ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124 /* ====================================================================
 125  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 133  * support (see RFC 4279) to OpenSSL.
 134  *
 135  * No patent licenses or other rights except those expressly stated in
 136  * the OpenSSL open source license shall be deemed granted or received
 137  * expressly, by implication, estoppel, or otherwise.
 138  *
 139  * No assurances are provided by Nokia that the Contribution does not
 140  * infringe the patent or other intellectual property rights of any third
 141  * party or that the license provides you with all the necessary rights
 142  * to make use of the Contribution.
 143  *
 144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 148  * OTHERWISE.
 149  */
 150
 151 #define REUSE_CIPHER_BUG
 152 #define NETSCAPE_HANG_BUG
 153
 154 #include <stdio.h>
 155 #include <openssl/crypto.h>
 156 #include "ssl_locl.h"
 157 #include "kssl_lcl.h"
 158 #include <openssl/buffer.h>
 159 #include <openssl/rand.h>
 160 #include <openssl/objects.h>
 161 #include <openssl/evp.h>
 162 #include <openssl/hmac.h>
 163 #include <openssl/x509.h>
 164 #ifndef OPENSSL_NO_DH
 165 #include <openssl/dh.h>
 166 #endif
 167 #include <openssl/bn.h>
 168 #ifndef OPENSSL_NO_KRB5
 169 #include <openssl/krb5_asn.h>
 170 #endif
 171 #include <openssl/md5.h>
 172
 173 static const SSL_METHOD *ssl3_get_server_method(int ver);
 174
 175 static const SSL_METHOD *ssl3_get_server_method(int ver)
 176         {
 177         if (ver == SSL3_VERSION)
 178                 return(SSLv3_server_method());
 179         else
 180                 return(NULL);
 181         }
 182
 183 #ifndef OPENSSL_NO_SRP
 184 static int ssl_check_srp_ext_ClientHello(SSL *s,int *al)
 185         {
 186         int ret = SSL_ERROR_NONE;
 187
 188         *al = SSL_AD_UNRECOGNIZED_NAME;
 189
 190         if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
 191             (s->srp_ctx.TLS_ext_srp_username_callback != NULL))
 192                 {
 193                 if(s->srp_ctx.login == NULL)
 194                         {
 195                         /* RFC 5054 says SHOULD reject,
 196                            we do so if There is no srp login name */
 197                         ret = SSL3_AL_FATAL;
 198                         *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
 199                         }
 200                 else
 201                         {
 202                         ret = SSL_srp_server_param_with_username(s,al);
 203                         }
 204                 }
 205         return ret;
 206         }
 207 #endif
 208
 209 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
 210                         ssl3_accept,
 211                         ssl_undefined_function,
 212                         ssl3_get_server_method)
 213
 214 int ssl3_accept(SSL *s)
 215         {
 216         BUF_MEM *buf;
 217         unsigned long alg_k,Time=(unsigned long)time(NULL);
 218         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 219         int ret= -1;
 220         int new_state,state,skip=0;
 221
 222         RAND_add(&Time,sizeof(Time),0);
 223         ERR_clear_error();
 224         clear_sys_error();
 225
 226         if (s->info_callback != NULL)
 227                 cb=s->info_callback;
 228         else if (s->ctx->info_callback != NULL)
 229                 cb=s->ctx->info_callback;
 230
 231         /* init things to blank */
 232         s->in_handshake++;
 233         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 234
 235         if (s->cert == NULL)
 236                 {
 237                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 238                 return(-1);
 239                 }
 240
 241 #ifndef OPENSSL_NO_HEARTBEATS
 242         /* If we're awaiting a HeartbeatResponse, pretend we
 243          * already got and don't await it anymore, because
 244          * Heartbeats don't make sense during handshakes anyway.
 245          */
 246         if (s->tlsext_hb_pending)
 247                 {
 248                 s->tlsext_hb_pending = 0;
 249                 s->tlsext_hb_seq++;
 250                 }
 251 #endif
 252
 253         for (;;)
 254                 {
 255                 state=s->state;
 256
 257                 switch (s->state)
 258                         {
 259                 case SSL_ST_RENEGOTIATE:
 260                         s->renegotiate=1;
 261                         /* s->state=SSL_ST_ACCEPT; */
 262
 263                 case SSL_ST_BEFORE:
 264                 case SSL_ST_ACCEPT:
 265                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 266                 case SSL_ST_OK|SSL_ST_ACCEPT:
 267
 268                         s->server=1;
 269                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 270
 271                         if ((s->version>>8) != 3)
 272                                 {
 273                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 274                                 return -1;
 275                                 }
 276                         s->type=SSL_ST_ACCEPT;
 277
 278                         if (s->init_buf == NULL)
 279                                 {
 280                                 if ((buf=BUF_MEM_new()) == NULL)
 281                                         {
 282                                         ret= -1;
 283                                         goto end;
 284                                         }
 285                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 286                                         {
 287                                         ret= -1;
 288                                         goto end;
 289                                         }
 290                                 s->init_buf=buf;
 291                                 }
 292
 293                         if (!ssl3_setup_buffers(s))
 294                                 {
 295                                 ret= -1;
 296                                 goto end;
 297                                 }
 298
 299                         s->init_num=0;
 300                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
 301                         s->s3->flags &= ~TLS1_FLAGS_SKIP_CERT_VERIFY;
 302
 303                         if (s->state != SSL_ST_RENEGOTIATE)
 304                                 {
 305                                 /* Ok, we now need to push on a buffering BIO so that
 306                                  * the output is sent in a way that TCP likes :-)
 307                                  */
 308                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 309
 310                                 ssl3_init_finished_mac(s);
 311                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 312                                 s->ctx->stats.sess_accept++;
 313                                 }
 314                         else if (!s->s3->send_connection_binding &&
 315                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
 316                                 {
 317                                 /* Server attempting to renegotiate with
 318                                  * client that doesn't support secure
 319                                  * renegotiation.
