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 :
38 126 : static const char * eap_eke_state_txt(int state)
39 : {
40 126 : switch (state) {
41 : case IDENTITY:
42 64 : return "IDENTITY";
43 : case COMMIT:
44 24 : return "COMMIT";
45 : case CONFIRM:
46 18 : return "CONFIRM";
47 : case SUCCESS:
48 6 : return "SUCCESS";
49 : case FAILURE:
50 14 : return "FAILURE";
51 : default:
52 0 : return "?";
53 : }
54 : }
55 :
56 :
57 63 : static void eap_eke_state(struct eap_eke_data *data, int state)
58 : {
59 126 : wpa_printf(MSG_DEBUG, "EAP-EKE: %s -> %s",
60 63 : eap_eke_state_txt(data->state), eap_eke_state_txt(state));
61 63 : data->state = state;
62 63 : }
63 :
64 :
65 : static void eap_eke_deinit(struct eap_sm *sm, void *priv);
66 :
67 :
68 22 : 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 22 : password = eap_get_config_password(sm, &password_len);
76 22 : if (!password) {
77 0 : wpa_printf(MSG_INFO, "EAP-EKE: No password configured");
78 0 : return NULL;
79 : }
80 :
81 22 : data = os_zalloc(sizeof(*data));
82 22 : if (data == NULL)
83 0 : return NULL;
84 22 : eap_eke_state(data, IDENTITY);
85 :
86 22 : identity = eap_get_config_identity(sm, &identity_len);
87 22 : if (identity) {
88 22 : data->peerid = os_malloc(identity_len);
89 22 : if (data->peerid == NULL) {
90 0 : eap_eke_deinit(sm, data);
91 0 : return NULL;
92 : }
93 22 : os_memcpy(data->peerid, identity, identity_len);
94 22 : data->peerid_len = identity_len;
95 : }
96 :
97 22 : phase1 = eap_get_config_phase1(sm);
98 22 : 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 22 : return data;
131 : }
132 :
133 :
134 22 : static void eap_eke_deinit(struct eap_sm *sm, void *priv)
135 : {
136 22 : struct eap_eke_data *data = priv;
137 22 : eap_eke_session_clean(&data->sess);
138 22 : os_free(data->serverid);
139 22 : os_free(data->peerid);
140 22 : wpabuf_free(data->msgs);
141 22 : bin_clear_free(data, sizeof(*data));
142 22 : }
143 :
144 :
145 41 : 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 41 : plen = 1 + length;
152 :
153 41 : msg = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_EKE, plen,
154 : EAP_CODE_RESPONSE, id);
155 41 : if (msg == NULL) {
156 0 : wpa_printf(MSG_ERROR, "EAP-EKE: Failed to allocate memory");
157 0 : return NULL;
158 : }
159 :
160 41 : wpabuf_put_u8(msg, eke_exch);
161 :
162 41 : return msg;
163 : }
164 :
165 :
166 22 : static int eap_eke_supp_dhgroup(u8 dhgroup)
167 : {
168 42 : return dhgroup == EAP_EKE_DHGROUP_EKE_2 ||
169 20 : dhgroup == EAP_EKE_DHGROUP_EKE_5 ||
170 7 : dhgroup == EAP_EKE_DHGROUP_EKE_14 ||
171 28 : dhgroup == EAP_EKE_DHGROUP_EKE_15 ||
172 : dhgroup == EAP_EKE_DHGROUP_EKE_16;
173 : }
174 :
175 :
176 20 : static int eap_eke_supp_encr(u8 encr)
177 : {
178 20 : return encr == EAP_EKE_ENCR_AES128_CBC;
179 : }
180 :
181 :
182 17 : static int eap_eke_supp_prf(u8 prf)
183 : {
184 17 : return prf == EAP_EKE_PRF_HMAC_SHA1 ||
185 : prf == EAP_EKE_PRF_HMAC_SHA2_256;
186 : }
187 :
188 :
189 15 : static int eap_eke_supp_mac(u8 mac)
190 : {
191 15 : return mac == EAP_EKE_MAC_HMAC_SHA1 ||
192 : mac == EAP_EKE_MAC_HMAC_SHA2_256;
193 : }
194 :
195 :
