2 * TLSv1 server - read handshake message
3 * Copyright (c) 2006-2007, Jouni Malinen <j@w1.fi>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation.
9 * Alternatively, this software may be distributed under the terms of BSD
12 * See README and COPYING for more details.
22 #include "tlsv1_common.h"
23 #include "tlsv1_record.h"
24 #include "tlsv1_server.h"
25 #include "tlsv1_server_i.h"
28 static int tls_process_client_key_exchange(struct tlsv1_server *conn, u8 ct,
29 const u8 *in_data, size_t *in_len);
30 static int tls_process_change_cipher_spec(struct tlsv1_server *conn,
31 u8 ct, const u8 *in_data,
35 static int tls_process_client_hello(struct tlsv1_server *conn, u8 ct,
36 const u8 *in_data, size_t *in_len)
38 const u8 *pos, *end, *c;
39 size_t left, len, i, j;
44 if (ct != TLS_CONTENT_TYPE_HANDSHAKE) {
45 wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; "
46 "received content type 0x%x", ct);
47 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
48 TLS_ALERT_UNEXPECTED_MESSAGE);
58 /* HandshakeType msg_type */
59 if (*pos != TLS_HANDSHAKE_TYPE_CLIENT_HELLO) {
60 wpa_printf(MSG_DEBUG, "TLSv1: Received unexpected handshake "
61 "message %d (expected ClientHello)", *pos);
62 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
63 TLS_ALERT_UNEXPECTED_MESSAGE);
66 wpa_printf(MSG_DEBUG, "TLSv1: Received ClientHello");
69 len = WPA_GET_BE24(pos);
76 /* body - ClientHello */
78 wpa_hexdump(MSG_MSGDUMP, "TLSv1: ClientHello", pos, len);
81 /* ProtocolVersion client_version */
84 conn->client_version = WPA_GET_BE16(pos);
85 wpa_printf(MSG_DEBUG, "TLSv1: Client version %d.%d",
86 conn->client_version >> 8, conn->client_version & 0xff);
87 if (conn->client_version < TLS_VERSION) {
88 wpa_printf(MSG_DEBUG, "TLSv1: Unexpected protocol version in "
90 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
91 TLS_ALERT_PROTOCOL_VERSION);
97 if (end - pos < TLS_RANDOM_LEN)
100 os_memcpy(conn->client_random, pos, TLS_RANDOM_LEN);
101 pos += TLS_RANDOM_LEN;
102 wpa_hexdump(MSG_MSGDUMP, "TLSv1: client_random",
103 conn->client_random, TLS_RANDOM_LEN);
105 /* SessionID session_id */
108 if (end - pos < 1 + *pos || *pos > TLS_SESSION_ID_MAX_LEN)
110 wpa_hexdump(MSG_MSGDUMP, "TLSv1: client session_id", pos + 1, *pos);
112 /* TODO: add support for session resumption */
114 /* CipherSuite cipher_suites<2..2^16-1> */
117 num_suites = WPA_GET_BE16(pos);
119 if (end - pos < num_suites)
121 wpa_hexdump(MSG_MSGDUMP, "TLSv1: client cipher suites",
128 for (i = 0; !cipher_suite && i < conn->num_cipher_suites; i++) {
130 for (j = 0; j < num_suites; j++) {
131 u16 tmp = WPA_GET_BE16(c);
133 if (!cipher_suite && tmp == conn->cipher_suites[i]) {
139 pos += num_suites * 2;
141 wpa_printf(MSG_INFO, "TLSv1: No supported cipher suite "
143 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
144 TLS_ALERT_ILLEGAL_PARAMETER);
148 if (tlsv1_record_set_cipher_suite(&conn->rl, cipher_suite) < 0) {
149 wpa_printf(MSG_DEBUG, "TLSv1: Failed to set CipherSuite for "
151 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
152 TLS_ALERT_INTERNAL_ERROR);
156 conn->cipher_suite = cipher_suite;
158 /* CompressionMethod compression_methods<1..2^8-1> */
162 if (end - pos < num_suites)
164 wpa_hexdump(MSG_MSGDUMP, "TLSv1: client compression_methods",
166 compr_null_found = 0;
