ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2005 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124
 125 #define REUSE_CIPHER_BUG
 126 #define NETSCAPE_HANG_BUG
 127
 128 #include <stdio.h>
 129 #include "ssl_locl.h"
 130 #include "kssl_lcl.h"
 131 #include <openssl/buffer.h>
 132 #include <openssl/rand.h>
 133 #include <openssl/objects.h>
 134 #include <openssl/evp.h>
 135 #include <openssl/hmac.h>
 136 #include <openssl/x509.h>
 137 #ifndef OPENSSL_NO_DH
 138 #include <openssl/dh.h>
 139 #endif
 140 #include <openssl/bn.h>
 141 #ifndef OPENSSL_NO_KRB5
 142 #include <openssl/krb5_asn.h>
 143 #endif
 144 #include <openssl/md5.h>
 145
 146 static SSL_METHOD *ssl3_get_server_method(int ver);
 147 #ifndef OPENSSL_NO_ECDH
 148 static int nid2curve_id(int nid);
 149 #endif
 150
 151 static SSL_METHOD *ssl3_get_server_method(int ver)
 152         {
 153         if (ver == SSL3_VERSION)
 154                 return(SSLv3_server_method());
 155         else
 156                 return(NULL);
 157         }
 158
 159 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
 160                         ssl3_accept,
 161                         ssl_undefined_function,
 162                         ssl3_get_server_method)
 163
 164 int ssl3_accept(SSL *s)
 165         {
 166         BUF_MEM *buf;
 167         unsigned long l,Time=(unsigned long)time(NULL);
 168         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 169         int ret= -1;
 170         int new_state,state,skip=0;
 171
 172         RAND_add(&Time,sizeof(Time),0);
 173         ERR_clear_error();
 174         clear_sys_error();
 175
 176         if (s->info_callback != NULL)
 177                 cb=s->info_callback;
 178         else if (s->ctx->info_callback != NULL)
 179                 cb=s->ctx->info_callback;
 180
 181         /* init things to blank */
 182         s->in_handshake++;
 183         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 184
 185         if (s->cert == NULL)
 186                 {
 187                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 188                 return(-1);
 189                 }
 190
 191         for (;;)
 192                 {
 193                 state=s->state;
 194
 195                 switch (s->state)
 196                         {
 197                 case SSL_ST_RENEGOTIATE:
 198                         s->new_session=1;
 199                         /* s->state=SSL_ST_ACCEPT; */
 200
 201                 case SSL_ST_BEFORE:
 202                 case SSL_ST_ACCEPT:
 203                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 204                 case SSL_ST_OK|SSL_ST_ACCEPT:
 205
 206                         s->server=1;
 207                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 208
 209                         if ((s->version>>8) != 3)
 210                                 {
 211                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 212                                 return -1;
 213                                 }
 214                         s->type=SSL_ST_ACCEPT;
 215
 216                         if (s->init_buf == NULL)
 217                                 {
 218                                 if ((buf=BUF_MEM_new()) == NULL)
 219                                         {
 220                                         ret= -1;
 221                                         goto end;
 222                                         }
 223                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 224                                         {
 225                                         ret= -1;
 226                                         goto end;
 227                                         }
 228                                 s->init_buf=buf;
 229                                 }
 230
 231                         if (!ssl3_setup_buffers(s))
 232                                 {
 233                                 ret= -1;
 234                                 goto end;
 235                                 }
 236
 237                         s->init_num=0;
 238                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
 239
 240                         if (s->state != SSL_ST_RENEGOTIATE)
 241                                 {
 242                                 /* Ok, we now need to push on a buffering BIO so that
 243                                  * the output is sent in a way that TCP likes :-)
 244                                  */
 245                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 246
 247                                 ssl3_init_finished_mac(s);
 248                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 249                                 s->ctx->stats.sess_accept++;
 250                                 }
 251                         else if (!s->s3->send_connection_binding &&
 252                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
 253                                 {
 254                                 /* Server attempting to renegotiate with
 255                                  * client that doesn't support secure
 256                                  * renegotiation.
 257                                  */
 258                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
 259                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 260                                 ret = -1;
 261                                 goto end;
 262                                 }
 263                         else
 264                                 {
 265                                 /* s->state == SSL_ST_RENEGOTIATE,
 266                                  * we will just send a HelloRequest */
 267                                 s->ctx->stats.sess_accept_renegotiate++;
 268                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 269                                 }
 270                         break;
 271
 272                 case SSL3_ST_SW_HELLO_REQ_A:
 273                 case SSL3_ST_SW_HELLO_REQ_B:
 274
 275                         s->shutdown=0;
 276                         ret=ssl3_send_hello_request(s);
 277                         if (ret <= 0) goto end;
 278                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 279                         s->state=SSL3_ST_SW_FLUSH;
 280                         s->init_num=0;
 281
 282                         ssl3_init_finished_mac(s);
 283                         break;
 284
 285                 case SSL3_ST_SW_HELLO_REQ_C:
 286                         s->state=SSL_ST_OK;
 287                         break;
 288
 289                 case SSL3_ST_SR_CLNT_HELLO_A:
 290                 case SSL3_ST_SR_CLNT_HELLO_B:
 291                 case SSL3_ST_SR_CLNT_HELLO_C:
 292
 293                         s->shutdown=0;
 294                         ret=ssl3_get_client_hello(s);
 295                         if (ret <= 0) goto end;
 296                         s->new_session = 2;
 297                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 298                         s->init_num=0;
 299                         break;
 300
 301                 case SSL3_ST_SW_SRVR_HELLO_A:
 302                 case SSL3_ST_SW_SRVR_HELLO_B:
 303                         ret=ssl3_send_server_hello(s);
 304                         if (ret <= 0) goto end;
 305 #ifndef OPENSSL_NO_TLSEXT
 306                         if (s->hit)
 307                                 {
 308                                 if (s->tlsext_ticket_expected)
 309                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 310                                 else
 311                                         s->state=SSL3_ST_SW_CHANGE_A;
 312                                 }
 313 #else
 314                         if (s->hit)
 315                                         s->state=SSL3_ST_SW_CHANGE_A;
 316 #endif
 317                         else
 318                                 s->state=SSL3_ST_SW_CERT_A;
 319                         s->init_num=0;
 320                         break;
 321
 322                 case SSL3_ST_SW_CERT_A:
 323                 case SSL3_ST_SW_CERT_B:
 324                         /* Check if it is anon DH or anon ECDH or KRB5 */
 325                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)
 326                                 && !(s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 327                                 {
 328                                 ret=ssl3_send_server_certificate(s);
 329                                 if (ret <= 0) goto end;
 330 #ifndef OPENSSL_NO_TLSEXT
 331                                 if (s->tlsext_status_expected)
 332                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 333                                 else
 334                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 335                                 }
 336                         else
 337                                 {
 338                                 skip = 1;
 339                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 340                                 }
 341 #else
 342                                 }
 343                         else
 344                                 skip=1;
 345
 346                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 347 #endif
 348                         s->init_num=0;
 349                         break;
 350
 351                 case SSL3_ST_SW_KEY_EXCH_A:
 352                 case SSL3_ST_SW_KEY_EXCH_B:
 353                         l=s->s3->tmp.new_cipher->algorithms;
 354
 355                         /* clear this, it may get reset by
 356                          * send_server_key_exchange */
 357                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 358 #ifndef OPENSSL_NO_KRB5
 359                                 && !(l & SSL_KRB5)
 360 #endif /* OPENSSL_NO_KRB5 */
 361                                 )
 362                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 363                                  * even when forbidden by protocol specs
 364                                  * (handshake may fail as clients are not required to
 365                                  * be able to handle this) */
 366                                 s->s3->tmp.use_rsa_tmp=1;
 367                         else
 368                                 s->s3->tmp.use_rsa_tmp=0;
 369
 370
 371                         /* only send if a DH key exchange, fortezza or
 372                          * RSA but we have a sign only certificate
 373                          *
 374                          * For ECC ciphersuites, we send a serverKeyExchange
 375                          * message only if the cipher suite is either
 376                          * ECDH-anon or ECDHE. In other cases, the
 377                          * server certificate contains the server's
 378                          * public key for key exchange.
 379                          */
 380                         if (s->s3->tmp.use_rsa_tmp
 381                             || (l & SSL_kECDHE)
 382                             || (l & (SSL_DH|SSL_kFZA))
 383                             || ((l & SSL_kRSA)
 384                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 385                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 386                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 387                                         )
 388                                     )
 389                                 )
 390                             )
 391                                 {
 392                                 ret=ssl3_send_server_key_exchange(s);
 393                                 if (ret <= 0) goto end;
 394                                 }
 395                         else
 396                                 skip=1;
 397
 398                         s->state=SSL3_ST_SW_CERT_REQ_A;
 399                         s->init_num=0;
 400                         break;
 401
 402                 case SSL3_ST_SW_CERT_REQ_A:
 403                 case SSL3_ST_SW_CERT_REQ_B:
 404                         if (/* don't request cert unless asked for it: */
 405                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 406                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 407                                  * don't request cert during re-negotiation: */
 408                                 ((s->session->peer != NULL) &&
 409                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 410                                 /* never request cert in anonymous ciphersuites
 411                                  * (see section "Certificate request" in SSL 3 drafts
 412                                  * and in RFC 2246): */
 413                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 414                                  /* ... except when the application insists on verification
 415                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 416                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 417                                  /* never request cert in Kerberos ciphersuites */
 418                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 419                                 {
 420                                 /* no cert request */
 421                                 skip=1;
 422                                 s->s3->tmp.cert_request=0;
 423                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 424                                 }
 425                         else
 426                                 {
 427                                 s->s3->tmp.cert_request=1;
 428                                 ret=ssl3_send_certificate_request(s);
 429                                 if (ret <= 0) goto end;
 430 #ifndef NETSCAPE_HANG_BUG
 431                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 432 #else
 433                                 s->state=SSL3_ST_SW_FLUSH;
 434                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 435 #endif
 436                                 s->init_num=0;
 437                                 }
 438                         break;
 439
 440                 case SSL3_ST_SW_SRVR_DONE_A:
 441                 case SSL3_ST_SW_SRVR_DONE_B:
 442                         ret=ssl3_send_server_done(s);
 443                         if (ret <= 0) goto end;
 444                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 445                         s->state=SSL3_ST_SW_FLUSH;
 446                         s->init_num=0;
 447                         break;
 448
 449                 case SSL3_ST_SW_FLUSH:
 450
 451                         /* This code originally checked to see if
 452                          * any data was pending using BIO_CTRL_INFO
 453                          * and then flushed. This caused problems
 454                          * as documented in PR#1939. The proposed
 455                          * fix doesn't completely resolve this issue
 456                          * as buggy implementations of BIO_CTRL_PENDING
 457                          * still exist. So instead we just flush
 458                          * unconditionally.
