1 /*
2 * TLSv1 client - write handshake message
3 * Copyright (c) 2006-2015, 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/md5.h"
13 #include "crypto/sha1.h"
14 #include "crypto/sha256.h"
15 #include "crypto/tls.h"
16 #include "crypto/random.h"
17 #include "x509v3.h"
18 #include "tlsv1_common.h"
19 #include "tlsv1_record.h"
20 #include "tlsv1_client.h"
21 #include "tlsv1_client_i.h"
22
23
tls_client_cert_chain_der_len(struct tlsv1_client * conn)24 static size_t tls_client_cert_chain_der_len(struct tlsv1_client *conn)
25 {
26 size_t len = 0;
27 struct x509_certificate *cert;
28
29 if (conn->cred == NULL)
30 return 0;
31
32 cert = conn->cred->cert;
33 while (cert) {
34 len += 3 + cert->cert_len;
35 if (x509_certificate_self_signed(cert))
36 break;
37 cert = x509_certificate_get_subject(conn->cred->trusted_certs,
38 &cert->issuer);
39 }
40
41 return len;
42 }
43
44
tls_send_client_hello(struct tlsv1_client * conn,size_t * out_len)45 u8 * tls_send_client_hello(struct tlsv1_client *conn, size_t *out_len)
46 {
47 u8 *hello, *end, *pos, *hs_length, *hs_start, *rhdr;
48 struct os_time now;
49 size_t len, i;
50 u8 *ext_start;
51 u16 tls_version = TLS_VERSION;
52
53 /* Pick the highest locally enabled TLS version */
54 #ifdef CONFIG_TLSV12
55 if ((conn->flags & TLS_CONN_DISABLE_TLSv1_2) &&
56 tls_version == TLS_VERSION_1_2)
57 tls_version = TLS_VERSION_1_1;
58 #endif /* CONFIG_TLSV12 */
59 #ifdef CONFIG_TLSV11
60 if ((conn->flags & TLS_CONN_DISABLE_TLSv1_1) &&
61 tls_version == TLS_VERSION_1_1)
62 tls_version = TLS_VERSION_1;
63 #endif /* CONFIG_TLSV11 */
64 if ((conn->flags & TLS_CONN_DISABLE_TLSv1_0) &&
65 tls_version == TLS_VERSION_1) {
66 wpa_printf(MSG_INFO, "TLSv1: No TLS version allowed");
67 return NULL;
68 }
69
70 wpa_printf(MSG_DEBUG, "TLSv1: Send ClientHello (ver %s)",
71 tls_version_str(tls_version));
72 *out_len = 0;
73
74 os_get_time(&now);
75 WPA_PUT_BE32(conn->client_random, now.sec);
76 if (random_get_bytes(conn->client_random + 4, TLS_RANDOM_LEN - 4)) {
77 wpa_printf(MSG_ERROR, "TLSv1: Could not generate "
78 "client_random");
79 return NULL;
80 }
81 wpa_hexdump(MSG_MSGDUMP, "TLSv1: client_random",
82 conn->client_random, TLS_RANDOM_LEN);
83
84 len = 150 + conn->num_cipher_suites * 2 + conn->client_hello_ext_len;
85 hello = os_malloc(len);
86 if (hello == NULL)
87 return NULL;
88 end = hello + len;
89
90 rhdr = hello;
91 pos = rhdr + TLS_RECORD_HEADER_LEN;
92
93 /* opaque fragment[TLSPlaintext.length] */
94
95 /* Handshake */
96 hs_start = pos;
97 /* HandshakeType msg_type */
98 *pos++ = TLS_HANDSHAKE_TYPE_CLIENT_HELLO;
99 /* uint24 length (to be filled) */
100 hs_length = pos;
101 pos += 3;
102 /* body - ClientHello */
103 /* ProtocolVersion client_version */
104 WPA_PUT_BE16(pos, tls_version);
105 pos += 2;
106 /* Random random: uint32 gmt_unix_time, opaque random_bytes */
107 os_memcpy(pos, conn->client_random, TLS_RANDOM_LEN);
108 pos += TLS_RANDOM_LEN;
109 /* SessionID session_id */
110 *pos++ = conn->session_id_len;
111 os_memcpy(pos, conn->session_id, conn->session_id_len);
112 pos += conn->session_id_len;
113 /* CipherSuite cipher_suites<2..2^16-1> */
114 WPA_PUT_BE16(pos, 2 * conn->num_cipher_suites);
115 pos += 2;
116 for (i = 0; i < conn->num_cipher_suites; i++) {
117 WPA_PUT_BE16(pos, conn->cipher_suites[i]);
118 pos += 2;
119 }
120 /* CompressionMethod compression_methods<1..2^8-1> */
121 *pos++ = 1;
122 *pos++ = TLS_COMPRESSION_NULL;
123
124 /* Extension */
125 ext_start = pos;
126 pos += 2;
127
128 #ifdef CONFIG_TLSV12
129 if (conn->rl.tls_version >= TLS_VERSION_1_2) {
130 /*
131 * Add signature_algorithms extension since we support only
132 * SHA256 (and not the default SHA1) with TLSv1.2.
