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 "../crypto/constant_time_locl.h"
 132 #include <openssl/buffer.h>
 133 #include <openssl/rand.h>
 134 #include <openssl/objects.h>
 135 #include <openssl/evp.h>
 136 #include <openssl/hmac.h>
 137 #include <openssl/x509.h>
 138 #ifndef OPENSSL_NO_DH
 139 #include <openssl/dh.h>
 140 #endif
 141 #include <openssl/bn.h>
 142 #ifndef OPENSSL_NO_KRB5
 143 #include <openssl/krb5_asn.h>
 144 #endif
 145 #include <openssl/md5.h>
 146
 147 static SSL_METHOD *ssl3_get_server_method(int ver);
 148 #ifndef OPENSSL_NO_ECDH
 149 static int nid2curve_id(int nid);
 150 #endif
 151
 152 static SSL_METHOD *ssl3_get_server_method(int ver)
 153         {
 154         if (ver == SSL3_VERSION)
 155                 return(SSLv3_server_method());
 156         else
 157                 return(NULL);
 158         }
 159
 160 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
 161                         ssl3_accept,
 162                         ssl_undefined_function,
 163                         ssl3_get_server_method)
 164
 165 int ssl3_accept(SSL *s)
 166         {
 167         BUF_MEM *buf;
 168         unsigned long l,Time=(unsigned long)time(NULL);
 169         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 170         int ret= -1;
 171         int new_state,state,skip=0;
 172
 173         RAND_add(&Time,sizeof(Time),0);
 174         ERR_clear_error();
 175         clear_sys_error();
 176
 177         if (s->info_callback != NULL)
 178                 cb=s->info_callback;
 179         else if (s->ctx->info_callback != NULL)
 180                 cb=s->ctx->info_callback;
 181
 182         /* init things to blank */
 183         s->in_handshake++;
 184         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 185
 186         if (s->cert == NULL)
 187                 {
 188                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 189                 return(-1);
 190                 }
 191
 192         for (;;)
 193                 {
 194                 state=s->state;
 195
 196                 switch (s->state)
 197                         {
 198                 case SSL_ST_RENEGOTIATE:
 199                         s->new_session=1;
 200                         /* s->state=SSL_ST_ACCEPT; */
 201
 202                 case SSL_ST_BEFORE:
 203                 case SSL_ST_ACCEPT:
 204                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 205                 case SSL_ST_OK|SSL_ST_ACCEPT:
 206
 207                         s->server=1;
 208                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 209
 210                         if ((s->version>>8) != 3)
 211                                 {
 212                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 213                                 return -1;
 214                                 }
 215                         s->type=SSL_ST_ACCEPT;
 216
 217                         if (s->init_buf == NULL)
 218                                 {
 219                                 if ((buf=BUF_MEM_new()) == NULL)
 220                                         {
 221                                         ret= -1;
 222                                         goto end;
 223                                         }
 224                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 225                                         {
 226                                         ret= -1;
 227                                         goto end;
 228                                         }
 229                                 s->init_buf=buf;
 230                                 }
 231
 232                         if (!ssl3_setup_buffers(s))
 233                                 {
 234                                 ret= -1;
 235                                 goto end;
 236                                 }
 237
 238                         s->init_num=0;
 239                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
 240
 241                         if (s->state != SSL_ST_RENEGOTIATE)
 242                                 {
 243                                 /* Ok, we now need to push on a buffering BIO so that
 244                                  * the output is sent in a way that TCP likes :-)
 245                                  */
 246                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 247
 248                                 ssl3_init_finished_mac(s);
 249                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 250                                 s->ctx->stats.sess_accept++;
 251                                 }
 252                         else if (!s->s3->send_connection_binding &&
 253                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
 254                                 {
 255                                 /* Server attempting to renegotiate with
 256                                  * client that doesn't support secure
 257                                  * renegotiation.
 258                                  */
 259                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
 260                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 261                                 ret = -1;
 262                                 goto end;
 263                                 }
 264                         else
 265                                 {
 266                                 /* s->state == SSL_ST_RENEGOTIATE,
 267                                  * we will just send a HelloRequest */
 268                                 s->ctx->stats.sess_accept_renegotiate++;
 269                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 270                                 }
 271                         break;
 272
 273                 case SSL3_ST_SW_HELLO_REQ_A:
 274                 case SSL3_ST_SW_HELLO_REQ_B:
 275
 276                         s->shutdown=0;
 277                         ret=ssl3_send_hello_request(s);
 278                         if (ret <= 0) goto end;
 279                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 280                         s->state=SSL3_ST_SW_FLUSH;
 281                         s->init_num=0;
 282
 283                         ssl3_init_finished_mac(s);
 284                         break;
 285
 286                 case SSL3_ST_SW_HELLO_REQ_C:
 287                         s->state=SSL_ST_OK;
 288                         break;
 289
 290                 case SSL3_ST_SR_CLNT_HELLO_A:
 291                 case SSL3_ST_SR_CLNT_HELLO_B:
 292                 case SSL3_ST_SR_CLNT_HELLO_C:
 293
 294                         s->shutdown=0;
 295                         ret=ssl3_get_client_hello(s);
 296                         if (ret <= 0) goto end;
 297                         s->new_session = 2;
 298                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 299                         s->init_num=0;
 300                         break;
 301
 302                 case SSL3_ST_SW_SRVR_HELLO_A:
 303                 case SSL3_ST_SW_SRVR_HELLO_B:
 304                         ret=ssl3_send_server_hello(s);
 305                         if (ret <= 0) goto end;
 306 #ifndef OPENSSL_NO_TLSEXT
 307                         if (s->hit)
 308                                 {
 309                                 if (s->tlsext_ticket_expected)
 310                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 311                                 else
 312                                         s->state=SSL3_ST_SW_CHANGE_A;
 313                                 }
 314 #else
 315                         if (s->hit)
 316                                         s->state=SSL3_ST_SW_CHANGE_A;
 317 #endif
 318                         else
 319                                 s->state=SSL3_ST_SW_CERT_A;
 320                         s->init_num=0;
 321                         break;
 322
 323                 case SSL3_ST_SW_CERT_A:
 324                 case SSL3_ST_SW_CERT_B:
 325                         /* Check if it is anon DH or anon ECDH or KRB5 */
 326                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)
 327                                 && !(s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 328                                 {
 329                                 ret=ssl3_send_server_certificate(s);
 330                                 if (ret <= 0) goto end;
 331 #ifndef OPENSSL_NO_TLSEXT
 332                                 if (s->tlsext_status_expected)
 333                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 334                                 else
 335                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 336                                 }
 337                         else
 338                                 {
 339                                 skip = 1;
 340                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 341                                 }
 342 #else
 343                                 }
 344                         else
 345                                 skip=1;
 346
 347                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 348 #endif
 349                         s->init_num=0;
 350                         break;
 351
 352                 case SSL3_ST_SW_KEY_EXCH_A:
 353                 case SSL3_ST_SW_KEY_EXCH_B:
 354                         l=s->s3->tmp.new_cipher->algorithms;
 355
 356                         /* clear this, it may get reset by
 357                          * send_server_key_exchange */
 358                         s->s3->tmp.use_rsa_tmp=0;
 359
 360
 361                         /* only send if a DH key exchange, fortezza or
 362                          * RSA but we have a sign only certificate
 363                          *
 364                          * For ECC ciphersuites, we send a serverKeyExchange
 365                          * message only if the cipher suite is either
 366                          * ECDH-anon or ECDHE. In other cases, the
 367                          * server certificate contains the server's
 368                          * public key for key exchange.
 369                          */
 370                         if ((l & SSL_kECDHE)
 371                             || (l & (SSL_DH|SSL_kFZA))
 372                             || ((l & SSL_kRSA)
 373                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 374                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 375                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 376                                         )
 377                                     )
 378                                 )
 379                             )
 380                                 {
 381                                 ret=ssl3_send_server_key_exchange(s);
 382                                 if (ret <= 0) goto end;
 383                                 }
 384                         else
 385                                 skip=1;
 386
 387                         s->state=SSL3_ST_SW_CERT_REQ_A;
 388                         s->init_num=0;
 389                         break;
 390
 391                 case SSL3_ST_SW_CERT_REQ_A:
 392                 case SSL3_ST_SW_CERT_REQ_B:
 393                         if (/* don't request cert unless asked for it: */
 394                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 395                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 396                                  * don't request cert during re-negotiation: */
 397                                 ((s->session->peer != NULL) &&
 398                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 399                                 /* never request cert in anonymous ciphersuites
 400                                  * (see section "Certificate request" in SSL 3 drafts
 401                                  * and in RFC 2246): */
 402                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 403                                  /* ... except when the application insists on verification
 404                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 405                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 406                                  /* never request cert in Kerberos ciphersuites */
 407                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 408                                 {
 409                                 /* no cert request */
 410                                 skip=1;
 411                                 s->s3->tmp.cert_request=0;
 412                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 413                                 }
 414                         else
 415                                 {
 416                                 s->s3->tmp.cert_request=1;
 417                                 ret=ssl3_send_certificate_request(s);
 418                                 if (ret <= 0) goto end;
 419 #ifndef NETSCAPE_HANG_BUG
 420                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 421 #else
 422                                 s->state=SSL3_ST_SW_FLUSH;
 423                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 424 #endif
 425                                 s->init_num=0;
 426                                 }
 427                         break;
 428
 429                 case SSL3_ST_SW_SRVR_DONE_A:
 430                 case SSL3_ST_SW_SRVR_DONE_B:
 431                         ret=ssl3_send_server_done(s);
 432                         if (ret <= 0) goto end;
 433                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 434                         s->state=SSL3_ST_SW_FLUSH;
 435                         s->init_num=0;
 436                         break;
 437
 438                 case SSL3_ST_SW_FLUSH:
 439
 440                         /* This code originally checked to see if
 441                          * any data was pending using BIO_CTRL_INFO
 442                          * and then flushed. This caused problems
 443                          * as documented in PR#1939. The proposed
 444                          * fix doesn't completely resolve this issue
 445                          * as buggy implementations of BIO_CTRL_PENDING
 446                          * still exist. So instead we just flush
 447                          * unconditionally.
