1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
58 /* ====================================================================
59 * Copyright (c) 1998-2007 The OpenSSL Project. All rights reserved.
61 * Redistribution and use in source and binary forms, with or without
62 * modification, are permitted provided that the following conditions
65 * 1. Redistributions of source code must retain the above copyright
66 * notice, this list of conditions and the following disclaimer.
68 * 2. Redistributions in binary form must reproduce the above copyright
69 * notice, this list of conditions and the following disclaimer in
70 * the documentation and/or other materials provided with the
73 * 3. All advertising materials mentioning features or use of this
74 * software must display the following acknowledgment:
75 * "This product includes software developed by the OpenSSL Project
76 * for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
78 * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
79 * endorse or promote products derived from this software without
80 * prior written permission. For written permission, please contact
81 * openssl-core@openssl.org.
83 * 5. Products derived from this software may not be called "OpenSSL"
84 * nor may "OpenSSL" appear in their names without prior written
85 * permission of the OpenSSL Project.
87 * 6. Redistributions of any form whatsoever must retain the following
89 * "This product includes software developed by the OpenSSL Project
90 * for use in the OpenSSL Toolkit (http://www.openssl.org/)"
92 * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
93 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
94 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
95 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR
96 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
97 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
98 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
99 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
100 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
101 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
102 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
103 * OF THE POSSIBILITY OF SUCH DAMAGE.
104 * ====================================================================
106 * This product includes cryptographic software written by Eric Young
107 * (eay@cryptsoft.com). This product includes software written by Tim
108 * Hudson (tjh@cryptsoft.com).
111 /* ====================================================================
112 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
114 * Portions of the attached software ("Contribution") are developed by
115 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
117 * The Contribution is licensed pursuant to the OpenSSL open source
118 * license provided above.
120 * ECC cipher suite support in OpenSSL originally written by
121 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
124 /* ====================================================================
125 * Copyright 2005 Nokia. All rights reserved.
127 * The portions of the attached software ("Contribution") is developed by
128 * Nokia Corporation and is licensed pursuant to the OpenSSL open source
131 * The Contribution, originally written by Mika Kousa and Pasi Eronen of
132 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
133 * support (see RFC 4279) to OpenSSL.
135 * No patent licenses or other rights except those expressly stated in
136 * the OpenSSL open source license shall be deemed granted or received
137 * expressly, by implication, estoppel, or otherwise.
139 * No assurances are provided by Nokia that the Contribution does not
140 * infringe the patent or other intellectual property rights of any third
141 * party or that the license provides you with all the necessary rights
142 * to make use of the Contribution.
144 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
145 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
146 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
147 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
151 #define REUSE_CIPHER_BUG
152 #define NETSCAPE_HANG_BUG
155 #include "ssl_locl.h"
156 #include "kssl_lcl.h"
157 #include "../crypto/constant_time_locl.h"
158 #include <openssl/buffer.h>
159 #include <openssl/rand.h>
160 #include <openssl/objects.h>
161 #include <openssl/evp.h>
162 #include <openssl/hmac.h>
163 #include <openssl/x509.h>
164 #ifndef OPENSSL_NO_DH
165 #include <openssl/dh.h>
167 #include <openssl/bn.h>
168 #ifndef OPENSSL_NO_KRB5
169 #include <openssl/krb5_asn.h>
171 #include <openssl/md5.h>
173 #ifndef OPENSSL_NO_SSL3_METHOD
174 static const SSL_METHOD *ssl3_get_server_method(int ver);
176 static const SSL_METHOD *ssl3_get_server_method(int ver)
178 if (ver == SSL3_VERSION)
179 return(SSLv3_server_method());
184 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
186 ssl_undefined_function,
187 ssl3_get_server_method)
190 #ifndef OPENSSL_NO_SRP
191 static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
193 int ret = SSL_ERROR_NONE;
195 *al = SSL_AD_UNRECOGNIZED_NAME;
197 if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
198 (s->srp_ctx.TLS_ext_srp_username_callback != NULL))
200 if(s->srp_ctx.login == NULL)
202 /* RFC 5054 says SHOULD reject,
203 we do so if There is no srp login name */
205 *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
209 ret = SSL_srp_server_param_with_username(s,al);
216 int ssl3_accept(SSL *s)
219 unsigned long alg_k,Time=(unsigned long)time(NULL);
220 void (*cb)(const SSL *ssl,int type,int val)=NULL;
222 int new_state,state,skip=0;
224 RAND_add(&Time,sizeof(Time),0);
228 if (s->info_callback != NULL)
230 else if (s->ctx->info_callback != NULL)
231 cb=s->ctx->info_callback;
233 /* init things to blank */
235 if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
239 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
243 #ifndef OPENSSL_NO_HEARTBEATS
244 /* If we're awaiting a HeartbeatResponse, pretend we
245 * already got and don't await it anymore, because
246 * Heartbeats don't make sense during handshakes anyway.
248 if (s->tlsext_hb_pending)
250 s->tlsext_hb_pending = 0;
261 case SSL_ST_RENEGOTIATE:
263 /* s->state=SSL_ST_ACCEPT; */
267 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
268 case SSL_ST_OK|SSL_ST_ACCEPT:
271 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
273 if ((s->version>>8) != 3)
275 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
278 s->type=SSL_ST_ACCEPT;
280 if (s->init_buf == NULL)
282 if ((buf=BUF_MEM_new()) == NULL)
287 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
295 if (!ssl3_setup_buffers(s))
302 s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
303 s->s3->flags &= ~TLS1_FLAGS_SKIP_CERT_VERIFY;
304 s->s3->flags &= ~SSL3_FLAGS_CCS_OK;
305 /* Should have been reset by ssl3_get_finished, too. */
306 s->s3->change_cipher_spec = 0;
308 if (s->state != SSL_ST_RENEGOTIATE)
310 /* Ok, we now need to push on a buffering BIO so that
311 * the output is sent in a way that TCP likes :-)
313 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
315 ssl3_init_finished_mac(s);
316 s->state=SSL3_ST_SR_CLNT_HELLO_A;
317 s->ctx->stats.sess_accept++;
319 else if (!s->s3->send_connection_binding &&
320 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
322 /* Server attempting to renegotiate with
323 * client that doesn't support secure
326 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
327 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
333 /* s->state == SSL_ST_RENEGOTIATE,
334 * we will just send a HelloRequest */
335 s->ctx->stats.sess_accept_renegotiate++;
336 s->state=SSL3_ST_SW_HELLO_REQ_A;
340 case SSL3_ST_SW_HELLO_REQ_A:
341 case SSL3_ST_SW_HELLO_REQ_B:
344 ret=ssl3_send_hello_request(s);
345 if (ret <= 0) goto end;
346 s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
347 s->state=SSL3_ST_SW_FLUSH;
350 ssl3_init_finished_mac(s);
353 case SSL3_ST_SW_HELLO_REQ_C:
357 case SSL3_ST_SR_CLNT_HELLO_A:
358 case SSL3_ST_SR_CLNT_HELLO_B:
359 case SSL3_ST_SR_CLNT_HELLO_C:
362 ret=ssl3_get_client_hello(s);
363 if (ret <= 0) goto end;
364 #ifndef OPENSSL_NO_SRP
365 s->state = SSL3_ST_SR_CLNT_HELLO_D;
366 case SSL3_ST_SR_CLNT_HELLO_D:
369 if ((ret = ssl_check_srp_ext_ClientHello(s,&al)) < 0)
371 /* callback indicates firther work to be done */
372 s->rwstate=SSL_X509_LOOKUP;
375 if (ret != SSL_ERROR_NONE)
377 ssl3_send_alert(s,SSL3_AL_FATAL,al);
378 /* This is not really an error but the only means to
379 for a client to detect whether srp is supported. */
380 if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)
381 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);
382 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
390 s->state=SSL3_ST_SW_SRVR_HELLO_A;
394 case SSL3_ST_SW_SRVR_HELLO_A:
395 case SSL3_ST_SW_SRVR_HELLO_B:
396 ret=ssl3_send_server_hello(s);
397 if (ret <= 0) goto end;
398 #ifndef OPENSSL_NO_TLSEXT
401 if (s->tlsext_ticket_expected)
402 s->state=SSL3_ST_SW_SESSION_TICKET_A;
404 s->state=SSL3_ST_SW_CHANGE_A;
408 s->state=SSL3_ST_SW_CHANGE_A;
411 s->state = SSL3_ST_SW_CERT_A;
415 case SSL3_ST_SW_CERT_A:
416 case SSL3_ST_SW_CERT_B:
417 /* Check if it is anon DH or anon ECDH, */
418 /* normal PSK or KRB5 or SRP */
419 if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aKRB5|SSL_aSRP))
420 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
422 ret=ssl3_send_server_certificate(s);
423 if (ret <= 0) goto end;
424 #ifndef OPENSSL_NO_TLSEXT
425 if (s->tlsext_status_expected)
426 s->state=SSL3_ST_SW_CERT_STATUS_A;
428 s->state=SSL3_ST_SW_KEY_EXCH_A;
433 s->state=SSL3_ST_SW_KEY_EXCH_A;
440 s->state=SSL3_ST_SW_KEY_EXCH_A;
445 case SSL3_ST_SW_KEY_EXCH_A:
446 case SSL3_ST_SW_KEY_EXCH_B:
447 alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
449 /* clear this, it may get reset by
450 * send_server_key_exchange */
451 if ((s->options & SSL_OP_EPHEMERAL_RSA)
452 #ifndef OPENSSL_NO_KRB5
453 && !(alg_k & SSL_kKRB5)
454 #endif /* OPENSSL_NO_KRB5 */
456 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
457 * even when forbidden by protocol specs
458 * (handshake may fail as clients are not required to
459 * be able to handle this) */
460 s->s3->tmp.use_rsa_tmp=1;
462 s->s3->tmp.use_rsa_tmp=0;
465 /* only send if a DH key exchange, fortezza or
466 * RSA but we have a sign only certificate
468 * PSK: may send PSK identity hints
470 * For ECC ciphersuites, we send a serverKeyExchange
471 * message only if the cipher suite is either
472 * ECDH-anon or ECDHE. In other cases, the
473 * server certificate contains the server's
474 * public key for key exchange.
