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 :
75 284 : static const char * eap_fast_state_txt(int state)
76 : {
77 284 : switch (state) {
78 : case START:
79 26 : return "START";
80 : case PHASE1:
81 50 : return "PHASE1";
82 : case PHASE2_START:
83 46 : return "PHASE2_START";
84 : case PHASE2_ID:
85 25 : return "PHASE2_ID";
86 : case PHASE2_METHOD:
87 46 : return "PHASE2_METHOD";
88 : case CRYPTO_BINDING:
89 44 : return "CRYPTO_BINDING";
90 : case REQUEST_PAC:
91 24 : return "REQUEST_PAC";
92 : case SUCCESS:
93 16 : return "SUCCESS";
94 : case FAILURE:
95 7 : return "FAILURE";
96 : default:
97 0 : return "Unknown?!";
98 : }
99 : }
100 :
101 :
102 142 : static void eap_fast_state(struct eap_fast_data *data, int state)
103 : {
104 284 : wpa_printf(MSG_DEBUG, "EAP-FAST: %s -> %s",
105 142 : eap_fast_state_txt(data->state),
106 : eap_fast_state_txt(state));
107 142 : data->state = state;
108 142 : }
109 :
110 :
111 1 : static EapType eap_fast_req_failure(struct eap_sm *sm,
112 : struct eap_fast_data *data)
113 : {
114 : /* TODO: send Result TLV(FAILURE) */
115 1 : eap_fast_state(data, FAILURE);
116 1 : return EAP_TYPE_NONE;
117 : }
118 :
119 :
120 23 : 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 23 : struct eap_fast_data *data = ctx;
126 : const u8 *pac_opaque;
127 : size_t pac_opaque_len;
128 23 : u8 *buf, *pos, *end, *pac_key = NULL;
129 23 : os_time_t lifetime = 0;
130 : struct os_time now;
131 23 : u8 *identity = NULL;
132 23 : size_t identity_len = 0;
133 :
134 23 : wpa_printf(MSG_DEBUG, "EAP-FAST: SessionTicket callback");
135 23 : wpa_hexdump(MSG_DEBUG, "EAP-FAST: SessionTicket (PAC-Opaque)",
136 : ticket, len);
137 :
138 23 : if (len < 4 || WPA_GET_BE16(ticket) != PAC_TYPE_PAC_OPAQUE) {
139 13 : wpa_printf(MSG_DEBUG, "EAP-FAST: Ignore invalid "
140 : "SessionTicket");
141 13 : return 0;
142 : }
143 :
144 10 : pac_opaque_len = WPA_GET_BE16(ticket + 2);
145 10 : pac_opaque = ticket + 4;
146 20 : if (pac_opaque_len < 8 || pac_opaque_len % 8 ||
147 10 : 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 10 : wpa_hexdump(MSG_DEBUG, "EAP-FAST: Received PAC-Opaque",
155 : pac_opaque, pac_opaque_len);
156 :
157 10 : buf = os_malloc(pac_opaque_len - 8);
158 10 : 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 10 : if (aes_unwrap(data->pac_opaque_encr, sizeof(data->pac_opaque_encr),
165 10 : (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 10 : end = buf + pac_opaque_len - 8;
179 10 : wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Decrypted PAC-Opaque",
180 10 : buf, end - buf);
181 :
182 10 : pos = buf;
183 50 : while (pos + 1 < end) {
184 40 : if (pos + 2 + pos[1] > end)
185 0 : break;
186 :
187 40 : switch (*pos) {
188 : case PAC_OPAQUE_TYPE_PAD:
189 10 : goto done;
190 : case PAC_OPAQUE_TYPE_KEY:
191 10 : if (pos[1] != EAP_FAST_PAC_KEY_LEN) {
192 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
193 0 : "PAC-Key length %d", pos[1]);
194 0 : os_free(buf);
195 0 : return -1;
196 : }
197 10 : pac_key = pos + 2;
198 10 : wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: PAC-Key from "
199 : "decrypted PAC-Opaque",
200 : pac_key, EAP_FAST_PAC_KEY_LEN);
201 10 : break;
202 : case PAC_OPAQUE_TYPE_LIFETIME:
203 10 : if (pos[1] != 4) {
204 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid "
205 : "PAC-Key lifetime length %d",
206 0 : pos[1]);
207 0 : os_free(buf);
208 0 : return -1;
209 : }
210 10 : lifetime = WPA_GET_BE32(pos + 2);
211 10 : break;
212 : case PAC_OPAQUE_TYPE_IDENTITY:
213 10 : identity = pos + 2;
214 10 : identity_len = pos[1];
215 10 : break;
216 : }
217 :
218 30 : pos += 2 + pos[1];
219 : }
220 : done:
221 :
222 10 : 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 10 : if (identity) {
230 10 : wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Identity from "
231 : "PAC-Opaque", identity, identity_len);
232 10 : os_free(data->identity);
233 10 : data->identity = os_malloc(identity_len);
234 10 : if (data->identity) {
235 10 : os_memcpy(data->identity, identity, identity_len);
236 10 : data->identity_len = identity_len;
237 : }
238 : }
239 :
240 10 : 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 10 : } 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 10 : eap_fast_derive_master_secret(pac_key, server_random, client_random,
259 : master_secret);
260 :
261 10 : os_free(buf);
262 :
263 10 : return 1;
264 : }
265 :
266 :
267 18 : 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 18 : sks = eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn, "key expansion",
277 : EAP_FAST_SKS_LEN);
278 18 : if (sks == NULL) {
279 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive "
280 : "session_key_seed");
281 18 : return;
282 : }
283 :
284 : /*
285 : * RFC 4851, Section 5.2:
286 : * S-IMCK[0] = session_key_seed
287 : */
288 18 : wpa_hexdump_key(MSG_DEBUG,
289 : "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
290 : sks, EAP_FAST_SKS_LEN);
291 18 : data->simck_idx = 0;
292 18 : os_memcpy(data->simck, sks, EAP_FAST_SIMCK_LEN);
293 18 : os_free(sks);
294 : }
295 :
296 :
297 5 : static void eap_fast_derive_key_provisioning(struct eap_sm *sm,
298 : struct eap_fast_data *data)
299 : {
300 5 : os_free(data->key_block_p);
301 5 : data->key_block_p = (struct eap_fast_key_block_provisioning *)
302 5 : eap_fast_derive_key(sm->ssl_ctx, data->ssl.conn,
303 : "key expansion",
304 : sizeof(*data->key_block_p));
305 5 : if (data->key_block_p == NULL) {
306 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to derive key block");
307 5 : return;
308 : }
309 : /*
310 : * RFC 4851, Section 5.2:
311 : * S-IMCK[0] = session_key_seed
312 : */
313 5 : wpa_hexdump_key(MSG_DEBUG,
