crypto/openssl/ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c */
   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) 1998-2005 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 #define REUSE_CIPHER_BUG
 126 #define NETSCAPE_HANG_BUG
 127
 128 #include <stdio.h>
 129 #include "ssl_locl.h"
 130 #include "kssl_lcl.h"
 131 #include <openssl/buffer.h>
 132 #include <openssl/rand.h>
 133 #include <openssl/objects.h>
 134 #include <openssl/evp.h>
 135 #include <openssl/hmac.h>
 136 #include <openssl/x509.h>
 137 #ifndef OPENSSL_NO_DH
 138 #include <openssl/dh.h>
 139 #endif
 140 #include <openssl/bn.h>
 141 #ifndef OPENSSL_NO_KRB5
 142 #include <openssl/krb5_asn.h>
 143 #endif
 144 #include <openssl/md5.h>
 145
 146 static SSL_METHOD *ssl3_get_server_method(int ver);
 147 #ifndef OPENSSL_NO_ECDH
 148 static int nid2curve_id(int nid);
 149 #endif
 150
 151 static SSL_METHOD *ssl3_get_server_method(int ver)
 152         {
 153         if (ver == SSL3_VERSION)
 154                 return(SSLv3_server_method());
 155         else
 156                 return(NULL);
 157         }
 158
 159 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
 160                         ssl3_accept,
 161                         ssl_undefined_function,
 162                         ssl3_get_server_method)
 163
 164 int ssl3_accept(SSL *s)
 165         {
 166         BUF_MEM *buf;
 167         unsigned long l,Time=(unsigned long)time(NULL);
 168         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 169         int ret= -1;
 170         int new_state,state,skip=0;
 171
 172         RAND_add(&Time,sizeof(Time),0);
 173         ERR_clear_error();
 174         clear_sys_error();
 175
 176         if (s->info_callback != NULL)
 177                 cb=s->info_callback;
 178         else if (s->ctx->info_callback != NULL)
 179                 cb=s->ctx->info_callback;
 180
 181         /* init things to blank */
 182         s->in_handshake++;
 183         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 184
 185         if (s->cert == NULL)
 186                 {
 187                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 188                 return(-1);
 189                 }
 190
 191         for (;;)
 192                 {
 193                 state=s->state;
 194
 195                 switch (s->state)
 196                         {
 197                 case SSL_ST_RENEGOTIATE:
 198                         s->new_session=1;
 199                         /* s->state=SSL_ST_ACCEPT; */
 200
 201                 case SSL_ST_BEFORE:
 202                 case SSL_ST_ACCEPT:
 203                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 204                 case SSL_ST_OK|SSL_ST_ACCEPT:
 205
 206                         s->server=1;
 207                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 208
 209                         if ((s->version>>8) != 3)
 210                                 {
 211                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 212                                 return -1;
 213                                 }
 214                         s->type=SSL_ST_ACCEPT;
 215
 216                         if (s->init_buf == NULL)
 217                                 {
 218                                 if ((buf=BUF_MEM_new()) == NULL)
 219                                         {
 220                                         ret= -1;
 221                                         goto end;
 222                                         }
 223                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 224                                         {
 225                                         ret= -1;
 226                                         goto end;
 227                                         }
 228                                 s->init_buf=buf;
 229                                 }
 230
 231                         if (!ssl3_setup_buffers(s))
 232                                 {
 233                                 ret= -1;
 234                                 goto end;
 235                                 }
 236
 237                         s->init_num=0;
 238                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
 239
 240                         if (s->state != SSL_ST_RENEGOTIATE)
 241                                 {
 242                                 /* Ok, we now need to push on a buffering BIO so that
 243                                  * the output is sent in a way that TCP likes :-)
 244                                  */
 245                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 246
 247                                 ssl3_init_finished_mac(s);
 248                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 249                                 s->ctx->stats.sess_accept++;
 250                                 }
 251                         else if (!s->s3->send_connection_binding &&
 252                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
 253                                 {
 254                                 /* Server attempting to renegotiate with
 255                                  * client that doesn't support secure
 256                                  * renegotiation.
 257                                  */
 258                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
 259                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 260                                 ret = -1;
 261                                 goto end;
 262                                 }
 263                         else
 264                                 {
 265                                 /* s->state == SSL_ST_RENEGOTIATE,
 266                                  * we will just send a HelloRequest */
 267                                 s->ctx->stats.sess_accept_renegotiate++;
 268                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 269                                 }
 270                         break;
 271
 272                 case SSL3_ST_SW_HELLO_REQ_A:
 273                 case SSL3_ST_SW_HELLO_REQ_B:
 274
 275                         s->shutdown=0;
 276                         ret=ssl3_send_hello_request(s);
 277                         if (ret <= 0) goto end;
 278                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 279                         s->state=SSL3_ST_SW_FLUSH;
 280                         s->init_num=0;
 281
 282                         ssl3_init_finished_mac(s);
 283                         break;
 284
 285                 case SSL3_ST_SW_HELLO_REQ_C:
 286                         s->state=SSL_ST_OK;
 287                         break;
 288
 289                 case SSL3_ST_SR_CLNT_HELLO_A:
 290                 case SSL3_ST_SR_CLNT_HELLO_B:
 291                 case SSL3_ST_SR_CLNT_HELLO_C:
 292
 293                         s->shutdown=0;
 294                         ret=ssl3_get_client_hello(s);
 295                         if (ret <= 0) goto end;
 296                         s->new_session = 2;
 297                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 298                         s->init_num=0;
 299                         break;
 300
 301                 case SSL3_ST_SW_SRVR_HELLO_A:
 302                 case SSL3_ST_SW_SRVR_HELLO_B:
 303                         ret=ssl3_send_server_hello(s);
 304                         if (ret <= 0) goto end;
 305 #ifndef OPENSSL_NO_TLSEXT
 306                         if (s->hit)
 307                                 {
 308                                 if (s->tlsext_ticket_expected)
 309                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 310                                 else
 311                                         s->state=SSL3_ST_SW_CHANGE_A;
 312                                 }
 313 #else
 314                         if (s->hit)
 315                                         s->state=SSL3_ST_SW_CHANGE_A;
 316 #endif
 317                         else
 318                                 s->state=SSL3_ST_SW_CERT_A;
 319                         s->init_num=0;
 320                         break;
 321
 322                 case SSL3_ST_SW_CERT_A:
 323                 case SSL3_ST_SW_CERT_B:
 324                         /* Check if it is anon DH or anon ECDH or KRB5 */
 325                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)
 326                                 && !(s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 327                                 {
 328                                 ret=ssl3_send_server_certificate(s);
 329                                 if (ret <= 0) goto end;
 330 #ifndef OPENSSL_NO_TLSEXT
 331                                 if (s->tlsext_status_expected)
 332                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 333                                 else
 334                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 335                                 }
 336                         else
 337                                 {
 338                                 skip = 1;
 339                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 340                                 }
 341 #else
 342                                 }
 343                         else
 344                                 skip=1;
 345
 346                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 347 #endif
 348                         s->init_num=0;
 349                         break;
 350
 351                 case SSL3_ST_SW_KEY_EXCH_A:
 352                 case SSL3_ST_SW_KEY_EXCH_B:
 353                         l=s->s3->tmp.new_cipher->algorithms;
 354
 355                         /* clear this, it may get reset by
 356                          * send_server_key_exchange */
 357                         s->s3->tmp.use_rsa_tmp=0;
 358
 359
 360                         /* only send if a DH key exchange, fortezza or
 361                          * RSA but we have a sign only certificate
 362                          *
 363                          * For ECC ciphersuites, we send a serverKeyExchange
 364                          * message only if the cipher suite is either
 365                          * ECDH-anon or ECDHE. In other cases, the
 366                          * server certificate contains the server's
 367                          * public key for key exchange.
 368                          */
 369                         if ((l & SSL_kECDHE)
 370                             || (l & (SSL_DH|SSL_kFZA))
 371                             || ((l & SSL_kRSA)
 372                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 373                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 374                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 375                                         )
 376                                     )
 377                                 )
 378                             )
 379                                 {
 380                                 ret=ssl3_send_server_key_exchange(s);
 381                                 if (ret <= 0) goto end;
 382                                 }
 383                         else
 384                                 skip=1;
 385
 386                         s->state=SSL3_ST_SW_CERT_REQ_A;
 387                         s->init_num=0;
 388                         break;
 389
 390                 case SSL3_ST_SW_CERT_REQ_A:
 391                 case SSL3_ST_SW_CERT_REQ_B:
 392                         if (/* don't request cert unless asked for it: */
 393                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 394                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 395                                  * don't request cert during re-negotiation: */
 396                                 ((s->session->peer != NULL) &&
 397                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 398                                 /* never request cert in anonymous ciphersuites
 399                                  * (see section "Certificate request" in SSL 3 drafts
 400                                  * and in RFC 2246): */
 401                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 402                                  /* ... except when the application insists on verification
 403                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 404                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 405                                  /* never request cert in Kerberos ciphersuites */
 406                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 407                                 {
 408                                 /* no cert request */
 409                                 skip=1;
 410                                 s->s3->tmp.cert_request=0;
 411                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 412                                 }
 413                         else
 414                                 {
 415                                 s->s3->tmp.cert_request=1;
 416                                 ret=ssl3_send_certificate_request(s);
 417                                 if (ret <= 0) goto end;
 418 #ifndef NETSCAPE_HANG_BUG
 419                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 420 #else
 421                                 s->state=SSL3_ST_SW_FLUSH;
 422                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 423 #endif
 424                                 s->init_num=0;
 425                                 }
 426                         break;
 427
 428                 case SSL3_ST_SW_SRVR_DONE_A:
 429                 case SSL3_ST_SW_SRVR_DONE_B:
 430                         ret=ssl3_send_server_done(s);
 431                         if (ret <= 0) goto end;
 432                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 433                         s->state=SSL3_ST_SW_FLUSH;
 434                         s->init_num=0;
 435                         break;
 436
 437                 case SSL3_ST_SW_FLUSH:
 438
 439                         /* This code originally checked to see if
 440                          * any data was pending using BIO_CTRL_INFO
 441                          * and then flushed. This caused problems
 442                          * as documented in PR#1939. The proposed
 443                          * fix doesn't completely resolve this issue
 444                          * as buggy implementations of BIO_CTRL_PENDING
 445                          * still exist. So instead we just flush
 446                          * unconditionally.