 448                          */
 449
 450                         s->rwstate=SSL_WRITING;
 451                         if (BIO_flush(s->wbio) <= 0)
 452                                 {
 453                                 ret= -1;
 454                                 goto end;
 455                                 }
 456                         s->rwstate=SSL_NOTHING;
 457
 458                         s->state=s->s3->tmp.next_state;
 459                         break;
 460
 461                 case SSL3_ST_SR_CERT_A:
 462                 case SSL3_ST_SR_CERT_B:
 463                         /* Check for second client hello (MS SGC) */
 464                         ret = ssl3_check_client_hello(s);
 465                         if (ret <= 0)
 466                                 goto end;
 467                         if (ret == 2)
 468                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 469                         else {
 470                                 if (s->s3->tmp.cert_request)
 471                                         {
 472                                         ret=ssl3_get_client_certificate(s);
 473                                         if (ret <= 0) goto end;
 474                                         }
 475                                 s->init_num=0;
 476                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 477                         }
 478                         break;
 479
 480                 case SSL3_ST_SR_KEY_EXCH_A:
 481                 case SSL3_ST_SR_KEY_EXCH_B:
 482                         ret=ssl3_get_client_key_exchange(s);
 483                         if (ret <= 0)
 484                                 goto end;
 485                         if (ret == 2)
 486                                 {
 487                                 /* For the ECDH ciphersuites when
 488                                  * the client sends its ECDH pub key in
 489                                  * a certificate, the CertificateVerify
 490                                  * message is not sent.
 491                                  */
 492                                 s->state=SSL3_ST_SR_FINISHED_A;
 493                                 s->init_num = 0;
 494                                 }
 495                         else
 496                                 {
 497                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 498                                 s->init_num=0;
 499
 500                                 /* We need to get hashes here so if there is
 501                                  * a client cert, it can be verified
 502                                  */
 503                                 s->method->ssl3_enc->cert_verify_mac(s,
 504                                     &(s->s3->finish_dgst1),
 505                                     &(s->s3->tmp.cert_verify_md[0]));
 506                                 s->method->ssl3_enc->cert_verify_mac(s,
 507                                     &(s->s3->finish_dgst2),
 508                                     &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 509                                 }
 510                         break;
 511
 512                 case SSL3_ST_SR_CERT_VRFY_A:
 513                 case SSL3_ST_SR_CERT_VRFY_B:
 514
 515                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 516                         /* we should decide if we expected this one */
 517                         ret=ssl3_get_cert_verify(s);
 518                         if (ret <= 0) goto end;
 519
 520                         s->state=SSL3_ST_SR_FINISHED_A;
 521                         s->init_num=0;
 522                         break;
 523
 524                 case SSL3_ST_SR_FINISHED_A:
 525                 case SSL3_ST_SR_FINISHED_B:
 526                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 527                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 528                                 SSL3_ST_SR_FINISHED_B);
 529                         if (ret <= 0) goto end;
 530                         if (s->hit)
 531                                 s->state=SSL_ST_OK;
 532 #ifndef OPENSSL_NO_TLSEXT
 533                         else if (s->tlsext_ticket_expected)
 534                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 535 #endif
 536                         else
 537                                 s->state=SSL3_ST_SW_CHANGE_A;
 538                         s->init_num=0;
 539                         break;
 540
 541 #ifndef OPENSSL_NO_TLSEXT
 542                 case SSL3_ST_SW_SESSION_TICKET_A:
 543                 case SSL3_ST_SW_SESSION_TICKET_B:
 544                         ret=ssl3_send_newsession_ticket(s);
 545                         if (ret <= 0) goto end;
 546                         s->state=SSL3_ST_SW_CHANGE_A;
 547                         s->init_num=0;
 548                         break;
 549
 550                 case SSL3_ST_SW_CERT_STATUS_A:
 551                 case SSL3_ST_SW_CERT_STATUS_B:
 552                         ret=ssl3_send_cert_status(s);
 553                         if (ret <= 0) goto end;
 554                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 555                         s->init_num=0;
 556                         break;
 557
 558 #endif
 559
 560                 case SSL3_ST_SW_CHANGE_A:
 561                 case SSL3_ST_SW_CHANGE_B:
 562
 563                         s->session->cipher=s->s3->tmp.new_cipher;
 564                         if (!s->method->ssl3_enc->setup_key_block(s))
 565                                 { ret= -1; goto end; }
 566
 567                         ret=ssl3_send_change_cipher_spec(s,
 568                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 569
 570                         if (ret <= 0) goto end;
 571                         s->state=SSL3_ST_SW_FINISHED_A;
 572                         s->init_num=0;
 573
 574                         if (!s->method->ssl3_enc->change_cipher_state(s,
 575                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 576                                 {
 577                                 ret= -1;
 578                                 goto end;
 579                                 }
 580
 581                         break;
 582
 583                 case SSL3_ST_SW_FINISHED_A:
 584                 case SSL3_ST_SW_FINISHED_B:
 585                         ret=ssl3_send_finished(s,
 586                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 587                                 s->method->ssl3_enc->server_finished_label,
 588                                 s->method->ssl3_enc->server_finished_label_len);
 589                         if (ret <= 0) goto end;
 590                         s->state=SSL3_ST_SW_FLUSH;
 591                         if (s->hit)
 592                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 593                         else
 594                                 s->s3->tmp.next_state=SSL_ST_OK;
 595                         s->init_num=0;
 596                         break;
 597
 598                 case SSL_ST_OK:
 599                         /* clean a few things up */
 600                         ssl3_cleanup_key_block(s);
 601
 602                         BUF_MEM_free(s->init_buf);
 603                         s->init_buf=NULL;
 604
 605                         /* remove buffering on output */
 606                         ssl_free_wbio_buffer(s);
 607
 608                         s->init_num=0;
 609
 610                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 611                                 {
 612                                 /* actually not necessarily a 'new' session unless
 613                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 614
 615                                 s->new_session=0;
 616
 617                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 618
 619                                 s->ctx->stats.sess_accept_good++;
 620                                 /* s->server=1; */
 621                                 s->handshake_func=ssl3_accept;
 622
 623                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 624                                 }
 625
 626                         ret = 1;
 627                         goto end;
 628                         /* break; */
 629
 630                 default:
 631                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 632                         ret= -1;
 633                         goto end;
 634                         /* break; */
 635                         }
 636
 637                 if (!s->s3->tmp.reuse_message && !skip)
 638                         {
 639                         if (s->debug)
 640                                 {
 641                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 642                                         goto end;
 643                                 }
 644
 645
 646                         if ((cb != NULL) && (s->state != state))
 647                                 {
 648                                 new_state=s->state;
 649                                 s->state=state;
 650                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 651                                 s->state=new_state;
 652                                 }
 653                         }
 654                 skip=0;
 655                 }
 656 end:
 657         /* BIO_flush(s->wbio); */
 658
 659         s->in_handshake--;
 660         if (cb != NULL)
 661                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 662         return(ret);
 663         }
 664
 665 int ssl3_send_hello_request(SSL *s)
 666         {
 667         unsigned char *p;
 668
 669         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 670                 {
 671                 p=(unsigned char *)s->init_buf->data;
 672                 *(p++)=SSL3_MT_HELLO_REQUEST;
 673                 *(p++)=0;
 674                 *(p++)=0;
 675                 *(p++)=0;
 676
 677                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 678                 /* number of bytes to write */
 679                 s->init_num=4;
 680                 s->init_off=0;
 681                 }
 682
 683         /* SSL3_ST_SW_HELLO_REQ_B */
 684         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 685         }
 686
 687 int ssl3_check_client_hello(SSL *s)
 688         {
 689         int ok;
 690         long n;
 691
 692         /* this function is called when we really expect a Certificate message,
 693          * so permit appropriate message length */
 694         n=s->method->ssl_get_message(s,
 695                 SSL3_ST_SR_CERT_A,
 696                 SSL3_ST_SR_CERT_B,
 697                 -1,
 698                 s->max_cert_list,
 699                 &ok);
 700         if (!ok) return((int)n);
 701         s->s3->tmp.reuse_message = 1;
 702         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 703                 {
 704                 /* We only allow the client to restart the handshake once per
 705                  * negotiation. */
 706                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
 707                         {
 708                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
 709                         return -1;
 710                         }
 711                 /* Throw away what we have done so far in the current handshake,
 712                  * which will now be aborted. (A full SSL_clear would be too much.) */
 713 #ifndef OPENSSL_NO_DH
 714                 if (s->s3->tmp.dh != NULL)
 715                         {
 716                         DH_free(s->s3->tmp.dh);
 717                         s->s3->tmp.dh = NULL;
 718                         }
 719 #endif
 720 #ifndef OPENSSL_NO_ECDH
 721                 if (s->s3->tmp.ecdh != NULL)
 722                         {
 723                         EC_KEY_free(s->s3->tmp.ecdh);
 724                         s->s3->tmp.ecdh = NULL;
 725                         }
 726 #endif
 727                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
 728                 return 2;
 729                 }
 730         return 1;
 731 }
 732
 733 int ssl3_get_client_hello(SSL *s)
 734         {
 735         int i,j,ok,al,ret= -1;
 736         unsigned int cookie_len;
 737         long n;
 738         unsigned long id;
 739         unsigned char *p,*d,*q;
 740         SSL_CIPHER *c;
 741 #ifndef OPENSSL_NO_COMP
 742         SSL_COMP *comp=NULL;
 743 #endif
 744         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 745
 746         /* We do this so that we will respond with our native type.
 747          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 748          * This down switching should be handled by a different method.
 749          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 750          * TLSv1.
 751          */
 752         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 753                 {
 754                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 755                 }
 756         s->first_packet=1;
 757         n=s->method->ssl_get_message(s,
 758                 SSL3_ST_SR_CLNT_HELLO_B,
 759                 SSL3_ST_SR_CLNT_HELLO_C,
 760                 SSL3_MT_CLIENT_HELLO,
 761                 SSL3_RT_MAX_PLAIN_LENGTH,
 762                 &ok);
 763
 764         if (!ok) return((int)n);
 765         s->first_packet=0;
 766         d=p=(unsigned char *)s->init_msg;
 767
 768         /* use version from inside client hello, not from record header
 769          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 770         s->client_version=(((int)p[0])<<8)|(int)p[1];
 771         p+=2;
 772
 773         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 774             (s->version != DTLS1_VERSION && s->client_version < s->version))
 775                 {
 776                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 777                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 778                         {
 779                         /* similar to ssl3_get_record, send alert using remote version number */
 780                         s->version = s->client_version;
 781                         }
 782                 al = SSL_AD_PROTOCOL_VERSION;
 783                 goto f_err;
 784                 }
 785
 786         /* If we require cookies and this ClientHello doesn't
 787          * contain one, just return since we do not want to
 788          * allocate any memory yet. So check cookie length...