 459                          */
 460
 461                         s->rwstate=SSL_WRITING;
 462                         if (BIO_flush(s->wbio) <= 0)
 463                                 {
 464                                 ret= -1;
 465                                 goto end;
 466                                 }
 467                         s->rwstate=SSL_NOTHING;
 468
 469                         s->state=s->s3->tmp.next_state;
 470                         break;
 471
 472                 case SSL3_ST_SR_CERT_A:
 473                 case SSL3_ST_SR_CERT_B:
 474                         /* Check for second client hello (MS SGC) */
 475                         ret = ssl3_check_client_hello(s);
 476                         if (ret <= 0)
 477                                 goto end;
 478                         if (ret == 2)
 479                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 480                         else {
 481                                 if (s->s3->tmp.cert_request)
 482                                         {
 483                                         ret=ssl3_get_client_certificate(s);
 484                                         if (ret <= 0) goto end;
 485                                         }
 486                                 s->init_num=0;
 487                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 488                         }
 489                         break;
 490
 491                 case SSL3_ST_SR_KEY_EXCH_A:
 492                 case SSL3_ST_SR_KEY_EXCH_B:
 493                         ret=ssl3_get_client_key_exchange(s);
 494                         if (ret <= 0)
 495                                 goto end;
 496                         if (ret == 2)
 497                                 {
 498                                 /* For the ECDH ciphersuites when
 499                                  * the client sends its ECDH pub key in
 500                                  * a certificate, the CertificateVerify
 501                                  * message is not sent.
 502                                  */
 503                                 s->state=SSL3_ST_SR_FINISHED_A;
 504                                 s->init_num = 0;
 505                                 }
 506                         else
 507                                 {
 508                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 509                                 s->init_num=0;
 510
 511                                 /* We need to get hashes here so if there is
 512                                  * a client cert, it can be verified
 513                                  */
 514                                 s->method->ssl3_enc->cert_verify_mac(s,
 515                                     &(s->s3->finish_dgst1),
 516                                     &(s->s3->tmp.cert_verify_md[0]));
 517                                 s->method->ssl3_enc->cert_verify_mac(s,
 518                                     &(s->s3->finish_dgst2),
 519                                     &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 520                                 }
 521                         break;
 522
 523                 case SSL3_ST_SR_CERT_VRFY_A:
 524                 case SSL3_ST_SR_CERT_VRFY_B:
 525
 526                         /* we should decide if we expected this one */
 527                         ret=ssl3_get_cert_verify(s);
 528                         if (ret <= 0) goto end;
 529
 530                         s->state=SSL3_ST_SR_FINISHED_A;
 531                         s->init_num=0;
 532                         break;
 533
 534                 case SSL3_ST_SR_FINISHED_A:
 535                 case SSL3_ST_SR_FINISHED_B:
 536                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 537                                 SSL3_ST_SR_FINISHED_B);
 538                         if (ret <= 0) goto end;
 539                         if (s->hit)
 540                                 s->state=SSL_ST_OK;
 541 #ifndef OPENSSL_NO_TLSEXT
 542                         else if (s->tlsext_ticket_expected)
 543                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 544 #endif
 545                         else
 546                                 s->state=SSL3_ST_SW_CHANGE_A;
 547                         s->init_num=0;
 548                         break;
 549
 550 #ifndef OPENSSL_NO_TLSEXT
 551                 case SSL3_ST_SW_SESSION_TICKET_A:
 552                 case SSL3_ST_SW_SESSION_TICKET_B:
 553                         ret=ssl3_send_newsession_ticket(s);
 554                         if (ret <= 0) goto end;
 555                         s->state=SSL3_ST_SW_CHANGE_A;
 556                         s->init_num=0;
 557                         break;
 558
 559                 case SSL3_ST_SW_CERT_STATUS_A:
 560                 case SSL3_ST_SW_CERT_STATUS_B:
 561                         ret=ssl3_send_cert_status(s);
 562                         if (ret <= 0) goto end;
 563                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 564                         s->init_num=0;
 565                         break;
 566
 567 #endif
 568
 569                 case SSL3_ST_SW_CHANGE_A:
 570                 case SSL3_ST_SW_CHANGE_B:
 571
 572                         s->session->cipher=s->s3->tmp.new_cipher;
 573                         if (!s->method->ssl3_enc->setup_key_block(s))
 574                                 { ret= -1; goto end; }
 575
 576                         ret=ssl3_send_change_cipher_spec(s,
 577                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 578
 579                         if (ret <= 0) goto end;
 580                         s->state=SSL3_ST_SW_FINISHED_A;
 581                         s->init_num=0;
 582
 583                         if (!s->method->ssl3_enc->change_cipher_state(s,
 584                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 585                                 {
 586                                 ret= -1;
 587                                 goto end;
 588                                 }
 589
 590                         break;
 591
 592                 case SSL3_ST_SW_FINISHED_A:
 593                 case SSL3_ST_SW_FINISHED_B:
 594                         ret=ssl3_send_finished(s,
 595                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 596                                 s->method->ssl3_enc->server_finished_label,
 597                                 s->method->ssl3_enc->server_finished_label_len);
 598                         if (ret <= 0) goto end;
 599                         s->state=SSL3_ST_SW_FLUSH;
 600                         if (s->hit)
 601                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 602                         else
 603                                 s->s3->tmp.next_state=SSL_ST_OK;
 604                         s->init_num=0;
 605                         break;
 606
 607                 case SSL_ST_OK:
 608                         /* clean a few things up */
 609                         ssl3_cleanup_key_block(s);
 610
 611                         BUF_MEM_free(s->init_buf);
 612                         s->init_buf=NULL;
 613
 614                         /* remove buffering on output */
 615                         ssl_free_wbio_buffer(s);
 616
 617                         s->init_num=0;
 618
 619                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 620                                 {
 621                                 /* actually not necessarily a 'new' session unless
 622                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 623
 624                                 s->new_session=0;
 625
 626                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 627
 628                                 s->ctx->stats.sess_accept_good++;
 629                                 /* s->server=1; */
 630                                 s->handshake_func=ssl3_accept;
 631
 632                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 633                                 }
 634
 635                         ret = 1;
 636                         goto end;
 637                         /* break; */
 638
 639                 default:
 640                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 641                         ret= -1;
 642                         goto end;
 643                         /* break; */
 644                         }
 645
 646                 if (!s->s3->tmp.reuse_message && !skip)
 647                         {
 648                         if (s->debug)
 649                                 {
 650                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 651                                         goto end;
 652                                 }
 653
 654
 655                         if ((cb != NULL) && (s->state != state))
 656                                 {
 657                                 new_state=s->state;
 658                                 s->state=state;
 659                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 660                                 s->state=new_state;
 661                                 }
 662                         }
 663                 skip=0;
 664                 }
 665 end:
 666         /* BIO_flush(s->wbio); */
 667
 668         s->in_handshake--;
 669         if (cb != NULL)
 670                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 671         return(ret);
 672         }
 673
 674 int ssl3_send_hello_request(SSL *s)
 675         {
 676         unsigned char *p;
 677
 678         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 679                 {
 680                 p=(unsigned char *)s->init_buf->data;
 681                 *(p++)=SSL3_MT_HELLO_REQUEST;
 682                 *(p++)=0;
 683                 *(p++)=0;
 684                 *(p++)=0;
 685
 686                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 687                 /* number of bytes to write */
 688                 s->init_num=4;
 689                 s->init_off=0;
 690                 }
 691
 692         /* SSL3_ST_SW_HELLO_REQ_B */
 693         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 694         }
 695
 696 int ssl3_check_client_hello(SSL *s)
 697         {
 698         int ok;
 699         long n;
 700
 701         /* We only allow the client to restart the handshake once per
 702          * negotiation. */
 703         if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
 704                 {
 705                 SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
 706                 return -1;
 707                 }
 708
 709         /* this function is called when we really expect a Certificate message,
 710          * so permit appropriate message length */
 711         n=s->method->ssl_get_message(s,
 712                 SSL3_ST_SR_CERT_A,
 713                 SSL3_ST_SR_CERT_B,
 714                 -1,
 715                 s->max_cert_list,
 716                 &ok);
 717         if (!ok) return((int)n);
 718         s->s3->tmp.reuse_message = 1;
 719         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 720                 {
 721                 /* Throw away what we have done so far in the current handshake,
 722                  * which will now be aborted. (A full SSL_clear would be too much.) */
 723 #ifndef OPENSSL_NO_DH
 724                 if (s->s3->tmp.dh != NULL)
 725                         {
 726                         DH_free(s->s3->tmp.dh);
 727                         s->s3->tmp.dh = NULL;
 728                         }
 729 #endif
 730 #ifndef OPENSSL_NO_ECDH
 731                 if (s->s3->tmp.ecdh != NULL)
 732                         {
 733                         EC_KEY_free(s->s3->tmp.ecdh);
 734                         s->s3->tmp.ecdh = NULL;
 735                         }
 736 #endif
 737                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
 738                 return 2;
 739                 }
 740         return 1;
 741 }
 742
 743 int ssl3_get_client_hello(SSL *s)
 744         {
 745         int i,j,ok,al,ret= -1;
 746         unsigned int cookie_len;
 747         long n;
 748         unsigned long id;
 749         unsigned char *p,*d,*q;
 750         SSL_CIPHER *c;
 751 #ifndef OPENSSL_NO_COMP
 752         SSL_COMP *comp=NULL;
 753 #endif
 754         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 755
 756         /* We do this so that we will respond with our native type.
 757          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 758          * This down switching should be handled by a different method.
 759          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 760          * TLSv1.
 761          */
 762         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 763                 {
 764                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 765                 }
 766         s->first_packet=1;
 767         n=s->method->ssl_get_message(s,
 768                 SSL3_ST_SR_CLNT_HELLO_B,
 769                 SSL3_ST_SR_CLNT_HELLO_C,
 770                 SSL3_MT_CLIENT_HELLO,
 771                 SSL3_RT_MAX_PLAIN_LENGTH,
 772                 &ok);
 773
 774         if (!ok) return((int)n);
 775         s->first_packet=0;
 776         d=p=(unsigned char *)s->init_msg;
 777
 778         /* use version from inside client hello, not from record header
 779          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 780         s->client_version=(((int)p[0])<<8)|(int)p[1];
 781         p+=2;
 782
 783         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 784             (s->version != DTLS1_VERSION && s->client_version < s->version))
 785                 {
 786                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 787                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 788                         {
 789                         /* similar to ssl3_get_record, send alert using remote version number */
 790                         s->version = s->client_version;
 791                         }
 792                 al = SSL_AD_PROTOCOL_VERSION;
 793                 goto f_err;
 794                 }
 795
 796         /* If we require cookies and this ClientHello doesn't
 797          * contain one, just return since we do not want to
 798          * allocate any memory yet. So check cookie length...