 320                                  */
 321                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
 322                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 323                                 ret = -1;
 324                                 goto end;
 325                                 }
 326                         else
 327                                 {
 328                                 /* s->state == SSL_ST_RENEGOTIATE,
 329                                  * we will just send a HelloRequest */
 330                                 s->ctx->stats.sess_accept_renegotiate++;
 331                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 332                                 }
 333                         break;
 334
 335                 case SSL3_ST_SW_HELLO_REQ_A:
 336                 case SSL3_ST_SW_HELLO_REQ_B:
 337
 338                         s->shutdown=0;
 339                         ret=ssl3_send_hello_request(s);
 340                         if (ret <= 0) goto end;
 341                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 342                         s->state=SSL3_ST_SW_FLUSH;
 343                         s->init_num=0;
 344
 345                         ssl3_init_finished_mac(s);
 346                         break;
 347
 348                 case SSL3_ST_SW_HELLO_REQ_C:
 349                         s->state=SSL_ST_OK;
 350                         break;
 351
 352                 case SSL3_ST_SR_CLNT_HELLO_A:
 353                 case SSL3_ST_SR_CLNT_HELLO_B:
 354                 case SSL3_ST_SR_CLNT_HELLO_C:
 355
 356                         if (s->rwstate != SSL_X509_LOOKUP)
 357                         {
 358                                 ret=ssl3_get_client_hello(s);
 359                                 if (ret <= 0) goto end;
 360                         }
 361 #ifndef OPENSSL_NO_SRP
 362                         {
 363                         int al;
 364                         if ((ret = ssl_check_srp_ext_ClientHello(s,&al))  < 0)
 365                                         {
 366                                         /* callback indicates firther work to be done */
 367                                         s->rwstate=SSL_X509_LOOKUP;
 368                                         goto end;
 369                                         }
 370                         if (ret != SSL_ERROR_NONE)
 371                                 {
 372                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 373                                 /* This is not really an error but the only means to
 374                                    for a client to detect whether srp is supported. */
 375                                    if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)
 376                                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);
 377                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
 378                                 ret= -1;
 379                                 goto end;
 380                                 }
 381                         }
 382 #endif
 383
 384                         s->renegotiate = 2;
 385                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 386                         s->init_num=0;
 387                         break;
 388
 389                 case SSL3_ST_SW_SRVR_HELLO_A:
 390                 case SSL3_ST_SW_SRVR_HELLO_B:
 391                         ret=ssl3_send_server_hello(s);
 392                         if (ret <= 0) goto end;
 393 #ifndef OPENSSL_NO_TLSEXT
 394                         if (s->hit)
 395                                 {
 396                                 if (s->tlsext_ticket_expected)
 397                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 398                                 else
 399                                         s->state=SSL3_ST_SW_CHANGE_A;
 400                                 }
 401 #else
 402                         if (s->hit)
 403                                         s->state=SSL3_ST_SW_CHANGE_A;
 404 #endif
 405                         else
 406                                 s->state=SSL3_ST_SW_CERT_A;
 407                         s->init_num=0;
 408                         break;
 409
 410                 case SSL3_ST_SW_CERT_A:
 411                 case SSL3_ST_SW_CERT_B:
 412                         /* Check if it is anon DH or anon ECDH, */
 413                         /* normal PSK or KRB5 or SRP */
 414                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
 415                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
 416                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
 417                                 {
 418                                 ret=ssl3_send_server_certificate(s);
 419                                 if (ret <= 0) goto end;
 420 #ifndef OPENSSL_NO_TLSEXT
 421                                 if (s->tlsext_status_expected)
 422                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 423                                 else
 424                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 425                                 }
 426                         else
 427                                 {
 428                                 skip = 1;
 429                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 430                                 }
 431 #else
 432                                 }
 433                         else
 434                                 skip=1;
 435
 436                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 437 #endif
 438                         s->init_num=0;
 439                         break;
 440
 441                 case SSL3_ST_SW_KEY_EXCH_A:
 442                 case SSL3_ST_SW_KEY_EXCH_B:
 443                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 444
 445                         /* clear this, it may get reset by
 446                          * send_server_key_exchange */
 447                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 448 #ifndef OPENSSL_NO_KRB5
 449                                 && !(alg_k & SSL_kKRB5)
 450 #endif /* OPENSSL_NO_KRB5 */
 451                                 )
 452                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 453                                  * even when forbidden by protocol specs
 454                                  * (handshake may fail as clients are not required to
 455                                  * be able to handle this) */
 456                                 s->s3->tmp.use_rsa_tmp=1;
 457                         else
 458                                 s->s3->tmp.use_rsa_tmp=0;
 459
 460
 461                         /* only send if a DH key exchange, fortezza or
 462                          * RSA but we have a sign only certificate
 463                          *
 464                          * PSK: may send PSK identity hints
 465                          *
 466                          * For ECC ciphersuites, we send a serverKeyExchange
 467                          * message only if the cipher suite is either
 468                          * ECDH-anon or ECDHE. In other cases, the
 469                          * server certificate contains the server's
 470                          * public key for key exchange.
 471                          */
 472                         if (s->s3->tmp.use_rsa_tmp
 473                         /* PSK: send ServerKeyExchange if PSK identity
 474                          * hint if provided */
 475 #ifndef OPENSSL_NO_PSK
 476                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 477 #endif
 478 #ifndef OPENSSL_NO_SRP
 479                             /* SRP: send ServerKeyExchange */
 480                             || (alg_k & SSL_kSRP)
 481 #endif
 482                             || (alg_k & SSL_kEDH)
 483                             || (alg_k & SSL_kEECDH)
 484                             || ((alg_k & SSL_kRSA)
 485                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 486                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 487                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 488                                         )
 489                                     )
 490                                 )
 491                             )
 492                                 {
 493                                 ret=ssl3_send_server_key_exchange(s);
 494                                 if (ret <= 0) goto end;
 495                                 }
 496                         else
 497                                 skip=1;
 498
 499                         s->state=SSL3_ST_SW_CERT_REQ_A;
 500                         s->init_num=0;
 501                         break;
 502
 503                 case SSL3_ST_SW_CERT_REQ_A:
 504                 case SSL3_ST_SW_CERT_REQ_B:
 505                         if (/* don't request cert unless asked for it: */
 506                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 507                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 508                                  * don't request cert during re-negotiation: */
 509                                 ((s->session->peer != NULL) &&
 510                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 511                                 /* never request cert in anonymous ciphersuites
 512                                  * (see section "Certificate request" in SSL 3 drafts
 513                                  * and in RFC 2246): */
 514                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 515                                  /* ... except when the application insists on verification
 516                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 517                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 518                                  /* never request cert in Kerberos ciphersuites */
 519                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
 520                                 /* With normal PSK Certificates and
 521                                  * Certificate Requests are omitted */
 522                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 523                                 {
 524                                 /* no cert request */
 525                                 skip=1;
 526                                 s->s3->tmp.cert_request=0;
 527                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 528                                 if (s->s3->handshake_buffer)
 529                                         if (!ssl3_digest_cached_records(s))
 530                                                 return -1;
 531                                 }
 532                         else
 533                                 {
 534                                 s->s3->tmp.cert_request=1;
 535                                 ret=ssl3_send_certificate_request(s);
 536                                 if (ret <= 0) goto end;
 537 #ifndef NETSCAPE_HANG_BUG
 538                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 539 #else
 540                                 s->state=SSL3_ST_SW_FLUSH;
 541                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 542 #endif
 543                                 s->init_num=0;
 544                                 }
 545                         break;
 546
 547                 case SSL3_ST_SW_SRVR_DONE_A:
 548                 case SSL3_ST_SW_SRVR_DONE_B:
 549                         ret=ssl3_send_server_done(s);
 550                         if (ret <= 0) goto end;
 551                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 552                         s->state=SSL3_ST_SW_FLUSH;
 553                         s->init_num=0;
 554                         break;
 555
 556                 case SSL3_ST_SW_FLUSH:
 557
 558                         /* This code originally checked to see if
 559                          * any data was pending using BIO_CTRL_INFO
 560                          * and then flushed. This caused problems
 561                          * as documented in PR#1939. The proposed
 562                          * fix doesn't completely resolve this issue
 563                          * as buggy implementations of BIO_CTRL_PENDING
 564                          * still exist. So instead we just flush
 565                          * unconditionally.