 789          */
 790         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
 791                 {
 792                 unsigned int session_length, cookie_length;
 793
 794                 session_length = *(p + SSL3_RANDOM_SIZE);
 795                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
 796
 797                 if (cookie_length == 0)
 798                         return 1;
 799                 }
 800
 801         /* load the client random */
 802         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 803         p+=SSL3_RANDOM_SIZE;
 804
 805         /* get the session-id */
 806         j= *(p++);
 807
 808         s->hit=0;
 809         /* Versions before 0.9.7 always allow session reuse during renegotiation
 810          * (i.e. when s->new_session is true), option
 811          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
 812          * Maybe this optional behaviour should always have been the default,
 813          * but we cannot safely change the default behaviour (or new applications
 814          * might be written that become totally unsecure when compiled with
 815          * an earlier library version)
 816          */
 817         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 818                 {
 819                 if (!ssl_get_new_session(s,1))
 820                         goto err;
 821                 }
 822         else
 823                 {
 824                 i=ssl_get_prev_session(s, p, j, d + n);
 825                 if (i == 1)
 826                         { /* previous session */
 827                         s->hit=1;
 828                         }
 829                 else if (i == -1)
 830                         goto err;
 831                 else /* i == 0 */
 832                         {
 833                         if (!ssl_get_new_session(s,1))
 834                                 goto err;
 835                         }
 836                 }
 837
 838         p+=j;
 839
 840         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
 841                 {
 842                 /* cookie stuff */
 843                 cookie_len = *(p++);
 844
 845                 /*
 846                  * The ClientHello may contain a cookie even if the
 847                  * HelloVerify message has not been sent--make sure that it
 848                  * does not cause an overflow.
 849                  */
 850                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
 851                         {
 852                         /* too much data */
 853                         al = SSL_AD_DECODE_ERROR;
 854                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 855                         goto f_err;
 856                         }
 857
 858                 /* verify the cookie if appropriate option is set. */
 859                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 860                         cookie_len > 0)
 861                         {
 862                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
 863
 864                         if ( s->ctx->app_verify_cookie_cb != NULL)
 865                                 {
 866                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
 867                                         cookie_len) == 0)
 868                                         {
 869                                         al=SSL_AD_HANDSHAKE_FAILURE;
 870                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 871                                                 SSL_R_COOKIE_MISMATCH);
 872                                         goto f_err;
 873                                         }
 874                                 /* else cookie verification succeeded */
 875                                 }
 876                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
 877                                                   s->d1->cookie_len) != 0) /* default verification */
 878                                 {
 879                                         al=SSL_AD_HANDSHAKE_FAILURE;
 880                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 881                                                 SSL_R_COOKIE_MISMATCH);
 882                                         goto f_err;
 883                                 }
 884
 885                         ret = 2;
 886                         }
 887
 888                 p += cookie_len;
 889                 }
 890
 891         n2s(p,i);
 892         if ((i == 0) && (j != 0))
 893                 {
 894                 /* we need a cipher if we are not resuming a session */
 895                 al=SSL_AD_ILLEGAL_PARAMETER;
 896                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 897                 goto f_err;
 898                 }
 899         if ((p+i) >= (d+n))
 900                 {
 901                 /* not enough data */
 902                 al=SSL_AD_DECODE_ERROR;
 903                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 904                 goto f_err;
 905                 }
 906         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 907                 == NULL))
 908                 {
 909                 goto err;
 910                 }
 911         p+=i;
 912
 913         /* If it is a hit, check that the cipher is in the list */
 914         if ((s->hit) && (i > 0))
 915                 {
 916                 j=0;
 917                 id=s->session->cipher->id;
 918
 919 #ifdef CIPHER_DEBUG
 920                 printf("client sent %d ciphers\n",sk_num(ciphers));
 921 #endif
 922                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 923                         {
 924                         c=sk_SSL_CIPHER_value(ciphers,i);
 925 #ifdef CIPHER_DEBUG
 926                         printf("client [%2d of %2d]:%s\n",
 927                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 928 #endif
 929                         if (c->id == id)
 930                                 {
 931                                 j=1;
 932                                 break;
 933                                 }
 934                         }
 935 /* Disabled because it can be used in a ciphersuite downgrade
 936  * attack: CVE-2010-4180.
 937  */
 938 #if 0
 939                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 940                         {
 941                         /* Special case as client bug workaround: the previously used cipher may
 942                          * not be in the current list, the client instead might be trying to
 943                          * continue using a cipher that before wasn't chosen due to server
 944                          * preferences.  We'll have to reject the connection if the cipher is not
 945                          * enabled, though. */
 946                         c = sk_SSL_CIPHER_value(ciphers, 0);
 947                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
 948                                 {
 949                                 s->session->cipher = c;
 950                                 j = 1;
 951                                 }
 952                         }
 953 #endif
 954                 if (j == 0)
 955                         {
 956                         /* we need to have the cipher in the cipher
 957                          * list if we are asked to reuse it */
 958                         al=SSL_AD_ILLEGAL_PARAMETER;
 959                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 960                         goto f_err;
 961                         }
 962                 }
 963
 964         /* compression */
 965         i= *(p++);
 966         if ((p+i) > (d+n))
 967                 {
 968                 /* not enough data */
 969                 al=SSL_AD_DECODE_ERROR;
 970                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 971                 goto f_err;
 972                 }
 973         q=p;
 974         for (j=0; j<i; j++)
 975                 {
 976                 if (p[j] == 0) break;
 977                 }
 978
 979         p+=i;
 980         if (j >= i)
 981                 {
 982                 /* no compress */
 983                 al=SSL_AD_DECODE_ERROR;
 984                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 985                 goto f_err;
 986                 }
 987
 988 #ifndef OPENSSL_NO_TLSEXT
 989         /* TLS extensions*/
 990         if (s->version >= SSL3_VERSION)
 991                 {
 992                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
 993                         {
 994                         /* 'al' set by ssl_parse_clienthello_tlsext */
 995                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
 996                         goto f_err;
 997                         }
 998                 }
 999                 if (ssl_check_clienthello_tlsext_early(s) <= 0) {
1000                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1001                         goto err;
1002                 }
1003 #endif
1004         /* Worst case, we will use the NULL compression, but if we have other
1005          * options, we will now look for them.  We have i-1 compression
1006          * algorithms from the client, starting at q. */
1007         s->s3->tmp.new_compression=NULL;
1008 #ifndef OPENSSL_NO_COMP
1009         if (s->ctx->comp_methods != NULL)
1010                 { /* See if we have a match */
1011                 int m,nn,o,v,done=0;
1012
1013                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1014                 for (m=0; m<nn; m++)
1015                         {
1016                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1017                         v=comp->id;
1018                         for (o=0; o<i; o++)
1019                                 {
1020                                 if (v == q[o])
1021                                         {
1022                                         done=1;
1023                                         break;
1024                                         }
1025                                 }
1026                         if (done) break;
1027                         }
1028                 if (done)
1029                         s->s3->tmp.new_compression=comp;
1030                 else
1031                         comp=NULL;
1032                 }
1033 #endif
1034
1035         /* TLS does not mind if there is extra stuff */
1036 #if 0   /* SSL 3.0 does not mind either, so we should disable this test
1037          * (was enabled in 0.9.6d through 0.9.6j and 0.9.7 through 0.9.7b,
1038          * in earlier SSLeay/OpenSSL releases this test existed but was buggy) */
1039         if (s->version == SSL3_VERSION)
1040                 {
1041                 if (p < (d+n))
1042                         {
1043                         /* wrong number of bytes,
1044                          * there could be more to follow */
1045                         al=SSL_AD_DECODE_ERROR;
1046                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1047                         goto f_err;
1048                         }
1049                 }
1050 #endif
1051
1052         /* Given s->session->ciphers and SSL_get_ciphers, we must
1053          * pick a cipher */
1054
1055         if (!s->hit)
1056                 {
1057 #ifdef OPENSSL_NO_COMP
1058                 s->session->compress_meth=0;
1059 #else
1060                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1061 #endif
1062                 if (s->session->ciphers != NULL)
1063                         sk_SSL_CIPHER_free(s->session->ciphers);
1064                 s->session->ciphers=ciphers;
1065                 if (ciphers == NULL)
1066                         {
1067                         al=SSL_AD_ILLEGAL_PARAMETER;
1068                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1069                         goto f_err;
1070                         }
1071                 ciphers=NULL;
1072                 c=ssl3_choose_cipher(s,s->session->ciphers,
1073                                      SSL_get_ciphers(s));
1074
1075                 if (c == NULL)
1076                         {
1077                         al=SSL_AD_HANDSHAKE_FAILURE;
1078                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1079                         goto f_err;
1080                         }
1081                 s->s3->tmp.new_cipher=c;
1082                 }
1083         else
1084                 {
1085                 /* Session-id reuse */
1086 #ifdef REUSE_CIPHER_BUG
1087                 STACK_OF(SSL_CIPHER) *sk;
1088                 SSL_CIPHER *nc=NULL;
1089                 SSL_CIPHER *ec=NULL;
1090
1091                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1092                         {
1093                         sk=s->session->ciphers;
1094                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1095                                 {
1096                                 c=sk_SSL_CIPHER_value(sk,i);
1097                                 if (c->algorithms & SSL_eNULL)
1098                                         nc=c;
1099                                 if (SSL_C_IS_EXPORT(c))
1100                                         ec=c;
1101                                 }
1102                         if (nc != NULL)
1103                                 s->s3->tmp.new_cipher=nc;
1104                         else if (ec != NULL)
1105                                 s->s3->tmp.new_cipher=ec;
1106                         else
1107                                 s->s3->tmp.new_cipher=s->session->cipher;
1108                         }
1109                 else
1110 #endif
1111                 s->s3->tmp.new_cipher=s->session->cipher;
1112                 }
1113
1114         /* we now have the following setup.
1115          * client_random
1116          * cipher_list          - our prefered list of ciphers
1117          * ciphers              - the clients prefered list of ciphers
1118          * compression          - basically ignored right now
1119          * ssl version is set   - sslv3
1120          * s->session           - The ssl session has been setup.
1121          * s->hit               - session reuse flag
1122          * s->tmp.new_cipher    - the new cipher to use.
1123          */
1124
1125 #ifndef OPENSSL_NO_TLSEXT
1126         /* Handles TLS extensions that we couldn't check earlier */
1127         if (s->version >= SSL3_VERSION)
1128                 {
1129                 if (ssl_check_clienthello_tlsext_late(s) <= 0)
1130                         {
1131                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1132                         goto err;
1133                         }
1134                 }
1135 #endif
1136
1137         if (ret < 0) ret=1;
1138         if (0)
1139                 {
1140 f_err:
1141                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1142                 }
1143 err:
1144         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1145         return(ret);
1146         }
1147
1148 int ssl3_send_server_hello(SSL *s)
1149         {
1150         unsigned char *buf;
1151         unsigned char *p,*d;
1152         int i,sl;
1153         unsigned long l,Time;
1154
1155         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1156                 {
1157                 buf=(unsigned char *)s->init_buf->data;
1158                 p=s->s3->server_random;
1159                 Time=(unsigned long)time(NULL);                 /* Time */
1160                 l2n(Time,p);
1161                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1162                         return -1;
1163                 /* Do the message type and length last */
1164                 d=p= &(buf[4]);
1165
1166                 *(p++)=s->version>>8;
1167                 *(p++)=s->version&0xff;
1168
1169                 /* Random stuff */
1170                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1171                 p+=SSL3_RANDOM_SIZE;
1172
1173                 /* now in theory we have 3 options to sending back the
1174                  * session id.  If it is a re-use, we send back the
1175                  * old session-id, if it is a new session, we send
1176                  * back the new session-id or we send back a 0 length
1177                  * session-id if we want it to be single use.