 799          */
 800         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
 801                 {
 802                 unsigned int session_length, cookie_length;
 803
 804                 session_length = *(p + SSL3_RANDOM_SIZE);
 805                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
 806
 807                 if (cookie_length == 0)
 808                         return 1;
 809                 }
 810
 811         /* load the client random */
 812         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 813         p+=SSL3_RANDOM_SIZE;
 814
 815         /* get the session-id */
 816         j= *(p++);
 817
 818         s->hit=0;
 819         /* Versions before 0.9.7 always allow session reuse during renegotiation
 820          * (i.e. when s->new_session is true), option
 821          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
 822          * Maybe this optional behaviour should always have been the default,
 823          * but we cannot safely change the default behaviour (or new applications
 824          * might be written that become totally unsecure when compiled with
 825          * an earlier library version)
 826          */
 827         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 828                 {
 829                 if (!ssl_get_new_session(s,1))
 830                         goto err;
 831                 }
 832         else
 833                 {
 834                 i=ssl_get_prev_session(s, p, j, d + n);
 835                 if (i == 1)
 836                         { /* previous session */
 837                         s->hit=1;
 838                         }
 839                 else if (i == -1)
 840                         goto err;
 841                 else /* i == 0 */
 842                         {
 843                         if (!ssl_get_new_session(s,1))
 844                                 goto err;
 845                         }
 846                 }
 847
 848         p+=j;
 849
 850         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
 851                 {
 852                 /* cookie stuff */
 853                 cookie_len = *(p++);
 854
 855                 /*
 856                  * The ClientHello may contain a cookie even if the
 857                  * HelloVerify message has not been sent--make sure that it
 858                  * does not cause an overflow.
 859                  */
 860                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
 861                         {
 862                         /* too much data */
 863                         al = SSL_AD_DECODE_ERROR;
 864                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 865                         goto f_err;
 866                         }
 867
 868                 /* verify the cookie if appropriate option is set. */
 869                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 870                         cookie_len > 0)
 871                         {
 872                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
 873
 874                         if ( s->ctx->app_verify_cookie_cb != NULL)
 875                                 {
 876                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
 877                                         cookie_len) == 0)
 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                                 /* else cookie verification succeeded */
 885                                 }
 886                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
 887                                                   s->d1->cookie_len) != 0) /* default verification */
 888                                 {
 889                                         al=SSL_AD_HANDSHAKE_FAILURE;
 890                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 891                                                 SSL_R_COOKIE_MISMATCH);
 892                                         goto f_err;
 893                                 }
 894
 895                         ret = 2;
 896                         }
 897
 898                 p += cookie_len;
 899                 }
 900
 901         n2s(p,i);
 902         if ((i == 0) && (j != 0))
 903                 {
 904                 /* we need a cipher if we are not resuming a session */
 905                 al=SSL_AD_ILLEGAL_PARAMETER;
 906                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 907                 goto f_err;
 908                 }
 909         if ((p+i) >= (d+n))
 910                 {
 911                 /* not enough data */
 912                 al=SSL_AD_DECODE_ERROR;
 913                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 914                 goto f_err;
 915                 }
 916         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 917                 == NULL))
 918                 {
 919                 goto err;
 920                 }
 921         p+=i;
 922
 923         /* If it is a hit, check that the cipher is in the list */
 924         if ((s->hit) && (i > 0))
 925                 {
 926                 j=0;
 927                 id=s->session->cipher->id;
 928
 929 #ifdef CIPHER_DEBUG
 930                 printf("client sent %d ciphers\n",sk_num(ciphers));
 931 #endif
 932                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 933                         {
 934                         c=sk_SSL_CIPHER_value(ciphers,i);
 935 #ifdef CIPHER_DEBUG
 936                         printf("client [%2d of %2d]:%s\n",
 937                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 938 #endif
 939                         if (c->id == id)
 940                                 {
 941                                 j=1;
 942                                 break;
 943                                 }
 944                         }
 945 /* Disabled because it can be used in a ciphersuite downgrade
 946  * attack: CVE-2010-4180.
 947  */
 948 #if 0
 949                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 950                         {
 951                         /* Special case as client bug workaround: the previously used cipher may
 952                          * not be in the current list, the client instead might be trying to
 953                          * continue using a cipher that before wasn't chosen due to server
 954                          * preferences.  We'll have to reject the connection if the cipher is not
 955                          * enabled, though. */
 956                         c = sk_SSL_CIPHER_value(ciphers, 0);
 957                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
 958                                 {
 959                                 s->session->cipher = c;
 960                                 j = 1;
 961                                 }
 962                         }
 963 #endif
 964                 if (j == 0)
 965                         {
 966                         /* we need to have the cipher in the cipher
 967                          * list if we are asked to reuse it */
 968                         al=SSL_AD_ILLEGAL_PARAMETER;
 969                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 970                         goto f_err;
 971                         }
 972                 }
 973
 974         /* compression */
 975         i= *(p++);
 976         if ((p+i) > (d+n))
 977                 {
 978                 /* not enough data */
 979                 al=SSL_AD_DECODE_ERROR;
 980                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 981                 goto f_err;
 982                 }
 983         q=p;
 984         for (j=0; j<i; j++)
 985                 {
 986                 if (p[j] == 0) break;
 987                 }
 988
 989         p+=i;
 990         if (j >= i)
 991                 {
 992                 /* no compress */
 993                 al=SSL_AD_DECODE_ERROR;
 994                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 995                 goto f_err;
 996                 }
 997
 998 #ifndef OPENSSL_NO_TLSEXT
 999         /* TLS extensions*/
1000         if (s->version >= SSL3_VERSION)
1001                 {
1002                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1003                         {
1004                         /* 'al' set by ssl_parse_clienthello_tlsext */
1005                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1006                         goto f_err;
1007                         }
1008                 }
1009                 if (ssl_check_clienthello_tlsext(s) <= 0) {
1010                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1011                         goto err;
1012                 }
1013 #endif
1014         /* Worst case, we will use the NULL compression, but if we have other
1015          * options, we will now look for them.  We have i-1 compression
1016          * algorithms from the client, starting at q. */
1017         s->s3->tmp.new_compression=NULL;
1018 #ifndef OPENSSL_NO_COMP
1019         if (s->ctx->comp_methods != NULL)
1020                 { /* See if we have a match */
1021                 int m,nn,o,v,done=0;
1022
1023                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1024                 for (m=0; m<nn; m++)
1025                         {
1026                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1027                         v=comp->id;
1028                         for (o=0; o<i; o++)
1029                                 {
1030                                 if (v == q[o])
1031                                         {
1032                                         done=1;
1033                                         break;
1034                                         }
1035                                 }
1036                         if (done) break;
1037                         }
1038                 if (done)
1039                         s->s3->tmp.new_compression=comp;
1040                 else
1041                         comp=NULL;
1042                 }
1043 #endif
1044
1045         /* TLS does not mind if there is extra stuff */
1046 #if 0   /* SSL 3.0 does not mind either, so we should disable this test
1047          * (was enabled in 0.9.6d through 0.9.6j and 0.9.7 through 0.9.7b,
1048          * in earlier SSLeay/OpenSSL releases this test existed but was buggy) */
1049         if (s->version == SSL3_VERSION)
1050                 {
1051                 if (p < (d+n))
1052                         {
1053                         /* wrong number of bytes,
1054                          * there could be more to follow */
1055                         al=SSL_AD_DECODE_ERROR;
1056                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1057                         goto f_err;
1058                         }
1059                 }
1060 #endif
1061
1062         /* Given s->session->ciphers and SSL_get_ciphers, we must
1063          * pick a cipher */
1064
1065         if (!s->hit)
1066                 {
1067 #ifdef OPENSSL_NO_COMP
1068                 s->session->compress_meth=0;
1069 #else
1070                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1071 #endif
1072                 if (s->session->ciphers != NULL)
1073                         sk_SSL_CIPHER_free(s->session->ciphers);
1074                 s->session->ciphers=ciphers;
1075                 if (ciphers == NULL)
1076                         {
1077                         al=SSL_AD_ILLEGAL_PARAMETER;
1078                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1079                         goto f_err;
1080                         }
1081                 ciphers=NULL;
1082                 c=ssl3_choose_cipher(s,s->session->ciphers,
1083                                      SSL_get_ciphers(s));
1084
1085                 if (c == NULL)
1086                         {
1087                         al=SSL_AD_HANDSHAKE_FAILURE;
1088                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1089                         goto f_err;
1090                         }
1091                 s->s3->tmp.new_cipher=c;
1092                 }
1093         else
1094                 {
1095                 /* Session-id reuse */
1096 #ifdef REUSE_CIPHER_BUG
1097                 STACK_OF(SSL_CIPHER) *sk;
1098                 SSL_CIPHER *nc=NULL;
1099                 SSL_CIPHER *ec=NULL;
1100
1101                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1102                         {
1103                         sk=s->session->ciphers;
1104                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1105                                 {
1106                                 c=sk_SSL_CIPHER_value(sk,i);
1107                                 if (c->algorithms & SSL_eNULL)
1108                                         nc=c;
1109                                 if (SSL_C_IS_EXPORT(c))
1110                                         ec=c;
1111                                 }
1112                         if (nc != NULL)
1113                                 s->s3->tmp.new_cipher=nc;
1114                         else if (ec != NULL)
1115                                 s->s3->tmp.new_cipher=ec;
1116                         else
1117                                 s->s3->tmp.new_cipher=s->session->cipher;
1118                         }
1119                 else
1120 #endif
1121                 s->s3->tmp.new_cipher=s->session->cipher;
1122                 }
1123
1124         /* we now have the following setup.
1125          * client_random
1126          * cipher_list          - our prefered list of ciphers
1127          * ciphers              - the clients prefered list of ciphers
1128          * compression          - basically ignored right now
1129          * ssl version is set   - sslv3
1130          * s->session           - The ssl session has been setup.
1131          * s->hit               - session reuse flag
1132          * s->tmp.new_cipher    - the new cipher to use.