133 */
134 /* ExtensionsType extension_type = signature_algorithms(13) */
135 WPA_PUT_BE16(pos, TLS_EXT_SIGNATURE_ALGORITHMS);
136 pos += 2;
137 /* opaque extension_data<0..2^16-1> length */
138 WPA_PUT_BE16(pos, 8);
139 pos += 2;
140 /* supported_signature_algorithms<2..2^16-2> length */
141 WPA_PUT_BE16(pos, 6);
142 pos += 2;
143 /* supported_signature_algorithms */
144 *pos++ = TLS_HASH_ALG_SHA512;
145 *pos++ = TLS_SIGN_ALG_RSA;
146 *pos++ = TLS_HASH_ALG_SHA384;
147 *pos++ = TLS_SIGN_ALG_RSA;
148 *pos++ = TLS_HASH_ALG_SHA256;
149 *pos++ = TLS_SIGN_ALG_RSA;
150 }
151 #endif /* CONFIG_TLSV12 */
152
153 if (conn->client_hello_ext) {
154 os_memcpy(pos, conn->client_hello_ext,
155 conn->client_hello_ext_len);
156 pos += conn->client_hello_ext_len;
157 }
158
159 if (conn->flags & TLS_CONN_REQUEST_OCSP) {
160 wpa_printf(MSG_DEBUG,
161 "TLSv1: Add status_request extension for OCSP stapling");
162 /* ExtensionsType extension_type = status_request(5) */
163 WPA_PUT_BE16(pos, TLS_EXT_STATUS_REQUEST);
164 pos += 2;
165 /* opaque extension_data<0..2^16-1> length */
166 WPA_PUT_BE16(pos, 5);
167 pos += 2;
168
169 /*
170 * RFC 6066, 8:
171 * struct {
172 * CertificateStatusType status_type;
173 * select (status_type) {
174 * case ocsp: OCSPStatusRequest;
175 * } request;
176 * } CertificateStatusRequest;
177 *
178 * enum { ocsp(1), (255) } CertificateStatusType;
179 */
180 *pos++ = 1; /* status_type = ocsp(1) */
181
182 /*
183 * struct {
184 * ResponderID responder_id_list<0..2^16-1>;
185 * Extensions request_extensions;
186 * } OCSPStatusRequest;
187 *
188 * opaque ResponderID<1..2^16-1>;
189 * opaque Extensions<0..2^16-1>;
190 */
191 WPA_PUT_BE16(pos, 0); /* responder_id_list(empty) */
192 pos += 2;
193 WPA_PUT_BE16(pos, 0); /* request_extensions(empty) */
194 pos += 2;
195
196 wpa_printf(MSG_DEBUG,
197 "TLSv1: Add status_request_v2 extension for OCSP stapling");
198 /* ExtensionsType extension_type = status_request_v2(17) */
199 WPA_PUT_BE16(pos, TLS_EXT_STATUS_REQUEST_V2);
200 pos += 2;
201 /* opaque extension_data<0..2^16-1> length */
202 WPA_PUT_BE16(pos, 7);
203 pos += 2;
204
205 /*
206 * RFC 6961, 2.2:
207 * struct {
208 * CertificateStatusType status_type;
209 * uint16 request_length;
210 * select (status_type) {
211 * case ocsp: OCSPStatusRequest;
212 * case ocsp_multi: OCSPStatusRequest;
213 * } request;
214 * } CertificateStatusRequestItemV2;
215 *
216 * enum { ocsp(1), ocsp_multi(2), (255) } CertificateStatusType;
217 *
218 * struct {
219 * CertificateStatusRequestItemV2
220 * certificate_status_req_list<1..2^16-1>;
221 * } CertificateStatusRequestListV2;
222 */
223
224 /* certificate_status_req_list<1..2^16-1> */
225 WPA_PUT_BE16(pos, 5);
226 pos += 2;
227
228 /* CertificateStatusRequestItemV2 */
229 *pos++ = 2; /* status_type = ocsp_multi(2) */
230 /* OCSPStatusRequest as shown above for v1 */
231 WPA_PUT_BE16(pos, 0); /* responder_id_list(empty) */
232 pos += 2;
233 WPA_PUT_BE16(pos, 0); /* request_extensions(empty) */
234 pos += 2;
235 }
236
237 if (pos == ext_start + 2)
238 pos -= 2; /* no extensions */
239 else
240 WPA_PUT_BE16(ext_start, pos - ext_start - 2);
241
242 WPA_PUT_BE24(hs_length, pos - hs_length - 3);
243 tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
244
245 if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
246 rhdr, end - rhdr, hs_start, pos - hs_start,
247 out_len) < 0) {
248 wpa_printf(MSG_DEBUG, "TLSv1: Failed to create TLS record");
249 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
250 TLS_ALERT_INTERNAL_ERROR);
251 os_free(hello);
252 return NULL;
253 }
