if (data->rand[i][0] == 0xaa) {
322 : os_memcpy(data->kc[i],
323 : "\xa0\xa1\xa2\xa3\xa4\xa5\xa6\xa7",
324 : EAP_SIM_KC_LEN);
325 : os_memcpy(data->sres[i], "\xd1\xd2\xd3\xd4",
326 : EAP_SIM_SRES_LEN);
327 : } else if (data->rand[i][0] == 0xbb) {
328 : os_memcpy(data->kc[i],
329 : "\xb0\xb1\xb2\xb3\xb4\xb5\xb6\xb7",
330 : EAP_SIM_KC_LEN);
331 : os_memcpy(data->sres[i], "\xe1\xe2\xe3\xe4",
332 : EAP_SIM_SRES_LEN);
333 : } else {
334 : os_memcpy(data->kc[i],
335 : "\xc0\xc1\xc2\xc3\xc4\xc5\xc6\xc7",
336 : EAP_SIM_KC_LEN);
337 : os_memcpy(data->sres[i], "\xf1\xf2\xf3\xf4",
338 : EAP_SIM_SRES_LEN);
339 : }
340 : }
341 : }
342 :
343 : return 0;
344 :
345 : #else /* CONFIG_SIM_HARDCODED */
346 :
347 1 : wpa_printf(MSG_DEBUG, "EAP-SIM: No GSM authentication algorithm "
348 : "enabled");
349 1 : return -1;
350 :
351 : #endif /* CONFIG_SIM_HARDCODED */
352 : }
353 :
354 :
355 68 : static int eap_sim_supported_ver(int version)
356 : {
357 68 : return version == EAP_SIM_VERSION;
358 : }
359 :
360 :
361 : #define CLEAR_PSEUDONYM 0x01
362 : #define CLEAR_REAUTH_ID 0x02
363 : #define CLEAR_EAP_ID 0x04
364 :
365 152 : static void eap_sim_clear_identities(struct eap_sm *sm,
366 : struct eap_sim_data *data, int id)
367 : {
368 152 : if ((id & CLEAR_PSEUDONYM) && data->pseudonym) {
369 2 : wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old pseudonym");
370 2 : os_free(data->pseudonym);
371 2 : data->pseudonym = NULL;
372 2 : data->pseudonym_len = 0;
373 2 : eap_set_anon_id(sm, NULL, 0);
374 : }
375 152 : if ((id & CLEAR_REAUTH_ID) && data->reauth_id) {
376 7 : wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old reauth_id");
377 7 : os_free(data->reauth_id);
378 7 : data->reauth_id = NULL;
379 7 : data->reauth_id_len = 0;
380 : }
381 152 : if ((id & CLEAR_EAP_ID) && data->last_eap_identity) {
382 1 : wpa_printf(MSG_DEBUG, "EAP-SIM: forgetting old eap_id");
383 1 : os_free(data->last_eap_identity);
384 1 : data->last_eap_identity = NULL;
385 1 : data->last_eap_identity_len = 0;
386 : }
387 152 : }
388 :
389 :
390 25 : static int eap_sim_learn_ids(struct eap_sm *sm, struct eap_sim_data *data,
391 : struct eap_sim_attrs *attr)
392 : {
393 25 : if (attr->next_pseudonym) {
394 20 : const u8 *identity = NULL;
395 20 : size_t identity_len = 0;
396 20 : const u8 *realm = NULL;
397 20 : size_t realm_len = 0;
398 :
399 40 : wpa_hexdump_ascii(MSG_DEBUG,
400 : "EAP-SIM: (encr) AT_NEXT_PSEUDONYM",
401 20 : attr->next_pseudonym,
402 : attr->next_pseudonym_len);
403 20 : os_free(data->pseudonym);
404 : /* Look for the realm of the permanent identity */
405 20 : identity = eap_get_config_identity(sm, &identity_len);
406 20 : if (identity) {
407 360 : for (realm = identity, realm_len = identity_len;
408 320 : realm_len > 0; realm_len--, realm++) {
409 328 : if (*realm == '@')
410 8 : break;
411 : }
412 : }
413 20 : data->pseudonym = os_malloc(attr->next_pseudonym_len +
414 : realm_len);
415 20 : if (data->pseudonym == NULL) {
416 0 : wpa_printf(MSG_INFO, "EAP-SIM: (encr) No memory for "
417 : "next pseudonym");
418 0 : data->pseudonym_len = 0;
419 0 : return -1;
420 : }
421 20 : os_memcpy(data->pseudonym, attr->next_pseudonym,
422 : attr->next_pseudonym_len);
423 20 : if (realm_len) {
424 8 : os_memcpy(data->pseudonym + attr->next_pseudonym_len,
425 : realm, realm_len);
426 : }
427 20 : data->pseudonym_len = attr->next_pseudonym_len + realm_len;
428 20 : eap_set_anon_id(sm, data->pseudonym, data->pseudonym_len);
429 : }
430 :
431 25 : if (attr->next_reauth_id) {
432 24 : os_free(data->reauth_id);
433 24 : data->reauth_id = os_malloc(attr->next_reauth_id_len);
434 24 : if (data->reauth_id == NULL) {
435 0 : wpa_printf(MSG_INFO, "EAP-SIM: (encr) No memory for "
436 : "next reauth_id");
437 0 : data->reauth_id_len = 0;
438 0 : return -1;
439 : }
440 24 : os_memcpy(data->reauth_id, attr->next_reauth_id,
441 : attr->next_reauth_id_len);
442 24 : data->reauth_id_len = attr->next_reauth_id_len;
443 48 : wpa_hexdump_ascii(MSG_DEBUG,
444 : "EAP-SIM: (encr) AT_NEXT_REAUTH_ID",
445 24 : data->reauth_id,
446 : data->reauth_id_len);
447 : }
448 :
449 25 : return 0;
450 : }
451 :
452 :
453 48 : static struct wpabuf * eap_sim_client_error(struct eap_sim_data *data, u8 id,
454 : int err)
455 : {
456 : struct eap_sim_msg *msg;
457 :