1133          */
1134
1135         if (ret < 0) ret=1;
1136         if (0)
1137                 {
1138 f_err:
1139                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1140                 }
1141 err:
1142         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1143         return(ret);
1144         }
1145
1146 int ssl3_send_server_hello(SSL *s)
1147         {
1148         unsigned char *buf;
1149         unsigned char *p,*d;
1150         int i,sl;
1151         unsigned long l,Time;
1152
1153         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1154                 {
1155                 buf=(unsigned char *)s->init_buf->data;
1156                 p=s->s3->server_random;
1157                 Time=(unsigned long)time(NULL);                 /* Time */
1158                 l2n(Time,p);
1159                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1160                         return -1;
1161                 /* Do the message type and length last */
1162                 d=p= &(buf[4]);
1163
1164                 *(p++)=s->version>>8;
1165                 *(p++)=s->version&0xff;
1166
1167                 /* Random stuff */
1168                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1169                 p+=SSL3_RANDOM_SIZE;
1170
1171                 /* now in theory we have 3 options to sending back the
1172                  * session id.  If it is a re-use, we send back the
1173                  * old session-id, if it is a new session, we send
1174                  * back the new session-id or we send back a 0 length
1175                  * session-id if we want it to be single use.
1176                  * Currently I will not implement the '0' length session-id
1177                  * 12-Jan-98 - I'll now support the '0' length stuff.
1178                  *
1179                  * We also have an additional case where stateless session
1180                  * resumption is successful: we always send back the old
1181                  * session id. In this case s->hit is non zero: this can
1182                  * only happen if stateless session resumption is succesful
1183                  * if session caching is disabled so existing functionality
1184                  * is unaffected.
1185                  */
1186                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1187                         && !s->hit)
1188                         s->session->session_id_length=0;
1189
1190                 sl=s->session->session_id_length;
1191                 if (sl > (int)sizeof(s->session->session_id))
1192                         {
1193                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1194                         return -1;
1195                         }
1196                 *(p++)=sl;
1197                 memcpy(p,s->session->session_id,sl);
1198                 p+=sl;
1199
1200                 /* put the cipher */
1201                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1202                 p+=i;
1203
1204                 /* put the compression method */
1205 #ifdef OPENSSL_NO_COMP
1206                         *(p++)=0;
1207 #else
1208                 if (s->s3->tmp.new_compression == NULL)
1209                         *(p++)=0;
1210                 else
1211                         *(p++)=s->s3->tmp.new_compression->id;
1212 #endif
1213 #ifndef OPENSSL_NO_TLSEXT
1214                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1215                         {
1216                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1217                         return -1;
1218                         }
1219 #endif
1220                 /* do the header */
1221                 l=(p-d);
1222                 d=buf;
1223                 *(d++)=SSL3_MT_SERVER_HELLO;
1224                 l2n3(l,d);
1225
1226                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1227                 /* number of bytes to write */
1228                 s->init_num=p-buf;
1229                 s->init_off=0;
1230                 }
1231
1232         /* SSL3_ST_SW_SRVR_HELLO_B */
1233         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1234         }
1235
1236 int ssl3_send_server_done(SSL *s)
1237         {
1238         unsigned char *p;
1239
1240         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1241                 {
1242                 p=(unsigned char *)s->init_buf->data;
1243
1244                 /* do the header */
1245                 *(p++)=SSL3_MT_SERVER_DONE;
1246                 *(p++)=0;
1247                 *(p++)=0;
1248                 *(p++)=0;
1249
1250                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1251                 /* number of bytes to write */
1252                 s->init_num=4;
1253                 s->init_off=0;
1254                 }
1255
1256         /* SSL3_ST_SW_SRVR_DONE_B */
1257         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1258         }
1259
1260 int ssl3_send_server_key_exchange(SSL *s)
1261         {
1262 #ifndef OPENSSL_NO_RSA
1263         unsigned char *q;
1264         int j,num;
1265         RSA *rsa;
1266         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1267         unsigned int u;
1268 #endif
1269 #ifndef OPENSSL_NO_DH
1270         DH *dh=NULL,*dhp;
1271 #endif
1272 #ifndef OPENSSL_NO_ECDH
1273         EC_KEY *ecdh=NULL, *ecdhp;
1274         unsigned char *encodedPoint = NULL;
1275         int encodedlen = 0;
1276         int curve_id = 0;
1277         BN_CTX *bn_ctx = NULL;
1278 #endif
1279         EVP_PKEY *pkey;
1280         unsigned char *p,*d;
1281         int al,i;
1282         unsigned long type;
1283         int n;
1284         CERT *cert;
1285         BIGNUM *r[4];
1286         int nr[4],kn;
1287         BUF_MEM *buf;
1288         EVP_MD_CTX md_ctx;
1289
1290         EVP_MD_CTX_init(&md_ctx);
1291         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1292                 {
1293                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1294                 cert=s->cert;
1295
1296                 buf=s->init_buf;
1297
1298                 r[0]=r[1]=r[2]=r[3]=NULL;
1299                 n=0;
1300 #ifndef OPENSSL_NO_RSA
1301                 if (type & SSL_kRSA)
1302                         {
1303                         rsa=cert->rsa_tmp;
1304                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1305                                 {
1306                                 rsa=s->cert->rsa_tmp_cb(s,
1307                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1308                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1309                                 if(rsa == NULL)
1310                                 {
1311                                         al=SSL_AD_HANDSHAKE_FAILURE;
1312                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1313                                         goto f_err;
1314                                 }
1315                                 RSA_up_ref(rsa);
1316                                 cert->rsa_tmp=rsa;
1317                                 }
1318                         if (rsa == NULL)
1319                                 {
1320                                 al=SSL_AD_HANDSHAKE_FAILURE;
1321                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1322                                 goto f_err;
1323                                 }
1324                         r[0]=rsa->n;
1325                         r[1]=rsa->e;
1326                         s->s3->tmp.use_rsa_tmp=1;
1327                         }
1328                 else
1329 #endif
1330 #ifndef OPENSSL_NO_DH
1331                         if (type & SSL_kEDH)
1332                         {
1333                         dhp=cert->dh_tmp;
1334                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1335                                 dhp=s->cert->dh_tmp_cb(s,
1336                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1337                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1338                         if (dhp == NULL)
1339                                 {
1340                                 al=SSL_AD_HANDSHAKE_FAILURE;
1341                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1342                                 goto f_err;
1343                                 }
1344
1345                         if (s->s3->tmp.dh != NULL)
1346                                 {
1347                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1348                                 goto err;
1349                                 }
1350
1351                         if ((dh=DHparams_dup(dhp)) == NULL)
1352                                 {
1353                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1354                                 goto err;
1355                                 }
1356
1357                         s->s3->tmp.dh=dh;
1358                         if ((dhp->pub_key == NULL ||
1359                              dhp->priv_key == NULL ||
1360                              (s->options & SSL_OP_SINGLE_DH_USE)))
1361                                 {
1362                                 if(!DH_generate_key(dh))
1363                                     {
1364                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1365                                            ERR_R_DH_LIB);
1366                                     goto err;
1367                                     }
1368                                 }
1369                         else
1370                                 {
1371                                 dh->pub_key=BN_dup(dhp->pub_key);
1372                                 dh->priv_key=BN_dup(dhp->priv_key);
1373                                 if ((dh->pub_key == NULL) ||
1374                                         (dh->priv_key == NULL))
1375                                         {
1376                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1377                                         goto err;
1378                                         }
1379                                 }
1380                         r[0]=dh->p;
1381                         r[1]=dh->g;
1382                         r[2]=dh->pub_key;
1383                         }
1384                 else
1385 #endif
1386 #ifndef OPENSSL_NO_ECDH
1387                         if (type & SSL_kECDHE)
1388                         {
1389                         const EC_GROUP *group;
1390
1391                         ecdhp=cert->ecdh_tmp;
1392                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1393                                 {
1394                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1395                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1396                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1397                                 }
1398                         if (ecdhp == NULL)
1399                                 {
1400                                 al=SSL_AD_HANDSHAKE_FAILURE;
1401                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1402                                 goto f_err;
1403                                 }
1404
1405                         if (s->s3->tmp.ecdh != NULL)
1406                                 {
1407                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1408                                 goto err;
1409                                 }
1410
1411                         /* Duplicate the ECDH structure. */
1412                         if (ecdhp == NULL)
1413                                 {
1414                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1415                                 goto err;
1416                                 }
1417                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1418                                 {
1419                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1420                                 goto err;
1421                                 }
1422
1423                         s->s3->tmp.ecdh=ecdh;
1424                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1425                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1426                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1427                                 {
1428                                 if(!EC_KEY_generate_key(ecdh))
1429                                     {
1430                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1431                                     goto err;
1432                                     }
1433                                 }
1434
1435                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1436                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1437                             (EC_KEY_get0_private_key(ecdh) == NULL))
1438                                 {
1439                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1440                                 goto err;
1441                                 }
1442
1443                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1444                             (EC_GROUP_get_degree(group) > 163))
1445                                 {
1446                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1447                                 goto err;
1448                                 }
1449
1450                         /* XXX: For now, we only support ephemeral ECDH
1451                          * keys over named (not generic) curves. For
1452                          * supported named curves, curve_id is non-zero.
1453                          */
1454                         if ((curve_id =
1455                             nid2curve_id(EC_GROUP_get_curve_name(group)))
1456                             == 0)
1457                                 {
1458                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1459                                 goto err;
1460                                 }
1461
1462                         /* Encode the public key.
1463                          * First check the size of encoding and
1464                          * allocate memory accordingly.
1465                          */
1466                         encodedlen = EC_POINT_point2oct(group,
1467                             EC_KEY_get0_public_key(ecdh),
1468                             POINT_CONVERSION_UNCOMPRESSED,
1469                             NULL, 0, NULL);
1470
1471                         encodedPoint = (unsigned char *)
1472                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1473                         bn_ctx = BN_CTX_new();
1474                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1475                                 {
1476                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1477                                 goto err;
1478                                 }
1479
1480
1481                         encodedlen = EC_POINT_point2oct(group,
1482                             EC_KEY_get0_public_key(ecdh),
1483                             POINT_CONVERSION_UNCOMPRESSED,
1484                             encodedPoint, encodedlen, bn_ctx);
1485
1486                         if (encodedlen == 0)
1487                                 {
1488                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1489                                 goto err;
1490                                 }
1491
1492                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1493
1494                         /* XXX: For now, we only support named (not
1495                          * generic) curves in ECDH ephemeral key exchanges.
1496                          * In this situation, we need four additional bytes
1497                          * to encode the entire ServerECDHParams
1498                          * structure.