476 if (s->s3->tmp.use_rsa_tmp
477 /* PSK: send ServerKeyExchange if PSK identity
478 * hint if provided */
479 #ifndef OPENSSL_NO_PSK
480 || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
482 #ifndef OPENSSL_NO_SRP
483 /* SRP: send ServerKeyExchange */
484 || (alg_k & SSL_kSRP)
486 || (alg_k & SSL_kEDH)
487 || (alg_k & SSL_kEECDH)
488 || ((alg_k & SSL_kRSA)
489 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
490 || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
491 && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
497 ret=ssl3_send_server_key_exchange(s);
498 if (ret <= 0) goto end;
503 s->state=SSL3_ST_SW_CERT_REQ_A;
507 case SSL3_ST_SW_CERT_REQ_A:
508 case SSL3_ST_SW_CERT_REQ_B:
509 if (/* don't request cert unless asked for it: */
510 !(s->verify_mode & SSL_VERIFY_PEER) ||
511 /* if SSL_VERIFY_CLIENT_ONCE is set,
512 * don't request cert during re-negotiation: */
513 ((s->session->peer != NULL) &&
514 (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
515 /* never request cert in anonymous ciphersuites
516 * (see section "Certificate request" in SSL 3 drafts
517 * and in RFC 2246): */
518 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
519 /* ... except when the application insists on verification
520 * (against the specs, but s3_clnt.c accepts this for SSL 3) */
521 !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
522 /* never request cert in Kerberos ciphersuites */
523 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) ||
524 /* don't request certificate for SRP auth */
525 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP)
526 /* With normal PSK Certificates and
527 * Certificate Requests are omitted */
528 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
530 /* no cert request */
532 s->s3->tmp.cert_request=0;
533 s->state=SSL3_ST_SW_SRVR_DONE_A;
534 if (s->s3->handshake_buffer)
535 if (!ssl3_digest_cached_records(s))
540 s->s3->tmp.cert_request=1;
541 ret=ssl3_send_certificate_request(s);
542 if (ret <= 0) goto end;
543 #ifndef NETSCAPE_HANG_BUG
544 s->state=SSL3_ST_SW_SRVR_DONE_A;
546 s->state=SSL3_ST_SW_FLUSH;
547 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
553 case SSL3_ST_SW_SRVR_DONE_A:
554 case SSL3_ST_SW_SRVR_DONE_B:
555 ret=ssl3_send_server_done(s);
556 if (ret <= 0) goto end;
557 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
558 s->state=SSL3_ST_SW_FLUSH;
562 case SSL3_ST_SW_FLUSH:
564 /* This code originally checked to see if
565 * any data was pending using BIO_CTRL_INFO
566 * and then flushed. This caused problems
567 * as documented in PR#1939. The proposed
568 * fix doesn't completely resolve this issue
569 * as buggy implementations of BIO_CTRL_PENDING
570 * still exist. So instead we just flush
574 s->rwstate=SSL_WRITING;
575 if (BIO_flush(s->wbio) <= 0)
580 s->rwstate=SSL_NOTHING;
582 s->state=s->s3->tmp.next_state;
585 case SSL3_ST_SR_CERT_A:
586 case SSL3_ST_SR_CERT_B:
587 /* Check for second client hello (MS SGC) */
588 ret = ssl3_check_client_hello(s);
592 s->state = SSL3_ST_SR_CLNT_HELLO_C;
594 if (s->s3->tmp.cert_request)
596 ret=ssl3_get_client_certificate(s);
597 if (ret <= 0) goto end;
600 s->state=SSL3_ST_SR_KEY_EXCH_A;
604 case SSL3_ST_SR_KEY_EXCH_A:
605 case SSL3_ST_SR_KEY_EXCH_B:
606 ret=ssl3_get_client_key_exchange(s);
611 /* For the ECDH ciphersuites when
612 * the client sends its ECDH pub key in
613 * a certificate, the CertificateVerify
614 * message is not sent.
615 * Also for GOST ciphersuites when
616 * the client uses its key from the certificate
619 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
620 s->state=SSL3_ST_SR_FINISHED_A;
622 if (s->s3->next_proto_neg_seen)
623 s->state=SSL3_ST_SR_NEXT_PROTO_A;
625 s->state=SSL3_ST_SR_FINISHED_A;
629 else if (SSL_USE_SIGALGS(s))
631 s->state=SSL3_ST_SR_CERT_VRFY_A;
633 if (!s->session->peer)
635 /* For sigalgs freeze the handshake buffer
636 * at this point and digest cached records.
638 if (!s->s3->handshake_buffer)
640 SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
643 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
644 if (!ssl3_digest_cached_records(s))
652 s->state=SSL3_ST_SR_CERT_VRFY_A;
655 /* We need to get hashes here so if there is
656 * a client cert, it can be verified
657 * FIXME - digest processing for CertificateVerify
658 * should be generalized. But it is next step
660 if (s->s3->handshake_buffer)
661 if (!ssl3_digest_cached_records(s))
663 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
664 if (s->s3->handshake_dgst[dgst_num])
668 s->method->ssl3_enc->cert_verify_mac(s,EVP_MD_CTX_type(s->s3->handshake_dgst[dgst_num]),&(s->s3->tmp.cert_verify_md[offset]));
669 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
680 case SSL3_ST_SR_CERT_VRFY_A:
681 case SSL3_ST_SR_CERT_VRFY_B:
683 * This *should* be the first time we enable CCS, but be
684 * extra careful about surrounding code changes. We need
685 * to set this here because we don't know if we're
686 * expecting a CertificateVerify or not.
688 if (!s->s3->change_cipher_spec)
689 s->s3->flags |= SSL3_FLAGS_CCS_OK;
690 /* we should decide if we expected this one */
691 ret=ssl3_get_cert_verify(s);
692 if (ret <= 0) goto end;
694 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
695 s->state=SSL3_ST_SR_FINISHED_A;
697 if (s->s3->next_proto_neg_seen)
698 s->state=SSL3_ST_SR_NEXT_PROTO_A;
700 s->state=SSL3_ST_SR_FINISHED_A;
705 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
706 case SSL3_ST_SR_NEXT_PROTO_A:
707 case SSL3_ST_SR_NEXT_PROTO_B:
709 * Enable CCS for resumed handshakes with NPN.
710 * In a full handshake with NPN, we end up here through
711 * SSL3_ST_SR_CERT_VRFY_B, where SSL3_FLAGS_CCS_OK was
712 * already set. Receiving a CCS clears the flag, so make
713 * sure not to re-enable it to ban duplicates.
714 * s->s3->change_cipher_spec is set when a CCS is
715 * processed in s3_pkt.c, and remains set until
716 * the client's Finished message is read.
718 if (!s->s3->change_cipher_spec)
719 s->s3->flags |= SSL3_FLAGS_CCS_OK;
721 ret=ssl3_get_next_proto(s);
722 if (ret <= 0) goto end;
724 s->state=SSL3_ST_SR_FINISHED_A;
728 case SSL3_ST_SR_FINISHED_A:
729 case SSL3_ST_SR_FINISHED_B:
731 * Enable CCS for resumed handshakes without NPN.
732 * In a full handshake, we end up here through
733 * SSL3_ST_SR_CERT_VRFY_B, where SSL3_FLAGS_CCS_OK was
734 * already set. Receiving a CCS clears the flag, so make
735 * sure not to re-enable it to ban duplicates.
736 * s->s3->change_cipher_spec is set when a CCS is
737 * processed in s3_pkt.c, and remains set until
738 * the client's Finished message is read.