458 48 : eap_sim_state(data, FAILURE);
459 48 : data->num_id_req = 0;
460 48 : data->num_notification = 0;
461 :
462 48 : wpa_printf(MSG_DEBUG, "EAP-SIM: Send Client-Error (error code %d)",
463 : err);
464 48 : msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
465 : EAP_SIM_SUBTYPE_CLIENT_ERROR);
466 48 : eap_sim_msg_add(msg, EAP_SIM_AT_CLIENT_ERROR_CODE, err, NULL, 0);
467 48 : return eap_sim_msg_finish(msg, EAP_TYPE_SIM, NULL, NULL, 0);
468 : }
469 :
470 :
471 64 : static struct wpabuf * eap_sim_response_start(struct eap_sm *sm,
472 : struct eap_sim_data *data, u8 id,
473 : enum eap_sim_id_req id_req)
474 : {
475 64 : const u8 *identity = NULL;
476 64 : size_t identity_len = 0;
477 : struct eap_sim_msg *msg;
478 :
479 64 : data->reauth = 0;
480 64 : if (id_req == ANY_ID && data->reauth_id) {
481 9 : identity = data->reauth_id;
482 9 : identity_len = data->reauth_id_len;
483 9 : data->reauth = 1;
484 105 : } else if ((id_req == ANY_ID || id_req == FULLAUTH_ID) &&
485 50 : data->pseudonym) {
486 3 : identity = data->pseudonym;
487 3 : identity_len = data->pseudonym_len;
488 3 : eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID);
489 52 : } else if (id_req != NO_ID_REQ) {
490 50 : identity = eap_get_config_identity(sm, &identity_len);
491 50 : if (identity) {
492 50 : eap_sim_clear_identities(sm, data, CLEAR_PSEUDONYM |
493 : CLEAR_REAUTH_ID);
494 : }
495 : }
496 64 : if (id_req != NO_ID_REQ)
497 62 : eap_sim_clear_identities(sm, data, CLEAR_EAP_ID);
498 :
499 64 : wpa_printf(MSG_DEBUG, "Generating EAP-SIM Start (id=%d)", id);
500 64 : msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id,
501 : EAP_TYPE_SIM, EAP_SIM_SUBTYPE_START);
502 64 : if (!data->reauth) {
503 55 : wpa_hexdump(MSG_DEBUG, " AT_NONCE_MT",
504 55 : data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
505 55 : eap_sim_msg_add(msg, EAP_SIM_AT_NONCE_MT, 0,
506 55 : data->nonce_mt, EAP_SIM_NONCE_MT_LEN);
507 55 : wpa_printf(MSG_DEBUG, " AT_SELECTED_VERSION %d",
508 : data->selected_version);
509 55 : eap_sim_msg_add(msg, EAP_SIM_AT_SELECTED_VERSION,
510 55 : data->selected_version, NULL, 0);
511 : }
512 :
513 64 : if (identity) {
514 62 : wpa_hexdump_ascii(MSG_DEBUG, " AT_IDENTITY",
515 : identity, identity_len);
516 62 : eap_sim_msg_add(msg, EAP_SIM_AT_IDENTITY, identity_len,
517 : identity, identity_len);
518 : }
519 :
520 64 : return eap_sim_msg_finish(msg, EAP_TYPE_SIM, NULL, NULL, 0);
521 : }
522 :
523 :
524 20 : static struct wpabuf * eap_sim_response_challenge(struct eap_sim_data *data,
525 : u8 id)
526 : {
527 : struct eap_sim_msg *msg;
528 :
529 20 : wpa_printf(MSG_DEBUG, "Generating EAP-SIM Challenge (id=%d)", id);
530 20 : msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
531 : EAP_SIM_SUBTYPE_CHALLENGE);
532 20 : if (data->use_result_ind) {
533 1 : wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
534 1 : eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
535 : }
536 20 : wpa_printf(MSG_DEBUG, " AT_MAC");
537 20 : eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
538 40 : return eap_sim_msg_finish(msg, EAP_TYPE_SIM, data->k_aut,
539 20 : (u8 *) data->sres,
540 20 : data->num_chal * EAP_SIM_SRES_LEN);
541 : }
542 :
543 :
544 6 : static struct wpabuf * eap_sim_response_reauth(struct eap_sim_data *data,
545 : u8 id, int counter_too_small,
546 : const u8 *nonce_s)
547 : {
548 : struct eap_sim_msg *msg;
549 : unsigned int counter;
550 :
551 6 : wpa_printf(MSG_DEBUG, "Generating EAP-SIM Reauthentication (id=%d)",
552 : id);
553 6 : msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id, EAP_TYPE_SIM,
554 : EAP_SIM_SUBTYPE_REAUTHENTICATION);
555 6 : wpa_printf(MSG_DEBUG, " AT_IV");
556 6 : wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
557 6 : eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV, EAP_SIM_AT_ENCR_DATA);
558 :
559 6 : if (counter_too_small) {
560 1 : wpa_printf(MSG_DEBUG, " *AT_COUNTER_TOO_SMALL");
561 1 : eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER_TOO_SMALL, 0, NULL, 0);
562 1 : counter = data->counter_too_small;
563 : } else
564 5 : counter = data->counter;
565 :
566 6 : wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", counter);
567 6 : eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, counter, NULL, 0);
568 :
