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, sizeof(data->pac_opaque_encr),
165 0 : (pac_opaque_len - 8) / 8, 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 : goto done;
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 : done:
222 :
223 0 : if (pac_key == NULL) {
224 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC-Key included in "
225 : "PAC-Opaque");
226 0 : os_free(buf);
227 0 : return -1;
228 : }
229 :
230 0 : if (identity) {
231 0 : wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Identity from "
232 : "PAC-Opaque", identity, identity_len);
233 0 : os_free(data->identity);
234 0 : data->identity = os_malloc(identity_len);
235 0 : if (data->identity) {
236 0 : os_memcpy(data->identity, identity, identity_len);
237 0 : data->identity_len = identity_len;
238 : }
239 : }
240 :
241 0 : if (os_get_time(&now) < 0 || lifetime <= 0 || now.sec > lifetime) {
242 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key not valid anymore "
243 : "(lifetime=%ld now=%ld)", lifetime, now.sec);
244 0 : data->send_new_pac = 2;
245 : /*
246 : * Allow PAC to be used to allow a PAC update with some level
247 : * of server authentication (i.e., do not fall back to full TLS
248 : * handshake since we cannot be sure that the peer would be
249 : * able to validate server certificate now). However, reject
250 : * the authentication since the PAC was not valid anymore. Peer
251 : * can connect again with the newly provisioned PAC after this.
252 : */
253 0 : } else if (lifetime - now.sec < data->pac_key_refresh_time) {
254 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Key soft timeout; send "
255 : "an update if authentication succeeds");
256 0 : data->send_new_pac = 1;
257 : }
258 :
259 0 : eap_fast_derive_master_secret(pac_key, server_random, client_random,
260 : master_secret);
261 :
262 0 : os_free(buf);
263 :
264 0 : return 1;
265 : }
266 :
267 :
268 1 : static void eap_fast_derive_key_auth(struct eap_sm *sm,
269 : struct eap_fast_data *data)
270 : {
271 : u8 *sks;
272 :
273 : /* RFC 4851, Section 5.1:
274 : * Extra key material after TLS key_block: session_key_seed[40]
275 : */
276 :
277 1 : sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion",
278 : EAP_FAST_SKS_LEN);
279 1 : if (sks == NULL) {
280 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
281 : "session_key_seed");
282 1 : return;
283 : }
284 :
285 : /*
286 : * RFC 4851, Section 5.2:
287 : * S-IMCK[0] = session_key_seed
288 : */
289 1 : wpa_hexdump_key(MSG_DEBUG,
290 : "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
291 : sks, EAP_FAST_SKS_LEN);
292 1 : data->simck_idx = 0;
293 1 : os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
294 1 : os_free(sks);
295 : }
296 :
297 :
298 0 : static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
299 : struct eap_fast_data *data)
300 : {
301 0 : os_free(data->key_block_p);
302 0 : data->key_block_p = (struct eap_fast_key_block_provisioning *)
303 0 : eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
304 : "key expansion",
305 : sizeof(*data->key_block_p));
306 0 : if (data->key_block_p == NULL) {
307 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
308 0 : return;
309 : }
310 : /*
311 : * RFC 4851, Section 5.2:
312 : * S-IMCK[0] = session_key_seed
313 : */
314 0 : wpa_hexdump_key(MSG_DEBUG,
315 : "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
316 0 : data->key_block_p->session_key_seed,
317 : sizeof(data->key_block_p->session_key_seed));
318 0 : data->simck_idx = 0;
319 0 : os_memcpy(data->simck, data->key_block_p->session_key_seed,
320 : EAP_FAST_SIMCK_LEN);
321 0 : wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
322 0 : data->key_block_p->server_challenge,
323 : sizeof(data->key_block_p->server_challenge));
324 0 : wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
325 0 : data->key_block_p->client_challenge,
326 : sizeof(data->key_block_p->client_challenge));
327 : }
328 :
329 :
330 2 : static int eap_fast_get_phase2_key(struct eap_sm *sm,
331 : struct eap_fast_data *data,
332 : u8 *isk, size_t isk_len)
333 : {
334 : u8 *key;
335 : size_t key_len;
336 :
337 2 : os_memset(isk, 0, isk_len);
338 :
339 2 : if (data->phase2_method == NULL || data->phase2_priv == NULL) {
340 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
341 : "available");
342 0 : return -1;
343 : }
344 :
345 2 : if (data->phase2_method->getKey == NULL)
346 2 : return 0;
347 :
348 0 : if ((key = data->phase2_method->getKey(sm, data->phase2_priv,
349 : &key_len)) == NULL) {
350 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Could not get key material "
351 : "from Phase 2");
352 0 : return -1;
353 : }
354 :
355 0 : if (key_len > isk_len)
356 0 : key_len = isk_len;
357 0 : if (key_len == 32 &&
358 0 : data->phase2_method->vendor == EAP_VENDOR_IETF &&
359 0 : data->phase2_method->method == EAP_TYPE_MSCHAPV2) {
360 : /*
361 : * EAP-FAST uses reverse order for MS-MPPE keys when deriving
362 : * MSK from EAP-MSCHAPv2. Swap the keys here to get the correct
363 : * ISK for EAP-FAST cryptobinding.
