ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   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.
   8  *
   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).
  15  *
  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.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  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)"
  40  *
  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
  51  * SUCH DAMAGE.
  52  *
  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.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  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
  71  *    distribution.
  72  *
  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/)"
  77  *
  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.
  82  *
  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.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  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  * ====================================================================
 105  *
 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).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124 /* ====================================================================
 125  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 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.
 134  *
 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.
 138  *
 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.
 143  *
 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
 148  * OTHERWISE.
 149  */
 150
 151 #define REUSE_CIPHER_BUG
 152 #define NETSCAPE_HANG_BUG
 153
 154 #include <stdio.h>
 155 #include "ssl_locl.h"
 156 #include "kssl_lcl.h"
 157 #include <openssl/buffer.h>
 158 #include <openssl/rand.h>
 159 #include <openssl/objects.h>
 160 #include <openssl/evp.h>
 161 #include <openssl/hmac.h>
 162 #include <openssl/x509.h>
 163 #ifndef OPENSSL_NO_DH
 164 #include <openssl/dh.h>
 165 #endif
 166 #include <openssl/bn.h>
 167 #ifndef OPENSSL_NO_KRB5
 168 #include <openssl/krb5_asn.h>
 169 #endif
 170 #include <openssl/md5.h>
 171
 172 static const SSL_METHOD *ssl3_get_server_method(int ver);
 173
 174 static const SSL_METHOD *ssl3_get_server_method(int ver)
 175         {
 176         if (ver == SSL3_VERSION)
 177                 return(SSLv3_server_method());
 178         else
 179                 return(NULL);
 180         }
 181
 182 #ifndef OPENSSL_NO_SRP
 183 static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
 184         {
 185         int ret = SSL_ERROR_NONE;
 186
 187         *al = SSL_AD_UNRECOGNIZED_NAME;
 188
 189         if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
 190             (s->srp_ctx.TLS_ext_srp_username_callback != NULL))
 191                 {
 192                 if(s->srp_ctx.login == NULL)
 193                         {
 194                         /* RFC 5054 says SHOULD reject,
 195                            we do so if There is no srp login name */
 196                         ret = SSL3_AL_FATAL;
 197                         *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
 198                         }
 199                 else
 200                         {
 201                         ret = SSL_srp_server_param_with_username(s,al);
 202                         }
 203                 }
 204         return ret;
 205         }
 206 #endif
 207
 208 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
 209                         ssl3_accept,
 210                         ssl_undefined_function,
 211                         ssl3_get_server_method)
 212
 213 int ssl3_accept(SSL *s)
 214         {
 215         BUF_MEM *buf;
 216         unsigned long alg_k,Time=(unsigned long)time(NULL);
 217         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 218         int ret= -1;
 219         int new_state,state,skip=0;
 220
 221         RAND_add(&Time,sizeof(Time),0);
 222         ERR_clear_error();
 223         clear_sys_error();
 224
 225         if (s->info_callback != NULL)
 226                 cb=s->info_callback;
 227         else if (s->ctx->info_callback != NULL)
 228                 cb=s->ctx->info_callback;
 229
 230         /* init things to blank */
 231         s->in_handshake++;
 232         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 233
 234         if (s->cert == NULL)
 235                 {
 236                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 237                 return(-1);
 238                 }
 239
 240 #ifndef OPENSSL_NO_HEARTBEATS
 241         /* If we're awaiting a HeartbeatResponse, pretend we
 242          * already got and don't await it anymore, because
 243          * Heartbeats don't make sense during handshakes anyway.
 244          */
 245         if (s->tlsext_hb_pending)
 246                 {
 247                 s->tlsext_hb_pending = 0;
 248                 s->tlsext_hb_seq++;
 249                 }
 250 #endif
 251
 252         for (;;)
 253                 {
 254                 state=s->state;
 255
 256                 switch (s->state)
 257                         {
 258                 case SSL_ST_RENEGOTIATE:
 259                         s->renegotiate=1;
 260                         /* s->state=SSL_ST_ACCEPT; */
 261
 262                 case SSL_ST_BEFORE:
 263                 case SSL_ST_ACCEPT:
 264                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 265                 case SSL_ST_OK|SSL_ST_ACCEPT:
 266
 267                         s->server=1;
 268                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 269
 270                         if ((s->version>>8) != 3)
 271                                 {
 272                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 273                                 return -1;
 274                                 }
 275                         s->type=SSL_ST_ACCEPT;
 276
 277                         if (s->init_buf == NULL)
 278                                 {
 279                                 if ((buf=BUF_MEM_new()) == NULL)
 280                                         {
 281                                         ret= -1;
 282                                         goto end;
 283                                         }
 284                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 285                                         {
 286                                         ret= -1;
 287                                         goto end;
 288                                         }
 289                                 s->init_buf=buf;
 290                                 }
 291
 292                         if (!ssl3_setup_buffers(s))
 293                                 {
 294                                 ret= -1;
 295                                 goto end;
 296                                 }
 297
 298                         s->init_num=0;
 299                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
 300
 301                         if (s->state != SSL_ST_RENEGOTIATE)
 302                                 {
 303                                 /* Ok, we now need to push on a buffering BIO so that
 304                                  * the output is sent in a way that TCP likes :-)
 305                                  */
 306                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 307
 308                                 ssl3_init_finished_mac(s);
 309                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 310                                 s->ctx->stats.sess_accept++;
 311                                 }
 312                         else if (!s->s3->send_connection_binding &&
 313                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
 314                                 {
 315                                 /* Server attempting to renegotiate with
 316                                  * client that doesn't support secure
 317                                  * renegotiation.
 318                                  */
 319                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
 320                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 321                                 ret = -1;
 322                                 goto end;
 323                                 }
 324                         else
 325                                 {
 326                                 /* s->state == SSL_ST_RENEGOTIATE,
 327                                  * we will just send a HelloRequest */
 328                                 s->ctx->stats.sess_accept_renegotiate++;
 329                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 330                                 }
 331                         break;
 332
 333                 case SSL3_ST_SW_HELLO_REQ_A:
 334                 case SSL3_ST_SW_HELLO_REQ_B:
 335
 336                         s->shutdown=0;
 337                         ret=ssl3_send_hello_request(s);
 338                         if (ret <= 0) goto end;
 339                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 340                         s->state=SSL3_ST_SW_FLUSH;
 341                         s->init_num=0;
 342
 343                         ssl3_init_finished_mac(s);
 344                         break;
 345
 346                 case SSL3_ST_SW_HELLO_REQ_C:
 347                         s->state=SSL_ST_OK;
 348                         break;
 349
 350                 case SSL3_ST_SR_CLNT_HELLO_A:
 351                 case SSL3_ST_SR_CLNT_HELLO_B:
 352                 case SSL3_ST_SR_CLNT_HELLO_C:
 353
 354                         s->shutdown=0;
 355                         if (s->rwstate != SSL_X509_LOOKUP)
 356                         {
 357                                 ret=ssl3_get_client_hello(s);
 358                                 if (ret <= 0) goto end;
 359                         }
 360 #ifndef OPENSSL_NO_SRP
 361                         {
 362                         int al;
 363                         if ((ret = ssl_check_srp_ext_ClientHello(s,&al))  < 0)
 364                                         {
 365                                         /* callback indicates firther work to be done */
 366                                         s->rwstate=SSL_X509_LOOKUP;
 367                                         goto end;
 368                                         }
 369                         if (ret != SSL_ERROR_NONE)
 370                                 {
 371                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 372                                 /* This is not really an error but the only means to
 373                                    for a client to detect whether srp is supported. */
 374                                    if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)
 375                                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);
 376                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
 377                                 ret= -1;
 378                                 goto end;
 379                                 }
 380                         }
 381 #endif
 382
 383                         s->renegotiate = 2;
 384                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 385                         s->init_num=0;
 386                         break;
 387
 388                 case SSL3_ST_SW_SRVR_HELLO_A:
 389                 case SSL3_ST_SW_SRVR_HELLO_B:
 390                         ret=ssl3_send_server_hello(s);
 391                         if (ret <= 0) goto end;
 392 #ifndef OPENSSL_NO_TLSEXT
 393                         if (s->hit)
 394                                 {
 395                                 if (s->tlsext_ticket_expected)
 396                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 397                                 else
 398                                         s->state=SSL3_ST_SW_CHANGE_A;
 399                                 }
 400 #else
 401                         if (s->hit)
 402                                         s->state=SSL3_ST_SW_CHANGE_A;
 403 #endif
 404                         else
 405                                 s->state=SSL3_ST_SW_CERT_A;
 406                         s->init_num=0;
 407                         break;
 408
 409                 case SSL3_ST_SW_CERT_A:
 410                 case SSL3_ST_SW_CERT_B:
 411                         /* Check if it is anon DH or anon ECDH, */
 412                         /* normal PSK or KRB5 or SRP */
 413                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
 414                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
 415                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
 416                                 {
 417                                 ret=ssl3_send_server_certificate(s);
 418                                 if (ret <= 0) goto end;
 419 #ifndef OPENSSL_NO_TLSEXT
 420                                 if (s->tlsext_status_expected)
 421                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 422                                 else
 423                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 424                                 }
 425                         else
 426                                 {
 427                                 skip = 1;
 428                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 429                                 }
 430 #else
 431                                 }
 432                         else
 433                                 skip=1;
 434
 435                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 436 #endif
 437                         s->init_num=0;
 438                         break;
 439
 440                 case SSL3_ST_SW_KEY_EXCH_A:
 441                 case SSL3_ST_SW_KEY_EXCH_B:
 442                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 443
 444                         /* clear this, it may get reset by
 445                          * send_server_key_exchange */
 446                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 447 #ifndef OPENSSL_NO_KRB5
 448                                 && !(alg_k & SSL_kKRB5)
 449 #endif /* OPENSSL_NO_KRB5 */
 450                                 )
 451                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 452                                  * even when forbidden by protocol specs
 453                                  * (handshake may fail as clients are not required to
 454                                  * be able to handle this) */
 455                                 s->s3->tmp.use_rsa_tmp=1;
 456                         else
 457                                 s->s3->tmp.use_rsa_tmp=0;
 458
 459
 460                         /* only send if a DH key exchange, fortezza or
 461                          * RSA but we have a sign only certificate
 462                          *
 463                          * PSK: may send PSK identity hints
 464                          *
 465                          * For ECC ciphersuites, we send a serverKeyExchange
 466                          * message only if the cipher suite is either
 467                          * ECDH-anon or ECDHE. In other cases, the
 468                          * server certificate contains the server's
 469                          * public key for key exchange.
 470                          */
 471                         if (s->s3->tmp.use_rsa_tmp
 472                         /* PSK: send ServerKeyExchange if PSK identity
 473                          * hint if provided */
 474 #ifndef OPENSSL_NO_PSK
 475                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 476 #endif
 477 #ifndef OPENSSL_NO_SRP
 478                             /* SRP: send ServerKeyExchange */
 479                             || (alg_k & SSL_kSRP)
 480 #endif
 481                             || (alg_k & (SSL_kDHr|SSL_kDHd|SSL_kEDH))
 482                             || (alg_k & SSL_kEECDH)
 483                             || ((alg_k & SSL_kRSA)
 484                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 485                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 486                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 487                                         )
 488                                     )
 489                                 )
 490                             )
 491                                 {
 492                                 ret=ssl3_send_server_key_exchange(s);
 493                                 if (ret <= 0) goto end;
 494                                 }
 495                         else
 496                                 skip=1;
 497
 498                         s->state=SSL3_ST_SW_CERT_REQ_A;
 499                         s->init_num=0;
 500                         break;
 501
 502                 case SSL3_ST_SW_CERT_REQ_A:
 503                 case SSL3_ST_SW_CERT_REQ_B:
 504                         if (/* don't request cert unless asked for it: */
 505                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 506                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 507                                  * don't request cert during re-negotiation: */
 508                                 ((s->session->peer != NULL) &&
 509                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 510                                 /* never request cert in anonymous ciphersuites
 511                                  * (see section "Certificate request" in SSL 3 drafts
 512                                  * and in RFC 2246): */
 513                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 514                                  /* ... except when the application insists on verification
 515                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 516                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 517                                  /* never request cert in Kerberos ciphersuites */
 518                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
 519                                 /* With normal PSK Certificates and
 520                                  * Certificate Requests are omitted */
 521                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 522                                 {
 523                                 /* no cert request */
 524                                 skip=1;
 525                                 s->s3->tmp.cert_request=0;
 526                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 527                                 if (s->s3->handshake_buffer)
 528                                         if (!ssl3_digest_cached_records(s))
 529                                                 return -1;
 530                                 }
 531                         else
 532                                 {
 533                                 s->s3->tmp.cert_request=1;
 534                                 ret=ssl3_send_certificate_request(s);
 535                                 if (ret <= 0) goto end;
 536 #ifndef NETSCAPE_HANG_BUG
 537                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 538 #else
 539                                 s->state=SSL3_ST_SW_FLUSH;
 540                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 541 #endif
 542                                 s->init_num=0;
 543                                 }
 544                         break;
 545
 546                 case SSL3_ST_SW_SRVR_DONE_A:
 547                 case SSL3_ST_SW_SRVR_DONE_B:
 548                         ret=ssl3_send_server_done(s);
 549                         if (ret <= 0) goto end;
 550                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 551                         s->state=SSL3_ST_SW_FLUSH;
 552                         s->init_num=0;
 553                         break;
 554
 555                 case SSL3_ST_SW_FLUSH:
 556
 557                         /* This code originally checked to see if
 558                          * any data was pending using BIO_CTRL_INFO
 559                          * and then flushed. This caused problems
 560                          * as documented in PR#1939. The proposed
 561                          * fix doesn't completely resolve this issue
 562                          * as buggy implementations of BIO_CTRL_PENDING
 563                          * still exist. So instead we just flush
 564                          * unconditionally.
