Line data Source code
1 : /*
2 : * EAP peer method: EAP-EKE (RFC 6124)
3 : * Copyright (c) 2013, 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 "crypto/random.h"
13 : #include "eap_peer/eap_i.h"
14 : #include "eap_common/eap_eke_common.h"
15 :
16 : struct eap_eke_data {
17 : enum {
18 : IDENTITY, COMMIT, CONFIRM, SUCCESS, FAILURE
19 : } state;
20 : u8 msk[EAP_MSK_LEN];
21 : u8 emsk[EAP_EMSK_LEN];
22 : u8 *peerid;
23 : size_t peerid_len;
24 : u8 *serverid;
25 : size_t serverid_len;
26 : u8 dh_priv[EAP_EKE_MAX_DH_LEN];
27 : struct eap_eke_session sess;
28 : u8 nonce_p[EAP_EKE_MAX_NONCE_LEN];
29 : u8 nonce_s[EAP_EKE_MAX_NONCE_LEN];
30 : struct wpabuf *msgs;
31 : u8 dhgroup; /* forced DH group or 0 to allow all supported */
32 : u8 encr; /* forced encryption algorithm or 0 to allow all supported */
33 : u8 prf; /* forced PRF or 0 to allow all supported */
34 : u8 mac; /* forced MAC or 0 to allow all supported */
35 : };
36 :
37 :
38 3200 : static const char * eap_eke_state_txt(int state)
39 : {
40 3200 : switch (state) {
41 : case IDENTITY:
42 1254 : return "IDENTITY";
43 : case COMMIT:
44 805 : return "COMMIT";
45 : case CONFIRM:
46 715 : return "CONFIRM";
47 : case SUCCESS:
48 334 : return "SUCCESS";
49 : case FAILURE:
50 92 : return "FAILURE";
51 : default:
52 0 : return "?";
53 : }
54 : }
55 :
56 :
57 1600 : static void eap_eke_state(struct eap_eke_data *data, int state)
58 : {
59 3200 : wpa_printf(MSG_DEBUG, "EAP-EKE: %s -> %s",
60 1600 : eap_eke_state_txt(data->state), eap_eke_state_txt(state));
61 1600 : data->state = state;
62 1600 : }
63 :
64 :
65 : static void eap_eke_deinit(struct eap_sm *sm, void *priv);
66 :
67 :
68 420 : static void * eap_eke_init(struct eap_sm *sm)
69 : {
70 : struct eap_eke_data *data;
71 : const u8 *identity, *password;
72 : size_t identity_len, password_len;
73 : const char *phase1;
74 :
75 420 : password = eap_get_config_password(sm, &password_len);
76 420 : if (!password) {
77 0 : wpa_printf(MSG_INFO, "EAP-EKE: No password configured");
78 0 : return NULL;
79 : }
80 :
81 420 : data = os_zalloc(sizeof(*data));
82 420 : if (data == NULL)
83 1 : return NULL;
84 419 : eap_eke_state(data, IDENTITY);
85 :
86 419 : identity = eap_get_config_identity(sm, &identity_len);
87 419 : if (identity) {
88 419 : data->peerid = os_malloc(identity_len);
89 419 : if (data->peerid == NULL) {
90 1 : eap_eke_deinit(sm, data);
91 1 : return NULL;
92 : }
93 418 : os_memcpy(data->peerid, identity, identity_len);
94 418 : data->peerid_len = identity_len;
95 : }
96 :
97 418 : phase1 = eap_get_config_phase1(sm);
98 418 : if (phase1) {
99 : const char *pos;
100 :
101 307 : pos = os_strstr(phase1, "dhgroup=");
102 307 : if (pos) {
103 307 : data->dhgroup = atoi(pos + 8);
104 307 : wpa_printf(MSG_DEBUG, "EAP-EKE: Forced dhgroup %u",
105 307 : data->dhgroup);
106 : }
107 :
108 307 : pos = os_strstr(phase1, "encr=");
109 307 : if (pos) {
110 307 : data->encr = atoi(pos + 5);
111 307 : wpa_printf(MSG_DEBUG, "EAP-EKE: Forced encr %u",
112 307 : data->encr);
113 : }
114 :
115 307 : pos = os_strstr(phase1, "prf=");
116 307 : if (pos) {
117 307 : data->prf = atoi(pos + 4);
118 307 : wpa_printf(MSG_DEBUG, "EAP-EKE: Forced prf %u",