167 for (i = 0; i < num_suites; i++) {
168 if (*pos++ == TLS_COMPRESSION_NULL)
169 compr_null_found = 1;
171 if (!compr_null_found) {
172 wpa_printf(MSG_INFO, "TLSv1: Client does not accept NULL "
174 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
175 TLS_ALERT_ILLEGAL_PARAMETER);
179 if (end - pos == 1) {
180 wpa_printf(MSG_DEBUG, "TLSv1: Unexpected extra octet in the "
181 "end of ClientHello: 0x%02x", *pos);
185 if (end - pos >= 2) {
188 /* Extension client_hello_extension_list<0..2^16-1> */
190 ext_len = WPA_GET_BE16(pos);
193 wpa_printf(MSG_DEBUG, "TLSv1: %u bytes of ClientHello "
194 "extensions", ext_len);
195 if (end - pos != ext_len) {
196 wpa_printf(MSG_DEBUG, "TLSv1: Invalid ClientHello "
197 "extension list length %u (expected %u)",
204 * ExtensionType extension_type (0..65535)
205 * opaque extension_data<0..2^16-1>
210 u16 ext_type, ext_len;
213 wpa_printf(MSG_DEBUG, "TLSv1: Invalid "
214 "extension_type field");
218 ext_type = WPA_GET_BE16(pos);
222 wpa_printf(MSG_DEBUG, "TLSv1: Invalid "
223 "extension_data length field");
227 ext_len = WPA_GET_BE16(pos);
230 if (end - pos < ext_len) {
231 wpa_printf(MSG_DEBUG, "TLSv1: Invalid "
232 "extension_data field");
236 wpa_printf(MSG_DEBUG, "TLSv1: ClientHello Extension "
237 "type %u", ext_type);
238 wpa_hexdump(MSG_MSGDUMP, "TLSv1: ClientHello "
239 "Extension data", pos, ext_len);
241 if (ext_type == TLS_EXT_SESSION_TICKET) {
242 os_free(conn->session_ticket);
243 conn->session_ticket = os_malloc(ext_len);
244 if (conn->session_ticket) {
245 os_memcpy(conn->session_ticket, pos,
247 conn->session_ticket_len = ext_len;
255 *in_len = end - in_data;
257 wpa_printf(MSG_DEBUG, "TLSv1: ClientHello OK - proceed to "
259 conn->state = SERVER_HELLO;
264 wpa_printf(MSG_DEBUG, "TLSv1: Failed to decode ClientHello");
265 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
266 TLS_ALERT_DECODE_ERROR);
271 static int tls_process_certificate(struct tlsv1_server *conn, u8 ct,
272 const u8 *in_data, size_t *in_len)
275 size_t left, len, list_len, cert_len, idx;
277 struct x509_certificate *chain = NULL, *last = NULL, *cert;
280 if (ct != TLS_CONTENT_TYPE_HANDSHAKE) {
281 wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; "
282 "received content type 0x%x", ct);
283 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
284 TLS_ALERT_UNEXPECTED_MESSAGE);
292 wpa_printf(MSG_DEBUG, "TLSv1: Too short Certificate message "
293 "(len=%lu)", (unsigned long) left);
294 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
295 TLS_ALERT_DECODE_ERROR);
300 len = WPA_GET_BE24(pos);
305 wpa_printf(MSG_DEBUG, "TLSv1: Unexpected Certificate message "
306 "length (len=%lu != left=%lu)",
307 (unsigned long) len, (unsigned long) left);
308 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
309 TLS_ALERT_DECODE_ERROR);
313 if (type == TLS_HANDSHAKE_TYPE_CLIENT_KEY_EXCHANGE) {
314 if (conn->verify_peer) {
315 wpa_printf(MSG_DEBUG, "TLSv1: Client did not include "
317 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
318 TLS_ALERT_UNEXPECTED_MESSAGE);
322 return tls_process_client_key_exchange(conn, ct, in_data,
325 if (type != TLS_HANDSHAKE_TYPE_CERTIFICATE) {
326 wpa_printf(MSG_DEBUG, "TLSv1: Received unexpected handshake "
327 "message %d (expected Certificate/"
328 "ClientKeyExchange)", type);