 566                          */
 567
 568                         s->rwstate=SSL_WRITING;
 569                         if (BIO_flush(s->wbio) <= 0)
 570                                 {
 571                                 ret= -1;
 572                                 goto end;
 573                                 }
 574                         s->rwstate=SSL_NOTHING;
 575
 576                         s->state=s->s3->tmp.next_state;
 577                         break;
 578
 579                 case SSL3_ST_SR_CERT_A:
 580                 case SSL3_ST_SR_CERT_B:
 581                         /* Check for second client hello (MS SGC) */
 582                         ret = ssl3_check_client_hello(s);
 583                         if (ret <= 0)
 584                                 goto end;
 585                         if (ret == 2)
 586                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 587                         else {
 588                                 if (s->s3->tmp.cert_request)
 589                                         {
 590                                         ret=ssl3_get_client_certificate(s);
 591                                         if (ret <= 0) goto end;
 592                                         }
 593                                 s->init_num=0;
 594                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 595                         }
 596                         break;
 597
 598                 case SSL3_ST_SR_KEY_EXCH_A:
 599                 case SSL3_ST_SR_KEY_EXCH_B:
 600                         ret=ssl3_get_client_key_exchange(s);
 601                         if (ret <= 0)
 602                                 goto end;
 603                         if (ret == 2)
 604                                 {
 605                                 /* For the ECDH ciphersuites when
 606                                  * the client sends its ECDH pub key in
 607                                  * a certificate, the CertificateVerify
 608                                  * message is not sent.
 609                                  * Also for GOST ciphersuites when
 610                                  * the client uses its key from the certificate
 611                                  * for key exchange.
 612                                  */
 613 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 614                                 s->state=SSL3_ST_SR_FINISHED_A;
 615 #else
 616                                 if (s->s3->next_proto_neg_seen)
 617                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
 618                                 else
 619                                         s->state=SSL3_ST_SR_FINISHED_A;
 620 #endif
 621                                 s->init_num = 0;
 622                                 }
 623                         else if (TLS1_get_version(s) >= TLS1_2_VERSION)
 624                                 {
 625                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 626                                 s->init_num=0;
 627                                 if (!s->session->peer)
 628                                         break;
 629                                 /* For TLS v1.2 freeze the handshake buffer
 630                                  * at this point and digest cached records.
 631                                  */
 632                                 if (!s->s3->handshake_buffer)
 633                                         {
 634                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
 635                                         return -1;
 636                                         }
 637                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
 638                                 if (!ssl3_digest_cached_records(s))
 639                                         return -1;
 640                                 }
 641                         else
 642                                 {
 643                                 int offset=0;
 644                                 int dgst_num;
 645
 646                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 647                                 s->init_num=0;
 648
 649                                 /* We need to get hashes here so if there is
 650                                  * a client cert, it can be verified
 651                                  * FIXME - digest processing for CertificateVerify
 652                                  * should be generalized. But it is next step
 653                                  */
 654                                 if (s->s3->handshake_buffer)
 655                                         if (!ssl3_digest_cached_records(s))
 656                                                 return -1;
 657                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
 658                                         if (s->s3->handshake_dgst[dgst_num])
 659                                                 {
 660                                                 int dgst_size;
 661
 662                                                 s->method->ssl3_enc->cert_verify_mac(s,EVP_MD_CTX_type(s->s3->handshake_dgst[dgst_num]),&(s->s3->tmp.cert_verify_md[offset]));
 663                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
 664                                                 if (dgst_size < 0)
 665                                                         {
 666                                                         ret = -1;
 667                                                         goto end;
 668                                                         }
 669                                                 offset+=dgst_size;
 670                                                 }
 671                                 }
 672                         break;
 673
 674                 case SSL3_ST_SR_CERT_VRFY_A:
 675                 case SSL3_ST_SR_CERT_VRFY_B:
 676
 677                         /* we should decide if we expected this one */
 678                         ret=ssl3_get_cert_verify(s);
 679                         if (ret <= 0) goto end;
 680
 681 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 682                         s->state=SSL3_ST_SR_FINISHED_A;
 683 #else
 684                         if (s->s3->next_proto_neg_seen)
 685                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
 686                         else
 687                                 s->state=SSL3_ST_SR_FINISHED_A;
 688 #endif
 689                         s->init_num=0;
 690                         break;
 691
 692 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 693                 case SSL3_ST_SR_NEXT_PROTO_A:
 694                 case SSL3_ST_SR_NEXT_PROTO_B:
 695                         ret=ssl3_get_next_proto(s);
 696                         if (ret <= 0) goto end;
 697                         s->init_num = 0;
 698                         s->state=SSL3_ST_SR_FINISHED_A;
 699                         break;
 700 #endif
 701
 702                 case SSL3_ST_SR_FINISHED_A:
 703                 case SSL3_ST_SR_FINISHED_B:
 704                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 705                                 SSL3_ST_SR_FINISHED_B);
 706                         if (ret <= 0) goto end;
 707                         if (s->hit)
 708                                 s->state=SSL_ST_OK;
 709 #ifndef OPENSSL_NO_TLSEXT
 710                         else if (s->tlsext_ticket_expected)
 711                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 712 #endif
 713                         else
 714                                 s->state=SSL3_ST_SW_CHANGE_A;
 715                         s->init_num=0;
 716                         break;
 717
 718 #ifndef OPENSSL_NO_TLSEXT
 719                 case SSL3_ST_SW_SESSION_TICKET_A:
 720                 case SSL3_ST_SW_SESSION_TICKET_B:
 721                         ret=ssl3_send_newsession_ticket(s);
 722                         if (ret <= 0) goto end;
 723                         s->state=SSL3_ST_SW_CHANGE_A;
 724                         s->init_num=0;
 725                         break;
 726
 727                 case SSL3_ST_SW_CERT_STATUS_A:
 728                 case SSL3_ST_SW_CERT_STATUS_B:
 729                         ret=ssl3_send_cert_status(s);
 730                         if (ret <= 0) goto end;
 731                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 732                         s->init_num=0;
 733                         break;
 734
 735 #endif
 736
 737                 case SSL3_ST_SW_CHANGE_A:
 738                 case SSL3_ST_SW_CHANGE_B:
 739
 740                         s->session->cipher=s->s3->tmp.new_cipher;
 741                         if (!s->method->ssl3_enc->setup_key_block(s))
 742                                 { ret= -1; goto end; }
 743
 744                         ret=ssl3_send_change_cipher_spec(s,
 745                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 746
 747                         if (ret <= 0) goto end;
 748                         s->state=SSL3_ST_SW_FINISHED_A;
 749                         s->init_num=0;
 750
 751                         if (!s->method->ssl3_enc->change_cipher_state(s,
 752                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 753                                 {
 754                                 ret= -1;
 755                                 goto end;
 756                                 }
 757
 758                         break;
 759
 760                 case SSL3_ST_SW_FINISHED_A:
 761                 case SSL3_ST_SW_FINISHED_B:
 762                         ret=ssl3_send_finished(s,
 763                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 764                                 s->method->ssl3_enc->server_finished_label,
 765                                 s->method->ssl3_enc->server_finished_label_len);
 766                         if (ret <= 0) goto end;
 767                         s->state=SSL3_ST_SW_FLUSH;
 768                         if (s->hit)
 769                                 {
 770 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 771                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 772 #else
 773                                 if (s->s3->next_proto_neg_seen)
 774                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
 775                                 else
 776                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 777 #endif
 778                                 }
 779                         else
 780                                 s->s3->tmp.next_state=SSL_ST_OK;
 781                         s->init_num=0;
 782                         break;
 783
 784                 case SSL_ST_OK:
 785                         /* clean a few things up */
 786                         ssl3_cleanup_key_block(s);
 787
 788                         BUF_MEM_free(s->init_buf);
 789                         s->init_buf=NULL;
 790
 791                         /* remove buffering on output */
 792                         ssl_free_wbio_buffer(s);
 793
 794                         s->init_num=0;
 795
 796                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
 797                                 {
 798                                 s->renegotiate=0;
 799                                 s->new_session=0;
 800
 801                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 802
 803                                 s->ctx->stats.sess_accept_good++;
 804                                 /* s->server=1; */
 805                                 s->handshake_func=ssl3_accept;
 806
 807                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 808                                 }
 809
 810                         ret = 1;
 811                         goto end;
 812                         /* break; */
 813
 814                 default:
 815                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 816                         ret= -1;
 817                         goto end;
 818                         /* break; */
 819                         }
 820
 821                 if (!s->s3->tmp.reuse_message && !skip)
 822                         {
 823                         if (s->debug)
 824                                 {
 825                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 826                                         goto end;
 827                                 }
 828
 829
 830                         if ((cb != NULL) && (s->state != state))
 831                                 {
 832                                 new_state=s->state;
 833                                 s->state=state;
 834                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 835                                 s->state=new_state;
 836                                 }
 837                         }
 838                 skip=0;
 839                 }
 840 end:
 841         /* BIO_flush(s->wbio); */
 842
 843         s->in_handshake--;
 844         if (cb != NULL)
 845                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 846         return(ret);
 847         }
 848
 849 int ssl3_send_hello_request(SSL *s)
 850         {
 851         unsigned char *p;
 852
 853         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 854                 {
 855                 p=(unsigned char *)s->init_buf->data;
 856                 *(p++)=SSL3_MT_HELLO_REQUEST;
 857                 *(p++)=0;
 858                 *(p++)=0;
 859                 *(p++)=0;
 860
 861                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 862                 /* number of bytes to write */
 863                 s->init_num=4;
 864                 s->init_off=0;
 865                 }
 866
 867         /* SSL3_ST_SW_HELLO_REQ_B */
 868         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 869         }
 870
 871 int ssl3_check_client_hello(SSL *s)
 872         {
 873         int ok;
 874         long n;
 875
 876         /* this function is called when we really expect a Certificate message,
 877          * so permit appropriate message length */
 878         n=s->method->ssl_get_message(s,
 879                 SSL3_ST_SR_CERT_A,
 880                 SSL3_ST_SR_CERT_B,
 881                 -1,
 882                 s->max_cert_list,
 883                 &ok);
 884         if (!ok) return((int)n);
 885         s->s3->tmp.reuse_message = 1;
 886         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 887                 {
 888                 /* We only allow the client to restart the handshake once per
 889                  * negotiation. */
 890                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
 891                         {
 892                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
 893                         return -1;
 894                         }
 895                 /* Throw away what we have done so far in the current handshake,
 896                  * which will now be aborted. (A full SSL_clear would be too much.) */
 897 #ifndef OPENSSL_NO_DH
 898                 if (s->s3->tmp.dh != NULL)
 899                         {
 900                         DH_free(s->s3->tmp.dh);
 901                         s->s3->tmp.dh = NULL;
 902                         }
 903 #endif
 904 #ifndef OPENSSL_NO_ECDH
 905                 if (s->s3->tmp.ecdh != NULL)
 906                         {
 907                         EC_KEY_free(s->s3->tmp.ecdh);
 908                         s->s3->tmp.ecdh = NULL;
 909                         }
 910 #endif
 911                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
 912                 return 2;
 913                 }
 914         return 1;
 915 }
 916
 917 int ssl3_get_client_hello(SSL *s)
 918         {
 919         int i,j,ok,al,ret= -1;
 920         unsigned int cookie_len;
 921         long n;
 922         unsigned long id;
 923         unsigned char *p,*d,*q;
 924         SSL_CIPHER *c;
 925 #ifndef OPENSSL_NO_COMP
 926         SSL_COMP *comp=NULL;
 927 #endif
 928         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 929
 930         /* We do this so that we will respond with our native type.
 931          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 932          * This down switching should be handled by a different method.
 933          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 934          * TLSv1.
 935          */
 936         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
 937                 )
 938                 {
 939                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 940                 }
 941         s->first_packet=1;
 942         n=s->method->ssl_get_message(s,
 943                 SSL3_ST_SR_CLNT_HELLO_B,
 944                 SSL3_ST_SR_CLNT_HELLO_C,
 945                 SSL3_MT_CLIENT_HELLO,
 946                 SSL3_RT_MAX_PLAIN_LENGTH,
 947                 &ok);
 948
 949         if (!ok) return((int)n);
 950         s->first_packet=0;
 951         d=p=(unsigned char *)s->init_msg;
 952
 953         /* use version from inside client hello, not from record header
 954          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 955         s->client_version=(((int)p[0])<<8)|(int)p[1];
 956         p+=2;
 957
 958         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 959             (s->version != DTLS1_VERSION && s->client_version < s->version))
 960                 {
 961                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 962                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 963                         {
 964                         /* similar to ssl3_get_record, send alert using remote version number */
 965                         s->version = s->client_version;
 966                         }
 967                 al = SSL_AD_PROTOCOL_VERSION;
 968                 goto f_err;
 969                 }
 970
 971         /* If we require cookies and this ClientHello doesn't
 972          * contain one, just return since we do not want to
 973          * allocate any memory yet. So check cookie length...
 974          */
 975         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
 976                 {
 977                 unsigned int session_length, cookie_length;
 978
 979                 session_length = *(p + SSL3_RANDOM_SIZE);
 980                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
 981
 982                 if (cookie_length == 0)
 983                         return 1;
 984                 }
 985
 986         /* load the client random */
 987         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 988         p+=SSL3_RANDOM_SIZE;
 989
 990         /* get the session-id */
 991         j= *(p++);
 992
 993         s->hit=0;
 994         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
 995          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
 996          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
 997          * than a change to default behavior so that applications relying on this for security
 998          * won't even compile against older library versions).