119 307 : data->prf);
120 : }
121 :
122 307 : pos = os_strstr(phase1, "mac=");
123 307 : if (pos) {
124 307 : data->mac = atoi(pos + 4);
125 307 : wpa_printf(MSG_DEBUG, "EAP-EKE: Forced mac %u",
126 307 : data->mac);
127 : }
128 : }
129 :
130 418 : return data;
131 : }
132 :
133 :
134 419 : static void eap_eke_deinit(struct eap_sm *sm, void *priv)
135 : {
136 419 : struct eap_eke_data *data = priv;
137 419 : eap_eke_session_clean(&data->sess);
138 419 : os_free(data->serverid);
139 419 : os_free(data->peerid);
140 419 : wpabuf_free(data->msgs);
141 419 : bin_clear_free(data, sizeof(*data));
142 419 : }
143 :
144 :
145 1199 : static struct wpabuf * eap_eke_build_msg(struct eap_eke_data *data, int id,
146 : size_t length, u8 eke_exch)
147 : {
148 : struct wpabuf *msg;
149 : size_t plen;
150 :
151 1199 : plen = 1 + length;
152 :
153 1199 : msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_EKE, plen,
154 : EAP_CODE_RESPONSE, id);
155 1199 : if (msg == NULL) {
156 5 : wpa_printf(MSG_ERROR, "EAP-EKE: Failed to allocate memory");
157 5 : return NULL;
158 : }
159 :
160 1194 : wpabuf_put_u8(msg, eke_exch);
161 :
162 1194 : return msg;
163 : }
164 :
165 :
166 719 : static int eap_eke_supp_dhgroup(u8 dhgroup)
167 : {
168 1436 : return dhgroup == EAP_EKE_DHGROUP_EKE_2 ||
169 717 : dhgroup == EAP_EKE_DHGROUP_EKE_5 ||
170 102 : dhgroup == EAP_EKE_DHGROUP_EKE_14 ||
171 820 : dhgroup == EAP_EKE_DHGROUP_EKE_15 ||
172 : dhgroup == EAP_EKE_DHGROUP_EKE_16;
173 : }
174 :
175 :
176 717 : static int eap_eke_supp_encr(u8 encr)
177 : {
178 717 : return encr == EAP_EKE_ENCR_AES128_CBC;
179 : }
180 :
181 :
182 413 : static int eap_eke_supp_prf(u8 prf)
183 : {
184 413 : return prf == EAP_EKE_PRF_HMAC_SHA1 ||
185 : prf == EAP_EKE_PRF_HMAC_SHA2_256;
186 : }
187 :
188 :
189 411 : static int eap_eke_supp_mac(u8 mac)
190 : {
191 411 : return mac == EAP_EKE_MAC_HMAC_SHA1 ||
192 : mac == EAP_EKE_MAC_HMAC_SHA2_256;
193 : }
194 :
195 :
196 92 : static struct wpabuf * eap_eke_build_fail(struct eap_eke_data *data,
197 : struct eap_method_ret *ret,
198 : u8 id, u32 failure_code)
199 : {
200 : struct wpabuf *resp;
201 :
202 92 : wpa_printf(MSG_DEBUG, "EAP-EKE: Sending EAP-EKE-Failure/Response - code=0x%x",
203 : failure_code);
204 :
205 92 : resp = eap_eke_build_msg(data, id, 4, EAP_EKE_FAILURE);
206 92 : if (resp)
207 92 : wpabuf_put_be32(resp, failure_code);
208 :
209 92 : os_memset(data->dh_priv, 0, sizeof(data->dh_priv));
210 92 : eap_eke_session_clean(&data->sess);
211 :
212 92 : eap_eke_state(data, FAILURE);
213 92 : ret->methodState = METHOD_DONE;
214 92 : ret->decision = DECISION_FAIL;
215 92 : ret->allowNotifications = FALSE;
216 :
217 92 : return resp;
218 : }
219 :
220 :
221 415 : static struct wpabuf * eap_eke_process_id(struct eap_eke_data *data,
222 : struct eap_method_ret *ret,
223 : const struct wpabuf *reqData,
224 : const u8 *payload,
225 : size_t payload_len)
226 : {
227 : struct wpabuf *resp;
228 : unsigned num_prop, i;
229 : const u8 *pos, *end;
230 415 : const u8 *prop = NULL;
231 : u8 idtype;
232 415 : u8 id = eap_get_id(reqData);
233 :
234 415 : if (data->state != IDENTITY) {
235 1 : return eap_eke_build_fail(data, ret, id,
