Line data Source code
1 : /*
2 : * EAP-FAST server (RFC 4851)
3 : * Copyright (c) 2004-2008, 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/aes_wrap.h"
13 : #include "crypto/sha1.h"
14 : #include "crypto/tls.h"
15 : #include "crypto/random.h"
16 : #include "eap_common/eap_tlv_common.h"
17 : #include "eap_common/eap_fast_common.h"
18 : #include "eap_i.h"
19 : #include "eap_tls_common.h"
20 :
21 :
22 : static void eap_fast_reset(struct eap_sm *sm, void *priv);
23 :
24 :
25 : /* Private PAC-Opaque TLV types */
26 : #define PAC_OPAQUE_TYPE_PAD 0
27 : #define PAC_OPAQUE_TYPE_KEY 1
28 : #define PAC_OPAQUE_TYPE_LIFETIME 2
29 : #define PAC_OPAQUE_TYPE_IDENTITY 3
30 :
31 : struct eap_fast_data {
32 : struct eap_ssl_data ssl;
33 : enum {
34 : START, PHASE1, PHASE2_START, PHASE2_ID, PHASE2_METHOD,
35 : CRYPTO_BINDING, REQUEST_PAC, SUCCESS, FAILURE
36 : } state;
37 :
38 : int fast_version;
39 : const struct eap_method *phase2_method;
40 : void *phase2_priv;
41 : int force_version;
42 : int peer_version;
43 :
44 : u8 crypto_binding_nonce[32];
45 : int final_result;
46 :
47 : struct eap_fast_key_block_provisioning *key_block_p;
48 :
49 : u8 simck[EAP_FAST_SIMCK_LEN];
50 : u8 cmk[EAP_FAST_CMK_LEN];
51 : int simck_idx;
52 :
53 : u8 pac_opaque_encr[16];
54 : u8 *srv_id;
55 : size_t srv_id_len;
56 : char *srv_id_info;
57 :
58 : int anon_provisioning;
59 : int send_new_pac; /* server triggered re-keying of Tunnel PAC */
60 : struct wpabuf *pending_phase2_resp;
61 : u8 *identity; /* from PAC-Opaque */
62 : size_t identity_len;
63 : int eap_seq;
64 : int tnc_started;
65 :
66 : int pac_key_lifetime;
67 : int pac_key_refresh_time;
68 : };
69 :
70 :
71 : static int eap_fast_process_phase2_start(struct eap_sm *sm,
72 : struct eap_fast_data *data);
73 :
74 :
75 18 : static const char * eap_fast_state_txt(int state)
76 : {
77 18 : switch (state) {
78 : case START:
79 1 : return "START";
80 : case PHASE1:
81 2 : return "PHASE1";
82 : case PHASE2_START:
83 2 : return "PHASE2_START";
84 : case PHASE2_ID:
85 2 : return "PHASE2_ID";
86 : case PHASE2_METHOD:
87 4 : return "PHASE2_METHOD";
88 : case CRYPTO_BINDING:
89 4 : return "CRYPTO_BINDING";
90 : case REQUEST_PAC:
91 2 : return "REQUEST_PAC";
92 : case SUCCESS:
93 1 : return "SUCCESS";
94 : case FAILURE:
95 0 : return "FAILURE";
96 : default:
97 0 : return "Unknown?!";
98 : }
99 : }
100 :
101 :
102 9 : static void eap_fast_state(struct eap_fast_data *data, int state)
103 : {
104 18 : wpa_printf(MSG_DEBUG, "EAP-FAST: %s -> %s",
105 9 : eap_fast_state_txt(data->state),
106 : eap_fast_state_txt(state));
107 9 : data->state = state;
108 9 : }
109 :
110 :
111 0 : static EapType eap_fast_req_failure(struct eap_sm *sm,
112 : struct eap_fast_data *data)
113 : {
114 : /* TODO: send Result TLV(FAILURE) */
115 0 : eap_fast_state(data, FAILURE);
116 0 : return EAP_TYPE_NONE;
117 : }
118 :
119 :
120 1 : static int eap_fast_session_ticket_cb(void *ctx, const u8 *ticket, size_t len,
121 : const u8 *client_random,
122 : const u8 *server_random,
123 : u8 *master_secret)
124 : {
125 1 : struct eap_fast_data *data = ctx;
126 : const u8 *pac_opaque;
127 : size_t pac_opaque_len;
128 1 : u8 *buf, *pos, *end, *pac_key = NULL;
129 1 : os_time_t lifetime = 0;
130 : struct os_time now;
131 1 : u8 *identity = NULL;
132 1 : size_t identity_len = 0;
133 :
134 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
135 1 : wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket (PAC-Opaque)",
136 : ticket, len);
137 :
138 1 : if (len < 4 || WPA_GET_BE16(ticket) != PAC_TYPE_PAC_OPAQUE) {
139 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid "
140 : "SessionTicket");
141 1 : return 0;
142 : }
143 :
144 0 : pac_opaque_len = WPA_GET_BE16(ticket + 2);
145 0 : pac_opaque = ticket + 4;
146 0 : if (pac_opaque_len < 8 || pac_opaque_len % 8 ||
147 0 : pac_opaque_len > len - 4) {
148 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid PAC-Opaque "
149 : "(len=%lu left=%lu)",
150 : (unsigned long) pac_opaque_len,
151 : (unsigned long) len);
152 0 : return 0;
153 : }
154 0 : wpa_hexdump(MSG_DEBUG, "EAP-FAST: Received PAC-Opaque",
155 : pac_opaque, pac_opaque_len);
156 :
157 0 : buf = os_malloc(pac_opaque_len - 8);
158 0 : if (buf == NULL) {
159 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to allocate memory "
160 : "for decrypting PAC-Opaque");
161 0 : return 0;
162 : }
163 :
164 0 : if (aes_unwrap(data->pac_opaque_encr, (pac_opaque_len - 8) / 8,
165 : pac_opaque, buf) < 0) {
166 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to decrypt "
167 : "PAC-Opaque");
168 0 : os_free(buf);
169 : /*
170 : * This may have been caused by server changing the PAC-Opaque
171 : * encryption key, so just ignore this PAC-Opaque instead of
172 : * failing the authentication completely. Provisioning can now
173 : * be used to provision a new PAC.
174 : */
175 0 : return 0;
176 : }
177 :
178 0 : end = buf + pac_opaque_len - 8;
179 0 : wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Decrypted PAC-Opaque",
180 0 : buf, end - buf);
181 :
182 0 : pos = buf;
183 0 : while (pos + 1 < end) {
184 0 : if (pos + 2 + pos[1] > end)
185 0 : break;
186 :
187 0 : switch (*pos) {
188 : case PAC_OPAQUE_TYPE_PAD:
189 0 : pos = end;
190 0 : break;
191 : case PAC_OPAQUE_TYPE_KEY:
192 0 : if (pos[1] != EAP_FAST_PAC_KEY_LEN) {
193 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
194 0 : "PAC-Key length %d", pos[1]);
195 0 : os_free(buf);
196 0 : return -1;
197 : }
198 0 : pac_key = pos + 2;
199 0 : wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key from "
200 : "decrypted PAC-Opaque",
201 : pac_key, EAP_FAST_PAC_KEY_LEN);
202 0 : break;
203 : case PAC_OPAQUE_TYPE_LIFETIME:
204 0 : if (pos[1] != 4) {
205 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
206 : "PAC-Key lifetime length %d",
207 0 : pos[1]);
208 0 : os_free(buf);
209 0 : return -1;
210 : }
211 0 : lifetime = WPA_GET_BE32(pos + 2);
212 0 : break;
213 : case PAC_OPAQUE_TYPE_IDENTITY:
214 0 : identity = pos + 2;
215 0 : identity_len = pos[1];
216 0 : break;
217 : }
218 :
219 0 : pos += 2 + pos[1];
220 : }
221 :
222 0 : if (pac_key == NULL) {
223 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key included in "
224 : "PAC-Opaque");
225 0 : os_free(buf);
226 0 : return -1;
227 : }
228 :
229 0 : if (identity) {
230 0 : wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Identity from "
231 : "PAC-Opaque", identity, identity_len);
232 0 : os_free(data->identity);
233 0 : data->identity = os_malloc(identity_len);
234 0 : if (data->identity) {
235 0 : os_memcpy(data->identity, identity, identity_len);
236 0 : data->identity_len = identity_len;
237 : }
238 : }
239 :
240 0 : if (os_get_time(&now) < 0 || lifetime <= 0 || now.sec > lifetime) {
241 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key not valid anymore "
242 : "(lifetime=%ld now=%ld)", lifetime, now.sec);
243 0 : data->send_new_pac = 2;
244 : /*
245 : * Allow PAC to be used to allow a PAC update with some level
246 : * of server authentication (i.e., do not fall back to full TLS
247 : * handshake since we cannot be sure that the peer would be
248 : * able to validate server certificate now). However, reject
249 : * the authentication since the PAC was not valid anymore. Peer
250 : * can connect again with the newly provisioned PAC after this.