 447                          */
 448
 449                         s->rwstate=SSL_WRITING;
 450                         if (BIO_flush(s->wbio) <= 0)
 451                                 {
 452                                 ret= -1;
 453                                 goto end;
 454                                 }
 455                         s->rwstate=SSL_NOTHING;
 456
 457                         s->state=s->s3->tmp.next_state;
 458                         break;
 459
 460                 case SSL3_ST_SR_CERT_A:
 461                 case SSL3_ST_SR_CERT_B:
 462                         /* Check for second client hello (MS SGC) */
 463                         ret = ssl3_check_client_hello(s);
 464                         if (ret <= 0)
 465                                 goto end;
 466                         if (ret == 2)
 467                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 468                         else {
 469                                 if (s->s3->tmp.cert_request)
 470                                         {
 471                                         ret=ssl3_get_client_certificate(s);
 472                                         if (ret <= 0) goto end;
 473                                         }
 474                                 s->init_num=0;
 475                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 476                         }
 477                         break;
 478
 479                 case SSL3_ST_SR_KEY_EXCH_A:
 480                 case SSL3_ST_SR_KEY_EXCH_B:
 481                         ret=ssl3_get_client_key_exchange(s);
 482                         if (ret <= 0)
 483                                 goto end;
 484                         if (ret == 2)
 485                                 {
 486                                 /* For the ECDH ciphersuites when
 487                                  * the client sends its ECDH pub key in
 488                                  * a certificate, the CertificateVerify
 489                                  * message is not sent.
 490                                  */
 491                                 s->state=SSL3_ST_SR_FINISHED_A;
 492                                 s->init_num = 0;
 493                                 }
 494                         else
 495                                 {
 496                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 497                                 s->init_num=0;
 498
 499                                 /* We need to get hashes here so if there is
 500                                  * a client cert, it can be verified
 501                                  */
 502                                 s->method->ssl3_enc->cert_verify_mac(s,
 503                                     &(s->s3->finish_dgst1),
 504                                     &(s->s3->tmp.cert_verify_md[0]));
 505                                 s->method->ssl3_enc->cert_verify_mac(s,
 506                                     &(s->s3->finish_dgst2),
 507                                     &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 508                                 }
 509                         break;
 510
 511                 case SSL3_ST_SR_CERT_VRFY_A:
 512                 case SSL3_ST_SR_CERT_VRFY_B:
 513
 514                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 515                         /* we should decide if we expected this one */
 516                         ret=ssl3_get_cert_verify(s);
 517                         if (ret <= 0) goto end;
 518
 519                         s->state=SSL3_ST_SR_FINISHED_A;
 520                         s->init_num=0;
 521                         break;
 522
 523                 case SSL3_ST_SR_FINISHED_A:
 524                 case SSL3_ST_SR_FINISHED_B:
 525                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 526                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 527                                 SSL3_ST_SR_FINISHED_B);
 528                         if (ret <= 0) goto end;
 529                         if (s->hit)
 530                                 s->state=SSL_ST_OK;
 531 #ifndef OPENSSL_NO_TLSEXT
 532                         else if (s->tlsext_ticket_expected)
 533                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 534 #endif
 535                         else
 536                                 s->state=SSL3_ST_SW_CHANGE_A;
 537                         s->init_num=0;
 538                         break;
 539
 540 #ifndef OPENSSL_NO_TLSEXT
 541                 case SSL3_ST_SW_SESSION_TICKET_A:
 542                 case SSL3_ST_SW_SESSION_TICKET_B:
 543                         ret=ssl3_send_newsession_ticket(s);
 544                         if (ret <= 0) goto end;
 545                         s->state=SSL3_ST_SW_CHANGE_A;
 546                         s->init_num=0;
 547                         break;
 548
 549                 case SSL3_ST_SW_CERT_STATUS_A:
 550                 case SSL3_ST_SW_CERT_STATUS_B:
 551                         ret=ssl3_send_cert_status(s);
 552                         if (ret <= 0) goto end;
 553                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 554                         s->init_num=0;
 555                         break;
 556
 557 #endif
 558
 559                 case SSL3_ST_SW_CHANGE_A:
 560                 case SSL3_ST_SW_CHANGE_B:
 561
 562                         s->session->cipher=s->s3->tmp.new_cipher;
 563                         if (!s->method->ssl3_enc->setup_key_block(s))
 564                                 { ret= -1; goto end; }
 565
 566                         ret=ssl3_send_change_cipher_spec(s,
 567                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 568
 569                         if (ret <= 0) goto end;
 570                         s->state=SSL3_ST_SW_FINISHED_A;
 571                         s->init_num=0;
 572
 573                         if (!s->method->ssl3_enc->change_cipher_state(s,
 574                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 575                                 {
 576                                 ret= -1;
 577                                 goto end;
 578                                 }
 579
 580                         break;
 581
 582                 case SSL3_ST_SW_FINISHED_A:
 583                 case SSL3_ST_SW_FINISHED_B:
 584                         ret=ssl3_send_finished(s,
 585                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 586                                 s->method->ssl3_enc->server_finished_label,
 587                                 s->method->ssl3_enc->server_finished_label_len);
 588                         if (ret <= 0) goto end;
 589                         s->state=SSL3_ST_SW_FLUSH;
 590                         if (s->hit)
 591                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 592                         else
 593                                 s->s3->tmp.next_state=SSL_ST_OK;
 594                         s->init_num=0;
 595                         break;
 596
 597                 case SSL_ST_OK:
 598                         /* clean a few things up */
 599                         ssl3_cleanup_key_block(s);
 600
 601                         BUF_MEM_free(s->init_buf);
 602                         s->init_buf=NULL;
 603
 604                         /* remove buffering on output */
 605                         ssl_free_wbio_buffer(s);
 606
 607                         s->init_num=0;
 608
 609                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 610                                 {
 611                                 /* actually not necessarily a 'new' session unless
 612                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 613
 614                                 s->new_session=0;
 615
 616                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 617
 618                                 s->ctx->stats.sess_accept_good++;
 619                                 /* s->server=1; */
 620                                 s->handshake_func=ssl3_accept;
 621
 622                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 623                                 }
 624
 625                         ret = 1;
 626                         goto end;
 627                         /* break; */
 628
 629                 default:
 630                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 631                         ret= -1;
 632                         goto end;
 633                         /* break; */
 634                         }
 635
 636                 if (!s->s3->tmp.reuse_message && !skip)
 637                         {
 638                         if (s->debug)
 639                                 {
 640                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 641                                         goto end;
 642                                 }
 643
 644
 645                         if ((cb != NULL) && (s->state != state))
 646                                 {
 647                                 new_state=s->state;
 648                                 s->state=state;
 649                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 650                                 s->state=new_state;
 651                                 }
 652                         }
 653                 skip=0;
 654                 }
 655 end:
 656         /* BIO_flush(s->wbio); */
 657
 658         s->in_handshake--;
 659         if (cb != NULL)
 660                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 661         return(ret);
 662         }
 663
 664 int ssl3_send_hello_request(SSL *s)
 665         {
 666         unsigned char *p;
 667
 668         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 669                 {
 670                 p=(unsigned char *)s->init_buf->data;
 671                 *(p++)=SSL3_MT_HELLO_REQUEST;
 672                 *(p++)=0;
 673                 *(p++)=0;
 674                 *(p++)=0;
 675
 676                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 677                 /* number of bytes to write */
 678                 s->init_num=4;
 679                 s->init_off=0;
 680                 }
 681
 682         /* SSL3_ST_SW_HELLO_REQ_B */
 683         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 684         }
 685
 686 int ssl3_check_client_hello(SSL *s)
 687         {
 688         int ok;
 689         long n;
 690
 691         /* this function is called when we really expect a Certificate message,
 692          * so permit appropriate message length */
 693         n=s->method->ssl_get_message(s,
 694                 SSL3_ST_SR_CERT_A,
 695                 SSL3_ST_SR_CERT_B,
 696                 -1,
 697                 s->max_cert_list,
 698                 &ok);
 699         if (!ok) return((int)n);
 700         s->s3->tmp.reuse_message = 1;
 701         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 702                 {
 703                 /* We only allow the client to restart the handshake once per
 704                  * negotiation. */
 705                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
 706                         {
 707                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
 708                         return -1;
 709                         }
 710                 /* Throw away what we have done so far in the current handshake,
 711                  * which will now be aborted. (A full SSL_clear would be too much.) */
 712 #ifndef OPENSSL_NO_DH
 713                 if (s->s3->tmp.dh != NULL)
 714                         {
 715                         DH_free(s->s3->tmp.dh);
 716                         s->s3->tmp.dh = NULL;
 717                         }
 718 #endif
 719 #ifndef OPENSSL_NO_ECDH
 720                 if (s->s3->tmp.ecdh != NULL)
 721                         {
 722                         EC_KEY_free(s->s3->tmp.ecdh);
 723                         s->s3->tmp.ecdh = NULL;
 724                         }
 725 #endif
 726                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
 727                 return 2;
 728                 }
 729         return 1;
 730 }
 731
 732 int ssl3_get_client_hello(SSL *s)
 733         {
 734         int i,j,ok,al,ret= -1;
 735         unsigned int cookie_len;
 736         long n;
 737         unsigned long id;
 738         unsigned char *p,*d,*q;
 739         SSL_CIPHER *c;
 740 #ifndef OPENSSL_NO_COMP
 741         SSL_COMP *comp=NULL;
 742 #endif
 743         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 744
 745         /* We do this so that we will respond with our native type.
 746          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 747          * This down switching should be handled by a different method.
 748          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 749          * TLSv1.
 750          */
 751         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 752                 {
 753                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 754                 }
 755         s->first_packet=1;
 756         n=s->method->ssl_get_message(s,
 757                 SSL3_ST_SR_CLNT_HELLO_B,
 758                 SSL3_ST_SR_CLNT_HELLO_C,
 759                 SSL3_MT_CLIENT_HELLO,
 760                 SSL3_RT_MAX_PLAIN_LENGTH,
 761                 &ok);
 762
 763         if (!ok) return((int)n);
 764         s->first_packet=0;
 765         d=p=(unsigned char *)s->init_msg;
 766
 767         /* use version from inside client hello, not from record header
 768          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 769         s->client_version=(((int)p[0])<<8)|(int)p[1];
 770         p+=2;
 771
 772         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 773             (s->version != DTLS1_VERSION && s->client_version < s->version))
 774                 {
 775                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 776                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 777                         {
 778                         /* similar to ssl3_get_record, send alert using remote version number */
 779                         s->version = s->client_version;
 780                         }
 781                 al = SSL_AD_PROTOCOL_VERSION;
 782                 goto f_err;
 783                 }
 784
 785         /* If we require cookies and this ClientHello doesn't
 786          * contain one, just return since we do not want to
 787          * allocate any memory yet. So check cookie length...