196 14 : static struct wpabuf * eap_eke_build_fail(struct eap_eke_data *data,
197 : struct eap_method_ret *ret,
198 : const struct wpabuf *reqData,
199 : u32 failure_code)
200 : {
201 : struct wpabuf *resp;
202 :
203 14 : wpa_printf(MSG_DEBUG, "EAP-EKE: Sending EAP-EKE-Failure/Response - code=0x%x",
204 : failure_code);
205 :
206 14 : resp = eap_eke_build_msg(data, eap_get_id(reqData), 4, EAP_EKE_FAILURE);
207 14 : if (resp)
208 14 : wpabuf_put_be32(resp, failure_code);
209 :
210 14 : os_memset(data->dh_priv, 0, sizeof(data->dh_priv));
211 14 : eap_eke_session_clean(&data->sess);
212 :
213 14 : eap_eke_state(data, FAILURE);
214 14 : ret->methodState = METHOD_DONE;
215 14 : ret->decision = DECISION_FAIL;
216 14 : ret->allowNotifications = FALSE;
217 :
218 14 : return resp;
219 : }
220 :
221 :
222 19 : static struct wpabuf * eap_eke_process_id(struct eap_eke_data *data,
223 : struct eap_method_ret *ret,
224 : const struct wpabuf *reqData,
225 : const u8 *payload,
226 : size_t payload_len)
227 : {
228 : struct wpabuf *resp;
229 : unsigned num_prop, i;
230 : const u8 *pos, *end;
231 19 : const u8 *prop = NULL;
232 : u8 idtype;
233 :
234 19 : if (data->state != IDENTITY) {
235 1 : return eap_eke_build_fail(data, ret, reqData,
236 : EAP_EKE_FAIL_PROTO_ERROR);
237 : }
238 :
239 18 : wpa_printf(MSG_DEBUG, "EAP-EKE: Received EAP-EKE-ID/Request");
240 :
241 18 : 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, reqData,
244 : EAP_EKE_FAIL_PROTO_ERROR);
245 : }
246 :
247 16 : pos = payload;
248 16 : end = payload + payload_len;
249 :
250 16 : num_prop = *pos++;
251 16 : pos++; /* Ignore Reserved field */
252 :
253 16 : 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, reqData,
257 : EAP_EKE_FAIL_PROTO_ERROR);
258 : }
259 :
260 33 : for (i = 0; i < num_prop; i++) {
261 31 : const u8 *tmp = pos;
262 :
263 124 : wpa_printf(MSG_DEBUG, "EAP-EKE: Proposal #%u: dh=%u encr=%u prf=%u mac=%u",
264 124 : i, pos[0], pos[1], pos[2], pos[3]);
265 31 : pos += 4;
266 :
267 53 : if ((data->dhgroup && data->dhgroup != *tmp) ||
268 22 : !eap_eke_supp_dhgroup(*tmp))
269 11 : continue;
270 20 : tmp++;
271 40 : if ((data->encr && data->encr != *tmp) ||
272 20 : !eap_eke_supp_encr(*tmp))
273 2 : continue;
274 18 : tmp++;
275 35 : if ((data->prf && data->prf != *tmp) ||
276 17 : !eap_eke_supp_prf(*tmp))
277 3 : continue;
278 15 : tmp++;
279 30 : if ((data->mac && data->mac != *tmp) ||
280 15 : !eap_eke_supp_mac(*tmp))
281 2 : continue;
282 :
283 13 : prop = tmp - 3;
284 13 : if (eap_eke_session_init(&data->sess, prop[0], prop[1], prop[2],
285 13 : prop[3]) < 0) {
286 0 : prop = NULL;
287 0 : continue;
288 : }
289 :
290 13 : wpa_printf(MSG_DEBUG, "EAP-EKE: Selected proposal");
291 13 : break;
292 : }
293 :
294 15 : if (prop == NULL) {
295 2 : wpa_printf(MSG_DEBUG, "EAP-EKE: No acceptable proposal found");
296 2 : return eap_eke_build_fail(data, ret, reqData,
297 : EAP_EKE_FAIL_NO_PROPOSAL_CHOSEN);
298 : }
299 :
300 13 : pos += (num_prop - i - 1) * 4;
301 :
302 13 : 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, reqData,
305 : EAP_EKE_FAIL_PROTO_ERROR);
306 : }
307 :
308 12 : idtype = *pos++;