 565                          */
 566
 567                         s->rwstate=SSL_WRITING;
 568                         if (BIO_flush(s->wbio) <= 0)
 569                                 {
 570                                 ret= -1;
 571                                 goto end;
 572                                 }
 573                         s->rwstate=SSL_NOTHING;
 574
 575                         s->state=s->s3->tmp.next_state;
 576                         break;
 577
 578                 case SSL3_ST_SR_CERT_A:
 579                 case SSL3_ST_SR_CERT_B:
 580                         /* Check for second client hello (MS SGC) */
 581                         ret = ssl3_check_client_hello(s);
 582                         if (ret <= 0)
 583                                 goto end;
 584                         if (ret == 2)
 585                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 586                         else {
 587                                 if (s->s3->tmp.cert_request)
 588                                         {
 589                                         ret=ssl3_get_client_certificate(s);
 590                                         if (ret <= 0) goto end;
 591                                         }
 592                                 s->init_num=0;
 593                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 594                         }
 595                         break;
 596
 597                 case SSL3_ST_SR_KEY_EXCH_A:
 598                 case SSL3_ST_SR_KEY_EXCH_B:
 599                         ret=ssl3_get_client_key_exchange(s);
 600                         if (ret <= 0)
 601                                 goto end;
 602                         if (ret == 2)
 603                                 {
 604                                 /* For the ECDH ciphersuites when
 605                                  * the client sends its ECDH pub key in
 606                                  * a certificate, the CertificateVerify
 607                                  * message is not sent.
 608                                  * Also for GOST ciphersuites when
 609                                  * the client uses its key from the certificate
 610                                  * for key exchange.
 611                                  */
 612 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 613                                 s->state=SSL3_ST_SR_FINISHED_A;
 614 #else
 615                                 if (s->s3->next_proto_neg_seen)
 616                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
 617                                 else
 618                                         s->state=SSL3_ST_SR_FINISHED_A;
 619 #endif
 620                                 s->init_num = 0;
 621                                 }
 622                         else if (TLS1_get_version(s) >= TLS1_2_VERSION)
 623                                 {
 624                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 625                                 s->init_num=0;
 626                                 if (!s->session->peer)
 627                                         break;
 628                                 /* For TLS v1.2 freeze the handshake buffer
 629                                  * at this point and digest cached records.
 630                                  */
 631                                 if (!s->s3->handshake_buffer)
 632                                         {
 633                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
 634                                         return -1;
 635                                         }
 636                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
 637                                 if (!ssl3_digest_cached_records(s))
 638                                         return -1;
 639                                 }
 640                         else
 641                                 {
 642                                 int offset=0;
 643                                 int dgst_num;
 644
 645                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 646                                 s->init_num=0;
 647
 648                                 /* We need to get hashes here so if there is
 649                                  * a client cert, it can be verified
 650                                  * FIXME - digest processing for CertificateVerify
 651                                  * should be generalized. But it is next step
 652                                  */
 653                                 if (s->s3->handshake_buffer)
 654                                         if (!ssl3_digest_cached_records(s))
 655                                                 return -1;
 656                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
 657                                         if (s->s3->handshake_dgst[dgst_num])
 658                                                 {
 659                                                 int dgst_size;
 660
 661                                                 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]));
 662                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
 663                                                 if (dgst_size < 0)
 664                                                         {
 665                                                         ret = -1;
 666                                                         goto end;
 667                                                         }
 668                                                 offset+=dgst_size;
 669                                                 }
 670                                 }
 671                         break;
 672
 673                 case SSL3_ST_SR_CERT_VRFY_A:
 674                 case SSL3_ST_SR_CERT_VRFY_B:
 675
 676                         /* we should decide if we expected this one */
 677                         ret=ssl3_get_cert_verify(s);
 678                         if (ret <= 0) goto end;
 679
 680 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 681                         s->state=SSL3_ST_SR_FINISHED_A;
 682 #else
 683                         if (s->s3->next_proto_neg_seen)
 684                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
 685                         else
 686                                 s->state=SSL3_ST_SR_FINISHED_A;
 687 #endif
 688                         s->init_num=0;
 689                         break;
 690
 691 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 692                 case SSL3_ST_SR_NEXT_PROTO_A:
 693                 case SSL3_ST_SR_NEXT_PROTO_B:
 694                         ret=ssl3_get_next_proto(s);
 695                         if (ret <= 0) goto end;
 696                         s->init_num = 0;
 697                         s->state=SSL3_ST_SR_FINISHED_A;
 698                         break;
 699 #endif
 700
 701                 case SSL3_ST_SR_FINISHED_A:
 702                 case SSL3_ST_SR_FINISHED_B:
 703                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 704                                 SSL3_ST_SR_FINISHED_B);
 705                         if (ret <= 0) goto end;
 706                         if (s->hit)
 707                                 s->state=SSL_ST_OK;
 708 #ifndef OPENSSL_NO_TLSEXT
 709                         else if (s->tlsext_ticket_expected)
 710                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 711 #endif
 712                         else
 713                                 s->state=SSL3_ST_SW_CHANGE_A;
 714                         s->init_num=0;
 715                         break;
 716
 717 #ifndef OPENSSL_NO_TLSEXT
 718                 case SSL3_ST_SW_SESSION_TICKET_A:
 719                 case SSL3_ST_SW_SESSION_TICKET_B:
 720                         ret=ssl3_send_newsession_ticket(s);
 721                         if (ret <= 0) goto end;
 722                         s->state=SSL3_ST_SW_CHANGE_A;
 723                         s->init_num=0;
 724                         break;
 725
 726                 case SSL3_ST_SW_CERT_STATUS_A:
 727                 case SSL3_ST_SW_CERT_STATUS_B:
 728                         ret=ssl3_send_cert_status(s);
 729                         if (ret <= 0) goto end;
 730                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 731                         s->init_num=0;
 732                         break;
 733
 734 #endif
 735
 736                 case SSL3_ST_SW_CHANGE_A:
 737                 case SSL3_ST_SW_CHANGE_B:
 738
 739                         s->session->cipher=s->s3->tmp.new_cipher;
 740                         if (!s->method->ssl3_enc->setup_key_block(s))
 741                                 { ret= -1; goto end; }
 742
 743                         ret=ssl3_send_change_cipher_spec(s,
 744                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 745
 746                         if (ret <= 0) goto end;
 747                         s->state=SSL3_ST_SW_FINISHED_A;
 748                         s->init_num=0;
 749
 750                         if (!s->method->ssl3_enc->change_cipher_state(s,
 751                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 752                                 {
 753                                 ret= -1;
 754                                 goto end;
 755                                 }
 756
 757                         break;
 758
 759                 case SSL3_ST_SW_FINISHED_A:
 760                 case SSL3_ST_SW_FINISHED_B:
 761                         ret=ssl3_send_finished(s,
 762                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 763                                 s->method->ssl3_enc->server_finished_label,
 764                                 s->method->ssl3_enc->server_finished_label_len);
 765                         if (ret <= 0) goto end;
 766                         s->state=SSL3_ST_SW_FLUSH;
 767                         if (s->hit)
 768                                 {
 769 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 770                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 771 #else
 772                                 if (s->s3->next_proto_neg_seen)
 773                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
 774                                 else
 775                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 776 #endif
 777                                 }
 778                         else
 779                                 s->s3->tmp.next_state=SSL_ST_OK;
 780                         s->init_num=0;
 781                         break;
 782
 783                 case SSL_ST_OK:
 784                         /* clean a few things up */
 785                         ssl3_cleanup_key_block(s);
 786
 787                         BUF_MEM_free(s->init_buf);
 788                         s->init_buf=NULL;
 789
 790                         /* remove buffering on output */
 791                         ssl_free_wbio_buffer(s);
 792
 793                         s->init_num=0;
 794
 795                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
 796                                 {
 797                                 s->renegotiate=0;
 798                                 s->new_session=0;
 799
 800                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 801
 802                                 s->ctx->stats.sess_accept_good++;
 803                                 /* s->server=1; */
 804                                 s->handshake_func=ssl3_accept;
 805
 806                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 807                                 }
 808
 809                         ret = 1;
 810                         goto end;
 811                         /* break; */
 812
 813                 default:
 814                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 815                         ret= -1;
 816                         goto end;
 817                         /* break; */
 818                         }
 819
 820                 if (!s->s3->tmp.reuse_message && !skip)
 821                         {
 822                         if (s->debug)
 823                                 {
 824                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 825                                         goto end;
 826                                 }
 827
 828
 829                         if ((cb != NULL) && (s->state != state))
 830                                 {
 831                                 new_state=s->state;
 832                                 s->state=state;
 833                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 834                                 s->state=new_state;
 835                                 }
 836                         }
 837                 skip=0;
 838                 }
 839 end:
 840         /* BIO_flush(s->wbio); */
 841
 842         s->in_handshake--;
 843         if (cb != NULL)
 844                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 845         return(ret);
 846         }
 847
 848 int ssl3_send_hello_request(SSL *s)
 849         {
 850         unsigned char *p;
 851
 852         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 853                 {
 854                 p=(unsigned char *)s->init_buf->data;
 855                 *(p++)=SSL3_MT_HELLO_REQUEST;
 856                 *(p++)=0;
 857                 *(p++)=0;
 858                 *(p++)=0;
 859
 860                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 861                 /* number of bytes to write */
 862                 s->init_num=4;
 863                 s->init_off=0;
 864                 }
 865
 866         /* SSL3_ST_SW_HELLO_REQ_B */
 867         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 868         }
 869
 870 int ssl3_check_client_hello(SSL *s)
 871         {
 872         int ok;
 873         long n;
 874
 875         /* this function is called when we really expect a Certificate message,
 876          * so permit appropriate message length */
 877         n=s->method->ssl_get_message(s,
 878                 SSL3_ST_SR_CERT_A,
 879                 SSL3_ST_SR_CERT_B,
 880                 -1,
 881                 s->max_cert_list,
 882                 &ok);
 883         if (!ok) return((int)n);
 884         s->s3->tmp.reuse_message = 1;
 885         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 886                 {
 887                 /* We only allow the client to restart the handshake once per
 888                  * negotiation. */
 889                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
 890                         {
 891                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
 892                         return -1;
 893                         }
 894                 /* Throw away what we have done so far in the current handshake,
 895                  * which will now be aborted. (A full SSL_clear would be too much.) */
 896 #ifndef OPENSSL_NO_DH
 897                 if (s->s3->tmp.dh != NULL)
 898                         {
 899                         DH_free(s->s3->tmp.dh);
 900                         s->s3->tmp.dh = NULL;
 901                         }
 902 #endif
 903 #ifndef OPENSSL_NO_ECDH
 904                 if (s->s3->tmp.ecdh != NULL)
 905                         {
 906                         EC_KEY_free(s->s3->tmp.ecdh);
 907                         s->s3->tmp.ecdh = NULL;
 908                         }
 909 #endif
 910                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
 911                 return 2;
 912                 }
 913         return 1;
 914 }
 915
 916 int ssl3_get_client_hello(SSL *s)
 917         {
 918         int i,j,ok,al,ret= -1;
 919         unsigned int cookie_len;
 920         long n;
 921         unsigned long id;
 922         unsigned char *p,*d,*q;
 923         SSL_CIPHER *c;
 924 #ifndef OPENSSL_NO_COMP
 925         SSL_COMP *comp=NULL;
 926 #endif
 927         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 928
 929         /* We do this so that we will respond with our native type.
 930          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 931          * This down switching should be handled by a different method.
 932          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 933          * TLSv1.
 934          */
 935         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
 936                 )
 937                 {
 938                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 939                 }
 940         s->first_packet=1;
 941         n=s->method->ssl_get_message(s,
 942                 SSL3_ST_SR_CLNT_HELLO_B,
 943                 SSL3_ST_SR_CLNT_HELLO_C,
 944                 SSL3_MT_CLIENT_HELLO,
 945                 SSL3_RT_MAX_PLAIN_LENGTH,
 946                 &ok);
 947
 948         if (!ok) return((int)n);
 949         s->first_packet=0;
 950         d=p=(unsigned char *)s->init_msg;
 951
 952         /* use version from inside client hello, not from record header
 953          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 954         s->client_version=(((int)p[0])<<8)|(int)p[1];
 955         p+=2;
 956
 957         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 958             (s->version != DTLS1_VERSION && s->client_version < s->version))
 959                 {
 960                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 961                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR &&
 962                         !s->enc_write_ctx && !s->write_hash)
 963                         {
 964                         /* similar to ssl3_get_record, send alert using remote version number */
 965                         s->version = s->client_version;
 966                         }
 967                 al = SSL_AD_PROTOCOL_VERSION;
 968                 goto f_err;
 969                 }
 970
 971         /* If we require cookies and this ClientHello doesn't
 972          * contain one, just return since we do not want to
 973          * allocate any memory yet. So check cookie length...