329 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
330 TLS_ALERT_UNEXPECTED_MESSAGE);
334 wpa_printf(MSG_DEBUG,
335 "TLSv1: Received Certificate (certificate_list len %lu)",
336 (unsigned long) len);
339 * opaque ASN.1Cert<2^24-1>;
342 * ASN.1Cert certificate_list<1..2^24-1>;
349 wpa_printf(MSG_DEBUG, "TLSv1: Too short Certificate "
350 "(left=%lu)", (unsigned long) left);
351 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
352 TLS_ALERT_DECODE_ERROR);
356 list_len = WPA_GET_BE24(pos);
359 if ((size_t) (end - pos) != list_len) {
360 wpa_printf(MSG_DEBUG, "TLSv1: Unexpected certificate_list "
361 "length (len=%lu left=%lu)",
362 (unsigned long) list_len,
363 (unsigned long) (end - pos));
364 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
365 TLS_ALERT_DECODE_ERROR);
372 wpa_printf(MSG_DEBUG, "TLSv1: Failed to parse "
374 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
375 TLS_ALERT_DECODE_ERROR);
376 x509_certificate_chain_free(chain);
380 cert_len = WPA_GET_BE24(pos);
383 if ((size_t) (end - pos) < cert_len) {
384 wpa_printf(MSG_DEBUG, "TLSv1: Unexpected certificate "
385 "length (len=%lu left=%lu)",
386 (unsigned long) cert_len,
387 (unsigned long) (end - pos));
388 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
389 TLS_ALERT_DECODE_ERROR);
390 x509_certificate_chain_free(chain);
394 wpa_printf(MSG_DEBUG, "TLSv1: Certificate %lu (len %lu)",
395 (unsigned long) idx, (unsigned long) cert_len);
398 crypto_public_key_free(conn->client_rsa_key);
399 if (tls_parse_cert(pos, cert_len,
400 &conn->client_rsa_key)) {
401 wpa_printf(MSG_DEBUG, "TLSv1: Failed to parse "
403 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
404 TLS_ALERT_BAD_CERTIFICATE);
405 x509_certificate_chain_free(chain);
410 cert = x509_certificate_parse(pos, cert_len);
412 wpa_printf(MSG_DEBUG, "TLSv1: Failed to parse "
414 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
415 TLS_ALERT_BAD_CERTIFICATE);
416 x509_certificate_chain_free(chain);
430 if (x509_certificate_chain_validate(conn->cred->trusted_certs, chain,
433 wpa_printf(MSG_DEBUG, "TLSv1: Server certificate chain "
434 "validation failed (reason=%d)", reason);
436 case X509_VALIDATE_BAD_CERTIFICATE:
437 tls_reason = TLS_ALERT_BAD_CERTIFICATE;
439 case X509_VALIDATE_UNSUPPORTED_CERTIFICATE:
440 tls_reason = TLS_ALERT_UNSUPPORTED_CERTIFICATE;
442 case X509_VALIDATE_CERTIFICATE_REVOKED:
443 tls_reason = TLS_ALERT_CERTIFICATE_REVOKED;
445 case X509_VALIDATE_CERTIFICATE_EXPIRED:
446 tls_reason = TLS_ALERT_CERTIFICATE_EXPIRED;
448 case X509_VALIDATE_CERTIFICATE_UNKNOWN:
449 tls_reason = TLS_ALERT_CERTIFICATE_UNKNOWN;
451 case X509_VALIDATE_UNKNOWN_CA:
452 tls_reason = TLS_ALERT_UNKNOWN_CA;
455 tls_reason = TLS_ALERT_BAD_CERTIFICATE;
458 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL, tls_reason);
459 x509_certificate_chain_free(chain);
463 x509_certificate_chain_free(chain);
465 *in_len = end - in_data;
467 conn->state = CLIENT_KEY_EXCHANGE;
473 static int tls_process_client_key_exchange_rsa(
474 struct tlsv1_server *conn, const u8 *pos, const u8 *end)
477 size_t outlen, outbuflen;
483 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
484 TLS_ALERT_DECODE_ERROR);
488 encr_len = WPA_GET_BE16(pos);
491 outbuflen = outlen = end - pos;
492 out = os_malloc(outlen >= TLS_PRE_MASTER_SECRET_LEN ?