309 12 : wpa_printf(MSG_DEBUG, "EAP-EKE: Server IDType %u", idtype);
310 12 : wpa_hexdump_ascii(MSG_DEBUG, "EAP-EKE: Server Identity",
311 12 : pos, end - pos);
312 12 : os_free(data->serverid);
313 12 : data->serverid = os_malloc(end - pos);
314 12 : if (data->serverid == NULL) {
315 0 : return eap_eke_build_fail(data, ret, reqData,
316 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
317 : }
318 12 : os_memcpy(data->serverid, pos, end - pos);
319 12 : data->serverid_len = end - pos;
320 :
321 12 : wpa_printf(MSG_DEBUG, "EAP-EKE: Sending EAP-EKE-ID/Response");
322 :
323 12 : resp = eap_eke_build_msg(data, eap_get_id(reqData),
324 12 : 2 + 4 + 1 + data->peerid_len,
325 : EAP_EKE_ID);
326 12 : if (resp == NULL) {
327 0 : return eap_eke_build_fail(data, ret, reqData,
328 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
329 : }
330 :
331 12 : wpabuf_put_u8(resp, 1); /* NumProposals */
332 12 : wpabuf_put_u8(resp, 0); /* Reserved */
333 12 : wpabuf_put_data(resp, prop, 4); /* Selected Proposal */
334 12 : wpabuf_put_u8(resp, EAP_EKE_ID_NAI);
335 12 : if (data->peerid)
336 12 : wpabuf_put_data(resp, data->peerid, data->peerid_len);
337 :
338 12 : wpabuf_free(data->msgs);
339 12 : data->msgs = wpabuf_alloc(wpabuf_len(reqData) + wpabuf_len(resp));
340 12 : if (data->msgs == NULL) {
341 0 : wpabuf_free(resp);
342 0 : return eap_eke_build_fail(data, ret, reqData,
343 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
344 : }
345 12 : wpabuf_put_buf(data->msgs, reqData);
346 12 : wpabuf_put_buf(data->msgs, resp);
347 :
348 12 : eap_eke_state(data, COMMIT);
349 :
350 12 : return resp;
351 : }
352 :
353 :
354 11 : 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 :
370 11 : if (data->state != COMMIT) {
371 1 : wpa_printf(MSG_DEBUG, "EAP-EKE: EAP-EKE-Commit/Request received in unexpected state (%d)", data->state);
372 1 : return eap_eke_build_fail(data, ret, reqData,
373 : EAP_EKE_FAIL_PROTO_ERROR);
374 : }
375 :
376 10 : wpa_printf(MSG_DEBUG, "EAP-EKE: Received EAP-EKE-Commit/Request");
377 :
378 10 : password = eap_get_config_password(sm, &password_len);
379 10 : if (password == NULL) {
380 0 : wpa_printf(MSG_INFO, "EAP-EKE: No password configured!");
381 0 : return eap_eke_build_fail(data, ret, reqData,
382 : EAP_EKE_FAIL_PASSWD_NOT_FOUND);
383 : }
384 :
385 10 : pos = payload;
386 10 : end = payload + payload_len;
387 :
388 10 : if (pos + data->sess.dhcomp_len > end) {
389 1 : wpa_printf(MSG_DEBUG, "EAP-EKE: Too short EAP-EKE-Commit");
390 1 : return eap_eke_build_fail(data, ret, reqData,
391 : EAP_EKE_FAIL_PROTO_ERROR);
392 : }
393 :
394 9 : wpa_hexdump(MSG_DEBUG, "EAP-EKE: DHComponent_S",
395 9 : pos, data->sess.dhcomp_len);
396 9 : dhcomp = pos;
397 9 : pos += data->sess.dhcomp_len;
398 9 : wpa_hexdump(MSG_DEBUG, "EAP-EKE: CBValue", pos, end - pos);
399 :
400 : /*
401 : * temp = prf(0+, password)
402 : * key = prf+(temp, ID_S | ID_P)
403 : */
404 27 : if (eap_eke_derive_key(&data->sess, password, password_len,
405 9 : data->serverid, data->serverid_len,
406 9 : data->peerid, data->peerid_len, key) < 0) {
407 0 : wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive key");