251 : */
252 0 : } else if (lifetime - now.sec < data->pac_key_refresh_time) {
253 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key soft timeout; send "
254 : "an update if authentication succeeds");
255 0 : data->send_new_pac = 1;
256 : }
257 :
258 0 : eap_fast_derive_master_secret(pac_key, server_random, client_random,
259 : master_secret);
260 :
261 0 : os_free(buf);
262 :
263 0 : return 1;
264 : }
265 :
266 :
267 1 : static void eap_fast_derive_key_auth(struct eap_sm *sm,
268 : struct eap_fast_data *data)
269 : {
270 : u8 *sks;
271 :
272 : /* RFC 4851, Section 5.1:
273 : * Extra key material after TLS key_block: session_key_seed[40]
274 : */
275 :
276 1 : sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion",
277 : EAP_FAST_SKS_LEN);
278 1 : if (sks == NULL) {
279 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
280 : "session_key_seed");
281 1 : return;
282 : }
283 :
284 : /*
285 : * RFC 4851, Section 5.2:
286 : * S-IMCK[0] = session_key_seed
287 : */
288 1 : wpa_hexdump_key(MSG_DEBUG,
289 : "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
290 : sks, EAP_FAST_SKS_LEN);
291 1 : data->simck_idx = 0;
292 1 : os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
293 1 : os_free(sks);
294 : }
295 :
296 :
297 0 : static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
298 : struct eap_fast_data *data)
299 : {
300 0 : os_free(data->key_block_p);
301 0 : data->key_block_p = (struct eap_fast_key_block_provisioning *)
302 0 : eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
303 : "key expansion",
304 : sizeof(*data->key_block_p));
305 0 : if (data->key_block_p == NULL) {
306 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
307 0 : return;
308 : }
309 : /*
310 : * RFC 4851, Section 5.2:
311 : * S-IMCK[0] = session_key_seed
312 : */
313 0 : wpa_hexdump_key(MSG_DEBUG,
314 : "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
315 0 : data->key_block_p->session_key_seed,
316 : sizeof(data->key_block_p->session_key_seed));
317 0 : data->simck_idx = 0;
318 0 : os_memcpy(data->simck, data->key_block_p->session_key_seed,
319 : EAP_FAST_SIMCK_LEN);
320 0 : wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
321 0 : data->key_block_p->server_challenge,
322 : sizeof(data->key_block_p->server_challenge));
323 0 : wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
324 0 : data->key_block_p->client_challenge,
325 : sizeof(data->key_block_p->client_challenge));
326 : }
327 :
328 :
329 2 : static int eap_fast_get_phase2_key(struct eap_sm *sm,
330 : struct eap_fast_data *data,
331 : u8 *isk, size_t isk_len)
332 : {
333 : u8 *key;
334 : size_t key_len;
335 :
336 2 : os_memset(isk, 0, isk_len);
337 :
338 2 : if (data->phase2_method == NULL || data->phase2_priv == NULL) {
339 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
340 : "available");
341 0 : return -1;
342 : }
343 :
344 2 : if (data->phase2_method->getKey == NULL)
345 2 : return 0;
346 :
347 0 : if ((key = data->phase2_method->getKey(sm, data->phase2_priv,
348 : &key_len)) == NULL) {
349 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
350 : "from Phase 2");
351 0 : return -1;
352 : }
353 :
354 0 : if (key_len > isk_len)
355 0 : key_len = isk_len;
356 0 : if (key_len == 32 &&
357 0 : data->phase2_method->vendor == EAP_VENDOR_IETF &&
358 0 : data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
359 : /*
360 : * EAP-FAST uses reverse order for MS-MPPE keys when deriving
361 : * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct
362 : * ISK for EAP-FAST cryptobinding.
363 : */
364 0 : os_memcpy(isk, key + 16, 16);
365 0 : os_memcpy(isk + 16, key, 16);
366 : } else
367 0 : os_memcpy(isk, key, key_len);
368 0 : os_free(key);
369 :
370 0 : return 0;
371 : }
372 :
373 :
374 2 : static int eap_fast_update_icmk(struct eap_sm *sm, struct eap_fast_data *data)
375 : {
376 : u8 isk[32], imck[60];
377 :
378 2 : wpa_printf(MSG_DEBUG, "EAP-FAST: Deriving ICMK[%d] (S-IMCK and CMK)",
379 2 : data->simck_idx + 1);
380 :
381 : /*
382 : * RFC 4851, Section 5.2:
383 : * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
384 : * MSK[j], 60)
385 : * S-IMCK[j] = first 40 octets of IMCK[j]
386 : * CMK[j] = last 20 octets of IMCK[j]
387 : */
388 :
389 2 : if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
390 0 : return -1;
391 2 : wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
392 2 : sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
393 : "Inner Methods Compound Keys",
394 : isk, sizeof(isk), imck, sizeof(imck));
395 2 : data->simck_idx++;
396 2 : os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
397 2 : wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
398 2 : data->simck, EAP_FAST_SIMCK_LEN);
399 2 : os_memcpy(data->cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
400 2 : wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
401 2 : data->cmk, EAP_FAST_CMK_LEN);
402 :
403 2 : return 0;
404 : }
405 :
406 :
407 1 : static void * eap_fast_init(struct eap_sm *sm)
408 : {
409 : struct eap_fast_data *data;
410 1 : u8 ciphers[5] = {
411 : TLS_CIPHER_ANON_DH_AES128_SHA,
412 : TLS_CIPHER_AES128_SHA,
413 : TLS_CIPHER_RSA_DHE_AES128_SHA,
414 : TLS_CIPHER_RC4_SHA,
415 : TLS_CIPHER_NONE
416 : };
417 :
418 1 : data = os_zalloc(sizeof(*data));
419 1 : if (data == NULL)
420 0 : return NULL;
421 1 : data->fast_version = EAP_FAST_VERSION;
422 1 : data->force_version = -1;
423 1 : if (sm->user && sm->user->force_version >= 0) {
424 0 : data->force_version = sm->user->force_version;
425 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: forcing version %d",
426 : data->force_version);
427 0 : data->fast_version = data->force_version;
428 : }
429 1 : data->state = START;
430 :
431 1 : if (eap_server_tls_ssl_init(sm, &data->ssl, 0)) {
432 0 : wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
433 0 : eap_fast_reset(sm, data);
434 0 : return NULL;
435 : }
436 :
437 1 : if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
438 : ciphers) < 0) {
439 0 : wpa_printf(MSG_INFO, "EAP-FAST: Failed to set TLS cipher "
440 : "suites");
441 0 : eap_fast_reset(sm, data);
442 0 : return NULL;
443 : }
444 :
445 1 : if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
446 : eap_fast_session_ticket_cb,
447 : data) < 0) {
448 0 : wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
449 : "callback");
450 0 : eap_fast_reset(sm, data);
451 0 : return NULL;
452 : }
453 :
454 1 : if (sm->pac_opaque_encr_key == NULL) {