236 : EAP_EKE_FAIL_PROTO_ERROR);
237 : }
238 :
239 414 : wpa_printf(MSG_DEBUG, "EAP-EKE: Received EAP-EKE-ID/Request");
240 :
241 414 : if (payload_len < 2 + 4) {
242 2 : wpa_printf(MSG_DEBUG, "EAP-EKE: Too short ID/Request Data");
243 2 : return eap_eke_build_fail(data, ret, id,
244 : EAP_EKE_FAIL_PROTO_ERROR);
245 : }
246 :
247 412 : pos = payload;
248 412 : end = payload + payload_len;
249 :
250 412 : num_prop = *pos++;
251 412 : pos++; /* Ignore Reserved field */
252 :
253 412 : if (pos + num_prop * 4 > end) {
254 1 : wpa_printf(MSG_DEBUG, "EAP-EKE: Too short ID/Request Data (num_prop=%u)",
255 : num_prop);
256 1 : return eap_eke_build_fail(data, ret, id,
257 : EAP_EKE_FAIL_PROTO_ERROR);
258 : }
259 :
260 1332 : for (i = 0; i < num_prop; i++) {
261 1330 : const u8 *tmp = pos;
262 :
263 5320 : wpa_printf(MSG_DEBUG, "EAP-EKE: Proposal #%u: dh=%u encr=%u prf=%u mac=%u",
264 5320 : i, pos[0], pos[1], pos[2], pos[3]);
265 1330 : pos += 4;
266 :
267 2049 : if ((data->dhgroup && data->dhgroup != *tmp) ||
268 719 : !eap_eke_supp_dhgroup(*tmp))
269 613 : continue;
270 717 : tmp++;
271 1434 : if ((data->encr && data->encr != *tmp) ||
272 717 : !eap_eke_supp_encr(*tmp))
273 2 : continue;
274 715 : tmp++;
275 1128 : if ((data->prf && data->prf != *tmp) ||
276 413 : !eap_eke_supp_prf(*tmp))
277 304 : continue;
278 411 : tmp++;
279 822 : if ((data->mac && data->mac != *tmp) ||
280 411 : !eap_eke_supp_mac(*tmp))
281 2 : continue;
282 :
283 409 : prop = tmp - 3;
284 409 : if (eap_eke_session_init(&data->sess, prop[0], prop[1], prop[2],
285 409 : prop[3]) < 0) {
286 0 : prop = NULL;
287 0 : continue;
288 : }
289 :
290 409 : wpa_printf(MSG_DEBUG, "EAP-EKE: Selected proposal");
291 409 : break;
292 : }
293 :
294 411 : if (prop == NULL) {
295 2 : wpa_printf(MSG_DEBUG, "EAP-EKE: No acceptable proposal found");
296 2 : return eap_eke_build_fail(data, ret, id,
297 : EAP_EKE_FAIL_NO_PROPOSAL_CHOSEN);
298 : }
299 :
300 409 : pos += (num_prop - i - 1) * 4;
301 :
302 409 : if (pos == end) {
303 1 : wpa_printf(MSG_DEBUG, "EAP-EKE: Too short ID/Request Data to include IDType/Identity");
304 1 : return eap_eke_build_fail(data, ret, id,
305 : EAP_EKE_FAIL_PROTO_ERROR);
306 : }
307 :
308 408 : idtype = *pos++;
309 408 : wpa_printf(MSG_DEBUG, "EAP-EKE: Server IDType %u", idtype);
310 408 : wpa_hexdump_ascii(MSG_DEBUG, "EAP-EKE: Server Identity",
311 408 : pos, end - pos);
312 408 : os_free(data->serverid);
313 408 : data->serverid = os_malloc(end - pos);
314 408 : if (data->serverid == NULL) {
315 1 : return eap_eke_build_fail(data, ret, id,
316 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
317 : }
318 407 : os_memcpy(data->serverid, pos, end - pos);
319 407 : data->serverid_len = end - pos;
320 :
321 407 : wpa_printf(MSG_DEBUG, "EAP-EKE: Sending EAP-EKE-ID/Response");
322 :
323 407 : resp = eap_eke_build_msg(data, id,
324 407 : 2 + 4 + 1 + data->peerid_len,
325 : EAP_EKE_ID);
326 407 : if (resp == NULL) {
327 3 : return eap_eke_build_fail(data, ret, id,
328 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
329 : }
330 :
331 404 : wpabuf_put_u8(resp, 1); /* NumProposals */
332 404 : wpabuf_put_u8(resp, 0); /* Reserved */