740 if (!s->s3->change_cipher_spec)
741 s->s3->flags |= SSL3_FLAGS_CCS_OK;
742 ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
743 SSL3_ST_SR_FINISHED_B);
744 if (ret <= 0) goto end;
747 #ifndef OPENSSL_NO_TLSEXT
748 else if (s->tlsext_ticket_expected)
749 s->state=SSL3_ST_SW_SESSION_TICKET_A;
752 s->state=SSL3_ST_SW_CHANGE_A;
756 #ifndef OPENSSL_NO_TLSEXT
757 case SSL3_ST_SW_SESSION_TICKET_A:
758 case SSL3_ST_SW_SESSION_TICKET_B:
759 ret=ssl3_send_newsession_ticket(s);
760 if (ret <= 0) goto end;
761 s->state=SSL3_ST_SW_CHANGE_A;
765 case SSL3_ST_SW_CERT_STATUS_A:
766 case SSL3_ST_SW_CERT_STATUS_B:
767 ret=ssl3_send_cert_status(s);
768 if (ret <= 0) goto end;
769 s->state=SSL3_ST_SW_KEY_EXCH_A;
775 case SSL3_ST_SW_CHANGE_A:
776 case SSL3_ST_SW_CHANGE_B:
778 s->session->cipher=s->s3->tmp.new_cipher;
779 if (!s->method->ssl3_enc->setup_key_block(s))
780 { ret= -1; goto end; }
782 ret=ssl3_send_change_cipher_spec(s,
783 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
785 if (ret <= 0) goto end;
786 s->state=SSL3_ST_SW_FINISHED_A;
789 if (!s->method->ssl3_enc->change_cipher_state(s,
790 SSL3_CHANGE_CIPHER_SERVER_WRITE))
798 case SSL3_ST_SW_FINISHED_A:
799 case SSL3_ST_SW_FINISHED_B:
800 ret=ssl3_send_finished(s,
801 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
802 s->method->ssl3_enc->server_finished_label,
803 s->method->ssl3_enc->server_finished_label_len);
804 if (ret <= 0) goto end;
805 s->state=SSL3_ST_SW_FLUSH;
808 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
809 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
811 if (s->s3->next_proto_neg_seen)
813 s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
816 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
820 s->s3->tmp.next_state=SSL_ST_OK;
825 /* clean a few things up */
826 ssl3_cleanup_key_block(s);
828 BUF_MEM_free(s->init_buf);
831 /* remove buffering on output */
832 ssl_free_wbio_buffer(s);
836 if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
841 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
843 s->ctx->stats.sess_accept_good++;
845 s->handshake_func=ssl3_accept;
847 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
855 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
861 if (!s->s3->tmp.reuse_message && !skip)
865 if ((ret=BIO_flush(s->wbio)) <= 0)
870 if ((cb != NULL) && (s->state != state))
874 cb(s,SSL_CB_ACCEPT_LOOP,1);
881 /* BIO_flush(s->wbio); */
885 cb(s,SSL_CB_ACCEPT_EXIT,ret);
889 int ssl3_send_hello_request(SSL *s)
892 if (s->state == SSL3_ST_SW_HELLO_REQ_A)
894 ssl_set_handshake_header(s, SSL3_MT_HELLO_REQUEST, 0);
895 s->state=SSL3_ST_SW_HELLO_REQ_B;
898 /* SSL3_ST_SW_HELLO_REQ_B */
899 return ssl_do_write(s);
902 int ssl3_check_client_hello(SSL *s)
907 /* this function is called when we really expect a Certificate message,
908 * so permit appropriate message length */
909 n=s->method->ssl_get_message(s,
915 if (!ok) return((int)n);
916 s->s3->tmp.reuse_message = 1;
917 if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
919 /* We only allow the client to restart the handshake once per
921 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
923 SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
926 /* Throw away what we have done so far in the current handshake,
927 * which will now be aborted. (A full SSL_clear would be too much.) */
928 #ifndef OPENSSL_NO_DH
929 if (s->s3->tmp.dh != NULL)
931 DH_free(s->s3->tmp.dh);
932 s->s3->tmp.dh = NULL;
935 #ifndef OPENSSL_NO_ECDH
936 if (s->s3->tmp.ecdh != NULL)
938 EC_KEY_free(s->s3->tmp.ecdh);
939 s->s3->tmp.ecdh = NULL;
942 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
948 int ssl3_get_client_hello(SSL *s)
950 int i,j,ok,al=SSL_AD_INTERNAL_ERROR,ret= -1;
951 unsigned int cookie_len;
956 #ifndef OPENSSL_NO_COMP
960 STACK_OF(SSL_CIPHER) *ciphers=NULL;
962 if (s->state == SSL3_ST_SR_CLNT_HELLO_C && !s->first_packet)
965 /* We do this so that we will respond with our native type.
966 * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
967 * This down switching should be handled by a different method.
968 * If we are SSLv3, we will respond with SSLv3, even if prompted with
971 if (s->state == SSL3_ST_SR_CLNT_HELLO_A
974 s->state=SSL3_ST_SR_CLNT_HELLO_B;
977 n=s->method->ssl_get_message(s,
978 SSL3_ST_SR_CLNT_HELLO_B,
979 SSL3_ST_SR_CLNT_HELLO_C,
980 SSL3_MT_CLIENT_HELLO,
981 SSL3_RT_MAX_PLAIN_LENGTH,
984 if (!ok) return((int)n);
986 d=p=(unsigned char *)s->init_msg;
988 /* use version from inside client hello, not from record header
989 * (may differ: see RFC 2246, Appendix E, second paragraph) */
990 s->client_version=(((int)p[0])<<8)|(int)p[1];
993 if (SSL_IS_DTLS(s) ? (s->client_version > s->version &&
994 s->method->version != DTLS_ANY_VERSION)
995 : (s->client_version < s->version))
997 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
998 if ((s->client_version>>8) == SSL3_VERSION_MAJOR &&
999 !s->enc_write_ctx && !s->write_hash)
1001 /* similar to ssl3_get_record, send alert using remote version number */
1002 s->version = s->client_version;
1004 al = SSL_AD_PROTOCOL_VERSION;
1008 /* If we require cookies and this ClientHello doesn't
1009 * contain one, just return since we do not want to
1010 * allocate any memory yet. So check cookie length...
1012 if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
1014 unsigned int session_length, cookie_length;
1016 session_length = *(p + SSL3_RANDOM_SIZE);
1017 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
1019 if (cookie_length == 0)
1023 /* load the client random */
1024 memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
1025 p+=SSL3_RANDOM_SIZE;
1027 /* get the session-id */
1031 /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
1032 * 0.9.7 and later allow this by default, but optionally ignore resumption requests
1033 * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
1034 * than a change to default behavior so that applications relying on this for security
1035 * won't even compile against older library versions).
1037 * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1038 * renegotiation but not a new session (s->new_session remains unset): for servers,
1039 * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1040 * setting will be ignored.
1042 if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1044 if (!ssl_get_new_session(s,1))
1049 i=ssl_get_prev_session(s, p, j, d + n);
1051 * Only resume if the session's version matches the negotiated
1053 * RFC 5246 does not provide much useful advice on resumption
1054 * with a different protocol version. It doesn't forbid it but
1055 * the sanity of such behaviour would be questionable.
1056 * In practice, clients do not accept a version mismatch and
1057 * will abort the handshake with an error.
1059 if (i == 1 && s->version == s->session->ssl_version)
1060 { /* previous session */
1067 if (!ssl_get_new_session(s,1))
1077 cookie_len = *(p++);
1080 * The ClientHello may contain a cookie even if the
1081 * HelloVerify message has not been sent--make sure that it
1082 * does not cause an overflow.
1084 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1087 al = SSL_AD_DECODE_ERROR;
1088 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1092 /* verify the cookie if appropriate option is set. */
1093 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1096 memcpy(s->d1->rcvd_cookie, p, cookie_len);
1098 if ( s->ctx->app_verify_cookie_cb != NULL)
1100 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1103 al=SSL_AD_HANDSHAKE_FAILURE;
1104 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1105 SSL_R_COOKIE_MISMATCH);
1108 /* else cookie verification succeeded */
1110 else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
1111 s->d1->cookie_len) != 0) /* default verification */
1113 al=SSL_AD_HANDSHAKE_FAILURE;
1114 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1115 SSL_R_COOKIE_MISMATCH);
1118 /* Set to -2 so if successful we return 2 */
1123 if (s->method->version == DTLS_ANY_VERSION)
1125 /* Select version to use */
1126 if (s->client_version <= DTLS1_2_VERSION &&
1127 !(s->options & SSL_OP_NO_DTLSv1_2))
1129 s->version = DTLS1_2_VERSION;
1130 s->method = DTLSv1_2_server_method();
1132 else if (tls1_suiteb(s))
1134 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
1135 s->version = s->client_version;
1136 al = SSL_AD_PROTOCOL_VERSION;
1139 else if (s->client_version <= DTLS1_VERSION &&
1140 !(s->options & SSL_OP_NO_DTLSv1))
1142 s->version = DTLS1_VERSION;
1143 s->method = DTLSv1_server_method();
1147 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
1148 s->version = s->client_version;
1149 al = SSL_AD_PROTOCOL_VERSION;
1152 s->session->ssl_version = s->version;
1157 if ((i == 0) && (j != 0))
1159 /* we need a cipher if we are not resuming a session */
1160 al=SSL_AD_ILLEGAL_PARAMETER;
1161 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1166 /* not enough data */
1167 al=SSL_AD_DECODE_ERROR;
1168 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1171 if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1178 /* If it is a hit, check that the cipher is in the list */
1179 if ((s->hit) && (i > 0))
1182 id=s->session->cipher->id;
1185 printf("client sent %d ciphers\n",sk_num(ciphers));
1187 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1189 c=sk_SSL_CIPHER_value(ciphers,i);
1191 printf("client [%2d of %2d]:%s\n",
1192 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1200 /* Disabled because it can be used in a ciphersuite downgrade
1201 * attack: CVE-2010-4180.
1204 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1206 /* Special case as client bug workaround: the previously used cipher may
1207 * not be in the current list, the client instead might be trying to
1208 * continue using a cipher that before wasn't chosen due to server
1209 * preferences. We'll have to reject the connection if the cipher is not
1210 * enabled, though. */
1211 c = sk_SSL_CIPHER_value(ciphers, 0);
1212 if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1214 s->session->cipher = c;
1221 /* we need to have the cipher in the cipher
1222 * list if we are asked to reuse it */
1223 al=SSL_AD_ILLEGAL_PARAMETER;
1224 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1233 /* not enough data */
1234 al=SSL_AD_DECODE_ERROR;
1235 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1238 #ifndef OPENSSL_NO_COMP
1243 if (p[j] == 0) break;
1250 al=SSL_AD_DECODE_ERROR;
1251 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1255 #ifndef OPENSSL_NO_TLSEXT
1257 if (s->version >= SSL3_VERSION)
1259 if (!ssl_parse_clienthello_tlsext(s,&p,d,n))
1261 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1266 /* Check if we want to use external pre-shared secret for this
1267 * handshake for not reused session only. We need to generate
1268 * server_random before calling tls_session_secret_cb in order to allow
1269 * SessionTicket processing to use it in key derivation. */
1272 pos=s->s3->server_random;
1273 if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0)
1279 if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1281 SSL_CIPHER *pref_cipher=NULL;
1283 s->session->master_key_length=sizeof(s->session->master_key);
1284 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1285 ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1288 s->session->ciphers=ciphers;
1289 s->session->verify_result=X509_V_OK;
1293 /* check if some cipher was preferred by call back */
1294 pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1295 if (pref_cipher == NULL)
1297 al=SSL_AD_HANDSHAKE_FAILURE;
1298 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1302 s->session->cipher=pref_cipher;
1305 sk_SSL_CIPHER_free(s->cipher_list);
1307 if (s->cipher_list_by_id)
1308 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1310 s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1311 s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1316 /* Worst case, we will use the NULL compression, but if we have other
1317 * options, we will now look for them. We have i-1 compression
1318 * algorithms from the client, starting at q. */
1319 s->s3->tmp.new_compression=NULL;
1320 #ifndef OPENSSL_NO_COMP
1321 /* This only happens if we have a cache hit */
1322 if (s->session->compress_meth != 0)
1324 int m, comp_id = s->session->compress_meth;
1325 /* Perform sanity checks on resumed compression algorithm */
1326 /* Can't disable compression */
1327 if (s->options & SSL_OP_NO_COMPRESSION)
1329 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1332 /* Look for resumed compression method */
1333 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1335 comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1336 if (comp_id == comp->id)
1338 s->s3->tmp.new_compression=comp;
1342 if (s->s3->tmp.new_compression == NULL)
1344 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1347 /* Look for resumed method in compression list */
1348 for (m = 0; m < i; m++)
1350 if (q[m] == comp_id)
1355 al=SSL_AD_ILLEGAL_PARAMETER;
1356 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1362 else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1363 { /* See if we have a match */
1364 int m,nn,o,v,done=0;
1366 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1367 for (m=0; m<nn; m++)
1369 comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1382 s->s3->tmp.new_compression=comp;
1387 /* If compression is disabled we'd better not try to resume a session
1388 * using compression.