408 0 : return eap_eke_build_fail(data, ret, reqData,
409 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
410 : }
411 :
412 : /*
413 : * y_p = g ^ x_p (mod p)
414 : * x_p = random number 2 .. p-1
415 : */
416 9 : if (eap_eke_dh_init(data->sess.dhgroup, data->dh_priv, pub) < 0) {
417 0 : wpa_printf(MSG_INFO, "EAP-EKE: Failed to initialize DH");
418 0 : os_memset(key, 0, sizeof(key));
419 0 : return eap_eke_build_fail(data, ret, reqData,
420 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
421 : }
422 :
423 9 : if (eap_eke_shared_secret(&data->sess, key, data->dh_priv, dhcomp) < 0)
424 : {
425 0 : wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive shared secret");
426 0 : os_memset(key, 0, sizeof(key));
427 0 : return eap_eke_build_fail(data, ret, reqData,
428 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
429 : }
430 :
431 27 : if (eap_eke_derive_ke_ki(&data->sess,
432 9 : data->serverid, data->serverid_len,
433 9 : data->peerid, data->peerid_len) < 0) {
434 0 : wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive Ke/Ki");
435 0 : os_memset(key, 0, sizeof(key));
436 0 : return eap_eke_build_fail(data, ret, reqData,
437 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
438 : }
439 :
440 9 : wpa_printf(MSG_DEBUG, "EAP-EKE: Sending EAP-EKE-Commit/Response");
441 :
442 9 : resp = eap_eke_build_msg(data, eap_get_id(reqData),
443 9 : data->sess.dhcomp_len + data->sess.pnonce_len,
444 : EAP_EKE_COMMIT);
445 9 : if (resp == NULL) {
446 0 : os_memset(key, 0, sizeof(key));
447 0 : return eap_eke_build_fail(data, ret, reqData,
448 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
449 : }
450 :
451 : /* DHComponent_P = Encr(key, y_p) */
452 9 : rpos = wpabuf_put(resp, data->sess.dhcomp_len);
453 9 : if (eap_eke_dhcomp(&data->sess, key, pub, rpos) < 0) {
454 0 : wpa_printf(MSG_INFO, "EAP-EKE: Failed to build DHComponent_P");
455 0 : os_memset(key, 0, sizeof(key));
456 0 : return eap_eke_build_fail(data, ret, reqData,
457 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
458 : }
459 9 : os_memset(key, 0, sizeof(key));
460 :
461 9 : wpa_hexdump(MSG_DEBUG, "EAP-EKE: DHComponent_P",
462 9 : rpos, data->sess.dhcomp_len);
463 :
464 9 : if (random_get_bytes(data->nonce_p, data->sess.nonce_len)) {
465 0 : wpabuf_free(resp);
466 0 : return eap_eke_build_fail(data, ret, reqData,
467 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
468 : }
469 18 : wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Nonce_P",
470 18 : data->nonce_p, data->sess.nonce_len);
471 9 : prot_len = wpabuf_tailroom(resp);
472 9 : if (eap_eke_prot(&data->sess, data->nonce_p, data->sess.nonce_len,
473 9 : wpabuf_put(resp, 0), &prot_len) < 0) {
474 0 : wpabuf_free(resp);
475 0 : return eap_eke_build_fail(data, ret, reqData,
476 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
477 : }
478 18 : wpa_hexdump(MSG_DEBUG, "EAP-EKE: PNonce_P",
479 9 : wpabuf_put(resp, 0), prot_len);
480 9 : wpabuf_put(resp, prot_len);
481 :
482 : /* TODO: CBValue */
483 :
484 9 : if (wpabuf_resize(&data->msgs, wpabuf_len(reqData) + wpabuf_len(resp))
485 : < 0) {