455 0 : wpa_printf(MSG_INFO, "EAP-FAST: No PAC-Opaque encryption key "
456 : "configured");
457 0 : eap_fast_reset(sm, data);
458 0 : return NULL;
459 : }
460 1 : os_memcpy(data->pac_opaque_encr, sm->pac_opaque_encr_key,
461 : sizeof(data->pac_opaque_encr));
462 :
463 1 : if (sm->eap_fast_a_id == NULL) {
464 0 : wpa_printf(MSG_INFO, "EAP-FAST: No A-ID configured");
465 0 : eap_fast_reset(sm, data);
466 0 : return NULL;
467 : }
468 1 : data->srv_id = os_malloc(sm->eap_fast_a_id_len);
469 1 : if (data->srv_id == NULL) {
470 0 : eap_fast_reset(sm, data);
471 0 : return NULL;
472 : }
473 1 : os_memcpy(data->srv_id, sm->eap_fast_a_id, sm->eap_fast_a_id_len);
474 1 : data->srv_id_len = sm->eap_fast_a_id_len;
475 :
476 1 : if (sm->eap_fast_a_id_info == NULL) {
477 0 : wpa_printf(MSG_INFO, "EAP-FAST: No A-ID-Info configured");
478 0 : eap_fast_reset(sm, data);
479 0 : return NULL;
480 : }
481 1 : data->srv_id_info = os_strdup(sm->eap_fast_a_id_info);
482 1 : if (data->srv_id_info == NULL) {
483 0 : eap_fast_reset(sm, data);
484 0 : return NULL;
485 : }
486 :
487 : /* PAC-Key lifetime in seconds (hard limit) */
488 1 : data->pac_key_lifetime = sm->pac_key_lifetime;
489 :
490 : /*
491 : * PAC-Key refresh time in seconds (soft limit on remaining hard
492 : * limit). The server will generate a new PAC-Key when this number of
493 : * seconds (or fewer) of the lifetime remains.
494 : */
495 1 : data->pac_key_refresh_time = sm->pac_key_refresh_time;
496 :
497 1 : return data;
498 : }
499 :
500 :
501 1 : static void eap_fast_reset(struct eap_sm *sm, void *priv)
502 : {
503 1 : struct eap_fast_data *data = priv;
504 1 : if (data == NULL)
505 1 : return;
506 1 : if (data->phase2_priv && data->phase2_method)
507 0 : data->phase2_method->reset(sm, data->phase2_priv);
508 1 : eap_server_tls_ssl_deinit(sm, &data->ssl);
509 1 : os_free(data->srv_id);
510 1 : os_free(data->srv_id_info);
511 1 : os_free(data->key_block_p);
512 1 : wpabuf_free(data->pending_phase2_resp);
513 1 : os_free(data->identity);
514 1 : os_free(data);
515 : }
516 :
517 :
518 1 : static struct wpabuf * eap_fast_build_start(struct eap_sm *sm,
519 : struct eap_fast_data *data, u8 id)
520 : {
521 : struct wpabuf *req;
522 :
523 2 : req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_FAST,
524 1 : 1 + sizeof(struct pac_tlv_hdr) + data->srv_id_len,
525 : EAP_CODE_REQUEST, id);
526 1 : if (req == NULL) {
527 0 : wpa_printf(MSG_ERROR, "EAP-FAST: Failed to allocate memory for"
528 : " request");
529 0 : eap_fast_state(data, FAILURE);
530 0 : return NULL;
531 : }
532 :
533 1 : wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->fast_version);
534 :
535 : /* RFC 4851, 4.1.1. Authority ID Data */
536 1 : eap_fast_put_tlv(req, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
537 :
538 1 : eap_fast_state(data, PHASE1);
539 :
540 1 : return req;
541 : }
542 :
543 :
544 1 : static int eap_fast_phase1_done(struct eap_sm *sm, struct eap_fast_data *data)
545 : {
546 : char cipher[64];
547 :
548 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: Phase1 done, starting Phase2");
549 :
550 1 : if (tls_get_cipher(sm->ssl_ctx, data->ssl.conn, cipher, sizeof(cipher))
551 : < 0) {
552 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to get cipher "
553 : "information");
554 0 : eap_fast_state(data, FAILURE);
555 0 : return -1;
556 : }
557 1 : data->anon_provisioning = os_strstr(cipher, "ADH") != NULL;
558 :
559 1 : if (data->anon_provisioning) {
560 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Anonymous provisioning");
561 0 : eap_fast_derive_key_provisioning(sm, data);
562 : } else
563 1 : eap_fast_derive_key_auth(sm, data);
564 :
565 1 : eap_fast_state(data, PHASE2_START);
566 :
567 1 : return 0;
568 : }
569 :
570 :
571 6 : static struct wpabuf * eap_fast_build_phase2_req(struct eap_sm *sm,
572 : struct eap_fast_data *data,
573 : u8 id)
574 : {
575 : struct wpabuf *req;
576 :
577 6 : if (data->phase2_priv == NULL) {
578 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
579 : "initialized");
580 0 : return NULL;
581 : }
582 6 : req = data->phase2_method->buildReq(sm, data->phase2_priv, id);
583 6 : if (req == NULL)
584 0 : return NULL;
585 :
586 6 : wpa_hexdump_buf_key(MSG_MSGDUMP, "EAP-FAST: Phase 2 EAP-Request", req);
587 6 : return eap_fast_tlv_eap_payload(req);
588 : }
589 :
590 :
591 2 : static struct wpabuf * eap_fast_build_crypto_binding(
592 : struct eap_sm *sm, struct eap_fast_data *data)
593 : {
594 : struct wpabuf *buf;
595 : struct eap_tlv_result_tlv *result;
596 : struct eap_tlv_crypto_binding_tlv *binding;
597 :
598 2 : buf = wpabuf_alloc(2 * sizeof(*result) + sizeof(*binding));
599 2 : if (buf == NULL)
600 0 : return NULL;
601 :
602 4 : if (data->send_new_pac || data->anon_provisioning ||
603 2 : data->phase2_method)
604 1 : data->final_result = 0;
605 : else
606 1 : data->final_result = 1;
607 :
608 2 : if (!data->final_result || data->eap_seq > 1) {
609 : /* Intermediate-Result */
610 2 : wpa_printf(MSG_DEBUG, "EAP-FAST: Add Intermediate-Result TLV "
611 : "(status=SUCCESS)");
612 2 : result = wpabuf_put(buf, sizeof(*result));
613 2 : result->tlv_type = host_to_be16(
614 : EAP_TLV_TYPE_MANDATORY |
615 : EAP_TLV_INTERMEDIATE_RESULT_TLV);
616 2 : result->length = host_to_be16(2);
617 2 : result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
618 : }
619 :
620 2 : if (data->final_result) {
621 : /* Result TLV */
622 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV "
623 : "(status=SUCCESS)");
624 1 : result = wpabuf_put(buf, sizeof(*result));
625 1 : result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
626 : EAP_TLV_RESULT_TLV);
627 1 : result->length = host_to_be16(2);
628 1 : result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
629 : }
630 :
631 : /* Crypto-Binding TLV */
632 2 : binding = wpabuf_put(buf, sizeof(*binding));
633 2 : binding->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
634 : EAP_TLV_CRYPTO_BINDING_TLV);
635 2 : binding->length = host_to_be16(sizeof(*binding) -
636 : sizeof(struct eap_tlv_hdr));
637 2 : binding->version = EAP_FAST_VERSION;
638 2 : binding->received_version = data->peer_version;
639 2 : binding->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST;
640 2 : if (random_get_bytes(binding->nonce, sizeof(binding->nonce)) < 0) {
641 0 : wpabuf_free(buf);
642 0 : return NULL;
643 : }
644 :
645 : /*
646 : * RFC 4851, Section 4.2.8:
647 : * The nonce in a request MUST have its least significant bit set to 0.