 788          */
 789         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
 790                 {
 791                 unsigned int session_length, cookie_length;
 792
 793                 session_length = *(p + SSL3_RANDOM_SIZE);
 794                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
 795
 796                 if (cookie_length == 0)
 797                         return 1;
 798                 }
 799
 800         /* load the client random */
 801         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 802         p+=SSL3_RANDOM_SIZE;
 803
 804         /* get the session-id */
 805         j= *(p++);
 806
 807         s->hit=0;
 808         /* Versions before 0.9.7 always allow session reuse during renegotiation
 809          * (i.e. when s->new_session is true), option
 810          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
 811          * Maybe this optional behaviour should always have been the default,
 812          * but we cannot safely change the default behaviour (or new applications
 813          * might be written that become totally unsecure when compiled with
 814          * an earlier library version)
 815          */
 816         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 817                 {
 818                 if (!ssl_get_new_session(s,1))
 819                         goto err;
 820                 }
 821         else
 822                 {
 823                 i=ssl_get_prev_session(s, p, j, d + n);
 824                 if (i == 1)
 825                         { /* previous session */
 826                         s->hit=1;
 827                         }
 828                 else if (i == -1)
 829                         goto err;
 830                 else /* i == 0 */
 831                         {
 832                         if (!ssl_get_new_session(s,1))
 833                                 goto err;
 834                         }
 835                 }
 836
 837         p+=j;
 838
 839         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
 840                 {
 841                 /* cookie stuff */
 842                 cookie_len = *(p++);
 843
 844                 /*
 845                  * The ClientHello may contain a cookie even if the
 846                  * HelloVerify message has not been sent--make sure that it
 847                  * does not cause an overflow.
 848                  */
 849                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
 850                         {
 851                         /* too much data */
 852                         al = SSL_AD_DECODE_ERROR;
 853                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 854                         goto f_err;
 855                         }
 856
 857                 /* verify the cookie if appropriate option is set. */
 858                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 859                         cookie_len > 0)
 860                         {
 861                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
 862
 863                         if ( s->ctx->app_verify_cookie_cb != NULL)
 864                                 {
 865                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
 866                                         cookie_len) == 0)
 867                                         {
 868                                         al=SSL_AD_HANDSHAKE_FAILURE;
 869                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 870                                                 SSL_R_COOKIE_MISMATCH);
 871                                         goto f_err;
 872                                         }
 873                                 /* else cookie verification succeeded */
 874                                 }
 875                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
 876                                                   s->d1->cookie_len) != 0) /* default verification */
 877                                 {
 878                                         al=SSL_AD_HANDSHAKE_FAILURE;
 879                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 880                                                 SSL_R_COOKIE_MISMATCH);
 881                                         goto f_err;
 882                                 }
 883
 884                         ret = 2;
 885                         }
 886
 887                 p += cookie_len;
 888                 }
 889
 890         n2s(p,i);
 891         if ((i == 0) && (j != 0))
 892                 {
 893                 /* we need a cipher if we are not resuming a session */
 894                 al=SSL_AD_ILLEGAL_PARAMETER;
 895                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 896                 goto f_err;
 897                 }
 898         if ((p+i) >= (d+n))
 899                 {
 900                 /* not enough data */
 901                 al=SSL_AD_DECODE_ERROR;
 902                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 903                 goto f_err;
 904                 }
 905         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 906                 == NULL))
 907                 {
 908                 goto err;
 909                 }
 910         p+=i;
 911
 912         /* If it is a hit, check that the cipher is in the list */
 913         if ((s->hit) && (i > 0))
 914                 {
 915                 j=0;
 916                 id=s->session->cipher->id;
 917
 918 #ifdef CIPHER_DEBUG
 919                 printf("client sent %d ciphers\n",sk_num(ciphers));
 920 #endif
 921                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 922                         {
 923                         c=sk_SSL_CIPHER_value(ciphers,i);
 924 #ifdef CIPHER_DEBUG
 925                         printf("client [%2d of %2d]:%s\n",
 926                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 927 #endif
 928                         if (c->id == id)
 929                                 {
 930                                 j=1;
 931                                 break;
 932                                 }
 933                         }
 934 /* Disabled because it can be used in a ciphersuite downgrade
 935  * attack: CVE-2010-4180.
 936  */
 937 #if 0
 938                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 939                         {
 940                         /* Special case as client bug workaround: the previously used cipher may
 941                          * not be in the current list, the client instead might be trying to
 942                          * continue using a cipher that before wasn't chosen due to server
 943                          * preferences.  We'll have to reject the connection if the cipher is not
 944                          * enabled, though. */
 945                         c = sk_SSL_CIPHER_value(ciphers, 0);
 946                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
 947                                 {
 948                                 s->session->cipher = c;
 949                                 j = 1;
 950                                 }
 951                         }
 952 #endif
 953                 if (j == 0)
 954                         {
 955                         /* we need to have the cipher in the cipher
 956                          * list if we are asked to reuse it */
 957                         al=SSL_AD_ILLEGAL_PARAMETER;
 958                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 959                         goto f_err;
 960                         }
 961                 }
 962
 963         /* compression */
 964         i= *(p++);
 965         if ((p+i) > (d+n))
 966                 {
 967                 /* not enough data */
 968                 al=SSL_AD_DECODE_ERROR;
 969                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 970                 goto f_err;
 971                 }
 972         q=p;
 973         for (j=0; j<i; j++)
 974                 {
 975                 if (p[j] == 0) break;
 976                 }
 977
 978         p+=i;
 979         if (j >= i)
 980                 {
 981                 /* no compress */
 982                 al=SSL_AD_DECODE_ERROR;
 983                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 984                 goto f_err;
 985                 }
 986
 987 #ifndef OPENSSL_NO_TLSEXT
 988         /* TLS extensions*/
 989         if (s->version >= SSL3_VERSION)
 990                 {
 991                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
 992                         {
 993                         /* 'al' set by ssl_parse_clienthello_tlsext */
 994                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
 995                         goto f_err;
 996                         }
 997                 }
 998                 if (ssl_check_clienthello_tlsext_early(s) <= 0) {
 999                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1000                         goto err;
1001                 }
1002 #endif
1003         /* Worst case, we will use the NULL compression, but if we have other
1004          * options, we will now look for them.  We have i-1 compression
1005          * algorithms from the client, starting at q. */
1006         s->s3->tmp.new_compression=NULL;
1007 #ifndef OPENSSL_NO_COMP
1008         if (s->ctx->comp_methods != NULL)
1009                 { /* See if we have a match */
1010                 int m,nn,o,v,done=0;
1011
1012                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1013                 for (m=0; m<nn; m++)
1014                         {
1015                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1016                         v=comp->id;
1017                         for (o=0; o<i; o++)
1018                                 {
1019                                 if (v == q[o])
1020                                         {
1021                                         done=1;
1022                                         break;
1023                                         }
1024                                 }
1025                         if (done) break;
1026                         }
1027                 if (done)
1028                         s->s3->tmp.new_compression=comp;
1029                 else
1030                         comp=NULL;
1031                 }
1032 #endif
1033
1034         /* TLS does not mind if there is extra stuff */
1035 #if 0   /* SSL 3.0 does not mind either, so we should disable this test
1036          * (was enabled in 0.9.6d through 0.9.6j and 0.9.7 through 0.9.7b,
1037          * in earlier SSLeay/OpenSSL releases this test existed but was buggy) */
1038         if (s->version == SSL3_VERSION)
1039                 {
1040                 if (p < (d+n))
1041                         {
1042                         /* wrong number of bytes,
1043                          * there could be more to follow */
1044                         al=SSL_AD_DECODE_ERROR;
1045                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1046                         goto f_err;
1047                         }
1048                 }
1049 #endif
1050
1051         /* Given s->session->ciphers and SSL_get_ciphers, we must
1052          * pick a cipher */
1053
1054         if (!s->hit)
1055                 {
1056 #ifdef OPENSSL_NO_COMP
1057                 s->session->compress_meth=0;
1058 #else
1059                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1060 #endif
1061                 if (s->session->ciphers != NULL)
1062                         sk_SSL_CIPHER_free(s->session->ciphers);
1063                 s->session->ciphers=ciphers;
1064                 if (ciphers == NULL)
1065                         {
1066                         al=SSL_AD_ILLEGAL_PARAMETER;
1067                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1068                         goto f_err;
1069                         }
1070                 ciphers=NULL;
1071                 c=ssl3_choose_cipher(s,s->session->ciphers,
1072                                      SSL_get_ciphers(s));
1073
1074                 if (c == NULL)
1075                         {
1076                         al=SSL_AD_HANDSHAKE_FAILURE;
1077                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1078                         goto f_err;
1079                         }
1080                 s->s3->tmp.new_cipher=c;
1081                 }
1082         else
1083                 {
1084                 /* Session-id reuse */
1085 #ifdef REUSE_CIPHER_BUG
1086                 STACK_OF(SSL_CIPHER) *sk;
1087                 SSL_CIPHER *nc=NULL;
1088                 SSL_CIPHER *ec=NULL;
1089
1090                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1091                         {
1092                         sk=s->session->ciphers;
1093                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1094                                 {
1095                                 c=sk_SSL_CIPHER_value(sk,i);
1096                                 if (c->algorithms & SSL_eNULL)
1097                                         nc=c;
1098                                 if (SSL_C_IS_EXPORT(c))
1099                                         ec=c;
1100                                 }
1101                         if (nc != NULL)
1102                                 s->s3->tmp.new_cipher=nc;
1103                         else if (ec != NULL)
1104                                 s->s3->tmp.new_cipher=ec;
1105                         else
1106                                 s->s3->tmp.new_cipher=s->session->cipher;
1107                         }
1108                 else
1109 #endif
1110                 s->s3->tmp.new_cipher=s->session->cipher;
1111                 }
1112
1113         /* we now have the following setup.
1114          * client_random
1115          * cipher_list          - our prefered list of ciphers
1116          * ciphers              - the clients prefered list of ciphers
1117          * compression          - basically ignored right now
1118          * ssl version is set   - sslv3
1119          * s->session           - The ssl session has been setup.
1120          * s->hit               - session reuse flag
1121          * s->tmp.new_cipher    - the new cipher to use.