569 6 : if (eap_sim_msg_add_encr_end(msg, data->k_encr, EAP_SIM_AT_PADDING)) {
570 0 : wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt "
571 : "AT_ENCR_DATA");
572 0 : eap_sim_msg_free(msg);
573 0 : return NULL;
574 : }
575 6 : if (data->use_result_ind) {
576 1 : wpa_printf(MSG_DEBUG, " AT_RESULT_IND");
577 1 : eap_sim_msg_add(msg, EAP_SIM_AT_RESULT_IND, 0, NULL, 0);
578 : }
579 6 : wpa_printf(MSG_DEBUG, " AT_MAC");
580 6 : eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
581 6 : return eap_sim_msg_finish(msg, EAP_TYPE_SIM, data->k_aut, nonce_s,
582 : EAP_SIM_NONCE_S_LEN);
583 : }
584 :
585 :
586 6 : static struct wpabuf * eap_sim_response_notification(struct eap_sim_data *data,
587 : u8 id, u16 notification)
588 : {
589 : struct eap_sim_msg *msg;
590 6 : u8 *k_aut = (notification & 0x4000) == 0 ? data->k_aut : NULL;
591 :
592 6 : wpa_printf(MSG_DEBUG, "Generating EAP-SIM Notification (id=%d)", id);
593 6 : msg = eap_sim_msg_init(EAP_CODE_RESPONSE, id,
594 : EAP_TYPE_SIM, EAP_SIM_SUBTYPE_NOTIFICATION);
595 6 : if (k_aut && data->reauth) {
596 1 : wpa_printf(MSG_DEBUG, " AT_IV");
597 1 : wpa_printf(MSG_DEBUG, " AT_ENCR_DATA");
598 1 : eap_sim_msg_add_encr_start(msg, EAP_SIM_AT_IV,
599 : EAP_SIM_AT_ENCR_DATA);
600 1 : wpa_printf(MSG_DEBUG, " *AT_COUNTER %d", data->counter);
601 1 : eap_sim_msg_add(msg, EAP_SIM_AT_COUNTER, data->counter,
602 : NULL, 0);
603 1 : if (eap_sim_msg_add_encr_end(msg, data->k_encr,
604 : EAP_SIM_AT_PADDING)) {
605 0 : wpa_printf(MSG_WARNING, "EAP-SIM: Failed to encrypt "
606 : "AT_ENCR_DATA");
607 0 : eap_sim_msg_free(msg);
608 0 : return NULL;
609 : }
610 : }
611 6 : if (k_aut) {
612 2 : wpa_printf(MSG_DEBUG, " AT_MAC");
613 2 : eap_sim_msg_add_mac(msg, EAP_SIM_AT_MAC);
614 : }
615 6 : return eap_sim_msg_finish(msg, EAP_TYPE_SIM, k_aut, (u8 *) "", 0);
616 : }
617 :
618 :
619 69 : static struct wpabuf * eap_sim_process_start(struct eap_sm *sm,
620 : struct eap_sim_data *data, u8 id,
621 : struct eap_sim_attrs *attr)
622 : {
623 69 : int selected_version = -1, id_error;
624 : size_t i;
625 : u8 *pos;
626 :
627 69 : wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Start");
628 69 : if (attr->version_list == NULL) {
629 1 : wpa_printf(MSG_INFO, "EAP-SIM: No AT_VERSION_LIST in "
630 : "SIM/Start");
631 1 : return eap_sim_client_error(data, id,
632 : EAP_SIM_UNSUPPORTED_VERSION);
633 : }
634 :
635 68 : os_free(data->ver_list);
636 68 : data->ver_list = os_malloc(attr->version_list_len);
637 68 : if (data->ver_list == NULL) {
638 0 : wpa_printf(MSG_DEBUG, "EAP-SIM: Failed to allocate "
639 : "memory for version list");
640 0 : return eap_sim_client_error(data, id,
641 : EAP_SIM_UNABLE_TO_PROCESS_PACKET);
642 : }
643 68 : os_memcpy(data->ver_list, attr->version_list, attr->version_list_len);
644 68 : data->ver_list_len = attr->version_list_len;
645 68 : pos = data->ver_list;
646 69 : for (i = 0; i < data->ver_list_len / 2; i++) {
647 68 : int ver = pos[0] * 256 + pos[1];
648 68 : pos += 2;
649 68 : if (eap_sim_supported_ver(ver)) {
650 67 : selected_version = ver;
651 67 : break;
652 : }
653 : }
654 68 : if (selected_version < 0) {
655 1 : wpa_printf(MSG_INFO, "EAP-SIM: Could not find a supported "
656 : "version");
657 1 : return eap_sim_client_error(data, id,
658 : EAP_SIM_UNSUPPORTED_VERSION);
659 : }
660 67 : wpa_printf(MSG_DEBUG, "EAP-SIM: Selected Version %d",
661 : selected_version);
662 67 : data->selected_version = selected_version;
663 :
664 67 : id_error = 0;
665 67 : switch (attr->id_req) {
666 : case NO_ID_REQ:
667 2 : break;
668 : case ANY_ID:
669 56 : if (data->num_id_req > 0)
670 1 : id_error++;
671 56 : data->num_id_req++;
672 56 : break;
673 : case FULLAUTH_ID:
674 5 : if (data->num_id_req > 1)
675 1 : id_error++;
676 5 : data->num_id_req++;
677 5 : break;
678 : case PERMANENT_ID:
679 4 : if (data->num_id_req > 2)
680 1 : id_error++;
681 4 : data->num_id_req++;
682 4 : break;
683 : }
684 67 : if (id_error) {
685 3 : wpa_printf(MSG_INFO, "EAP-SIM: Too many ID requests "
686 : "used within one authentication");
687 3 : return eap_sim_client_error(data, id,
688 : EAP_SIM_UNABLE_TO_PROCESS_PACKET);
689 : }
690 :
691 64 : return eap_sim_response_start(sm, data, id, attr->id_req);
692 : }
693 :
694 :
695 61 : static struct wpabuf * eap_sim_process_challenge(struct eap_sm *sm,