648 : */
649 2 : binding->nonce[sizeof(binding->nonce) - 1] &= ~0x01;
650 :
651 2 : os_memcpy(data->crypto_binding_nonce, binding->nonce,
652 : sizeof(binding->nonce));
653 :
654 : /*
655 : * RFC 4851, Section 5.3:
656 : * CMK = CMK[j]
657 : * Compound-MAC = HMAC-SHA1( CMK, Crypto-Binding TLV )
658 : */
659 :
660 2 : hmac_sha1(data->cmk, EAP_FAST_CMK_LEN,
661 : (u8 *) binding, sizeof(*binding),
662 2 : binding->compound_mac);
663 :
664 6 : wpa_printf(MSG_DEBUG, "EAP-FAST: Add Crypto-Binding TLV: Version %d "
665 : "Received Version %d SubType %d",
666 4 : binding->version, binding->received_version,
667 2 : binding->subtype);
668 2 : wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
669 2 : binding->nonce, sizeof(binding->nonce));
670 2 : wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
671 2 : binding->compound_mac, sizeof(binding->compound_mac));
672 :
673 2 : return buf;
674 : }
675 :
676 :
677 1 : static struct wpabuf * eap_fast_build_pac(struct eap_sm *sm,
678 : struct eap_fast_data *data)
679 : {
680 : u8 pac_key[EAP_FAST_PAC_KEY_LEN];
681 : u8 *pac_buf, *pac_opaque;
682 : struct wpabuf *buf;
683 : u8 *pos;
684 : size_t buf_len, srv_id_info_len, pac_len;
685 : struct eap_tlv_hdr *pac_tlv;
686 : struct pac_tlv_hdr *pac_info;
687 : struct eap_tlv_result_tlv *result;
688 : struct os_time now;
689 :
690 2 : if (random_get_bytes(pac_key, EAP_FAST_PAC_KEY_LEN) < 0 ||
691 1 : os_get_time(&now) < 0)
692 0 : return NULL;
693 1 : wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Generated PAC-Key",
694 : pac_key, EAP_FAST_PAC_KEY_LEN);
695 :
696 1 : pac_len = (2 + EAP_FAST_PAC_KEY_LEN) + (2 + 4) +
697 1 : (2 + sm->identity_len) + 8;
698 1 : pac_buf = os_malloc(pac_len);
699 1 : if (pac_buf == NULL)
700 0 : return NULL;
701 :
702 1 : srv_id_info_len = os_strlen(data->srv_id_info);
703 :
704 1 : pos = pac_buf;
705 1 : *pos++ = PAC_OPAQUE_TYPE_KEY;
706 1 : *pos++ = EAP_FAST_PAC_KEY_LEN;
707 1 : os_memcpy(pos, pac_key, EAP_FAST_PAC_KEY_LEN);
708 1 : pos += EAP_FAST_PAC_KEY_LEN;
709 :
710 1 : *pos++ = PAC_OPAQUE_TYPE_LIFETIME;
711 1 : *pos++ = 4;
712 1 : WPA_PUT_BE32(pos, now.sec + data->pac_key_lifetime);
713 1 : pos += 4;
714 :
715 1 : if (sm->identity) {
716 1 : *pos++ = PAC_OPAQUE_TYPE_IDENTITY;
717 1 : *pos++ = sm->identity_len;
718 1 : os_memcpy(pos, sm->identity, sm->identity_len);
719 1 : pos += sm->identity_len;
720 : }
721 :
722 1 : pac_len = pos - pac_buf;
723 4 : while (pac_len % 8) {
724 2 : *pos++ = PAC_OPAQUE_TYPE_PAD;
725 2 : pac_len++;
726 : }
727 :
728 1 : pac_opaque = os_malloc(pac_len + 8);
729 1 : if (pac_opaque == NULL) {
730 0 : os_free(pac_buf);
731 0 : return NULL;
732 : }
733 1 : if (aes_wrap(data->pac_opaque_encr, pac_len / 8, pac_buf,
734 : pac_opaque) < 0) {
735 0 : os_free(pac_buf);
736 0 : os_free(pac_opaque);
737 0 : return NULL;
738 : }
739 1 : os_free(pac_buf);
740 :
741 1 : pac_len += 8;
742 1 : wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque",
743 : pac_opaque, pac_len);
744 :
745 1 : buf_len = sizeof(*pac_tlv) +
746 : sizeof(struct pac_tlv_hdr) + EAP_FAST_PAC_KEY_LEN +
747 1 : sizeof(struct pac_tlv_hdr) + pac_len +
748 2 : data->srv_id_len + srv_id_info_len + 100 + sizeof(*result);
749 1 : buf = wpabuf_alloc(buf_len);
750 1 : if (buf == NULL) {
751 0 : os_free(pac_opaque);
752 0 : return NULL;
753 : }
754 :
755 : /* Result TLV */
756 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV (status=SUCCESS)");
757 1 : result = wpabuf_put(buf, sizeof(*result));
758 1 : WPA_PUT_BE16((u8 *) &result->tlv_type,
759 : EAP_TLV_TYPE_MANDATORY | EAP_TLV_RESULT_TLV);
760 1 : WPA_PUT_BE16((u8 *) &result->length, 2);
761 1 : WPA_PUT_BE16((u8 *) &result->status, EAP_TLV_RESULT_SUCCESS);
762 :
763 : /* PAC TLV */
764 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV");
765 1 : pac_tlv = wpabuf_put(buf, sizeof(*pac_tlv));
766 1 : pac_tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
767 : EAP_TLV_PAC_TLV);
768 :
769 : /* PAC-Key */
770 1 : eap_fast_put_tlv(buf, PAC_TYPE_PAC_KEY, pac_key, EAP_FAST_PAC_KEY_LEN);
771 :
772 : /* PAC-Opaque */
773 1 : eap_fast_put_tlv(buf, PAC_TYPE_PAC_OPAQUE, pac_opaque, pac_len);
774 1 : os_free(pac_opaque);
775 :
776 : /* PAC-Info */
777 1 : pac_info = wpabuf_put(buf, sizeof(*pac_info));
778 1 : pac_info->type = host_to_be16(PAC_TYPE_PAC_INFO);
779 :
780 : /* PAC-Lifetime (inside PAC-Info) */
781 1 : eap_fast_put_tlv_hdr(buf, PAC_TYPE_CRED_LIFETIME, 4);
782 1 : wpabuf_put_be32(buf, now.sec + data->pac_key_lifetime);
783 :
784 : /* A-ID (inside PAC-Info) */
785 1 : eap_fast_put_tlv(buf, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
786 :
787 : /* Note: headers may be misaligned after A-ID */
788 :
789 1 : if (sm->identity) {
790 1 : eap_fast_put_tlv(buf, PAC_TYPE_I_ID, sm->identity,
791 1 : sm->identity_len);
792 : }
793 :
794 : /* A-ID-Info (inside PAC-Info) */
795 1 : eap_fast_put_tlv(buf, PAC_TYPE_A_ID_INFO, data->srv_id_info,
796 : srv_id_info_len);
797 :
798 : /* PAC-Type (inside PAC-Info) */
799 1 : eap_fast_put_tlv_hdr(buf, PAC_TYPE_PAC_TYPE, 2);
800 1 : wpabuf_put_be16(buf, PAC_TYPE_TUNNEL_PAC);
801 :
802 : /* Update PAC-Info and PAC TLV Length fields */
803 1 : pos = wpabuf_put(buf, 0);
804 1 : pac_info->len = host_to_be16(pos - (u8 *) (pac_info + 1));
805 1 : pac_tlv->length = host_to_be16(pos - (u8 *) (pac_tlv + 1));
806 :
807 1 : return buf;
808 : }
809 :
810 :
811 8 : static int eap_fast_encrypt_phase2(struct eap_sm *sm,
812 : struct eap_fast_data *data,
813 : struct wpabuf *plain, int piggyback)
814 : {
815 : struct wpabuf *encr;
816 :
817 8 : wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 TLVs",
818 : plain);
819 8 : encr = eap_server_tls_encrypt(sm, &data->ssl, plain);
820 8 : wpabuf_free(plain);
821 :
822 8 : if (data->ssl.tls_out && piggyback) {
823 3 : wpa_printf(MSG_DEBUG, "EAP-FAST: Piggyback Phase 2 data "
824 : "(len=%d) with last Phase 1 Message (len=%d "
825 : "used=%d)",
826 1 : (int) wpabuf_len(encr),
827 1 : (int) wpabuf_len(data->ssl.tls_out),
828 1 : (int) data->ssl.tls_out_pos);
829 1 : if (wpabuf_resize(&data->ssl.tls_out, wpabuf_len(encr)) < 0) {
830 0 : wpa_printf(MSG_WARNING, "EAP-FAST: Failed to resize "
831 : "output buffer");
832 0 : wpabuf_free(encr);
833 0 : return -1;
834 : }
835 1 : wpabuf_put_buf(data->ssl.tls_out, encr);
836 1 : wpabuf_free(encr);
837 : } else {
838 7 : wpabuf_free(data->ssl.tls_out);
839 7 : data->ssl.tls_out_pos = 0;
840 7 : data->ssl.tls_out = encr;
841 : }
842 :
843 8 : return 0;
844 : }
845 :
846 :