493 outlen : TLS_PRE_MASTER_SECRET_LEN);
495 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
496 TLS_ALERT_INTERNAL_ERROR);
502 * ProtocolVersion client_version;
507 * public-key-encrypted PreMasterSecret pre_master_secret;
508 * } EncryptedPreMasterSecret;
512 * Note: To avoid Bleichenbacher attack, we do not report decryption or
513 * parsing errors from EncryptedPreMasterSecret processing to the
514 * client. Instead, a random pre-master secret is used to force the
518 if (crypto_private_key_decrypt_pkcs1_v15(conn->cred->key,
521 wpa_printf(MSG_DEBUG, "TLSv1: Failed to decrypt "
522 "PreMasterSecret (encr_len=%d outlen=%lu)",
523 end - pos, (unsigned long) outlen);
527 if (outlen != TLS_PRE_MASTER_SECRET_LEN) {
528 wpa_printf(MSG_DEBUG, "TLSv1: Unexpected PreMasterSecret "
529 "length %lu", (unsigned long) outlen);
533 if (WPA_GET_BE16(out) != conn->client_version) {
534 wpa_printf(MSG_DEBUG, "TLSv1: Client version in "
535 "ClientKeyExchange does not match with version in "
541 wpa_printf(MSG_DEBUG, "TLSv1: Using random premaster secret "
542 "to avoid revealing information about private key");
543 outlen = TLS_PRE_MASTER_SECRET_LEN;
544 if (os_get_random(out, outlen)) {
545 wpa_printf(MSG_DEBUG, "TLSv1: Failed to get random "
547 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
548 TLS_ALERT_INTERNAL_ERROR);
554 res = tlsv1_server_derive_keys(conn, out, outlen);
556 /* Clear the pre-master secret since it is not needed anymore */
557 os_memset(out, 0, outbuflen);
561 wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive keys");
562 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
563 TLS_ALERT_INTERNAL_ERROR);
571 static int tls_process_client_key_exchange_dh_anon(
572 struct tlsv1_server *conn, const u8 *pos, const u8 *end)
574 #ifdef EAP_SERVER_FAST
583 * select (PublicValueEncoding) {
584 * case implicit: struct { };
585 * case explicit: opaque dh_Yc<1..2^16-1>;
587 * } ClientDiffieHellmanPublic;
590 wpa_hexdump(MSG_MSGDUMP, "TLSv1: ClientDiffieHellmanPublic",
594 wpa_printf(MSG_DEBUG, "TLSv1: Implicit public value encoding "
596 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
597 TLS_ALERT_INTERNAL_ERROR);
602 wpa_printf(MSG_DEBUG, "TLSv1: Invalid client public value "
604 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
605 TLS_ALERT_DECODE_ERROR);
609 dh_yc_len = WPA_GET_BE16(pos);
612 if (dh_yc + dh_yc_len > end) {
613 wpa_printf(MSG_DEBUG, "TLSv1: Client public value overflow "
614 "(length %d)", dh_yc_len);
615 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
616 TLS_ALERT_DECODE_ERROR);
620 wpa_hexdump(MSG_DEBUG, "TLSv1: DH Yc (client's public value)",
623 if (conn->cred == NULL || conn->cred->dh_p == NULL ||
624 conn->dh_secret == NULL) {
625 wpa_printf(MSG_DEBUG, "TLSv1: No DH parameters available");
626 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
627 TLS_ALERT_INTERNAL_ERROR);
631 shared_len = conn->cred->dh_p_len;