1178                  * Currently I will not implement the '0' length session-id
1179                  * 12-Jan-98 - I'll now support the '0' length stuff.
1180                  *
1181                  * We also have an additional case where stateless session
1182                  * resumption is successful: we always send back the old
1183                  * session id. In this case s->hit is non zero: this can
1184                  * only happen if stateless session resumption is succesful
1185                  * if session caching is disabled so existing functionality
1186                  * is unaffected.
1187                  */
1188                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1189                         && !s->hit)
1190                         s->session->session_id_length=0;
1191
1192                 sl=s->session->session_id_length;
1193                 if (sl > (int)sizeof(s->session->session_id))
1194                         {
1195                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1196                         return -1;
1197                         }
1198                 *(p++)=sl;
1199                 memcpy(p,s->session->session_id,sl);
1200                 p+=sl;
1201
1202                 /* put the cipher */
1203                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1204                 p+=i;
1205
1206                 /* put the compression method */
1207 #ifdef OPENSSL_NO_COMP
1208                         *(p++)=0;
1209 #else
1210                 if (s->s3->tmp.new_compression == NULL)
1211                         *(p++)=0;
1212                 else
1213                         *(p++)=s->s3->tmp.new_compression->id;
1214 #endif
1215 #ifndef OPENSSL_NO_TLSEXT
1216                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1217                         {
1218                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1219                         return -1;
1220                         }
1221 #endif
1222                 /* do the header */
1223                 l=(p-d);
1224                 d=buf;
1225                 *(d++)=SSL3_MT_SERVER_HELLO;
1226                 l2n3(l,d);
1227
1228                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1229                 /* number of bytes to write */
1230                 s->init_num=p-buf;
1231                 s->init_off=0;
1232                 }
1233
1234         /* SSL3_ST_SW_SRVR_HELLO_B */
1235         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1236         }
1237
1238 int ssl3_send_server_done(SSL *s)
1239         {
1240         unsigned char *p;
1241
1242         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1243                 {
1244                 p=(unsigned char *)s->init_buf->data;
1245
1246                 /* do the header */
1247                 *(p++)=SSL3_MT_SERVER_DONE;
1248                 *(p++)=0;
1249                 *(p++)=0;
1250                 *(p++)=0;
1251
1252                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1253                 /* number of bytes to write */
1254                 s->init_num=4;
1255                 s->init_off=0;
1256                 }
1257
1258         /* SSL3_ST_SW_SRVR_DONE_B */
1259         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1260         }
1261
1262 int ssl3_send_server_key_exchange(SSL *s)
1263         {
1264 #ifndef OPENSSL_NO_RSA
1265         unsigned char *q;
1266         int j,num;
1267         RSA *rsa;
1268         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1269         unsigned int u;
1270 #endif
1271 #ifndef OPENSSL_NO_DH
1272         DH *dh=NULL,*dhp;
1273 #endif
1274 #ifndef OPENSSL_NO_ECDH
1275         EC_KEY *ecdh=NULL, *ecdhp;
1276         unsigned char *encodedPoint = NULL;
1277         int encodedlen = 0;
1278         int curve_id = 0;
1279         BN_CTX *bn_ctx = NULL;
1280 #endif
1281         EVP_PKEY *pkey;
1282         unsigned char *p,*d;
1283         int al,i;
1284         unsigned long type;
1285         int n;
1286         CERT *cert;
1287         BIGNUM *r[4];
1288         int nr[4],kn;
1289         BUF_MEM *buf;
1290         EVP_MD_CTX md_ctx;
1291
1292         EVP_MD_CTX_init(&md_ctx);
1293         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1294                 {
1295                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1296                 cert=s->cert;
1297
1298                 buf=s->init_buf;
1299
1300                 r[0]=r[1]=r[2]=r[3]=NULL;
1301                 n=0;
1302 #ifndef OPENSSL_NO_RSA
1303                 if (type & SSL_kRSA)
1304                         {
1305                         rsa=cert->rsa_tmp;
1306                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1307                                 {
1308                                 rsa=s->cert->rsa_tmp_cb(s,
1309                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1310                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1311                                 if(rsa == NULL)
1312                                 {
1313                                         al=SSL_AD_HANDSHAKE_FAILURE;
1314                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1315                                         goto f_err;
1316                                 }
1317                                 RSA_up_ref(rsa);
1318                                 cert->rsa_tmp=rsa;
1319                                 }
1320                         if (rsa == NULL)
1321                                 {
1322                                 al=SSL_AD_HANDSHAKE_FAILURE;
1323                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1324                                 goto f_err;
1325                                 }
1326                         r[0]=rsa->n;
1327                         r[1]=rsa->e;
1328                         s->s3->tmp.use_rsa_tmp=1;
1329                         }
1330                 else
1331 #endif
1332 #ifndef OPENSSL_NO_DH
1333                         if (type & SSL_kEDH)
1334                         {
1335                         dhp=cert->dh_tmp;
1336                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1337                                 dhp=s->cert->dh_tmp_cb(s,
1338                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1339                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1340                         if (dhp == NULL)
1341                                 {
1342                                 al=SSL_AD_HANDSHAKE_FAILURE;
1343                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1344                                 goto f_err;
1345                                 }
1346
1347                         if (s->s3->tmp.dh != NULL)
1348                                 {
1349                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1350                                 goto err;
1351                                 }
1352
1353                         if ((dh=DHparams_dup(dhp)) == NULL)
1354                                 {
1355                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1356                                 goto err;
1357                                 }
1358
1359                         s->s3->tmp.dh=dh;
1360                         if ((dhp->pub_key == NULL ||
1361                              dhp->priv_key == NULL ||
1362                              (s->options & SSL_OP_SINGLE_DH_USE)))
1363                                 {
1364                                 if(!DH_generate_key(dh))
1365                                     {
1366                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1367                                            ERR_R_DH_LIB);
1368                                     goto err;
1369                                     }
1370                                 }
1371                         else
1372                                 {
1373                                 dh->pub_key=BN_dup(dhp->pub_key);
1374                                 dh->priv_key=BN_dup(dhp->priv_key);
1375                                 if ((dh->pub_key == NULL) ||
1376                                         (dh->priv_key == NULL))
1377                                         {
1378                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1379                                         goto err;
1380                                         }
1381                                 }
1382                         r[0]=dh->p;
1383                         r[1]=dh->g;
1384                         r[2]=dh->pub_key;
1385                         }
1386                 else
1387 #endif
1388 #ifndef OPENSSL_NO_ECDH
1389                         if (type & SSL_kECDHE)
1390                         {
1391                         const EC_GROUP *group;
1392
1393                         ecdhp=cert->ecdh_tmp;
1394                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1395                                 {
1396                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1397                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1398                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1399                                 }
1400                         if (ecdhp == NULL)
1401                                 {
1402                                 al=SSL_AD_HANDSHAKE_FAILURE;
1403                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1404                                 goto f_err;
1405                                 }
1406
1407                         if (s->s3->tmp.ecdh != NULL)
1408                                 {
1409                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1410                                 goto err;
1411                                 }
1412
1413                         /* Duplicate the ECDH structure. */
1414                         if (ecdhp == NULL)
1415                                 {
1416                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1417                                 goto err;
1418                                 }
1419                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1420                                 {
1421                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1422                                 goto err;
1423                                 }
1424
1425                         s->s3->tmp.ecdh=ecdh;
1426                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1427                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1428                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1429                                 {
1430                                 if(!EC_KEY_generate_key(ecdh))
1431                                     {
1432                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1433                                     goto err;
1434                                     }
1435                                 }
1436
1437                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1438                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1439                             (EC_KEY_get0_private_key(ecdh) == NULL))
1440                                 {
1441                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1442                                 goto err;
1443                                 }
1444
1445                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1446                             (EC_GROUP_get_degree(group) > 163))
1447                                 {
1448                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1449                                 goto err;
1450                                 }
1451
1452                         /* XXX: For now, we only support ephemeral ECDH
1453                          * keys over named (not generic) curves. For
1454                          * supported named curves, curve_id is non-zero.
1455                          */
1456                         if ((curve_id =
1457                             nid2curve_id(EC_GROUP_get_curve_name(group)))
1458                             == 0)
1459                                 {
1460                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1461                                 goto err;
1462                                 }
1463
1464                         /* Encode the public key.
1465                          * First check the size of encoding and
1466                          * allocate memory accordingly.
1467                          */
1468                         encodedlen = EC_POINT_point2oct(group,
1469                             EC_KEY_get0_public_key(ecdh),
1470                             POINT_CONVERSION_UNCOMPRESSED,
1471                             NULL, 0, NULL);
1472
1473                         encodedPoint = (unsigned char *)
1474                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1475                         bn_ctx = BN_CTX_new();
1476                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1477                                 {
1478                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1479                                 goto err;
1480                                 }
1481
1482
1483                         encodedlen = EC_POINT_point2oct(group,
1484                             EC_KEY_get0_public_key(ecdh),
1485                             POINT_CONVERSION_UNCOMPRESSED,
1486                             encodedPoint, encodedlen, bn_ctx);
1487
1488                         if (encodedlen == 0)
1489                                 {
1490                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1491                                 goto err;
1492                                 }
1493
1494                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1495
1496                         /* XXX: For now, we only support named (not
1497                          * generic) curves in ECDH ephemeral key exchanges.
1498                          * In this situation, we need four additional bytes
1499                          * to encode the entire ServerECDHParams
1500                          * structure.