314 : "EAP-FAST: session_key_seed (SKS = S-IMCK[0])",
315 5 : data->key_block_p->session_key_seed,
316 : sizeof(data->key_block_p->session_key_seed));
317 5 : data->simck_idx = 0;
318 5 : os_memcpy(data->simck, data->key_block_p->session_key_seed,
319 : EAP_FAST_SIMCK_LEN);
320 5 : wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: server_challenge",
321 5 : data->key_block_p->server_challenge,
322 : sizeof(data->key_block_p->server_challenge));
323 5 : wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: client_challenge",
324 5 : data->key_block_p->client_challenge,
325 : sizeof(data->key_block_p->client_challenge));
326 : }
327 :
328 :
329 22 : 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 22 : os_memset(isk, 0, isk_len);
337 :
338 22 : 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 22 : if (data->phase2_method->getKey == NULL)
345 7 : return 0;
346 :
347 15 : 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 15 : if (key_len > isk_len)
355 1 : key_len = isk_len;
356 30 : if (key_len == 32 &&
357 30 : data->phase2_method->vendor == EAP_VENDOR_IETF &&
358 15 : 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 14 : os_memcpy(isk, key + 16, 16);
365 14 : os_memcpy(isk + 16, key, 16);
366 : } else
367 1 : os_memcpy(isk, key, key_len);
368 15 : os_free(key);
369 :
370 15 : return 0;
371 : }
372 :
373 :
374 22 : static int eap_fast_update_icmk(struct eap_sm *sm, struct eap_fast_data *data)
375 : {
376 : u8 isk[32], imck[60];
377 :
378 22 : wpa_printf(MSG_DEBUG, "EAP-FAST: Deriving ICMK[%d] (S-IMCK and CMK)",
379 22 : 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 22 : if (eap_fast_get_phase2_key(sm, data, isk, sizeof(isk)) < 0)
390 0 : return -1;
391 22 : wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: ISK[j]", isk, sizeof(isk));
392 22 : sha1_t_prf(data->simck, EAP_FAST_SIMCK_LEN,
393 : "Inner Methods Compound Keys",
394 : isk, sizeof(isk), imck, sizeof(imck));
395 22 : data->simck_idx++;
396 22 : os_memcpy(data->simck, imck, EAP_FAST_SIMCK_LEN);
397 22 : wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: S-IMCK[j]",
398 22 : data->simck, EAP_FAST_SIMCK_LEN);
399 22 : os_memcpy(data->cmk, imck + EAP_FAST_SIMCK_LEN, EAP_FAST_CMK_LEN);
400 22 : wpa_hexdump_key(MSG_MSGDUMP, "EAP-FAST: CMK[j]",
401 22 : data->cmk, EAP_FAST_CMK_LEN);
402 :
403 22 : return 0;
404 : }
405 :
406 :
407 26 : static void * eap_fast_init(struct eap_sm *sm)
408 : {
409 : struct eap_fast_data *data;
410 26 : 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 26 : data = os_zalloc(sizeof(*data));
419 26 : if (data == NULL)
420 0 : return NULL;
421 26 : data->fast_version = EAP_FAST_VERSION;
422 26 : data->force_version = -1;
423 26 : 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 26 : data->state = START;
430 :
431 26 : if (eap_server_tls_ssl_init(sm, &data->ssl, 0, EAP_TYPE_FAST)) {
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 26 : 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 26 : 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 26 : 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 26 : os_memcpy(data->pac_opaque_encr, sm->pac_opaque_encr_key,
461 : sizeof(data->pac_opaque_encr));
462 :
463 26 : 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 26 : data->srv_id = os_malloc(sm->eap_fast_a_id_len);
469 26 : if (data->srv_id == NULL) {
470 0 : eap_fast_reset(sm, data);
471 0 : return NULL;
472 : }
473 26 : os_memcpy(data->srv_id, sm->eap_fast_a_id, sm->eap_fast_a_id_len);
474 26 : data->srv_id_len = sm->eap_fast_a_id_len;
475 :
476 26 : 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 26 : data->srv_id_info = os_strdup(sm->eap_fast_a_id_info);
482 26 : 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 26 : 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 26 : data->pac_key_refresh_time = sm->pac_key_refresh_time;
496 :
497 26 : return data;
498 : }
499 :
500 :
501 26 : static void eap_fast_reset(struct eap_sm *sm, void *priv)
502 : {
503 26 : struct eap_fast_data *data = priv;
504 26 : if (data == NULL)
505 26 : return;
506 26 : if (data->phase2_priv && data->phase2_method)
507 1 : data->phase2_method->reset(sm, data->phase2_priv);
508 26 : eap_server_tls_ssl_deinit(sm, &data->ssl);
509 26 : os_free(data->srv_id);
510 26 : os_free(data->srv_id_info);
511 26 : os_free(data->key_block_p);
512 26 : wpabuf_free(data->pending_phase2_resp);
513 26 : os_free(data->identity);
514 26 : bin_clear_free(data, sizeof(*data));
515 : }
516 :
517 :
518 26 : 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 52 : req = eap_msg_alloc(EAP_VENDOR_IETF, EAP_TYPE_FAST,
524 26 : 1 + sizeof(struct pac_tlv_hdr) + data->srv_id_len,
525 : EAP_CODE_REQUEST, id);
526 26 : 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 26 : wpabuf_put_u8(req, EAP_TLS_FLAGS_START | data->fast_version);
534 :
535 : /* RFC 4851, 4.1.1. Authority ID Data */
536 26 : eap_fast_put_tlv(req, PAC_TYPE_A_ID, data->srv_id, data->srv_id_len);
537 :
538 26 : eap_fast_state(data, PHASE1);
539 :
540 26 : return req;
541 : }
542 :
543 :
544 23 : static int eap_fast_phase1_done(struct eap_sm *sm, struct eap_fast_data *data)
545 : {
546 : char cipher[64];
547 :
548 23 : wpa_printf(MSG_DEBUG, "EAP-FAST: Phase1 done, starting Phase2");
549 :
550 23 : 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 23 : data->anon_provisioning = os_strstr(cipher, "ADH") != NULL;
558 :
559 23 : if (data->anon_provisioning) {
560 5 : wpa_printf(MSG_DEBUG, "EAP-FAST: Anonymous provisioning");
561 5 : eap_fast_derive_key_provisioning(sm, data);
562 : } else
563 18 : eap_fast_derive_key_auth(sm, data);
564 :