254
255 conn->state = SERVER_HELLO;
256
257 return hello;
258 }
259
260
tls_write_client_certificate(struct tlsv1_client * conn,u8 ** msgpos,u8 * end)261 static int tls_write_client_certificate(struct tlsv1_client *conn,
262 u8 **msgpos, u8 *end)
263 {
264 u8 *pos, *rhdr, *hs_start, *hs_length, *cert_start;
265 size_t rlen;
266 struct x509_certificate *cert;
267
268 pos = *msgpos;
269 if (TLS_RECORD_HEADER_LEN + 1 + 3 + 3 > end - pos) {
270 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
271 TLS_ALERT_INTERNAL_ERROR);
272 return -1;
273 }
274
275 wpa_printf(MSG_DEBUG, "TLSv1: Send Certificate");
276 rhdr = pos;
277 pos += TLS_RECORD_HEADER_LEN;
278
279 /* opaque fragment[TLSPlaintext.length] */
280
281 /* Handshake */
282 hs_start = pos;
283 /* HandshakeType msg_type */
284 *pos++ = TLS_HANDSHAKE_TYPE_CERTIFICATE;
285 /* uint24 length (to be filled) */
286 hs_length = pos;
287 pos += 3;
288 /* body - Certificate */
289 /* uint24 length (to be filled) */
290 cert_start = pos;
291 pos += 3;
292 cert = conn->cred ? conn->cred->cert : NULL;
293 while (cert) {
294 if (3 + cert->cert_len > (size_t) (end - pos)) {
295 wpa_printf(MSG_DEBUG, "TLSv1: Not enough buffer space "
296 "for Certificate (cert_len=%lu left=%lu)",
297 (unsigned long) cert->cert_len,
298 (unsigned long) (end - pos));
299 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
300 TLS_ALERT_INTERNAL_ERROR);
301 return -1;
302 }
303 WPA_PUT_BE24(pos, cert->cert_len);
304 pos += 3;
305 os_memcpy(pos, cert->cert_start, cert->cert_len);
306 pos += cert->cert_len;
307
308 if (x509_certificate_self_signed(cert))
309 break;
310 cert = x509_certificate_get_subject(conn->cred->trusted_certs,
311 &cert->issuer);
312 }
313 if (conn->cred == NULL || cert == conn->cred->cert || cert == NULL) {
314 /*
315 * Client was not configured with all the needed certificates
316 * to form a full certificate chain. The server may fail to
317 * validate the chain unless it is configured with all the
318 * missing CA certificates.
319 */
320 wpa_printf(MSG_DEBUG, "TLSv1: Full client certificate chain "
321 "not configured - validation may fail");
322 }
323 WPA_PUT_BE24(cert_start, pos - cert_start - 3);
324
325 WPA_PUT_BE24(hs_length, pos - hs_length - 3);
326
327 if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
328 rhdr, end - rhdr, hs_start, pos - hs_start,
329 &rlen) < 0) {
330 wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate a record");
331 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
332 TLS_ALERT_INTERNAL_ERROR);
333 return -1;
334 }
335 pos = rhdr + rlen;
336
337 tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
338
339 *msgpos = pos;
340
341 return 0;
342 }
343
344
tlsv1_key_x_dh(struct tlsv1_client * conn,u8 ** pos,u8 * end)345 static int tlsv1_key_x_dh(struct tlsv1_client *conn, u8 **pos, u8 *end)
346 {
347 /* ClientDiffieHellmanPublic */
348 u8 *csecret, *csecret_start, *dh_yc, *shared;
349 size_t csecret_len, dh_yc_len, shared_len;
350
351 csecret_len = conn->dh_p_len;
352 csecret = os_malloc(csecret_len);
353 if (csecret == NULL) {
354 wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate "
355 "memory for Yc (Diffie-Hellman)");
356 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
357 TLS_ALERT_INTERNAL_ERROR);
358 return -1;
359 }
360 if (random_get_bytes(csecret, csecret_len)) {
361 wpa_printf(MSG_DEBUG, "TLSv1: Failed to get random "
362 "data for Diffie-Hellman");
363 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
364 TLS_ALERT_INTERNAL_ERROR);
365 os_free(csecret);
366 return -1;
367 }
368