1501                          */
1502                         n = 4 + encodedlen;
1503
1504                         /* We'll generate the serverKeyExchange message
1505                          * explicitly so we can set these to NULLs
1506                          */
1507                         r[0]=NULL;
1508                         r[1]=NULL;
1509                         r[2]=NULL;
1510                         r[3]=NULL;
1511                         }
1512                 else
1513 #endif /* !OPENSSL_NO_ECDH */
1514                         {
1515                         al=SSL_AD_HANDSHAKE_FAILURE;
1516                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1517                         goto f_err;
1518                         }
1519                 for (i=0; r[i] != NULL; i++)
1520                         {
1521                         nr[i]=BN_num_bytes(r[i]);
1522                         n+=2+nr[i];
1523                         }
1524
1525                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1526                         {
1527                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1528                                 == NULL)
1529                                 {
1530                                 al=SSL_AD_DECODE_ERROR;
1531                                 goto f_err;
1532                                 }
1533                         kn=EVP_PKEY_size(pkey);
1534                         }
1535                 else
1536                         {
1537                         pkey=NULL;
1538                         kn=0;
1539                         }
1540
1541                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1542                         {
1543                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1544                         goto err;
1545                         }
1546                 d=(unsigned char *)s->init_buf->data;
1547                 p= &(d[4]);
1548
1549                 for (i=0; r[i] != NULL; i++)
1550                         {
1551                         s2n(nr[i],p);
1552                         BN_bn2bin(r[i],p);
1553                         p+=nr[i];
1554                         }
1555
1556 #ifndef OPENSSL_NO_ECDH
1557                 if (type & SSL_kECDHE)
1558                         {
1559                         /* XXX: For now, we only support named (not generic) curves.
1560                          * In this situation, the serverKeyExchange message has:
1561                          * [1 byte CurveType], [2 byte CurveName]
1562                          * [1 byte length of encoded point], followed by
1563                          * the actual encoded point itself
1564                          */
1565                         *p = NAMED_CURVE_TYPE;
1566                         p += 1;
1567                         *p = 0;
1568                         p += 1;
1569                         *p = curve_id;
1570                         p += 1;
1571                         *p = encodedlen;
1572                         p += 1;
1573                         memcpy((unsigned char*)p,
1574                             (unsigned char *)encodedPoint,
1575                             encodedlen);
1576                         OPENSSL_free(encodedPoint);
1577                         encodedPoint = NULL;
1578                         p += encodedlen;
1579                         }
1580 #endif
1581
1582                 /* not anonymous */
1583                 if (pkey != NULL)
1584                         {
1585                         /* n is the length of the params, they start at &(d[4])
1586                          * and p points to the space at the end. */
1587 #ifndef OPENSSL_NO_RSA
1588                         if (pkey->type == EVP_PKEY_RSA)
1589                                 {
1590                                 q=md_buf;
1591                                 j=0;
1592                                 for (num=2; num > 0; num--)
1593                                         {
1594                                         EVP_MD_CTX_set_flags(&md_ctx,
1595                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1596                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1597                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1598                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1599                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1600                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1601                                         EVP_DigestFinal_ex(&md_ctx,q,
1602                                                 (unsigned int *)&i);
1603                                         q+=i;
1604                                         j+=i;
1605                                         }
1606                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1607                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1608                                         {
1609                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1610                                         goto err;
1611                                         }
1612                                 s2n(u,p);
1613                                 n+=u+2;
1614                                 }
1615                         else
1616 #endif
1617 #if !defined(OPENSSL_NO_DSA)
1618                                 if (pkey->type == EVP_PKEY_DSA)
1619                                 {
1620                                 /* lets do DSS */
1621                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1622                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1623                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1624                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1625                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1626                                         (unsigned int *)&i,pkey))
1627                                         {
1628                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1629                                         goto err;
1630                                         }
1631                                 s2n(i,p);
1632                                 n+=i+2;
1633                                 }
1634                         else
1635 #endif
1636 #if !defined(OPENSSL_NO_ECDSA)
1637                                 if (pkey->type == EVP_PKEY_EC)
1638                                 {
1639                                 /* let's do ECDSA */
1640                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1641                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1642                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1643                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1644                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1645                                         (unsigned int *)&i,pkey))
1646                                         {
1647                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1648                                         goto err;
1649                                         }
1650                                 s2n(i,p);
1651                                 n+=i+2;
1652                                 }
1653                         else
1654 #endif
1655                                 {
1656                                 /* Is this error check actually needed? */
1657                                 al=SSL_AD_HANDSHAKE_FAILURE;
1658                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1659                                 goto f_err;
1660                                 }
1661                         }
1662
1663                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1664                 l2n3(n,d);
1665
1666                 /* we should now have things packed up, so lets send
1667                  * it off */
1668                 s->init_num=n+4;
1669                 s->init_off=0;
1670                 }
1671
1672         s->state = SSL3_ST_SW_KEY_EXCH_B;
1673         EVP_MD_CTX_cleanup(&md_ctx);
1674         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1675 f_err:
1676         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1677 err:
1678 #ifndef OPENSSL_NO_ECDH
1679         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1680         BN_CTX_free(bn_ctx);
1681 #endif
1682         EVP_MD_CTX_cleanup(&md_ctx);
1683         return(-1);
1684         }
1685
1686 int ssl3_send_certificate_request(SSL *s)
1687         {
1688         unsigned char *p,*d;
1689         int i,j,nl,off,n;
1690         STACK_OF(X509_NAME) *sk=NULL;
1691         X509_NAME *name;
1692         BUF_MEM *buf;
1693
1694         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1695                 {
1696                 buf=s->init_buf;
1697
1698                 d=p=(unsigned char *)&(buf->data[4]);
1699
1700                 /* get the list of acceptable cert types */
1701                 p++;
1702                 n=ssl3_get_req_cert_type(s,p);
1703                 d[0]=n;
1704                 p+=n;
1705                 n++;
1706
1707                 off=n;
1708                 p+=2;
1709                 n+=2;
1710
1711                 sk=SSL_get_client_CA_list(s);
1712                 nl=0;
1713                 if (sk != NULL)
1714                         {
1715                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1716                                 {
1717                                 name=sk_X509_NAME_value(sk,i);
1718                                 j=i2d_X509_NAME(name,NULL);
1719                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1720                                         {
1721                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1722                                         goto err;
1723                                         }
1724                                 p=(unsigned char *)&(buf->data[4+n]);
1725                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1726                                         {
1727                                         s2n(j,p);
1728                                         i2d_X509_NAME(name,&p);
1729                                         n+=2+j;
1730                                         nl+=2+j;
1731                                         }
1732                                 else
1733                                         {
1734                                         d=p;
1735                                         i2d_X509_NAME(name,&p);
1736                                         j-=2; s2n(j,d); j+=2;
1737                                         n+=j;
1738                                         nl+=j;
1739                                         }
1740                                 }
1741                         }
1742                 /* else no CA names */
1743                 p=(unsigned char *)&(buf->data[4+off]);
1744                 s2n(nl,p);
1745
1746                 d=(unsigned char *)buf->data;
1747                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1748                 l2n3(n,d);
1749
1750                 /* we should now have things packed up, so lets send
1751                  * it off */
1752
1753                 s->init_num=n+4;
1754                 s->init_off=0;
1755 #ifdef NETSCAPE_HANG_BUG
1756                 if (!BUF_MEM_grow_clean(buf, s->init_num + 4))
1757                         {
1758                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1759                         goto err;
1760                         }
1761                 p=(unsigned char *)s->init_buf->data + s->init_num;
1762
1763                 /* do the header */
1764                 *(p++)=SSL3_MT_SERVER_DONE;
1765                 *(p++)=0;
1766                 *(p++)=0;
1767                 *(p++)=0;
1768                 s->init_num += 4;
1769 #endif
1770
1771                 s->state = SSL3_ST_SW_CERT_REQ_B;
1772                 }
1773
1774         /* SSL3_ST_SW_CERT_REQ_B */
1775         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1776 err:
1777         return(-1);
1778         }
1779
1780 int ssl3_get_client_key_exchange(SSL *s)
1781         {
1782         int i,al,ok;
1783         long n;
1784         unsigned long l;
1785         unsigned char *p;
1786 #ifndef OPENSSL_NO_RSA
1787         RSA *rsa=NULL;
1788         EVP_PKEY *pkey=NULL;
1789 #endif
1790 #ifndef OPENSSL_NO_DH
1791         BIGNUM *pub=NULL;
1792         DH *dh_srvr;
1793 #endif
1794 #ifndef OPENSSL_NO_KRB5
1795         KSSL_ERR kssl_err;
1796 #endif /* OPENSSL_NO_KRB5 */
1797
1798 #ifndef OPENSSL_NO_ECDH
1799         EC_KEY *srvr_ecdh = NULL;
1800         EVP_PKEY *clnt_pub_pkey = NULL;
1801         EC_POINT *clnt_ecpoint = NULL;
1802         BN_CTX *bn_ctx = NULL;
1803 #endif
1804
1805         n=s->method->ssl_get_message(s,
1806                 SSL3_ST_SR_KEY_EXCH_A,
1807                 SSL3_ST_SR_KEY_EXCH_B,
1808                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1809                 2048, /* ??? */
1810                 &ok);
1811
1812         if (!ok) return((int)n);
1813         p=(unsigned char *)s->init_msg;
1814
1815         l=s->s3->tmp.new_cipher->algorithms;
1816
1817 #ifndef OPENSSL_NO_RSA
1818         if (l & SSL_kRSA)
1819                 {
1820                 unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
1821                 int decrypt_len;
1822                 unsigned char decrypt_good, version_good;
1823
1824                 /* FIX THIS UP EAY EAY EAY EAY */
1825                 if (s->s3->tmp.use_rsa_tmp)
1826                         {
1827                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1828                                 rsa=s->cert->rsa_tmp;
1829                         /* Don't do a callback because rsa_tmp should
1830                          * be sent already */
1831                         if (rsa == NULL)
1832                                 {
1833                                 al=SSL_AD_HANDSHAKE_FAILURE;
1834                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1835                                 goto f_err;
1836
1837                                 }
1838                         }
1839                 else
1840                         {
1841                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1842                         if (    (pkey == NULL) ||
1843                                 (pkey->type != EVP_PKEY_RSA) ||
1844                                 (pkey->pkey.rsa == NULL))
1845                                 {
1846                                 al=SSL_AD_HANDSHAKE_FAILURE;
1847                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1848                                 goto f_err;
1849                                 }
1850                         rsa=pkey->pkey.rsa;
1851                         }
1852
1853                 /* TLS and [incidentally] DTLS, including pre-0.9.8f */
1854                 if (s->version > SSL3_VERSION &&
1855                     s->client_version != DTLS1_BAD_VER)
1856                         {
1857                         n2s(p,i);
1858                         if (n != i+2)
1859                                 {
1860                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1861                                         {
1862                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1863                                         goto err;
1864                                         }
1865                                 else
1866                                         p-=2;
1867                                 }
1868                         else
1869                                 n=i;
1870                         }
1871
1872                 /* We must not leak whether a decryption failure occurs because
1873                  * of Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see
1874                  * RFC 2246, section 7.4.7.1). The code follows that advice of
1875                  * the TLS RFC and generates a random premaster secret for the
1876                  * case that the decrypt fails. See
1877                  * https://tools.ietf.org/html/rfc5246#section-7.4.7.1 */
1878
1879                 /* should be RAND_bytes, but we cannot work around a failure. */
1880                 if (RAND_pseudo_bytes(rand_premaster_secret,
1881                                       sizeof(rand_premaster_secret)) <= 0)
1882                         goto err;
1883                 decrypt_len = RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1884                 ERR_clear_error();
1885
1886                 /* decrypt_len should be SSL_MAX_MASTER_KEY_LENGTH.