486 0 : wpabuf_free(resp);
487 0 : return eap_eke_build_fail(data, ret, reqData,
488 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
489 : }
490 9 : wpabuf_put_buf(data->msgs, reqData);
491 9 : wpabuf_put_buf(data->msgs, resp);
492 :
493 9 : eap_eke_state(data, CONFIRM);
494 :
495 9 : return resp;
496 : }
497 :
498 :
499 9 : static struct wpabuf * eap_eke_process_confirm(struct eap_eke_data *data,
500 : struct eap_method_ret *ret,
501 : const struct wpabuf *reqData,
502 : const u8 *payload,
503 : size_t payload_len)
504 : {
505 : struct wpabuf *resp;
506 : const u8 *pos, *end;
507 : size_t prot_len;
508 : u8 nonces[2 * EAP_EKE_MAX_NONCE_LEN];
509 : u8 auth_s[EAP_EKE_MAX_HASH_LEN];
510 : size_t decrypt_len;
511 : u8 *auth;
512 :
513 9 : if (data->state != CONFIRM) {
514 1 : wpa_printf(MSG_DEBUG, "EAP-EKE: EAP-EKE-Confirm/Request received in unexpected state (%d)",
515 1 : data->state);
516 1 : return eap_eke_build_fail(data, ret, reqData,
517 : EAP_EKE_FAIL_PROTO_ERROR);
518 : }
519 :
520 8 : wpa_printf(MSG_DEBUG, "EAP-EKE: Received EAP-EKE-Confirm/Request");
521 :
522 8 : pos = payload;
523 8 : end = payload + payload_len;
524 :
525 8 : if (pos + data->sess.pnonce_ps_len + data->sess.prf_len > end) {
526 1 : wpa_printf(MSG_DEBUG, "EAP-EKE: Too short EAP-EKE-Confirm");
527 1 : return eap_eke_build_fail(data, ret, reqData,
528 : EAP_EKE_FAIL_PROTO_ERROR);
529 : }
530 :
531 7 : decrypt_len = sizeof(nonces);
532 7 : if (eap_eke_decrypt_prot(&data->sess, pos, data->sess.pnonce_ps_len,
533 : nonces, &decrypt_len) < 0) {
534 1 : wpa_printf(MSG_INFO, "EAP-EKE: Failed to decrypt PNonce_PS");
535 1 : return eap_eke_build_fail(data, ret, reqData,
536 : EAP_EKE_FAIL_AUTHENTICATION_FAIL);
537 : }
538 6 : if (decrypt_len != (size_t) 2 * data->sess.nonce_len) {
539 0 : wpa_printf(MSG_INFO, "EAP-EKE: PNonce_PS protected data length does not match length of Nonce_P and Nonce_S");
540 0 : return eap_eke_build_fail(data, ret, reqData,
541 : EAP_EKE_FAIL_AUTHENTICATION_FAIL);
542 : }
543 6 : wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Received Nonce_P | Nonce_S",
544 6 : nonces, 2 * data->sess.nonce_len);
545 6 : if (os_memcmp(data->nonce_p, nonces, data->sess.nonce_len) != 0) {
546 0 : wpa_printf(MSG_INFO, "EAP-EKE: Received Nonce_P does not match transmitted Nonce_P");
547 0 : return eap_eke_build_fail(data, ret, reqData,
548 : EAP_EKE_FAIL_AUTHENTICATION_FAIL);
549 : }
550 :
551 6 : os_memcpy(data->nonce_s, nonces + data->sess.nonce_len,
552 : data->sess.nonce_len);
553 12 : wpa_hexdump_key(MSG_DEBUG, "EAP-EKE: Nonce_S",
554 12 : data->nonce_s, data->sess.nonce_len);
555 :
556 12 : if (eap_eke_derive_ka(&data->sess, data->serverid, data->serverid_len,
557 6 : data->peerid, data->peerid_len,
558 6 : data->nonce_p, data->nonce_s) < 0) {
559 0 : return eap_eke_build_fail(data, ret, reqData,
560 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
561 : }
562 :
563 6 : if (eap_eke_auth(&data->sess, "EAP-EKE server", data->msgs, auth_s) < 0)
564 : {
565 0 : return eap_eke_build_fail(data, ret, reqData,
566 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
567 : }