1390 if (s->session->compress_meth != 0)
1392 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1397 /* Given s->session->ciphers and SSL_get_ciphers, we must
1402 #ifdef OPENSSL_NO_COMP
1403 s->session->compress_meth=0;
1405 s->session->compress_meth=(comp == NULL)?0:comp->id;
1407 if (s->session->ciphers != NULL)
1408 sk_SSL_CIPHER_free(s->session->ciphers);
1409 s->session->ciphers=ciphers;
1410 if (ciphers == NULL)
1412 al=SSL_AD_ILLEGAL_PARAMETER;
1413 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1417 if (!tls1_set_server_sigalgs(s))
1419 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1422 /* Let cert callback update server certificates if required */
1424 if (s->cert->cert_cb)
1426 int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg);
1429 al=SSL_AD_INTERNAL_ERROR;
1430 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CERT_CB_ERROR);
1435 s->rwstate=SSL_X509_LOOKUP;
1438 s->rwstate = SSL_NOTHING;
1440 c=ssl3_choose_cipher(s,s->session->ciphers,
1441 SSL_get_ciphers(s));
1445 al=SSL_AD_HANDSHAKE_FAILURE;
1446 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1449 s->s3->tmp.new_cipher=c;
1453 /* Session-id reuse */
1454 #ifdef REUSE_CIPHER_BUG
1455 STACK_OF(SSL_CIPHER) *sk;
1456 SSL_CIPHER *nc=NULL;
1457 SSL_CIPHER *ec=NULL;
1459 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1461 sk=s->session->ciphers;
1462 for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1464 c=sk_SSL_CIPHER_value(sk,i);
1465 if (c->algorithm_enc & SSL_eNULL)
1467 if (SSL_C_IS_EXPORT(c))
1471 s->s3->tmp.new_cipher=nc;
1472 else if (ec != NULL)
1473 s->s3->tmp.new_cipher=ec;
1475 s->s3->tmp.new_cipher=s->session->cipher;
1479 s->s3->tmp.new_cipher=s->session->cipher;
1482 if (!SSL_USE_SIGALGS(s) || !(s->verify_mode & SSL_VERIFY_PEER))
1484 if (!ssl3_digest_cached_records(s))
1488 /* we now have the following setup.
1490 * cipher_list - our prefered list of ciphers
1491 * ciphers - the clients prefered list of ciphers
1492 * compression - basically ignored right now
1493 * ssl version is set - sslv3
1494 * s->session - The ssl session has been setup.
1495 * s->hit - session reuse flag
1496 * s->tmp.new_cipher - the new cipher to use.
1499 /* Handles TLS extensions that we couldn't check earlier */
1500 if (s->version >= SSL3_VERSION)
1502 if (ssl_check_clienthello_tlsext_late(s) <= 0)
1504 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1509 if (ret < 0) ret=-ret;
1513 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1516 if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1517 return ret < 0 ? -1 : ret;
1520 int ssl3_send_server_hello(SSL *s)
1523 unsigned char *p,*d;
1528 if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1530 buf=(unsigned char *)s->init_buf->data;
1531 #ifdef OPENSSL_NO_TLSEXT
1532 p=s->s3->server_random;
1533 if (ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE) <= 0)
1536 /* Do the message type and length last */
1537 d=p= ssl_handshake_start(s);
1539 *(p++)=s->version>>8;
1540 *(p++)=s->version&0xff;
1543 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1544 p+=SSL3_RANDOM_SIZE;
1546 /* There are several cases for the session ID to send
1547 * back in the server hello:
1548 * - For session reuse from the session cache,
1549 * we send back the old session ID.
1550 * - If stateless session reuse (using a session ticket)
1551 * is successful, we send back the client's "session ID"
1552 * (which doesn't actually identify the session).
1553 * - If it is a new session, we send back the new
1555 * - However, if we want the new session to be single-use,
1556 * we send back a 0-length session ID.
1557 * s->hit is non-zero in either case of session reuse,
1558 * so the following won't overwrite an ID that we're supposed
1561 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1563 s->session->session_id_length=0;
1565 sl=s->session->session_id_length;
1566 if (sl > (int)sizeof(s->session->session_id))
1568 SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1572 memcpy(p,s->session->session_id,sl);
1575 /* put the cipher */
1576 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1579 /* put the compression method */
1580 #ifdef OPENSSL_NO_COMP
1583 if (s->s3->tmp.new_compression == NULL)
1586 *(p++)=s->s3->tmp.new_compression->id;
1588 #ifndef OPENSSL_NO_TLSEXT
1589 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1591 SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1594 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL)
1596 ssl3_send_alert(s, SSL3_AL_FATAL, al);
1597 SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1603 ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l);
1604 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1607 /* SSL3_ST_SW_SRVR_HELLO_B */
1608 return ssl_do_write(s);
1611 int ssl3_send_server_done(SSL *s)
1614 if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1616 ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0);
1617 s->state = SSL3_ST_SW_SRVR_DONE_B;
1620 /* SSL3_ST_SW_SRVR_DONE_B */
1621 return ssl_do_write(s);
1624 int ssl3_send_server_key_exchange(SSL *s)
1626 #ifndef OPENSSL_NO_RSA
1630 unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1633 #ifndef OPENSSL_NO_DH
1636 #ifndef OPENSSL_NO_ECDH
1637 EC_KEY *ecdh=NULL, *ecdhp;
1638 unsigned char *encodedPoint = NULL;
1641 BN_CTX *bn_ctx = NULL;
1644 const EVP_MD *md = NULL;
1645 unsigned char *p,*d;
1655 EVP_MD_CTX_init(&md_ctx);
1656 if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1658 type=s->s3->tmp.new_cipher->algorithm_mkey;
1663 r[0]=r[1]=r[2]=r[3]=NULL;
1665 #ifndef OPENSSL_NO_RSA
1666 if (type & SSL_kRSA)
1669 if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1671 rsa=s->cert->rsa_tmp_cb(s,
1672 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1673 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1676 al=SSL_AD_HANDSHAKE_FAILURE;
1677 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1685 al=SSL_AD_HANDSHAKE_FAILURE;
1686 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1691 s->s3->tmp.use_rsa_tmp=1;
1695 #ifndef OPENSSL_NO_DH
1696 if (type & SSL_kEDH)
1699 if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1700 dhp=s->cert->dh_tmp_cb(s,
1701 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1702 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1705 al=SSL_AD_HANDSHAKE_FAILURE;
1706 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1710 if (s->s3->tmp.dh != NULL)
1712 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1716 if ((dh=DHparams_dup(dhp)) == NULL)
1718 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1723 if ((dhp->pub_key == NULL ||
1724 dhp->priv_key == NULL ||
1725 (s->options & SSL_OP_SINGLE_DH_USE)))
1727 if(!DH_generate_key(dh))
1729 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1736 dh->pub_key=BN_dup(dhp->pub_key);
1737 dh->priv_key=BN_dup(dhp->priv_key);
1738 if ((dh->pub_key == NULL) ||
1739 (dh->priv_key == NULL))
1741 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1751 #ifndef OPENSSL_NO_ECDH
1752 if (type & SSL_kEECDH)
1754 const EC_GROUP *group;
1756 ecdhp=cert->ecdh_tmp;
1757 if (s->cert->ecdh_tmp_auto)
1759 /* Get NID of appropriate shared curve */
1760 int nid = tls1_shared_curve(s, -2);
1761 if (nid != NID_undef)
1762 ecdhp = EC_KEY_new_by_curve_name(nid);
1764 else if ((ecdhp == NULL) && s->cert->ecdh_tmp_cb)
1766 ecdhp=s->cert->ecdh_tmp_cb(s,
1767 SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1768 SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1772 al=SSL_AD_HANDSHAKE_FAILURE;
1773 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1777 if (s->s3->tmp.ecdh != NULL)
1779 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1783 /* Duplicate the ECDH structure. */
1786 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1789 if (s->cert->ecdh_tmp_auto)
1791 else if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1793 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1797 s->s3->tmp.ecdh=ecdh;
1798 if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1799 (EC_KEY_get0_private_key(ecdh) == NULL) ||
1800 (s->options & SSL_OP_SINGLE_ECDH_USE))
1802 if(!EC_KEY_generate_key(ecdh))
1804 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1809 if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1810 (EC_KEY_get0_public_key(ecdh) == NULL) ||
1811 (EC_KEY_get0_private_key(ecdh) == NULL))
1813 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1817 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1818 (EC_GROUP_get_degree(group) > 163))
1820 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1824 /* XXX: For now, we only support ephemeral ECDH
1825 * keys over named (not generic) curves. For
1826 * supported named curves, curve_id is non-zero.
