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 :
38 404 : static const char * eap_eke_state_txt(int state)
39 : {
40 404 : switch (state) {
41 : case IDENTITY:
42 184 : return "IDENTITY";
43 : case COMMIT:
44 104 : return "COMMIT";
45 : case CONFIRM:
46 61 : return "CONFIRM";
47 : case SUCCESS:
48 16 : return "SUCCESS";
49 : case FAILURE:
50 39 : return "FAILURE";
51 : default:
52 0 : return "?";
53 : }
54 : }
55 :
56 :
57 202 : static void eap_eke_state(struct eap_eke_data *data, int state)
58 : {
59 404 : wpa_printf(MSG_DEBUG, "EAP-EKE: %s -> %s",
60 202 : eap_eke_state_txt(data->state), eap_eke_state_txt(state));
61 202 : data->state = state;
62 202 : }
63 :
64 :
65 : static void eap_eke_deinit(struct eap_sm *sm, void *priv);
66 :
67 :
68 62 : 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 62 : password = eap_get_config_password(sm, &password_len);
76 62 : if (!password) {
77 0 : wpa_printf(MSG_INFO, "EAP-EKE: No password configured");
78 0 : return NULL;
79 : }
80 :
81 62 : data = os_zalloc(sizeof(*data));
82 62 : if (data == NULL)
83 0 : return NULL;
84 62 : eap_eke_state(data, IDENTITY);
85 :
86 62 : identity = eap_get_config_identity(sm, &identity_len);
87 62 : if (identity) {
88 62 : data->peerid = os_malloc(identity_len);
89 62 : if (data->peerid == NULL) {
90 0 : eap_eke_deinit(sm, data);
91 0 : return NULL;
92 : }
93 62 : os_memcpy(data->peerid, identity, identity_len);
94 62 : data->peerid_len = identity_len;
95 : }
96 :
97 62 : phase1 = eap_get_config_phase1(sm);
98 62 : if (phase1) {
99 : const char *pos;
100 :
101 5 : pos = os_strstr(phase1, "dhgroup=");
102 5 : if (pos) {
103 5 : data->dhgroup = atoi(pos + 8);
104 5 : wpa_printf(MSG_DEBUG, "EAP-EKE: Forced dhgroup %u",
105 5 : data->dhgroup);
106 : }
107 :
108 5 : pos = os_strstr(phase1, "encr=");
109 5 : if (pos) {
110 5 : data->encr = atoi(pos + 5);
111 5 : wpa_printf(MSG_DEBUG, "EAP-EKE: Forced encr %u",
112 5 : data->encr);
113 : }
114 :
115 5 : pos = os_strstr(phase1, "prf=");
116 5 : if (pos) {
117 5 : data->prf = atoi(pos + 4);
118 5 : wpa_printf(MSG_DEBUG, "EAP-EKE: Forced prf %u",
119 5 : data->prf);
120 : }
121 :
122 5 : pos = os_strstr(phase1, "mac=");
123 5 : if (pos) {
124 5 : data->mac = atoi(pos + 4);
125 5 : wpa_printf(MSG_DEBUG, "EAP-EKE: Forced mac %u",
126 5 : data->mac);
127 : }
128 : }
129 :
130 62 : return data;
131 : }
132 :
133 :
134 62 : static void eap_eke_deinit(struct eap_sm *sm, void *priv)
135 : {
136 62 : struct eap_eke_data *data = priv;
137 62 : eap_eke_session_clean(&data->sess);
138 62 : os_free(data->serverid);
139 62 : os_free(data->peerid);
140 62 : wpabuf_free(data->msgs);
141 62 : bin_clear_free(data, sizeof(*data));
142 62 : }
143 :
144 :
145 140 : 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 :
151 140 : plen = 1 + length;
152 :
153 140 : msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_EKE, plen,
154 : EAP_CODE_RESPONSE, id);
155 140 : if (msg == NULL) {
156 0 : wpa_printf(MSG_ERROR, "EAP-EKE: Failed to allocate memory");
157 0 : return NULL;
158 : }
159 :