632 shared = os_malloc(shared_len);
633 if (shared == NULL) {
634 wpa_printf(MSG_DEBUG, "TLSv1: Could not allocate memory for "
636 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
637 TLS_ALERT_INTERNAL_ERROR);
641 /* shared = Yc^secret mod p */
642 if (crypto_mod_exp(dh_yc, dh_yc_len, conn->dh_secret,
644 conn->cred->dh_p, conn->cred->dh_p_len,
645 shared, &shared_len)) {
647 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
648 TLS_ALERT_INTERNAL_ERROR);
651 wpa_hexdump_key(MSG_DEBUG, "TLSv1: Shared secret from DH key exchange",
654 os_memset(conn->dh_secret, 0, conn->dh_secret_len);
655 os_free(conn->dh_secret);
656 conn->dh_secret = NULL;
658 res = tlsv1_server_derive_keys(conn, shared, shared_len);
660 /* Clear the pre-master secret since it is not needed anymore */
661 os_memset(shared, 0, shared_len);
665 wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive keys");
666 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
667 TLS_ALERT_INTERNAL_ERROR);
672 #else /* EAP_SERVER_FAST */
674 #endif /* EAP_SERVER_FAST */
678 static int tls_process_client_key_exchange(struct tlsv1_server *conn, u8 ct,
679 const u8 *in_data, size_t *in_len)
684 tls_key_exchange keyx;
685 const struct tls_cipher_suite *suite;
687 if (ct != TLS_CONTENT_TYPE_HANDSHAKE) {
688 wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; "
689 "received content type 0x%x", ct);
690 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
691 TLS_ALERT_UNEXPECTED_MESSAGE);
699 wpa_printf(MSG_DEBUG, "TLSv1: Too short ClientKeyExchange "
700 "(Left=%lu)", (unsigned long) left);
701 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
702 TLS_ALERT_DECODE_ERROR);
707 len = WPA_GET_BE24(pos);
712 wpa_printf(MSG_DEBUG, "TLSv1: Mismatch in ClientKeyExchange "
713 "length (len=%lu != left=%lu)",
714 (unsigned long) len, (unsigned long) left);
715 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
716 TLS_ALERT_DECODE_ERROR);
722 if (type != TLS_HANDSHAKE_TYPE_CLIENT_KEY_EXCHANGE) {
723 wpa_printf(MSG_DEBUG, "TLSv1: Received unexpected handshake "
724 "message %d (expected ClientKeyExchange)", type);
725 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
726 TLS_ALERT_UNEXPECTED_MESSAGE);
730 wpa_printf(MSG_DEBUG, "TLSv1: Received ClientKeyExchange");
732 wpa_hexdump(MSG_DEBUG, "TLSv1: ClientKeyExchange", pos, len);
734 suite = tls_get_cipher_suite(conn->rl.cipher_suite);
736 keyx = TLS_KEY_X_NULL;
738 keyx = suite->key_exchange;
740 if (keyx == TLS_KEY_X_DH_anon &&
741 tls_process_client_key_exchange_dh_anon(conn, pos, end) < 0)
744 if (keyx != TLS_KEY_X_DH_anon &&
745 tls_process_client_key_exchange_rsa(conn, pos, end) < 0)
748 *in_len = end - in_data;
750 conn->state = CERTIFICATE_VERIFY;
756 static int tls_process_certificate_verify(struct tlsv1_server *conn, u8 ct,
757 const u8 *in_data, size_t *in_len)
763 u8 hash[MD5_MAC_LEN + SHA1_MAC_LEN], *hpos, *buf;