696 : struct eap_sim_data *data,
697 : u8 id,
698 : const struct wpabuf *reqData,
699 : struct eap_sim_attrs *attr)
700 : {
701 : const u8 *identity;
702 : size_t identity_len;
703 : struct eap_sim_attrs eattr;
704 : int res;
705 :
706 61 : wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Challenge");
707 61 : data->reauth = 0;
708 61 : if (!attr->mac || !attr->rand) {
709 4 : wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message "
710 : "did not include%s%s",
711 2 : !attr->mac ? " AT_MAC" : "",
712 2 : !attr->rand ? " AT_RAND" : "");
713 2 : return eap_sim_client_error(data, id,
714 : EAP_SIM_UNABLE_TO_PROCESS_PACKET);
715 : }
716 :
717 59 : wpa_printf(MSG_DEBUG, "EAP-SIM: %lu challenges",
718 : (unsigned long) attr->num_chal);
719 59 : if (attr->num_chal < data->min_num_chal) {
720 1 : wpa_printf(MSG_INFO, "EAP-SIM: Insufficient number of "
721 : "challenges (%lu)", (unsigned long) attr->num_chal);
722 1 : return eap_sim_client_error(data, id,
723 : EAP_SIM_INSUFFICIENT_NUM_OF_CHAL);
724 : }
725 58 : if (attr->num_chal > 3) {
726 1 : wpa_printf(MSG_INFO, "EAP-SIM: Too many challenges "
727 : "(%lu)", (unsigned long) attr->num_chal);
728 1 : return eap_sim_client_error(data, id,
729 : EAP_SIM_UNABLE_TO_PROCESS_PACKET);
730 : }
731 :
732 : /* Verify that RANDs are different */
733 57 : if (os_memcmp(attr->rand, attr->rand + GSM_RAND_LEN,
734 57 : GSM_RAND_LEN) == 0 ||
735 114 : (attr->num_chal > 2 &&
736 57 : (os_memcmp(attr->rand, attr->rand + 2 * GSM_RAND_LEN,
737 56 : GSM_RAND_LEN) == 0 ||
738 56 : os_memcmp(attr->rand + GSM_RAND_LEN,
739 : attr->rand + 2 * GSM_RAND_LEN,
740 : GSM_RAND_LEN) == 0))) {
741 1 : wpa_printf(MSG_INFO, "EAP-SIM: Same RAND used multiple times");
742 1 : return eap_sim_client_error(data, id,
743 : EAP_SIM_RAND_NOT_FRESH);
744 : }
745 :
746 56 : os_memcpy(data->rand, attr->rand, attr->num_chal * GSM_RAND_LEN);
747 56 : data->num_chal = attr->num_chal;
748 :
749 56 : res = eap_sim_gsm_auth(sm, data);
750 56 : if (res > 0) {
751 11 : wpa_printf(MSG_DEBUG, "EAP-SIM: Wait for external SIM processing");
752 11 : return NULL;
753 : }
754 45 : if (res) {
755 24 : wpa_printf(MSG_WARNING, "EAP-SIM: GSM authentication failed");
756 24 : return eap_sim_client_error(data, id,
757 : EAP_SIM_UNABLE_TO_PROCESS_PACKET);
758 : }
759 21 : if (data->last_eap_identity) {
760 1 : identity = data->last_eap_identity;
761 1 : identity_len = data->last_eap_identity_len;
762 20 : } else if (data->pseudonym) {
763 1 : identity = data->pseudonym;
764 1 : identity_len = data->pseudonym_len;
765 : } else
766 19 : identity = eap_get_config_identity(sm, &identity_len);
767 21 : wpa_hexdump_ascii(MSG_DEBUG, "EAP-SIM: Selected identity for MK "
768 : "derivation", identity, identity_len);
769 42 : eap_sim_derive_mk(identity, identity_len, data->nonce_mt,
770 21 : data->selected_version, data->ver_list,
771 21 : data->ver_list_len, data->num_chal,
772 21 : (const u8 *) data->kc, data->mk);
773 21 : eap_sim_derive_keys(data->mk, data->k_encr, data->k_aut, data->msk,
774 21 : data->emsk);
775 21 : if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, data->nonce_mt,
776 : EAP_SIM_NONCE_MT_LEN)) {
777 1 : wpa_printf(MSG_WARNING, "EAP-SIM: Challenge message "
778 : "used invalid AT_MAC");
779 1 : return eap_sim_client_error(data, id,
780 : EAP_SIM_UNABLE_TO_PROCESS_PACKET);
781 : }
782 :
783 : /* Old reauthentication identity must not be used anymore. In
784 : * other words, if no new reauth identity is received, full
785 : * authentication will be used on next reauthentication (using
786 : * pseudonym identity or permanent identity). */
787 20 : eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
788 :
789 20 : if (attr->encr_data) {
790 : u8 *decrypted;
791 20 : decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
792 : attr->encr_data_len, attr->iv,
793 : &eattr, 0);
794 20 : if (decrypted == NULL) {
795 0 : return eap_sim_client_error(
796 : data, id, EAP_SIM_UNABLE_TO_PROCESS_PACKET);
797 : }
798 20 : eap_sim_learn_ids(sm, data, &eattr);
799 20 : os_free(decrypted);
800 : }
801 :
802 20 : if (data->result_ind && attr->result_ind)
803 1 : data->use_result_ind = 1;
804 :
805 20 : if (data->state != FAILURE) {
806 20 : eap_sim_state(data, data->use_result_ind ?