364 : */
365 0 : os_memcpy(isk, key + 16, 16);
366 0 : os_memcpy(isk + 16, key, 16);
367 : } else
368 0 : os_memcpy(isk, key, key_len);
369 0 : os_free(key);
370 :
371 0 : return 0;
372 : }
373 :
374 :
375 2 : static int eap_fast_update_icmk(struct eap_sm *sm, struct eap_fast_data *data)
376 : {
377 : u8 isk[32], imck[60];
378 :
379 2 : wpa_printf(MSG_DEBUG, "EAP-FAST: Deriving ICMK[%d] (S-IMCK and CMK)",
380 2 : data->simck_idx + 1);
381 :
382 : /*
383 : * RFC 4851, Section 5.2:
384 : * IMCK[j] = T-PRF(S-IMCK[j-1], "Inner Methods Compound Keys",
385 : * MSK[j], 60)
386 : * S-IMCK[j] = first 40 octets of IMCK[j]
387 : * CMK[j] = last 20 octets of IMCK[j]
388 : */
389 :
390 2 : if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
391 0 : return -1;
392 2 : wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
393 2 : sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
394 : "Inner Methods Compound Keys",
395 : isk, sizeof(isk), imck, sizeof(imck));
396 2 : data->simck_idx++;
397 2 : os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
398 2 : wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
399 2 : data->simck, EAP_FAST_SIMCK_LEN);
400 2 : os_memcpy(data->cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
401 2 : wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
402 2 : data->cmk, EAP_FAST_CMK_LEN);
403 :
404 2 : return 0;
405 : }
406 :
407 :
408 1 : static void * eap_fast_init(struct eap_sm *sm)
409 : {
410 : struct eap_fast_data *data;
411 1 : u8 ciphers[5] = {
412 : TLS_CIPHER_ANON_DH_AES128_SHA,
413 : TLS_CIPHER_AES128_SHA,
414 : TLS_CIPHER_RSA_DHE_AES128_SHA,
415 : TLS_CIPHER_RC4_SHA,
416 : TLS_CIPHER_NONE
417 : };
418 :
419 1 : data = os_zalloc(sizeof(*data));
420 1 : if (data == NULL)
421 0 : return NULL;
422 1 : data->fast_version = EAP_FAST_VERSION;
423 1 : data->force_version = -1;
424 1 : if (sm->user && sm->user->force_version >= 0) {
425 0 : data->force_version = sm->user->force_version;
426 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: forcing version %d",
427 : data->force_version);
428 0 : data->fast_version = data->force_version;
429 : }
430 1 : data->state = START;
431 :
432 1 : if (eap_server_tls_ssl_init(sm, &data->ssl, 0)) {
433 0 : wpa_printf(MSG_INFO, "EAP-FAST: Failed to initialize SSL.");
434 0 : eap_fast_reset(sm, data);
435 0 : return NULL;
436 : }
437 :
438 1 : if (tls_connection_set_cipher_list(sm->ssl_ctx, data->ssl.conn,
439 : ciphers) < 0) {
440 0 : wpa_printf(MSG_INFO, "EAP-FAST: Failed to set TLS cipher "
441 : "suites");
442 0 : eap_fast_reset(sm, data);
443 0 : return NULL;
444 : }
445 :
446 1 : if (tls_connection_set_session_ticket_cb(sm->ssl_ctx, data->ssl.conn,
447 : eap_fast_session_ticket_cb,
448 : data) < 0) {
449 0 : wpa_printf(MSG_INFO, "EAP-FAST: Failed to set SessionTicket "
450 : "callback");
451 0 : eap_fast_reset(sm, data);
452 0 : return NULL;
453 : }
454 :
455 1 : if (sm->pac_opaque_encr_key == NULL) {
456 0 : wpa_printf(MSG_INFO, "EAP-FAST: No PAC-Opaque encryption key "
457 : "configured");
458 0 : eap_fast_reset(sm, data);
459 0 : return NULL;
460 : }
461 1 : os_memcpy(data->pac_opaque_encr, sm->pac_opaque_encr_key,
462 : sizeof(data->pac_opaque_encr));
463 :
464 1 : if (sm->eap_fast_a_id == NULL) {
465 0 : wpa_printf(MSG_INFO, "EAP-FAST: No A-ID configured");
466 0 : eap_fast_reset(sm, data);
467 0 : return NULL;
468 : }
469 1 : data->srv_id = os_malloc(sm->eap_fast_a_id_len);
470 1 : if (data->srv_id == NULL) {
471 0 : eap_fast_reset(sm, data);
472 0 : return NULL;
473 : }
474 1 : os_memcpy(data->srv_id, sm->eap_fast_a_id, sm->eap_fast_a_id_len);
475 1 : data->srv_id_len = sm->eap_fast_a_id_len;
476 :
477 1 : if (sm->eap_fast_a_id_info == NULL) {
478 0 : wpa_printf(MSG_INFO, "EAP-FAST: No A-ID-Info configured");
479 0 : eap_fast_reset(sm, data);
480 0 : return NULL;
481 : }
482 1 : data->srv_id_info = os_strdup(sm->eap_fast_a_id_info);
483 1 : if (data->srv_id_info == NULL) {
484 0 : eap_fast_reset(sm, data);
485 0 : return NULL;
486 : }
487 :
488 : /* PAC-Key lifetime in seconds (hard limit) */
489 1 : data->pac_key_lifetime = sm->pac_key_lifetime;
490 :
491 : /*
492 : * PAC-Key refresh time in seconds (soft limit on remaining hard
493 : * limit). The server will generate a new PAC-Key when this number of
494 : * seconds (or fewer) of the lifetime remains.
495 : */
496 1 : data->pac_key_refresh_time = sm->pac_key_refresh_time;
497 :
498 1 : return data;
499 : }
500 :
501 :
502 1 : static void eap_fast_reset(struct eap_sm *sm, void *priv)
503 : {
504 1 : struct eap_fast_data *data = priv;
505 1 : if (data == NULL)
506 1 : return;
507 1 : if (data->phase2_priv && data->phase2_method)
508 0 : data->phase2_method->reset(sm, data->phase2_priv);
509 1 : eap_server_tls_ssl_deinit(sm, &data->ssl);
510 1 : os_free(data->srv_id);
511 1 : os_free(data->srv_id_info);
512 1 : os_free(data->key_block_p);
513 1 : wpabuf_free(data->pending_phase2_resp);
514 1 : os_free(data->identity);
515 1 : bin_clear_free(data, sizeof(*data));
516 : }
517 :
518 :
519 1 : static struct wpabuf * eap_fast_build_start(struct eap_sm *sm,
520 : struct eap_fast_data *data, u8 id)
521 : {
522 : struct wpabuf *req;
523 :
524 2 : req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_FAST,
525 1 : 1 + sizeof(struct pac_tlv_hdr) + data->srv_id_len,
526 : EAP_CODE_REQUEST, id);
527 1 : if (req == NULL) {
528 0 : wpa_printf(MSG_ERROR, "EAP-FAST: Failed to allocate memory for"
529 : " request");
530 0 : eap_fast_state(data, FAILURE);
531 0 : return NULL;
532 : }
533 :
534 1 : wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->fast_version);
535 :
536 : /* RFC 4851, 4.1.1. Authority ID Data */
537 1 : eap_fast_put_tlv(req, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
538 :
539 1 : eap_fast_state(data, PHASE1);
540 :
541 1 : return req;
542 : }
543 :
544 :