565 23 : eap_fast_state(data, PHASE2_START);
566 :
567 23 : return 0;
568 : }
569 :
570 :
571 59 : 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 59 : 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 59 : req = data->phase2_method->buildReq(sm, data->phase2_priv, id);
583 59 : if (req == NULL)
584 0 : return NULL;
585 :
586 59 : wpa_hexdump_buf_key(MSG_MSGDUMP, "EAP-FAST: Phase 2 EAP-Request", req);
587 59 : return eap_fast_tlv_eap_payload(req);
588 : }
589 :
590 :
591 22 : 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 22 : buf = wpabuf_alloc(2 * sizeof(*result) + sizeof(*binding));
599 22 : if (buf == NULL)
600 0 : return NULL;
601 :
602 39 : if (data->send_new_pac || data->anon_provisioning ||
603 17 : data->phase2_method)
604 6 : data->final_result = 0;
605 : else
606 16 : data->final_result = 1;
607 :
608 22 : if (!data->final_result || data->eap_seq > 1) {
609 : /* Intermediate-Result */
610 7 : wpa_printf(MSG_DEBUG, "EAP-FAST: Add Intermediate-Result TLV "
611 : "(status=SUCCESS)");
612 7 : result = wpabuf_put(buf, sizeof(*result));
613 7 : result->tlv_type = host_to_be16(
614 : EAP_TLV_TYPE_MANDATORY |
615 : EAP_TLV_INTERMEDIATE_RESULT_TLV);
616 7 : result->length = host_to_be16(2);
617 7 : result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
618 : }
619 :
620 22 : if (data->final_result) {
621 : /* Result TLV */
622 16 : wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV "
623 : "(status=SUCCESS)");
624 16 : result = wpabuf_put(buf, sizeof(*result));
625 16 : result->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
626 : EAP_TLV_RESULT_TLV);
627 16 : result->length = host_to_be16(2);
628 16 : result->status = host_to_be16(EAP_TLV_RESULT_SUCCESS);
629 : }
630 :
631 : /* Crypto-Binding TLV */
632 22 : binding = wpabuf_put(buf, sizeof(*binding));
633 22 : binding->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
634 : EAP_TLV_CRYPTO_BINDING_TLV);
635 22 : binding->length = host_to_be16(sizeof(*binding) -
636 : sizeof(struct eap_tlv_hdr));
637 22 : binding->version = EAP_FAST_VERSION;
638 22 : binding->received_version = data->peer_version;
639 22 : binding->subtype = EAP_TLV_CRYPTO_BINDING_SUBTYPE_REQUEST;
640 22 : 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 22 : binding->nonce[sizeof(binding->nonce) - 1] &= ~0x01;
650 :
651 22 : 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 22 : hmac_sha1(data->cmk, EAP_FAST_CMK_LEN,
661 : (u8 *) binding, sizeof(*binding),
662 22 : binding->compound_mac);
663 :
664 66 : wpa_printf(MSG_DEBUG, "EAP-FAST: Add Crypto-Binding TLV: Version %d "
665 : "Received Version %d SubType %d",
666 44 : binding->version, binding->received_version,
667 22 : binding->subtype);
668 22 : wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
669 22 : binding->nonce, sizeof(binding->nonce));
670 22 : wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
671 22 : binding->compound_mac, sizeof(binding->compound_mac));
672 :
673 22 : return buf;
674 : }
675 :
676 :
677 12 : 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 24 : if (random_get_bytes(pac_key, EAP_FAST_PAC_KEY_LEN) < 0 ||
691 12 : os_get_time(&now) < 0)
692 0 : return NULL;
693 12 : wpa_hexdump_key(MSG_DEBUG, "EAP-FAST: Generated PAC-Key",
694 : pac_key, EAP_FAST_PAC_KEY_LEN);
695 :
696 12 : pac_len = (2 + EAP_FAST_PAC_KEY_LEN) + (2 + 4) +
697 12 : (2 + sm->identity_len) + 8;
698 12 : pac_buf = os_malloc(pac_len);
699 12 : if (pac_buf == NULL)
700 0 : return NULL;
701 :
702 12 : srv_id_info_len = os_strlen(data->srv_id_info);
703 :
704 12 : pos = pac_buf;
705 12 : *pos++ = PAC_OPAQUE_TYPE_KEY;
706 12 : *pos++ = EAP_FAST_PAC_KEY_LEN;
707 12 : os_memcpy(pos, pac_key, EAP_FAST_PAC_KEY_LEN);
708 12 : pos += EAP_FAST_PAC_KEY_LEN;
709 :
710 12 : *pos++ = PAC_OPAQUE_TYPE_LIFETIME;
711 12 : *pos++ = 4;
712 12 : WPA_PUT_BE32(pos, now.sec + data->pac_key_lifetime);
713 12 : pos += 4;
714 :
715 12 : if (sm->identity) {
716 12 : *pos++ = PAC_OPAQUE_TYPE_IDENTITY;
717 12 : *pos++ = sm->identity_len;
718 12 : os_memcpy(pos, sm->identity, sm->identity_len);
719 12 : pos += sm->identity_len;
720 : }
721 :
722 12 : pac_len = pos - pac_buf;
723 47 : while (pac_len % 8) {
724 23 : *pos++ = PAC_OPAQUE_TYPE_PAD;
725 23 : pac_len++;
726 : }
727 :
728 12 : pac_opaque = os_malloc(pac_len + 8);
729 12 : if (pac_opaque == NULL) {
730 0 : os_free(pac_buf);
731 0 : return NULL;
732 : }
733 12 : if (aes_wrap(data->pac_opaque_encr, sizeof(data->pac_opaque_encr),
734 12 : pac_len / 8, pac_buf, pac_opaque) < 0) {
735 0 : os_free(pac_buf);
736 0 : os_free(pac_opaque);
737 0 : return NULL;
738 : }
739 12 : os_free(pac_buf);
740 :
741 12 : pac_len += 8;
742 12 : wpa_hexdump(MSG_DEBUG, "EAP-FAST: PAC-Opaque",
743 : pac_opaque, pac_len);
744 :
745 12 : buf_len = sizeof(*pac_tlv) +
746 : sizeof(struct pac_tlv_hdr) + EAP_FAST_PAC_KEY_LEN +
747 12 : sizeof(struct pac_tlv_hdr) + pac_len +
748 24 : data->srv_id_len + srv_id_info_len + 100 + sizeof(*result);
749 12 : buf = wpabuf_alloc(buf_len);
750 12 : if (buf == NULL) {
751 0 : os_free(pac_opaque);
752 0 : return NULL;
753 : }
754 :
755 : /* Result TLV */
756 12 : wpa_printf(MSG_DEBUG, "EAP-FAST: Add Result TLV (status=SUCCESS)");
757 12 : result = wpabuf_put(buf, sizeof(*result));
758 12 : WPA_PUT_BE16((u8 *) &result->tlv_type,
759 : EAP_TLV_TYPE_MANDATORY | EAP_TLV_RESULT_TLV);
760 12 : WPA_PUT_BE16((u8 *) &result->length, 2);
761 12 : WPA_PUT_BE16((u8 *) &result->status, EAP_TLV_RESULT_SUCCESS);
762 :
763 : /* PAC TLV */
764 12 : wpa_printf(MSG_DEBUG, "EAP-FAST: Add PAC TLV");
765 12 : pac_tlv = wpabuf_put(buf, sizeof(*pac_tlv));
766 12 : pac_tlv->tlv_type = host_to_be16(EAP_TLV_TYPE_MANDATORY |