1829 tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1832 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1836 /* Encode the public key.
1837 * First check the size of encoding and
1838 * allocate memory accordingly.
1840 encodedlen = EC_POINT_point2oct(group,
1841 EC_KEY_get0_public_key(ecdh),
1842 POINT_CONVERSION_UNCOMPRESSED,
1845 encodedPoint = (unsigned char *)
1846 OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1847 bn_ctx = BN_CTX_new();
1848 if ((encodedPoint == NULL) || (bn_ctx == NULL))
1850 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1855 encodedlen = EC_POINT_point2oct(group,
1856 EC_KEY_get0_public_key(ecdh),
1857 POINT_CONVERSION_UNCOMPRESSED,
1858 encodedPoint, encodedlen, bn_ctx);
1860 if (encodedlen == 0)
1862 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1866 BN_CTX_free(bn_ctx); bn_ctx=NULL;
1868 /* XXX: For now, we only support named (not
1869 * generic) curves in ECDH ephemeral key exchanges.
1870 * In this situation, we need four additional bytes
1871 * to encode the entire ServerECDHParams
1876 /* We'll generate the serverKeyExchange message
1877 * explicitly so we can set these to NULLs
1885 #endif /* !OPENSSL_NO_ECDH */
1886 #ifndef OPENSSL_NO_PSK
1887 if (type & SSL_kPSK)
1889 /* reserve size for record length and PSK identity hint*/
1890 n+=2+strlen(s->ctx->psk_identity_hint);
1893 #endif /* !OPENSSL_NO_PSK */
1894 #ifndef OPENSSL_NO_SRP
1895 if (type & SSL_kSRP)
1897 if ((s->srp_ctx.N == NULL) ||
1898 (s->srp_ctx.g == NULL) ||
1899 (s->srp_ctx.s == NULL) ||
1900 (s->srp_ctx.B == NULL))
1902 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1913 al=SSL_AD_HANDSHAKE_FAILURE;
1914 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1917 for (i=0; i < 4 && r[i] != NULL; i++)
1919 nr[i]=BN_num_bytes(r[i]);
1920 #ifndef OPENSSL_NO_SRP
1921 if ((i == 2) && (type & SSL_kSRP))
1928 if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP))
1929 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1931 if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1934 al=SSL_AD_DECODE_ERROR;
1937 kn=EVP_PKEY_size(pkey);
1945 if (!BUF_MEM_grow_clean(buf,n+SSL_HM_HEADER_LENGTH(s)+kn))
1947 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1950 d = p = ssl_handshake_start(s);
1952 for (i=0; i < 4 && r[i] != NULL; i++)
1954 #ifndef OPENSSL_NO_SRP
1955 if ((i == 2) && (type & SSL_kSRP))
1967 #ifndef OPENSSL_NO_ECDH
1968 if (type & SSL_kEECDH)
1970 /* XXX: For now, we only support named (not generic) curves.
1971 * In this situation, the serverKeyExchange message has:
1972 * [1 byte CurveType], [2 byte CurveName]
1973 * [1 byte length of encoded point], followed by
1974 * the actual encoded point itself
1976 *p = NAMED_CURVE_TYPE;
1984 memcpy((unsigned char*)p,
1985 (unsigned char *)encodedPoint,
1987 OPENSSL_free(encodedPoint);
1988 encodedPoint = NULL;
1993 #ifndef OPENSSL_NO_PSK
1994 if (type & SSL_kPSK)
1996 /* copy PSK identity hint */
1997 s2n(strlen(s->ctx->psk_identity_hint), p);
1998 strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1999 p+=strlen(s->ctx->psk_identity_hint);
2006 /* n is the length of the params, they start at &(d[4])
2007 * and p points to the space at the end. */
2008 #ifndef OPENSSL_NO_RSA
2009 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
2013 for (num=2; num > 0; num--)
2015 EVP_MD_CTX_set_flags(&md_ctx,
2016 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
2017 EVP_DigestInit_ex(&md_ctx,(num == 2)
2018 ?s->ctx->md5:s->ctx->sha1, NULL);
2019 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2020 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2021 EVP_DigestUpdate(&md_ctx,d,n);
2022 EVP_DigestFinal_ex(&md_ctx,q,
2023 (unsigned int *)&i);
2027 if (RSA_sign(NID_md5_sha1, md_buf, j,
2028 &(p[2]), &u, pkey->pkey.rsa) <= 0)
2030 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
2040 /* send signature algorithm */
2041 if (SSL_USE_SIGALGS(s))
2043 if (!tls12_get_sigandhash(p, pkey, md))
2045 /* Should never happen */
2046 al=SSL_AD_INTERNAL_ERROR;
2047 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2053 fprintf(stderr, "Using hash %s\n",
2056 EVP_SignInit_ex(&md_ctx, md, NULL);
2057 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2058 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2059 EVP_SignUpdate(&md_ctx,d,n);
2060 if (!EVP_SignFinal(&md_ctx,&(p[2]),
2061 (unsigned int *)&i,pkey))
2063 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
2068 if (SSL_USE_SIGALGS(s))
2073 /* Is this error check actually needed? */
2074 al=SSL_AD_HANDSHAKE_FAILURE;
2075 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2080 ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n);
2083 s->state = SSL3_ST_SW_KEY_EXCH_B;
2084 EVP_MD_CTX_cleanup(&md_ctx);
2085 return ssl_do_write(s);
2087 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2089 #ifndef OPENSSL_NO_ECDH
2090 if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2091 BN_CTX_free(bn_ctx);
2093 EVP_MD_CTX_cleanup(&md_ctx);
2097 int ssl3_send_certificate_request(SSL *s)
2099 unsigned char *p,*d;
2101 STACK_OF(X509_NAME) *sk=NULL;
2105 if (s->state == SSL3_ST_SW_CERT_REQ_A)
2109 d=p=ssl_handshake_start(s);
2111 /* get the list of acceptable cert types */
2113 n=ssl3_get_req_cert_type(s,p);
2118 if (SSL_USE_SIGALGS(s))
2120 const unsigned char *psigs;
2121 nl = tls12_get_psigalgs(s, &psigs);
2123 memcpy(p, psigs, nl);
2132 sk=SSL_get_client_CA_list(s);
2136 for (i=0; i<sk_X509_NAME_num(sk); i++)
2138 name=sk_X509_NAME_value(sk,i);
2139 j=i2d_X509_NAME(name,NULL);
2140 if (!BUF_MEM_grow_clean(buf,SSL_HM_HEADER_LENGTH(s)+n+j+2))
2142 SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2145 p = ssl_handshake_start(s) + n;
2146 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2149 i2d_X509_NAME(name,&p);
2156 i2d_X509_NAME(name,&p);
2157 j-=2; s2n(j,d); j+=2;
2163 /* else no CA names */
2164 p = ssl_handshake_start(s) + off;
2167 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n);
2169 #ifdef NETSCAPE_HANG_BUG
2170 if (!SSL_IS_DTLS(s))
2172 if (!BUF_MEM_grow_clean(buf, s->init_num + 4))
2174 SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2177 p=(unsigned char *)s->init_buf->data + s->init_num;
2179 *(p++)=SSL3_MT_SERVER_DONE;
2187 s->state = SSL3_ST_SW_CERT_REQ_B;
2190 /* SSL3_ST_SW_CERT_REQ_B */
2191 return ssl_do_write(s);
2196 int ssl3_get_client_key_exchange(SSL *s)
2200 unsigned long alg_k;
2202 #ifndef OPENSSL_NO_RSA
2204 EVP_PKEY *pkey=NULL;
2206 #ifndef OPENSSL_NO_DH
2208 DH *dh_srvr, *dh_clnt = NULL;
2210 #ifndef OPENSSL_NO_KRB5
2212 #endif /* OPENSSL_NO_KRB5 */
2214 #ifndef OPENSSL_NO_ECDH
2215 EC_KEY *srvr_ecdh = NULL;
2216 EVP_PKEY *clnt_pub_pkey = NULL;
2217 EC_POINT *clnt_ecpoint = NULL;
2218 BN_CTX *bn_ctx = NULL;
2221 n=s->method->ssl_get_message(s,
2222 SSL3_ST_SR_KEY_EXCH_A,
2223 SSL3_ST_SR_KEY_EXCH_B,
2224 SSL3_MT_CLIENT_KEY_EXCHANGE,
2228 if (!ok) return((int)n);
2229 p=(unsigned char *)s->init_msg;
2231 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2233 #ifndef OPENSSL_NO_RSA
2234 if (alg_k & SSL_kRSA)
2236 unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
2238 unsigned char decrypt_good, version_good;
2240 /* FIX THIS UP EAY EAY EAY EAY */
2241 if (s->s3->tmp.use_rsa_tmp)
2243 if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2244 rsa=s->cert->rsa_tmp;
2245 /* Don't do a callback because rsa_tmp should
2246 * be sent already */
2249 al=SSL_AD_HANDSHAKE_FAILURE;
2250 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2257 pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2258 if ( (pkey == NULL) ||
2259 (pkey->type != EVP_PKEY_RSA) ||
2260 (pkey->pkey.rsa == NULL))
2262 al=SSL_AD_HANDSHAKE_FAILURE;
2263 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2269 /* TLS and [incidentally] DTLS{0xFEFF} */
2270 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2275 if (!(s->options & SSL_OP_TLS_D5_BUG))
2277 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2287 /* We must not leak whether a decryption failure occurs because
2288 * of Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see
2289 * RFC 2246, section 7.4.7.1). The code follows that advice of
2290 * the TLS RFC and generates a random premaster secret for the
2291 * case that the decrypt fails. See
2292 * https://tools.ietf.org/html/rfc5246#section-7.4.7.1 */
2294 /* should be RAND_bytes, but we cannot work around a failure. */
2295 if (RAND_pseudo_bytes(rand_premaster_secret,
2296 sizeof(rand_premaster_secret)) <= 0)
2298 decrypt_len = RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2301 /* decrypt_len should be SSL_MAX_MASTER_KEY_LENGTH.