 999          *
1000          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1001          * renegotiation but not a new session (s->new_session remains unset): for servers,
1002          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1003          * setting will be ignored.
1004          */
1005         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1006                 {
1007                 if (!ssl_get_new_session(s,1))
1008                         goto err;
1009                 }
1010         else
1011                 {
1012                 i=ssl_get_prev_session(s, p, j, d + n);
1013                 if (i == 1)
1014                         { /* previous session */
1015                         s->hit=1;
1016                         }
1017                 else if (i == -1)
1018                         goto err;
1019                 else /* i == 0 */
1020                         {
1021                         if (!ssl_get_new_session(s,1))
1022                                 goto err;
1023                         }
1024                 }
1025
1026         p+=j;
1027
1028         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1029                 {
1030                 /* cookie stuff */
1031                 cookie_len = *(p++);
1032
1033                 /*
1034                  * The ClientHello may contain a cookie even if the
1035                  * HelloVerify message has not been sent--make sure that it
1036                  * does not cause an overflow.
1037                  */
1038                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1039                         {
1040                         /* too much data */
1041                         al = SSL_AD_DECODE_ERROR;
1042                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1043                         goto f_err;
1044                         }
1045
1046                 /* verify the cookie if appropriate option is set. */
1047                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1048                         cookie_len > 0)
1049                         {
1050                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1051
1052                         if ( s->ctx->app_verify_cookie_cb != NULL)
1053                                 {
1054                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1055                                         cookie_len) == 0)
1056                                         {
1057                                         al=SSL_AD_HANDSHAKE_FAILURE;
1058                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1059                                                 SSL_R_COOKIE_MISMATCH);
1060                                         goto f_err;
1061                                         }
1062                                 /* else cookie verification succeeded */
1063                                 }
1064                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
1065                                                   s->d1->cookie_len) != 0) /* default verification */
1066                                 {
1067                                         al=SSL_AD_HANDSHAKE_FAILURE;
1068                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1069                                                 SSL_R_COOKIE_MISMATCH);
1070                                         goto f_err;
1071                                 }
1072
1073                         ret = 2;
1074                         }
1075
1076                 p += cookie_len;
1077                 }
1078
1079         n2s(p,i);
1080         if ((i == 0) && (j != 0))
1081                 {
1082                 /* we need a cipher if we are not resuming a session */
1083                 al=SSL_AD_ILLEGAL_PARAMETER;
1084                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1085                 goto f_err;
1086                 }
1087         if ((p+i) >= (d+n))
1088                 {
1089                 /* not enough data */
1090                 al=SSL_AD_DECODE_ERROR;
1091                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1092                 goto f_err;
1093                 }
1094         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1095                 == NULL))
1096                 {
1097                 goto err;
1098                 }
1099         p+=i;
1100
1101         /* If it is a hit, check that the cipher is in the list */
1102         if ((s->hit) && (i > 0))
1103                 {
1104                 j=0;
1105                 id=s->session->cipher->id;
1106
1107 #ifdef CIPHER_DEBUG
1108                 printf("client sent %d ciphers\n",sk_num(ciphers));
1109 #endif
1110                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1111                         {
1112                         c=sk_SSL_CIPHER_value(ciphers,i);
1113 #ifdef CIPHER_DEBUG
1114                         printf("client [%2d of %2d]:%s\n",
1115                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1116 #endif
1117                         if (c->id == id)
1118                                 {
1119                                 j=1;
1120                                 break;
1121                                 }
1122                         }
1123 /* Disabled because it can be used in a ciphersuite downgrade
1124  * attack: CVE-2010-4180.
1125  */
1126 #if 0
1127                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1128                         {
1129                         /* Special case as client bug workaround: the previously used cipher may
1130                          * not be in the current list, the client instead might be trying to
1131                          * continue using a cipher that before wasn't chosen due to server
1132                          * preferences.  We'll have to reject the connection if the cipher is not
1133                          * enabled, though. */
1134                         c = sk_SSL_CIPHER_value(ciphers, 0);
1135                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1136                                 {
1137                                 s->session->cipher = c;
1138                                 j = 1;
1139                                 }
1140                         }
1141 #endif
1142                 if (j == 0)
1143                         {
1144                         /* we need to have the cipher in the cipher
1145                          * list if we are asked to reuse it */
1146                         al=SSL_AD_ILLEGAL_PARAMETER;
1147                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1148                         goto f_err;
1149                         }
1150                 }
1151
1152         /* compression */
1153         i= *(p++);
1154         if ((p+i) > (d+n))
1155                 {
1156                 /* not enough data */
1157                 al=SSL_AD_DECODE_ERROR;
1158                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1159                 goto f_err;
1160                 }
1161         q=p;
1162         for (j=0; j<i; j++)
1163                 {
1164                 if (p[j] == 0) break;
1165                 }
1166
1167         p+=i;
1168         if (j >= i)
1169                 {
1170                 /* no compress */
1171                 al=SSL_AD_DECODE_ERROR;
1172                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1173                 goto f_err;
1174                 }
1175
1176 #ifndef OPENSSL_NO_TLSEXT
1177         /* TLS extensions*/
1178         if (s->version >= SSL3_VERSION)
1179                 {
1180                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1181                         {
1182                         /* 'al' set by ssl_parse_clienthello_tlsext */
1183                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1184                         goto f_err;
1185                         }
1186                 }
1187                 if (ssl_check_clienthello_tlsext(s) <= 0) {
1188                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1189                         goto err;
1190                 }
1191
1192         /* Check if we want to use external pre-shared secret for this
1193          * handshake for not reused session only. We need to generate
1194          * server_random before calling tls_session_secret_cb in order to allow
1195          * SessionTicket processing to use it in key derivation. */
1196         {
1197                 unsigned long Time;
1198                 unsigned char *pos;
1199                 Time=(unsigned long)time(NULL);                 /* Time */
1200                 pos=s->s3->server_random;
1201                 l2n(Time,pos);
1202                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1203                         {
1204                         al=SSL_AD_INTERNAL_ERROR;
1205                         goto f_err;
1206                         }
1207         }
1208
1209         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1210                 {
1211                 SSL_CIPHER *pref_cipher=NULL;
1212
1213                 s->session->master_key_length=sizeof(s->session->master_key);
1214                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1215                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1216                         {
1217                         s->hit=1;
1218                         s->session->ciphers=ciphers;
1219                         s->session->verify_result=X509_V_OK;
1220
1221                         ciphers=NULL;
1222
1223                         /* check if some cipher was preferred by call back */
1224                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1225                         if (pref_cipher == NULL)
1226                                 {
1227                                 al=SSL_AD_HANDSHAKE_FAILURE;
1228                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1229                                 goto f_err;