767 : EAP_TLV_PAC_TLV);
768 :
769 : /* PAC-Key */
770 12 : eap_fast_put_tlv(buf, PAC_TYPE_PAC_KEY, pac_key, EAP_FAST_PAC_KEY_LEN);
771 :
772 : /* PAC-Opaque */
773 12 : eap_fast_put_tlv(buf, PAC_TYPE_PAC_OPAQUE, pac_opaque, pac_len);
774 12 : os_free(pac_opaque);
775 :
776 : /* PAC-Info */
777 12 : pac_info = wpabuf_put(buf, sizeof(*pac_info));
778 12 : pac_info->type = host_to_be16(PAC_TYPE_PAC_INFO);
779 :
780 : /* PAC-Lifetime (inside PAC-Info) */
781 12 : eap_fast_put_tlv_hdr(buf, PAC_TYPE_CRED_LIFETIME, 4);
782 12 : wpabuf_put_be32(buf, now.sec + data->pac_key_lifetime);
783 :
784 : /* A-ID (inside PAC-Info) */
785 12 : 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 12 : if (sm->identity) {
790 12 : eap_fast_put_tlv(buf, PAC_TYPE_I_ID, sm->identity,
791 12 : sm->identity_len);
792 : }
793 :
794 : /* A-ID-Info (inside PAC-Info) */
795 12 : 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 12 : eap_fast_put_tlv_hdr(buf, PAC_TYPE_PAC_TYPE, 2);
800 12 : wpabuf_put_be16(buf, PAC_TYPE_TUNNEL_PAC);
801 :
802 : /* Update PAC-Info and PAC TLV Length fields */
803 12 : pos = wpabuf_put(buf, 0);
804 12 : pac_info->len = host_to_be16(pos - (u8 *) (pac_info + 1));
805 12 : pac_tlv->length = host_to_be16(pos - (u8 *) (pac_tlv + 1));
806 :
807 12 : return buf;
808 : }
809 :
810 :
811 92 : 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 92 : wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Encrypting Phase 2 TLVs",
818 : plain);
819 92 : encr = eap_server_tls_encrypt(sm, &data->ssl, plain);
820 92 : wpabuf_free(plain);
821 :
822 92 : if (!encr)
823 0 : return -1;
824 :
825 92 : if (data->ssl.tls_out && piggyback) {
826 39 : wpa_printf(MSG_DEBUG, "EAP-FAST: Piggyback Phase 2 data "
827 : "(len=%d) with last Phase 1 Message (len=%d "
828 : "used=%d)",
829 13 : (int) wpabuf_len(encr),
830 13 : (int) wpabuf_len(data->ssl.tls_out),
831 13 : (int) data->ssl.tls_out_pos);
832 13 : if (wpabuf_resize(&data->ssl.tls_out, wpabuf_len(encr)) < 0) {
833 0 : wpa_printf(MSG_WARNING, "EAP-FAST: Failed to resize "
834 : "output buffer");
835 0 : wpabuf_free(encr);
836 0 : return -1;
837 : }
838 13 : wpabuf_put_buf(data->ssl.tls_out, encr);
839 13 : wpabuf_free(encr);
840 : } else {
841 79 : wpabuf_free(data->ssl.tls_out);
842 79 : data->ssl.tls_out_pos = 0;
843 79 : data->ssl.tls_out = encr;
844 : }
845 :
846 92 : return 0;
847 : }
848 :
849 :
850 148 : static struct wpabuf * eap_fast_buildReq(struct eap_sm *sm, void *priv, u8 id)
851 : {
852 148 : struct eap_fast_data *data = priv;
853 148 : struct wpabuf *req = NULL;
854 148 : int piggyback = 0;
855 :
856 148 : if (data->ssl.state == FRAG_ACK) {
857 0 : return eap_server_tls_build_ack(id, EAP_TYPE_FAST,
858 : data->fast_version);
859 : }
860 :
861 148 : if (data->ssl.state == WAIT_FRAG_ACK) {
862 7 : return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
863 : data->fast_version, id);
864 : }
865 :
866 141 : switch (data->state) {
867 : case START:
868 26 : return eap_fast_build_start(sm, data, id);
869 : case PHASE1:
870 36 : if (tls_connection_established(sm->ssl_ctx, data->ssl.conn)) {
871 13 : if (eap_fast_phase1_done(sm, data) < 0)
872 0 : return NULL;
873 13 : if (data->state == PHASE2_START) {
874 : /*
875 : * Try to generate Phase 2 data to piggyback
876 : * with the end of Phase 1 to avoid extra
877 : * roundtrip.
878 : */
879 13 : wpa_printf(MSG_DEBUG, "EAP-FAST: Try to start "
880 : "Phase 2");
881 13 : if (eap_fast_process_phase2_start(sm, data))
882 0 : break;
883 13 : req = eap_fast_build_phase2_req(sm, data, id);
884 13 : piggyback = 1;
885 : }
886 : }
887 36 : break;
888 : case PHASE2_ID:
889 : case PHASE2_METHOD:
890 45 : req = eap_fast_build_phase2_req(sm, data, id);
891 45 : break;
892 : case CRYPTO_BINDING:
893 22 : req = eap_fast_build_crypto_binding(sm, data);
894 22 : if (data->phase2_method) {
895 : /*
896 : * Include the start of the next EAP method in the
897 : * sequence in the same message with Crypto-Binding to
898 : * save a round-trip.
899 : */
900 : struct wpabuf *eap;
901 1 : eap = eap_fast_build_phase2_req(sm, data, id);
902 1 : req = wpabuf_concat(req, eap);
903 1 : eap_fast_state(data, PHASE2_METHOD);
904 : }
905 22 : break;
906 : case REQUEST_PAC:
907 12 : req = eap_fast_build_pac(sm, data);
908 12 : break;
909 : default:
910 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
911 0 : __func__, data->state);
912 0 : return NULL;
913 : }
914 :
915 207 : if (req &&
916 92 : eap_fast_encrypt_phase2(sm, data, req, piggyback) < 0)
917 0 : return NULL;
918 :
919 115 : return eap_server_tls_build_msg(&data->ssl, EAP_TYPE_FAST,
920 : data->fast_version, id);
921 : }
922 :
923 :
924 145 : static Boolean eap_fast_check(struct eap_sm *sm, void *priv,
925 : struct wpabuf *respData)
926 : {
927 : const u8 *pos;
928 : size_t len;
929 :
930 145 : pos = eap_hdr_validate(EAP_VENDOR_IETF, EAP_TYPE_FAST, respData, &len);
931 145 : if (pos == NULL || len < 1) {
932 0 : wpa_printf(MSG_INFO, "EAP-FAST: Invalid frame");
933 0 : return TRUE;
934 : }
935 :
936 145 : return FALSE;
937 : }
938 :
939 :
940 64 : static int eap_fast_phase2_init(struct eap_sm *sm, struct eap_fast_data *data,
941 : EapType eap_type)
942 : {
943 64 : if (data->phase2_priv && data->phase2_method) {
944 41 : data->phase2_method->reset(sm, data->phase2_priv);
945 41 : data->phase2_method = NULL;
946 41 : data->phase2_priv = NULL;
947 : }
948 64 : data->phase2_method = eap_server_get_eap_method(EAP_VENDOR_IETF,
949 : eap_type);
950 64 : if (!data->phase2_method)
951 22 : return -1;
952 :
953 42 : if (data->key_block_p) {
954 10 : sm->auth_challenge = data->key_block_p->server_challenge;