1887                  * decrypt_good will be 0xff if so and zero otherwise. */
1888                 decrypt_good = constant_time_eq_int_8(decrypt_len, SSL_MAX_MASTER_KEY_LENGTH);
1889
1890                 /* If the version in the decrypted pre-master secret is correct
1891                  * then version_good will be 0xff, otherwise it'll be zero.
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". Thus version checks
1895                  * are done in constant time and are treated like any other
1896                  * decryption error. */
1897                 version_good = constant_time_eq_8(p[0], (unsigned)(s->client_version>>8));
1898                 version_good &= constant_time_eq_8(p[1], (unsigned)(s->client_version&0xff));
1899
1900                 /* The premaster secret must contain the same version number as
1901                  * the ClientHello to detect version rollback attacks
1902                  * (strangely, the protocol does not offer such protection for
1903                  * DH ciphersuites). However, buggy clients exist that send the
1904                  * negotiated protocol version instead if the server does not
1905                  * support the requested protocol version. If
1906                  * SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1907                 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
1908                         {
1909                         unsigned char workaround_good;
1910                         workaround_good = constant_time_eq_8(p[0], (unsigned)(s->version>>8));
1911                         workaround_good &= constant_time_eq_8(p[1], (unsigned)(s->version&0xff));
1912                         version_good |= workaround_good;
1913                         }
1914
1915                 /* Both decryption and version must be good for decrypt_good
1916                  * to remain non-zero (0xff). */
1917                 decrypt_good &= version_good;
1918
1919                 /* Now copy rand_premaster_secret over p using
1920                  * decrypt_good_mask. */
1921                 for (i = 0; i < (int) sizeof(rand_premaster_secret); i++)
1922                         {
1923                         p[i] = constant_time_select_8(decrypt_good, p[i],
1924                                                       rand_premaster_secret[i]);
1925                         }
1926
1927                 s->session->master_key_length=
1928                         s->method->ssl3_enc->generate_master_secret(s,
1929                                 s->session->master_key,
1930                                 p,i);
1931                 OPENSSL_cleanse(p,i);
1932                 }
1933         else
1934 #endif
1935 #ifndef OPENSSL_NO_DH
1936                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1937                 {
1938                 n2s(p,i);
1939                 if (n != i+2)
1940                         {
1941                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1942                                 {
1943                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1944                                 goto err;
1945                                 }
1946                         else
1947                                 {
1948                                 p-=2;
1949                                 i=(int)n;
1950                                 }
1951                         }
1952
1953                 if (n == 0L) /* the parameters are in the cert */
1954                         {
1955                         al=SSL_AD_HANDSHAKE_FAILURE;
1956                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1957                         goto f_err;
1958                         }
1959                 else
1960                         {
1961                         if (s->s3->tmp.dh == NULL)
1962                                 {
1963                                 al=SSL_AD_HANDSHAKE_FAILURE;
1964                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1965                                 goto f_err;
1966                                 }
1967                         else
1968                                 dh_srvr=s->s3->tmp.dh;
1969                         }
1970
1971                 pub=BN_bin2bn(p,i,NULL);
1972                 if (pub == NULL)
1973                         {
1974                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1975                         goto err;
1976                         }
1977
1978                 i=DH_compute_key(p,pub,dh_srvr);
1979
1980                 if (i <= 0)
1981                         {
1982                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1983                         BN_clear_free(pub);
1984                         goto err;
1985                         }
1986
1987                 DH_free(s->s3->tmp.dh);
1988                 s->s3->tmp.dh=NULL;
1989
1990                 BN_clear_free(pub);
1991                 pub=NULL;
1992                 s->session->master_key_length=
1993                         s->method->ssl3_enc->generate_master_secret(s,
1994                                 s->session->master_key,p,i);
1995                 OPENSSL_cleanse(p,i);
1996                 }
1997         else
1998 #endif
1999 #ifndef OPENSSL_NO_KRB5
2000         if (l & SSL_kKRB5)
2001                 {
2002                 krb5_error_code         krb5rc;
2003                 krb5_data               enc_ticket;
2004                 krb5_data               authenticator;
2005                 krb5_data               enc_pms;
2006                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2007                 EVP_CIPHER_CTX          ciph_ctx;
2008                 EVP_CIPHER              *enc = NULL;
2009                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2010                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2011                                                + EVP_MAX_BLOCK_LENGTH];
2012                 int                     padl, outl;
2013                 krb5_timestamp          authtime = 0;
2014                 krb5_ticket_times       ttimes;
2015         int kerr = 0;
2016
2017                 EVP_CIPHER_CTX_init(&ciph_ctx);
2018
2019                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2020
2021                 n2s(p,i);
2022                 enc_ticket.length = i;
2023
2024                 if (n < (int)enc_ticket.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                 enc_ticket.data = (char *)p;
2032                 p+=enc_ticket.length;
2033
2034                 n2s(p,i);
2035                 authenticator.length = i;
2036
2037                 if (n < (int)(enc_ticket.length + authenticator.length) + 6)
2038                         {
2039                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2040                                 SSL_R_DATA_LENGTH_TOO_LONG);
2041                         goto err;
2042                         }
2043
2044                 authenticator.data = (char *)p;
2045                 p+=authenticator.length;
2046
2047                 n2s(p,i);
2048                 enc_pms.length = i;
2049                 enc_pms.data = (char *)p;
2050                 p+=enc_pms.length;
2051
2052                 /* Note that the length is checked again below,
2053                 ** after decryption
2054                 */
2055                 if(enc_pms.length > sizeof pms)
2056                         {
2057                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2058                                SSL_R_DATA_LENGTH_TOO_LONG);
2059                         goto err;
2060                         }
2061
2062                 if (n != (long)(enc_ticket.length + authenticator.length +
2063                                                 enc_pms.length + 6))
2064                         {
2065                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2066                                 SSL_R_DATA_LENGTH_TOO_LONG);
2067                         goto err;
2068                         }
2069
2070                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2071                                         &kssl_err)) != 0)
2072                         {
2073 #ifdef KSSL_DEBUG
2074                         printf("kssl_sget_tkt rtn %d [%d]\n",
2075                                 krb5rc, kssl_err.reason);
2076                         if (kssl_err.text)
2077                                 printf("kssl_err text= %s\n", kssl_err.text);
2078 #endif  /* KSSL_DEBUG */
2079                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2080                                 kssl_err.reason);
2081                         goto err;
2082                         }
2083
2084                 /*  Note: no authenticator is not considered an error,
2085                 **  but will return authtime == 0.
2086                 */
2087                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2088                                         &authtime, &kssl_err)) != 0)
2089                         {
2090 #ifdef KSSL_DEBUG
2091                         printf("kssl_check_authent rtn %d [%d]\n",
2092                                 krb5rc, kssl_err.reason);
2093                         if (kssl_err.text)
2094                                 printf("kssl_err text= %s\n", kssl_err.text);
2095 #endif  /* KSSL_DEBUG */
2096                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2097                                 kssl_err.reason);
2098                         goto err;
2099                         }
2100
2101                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2102                         {
2103                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2104                         goto err;
2105                         }
2106
2107 #ifdef KSSL_DEBUG
2108                 kssl_ctx_show(kssl_ctx);
2109 #endif  /* KSSL_DEBUG */
2110
2111                 enc = kssl_map_enc(kssl_ctx->enctype);
2112                 if (enc == NULL)
2113                     goto err;
2114
2115                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2116
2117                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2118                         {
2119                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2120                                 SSL_R_DECRYPTION_FAILED);
2121                         goto err;
2122                         }
2123                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2124                                         (unsigned char *)enc_pms.data, enc_pms.length))
2125                         {
2126                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2127                                 SSL_R_DECRYPTION_FAILED);
2128             kerr = 1;
2129             goto kclean;
2130                         }
2131                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2132                         {
2133                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2134                                 SSL_R_DATA_LENGTH_TOO_LONG);
2135             kerr = 1;
2136             goto kclean;
2137                         }
2138                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2139                         {
2140                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2141                                 SSL_R_DECRYPTION_FAILED);
2142             kerr = 1;
2143             goto kclean;
2144                         }
2145                 outl += padl;
2146                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2147                         {
2148                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2149                                 SSL_R_DATA_LENGTH_TOO_LONG);
2150             kerr = 1;
2151             goto kclean;
2152                         }
2153                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2154                     {
2155                     /* The premaster secret must contain the same version number as the
2156                      * ClientHello to detect version rollback attacks (strangely, the
2157                      * protocol does not offer such protection for DH ciphersuites).
2158                      * However, buggy clients exist that send random bytes instead of
2159                      * the protocol version.
2160                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2161                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2162                      */
2163                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2164                         {
2165                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2166                                SSL_AD_DECODE_ERROR);
2167                 kerr = 1;
2168                 goto kclean;
2169                         }
2170                     }
2171
2172                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2173
2174                 s->session->master_key_length=
2175                         s->method->ssl3_enc->generate_master_secret(s,
2176                                 s->session->master_key, pms, outl);
2177
2178                 if (kssl_ctx->client_princ)
2179                         {
2180                         size_t len = strlen(kssl_ctx->client_princ);
2181                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2182                                 {
2183                                 s->session->krb5_client_princ_len = len;
2184                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2185                                 }
2186                         }
2187
2188
2189                 /*  Was doing kssl_ctx_free() here,
2190                 **  but it caused problems for apache.
2191                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2192                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2193                 */
2194
2195  kclean:
2196         OPENSSL_cleanse(pms, sizeof(pms));
2197         if (kerr)
2198             goto err;
2199     } else
2200 #endif  /* OPENSSL_NO_KRB5 */
2201
2202 #ifndef OPENSSL_NO_ECDH
2203                 if ((l & SSL_kECDH) || (l & SSL_kECDHE))
2204                 {
2205                 int ret = 1;
2206                 int field_size = 0;
2207                 const EC_KEY   *tkey;
2208                 const EC_GROUP *group;
2209                 const BIGNUM *priv_key;
2210
2211                 /* initialize structures for server's ECDH key pair */
2212                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2213                         {
2214                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2215                             ERR_R_MALLOC_FAILURE);
2216                         goto err;
2217                         }
2218
2219                 /* Let's get server private key and group information */
2220                 if (l & SSL_kECDH)
2221                         {
2222                         /* use the certificate */
2223                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2224                         }
2225                 else
2226                         {
2227                         /* use the ephermeral values we saved when
2228                          * generating the ServerKeyExchange msg.