807 : RESULT_SUCCESS : SUCCESS);
808 : }
809 :
810 20 : data->num_id_req = 0;
811 20 : data->num_notification = 0;
812 : /* RFC 4186 specifies that counter is initialized to one after
813 : * fullauth, but initializing it to zero makes it easier to implement
814 : * reauth verification. */
815 20 : data->counter = 0;
816 20 : return eap_sim_response_challenge(data, id);
817 : }
818 :
819 :
820 1 : static int eap_sim_process_notification_reauth(struct eap_sim_data *data,
821 : struct eap_sim_attrs *attr)
822 : {
823 : struct eap_sim_attrs eattr;
824 : u8 *decrypted;
825 :
826 1 : if (attr->encr_data == NULL || attr->iv == NULL) {
827 0 : wpa_printf(MSG_WARNING, "EAP-SIM: Notification message after "
828 : "reauth did not include encrypted data");
829 0 : return -1;
830 : }
831 :
832 1 : decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
833 : attr->encr_data_len, attr->iv, &eattr,
834 : 0);
835 1 : if (decrypted == NULL) {
836 0 : wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted "
837 : "data from notification message");
838 0 : return -1;
839 : }
840 :
841 1 : if (eattr.counter < 0 || (size_t) eattr.counter != data->counter) {
842 0 : wpa_printf(MSG_WARNING, "EAP-SIM: Counter in notification "
843 : "message does not match with counter in reauth "
844 : "message");
845 0 : os_free(decrypted);
846 0 : return -1;
847 : }
848 :
849 1 : os_free(decrypted);
850 1 : return 0;
851 : }
852 :
853 :
854 4 : static int eap_sim_process_notification_auth(struct eap_sim_data *data,
855 : const struct wpabuf *reqData,
856 : struct eap_sim_attrs *attr)
857 : {
858 4 : if (attr->mac == NULL) {
859 1 : wpa_printf(MSG_INFO, "EAP-SIM: no AT_MAC in after_auth "
860 : "Notification message");
861 1 : return -1;
862 : }
863 :
864 3 : if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
865 : {
866 1 : wpa_printf(MSG_WARNING, "EAP-SIM: Notification message "
867 : "used invalid AT_MAC");
868 1 : return -1;
869 : }
870 :
871 3 : if (data->reauth &&
872 1 : eap_sim_process_notification_reauth(data, attr)) {
873 0 : wpa_printf(MSG_WARNING, "EAP-SIM: Invalid notification "
874 : "message after reauth");
875 0 : return -1;
876 : }
877 :
878 2 : return 0;
879 : }
880 :
881 :
882 10 : static struct wpabuf * eap_sim_process_notification(
883 : struct eap_sm *sm, struct eap_sim_data *data, u8 id,
884 : const struct wpabuf *reqData, struct eap_sim_attrs *attr)
885 : {
886 10 : wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Notification");
887 10 : if (data->num_notification > 0) {
888 1 : wpa_printf(MSG_INFO, "EAP-SIM: too many notification "
889 : "rounds (only one allowed)");
890 1 : return eap_sim_client_error(data, id,
891 : EAP_SIM_UNABLE_TO_PROCESS_PACKET);
892 : }
893 9 : data->num_notification++;
894 9 : if (attr->notification == -1) {
895 1 : wpa_printf(MSG_INFO, "EAP-SIM: no AT_NOTIFICATION in "
896 : "Notification message");
897 1 : return eap_sim_client_error(data, id,
898 : EAP_SIM_UNABLE_TO_PROCESS_PACKET);
899 : }
900 :
901 12 : if ((attr->notification & 0x4000) == 0 &&
902 4 : eap_sim_process_notification_auth(data, reqData, attr)) {
903 2 : return eap_sim_client_error(data, id,
904 : EAP_SIM_UNABLE_TO_PROCESS_PACKET);
905 : }
906 :
907 6 : eap_sim_report_notification(sm->msg_ctx, attr->notification, 0);
908 6 : if (attr->notification >= 0 && attr->notification < 32768) {
909 3 : eap_sim_state(data, FAILURE);
910 5 : } else if (attr->notification == EAP_SIM_SUCCESS &&
911 2 : data->state == RESULT_SUCCESS)
912 2 : eap_sim_state(data, SUCCESS);
913 6 : return eap_sim_response_notification(data, id, attr->notification);