847 10 : static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id)
848 : {
849 10 : struct eap_fast_data *data = priv;
850 10 : struct wpabuf *req = NULL;
851 10 : int piggyback = 0;
852 :
853 10 : if (data->ssl.state == FRAG_ACK) {
854 0 : return eap_server_tls_build_ack(id, EAP_TYPE_FAST,
855 : data->fast_version);
856 : }
857 :
858 10 : if (data->ssl.state == WAIT_FRAG_ACK) {
859 0 : return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
860 : data->fast_version, id);
861 : }
862 :
863 10 : switch (data->state) {
864 : case START:
865 1 : return eap_fast_build_start(sm, data, id);
866 : case PHASE1:
867 2 : if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
868 1 : if (eap_fast_phase1_done(sm, data) < 0)
869 0 : return NULL;
870 1 : if (data->state == PHASE2_START) {
871 : /*
872 : * Try to generate Phase 2 data to piggyback
873 : * with the end of Phase 1 to avoid extra
874 : * roundtrip.
875 : */
876 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: Try to start "
877 : "Phase 2");
878 1 : if (eap_fast_process_phase2_start(sm, data))
879 0 : break;
880 1 : req = eap_fast_build_phase2_req(sm, data, id);
881 1 : piggyback = 1;
882 : }
883 : }
884 2 : break;
885 : case PHASE2_ID:
886 : case PHASE2_METHOD:
887 4 : req = eap_fast_build_phase2_req(sm, data, id);
888 4 : break;
889 : case CRYPTO_BINDING:
890 2 : req = eap_fast_build_crypto_binding(sm, data);
891 2 : if (data->phase2_method) {
892 : /*
893 : * Include the start of the next EAP method in the
894 : * sequence in the same message with Crypto-Binding to
895 : * save a round-trip.
896 : */
897 : struct wpabuf *eap;
898 1 : eap = eap_fast_build_phase2_req(sm, data, id);
899 1 : req = wpabuf_concat(req, eap);
900 1 : eap_fast_state(data, PHASE2_METHOD);
901 : }
902 2 : break;
903 : case REQUEST_PAC:
904 1 : req = eap_fast_build_pac(sm, data);
905 1 : break;
906 : default:
907 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
908 0 : __func__, data->state);
909 0 : return NULL;
910 : }
911 :
912 17 : if (req &&
913 8 : eap_fast_encrypt_phase2(sm, data, req, piggyback) < 0)
914 0 : return NULL;
915 :
916 9 : return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
917 : data->fast_version, id);
918 : }
919 :
920 :
921 10 : static Boolean eap_fast_check(struct eap_sm *sm, void *priv,
922 : struct wpabuf *respData)
923 : {
924 : const u8 *pos;
925 : size_t len;
926 :
927 10 : pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_FAST, respData, &len);
928 10 : if (pos == NULL || len < 1) {
929 0 : wpa_printf(MSG_INFO, "EAP-FAST: Invalid frame");
930 0 : return TRUE;
931 : }
932 :
933 10 : return FALSE;
934 : }
935 :
936 :
937 5 : static int eap_fast_phase2_init(struct eap_sm *sm, struct eap_fast_data *data,
938 : EapType eap_type)
939 : {
940 5 : if (data->phase2_priv && data->phase2_method) {
941 4 : data->phase2_method->reset(sm, data->phase2_priv);
942 4 : data->phase2_method = NULL;
943 4 : data->phase2_priv = NULL;
944 : }
945 5 : data->phase2_method = eap_server_get_eap_method(EAP_VENDOR_IETF,
946 : eap_type);
947 5 : if (!data->phase2_method)
948 1 : return -1;
949 :
950 4 : if (data->key_block_p) {
951 0 : sm->auth_challenge = data->key_block_p->server_challenge;
952 0 : sm->peer_challenge = data->key_block_p->client_challenge;
953 : }
954 4 : sm->init_phase2 = 1;
955 4 : data->phase2_priv = data->phase2_method->init(sm);
956 4 : sm->init_phase2 = 0;
957 4 : sm->auth_challenge = NULL;
958 4 : sm->peer_challenge = NULL;
959 :
960 4 : return data->phase2_priv == NULL ? -1 : 0;
961 : }
962 :
963 :
964 6 : static void eap_fast_process_phase2_response(struct eap_sm *sm,
965 : struct eap_fast_data *data,
966 : u8 *in_data, size_t in_len)
967 : {
968 6 : u8 next_type = EAP_TYPE_NONE;
969 : struct eap_hdr *hdr;
970 : u8 *pos;
971 : size_t left;
972 : struct wpabuf buf;
973 6 : const struct eap_method *m = data->phase2_method;
974 6 : void *priv = data->phase2_priv;
975 :
976 6 : if (priv == NULL) {
977 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: %s - Phase2 not "
978 : "initialized?!", __func__);
979 0 : return;
980 : }
981 :
982 6 : hdr = (struct eap_hdr *) in_data;
983 6 : pos = (u8 *) (hdr + 1);
984 :
985 6 : if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
986 1 : left = in_len - sizeof(*hdr);
987 1 : wpa_hexdump(MSG_DEBUG, "EAP-FAST: Phase2 type Nak'ed; "
988 : "allowed types", pos + 1, left - 1);
989 : #ifdef EAP_SERVER_TNC
990 2 : if (m && m->vendor == EAP_VENDOR_IETF &&
991 1 : m->method == EAP_TYPE_TNC) {
992 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Peer Nak'ed required "
993 : "TNC negotiation");
994 0 : next_type = eap_fast_req_failure(sm, data);
995 0 : eap_fast_phase2_init(sm, data, next_type);
996 0 : return;
997 : }
998 : #endif /* EAP_SERVER_TNC */
999 1 : eap_sm_process_nak(sm, pos + 1, left - 1);
1000 2 : if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
1001 1 : sm->user->methods[sm->user_eap_method_index].method !=
1002 : EAP_TYPE_NONE) {
1003 2 : next_type = sm->user->methods[
1004 1 : sm->user_eap_method_index++].method;
1005 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d",
1006 : next_type);
1007 : } else {
1008 0 : next_type = eap_fast_req_failure(sm, data);
1009 : }
1010 1 : eap_fast_phase2_init(sm, data, next_type);
1011 1 : return;
1012 : }
1013 :
1014 5 : wpabuf_set(&buf, in_data, in_len);
1015 :
1016 5 : if (m->check(sm, priv, &buf)) {
1017 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 check() asked to "
1018 : "ignore the packet");
1019 0 : next_type = eap_fast_req_failure(sm, data);
1020 0 : return;
1021 : }
1022 :
1023 5 : m->process(sm, priv, &buf);
1024 :
1025 5 : if (!m->isDone(sm, priv))
1026 2 : return;
1027 :
1028 3 : if (!m->isSuccess(sm, priv)) {
1029 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method failed");
1030 0 : next_type = eap_fast_req_failure(sm, data);
1031 0 : eap_fast_phase2_init(sm, data, next_type);
1032 0 : return;
1033 : }
1034 :
1035 3 : switch (data->state) {
1036 : case PHASE2_ID:
1037 1 : if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1038 0 : wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Phase2 "
1039 : "Identity not found in the user "
1040 : "database",
1041 0 : sm->identity, sm->identity_len);
1042 0 : next_type = eap_fast_req_failure(sm, data);
1043 0 : break;
1044 : }
1045 :
1046 1 : eap_fast_state(data, PHASE2_METHOD);
1047 1 : if (data->anon_provisioning) {
1048 : /*
1049 : * Only EAP-MSCHAPv2 is allowed for anonymous
1050 : * provisioning.