1230                                 }
1231
1232                         s->session->cipher=pref_cipher;
1233
1234                         if (s->cipher_list)
1235                                 sk_SSL_CIPHER_free(s->cipher_list);
1236
1237                         if (s->cipher_list_by_id)
1238                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1239
1240                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1241                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1242                         }
1243                 }
1244 #endif
1245
1246         /* Worst case, we will use the NULL compression, but if we have other
1247          * options, we will now look for them.  We have i-1 compression
1248          * algorithms from the client, starting at q. */
1249         s->s3->tmp.new_compression=NULL;
1250 #ifndef OPENSSL_NO_COMP
1251         /* This only happens if we have a cache hit */
1252         if (s->session->compress_meth != 0)
1253                 {
1254                 int m, comp_id = s->session->compress_meth;
1255                 /* Perform sanity checks on resumed compression algorithm */
1256                 /* Can't disable compression */
1257                 if (s->options & SSL_OP_NO_COMPRESSION)
1258                         {
1259                         al=SSL_AD_INTERNAL_ERROR;
1260                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1261                         goto f_err;
1262                         }
1263                 /* Look for resumed compression method */
1264                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1265                         {
1266                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1267                         if (comp_id == comp->id)
1268                                 {
1269                                 s->s3->tmp.new_compression=comp;
1270                                 break;
1271                                 }
1272                         }
1273                 if (s->s3->tmp.new_compression == NULL)
1274                         {
1275                         al=SSL_AD_INTERNAL_ERROR;
1276                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1277                         goto f_err;
1278                         }
1279                 /* Look for resumed method in compression list */
1280                 for (m = 0; m < i; m++)
1281                         {
1282                         if (q[m] == comp_id)
1283                                 break;
1284                         }
1285                 if (m >= i)
1286                         {
1287                         al=SSL_AD_ILLEGAL_PARAMETER;
1288                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1289                         goto f_err;
1290                         }
1291                 }
1292         else if (s->hit)
1293                 comp = NULL;
1294         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1295                 { /* See if we have a match */
1296                 int m,nn,o,v,done=0;
1297
1298                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1299                 for (m=0; m<nn; m++)
1300                         {
1301                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1302                         v=comp->id;
1303                         for (o=0; o<i; o++)
1304                                 {
1305                                 if (v == q[o])
1306                                         {
1307                                         done=1;
1308                                         break;
1309                                         }
1310                                 }
1311                         if (done) break;
1312                         }
1313                 if (done)
1314                         s->s3->tmp.new_compression=comp;
1315                 else
1316                         comp=NULL;
1317                 }
1318 #else
1319         /* If compression is disabled we'd better not try to resume a session
1320          * using compression.
1321          */
1322         if (s->session->compress_meth != 0)
1323                 {
1324                 al=SSL_AD_INTERNAL_ERROR;
1325                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1326                 goto f_err;
1327                 }
1328 #endif
1329
1330         /* Given s->session->ciphers and SSL_get_ciphers, we must
1331          * pick a cipher */
1332
1333         if (!s->hit)
1334                 {
1335 #ifdef OPENSSL_NO_COMP
1336                 s->session->compress_meth=0;
1337 #else
1338                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1339 #endif
1340                 if (s->session->ciphers != NULL)
1341                         sk_SSL_CIPHER_free(s->session->ciphers);
1342                 s->session->ciphers=ciphers;
1343                 if (ciphers == NULL)
1344                         {
1345                         al=SSL_AD_ILLEGAL_PARAMETER;
1346                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1347                         goto f_err;
1348                         }
1349                 ciphers=NULL;
1350                 c=ssl3_choose_cipher(s,s->session->ciphers,
1351                                      SSL_get_ciphers(s));
1352
1353                 if (c == NULL)
1354                         {
1355                         al=SSL_AD_HANDSHAKE_FAILURE;
1356                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1357                         goto f_err;
1358                         }
1359                 s->s3->tmp.new_cipher=c;
1360                 /* check whether we should disable session resumption */
1361                 if (s->not_resumable_session_cb != NULL)
1362                         s->session->not_resumable=s->not_resumable_session_cb(s,
1363                                 ((c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)) != 0));
1364                 if (s->session->not_resumable)
1365                         /* do not send a session ticket */
1366                         s->tlsext_ticket_expected = 0;
1367                 }
1368         else
1369                 {
1370                 /* Session-id reuse */
1371 #ifdef REUSE_CIPHER_BUG
1372                 STACK_OF(SSL_CIPHER) *sk;
1373                 SSL_CIPHER *nc=NULL;
1374                 SSL_CIPHER *ec=NULL;
1375
1376                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1377                         {
1378                         sk=s->session->ciphers;
1379                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1380                                 {
1381                                 c=sk_SSL_CIPHER_value(sk,i);
1382                                 if (c->algorithm_enc & SSL_eNULL)
1383                                         nc=c;
1384                                 if (SSL_C_IS_EXPORT(c))
1385                                         ec=c;
1386                                 }
1387                         if (nc != NULL)
1388                                 s->s3->tmp.new_cipher=nc;
1389                         else if (ec != NULL)
1390                                 s->s3->tmp.new_cipher=ec;
1391                         else
1392                                 s->s3->tmp.new_cipher=s->session->cipher;
1393                         }
1394                 else
1395 #endif
1396                 s->s3->tmp.new_cipher=s->session->cipher;
1397                 }
1398
1399         if (TLS1_get_version(s) < TLS1_2_VERSION || !(s->verify_mode & SSL_VERIFY_PEER))
1400                 {
1401                 if (!ssl3_digest_cached_records(s))
1402                         goto f_err;
1403                 }
1404
1405         /* we now have the following setup.
1406          * client_random
1407          * cipher_list          - our prefered list of ciphers
1408          * ciphers              - the clients prefered list of ciphers
1409          * compression          - basically ignored right now
1410          * ssl version is set   - sslv3
1411          * s->session           - The ssl session has been setup.
1412          * s->hit               - session reuse flag
1413          * s->tmp.new_cipher    - the new cipher to use.
1414          */
1415
1416         if (ret < 0) ret=1;
1417         if (0)
1418                 {
1419 f_err:
1420                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1421                 }
1422 err:
1423         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1424         return(ret);
1425         }
1426
1427 int ssl3_send_server_hello(SSL *s)
1428         {
1429         unsigned char *buf;
1430         unsigned char *p,*d;
1431         int i,sl;
1432         unsigned long l;
1433 #ifdef OPENSSL_NO_TLSEXT
1434         unsigned long Time;
1435 #endif
1436
1437         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1438                 {
1439                 buf=(unsigned char *)s->init_buf->data;
1440 #ifdef OPENSSL_NO_TLSEXT
1441                 p=s->s3->server_random;
1442                 /* Generate server_random if it was not needed previously */
1443                 Time=(unsigned long)time(NULL);                 /* Time */
1444                 l2n(Time,p);
1445                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1446                         return -1;
1447 #endif
1448                 /* Do the message type and length last */
1449                 d=p= &(buf[4]);
1450
1451                 *(p++)=s->version>>8;
1452                 *(p++)=s->version&0xff;
1453
1454                 /* Random stuff */
1455                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1456                 p+=SSL3_RANDOM_SIZE;
1457
1458                 /* There are several cases for the session ID to send
1459                  * back in the server hello:
1460                  * - For session reuse from the session cache,
1461                  *   we send back the old session ID.