369 if (os_memcmp(csecret, conn->dh_p, csecret_len) > 0)
370 csecret[0] = 0; /* make sure Yc < p */
371
372 csecret_start = csecret;
373 while (csecret_len > 1 && *csecret_start == 0) {
374 csecret_start++;
375 csecret_len--;
376 }
377 wpa_hexdump_key(MSG_DEBUG, "TLSv1: DH client's secret value",
378 csecret_start, csecret_len);
379
380 /* Yc = g^csecret mod p */
381 dh_yc_len = conn->dh_p_len;
382 dh_yc = os_malloc(dh_yc_len);
383 if (dh_yc == NULL) {
384 wpa_printf(MSG_DEBUG, "TLSv1: Failed to allocate "
385 "memory for Diffie-Hellman");
386 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
387 TLS_ALERT_INTERNAL_ERROR);
388 os_free(csecret);
389 return -1;
390 }
391 if (crypto_mod_exp(conn->dh_g, conn->dh_g_len,
392 csecret_start, csecret_len,
393 conn->dh_p, conn->dh_p_len,
394 dh_yc, &dh_yc_len)) {
395 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
396 TLS_ALERT_INTERNAL_ERROR);
397 os_free(csecret);
398 os_free(dh_yc);
399 return -1;
400 }
401
402 wpa_hexdump(MSG_DEBUG, "TLSv1: DH Yc (client's public value)",
403 dh_yc, dh_yc_len);
404
405 if (end - *pos < 2) {
406 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
407 TLS_ALERT_INTERNAL_ERROR);
408 os_free(csecret);
409 os_free(dh_yc);
410 return -1;
411 }
412 WPA_PUT_BE16(*pos, dh_yc_len);
413 *pos += 2;
414 if (dh_yc_len > (size_t) (end - *pos)) {
415 wpa_printf(MSG_DEBUG, "TLSv1: Not enough room in the "
416 "message buffer for Yc");
417 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
418 TLS_ALERT_INTERNAL_ERROR);
419 os_free(csecret);
420 os_free(dh_yc);
421 return -1;
422 }
423 os_memcpy(*pos, dh_yc, dh_yc_len);
424 *pos += dh_yc_len;
425 os_free(dh_yc);
426
427 shared_len = conn->dh_p_len;
428 shared = os_malloc(shared_len);
429 if (shared == NULL) {
430 wpa_printf(MSG_DEBUG, "TLSv1: Could not allocate memory for "
431 "DH");
432 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
433 TLS_ALERT_INTERNAL_ERROR);
434 os_free(csecret);
435 return -1;
436 }
437
438 /* shared = Ys^csecret mod p */
439 if (crypto_mod_exp(conn->dh_ys, conn->dh_ys_len,
440 csecret_start, csecret_len,
441 conn->dh_p, conn->dh_p_len,
442 shared, &shared_len)) {
443 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
444 TLS_ALERT_INTERNAL_ERROR);
445 os_free(csecret);
446 os_free(shared);
447 return -1;
448 }
449 wpa_hexdump_key(MSG_DEBUG, "TLSv1: Shared secret from DH key exchange",
450 shared, shared_len);
451
452 os_memset(csecret_start, 0, csecret_len);
453 os_free(csecret);
454 if (tls_derive_keys(conn, shared, shared_len)) {
455 wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive keys");
456 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
457 TLS_ALERT_INTERNAL_ERROR);
458 os_free(shared);
459 return -1;
460 }
461 os_memset(shared, 0, shared_len);
462 os_free(shared);
463 tlsv1_client_free_dh(conn);
464 return 0;
465 }
466
467
tlsv1_key_x_rsa(struct tlsv1_client * conn,u8 ** pos,u8 * end)468 static int tlsv1_key_x_rsa(struct tlsv1_client *conn, u8 **pos, u8 *end)
469 {
470 u8 pre_master_secret[TLS_PRE_MASTER_SECRET_LEN];
471 size_t clen;
472 int res;
473
474 if (tls_derive_pre_master_secret(pre_master_secret) < 0 ||
475 tls_derive_keys(conn, pre_master_secret,
476 TLS_PRE_MASTER_SECRET_LEN)) {
477 wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive keys");
478 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
479 TLS_ALERT_INTERNAL_ERROR);
480 return -1;
481 }
482
483 /* EncryptedPreMasterSecret */
484 if (conn->server_rsa_key == NULL) {
485 wpa_printf(MSG_DEBUG, "TLSv1: No server RSA key to "
486 "use for encrypting pre-master secret");