1122          */
1123
1124 #ifndef OPENSSL_NO_TLSEXT
1125         /* Handles TLS extensions that we couldn't check earlier */
1126         if (s->version >= SSL3_VERSION)
1127                 {
1128                 if (ssl_check_clienthello_tlsext_late(s) <= 0)
1129                         {
1130                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1131                         goto err;
1132                         }
1133                 }
1134 #endif
1135
1136         if (ret < 0) ret=1;
1137         if (0)
1138                 {
1139 f_err:
1140                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1141                 }
1142 err:
1143         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1144         return(ret);
1145         }
1146
1147 int ssl3_send_server_hello(SSL *s)
1148         {
1149         unsigned char *buf;
1150         unsigned char *p,*d;
1151         int i,sl;
1152         unsigned long l,Time;
1153
1154         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1155                 {
1156                 buf=(unsigned char *)s->init_buf->data;
1157                 p=s->s3->server_random;
1158                 Time=(unsigned long)time(NULL);                 /* Time */
1159                 l2n(Time,p);
1160                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1161                         return -1;
1162                 /* Do the message type and length last */
1163                 d=p= &(buf[4]);
1164
1165                 *(p++)=s->version>>8;
1166                 *(p++)=s->version&0xff;
1167
1168                 /* Random stuff */
1169                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1170                 p+=SSL3_RANDOM_SIZE;
1171
1172                 /* now in theory we have 3 options to sending back the
1173                  * session id.  If it is a re-use, we send back the
1174                  * old session-id, if it is a new session, we send
1175                  * back the new session-id or we send back a 0 length
1176                  * session-id if we want it to be single use.
1177                  * Currently I will not implement the '0' length session-id
1178                  * 12-Jan-98 - I'll now support the '0' length stuff.
1179                  *
1180                  * We also have an additional case where stateless session
1181                  * resumption is successful: we always send back the old
1182                  * session id. In this case s->hit is non zero: this can
1183                  * only happen if stateless session resumption is succesful
1184                  * if session caching is disabled so existing functionality
1185                  * is unaffected.
1186                  */
1187                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1188                         && !s->hit)
1189                         s->session->session_id_length=0;
1190
1191                 sl=s->session->session_id_length;
1192                 if (sl > (int)sizeof(s->session->session_id))
1193                         {
1194                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1195                         return -1;
1196                         }
1197                 *(p++)=sl;
1198                 memcpy(p,s->session->session_id,sl);
1199                 p+=sl;
1200
1201                 /* put the cipher */
1202                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1203                 p+=i;
1204
1205                 /* put the compression method */
1206 #ifdef OPENSSL_NO_COMP
1207                         *(p++)=0;
1208 #else
1209                 if (s->s3->tmp.new_compression == NULL)
1210                         *(p++)=0;
1211                 else
1212                         *(p++)=s->s3->tmp.new_compression->id;
1213 #endif
1214 #ifndef OPENSSL_NO_TLSEXT
1215                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1216                         {
1217                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1218                         return -1;
1219                         }
1220 #endif
1221                 /* do the header */
1222                 l=(p-d);
1223                 d=buf;
1224                 *(d++)=SSL3_MT_SERVER_HELLO;
1225                 l2n3(l,d);
1226
1227                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1228                 /* number of bytes to write */
1229                 s->init_num=p-buf;
1230                 s->init_off=0;
1231                 }
1232
1233         /* SSL3_ST_SW_SRVR_HELLO_B */
1234         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1235         }
1236
1237 int ssl3_send_server_done(SSL *s)
1238         {
1239         unsigned char *p;
1240
1241         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1242                 {
1243                 p=(unsigned char *)s->init_buf->data;
1244
1245                 /* do the header */
1246                 *(p++)=SSL3_MT_SERVER_DONE;
1247                 *(p++)=0;
1248                 *(p++)=0;
1249                 *(p++)=0;
1250
1251                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1252                 /* number of bytes to write */
1253                 s->init_num=4;
1254                 s->init_off=0;
1255                 }
1256
1257         /* SSL3_ST_SW_SRVR_DONE_B */
1258         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1259         }
1260
1261 int ssl3_send_server_key_exchange(SSL *s)
1262         {
1263 #ifndef OPENSSL_NO_RSA
1264         unsigned char *q;
1265         int j,num;
1266         RSA *rsa;
1267         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1268         unsigned int u;
1269 #endif
1270 #ifndef OPENSSL_NO_DH
1271         DH *dh=NULL,*dhp;
1272 #endif
1273 #ifndef OPENSSL_NO_ECDH
1274         EC_KEY *ecdh=NULL, *ecdhp;
1275         unsigned char *encodedPoint = NULL;
1276         int encodedlen = 0;
1277         int curve_id = 0;
1278         BN_CTX *bn_ctx = NULL;
1279 #endif
1280         EVP_PKEY *pkey;
1281         unsigned char *p,*d;
1282         int al,i;
1283         unsigned long type;
1284         int n;
1285         CERT *cert;
1286         BIGNUM *r[4];
1287         int nr[4],kn;
1288         BUF_MEM *buf;
1289         EVP_MD_CTX md_ctx;
1290
1291         EVP_MD_CTX_init(&md_ctx);
1292         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1293                 {
1294                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1295                 cert=s->cert;
1296
1297                 buf=s->init_buf;
1298
1299                 r[0]=r[1]=r[2]=r[3]=NULL;
1300                 n=0;
1301 #ifndef OPENSSL_NO_RSA
1302                 if (type & SSL_kRSA)
1303                         {
1304                         rsa=cert->rsa_tmp;
1305                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1306                                 {
1307                                 rsa=s->cert->rsa_tmp_cb(s,
1308                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1309                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1310                                 if(rsa == NULL)
1311                                 {
1312                                         al=SSL_AD_HANDSHAKE_FAILURE;
1313                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1314                                         goto f_err;
1315                                 }
1316                                 RSA_up_ref(rsa);
1317                                 cert->rsa_tmp=rsa;
1318                                 }
1319                         if (rsa == NULL)
1320                                 {
1321                                 al=SSL_AD_HANDSHAKE_FAILURE;
1322                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1323                                 goto f_err;
1324                                 }
1325                         r[0]=rsa->n;
1326                         r[1]=rsa->e;
1327                         s->s3->tmp.use_rsa_tmp=1;
1328                         }
1329                 else
1330 #endif
1331 #ifndef OPENSSL_NO_DH
1332                         if (type & SSL_kEDH)
1333                         {
1334                         dhp=cert->dh_tmp;
1335                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1336                                 dhp=s->cert->dh_tmp_cb(s,
1337                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1338                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1339                         if (dhp == NULL)
1340                                 {
1341                                 al=SSL_AD_HANDSHAKE_FAILURE;
1342                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1343                                 goto f_err;
1344                                 }
1345
1346                         if (s->s3->tmp.dh != NULL)
1347                                 {
1348                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1349                                 goto err;
1350                                 }
1351
1352                         if ((dh=DHparams_dup(dhp)) == NULL)
1353                                 {
1354                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1355                                 goto err;
1356                                 }
1357
1358                         s->s3->tmp.dh=dh;
1359                         if ((dhp->pub_key == NULL ||
1360                              dhp->priv_key == NULL ||
1361                              (s->options & SSL_OP_SINGLE_DH_USE)))
1362                                 {
1363                                 if(!DH_generate_key(dh))
1364                                     {
1365                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1366                                            ERR_R_DH_LIB);
1367                                     goto err;
1368                                     }
1369                                 }
1370                         else
1371                                 {
1372                                 dh->pub_key=BN_dup(dhp->pub_key);
1373                                 dh->priv_key=BN_dup(dhp->priv_key);
1374                                 if ((dh->pub_key == NULL) ||
1375                                         (dh->priv_key == NULL))
1376                                         {
1377                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1378                                         goto err;
1379                                         }
1380                                 }
1381                         r[0]=dh->p;
1382                         r[1]=dh->g;
1383                         r[2]=dh->pub_key;
1384                         }
1385                 else
1386 #endif
1387 #ifndef OPENSSL_NO_ECDH
1388                         if (type & SSL_kECDHE)
1389                         {
1390                         const EC_GROUP *group;
1391
1392                         ecdhp=cert->ecdh_tmp;
1393                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1394                                 {
1395                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1396                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1397                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1398                                 }
1399                         if (ecdhp == NULL)
1400                                 {
1401                                 al=SSL_AD_HANDSHAKE_FAILURE;
1402                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1403                                 goto f_err;
1404                                 }
1405
1406                         if (s->s3->tmp.ecdh != NULL)
1407                                 {
1408                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1409                                 goto err;
1410                                 }
1411
1412                         /* Duplicate the ECDH structure. */
1413                         if (ecdhp == NULL)
1414                                 {
1415                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1416                                 goto err;
1417                                 }
1418                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1419                                 {
1420                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1421                                 goto err;
1422                                 }
1423
1424                         s->s3->tmp.ecdh=ecdh;
1425                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1426                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1427                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1428                                 {
1429                                 if(!EC_KEY_generate_key(ecdh))
1430                                     {
1431                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1432                                     goto err;
1433                                     }
1434                                 }
1435
1436                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1437                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1438                             (EC_KEY_get0_private_key(ecdh) == NULL))
1439                                 {
1440                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1441                                 goto err;
1442                                 }
1443
1444                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1445                             (EC_GROUP_get_degree(group) > 163))
1446                                 {
1447                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1448                                 goto err;
1449                                 }
1450
1451                         /* XXX: For now, we only support ephemeral ECDH
1452                          * keys over named (not generic) curves. For
1453                          * supported named curves, curve_id is non-zero.
1454                          */
1455                         if ((curve_id =
1456                             nid2curve_id(EC_GROUP_get_curve_name(group)))
1457                             == 0)
1458                                 {
1459                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1460                                 goto err;
1461                                 }
1462
1463                         /* Encode the public key.
1464                          * First check the size of encoding and
1465                          * allocate memory accordingly.
1466                          */
1467                         encodedlen = EC_POINT_point2oct(group,
1468                             EC_KEY_get0_public_key(ecdh),
1469                             POINT_CONVERSION_UNCOMPRESSED,
1470                             NULL, 0, NULL);
1471
1472                         encodedPoint = (unsigned char *)
1473                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1474                         bn_ctx = BN_CTX_new();
1475                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1476                                 {
1477                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1478                                 goto err;
1479                                 }
1480
1481
1482                         encodedlen = EC_POINT_point2oct(group,
1483                             EC_KEY_get0_public_key(ecdh),
1484                             POINT_CONVERSION_UNCOMPRESSED,
1485                             encodedPoint, encodedlen, bn_ctx);
1486
1487                         if (encodedlen == 0)
1488                                 {
1489                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1490                                 goto err;
1491                                 }
1492
1493                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1494
1495                         /* XXX: For now, we only support named (not
1496                          * generic) curves in ECDH ephemeral key exchanges.
1497                          * In this situation, we need four additional bytes
1498                          * to encode the entire ServerECDHParams
1499                          * structure.