955 10 : sm->peer_challenge = data->key_block_p->client_challenge;
956 : }
957 42 : sm->init_phase2 = 1;
958 42 : data->phase2_priv = data->phase2_method->init(sm);
959 42 : sm->init_phase2 = 0;
960 42 : sm->auth_challenge = NULL;
961 42 : sm->peer_challenge = NULL;
962 :
963 42 : return data->phase2_priv == NULL ? -1 : 0;
964 : }
965 :
966 :
967 59 : static void eap_fast_process_phase2_response(struct eap_sm *sm,
968 : struct eap_fast_data *data,
969 : u8 *in_data, size_t in_len)
970 : {
971 59 : u8 next_type = EAP_TYPE_NONE;
972 : struct eap_hdr *hdr;
973 : u8 *pos;
974 : size_t left;
975 : struct wpabuf buf;
976 59 : const struct eap_method *m = data->phase2_method;
977 59 : void *priv = data->phase2_priv;
978 :
979 59 : if (priv == NULL) {
980 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: %s - Phase2 not "
981 : "initialized?!", __func__);
982 0 : return;
983 : }
984 :
985 59 : hdr = (struct eap_hdr *) in_data;
986 59 : pos = (u8 *) (hdr + 1);
987 :
988 59 : if (in_len > sizeof(*hdr) && *pos == EAP_TYPE_NAK) {
989 6 : left = in_len - sizeof(*hdr);
990 6 : wpa_hexdump(MSG_DEBUG, "EAP-FAST: Phase2 type Nak'ed; "
991 : "allowed types", pos + 1, left - 1);
992 : #ifdef EAP_SERVER_TNC
993 12 : if (m && m->vendor == EAP_VENDOR_IETF &&
994 6 : m->method == EAP_TYPE_TNC) {
995 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Peer Nak'ed required "
996 : "TNC negotiation");
997 0 : next_type = eap_fast_req_failure(sm, data);
998 0 : eap_fast_phase2_init(sm, data, next_type);
999 0 : return;
1000 : }
1001 : #endif /* EAP_SERVER_TNC */
1002 6 : eap_sm_process_nak(sm, pos + 1, left - 1);
1003 12 : if (sm->user && sm->user_eap_method_index < EAP_MAX_METHODS &&
1004 6 : sm->user->methods[sm->user_eap_method_index].method !=
1005 : EAP_TYPE_NONE) {
1006 12 : next_type = sm->user->methods[
1007 6 : sm->user_eap_method_index++].method;
1008 6 : wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d",
1009 : next_type);
1010 : } else {
1011 0 : next_type = eap_fast_req_failure(sm, data);
1012 : }
1013 6 : eap_fast_phase2_init(sm, data, next_type);
1014 6 : return;
1015 : }
1016 :
1017 53 : wpabuf_set(&buf, in_data, in_len);
1018 :
1019 53 : if (m->check(sm, priv, &buf)) {
1020 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 check() asked to "
1021 : "ignore the packet");
1022 0 : eap_fast_req_failure(sm, data);
1023 0 : return;
1024 : }
1025 :
1026 53 : m->process(sm, priv, &buf);
1027 :
1028 53 : if (!m->isDone(sm, priv))
1029 18 : return;
1030 :
1031 35 : if (!m->isSuccess(sm, priv)) {
1032 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method failed");
1033 1 : next_type = eap_fast_req_failure(sm, data);
1034 1 : eap_fast_phase2_init(sm, data, next_type);
1035 1 : return;
1036 : }
1037 :
1038 34 : switch (data->state) {
1039 : case PHASE2_ID:
1040 12 : if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1041 0 : wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: Phase2 "
1042 : "Identity not found in the user "
1043 : "database",
1044 0 : sm->identity, sm->identity_len);
1045 0 : next_type = eap_fast_req_failure(sm, data);
1046 0 : break;
1047 : }
1048 :
1049 12 : eap_fast_state(data, PHASE2_METHOD);
1050 12 : if (data->anon_provisioning) {
1051 : /*
1052 : * Only EAP-MSCHAPv2 is allowed for anonymous
1053 : * provisioning.
1054 : */
1055 5 : next_type = EAP_TYPE_MSCHAPV2;
1056 5 : sm->user_eap_method_index = 0;
1057 : } else {
1058 7 : next_type = sm->user->methods[0].method;
1059 7 : sm->user_eap_method_index = 1;
1060 : }
1061 12 : wpa_printf(MSG_DEBUG, "EAP-FAST: try EAP type %d", next_type);
1062 12 : break;
1063 : case PHASE2_METHOD:
1064 : case CRYPTO_BINDING:
1065 22 : eap_fast_update_icmk(sm, data);
1066 22 : eap_fast_state(data, CRYPTO_BINDING);
1067 22 : data->eap_seq++;
1068 22 : next_type = EAP_TYPE_NONE;
1069 : #ifdef EAP_SERVER_TNC
1070 22 : if (sm->tnc && !data->tnc_started) {
1071 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: Initialize TNC");
1072 1 : next_type = EAP_TYPE_TNC;
1073 1 : data->tnc_started = 1;
1074 : }
1075 : #endif /* EAP_SERVER_TNC */
1076 22 : break;
1077 : case FAILURE:
1078 0 : break;
1079 : default:
1080 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: %s - unexpected state %d",
1081 0 : __func__, data->state);
1082 0 : break;
1083 : }
1084 :
1085 34 : eap_fast_phase2_init(sm, data, next_type);
1086 : }
1087 :
1088 :
1089 59 : static void eap_fast_process_phase2_eap(struct eap_sm *sm,
1090 : struct eap_fast_data *data,
1091 : u8 *in_data, size_t in_len)
1092 : {
1093 : struct eap_hdr *hdr;
1094 : size_t len;
1095 :
1096 59 : hdr = (struct eap_hdr *) in_data;
1097 59 : if (in_len < (int) sizeof(*hdr)) {
1098 0 : wpa_printf(MSG_INFO, "EAP-FAST: Too short Phase 2 "
1099 : "EAP frame (len=%lu)", (unsigned long) in_len);
1100 0 : eap_fast_req_failure(sm, data);
1101 0 : return;
1102 : }
1103 59 : len = be_to_host16(hdr->length);
1104 59 : if (len > in_len) {
1105 0 : wpa_printf(MSG_INFO, "EAP-FAST: Length mismatch in "
1106 : "Phase 2 EAP frame (len=%lu hdr->length=%lu)",
1107 : (unsigned long) in_len, (unsigned long) len);
1108 0 : eap_fast_req_failure(sm, data);
1109 0 : return;
1110 : }
1111 118 : wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: code=%d "
1112 118 : "identifier=%d length=%lu", hdr->code, hdr->identifier,
1113 : (unsigned long) len);
1114 59 : switch (hdr->code) {
1115 : case EAP_CODE_RESPONSE:
1116 59 : eap_fast_process_phase2_response(sm, data, (u8 *) hdr, len);
1117 59 : break;
1118 : default:
1119 0 : wpa_printf(MSG_INFO, "EAP-FAST: Unexpected code=%d in "
1120 0 : "Phase 2 EAP header", hdr->code);
1121 0 : break;
1122 : }
1123 : }
1124 :