914 : }
915 :
916 :
917 8 : static struct wpabuf * eap_sim_process_reauthentication(
918 : struct eap_sm *sm, struct eap_sim_data *data, u8 id,
919 : const struct wpabuf *reqData, struct eap_sim_attrs *attr)
920 : {
921 : struct eap_sim_attrs eattr;
922 : u8 *decrypted;
923 :
924 8 : wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Reauthentication");
925 :
926 8 : if (data->reauth_id == NULL) {
927 1 : wpa_printf(MSG_WARNING, "EAP-SIM: Server is trying "
928 : "reauthentication, but no reauth_id available");
929 1 : return eap_sim_client_error(data, id,
930 : EAP_SIM_UNABLE_TO_PROCESS_PACKET);
931 : }
932 :
933 7 : data->reauth = 1;
934 7 : if (eap_sim_verify_mac(data->k_aut, reqData, attr->mac, (u8 *) "", 0))
935 : {
936 1 : wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication "
937 : "did not have valid AT_MAC");
938 1 : return eap_sim_client_error(data, id,
939 : EAP_SIM_UNABLE_TO_PROCESS_PACKET);
940 : }
941 :
942 6 : if (attr->encr_data == NULL || attr->iv == NULL) {
943 0 : wpa_printf(MSG_WARNING, "EAP-SIM: Reauthentication "
944 : "message did not include encrypted data");
945 0 : return eap_sim_client_error(data, id,
946 : EAP_SIM_UNABLE_TO_PROCESS_PACKET);
947 : }
948 :
949 6 : decrypted = eap_sim_parse_encr(data->k_encr, attr->encr_data,
950 : attr->encr_data_len, attr->iv, &eattr,
951 : 0);
952 6 : if (decrypted == NULL) {
953 0 : wpa_printf(MSG_WARNING, "EAP-SIM: Failed to parse encrypted "
954 : "data from reauthentication message");
955 0 : return eap_sim_client_error(data, id,
956 : EAP_SIM_UNABLE_TO_PROCESS_PACKET);
957 : }
958 :
959 6 : if (eattr.nonce_s == NULL || eattr.counter < 0) {
960 0 : wpa_printf(MSG_INFO, "EAP-SIM: (encr) No%s%s in reauth packet",
961 0 : !eattr.nonce_s ? " AT_NONCE_S" : "",
962 0 : eattr.counter < 0 ? " AT_COUNTER" : "");
963 0 : os_free(decrypted);
964 0 : return eap_sim_client_error(data, id,
965 : EAP_SIM_UNABLE_TO_PROCESS_PACKET);
966 : }
967 :
968 6 : if (eattr.counter < 0 || (size_t) eattr.counter <= data->counter) {
969 : struct wpabuf *res;
970 1 : wpa_printf(MSG_INFO, "EAP-SIM: (encr) Invalid counter "
971 : "(%d <= %d)", eattr.counter, data->counter);
972 1 : data->counter_too_small = eattr.counter;
973 :
974 : /* Reply using Re-auth w/ AT_COUNTER_TOO_SMALL. The current
975 : * reauth_id must not be used to start a new reauthentication.
976 : * However, since it was used in the last EAP-Response-Identity
977 : * packet, it has to saved for the following fullauth to be
978 : * used in MK derivation. */
979 1 : os_free(data->last_eap_identity);
980 1 : data->last_eap_identity = data->reauth_id;
981 1 : data->last_eap_identity_len = data->reauth_id_len;
982 1 : data->reauth_id = NULL;
983 1 : data->reauth_id_len = 0;
984 :
985 1 : res = eap_sim_response_reauth(data, id, 1, eattr.nonce_s);
986 1 : os_free(decrypted);
987 :
988 1 : return res;
989 : }
990 5 : data->counter = eattr.counter;
991 :
992 5 : os_memcpy(data->nonce_s, eattr.nonce_s, EAP_SIM_NONCE_S_LEN);
993 5 : wpa_hexdump(MSG_DEBUG, "EAP-SIM: (encr) AT_NONCE_S",
994 5 : data->nonce_s, EAP_SIM_NONCE_S_LEN);
995 :
996 10 : eap_sim_derive_keys_reauth(data->counter,
997 5 : data->reauth_id, data->reauth_id_len,
998 5 : data->nonce_s, data->mk, data->msk,
999 5 : data->emsk);
1000 5 : eap_sim_clear_identities(sm, data, CLEAR_REAUTH_ID | CLEAR_EAP_ID);
1001 5 : eap_sim_learn_ids(sm, data, &eattr);
1002 :
1003 5 : if (data->result_ind && attr->result_ind)
1004 1 : data->use_result_ind = 1;
1005 :
1006 5 : if (data->state != FAILURE) {
1007 5 : eap_sim_state(data, data->use_result_ind ?