487 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
488 TLS_ALERT_INTERNAL_ERROR);
489 return -1;
490 }
491
492 /* RSA encrypted value is encoded with PKCS #1 v1.5 block type 2. */
493 *pos += 2;
494 clen = end - *pos;
495 res = crypto_public_key_encrypt_pkcs1_v15(
496 conn->server_rsa_key,
497 pre_master_secret, TLS_PRE_MASTER_SECRET_LEN,
498 *pos, &clen);
499 os_memset(pre_master_secret, 0, TLS_PRE_MASTER_SECRET_LEN);
500 if (res < 0) {
501 wpa_printf(MSG_DEBUG, "TLSv1: RSA encryption failed");
502 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
503 TLS_ALERT_INTERNAL_ERROR);
504 return -1;
505 }
506 WPA_PUT_BE16(*pos - 2, clen);
507 wpa_hexdump(MSG_MSGDUMP, "TLSv1: Encrypted pre_master_secret",
508 *pos, clen);
509 *pos += clen;
510
511 return 0;
512 }
513
514
tls_write_client_key_exchange(struct tlsv1_client * conn,u8 ** msgpos,u8 * end)515 static int tls_write_client_key_exchange(struct tlsv1_client *conn,
516 u8 **msgpos, u8 *end)
517 {
518 u8 *pos, *rhdr, *hs_start, *hs_length;
519 size_t rlen;
520 tls_key_exchange keyx;
521 const struct tls_cipher_suite *suite;
522
523 suite = tls_get_cipher_suite(conn->rl.cipher_suite);
524 if (suite == NULL)
525 keyx = TLS_KEY_X_NULL;
526 else
527 keyx = suite->key_exchange;
528
529 pos = *msgpos;
530
531 wpa_printf(MSG_DEBUG, "TLSv1: Send ClientKeyExchange");
532
533 rhdr = pos;
534 pos += TLS_RECORD_HEADER_LEN;
535
536 /* opaque fragment[TLSPlaintext.length] */
537
538 /* Handshake */
539 hs_start = pos;
540 /* HandshakeType msg_type */
541 *pos++ = TLS_HANDSHAKE_TYPE_CLIENT_KEY_EXCHANGE;
542 /* uint24 length (to be filled) */
543 hs_length = pos;
544 pos += 3;
545 /* body - ClientKeyExchange */
546 if (keyx == TLS_KEY_X_DH_anon || keyx == TLS_KEY_X_DHE_RSA) {
547 if (tlsv1_key_x_dh(conn, &pos, end) < 0)
548 return -1;
549 } else {
550 if (tlsv1_key_x_rsa(conn, &pos, end) < 0)
551 return -1;
552 }
553
554 WPA_PUT_BE24(hs_length, pos - hs_length - 3);
555
556 if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
557 rhdr, end - rhdr, hs_start, pos - hs_start,
558 &rlen) < 0) {
559 wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record");
560 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
561 TLS_ALERT_INTERNAL_ERROR);
562 return -1;
563 }
564 pos = rhdr + rlen;
565 tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
566
567 *msgpos = pos;
568
569 return 0;
570 }
571
572
tls_write_client_certificate_verify(struct tlsv1_client * conn,u8 ** msgpos,u8 * end)573 static int tls_write_client_certificate_verify(struct tlsv1_client *conn,
574 u8 **msgpos, u8 *end)
575 {
576 u8 *pos, *rhdr, *hs_start, *hs_length, *signed_start;
577 size_t rlen, hlen, clen;
578 u8 hash[100], *hpos;
579
580 pos = *msgpos;
581
582 wpa_printf(MSG_DEBUG, "TLSv1: Send CertificateVerify");
583 rhdr = pos;
584 pos += TLS_RECORD_HEADER_LEN;
585
586 /* Handshake */
587 hs_start = pos;
588 /* HandshakeType msg_type */
589 *pos++ = TLS_HANDSHAKE_TYPE_CERTIFICATE_VERIFY;
590 /* uint24 length (to be filled) */
591 hs_length = pos;
592 pos += 3;
593
594 /*
595 * RFC 2246: 7.4.3 and 7.4.8:
596 * Signature signature
597 *
598 * RSA:
599 * digitally-signed struct {
600 * opaque md5_hash[16];
601 * opaque sha_hash[20];
602 * };
603 *
604 * DSA:
605 * digitally-signed struct {
606 * opaque sha_hash[20];
607 * };
608 *
609 * The hash values are calculated over all handshake messages sent or
610 * received starting at ClientHello up to, but not including, this
611 * CertificateVerify message, including the type and length fields of
612 * the handshake messages.