160 140 : wpabuf_put_u8(msg, eke_exch);
161 :
162 140 : return msg;
163 : }
164 :
165 :
166 62 : static int eap_eke_supp_dhgroup(u8 dhgroup)
167 : {
168 122 : return dhgroup == EAP_EKE_DHGROUP_EKE_2 ||
169 60 : dhgroup == EAP_EKE_DHGROUP_EKE_5 ||
170 47 : dhgroup == EAP_EKE_DHGROUP_EKE_14 ||
171 108 : dhgroup == EAP_EKE_DHGROUP_EKE_15 ||
172 : dhgroup == EAP_EKE_DHGROUP_EKE_16;
173 : }
174 :
175 :
176 60 : static int eap_eke_supp_encr(u8 encr)
177 : {
178 60 : return encr == EAP_EKE_ENCR_AES128_CBC;
179 : }
180 :
181 :
182 57 : static int eap_eke_supp_prf(u8 prf)
183 : {
184 57 : return prf == EAP_EKE_PRF_HMAC_SHA1 ||
185 : prf == EAP_EKE_PRF_HMAC_SHA2_256;
186 : }
187 :
188 :
189 55 : static int eap_eke_supp_mac(u8 mac)
190 : {
191 55 : return mac == EAP_EKE_MAC_HMAC_SHA1 ||
192 : mac == EAP_EKE_MAC_HMAC_SHA2_256;
193 : }
194 :
195 :
196 39 : 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 39 : wpa_printf(MSG_DEBUG, "EAP-EKE: Sending EAP-EKE-Failure/Response - code=0x%x",
203 : failure_code);
204 :
205 39 : resp = eap_eke_build_msg(data, id, 4, EAP_EKE_FAILURE);
206 39 : if (resp)
207 39 : wpabuf_put_be32(resp, failure_code);
208 :
209 39 : os_memset(data->dh_priv, 0, sizeof(data->dh_priv));
210 39 : eap_eke_session_clean(&data->sess);
211 :
212 39 : eap_eke_state(data, FAILURE);
213 39 : ret->methodState = METHOD_DONE;
214 39 : ret->decision = DECISION_FAIL;
215 39 : ret->allowNotifications = FALSE;
216 :
217 39 : return resp;
218 : }
219 :
220 :
221 59 : 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 59 : const u8 *prop = NULL;
231 : u8 idtype;
232 59 : u8 id = eap_get_id(reqData);
233 :
234 59 : if (data->state != IDENTITY) {
235 1 : return eap_eke_build_fail(data, ret, id,
236 : EAP_EKE_FAIL_PROTO_ERROR);
237 : }
238 :
239 58 : wpa_printf(MSG_DEBUG, "EAP-EKE: Received EAP-EKE-ID/Request");
240 :
241 58 : 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 56 : pos = payload;
248 56 : end = payload + payload_len;
249 :
250 56 : num_prop = *pos++;
251 56 : pos++; /* Ignore Reserved field */
252 :
253 56 : 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 73 : for (i = 0; i < num_prop; i++) {
261 71 : const u8 *tmp = pos;
262 :
263 284 : wpa_printf(MSG_DEBUG, "EAP-EKE: Proposal #%u: dh=%u encr=%u prf=%u mac=%u",
264 284 : i, pos[0], pos[1], pos[2], pos[3]);
265 71 : pos += 4;
266 :
267 133 : if ((data->dhgroup && data->dhgroup != *tmp) ||
268 62 : !eap_eke_supp_dhgroup(*tmp))
269 11 : continue;
270 60 : tmp++;
271 120 : if ((data->encr && data->encr != *tmp) ||
272 60 : !eap_eke_supp_encr(*tmp))
273 2 : continue;
274 58 : tmp++;
275 115 : if ((data->prf && data->prf != *tmp) ||
276 57 : !eap_eke_supp_prf(*tmp))
277 3 : continue;
278 55 : tmp++;
279 110 : if ((data->mac && data->mac != *tmp) ||
280 55 : !eap_eke_supp_mac(*tmp))
281 2 : continue;
282 :
283 53 : prop = tmp - 3;
284 53 : if (eap_eke_session_init(&data->sess, prop[0], prop[1], prop[2],
285 53 : prop[3]) < 0) {
286 0 : prop = NULL;
287 0 : continue;
288 : }
289 :
290 53 : wpa_printf(MSG_DEBUG, "EAP-EKE: Selected proposal");
291 53 : break;