333 404 : wpabuf_put_data(resp, prop, 4); /* Selected Proposal */
334 404 : wpabuf_put_u8(resp, EAP_EKE_ID_NAI);
335 404 : if (data->peerid)
336 404 : wpabuf_put_data(resp, data->peerid, data->peerid_len);
337 :
338 404 : wpabuf_free(data->msgs);
339 404 : data->msgs = wpabuf_alloc(wpabuf_len(reqData) + wpabuf_len(resp));
340 404 : if (data->msgs == NULL) {
341 1 : wpabuf_free(resp);
342 1 : return eap_eke_build_fail(data, ret, id,
343 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
344 : }
345 403 : wpabuf_put_buf(data->msgs, reqData);
346 403 : wpabuf_put_buf(data->msgs, resp);
347 :
348 403 : eap_eke_state(data, COMMIT);
349 :
350 403 : return resp;
351 : }
352 :
353 :
354 384 : static struct wpabuf * eap_eke_process_commit(struct eap_sm *sm,
355 : struct eap_eke_data *data,
356 : struct eap_method_ret *ret,
357 : const struct wpabuf *reqData,
358 : const u8 *payload,
359 : size_t payload_len)
360 : {
361 : struct wpabuf *resp;
362 : const u8 *pos, *end, *dhcomp;
363 : size_t prot_len;
364 : u8 *rpos;
365 : u8 key[EAP_EKE_MAX_KEY_LEN];
366 : u8 pub[EAP_EKE_MAX_DH_LEN];
367 : const u8 *password;
368 : size_t password_len;
369 384 : u8 id = eap_get_id(reqData);
370 :
371 384 : if (data->state != COMMIT) {
372 1 : wpa_printf(MSG_DEBUG, "EAP-EKE: EAP-EKE-Commit/Request received in unexpected state (%d)", data->state);
373 1 : return eap_eke_build_fail(data, ret, id,
374 : EAP_EKE_FAIL_PROTO_ERROR);
375 : }
376 :
377 383 : wpa_printf(MSG_DEBUG, "EAP-EKE: Received EAP-EKE-Commit/Request");
378 :
379 383 : password = eap_get_config_password(sm, &password_len);
380 383 : if (password == NULL) {
381 0 : wpa_printf(MSG_INFO, "EAP-EKE: No password configured!");
382 0 : return eap_eke_build_fail(data, ret, id,
383 : EAP_EKE_FAIL_PASSWD_NOT_FOUND);
384 : }
385 :
386 383 : pos = payload;
387 383 : end = payload + payload_len;
388 :
389 383 : if (pos + data->sess.dhcomp_len > end) {
390 1 : wpa_printf(MSG_DEBUG, "EAP-EKE: Too short EAP-EKE-Commit");
391 1 : return eap_eke_build_fail(data, ret, id,
392 : EAP_EKE_FAIL_PROTO_ERROR);
393 : }
394 :
395 382 : wpa_hexdump(MSG_DEBUG, "EAP-EKE: DHComponent_S",
396 382 : pos, data->sess.dhcomp_len);
397 382 : dhcomp = pos;
398 382 : pos += data->sess.dhcomp_len;
399 382 : wpa_hexdump(MSG_DEBUG, "EAP-EKE: CBValue", pos, end - pos);
400 :
401 : /*
402 : * temp = prf(0+, password)
403 : * key = prf+(temp, ID_S | ID_P)
404 : */
405 1146 : if (eap_eke_derive_key(&data->sess, password, password_len,
406 382 : data->serverid, data->serverid_len,
407 382 : data->peerid, data->peerid_len, key) < 0) {
408 4 : wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive key");
409 4 : return eap_eke_build_fail(data, ret, id,
410 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
411 : }
412 :
413 : /*
414 : * y_p = g ^ x_p (mod p)
415 : * x_p = random number 2 .. p-1
416 : */
417 378 : if (eap_eke_dh_init(data->sess.dhgroup, data->dh_priv, pub) < 0) {
418 3 : wpa_printf(MSG_INFO, "EAP-EKE: Failed to initialize DH");
419 3 : os_memset(key, 0, sizeof(key));
420 3 : return eap_eke_build_fail(data, ret, id,
421 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
422 : }
423 :