545 1 : static int eap_fast_phase1_done(struct eap_sm *sm, struct eap_fast_data *data)
546 : {
547 : char cipher[64];
548 :
549 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: Phase1 done, starting Phase2");
550 :
551 1 : if (tls_get_cipher(sm->ssl_ctx, data->ssl.conn, cipher, sizeof(cipher))
552 : < 0) {
553 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to get cipher "
554 : "information");
555 0 : eap_fast_state(data, FAILURE);
556 0 : return -1;
557 : }
558 1 : data->anon_provisioning = os_strstr(cipher, "ADH") != NULL;
559 :
560 1 : if (data->anon_provisioning) {
561 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Anonymous provisioning");
562 0 : eap_fast_derive_key_provisioning(sm, data);
563 : } else
564 1 : eap_fast_derive_key_auth(sm, data);
565 :
566 1 : eap_fast_state(data, PHASE2_START);
567 :
568 1 : return 0;
569 : }
570 :
571 :
572 6 : static struct wpabuf * eap_fast_build_phase2_req(struct eap_sm *sm,
573 : struct eap_fast_data *data,
574 : u8 id)
575 : {
576 : struct wpabuf *req;
577 :
578 6 : if (data->phase2_priv == NULL) {
579 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Phase 2 method not "
580 : "initialized");
581 0 : return NULL;
582 : }
583 6 : req = data->phase2_method->buildReq(sm, data->phase2_priv, id);
584 6 : if (req == NULL)
585 0 : return NULL;
586 :
587 6 : wpa_hexdump_buf_key(MSG_MSGDUMP, "EAP-FAST: Phase 2 EAP-Request", req);
588 6 : return eap_fast_tlv_eap_payload(req);
589 : }
590 :
591 :
592 2 : static struct wpabuf * eap_fast_build_crypto_binding(
593 : struct eap_sm *sm, struct eap_fast_data *data)
594 : {
595 : struct wpabuf *buf;
596 : struct eap_tlv_result_tlv *result;
597 : struct eap_tlv_crypto_binding_tlv *binding;
598 :
599 2 : buf = wpabuf_alloc(2 * sizeof(*result) + sizeof(*binding));
600 2 : if (buf == NULL)
601 0 : return NULL;
602 :
603 4 : if (data->send_new_pac || data->anon_provisioning ||
604 2 : data->phase2_method)
605 1 : data->final_result = 0;
606 : else
607 1 : data->final_result = 1;
608 :
609 2 : if (!data->final_result || data->eap_seq > 1) {
610 : /* Intermediate-Result */
611 2 : wpa_printf(MSG_DEBUG, "EAP-FAST: Add Intermediate-Result TLV "
612 : "(status=SUCCESS)");
613 2 : result = wpabuf_put(buf, sizeof(*result));
614 2 : result->tlv_type = host_to_be16(
615 : EAP_TLV_TYPE_MANDATORY |
616 : EAP_TLV_INTERMEDIATE_RESULT_TLV);
617 2 : result->length = host_to_be16(2);
618 2 : result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
619 : }
620 :
621 2 : if (data->final_result) {
622 : /* Result TLV */
623 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV "
624 : "(status=SUCCESS)");
625 1 : result = wpabuf_put(buf, sizeof(*result));
626 1 : result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
627 : EAP_TLV_RESULT_TLV);
628 1 : result->length = host_to_be16(2);
629 1 : result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
630 : }
631 :
632 : /* Crypto-Binding TLV */
633 2 : binding = wpabuf_put(buf, sizeof(*binding));
634 2 : binding->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
635 : EAP_TLV_CRYPTO_BINDING_TLV);
636 2 : binding->length = host_to_be16(sizeof(*binding) -
637 : sizeof(struct eap_tlv_hdr));
638 2 : binding->version = EAP_FAST_VERSION;
639 2 : binding->received_version = data->peer_version;
640 2 : binding->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST;
641 2 : if (random_get_bytes(binding->nonce, sizeof(binding->nonce)) < 0) {
642 0 : wpabuf_free(buf);
643 0 : return NULL;
644 : }
645 :
646 : /*
647 : * RFC 4851, Section 4.2.8:
648 : * The nonce in a request MUST have its least significant bit set to 0.
649 : */
650 2 : binding->nonce[sizeof(binding->nonce) - 1] &= ~0x01;
651 :
652 2 : os_memcpy(data->crypto_binding_nonce, binding->nonce,
653 : sizeof(binding->nonce));
654 :
655 : /*
656 : * RFC 4851, Section 5.3:
657 : * CMK = CMK[j]
658 : * Compound-MAC = HMAC-SHA1( CMK, Crypto-Binding TLV )
659 : */
660 :
661 2 : hmac_sha1(data->cmk, EAP_FAST_CMK_LEN,
662 : (u8 *) binding, sizeof(*binding),
663 2 : binding->compound_mac);
664 :
665 6 : wpa_printf(MSG_DEBUG, "EAP-FAST: Add Crypto-Binding TLV: Version %d "
666 : "Received Version %d SubType %d",
667 4 : binding->version, binding->received_version,
668 2 : binding->subtype);
669 2 : wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
670 2 : binding->nonce, sizeof(binding->nonce));
671 2 : wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
672 2 : binding->compound_mac, sizeof(binding->compound_mac));
673 :
674 2 : return buf;
675 : }
676 :
677 :
678 1 : static struct wpabuf * eap_fast_build_pac(struct eap_sm *sm,
679 : struct eap_fast_data *data)
680 : {
681 : u8 pac_key[EAP_FAST_PAC_KEY_LEN];
682 : u8 *pac_buf, *pac_opaque;
683 : struct wpabuf *buf;
684 : u8 *pos;
685 : size_t buf_len, srv_id_info_len, pac_len;
686 : struct eap_tlv_hdr *pac_tlv;
687 : struct pac_tlv_hdr *pac_info;
688 : struct eap_tlv_result_tlv *result;
689 : struct os_time now;
690 :
691 2 : if (random_get_bytes(pac_key, EAP_FAST_PAC_KEY_LEN) < 0 ||
692 1 : os_get_time(&now) < 0)
693 0 : return NULL;
694 1 : wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Generated PAC-Key",
695 : pac_key, EAP_FAST_PAC_KEY_LEN);
696 :
697 1 : pac_len = (2 + EAP_FAST_PAC_KEY_LEN) + (2 + 4) +
698 1 : (2 + sm->identity_len) + 8;
699 1 : pac_buf = os_malloc(pac_len);
700 1 : if (pac_buf == NULL)
701 0 : return NULL;
702 :
703 1 : srv_id_info_len = os_strlen(data->srv_id_info);
704 :
705 1 : pos = pac_buf;
706 1 : *pos++ = PAC_OPAQUE_TYPE_KEY;
707 1 : *pos++ = EAP_FAST_PAC_KEY_LEN;
708 1 : os_memcpy(pos, pac_key, EAP_FAST_PAC_KEY_LEN);
709 1 : pos += EAP_FAST_PAC_KEY_LEN;
710 :
711 1 : *pos++ = PAC_OPAQUE_TYPE_LIFETIME;
712 1 : *pos++ = 4;
713 1 : WPA_PUT_BE32(pos, now.sec + data->pac_key_lifetime);
714 1 : pos += 4;
715 :
716 1 : if (sm->identity) {
717 1 : *pos++ = PAC_OPAQUE_TYPE_IDENTITY;