 974          */
 975         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
 976                 {
 977                 unsigned int session_length, cookie_length;
 978
 979                 session_length = *(p + SSL3_RANDOM_SIZE);
 980                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
 981
 982                 if (cookie_length == 0)
 983                         return 1;
 984                 }
 985
 986         /* load the client random */
 987         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 988         p+=SSL3_RANDOM_SIZE;
 989
 990         /* get the session-id */
 991         j= *(p++);
 992
 993         s->hit=0;
 994         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
 995          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
 996          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
 997          * than a change to default behavior so that applications relying on this for security
 998          * won't even compile against older library versions).
 999          *
1000          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1001          * renegotiation but not a new session (s->new_session remains unset): for servers,
1002          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1003          * setting will be ignored.
1004          */
1005         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1006                 {
1007                 if (!ssl_get_new_session(s,1))
1008                         goto err;
1009                 }
1010         else
1011                 {
1012                 i=ssl_get_prev_session(s, p, j, d + n);
1013                 if (i == 1)
1014                         { /* previous session */
1015                         s->hit=1;
1016                         }
1017                 else if (i == -1)
1018                         goto err;
1019                 else /* i == 0 */
1020                         {
1021                         if (!ssl_get_new_session(s,1))
1022                                 goto err;
1023                         }
1024                 }
1025
1026         p+=j;
1027
1028         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1029                 {
1030                 /* cookie stuff */
1031                 cookie_len = *(p++);
1032
1033                 /*
1034                  * The ClientHello may contain a cookie even if the
1035                  * HelloVerify message has not been sent--make sure that it
1036                  * does not cause an overflow.
1037                  */
1038                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1039                         {
1040                         /* too much data */
1041                         al = SSL_AD_DECODE_ERROR;
1042                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1043                         goto f_err;
1044                         }
1045
1046                 /* verify the cookie if appropriate option is set. */
1047                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1048                         cookie_len > 0)
1049                         {
1050                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1051
1052                         if ( s->ctx->app_verify_cookie_cb != NULL)
1053                                 {
1054                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1055                                         cookie_len) == 0)
1056                                         {
1057                                         al=SSL_AD_HANDSHAKE_FAILURE;
1058                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1059                                                 SSL_R_COOKIE_MISMATCH);
1060                                         goto f_err;
1061                                         }
1062                                 /* else cookie verification succeeded */
1063                                 }
1064                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
1065                                                   s->d1->cookie_len) != 0) /* default verification */
1066                                 {
1067                                         al=SSL_AD_HANDSHAKE_FAILURE;
1068                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1069                                                 SSL_R_COOKIE_MISMATCH);
1070                                         goto f_err;
1071                                 }
1072
1073                         ret = 2;
1074                         }
1075
1076                 p += cookie_len;
1077                 }
1078
1079         n2s(p,i);
1080         if ((i == 0) && (j != 0))
1081                 {
1082                 /* we need a cipher if we are not resuming a session */
1083                 al=SSL_AD_ILLEGAL_PARAMETER;
1084                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1085                 goto f_err;
1086                 }
1087         if ((p+i) >= (d+n))
1088                 {
1089                 /* not enough data */
1090                 al=SSL_AD_DECODE_ERROR;
1091                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1092                 goto f_err;
1093                 }
1094         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1095                 == NULL))
1096                 {
1097                 goto err;
1098                 }
1099         p+=i;
1100
1101         /* If it is a hit, check that the cipher is in the list */
1102         if ((s->hit) && (i > 0))
1103                 {
1104                 j=0;
1105                 id=s->session->cipher->id;
1106
1107 #ifdef CIPHER_DEBUG
1108                 printf("client sent %d ciphers\n",sk_num(ciphers));
1109 #endif
1110                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1111                         {
1112                         c=sk_SSL_CIPHER_value(ciphers,i);
1113 #ifdef CIPHER_DEBUG
1114                         printf("client [%2d of %2d]:%s\n",
1115                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1116 #endif
1117                         if (c->id == id)
1118                                 {
1119                                 j=1;
1120                                 break;
1121                                 }
1122                         }
1123 /* Disabled because it can be used in a ciphersuite downgrade
1124  * attack: CVE-2010-4180.
1125  */
1126 #if 0
1127                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1128                         {
1129                         /* Special case as client bug workaround: the previously used cipher may
1130                          * not be in the current list, the client instead might be trying to
1131                          * continue using a cipher that before wasn't chosen due to server
1132                          * preferences.  We'll have to reject the connection if the cipher is not
1133                          * enabled, though. */
1134                         c = sk_SSL_CIPHER_value(ciphers, 0);
1135                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1136                                 {
1137                                 s->session->cipher = c;
1138                                 j = 1;
1139                                 }
1140                         }
1141 #endif
1142                 if (j == 0)
1143                         {
1144                         /* we need to have the cipher in the cipher
1145                          * list if we are asked to reuse it */
1146                         al=SSL_AD_ILLEGAL_PARAMETER;
1147                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1148                         goto f_err;
1149                         }
1150                 }
1151
1152         /* compression */
1153         i= *(p++);
1154         if ((p+i) > (d+n))
1155                 {
1156                 /* not enough data */
1157                 al=SSL_AD_DECODE_ERROR;
1158                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1159                 goto f_err;
1160                 }
1161         q=p;
1162         for (j=0; j<i; j++)
1163                 {
1164                 if (p[j] == 0) break;
1165                 }
1166
1167         p+=i;
1168         if (j >= i)
1169                 {
1170                 /* no compress */
1171                 al=SSL_AD_DECODE_ERROR;
1172                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1173                 goto f_err;
1174                 }
1175
1176 #ifndef OPENSSL_NO_TLSEXT
1177         /* TLS extensions*/
1178         if (s->version >= SSL3_VERSION)
1179                 {
1180                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1181                         {
1182                         /* 'al' set by ssl_parse_clienthello_tlsext */
1183                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1184                         goto f_err;
1185                         }
1186                 }
1187                 if (ssl_check_clienthello_tlsext_early(s) <= 0) {
1188                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1189                         goto err;
1190                 }
1191
1192         /* Check if we want to use external pre-shared secret for this
1193          * handshake for not reused session only. We need to generate
1194          * server_random before calling tls_session_secret_cb in order to allow
1195          * SessionTicket processing to use it in key derivation. */
1196         {
1197                 unsigned char *pos;
1198                 pos=s->s3->server_random;
1199                 if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0)
1200                         {
1201                         al=SSL_AD_INTERNAL_ERROR;
1202                         goto f_err;
1203                         }
1204         }
1205
1206         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1207                 {
1208                 SSL_CIPHER *pref_cipher=NULL;
1209
1210                 s->session->master_key_length=sizeof(s->session->master_key);
1211                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1212                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1213                         {
1214                         s->hit=1;
1215                         s->session->ciphers=ciphers;
1216                         s->session->verify_result=X509_V_OK;
1217
1218                         ciphers=NULL;
1219
1220                         /* check if some cipher was preferred by call back */
1221                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1222                         if (pref_cipher == NULL)
1223                                 {
1224                                 al=SSL_AD_HANDSHAKE_FAILURE;
1225                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1226                                 goto f_err;
1227                                 }
1228
1229                         s->session->cipher=pref_cipher;
1230
1231                         if (s->cipher_list)
1232                                 sk_SSL_CIPHER_free(s->cipher_list);
1233
1234                         if (s->cipher_list_by_id)
1235                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1236
1237                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1238                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1239                         }
1240                 }
1241 #endif
1242
1243         /* Worst case, we will use the NULL compression, but if we have other
1244          * options, we will now look for them.  We have i-1 compression
1245          * algorithms from the client, starting at q. */
1246         s->s3->tmp.new_compression=NULL;
1247 #ifndef OPENSSL_NO_COMP
1248         /* This only happens if we have a cache hit */
1249         if (s->session->compress_meth != 0)
1250                 {
1251                 int m, comp_id = s->session->compress_meth;
1252                 /* Perform sanity checks on resumed compression algorithm */
1253                 /* Can't disable compression */
1254                 if (s->options & SSL_OP_NO_COMPRESSION)
1255                         {
1256                         al=SSL_AD_INTERNAL_ERROR;
1257                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1258                         goto f_err;
1259                         }
1260                 /* Look for resumed compression method */
1261                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1262                         {
1263                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1264                         if (comp_id == comp->id)
1265                                 {
1266                                 s->s3->tmp.new_compression=comp;
1267                                 break;
1268                                 }
1269                         }
1270                 if (s->s3->tmp.new_compression == NULL)
1271                         {
1272                         al=SSL_AD_INTERNAL_ERROR;
1273                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1274                         goto f_err;
1275                         }
1276                 /* Look for resumed method in compression list */
1277                 for (m = 0; m < i; m++)
1278                         {
1279                         if (q[m] == comp_id)
1280                                 break;
1281                         }
1282                 if (m >= i)
1283                         {
1284                         al=SSL_AD_ILLEGAL_PARAMETER;
1285                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1286                         goto f_err;
1287                         }
1288                 }
1289         else if (s->hit)
1290                 comp = NULL;
1291         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1292                 { /* See if we have a match */
1293                 int m,nn,o,v,done=0;
1294
1295                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1296                 for (m=0; m<nn; m++)
1297                         {
1298                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1299                         v=comp->id;
1300                         for (o=0; o<i; o++)
1301                                 {
1302                                 if (v == q[o])
1303                                         {
1304                                         done=1;
1305                                         break;
1306                                         }
1307                                 }
1308                         if (done) break;
1309                         }
1310                 if (done)
1311                         s->s3->tmp.new_compression=comp;
1312                 else
1313                         comp=NULL;
1314                 }
1315 #else
1316         /* If compression is disabled we'd better not try to resume a session
1317          * using compression.
1318          */
1319         if (s->session->compress_meth != 0)
1320                 {
1321                 al=SSL_AD_INTERNAL_ERROR;
1322                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1323                 goto f_err;
1324                 }
1325 #endif
1326
1327         /* Given s->session->ciphers and SSL_get_ciphers, we must
1328          * pick a cipher */
1329
1330         if (!s->hit)
1331                 {
1332 #ifdef OPENSSL_NO_COMP
1333                 s->session->compress_meth=0;
1334 #else
1335                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1336 #endif
1337                 if (s->session->ciphers != NULL)
1338                         sk_SSL_CIPHER_free(s->session->ciphers);
1339                 s->session->ciphers=ciphers;
1340                 if (ciphers == NULL)
1341                         {
1342                         al=SSL_AD_ILLEGAL_PARAMETER;
1343                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1344                         goto f_err;
1345                         }
1346                 ciphers=NULL;
1347                 c=ssl3_choose_cipher(s,s->session->ciphers,
1348                                      SSL_get_ciphers(s));
1349
1350                 if (c == NULL)
1351                         {
1352                         al=SSL_AD_HANDSHAKE_FAILURE;
1353                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1354                         goto f_err;
1355                         }
1356                 s->s3->tmp.new_cipher=c;
1357                 }
1358         else
1359                 {
1360                 /* Session-id reuse */
1361 #ifdef REUSE_CIPHER_BUG
1362                 STACK_OF(SSL_CIPHER) *sk;
1363                 SSL_CIPHER *nc=NULL;
1364                 SSL_CIPHER *ec=NULL;
1365
1366                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1367                         {
1368                         sk=s->session->ciphers;
1369                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1370                                 {
1371                                 c=sk_SSL_CIPHER_value(sk,i);
1372                                 if (c->algorithm_enc & SSL_eNULL)
1373                                         nc=c;
1374                                 if (SSL_C_IS_EXPORT(c))
1375                                         ec=c;
1376                                 }
1377                         if (nc != NULL)
1378                                 s->s3->tmp.new_cipher=nc;
1379                         else if (ec != NULL)
1380                                 s->s3->tmp.new_cipher=ec;
1381                         else
1382                                 s->s3->tmp.new_cipher=s->session->cipher;
1383                         }
1384                 else
1385 #endif
1386                 s->s3->tmp.new_cipher=s->session->cipher;
1387                 }
1388
1389         if (TLS1_get_version(s) < TLS1_2_VERSION || !(s->verify_mode & SSL_VERIFY_PEER))
1390                 {
1391                 if (!ssl3_digest_cached_records(s))
1392                         {
1393                         al = SSL_AD_INTERNAL_ERROR;
1394                         goto f_err;
1395                         }
1396                 }
1397
1398         /* we now have the following setup.