1500                          */
1501                         n = 4 + encodedlen;
1502
1503                         /* We'll generate the serverKeyExchange message
1504                          * explicitly so we can set these to NULLs
1505                          */
1506                         r[0]=NULL;
1507                         r[1]=NULL;
1508                         r[2]=NULL;
1509                         r[3]=NULL;
1510                         }
1511                 else
1512 #endif /* !OPENSSL_NO_ECDH */
1513                         {
1514                         al=SSL_AD_HANDSHAKE_FAILURE;
1515                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1516                         goto f_err;
1517                         }
1518                 for (i=0; r[i] != NULL; i++)
1519                         {
1520                         nr[i]=BN_num_bytes(r[i]);
1521                         n+=2+nr[i];
1522                         }
1523
1524                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1525                         {
1526                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1527                                 == NULL)
1528                                 {
1529                                 al=SSL_AD_DECODE_ERROR;
1530                                 goto f_err;
1531                                 }
1532                         kn=EVP_PKEY_size(pkey);
1533                         }
1534                 else
1535                         {
1536                         pkey=NULL;
1537                         kn=0;
1538                         }
1539
1540                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1541                         {
1542                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1543                         goto err;
1544                         }
1545                 d=(unsigned char *)s->init_buf->data;
1546                 p= &(d[4]);
1547
1548                 for (i=0; r[i] != NULL; i++)
1549                         {
1550                         s2n(nr[i],p);
1551                         BN_bn2bin(r[i],p);
1552                         p+=nr[i];
1553                         }
1554
1555 #ifndef OPENSSL_NO_ECDH
1556                 if (type & SSL_kECDHE)
1557                         {
1558                         /* XXX: For now, we only support named (not generic) curves.
1559                          * In this situation, the serverKeyExchange message has:
1560                          * [1 byte CurveType], [2 byte CurveName]
1561                          * [1 byte length of encoded point], followed by
1562                          * the actual encoded point itself
1563                          */
1564                         *p = NAMED_CURVE_TYPE;
1565                         p += 1;
1566                         *p = 0;
1567                         p += 1;
1568                         *p = curve_id;
1569                         p += 1;
1570                         *p = encodedlen;
1571                         p += 1;
1572                         memcpy((unsigned char*)p,
1573                             (unsigned char *)encodedPoint,
1574                             encodedlen);
1575                         OPENSSL_free(encodedPoint);
1576                         encodedPoint = NULL;
1577                         p += encodedlen;
1578                         }
1579 #endif
1580
1581                 /* not anonymous */
1582                 if (pkey != NULL)
1583                         {
1584                         /* n is the length of the params, they start at &(d[4])
1585                          * and p points to the space at the end. */
1586 #ifndef OPENSSL_NO_RSA
1587                         if (pkey->type == EVP_PKEY_RSA)
1588                                 {
1589                                 q=md_buf;
1590                                 j=0;
1591                                 for (num=2; num > 0; num--)
1592                                         {
1593                                         EVP_MD_CTX_set_flags(&md_ctx,
1594                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1595                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1596                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1597                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1598                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1599                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1600                                         EVP_DigestFinal_ex(&md_ctx,q,
1601                                                 (unsigned int *)&i);
1602                                         q+=i;
1603                                         j+=i;
1604                                         }
1605                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1606                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1607                                         {
1608                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1609                                         goto err;
1610                                         }
1611                                 s2n(u,p);
1612                                 n+=u+2;
1613                                 }
1614                         else
1615 #endif
1616 #if !defined(OPENSSL_NO_DSA)
1617                                 if (pkey->type == EVP_PKEY_DSA)
1618                                 {
1619                                 /* lets do DSS */
1620                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1621                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1622                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1623                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1624                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1625                                         (unsigned int *)&i,pkey))
1626                                         {
1627                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1628                                         goto err;
1629                                         }
1630                                 s2n(i,p);
1631                                 n+=i+2;
1632                                 }
1633                         else
1634 #endif
1635 #if !defined(OPENSSL_NO_ECDSA)
1636                                 if (pkey->type == EVP_PKEY_EC)
1637                                 {
1638                                 /* let's do ECDSA */
1639                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1640                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1641                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1642                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1643                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1644                                         (unsigned int *)&i,pkey))
1645                                         {
1646                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1647                                         goto err;
1648                                         }
1649                                 s2n(i,p);
1650                                 n+=i+2;
1651                                 }
1652                         else
1653 #endif
1654                                 {
1655                                 /* Is this error check actually needed? */
1656                                 al=SSL_AD_HANDSHAKE_FAILURE;
1657                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1658                                 goto f_err;
1659                                 }
1660                         }
1661
1662                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1663                 l2n3(n,d);
1664
1665                 /* we should now have things packed up, so lets send
1666                  * it off */
1667                 s->init_num=n+4;
1668                 s->init_off=0;
1669                 }
1670
1671         s->state = SSL3_ST_SW_KEY_EXCH_B;
1672         EVP_MD_CTX_cleanup(&md_ctx);
1673         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1674 f_err:
1675         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1676 err:
1677 #ifndef OPENSSL_NO_ECDH
1678         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1679         BN_CTX_free(bn_ctx);
1680 #endif
1681         EVP_MD_CTX_cleanup(&md_ctx);
1682         return(-1);
1683         }
1684
1685 int ssl3_send_certificate_request(SSL *s)
1686         {
1687         unsigned char *p,*d;
1688         int i,j,nl,off,n;
1689         STACK_OF(X509_NAME) *sk=NULL;
1690         X509_NAME *name;
1691         BUF_MEM *buf;
1692
1693         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1694                 {
1695                 buf=s->init_buf;
1696
1697                 d=p=(unsigned char *)&(buf->data[4]);
1698
1699                 /* get the list of acceptable cert types */
1700                 p++;
1701                 n=ssl3_get_req_cert_type(s,p);
1702                 d[0]=n;
1703                 p+=n;
1704                 n++;
1705
1706                 off=n;
1707                 p+=2;
1708                 n+=2;
1709
1710                 sk=SSL_get_client_CA_list(s);
1711                 nl=0;
1712                 if (sk != NULL)
1713                         {
1714                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1715                                 {
1716                                 name=sk_X509_NAME_value(sk,i);
1717                                 j=i2d_X509_NAME(name,NULL);
1718                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1719                                         {
1720                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1721                                         goto err;
1722                                         }
1723                                 p=(unsigned char *)&(buf->data[4+n]);
1724                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1725                                         {
1726                                         s2n(j,p);
1727                                         i2d_X509_NAME(name,&p);
1728                                         n+=2+j;
1729                                         nl+=2+j;
1730                                         }
1731                                 else
1732                                         {
1733                                         d=p;
1734                                         i2d_X509_NAME(name,&p);
1735                                         j-=2; s2n(j,d); j+=2;
1736                                         n+=j;
1737                                         nl+=j;
1738                                         }
1739                                 }
1740                         }
1741                 /* else no CA names */
1742                 p=(unsigned char *)&(buf->data[4+off]);
1743                 s2n(nl,p);
1744
1745                 d=(unsigned char *)buf->data;
1746                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1747                 l2n3(n,d);
1748
1749                 /* we should now have things packed up, so lets send
1750                  * it off */
1751
1752                 s->init_num=n+4;
1753                 s->init_off=0;
1754 #ifdef NETSCAPE_HANG_BUG
1755                 if (!BUF_MEM_grow_clean(buf, s->init_num + 4))
1756                         {
1757                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1758                         goto err;
1759                         }
1760                 p=(unsigned char *)s->init_buf->data + s->init_num;
1761
1762                 /* do the header */
1763                 *(p++)=SSL3_MT_SERVER_DONE;
1764                 *(p++)=0;
1765                 *(p++)=0;
1766                 *(p++)=0;
1767                 s->init_num += 4;
1768 #endif
1769
1770                 s->state = SSL3_ST_SW_CERT_REQ_B;
1771                 }
1772
1773         /* SSL3_ST_SW_CERT_REQ_B */
1774         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1775 err:
1776         return(-1);
1777         }
1778
1779 int ssl3_get_client_key_exchange(SSL *s)
1780         {
1781         int i,al,ok;
1782         long n;
1783         unsigned long l;
1784         unsigned char *p;
1785 #ifndef OPENSSL_NO_RSA
1786         RSA *rsa=NULL;
1787         EVP_PKEY *pkey=NULL;
1788 #endif
1789 #ifndef OPENSSL_NO_DH
1790         BIGNUM *pub=NULL;
1791         DH *dh_srvr;
1792 #endif
1793 #ifndef OPENSSL_NO_KRB5
1794         KSSL_ERR kssl_err;
1795 #endif /* OPENSSL_NO_KRB5 */
1796
1797 #ifndef OPENSSL_NO_ECDH
1798         EC_KEY *srvr_ecdh = NULL;
1799         EVP_PKEY *clnt_pub_pkey = NULL;
1800         EC_POINT *clnt_ecpoint = NULL;
1801         BN_CTX *bn_ctx = NULL;
1802 #endif
1803
1804         n=s->method->ssl_get_message(s,
1805                 SSL3_ST_SR_KEY_EXCH_A,
1806                 SSL3_ST_SR_KEY_EXCH_B,
1807                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1808                 2048, /* ??? */
1809                 &ok);
1810
1811         if (!ok) return((int)n);
1812         p=(unsigned char *)s->init_msg;
1813
1814         l=s->s3->tmp.new_cipher->algorithms;
1815
1816 #ifndef OPENSSL_NO_RSA
1817         if (l & SSL_kRSA)
1818                 {
1819                 /* FIX THIS UP EAY EAY EAY EAY */
1820                 if (s->s3->tmp.use_rsa_tmp)
1821                         {
1822                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1823                                 rsa=s->cert->rsa_tmp;
1824                         /* Don't do a callback because rsa_tmp should
1825                          * be sent already */
1826                         if (rsa == NULL)
1827                                 {
1828                                 al=SSL_AD_HANDSHAKE_FAILURE;
1829                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1830                                 goto f_err;
1831
1832                                 }
1833                         }
1834                 else
1835                         {
1836                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1837                         if (    (pkey == NULL) ||
1838                                 (pkey->type != EVP_PKEY_RSA) ||
1839                                 (pkey->pkey.rsa == NULL))
1840                                 {
1841                                 al=SSL_AD_HANDSHAKE_FAILURE;
1842                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1843                                 goto f_err;
1844                                 }
1845                         rsa=pkey->pkey.rsa;
1846                         }
1847
1848                 /* TLS and [incidentally] DTLS, including pre-0.9.8f */
1849                 if (s->version > SSL3_VERSION &&
1850                     s->client_version != DTLS1_BAD_VER)
1851                         {
1852                         n2s(p,i);
1853                         if (n != i+2)
1854                                 {
1855                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1856                                         {
1857                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1858                                         goto err;
1859                                         }
1860                                 else
1861                                         p-=2;
1862                                 }
1863                         else
1864                                 n=i;
1865                         }
1866
1867                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1868
1869                 al = -1;
1870
1871                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1872                         {
1873                         al=SSL_AD_DECODE_ERROR;
1874                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
1875                         }
1876
1877                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1878                         {
1879                         /* The premaster secret must contain the same version number as the
1880                          * ClientHello to detect version rollback attacks (strangely, the
1881                          * protocol does not offer such protection for DH ciphersuites).