613 */
614
615 hpos = hash;
616
617 #ifdef CONFIG_TLSV12
618 if (conn->rl.tls_version == TLS_VERSION_1_2) {
619 hlen = SHA256_MAC_LEN;
620 if (conn->verify.sha256_cert == NULL ||
621 crypto_hash_finish(conn->verify.sha256_cert, hpos, &hlen) <
622 0) {
623 conn->verify.sha256_cert = NULL;
624 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
625 TLS_ALERT_INTERNAL_ERROR);
626 return -1;
627 }
628 conn->verify.sha256_cert = NULL;
629
630 /*
631 * RFC 3447, A.2.4 RSASSA-PKCS1-v1_5
632 *
633 * DigestInfo ::= SEQUENCE {
634 * digestAlgorithm DigestAlgorithm,
635 * digest OCTET STRING
636 * }
637 *
638 * SHA-256 OID: sha256WithRSAEncryption ::= {pkcs-1 11}
639 *
640 * DER encoded DigestInfo for SHA256 per RFC 3447:
641 * 30 31 30 0d 06 09 60 86 48 01 65 03 04 02 01 05 00 04 20 ||
642 * H
643 */
644 os_memmove(hash + 19, hash, hlen);
645 hlen += 19;
646 os_memcpy(hash, "\x30\x31\x30\x0d\x06\x09\x60\x86\x48\x01\x65"
647 "\x03\x04\x02\x01\x05\x00\x04\x20", 19);
648 } else {
649 #endif /* CONFIG_TLSV12 */
650
651 hlen = MD5_MAC_LEN;
652 if (conn->verify.md5_cert == NULL ||
653 crypto_hash_finish(conn->verify.md5_cert, hpos, &hlen) < 0) {
654 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
655 TLS_ALERT_INTERNAL_ERROR);
656 conn->verify.md5_cert = NULL;
657 crypto_hash_finish(conn->verify.sha1_cert, NULL, NULL);
658 conn->verify.sha1_cert = NULL;
659 return -1;
660 }
661 hpos += MD5_MAC_LEN;
662
663 conn->verify.md5_cert = NULL;
664 hlen = SHA1_MAC_LEN;
665 if (conn->verify.sha1_cert == NULL ||
666 crypto_hash_finish(conn->verify.sha1_cert, hpos, &hlen) < 0) {
667 conn->verify.sha1_cert = NULL;
668 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
669 TLS_ALERT_INTERNAL_ERROR);
670 return -1;
671 }
672 conn->verify.sha1_cert = NULL;
673
674 hlen += MD5_MAC_LEN;
675
676 #ifdef CONFIG_TLSV12
677 }
678 #endif /* CONFIG_TLSV12 */
679
680 wpa_hexdump(MSG_MSGDUMP, "TLSv1: CertificateVerify hash", hash, hlen);
681
682 #ifdef CONFIG_TLSV12
683 if (conn->rl.tls_version >= TLS_VERSION_1_2) {
684 /*
685 * RFC 5246, 4.7:
686 * TLS v1.2 adds explicit indication of the used signature and
687 * hash algorithms.
688 *
689 * struct {
690 * HashAlgorithm hash;
691 * SignatureAlgorithm signature;
692 * } SignatureAndHashAlgorithm;
693 */
694 *pos++ = TLS_HASH_ALG_SHA256;
695 *pos++ = TLS_SIGN_ALG_RSA;
696 }
697 #endif /* CONFIG_TLSV12 */
698
699 /*
700 * RFC 2246, 4.7:
701 * In digital signing, one-way hash functions are used as input for a
702 * signing algorithm. A digitally-signed element is encoded as an
703 * opaque vector <0..2^16-1>, where the length is specified by the
704 * signing algorithm and key.
705 *
706 * In RSA signing, a 36-byte structure of two hashes (one SHA and one
707 * MD5) is signed (encrypted with the private key). It is encoded with
708 * PKCS #1 block type 0 or type 1 as described in [PKCS1].
709 */
710 signed_start = pos; /* length to be filled */
711 pos += 2;
712 clen = end - pos;
713 if (conn->cred == NULL ||
714 crypto_private_key_sign_pkcs1(conn->cred->key, hash, hlen,
715 pos, &clen) < 0) {
716 wpa_printf(MSG_DEBUG, "TLSv1: Failed to sign hash (PKCS #1)");
717 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
718 TLS_ALERT_INTERNAL_ERROR);
719 return -1;
720 }
721 WPA_PUT_BE16(signed_start, clen);
722
723 pos += clen;
724
725 WPA_PUT_BE24(hs_length, pos - hs_length - 3);
726
727 if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
728 rhdr, end - rhdr, hs_start, pos - hs_start,
729 &rlen) < 0) {
730 wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate a record");
731 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
732 TLS_ALERT_INTERNAL_ERROR);
733 return -1;
734 }
735 pos = rhdr + rlen;
736
737 tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
738
739 *msgpos = pos;
740
741 return 0;
742 }