1399          * client_random
1400          * cipher_list          - our prefered list of ciphers
1401          * ciphers              - the clients prefered list of ciphers
1402          * compression          - basically ignored right now
1403          * ssl version is set   - sslv3
1404          * s->session           - The ssl session has been setup.
1405          * s->hit               - session reuse flag
1406          * s->tmp.new_cipher    - the new cipher to use.
1407          */
1408
1409         /* Handles TLS extensions that we couldn't check earlier */
1410         if (s->version >= SSL3_VERSION)
1411                 {
1412                 if (ssl_check_clienthello_tlsext_late(s) <= 0)
1413                         {
1414                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1415                         goto err;
1416                         }
1417                 }
1418
1419         if (ret < 0) ret=1;
1420         if (0)
1421                 {
1422 f_err:
1423                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1424                 }
1425 err:
1426         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1427         return(ret);
1428         }
1429
1430 int ssl3_send_server_hello(SSL *s)
1431         {
1432         unsigned char *buf;
1433         unsigned char *p,*d;
1434         int i,sl;
1435         unsigned long l;
1436
1437         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1438                 {
1439                 buf=(unsigned char *)s->init_buf->data;
1440 #ifdef OPENSSL_NO_TLSEXT
1441                 p=s->s3->server_random;
1442                 if (ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE) <= 0)
1443                         return -1;
1444 #endif
1445                 /* Do the message type and length last */
1446                 d=p= &(buf[4]);
1447
1448                 *(p++)=s->version>>8;
1449                 *(p++)=s->version&0xff;
1450
1451                 /* Random stuff */
1452                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1453                 p+=SSL3_RANDOM_SIZE;
1454
1455                 /* There are several cases for the session ID to send
1456                  * back in the server hello:
1457                  * - For session reuse from the session cache,
1458                  *   we send back the old session ID.
1459                  * - If stateless session reuse (using a session ticket)
1460                  *   is successful, we send back the client's "session ID"
1461                  *   (which doesn't actually identify the session).
1462                  * - If it is a new session, we send back the new
1463                  *   session ID.
1464                  * - However, if we want the new session to be single-use,
1465                  *   we send back a 0-length session ID.
1466                  * s->hit is non-zero in either case of session reuse,
1467                  * so the following won't overwrite an ID that we're supposed
1468                  * to send back.
1469                  */
1470                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1471                         && !s->hit)
1472                         s->session->session_id_length=0;
1473
1474                 sl=s->session->session_id_length;
1475                 if (sl > (int)sizeof(s->session->session_id))
1476                         {
1477                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1478                         return -1;
1479                         }
1480                 *(p++)=sl;
1481                 memcpy(p,s->session->session_id,sl);
1482                 p+=sl;
1483
1484                 /* put the cipher */
1485                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1486                 p+=i;
1487
1488                 /* put the compression method */
1489 #ifdef OPENSSL_NO_COMP
1490                         *(p++)=0;
1491 #else
1492                 if (s->s3->tmp.new_compression == NULL)
1493                         *(p++)=0;
1494                 else
1495                         *(p++)=s->s3->tmp.new_compression->id;
1496 #endif
1497 #ifndef OPENSSL_NO_TLSEXT
1498                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1499                         {
1500                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1501                         return -1;
1502                         }
1503                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1504                         {
1505                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1506                         return -1;
1507                         }
1508 #endif
1509                 /* do the header */
1510                 l=(p-d);
1511                 d=buf;
1512                 *(d++)=SSL3_MT_SERVER_HELLO;
1513                 l2n3(l,d);
1514
1515                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1516                 /* number of bytes to write */
1517                 s->init_num=p-buf;
1518                 s->init_off=0;
1519                 }
1520
1521         /* SSL3_ST_SW_SRVR_HELLO_B */
1522         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1523         }
1524
1525 int ssl3_send_server_done(SSL *s)
1526         {
1527         unsigned char *p;
1528
1529         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1530                 {
1531                 p=(unsigned char *)s->init_buf->data;
1532
1533                 /* do the header */
1534                 *(p++)=SSL3_MT_SERVER_DONE;
1535                 *(p++)=0;
1536                 *(p++)=0;
1537                 *(p++)=0;
1538
1539                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1540                 /* number of bytes to write */
1541                 s->init_num=4;
1542                 s->init_off=0;
1543                 }
1544
1545         /* SSL3_ST_SW_SRVR_DONE_B */
1546         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1547         }
1548
1549 int ssl3_send_server_key_exchange(SSL *s)
1550         {
1551 #ifndef OPENSSL_NO_RSA
1552         unsigned char *q;
1553         int j,num;
1554         RSA *rsa;
1555         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1556         unsigned int u;
1557 #endif
1558 #ifndef OPENSSL_NO_DH
1559         DH *dh=NULL,*dhp;
1560 #endif
1561 #ifndef OPENSSL_NO_ECDH
1562         EC_KEY *ecdh=NULL, *ecdhp;
1563         unsigned char *encodedPoint = NULL;
1564         int encodedlen = 0;
1565         int curve_id = 0;
1566         BN_CTX *bn_ctx = NULL;
1567 #endif
1568         EVP_PKEY *pkey;
1569         const EVP_MD *md = NULL;
1570         unsigned char *p,*d;
1571         int al,i;
1572         unsigned long type;
1573         int n;
1574         CERT *cert;
1575         BIGNUM *r[4];
1576         int nr[4],kn;
1577         BUF_MEM *buf;
1578         EVP_MD_CTX md_ctx;
1579
1580         EVP_MD_CTX_init(&md_ctx);
1581         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1582                 {
1583                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1584                 cert=s->cert;
1585
1586                 buf=s->init_buf;
1587
1588                 r[0]=r[1]=r[2]=r[3]=NULL;
1589                 n=0;
1590 #ifndef OPENSSL_NO_RSA
1591                 if (type & SSL_kRSA)
1592                         {
1593                         rsa=cert->rsa_tmp;
1594                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1595                                 {
1596                                 rsa=s->cert->rsa_tmp_cb(s,
1597                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1598                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1599                                 if(rsa == NULL)
1600                                 {
1601                                         al=SSL_AD_HANDSHAKE_FAILURE;
1602                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1603                                         goto f_err;
1604                                 }
1605                                 RSA_up_ref(rsa);
1606                                 cert->rsa_tmp=rsa;
1607                                 }
1608                         if (rsa == NULL)
1609                                 {
1610                                 al=SSL_AD_HANDSHAKE_FAILURE;
1611                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1612                                 goto f_err;
1613                                 }
1614                         r[0]=rsa->n;
1615                         r[1]=rsa->e;
1616                         s->s3->tmp.use_rsa_tmp=1;
1617                         }
1618                 else
1619 #endif
1620 #ifndef OPENSSL_NO_DH
1621                         if (type & SSL_kEDH)
1622                         {
1623                         dhp=cert->dh_tmp;
1624                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1625                                 dhp=s->cert->dh_tmp_cb(s,
1626                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1627                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1628                         if (dhp == NULL)
1629                                 {
1630                                 al=SSL_AD_HANDSHAKE_FAILURE;
1631                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1632                                 goto f_err;
1633                                 }
1634
1635                         if (s->s3->tmp.dh != NULL)
1636                                 {
1637                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1638                                 goto err;
1639                                 }
1640
1641                         if ((dh=DHparams_dup(dhp)) == NULL)
1642                                 {
1643                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1644                                 goto err;
1645                                 }
1646
1647                         s->s3->tmp.dh=dh;
1648                         if ((dhp->pub_key == NULL ||
1649                              dhp->priv_key == NULL ||
1650                              (s->options & SSL_OP_SINGLE_DH_USE)))
1651                                 {
1652                                 if(!DH_generate_key(dh))
1653                                     {
1654                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1655                                            ERR_R_DH_LIB);
1656                                     goto err;
1657                                     }
1658                                 }
1659                         else
1660                                 {
1661                                 dh->pub_key=BN_dup(dhp->pub_key);
1662                                 dh->priv_key=BN_dup(dhp->priv_key);
1663                                 if ((dh->pub_key == NULL) ||
1664                                         (dh->priv_key == NULL))
1665                                         {
1666                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1667                                         goto err;
1668                                         }
1669                                 }
1670                         r[0]=dh->p;
1671                         r[1]=dh->g;
1672                         r[2]=dh->pub_key;
1673                         }
1674                 else
1675 #endif
1676 #ifndef OPENSSL_NO_ECDH
1677                         if (type & SSL_kEECDH)
1678                         {
1679                         const EC_GROUP *group;
1680
1681                         ecdhp=cert->ecdh_tmp;
1682                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1683                                 {
1684                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1685                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1686                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1687                                 }
1688                         if (ecdhp == NULL)
1689                                 {
1690                                 al=SSL_AD_HANDSHAKE_FAILURE;
1691                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1692                                 goto f_err;
1693                                 }
1694
1695                         if (s->s3->tmp.ecdh != NULL)
1696                                 {
1697                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1698                                 goto err;
1699                                 }
1700
1701                         /* Duplicate the ECDH structure. */
1702                         if (ecdhp == NULL)
1703                                 {
1704                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1705                                 goto err;
1706                                 }
1707                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1708                                 {
1709                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1710                                 goto err;
1711                                 }
1712
1713                         s->s3->tmp.ecdh=ecdh;
1714                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1715                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1716                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1717                                 {
1718                                 if(!EC_KEY_generate_key(ecdh))
1719                                     {
1720                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1721                                     goto err;
1722                                     }
1723                                 }
1724
1725                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1726                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1727                             (EC_KEY_get0_private_key(ecdh) == NULL))
1728                                 {
1729                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1730                                 goto err;
1731                                 }
1732
1733                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1734                             (EC_GROUP_get_degree(group) > 163))
1735                                 {
1736                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1737                                 goto err;
1738                                 }
1739
1740                         /* XXX: For now, we only support ephemeral ECDH
1741                          * keys over named (not generic) curves. For
1742                          * supported named curves, curve_id is non-zero.
1743                          */
1744                         if ((curve_id =
1745                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1746                             == 0)
1747                                 {
1748                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1749                                 goto err;
1750                                 }
1751
1752                         /* Encode the public key.
1753                          * First check the size of encoding and
1754                          * allocate memory accordingly.
1755                          */
1756                         encodedlen = EC_POINT_point2oct(group,
1757                             EC_KEY_get0_public_key(ecdh),
1758                             POINT_CONVERSION_UNCOMPRESSED,
1759                             NULL, 0, NULL);
1760
1761                         encodedPoint = (unsigned char *)
1762                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1763                         bn_ctx = BN_CTX_new();
1764                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1765                                 {
1766                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1767                                 goto err;
1768                                 }
1769
1770
1771                         encodedlen = EC_POINT_point2oct(group,
1772                             EC_KEY_get0_public_key(ecdh),
1773                             POINT_CONVERSION_UNCOMPRESSED,
1774                             encodedPoint, encodedlen, bn_ctx);
1775
1776                         if (encodedlen == 0)
1777                                 {
1778                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1779                                 goto err;
1780                                 }
1781
1782                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1783
1784                         /* XXX: For now, we only support named (not
1785                          * generic) curves in ECDH ephemeral key exchanges.
1786                          * In this situation, we need four additional bytes
1787                          * to encode the entire ServerECDHParams
1788                          * structure.
1789                          */
1790                         n = 4 + encodedlen;
1791
1792                         /* We'll generate the serverKeyExchange message
1793                          * explicitly so we can set these to NULLs
1794                          */
1795                         r[0]=NULL;
1796                         r[1]=NULL;
1797                         r[2]=NULL;
1798                         r[3]=NULL;
1799                         }
1800                 else
1801 #endif /* !OPENSSL_NO_ECDH */
1802 #ifndef OPENSSL_NO_PSK
1803                         if (type & SSL_kPSK)
1804                                 {
1805                                 /* reserve size for record length and PSK identity hint*/
1806                                 n+=2+strlen(s->ctx->psk_identity_hint);
1807                                 }
1808                         else
1809 #endif /* !OPENSSL_NO_PSK */
1810 #ifndef OPENSSL_NO_SRP
1811                 if (type & SSL_kSRP)
1812                         {
1813                         if ((s->srp_ctx.N == NULL) ||
1814                                 (s->srp_ctx.g == NULL) ||
1815                                 (s->srp_ctx.s == NULL) ||
1816                                 (s->srp_ctx.B == NULL))
1817                                 {
1818                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1819                                 goto err;
1820                                 }
1821                         r[0]=s->srp_ctx.N;
1822                         r[1]=s->srp_ctx.g;
1823                         r[2]=s->srp_ctx.s;
1824                         r[3]=s->srp_ctx.B;
1825                         }
1826                 else
1827 #endif
1828                         {
1829                         al=SSL_AD_HANDSHAKE_FAILURE;
1830                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1831                         goto f_err;
1832                         }
1833                 for (i=0; r[i] != NULL && i<4; i++)
1834                         {
1835                         nr[i]=BN_num_bytes(r[i]);
1836 #ifndef OPENSSL_NO_SRP
1837                         if ((i == 2) && (type & SSL_kSRP))
1838                                 n+=1+nr[i];
1839                         else
1840 #endif
1841                         n+=2+nr[i];
1842                         }
1843
1844                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1845                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1846                         {
1847                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1848                                 == NULL)
1849                                 {
1850                                 al=SSL_AD_DECODE_ERROR;
1851                                 goto f_err;
1852                                 }
1853                         kn=EVP_PKEY_size(pkey);
1854                         }
1855                 else
1856                         {
1857                         pkey=NULL;
1858                         kn=0;
1859                         }
1860
1861                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1862                         {
1863                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1864                         goto err;
1865                         }
1866                 d=(unsigned char *)s->init_buf->data;
1867                 p= &(d[4]);
1868
1869                 for (i=0; r[i] != NULL && i<4; i++)
1870                         {
1871 #ifndef OPENSSL_NO_SRP
1872                         if ((i == 2) && (type & SSL_kSRP))
1873                                 {
1874                                 *p = nr[i];
1875                                 p++;
1876                                 }
1877                         else
1878 #endif
1879                         s2n(nr[i],p);
1880                         BN_bn2bin(r[i],p);
1881                         p+=nr[i];
1882                         }
1883
1884 #ifndef OPENSSL_NO_ECDH
1885                 if (type & SSL_kEECDH)
1886                         {
1887                         /* XXX: For now, we only support named (not generic) curves.