424 375 : if (eap_eke_shared_secret(&data->sess, key, data->dh_priv, dhcomp) < 0)
425 : {
426 3 : wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive shared secret");
427 3 : os_memset(key, 0, sizeof(key));
428 3 : return eap_eke_build_fail(data, ret, id,
429 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
430 : }
431 :
432 1116 : if (eap_eke_derive_ke_ki(&data->sess,
433 372 : data->serverid, data->serverid_len,
434 372 : data->peerid, data->peerid_len) < 0) {
435 3 : wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive Ke/Ki");
436 3 : os_memset(key, 0, sizeof(key));
437 3 : return eap_eke_build_fail(data, ret, id,
438 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
439 : }
440 :
441 369 : wpa_printf(MSG_DEBUG, "EAP-EKE: Sending EAP-EKE-Commit/Response");
442 :
443 369 : resp = eap_eke_build_msg(data, id,
444 369 : data->sess.dhcomp_len + data->sess.pnonce_len,
445 : EAP_EKE_COMMIT);
446 369 : if (resp == NULL) {
447 1 : os_memset(key, 0, sizeof(key));
448 1 : return eap_eke_build_fail(data, ret, id,
449 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
450 : }
451 :
452 : /* DHComponent_P = Encr(key, y_p) */
453 368 : rpos = wpabuf_put(resp, data->sess.dhcomp_len);
454 368 : if (eap_eke_dhcomp(&data->sess, key, pub, rpos) < 0) {
455 3 : wpabuf_free(resp);
456 3 : wpa_printf(MSG_INFO, "EAP-EKE: Failed to build DHComponent_P");
457 3 : os_memset(key, 0, sizeof(key));
458 3 : return eap_eke_build_fail(data, ret, id,
459 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
460 : }
461 365 : os_memset(key, 0, sizeof(key));
462 :
463 365 : wpa_hexdump(MSG_DEBUG, "EAP-EKE: DHComponent_P",
464 365 : rpos, data->sess.dhcomp_len);
465 :
466 365 : if (random_get_bytes(data->nonce_p, data->sess.nonce_len)) {
467 1 : wpabuf_free(resp);
468 1 : return eap_eke_build_fail(data, ret, id,
469 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
470 : }
471 728 : wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Nonce_P",
472 728 : data->nonce_p, data->sess.nonce_len);
473 364 : prot_len = wpabuf_tailroom(resp);
474 364 : if (eap_eke_prot(&data->sess, data->nonce_p, data->sess.nonce_len,
475 364 : wpabuf_put(resp, 0), &prot_len) < 0) {
476 2 : wpabuf_free(resp);
477 2 : return eap_eke_build_fail(data, ret, id,
478 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
479 : }
480 724 : wpa_hexdump(MSG_DEBUG, "EAP-EKE: PNonce_P",
481 362 : wpabuf_put(resp, 0), prot_len);
482 362 : wpabuf_put(resp, prot_len);
483 :
484 : /* TODO: CBValue */
485 :
486 362 : if (wpabuf_resize(&data->msgs, wpabuf_len(reqData) + wpabuf_len(resp))
487 : < 0) {
488 1 : wpabuf_free(resp);
489 1 : return eap_eke_build_fail(data, ret, id,
490 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
491 : }
492 361 : wpabuf_put_buf(data->msgs, reqData);
493 361 : wpabuf_put_buf(data->msgs, resp);
494 :
495 361 : eap_eke_state(data, CONFIRM);
496 :
497 361 : return resp;
498 : }
499 :
500 :
501 340 : static struct wpabuf * eap_eke_process_confirm(struct eap_eke_data *data,
502 : struct eap_method_ret *ret,
503 : const struct wpabuf *reqData,
504 : const u8 *payload,
505 : size_t payload_len)
506 : {
507 : struct wpabuf *resp;
508 : const u8 *pos, *end;
509 : size_t prot_len;