1499                          */
1500                         n = 4 + encodedlen;
1501
1502                         /* We'll generate the serverKeyExchange message
1503                          * explicitly so we can set these to NULLs
1504                          */
1505                         r[0]=NULL;
1506                         r[1]=NULL;
1507                         r[2]=NULL;
1508                         r[3]=NULL;
1509                         }
1510                 else
1511 #endif /* !OPENSSL_NO_ECDH */
1512                         {
1513                         al=SSL_AD_HANDSHAKE_FAILURE;
1514                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1515                         goto f_err;
1516                         }
1517                 for (i=0; r[i] != NULL; i++)
1518                         {
1519                         nr[i]=BN_num_bytes(r[i]);
1520                         n+=2+nr[i];
1521                         }
1522
1523                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1524                         {
1525                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1526                                 == NULL)
1527                                 {
1528                                 al=SSL_AD_DECODE_ERROR;
1529                                 goto f_err;
1530                                 }
1531                         kn=EVP_PKEY_size(pkey);
1532                         }
1533                 else
1534                         {
1535                         pkey=NULL;
1536                         kn=0;
1537                         }
1538
1539                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1540                         {
1541                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1542                         goto err;
1543                         }
1544                 d=(unsigned char *)s->init_buf->data;
1545                 p= &(d[4]);
1546
1547                 for (i=0; r[i] != NULL; i++)
1548                         {
1549                         s2n(nr[i],p);
1550                         BN_bn2bin(r[i],p);
1551                         p+=nr[i];
1552                         }
1553
1554 #ifndef OPENSSL_NO_ECDH
1555                 if (type & SSL_kECDHE)
1556                         {
1557                         /* XXX: For now, we only support named (not generic) curves.
1558                          * In this situation, the serverKeyExchange message has:
1559                          * [1 byte CurveType], [2 byte CurveName]
1560                          * [1 byte length of encoded point], followed by
1561                          * the actual encoded point itself
1562                          */
1563                         *p = NAMED_CURVE_TYPE;
1564                         p += 1;
1565                         *p = 0;
1566                         p += 1;
1567                         *p = curve_id;
1568                         p += 1;
1569                         *p = encodedlen;
1570                         p += 1;
1571                         memcpy((unsigned char*)p,
1572                             (unsigned char *)encodedPoint,
1573                             encodedlen);
1574                         OPENSSL_free(encodedPoint);
1575                         encodedPoint = NULL;
1576                         p += encodedlen;
1577                         }
1578 #endif
1579
1580                 /* not anonymous */
1581                 if (pkey != NULL)
1582                         {
1583                         /* n is the length of the params, they start at &(d[4])
1584                          * and p points to the space at the end. */
1585 #ifndef OPENSSL_NO_RSA
1586                         if (pkey->type == EVP_PKEY_RSA)
1587                                 {
1588                                 q=md_buf;
1589                                 j=0;
1590                                 for (num=2; num > 0; num--)
1591                                         {
1592                                         EVP_MD_CTX_set_flags(&md_ctx,
1593                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1594                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1595                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1596                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1597                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1598                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1599                                         EVP_DigestFinal_ex(&md_ctx,q,
1600                                                 (unsigned int *)&i);
1601                                         q+=i;
1602                                         j+=i;
1603                                         }
1604                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1605                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1606                                         {
1607                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1608                                         goto err;
1609                                         }
1610                                 s2n(u,p);
1611                                 n+=u+2;
1612                                 }
1613                         else
1614 #endif
1615 #if !defined(OPENSSL_NO_DSA)
1616                                 if (pkey->type == EVP_PKEY_DSA)
1617                                 {
1618                                 /* lets do DSS */
1619                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1620                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1621                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1622                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1623                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1624                                         (unsigned int *)&i,pkey))
1625                                         {
1626                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1627                                         goto err;
1628                                         }
1629                                 s2n(i,p);
1630                                 n+=i+2;
1631                                 }
1632                         else
1633 #endif
1634 #if !defined(OPENSSL_NO_ECDSA)
1635                                 if (pkey->type == EVP_PKEY_EC)
1636                                 {
1637                                 /* let's do ECDSA */
1638                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1639                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1640                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1641                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1642                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1643                                         (unsigned int *)&i,pkey))
1644                                         {
1645                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1646                                         goto err;
1647                                         }
1648                                 s2n(i,p);
1649                                 n+=i+2;
1650                                 }
1651                         else
1652 #endif
1653                                 {
1654                                 /* Is this error check actually needed? */
1655                                 al=SSL_AD_HANDSHAKE_FAILURE;
1656                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1657                                 goto f_err;
1658                                 }
1659                         }
1660
1661                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1662                 l2n3(n,d);
1663
1664                 /* we should now have things packed up, so lets send
1665                  * it off */
1666                 s->init_num=n+4;
1667                 s->init_off=0;
1668                 }
1669
1670         s->state = SSL3_ST_SW_KEY_EXCH_B;
1671         EVP_MD_CTX_cleanup(&md_ctx);
1672         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1673 f_err:
1674         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1675 err:
1676 #ifndef OPENSSL_NO_ECDH
1677         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1678         BN_CTX_free(bn_ctx);
1679 #endif
1680         EVP_MD_CTX_cleanup(&md_ctx);
1681         return(-1);
1682         }
1683
1684 int ssl3_send_certificate_request(SSL *s)
1685         {
1686         unsigned char *p,*d;
1687         int i,j,nl,off,n;
1688         STACK_OF(X509_NAME) *sk=NULL;
1689         X509_NAME *name;
1690         BUF_MEM *buf;
1691
1692         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1693                 {
1694                 buf=s->init_buf;
1695
1696                 d=p=(unsigned char *)&(buf->data[4]);
1697
1698                 /* get the list of acceptable cert types */
1699                 p++;
1700                 n=ssl3_get_req_cert_type(s,p);
1701                 d[0]=n;
1702                 p+=n;
1703                 n++;
1704
1705                 off=n;
1706                 p+=2;
1707                 n+=2;
1708
1709                 sk=SSL_get_client_CA_list(s);
1710                 nl=0;
1711                 if (sk != NULL)
1712                         {
1713                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1714                                 {
1715                                 name=sk_X509_NAME_value(sk,i);
1716                                 j=i2d_X509_NAME(name,NULL);
1717                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1718                                         {
1719                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1720                                         goto err;
1721                                         }
1722                                 p=(unsigned char *)&(buf->data[4+n]);
1723                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1724                                         {
1725                                         s2n(j,p);
1726                                         i2d_X509_NAME(name,&p);
1727                                         n+=2+j;
1728                                         nl+=2+j;
1729                                         }
1730                                 else
1731                                         {
1732                                         d=p;
1733                                         i2d_X509_NAME(name,&p);
1734                                         j-=2; s2n(j,d); j+=2;
1735                                         n+=j;
1736                                         nl+=j;
1737                                         }
1738                                 }
1739                         }
1740                 /* else no CA names */
1741                 p=(unsigned char *)&(buf->data[4+off]);
1742                 s2n(nl,p);
1743
1744                 d=(unsigned char *)buf->data;
1745                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1746                 l2n3(n,d);
1747
1748                 /* we should now have things packed up, so lets send
1749                  * it off */
1750
1751                 s->init_num=n+4;
1752                 s->init_off=0;
1753 #ifdef NETSCAPE_HANG_BUG
1754                 p=(unsigned char *)s->init_buf->data + s->init_num;
1755
1756                 /* do the header */
1757                 *(p++)=SSL3_MT_SERVER_DONE;
1758                 *(p++)=0;
1759                 *(p++)=0;
1760                 *(p++)=0;
1761                 s->init_num += 4;
1762 #endif
1763
1764                 s->state = SSL3_ST_SW_CERT_REQ_B;
1765                 }
1766
1767         /* SSL3_ST_SW_CERT_REQ_B */
1768         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1769 err:
1770         return(-1);
1771         }
1772
1773 int ssl3_get_client_key_exchange(SSL *s)
1774         {
1775         int i,al,ok;
1776         long n;
1777         unsigned long l;
1778         unsigned char *p;
1779 #ifndef OPENSSL_NO_RSA
1780         RSA *rsa=NULL;
1781         EVP_PKEY *pkey=NULL;
1782 #endif
1783 #ifndef OPENSSL_NO_DH
1784         BIGNUM *pub=NULL;
1785         DH *dh_srvr;
1786 #endif
1787 #ifndef OPENSSL_NO_KRB5
1788         KSSL_ERR kssl_err;
1789 #endif /* OPENSSL_NO_KRB5 */
1790
1791 #ifndef OPENSSL_NO_ECDH
1792         EC_KEY *srvr_ecdh = NULL;
1793         EVP_PKEY *clnt_pub_pkey = NULL;
1794         EC_POINT *clnt_ecpoint = NULL;
1795         BN_CTX *bn_ctx = NULL;
1796 #endif
1797
1798         n=s->method->ssl_get_message(s,
1799                 SSL3_ST_SR_KEY_EXCH_A,
1800                 SSL3_ST_SR_KEY_EXCH_B,
1801                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1802                 2048, /* ??? */
1803                 &ok);
1804
1805         if (!ok) return((int)n);
1806         p=(unsigned char *)s->init_msg;
1807
1808         l=s->s3->tmp.new_cipher->algorithms;
1809
1810 #ifndef OPENSSL_NO_RSA
1811         if (l & SSL_kRSA)
1812                 {
1813                 /* FIX THIS UP EAY EAY EAY EAY */
1814                 if (s->s3->tmp.use_rsa_tmp)
1815                         {
1816                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1817                                 rsa=s->cert->rsa_tmp;
1818                         /* Don't do a callback because rsa_tmp should
1819                          * be sent already */
1820                         if (rsa == NULL)
1821                                 {
1822                                 al=SSL_AD_HANDSHAKE_FAILURE;
1823                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1824                                 goto f_err;
1825
1826                                 }
1827                         }
1828                 else
1829                         {
1830                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1831                         if (    (pkey == NULL) ||
1832                                 (pkey->type != EVP_PKEY_RSA) ||
1833                                 (pkey->pkey.rsa == NULL))
1834                                 {
1835                                 al=SSL_AD_HANDSHAKE_FAILURE;
1836                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1837                                 goto f_err;
1838                                 }
1839                         rsa=pkey->pkey.rsa;
1840                         }
1841
1842                 /* TLS and [incidentally] DTLS, including pre-0.9.8f */
1843                 if (s->version > SSL3_VERSION &&
1844                     s->client_version != DTLS1_BAD_VER)
1845                         {
1846                         n2s(p,i);
1847                         if (n != i+2)
1848                                 {
1849                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1850                                         {
1851                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1852                                         goto err;
1853                                         }
1854                                 else
1855                                         p-=2;
1856                                 }
1857                         else
1858                                 n=i;
1859                         }
1860
1861                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1862
1863                 al = -1;
1864
1865                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1866                         {
1867                         al=SSL_AD_DECODE_ERROR;
1868                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
1869                         }
1870
1871                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1872                         {
1873                         /* The premaster secret must contain the same version number as the
1874                          * ClientHello to detect version rollback attacks (strangely, the
1875                          * protocol does not offer such protection for DH ciphersuites).