1888                          * In this situation, the serverKeyExchange message has:
1889                          * [1 byte CurveType], [2 byte CurveName]
1890                          * [1 byte length of encoded point], followed by
1891                          * the actual encoded point itself
1892                          */
1893                         *p = NAMED_CURVE_TYPE;
1894                         p += 1;
1895                         *p = 0;
1896                         p += 1;
1897                         *p = curve_id;
1898                         p += 1;
1899                         *p = encodedlen;
1900                         p += 1;
1901                         memcpy((unsigned char*)p,
1902                             (unsigned char *)encodedPoint,
1903                             encodedlen);
1904                         OPENSSL_free(encodedPoint);
1905                         encodedPoint = NULL;
1906                         p += encodedlen;
1907                         }
1908 #endif
1909
1910 #ifndef OPENSSL_NO_PSK
1911                 if (type & SSL_kPSK)
1912                         {
1913                         /* copy PSK identity hint */
1914                         s2n(strlen(s->ctx->psk_identity_hint), p);
1915                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1916                         p+=strlen(s->ctx->psk_identity_hint);
1917                         }
1918 #endif
1919
1920                 /* not anonymous */
1921                 if (pkey != NULL)
1922                         {
1923                         /* n is the length of the params, they start at &(d[4])
1924                          * and p points to the space at the end. */
1925 #ifndef OPENSSL_NO_RSA
1926                         if (pkey->type == EVP_PKEY_RSA
1927                                         && TLS1_get_version(s) < TLS1_2_VERSION)
1928                                 {
1929                                 q=md_buf;
1930                                 j=0;
1931                                 for (num=2; num > 0; num--)
1932                                         {
1933                                         EVP_MD_CTX_set_flags(&md_ctx,
1934                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1935                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1936                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1937                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1938                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1939                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1940                                         EVP_DigestFinal_ex(&md_ctx,q,
1941                                                 (unsigned int *)&i);
1942                                         q+=i;
1943                                         j+=i;
1944                                         }
1945                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1946                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1947                                         {
1948                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1949                                         goto err;
1950                                         }
1951                                 s2n(u,p);
1952                                 n+=u+2;
1953                                 }
1954                         else
1955 #endif
1956                         if (md)
1957                                 {
1958                                 /* For TLS1.2 and later send signature
1959                                  * algorithm */
1960                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1961                                         {
1962                                         if (!tls12_get_sigandhash(p, pkey, md))
1963                                                 {
1964                                                 /* Should never happen */
1965                                                 al=SSL_AD_INTERNAL_ERROR;
1966                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1967                                                 goto f_err;
1968                                                 }
1969                                         p+=2;
1970                                         }
1971 #ifdef SSL_DEBUG
1972                                 fprintf(stderr, "Using hash %s\n",
1973                                                         EVP_MD_name(md));
1974 #endif
1975                                 EVP_SignInit_ex(&md_ctx, md, NULL);
1976                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1977                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1978                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1979                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1980                                         (unsigned int *)&i,pkey))
1981                                         {
1982                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
1983                                         goto err;
1984                                         }
1985                                 s2n(i,p);
1986                                 n+=i+2;
1987                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1988                                         n+= 2;
1989                                 }
1990                         else
1991                                 {
1992                                 /* Is this error check actually needed? */
1993                                 al=SSL_AD_HANDSHAKE_FAILURE;
1994                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1995                                 goto f_err;
1996                                 }
1997                         }
1998
1999                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
2000                 l2n3(n,d);
2001
2002                 /* we should now have things packed up, so lets send
2003                  * it off */
2004                 s->init_num=n+4;
2005                 s->init_off=0;
2006                 }
2007
2008         s->state = SSL3_ST_SW_KEY_EXCH_B;
2009         EVP_MD_CTX_cleanup(&md_ctx);
2010         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2011 f_err:
2012         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2013 err:
2014 #ifndef OPENSSL_NO_ECDH
2015         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2016         BN_CTX_free(bn_ctx);
2017 #endif
2018         EVP_MD_CTX_cleanup(&md_ctx);
2019         return(-1);
2020         }
2021
2022 int ssl3_send_certificate_request(SSL *s)
2023         {
2024         unsigned char *p,*d;
2025         int i,j,nl,off,n;
2026         STACK_OF(X509_NAME) *sk=NULL;
2027         X509_NAME *name;
2028         BUF_MEM *buf;
2029
2030         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2031                 {
2032                 buf=s->init_buf;
2033
2034                 d=p=(unsigned char *)&(buf->data[4]);
2035
2036                 /* get the list of acceptable cert types */
2037                 p++;
2038                 n=ssl3_get_req_cert_type(s,p);
2039                 d[0]=n;
2040                 p+=n;
2041                 n++;
2042
2043                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2044                         {
2045                         nl = tls12_get_req_sig_algs(s, p + 2);
2046                         s2n(nl, p);
2047                         p += nl + 2;
2048                         n += nl + 2;
2049                         }
2050
2051                 off=n;
2052                 p+=2;
2053                 n+=2;
2054
2055                 sk=SSL_get_client_CA_list(s);
2056                 nl=0;
2057                 if (sk != NULL)
2058                         {
2059                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2060                                 {
2061                                 name=sk_X509_NAME_value(sk,i);
2062                                 j=i2d_X509_NAME(name,NULL);
2063                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2064                                         {
2065                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2066                                         goto err;
2067                                         }
2068                                 p=(unsigned char *)&(buf->data[4+n]);
2069                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2070                                         {
2071                                         s2n(j,p);
2072                                         i2d_X509_NAME(name,&p);
2073                                         n+=2+j;
2074                                         nl+=2+j;
2075                                         }
2076                                 else
2077                                         {
2078                                         d=p;
2079                                         i2d_X509_NAME(name,&p);
2080                                         j-=2; s2n(j,d); j+=2;
2081                                         n+=j;
2082                                         nl+=j;
2083                                         }
2084                                 }
2085                         }
2086                 /* else no CA names */
2087                 p=(unsigned char *)&(buf->data[4+off]);
2088                 s2n(nl,p);
2089
2090                 d=(unsigned char *)buf->data;
2091                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
2092                 l2n3(n,d);
2093
2094                 /* we should now have things packed up, so lets send
2095                  * it off */
2096
2097                 s->init_num=n+4;
2098                 s->init_off=0;
2099 #ifdef NETSCAPE_HANG_BUG
2100                 p=(unsigned char *)s->init_buf->data + s->init_num;
2101
2102                 /* do the header */
2103                 *(p++)=SSL3_MT_SERVER_DONE;
2104                 *(p++)=0;
2105                 *(p++)=0;
2106                 *(p++)=0;
2107                 s->init_num += 4;
2108 #endif
2109
2110                 s->state = SSL3_ST_SW_CERT_REQ_B;
2111                 }
2112
2113         /* SSL3_ST_SW_CERT_REQ_B */
2114         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2115 err:
2116         return(-1);
2117         }
2118
2119 int ssl3_get_client_key_exchange(SSL *s)
2120         {
2121         int i,al,ok;
2122         long n;
2123         unsigned long alg_k;
2124         unsigned char *p;
2125 #ifndef OPENSSL_NO_RSA
2126         RSA *rsa=NULL;
2127         EVP_PKEY *pkey=NULL;
2128 #endif
2129 #ifndef OPENSSL_NO_DH
2130         BIGNUM *pub=NULL;
2131         DH *dh_srvr;
2132 #endif
2133 #ifndef OPENSSL_NO_KRB5
2134         KSSL_ERR kssl_err;
2135 #endif /* OPENSSL_NO_KRB5 */
2136
2137 #ifndef OPENSSL_NO_ECDH
2138         EC_KEY *srvr_ecdh = NULL;
2139         EVP_PKEY *clnt_pub_pkey = NULL;
2140         EC_POINT *clnt_ecpoint = NULL;
2141         BN_CTX *bn_ctx = NULL;
2142 #endif
2143
2144         n=s->method->ssl_get_message(s,
2145                 SSL3_ST_SR_KEY_EXCH_A,
2146                 SSL3_ST_SR_KEY_EXCH_B,
2147                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2148                 2048, /* ??? */
2149                 &ok);
2150
2151         if (!ok) return((int)n);
2152         p=(unsigned char *)s->init_msg;
2153
2154         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2155
2156 #ifndef OPENSSL_NO_RSA
2157         if (alg_k & SSL_kRSA)
2158                 {
2159                 /* FIX THIS UP EAY EAY EAY EAY */
2160                 if (s->s3->tmp.use_rsa_tmp)
2161                         {
2162                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2163                                 rsa=s->cert->rsa_tmp;
2164                         /* Don't do a callback because rsa_tmp should
2165                          * be sent already */
2166                         if (rsa == NULL)
2167                                 {
2168                                 al=SSL_AD_HANDSHAKE_FAILURE;
2169                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2170                                 goto f_err;
2171
2172                                 }
2173                         }
2174                 else
2175                         {
2176                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2177                         if (    (pkey == NULL) ||
2178                                 (pkey->type != EVP_PKEY_RSA) ||
2179                                 (pkey->pkey.rsa == NULL))
2180                                 {
2181                                 al=SSL_AD_HANDSHAKE_FAILURE;
2182                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2183                                 goto f_err;
2184                                 }
2185                         rsa=pkey->pkey.rsa;
2186                         }
2187
2188                 /* TLS and [incidentally] DTLS{0xFEFF} */
2189                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2190                         {
2191                         n2s(p,i);
2192                         if (n != i+2)
2193                                 {
2194                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2195                                         {
2196                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2197                                         goto err;
2198                                         }
2199                                 else
2200                                         p-=2;
2201                                 }
2202                         else
2203                                 n=i;
2204                         }
2205
2206                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2207
2208                 al = -1;
2209
2210                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2211                         {
2212                         al=SSL_AD_DECODE_ERROR;
2213                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2214                         }
2215
2216                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2217                         {
2218                         /* The premaster secret must contain the same version number as the
2219                          * ClientHello to detect version rollback attacks (strangely, the
2220                          * protocol does not offer such protection for DH ciphersuites).
2221                          * However, buggy clients exist that send the negotiated protocol
2222                          * version instead if the server does not support the requested
2223                          * protocol version.