2302 * decrypt_good will be 0xff if so and zero otherwise. */
2303 decrypt_good = constant_time_eq_int_8(decrypt_len, SSL_MAX_MASTER_KEY_LENGTH);
2305 /* If the version in the decrypted pre-master secret is correct
2306 * then version_good will be 0xff, otherwise it'll be zero.
2307 * The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2308 * (http://eprint.iacr.org/2003/052/) exploits the version
2309 * number check as a "bad version oracle". Thus version checks
2310 * are done in constant time and are treated like any other
2311 * decryption error. */
2312 version_good = constant_time_eq_8(p[0], (unsigned)(s->client_version>>8));
2313 version_good &= constant_time_eq_8(p[1], (unsigned)(s->client_version&0xff));
2315 /* The premaster secret must contain the same version number as
2316 * the ClientHello to detect version rollback attacks
2317 * (strangely, the protocol does not offer such protection for
2318 * DH ciphersuites). However, buggy clients exist that send the
2319 * negotiated protocol version instead if the server does not
2320 * support the requested protocol version. If
2321 * SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2322 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
2324 unsigned char workaround_good;
2325 workaround_good = constant_time_eq_8(p[0], (unsigned)(s->version>>8));
2326 workaround_good &= constant_time_eq_8(p[1], (unsigned)(s->version&0xff));
2327 version_good |= workaround_good;
2330 /* Both decryption and version must be good for decrypt_good
2331 * to remain non-zero (0xff). */
2332 decrypt_good &= version_good;
2334 /* Now copy rand_premaster_secret over p using
2335 * decrypt_good_mask. */
2336 for (i = 0; i < (int) sizeof(rand_premaster_secret); i++)
2338 p[i] = constant_time_select_8(decrypt_good, p[i],
2339 rand_premaster_secret[i]);
2342 s->session->master_key_length=
2343 s->method->ssl3_enc->generate_master_secret(s,
2344 s->session->master_key,
2346 OPENSSL_cleanse(p,i);
2350 #ifndef OPENSSL_NO_DH
2351 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2354 EVP_PKEY *skey = NULL;
2361 if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2363 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2372 if (alg_k & SSL_kDHr)
2373 idx = SSL_PKEY_DH_RSA;
2374 else if (alg_k & SSL_kDHd)
2375 idx = SSL_PKEY_DH_DSA;
2378 skey = s->cert->pkeys[idx].privatekey;
2379 if ((skey == NULL) ||
2380 (skey->type != EVP_PKEY_DH) ||
2381 (skey->pkey.dh == NULL))
2383 al=SSL_AD_HANDSHAKE_FAILURE;
2384 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2387 dh_srvr = skey->pkey.dh;
2389 else if (s->s3->tmp.dh == NULL)
2391 al=SSL_AD_HANDSHAKE_FAILURE;
2392 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2396 dh_srvr=s->s3->tmp.dh;
2400 /* Get pubkey from cert */
2401 EVP_PKEY *clkey=X509_get_pubkey(s->session->peer);
2404 if (EVP_PKEY_cmp_parameters(clkey, skey) == 1)
2405 dh_clnt = EVP_PKEY_get1_DH(clkey);
2407 if (dh_clnt == NULL)
2409 al=SSL_AD_HANDSHAKE_FAILURE;
2410 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2413 EVP_PKEY_free(clkey);
2414 pub = dh_clnt->pub_key;
2417 pub=BN_bin2bn(p,i,NULL);
2420 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2424 i=DH_compute_key(p,pub,dh_srvr);
2428 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2433 DH_free(s->s3->tmp.dh);
2440 s->session->master_key_length=
2441 s->method->ssl3_enc->generate_master_secret(s,
2442 s->session->master_key,p,i);
2443 OPENSSL_cleanse(p,i);
2449 #ifndef OPENSSL_NO_KRB5
2450 if (alg_k & SSL_kKRB5)
2452 krb5_error_code krb5rc;
2453 krb5_data enc_ticket;
2454 krb5_data authenticator;
2456 KSSL_CTX *kssl_ctx = s->kssl_ctx;
2457 EVP_CIPHER_CTX ciph_ctx;
2458 const EVP_CIPHER *enc = NULL;
2459 unsigned char iv[EVP_MAX_IV_LENGTH];
2460 unsigned char pms[SSL_MAX_MASTER_KEY_LENGTH
2461 + EVP_MAX_BLOCK_LENGTH];
2463 krb5_timestamp authtime = 0;
2464 krb5_ticket_times ttimes;
2466 EVP_CIPHER_CTX_init(&ciph_ctx);
2468 if (!kssl_ctx) kssl_ctx = kssl_ctx_new();
2471 enc_ticket.length = i;
2473 if (n < (long)(enc_ticket.length + 6))
2475 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2476 SSL_R_DATA_LENGTH_TOO_LONG);
2480 enc_ticket.data = (char *)p;
2481 p+=enc_ticket.length;
2484 authenticator.length = i;
2486 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2488 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2489 SSL_R_DATA_LENGTH_TOO_LONG);
2493 authenticator.data = (char *)p;
2494 p+=authenticator.length;
2498 enc_pms.data = (char *)p;
2501 /* Note that the length is checked again below,
2504 if(enc_pms.length > sizeof pms)
2506 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2507 SSL_R_DATA_LENGTH_TOO_LONG);
2511 if (n != (long)(enc_ticket.length + authenticator.length +
2512 enc_pms.length + 6))
2514 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2515 SSL_R_DATA_LENGTH_TOO_LONG);
2519 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2523 printf("kssl_sget_tkt rtn %d [%d]\n",
2524 krb5rc, kssl_err.reason);
2526 printf("kssl_err text= %s\n", kssl_err.text);
2527 #endif /* KSSL_DEBUG */
2528 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2533 /* Note: no authenticator is not considered an error,
2534 ** but will return authtime == 0.
2536 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2537 &authtime, &kssl_err)) != 0)
2540 printf("kssl_check_authent rtn %d [%d]\n",
2541 krb5rc, kssl_err.reason);
2543 printf("kssl_err text= %s\n", kssl_err.text);
2544 #endif /* KSSL_DEBUG */
2545 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2550 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2552 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2557 kssl_ctx_show(kssl_ctx);
2558 #endif /* KSSL_DEBUG */
2560 enc = kssl_map_enc(kssl_ctx->enctype);
2564 memset(iv, 0, sizeof iv); /* per RFC 1510 */
2566 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2568 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2569 SSL_R_DECRYPTION_FAILED);
2572 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2573 (unsigned char *)enc_pms.data, enc_pms.length))
2575 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2576 SSL_R_DECRYPTION_FAILED);
2579 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2581 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2582 SSL_R_DATA_LENGTH_TOO_LONG);
2585 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2587 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2588 SSL_R_DECRYPTION_FAILED);
2592 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2594 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2595 SSL_R_DATA_LENGTH_TOO_LONG);
2598 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2600 /* The premaster secret must contain the same version number as the
2601 * ClientHello to detect version rollback attacks (strangely, the
2602 * protocol does not offer such protection for DH ciphersuites).
2603 * However, buggy clients exist that send random bytes instead of
2604 * the protocol version.
2605 * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2606 * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2608 if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2610 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2611 SSL_AD_DECODE_ERROR);
2616 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2618 s->session->master_key_length=
2619 s->method->ssl3_enc->generate_master_secret(s,
2620 s->session->master_key, pms, outl);
2622 if (kssl_ctx->client_princ)
2624 size_t len = strlen(kssl_ctx->client_princ);
2625 if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2627 s->session->krb5_client_princ_len = len;
2628 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2633 /* Was doing kssl_ctx_free() here,
2634 ** but it caused problems for apache.
2635 ** kssl_ctx = kssl_ctx_free(kssl_ctx);
2636 ** if (s->kssl_ctx) s->kssl_ctx = NULL;
2640 #endif /* OPENSSL_NO_KRB5 */
2642 #ifndef OPENSSL_NO_ECDH
2643 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2648 const EC_GROUP *group;
2649 const BIGNUM *priv_key;
2651 /* initialize structures for server's ECDH key pair */
2652 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2654 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2655 ERR_R_MALLOC_FAILURE);
2659 /* Let's get server private key and group information */
2660 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2662 /* use the certificate */
2663 tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2667 /* use the ephermeral values we saved when
2668 * generating the ServerKeyExchange msg.
2670 tkey = s->s3->tmp.ecdh;
2673 group = EC_KEY_get0_group(tkey);
2674 priv_key = EC_KEY_get0_private_key(tkey);
2676 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2677 !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2679 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2684 /* Let's get client's public key */
2685 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2687 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2688 ERR_R_MALLOC_FAILURE);
2694 /* Client Publickey was in Client Certificate */
2696 if (alg_k & SSL_kEECDH)
2698 al=SSL_AD_HANDSHAKE_FAILURE;
2699 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2702 if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2704 (clnt_pub_pkey->type != EVP_PKEY_EC))
2706 /* XXX: For now, we do not support client
2707 * authentication using ECDH certificates
2708 * so this branch (n == 0L) of the code is
2709 * never executed. When that support is
2710 * added, we ought to ensure the key
2711 * received in the certificate is
2712 * authorized for key agreement.