292 : }
293 :
294 55 : 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 53 : pos += (num_prop - i - 1) * 4;
301 :
302 53 : 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 52 : idtype = *pos++;
309 52 : wpa_printf(MSG_DEBUG, "EAP-EKE: Server IDType %u", idtype);
310 52 : wpa_hexdump_ascii(MSG_DEBUG, "EAP-EKE: Server Identity",
311 52 : pos, end - pos);
312 52 : os_free(data->serverid);
313 52 : data->serverid = os_malloc(end - pos);
314 52 : if (data->serverid == NULL) {
315 0 : return eap_eke_build_fail(data, ret, id,
316 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
317 : }
318 52 : os_memcpy(data->serverid, pos, end - pos);
319 52 : data->serverid_len = end - pos;
320 :
321 52 : wpa_printf(MSG_DEBUG, "EAP-EKE: Sending EAP-EKE-ID/Response");
322 :
323 52 : resp = eap_eke_build_msg(data, id,
324 52 : 2 + 4 + 1 + data->peerid_len,
325 : EAP_EKE_ID);
326 52 : if (resp == NULL) {
327 0 : return eap_eke_build_fail(data, ret, id,
328 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
329 : }
330 :
331 52 : wpabuf_put_u8(resp, 1); /* NumProposals */
332 52 : wpabuf_put_u8(resp, 0); /* Reserved */
333 52 : wpabuf_put_data(resp, prop, 4); /* Selected Proposal */
334 52 : wpabuf_put_u8(resp, EAP_EKE_ID_NAI);
335 52 : if (data->peerid)
336 52 : wpabuf_put_data(resp, data->peerid, data->peerid_len);
337 :
338 52 : wpabuf_free(data->msgs);
339 52 : data->msgs = wpabuf_alloc(wpabuf_len(reqData) + wpabuf_len(resp));
340 52 : if (data->msgs == NULL) {
341 0 : wpabuf_free(resp);
342 0 : return eap_eke_build_fail(data, ret, id,
343 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
344 : }
345 52 : wpabuf_put_buf(data->msgs, reqData);
346 52 : wpabuf_put_buf(data->msgs, resp);
347 :
348 52 : eap_eke_state(data, COMMIT);
349 :
350 52 : return resp;
351 : }
352 :
353 :
354 36 : 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 36 : u8 id = eap_get_id(reqData);
370 :
371 36 : 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 35 : wpa_printf(MSG_DEBUG, "EAP-EKE: Received EAP-EKE-Commit/Request");
378 :
379 35 : password = eap_get_config_password(sm, &password_len);
380 35 : 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 35 : pos = payload;
387 35 : end = payload + payload_len;
388 :
389 35 : 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 34 : wpa_hexdump(MSG_DEBUG, "EAP-EKE: DHComponent_S",
396 34 : pos, data->sess.dhcomp_len);
397 34 : dhcomp = pos;
398 34 : pos += data->sess.dhcomp_len;
399 34 : 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 : */
405 102 : if (eap_eke_derive_key(&data->sess, password, password_len,
406 34 : data->serverid, data->serverid_len,
407 34 : data->peerid, data->peerid_len, key) < 0) {
408 0 : wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive key");
409 0 : 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 34 : if (eap_eke_dh_init(data->sess.dhgroup, data->dh_priv, pub) < 0) {
418 0 : wpa_printf(MSG_INFO, "EAP-EKE: Failed to initialize DH");
419 0 : os_memset(key, 0, sizeof(key));
420 0 : return eap_eke_build_fail(data, ret, id,