718 1 : *pos++ = sm->identity_len;
719 1 : os_memcpy(pos, sm->identity, sm->identity_len);
720 1 : pos += sm->identity_len;
721 : }
722 :
723 1 : pac_len = pos - pac_buf;
724 4 : while (pac_len % 8) {
725 2 : *pos++ = PAC_OPAQUE_TYPE_PAD;
726 2 : pac_len++;
727 : }
728 :
729 1 : pac_opaque = os_malloc(pac_len + 8);
730 1 : if (pac_opaque == NULL) {
731 0 : os_free(pac_buf);
732 0 : return NULL;
733 : }
734 1 : if (aes_wrap(data->pac_opaque_encr, sizeof(data->pac_opaque_encr),
735 1 : pac_len / 8, pac_buf, pac_opaque) < 0) {
736 0 : os_free(pac_buf);
737 0 : os_free(pac_opaque);
738 0 : return NULL;
739 : }
740 1 : os_free(pac_buf);
741 :
742 1 : pac_len += 8;
743 1 : wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque",
744 : pac_opaque, pac_len);
745 :
746 1 : buf_len = sizeof(*pac_tlv) +
747 : sizeof(struct pac_tlv_hdr) + EAP_FAST_PAC_KEY_LEN +
748 1 : sizeof(struct pac_tlv_hdr) + pac_len +
749 2 : data->srv_id_len + srv_id_info_len + 100 + sizeof(*result);
750 1 : buf = wpabuf_alloc(buf_len);
751 1 : if (buf == NULL) {
752 0 : os_free(pac_opaque);
753 0 : return NULL;
754 : }
755 :
756 : /* Result TLV */
757 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV (status=SUCCESS)");
758 1 : result = wpabuf_put(buf, sizeof(*result));
759 1 : WPA_PUT_BE16((u8 *) &result->tlv_type,
760 : EAP_TLV_TYPE_MANDATORY | EAP_TLV_RESULT_TLV);
761 1 : WPA_PUT_BE16((u8 *) &result->length, 2);
762 1 : WPA_PUT_BE16((u8 *) &result->status, EAP_TLV_RESULT_SUCCESS);
763 :
764 : /* PAC TLV */
765 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV");
766 1 : pac_tlv = wpabuf_put(buf, sizeof(*pac_tlv));
767 1 : pac_tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
768 : EAP_TLV_PAC_TLV);
769 :
770 : /* PAC-Key */
771 1 : eap_fast_put_tlv(buf, PAC_TYPE_PAC_KEY, pac_key, EAP_FAST_PAC_KEY_LEN);
772 :
773 : /* PAC-Opaque */
774 1 : eap_fast_put_tlv(buf, PAC_TYPE_PAC_OPAQUE, pac_opaque, pac_len);
775 1 : os_free(pac_opaque);
776 :
777 : /* PAC-Info */
778 1 : pac_info = wpabuf_put(buf, sizeof(*pac_info));
779 1 : pac_info->type = host_to_be16(PAC_TYPE_PAC_INFO);
780 :
781 : /* PAC-Lifetime (inside PAC-Info) */
782 1 : eap_fast_put_tlv_hdr(buf, PAC_TYPE_CRED_LIFETIME, 4);
783 1 : wpabuf_put_be32(buf, now.sec + data->pac_key_lifetime);
784 :
785 : /* A-ID (inside PAC-Info) */
786 1 : eap_fast_put_tlv(buf, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
787 :
788 : /* Note: headers may be misaligned after A-ID */
789 :
790 1 : if (sm->identity) {
791 1 : eap_fast_put_tlv(buf, PAC_TYPE_I_ID, sm->identity,
792 1 : sm->identity_len);
793 : }
794 :
795 : /* A-ID-Info (inside PAC-Info) */
796 1 : eap_fast_put_tlv(buf, PAC_TYPE_A_ID_INFO, data->srv_id_info,
797 : srv_id_info_len);
798 :
799 : /* PAC-Type (inside PAC-Info) */
800 1 : eap_fast_put_tlv_hdr(buf, PAC_TYPE_PAC_TYPE, 2);
801 1 : wpabuf_put_be16(buf, PAC_TYPE_TUNNEL_PAC);
802 :
803 : /* Update PAC-Info and PAC TLV Length fields */
804 1 : pos = wpabuf_put(buf, 0);
805 1 : pac_info->len = host_to_be16(pos - (u8 *) (pac_info + 1));
806 1 : pac_tlv->length = host_to_be16(pos - (u8 *) (pac_tlv + 1));
807 :
808 1 : return buf;
809 : }
810 :
811 :
812 8 : static int eap_fast_encrypt_phase2(struct eap_sm *sm,
813 : struct eap_fast_data *data,
814 : struct wpabuf *plain, int piggyback)
815 : {
816 : struct wpabuf *encr;
817 :
818 8 : wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 TLVs",
819 : plain);
820 8 : encr = eap_server_tls_encrypt(sm, &data->ssl, plain);
821 8 : wpabuf_free(plain);
822 :
823 8 : if (data->ssl.tls_out && piggyback) {
824 3 : wpa_printf(MSG_DEBUG, "EAP-FAST: Piggyback Phase 2 data "
825 : "(len=%d) with last Phase 1 Message (len=%d "
826 : "used=%d)",
827 1 : (int) wpabuf_len(encr),
828 1 : (int) wpabuf_len(data->ssl.tls_out),
829 1 : (int) data->ssl.tls_out_pos);
830 1 : if (wpabuf_resize(&data->ssl.tls_out, wpabuf_len(encr)) < 0) {
831 0 : wpa_printf(MSG_WARNING, "EAP-FAST: Failed to resize "
832 : "output buffer");
833 0 : wpabuf_free(encr);
834 0 : return -1;
835 : }
836 1 : wpabuf_put_buf(data->ssl.tls_out, encr);
837 1 : wpabuf_free(encr);
838 : } else {
839 7 : wpabuf_free(data->ssl.tls_out);
840 7 : data->ssl.tls_out_pos = 0;
841 7 : data->ssl.tls_out = encr;
842 : }
843 :
844 8 : return 0;
845 : }
846 :
847 :
848 10 : static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id)
849 : {
850 10 : struct eap_fast_data *data = priv;
851 10 : struct wpabuf *req = NULL;
852 10 : int piggyback = 0;
853 :
854 10 : if (data->ssl.state == FRAG_ACK) {
855 0 : return eap_server_tls_build_ack(id, EAP_TYPE_FAST,
856 : data->fast_version);
857 : }
858 :
859 10 : if (data->ssl.state == WAIT_FRAG_ACK) {
860 0 : return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
861 : data->fast_version, id);
862 : }
863 :
864 10 : switch (data->state) {
865 : case START:
866 1 : return eap_fast_build_start(sm, data, id);
867 : case PHASE1:
868 2 : if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
869 1 : if (eap_fast_phase1_done(sm, data) < 0)
870 0 : return NULL;
871 1 : if (data->state == PHASE2_START) {
872 : /*
873 : * Try to generate Phase 2 data to piggyback
874 : * with the end of Phase 1 to avoid extra
875 : * roundtrip.
876 : */
877 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: Try to start "
878 : "Phase 2");
879 1 : if (eap_fast_process_phase2_start(sm, data))
880 0 : break;
881 1 : req = eap_fast_build_phase2_req(sm, data, id);
882 1 : piggyback = 1;
883 : }
884 : }
885 2 : break;
886 : case PHASE2_ID:
887 : case PHASE2_METHOD:
888 4 : req = eap_fast_build_phase2_req(sm, data, id);
889 4 : break;
890 : case CRYPTO_BINDING:
891 2 : req = eap_fast_build_crypto_binding(sm, data);
892 2 : if (data->phase2_method) {
893 : /*
894 : * Include the start of the next EAP method in the
895 : * sequence in the same message with Crypto-Binding to
896 : * save a round-trip.