1876                          * However, buggy clients exist that send the negotiated protocol
1877                          * version instead if the server does not support the requested
1878                          * protocol version.
1879                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1880                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1881                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1882                                 {
1883                                 al=SSL_AD_DECODE_ERROR;
1884                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1885
1886                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1887                                  * (http://eprint.iacr.org/2003/052/) exploits the version
1888                                  * number check as a "bad version oracle" -- an alert would
1889                                  * reveal that the plaintext corresponding to some ciphertext
1890                                  * made up by the adversary is properly formatted except
1891                                  * that the version number is wrong.  To avoid such attacks,
1892                                  * we should treat this just like any other decryption error. */
1893                                 }
1894                         }
1895
1896                 if (al != -1)
1897                         {
1898                         /* Some decryption failure -- use random value instead as countermeasure
1899                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1900                          * (see RFC 2246, section 7.4.7.1). */
1901                         ERR_clear_error();
1902                         i = SSL_MAX_MASTER_KEY_LENGTH;
1903                         p[0] = s->client_version >> 8;
1904                         p[1] = s->client_version & 0xff;
1905                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
1906                                 goto err;
1907                         }
1908
1909                 s->session->master_key_length=
1910                         s->method->ssl3_enc->generate_master_secret(s,
1911                                 s->session->master_key,
1912                                 p,i);
1913                 OPENSSL_cleanse(p,i);
1914                 }
1915         else
1916 #endif
1917 #ifndef OPENSSL_NO_DH
1918                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1919                 {
1920                 n2s(p,i);
1921                 if (n != i+2)
1922                         {
1923                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1924                                 {
1925                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1926                                 goto err;
1927                                 }
1928                         else
1929                                 {
1930                                 p-=2;
1931                                 i=(int)n;
1932                                 }
1933                         }
1934
1935                 if (n == 0L) /* the parameters are in the cert */
1936                         {
1937                         al=SSL_AD_HANDSHAKE_FAILURE;
1938                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1939                         goto f_err;
1940                         }
1941                 else
1942                         {
1943                         if (s->s3->tmp.dh == NULL)
1944                                 {
1945                                 al=SSL_AD_HANDSHAKE_FAILURE;
1946                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1947                                 goto f_err;
1948                                 }
1949                         else
1950                                 dh_srvr=s->s3->tmp.dh;
1951                         }
1952
1953                 pub=BN_bin2bn(p,i,NULL);
1954                 if (pub == NULL)
1955                         {
1956                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1957                         goto err;
1958                         }
1959
1960                 i=DH_compute_key(p,pub,dh_srvr);
1961
1962                 if (i <= 0)
1963                         {
1964                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1965                         BN_clear_free(pub);
1966                         goto err;
1967                         }
1968
1969                 DH_free(s->s3->tmp.dh);
1970                 s->s3->tmp.dh=NULL;
1971
1972                 BN_clear_free(pub);
1973                 pub=NULL;
1974                 s->session->master_key_length=
1975                         s->method->ssl3_enc->generate_master_secret(s,
1976                                 s->session->master_key,p,i);
1977                 OPENSSL_cleanse(p,i);
1978                 }
1979         else
1980 #endif
1981 #ifndef OPENSSL_NO_KRB5
1982         if (l & SSL_kKRB5)
1983                 {
1984                 krb5_error_code         krb5rc;
1985                 krb5_data               enc_ticket;
1986                 krb5_data               authenticator;
1987                 krb5_data               enc_pms;
1988                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
1989                 EVP_CIPHER_CTX          ciph_ctx;
1990                 EVP_CIPHER              *enc = NULL;
1991                 unsigned char           iv[EVP_MAX_IV_LENGTH];
1992                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
1993                                                + EVP_MAX_BLOCK_LENGTH];
1994                 int                     padl, outl;
1995                 krb5_timestamp          authtime = 0;
1996                 krb5_ticket_times       ttimes;
1997
1998                 EVP_CIPHER_CTX_init(&ciph_ctx);
1999
2000                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2001
2002                 n2s(p,i);
2003                 enc_ticket.length = i;
2004
2005                 if (n < (int)enc_ticket.length + 6)
2006                         {
2007                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2008                                 SSL_R_DATA_LENGTH_TOO_LONG);
2009                         goto err;
2010                         }
2011
2012                 enc_ticket.data = (char *)p;
2013                 p+=enc_ticket.length;
2014
2015                 n2s(p,i);
2016                 authenticator.length = i;
2017
2018                 if (n < (int)(enc_ticket.length + authenticator.length) + 6)
2019                         {
2020                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2021                                 SSL_R_DATA_LENGTH_TOO_LONG);
2022                         goto err;
2023                         }
2024
2025                 authenticator.data = (char *)p;
2026                 p+=authenticator.length;
2027
2028                 n2s(p,i);
2029                 enc_pms.length = i;
2030                 enc_pms.data = (char *)p;
2031                 p+=enc_pms.length;
2032
2033                 /* Note that the length is checked again below,
2034                 ** after decryption
2035                 */
2036                 if(enc_pms.length > sizeof pms)
2037                         {
2038                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2039                                SSL_R_DATA_LENGTH_TOO_LONG);
2040                         goto err;
2041                         }
2042
2043                 if (n != (long)(enc_ticket.length + authenticator.length +
2044                                                 enc_pms.length + 6))
2045                         {
2046                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2047                                 SSL_R_DATA_LENGTH_TOO_LONG);
2048                         goto err;
2049                         }
2050
2051                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2052                                         &kssl_err)) != 0)
2053                         {
2054 #ifdef KSSL_DEBUG
2055                         printf("kssl_sget_tkt rtn %d [%d]\n",
2056                                 krb5rc, kssl_err.reason);
2057                         if (kssl_err.text)
2058                                 printf("kssl_err text= %s\n", kssl_err.text);
2059 #endif  /* KSSL_DEBUG */
2060                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2061                                 kssl_err.reason);
2062                         goto err;
2063                         }
2064
2065                 /*  Note: no authenticator is not considered an error,
2066                 **  but will return authtime == 0.
2067                 */
2068                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2069                                         &authtime, &kssl_err)) != 0)
2070                         {
2071 #ifdef KSSL_DEBUG
2072                         printf("kssl_check_authent rtn %d [%d]\n",
2073                                 krb5rc, kssl_err.reason);
2074                         if (kssl_err.text)
2075                                 printf("kssl_err text= %s\n", kssl_err.text);
2076 #endif  /* KSSL_DEBUG */
2077                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2078                                 kssl_err.reason);
2079                         goto err;
2080                         }
2081
2082                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2083                         {
2084                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2085                         goto err;
2086                         }
2087
2088 #ifdef KSSL_DEBUG
2089                 kssl_ctx_show(kssl_ctx);
2090 #endif  /* KSSL_DEBUG */
2091
2092                 enc = kssl_map_enc(kssl_ctx->enctype);
2093                 if (enc == NULL)
2094                     goto err;
2095
2096                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2097
2098                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2099                         {
2100                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2101                                 SSL_R_DECRYPTION_FAILED);
2102                         goto err;
2103                         }
2104                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2105                                         (unsigned char *)enc_pms.data, enc_pms.length))
2106                         {
2107                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2108                                 SSL_R_DECRYPTION_FAILED);
2109                         goto err;
2110                         }
2111                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2112                         {
2113                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2114                                 SSL_R_DATA_LENGTH_TOO_LONG);
2115                         goto err;
2116                         }
2117                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2118                         {
2119                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2120                                 SSL_R_DECRYPTION_FAILED);
2121                         goto err;
2122                         }
2123                 outl += padl;
2124                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2125                         {
2126                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2127                                 SSL_R_DATA_LENGTH_TOO_LONG);
2128                         goto err;
2129                         }
2130                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2131                     {
2132                     /* The premaster secret must contain the same version number as the
2133                      * ClientHello to detect version rollback attacks (strangely, the
2134                      * protocol does not offer such protection for DH ciphersuites).
2135                      * However, buggy clients exist that send random bytes instead of
2136                      * the protocol version.
2137                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2138                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2139                      */
2140                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2141                         {
2142                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2143                                SSL_AD_DECODE_ERROR);
2144                         goto err;
2145                         }
2146                     }
2147
2148                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2149
2150                 s->session->master_key_length=
2151                         s->method->ssl3_enc->generate_master_secret(s,
2152                                 s->session->master_key, pms, outl);
2153
2154                 if (kssl_ctx->client_princ)
2155                         {
2156                         size_t len = strlen(kssl_ctx->client_princ);
2157                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2158                                 {
2159                                 s->session->krb5_client_princ_len = len;
2160                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2161                                 }
2162                         }
2163
2164
2165                 /*  Was doing kssl_ctx_free() here,
2166                 **  but it caused problems for apache.
2167                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2168                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2169                 */
2170                 }
2171         else
2172 #endif  /* OPENSSL_NO_KRB5 */
2173
2174 #ifndef OPENSSL_NO_ECDH
2175                 if ((l & SSL_kECDH) || (l & SSL_kECDHE))
2176                 {
2177                 int ret = 1;
2178                 int field_size = 0;
2179                 const EC_KEY   *tkey;
2180                 const EC_GROUP *group;
2181                 const BIGNUM *priv_key;
2182
2183                 /* initialize structures for server's ECDH key pair */
2184                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2185                         {
2186                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2187                             ERR_R_MALLOC_FAILURE);
2188                         goto err;
2189                         }
2190
2191                 /* Let's get server private key and group information */
2192                 if (l & SSL_kECDH)
2193                         {
2194                         /* use the certificate */
2195                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2196                         }
2197                 else
2198                         {
2199                         /* use the ephermeral values we saved when
2200                          * generating the ServerKeyExchange msg.