510 : u8 nonces[2 * EAP_EKE_MAX_NONCE_LEN];
511 : u8 auth_s[EAP_EKE_MAX_HASH_LEN];
512 : size_t decrypt_len;
513 : u8 *auth;
514 340 : u8 id = eap_get_id(reqData);
515 :
516 340 : if (data->state != CONFIRM) {
517 1 : wpa_printf(MSG_DEBUG, "EAP-EKE: EAP-EKE-Confirm/Request received in unexpected state (%d)",
518 1 : data->state);
519 1 : return eap_eke_build_fail(data, ret, id,
520 : EAP_EKE_FAIL_PROTO_ERROR);
521 : }
522 :
523 339 : wpa_printf(MSG_DEBUG, "EAP-EKE: Received EAP-EKE-Confirm/Request");
524 :
525 339 : pos = payload;
526 339 : end = payload + payload_len;
527 :
528 339 : if (pos + data->sess.pnonce_ps_len + data->sess.prf_len > end) {
529 1 : wpa_printf(MSG_DEBUG, "EAP-EKE: Too short EAP-EKE-Confirm");
530 1 : return eap_eke_build_fail(data, ret, id,
531 : EAP_EKE_FAIL_PROTO_ERROR);
532 : }
533 :
534 338 : decrypt_len = sizeof(nonces);
535 338 : if (eap_eke_decrypt_prot(&data->sess, pos, data->sess.pnonce_ps_len,
536 : nonces, &decrypt_len) < 0) {
537 3 : wpa_printf(MSG_INFO, "EAP-EKE: Failed to decrypt PNonce_PS");
538 3 : return eap_eke_build_fail(data, ret, id,
539 : EAP_EKE_FAIL_AUTHENTICATION_FAIL);
540 : }
541 335 : if (decrypt_len != (size_t) 2 * data->sess.nonce_len) {
542 0 : wpa_printf(MSG_INFO, "EAP-EKE: PNonce_PS protected data length does not match length of Nonce_P and Nonce_S");
543 0 : return eap_eke_build_fail(data, ret, id,
544 : EAP_EKE_FAIL_AUTHENTICATION_FAIL);
545 : }
546 335 : wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Received Nonce_P | Nonce_S",
547 335 : nonces, 2 * data->sess.nonce_len);
548 335 : if (os_memcmp(data->nonce_p, nonces, data->sess.nonce_len) != 0) {
549 0 : wpa_printf(MSG_INFO, "EAP-EKE: Received Nonce_P does not match transmitted Nonce_P");
550 0 : return eap_eke_build_fail(data, ret, id,
551 : EAP_EKE_FAIL_AUTHENTICATION_FAIL);
552 : }
553 :
554 335 : os_memcpy(data->nonce_s, nonces + data->sess.nonce_len,
555 : data->sess.nonce_len);
556 670 : wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Nonce_S",
557 670 : data->nonce_s, data->sess.nonce_len);
558 :
559 670 : if (eap_eke_derive_ka(&data->sess, data->serverid, data->serverid_len,
560 335 : data->peerid, data->peerid_len,
561 335 : data->nonce_p, data->nonce_s) < 0) {
562 3 : return eap_eke_build_fail(data, ret, id,
563 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
564 : }
565 :
566 332 : if (eap_eke_auth(&data->sess, "EAP-EKE server", data->msgs, auth_s) < 0)
567 : {
568 1 : return eap_eke_build_fail(data, ret, id,
569 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
570 : }
571 331 : wpa_hexdump(MSG_DEBUG, "EAP-EKE: Auth_S", auth_s, data->sess.prf_len);
572 331 : if (os_memcmp_const(auth_s, pos + data->sess.pnonce_ps_len,
573 331 : data->sess.prf_len) != 0) {
574 0 : wpa_printf(MSG_INFO, "EAP-EKE: Auth_S does not match");
575 0 : return eap_eke_build_fail(data, ret, id,
576 : EAP_EKE_FAIL_AUTHENTICATION_FAIL);
577 : }
578 :
579 331 : wpa_printf(MSG_DEBUG, "EAP-EKE: Sending EAP-EKE-Confirm/Response");
580 :
581 331 : resp = eap_eke_build_msg(data, id,
582 331 : data->sess.pnonce_len + data->sess.prf_len,
583 : EAP_EKE_CONFIRM);
584 331 : if (resp == NULL) {
585 1 : return eap_eke_build_fail(data, ret, id,