2713 * ECDH_compute_key implicitly checks that
2714 * the two ECDH shares are for the same
2717 al=SSL_AD_HANDSHAKE_FAILURE;
2718 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2719 SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2723 if (EC_POINT_copy(clnt_ecpoint,
2724 EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2726 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2730 ret = 2; /* Skip certificate verify processing */
2734 /* Get client's public key from encoded point
2735 * in the ClientKeyExchange message.
2737 if ((bn_ctx = BN_CTX_new()) == NULL)
2739 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2740 ERR_R_MALLOC_FAILURE);
2744 /* Get encoded point length */
2749 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2753 if (EC_POINT_oct2point(group,
2754 clnt_ecpoint, p, i, bn_ctx) == 0)
2756 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2760 /* p is pointing to somewhere in the buffer
2761 * currently, so set it to the start
2763 p=(unsigned char *)s->init_buf->data;
2766 /* Compute the shared pre-master secret */
2767 field_size = EC_GROUP_get_degree(group);
2768 if (field_size <= 0)
2770 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2774 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2777 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2782 EVP_PKEY_free(clnt_pub_pkey);
2783 EC_POINT_free(clnt_ecpoint);
2784 EC_KEY_free(srvr_ecdh);
2785 BN_CTX_free(bn_ctx);
2786 EC_KEY_free(s->s3->tmp.ecdh);
2787 s->s3->tmp.ecdh = NULL;
2789 /* Compute the master secret */
2790 s->session->master_key_length = s->method->ssl3_enc-> \
2791 generate_master_secret(s, s->session->master_key, p, i);
2793 OPENSSL_cleanse(p, i);
2798 #ifndef OPENSSL_NO_PSK
2799 if (alg_k & SSL_kPSK)
2801 unsigned char *t = NULL;
2802 unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2803 unsigned int pre_ms_len = 0, psk_len = 0;
2805 char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2807 al=SSL_AD_HANDSHAKE_FAILURE;
2812 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2813 SSL_R_LENGTH_MISMATCH);
2816 if (i > PSK_MAX_IDENTITY_LEN)
2818 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2819 SSL_R_DATA_LENGTH_TOO_LONG);
2822 if (s->psk_server_callback == NULL)
2824 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2825 SSL_R_PSK_NO_SERVER_CB);
2829 /* Create guaranteed NULL-terminated identity
2830 * string for the callback */
2831 memcpy(tmp_id, p, i);
2832 memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2833 psk_len = s->psk_server_callback(s, tmp_id,
2834 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2835 OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2837 if (psk_len > PSK_MAX_PSK_LEN)
2839 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2840 ERR_R_INTERNAL_ERROR);
2843 else if (psk_len == 0)
2845 /* PSK related to the given identity not found */
2846 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2847 SSL_R_PSK_IDENTITY_NOT_FOUND);
2848 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2852 /* create PSK pre_master_secret */
2853 pre_ms_len=2+psk_len+2+psk_len;
2855 memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2857 memset(t, 0, psk_len);
2861 if (s->session->psk_identity != NULL)
2862 OPENSSL_free(s->session->psk_identity);
2863 s->session->psk_identity = BUF_strdup((char *)p);
2864 if (s->session->psk_identity == NULL)
2866 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2867 ERR_R_MALLOC_FAILURE);
2871 if (s->session->psk_identity_hint != NULL)
2872 OPENSSL_free(s->session->psk_identity_hint);
2873 s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2874 if (s->ctx->psk_identity_hint != NULL &&
2875 s->session->psk_identity_hint == NULL)
2877 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2878 ERR_R_MALLOC_FAILURE);
2882 s->session->master_key_length=
2883 s->method->ssl3_enc->generate_master_secret(s,
2884 s->session->master_key, psk_or_pre_ms, pre_ms_len);
2887 OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2893 #ifndef OPENSSL_NO_SRP
2894 if (alg_k & SSL_kSRP)
2902 al=SSL_AD_DECODE_ERROR;
2903 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2906 if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2908 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2911 if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0
2912 || BN_is_zero(s->srp_ctx.A))
2914 al=SSL_AD_ILLEGAL_PARAMETER;
2915 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
2918 if (s->session->srp_username != NULL)
2919 OPENSSL_free(s->session->srp_username);
2920 s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2921 if (s->session->srp_username == NULL)
2923 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2924 ERR_R_MALLOC_FAILURE);
2928 if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2930 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2937 #endif /* OPENSSL_NO_SRP */
2938 if (alg_k & SSL_kGOST)
2941 EVP_PKEY_CTX *pkey_ctx;
2942 EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2943 unsigned char premaster_secret[32], *start;
2944 size_t outlen=32, inlen;
2945 unsigned long alg_a;
2949 /* Get our certificate private key*/
2950 alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2951 if (alg_a & SSL_aGOST94)
2952 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2953 else if (alg_a & SSL_aGOST01)
2954 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2956 pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2957 EVP_PKEY_decrypt_init(pkey_ctx);
2958 /* If client certificate is present and is of the same type, maybe
2959 * use it for key exchange. Don't mind errors from
2960 * EVP_PKEY_derive_set_peer, because it is completely valid to use
2961 * a client certificate for authorization only. */
2962 client_pub_pkey = X509_get_pubkey(s->session->peer);
2963 if (client_pub_pkey)
2965 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2968 /* Decrypt session key */
2969 if (ASN1_get_object((const unsigned char **)&p, &Tlen, &Ttag, &Tclass, n) != V_ASN1_CONSTRUCTED ||
2970 Ttag != V_ASN1_SEQUENCE ||
2971 Tclass != V_ASN1_UNIVERSAL)
2973 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2978 if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
2981 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2984 /* Generate master secret */
2985 s->session->master_key_length=
2986 s->method->ssl3_enc->generate_master_secret(s,
2987 s->session->master_key,premaster_secret,32);
2988 /* Check if pubkey from client certificate was used */
2989 if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2994 EVP_PKEY_free(client_pub_pkey);
2995 EVP_PKEY_CTX_free(pkey_ctx);
3003 al=SSL_AD_HANDSHAKE_FAILURE;
3004 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
3005 SSL_R_UNKNOWN_CIPHER_TYPE);
3011 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3012 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
3015 #ifndef OPENSSL_NO_ECDH
3016 EVP_PKEY_free(clnt_pub_pkey);
3017 EC_POINT_free(clnt_ecpoint);
3018 if (srvr_ecdh != NULL)
3019 EC_KEY_free(srvr_ecdh);
3020 BN_CTX_free(bn_ctx);
3025 int ssl3_get_cert_verify(SSL *s)
3027 EVP_PKEY *pkey=NULL;
3033 const EVP_MD *md = NULL;
3035 EVP_MD_CTX_init(&mctx);
3037 n=s->method->ssl_get_message(s,
3038 SSL3_ST_SR_CERT_VRFY_A,
3039 SSL3_ST_SR_CERT_VRFY_B,
3041 SSL3_RT_MAX_PLAIN_LENGTH,
3044 if (!ok) return((int)n);
3046 if (s->session->peer != NULL)
3048 peer=s->session->peer;
3049 pkey=X509_get_pubkey(peer);
3050 type=X509_certificate_type(peer,pkey);
3058 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
3060 s->s3->tmp.reuse_message=1;
3061 if ((peer != NULL) && (type & EVP_PKT_SIGN))
3063 al=SSL_AD_UNEXPECTED_MESSAGE;
3064 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
3073 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
3074 al=SSL_AD_UNEXPECTED_MESSAGE;
3078 if (!(type & EVP_PKT_SIGN))
3080 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
3081 al=SSL_AD_ILLEGAL_PARAMETER;
3085 if (s->s3->change_cipher_spec)
3087 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
3088 al=SSL_AD_UNEXPECTED_MESSAGE;
3092 /* we now have a signature that we need to verify */
3093 p=(unsigned char *)s->init_msg;
3094 /* Check for broken implementations of GOST ciphersuites */
3095 /* If key is GOST and n is exactly 64, it is bare
3096 * signature without length field */
3097 if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
3098 pkey->type == NID_id_GostR3410_2001) )
3104 if (SSL_USE_SIGALGS(s))
3106 int rv = tls12_check_peer_sigalg(&md, s, p, pkey);
3109 al = SSL_AD_INTERNAL_ERROR;
3114 al = SSL_AD_DECODE_ERROR;
3118 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3127 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3128 al=SSL_AD_DECODE_ERROR;
3132 j=EVP_PKEY_size(pkey);
3133 if ((i > j) || (n > j) || (n <= 0))
3135 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3136 al=SSL_AD_DECODE_ERROR;
3140 if (SSL_USE_SIGALGS(s))
3144 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3147 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3148 al=SSL_AD_INTERNAL_ERROR;
3152 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3155 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3156 || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3158 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3159 al=SSL_AD_INTERNAL_ERROR;
3163 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3165 al=SSL_AD_DECRYPT_ERROR;
3166 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3171 #ifndef OPENSSL_NO_RSA
3172 if (pkey->type == EVP_PKEY_RSA)
3174 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3175 MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
3179 al=SSL_AD_DECRYPT_ERROR;
3180 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3185 al=SSL_AD_DECRYPT_ERROR;
3186 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3192 #ifndef OPENSSL_NO_DSA
3193 if (pkey->type == EVP_PKEY_DSA)
3195 j=DSA_verify(pkey->save_type,
3196 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3197 SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3201 al=SSL_AD_DECRYPT_ERROR;
3202 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3208 #ifndef OPENSSL_NO_ECDSA
3209 if (pkey->type == EVP_PKEY_EC)
3211 j=ECDSA_verify(pkey->save_type,
3212 &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3213 SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3217 al=SSL_AD_DECRYPT_ERROR;