421 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
422 : }
423 :
424 34 : if (eap_eke_shared_secret(&data->sess, key, data->dh_priv, dhcomp) < 0)
425 : {
426 0 : wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive shared secret");
427 0 : os_memset(key, 0, sizeof(key));
428 0 : return eap_eke_build_fail(data, ret, id,
429 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
430 : }
431 :
432 102 : if (eap_eke_derive_ke_ki(&data->sess,
433 34 : data->serverid, data->serverid_len,
434 34 : data->peerid, data->peerid_len) < 0) {
435 0 : wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive Ke/Ki");
436 0 : os_memset(key, 0, sizeof(key));
437 0 : return eap_eke_build_fail(data, ret, id,
438 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
439 : }
440 :
441 34 : wpa_printf(MSG_DEBUG, "EAP-EKE: Sending EAP-EKE-Commit/Response");
442 :
443 34 : resp = eap_eke_build_msg(data, id,
444 34 : data->sess.dhcomp_len + data->sess.pnonce_len,
445 : EAP_EKE_COMMIT);
446 34 : if (resp == NULL) {
447 0 : os_memset(key, 0, sizeof(key));
448 0 : 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 34 : rpos = wpabuf_put(resp, data->sess.dhcomp_len);
454 34 : if (eap_eke_dhcomp(&data->sess, key, pub, rpos) < 0) {
455 0 : wpa_printf(MSG_INFO, "EAP-EKE: Failed to build DHComponent_P");
456 0 : os_memset(key, 0, sizeof(key));
457 0 : return eap_eke_build_fail(data, ret, id,
458 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
459 : }
460 34 : os_memset(key, 0, sizeof(key));
461 :
462 34 : wpa_hexdump(MSG_DEBUG, "EAP-EKE: DHComponent_P",
463 34 : rpos, data->sess.dhcomp_len);
464 :
465 34 : if (random_get_bytes(data->nonce_p, data->sess.nonce_len)) {
466 0 : wpabuf_free(resp);
467 0 : return eap_eke_build_fail(data, ret, id,
468 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
469 : }
470 68 : wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Nonce_P",
471 68 : data->nonce_p, data->sess.nonce_len);
472 34 : prot_len = wpabuf_tailroom(resp);
473 34 : if (eap_eke_prot(&data->sess, data->nonce_p, data->sess.nonce_len,
474 34 : wpabuf_put(resp, 0), &prot_len) < 0) {
475 0 : wpabuf_free(resp);
476 0 : return eap_eke_build_fail(data, ret, id,
477 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
478 : }
479 68 : wpa_hexdump(MSG_DEBUG, "EAP-EKE: PNonce_P",
480 34 : wpabuf_put(resp, 0), prot_len);
481 34 : wpabuf_put(resp, prot_len);
482 :
483 : /* TODO: CBValue */
484 :
485 34 : if (wpabuf_resize(&data->msgs, wpabuf_len(reqData) + wpabuf_len(resp))
486 : < 0) {
487 0 : wpabuf_free(resp);
488 0 : return eap_eke_build_fail(data, ret, id,
489 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
490 : }
491 34 : wpabuf_put_buf(data->msgs, reqData);
492 34 : wpabuf_put_buf(data->msgs, resp);
493 :
494 34 : eap_eke_state(data, CONFIRM);
495 :
496 34 : return resp;
497 : }
498 :
499 :
500 18 : static struct wpabuf * eap_eke_process_confirm(struct eap_eke_data *data,
501 : struct eap_method_ret *ret,
502 : const struct wpabuf *reqData,
503 : const u8 *payload,
504 : size_t payload_len)
505 : {