764 enum { SIGN_ALG_RSA, SIGN_ALG_DSA } alg = SIGN_ALG_RSA;
767 if (ct == TLS_CONTENT_TYPE_CHANGE_CIPHER_SPEC) {
768 if (conn->verify_peer) {
769 wpa_printf(MSG_DEBUG, "TLSv1: Client did not include "
770 "CertificateVerify");
771 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
772 TLS_ALERT_UNEXPECTED_MESSAGE);
776 return tls_process_change_cipher_spec(conn, ct, in_data,
780 if (ct != TLS_CONTENT_TYPE_HANDSHAKE) {
781 wpa_printf(MSG_DEBUG, "TLSv1: Expected Handshake; "
782 "received content type 0x%x", ct);
783 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
784 TLS_ALERT_UNEXPECTED_MESSAGE);
792 wpa_printf(MSG_DEBUG, "TLSv1: Too short CertificateVerify "
793 "message (len=%lu)", (unsigned long) left);
794 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
795 TLS_ALERT_DECODE_ERROR);
800 len = WPA_GET_BE24(pos);
805 wpa_printf(MSG_DEBUG, "TLSv1: Unexpected CertificateVerify "
806 "message length (len=%lu != left=%lu)",
807 (unsigned long) len, (unsigned long) left);
808 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
809 TLS_ALERT_DECODE_ERROR);
815 if (type != TLS_HANDSHAKE_TYPE_CERTIFICATE_VERIFY) {
816 wpa_printf(MSG_DEBUG, "TLSv1: Received unexpected handshake "
817 "message %d (expected CertificateVerify)", type);
818 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
819 TLS_ALERT_UNEXPECTED_MESSAGE);
823 wpa_printf(MSG_DEBUG, "TLSv1: Received CertificateVerify");
827 * Signature signature;
828 * } CertificateVerify;
833 if (alg == SIGN_ALG_RSA) {
835 if (conn->verify.md5_cert == NULL ||
836 crypto_hash_finish(conn->verify.md5_cert, hpos, &hlen) < 0)
838 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
839 TLS_ALERT_INTERNAL_ERROR);
840 conn->verify.md5_cert = NULL;
841 crypto_hash_finish(conn->verify.sha1_cert, NULL, NULL);
842 conn->verify.sha1_cert = NULL;
847 crypto_hash_finish(conn->verify.md5_cert, NULL, NULL);
849 conn->verify.md5_cert = NULL;
851 if (conn->verify.sha1_cert == NULL ||
852 crypto_hash_finish(conn->verify.sha1_cert, hpos, &hlen) < 0) {
853 conn->verify.sha1_cert = NULL;
854 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
855 TLS_ALERT_INTERNAL_ERROR);
858 conn->verify.sha1_cert = NULL;
860 if (alg == SIGN_ALG_RSA)
863 wpa_hexdump(MSG_MSGDUMP, "TLSv1: CertificateVerify hash", hash, hlen);
866 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
867 TLS_ALERT_DECODE_ERROR);
870 slen = WPA_GET_BE16(pos);
872 if (end - pos < slen) {
873 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
874 TLS_ALERT_DECODE_ERROR);
878 wpa_hexdump(MSG_MSGDUMP, "TLSv1: Signature", pos, end - pos);
879 if (conn->client_rsa_key == NULL) {
880 wpa_printf(MSG_DEBUG, "TLSv1: No client public key to verify "
882 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
883 TLS_ALERT_INTERNAL_ERROR);
888 buf = os_malloc(end - pos);
889 if (crypto_public_key_decrypt_pkcs1(conn->client_rsa_key,
890 pos, end - pos, buf, &buflen) < 0)