897 : */
898 : struct wpabuf *eap;
899 1 : eap = eap_fast_build_phase2_req(sm, data, id);
900 1 : req = wpabuf_concat(req, eap);
901 1 : eap_fast_state(data, PHASE2_METHOD);
902 : }
903 2 : break;
904 : case REQUEST_PAC:
905 1 : req = eap_fast_build_pac(sm, data);
906 1 : break;
907 : default:
908 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
909 0 : __func__, data->state);
910 0 : return NULL;
911 : }
912 :
913 17 : if (req &&
914 8 : eap_fast_encrypt_phase2(sm, data, req, piggyback) < 0)
915 0 : return NULL;
916 :
917 9 : return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
918 : data->fast_version, id);
919 : }
920 :
921 :
922 10 : static Boolean eap_fast_check(struct eap_sm *sm, void *priv,
923 : struct wpabuf *respData)
924 : {
925 : const u8 *pos;
926 : size_t len;
927 :
928 10 : pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_FAST, respData, &len);
929 10 : if (pos == NULL || len < 1) {
930 0 : wpa_printf(MSG_INFO, "EAP-FAST: Invalid frame");
931 0 : return TRUE;
932 : }
933 :
934 10 : return FALSE;
935 : }
936 :
937 :
938 5 : static int eap_fast_phase2_init(struct eap_sm *sm, struct eap_fast_data *data,
939 : EapType eap_type)
940 : {
941 5 : if (data->phase2_priv && data->phase2_method) {
942 4 : data->phase2_method->reset(sm, data->phase2_priv);
943 4 : data->phase2_method = NULL;
944 4 : data->phase2_priv = NULL;
945 : }
946 5 : data->phase2_method = eap_server_get_eap_method(EAP_VENDOR_IETF,
947 : eap_type);
948 5 : if (!data->phase2_method)
949 1 : return -1;
950 :
951 4 : if (data->key_block_p) {
952 0 : sm->auth_challenge = data->key_block_p->server_challenge;
953 0 : sm->peer_challenge = data->key_block_p->client_challenge;
954 : }
955 4 : sm->init_phase2 = 1;
956 4 : data->phase2_priv = data->phase2_method->init(sm);
957 4 : sm->init_phase2 = 0;
958 4 : sm->auth_challenge = NULL;
959 4 : sm->peer_challenge = NULL;
960 :
961 4 : return data->phase2_priv == NULL ? -1 : 0;
962 : }
963 :
964 :
965 6 : static void eap_fast_process_phase2_response(struct eap_sm *sm,
966 : struct eap_fast_data *data,
967 : u8 *in_data, size_t in_len)
968 : {
969 6 : u8 next_type = EAP_TYPE_NONE;
970 : struct eap_hdr *hdr;
971 : u8 *pos;
972 : size_t left;
973 : struct wpabuf buf;
974 6 : const struct eap_method *m = data->phase2_method;
975 6 : void *priv = data->phase2_priv;
976 :
977 6 : if (priv == NULL) {
978 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: %s - Phase2 not "
979 : "initialized?!", __func__);
980 0 : return;
981 : }
982 :
983 6 : hdr = (struct eap_hdr *) in_data;
984 6 : pos = (u8 *) (hdr + 1);
985 :
986 6 : if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
987 1 : left = in_len - sizeof(*hdr);
988 1 : wpa_hexdump(MSG_DEBUG, "EAP-FAST: Phase2 type Nak'ed; "
989 : "allowed types", pos + 1, left - 1);
990 : #ifdef EAP_SERVER_TNC
991 2 : if (m && m->vendor == EAP_VENDOR_IETF &&
992 1 : m->method == EAP_TYPE_TNC) {
993 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Peer Nak'ed required "
994 : "TNC negotiation");
995 0 : next_type = eap_fast_req_failure(sm, data);
996 0 : eap_fast_phase2_init(sm, data, next_type);
997 0 : return;
998 : }
999 : #endif /* EAP_SERVER_TNC */
1000 1 : eap_sm_process_nak(sm, pos + 1, left - 1);
1001 2 : if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
1002 1 : sm->user->methods[sm->user_eap_method_index].method !=
1003 : EAP_TYPE_NONE) {
1004 2 : next_type = sm->user->methods[
1005 1 : sm->user_eap_method_index++].method;
1006 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d",
1007 : next_type);
1008 : } else {
1009 0 : next_type = eap_fast_req_failure(sm, data);
1010 : }
1011 1 : eap_fast_phase2_init(sm, data, next_type);
1012 1 : return;
1013 : }
1014 :
1015 5 : wpabuf_set(&buf, in_data, in_len);
1016 :
1017 5 : if (m->check(sm, priv, &buf)) {
1018 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 check() asked to "
1019 : "ignore the packet");
1020 0 : next_type = eap_fast_req_failure(sm, data);
1021 0 : return;
1022 : }
1023 :
1024 5 : m->process(sm, priv, &buf);
1025 :
1026 5 : if (!m->isDone(sm, priv))
1027 2 : return;
1028 :
1029 3 : if (!m->isSuccess(sm, priv)) {
1030 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method failed");
1031 0 : next_type = eap_fast_req_failure(sm, data);
1032 0 : eap_fast_phase2_init(sm, data, next_type);
1033 0 : return;
1034 : }
1035 :
1036 3 : switch (data->state) {
1037 : case PHASE2_ID:
1038 1 : if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1039 0 : wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Phase2 "
1040 : "Identity not found in the user "
1041 : "database",
1042 0 : sm->identity, sm->identity_len);
1043 0 : next_type = eap_fast_req_failure(sm, data);
1044 0 : break;
1045 : }
1046 :
1047 1 : eap_fast_state(data, PHASE2_METHOD);
1048 1 : if (data->anon_provisioning) {
1049 : /*
1050 : * Only EAP-MSCHAPv2 is allowed for anonymous
1051 : * provisioning.