1125 :
1126 92 : static int eap_fast_parse_tlvs(struct wpabuf *data,
1127 : struct eap_fast_tlv_parse *tlv)
1128 : {
1129 : int mandatory, tlv_type, res;
1130 : size_t len;
1131 : u8 *pos, *end;
1132 :
1133 92 : os_memset(tlv, 0, sizeof(*tlv));
1134 :
1135 92 : pos = wpabuf_mhead(data);
1136 92 : end = pos + wpabuf_len(data);
1137 328 : while (pos + 4 < end) {
1138 144 : mandatory = pos[0] & 0x80;
1139 144 : tlv_type = WPA_GET_BE16(pos) & 0x3fff;
1140 144 : pos += 2;
1141 144 : len = WPA_GET_BE16(pos);
1142 144 : pos += 2;
1143 144 : if (len > (size_t) (end - pos)) {
1144 0 : wpa_printf(MSG_INFO, "EAP-FAST: TLV overflow");
1145 0 : return -1;
1146 : }
1147 144 : wpa_printf(MSG_DEBUG, "EAP-FAST: Received Phase 2: "
1148 : "TLV type %d length %u%s",
1149 : tlv_type, (unsigned int) len,
1150 : mandatory ? " (mandatory)" : "");
1151 :
1152 144 : res = eap_fast_parse_tlv(tlv, tlv_type, pos, len);
1153 144 : if (res == -2)
1154 0 : break;
1155 144 : if (res < 0) {
1156 0 : if (mandatory) {
1157 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Nak unknown "
1158 : "mandatory TLV type %d", tlv_type);
1159 : /* TODO: generate Nak TLV */
1160 0 : break;
1161 : } else {
1162 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Ignored "
1163 : "unknown optional TLV type %d",
1164 : tlv_type);
1165 : }
1166 : }
1167 :
1168 144 : pos += len;
1169 : }
1170 :
1171 92 : return 0;
1172 : }
1173 :
1174 :
1175 21 : static int eap_fast_validate_crypto_binding(
1176 : struct eap_fast_data *data, struct eap_tlv_crypto_binding_tlv *b,
1177 : size_t bind_len)
1178 : {
1179 : u8 cmac[SHA1_MAC_LEN];
1180 :
1181 63 : wpa_printf(MSG_DEBUG, "EAP-FAST: Reply Crypto-Binding TLV: "
1182 : "Version %d Received Version %d SubType %d",
1183 63 : b->version, b->received_version, b->subtype);
1184 21 : wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: NONCE",
1185 21 : b->nonce, sizeof(b->nonce));
1186 21 : wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Compound MAC",
1187 21 : b->compound_mac, sizeof(b->compound_mac));
1188 :
1189 42 : if (b->version != EAP_FAST_VERSION ||
1190 21 : b->received_version != EAP_FAST_VERSION) {
1191 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected version "
1192 : "in Crypto-Binding: version %d "
1193 0 : "received_version %d", b->version,
1194 0 : b->received_version);
1195 0 : return -1;
1196 : }
1197 :
1198 21 : if (b->subtype != EAP_TLV_CRYPTO_BINDING_SUBTYPE_RESPONSE) {
1199 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected subtype in "
1200 0 : "Crypto-Binding: %d", b->subtype);
1201 0 : return -1;
1202 : }
1203 :
1204 42 : if (os_memcmp_const(data->crypto_binding_nonce, b->nonce, 31) != 0 ||
1205 21 : (data->crypto_binding_nonce[31] | 1) != b->nonce[31]) {
1206 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Invalid nonce in "
1207 : "Crypto-Binding");
1208 0 : return -1;
1209 : }
1210 :
1211 21 : os_memcpy(cmac, b->compound_mac, sizeof(cmac));
1212 21 : os_memset(b->compound_mac, 0, sizeof(cmac));
1213 21 : wpa_hexdump(MSG_MSGDUMP, "EAP-FAST: Crypto-Binding TLV for "
1214 : "Compound MAC calculation",
1215 : (u8 *) b, bind_len);
1216 21 : hmac_sha1(data->cmk, EAP_FAST_CMK_LEN, (u8 *) b, bind_len,
1217 21 : b->compound_mac);
1218 21 : if (os_memcmp_const(cmac, b->compound_mac, sizeof(cmac)) != 0) {
1219 0 : wpa_hexdump(MSG_MSGDUMP,
1220 : "EAP-FAST: Calculated Compound MAC",
1221 0 : b->compound_mac, sizeof(cmac));
1222 0 : wpa_printf(MSG_INFO, "EAP-FAST: Compound MAC did not "
1223 : "match");
1224 0 : return -1;
1225 : }
1226 :
1227 21 : return 0;
1228 : }
1229 :
1230 :
1231 7 : static int eap_fast_pac_type(u8 *pac, size_t len, u16 type)
1232 : {
1233 : struct eap_tlv_pac_type_tlv *tlv;
1234 :
1235 7 : if (pac == NULL || len != sizeof(*tlv))
1236 0 : return 0;
1237 :
1238 7 : tlv = (struct eap_tlv_pac_type_tlv *) pac;
1239 :
1240 21 : return be_to_host16(tlv->tlv_type) == PAC_TYPE_PAC_TYPE &&
1241 14 : be_to_host16(tlv->length) == 2 &&
1242 7 : be_to_host16(tlv->pac_type) == type;
1243 : }
1244 :
1245 :
1246 92 : static void eap_fast_process_phase2_tlvs(struct eap_sm *sm,
1247 : struct eap_fast_data *data,
1248 : struct wpabuf *in_data)
1249 : {
1250 : struct eap_fast_tlv_parse tlv;
1251 92 : int check_crypto_binding = data->state == CRYPTO_BINDING;
1252 :
1253 92 : if (eap_fast_parse_tlvs(in_data, &tlv) < 0) {
1254 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Failed to parse received "
1255 : "Phase 2 TLVs");
1256 0 : return;
1257 : }
1258 :
1259 92 : if (tlv.result == EAP_TLV_RESULT_FAILURE) {
1260 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Result TLV indicated "
1261 : "failure");
1262 0 : eap_fast_state(data, FAILURE);
1263 0 : return;
1264 : }
1265 :
1266 92 : if (data->state == REQUEST_PAC) {
1267 : u16 type, len, res;
1268 12 : if (tlv.pac == NULL || tlv.pac_len < 6) {
1269 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: No PAC "
1270 : "Acknowledgement received");
1271 0 : eap_fast_state(data, FAILURE);
1272 0 : return;
1273 : }
1274 :
1275 12 : type = WPA_GET_BE16(tlv.pac);
1276 12 : len = WPA_GET_BE16(tlv.pac + 2);
1277 12 : res = WPA_GET_BE16(tlv.pac + 4);
1278 :
1279 12 : if (type != PAC_TYPE_PAC_ACKNOWLEDGEMENT || len != 2 ||
1280 : res != EAP_TLV_RESULT_SUCCESS) {
1281 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: PAC TLV did not "
1282 : "contain acknowledgement");
1283 0 : eap_fast_state(data, FAILURE);
1284 0 : return;
1285 : }
1286 :
1287 12 : wpa_printf(MSG_DEBUG, "EAP-FAST: PAC-Acknowledgement received "
1288 : "- PAC provisioning succeeded");
1289 19 : eap_fast_state(data, (data->anon_provisioning ||
1290 7 : data->send_new_pac == 2) ?