892 wpa_printf(MSG_DEBUG, "TLSv1: Failed to decrypt signature");
894 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
895 TLS_ALERT_DECRYPT_ERROR);
899 wpa_hexdump_key(MSG_MSGDUMP, "TLSv1: Decrypted Signature",
902 if (buflen != hlen || os_memcmp(buf, hash, buflen) != 0) {
903 wpa_printf(MSG_DEBUG, "TLSv1: Invalid Signature in "
904 "CertificateVerify - did not match with calculated "
907 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
908 TLS_ALERT_DECRYPT_ERROR);
914 *in_len = end - in_data;
916 conn->state = CHANGE_CIPHER_SPEC;
922 static int tls_process_change_cipher_spec(struct tlsv1_server *conn,
923 u8 ct, const u8 *in_data,
929 if (ct != TLS_CONTENT_TYPE_CHANGE_CIPHER_SPEC) {
930 wpa_printf(MSG_DEBUG, "TLSv1: Expected ChangeCipherSpec; "
931 "received content type 0x%x", ct);
932 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
933 TLS_ALERT_UNEXPECTED_MESSAGE);
941 wpa_printf(MSG_DEBUG, "TLSv1: Too short ChangeCipherSpec");
942 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
943 TLS_ALERT_DECODE_ERROR);
947 if (*pos != TLS_CHANGE_CIPHER_SPEC) {
948 wpa_printf(MSG_DEBUG, "TLSv1: Expected ChangeCipherSpec; "
949 "received data 0x%x", *pos);
950 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
951 TLS_ALERT_UNEXPECTED_MESSAGE);
955 wpa_printf(MSG_DEBUG, "TLSv1: Received ChangeCipherSpec");
956 if (tlsv1_record_change_read_cipher(&conn->rl) < 0) {
957 wpa_printf(MSG_DEBUG, "TLSv1: Failed to change read cipher "
959 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
960 TLS_ALERT_INTERNAL_ERROR);
964 *in_len = pos + 1 - in_data;
966 conn->state = CLIENT_FINISHED;
972 static int tls_process_client_finished(struct tlsv1_server *conn, u8 ct,
973 const u8 *in_data, size_t *in_len)
976 size_t left, len, hlen;
977 u8 verify_data[TLS_VERIFY_DATA_LEN];
978 u8 hash[MD5_MAC_LEN + SHA1_MAC_LEN];
980 if (ct != TLS_CONTENT_TYPE_HANDSHAKE) {
981 wpa_printf(MSG_DEBUG, "TLSv1: Expected Finished; "
982 "received content type 0x%x", ct);
983 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
984 TLS_ALERT_UNEXPECTED_MESSAGE);
992 wpa_printf(MSG_DEBUG, "TLSv1: Too short record (left=%lu) for "
994 (unsigned long) left);
995 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
996 TLS_ALERT_DECODE_ERROR);
1000 if (pos[0] != TLS_HANDSHAKE_TYPE_FINISHED) {
1001 wpa_printf(MSG_DEBUG, "TLSv1: Expected Finished; received "
1002 "type 0x%x", pos[0]);
1003 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
1004 TLS_ALERT_UNEXPECTED_MESSAGE);
1008 len = WPA_GET_BE24(pos + 1);
1014 wpa_printf(MSG_DEBUG, "TLSv1: Too short buffer for Finished "
1015 "(len=%lu > left=%lu)",
1016 (unsigned long) len, (unsigned long) left);
1017 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
1018 TLS_ALERT_DECODE_ERROR);
1022 if (len != TLS_VERIFY_DATA_LEN) {
1023 wpa_printf(MSG_DEBUG, "TLSv1: Unexpected verify_data length "
1024 "in Finished: %lu (expected %d)",