2224                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2225                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2226                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2227                                 {
2228                                 al=SSL_AD_DECODE_ERROR;
2229                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2230
2231                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2232                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2233                                  * number check as a "bad version oracle" -- an alert would
2234                                  * reveal that the plaintext corresponding to some ciphertext
2235                                  * made up by the adversary is properly formatted except
2236                                  * that the version number is wrong.  To avoid such attacks,
2237                                  * we should treat this just like any other decryption error. */
2238                                 }
2239                         }
2240
2241                 if (al != -1)
2242                         {
2243                         /* Some decryption failure -- use random value instead as countermeasure
2244                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2245                          * (see RFC 2246, section 7.4.7.1). */
2246                         ERR_clear_error();
2247                         i = SSL_MAX_MASTER_KEY_LENGTH;
2248                         p[0] = s->client_version >> 8;
2249                         p[1] = s->client_version & 0xff;
2250                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2251                                 goto err;
2252                         }
2253
2254                 s->session->master_key_length=
2255                         s->method->ssl3_enc->generate_master_secret(s,
2256                                 s->session->master_key,
2257                                 p,i);
2258                 OPENSSL_cleanse(p,i);
2259                 }
2260         else
2261 #endif
2262 #ifndef OPENSSL_NO_DH
2263                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2264                 {
2265                 n2s(p,i);
2266                 if (n != i+2)
2267                         {
2268                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2269                                 {
2270                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2271                                 goto err;
2272                                 }
2273                         else
2274                                 {
2275                                 p-=2;
2276                                 i=(int)n;
2277                                 }
2278                         }
2279
2280                 if (n == 0L) /* the parameters are in the cert */
2281                         {
2282                         al=SSL_AD_HANDSHAKE_FAILURE;
2283                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
2284                         goto f_err;
2285                         }
2286                 else
2287                         {
2288                         if (s->s3->tmp.dh == NULL)
2289                                 {
2290                                 al=SSL_AD_HANDSHAKE_FAILURE;
2291                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2292                                 goto f_err;
2293                                 }
2294                         else
2295                                 dh_srvr=s->s3->tmp.dh;
2296                         }
2297
2298                 pub=BN_bin2bn(p,i,NULL);
2299                 if (pub == NULL)
2300                         {
2301                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2302                         goto err;
2303                         }
2304
2305                 i=DH_compute_key(p,pub,dh_srvr);
2306
2307                 if (i <= 0)
2308                         {
2309                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2310                         BN_clear_free(pub);
2311                         goto err;
2312                         }
2313
2314                 DH_free(s->s3->tmp.dh);
2315                 s->s3->tmp.dh=NULL;
2316
2317                 BN_clear_free(pub);
2318                 pub=NULL;
2319                 s->session->master_key_length=
2320                         s->method->ssl3_enc->generate_master_secret(s,
2321                                 s->session->master_key,p,i);
2322                 OPENSSL_cleanse(p,i);
2323                 }
2324         else
2325 #endif
2326 #ifndef OPENSSL_NO_KRB5
2327         if (alg_k & SSL_kKRB5)
2328                 {
2329                 krb5_error_code         krb5rc;
2330                 krb5_data               enc_ticket;
2331                 krb5_data               authenticator;
2332                 krb5_data               enc_pms;
2333                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2334                 EVP_CIPHER_CTX          ciph_ctx;
2335                 const EVP_CIPHER        *enc = NULL;
2336                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2337                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2338                                                + EVP_MAX_BLOCK_LENGTH];
2339                 int                  padl, outl;
2340                 krb5_timestamp          authtime = 0;
2341                 krb5_ticket_times       ttimes;
2342
2343                 EVP_CIPHER_CTX_init(&ciph_ctx);
2344
2345                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2346
2347                 n2s(p,i);
2348                 enc_ticket.length = i;
2349
2350                 if (n < (long)(enc_ticket.length + 6))
2351                         {
2352                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2353                                 SSL_R_DATA_LENGTH_TOO_LONG);
2354                         goto err;
2355                         }
2356
2357                 enc_ticket.data = (char *)p;
2358                 p+=enc_ticket.length;
2359
2360                 n2s(p,i);
2361                 authenticator.length = i;
2362
2363                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2364                         {
2365                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2366                                 SSL_R_DATA_LENGTH_TOO_LONG);
2367                         goto err;
2368                         }
2369
2370                 authenticator.data = (char *)p;
2371                 p+=authenticator.length;
2372
2373                 n2s(p,i);
2374                 enc_pms.length = i;
2375                 enc_pms.data = (char *)p;
2376                 p+=enc_pms.length;
2377
2378                 /* Note that the length is checked again below,
2379                 ** after decryption
2380                 */
2381                 if(enc_pms.length > sizeof pms)
2382                         {
2383                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2384                                SSL_R_DATA_LENGTH_TOO_LONG);
2385                         goto err;
2386                         }
2387
2388                 if (n != (long)(enc_ticket.length + authenticator.length +
2389                                                 enc_pms.length + 6))
2390                         {
2391                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2392                                 SSL_R_DATA_LENGTH_TOO_LONG);
2393                         goto err;
2394                         }
2395
2396                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2397                                         &kssl_err)) != 0)
2398                         {
2399 #ifdef KSSL_DEBUG
2400                         printf("kssl_sget_tkt rtn %d [%d]\n",
2401                                 krb5rc, kssl_err.reason);
2402                         if (kssl_err.text)
2403                                 printf("kssl_err text= %s\n", kssl_err.text);
2404 #endif  /* KSSL_DEBUG */
2405                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2406                                 kssl_err.reason);
2407                         goto err;
2408                         }
2409
2410                 /*  Note: no authenticator is not considered an error,
2411                 **  but will return authtime == 0.
2412                 */
2413                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2414                                         &authtime, &kssl_err)) != 0)
2415                         {
2416 #ifdef KSSL_DEBUG
2417                         printf("kssl_check_authent rtn %d [%d]\n",
2418                                 krb5rc, kssl_err.reason);
2419                         if (kssl_err.text)
2420                                 printf("kssl_err text= %s\n", kssl_err.text);
2421 #endif  /* KSSL_DEBUG */
2422                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2423                                 kssl_err.reason);
2424                         goto err;
2425                         }
2426
2427                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2428                         {
2429                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2430                         goto err;
2431                         }
2432
2433 #ifdef KSSL_DEBUG
2434                 kssl_ctx_show(kssl_ctx);
2435 #endif  /* KSSL_DEBUG */
2436
2437                 enc = kssl_map_enc(kssl_ctx->enctype);
2438                 if (enc == NULL)
2439                     goto err;
2440
2441                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2442
2443                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2444                         {
2445                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2446                                 SSL_R_DECRYPTION_FAILED);
2447                         goto err;
2448                         }
2449                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2450                                         (unsigned char *)enc_pms.data, enc_pms.length))
2451                         {
2452                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2453                                 SSL_R_DECRYPTION_FAILED);
2454                         goto err;
2455                         }
2456                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2457                         {
2458                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2459                                 SSL_R_DATA_LENGTH_TOO_LONG);
2460                         goto err;
2461                         }
2462                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2463                         {
2464                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2465                                 SSL_R_DECRYPTION_FAILED);
2466                         goto err;
2467                         }
2468                 outl += padl;
2469                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2470                         {
2471                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2472                                 SSL_R_DATA_LENGTH_TOO_LONG);
2473                         goto err;
2474                         }
2475                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2476                     {
2477                     /* The premaster secret must contain the same version number as the
2478                      * ClientHello to detect version rollback attacks (strangely, the
2479                      * protocol does not offer such protection for DH ciphersuites).
2480                      * However, buggy clients exist that send random bytes instead of
2481                      * the protocol version.
2482                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2483                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2484                      */
2485                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2486                         {
2487                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2488                                SSL_AD_DECODE_ERROR);
2489                         goto err;
2490                         }
2491                     }
2492
2493                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2494
2495                 s->session->master_key_length=
2496                         s->method->ssl3_enc->generate_master_secret(s,
2497                                 s->session->master_key, pms, outl);
2498
2499                 if (kssl_ctx->client_princ)
2500                         {
2501                         size_t len = strlen(kssl_ctx->client_princ);
2502                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2503                                 {
2504                                 s->session->krb5_client_princ_len = len;
2505                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2506                                 }
2507                         }
2508
2509
2510                 /*  Was doing kssl_ctx_free() here,
2511                 **  but it caused problems for apache.
2512                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2513                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2514                 */
2515                 }
2516         else
2517 #endif  /* OPENSSL_NO_KRB5 */
2518
2519 #ifndef OPENSSL_NO_ECDH
2520                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2521                 {
2522                 int ret = 1;
2523                 int field_size = 0;
2524                 const EC_KEY   *tkey;
2525                 const EC_GROUP *group;
2526                 const BIGNUM *priv_key;
2527
2528                 /* initialize structures for server's ECDH key pair */
2529                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2530                         {
2531                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2532                             ERR_R_MALLOC_FAILURE);
2533                         goto err;
2534                         }
2535
2536                 /* Let's get server private key and group information */
2537                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2538                         {
2539                         /* use the certificate */
2540                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2541                         }
2542                 else
2543                         {
2544                         /* use the ephermeral values we saved when
2545                          * generating the ServerKeyExchange msg.
2546                          */
2547                         tkey = s->s3->tmp.ecdh;
2548                         }
2549
2550                 group    = EC_KEY_get0_group(tkey);
2551                 priv_key = EC_KEY_get0_private_key(tkey);
2552
2553                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2554                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2555                         {
2556                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2557                                ERR_R_EC_LIB);
2558                         goto err;
2559                         }
2560
2561                 /* Let's get client's public key */
2562                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2563                         {
2564                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2565                             ERR_R_MALLOC_FAILURE);
2566                         goto err;
2567                         }
2568
2569                 if (n == 0L)
2570                         {
2571                         /* Client Publickey was in Client Certificate */
2572
2573                          if (alg_k & SSL_kEECDH)
2574                                  {
2575                                  al=SSL_AD_HANDSHAKE_FAILURE;
2576                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2577                                  goto f_err;
2578                                  }
2579                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2580                             == NULL) ||
2581                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2582                                 {
2583                                 /* XXX: For now, we do not support client
2584                                  * authentication using ECDH certificates
2585                                  * so this branch (n == 0L) of the code is
2586                                  * never executed. When that support is
2587                                  * added, we ought to ensure the key
2588                                  * received in the certificate is
2589                                  * authorized for key agreement.
2590                                  * ECDH_compute_key implicitly checks that
2591                                  * the two ECDH shares are for the same
2592                                  * group.
2593                                  */
2594                                 al=SSL_AD_HANDSHAKE_FAILURE;
2595                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2596                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2597                                 goto f_err;
2598                                 }
2599
2600                         if (EC_POINT_copy(clnt_ecpoint,
2601                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2602                                 {
2603                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2604                                         ERR_R_EC_LIB);
2605                                 goto err;
2606                                 }
2607                         ret = 2; /* Skip certificate verify processing */
2608                         }
2609                 else
2610                         {
2611                         /* Get client's public key from encoded point
2612                          * in the ClientKeyExchange message.