1052 : */
1053 0 : next_type = EAP_TYPE_MSCHAPV2;
1054 0 : sm->user_eap_method_index = 0;
1055 : } else {
1056 1 : next_type = sm->user->methods[0].method;
1057 1 : sm->user_eap_method_index = 1;
1058 : }
1059 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d", next_type);
1060 1 : break;
1061 : case PHASE2_METHOD:
1062 : case CRYPTO_BINDING:
1063 2 : eap_fast_update_icmk(sm, data);
1064 2 : eap_fast_state(data, CRYPTO_BINDING);
1065 2 : data->eap_seq++;
1066 2 : next_type = EAP_TYPE_NONE;
1067 : #ifdef EAP_SERVER_TNC
1068 2 : if (sm->tnc && !data->tnc_started) {
1069 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: Initialize TNC");
1070 1 : next_type = EAP_TYPE_TNC;
1071 1 : data->tnc_started = 1;
1072 : }
1073 : #endif /* EAP_SERVER_TNC */
1074 2 : break;
1075 : case FAILURE:
1076 0 : break;
1077 : default:
1078 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
1079 0 : __func__, data->state);
1080 0 : break;
1081 : }
1082 :
1083 3 : eap_fast_phase2_init(sm, data, next_type);
1084 : }
1085 :
1086 :
1087 6 : static void eap_fast_process_phase2_eap(struct eap_sm *sm,
1088 : struct eap_fast_data *data,
1089 : u8 *in_data, size_t in_len)
1090 : {
1091 : struct eap_hdr *hdr;
1092 : size_t len;
1093 :
1094 6 : hdr = (struct eap_hdr *) in_data;
1095 6 : if (in_len < (int) sizeof(*hdr)) {
1096 0 : wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1097 : "EAP frame (len=%lu)", (unsigned long) in_len);
1098 0 : eap_fast_req_failure(sm, data);
1099 0 : return;
1100 : }
1101 6 : len = be_to_host16(hdr->length);
1102 6 : if (len > in_len) {
1103 0 : wpa_printf(MSG_INFO, "EAP-FAST: Length mismatch in "
1104 : "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
1105 : (unsigned long) in_len, (unsigned long) len);
1106 0 : eap_fast_req_failure(sm, data);
1107 0 : return;
1108 : }
1109 12 : wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: code=%d "
1110 12 : "identifier=%d length=%lu", hdr->code, hdr->identifier,
1111 : (unsigned long) len);
1112 6 : switch (hdr->code) {
1113 : case EAP_CODE_RESPONSE:
1114 6 : eap_fast_process_phase2_response(sm, data, (u8 *) hdr, len);
1115 6 : break;
1116 : default:
1117 0 : wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
1118 0 : "Phase 2 EAP header", hdr->code);
1119 0 : break;
1120 : }
1121 : }
1122 :
1123 :
1124 8 : static int eap_fast_parse_tlvs(struct wpabuf *data,
1125 : struct eap_fast_tlv_parse *tlv)
1126 : {
1127 : int mandatory, tlv_type, res;
1128 : size_t len;
1129 : u8 *pos, *end;
1130 :
1131 8 : os_memset(tlv, 0, sizeof(*tlv));
1132 :
1133 8 : pos = wpabuf_mhead(data);
1134 8 : end = pos + wpabuf_len(data);
1135 33 : while (pos + 4 < end) {
1136 17 : mandatory = pos[0] & 0x80;
1137 17 : tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1138 17 : pos += 2;
1139 17 : len = WPA_GET_BE16(pos);
1140 17 : pos += 2;
1141 17 : if (len > (size_t) (end - pos)) {
1142 0 : wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1143 0 : return -1;
1144 : }
1145 17 : wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1146 : "TLV type %d length %u%s",
1147 : tlv_type, (unsigned int) len,
1148 : mandatory ? " (mandatory)" : "");
1149 :
1150 17 : res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1151 17 : if (res == -2)
1152 0 : break;
1153 17 : if (res < 0) {
1154 0 : if (mandatory) {
1155 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1156 : "mandatory TLV type %d", tlv_type);
1157 : /* TODO: generate Nak TLV */
1158 0 : break;
1159 : } else {
1160 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored "
1161 : "unknown optional TLV type %d",
1162 : tlv_type);
1163 : }
1164 : }
1165 :
1166 17 : pos += len;
1167 : }
1168 :
1169 8 : return 0;
1170 : }
1171 :
1172 :
1173 1 : static int eap_fast_validate_crypto_binding(
1174 : struct eap_fast_data *data, struct eap_tlv_crypto_binding_tlv *b,
1175 : size_t bind_len)
1176 : {
1177 : u8 cmac[SHA1_MAC_LEN];
1178 :
1179 3 : wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: "
1180 : "Version %d Received Version %d SubType %d",
1181 3 : b->version, b->received_version, b->subtype);
1182 1 : wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
1183 1 : b->nonce, sizeof(b->nonce));
1184 1 : wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
1185 1 : b->compound_mac, sizeof(b->compound_mac));
1186 :
1187 2 : if (b->version != EAP_FAST_VERSION ||
1188 1 : b->received_version != EAP_FAST_VERSION) {
1189 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected version "
1190 : "in Crypto-Binding: version %d "
1191 0 : "received_version %d", b->version,
1192 0 : b->received_version);
1193 0 : return -1;
1194 : }
1195 :
1196 1 : if (b->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE) {
1197 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected subtype in "
1198 0 : "Crypto-Binding: %d", b->subtype);
1199 0 : return -1;
1200 : }
1201 :
1202 2 : if (os_memcmp_const(data->crypto_binding_nonce, b->nonce, 31) != 0 ||
1203 1 : (data->crypto_binding_nonce[31] | 1) != b->nonce[31]) {
1204 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid nonce in "
1205 : "Crypto-Binding");
1206 0 : return -1;
1207 : }
1208 :
1209 1 : os_memcpy(cmac, b->compound_mac, sizeof(cmac));
1210 1 : os_memset(b->compound_mac, 0, sizeof(cmac));
1211 1 : wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for "
1212 : "Compound MAC calculation",
1213 : (u8 *) b, bind_len);
1214 1 : hmac_sha1(data->cmk, EAP_FAST_CMK_LEN, (u8 *) b, bind_len,
1215 1 : b->compound_mac);
1216 1 : if (os_memcmp_const(cmac, b->compound_mac, sizeof(cmac)) != 0) {
1217 0 : wpa_hexdump(MSG_MSGDUMP,
1218 : "EAP-FAST: Calculated Compound MAC",
1219 0 : b->compound_mac, sizeof(cmac));
1220 0 : wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not "
1221 : "match");
1222 0 : return -1;
1223 : }
1224 :
1225 1 : return 0;
1226 : }
1227 :
1228 :
1229 1 : static int eap_fast_pac_type(u8 *pac, size_t len, u16 type)
1230 : {
1231 : struct eap_tlv_pac_type_tlv *tlv;
1232 :
1233 1 : if (pac == NULL || len != sizeof(*tlv))
1234 0 : return 0;
1235 :
1236 1 : tlv = (struct eap_tlv_pac_type_tlv *) pac;
1237 :
1238 3 : return be_to_host16(tlv->tlv_type) == PAC_TYPE_PAC_TYPE &&
1239 2 : be_to_host16(tlv->length) == 2 &&
1240 1 : be_to_host16(tlv->pac_type) == type;
1241 : }
1242 :
1243 :
1244 8 : static void eap_fast_process_phase2_tlvs(struct eap_sm *sm,
1245 : struct eap_fast_data *data,
1246 : struct wpabuf *in_data)
1247 : {
1248 : struct eap_fast_tlv_parse tlv;
1249 8 : int check_crypto_binding = data->state == CRYPTO_BINDING;
1250 :
1251 8 : if (eap_fast_parse_tlvs(in_data, &tlv) < 0) {
1252 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to parse received "
1253 : "Phase 2 TLVs");
1254 0 : return;
1255 : }
1256 :
1257 8 : if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1258 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Result TLV indicated "
1259 : "failure");
1260 0 : eap_fast_state(data, FAILURE);
1261 0 : return;
1262 : }
1263 :
1264 8 : if (data->state == REQUEST_PAC) {
1265 : u16 type, len, res;
1266 1 : if (tlv.pac == NULL || tlv.pac_len < 6) {
1267 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC "
1268 : "Acknowledgement received");
1269 0 : eap_fast_state(data, FAILURE);
1270 0 : return;
1271 : }
1272 :
1273 1 : type = WPA_GET_BE16(tlv.pac);
1274 1 : len = WPA_GET_BE16(tlv.pac + 2);
1275 1 : res = WPA_GET_BE16(tlv.pac + 4);
1276 :
1277 1 : if (type != PAC_TYPE_PAC_ACKNOWLEDGEMENT || len != 2 ||
1278 : res != EAP_TLV_RESULT_SUCCESS) {
1279 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV did not "
1280 : "contain acknowledgement");
1281 0 : eap_fast_state(data, FAILURE);
1282 0 : return;
1283 : }
1284 :
1285 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Acknowledgement received "
1286 : "- PAC provisioning succeeded");
1287 2 : eap_fast_state(data, (data->anon_provisioning ||
1288 1 : data->send_new_pac == 2) ?