506 : struct wpabuf *resp;
507 : const u8 *pos, *end;
508 : size_t prot_len;
509 : u8 nonces[2 * EAP_EKE_MAX_NONCE_LEN];
510 : u8 auth_s[EAP_EKE_MAX_HASH_LEN];
511 : size_t decrypt_len;
512 : u8 *auth;
513 18 : u8 id = eap_get_id(reqData);
514 :
515 18 : if (data->state != CONFIRM) {
516 1 : wpa_printf(MSG_DEBUG, "EAP-EKE: EAP-EKE-Confirm/Request received in unexpected state (%d)",
517 1 : data->state);
518 1 : return eap_eke_build_fail(data, ret, id,
519 : EAP_EKE_FAIL_PROTO_ERROR);
520 : }
521 :
522 17 : wpa_printf(MSG_DEBUG, "EAP-EKE: Received EAP-EKE-Confirm/Request");
523 :
524 17 : pos = payload;
525 17 : end = payload + payload_len;
526 :
527 17 : if (pos + data->sess.pnonce_ps_len + data->sess.prf_len > end) {
528 1 : wpa_printf(MSG_DEBUG, "EAP-EKE: Too short EAP-EKE-Confirm");
529 1 : return eap_eke_build_fail(data, ret, id,
530 : EAP_EKE_FAIL_PROTO_ERROR);
531 : }
532 :
533 16 : decrypt_len = sizeof(nonces);
534 16 : if (eap_eke_decrypt_prot(&data->sess, pos, data->sess.pnonce_ps_len,
535 : nonces, &decrypt_len) < 0) {
536 1 : wpa_printf(MSG_INFO, "EAP-EKE: Failed to decrypt PNonce_PS");
537 1 : return eap_eke_build_fail(data, ret, id,
538 : EAP_EKE_FAIL_AUTHENTICATION_FAIL);
539 : }
540 15 : if (decrypt_len != (size_t) 2 * data->sess.nonce_len) {
541 0 : wpa_printf(MSG_INFO, "EAP-EKE: PNonce_PS protected data length does not match length of Nonce_P and Nonce_S");
542 0 : return eap_eke_build_fail(data, ret, id,
543 : EAP_EKE_FAIL_AUTHENTICATION_FAIL);
544 : }
545 15 : wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Received Nonce_P | Nonce_S",
546 15 : nonces, 2 * data->sess.nonce_len);
547 15 : if (os_memcmp(data->nonce_p, nonces, data->sess.nonce_len) != 0) {
548 0 : wpa_printf(MSG_INFO, "EAP-EKE: Received Nonce_P does not match transmitted Nonce_P");
549 0 : return eap_eke_build_fail(data, ret, id,
550 : EAP_EKE_FAIL_AUTHENTICATION_FAIL);
551 : }
552 :
553 15 : os_memcpy(data->nonce_s, nonces + data->sess.nonce_len,
554 : data->sess.nonce_len);
555 30 : wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Nonce_S",
556 30 : data->nonce_s, data->sess.nonce_len);
557 :
558 30 : if (eap_eke_derive_ka(&data->sess, data->serverid, data->serverid_len,
559 15 : data->peerid, data->peerid_len,
560 15 : data->nonce_p, data->nonce_s) < 0) {
561 0 : return eap_eke_build_fail(data, ret, id,
562 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
563 : }
564 :
565 15 : if (eap_eke_auth(&data->sess, "EAP-EKE server", data->msgs, auth_s) < 0)
566 : {
567 0 : return eap_eke_build_fail(data, ret, id,
568 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
569 : }
570 15 : wpa_hexdump(MSG_DEBUG, "EAP-EKE: Auth_S", auth_s, data->sess.prf_len);
571 15 : if (os_memcmp_const(auth_s, pos + data->sess.pnonce_ps_len,
572 15 : data->sess.prf_len) != 0) {
573 0 : wpa_printf(MSG_INFO, "EAP-EKE: Auth_S does not match");
574 0 : return eap_eke_build_fail(data, ret, id,
575 : EAP_EKE_FAIL_AUTHENTICATION_FAIL);
576 : }
577 :
578 15 : wpa_printf(MSG_DEBUG, "EAP-EKE: Sending EAP-EKE-Confirm/Response");
579 :