1291 : FAILURE : SUCCESS);
1292 12 : return;
1293 : }
1294 :
1295 80 : if (check_crypto_binding) {
1296 21 : if (tlv.crypto_binding == NULL) {
1297 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: No Crypto-Binding "
1298 : "TLV received");
1299 0 : eap_fast_state(data, FAILURE);
1300 0 : return;
1301 : }
1302 :
1303 37 : if (data->final_result &&
1304 16 : tlv.result != EAP_TLV_RESULT_SUCCESS) {
1305 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1306 : "without Success Result");
1307 0 : eap_fast_state(data, FAILURE);
1308 0 : return;
1309 : }
1310 :
1311 26 : if (!data->final_result &&
1312 5 : tlv.iresult != EAP_TLV_RESULT_SUCCESS) {
1313 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Crypto-Binding TLV "
1314 : "without intermediate Success Result");
1315 0 : eap_fast_state(data, FAILURE);
1316 0 : return;
1317 : }
1318 :
1319 21 : if (eap_fast_validate_crypto_binding(data, tlv.crypto_binding,
1320 : tlv.crypto_binding_len)) {
1321 0 : eap_fast_state(data, FAILURE);
1322 0 : return;
1323 : }
1324 :
1325 21 : wpa_printf(MSG_DEBUG, "EAP-FAST: Valid Crypto-Binding TLV "
1326 : "received");
1327 21 : if (data->final_result) {
1328 16 : wpa_printf(MSG_DEBUG, "EAP-FAST: Authentication "
1329 : "completed successfully");
1330 : }
1331 :
1332 26 : if (data->anon_provisioning &&
1333 10 : sm->eap_fast_prov != ANON_PROV &&
1334 5 : sm->eap_fast_prov != BOTH_PROV) {
1335 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1336 : "use unauthenticated provisioning which is "
1337 : "disabled");
1338 0 : eap_fast_state(data, FAILURE);
1339 0 : return;
1340 : }
1341 :
1342 42 : if (sm->eap_fast_prov != AUTH_PROV &&
1343 21 : sm->eap_fast_prov != BOTH_PROV &&
1344 0 : tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1345 0 : eap_fast_pac_type(tlv.pac, tlv.pac_len,
1346 : PAC_TYPE_TUNNEL_PAC)) {
1347 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Client is trying to "
1348 : "use authenticated provisioning which is "
1349 : "disabled");
1350 0 : eap_fast_state(data, FAILURE);
1351 0 : return;
1352 : }
1353 :
1354 37 : if (data->anon_provisioning ||
1355 23 : (tlv.request_action == EAP_TLV_ACTION_PROCESS_TLV &&
1356 7 : eap_fast_pac_type(tlv.pac, tlv.pac_len,
1357 : PAC_TYPE_TUNNEL_PAC))) {
1358 12 : wpa_printf(MSG_DEBUG, "EAP-FAST: Requested a new "
1359 : "Tunnel PAC");
1360 12 : eap_fast_state(data, REQUEST_PAC);
1361 9 : } else if (data->send_new_pac) {
1362 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Server triggered "
1363 : "re-keying of Tunnel PAC");
1364 0 : eap_fast_state(data, REQUEST_PAC);
1365 9 : } else if (data->final_result)
1366 9 : eap_fast_state(data, SUCCESS);
1367 : }
1368 :
1369 80 : if (tlv.eap_payload_tlv) {
1370 59 : eap_fast_process_phase2_eap(sm, data, tlv.eap_payload_tlv,
1371 : tlv.eap_payload_tlv_len);
1372 : }
1373 : }
1374 :
1375 :
1376 92 : static void eap_fast_process_phase2(struct eap_sm *sm,
1377 : struct eap_fast_data *data,
1378 : struct wpabuf *in_buf)
1379 : {
1380 : struct wpabuf *in_decrypted;
1381 :
1382 92 : wpa_printf(MSG_DEBUG, "EAP-FAST: Received %lu bytes encrypted data for"
1383 : " Phase 2", (unsigned long) wpabuf_len(in_buf));
1384 :
1385 92 : if (data->pending_phase2_resp) {
1386 1 : wpa_printf(MSG_DEBUG, "EAP-PEAP: Pending Phase 2 response - "
1387 : "skip decryption and use old data");
1388 1 : eap_fast_process_phase2_tlvs(sm, data,
1389 : data->pending_phase2_resp);
1390 1 : wpabuf_free(data->pending_phase2_resp);
1391 1 : data->pending_phase2_resp = NULL;
1392 1 : return;
1393 : }
1394 :
1395 91 : in_decrypted = tls_connection_decrypt(sm->ssl_ctx, data->ssl.conn,
1396 : in_buf);
1397 91 : if (in_decrypted == NULL) {
1398 0 : wpa_printf(MSG_INFO, "EAP-FAST: Failed to decrypt Phase 2 "
1399 : "data");
1400 0 : eap_fast_state(data, FAILURE);
1401 0 : return;
1402 : }
1403 :
1404 91 : wpa_hexdump_buf_key(MSG_DEBUG, "EAP-FAST: Decrypted Phase 2 TLVs",
1405 : in_decrypted);
1406 :
1407 91 : eap_fast_process_phase2_tlvs(sm, data, in_decrypted);
1408 :
1409 91 : if (sm->method_pending == METHOD_PENDING_WAIT) {
1410 1 : wpa_printf(MSG_DEBUG, "EAP-FAST: Phase2 method is in "
1411 : "pending wait state - save decrypted response");
1412 1 : wpabuf_free(data->pending_phase2_resp);
1413 1 : data->pending_phase2_resp = in_decrypted;
1414 1 : return;
1415 : }
1416 :
1417 90 : wpabuf_free(in_decrypted);
1418 : }
1419 :
1420 :
1421 146 : static int eap_fast_process_version(struct eap_sm *sm, void *priv,
1422 : int peer_version)
1423 : {
1424 146 : struct eap_fast_data *data = priv;
1425 :
1426 146 : data->peer_version = peer_version;
1427 :
1428 146 : if (data->force_version >= 0 && peer_version != data->force_version) {
1429 0 : wpa_printf(MSG_INFO, "EAP-FAST: peer did not select the forced"
1430 : " version (forced=%d peer=%d) - reject",
1431 : data->force_version, peer_version);
1432 0 : return -1;
1433 : }
1434 :
1435 146 : if (peer_version < data->fast_version) {
1436 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: peer ver=%d, own ver=%d; "
1437 : "use version %d",
1438 : peer_version, data->fast_version, peer_version);
1439 0 : data->fast_version = peer_version;
1440 : }
1441 :
1442 146 : return 0;
1443 : }
1444 :
1445 :
1446 47 : static int eap_fast_process_phase1(struct eap_sm *sm,
1447 : struct eap_fast_data *data)
1448 : {
1449 47 : if (eap_server_tls_phase1(sm, &data->ssl) < 0) {
1450 1 : wpa_printf(MSG_INFO, "EAP-FAST: TLS processing failed");
1451 1 : eap_fast_state(data, FAILURE);
1452 1 : return -1;
1453 : }
1454 :
1455 69 : if (!tls_connection_established(sm->ssl_ctx, data->ssl.conn) ||
1456 23 : wpabuf_len(data->ssl.tls_out) > 0)
1457 36 : return 1;
1458 :
1459 : /*
1460 : * Phase 1 was completed with the received message (e.g., when using
1461 : * abbreviated handshake), so Phase 2 can be started immediately
1462 : * without having to send through an empty message to the peer.