1051 : */
1052 0 : next_type = EAP_TYPE_MSCHAPV2;
1053 0 : sm->user_eap_method_index = 0;
1054 : } else {
1055 1 : next_type = sm->user->methods[0].method;
1056 1 : sm->user_eap_method_index = 1;
1057 : }
1058 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d", next_type);
1059 1 : break;
1060 : case PHASE2_METHOD:
1061 : case CRYPTO_BINDING:
1062 2 : eap_fast_update_icmk(sm, data);
1063 2 : eap_fast_state(data, CRYPTO_BINDING);
1064 2 : data->eap_seq++;
1065 2 : next_type = EAP_TYPE_NONE;
1066 : #ifdef EAP_SERVER_TNC
1067 2 : if (sm->tnc && !data->tnc_started) {
1068 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: Initialize TNC");
1069 1 : next_type = EAP_TYPE_TNC;
1070 1 : data->tnc_started = 1;
1071 : }
1072 : #endif /* EAP_SERVER_TNC */
1073 2 : break;
1074 : case FAILURE:
1075 0 : break;
1076 : default:
1077 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
1078 0 : __func__, data->state);
1079 0 : break;
1080 : }
1081 :
1082 3 : eap_fast_phase2_init(sm, data, next_type);
1083 : }
1084 :
1085 :
1086 6 : static void eap_fast_process_phase2_eap(struct eap_sm *sm,
1087 : struct eap_fast_data *data,
1088 : u8 *in_data, size_t in_len)
1089 : {
1090 : struct eap_hdr *hdr;
1091 : size_t len;
1092 :
1093 6 : hdr = (struct eap_hdr *) in_data;
1094 6 : if (in_len < (int) sizeof(*hdr)) {
1095 0 : wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1096 : "EAP frame (len=%lu)", (unsigned long) in_len);
1097 0 : eap_fast_req_failure(sm, data);
1098 0 : return;
1099 : }
1100 6 : len = be_to_host16(hdr->length);
1101 6 : if (len > in_len) {
1102 0 : wpa_printf(MSG_INFO, "EAP-FAST: Length mismatch in "
1103 : "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
1104 : (unsigned long) in_len, (unsigned long) len);
1105 0 : eap_fast_req_failure(sm, data);
1106 0 : return;
1107 : }
1108 12 : wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: code=%d "
1109 12 : "identifier=%d length=%lu", hdr->code, hdr->identifier,
1110 : (unsigned long) len);
1111 6 : switch (hdr->code) {
1112 : case EAP_CODE_RESPONSE:
1113 6 : eap_fast_process_phase2_response(sm, data, (u8 *) hdr, len);
1114 6 : break;
1115 : default:
1116 0 : wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
1117 0 : "Phase 2 EAP header", hdr->code);
1118 0 : break;
1119 : }
1120 : }
1121 :
1122 :
1123 8 : static int eap_fast_parse_tlvs(struct wpabuf *data,
1124 : struct eap_fast_tlv_parse *tlv)
1125 : {
1126 : int mandatory, tlv_type, len, res;
1127 : u8 *pos, *end;
1128 :
1129 8 : os_memset(tlv, 0, sizeof(*tlv));
1130 :
1131 8 : pos = wpabuf_mhead(data);
1132 8 : end = pos + wpabuf_len(data);
1133 33 : while (pos + 4 < end) {
1134 17 : mandatory = pos[0] & 0x80;
1135 17 : tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1136 17 : pos += 2;
1137 17 : len = WPA_GET_BE16(pos);
1138 17 : pos += 2;
1139 17 : if (pos + len > end) {
1140 0 : wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1141 0 : return -1;
1142 : }
1143 17 : wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1144 : "TLV type %d length %d%s",
1145 : tlv_type, len, mandatory ? " (mandatory)" : "");
1146 :
1147 17 : res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1148 17 : if (res == -2)
1149 0 : break;
1150 17 : if (res < 0) {
1151 0 : if (mandatory) {
1152 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1153 : "mandatory TLV type %d", tlv_type);
1154 : /* TODO: generate Nak TLV */
1155 0 : break;
1156 : } else {
1157 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored "
1158 : "unknown optional TLV type %d",
1159 : tlv_type);
1160 : }
1161 : }
1162 :
1163 17 : pos += len;
1164 : }
1165 :
1166 8 : return 0;
1167 : }
1168 :
1169 :
1170 1 : static int eap_fast_validate_crypto_binding(
1171 : struct eap_fast_data *data, struct eap_tlv_crypto_binding_tlv *b,
1172 : size_t bind_len)
1173 : {
1174 : u8 cmac[SHA1_MAC_LEN];
1175 :
1176 3 : wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: "
1177 : "Version %d Received Version %d SubType %d",
1178 3 : b->version, b->received_version, b->subtype);
1179 1 : wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
1180 1 : b->nonce, sizeof(b->nonce));
1181 1 : wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
1182 1 : b->compound_mac, sizeof(b->compound_mac));
1183 :
1184 2 : if (b->version != EAP_FAST_VERSION ||
1185 1 : b->received_version != EAP_FAST_VERSION) {
1186 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected version "
1187 : "in Crypto-Binding: version %d "
1188 0 : "received_version %d", b->version,
1189 0 : b->received_version);
1190 0 : return -1;
1191 : }
1192 :
1193 1 : if (b->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE) {
1194 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected subtype in "
1195 0 : "Crypto-Binding: %d", b->subtype);
1196 0 : return -1;
1197 : }
1198 :
1199 2 : if (os_memcmp(data->crypto_binding_nonce, b->nonce, 31) != 0 ||
1200 1 : (data->crypto_binding_nonce[31] | 1) != b->nonce[31]) {
1201 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid nonce in "
1202 : "Crypto-Binding");
1203 0 : return -1;
1204 : }
1205 :
1206 1 : os_memcpy(cmac, b->compound_mac, sizeof(cmac));
1207 1 : os_memset(b->compound_mac, 0, sizeof(cmac));
1208 1 : wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for "
1209 : "Compound MAC calculation",
1210 : (u8 *) b, bind_len);
1211 1 : hmac_sha1(data->cmk, EAP_FAST_CMK_LEN, (u8 *) b, bind_len,
1212 1 : b->compound_mac);
1213 1 : if (os_memcmp(cmac, b->compound_mac, sizeof(cmac)) != 0) {
1214 0 : wpa_hexdump(MSG_MSGDUMP,
1215 : "EAP-FAST: Calculated Compound MAC",
1216 0 : b->compound_mac, sizeof(cmac));
1217 0 : wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not "
1218 : "match");
1219 0 : return -1;
1220 : }
1221 :
1222 1 : return 0;
1223 : }
1224 :
1225 :
1226 1 : static int eap_fast_pac_type(u8 *pac, size_t len, u16 type)
1227 : {
1228 : struct eap_tlv_pac_type_tlv *tlv;
1229 :
1230 1 : if (pac == NULL || len != sizeof(*tlv))
1231 0 : return 0;
1232 :
1233 1 : tlv = (struct eap_tlv_pac_type_tlv *) pac;
1234 :
1235 3 : return be_to_host16(tlv->tlv_type) == PAC_TYPE_PAC_TYPE &&
1236 2 : be_to_host16(tlv->length) == 2 &&
1237 1 : be_to_host16(tlv->pac_type) == type;
1238 : }
1239 :
1240 :
1241 8 : static void eap_fast_process_phase2_tlvs(struct eap_sm *sm,
1242 : struct eap_fast_data *data,
1243 : struct wpabuf *in_data)
1244 : {
1245 : struct eap_fast_tlv_parse tlv;
1246 8 : int check_crypto_binding = data->state == CRYPTO_BINDING;
1247 :
1248 8 : if (eap_fast_parse_tlvs(in_data, &tlv) < 0) {
1249 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to parse received "
1250 : "Phase 2 TLVs");
1251 0 : return;
1252 : }
1253 :
1254 8 : if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1255 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Result TLV indicated "
1256 : "failure");