580 15 : resp = eap_eke_build_msg(data, id,
581 15 : data->sess.pnonce_len + data->sess.prf_len,
582 : EAP_EKE_CONFIRM);
583 15 : if (resp == NULL) {
584 0 : return eap_eke_build_fail(data, ret, id,
585 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
586 : }
587 :
588 15 : prot_len = wpabuf_tailroom(resp);
589 15 : if (eap_eke_prot(&data->sess, data->nonce_s, data->sess.nonce_len,
590 15 : wpabuf_put(resp, 0), &prot_len) < 0) {
591 0 : wpabuf_free(resp);
592 0 : return eap_eke_build_fail(data, ret, id,
593 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
594 : }
595 15 : wpabuf_put(resp, prot_len);
596 :
597 15 : auth = wpabuf_put(resp, data->sess.prf_len);
598 15 : if (eap_eke_auth(&data->sess, "EAP-EKE peer", data->msgs, auth) < 0) {
599 0 : wpabuf_free(resp);
600 0 : return eap_eke_build_fail(data, ret, id,
601 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
602 : }
603 15 : wpa_hexdump(MSG_DEBUG, "EAP-EKE: Auth_P", auth, data->sess.prf_len);
604 :
605 30 : if (eap_eke_derive_msk(&data->sess, data->serverid, data->serverid_len,
606 15 : data->peerid, data->peerid_len,
607 15 : data->nonce_s, data->nonce_p,
608 15 : data->msk, data->emsk) < 0) {
609 0 : wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive MSK/EMSK");
610 0 : wpabuf_free(resp);
611 0 : return eap_eke_build_fail(data, ret, id,
612 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
613 : }
614 :
615 15 : os_memset(data->dh_priv, 0, sizeof(data->dh_priv));
616 15 : eap_eke_session_clean(&data->sess);
617 :
618 15 : eap_eke_state(data, SUCCESS);
619 15 : ret->methodState = METHOD_MAY_CONT;
620 15 : ret->decision = DECISION_COND_SUCC;
621 15 : ret->allowNotifications = FALSE;
622 :
623 15 : return resp;
624 : }
625 :
626 :
627 27 : static struct wpabuf * eap_eke_process_failure(struct eap_eke_data *data,
628 : struct eap_method_ret *ret,
629 : const struct wpabuf *reqData,
630 : const u8 *payload,
631 : size_t payload_len)
632 : {
633 27 : wpa_printf(MSG_DEBUG, "EAP-EKE: Received EAP-EKE-Failure/Request");
634 :
635 27 : if (payload_len < 4) {
636 1 : wpa_printf(MSG_DEBUG, "EAP-EKE: Too short EAP-EKE-Failure");
637 : } else {
638 : u32 code;
639 26 : code = WPA_GET_BE32(payload);
640 26 : wpa_printf(MSG_INFO, "EAP-EKE: Failure-Code 0x%x", code);
641 : }
642 :
643 27 : return eap_eke_build_fail(data, ret, eap_get_id(reqData),
644 : EAP_EKE_FAIL_NO_ERROR);
645 : }
646 :
647 :
648 142 : static struct wpabuf * eap_eke_process(struct eap_sm *sm, void *priv,
649 : struct eap_method_ret *ret,
650 : const struct wpabuf *reqData)
651 : {
652 142 : struct eap_eke_data *data = priv;
653 : struct wpabuf *resp;
654 : const u8 *pos, *end;
655 : size_t len;
656 : u8 eke_exch;
657 :
658 142 : pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_EKE, reqData, &len);
659 142 : if (pos == NULL || len < 1) {
660 1 : ret->ignore = TRUE;
661 1 : return NULL;
662 : }
663 :
664 141 : end = pos + len;
665 141 : eke_exch = *pos++;
666 :
667 141 : wpa_printf(MSG_DEBUG, "EAP-EKE: Received frame: exch %d", eke_exch);