1882                          * However, buggy clients exist that send the negotiated protocol
1883                          * version instead if the server does not support the requested
1884                          * protocol version.
1885                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1886                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1887                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1888                                 {
1889                                 al=SSL_AD_DECODE_ERROR;
1890                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1891
1892                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1893                                  * (http://eprint.iacr.org/2003/052/) exploits the version
1894                                  * number check as a "bad version oracle" -- an alert would
1895                                  * reveal that the plaintext corresponding to some ciphertext
1896                                  * made up by the adversary is properly formatted except
1897                                  * that the version number is wrong.  To avoid such attacks,
1898                                  * we should treat this just like any other decryption error. */
1899                                 }
1900                         }
1901
1902                 if (al != -1)
1903                         {
1904                         /* Some decryption failure -- use random value instead as countermeasure
1905                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1906                          * (see RFC 2246, section 7.4.7.1). */
1907                         ERR_clear_error();
1908                         i = SSL_MAX_MASTER_KEY_LENGTH;
1909                         p[0] = s->client_version >> 8;
1910                         p[1] = s->client_version & 0xff;
1911                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
1912                                 goto err;
1913                         }
1914
1915                 s->session->master_key_length=
1916                         s->method->ssl3_enc->generate_master_secret(s,
1917                                 s->session->master_key,
1918                                 p,i);
1919                 OPENSSL_cleanse(p,i);
1920                 }
1921         else
1922 #endif
1923 #ifndef OPENSSL_NO_DH
1924                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1925                 {
1926                 n2s(p,i);
1927                 if (n != i+2)
1928                         {
1929                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1930                                 {
1931                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1932                                 goto err;
1933                                 }
1934                         else
1935                                 {
1936                                 p-=2;
1937                                 i=(int)n;
1938                                 }
1939                         }
1940
1941                 if (n == 0L) /* the parameters are in the cert */
1942                         {
1943                         al=SSL_AD_HANDSHAKE_FAILURE;
1944                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1945                         goto f_err;
1946                         }
1947                 else
1948                         {
1949                         if (s->s3->tmp.dh == NULL)
1950                                 {
1951                                 al=SSL_AD_HANDSHAKE_FAILURE;
1952                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1953                                 goto f_err;
1954                                 }
1955                         else
1956                                 dh_srvr=s->s3->tmp.dh;
1957                         }
1958
1959                 pub=BN_bin2bn(p,i,NULL);
1960                 if (pub == NULL)
1961                         {
1962                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1963                         goto err;
1964                         }
1965
1966                 i=DH_compute_key(p,pub,dh_srvr);
1967
1968                 if (i <= 0)
1969                         {
1970                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1971                         BN_clear_free(pub);
1972                         goto err;
1973                         }
1974
1975                 DH_free(s->s3->tmp.dh);
1976                 s->s3->tmp.dh=NULL;
1977
1978                 BN_clear_free(pub);
1979                 pub=NULL;
1980                 s->session->master_key_length=
1981                         s->method->ssl3_enc->generate_master_secret(s,
1982                                 s->session->master_key,p,i);
1983                 OPENSSL_cleanse(p,i);
1984                 }
1985         else
1986 #endif
1987 #ifndef OPENSSL_NO_KRB5
1988         if (l & SSL_kKRB5)
1989                 {
1990                 krb5_error_code         krb5rc;
1991                 krb5_data               enc_ticket;
1992                 krb5_data               authenticator;
1993                 krb5_data               enc_pms;
1994                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
1995                 EVP_CIPHER_CTX          ciph_ctx;
1996                 EVP_CIPHER              *enc = NULL;
1997                 unsigned char           iv[EVP_MAX_IV_LENGTH];
1998                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
1999                                                + EVP_MAX_BLOCK_LENGTH];
2000                 int                     padl, outl;
2001                 krb5_timestamp          authtime = 0;
2002                 krb5_ticket_times       ttimes;
2003
2004                 EVP_CIPHER_CTX_init(&ciph_ctx);
2005
2006                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2007
2008                 n2s(p,i);
2009                 enc_ticket.length = i;
2010
2011                 if (n < (int)enc_ticket.length + 6)
2012                         {
2013                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2014                                 SSL_R_DATA_LENGTH_TOO_LONG);
2015                         goto err;
2016                         }
2017
2018                 enc_ticket.data = (char *)p;
2019                 p+=enc_ticket.length;
2020
2021                 n2s(p,i);
2022                 authenticator.length = i;
2023
2024                 if (n < (int)(enc_ticket.length + authenticator.length) + 6)
2025                         {
2026                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2027                                 SSL_R_DATA_LENGTH_TOO_LONG);
2028                         goto err;
2029                         }
2030
2031                 authenticator.data = (char *)p;
2032                 p+=authenticator.length;
2033
2034                 n2s(p,i);
2035                 enc_pms.length = i;
2036                 enc_pms.data = (char *)p;
2037                 p+=enc_pms.length;
2038
2039                 /* Note that the length is checked again below,
2040                 ** after decryption
2041                 */
2042                 if(enc_pms.length > sizeof pms)
2043                         {
2044                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2045                                SSL_R_DATA_LENGTH_TOO_LONG);
2046                         goto err;
2047                         }
2048
2049                 if (n != (long)(enc_ticket.length + authenticator.length +
2050                                                 enc_pms.length + 6))
2051                         {
2052                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2053                                 SSL_R_DATA_LENGTH_TOO_LONG);
2054                         goto err;
2055                         }
2056
2057                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2058                                         &kssl_err)) != 0)
2059                         {
2060 #ifdef KSSL_DEBUG
2061                         printf("kssl_sget_tkt rtn %d [%d]\n",
2062                                 krb5rc, kssl_err.reason);
2063                         if (kssl_err.text)
2064                                 printf("kssl_err text= %s\n", kssl_err.text);
2065 #endif  /* KSSL_DEBUG */
2066                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2067                                 kssl_err.reason);
2068                         goto err;
2069                         }
2070
2071                 /*  Note: no authenticator is not considered an error,
2072                 **  but will return authtime == 0.
2073                 */
2074                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2075                                         &authtime, &kssl_err)) != 0)
2076                         {
2077 #ifdef KSSL_DEBUG
2078                         printf("kssl_check_authent rtn %d [%d]\n",
2079                                 krb5rc, kssl_err.reason);
2080                         if (kssl_err.text)
2081                                 printf("kssl_err text= %s\n", kssl_err.text);
2082 #endif  /* KSSL_DEBUG */
2083                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2084                                 kssl_err.reason);
2085                         goto err;
2086                         }
2087
2088                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2089                         {
2090                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2091                         goto err;
2092                         }
2093
2094 #ifdef KSSL_DEBUG
2095                 kssl_ctx_show(kssl_ctx);
2096 #endif  /* KSSL_DEBUG */
2097
2098                 enc = kssl_map_enc(kssl_ctx->enctype);
2099                 if (enc == NULL)
2100                     goto err;
2101
2102                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2103
2104                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2105                         {
2106                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2107                                 SSL_R_DECRYPTION_FAILED);
2108                         goto err;
2109                         }
2110                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2111                                         (unsigned char *)enc_pms.data, enc_pms.length))
2112                         {
2113                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2114                                 SSL_R_DECRYPTION_FAILED);
2115                         goto err;
2116                         }
2117                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2118                         {
2119                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2120                                 SSL_R_DATA_LENGTH_TOO_LONG);
2121                         goto err;
2122                         }
2123                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2124                         {
2125                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2126                                 SSL_R_DECRYPTION_FAILED);
2127                         goto err;
2128                         }
2129                 outl += padl;
2130                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2131                         {
2132                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2133                                 SSL_R_DATA_LENGTH_TOO_LONG);
2134                         goto err;
2135                         }
2136                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2137                     {
2138                     /* The premaster secret must contain the same version number as the
2139                      * ClientHello to detect version rollback attacks (strangely, the
2140                      * protocol does not offer such protection for DH ciphersuites).
2141                      * However, buggy clients exist that send random bytes instead of
2142                      * the protocol version.
2143                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2144                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2145                      */
2146                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2147                         {
2148                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2149                                SSL_AD_DECODE_ERROR);
2150                         goto err;
2151                         }
2152                     }
2153
2154                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2155
2156                 s->session->master_key_length=
2157                         s->method->ssl3_enc->generate_master_secret(s,
2158                                 s->session->master_key, pms, outl);
2159
2160                 if (kssl_ctx->client_princ)
2161                         {
2162                         size_t len = strlen(kssl_ctx->client_princ);
2163                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2164                                 {
2165                                 s->session->krb5_client_princ_len = len;
2166                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2167                                 }
2168                         }
2169
2170
2171                 /*  Was doing kssl_ctx_free() here,
2172                 **  but it caused problems for apache.
2173                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2174                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2175                 */
2176                 }
2177         else
2178 #endif  /* OPENSSL_NO_KRB5 */
2179
2180 #ifndef OPENSSL_NO_ECDH
2181                 if ((l & SSL_kECDH) || (l & SSL_kECDHE))
2182                 {
2183                 int ret = 1;
2184                 int field_size = 0;
2185                 const EC_KEY   *tkey;
2186                 const EC_GROUP *group;
2187                 const BIGNUM *priv_key;
2188
2189                 /* initialize structures for server's ECDH key pair */
2190                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2191                         {
2192                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2193                             ERR_R_MALLOC_FAILURE);
2194                         goto err;
2195                         }
2196
2197                 /* Let's get server private key and group information */
2198                 if (l & SSL_kECDH)
2199                         {
2200                         /* use the certificate */
2201                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2202                         }
2203                 else
2204                         {
2205                         /* use the ephermeral values we saved when
2206                          * generating the ServerKeyExchange msg.