1463 : */
1464 :
1465 10 : return eap_fast_phase1_done(sm, data);
1466 : }
1467 :
1468 :
1469 23 : static int eap_fast_process_phase2_start(struct eap_sm *sm,
1470 : struct eap_fast_data *data)
1471 : {
1472 : u8 next_type;
1473 :
1474 23 : if (data->identity) {
1475 10 : os_free(sm->identity);
1476 10 : sm->identity = data->identity;
1477 10 : data->identity = NULL;
1478 10 : sm->identity_len = data->identity_len;
1479 10 : data->identity_len = 0;
1480 10 : sm->require_identity_match = 1;
1481 10 : if (eap_user_get(sm, sm->identity, sm->identity_len, 1) != 0) {
1482 0 : wpa_hexdump_ascii(MSG_DEBUG, "EAP-FAST: "
1483 : "Phase2 Identity not found "
1484 : "in the user database",
1485 0 : sm->identity, sm->identity_len);
1486 0 : next_type = eap_fast_req_failure(sm, data);
1487 : } else {
1488 10 : wpa_printf(MSG_DEBUG, "EAP-FAST: Identity already "
1489 : "known - skip Phase 2 Identity Request");
1490 10 : next_type = sm->user->methods[0].method;
1491 10 : sm->user_eap_method_index = 1;
1492 : }
1493 :
1494 10 : eap_fast_state(data, PHASE2_METHOD);
1495 : } else {
1496 13 : eap_fast_state(data, PHASE2_ID);
1497 13 : next_type = EAP_TYPE_IDENTITY;
1498 : }
1499 :
1500 23 : return eap_fast_phase2_init(sm, data, next_type);
1501 : }
1502 :
1503 :
1504 139 : static void eap_fast_process_msg(struct eap_sm *sm, void *priv,
1505 : const struct wpabuf *respData)
1506 : {
1507 139 : struct eap_fast_data *data = priv;
1508 :
1509 139 : switch (data->state) {
1510 : case PHASE1:
1511 47 : if (eap_fast_process_phase1(sm, data))
1512 37 : break;
1513 :
1514 : /* fall through to PHASE2_START */
1515 : case PHASE2_START:
1516 10 : eap_fast_process_phase2_start(sm, data);
1517 10 : break;
1518 : case PHASE2_ID:
1519 : case PHASE2_METHOD:
1520 : case CRYPTO_BINDING:
1521 : case REQUEST_PAC:
1522 92 : eap_fast_process_phase2(sm, data, data->ssl.tls_in);
1523 92 : break;
1524 : default:
1525 0 : wpa_printf(MSG_DEBUG, "EAP-FAST: Unexpected state %d in %s",
1526 0 : data->state, __func__);
1527 0 : break;
1528 : }
1529 139 : }
1530 :
1531 :
1532 146 : static void eap_fast_process(struct eap_sm *sm, void *priv,
1533 : struct wpabuf *respData)
1534 : {
1535 146 : struct eap_fast_data *data = priv;
1536 146 : if (eap_server_tls_process(sm, &data->ssl, respData, data,
1537 : EAP_TYPE_FAST, eap_fast_process_version,
1538 : eap_fast_process_msg) < 0)
1539 0 : eap_fast_state(data, FAILURE);
1540 146 : }
1541 :
1542 :
1543 153 : static Boolean eap_fast_isDone(struct eap_sm *sm, void *priv)
1544 : {
1545 153 : struct eap_fast_data *data = priv;
1546 153 : return data->state == SUCCESS || data->state == FAILURE;
1547 : }
1548 :
1549 :
1550 23 : static u8 * eap_fast_getKey(struct eap_sm *sm, void *priv, size_t *len)
1551 : {
1552 23 : struct eap_fast_data *data = priv;
1553 : u8 *eapKeyData;
1554 :
1555 23 : if (data->state != SUCCESS)
1556 7 : return NULL;
1557 :
1558 16 : eapKeyData = os_malloc(EAP_FAST_KEY_LEN);
1559 16 : if (eapKeyData == NULL)
1560 0 : return NULL;
1561 :
1562 16 : eap_fast_derive_eap_msk(data->simck, eapKeyData);
1563 16 : *len = EAP_FAST_KEY_LEN;
1564 :
1565 16 : return eapKeyData;
1566 : }
1567 :
1568 :
1569 1 : static u8 * eap_fast_get_emsk(struct eap_sm *sm, void *priv, size_t *len)
1570 : {
1571 1 : struct eap_fast_data *data = priv;
1572 : u8 *eapKeyData;
1573 :
1574 1 : if (data->state != SUCCESS)
1575 0 : return NULL;
1576 :
1577 1 : eapKeyData = os_malloc(EAP_EMSK_LEN);
1578 1 : if (eapKeyData == NULL)
1579 0 : return NULL;
1580 :
1581 1 : eap_fast_derive_eap_emsk(data->simck, eapKeyData);
1582 1 : *len = EAP_EMSK_LEN;
1583 :
1584 1 : return eapKeyData;
1585 : }
1586 :
1587 :
1588 30 : static Boolean eap_fast_isSuccess(struct eap_sm *sm, void *priv)
1589 : {
1590 30 : struct eap_fast_data *data = priv;
1591 30 : return data->state == SUCCESS;
1592 : }
1593 :
1594 :
1595 23 : static u8 * eap_fast_get_session_id(struct eap_sm *sm, void *priv, size_t *len)
1596 : {
1597 23 : struct eap_fast_data *data = priv;
1598 :
1599 23 : if (data->state != SUCCESS)
1600 7 : return NULL;
1601 :
1602 16 : return eap_server_tls_derive_session_id(sm, &data->ssl, EAP_TYPE_FAST,
1603 : len);
1604 : }
1605 :
1606 :
1607 25 : int eap_server_fast_register(void)
1608 : {
1609 : struct eap_method *eap;
1610 : int ret;
1611 :
1612 25 : eap = eap_server_method_alloc(EAP_SERVER_METHOD_INTERFACE_VERSION,
1613 : EAP_VENDOR_IETF, EAP_TYPE_FAST, "FAST");
1614 25 : if (eap == NULL)
1615 0 : return -1;
1616 :
1617 25 : eap->init = eap_fast_init;
1618 25 : eap->reset = eap_fast_reset;
1619 25 : eap->buildReq = eap_fast_buildReq;
1620 25 : eap->check = eap_fast_check;
1621 25 : eap->process = eap_fast_process;
1622 25 : eap->isDone = eap_fast_isDone;
1623 25 : eap->getKey = eap_fast_getKey;
1624 25 : eap->get_emsk = eap_fast_get_emsk;
1625 25 : eap->isSuccess = eap_fast_isSuccess;
1626 25 : eap->getSessionId = eap_fast_get_session_id;
1627 :
1628 25 : ret = eap_server_method_register(eap);
1629 25 : if (ret)
1630 0 : eap_server_method_free(eap);
1631 25 : return ret;
1632 : }
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