568 6 : wpa_hexdump(MSG_DEBUG, "EAP-EKE: Auth_S", auth_s, data->sess.prf_len);
569 6 : if (os_memcmp_const(auth_s, pos + data->sess.pnonce_ps_len,
570 6 : data->sess.prf_len) != 0) {
571 0 : wpa_printf(MSG_INFO, "EAP-EKE: Auth_S does not match");
572 0 : return eap_eke_build_fail(data, ret, reqData,
573 : EAP_EKE_FAIL_AUTHENTICATION_FAIL);
574 : }
575 :
576 6 : wpa_printf(MSG_DEBUG, "EAP-EKE: Sending EAP-EKE-Confirm/Response");
577 :
578 6 : resp = eap_eke_build_msg(data, eap_get_id(reqData),
579 6 : data->sess.pnonce_len + data->sess.prf_len,
580 : EAP_EKE_CONFIRM);
581 6 : if (resp == NULL) {
582 0 : return eap_eke_build_fail(data, ret, reqData,
583 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
584 : }
585 :
586 6 : prot_len = wpabuf_tailroom(resp);
587 6 : if (eap_eke_prot(&data->sess, data->nonce_s, data->sess.nonce_len,
588 6 : wpabuf_put(resp, 0), &prot_len) < 0) {
589 0 : wpabuf_free(resp);
590 0 : return eap_eke_build_fail(data, ret, reqData,
591 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
592 : }
593 6 : wpabuf_put(resp, prot_len);
594 :
595 6 : auth = wpabuf_put(resp, data->sess.prf_len);
596 6 : if (eap_eke_auth(&data->sess, "EAP-EKE peer", data->msgs, auth) < 0) {
597 0 : wpabuf_free(resp);
598 0 : return eap_eke_build_fail(data, ret, reqData,
599 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
600 : }
601 6 : wpa_hexdump(MSG_DEBUG, "EAP-EKE: Auth_P", auth, data->sess.prf_len);
602 :
603 12 : if (eap_eke_derive_msk(&data->sess, data->serverid, data->serverid_len,
604 6 : data->peerid, data->peerid_len,
605 6 : data->nonce_s, data->nonce_p,
606 6 : data->msk, data->emsk) < 0) {
607 0 : wpa_printf(MSG_INFO, "EAP-EKE: Failed to derive MSK/EMSK");
608 0 : wpabuf_free(resp);
609 0 : return eap_eke_build_fail(data, ret, reqData,
610 : EAP_EKE_FAIL_PRIVATE_INTERNAL_ERROR);
611 : }
612 :
613 6 : os_memset(data->dh_priv, 0, sizeof(data->dh_priv));
614 6 : eap_eke_session_clean(&data->sess);
615 :
616 6 : eap_eke_state(data, SUCCESS);
617 6 : ret->methodState = METHOD_MAY_CONT;
618 6 : ret->decision = DECISION_COND_SUCC;
619 6 : ret->allowNotifications = FALSE;
620 :
621 6 : return resp;
622 : }
623 :
624 :
625 2 : static struct wpabuf * eap_eke_process_failure(struct eap_eke_data *data,
626 : struct eap_method_ret *ret,
627 : const struct wpabuf *reqData,
628 : const u8 *payload,
629 : size_t payload_len)
630 : {
631 2 : wpa_printf(MSG_DEBUG, "EAP-EKE: Received EAP-EKE-Failure/Request");
632 :
633 2 : if (payload_len < 4) {
634 1 : wpa_printf(MSG_DEBUG, "EAP-EKE: Too short EAP-EKE-Failure");
635 : } else {
636 : u32 code;
637 1 : code = WPA_GET_BE32(payload);
638 1 : wpa_printf(MSG_INFO, "EAP-EKE: Failure-Code 0x%x", code);
639 : }
640 :
641 2 : return eap_eke_build_fail(data, ret, reqData, EAP_EKE_FAIL_NO_ERROR);
642 : }
643 :
644 :
645 43 : static struct wpabuf * eap_eke_process(struct eap_sm *sm, void *priv,
646 : struct eap_method_ret *ret,
647 : const struct wpabuf *reqData)
648 : {
649 43 : struct eap_eke_data *data = priv;
650 : struct wpabuf *resp;
651 : const u8 *pos, *end;
652 : size_t len;
653 : u8 eke_exch;
654 :