2207                          */
2208                         tkey = s->s3->tmp.ecdh;
2209                         }
2210
2211                 group    = EC_KEY_get0_group(tkey);
2212                 priv_key = EC_KEY_get0_private_key(tkey);
2213
2214                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2215                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2216                         {
2217                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2218                                ERR_R_EC_LIB);
2219                         goto err;
2220                         }
2221
2222                 /* Let's get client's public key */
2223                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2224                         {
2225                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2226                             ERR_R_MALLOC_FAILURE);
2227                         goto err;
2228                         }
2229
2230                 if (n == 0L)
2231                         {
2232                         /* Client Publickey was in Client Certificate */
2233
2234                          if (l & SSL_kECDHE)
2235                                  {
2236                                  al=SSL_AD_HANDSHAKE_FAILURE;
2237                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2238                                  goto f_err;
2239                                  }
2240                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2241                             == NULL) ||
2242                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2243                                 {
2244                                 /* XXX: For now, we do not support client
2245                                  * authentication using ECDH certificates
2246                                  * so this branch (n == 0L) of the code is
2247                                  * never executed. When that support is
2248                                  * added, we ought to ensure the key
2249                                  * received in the certificate is
2250                                  * authorized for key agreement.
2251                                  * ECDH_compute_key implicitly checks that
2252                                  * the two ECDH shares are for the same
2253                                  * group.
2254                                  */
2255                                 al=SSL_AD_HANDSHAKE_FAILURE;
2256                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2257                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2258                                 goto f_err;
2259                                 }
2260
2261                         if (EC_POINT_copy(clnt_ecpoint,
2262                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2263                                 {
2264                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2265                                         ERR_R_EC_LIB);
2266                                 goto err;
2267                                 }
2268                         ret = 2; /* Skip certificate verify processing */
2269                         }
2270                 else
2271                         {
2272                         /* Get client's public key from encoded point
2273                          * in the ClientKeyExchange message.
2274                          */
2275                         if ((bn_ctx = BN_CTX_new()) == NULL)
2276                                 {
2277                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2278                                     ERR_R_MALLOC_FAILURE);
2279                                 goto err;
2280                                 }
2281
2282                         /* Get encoded point length */
2283                         i = *p;
2284                         p += 1;
2285                         if (n != 1 + i)
2286                                 {
2287                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2288                                     ERR_R_EC_LIB);
2289                                 goto err;
2290                                 }
2291                         if (EC_POINT_oct2point(group,
2292                             clnt_ecpoint, p, i, bn_ctx) == 0)
2293                                 {
2294                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2295                                     ERR_R_EC_LIB);
2296                                 goto err;
2297                                 }
2298                         /* p is pointing to somewhere in the buffer
2299                          * currently, so set it to the start
2300                          */
2301                         p=(unsigned char *)s->init_buf->data;
2302                         }
2303
2304                 /* Compute the shared pre-master secret */
2305                 field_size = EC_GROUP_get_degree(group);
2306                 if (field_size <= 0)
2307                         {
2308                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2309                                ERR_R_ECDH_LIB);
2310                         goto err;
2311                         }
2312                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2313                 if (i <= 0)
2314                         {
2315                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2316                             ERR_R_ECDH_LIB);
2317                         goto err;
2318                         }
2319
2320                 EVP_PKEY_free(clnt_pub_pkey);
2321                 EC_POINT_free(clnt_ecpoint);
2322                 if (srvr_ecdh != NULL)
2323                         EC_KEY_free(srvr_ecdh);
2324                 BN_CTX_free(bn_ctx);
2325
2326                 /* Compute the master secret */
2327                 s->session->master_key_length = s->method->ssl3_enc-> \
2328                     generate_master_secret(s, s->session->master_key, p, i);
2329
2330                 OPENSSL_cleanse(p, i);
2331                 return (ret);
2332                 }
2333         else
2334 #endif
2335                 {
2336                 al=SSL_AD_HANDSHAKE_FAILURE;
2337                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2338                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2339                 goto f_err;
2340                 }
2341
2342         return(1);
2343 f_err:
2344         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2345 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2346 err:
2347 #endif
2348 #ifndef OPENSSL_NO_ECDH
2349         EVP_PKEY_free(clnt_pub_pkey);
2350         EC_POINT_free(clnt_ecpoint);
2351         if (srvr_ecdh != NULL)
2352                 EC_KEY_free(srvr_ecdh);
2353         BN_CTX_free(bn_ctx);
2354 #endif
2355         return(-1);
2356         }
2357
2358 int ssl3_get_cert_verify(SSL *s)
2359         {
2360         EVP_PKEY *pkey=NULL;
2361         unsigned char *p;
2362         int al,ok,ret=0;
2363         long n;
2364         int type=0,i,j;
2365         X509 *peer;
2366
2367         n=s->method->ssl_get_message(s,
2368                 SSL3_ST_SR_CERT_VRFY_A,
2369                 SSL3_ST_SR_CERT_VRFY_B,
2370                 -1,
2371                 514, /* 514? */
2372                 &ok);
2373
2374         if (!ok) return((int)n);
2375
2376         if (s->session->peer != NULL)
2377                 {
2378                 peer=s->session->peer;
2379                 pkey=X509_get_pubkey(peer);
2380                 type=X509_certificate_type(peer,pkey);
2381                 }
2382         else
2383                 {
2384                 peer=NULL;
2385                 pkey=NULL;
2386                 }
2387
2388         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2389                 {
2390                 s->s3->tmp.reuse_message=1;
2391                 if (peer != NULL)
2392                         {
2393                         al=SSL_AD_UNEXPECTED_MESSAGE;
2394                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2395                         goto f_err;
2396                         }
2397                 ret=1;
2398                 goto end;
2399                 }
2400
2401         if (peer == NULL)
2402                 {
2403                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2404                 al=SSL_AD_UNEXPECTED_MESSAGE;
2405                 goto f_err;
2406                 }
2407
2408         if (!(type & EVP_PKT_SIGN))
2409                 {
2410                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2411                 al=SSL_AD_ILLEGAL_PARAMETER;
2412                 goto f_err;
2413                 }
2414
2415         if (s->s3->change_cipher_spec)
2416                 {
2417                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2418                 al=SSL_AD_UNEXPECTED_MESSAGE;
2419                 goto f_err;
2420                 }
2421
2422         /* we now have a signature that we need to verify */
2423         p=(unsigned char *)s->init_msg;
2424         n2s(p,i);
2425         n-=2;
2426         if (i > n)
2427                 {
2428                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2429                 al=SSL_AD_DECODE_ERROR;
2430                 goto f_err;
2431                 }
2432
2433         j=EVP_PKEY_size(pkey);
2434         if ((i > j) || (n > j) || (n <= 0))
2435                 {
2436                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2437                 al=SSL_AD_DECODE_ERROR;
2438                 goto f_err;
2439                 }
2440
2441 #ifndef OPENSSL_NO_RSA
2442         if (pkey->type == EVP_PKEY_RSA)
2443                 {
2444                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2445                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
2446                                                         pkey->pkey.rsa);
2447                 if (i < 0)
2448                         {
2449                         al=SSL_AD_DECRYPT_ERROR;
2450                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2451                         goto f_err;
2452                         }
2453                 if (i == 0)
2454                         {
2455                         al=SSL_AD_DECRYPT_ERROR;
2456                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2457                         goto f_err;
2458                         }
2459                 }
2460         else
2461 #endif
2462 #ifndef OPENSSL_NO_DSA
2463                 if (pkey->type == EVP_PKEY_DSA)
2464                 {
2465                 j=DSA_verify(pkey->save_type,
2466                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2467                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2468                 if (j <= 0)
2469                         {
2470                         /* bad signature */
2471                         al=SSL_AD_DECRYPT_ERROR;
2472                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2473                         goto f_err;
2474                         }
2475                 }
2476         else
2477 #endif
2478 #ifndef OPENSSL_NO_ECDSA
2479                 if (pkey->type == EVP_PKEY_EC)
2480                 {
2481                 j=ECDSA_verify(pkey->save_type,
2482                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2483                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2484                 if (j <= 0)
2485                         {
2486                         /* bad signature */
2487                         al=SSL_AD_DECRYPT_ERROR;
2488                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2489                             SSL_R_BAD_ECDSA_SIGNATURE);
2490                         goto f_err;
2491                         }
2492                 }
2493         else
2494 #endif
2495                 {
2496                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2497                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2498                 goto f_err;
2499                 }
2500
2501
2502         ret=1;
2503         if (0)
2504                 {
2505 f_err:
2506                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2507                 }
2508 end:
2509         EVP_PKEY_free(pkey);
2510         return(ret);
2511         }
2512
2513 int ssl3_get_client_certificate(SSL *s)
2514         {
2515         int i,ok,al,ret= -1;
2516         X509 *x=NULL;
2517         unsigned long l,nc,llen,n;
2518         const unsigned char *p,*q;
2519         unsigned char *d;
2520         STACK_OF(X509) *sk=NULL;
2521
2522         n=s->method->ssl_get_message(s,
2523                 SSL3_ST_SR_CERT_A,
2524                 SSL3_ST_SR_CERT_B,
2525                 -1,
2526                 s->max_cert_list,
2527                 &ok);
2528
2529         if (!ok) return((int)n);
2530
2531         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2532                 {
2533                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2534                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2535                         {
2536                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2537                         al=SSL_AD_HANDSHAKE_FAILURE;
2538                         goto f_err;
2539                         }
2540                 /* If tls asked for a client cert, the client must return a 0 list */
2541                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2542                         {
2543                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2544                         al=SSL_AD_UNEXPECTED_MESSAGE;
2545                         goto f_err;
2546                         }
2547                 s->s3->tmp.reuse_message=1;
2548                 return(1);
2549                 }
2550
2551         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2552                 {
2553                 al=SSL_AD_UNEXPECTED_MESSAGE;
2554                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2555                 goto f_err;
2556                 }
2557         p=d=(unsigned char *)s->init_msg;
2558
2559         if ((sk=sk_X509_new_null()) == NULL)
2560                 {
2561                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2562                 goto err;