586 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
587 : }
588 :
589 330 : prot_len = wpabuf_tailroom(resp);
590 330 : if (eap_eke_prot(&data->sess, data->nonce_s, data->sess.nonce_len,
591 330 : wpabuf_put(resp, 0), &prot_len) < 0) {
592 1 : wpabuf_free(resp);
593 1 : return eap_eke_build_fail(data, ret, id,
594 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
595 : }
596 329 : wpabuf_put(resp, prot_len);
597 :
598 329 : auth = wpabuf_put(resp, data->sess.prf_len);
599 329 : if (eap_eke_auth(&data->sess, "EAP-EKE peer", data->msgs, auth) < 0) {
600 1 : wpabuf_free(resp);
601 1 : return eap_eke_build_fail(data, ret, id,
602 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
603 : }
604 328 : wpa_hexdump(MSG_DEBUG, "EAP-EKE: Auth_P", auth, data->sess.prf_len);
605 :
606 656 : if (eap_eke_derive_msk(&data->sess, data->serverid, data->serverid_len,
607 328 : data->peerid, data->peerid_len,
608 328 : data->nonce_s, data->nonce_p,
609 328 : data->msk, data->emsk) < 0) {
610 3 : wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive MSK/EMSK");
611 3 : wpabuf_free(resp);
612 3 : return eap_eke_build_fail(data, ret, id,
613 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
614 : }
615 :
616 325 : os_memset(data->dh_priv, 0, sizeof(data->dh_priv));
617 325 : eap_eke_session_clean(&data->sess);
618 :
619 325 : eap_eke_state(data, SUCCESS);
620 325 : ret->methodState = METHOD_MAY_CONT;
621 325 : ret->decision = DECISION_COND_SUCC;
622 325 : ret->allowNotifications = FALSE;
623 :
624 325 : return resp;
625 : }
626 :
627 :
628 42 : static struct wpabuf * eap_eke_process_failure(struct eap_eke_data *data,
629 : struct eap_method_ret *ret,
630 : const struct wpabuf *reqData,
631 : const u8 *payload,
632 : size_t payload_len)
633 : {
634 42 : wpa_printf(MSG_DEBUG, "EAP-EKE: Received EAP-EKE-Failure/Request");
635 :
636 42 : if (payload_len < 4) {
637 1 : wpa_printf(MSG_DEBUG, "EAP-EKE: Too short EAP-EKE-Failure");
638 : } else {
639 : u32 code;
640 41 : code = WPA_GET_BE32(payload);
641 41 : wpa_printf(MSG_INFO, "EAP-EKE: Failure-Code 0x%x", code);
642 : }
643 :
644 42 : return eap_eke_build_fail(data, ret, eap_get_id(reqData),
645 : EAP_EKE_FAIL_NO_ERROR);
646 : }
647 :
648 :
649 1183 : static struct wpabuf * eap_eke_process(struct eap_sm *sm, void *priv,
650 : struct eap_method_ret *ret,
651 : const struct wpabuf *reqData)
652 : {
653 1183 : struct eap_eke_data *data = priv;
654 : struct wpabuf *resp;
655 : const u8 *pos, *end;
656 : size_t len;
657 : u8 eke_exch;
658 :
659 1183 : pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_EKE, reqData, &len);
660 1183 : if (pos == NULL || len < 1) {
661 1 : ret->ignore = TRUE;
662 1 : return NULL;
663 : }
664 :
665 1182 : end = pos + len;
666 1182 : eke_exch = *pos++;
667 :
668 1182 : wpa_printf(MSG_DEBUG, "EAP-EKE: Received frame: exch %d", eke_exch);
669 1182 : wpa_hexdump(MSG_DEBUG, "EAP-EKE: Received Data", pos, end - pos);
670 :
671 1182 : ret->ignore = FALSE;
672 1182 : ret->methodState = METHOD_MAY_CONT;
673 1182 : ret->decision = DECISION_FAIL;
674 1182 : ret->allowNotifications = TRUE;
675 :
676 1182 : switch (eke_exch) {
677 : case EAP_EKE_ID:
678 415 : resp = eap_eke_process_id(data, ret, reqData, pos, end - pos);
679 415 : break;
680 : case EAP_EKE_COMMIT:
681 384 : resp = eap_eke_process_commit(sm, data, ret, reqData,
682 384 : pos, end - pos);
683 384 : break;
684 : case EAP_EKE_CONFIRM:
685 340 : resp = eap_eke_process_confirm(data, ret, reqData,
686 340 : pos, end - pos);
687 340 : break;
688 : case EAP_EKE_FAILURE:
689 42 : resp = eap_eke_process_failure(data, ret, reqData,
690 42 : pos, end - pos);
691 42 : break;
692 : default:
693 1 : wpa_printf(MSG_DEBUG, "EAP-EKE: Ignoring message with unknown EKE-Exch %d", eke_exch);
694 1 : ret->ignore = TRUE;
695 1 : return NULL;
696 : }
697 :
698 1181 : if (ret->methodState == METHOD_DONE)
699 92 : ret->allowNotifications = FALSE;
700 :
701 1181 : return resp;
702 : }
703 :
704 :
705 1181 : static Boolean eap_eke_isKeyAvailable(struct eap_sm *sm, void *priv)
706 : {
707 1181 : struct eap_eke_data *data = priv;
708 1181 : return data->state == SUCCESS;
709 : }
710 :
711 :
712 325 : static u8 * eap_eke_getKey(struct eap_sm *sm, void *priv, size_t *len)
713 : {
714 325 : struct eap_eke_data *data = priv;
715 : u8 *key;
716 :
717 325 : if (data->state != SUCCESS)
718 0 : return NULL;
719 :
720 325 : key = os_malloc(EAP_MSK_LEN);
721 325 : if (key == NULL)
722 1 : return NULL;
723 324 : os_memcpy(key, data->msk, EAP_MSK_LEN);
724 324 : *len = EAP_MSK_LEN;
725 :
726 324 : return key;
727 : }
728 :
729 :
730 3 : static u8 * eap_eke_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
731 : {
732 3 : struct eap_eke_data *data = priv;
733 : u8 *key;
734 :
735 3 : if (data->state != SUCCESS)
736 0 : return NULL;
737 :
738 3 : key = os_malloc(EAP_EMSK_LEN);
739 3 : if (key == NULL)
740 1 : return NULL;
741 2 : os_memcpy(key, data->emsk, EAP_EMSK_LEN);
742 2 : *len = EAP_EMSK_LEN;
743 :
744 2 : return key;
745 : }
746 :
747 :
748 325 : static u8 * eap_eke_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
749 : {
750 325 : struct eap_eke_data *data = priv;
751 : u8 *sid;
752 : size_t sid_len;
753 :
754 325 : if (data->state != SUCCESS)
755 0 : return NULL;
756 :
757 325 : sid_len = 1 + 2 * data->sess.nonce_len;
758 325 : sid = os_malloc(sid_len);
759 325 : if (sid == NULL)
760 1 : return NULL;
761 324 : sid[0] = EAP_TYPE_EKE;
762 324 : os_memcpy(sid + 1, data->nonce_p, data->sess.nonce_len);
763 324 : os_memcpy(sid + 1 + data->sess.nonce_len, data->nonce_s,
764 : data->sess.nonce_len);
765 324 : *len = sid_len;
766 :
767 324 : return sid;
768 : }
769 :
770 :
771 49 : int eap_peer_eke_register(void)
772 : {
773 : struct eap_method *eap;
774 :
775 49 : eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
776 : EAP_VENDOR_IETF, EAP_TYPE_EKE, "EKE");
777 49 : if (eap == NULL)
778 0 : return -1;
779 :
780 49 : eap->init = eap_eke_init;
781 49 : eap->deinit = eap_eke_deinit;
782 49 : eap->process = eap_eke_process;
783 49 : eap->isKeyAvailable = eap_eke_isKeyAvailable;
784 49 : eap->getKey = eap_eke_getKey;
785 49 : eap->get_emsk = eap_eke_get_emsk;
786 49 : eap->getSessionId = eap_eke_get_session_id;
787 :
788 49 : return eap_peer_method_register(eap);
789 : }
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