1462                  * - If stateless session reuse (using a session ticket)
1463                  *   is successful, we send back the client's "session ID"
1464                  *   (which doesn't actually identify the session).
1465                  * - If it is a new session, we send back the new
1466                  *   session ID.
1467                  * - However, if we want the new session to be single-use,
1468                  *   we send back a 0-length session ID.
1469                  * s->hit is non-zero in either case of session reuse,
1470                  * so the following won't overwrite an ID that we're supposed
1471                  * to send back.
1472                  */
1473                 if (s->session->not_resumable ||
1474                         (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1475                                 && !s->hit))
1476                         s->session->session_id_length=0;
1477
1478                 sl=s->session->session_id_length;
1479                 if (sl > (int)sizeof(s->session->session_id))
1480                         {
1481                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1482                         return -1;
1483                         }
1484                 *(p++)=sl;
1485                 memcpy(p,s->session->session_id,sl);
1486                 p+=sl;
1487
1488                 /* put the cipher */
1489                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1490                 p+=i;
1491
1492                 /* put the compression method */
1493 #ifdef OPENSSL_NO_COMP
1494                         *(p++)=0;
1495 #else
1496                 if (s->s3->tmp.new_compression == NULL)
1497                         *(p++)=0;
1498                 else
1499                         *(p++)=s->s3->tmp.new_compression->id;
1500 #endif
1501 #ifndef OPENSSL_NO_TLSEXT
1502                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1503                         {
1504                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1505                         return -1;
1506                         }
1507                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1508                         {
1509                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1510                         return -1;
1511                         }
1512 #endif
1513                 /* do the header */
1514                 l=(p-d);
1515                 d=buf;
1516                 *(d++)=SSL3_MT_SERVER_HELLO;
1517                 l2n3(l,d);
1518
1519                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1520                 /* number of bytes to write */
1521                 s->init_num=p-buf;
1522                 s->init_off=0;
1523                 }
1524
1525         /* SSL3_ST_SW_SRVR_HELLO_B */
1526         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1527         }
1528
1529 int ssl3_send_server_done(SSL *s)
1530         {
1531         unsigned char *p;
1532
1533         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1534                 {
1535                 p=(unsigned char *)s->init_buf->data;
1536
1537                 /* do the header */
1538                 *(p++)=SSL3_MT_SERVER_DONE;
1539                 *(p++)=0;
1540                 *(p++)=0;
1541                 *(p++)=0;
1542
1543                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1544                 /* number of bytes to write */
1545                 s->init_num=4;
1546                 s->init_off=0;
1547                 }
1548
1549         /* SSL3_ST_SW_SRVR_DONE_B */
1550         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1551         }
1552
1553 int ssl3_send_server_key_exchange(SSL *s)
1554         {
1555 #ifndef OPENSSL_NO_RSA
1556         unsigned char *q;
1557         int j,num;
1558         RSA *rsa;
1559         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1560         unsigned int u;
1561 #endif
1562 #ifndef OPENSSL_NO_DH
1563         DH *dh=NULL,*dhp;
1564 #endif
1565 #ifndef OPENSSL_NO_ECDH
1566         EC_KEY *ecdh=NULL, *ecdhp;
1567         unsigned char *encodedPoint = NULL;
1568         int encodedlen = 0;
1569         int curve_id = 0;
1570         BN_CTX *bn_ctx = NULL;
1571 #endif
1572         EVP_PKEY *pkey;
1573         const EVP_MD *md = NULL;
1574         unsigned char *p,*d;
1575         int al,i;
1576         unsigned long type;
1577         int n;
1578         CERT *cert;
1579         BIGNUM *r[4];
1580         int nr[4],kn;
1581         BUF_MEM *buf;
1582         EVP_MD_CTX md_ctx;
1583
1584         EVP_MD_CTX_init(&md_ctx);
1585         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1586                 {
1587                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1588                 cert=s->cert;
1589
1590                 buf=s->init_buf;
1591
1592                 r[0]=r[1]=r[2]=r[3]=NULL;
1593                 n=0;
1594 #ifndef OPENSSL_NO_RSA
1595                 if (type & SSL_kRSA)
1596                         {
1597                         rsa=cert->rsa_tmp;
1598                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1599                                 {
1600                                 rsa=s->cert->rsa_tmp_cb(s,
1601                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1602                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1603                                 if(rsa == NULL)
1604                                 {
1605                                         al=SSL_AD_HANDSHAKE_FAILURE;
1606                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1607                                         goto f_err;
1608                                 }
1609                                 RSA_up_ref(rsa);
1610                                 cert->rsa_tmp=rsa;
1611                                 }
1612                         if (rsa == NULL)
1613                                 {
1614                                 al=SSL_AD_HANDSHAKE_FAILURE;
1615                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1616                                 goto f_err;
1617                                 }
1618                         r[0]=rsa->n;
1619                         r[1]=rsa->e;
1620                         s->s3->tmp.use_rsa_tmp=1;
1621                         }
1622                 else
1623 #endif
1624 #ifndef OPENSSL_NO_DH
1625                         if (type & SSL_kEDH)
1626                         {
1627                         dhp=cert->dh_tmp;
1628                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1629                                 dhp=s->cert->dh_tmp_cb(s,
1630                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1631                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1632                         if (dhp == NULL)
1633                                 {
1634                                 al=SSL_AD_HANDSHAKE_FAILURE;
1635                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1636                                 goto f_err;
1637                                 }
1638
1639                         if (s->s3->tmp.dh != NULL)
1640                                 {
1641                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1642                                 goto err;
1643                                 }
1644
1645                         if ((dh=DHparams_dup(dhp)) == NULL)
1646                                 {
1647                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1648                                 goto err;
1649                                 }
1650
1651                         s->s3->tmp.dh=dh;
1652                         if ((dhp->pub_key == NULL ||
1653                              dhp->priv_key == NULL ||
1654                              (s->options & SSL_OP_SINGLE_DH_USE)))
1655                                 {
1656                                 if(!DH_generate_key(dh))
1657                                     {
1658                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1659                                            ERR_R_DH_LIB);
1660                                     goto err;
1661                                     }
1662                                 }
1663                         else
1664                                 {
1665                                 dh->pub_key=BN_dup(dhp->pub_key);
1666                                 dh->priv_key=BN_dup(dhp->priv_key);
1667                                 if ((dh->pub_key == NULL) ||
1668                                         (dh->priv_key == NULL))
1669                                         {
1670                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1671                                         goto err;
1672                                         }
1673                                 }
1674                         r[0]=dh->p;
1675                         r[1]=dh->g;
1676                         r[2]=dh->pub_key;
1677                         }
1678                 else
1679 #endif
1680 #ifndef OPENSSL_NO_ECDH
1681                         if (type & SSL_kEECDH)
1682                         {
1683                         const EC_GROUP *group;
1684
1685                         ecdhp=cert->ecdh_tmp;
1686                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1687                                 {
1688                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1689                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1690                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1691                                 }
1692                         if (ecdhp == NULL)
1693                                 {
1694                                 al=SSL_AD_HANDSHAKE_FAILURE;
1695                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1696                                 goto f_err;
1697                                 }
1698
1699                         if (s->s3->tmp.ecdh != NULL)
1700                                 {
1701                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1702                                 goto err;
1703                                 }
1704
1705                         /* Duplicate the ECDH structure. */
1706                         if (ecdhp == NULL)
1707                                 {
1708                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1709                                 goto err;
1710                                 }
1711                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1712                                 {
1713                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1714                                 goto err;
1715                                 }
1716
1717                         s->s3->tmp.ecdh=ecdh;
1718                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1719                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1720                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1721                                 {
1722                                 if(!EC_KEY_generate_key(ecdh))
1723                                     {
1724                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1725                                     goto err;
1726                                     }
1727                                 }
1728
1729                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1730                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1731                             (EC_KEY_get0_private_key(ecdh) == NULL))
1732                                 {
1733                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1734                                 goto err;
1735                                 }
1736
1737                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1738                             (EC_GROUP_get_degree(group) > 163))
1739                                 {
1740                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1741                                 goto err;
1742                                 }
1743
1744                         /* XXX: For now, we only support ephemeral ECDH
1745                          * keys over named (not generic) curves. For
1746                          * supported named curves, curve_id is non-zero.