1257 0 : eap_fast_state(data, FAILURE);
1258 0 : return;
1259 : }
1260 :
1261 8 : if (data->state == REQUEST_PAC) {
1262 : u16 type, len, res;
1263 1 : if (tlv.pac == NULL || tlv.pac_len < 6) {
1264 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC "
1265 : "Acknowledgement received");
1266 0 : eap_fast_state(data, FAILURE);
1267 0 : return;
1268 : }
1269 :
1270 1 : type = WPA_GET_BE16(tlv.pac);
1271 1 : len = WPA_GET_BE16(tlv.pac + 2);
1272 1 : res = WPA_GET_BE16(tlv.pac + 4);
1273 :
1274 1 : if (type != PAC_TYPE_PAC_ACKNOWLEDGEMENT || len != 2 ||
1275 : res != EAP_TLV_RESULT_SUCCESS) {
1276 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV did not "
1277 : "contain acknowledgement");
1278 0 : eap_fast_state(data, FAILURE);
1279 0 : return;
1280 : }
1281 :
1282 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Acknowledgement received "
1283 : "- PAC provisioning succeeded");
1284 2 : eap_fast_state(data, (data->anon_provisioning ||
1285 1 : data->send_new_pac == 2) ?
1286 : FAILURE : SUCCESS);
1287 1 : return;
1288 : }
1289 :
1290 7 : if (check_crypto_binding) {
1291 1 : if (tlv.crypto_binding == NULL) {
1292 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: No Crypto-Binding "
1293 : "TLV received");
1294 0 : eap_fast_state(data, FAILURE);
1295 0 : return;
1296 : }
1297 :
1298 2 : if (data->final_result &&
1299 1 : tlv.result != EAP_TLV_RESULT_SUCCESS) {
1300 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1301 : "without Success Result");
1302 0 : eap_fast_state(data, FAILURE);
1303 0 : return;
1304 : }
1305 :
1306 1 : if (!data->final_result &&
1307 0 : tlv.iresult != EAP_TLV_RESULT_SUCCESS) {
1308 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1309 : "without intermediate Success Result");
1310 0 : eap_fast_state(data, FAILURE);
1311 0 : return;
1312 : }
1313 :
1314 1 : if (eap_fast_validate_crypto_binding(data, tlv.crypto_binding,
1315 : tlv.crypto_binding_len)) {
1316 0 : eap_fast_state(data, FAILURE);
1317 0 : return;
1318 : }
1319 :
1320 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: Valid Crypto-Binding TLV "
1321 : "received");
1322 1 : if (data->final_result) {
1323 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1324 : "completed successfully");
1325 : }
1326 :
1327 1 : if (data->anon_provisioning &&
1328 0 : sm->eap_fast_prov != ANON_PROV &&
1329 0 : sm->eap_fast_prov != BOTH_PROV) {
1330 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1331 : "use unauthenticated provisioning which is "
1332 : "disabled");
1333 0 : eap_fast_state(data, FAILURE);
1334 0 : return;
1335 : }
1336 :
1337 2 : if (sm->eap_fast_prov != AUTH_PROV &&
1338 1 : sm->eap_fast_prov != BOTH_PROV &&
1339 0 : tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1340 0 : eap_fast_pac_type(tlv.pac, tlv.pac_len,
1341 : PAC_TYPE_TUNNEL_PAC)) {
1342 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1343 : "use authenticated provisioning which is "
1344 : "disabled");
1345 0 : eap_fast_state(data, FAILURE);
1346 0 : return;
1347 : }
1348 :
1349 2 : if (data->anon_provisioning ||
1350 2 : (tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1351 1 : eap_fast_pac_type(tlv.pac, tlv.pac_len,
1352 : PAC_TYPE_TUNNEL_PAC))) {
1353 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: Requested a new "
1354 : "Tunnel PAC");
1355 1 : eap_fast_state(data, REQUEST_PAC);
1356 0 : } else if (data->send_new_pac) {
1357 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Server triggered "
1358 : "re-keying of Tunnel PAC");
1359 0 : eap_fast_state(data, REQUEST_PAC);
1360 0 : } else if (data->final_result)
1361 0 : eap_fast_state(data, SUCCESS);
1362 : }
1363 :
1364 7 : if (tlv.eap_payload_tlv) {
1365 6 : eap_fast_process_phase2_eap(sm, data, tlv.eap_payload_tlv,
1366 : tlv.eap_payload_tlv_len);
1367 : }
1368 : }
1369 :
1370 :
1371 8 : static void eap_fast_process_phase2(struct eap_sm *sm,
1372 : struct eap_fast_data *data,
1373 : struct wpabuf *in_buf)
1374 : {
1375 : struct wpabuf *in_decrypted;
1376 :
1377 8 : wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1378 : " Phase 2", (unsigned long) wpabuf_len(in_buf));
1379 :
1380 8 : if (data->pending_phase2_resp) {
1381 0 : wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
1382 : "skip decryption and use old data");
1383 0 : eap_fast_process_phase2_tlvs(sm, data,
1384 : data->pending_phase2_resp);
1385 0 : wpabuf_free(data->pending_phase2_resp);
1386 0 : data->pending_phase2_resp = NULL;
1387 0 : return;
1388 : }
1389 :
1390 8 : in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
1391 : in_buf);
1392 8 : if (in_decrypted == NULL) {
1393 0 : wpa_printf(MSG_INFO, "EAP-FAST: Failed to decrypt Phase 2 "
1394 : "data");
1395 0 : eap_fast_state(data, FAILURE);
1396 0 : return;
1397 : }
1398 :
1399 8 : wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Decrypted Phase 2 TLVs",
1400 : in_decrypted);
1401 :
1402 8 : eap_fast_process_phase2_tlvs(sm, data, in_decrypted);
1403 :
1404 8 : if (sm->method_pending == METHOD_PENDING_WAIT) {
1405 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method is in "
1406 : "pending wait state - save decrypted response");
1407 0 : wpabuf_free(data->pending_phase2_resp);
1408 0 : data->pending_phase2_resp = in_decrypted;
1409 0 : return;
1410 : }
1411 :
1412 8 : wpabuf_free(in_decrypted);
1413 : }
1414 :
1415 :
1416 10 : static int eap_fast_process_version(struct eap_sm *sm, void *priv,
1417 : int peer_version)
1418 : {
1419 10 : struct eap_fast_data *data = priv;
1420 :
1421 10 : data->peer_version = peer_version;
1422 :
1423 10 : if (data->force_version >= 0 && peer_version != data->force_version) {
1424 0 : wpa_printf(MSG_INFO, "EAP-FAST: peer did not select the forced"
1425 : " version (forced=%d peer=%d) - reject",
1426 : data->force_version, peer_version);
1427 0 : return -1;
1428 : }
1429 :
1430 10 : if (peer_version < data->fast_version) {
1431 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: peer ver=%d, own ver=%d; "
1432 : "use version %d",
1433 : peer_version, data->fast_version, peer_version);
1434 0 : data->fast_version = peer_version;
1435 : }
1436 :
1437 10 : return 0;
1438 : }
1439 :
1440 :
1441 2 : static int eap_fast_process_phase1(struct eap_sm *sm,
1442 : struct eap_fast_data *data)
1443 : {
1444 2 : if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
1445 0 : wpa_printf(MSG_INFO, "EAP-FAST: TLS processing failed");
1446 0 : eap_fast_state(data, FAILURE);
1447 0 : return -1;
1448 : }
1449 :
1450 3 : if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
1451 1 : wpabuf_len(data->ssl.tls_out) > 0)
1452 2 : return 1;
1453 :
1454 : /*
1455 : * Phase 1 was completed with the received message (e.g., when using
1456 : * abbreviated handshake), so Phase 2 can be started immediately
1457 : * without having to send through an empty message to the peer.