743
744
tls_write_client_change_cipher_spec(struct tlsv1_client * conn,u8 ** msgpos,u8 * end)745 static int tls_write_client_change_cipher_spec(struct tlsv1_client *conn,
746 u8 **msgpos, u8 *end)
747 {
748 size_t rlen;
749 u8 payload[1];
750
751 wpa_printf(MSG_DEBUG, "TLSv1: Send ChangeCipherSpec");
752
753 payload[0] = TLS_CHANGE_CIPHER_SPEC;
754
755 if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_CHANGE_CIPHER_SPEC,
756 *msgpos, end - *msgpos, payload, sizeof(payload),
757 &rlen) < 0) {
758 wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record");
759 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
760 TLS_ALERT_INTERNAL_ERROR);
761 return -1;
762 }
763
764 if (tlsv1_record_change_write_cipher(&conn->rl) < 0) {
765 wpa_printf(MSG_DEBUG, "TLSv1: Failed to set write cipher for "
766 "record layer");
767 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
768 TLS_ALERT_INTERNAL_ERROR);
769 return -1;
770 }
771
772 *msgpos += rlen;
773
774 return 0;
775 }
776
777
tls_write_client_finished(struct tlsv1_client * conn,u8 ** msgpos,u8 * end)778 static int tls_write_client_finished(struct tlsv1_client *conn,
779 u8 **msgpos, u8 *end)
780 {
781 u8 *pos, *hs_start;
782 size_t rlen, hlen;
783 u8 verify_data[1 + 3 + TLS_VERIFY_DATA_LEN];
784 u8 hash[MD5_MAC_LEN + SHA1_MAC_LEN];
785
786 wpa_printf(MSG_DEBUG, "TLSv1: Send Finished");
787
788 /* Encrypted Handshake Message: Finished */
789
790 #ifdef CONFIG_TLSV12
791 if (conn->rl.tls_version >= TLS_VERSION_1_2) {
792 hlen = SHA256_MAC_LEN;
793 if (conn->verify.sha256_client == NULL ||
794 crypto_hash_finish(conn->verify.sha256_client, hash, &hlen)
795 < 0) {
796 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
797 TLS_ALERT_INTERNAL_ERROR);
798 conn->verify.sha256_client = NULL;
799 return -1;
800 }
801 conn->verify.sha256_client = NULL;
802 } else {
803 #endif /* CONFIG_TLSV12 */
804
805 hlen = MD5_MAC_LEN;
806 if (conn->verify.md5_client == NULL ||
807 crypto_hash_finish(conn->verify.md5_client, hash, &hlen) < 0) {
808 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
809 TLS_ALERT_INTERNAL_ERROR);
810 conn->verify.md5_client = NULL;
811 crypto_hash_finish(conn->verify.sha1_client, NULL, NULL);
812 conn->verify.sha1_client = NULL;
813 return -1;
814 }
815 conn->verify.md5_client = NULL;
816 hlen = SHA1_MAC_LEN;
817 if (conn->verify.sha1_client == NULL ||
818 crypto_hash_finish(conn->verify.sha1_client, hash + MD5_MAC_LEN,
819 &hlen) < 0) {
820 conn->verify.sha1_client = NULL;
821 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
822 TLS_ALERT_INTERNAL_ERROR);
823 return -1;
824 }
825 conn->verify.sha1_client = NULL;
826 hlen = MD5_MAC_LEN + SHA1_MAC_LEN;
827
828 #ifdef CONFIG_TLSV12
829 }
830 #endif /* CONFIG_TLSV12 */
831
832 if (tls_prf(conn->rl.tls_version,
833 conn->master_secret, TLS_MASTER_SECRET_LEN,
834 "client finished", hash, hlen,
835 verify_data + 1 + 3, TLS_VERIFY_DATA_LEN)) {
836 wpa_printf(MSG_DEBUG, "TLSv1: Failed to generate verify_data");
837 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
838 TLS_ALERT_INTERNAL_ERROR);
839 return -1;
840 }
841 wpa_hexdump_key(MSG_DEBUG, "TLSv1: verify_data (client)",
842 verify_data + 1 + 3, TLS_VERIFY_DATA_LEN);
843
844 /* Handshake */
845 pos = hs_start = verify_data;
846 /* HandshakeType msg_type */
847 *pos++ = TLS_HANDSHAKE_TYPE_FINISHED;
848 /* uint24 length */
849 WPA_PUT_BE24(pos, TLS_VERIFY_DATA_LEN);
850 pos += 3;
851 pos += TLS_VERIFY_DATA_LEN; /* verify_data already in place */
852 tls_verify_hash_add(&conn->verify, hs_start, pos - hs_start);
853
854 if (tlsv1_record_send(&conn->rl, TLS_CONTENT_TYPE_HANDSHAKE,
855 *msgpos, end - *msgpos, hs_start, pos - hs_start,
856 &rlen) < 0) {
857 wpa_printf(MSG_DEBUG, "TLSv1: Failed to create a record");
858 tls_alert(conn, TLS_ALERT_LEVEL_FATAL,