2201                          */
2202                         tkey = s->s3->tmp.ecdh;
2203                         }
2204
2205                 group    = EC_KEY_get0_group(tkey);
2206                 priv_key = EC_KEY_get0_private_key(tkey);
2207
2208                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2209                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2210                         {
2211                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2212                                ERR_R_EC_LIB);
2213                         goto err;
2214                         }
2215
2216                 /* Let's get client's public key */
2217                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2218                         {
2219                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2220                             ERR_R_MALLOC_FAILURE);
2221                         goto err;
2222                         }
2223
2224                 if (n == 0L)
2225                         {
2226                         /* Client Publickey was in Client Certificate */
2227
2228                          if (l & SSL_kECDHE)
2229                                  {
2230                                  al=SSL_AD_HANDSHAKE_FAILURE;
2231                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2232                                  goto f_err;
2233                                  }
2234                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2235                             == NULL) ||
2236                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2237                                 {
2238                                 /* XXX: For now, we do not support client
2239                                  * authentication using ECDH certificates
2240                                  * so this branch (n == 0L) of the code is
2241                                  * never executed. When that support is
2242                                  * added, we ought to ensure the key
2243                                  * received in the certificate is
2244                                  * authorized for key agreement.
2245                                  * ECDH_compute_key implicitly checks that
2246                                  * the two ECDH shares are for the same
2247                                  * group.
2248                                  */
2249                                 al=SSL_AD_HANDSHAKE_FAILURE;
2250                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2251                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2252                                 goto f_err;
2253                                 }
2254
2255                         if (EC_POINT_copy(clnt_ecpoint,
2256                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2257                                 {
2258                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2259                                         ERR_R_EC_LIB);
2260                                 goto err;
2261                                 }
2262                         ret = 2; /* Skip certificate verify processing */
2263                         }
2264                 else
2265                         {
2266                         /* Get client's public key from encoded point
2267                          * in the ClientKeyExchange message.
2268                          */
2269                         if ((bn_ctx = BN_CTX_new()) == NULL)
2270                                 {
2271                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2272                                     ERR_R_MALLOC_FAILURE);
2273                                 goto err;
2274                                 }
2275
2276                         /* Get encoded point length */
2277                         i = *p;
2278                         p += 1;
2279                         if (n != 1 + i)
2280                                 {
2281                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2282                                     ERR_R_EC_LIB);
2283                                 goto err;
2284                                 }
2285                         if (EC_POINT_oct2point(group,
2286                             clnt_ecpoint, p, i, bn_ctx) == 0)
2287                                 {
2288                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2289                                     ERR_R_EC_LIB);
2290                                 goto err;
2291                                 }
2292                         /* p is pointing to somewhere in the buffer
2293                          * currently, so set it to the start
2294                          */
2295                         p=(unsigned char *)s->init_buf->data;
2296                         }
2297
2298                 /* Compute the shared pre-master secret */
2299                 field_size = EC_GROUP_get_degree(group);
2300                 if (field_size <= 0)
2301                         {
2302                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2303                                ERR_R_ECDH_LIB);
2304                         goto err;
2305                         }
2306                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2307                 if (i <= 0)
2308                         {
2309                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2310                             ERR_R_ECDH_LIB);
2311                         goto err;
2312                         }
2313
2314                 EVP_PKEY_free(clnt_pub_pkey);
2315                 EC_POINT_free(clnt_ecpoint);
2316                 if (srvr_ecdh != NULL)
2317                         EC_KEY_free(srvr_ecdh);
2318                 BN_CTX_free(bn_ctx);
2319
2320                 /* Compute the master secret */
2321                 s->session->master_key_length = s->method->ssl3_enc-> \
2322                     generate_master_secret(s, s->session->master_key, p, i);
2323
2324                 OPENSSL_cleanse(p, i);
2325                 return (ret);
2326                 }
2327         else
2328 #endif
2329                 {
2330                 al=SSL_AD_HANDSHAKE_FAILURE;
2331                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2332                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2333                 goto f_err;
2334                 }
2335
2336         return(1);
2337 f_err:
2338         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2339 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2340 err:
2341 #endif
2342 #ifndef OPENSSL_NO_ECDH
2343         EVP_PKEY_free(clnt_pub_pkey);
2344         EC_POINT_free(clnt_ecpoint);
2345         if (srvr_ecdh != NULL)
2346                 EC_KEY_free(srvr_ecdh);
2347         BN_CTX_free(bn_ctx);
2348 #endif
2349         return(-1);
2350         }
2351
2352 int ssl3_get_cert_verify(SSL *s)
2353         {
2354         EVP_PKEY *pkey=NULL;
2355         unsigned char *p;
2356         int al,ok,ret=0;
2357         long n;
2358         int type=0,i,j;
2359         X509 *peer;
2360
2361         n=s->method->ssl_get_message(s,
2362                 SSL3_ST_SR_CERT_VRFY_A,
2363                 SSL3_ST_SR_CERT_VRFY_B,
2364                 -1,
2365                 514, /* 514? */
2366                 &ok);
2367
2368         if (!ok) return((int)n);
2369
2370         if (s->session->peer != NULL)
2371                 {
2372                 peer=s->session->peer;
2373                 pkey=X509_get_pubkey(peer);
2374                 type=X509_certificate_type(peer,pkey);
2375                 }
2376         else
2377                 {
2378                 peer=NULL;
2379                 pkey=NULL;
2380                 }
2381
2382         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2383                 {
2384                 s->s3->tmp.reuse_message=1;
2385                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2386                         {
2387                         al=SSL_AD_UNEXPECTED_MESSAGE;
2388                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2389                         goto f_err;
2390                         }
2391                 ret=1;
2392                 goto end;
2393                 }
2394
2395         if (peer == NULL)
2396                 {
2397                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2398                 al=SSL_AD_UNEXPECTED_MESSAGE;
2399                 goto f_err;
2400                 }
2401
2402         if (!(type & EVP_PKT_SIGN))
2403                 {
2404                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2405                 al=SSL_AD_ILLEGAL_PARAMETER;
2406                 goto f_err;
2407                 }
2408
2409         if (s->s3->change_cipher_spec)
2410                 {
2411                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2412                 al=SSL_AD_UNEXPECTED_MESSAGE;
2413                 goto f_err;
2414                 }
2415
2416         /* we now have a signature that we need to verify */
2417         p=(unsigned char *)s->init_msg;
2418         n2s(p,i);
2419         n-=2;
2420         if (i > n)
2421                 {
2422                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2423                 al=SSL_AD_DECODE_ERROR;
2424                 goto f_err;
2425                 }
2426
2427         j=EVP_PKEY_size(pkey);
2428         if ((i > j) || (n > j) || (n <= 0))
2429                 {
2430                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2431                 al=SSL_AD_DECODE_ERROR;
2432                 goto f_err;
2433                 }
2434
2435 #ifndef OPENSSL_NO_RSA
2436         if (pkey->type == EVP_PKEY_RSA)
2437                 {
2438                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2439                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
2440                                                         pkey->pkey.rsa);
2441                 if (i < 0)
2442                         {
2443                         al=SSL_AD_DECRYPT_ERROR;
2444                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2445                         goto f_err;
2446                         }
2447                 if (i == 0)
2448                         {
2449                         al=SSL_AD_DECRYPT_ERROR;
2450                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2451                         goto f_err;
2452                         }
2453                 }
2454         else
2455 #endif
2456 #ifndef OPENSSL_NO_DSA
2457                 if (pkey->type == EVP_PKEY_DSA)
2458                 {
2459                 j=DSA_verify(pkey->save_type,
2460                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2461                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2462                 if (j <= 0)
2463                         {
2464                         /* bad signature */
2465                         al=SSL_AD_DECRYPT_ERROR;
2466                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2467                         goto f_err;
2468                         }
2469                 }
2470         else
2471 #endif
2472 #ifndef OPENSSL_NO_ECDSA
2473                 if (pkey->type == EVP_PKEY_EC)
2474                 {
2475                 j=ECDSA_verify(pkey->save_type,
2476                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2477                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2478                 if (j <= 0)
2479                         {
2480                         /* bad signature */
2481                         al=SSL_AD_DECRYPT_ERROR;
2482                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2483                             SSL_R_BAD_ECDSA_SIGNATURE);
2484                         goto f_err;
2485                         }
2486                 }
2487         else
2488 #endif
2489                 {
2490                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2491                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2492                 goto f_err;
2493                 }
2494
2495
2496         ret=1;
2497         if (0)
2498                 {
2499 f_err:
2500                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2501                 }
2502 end:
2503         EVP_PKEY_free(pkey);
2504         return(ret);
2505         }
2506
2507 int ssl3_get_client_certificate(SSL *s)
2508         {
2509         int i,ok,al,ret= -1;
2510         X509 *x=NULL;
2511         unsigned long l,nc,llen,n;
2512         const unsigned char *p,*q;
2513         unsigned char *d;
2514         STACK_OF(X509) *sk=NULL;
2515
2516         n=s->method->ssl_get_message(s,
2517                 SSL3_ST_SR_CERT_A,
2518                 SSL3_ST_SR_CERT_B,
2519                 -1,
2520                 s->max_cert_list,
2521                 &ok);
2522
2523         if (!ok) return((int)n);
2524
2525         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2526                 {
2527                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2528                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2529                         {
2530                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2531                         al=SSL_AD_HANDSHAKE_FAILURE;
2532                         goto f_err;
2533                         }
2534                 /* If tls asked for a client cert, the client must return a 0 list */
2535                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2536                         {
2537                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2538                         al=SSL_AD_UNEXPECTED_MESSAGE;
2539                         goto f_err;
2540                         }
2541                 s->s3->tmp.reuse_message=1;
2542                 return(1);
2543                 }
2544
2545         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2546                 {
2547                 al=SSL_AD_UNEXPECTED_MESSAGE;
2548                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2549                 goto f_err;
2550                 }
2551         p=d=(unsigned char *)s->init_msg;
2552
2553         if ((sk=sk_X509_new_null()) == NULL)
2554                 {