2229                          */
2230                         tkey = s->s3->tmp.ecdh;
2231                         }
2232
2233                 group    = EC_KEY_get0_group(tkey);
2234                 priv_key = EC_KEY_get0_private_key(tkey);
2235
2236                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2237                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2238                         {
2239                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2240                                ERR_R_EC_LIB);
2241                         goto err;
2242                         }
2243
2244                 /* Let's get client's public key */
2245                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2246                         {
2247                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2248                             ERR_R_MALLOC_FAILURE);
2249                         goto err;
2250                         }
2251
2252                 if (n == 0L)
2253                         {
2254                         /* Client Publickey was in Client Certificate */
2255
2256                          if (l & SSL_kECDHE)
2257                                  {
2258                                  al=SSL_AD_HANDSHAKE_FAILURE;
2259                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2260                                  goto f_err;
2261                                  }
2262                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2263                             == NULL) ||
2264                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2265                                 {
2266                                 /* XXX: For now, we do not support client
2267                                  * authentication using ECDH certificates
2268                                  * so this branch (n == 0L) of the code is
2269                                  * never executed. When that support is
2270                                  * added, we ought to ensure the key
2271                                  * received in the certificate is
2272                                  * authorized for key agreement.
2273                                  * ECDH_compute_key implicitly checks that
2274                                  * the two ECDH shares are for the same
2275                                  * group.
2276                                  */
2277                                 al=SSL_AD_HANDSHAKE_FAILURE;
2278                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2279                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2280                                 goto f_err;
2281                                 }
2282
2283                         if (EC_POINT_copy(clnt_ecpoint,
2284                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2285                                 {
2286                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2287                                         ERR_R_EC_LIB);
2288                                 goto err;
2289                                 }
2290                         ret = 2; /* Skip certificate verify processing */
2291                         }
2292                 else
2293                         {
2294                         /* Get client's public key from encoded point
2295                          * in the ClientKeyExchange message.
2296                          */
2297                         if ((bn_ctx = BN_CTX_new()) == NULL)
2298                                 {
2299                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2300                                     ERR_R_MALLOC_FAILURE);
2301                                 goto err;
2302                                 }
2303
2304                         /* Get encoded point length */
2305                         i = *p;
2306                         p += 1;
2307                         if (n != 1 + i)
2308                                 {
2309                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2310                                     ERR_R_EC_LIB);
2311                                 goto err;
2312                                 }
2313                         if (EC_POINT_oct2point(group,
2314                             clnt_ecpoint, p, i, bn_ctx) == 0)
2315                                 {
2316                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2317                                     ERR_R_EC_LIB);
2318                                 goto err;
2319                                 }
2320                         /* p is pointing to somewhere in the buffer
2321                          * currently, so set it to the start
2322                          */
2323                         p=(unsigned char *)s->init_buf->data;
2324                         }
2325
2326                 /* Compute the shared pre-master secret */
2327                 field_size = EC_GROUP_get_degree(group);
2328                 if (field_size <= 0)
2329                         {
2330                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2331                                ERR_R_ECDH_LIB);
2332                         goto err;
2333                         }
2334                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2335                 if (i <= 0)
2336                         {
2337                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2338                             ERR_R_ECDH_LIB);
2339                         goto err;
2340                         }
2341
2342                 EVP_PKEY_free(clnt_pub_pkey);
2343                 EC_POINT_free(clnt_ecpoint);
2344                 if (srvr_ecdh != NULL)
2345                         EC_KEY_free(srvr_ecdh);
2346                 BN_CTX_free(bn_ctx);
2347
2348                 /* Compute the master secret */
2349                 s->session->master_key_length = s->method->ssl3_enc-> \
2350                     generate_master_secret(s, s->session->master_key, p, i);
2351
2352                 OPENSSL_cleanse(p, i);
2353                 return (ret);
2354                 }
2355         else
2356 #endif
2357                 {
2358                 al=SSL_AD_HANDSHAKE_FAILURE;
2359                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2360                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2361                 goto f_err;
2362                 }
2363
2364         return(1);
2365 f_err:
2366         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2367 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2368 err:
2369 #endif
2370 #ifndef OPENSSL_NO_ECDH
2371         EVP_PKEY_free(clnt_pub_pkey);
2372         EC_POINT_free(clnt_ecpoint);
2373         if (srvr_ecdh != NULL)
2374                 EC_KEY_free(srvr_ecdh);
2375         BN_CTX_free(bn_ctx);
2376 #endif
2377         return(-1);
2378         }
2379
2380 int ssl3_get_cert_verify(SSL *s)
2381         {
2382         EVP_PKEY *pkey=NULL;
2383         unsigned char *p;
2384         int al,ok,ret=0;
2385         long n;
2386         int type=0,i,j;
2387         X509 *peer;
2388
2389         n=s->method->ssl_get_message(s,
2390                 SSL3_ST_SR_CERT_VRFY_A,
2391                 SSL3_ST_SR_CERT_VRFY_B,
2392                 -1,
2393                 SSL3_RT_MAX_PLAIN_LENGTH,
2394                 &ok);
2395
2396         if (!ok) return((int)n);
2397
2398         if (s->session->peer != NULL)
2399                 {
2400                 peer=s->session->peer;
2401                 pkey=X509_get_pubkey(peer);
2402                 type=X509_certificate_type(peer,pkey);
2403                 }
2404         else
2405                 {
2406                 peer=NULL;
2407                 pkey=NULL;
2408                 }
2409
2410         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2411                 {
2412                 s->s3->tmp.reuse_message=1;
2413                 if (peer != NULL)
2414                         {
2415                         al=SSL_AD_UNEXPECTED_MESSAGE;
2416                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2417                         goto f_err;
2418                         }
2419                 ret=1;
2420                 goto end;
2421                 }
2422
2423         if (peer == NULL)
2424                 {
2425                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2426                 al=SSL_AD_UNEXPECTED_MESSAGE;
2427                 goto f_err;
2428                 }
2429
2430         if (!(type & EVP_PKT_SIGN))
2431                 {
2432                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2433                 al=SSL_AD_ILLEGAL_PARAMETER;
2434                 goto f_err;
2435                 }
2436
2437         if (s->s3->change_cipher_spec)
2438                 {
2439                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2440                 al=SSL_AD_UNEXPECTED_MESSAGE;
2441                 goto f_err;
2442                 }
2443
2444         /* we now have a signature that we need to verify */
2445         p=(unsigned char *)s->init_msg;
2446         n2s(p,i);
2447         n-=2;
2448         if (i > n)
2449                 {
2450                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2451                 al=SSL_AD_DECODE_ERROR;
2452                 goto f_err;
2453                 }
2454
2455         j=EVP_PKEY_size(pkey);
2456         if ((i > j) || (n > j) || (n <= 0))
2457                 {
2458                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2459                 al=SSL_AD_DECODE_ERROR;
2460                 goto f_err;
2461                 }
2462
2463 #ifndef OPENSSL_NO_RSA
2464         if (pkey->type == EVP_PKEY_RSA)
2465                 {
2466                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2467                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
2468                                                         pkey->pkey.rsa);
2469                 if (i < 0)
2470                         {
2471                         al=SSL_AD_DECRYPT_ERROR;
2472                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2473                         goto f_err;
2474                         }
2475                 if (i == 0)
2476                         {
2477                         al=SSL_AD_DECRYPT_ERROR;
2478                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2479                         goto f_err;
2480                         }
2481                 }
2482         else
2483 #endif
2484 #ifndef OPENSSL_NO_DSA
2485                 if (pkey->type == EVP_PKEY_DSA)
2486                 {
2487                 j=DSA_verify(pkey->save_type,
2488                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2489                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2490                 if (j <= 0)
2491                         {
2492                         /* bad signature */
2493                         al=SSL_AD_DECRYPT_ERROR;
2494                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2495                         goto f_err;
2496                         }
2497                 }
2498         else
2499 #endif
2500 #ifndef OPENSSL_NO_ECDSA
2501                 if (pkey->type == EVP_PKEY_EC)
2502                 {
2503                 j=ECDSA_verify(pkey->save_type,
2504                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2505                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2506                 if (j <= 0)
2507                         {
2508                         /* bad signature */
2509                         al=SSL_AD_DECRYPT_ERROR;
2510                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2511                             SSL_R_BAD_ECDSA_SIGNATURE);
2512                         goto f_err;
2513                         }
2514                 }
2515         else
2516 #endif
2517                 {
2518                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2519                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2520                 goto f_err;
2521                 }
2522
2523
2524         ret=1;
2525         if (0)
2526                 {
2527 f_err:
2528                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2529                 }
2530 end:
2531         EVP_PKEY_free(pkey);
2532         return(ret);
2533         }
2534
2535 int ssl3_get_client_certificate(SSL *s)
2536         {
2537         int i,ok,al,ret= -1;
2538         X509 *x=NULL;
2539         unsigned long l,nc,llen,n;
2540         const unsigned char *p,*q;
2541         unsigned char *d;
2542         STACK_OF(X509) *sk=NULL;
2543
2544         n=s->method->ssl_get_message(s,
2545                 SSL3_ST_SR_CERT_A,
2546                 SSL3_ST_SR_CERT_B,
2547                 -1,
2548                 s->max_cert_list,
2549                 &ok);
2550
2551         if (!ok) return((int)n);
2552
2553         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2554                 {
2555                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2556                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2557                         {
2558                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2559                         al=SSL_AD_HANDSHAKE_FAILURE;
2560                         goto f_err;
2561                         }
2562                 /* If tls asked for a client cert, the client must return a 0 list */
2563                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2564                         {
2565                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2566                         al=SSL_AD_UNEXPECTED_MESSAGE;
2567                         goto f_err;
2568                         }
2569                 s->s3->tmp.reuse_message=1;
2570                 return(1);
2571                 }
2572
2573         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2574                 {
2575                 al=SSL_AD_UNEXPECTED_MESSAGE;
2576                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2577                 goto f_err;
2578                 }
2579         p=d=(unsigned char *)s->init_msg;
2580
2581         if ((sk=sk_X509_new_null()) == NULL)
2582                 {