1289 : FAILURE : SUCCESS);
1290 1 : return;
1291 : }
1292 :
1293 7 : if (check_crypto_binding) {
1294 1 : if (tlv.crypto_binding == NULL) {
1295 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: No Crypto-Binding "
1296 : "TLV received");
1297 0 : eap_fast_state(data, FAILURE);
1298 0 : return;
1299 : }
1300 :
1301 2 : if (data->final_result &&
1302 1 : tlv.result != EAP_TLV_RESULT_SUCCESS) {
1303 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1304 : "without Success Result");
1305 0 : eap_fast_state(data, FAILURE);
1306 0 : return;
1307 : }
1308 :
1309 1 : if (!data->final_result &&
1310 0 : tlv.iresult != EAP_TLV_RESULT_SUCCESS) {
1311 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1312 : "without intermediate Success Result");
1313 0 : eap_fast_state(data, FAILURE);
1314 0 : return;
1315 : }
1316 :
1317 1 : if (eap_fast_validate_crypto_binding(data, tlv.crypto_binding,
1318 : tlv.crypto_binding_len)) {
1319 0 : eap_fast_state(data, FAILURE);
1320 0 : return;
1321 : }
1322 :
1323 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: Valid Crypto-Binding TLV "
1324 : "received");
1325 1 : if (data->final_result) {
1326 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1327 : "completed successfully");
1328 : }
1329 :
1330 1 : if (data->anon_provisioning &&
1331 0 : sm->eap_fast_prov != ANON_PROV &&
1332 0 : sm->eap_fast_prov != BOTH_PROV) {
1333 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1334 : "use unauthenticated provisioning which is "
1335 : "disabled");
1336 0 : eap_fast_state(data, FAILURE);
1337 0 : return;
1338 : }
1339 :
1340 2 : if (sm->eap_fast_prov != AUTH_PROV &&
1341 1 : sm->eap_fast_prov != BOTH_PROV &&
1342 0 : tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1343 0 : eap_fast_pac_type(tlv.pac, tlv.pac_len,
1344 : PAC_TYPE_TUNNEL_PAC)) {
1345 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1346 : "use authenticated provisioning which is "
1347 : "disabled");
1348 0 : eap_fast_state(data, FAILURE);
1349 0 : return;
1350 : }
1351 :
1352 2 : if (data->anon_provisioning ||
1353 2 : (tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1354 1 : eap_fast_pac_type(tlv.pac, tlv.pac_len,
1355 : PAC_TYPE_TUNNEL_PAC))) {
1356 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: Requested a new "
1357 : "Tunnel PAC");
1358 1 : eap_fast_state(data, REQUEST_PAC);
1359 0 : } else if (data->send_new_pac) {
1360 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Server triggered "
1361 : "re-keying of Tunnel PAC");
1362 0 : eap_fast_state(data, REQUEST_PAC);
1363 0 : } else if (data->final_result)
1364 0 : eap_fast_state(data, SUCCESS);
1365 : }
1366 :
1367 7 : if (tlv.eap_payload_tlv) {
1368 6 : eap_fast_process_phase2_eap(sm, data, tlv.eap_payload_tlv,
1369 : tlv.eap_payload_tlv_len);
1370 : }
1371 : }
1372 :
1373 :
1374 8 : static void eap_fast_process_phase2(struct eap_sm *sm,
1375 : struct eap_fast_data *data,
1376 : struct wpabuf *in_buf)
1377 : {
1378 : struct wpabuf *in_decrypted;
1379 :
1380 8 : wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1381 : " Phase 2", (unsigned long) wpabuf_len(in_buf));
1382 :
1383 8 : if (data->pending_phase2_resp) {
1384 0 : wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
1385 : "skip decryption and use old data");
1386 0 : eap_fast_process_phase2_tlvs(sm, data,
1387 : data->pending_phase2_resp);
1388 0 : wpabuf_free(data->pending_phase2_resp);
1389 0 : data->pending_phase2_resp = NULL;
1390 0 : return;
1391 : }
1392 :
1393 8 : in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
1394 : in_buf);
1395 8 : if (in_decrypted == NULL) {
1396 0 : wpa_printf(MSG_INFO, "EAP-FAST: Failed to decrypt Phase 2 "
1397 : "data");
1398 0 : eap_fast_state(data, FAILURE);
1399 0 : return;
1400 : }
1401 :
1402 8 : wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Decrypted Phase 2 TLVs",
1403 : in_decrypted);
1404 :
1405 8 : eap_fast_process_phase2_tlvs(sm, data, in_decrypted);
1406 :
1407 8 : if (sm->method_pending == METHOD_PENDING_WAIT) {
1408 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method is in "
1409 : "pending wait state - save decrypted response");
1410 0 : wpabuf_free(data->pending_phase2_resp);
1411 0 : data->pending_phase2_resp = in_decrypted;
1412 0 : return;
1413 : }
1414 :
1415 8 : wpabuf_free(in_decrypted);
1416 : }
1417 :
1418 :
1419 10 : static int eap_fast_process_version(struct eap_sm *sm, void *priv,
1420 : int peer_version)
1421 : {
1422 10 : struct eap_fast_data *data = priv;
1423 :
1424 10 : data->peer_version = peer_version;
1425 :
1426 10 : if (data->force_version >= 0 && peer_version != data->force_version) {
1427 0 : wpa_printf(MSG_INFO, "EAP-FAST: peer did not select the forced"
1428 : " version (forced=%d peer=%d) - reject",
1429 : data->force_version, peer_version);
1430 0 : return -1;
1431 : }
1432 :
1433 10 : if (peer_version < data->fast_version) {
1434 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: peer ver=%d, own ver=%d; "
1435 : "use version %d",
1436 : peer_version, data->fast_version, peer_version);
1437 0 : data->fast_version = peer_version;
1438 : }
1439 :
1440 10 : return 0;
1441 : }
1442 :
1443 :
1444 2 : static int eap_fast_process_phase1(struct eap_sm *sm,
1445 : struct eap_fast_data *data)
1446 : {
1447 2 : if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
1448 0 : wpa_printf(MSG_INFO, "EAP-FAST: TLS processing failed");
1449 0 : eap_fast_state(data, FAILURE);
1450 0 : return -1;
1451 : }
1452 :
1453 3 : if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
1454 1 : wpabuf_len(data->ssl.tls_out) > 0)
1455 2 : return 1;
1456 :
1457 : /*
1458 : * Phase 1 was completed with the received message (e.g., when using
1459 : * abbreviated handshake), so Phase 2 can be started immediately
1460 : * without having to send through an empty message to the peer.