2555                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2556                 goto err;
2557                 }
2558
2559         n2l3(p,llen);
2560         if (llen+3 != n)
2561                 {
2562                 al=SSL_AD_DECODE_ERROR;
2563                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2564                 goto f_err;
2565                 }
2566         for (nc=0; nc<llen; )
2567                 {
2568                 n2l3(p,l);
2569                 if ((l+nc+3) > llen)
2570                         {
2571                         al=SSL_AD_DECODE_ERROR;
2572                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2573                         goto f_err;
2574                         }
2575
2576                 q=p;
2577                 x=d2i_X509(NULL,&p,l);
2578                 if (x == NULL)
2579                         {
2580                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2581                         goto err;
2582                         }
2583                 if (p != (q+l))
2584                         {
2585                         al=SSL_AD_DECODE_ERROR;
2586                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2587                         goto f_err;
2588                         }
2589                 if (!sk_X509_push(sk,x))
2590                         {
2591                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2592                         goto err;
2593                         }
2594                 x=NULL;
2595                 nc+=l+3;
2596                 }
2597
2598         if (sk_X509_num(sk) <= 0)
2599                 {
2600                 /* TLS does not mind 0 certs returned */
2601                 if (s->version == SSL3_VERSION)
2602                         {
2603                         al=SSL_AD_HANDSHAKE_FAILURE;
2604                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2605                         goto f_err;
2606                         }
2607                 /* Fail for TLS only if we required a certificate */
2608                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2609                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2610                         {
2611                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2612                         al=SSL_AD_HANDSHAKE_FAILURE;
2613                         goto f_err;
2614                         }
2615                 }
2616         else
2617                 {
2618                 i=ssl_verify_cert_chain(s,sk);
2619                 if (i <= 0)
2620                         {
2621                         al=ssl_verify_alarm_type(s->verify_result);
2622                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2623                         goto f_err;
2624                         }
2625                 }
2626
2627         if (s->session->peer != NULL) /* This should not be needed */
2628                 X509_free(s->session->peer);
2629         s->session->peer=sk_X509_shift(sk);
2630         s->session->verify_result = s->verify_result;
2631
2632         /* With the current implementation, sess_cert will always be NULL
2633          * when we arrive here. */
2634         if (s->session->sess_cert == NULL)
2635                 {
2636                 s->session->sess_cert = ssl_sess_cert_new();
2637                 if (s->session->sess_cert == NULL)
2638                         {
2639                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2640                         goto err;
2641                         }
2642                 }
2643         if (s->session->sess_cert->cert_chain != NULL)
2644                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2645         s->session->sess_cert->cert_chain=sk;
2646         /* Inconsistency alert: cert_chain does *not* include the
2647          * peer's own certificate, while we do include it in s3_clnt.c */
2648
2649         sk=NULL;
2650
2651         ret=1;
2652         if (0)
2653                 {
2654 f_err:
2655                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2656                 }
2657 err:
2658         if (x != NULL) X509_free(x);
2659         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2660         return(ret);
2661         }
2662
2663 int ssl3_send_server_certificate(SSL *s)
2664         {
2665         unsigned long l;
2666         X509 *x;
2667
2668         if (s->state == SSL3_ST_SW_CERT_A)
2669                 {
2670                 x=ssl_get_server_send_cert(s);
2671                 if (x == NULL &&
2672                         /* VRS: allow null cert if auth == KRB5 */
2673                         (s->s3->tmp.new_cipher->algorithms
2674                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
2675                         != (SSL_aKRB5|SSL_kKRB5))
2676                         {
2677                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2678                         return(0);
2679                         }
2680
2681                 l=ssl3_output_cert_chain(s,x);
2682                 s->state=SSL3_ST_SW_CERT_B;
2683                 s->init_num=(int)l;
2684                 s->init_off=0;
2685                 }
2686
2687         /* SSL3_ST_SW_CERT_B */
2688         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2689         }
2690
2691
2692 #ifndef OPENSSL_NO_ECDH
2693 /* This is the complement of curve_id2nid in s3_clnt.c. */
2694 static int nid2curve_id(int nid)
2695 {
2696         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2697          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2698         switch (nid) {
2699         case NID_sect163k1: /* sect163k1 (1) */
2700                 return 1;
2701         case NID_sect163r1: /* sect163r1 (2) */
2702                 return 2;
2703         case NID_sect163r2: /* sect163r2 (3) */
2704                 return 3;
2705         case NID_sect193r1: /* sect193r1 (4) */
2706                 return 4;
2707         case NID_sect193r2: /* sect193r2 (5) */
2708                 return 5;
2709         case NID_sect233k1: /* sect233k1 (6) */
2710                 return 6;
2711         case NID_sect233r1: /* sect233r1 (7) */
2712                 return 7;
2713         case NID_sect239k1: /* sect239k1 (8) */
2714                 return 8;
2715         case NID_sect283k1: /* sect283k1 (9) */
2716                 return 9;
2717         case NID_sect283r1: /* sect283r1 (10) */
2718                 return 10;
2719         case NID_sect409k1: /* sect409k1 (11) */
2720                 return 11;
2721         case NID_sect409r1: /* sect409r1 (12) */
2722                 return 12;
2723         case NID_sect571k1: /* sect571k1 (13) */
2724                 return 13;
2725         case NID_sect571r1: /* sect571r1 (14) */
2726                 return 14;
2727         case NID_secp160k1: /* secp160k1 (15) */
2728                 return 15;
2729         case NID_secp160r1: /* secp160r1 (16) */
2730                 return 16;
2731         case NID_secp160r2: /* secp160r2 (17) */
2732                 return 17;
2733         case NID_secp192k1: /* secp192k1 (18) */
2734                 return 18;
2735         case NID_X9_62_prime192v1: /* secp192r1 (19) */
2736                 return 19;
2737         case NID_secp224k1: /* secp224k1 (20) */
2738                 return 20;
2739         case NID_secp224r1: /* secp224r1 (21) */
2740                 return 21;
2741         case NID_secp256k1: /* secp256k1 (22) */
2742                 return 22;
2743         case NID_X9_62_prime256v1: /* secp256r1 (23) */
2744                 return 23;
2745         case NID_secp384r1: /* secp384r1 (24) */
2746                 return 24;
2747         case NID_secp521r1:  /* secp521r1 (25) */
2748                 return 25;
2749         default:
2750                 return 0;
2751         }
2752 }
2753 #endif
2754 #ifndef OPENSSL_NO_TLSEXT
2755 int ssl3_send_newsession_ticket(SSL *s)
2756         {
2757         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
2758                 {
2759                 unsigned char *p, *senc, *macstart;
2760                 int len, slen;
2761                 unsigned int hlen;
2762                 EVP_CIPHER_CTX ctx;
2763                 HMAC_CTX hctx;
2764                 SSL_CTX *tctx = s->initial_ctx;
2765                 unsigned char iv[EVP_MAX_IV_LENGTH];
2766                 unsigned char key_name[16];
2767
2768                 /* get session encoding length */
2769                 slen = i2d_SSL_SESSION(s->session, NULL);
2770                 /* Some length values are 16 bits, so forget it if session is
2771                  * too long
2772                  */
2773                 if (slen > 0xFF00)
2774                         return -1;
2775                 /* Grow buffer if need be: the length calculation is as
2776                  * follows 1 (size of message name) + 3 (message length
2777                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
2778                  * 16 (key name) + max_iv_len (iv length) +
2779                  * session_length + max_enc_block_size (max encrypted session
2780                  * length) + max_md_size (HMAC).
2781                  */
2782                 if (!BUF_MEM_grow(s->init_buf,
2783                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
2784                         EVP_MAX_MD_SIZE + slen))
2785                         return -1;
2786                 senc = OPENSSL_malloc(slen);
2787                 if (!senc)
2788                         return -1;
2789                 p = senc;
2790                 i2d_SSL_SESSION(s->session, &p);
2791
2792                 p=(unsigned char *)s->init_buf->data;
2793                 /* do the header */
2794                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
2795                 /* Skip message length for now */
2796                 p += 3;
2797                 EVP_CIPHER_CTX_init(&ctx);
2798                 HMAC_CTX_init(&hctx);
2799                 /* Initialize HMAC and cipher contexts. If callback present
2800                  * it does all the work otherwise use generated values
2801                  * from parent ctx.
2802                  */
2803                 if (tctx->tlsext_ticket_key_cb)
2804                         {
2805                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
2806                                                          &hctx, 1) < 0)
2807                                 {
2808                                 OPENSSL_free(senc);
2809                                 return -1;
2810                                 }
2811                         }
2812                 else
2813                         {
2814                         RAND_pseudo_bytes(iv, 16);
2815                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
2816                                         tctx->tlsext_tick_aes_key, iv);
2817                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
2818                                         tlsext_tick_md(), NULL);
2819                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
2820                         }
2821                 l2n(s->session->tlsext_tick_lifetime_hint, p);
2822                 /* Skip ticket length for now */
2823                 p += 2;
2824                 /* Output key name */
2825                 macstart = p;
2826                 memcpy(p, key_name, 16);
2827                 p += 16;
2828                 /* output IV */
2829                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
2830                 p += EVP_CIPHER_CTX_iv_length(&ctx);
2831                 /* Encrypt session data */
2832                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
2833                 p += len;
2834                 EVP_EncryptFinal(&ctx, p, &len);
2835                 p += len;
2836                 EVP_CIPHER_CTX_cleanup(&ctx);
2837
2838                 HMAC_Update(&hctx, macstart, p - macstart);
2839                 HMAC_Final(&hctx, p, &hlen);
2840                 HMAC_CTX_cleanup(&hctx);
2841
2842                 p += hlen;
2843                 /* Now write out lengths: p points to end of data written */
2844                 /* Total length */
2845                 len = p - (unsigned char *)s->init_buf->data;
2846                 p=(unsigned char *)s->init_buf->data + 1;
2847                 l2n3(len - 4, p); /* Message length */
2848                 p += 4;
2849                 s2n(len - 10, p);  /* Ticket length */
2850
2851                 /* number of bytes to write */
2852                 s->init_num= len;
2853                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
2854                 s->init_off=0;
2855                 OPENSSL_free(senc);
2856                 }
2857
2858         /* SSL3_ST_SW_SESSION_TICKET_B */
2859         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2860         }
2861
2862 int ssl3_send_cert_status(SSL *s)
2863         {
2864         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
2865                 {
2866                 unsigned char *p;
2867                 /* Grow buffer if need be: the length calculation is as
2868                  * follows 1 (message type) + 3 (message length) +
2869                  * 1 (ocsp response type) + 3 (ocsp response length)
2870                  * + (ocsp response)
2871                  */
2872                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
2873                         return -1;
2874
2875                 p=(unsigned char *)s->init_buf->data;
2876
2877                 /* do the header */
2878                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
2879                 /* message length */
2880                 l2n3(s->tlsext_ocsp_resplen + 4, p);
2881                 /* status type */
2882                 *(p++)= s->tlsext_status_type;
2883                 /* length of OCSP response */
2884                 l2n3(s->tlsext_ocsp_resplen, p);
2885                 /* actual response */
2886                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
2887                 /* number of bytes to write */
2888                 s->init_num = 8 + s->tlsext_ocsp_resplen;
2889                 s->state=SSL3_ST_SW_CERT_STATUS_B;
2890                 s->init_off = 0;
2891                 }
2892
2893         /* SSL3_ST_SW_CERT_STATUS_B */
2894         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2895         }
2896 #endif