2583                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2584                 goto err;
2585                 }
2586
2587         n2l3(p,llen);
2588         if (llen+3 != n)
2589                 {
2590                 al=SSL_AD_DECODE_ERROR;
2591                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2592                 goto f_err;
2593                 }
2594         for (nc=0; nc<llen; )
2595                 {
2596                 n2l3(p,l);
2597                 if ((l+nc+3) > llen)
2598                         {
2599                         al=SSL_AD_DECODE_ERROR;
2600                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2601                         goto f_err;
2602                         }
2603
2604                 q=p;
2605                 x=d2i_X509(NULL,&p,l);
2606                 if (x == NULL)
2607                         {
2608                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2609                         goto err;
2610                         }
2611                 if (p != (q+l))
2612                         {
2613                         al=SSL_AD_DECODE_ERROR;
2614                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2615                         goto f_err;
2616                         }
2617                 if (!sk_X509_push(sk,x))
2618                         {
2619                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2620                         goto err;
2621                         }
2622                 x=NULL;
2623                 nc+=l+3;
2624                 }
2625
2626         if (sk_X509_num(sk) <= 0)
2627                 {
2628                 /* TLS does not mind 0 certs returned */
2629                 if (s->version == SSL3_VERSION)
2630                         {
2631                         al=SSL_AD_HANDSHAKE_FAILURE;
2632                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2633                         goto f_err;
2634                         }
2635                 /* Fail for TLS only if we required a certificate */
2636                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2637                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2638                         {
2639                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2640                         al=SSL_AD_HANDSHAKE_FAILURE;
2641                         goto f_err;
2642                         }
2643                 }
2644         else
2645                 {
2646                 i=ssl_verify_cert_chain(s,sk);
2647                 if (i <= 0)
2648                         {
2649                         al=ssl_verify_alarm_type(s->verify_result);
2650                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2651                         goto f_err;
2652                         }
2653                 }
2654
2655         if (s->session->peer != NULL) /* This should not be needed */
2656                 X509_free(s->session->peer);
2657         s->session->peer=sk_X509_shift(sk);
2658         s->session->verify_result = s->verify_result;
2659
2660         /* With the current implementation, sess_cert will always be NULL
2661          * when we arrive here. */
2662         if (s->session->sess_cert == NULL)
2663                 {
2664                 s->session->sess_cert = ssl_sess_cert_new();
2665                 if (s->session->sess_cert == NULL)
2666                         {
2667                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2668                         goto err;
2669                         }
2670                 }
2671         if (s->session->sess_cert->cert_chain != NULL)
2672                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2673         s->session->sess_cert->cert_chain=sk;
2674         /* Inconsistency alert: cert_chain does *not* include the
2675          * peer's own certificate, while we do include it in s3_clnt.c */
2676
2677         sk=NULL;
2678
2679         ret=1;
2680         if (0)
2681                 {
2682 f_err:
2683                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2684                 }
2685 err:
2686         if (x != NULL) X509_free(x);
2687         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2688         return(ret);
2689         }
2690
2691 int ssl3_send_server_certificate(SSL *s)
2692         {
2693         unsigned long l;
2694         X509 *x;
2695
2696         if (s->state == SSL3_ST_SW_CERT_A)
2697                 {
2698                 x=ssl_get_server_send_cert(s);
2699                 if (x == NULL &&
2700                         /* VRS: allow null cert if auth == KRB5 */
2701                         (s->s3->tmp.new_cipher->algorithms
2702                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
2703                         != (SSL_aKRB5|SSL_kKRB5))
2704                         {
2705                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2706                         return(0);
2707                         }
2708
2709                 l=ssl3_output_cert_chain(s,x);
2710                 s->state=SSL3_ST_SW_CERT_B;
2711                 s->init_num=(int)l;
2712                 s->init_off=0;
2713                 }
2714
2715         /* SSL3_ST_SW_CERT_B */
2716         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2717         }
2718
2719
2720 #ifndef OPENSSL_NO_ECDH
2721 /* This is the complement of curve_id2nid in s3_clnt.c. */
2722 static int nid2curve_id(int nid)
2723 {
2724         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2725          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2726         switch (nid) {
2727         case NID_sect163k1: /* sect163k1 (1) */
2728                 return 1;
2729         case NID_sect163r1: /* sect163r1 (2) */
2730                 return 2;
2731         case NID_sect163r2: /* sect163r2 (3) */
2732                 return 3;
2733         case NID_sect193r1: /* sect193r1 (4) */
2734                 return 4;
2735         case NID_sect193r2: /* sect193r2 (5) */
2736                 return 5;
2737         case NID_sect233k1: /* sect233k1 (6) */
2738                 return 6;
2739         case NID_sect233r1: /* sect233r1 (7) */
2740                 return 7;
2741         case NID_sect239k1: /* sect239k1 (8) */
2742                 return 8;
2743         case NID_sect283k1: /* sect283k1 (9) */
2744                 return 9;
2745         case NID_sect283r1: /* sect283r1 (10) */
2746                 return 10;
2747         case NID_sect409k1: /* sect409k1 (11) */
2748                 return 11;
2749         case NID_sect409r1: /* sect409r1 (12) */
2750                 return 12;
2751         case NID_sect571k1: /* sect571k1 (13) */
2752                 return 13;
2753         case NID_sect571r1: /* sect571r1 (14) */
2754                 return 14;
2755         case NID_secp160k1: /* secp160k1 (15) */
2756                 return 15;
2757         case NID_secp160r1: /* secp160r1 (16) */
2758                 return 16;
2759         case NID_secp160r2: /* secp160r2 (17) */
2760                 return 17;
2761         case NID_secp192k1: /* secp192k1 (18) */
2762                 return 18;
2763         case NID_X9_62_prime192v1: /* secp192r1 (19) */
2764                 return 19;
2765         case NID_secp224k1: /* secp224k1 (20) */
2766                 return 20;
2767         case NID_secp224r1: /* secp224r1 (21) */
2768                 return 21;
2769         case NID_secp256k1: /* secp256k1 (22) */
2770                 return 22;
2771         case NID_X9_62_prime256v1: /* secp256r1 (23) */
2772                 return 23;
2773         case NID_secp384r1: /* secp384r1 (24) */
2774                 return 24;
2775         case NID_secp521r1:  /* secp521r1 (25) */
2776                 return 25;
2777         default:
2778                 return 0;
2779         }
2780 }
2781 #endif
2782 #ifndef OPENSSL_NO_TLSEXT
2783 int ssl3_send_newsession_ticket(SSL *s)
2784         {
2785         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
2786                 {
2787                 unsigned char *p, *senc, *macstart;
2788                 int len, slen;
2789                 unsigned int hlen;
2790                 EVP_CIPHER_CTX ctx;
2791                 HMAC_CTX hctx;
2792                 SSL_CTX *tctx = s->initial_ctx;
2793                 unsigned char iv[EVP_MAX_IV_LENGTH];
2794                 unsigned char key_name[16];
2795
2796                 /* get session encoding length */
2797                 slen = i2d_SSL_SESSION(s->session, NULL);
2798                 /* Some length values are 16 bits, so forget it if session is
2799                  * too long
2800                  */
2801                 if (slen > 0xFF00)
2802                         return -1;
2803                 /* Grow buffer if need be: the length calculation is as
2804                  * follows 1 (size of message name) + 3 (message length
2805                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
2806                  * 16 (key name) + max_iv_len (iv length) +
2807                  * session_length + max_enc_block_size (max encrypted session
2808                  * length) + max_md_size (HMAC).
2809                  */
2810                 if (!BUF_MEM_grow(s->init_buf,
2811                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
2812                         EVP_MAX_MD_SIZE + slen))
2813                         return -1;
2814                 senc = OPENSSL_malloc(slen);
2815                 if (!senc)
2816                         return -1;
2817                 p = senc;
2818                 i2d_SSL_SESSION(s->session, &p);
2819
2820                 p=(unsigned char *)s->init_buf->data;
2821                 /* do the header */
2822                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
2823                 /* Skip message length for now */
2824                 p += 3;
2825                 EVP_CIPHER_CTX_init(&ctx);
2826                 HMAC_CTX_init(&hctx);
2827                 /* Initialize HMAC and cipher contexts. If callback present
2828                  * it does all the work otherwise use generated values
2829                  * from parent ctx.
2830                  */
2831                 if (tctx->tlsext_ticket_key_cb)
2832                         {
2833                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
2834                                                          &hctx, 1) < 0)
2835                                 {
2836                                 OPENSSL_free(senc);
2837                                 return -1;
2838                                 }
2839                         }
2840                 else
2841                         {
2842                         RAND_pseudo_bytes(iv, 16);
2843                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
2844                                         tctx->tlsext_tick_aes_key, iv);
2845                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
2846                                         tlsext_tick_md(), NULL);
2847                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
2848                         }
2849                 l2n(s->session->tlsext_tick_lifetime_hint, p);
2850                 /* Skip ticket length for now */
2851                 p += 2;
2852                 /* Output key name */
2853                 macstart = p;
2854                 memcpy(p, key_name, 16);
2855                 p += 16;
2856                 /* output IV */
2857                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
2858                 p += EVP_CIPHER_CTX_iv_length(&ctx);
2859                 /* Encrypt session data */
2860                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
2861                 p += len;
2862                 EVP_EncryptFinal(&ctx, p, &len);
2863                 p += len;
2864                 EVP_CIPHER_CTX_cleanup(&ctx);
2865
2866                 HMAC_Update(&hctx, macstart, p - macstart);
2867                 HMAC_Final(&hctx, p, &hlen);
2868                 HMAC_CTX_cleanup(&hctx);
2869
2870                 p += hlen;
2871                 /* Now write out lengths: p points to end of data written */
2872                 /* Total length */
2873                 len = p - (unsigned char *)s->init_buf->data;
2874                 p=(unsigned char *)s->init_buf->data + 1;
2875                 l2n3(len - 4, p); /* Message length */
2876                 p += 4;
2877                 s2n(len - 10, p);  /* Ticket length */
2878
2879                 /* number of bytes to write */
2880                 s->init_num= len;
2881                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
2882                 s->init_off=0;
2883                 OPENSSL_free(senc);
2884                 }
2885
2886         /* SSL3_ST_SW_SESSION_TICKET_B */
2887         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2888         }
2889
2890 int ssl3_send_cert_status(SSL *s)
2891         {
2892         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
2893                 {
2894                 unsigned char *p;
2895                 /* Grow buffer if need be: the length calculation is as
2896                  * follows 1 (message type) + 3 (message length) +
2897                  * 1 (ocsp response type) + 3 (ocsp response length)
2898                  * + (ocsp response)
2899                  */
2900                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
2901                         return -1;
2902
2903                 p=(unsigned char *)s->init_buf->data;
2904
2905                 /* do the header */
2906                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
2907                 /* message length */
2908                 l2n3(s->tlsext_ocsp_resplen + 4, p);
2909                 /* status type */
2910                 *(p++)= s->tlsext_status_type;
2911                 /* length of OCSP response */
2912                 l2n3(s->tlsext_ocsp_resplen, p);
2913                 /* actual response */
2914                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
2915                 /* number of bytes to write */
2916                 s->init_num = 8 + s->tlsext_ocsp_resplen;
2917                 s->state=SSL3_ST_SW_CERT_STATUS_B;
2918                 s->init_off = 0;
2919                 }
2920
2921         /* SSL3_ST_SW_CERT_STATUS_B */
2922         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2923         }
2924 #endif