2563                 }
2564
2565         n2l3(p,llen);
2566         if (llen+3 != n)
2567                 {
2568                 al=SSL_AD_DECODE_ERROR;
2569                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2570                 goto f_err;
2571                 }
2572         for (nc=0; nc<llen; )
2573                 {
2574                 n2l3(p,l);
2575                 if ((l+nc+3) > llen)
2576                         {
2577                         al=SSL_AD_DECODE_ERROR;
2578                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2579                         goto f_err;
2580                         }
2581
2582                 q=p;
2583                 x=d2i_X509(NULL,&p,l);
2584                 if (x == NULL)
2585                         {
2586                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2587                         goto err;
2588                         }
2589                 if (p != (q+l))
2590                         {
2591                         al=SSL_AD_DECODE_ERROR;
2592                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2593                         goto f_err;
2594                         }
2595                 if (!sk_X509_push(sk,x))
2596                         {
2597                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2598                         goto err;
2599                         }
2600                 x=NULL;
2601                 nc+=l+3;
2602                 }
2603
2604         if (sk_X509_num(sk) <= 0)
2605                 {
2606                 /* TLS does not mind 0 certs returned */
2607                 if (s->version == SSL3_VERSION)
2608                         {
2609                         al=SSL_AD_HANDSHAKE_FAILURE;
2610                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2611                         goto f_err;
2612                         }
2613                 /* Fail for TLS only if we required a certificate */
2614                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2615                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2616                         {
2617                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2618                         al=SSL_AD_HANDSHAKE_FAILURE;
2619                         goto f_err;
2620                         }
2621                 }
2622         else
2623                 {
2624                 i=ssl_verify_cert_chain(s,sk);
2625                 if (i <= 0)
2626                         {
2627                         al=ssl_verify_alarm_type(s->verify_result);
2628                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2629                         goto f_err;
2630                         }
2631                 }
2632
2633         if (s->session->peer != NULL) /* This should not be needed */
2634                 X509_free(s->session->peer);
2635         s->session->peer=sk_X509_shift(sk);
2636         s->session->verify_result = s->verify_result;
2637
2638         /* With the current implementation, sess_cert will always be NULL
2639          * when we arrive here. */
2640         if (s->session->sess_cert == NULL)
2641                 {
2642                 s->session->sess_cert = ssl_sess_cert_new();
2643                 if (s->session->sess_cert == NULL)
2644                         {
2645                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2646                         goto err;
2647                         }
2648                 }
2649         if (s->session->sess_cert->cert_chain != NULL)
2650                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2651         s->session->sess_cert->cert_chain=sk;
2652         /* Inconsistency alert: cert_chain does *not* include the
2653          * peer's own certificate, while we do include it in s3_clnt.c */
2654
2655         sk=NULL;
2656
2657         ret=1;
2658         if (0)
2659                 {
2660 f_err:
2661                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2662                 }
2663 err:
2664         if (x != NULL) X509_free(x);
2665         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2666         return(ret);
2667         }
2668
2669 int ssl3_send_server_certificate(SSL *s)
2670         {
2671         unsigned long l;
2672         X509 *x;
2673
2674         if (s->state == SSL3_ST_SW_CERT_A)
2675                 {
2676                 x=ssl_get_server_send_cert(s);
2677                 if (x == NULL &&
2678                         /* VRS: allow null cert if auth == KRB5 */
2679                         (s->s3->tmp.new_cipher->algorithms
2680                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
2681                         != (SSL_aKRB5|SSL_kKRB5))
2682                         {
2683                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2684                         return(0);
2685                         }
2686
2687                 l=ssl3_output_cert_chain(s,x);
2688                 s->state=SSL3_ST_SW_CERT_B;
2689                 s->init_num=(int)l;
2690                 s->init_off=0;
2691                 }
2692
2693         /* SSL3_ST_SW_CERT_B */
2694         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2695         }
2696
2697
2698 #ifndef OPENSSL_NO_ECDH
2699 /* This is the complement of curve_id2nid in s3_clnt.c. */
2700 static int nid2curve_id(int nid)
2701 {
2702         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2703          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2704         switch (nid) {
2705         case NID_sect163k1: /* sect163k1 (1) */
2706                 return 1;
2707         case NID_sect163r1: /* sect163r1 (2) */
2708                 return 2;
2709         case NID_sect163r2: /* sect163r2 (3) */
2710                 return 3;
2711         case NID_sect193r1: /* sect193r1 (4) */
2712                 return 4;
2713         case NID_sect193r2: /* sect193r2 (5) */
2714                 return 5;
2715         case NID_sect233k1: /* sect233k1 (6) */
2716                 return 6;
2717         case NID_sect233r1: /* sect233r1 (7) */
2718                 return 7;
2719         case NID_sect239k1: /* sect239k1 (8) */
2720                 return 8;
2721         case NID_sect283k1: /* sect283k1 (9) */
2722                 return 9;
2723         case NID_sect283r1: /* sect283r1 (10) */
2724                 return 10;
2725         case NID_sect409k1: /* sect409k1 (11) */
2726                 return 11;
2727         case NID_sect409r1: /* sect409r1 (12) */
2728                 return 12;
2729         case NID_sect571k1: /* sect571k1 (13) */
2730                 return 13;
2731         case NID_sect571r1: /* sect571r1 (14) */
2732                 return 14;
2733         case NID_secp160k1: /* secp160k1 (15) */
2734                 return 15;
2735         case NID_secp160r1: /* secp160r1 (16) */
2736                 return 16;
2737         case NID_secp160r2: /* secp160r2 (17) */
2738                 return 17;
2739         case NID_secp192k1: /* secp192k1 (18) */
2740                 return 18;
2741         case NID_X9_62_prime192v1: /* secp192r1 (19) */
2742                 return 19;
2743         case NID_secp224k1: /* secp224k1 (20) */
2744                 return 20;
2745         case NID_secp224r1: /* secp224r1 (21) */
2746                 return 21;
2747         case NID_secp256k1: /* secp256k1 (22) */
2748                 return 22;
2749         case NID_X9_62_prime256v1: /* secp256r1 (23) */
2750                 return 23;
2751         case NID_secp384r1: /* secp384r1 (24) */
2752                 return 24;
2753         case NID_secp521r1:  /* secp521r1 (25) */
2754                 return 25;
2755         default:
2756                 return 0;
2757         }
2758 }
2759 #endif
2760 #ifndef OPENSSL_NO_TLSEXT
2761 int ssl3_send_newsession_ticket(SSL *s)
2762         {
2763         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
2764                 {
2765                 unsigned char *p, *senc, *macstart;
2766                 int len, slen;
2767                 unsigned int hlen;
2768                 EVP_CIPHER_CTX ctx;
2769                 HMAC_CTX hctx;
2770                 SSL_CTX *tctx = s->initial_ctx;
2771                 unsigned char iv[EVP_MAX_IV_LENGTH];
2772                 unsigned char key_name[16];
2773
2774                 /* get session encoding length */
2775                 slen = i2d_SSL_SESSION(s->session, NULL);
2776                 /* Some length values are 16 bits, so forget it if session is
2777                  * too long
2778                  */
2779                 if (slen > 0xFF00)
2780                         return -1;
2781                 /* Grow buffer if need be: the length calculation is as
2782                  * follows 1 (size of message name) + 3 (message length
2783                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
2784                  * 16 (key name) + max_iv_len (iv length) +
2785                  * session_length + max_enc_block_size (max encrypted session
2786                  * length) + max_md_size (HMAC).
2787                  */
2788                 if (!BUF_MEM_grow(s->init_buf,
2789                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
2790                         EVP_MAX_MD_SIZE + slen))
2791                         return -1;
2792                 senc = OPENSSL_malloc(slen);
2793                 if (!senc)
2794                         return -1;
2795                 p = senc;
2796                 i2d_SSL_SESSION(s->session, &p);
2797
2798                 p=(unsigned char *)s->init_buf->data;
2799                 /* do the header */
2800                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
2801                 /* Skip message length for now */
2802                 p += 3;
2803                 EVP_CIPHER_CTX_init(&ctx);
2804                 HMAC_CTX_init(&hctx);
2805                 /* Initialize HMAC and cipher contexts. If callback present
2806                  * it does all the work otherwise use generated values
2807                  * from parent ctx.
2808                  */
2809                 if (tctx->tlsext_ticket_key_cb)
2810                         {
2811                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
2812                                                          &hctx, 1) < 0)
2813                                 {
2814                                 OPENSSL_free(senc);
2815                                 return -1;
2816                                 }
2817                         }
2818                 else
2819                         {
2820                         RAND_pseudo_bytes(iv, 16);
2821                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
2822                                         tctx->tlsext_tick_aes_key, iv);
2823                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
2824                                         tlsext_tick_md(), NULL);
2825                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
2826                         }
2827                 l2n(s->session->tlsext_tick_lifetime_hint, p);
2828                 /* Skip ticket length for now */
2829                 p += 2;
2830                 /* Output key name */
2831                 macstart = p;
2832                 memcpy(p, key_name, 16);
2833                 p += 16;
2834                 /* output IV */
2835                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
2836                 p += EVP_CIPHER_CTX_iv_length(&ctx);
2837                 /* Encrypt session data */
2838                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
2839                 p += len;
2840                 EVP_EncryptFinal(&ctx, p, &len);
2841                 p += len;
2842                 EVP_CIPHER_CTX_cleanup(&ctx);
2843
2844                 HMAC_Update(&hctx, macstart, p - macstart);
2845                 HMAC_Final(&hctx, p, &hlen);
2846                 HMAC_CTX_cleanup(&hctx);
2847
2848                 p += hlen;
2849                 /* Now write out lengths: p points to end of data written */
2850                 /* Total length */
2851                 len = p - (unsigned char *)s->init_buf->data;
2852                 p=(unsigned char *)s->init_buf->data + 1;
2853                 l2n3(len - 4, p); /* Message length */
2854                 p += 4;
2855                 s2n(len - 10, p);  /* Ticket length */
2856
2857                 /* number of bytes to write */
2858                 s->init_num= len;
2859                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
2860                 s->init_off=0;
2861                 OPENSSL_free(senc);
2862                 }
2863
2864         /* SSL3_ST_SW_SESSION_TICKET_B */
2865         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2866         }
2867
2868 int ssl3_send_cert_status(SSL *s)
2869         {
2870         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
2871                 {
2872                 unsigned char *p;
2873                 /* Grow buffer if need be: the length calculation is as
2874                  * follows 1 (message type) + 3 (message length) +
2875                  * 1 (ocsp response type) + 3 (ocsp response length)
2876                  * + (ocsp response)
2877                  */
2878                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
2879                         return -1;
2880
2881                 p=(unsigned char *)s->init_buf->data;
2882
2883                 /* do the header */
2884                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
2885                 /* message length */
2886                 l2n3(s->tlsext_ocsp_resplen + 4, p);
2887                 /* status type */
2888                 *(p++)= s->tlsext_status_type;
2889                 /* length of OCSP response */
2890                 l2n3(s->tlsext_ocsp_resplen, p);
2891                 /* actual response */
2892                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
2893                 /* number of bytes to write */
2894                 s->init_num = 8 + s->tlsext_ocsp_resplen;
2895                 s->state=SSL3_ST_SW_CERT_STATUS_B;
2896                 s->init_off = 0;
2897                 }
2898
2899         /* SSL3_ST_SW_CERT_STATUS_B */
2900         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2901         }
2902 #endif