3218 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3219 SSL_R_BAD_ECDSA_SIGNATURE);
3225 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3226 { unsigned char signature[64];
3228 EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3229 EVP_PKEY_verify_init(pctx);
3231 fprintf(stderr,"GOST signature length is %d",i);
3233 for (idx=0;idx<64;idx++) {
3234 signature[63-idx]=p[idx];
3236 j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3237 EVP_PKEY_CTX_free(pctx);
3240 al=SSL_AD_DECRYPT_ERROR;
3241 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3242 SSL_R_BAD_ECDSA_SIGNATURE);
3248 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3249 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3258 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3261 if (s->s3->handshake_buffer)
3263 BIO_free(s->s3->handshake_buffer);
3264 s->s3->handshake_buffer = NULL;
3265 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3267 EVP_MD_CTX_cleanup(&mctx);
3268 EVP_PKEY_free(pkey);
3272 int ssl3_get_client_certificate(SSL *s)
3274 int i,ok,al,ret= -1;
3276 unsigned long l,nc,llen,n;
3277 const unsigned char *p,*q;
3279 STACK_OF(X509) *sk=NULL;
3281 n=s->method->ssl_get_message(s,
3288 if (!ok) return((int)n);
3290 if (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3292 if ( (s->verify_mode & SSL_VERIFY_PEER) &&
3293 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3295 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3296 al=SSL_AD_HANDSHAKE_FAILURE;
3299 /* If tls asked for a client cert, the client must return a 0 list */
3300 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3302 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3303 al=SSL_AD_UNEXPECTED_MESSAGE;
3306 s->s3->tmp.reuse_message=1;
3310 if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3312 al=SSL_AD_UNEXPECTED_MESSAGE;
3313 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3316 p=d=(unsigned char *)s->init_msg;
3318 if ((sk=sk_X509_new_null()) == NULL)
3320 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3327 al=SSL_AD_DECODE_ERROR;
3328 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3331 for (nc=0; nc<llen; )
3334 if ((l+nc+3) > llen)
3336 al=SSL_AD_DECODE_ERROR;
3337 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3342 x=d2i_X509(NULL,&p,l);
3345 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3350 al=SSL_AD_DECODE_ERROR;
3351 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3354 if (!sk_X509_push(sk,x))
3356 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3363 if (sk_X509_num(sk) <= 0)
3365 /* TLS does not mind 0 certs returned */
3366 if (s->version == SSL3_VERSION)
3368 al=SSL_AD_HANDSHAKE_FAILURE;
3369 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3372 /* Fail for TLS only if we required a certificate */
3373 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3374 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3376 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3377 al=SSL_AD_HANDSHAKE_FAILURE;
3380 /* No client certificate so digest cached records */
3381 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s))
3383 al=SSL_AD_INTERNAL_ERROR;
3389 i=ssl_verify_cert_chain(s,sk);
3392 al=ssl_verify_alarm_type(s->verify_result);
3393 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
3398 if (s->session->peer != NULL) /* This should not be needed */
3399 X509_free(s->session->peer);
3400 s->session->peer=sk_X509_shift(sk);
3401 s->session->verify_result = s->verify_result;
3403 /* With the current implementation, sess_cert will always be NULL
3404 * when we arrive here. */
3405 if (s->session->sess_cert == NULL)
3407 s->session->sess_cert = ssl_sess_cert_new();
3408 if (s->session->sess_cert == NULL)
3410 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3414 if (s->session->sess_cert->cert_chain != NULL)
3415 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3416 s->session->sess_cert->cert_chain=sk;
3417 /* Inconsistency alert: cert_chain does *not* include the
3418 * peer's own certificate, while we do include it in s3_clnt.c */
3426 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3429 if (x != NULL) X509_free(x);
3430 if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3434 int ssl3_send_server_certificate(SSL *s)
3438 if (s->state == SSL3_ST_SW_CERT_A)
3440 cpk=ssl_get_server_send_pkey(s);
3443 /* VRS: allow null cert if auth == KRB5 */
3444 if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3445 (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3447 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3452 ssl3_output_cert_chain(s,cpk);
3453 s->state=SSL3_ST_SW_CERT_B;
3456 /* SSL3_ST_SW_CERT_B */
3457 return ssl_do_write(s);
3460 #ifndef OPENSSL_NO_TLSEXT
3461 /* send a new session ticket (not necessarily for a new session) */
3462 int ssl3_send_newsession_ticket(SSL *s)
3464 if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3466 unsigned char *p, *senc, *macstart;
3467 const unsigned char *const_p;
3468 int len, slen_full, slen;
3473 SSL_CTX *tctx = s->initial_ctx;
3474 unsigned char iv[EVP_MAX_IV_LENGTH];
3475 unsigned char key_name[16];
3477 /* get session encoding length */
3478 slen_full = i2d_SSL_SESSION(s->session, NULL);
3479 /* Some length values are 16 bits, so forget it if session is
3482 if (slen_full > 0xFF00)
3484 senc = OPENSSL_malloc(slen_full);
3488 i2d_SSL_SESSION(s->session, &p);
3490 /* create a fresh copy (not shared with other threads) to clean up */
3492 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3498 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
3500 slen = i2d_SSL_SESSION(sess, NULL);
3501 if (slen > slen_full) /* shouldn't ever happen */
3507 i2d_SSL_SESSION(sess, &p);
3508 SSL_SESSION_free(sess);
3510 /* Grow buffer if need be: the length calculation is as
3511 * follows handshake_header_length +
3512 * 4 (ticket lifetime hint) + 2 (ticket length) +
3513 * 16 (key name) + max_iv_len (iv length) +
3514 * session_length + max_enc_block_size (max encrypted session
3515 * length) + max_md_size (HMAC).
3517 if (!BUF_MEM_grow(s->init_buf,
3518 SSL_HM_HEADER_LENGTH(s) + 22 + EVP_MAX_IV_LENGTH +
3519 EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
3521 p = ssl_handshake_start(s);
3522 EVP_CIPHER_CTX_init(&ctx);
3523 HMAC_CTX_init(&hctx);
3524 /* Initialize HMAC and cipher contexts. If callback present
3525 * it does all the work otherwise use generated values
3528 if (tctx->tlsext_ticket_key_cb)
3530 if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3539 RAND_pseudo_bytes(iv, 16);
3540 EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3541 tctx->tlsext_tick_aes_key, iv);
3542 HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3543 tlsext_tick_md(), NULL);
3544 memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3547 /* Ticket lifetime hint (advisory only):
3548 * We leave this unspecified for resumed session (for simplicity),
3549 * and guess that tickets for new sessions will live as long
3550 * as their sessions. */
3551 l2n(s->hit ? 0 : s->session->timeout, p);
3553 /* Skip ticket length for now */
3555 /* Output key name */
3557 memcpy(p, key_name, 16);
3560 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3561 p += EVP_CIPHER_CTX_iv_length(&ctx);
3562 /* Encrypt session data */
3563 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3565 EVP_EncryptFinal(&ctx, p, &len);
3567 EVP_CIPHER_CTX_cleanup(&ctx);
3569 HMAC_Update(&hctx, macstart, p - macstart);
3570 HMAC_Final(&hctx, p, &hlen);
3571 HMAC_CTX_cleanup(&hctx);
3574 /* Now write out lengths: p points to end of data written */
3576 len = p - ssl_handshake_start(s);
3577 ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, len);
3578 /* Skip ticket lifetime hint */
3579 p = ssl_handshake_start(s) + 4;
3581 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3585 /* SSL3_ST_SW_SESSION_TICKET_B */
3586 return ssl_do_write(s);
3589 int ssl3_send_cert_status(SSL *s)
3591 if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3594 /* Grow buffer if need be: the length calculation is as
3595 * follows 1 (message type) + 3 (message length) +
3596 * 1 (ocsp response type) + 3 (ocsp response length)
3599 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3602 p=(unsigned char *)s->init_buf->data;
3605 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3606 /* message length */
3607 l2n3(s->tlsext_ocsp_resplen + 4, p);
3609 *(p++)= s->tlsext_status_type;
3610 /* length of OCSP response */
3611 l2n3(s->tlsext_ocsp_resplen, p);
3612 /* actual response */
3613 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3614 /* number of bytes to write */
3615 s->init_num = 8 + s->tlsext_ocsp_resplen;
3616 s->state=SSL3_ST_SW_CERT_STATUS_B;
3620 /* SSL3_ST_SW_CERT_STATUS_B */
3621 return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3624 # ifndef OPENSSL_NO_NEXTPROTONEG
3625 /* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It
3626 * sets the next_proto member in s if found */
3627 int ssl3_get_next_proto(SSL *s)
3630 int proto_len, padding_len;
3632 const unsigned char *p;
3634 /* Clients cannot send a NextProtocol message if we didn't see the
3635 * extension in their ClientHello */
3636 if (!s->s3->next_proto_neg_seen)
3638 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION);
3642 n=s->method->ssl_get_message(s,
3643 SSL3_ST_SR_NEXT_PROTO_A,
3644 SSL3_ST_SR_NEXT_PROTO_B,
3646 514, /* See the payload format below */
3652 /* s->state doesn't reflect whether ChangeCipherSpec has been received
3653 * in this handshake, but s->s3->change_cipher_spec does (will be reset
3654 * by ssl3_get_finished). */
3655 if (!s->s3->change_cipher_spec)
3657 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS);
3662 return 0; /* The body must be > 1 bytes long */
3664 p=(unsigned char *)s->init_msg;
3666 /* The payload looks like:
3668 * uint8 proto[proto_len];
3669 * uint8 padding_len;
3670 * uint8 padding[padding_len];
3673 if (proto_len + 2 > s->init_num)
3675 padding_len = p[proto_len + 1];
3676 if (proto_len + padding_len + 2 != s->init_num)
3679 s->next_proto_negotiated = OPENSSL_malloc(proto_len);
3680 if (!s->next_proto_negotiated)
3682 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,ERR_R_MALLOC_FAILURE);
3685 memcpy(s->next_proto_negotiated, p + 1, proto_len);
3686 s->next_proto_negotiated_len = proto_len;