655 43 : pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_EKE, reqData, &len);
656 43 : if (pos == NULL || len < 1) {
657 1 : ret->ignore = TRUE;
658 1 : return NULL;
659 : }
660 :
661 42 : end = pos + len;
662 42 : eke_exch = *pos++;
663 :
664 42 : wpa_printf(MSG_DEBUG, "EAP-EKE: Received frame: exch %d", eke_exch);
665 42 : wpa_hexdump(MSG_DEBUG, "EAP-EKE: Received Data", pos, end - pos);
666 :
667 42 : ret->ignore = FALSE;
668 42 : ret->methodState = METHOD_MAY_CONT;
669 42 : ret->decision = DECISION_FAIL;
670 42 : ret->allowNotifications = TRUE;
671 :
672 42 : switch (eke_exch) {
673 : case EAP_EKE_ID:
674 19 : resp = eap_eke_process_id(data, ret, reqData, pos, end - pos);
675 19 : break;
676 : case EAP_EKE_COMMIT:
677 11 : resp = eap_eke_process_commit(sm, data, ret, reqData,
678 11 : pos, end - pos);
679 11 : break;
680 : case EAP_EKE_CONFIRM:
681 9 : resp = eap_eke_process_confirm(data, ret, reqData,
682 9 : pos, end - pos);
683 9 : break;
684 : case EAP_EKE_FAILURE:
685 2 : resp = eap_eke_process_failure(data, ret, reqData,
686 2 : pos, end - pos);
687 2 : break;
688 : default:
689 1 : wpa_printf(MSG_DEBUG, "EAP-EKE: Ignoring message with unknown EKE-Exch %d", eke_exch);
690 1 : ret->ignore = TRUE;
691 1 : return NULL;
692 : }
693 :
694 41 : if (ret->methodState == METHOD_DONE)
695 14 : ret->allowNotifications = FALSE;
696 :
697 41 : return resp;
698 : }
699 :
700 :
701 41 : static Boolean eap_eke_isKeyAvailable(struct eap_sm *sm, void *priv)
702 : {
703 41 : struct eap_eke_data *data = priv;
704 41 : return data->state == SUCCESS;
705 : }
706 :
707 :
708 6 : static u8 * eap_eke_getKey(struct eap_sm *sm, void *priv, size_t *len)
709 : {
710 6 : struct eap_eke_data *data = priv;
711 : u8 *key;
712 :
713 6 : if (data->state != SUCCESS)
714 0 : return NULL;
715 :
716 6 : key = os_malloc(EAP_MSK_LEN);
717 6 : if (key == NULL)
718 0 : return NULL;
719 6 : os_memcpy(key, data->msk, EAP_MSK_LEN);
720 6 : *len = EAP_MSK_LEN;
721 :
722 6 : return key;
723 : }
724 :
725 :
726 0 : static u8 * eap_eke_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
727 : {
728 0 : struct eap_eke_data *data = priv;
729 : u8 *key;
730 :
731 0 : if (data->state != SUCCESS)
732 0 : return NULL;
733 :
734 0 : key = os_malloc(EAP_EMSK_LEN);
735 0 : if (key == NULL)
736 0 : return NULL;
737 0 : os_memcpy(key, data->emsk, EAP_EMSK_LEN);
738 0 : *len = EAP_EMSK_LEN;
739 :
740 0 : return key;
741 : }
742 :
743 :
744 30 : int eap_peer_eke_register(void)
745 : {
746 : struct eap_method *eap;
747 : int ret;
748 :
749 30 : eap = eap_peer_method_alloc(EAP_PEER_METHOD_INTERFACE_VERSION,
750 : EAP_VENDOR_IETF, EAP_TYPE_EKE, "EKE");
751 30 : if (eap == NULL)
752 0 : return -1;
753 :
754 30 : eap->init = eap_eke_init;
755 30 : eap->deinit = eap_eke_deinit;
756 30 : eap->process = eap_eke_process;
757 30 : eap->isKeyAvailable = eap_eke_isKeyAvailable;
758 30 : eap->getKey = eap_eke_getKey;
759 30 : eap->get_emsk = eap_eke_get_emsk;
760 :
761 30 : ret = eap_peer_method_register(eap);
762 30 : if (ret)
763 0 : eap_peer_method_free(eap);
764 30 : return ret;
765 : }
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