668 141 : wpa_hexdump(MSG_DEBUG, "EAP-EKE: Received Data", pos, end - pos);
669 :
670 141 : ret->ignore = FALSE;
671 141 : ret->methodState = METHOD_MAY_CONT;
672 141 : ret->decision = DECISION_FAIL;
673 141 : ret->allowNotifications = TRUE;
674 :
675 141 : switch (eke_exch) {
676 : case EAP_EKE_ID:
677 59 : resp = eap_eke_process_id(data, ret, reqData, pos, end - pos);
678 59 : break;
679 : case EAP_EKE_COMMIT:
680 36 : resp = eap_eke_process_commit(sm, data, ret, reqData,
681 36 : pos, end - pos);
682 36 : break;
683 : case EAP_EKE_CONFIRM:
684 18 : resp = eap_eke_process_confirm(data, ret, reqData,
685 18 : pos, end - pos);
686 18 : break;
687 : case EAP_EKE_FAILURE:
688 27 : resp = eap_eke_process_failure(data, ret, reqData,
689 27 : pos, end - pos);
690 27 : break;
691 : default:
692 1 : wpa_printf(MSG_DEBUG, "EAP-EKE: Ignoring message with unknown EKE-Exch %d", eke_exch);
693 1 : ret->ignore = TRUE;
694 1 : return NULL;
695 : }
696 :
697 140 : if (ret->methodState == METHOD_DONE)
698 39 : ret->allowNotifications = FALSE;
699 :
700 140 : return resp;
701 : }
702 :
703 :
704 140 : static Boolean eap_eke_isKeyAvailable(struct eap_sm *sm, void *priv)
705 : {
706 140 : struct eap_eke_data *data = priv;
707 140 : return data->state == SUCCESS;
708 : }
709 :
710 :
711 15 : static u8 * eap_eke_getKey(struct eap_sm *sm, void *priv, size_t *len)
712 : {
713 15 : struct eap_eke_data *data = priv;
714 : u8 *key;
715 :
716 15 : if (data->state != SUCCESS)
717 0 : return NULL;
718 :
719 15 : key = os_malloc(EAP_MSK_LEN);
720 15 : if (key == NULL)
721 0 : return NULL;
722 15 : os_memcpy(key, data->msk, EAP_MSK_LEN);
723 15 : *len = EAP_MSK_LEN;
724 :
725 15 : return key;
726 : }
727 :
728 :
729 1 : static u8 * eap_eke_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
730 : {
731 1 : struct eap_eke_data *data = priv;
732 : u8 *key;
733 :
734 1 : if (data->state != SUCCESS)
735 0 : return NULL;
736 :
737 1 : key = os_malloc(EAP_EMSK_LEN);
738 1 : if (key == NULL)
739 0 : return NULL;
740 1 : os_memcpy(key, data->emsk, EAP_EMSK_LEN);
741 1 : *len = EAP_EMSK_LEN;
742 :
743 1 : return key;
744 : }
745 :
746 :
747 15 : static u8 * eap_eke_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
748 : {
749 15 : struct eap_eke_data *data = priv;
750 : u8 *sid;
751 : size_t sid_len;
752 :
753 15 : if (data->state != SUCCESS)
754 0 : return NULL;
755 :
756 15 : sid_len = 1 + 2 * data->sess.nonce_len;
757 15 : sid = os_malloc(sid_len);
758 15 : if (sid == NULL)
759 0 : return NULL;
760 15 : sid[0] = EAP_TYPE_EKE;
761 15 : os_memcpy(sid + 1, data->nonce_p, data->sess.nonce_len);
762 15 : os_memcpy(sid + 1 + data->sess.nonce_len, data->nonce_s,
763 : data->sess.nonce_len);
764 15 : *len = sid_len;
765 :
766 15 : return sid;
767 : }
768 :
769 :
770 49 : int eap_peer_eke_register(void)
771 : {
772 : struct eap_method *eap;
773 : int ret;
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 : ret = eap_peer_method_register(eap);
789 49 : if (ret)
790 0 : eap_peer_method_free(eap);
791 49 : return ret;
792 : }
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