2613                          */
2614                         if ((bn_ctx = BN_CTX_new()) == NULL)
2615                                 {
2616                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2617                                     ERR_R_MALLOC_FAILURE);
2618                                 goto err;
2619                                 }
2620
2621                         /* Get encoded point length */
2622                         i = *p;
2623                         p += 1;
2624                         if (n != 1 + i)
2625                                 {
2626                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2627                                     ERR_R_EC_LIB);
2628                                 goto err;
2629                                 }
2630                         if (EC_POINT_oct2point(group,
2631                             clnt_ecpoint, p, i, bn_ctx) == 0)
2632                                 {
2633                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2634                                     ERR_R_EC_LIB);
2635                                 goto err;
2636                                 }
2637                         /* p is pointing to somewhere in the buffer
2638                          * currently, so set it to the start
2639                          */
2640                         p=(unsigned char *)s->init_buf->data;
2641                         }
2642
2643                 /* Compute the shared pre-master secret */
2644                 field_size = EC_GROUP_get_degree(group);
2645                 if (field_size <= 0)
2646                         {
2647                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2648                                ERR_R_ECDH_LIB);
2649                         goto err;
2650                         }
2651                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2652                 if (i <= 0)
2653                         {
2654                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2655                             ERR_R_ECDH_LIB);
2656                         goto err;
2657                         }
2658
2659                 EVP_PKEY_free(clnt_pub_pkey);
2660                 EC_POINT_free(clnt_ecpoint);
2661                 EC_KEY_free(srvr_ecdh);
2662                 BN_CTX_free(bn_ctx);
2663                 EC_KEY_free(s->s3->tmp.ecdh);
2664                 s->s3->tmp.ecdh = NULL;
2665
2666                 /* Compute the master secret */
2667                 s->session->master_key_length = s->method->ssl3_enc-> \
2668                     generate_master_secret(s, s->session->master_key, p, i);
2669
2670                 OPENSSL_cleanse(p, i);
2671                 return (ret);
2672                 }
2673         else
2674 #endif
2675 #ifndef OPENSSL_NO_PSK
2676                 if (alg_k & SSL_kPSK)
2677                         {
2678                         unsigned char *t = NULL;
2679                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2680                         unsigned int pre_ms_len = 0, psk_len = 0;
2681                         int psk_err = 1;
2682                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2683
2684                         al=SSL_AD_HANDSHAKE_FAILURE;
2685
2686                         n2s(p,i);
2687                         if (n != i+2)
2688                                 {
2689                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2690                                         SSL_R_LENGTH_MISMATCH);
2691                                 goto psk_err;
2692                                 }
2693                         if (i > PSK_MAX_IDENTITY_LEN)
2694                                 {
2695                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2696                                         SSL_R_DATA_LENGTH_TOO_LONG);
2697                                 goto psk_err;
2698                                 }
2699                         if (s->psk_server_callback == NULL)
2700                                 {
2701                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2702                                        SSL_R_PSK_NO_SERVER_CB);
2703                                 goto psk_err;
2704                                 }
2705
2706                         /* Create guaranteed NULL-terminated identity
2707                          * string for the callback */
2708                         memcpy(tmp_id, p, i);
2709                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2710                         psk_len = s->psk_server_callback(s, tmp_id,
2711                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2712                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2713
2714                         if (psk_len > PSK_MAX_PSK_LEN)
2715                                 {
2716                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2717                                         ERR_R_INTERNAL_ERROR);
2718                                 goto psk_err;
2719                                 }
2720                         else if (psk_len == 0)
2721                                 {
2722                                 /* PSK related to the given identity not found */
2723                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2724                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2725                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2726                                 goto psk_err;
2727                                 }
2728
2729                         /* create PSK pre_master_secret */
2730                         pre_ms_len=2+psk_len+2+psk_len;
2731                         t = psk_or_pre_ms;
2732                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2733                         s2n(psk_len, t);
2734                         memset(t, 0, psk_len);
2735                         t+=psk_len;
2736                         s2n(psk_len, t);
2737
2738                         if (s->session->psk_identity != NULL)
2739                                 OPENSSL_free(s->session->psk_identity);
2740                         s->session->psk_identity = BUF_strdup((char *)p);
2741                         if (s->session->psk_identity == NULL)
2742                                 {
2743                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2744                                         ERR_R_MALLOC_FAILURE);
2745                                 goto psk_err;
2746                                 }
2747
2748                         if (s->session->psk_identity_hint != NULL)
2749                                 OPENSSL_free(s->session->psk_identity_hint);
2750                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2751                         if (s->ctx->psk_identity_hint != NULL &&
2752                                 s->session->psk_identity_hint == NULL)
2753                                 {
2754                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2755                                         ERR_R_MALLOC_FAILURE);
2756                                 goto psk_err;
2757                                 }
2758
2759                         s->session->master_key_length=
2760                                 s->method->ssl3_enc->generate_master_secret(s,
2761                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2762                         psk_err = 0;
2763                 psk_err:
2764                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2765                         if (psk_err != 0)
2766                                 goto f_err;
2767                         }
2768                 else
2769 #endif
2770 #ifndef OPENSSL_NO_SRP
2771                 if (alg_k & SSL_kSRP)
2772                         {
2773                         int param_len;
2774
2775                         n2s(p,i);
2776                         param_len=i+2;
2777                         if (param_len > n)
2778                                 {
2779                                 al=SSL_AD_DECODE_ERROR;
2780                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2781                                 goto f_err;
2782                                 }
2783                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2784                                 {
2785                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2786                                 goto err;
2787                                 }
2788                         if (s->session->srp_username != NULL)
2789                                 OPENSSL_free(s->session->srp_username);
2790                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2791                         if (s->session->srp_username == NULL)
2792                                 {
2793                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2794                                         ERR_R_MALLOC_FAILURE);
2795                                 goto err;
2796                                 }
2797
2798                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2799                                 {
2800                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2801                                 goto err;
2802                                 }
2803
2804                         p+=i;
2805                         }
2806                 else
2807 #endif  /* OPENSSL_NO_SRP */
2808                 if (alg_k & SSL_kGOST)
2809                         {
2810                         int ret = 0;
2811                         EVP_PKEY_CTX *pkey_ctx;
2812                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2813                         unsigned char premaster_secret[32], *start;
2814                         size_t outlen=32, inlen;
2815                         unsigned long alg_a;
2816
2817                         /* Get our certificate private key*/
2818                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2819                         if (alg_a & SSL_aGOST94)
2820                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2821                         else if (alg_a & SSL_aGOST01)
2822                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2823
2824                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2825                         EVP_PKEY_decrypt_init(pkey_ctx);
2826                         /* If client certificate is present and is of the same type, maybe
2827                          * use it for key exchange.  Don't mind errors from
2828                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2829                          * a client certificate for authorization only. */
2830                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2831                         if (client_pub_pkey)
2832                                 {
2833                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2834                                         ERR_clear_error();
2835                                 }
2836                         /* Decrypt session key */
2837                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED)))
2838                                 {
2839                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2840                                 goto gerr;
2841                                 }
2842                         if (p[1] == 0x81)
2843                                 {
2844                                 start = p+3;
2845                                 inlen = p[2];
2846                                 }
2847                         else if (p[1] < 0x80)
2848                                 {
2849                                 start = p+2;
2850                                 inlen = p[1];
2851                                 }
2852                         else
2853                                 {
2854                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2855                                 goto gerr;
2856                                 }
2857                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
2858
2859                                 {
2860                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2861                                 goto gerr;
2862                                 }
2863                         /* Generate master secret */
2864                         s->session->master_key_length=
2865                                 s->method->ssl3_enc->generate_master_secret(s,
2866                                         s->session->master_key,premaster_secret,32);
2867                         /* Check if pubkey from client certificate was used */
2868                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2869                                 ret = 2;
2870                         else
2871                                 ret = 1;
2872                 gerr:
2873                         EVP_PKEY_free(client_pub_pkey);
2874                         EVP_PKEY_CTX_free(pkey_ctx);
2875                         if (ret)
2876                                 return ret;
2877                         else
2878                                 goto err;
2879                         }
2880                 else
2881                 {
2882                 al=SSL_AD_HANDSHAKE_FAILURE;
2883                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2884                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2885                 goto f_err;
2886                 }
2887
2888         return(1);
2889 f_err:
2890         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2891 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
2892 err:
2893 #endif
2894 #ifndef OPENSSL_NO_ECDH
2895         EVP_PKEY_free(clnt_pub_pkey);
2896         EC_POINT_free(clnt_ecpoint);
2897         if (srvr_ecdh != NULL)
2898                 EC_KEY_free(srvr_ecdh);
2899         BN_CTX_free(bn_ctx);
2900 #endif
2901         return(-1);
2902         }
2903
2904 int ssl3_get_cert_verify(SSL *s)
2905         {
2906         EVP_PKEY *pkey=NULL;
2907         unsigned char *p;
2908         int al,ok,ret=0;
2909         long n;
2910         int type=0,i,j;
2911         X509 *peer;
2912         const EVP_MD *md = NULL;
2913         EVP_MD_CTX mctx;
2914         EVP_MD_CTX_init(&mctx);
2915
2916         n=s->method->ssl_get_message(s,
2917                 SSL3_ST_SR_CERT_VRFY_A,
2918                 SSL3_ST_SR_CERT_VRFY_B,
2919                 -1,
2920                 516, /* Enough for 4096 bit RSA key with TLS v1.2 */
2921                 &ok);
2922
2923         if (!ok) return((int)n);
2924
2925         if (s->session->peer != NULL)
2926                 {
2927                 peer=s->session->peer;
2928                 pkey=X509_get_pubkey(peer);
2929                 type=X509_certificate_type(peer,pkey);
2930                 }
2931         else
2932                 {
2933                 peer=NULL;
2934                 pkey=NULL;
2935                 }
2936
2937         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2938                 {
2939                 s->s3->tmp.reuse_message=1;
2940                 if ((peer != NULL) && (type & EVP_PKT_SIGN))
2941                         {
2942                         al=SSL_AD_UNEXPECTED_MESSAGE;
2943                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2944                         goto f_err;
2945                         }
2946                 ret=1;
2947                 goto end;
2948                 }
2949
2950         if (peer == NULL)
2951                 {
2952                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2953                 al=SSL_AD_UNEXPECTED_MESSAGE;
2954                 goto f_err;
2955                 }
2956
2957         if (!(type & EVP_PKT_SIGN))
2958                 {
2959                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2960                 al=SSL_AD_ILLEGAL_PARAMETER;
2961                 goto f_err;
2962                 }
2963
2964         if (s->s3->change_cipher_spec)
2965                 {
2966                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2967                 al=SSL_AD_UNEXPECTED_MESSAGE;
2968                 goto f_err;
2969                 }
2970
2971         /* we now have a signature that we need to verify */
2972         p=(unsigned char *)s->init_msg;
2973         /* Check for broken implementations of GOST ciphersuites */
2974         /* If key is GOST and n is exactly 64, it is bare
2975          * signature without length field */
2976         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
2977                 pkey->type == NID_id_GostR3410_2001) )
2978                 {
2979                 i=64;
2980                 }
2981         else
2982                 {
2983                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2984                         {
2985                         int sigalg = tls12_get_sigid(pkey);
2986                         /* Should never happen */
2987                         if (sigalg == -1)
2988                                 {
2989                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2990                                 al=SSL_AD_INTERNAL_ERROR;
2991                                 goto f_err;
2992                                 }
2993                         /* Check key type is consistent with signature */
2994                         if (sigalg != (int)p[1])
2995                                 {
2996                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_TYPE);
2997                                 al=SSL_AD_DECODE_ERROR;
2998                                 goto f_err;
2999                                 }
3000                         md = tls12_get_hash(p[0]);
3001                         if (md == NULL)
3002                                 {
3003                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_UNKNOWN_DIGEST);
3004                                 al=SSL_AD_DECODE_ERROR;
3005                                 goto f_err;
3006                                 }
3007 #ifdef SSL_DEBUG
3008 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3009 #endif
3010                         p += 2;
3011                         n -= 2;
3012                         }
3013                 n2s(p,i);
3014                 n-=2;
3015                 if (i > n)
3016                         {
3017                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3018                         al=SSL_AD_DECODE_ERROR;
3019                         goto f_err;
3020                         }
3021         }
3022         j=EVP_PKEY_size(pkey);
3023         if ((i > j) || (n > j) || (n <= 0))
3024                 {
3025                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3026                 al=SSL_AD_DECODE_ERROR;
3027                 goto f_err;
3028                 }
3029
3030         if (TLS1_get_version(s) >= TLS1_2_VERSION)
3031                 {
3032                 long hdatalen = 0;
3033                 void *hdata;
3034                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3035                 if (hdatalen <= 0)
3036                         {
3037                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3038                         al=SSL_AD_INTERNAL_ERROR;
3039                         goto f_err;
3040                         }
3041 #ifdef SSL_DEBUG
3042                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3043                                                         EVP_MD_name(md));
3044 #endif
3045                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3046                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3047                         {
3048                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3049                         al=SSL_AD_INTERNAL_ERROR;
3050                         goto f_err;
3051                         }
3052
3053                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3054                         {
3055                         al=SSL_AD_DECRYPT_ERROR;
3056                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3057                         goto f_err;
3058                         }
3059                 }
3060         else
3061 #ifndef OPENSSL_NO_RSA
3062         if (pkey->type == EVP_PKEY_RSA)
3063                 {
3064                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3065                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
3066                                                         pkey->pkey.rsa);
3067                 if (i < 0)
3068                         {
3069                         al=SSL_AD_DECRYPT_ERROR;
3070                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3071                         goto f_err;
3072                         }
3073                 if (i == 0)
3074                         {
3075                         al=SSL_AD_DECRYPT_ERROR;
3076                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3077                         goto f_err;
3078                         }
3079                 }
3080         else
3081 #endif