1008 : RESULT_SUCCESS : SUCCESS);
1009 : }
1010 :
1011 5 : data->num_id_req = 0;
1012 5 : data->num_notification = 0;
1013 5 : if (data->counter > EAP_SIM_MAX_FAST_REAUTHS) {
1014 1 : wpa_printf(MSG_DEBUG, "EAP-SIM: Maximum number of "
1015 : "fast reauths performed - force fullauth");
1016 1 : eap_sim_clear_identities(sm, data,
1017 : CLEAR_REAUTH_ID | CLEAR_EAP_ID);
1018 : }
1019 5 : os_free(decrypted);
1020 5 : return eap_sim_response_reauth(data, id, 0, data->nonce_s);
1021 : }
1022 :
1023 :
1024 156 : static struct wpabuf * eap_sim_process(struct eap_sm *sm, void *priv,
1025 : struct eap_method_ret *ret,
1026 : const struct wpabuf *reqData)
1027 : {
1028 156 : struct eap_sim_data *data = priv;
1029 : const struct eap_hdr *req;
1030 : u8 subtype, id;
1031 : struct wpabuf *res;
1032 : const u8 *pos;
1033 : struct eap_sim_attrs attr;
1034 : size_t len;
1035 :
1036 156 : wpa_hexdump_buf(MSG_DEBUG, "EAP-SIM: EAP data", reqData);
1037 156 : if (eap_get_config_identity(sm, &len) == NULL) {
1038 0 : wpa_printf(MSG_INFO, "EAP-SIM: Identity not configured");
1039 0 : eap_sm_request_identity(sm);
1040 0 : ret->ignore = TRUE;
1041 0 : return NULL;
1042 : }
1043 :
1044 156 : pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_SIM, reqData, &len);
1045 156 : if (pos == NULL || len < 3) {
1046 1 : ret->ignore = TRUE;
1047 1 : return NULL;
1048 : }
1049 155 : req = wpabuf_head(reqData);
1050 155 : id = req->identifier;
1051 155 : len = be_to_host16(req->length);
1052 :
1053 155 : ret->ignore = FALSE;
1054 155 : ret->methodState = METHOD_MAY_CONT;
1055 155 : ret->decision = DECISION_FAIL;
1056 155 : ret->allowNotifications = TRUE;
1057 :
1058 155 : subtype = *pos++;
1059 155 : wpa_printf(MSG_DEBUG, "EAP-SIM: Subtype=%d", subtype);
1060 155 : pos += 2; /* Reserved */
1061 :
1062 155 : if (eap_sim_parse_attr(pos, wpabuf_head_u8(reqData) + len, &attr, 0,
1063 : 0)) {
1064 5 : res = eap_sim_client_error(data, id,
1065 : EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1066 5 : goto done;
1067 : }
1068 :
1069 150 : switch (subtype) {
1070 : case EAP_SIM_SUBTYPE_START:
1071 69 : res = eap_sim_process_start(sm, data, id, &attr);
1072 69 : break;
1073 : case EAP_SIM_SUBTYPE_CHALLENGE:
1074 61 : res = eap_sim_process_challenge(sm, data, id, reqData, &attr);
1075 61 : break;
1076 : case EAP_SIM_SUBTYPE_NOTIFICATION:
1077 10 : res = eap_sim_process_notification(sm, data, id, reqData,
1078 : &attr);
1079 10 : break;
1080 : case EAP_SIM_SUBTYPE_REAUTHENTICATION:
1081 8 : res = eap_sim_process_reauthentication(sm, data, id, reqData,
1082 : &attr);
1083 8 : break;
1084 : case EAP_SIM_SUBTYPE_CLIENT_ERROR:
1085 1 : wpa_printf(MSG_DEBUG, "EAP-SIM: subtype Client-Error");
1086 1 : res = eap_sim_client_error(data, id,
1087 : EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1088 1 : break;
1089 : default:
1090 1 : wpa_printf(MSG_DEBUG, "EAP-SIM: Unknown subtype=%d", subtype);
1091 1 : res = eap_sim_client_error(data, id,
1092 : EAP_SIM_UNABLE_TO_PROCESS_PACKET);
1093 1 : break;
1094 : }
1095 :
1096 : done:
1097 155 : if (data->state == FAILURE) {
1098 51 : ret->decision = DECISION_FAIL;
1099 51 : ret->methodState = METHOD_DONE;
1100 104 : } else if (data->state == SUCCESS) {
1101 25 : ret->decision = data->use_result_ind ?
1102 : DECISION_UNCOND_SUCC : DECISION_COND_SUCC;
1103 25 : ret->methodState = data->use_result_ind ?