1461 : */
1462 :
1463 0 : return eap_fast_phase1_done(sm, data);
1464 : }
1465 :
1466 :
1467 1 : static int eap_fast_process_phase2_start(struct eap_sm *sm,
1468 : struct eap_fast_data *data)
1469 : {
1470 : u8 next_type;
1471 :
1472 1 : if (data->identity) {
1473 0 : os_free(sm->identity);
1474 0 : sm->identity = data->identity;
1475 0 : data->identity = NULL;
1476 0 : sm->identity_len = data->identity_len;
1477 0 : data->identity_len = 0;
1478 0 : sm->require_identity_match = 1;
1479 0 : if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1480 0 : wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: "
1481 : "Phase2 Identity not found "
1482 : "in the user database",
1483 0 : sm->identity, sm->identity_len);
1484 0 : next_type = eap_fast_req_failure(sm, data);
1485 : } else {
1486 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Identity already "
1487 : "known - skip Phase 2 Identity Request");
1488 0 : next_type = sm->user->methods[0].method;
1489 0 : sm->user_eap_method_index = 1;
1490 : }
1491 :
1492 0 : eap_fast_state(data, PHASE2_METHOD);
1493 : } else {
1494 1 : eap_fast_state(data, PHASE2_ID);
1495 1 : next_type = EAP_TYPE_IDENTITY;
1496 : }
1497 :
1498 1 : return eap_fast_phase2_init(sm, data, next_type);
1499 : }
1500 :
1501 :
1502 10 : static void eap_fast_process_msg(struct eap_sm *sm, void *priv,
1503 : const struct wpabuf *respData)
1504 : {
1505 10 : struct eap_fast_data *data = priv;
1506 :
1507 10 : switch (data->state) {
1508 : case PHASE1:
1509 2 : if (eap_fast_process_phase1(sm, data))
1510 2 : break;
1511 :
1512 : /* fall through to PHASE2_START */
1513 : case PHASE2_START:
1514 0 : eap_fast_process_phase2_start(sm, data);
1515 0 : break;
1516 : case PHASE2_ID:
1517 : case PHASE2_METHOD:
1518 : case CRYPTO_BINDING:
1519 : case REQUEST_PAC:
1520 8 : eap_fast_process_phase2(sm, data, data->ssl.tls_in);
1521 8 : break;
1522 : default:
1523 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected state %d in %s",
1524 0 : data->state, __func__);
1525 0 : break;
1526 : }
1527 10 : }
1528 :
1529 :
1530 10 : static void eap_fast_process(struct eap_sm *sm, void *priv,
1531 : struct wpabuf *respData)
1532 : {
1533 10 : struct eap_fast_data *data = priv;
1534 10 : if (eap_server_tls_process(sm, &data->ssl, respData, data,
1535 : EAP_TYPE_FAST, eap_fast_process_version,
1536 : eap_fast_process_msg) < 0)
1537 0 : eap_fast_state(data, FAILURE);
1538 10 : }
1539 :
1540 :
1541 10 : static Boolean eap_fast_isDone(struct eap_sm *sm, void *priv)
1542 : {
1543 10 : struct eap_fast_data *data = priv;
1544 10 : return data->state == SUCCESS || data->state == FAILURE;
1545 : }
1546 :
1547 :
1548 1 : static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1549 : {
1550 1 : struct eap_fast_data *data = priv;
1551 : u8 *eapKeyData;
1552 :
1553 1 : if (data->state != SUCCESS)
1554 0 : return NULL;
1555 :
1556 1 : eapKeyData = os_malloc(EAP_FAST_KEY_LEN);
1557 1 : if (eapKeyData == NULL)
1558 0 : return NULL;
1559 :
1560 1 : eap_fast_derive_eap_msk(data->simck, eapKeyData);
1561 1 : *len = EAP_FAST_KEY_LEN;
1562 :
1563 1 : return eapKeyData;
1564 : }
1565 :
1566 :
1567 0 : static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1568 : {
1569 0 : struct eap_fast_data *data = priv;
1570 : u8 *eapKeyData;
1571 :
1572 0 : if (data->state != SUCCESS)
1573 0 : return NULL;
1574 :
1575 0 : eapKeyData = os_malloc(EAP_EMSK_LEN);
1576 0 : if (eapKeyData == NULL)
1577 0 : return NULL;
1578 :
1579 0 : eap_fast_derive_eap_emsk(data->simck, eapKeyData);
1580 0 : *len = EAP_EMSK_LEN;
1581 :
1582 0 : return eapKeyData;
1583 : }
1584 :
1585 :
1586 1 : static Boolean eap_fast_isSuccess(struct eap_sm *sm, void *priv)
1587 : {
1588 1 : struct eap_fast_data *data = priv;
1589 1 : return data->state == SUCCESS;
1590 : }
1591 :
1592 :
1593 1 : int eap_server_fast_register(void)
1594 : {
1595 : struct eap_method *eap;
1596 : int ret;
1597 :
1598 1 : eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
1599 : EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1600 1 : if (eap == NULL)
1601 0 : return -1;
1602 :
1603 1 : eap->init = eap_fast_init;
1604 1 : eap->reset = eap_fast_reset;
1605 1 : eap->buildReq = eap_fast_buildReq;
1606 1 : eap->check = eap_fast_check;
1607 1 : eap->process = eap_fast_process;
1608 1 : eap->isDone = eap_fast_isDone;
1609 1 : eap->getKey = eap_fast_getKey;
1610 1 : eap->get_emsk = eap_fast_get_emsk;
1611 1 : eap->isSuccess = eap_fast_isSuccess;
1612 :
1613 1 : ret = eap_server_method_register(eap);
1614 1 : if (ret)
1615 0 : eap_server_method_free(eap);
1616 1 : return ret;
1617 : }
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