1458 : */
1459 :
1460 0 : return eap_fast_phase1_done(sm, data);
1461 : }
1462 :
1463 :
1464 1 : static int eap_fast_process_phase2_start(struct eap_sm *sm,
1465 : struct eap_fast_data *data)
1466 : {
1467 : u8 next_type;
1468 :
1469 1 : if (data->identity) {
1470 0 : os_free(sm->identity);
1471 0 : sm->identity = data->identity;
1472 0 : data->identity = NULL;
1473 0 : sm->identity_len = data->identity_len;
1474 0 : data->identity_len = 0;
1475 0 : sm->require_identity_match = 1;
1476 0 : if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1477 0 : wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: "
1478 : "Phase2 Identity not found "
1479 : "in the user database",
1480 0 : sm->identity, sm->identity_len);
1481 0 : next_type = eap_fast_req_failure(sm, data);
1482 : } else {
1483 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Identity already "
1484 : "known - skip Phase 2 Identity Request");
1485 0 : next_type = sm->user->methods[0].method;
1486 0 : sm->user_eap_method_index = 1;
1487 : }
1488 :
1489 0 : eap_fast_state(data, PHASE2_METHOD);
1490 : } else {
1491 1 : eap_fast_state(data, PHASE2_ID);
1492 1 : next_type = EAP_TYPE_IDENTITY;
1493 : }
1494 :
1495 1 : return eap_fast_phase2_init(sm, data, next_type);
1496 : }
1497 :
1498 :
1499 10 : static void eap_fast_process_msg(struct eap_sm *sm, void *priv,
1500 : const struct wpabuf *respData)
1501 : {
1502 10 : struct eap_fast_data *data = priv;
1503 :
1504 10 : switch (data->state) {
1505 : case PHASE1:
1506 2 : if (eap_fast_process_phase1(sm, data))
1507 2 : break;
1508 :
1509 : /* fall through to PHASE2_START */
1510 : case PHASE2_START:
1511 0 : eap_fast_process_phase2_start(sm, data);
1512 0 : break;
1513 : case PHASE2_ID:
1514 : case PHASE2_METHOD:
1515 : case CRYPTO_BINDING:
1516 : case REQUEST_PAC:
1517 8 : eap_fast_process_phase2(sm, data, data->ssl.tls_in);
1518 8 : break;
1519 : default:
1520 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected state %d in %s",
1521 0 : data->state, __func__);
1522 0 : break;
1523 : }
1524 10 : }
1525 :
1526 :
1527 10 : static void eap_fast_process(struct eap_sm *sm, void *priv,
1528 : struct wpabuf *respData)
1529 : {
1530 10 : struct eap_fast_data *data = priv;
1531 10 : if (eap_server_tls_process(sm, &data->ssl, respData, data,
1532 : EAP_TYPE_FAST, eap_fast_process_version,
1533 : eap_fast_process_msg) < 0)
1534 0 : eap_fast_state(data, FAILURE);
1535 10 : }
1536 :
1537 :
1538 10 : static Boolean eap_fast_isDone(struct eap_sm *sm, void *priv)
1539 : {
1540 10 : struct eap_fast_data *data = priv;
1541 10 : return data->state == SUCCESS || data->state == FAILURE;
1542 : }
1543 :
1544 :
1545 1 : static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1546 : {
1547 1 : struct eap_fast_data *data = priv;
1548 : u8 *eapKeyData;
1549 :
1550 1 : if (data->state != SUCCESS)
1551 0 : return NULL;
1552 :
1553 1 : eapKeyData = os_malloc(EAP_FAST_KEY_LEN);
1554 1 : if (eapKeyData == NULL)
1555 0 : return NULL;
1556 :
1557 1 : eap_fast_derive_eap_msk(data->simck, eapKeyData);
1558 1 : *len = EAP_FAST_KEY_LEN;
1559 :
1560 1 : return eapKeyData;
1561 : }
1562 :
1563 :
1564 0 : static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1565 : {
1566 0 : struct eap_fast_data *data = priv;
1567 : u8 *eapKeyData;
1568 :
1569 0 : if (data->state != SUCCESS)
1570 0 : return NULL;
1571 :
1572 0 : eapKeyData = os_malloc(EAP_EMSK_LEN);
1573 0 : if (eapKeyData == NULL)
1574 0 : return NULL;
1575 :
1576 0 : eap_fast_derive_eap_emsk(data->simck, eapKeyData);
1577 0 : *len = EAP_EMSK_LEN;
1578 :
1579 0 : return eapKeyData;
1580 : }
1581 :
1582 :
1583 1 : static Boolean eap_fast_isSuccess(struct eap_sm *sm, void *priv)
1584 : {
1585 1 : struct eap_fast_data *data = priv;
1586 1 : return data->state == SUCCESS;
1587 : }
1588 :
1589 :
1590 1 : int eap_server_fast_register(void)
1591 : {
1592 : struct eap_method *eap;
1593 : int ret;
1594 :
1595 1 : eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
1596 : EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1597 1 : if (eap == NULL)
1598 0 : return -1;
1599 :
1600 1 : eap->init = eap_fast_init;
1601 1 : eap->reset = eap_fast_reset;
1602 1 : eap->buildReq = eap_fast_buildReq;
1603 1 : eap->check = eap_fast_check;
1604 1 : eap->process = eap_fast_process;
1605 1 : eap->isDone = eap_fast_isDone;
1606 1 : eap->getKey = eap_fast_getKey;
1607 1 : eap->get_emsk = eap_fast_get_emsk;
1608 1 : eap->isSuccess = eap_fast_isSuccess;
1609 :
1610 1 : ret = eap_server_method_register(eap);
1611 1 : if (ret)
1612 0 : eap_server_method_free(eap);
1613 1 : return ret;
1614 : }
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