1104 : METHOD_DONE : METHOD_MAY_CONT;
1105 79 : } else if (data->state == RESULT_SUCCESS)
1106 2 : ret->methodState = METHOD_CONT;
1107 :
1108 155 : if (ret->methodState == METHOD_DONE) {
1109 53 : ret->allowNotifications = FALSE;
1110 : }
1111 :
1112 155 : return res;
1113 : }
1114 :
1115 :
1116 26 : static Boolean eap_sim_has_reauth_data(struct eap_sm *sm, void *priv)
1117 : {
1118 26 : struct eap_sim_data *data = priv;
1119 26 : return data->pseudonym || data->reauth_id;
1120 : }
1121 :
1122 :
1123 11 : static void eap_sim_deinit_for_reauth(struct eap_sm *sm, void *priv)
1124 : {
1125 11 : struct eap_sim_data *data = priv;
1126 11 : eap_sim_clear_identities(sm, data, CLEAR_EAP_ID);
1127 11 : data->use_result_ind = 0;
1128 11 : eap_sim_clear_keys(data, 1);
1129 11 : }
1130 :
1131 :
1132 9 : static void * eap_sim_init_for_reauth(struct eap_sm *sm, void *priv)
1133 : {
1134 9 : struct eap_sim_data *data = priv;
1135 9 : if (random_get_bytes(data->nonce_mt, EAP_SIM_NONCE_MT_LEN)) {
1136 0 : wpa_printf(MSG_WARNING, "EAP-SIM: Failed to get random data "
1137 : "for NONCE_MT");
1138 0 : os_free(data);
1139 0 : return NULL;
1140 : }
1141 9 : data->num_id_req = 0;
1142 9 : data->num_notification = 0;
1143 9 : eap_sim_state(data, CONTINUE);
1144 9 : return priv;
1145 : }
1146 :
1147 :
1148 9 : static const u8 * eap_sim_get_identity(struct eap_sm *sm, void *priv,
1149 : size_t *len)
1150 : {
1151 9 : struct eap_sim_data *data = priv;
1152 :
1153 9 : if (data->reauth_id) {
1154 9 : *len = data->reauth_id_len;
1155 9 : return data->reauth_id;
1156 : }
1157 :
1158 0 : if (data->pseudonym) {
1159 0 : *len = data->pseudonym_len;
1160 0 : return data->pseudonym;
1161 : }
1162 :
1163 0 : return NULL;
1164 : }
1165 :
1166 :
1167 155 : static Boolean eap_sim_isKeyAvailable(struct eap_sm *sm, void *priv)
1168 : {
1169 155 : struct eap_sim_data *data = priv;
1170 155 : return data->state == SUCCESS;
1171 : }
1172 :
1173 :
1174 25 : static u8 * eap_sim_getKey(struct eap_sm *sm, void *priv, size_t *len)
1175 : {
1176 25 : struct eap_sim_data *data = priv;
1177 : u8 *key;
1178 :
1179 25 : if (data->state != SUCCESS)
1180 0 : return NULL;
1181 :
1182 25 : key = os_malloc(EAP_SIM_KEYING_DATA_LEN);
1183 25 : if (key == NULL)
1184 0 : return NULL;
1185 :
1186 25 : *len = EAP_SIM_KEYING_DATA_LEN;
1187 25 : os_memcpy(key, data->msk, EAP_SIM_KEYING_DATA_LEN);
1188 :
1189 25 : return key;
1190 : }
1191 :
1192 :
1193 25 : static u8 * eap_sim_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1194 : {
1195 25 : struct eap_sim_data *data = priv;
1196 : u8 *id;
1197 :
1198 25 : if (data->state != SUCCESS)
1199 0 : return NULL;
1200 :
1201 25 : *len = 1 + data->num_chal * GSM_RAND_LEN + EAP_SIM_NONCE_MT_LEN;
1202 25 : id = os_malloc(*len);
1203 25 : if (id == NULL)
1204 0 : return NULL;
1205 :
1206 25 : id[0] = EAP_TYPE_SIM;
1207 25 : os_memcpy(id + 1, data->rand, data->num_chal * GSM_RAND_LEN);
1208 25 : os_memcpy(id + 1 + data->num_chal * GSM_RAND_LEN, data->nonce_mt,
1209 : EAP_SIM_NONCE_MT_LEN);
1210 25 : wpa_hexdump(MSG_DEBUG, "EAP-SIM: Derived Session-Id", id, *len);
1211 :
1212 25 : return id;
1213 : }
1214 :
1215 :
1216 1 : static u8 * eap_sim_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1217 : {
1218 1 : struct eap_sim_data *data = priv;
1219 : u8 *key;
1220 :
1221 1 : if (data->state != SUCCESS)
1222 0 : return NULL;
1223 :
1224 1 : key = os_malloc(EAP_EMSK_LEN);
1225 1 : if (key == NULL)
1226 0 : return NULL;
1227 :
1228 1 : *len = EAP_EMSK_LEN;
1229 1 : os_memcpy(key, data->emsk, EAP_EMSK_LEN);
1230 :
1231 1 : return key;
1232 : }
1233 :
1234 :
1235 49 : int eap_peer_sim_register(void)
1236 : {
1237 : struct eap_method *eap;
1238 : int ret;
1239 :
1240 49 : eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
1241 : EAP_VENDOR_IETF, EAP_TYPE_SIM, "SIM");
1242 49 : if (eap == NULL)
1243 0 : return -1;
1244 :
1245 49 : eap->init = eap_sim_init;
1246 49 : eap->deinit = eap_sim_deinit;
1247 49 : eap->process = eap_sim_process;
1248 49 : eap->isKeyAvailable = eap_sim_isKeyAvailable;
1249 49 : eap->getKey = eap_sim_getKey;
1250 49 : eap->getSessionId = eap_sim_get_session_id;
1251 49 : eap->has_reauth_data = eap_sim_has_reauth_data;
1252 49 : eap->deinit_for_reauth = eap_sim_deinit_for_reauth;
1253 49 : eap->init_for_reauth = eap_sim_init_for_reauth;
1254 49 : eap->get_identity = eap_sim_get_identity;
1255 49 : eap->get_emsk = eap_sim_get_emsk;
1256 :
1257 49 : ret = eap_peer_method_register(eap);
1258 49 : if (ret)
1259 0 : eap_peer_method_free(eap);
1260 49 : return ret;
1261 : }
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