3082 #ifndef OPENSSL_NO_DSA
3083                 if (pkey->type == EVP_PKEY_DSA)
3084                 {
3085                 j=DSA_verify(pkey->save_type,
3086                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3087                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3088                 if (j <= 0)
3089                         {
3090                         /* bad signature */
3091                         al=SSL_AD_DECRYPT_ERROR;
3092                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3093                         goto f_err;
3094                         }
3095                 }
3096         else
3097 #endif
3098 #ifndef OPENSSL_NO_ECDSA
3099                 if (pkey->type == EVP_PKEY_EC)
3100                 {
3101                 j=ECDSA_verify(pkey->save_type,
3102                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3103                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3104                 if (j <= 0)
3105                         {
3106                         /* bad signature */
3107                         al=SSL_AD_DECRYPT_ERROR;
3108                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3109                             SSL_R_BAD_ECDSA_SIGNATURE);
3110                         goto f_err;
3111                         }
3112                 }
3113         else
3114 #endif
3115         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3116                 {   unsigned char signature[64];
3117                         int idx;
3118                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3119                         EVP_PKEY_verify_init(pctx);
3120                         if (i!=64) {
3121                                 fprintf(stderr,"GOST signature length is %d",i);
3122                         }
3123                         for (idx=0;idx<64;idx++) {
3124                                 signature[63-idx]=p[idx];
3125                         }
3126                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3127                         EVP_PKEY_CTX_free(pctx);
3128                         if (j<=0)
3129                                 {
3130                                 al=SSL_AD_DECRYPT_ERROR;
3131                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3132                                         SSL_R_BAD_ECDSA_SIGNATURE);
3133                                 goto f_err;
3134                                 }
3135                 }
3136         else
3137                 {
3138                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3139                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3140                 goto f_err;
3141                 }
3142
3143
3144         ret=1;
3145         if (0)
3146                 {
3147 f_err:
3148                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3149                 }
3150 end:
3151         if (s->s3->handshake_buffer)
3152                 {
3153                 BIO_free(s->s3->handshake_buffer);
3154                 s->s3->handshake_buffer = NULL;
3155                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3156                 }
3157         EVP_MD_CTX_cleanup(&mctx);
3158         EVP_PKEY_free(pkey);
3159         return(ret);
3160         }
3161
3162 int ssl3_get_client_certificate(SSL *s)
3163         {
3164         int i,ok,al,ret= -1;
3165         X509 *x=NULL;
3166         unsigned long l,nc,llen,n;
3167         const unsigned char *p,*q;
3168         unsigned char *d;
3169         STACK_OF(X509) *sk=NULL;
3170
3171         n=s->method->ssl_get_message(s,
3172                 SSL3_ST_SR_CERT_A,
3173                 SSL3_ST_SR_CERT_B,
3174                 -1,
3175                 s->max_cert_list,
3176                 &ok);
3177
3178         if (!ok) return((int)n);
3179
3180         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3181                 {
3182                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3183                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3184                         {
3185                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3186                         al=SSL_AD_HANDSHAKE_FAILURE;
3187                         goto f_err;
3188                         }
3189                 /* If tls asked for a client cert, the client must return a 0 list */
3190                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3191                         {
3192                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3193                         al=SSL_AD_UNEXPECTED_MESSAGE;
3194                         goto f_err;
3195                         }
3196                 s->s3->tmp.reuse_message=1;
3197                 return(1);
3198                 }
3199
3200         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3201                 {
3202                 al=SSL_AD_UNEXPECTED_MESSAGE;
3203                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3204                 goto f_err;
3205                 }
3206         p=d=(unsigned char *)s->init_msg;
3207
3208         if ((sk=sk_X509_new_null()) == NULL)
3209                 {
3210                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3211                 goto err;
3212                 }
3213
3214         n2l3(p,llen);
3215         if (llen+3 != n)
3216                 {
3217                 al=SSL_AD_DECODE_ERROR;
3218                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3219                 goto f_err;
3220                 }
3221         for (nc=0; nc<llen; )
3222                 {
3223                 n2l3(p,l);
3224                 if ((l+nc+3) > llen)
3225                         {
3226                         al=SSL_AD_DECODE_ERROR;
3227                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3228                         goto f_err;
3229                         }
3230
3231                 q=p;
3232                 x=d2i_X509(NULL,&p,l);
3233                 if (x == NULL)
3234                         {
3235                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3236                         goto err;
3237                         }
3238                 if (p != (q+l))
3239                         {
3240                         al=SSL_AD_DECODE_ERROR;
3241                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3242                         goto f_err;
3243                         }
3244                 if (!sk_X509_push(sk,x))
3245                         {
3246                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3247                         goto err;
3248                         }
3249                 x=NULL;
3250                 nc+=l+3;
3251                 }
3252
3253         if (sk_X509_num(sk) <= 0)
3254                 {
3255                 /* TLS does not mind 0 certs returned */
3256                 if (s->version == SSL3_VERSION)
3257                         {
3258                         al=SSL_AD_HANDSHAKE_FAILURE;
3259                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3260                         goto f_err;
3261                         }
3262                 /* Fail for TLS only if we required a certificate */
3263                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3264                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3265                         {
3266                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3267                         al=SSL_AD_HANDSHAKE_FAILURE;
3268                         goto f_err;
3269                         }
3270                 /* No client certificate so digest cached records */
3271                 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s))
3272                         {
3273                         al=SSL_AD_INTERNAL_ERROR;
3274                         goto f_err;
3275                         }
3276                 }
3277         else
3278                 {
3279                 i=ssl_verify_cert_chain(s,sk);
3280                 if (i <= 0)
3281                         {
3282                         al=ssl_verify_alarm_type(s->verify_result);
3283                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
3284                         goto f_err;
3285                         }
3286                 }
3287
3288         if (s->session->peer != NULL) /* This should not be needed */
3289                 X509_free(s->session->peer);
3290         s->session->peer=sk_X509_shift(sk);
3291         s->session->verify_result = s->verify_result;
3292
3293         /* With the current implementation, sess_cert will always be NULL
3294          * when we arrive here. */
3295         if (s->session->sess_cert == NULL)
3296                 {
3297                 s->session->sess_cert = ssl_sess_cert_new();
3298                 if (s->session->sess_cert == NULL)
3299                         {
3300                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3301                         goto err;
3302                         }
3303                 }
3304         if (s->session->sess_cert->cert_chain != NULL)
3305                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3306         s->session->sess_cert->cert_chain=sk;
3307         /* Inconsistency alert: cert_chain does *not* include the
3308          * peer's own certificate, while we do include it in s3_clnt.c */
3309
3310         sk=NULL;
3311
3312         ret=1;
3313         if (0)
3314                 {
3315 f_err:
3316                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3317                 }
3318 err:
3319         if (x != NULL) X509_free(x);
3320         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3321         return(ret);
3322         }
3323
3324 int ssl3_send_server_certificate(SSL *s)
3325         {
3326         unsigned long l;
3327         X509 *x;
3328
3329         if (s->state == SSL3_ST_SW_CERT_A)
3330                 {
3331                 x=ssl_get_server_send_cert(s);
3332                 if (x == NULL)
3333                         {
3334                         /* VRS: allow null cert if auth == KRB5 */
3335                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3336                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3337                                 {
3338                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3339                                 return(0);
3340                                 }
3341                         }
3342
3343                 l=ssl3_output_cert_chain(s,x);
3344                 s->state=SSL3_ST_SW_CERT_B;
3345                 s->init_num=(int)l;
3346                 s->init_off=0;
3347                 }
3348
3349         /* SSL3_ST_SW_CERT_B */
3350         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3351         }
3352
3353 #ifndef OPENSSL_NO_TLSEXT
3354 /* send a new session ticket (not necessarily for a new session) */
3355 int ssl3_send_newsession_ticket(SSL *s)
3356         {
3357         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3358                 {
3359                 unsigned char *p, *senc, *macstart;
3360                 const unsigned char *const_p;
3361                 int len, slen_full, slen;
3362                 SSL_SESSION *sess;
3363                 unsigned int hlen;
3364                 EVP_CIPHER_CTX ctx;
3365                 HMAC_CTX hctx;
3366                 SSL_CTX *tctx = s->initial_ctx;
3367                 unsigned char iv[EVP_MAX_IV_LENGTH];
3368                 unsigned char key_name[16];
3369
3370                 /* get session encoding length */
3371                 slen_full = i2d_SSL_SESSION(s->session, NULL);
3372                 /* Some length values are 16 bits, so forget it if session is
3373                  * too long
3374                  */
3375                 if (slen_full > 0xFF00)
3376                         return -1;
3377                 senc = OPENSSL_malloc(slen_full);
3378                 if (!senc)
3379                         return -1;
3380                 p = senc;
3381                 i2d_SSL_SESSION(s->session, &p);
3382
3383                 /* create a fresh copy (not shared with other threads) to clean up */
3384                 const_p = senc;
3385                 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3386                 if (sess == NULL)
3387                         {
3388                         OPENSSL_free(senc);
3389                         return -1;
3390                         }
3391                 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
3392
3393                 slen = i2d_SSL_SESSION(sess, NULL);
3394                 if (slen > slen_full) /* shouldn't ever happen */
3395                         {
3396                         OPENSSL_free(senc);
3397                         return -1;
3398                         }
3399                 p = senc;
3400                 i2d_SSL_SESSION(sess, &p);
3401                 SSL_SESSION_free(sess);
3402
3403                 /* Grow buffer if need be: the length calculation is as
3404                  * follows 1 (size of message name) + 3 (message length
3405                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
3406                  * 16 (key name) + max_iv_len (iv length) +
3407                  * session_length + max_enc_block_size (max encrypted session
3408                  * length) + max_md_size (HMAC).
3409                  */
3410                 if (!BUF_MEM_grow(s->init_buf,
3411                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
3412                         EVP_MAX_MD_SIZE + slen))
3413                         return -1;
3414
3415                 p=(unsigned char *)s->init_buf->data;
3416                 /* do the header */
3417                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
3418                 /* Skip message length for now */
3419                 p += 3;
3420                 EVP_CIPHER_CTX_init(&ctx);
3421                 HMAC_CTX_init(&hctx);
3422                 /* Initialize HMAC and cipher contexts. If callback present
3423                  * it does all the work otherwise use generated values
3424                  * from parent ctx.
3425                  */
3426                 if (tctx->tlsext_ticket_key_cb)
3427                         {
3428                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3429                                                          &hctx, 1) < 0)
3430                                 {
3431                                 OPENSSL_free(senc);
3432                                 return -1;
3433                                 }
3434                         }
3435                 else
3436                         {
3437                         RAND_pseudo_bytes(iv, 16);
3438                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3439                                         tctx->tlsext_tick_aes_key, iv);
3440                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3441                                         tlsext_tick_md(), NULL);
3442                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3443                         }
3444
3445                 /* Ticket lifetime hint (advisory only):
3446                  * We leave this unspecified for resumed session (for simplicity),
3447                  * and guess that tickets for new sessions will live as long
3448                  * as their sessions. */
3449                 l2n(s->hit ? 0 : s->session->timeout, p);
3450
3451                 /* Skip ticket length for now */
3452                 p += 2;
3453                 /* Output key name */
3454                 macstart = p;
3455                 memcpy(p, key_name, 16);
3456                 p += 16;
3457                 /* output IV */
3458                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3459                 p += EVP_CIPHER_CTX_iv_length(&ctx);
3460                 /* Encrypt session data */
3461                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3462                 p += len;
3463                 EVP_EncryptFinal(&ctx, p, &len);
3464                 p += len;
3465                 EVP_CIPHER_CTX_cleanup(&ctx);
3466
3467                 HMAC_Update(&hctx, macstart, p - macstart);
3468                 HMAC_Final(&hctx, p, &hlen);
3469                 HMAC_CTX_cleanup(&hctx);
3470
3471                 p += hlen;
3472                 /* Now write out lengths: p points to end of data written */
3473                 /* Total length */
3474                 len = p - (unsigned char *)s->init_buf->data;
3475                 p=(unsigned char *)s->init_buf->data + 1;
3476                 l2n3(len - 4, p); /* Message length */
3477                 p += 4;
3478                 s2n(len - 10, p);  /* Ticket length */
3479
3480                 /* number of bytes to write */
3481                 s->init_num= len;
3482                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3483                 s->init_off=0;
3484                 OPENSSL_free(senc);
3485                 }
3486
3487         /* SSL3_ST_SW_SESSION_TICKET_B */
3488         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3489         }
3490
3491 int ssl3_send_cert_status(SSL *s)
3492         {
3493         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3494                 {
3495                 unsigned char *p;
3496                 /* Grow buffer if need be: the length calculation is as
3497                  * follows 1 (message type) + 3 (message length) +
3498                  * 1 (ocsp response type) + 3 (ocsp response length)
3499                  * + (ocsp response)
3500                  */
3501                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3502                         return -1;
3503
3504                 p=(unsigned char *)s->init_buf->data;
3505
3506                 /* do the header */
3507                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3508                 /* message length */
3509                 l2n3(s->tlsext_ocsp_resplen + 4, p);
3510                 /* status type */
3511                 *(p++)= s->tlsext_status_type;
3512                 /* length of OCSP response */
3513                 l2n3(s->tlsext_ocsp_resplen, p);
3514                 /* actual response */
3515                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3516                 /* number of bytes to write */
3517                 s->init_num = 8 + s->tlsext_ocsp_resplen;
3518                 s->state=SSL3_ST_SW_CERT_STATUS_B;
3519                 s->init_off = 0;
3520                 }
3521
3522         /* SSL3_ST_SW_CERT_STATUS_B */
3523         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3524         }
3525
3526 # ifndef OPENSSL_NO_NEXTPROTONEG
3527 /* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It
3528  * sets the next_proto member in s if found */
3529 int ssl3_get_next_proto(SSL *s)
3530         {
3531         int ok;
3532         int proto_len, padding_len;
3533         long n;
3534         const unsigned char *p;
3535
3536         /* Clients cannot send a NextProtocol message if we didn't see the
3537          * extension in their ClientHello */
3538         if (!s->s3->next_proto_neg_seen)
3539                 {
3540                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION);
3541                 return -1;
3542                 }
3543
3544         n=s->method->ssl_get_message(s,
3545                 SSL3_ST_SR_NEXT_PROTO_A,
3546                 SSL3_ST_SR_NEXT_PROTO_B,
3547                 SSL3_MT_NEXT_PROTO,
3548                 514,  /* See the payload format below */
3549                 &ok);
3550
3551         if (!ok)
3552                 return((int)n);
3553
3554         /* s->state doesn't reflect whether ChangeCipherSpec has been received
3555          * in this handshake, but s->s3->change_cipher_spec does (will be reset
3556          * by ssl3_get_finished). */
3557         if (!s->s3->change_cipher_spec)
3558                 {
3559                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS);
3560                 return -1;
3561                 }
3562
3563         if (n < 2)
3564                 return 0;  /* The body must be > 1 bytes long */
3565
3566         p=(unsigned char *)s->init_msg;
3567
3568         /* The payload looks like:
3569          *   uint8 proto_len;
3570          *   uint8 proto[proto_len];
3571          *   uint8 padding_len;
3572          *   uint8 padding[padding_len];
3573          */
3574         proto_len = p[0];
3575         if (proto_len + 2 > s->init_num)
3576                 return 0;
3577         padding_len = p[proto_len + 1];
3578         if (proto_len + padding_len + 2 != s->init_num)
3579                 return 0;
3580
3581         s->next_proto_negotiated = OPENSSL_malloc(proto_len);
3582         if (!s->next_proto_negotiated)
3583                 {
3584                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,ERR_R_MALLOC_FAILURE);
3585                 return 0;
3586                 }
3587         memcpy(s->next_proto_negotiated, p + 1, proto_len);
3588         s->next_proto_negotiated_len = proto_len;
3589
3590         return 1;
3591         }
3592 # endif
3593 #endif