1025 (unsigned long) len, TLS_VERIFY_DATA_LEN);
1026 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
1027 TLS_ALERT_DECODE_ERROR);
1030 wpa_hexdump(MSG_MSGDUMP, "TLSv1: verify_data in Finished",
1031 pos, TLS_VERIFY_DATA_LEN);
1034 if (conn->verify.md5_client == NULL ||
1035 crypto_hash_finish(conn->verify.md5_client, hash, &hlen) < 0) {
1036 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
1037 TLS_ALERT_INTERNAL_ERROR);
1038 conn->verify.md5_client = NULL;
1039 crypto_hash_finish(conn->verify.sha1_client, NULL, NULL);
1040 conn->verify.sha1_client = NULL;
1043 conn->verify.md5_client = NULL;
1044 hlen = SHA1_MAC_LEN;
1045 if (conn->verify.sha1_client == NULL ||
1046 crypto_hash_finish(conn->verify.sha1_client, hash + MD5_MAC_LEN,
1048 conn->verify.sha1_client = NULL;
1049 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
1050 TLS_ALERT_INTERNAL_ERROR);
1053 conn->verify.sha1_client = NULL;
1055 if (tls_prf(conn->master_secret, TLS_MASTER_SECRET_LEN,
1056 "client finished", hash, MD5_MAC_LEN + SHA1_MAC_LEN,
1057 verify_data, TLS_VERIFY_DATA_LEN)) {
1058 wpa_printf(MSG_DEBUG, "TLSv1: Failed to derive verify_data");
1059 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
1060 TLS_ALERT_DECRYPT_ERROR);
1063 wpa_hexdump_key(MSG_DEBUG, "TLSv1: verify_data (client)",
1064 verify_data, TLS_VERIFY_DATA_LEN);
1066 if (os_memcmp(pos, verify_data, TLS_VERIFY_DATA_LEN) != 0) {
1067 wpa_printf(MSG_INFO, "TLSv1: Mismatch in verify_data");
1071 wpa_printf(MSG_DEBUG, "TLSv1: Received Finished");
1073 *in_len = end - in_data;
1075 if (conn->use_session_ticket) {
1076 /* Abbreviated handshake using session ticket; RFC 4507 */
1077 wpa_printf(MSG_DEBUG, "TLSv1: Abbreviated handshake completed "
1079 conn->state = ESTABLISHED;
1081 /* Full handshake */
1082 conn->state = SERVER_CHANGE_CIPHER_SPEC;
1089 int tlsv1_server_process_handshake(struct tlsv1_server *conn, u8 ct,
1090 const u8 *buf, size_t *len)
1092 if (ct == TLS_CONTENT_TYPE_ALERT) {
1094 wpa_printf(MSG_DEBUG, "TLSv1: Alert underflow");
1095 tlsv1_server_alert(conn, TLS_ALERT_LEVEL_FATAL,
1096 TLS_ALERT_DECODE_ERROR);
1099 wpa_printf(MSG_DEBUG, "TLSv1: Received alert %d:%d",
1102 conn->state = FAILED;
1106 switch (conn->state) {
1108 if (tls_process_client_hello(conn, ct, buf, len))
1111 case CLIENT_CERTIFICATE:
1112 if (tls_process_certificate(conn, ct, buf, len))
1115 case CLIENT_KEY_EXCHANGE:
1116 if (tls_process_client_key_exchange(conn, ct, buf, len))
1119 case CERTIFICATE_VERIFY:
1120 if (tls_process_certificate_verify(conn, ct, buf, len))
1123 case CHANGE_CIPHER_SPEC:
1124 if (tls_process_change_cipher_spec(conn, ct, buf, len))
1127 case CLIENT_FINISHED:
1128 if (tls_process_client_finished(conn, ct, buf, len))
1132 wpa_printf(MSG_DEBUG, "TLSv1: Unexpected state %d "
1133 "while processing received message",
1138 if (ct == TLS_CONTENT_TYPE_HANDSHAKE)
1139 tls_verify_hash_add(&conn->verify, buf, *len);