859 TLS_ALERT_INTERNAL_ERROR);
860 return -1;
861 }
862
863 *msgpos += rlen;
864
865 return 0;
866 }
867
868
tls_send_client_key_exchange(struct tlsv1_client * conn,size_t * out_len)869 static u8 * tls_send_client_key_exchange(struct tlsv1_client *conn,
870 size_t *out_len)
871 {
872 u8 *msg, *end, *pos;
873 size_t msglen;
874
875 *out_len = 0;
876
877 msglen = 2000;
878 if (conn->certificate_requested)
879 msglen += tls_client_cert_chain_der_len(conn);
880
881 msg = os_malloc(msglen);
882 if (msg == NULL)
883 return NULL;
884
885 pos = msg;
886 end = msg + msglen;
887
888 if (conn->certificate_requested) {
889 if (tls_write_client_certificate(conn, &pos, end) < 0) {
890 os_free(msg);
891 return NULL;
892 }
893 }
894
895 if (tls_write_client_key_exchange(conn, &pos, end) < 0 ||
896 (conn->certificate_requested && conn->cred && conn->cred->key &&
897 tls_write_client_certificate_verify(conn, &pos, end) < 0) ||
898 tls_write_client_change_cipher_spec(conn, &pos, end) < 0 ||
899 tls_write_client_finished(conn, &pos, end) < 0) {
900 os_free(msg);
901 return NULL;
902 }
903
904 *out_len = pos - msg;
905
906 conn->state = SERVER_CHANGE_CIPHER_SPEC;
907
908 return msg;
909 }
910
911
tls_send_change_cipher_spec(struct tlsv1_client * conn,size_t * out_len)912 static u8 * tls_send_change_cipher_spec(struct tlsv1_client *conn,
913 size_t *out_len)
914 {
915 u8 *msg, *end, *pos;
916
917 *out_len = 0;
918
919 msg = os_malloc(1000);
920 if (msg == NULL)
921 return NULL;
922
923 pos = msg;
924 end = msg + 1000;
925
926 if (tls_write_client_change_cipher_spec(conn, &pos, end) < 0 ||
927 tls_write_client_finished(conn, &pos, end) < 0) {
928 os_free(msg);
929 return NULL;
930 }
931
932 *out_len = pos - msg;
933
934 wpa_printf(MSG_DEBUG, "TLSv1: Session resumption completed "
935 "successfully");
936 if (!conn->session_resumed && conn->use_session_ticket)
937 conn->session_resumed = 1;
938 conn->state = ESTABLISHED;
939
940 return msg;
941 }
942
943
tlsv1_client_handshake_write(struct tlsv1_client * conn,size_t * out_len,int no_appl_data)944 u8 * tlsv1_client_handshake_write(struct tlsv1_client *conn, size_t *out_len,
945 int no_appl_data)
946 {
947 switch (conn->state) {
948 case CLIENT_KEY_EXCHANGE:
949 return tls_send_client_key_exchange(conn, out_len);
950 case CHANGE_CIPHER_SPEC:
951 return tls_send_change_cipher_spec(conn, out_len);
952 case ACK_FINISHED:
953 wpa_printf(MSG_DEBUG, "TLSv1: Handshake completed "
954 "successfully");
955 conn->state = ESTABLISHED;
956 *out_len = 0;
957 if (no_appl_data) {
958 /* Need to return something to get final TLS ACK. */
959 return os_malloc(1);
960 }
961 return NULL;
962 default:
963 wpa_printf(MSG_DEBUG, "TLSv1: Unexpected state %d while "
964 "generating reply", conn->state);
965 return NULL;
966 }
967 }
968
969
tlsv1_client_send_alert(struct tlsv1_client * conn,u8 level,u8 description,size_t * out_len)970 u8 * tlsv1_client_send_alert(struct tlsv1_client *conn, u8 level,
971 u8 description, size_t *out_len)
972 {
973 u8 *alert, *pos, *length;
974
975 wpa_printf(MSG_DEBUG, "TLSv1: Send Alert(%d:%d)", level, description);
976 *out_len = 0;
977
978 alert = os_malloc(10);
979 if (alert == NULL)
980 return NULL;
981
982 pos = alert;
983
984 /* TLSPlaintext */
985 /* ContentType type */
986 *pos++ = TLS_CONTENT_TYPE_ALERT;
987 /* ProtocolVersion version */
988 WPA_PUT_BE16(pos, conn->rl.tls_version ? conn->rl.tls_version :
989 TLS_VERSION);
990 pos += 2;
991 /* uint16 length (to be filled) */
992 length = pos;
993 pos += 2;
994 /* opaque fragment[TLSPlaintext.length] */
995
996 /* Alert */
997 /* AlertLevel level */
998 *pos++ = level;
999 /* AlertDescription description */
1000 *pos++ = description;
1001
1002 WPA_PUT_BE16(length, pos - length - 2);
1003 *out_len = pos - alert;
1004
1005 return alert;
1006 }
1007