1747                          */
1748                         if ((curve_id =
1749                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1750                             == 0)
1751                                 {
1752                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1753                                 goto err;
1754                                 }
1755
1756                         /* Encode the public key.
1757                          * First check the size of encoding and
1758                          * allocate memory accordingly.
1759                          */
1760                         encodedlen = EC_POINT_point2oct(group,
1761                             EC_KEY_get0_public_key(ecdh),
1762                             POINT_CONVERSION_UNCOMPRESSED,
1763                             NULL, 0, NULL);
1764
1765                         encodedPoint = (unsigned char *)
1766                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1767                         bn_ctx = BN_CTX_new();
1768                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1769                                 {
1770                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1771                                 goto err;
1772                                 }
1773
1774
1775                         encodedlen = EC_POINT_point2oct(group,
1776                             EC_KEY_get0_public_key(ecdh),
1777                             POINT_CONVERSION_UNCOMPRESSED,
1778                             encodedPoint, encodedlen, bn_ctx);
1779
1780                         if (encodedlen == 0)
1781                                 {
1782                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1783                                 goto err;
1784                                 }
1785
1786                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1787
1788                         /* XXX: For now, we only support named (not
1789                          * generic) curves in ECDH ephemeral key exchanges.
1790                          * In this situation, we need four additional bytes
1791                          * to encode the entire ServerECDHParams
1792                          * structure.
1793                          */
1794                         n = 4 + encodedlen;
1795
1796                         /* We'll generate the serverKeyExchange message
1797                          * explicitly so we can set these to NULLs
1798                          */
1799                         r[0]=NULL;
1800                         r[1]=NULL;
1801                         r[2]=NULL;
1802                         r[3]=NULL;
1803                         }
1804                 else
1805 #endif /* !OPENSSL_NO_ECDH */
1806 #ifndef OPENSSL_NO_PSK
1807                         if (type & SSL_kPSK)
1808                                 {
1809                                 /* reserve size for record length and PSK identity hint*/
1810                                 n+=2+strlen(s->ctx->psk_identity_hint);
1811                                 }
1812                         else
1813 #endif /* !OPENSSL_NO_PSK */
1814 #ifndef OPENSSL_NO_SRP
1815                 if (type & SSL_kSRP)
1816                         {
1817                         if ((s->srp_ctx.N == NULL) ||
1818                                 (s->srp_ctx.g == NULL) ||
1819                                 (s->srp_ctx.s == NULL) ||
1820                                 (s->srp_ctx.B == NULL))
1821                                 {
1822                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1823                                 goto err;
1824                                 }
1825                         r[0]=s->srp_ctx.N;
1826                         r[1]=s->srp_ctx.g;
1827                         r[2]=s->srp_ctx.s;
1828                         r[3]=s->srp_ctx.B;
1829                         }
1830                 else
1831 #endif
1832                         {
1833                         al=SSL_AD_HANDSHAKE_FAILURE;
1834                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1835                         goto f_err;
1836                         }
1837                 for (i=0; r[i] != NULL && i<4; i++)
1838                         {
1839                         nr[i]=BN_num_bytes(r[i]);
1840 #ifndef OPENSSL_NO_SRP
1841                         if ((i == 2) && (type & SSL_kSRP))
1842                                 n+=1+nr[i];
1843                         else
1844 #endif
1845                         n+=2+nr[i];
1846                         }
1847
1848                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1849                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1850                         {
1851                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1852                                 == NULL)
1853                                 {
1854                                 al=SSL_AD_DECODE_ERROR;
1855                                 goto f_err;
1856                                 }
1857                         kn=EVP_PKEY_size(pkey);
1858                         }
1859                 else
1860                         {
1861                         pkey=NULL;
1862                         kn=0;
1863                         }
1864
1865                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1866                         {
1867                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1868                         goto err;
1869                         }
1870                 d=(unsigned char *)s->init_buf->data;
1871                 p= &(d[4]);
1872
1873                 for (i=0; r[i] != NULL && i<4; i++)
1874                         {
1875 #ifndef OPENSSL_NO_SRP
1876                         if ((i == 2) && (type & SSL_kSRP))
1877                                 {
1878                                 *p = nr[i];
1879                                 p++;
1880                                 }
1881                         else
1882 #endif
1883                         s2n(nr[i],p);
1884                         BN_bn2bin(r[i],p);
1885                         p+=nr[i];
1886                         }
1887
1888 #ifndef OPENSSL_NO_ECDH
1889                 if (type & SSL_kEECDH)
1890                         {
1891                         /* XXX: For now, we only support named (not generic) curves.
1892                          * In this situation, the serverKeyExchange message has:
1893                          * [1 byte CurveType], [2 byte CurveName]
1894                          * [1 byte length of encoded point], followed by
1895                          * the actual encoded point itself
1896                          */
1897                         *p = NAMED_CURVE_TYPE;
1898                         p += 1;
1899                         *p = 0;
1900                         p += 1;
1901                         *p = curve_id;
1902                         p += 1;
1903                         *p = encodedlen;
1904                         p += 1;
1905                         memcpy((unsigned char*)p,
1906                             (unsigned char *)encodedPoint,
1907                             encodedlen);
1908                         OPENSSL_free(encodedPoint);
1909                         encodedPoint = NULL;
1910                         p += encodedlen;
1911                         }
1912 #endif
1913
1914 #ifndef OPENSSL_NO_PSK
1915                 if (type & SSL_kPSK)
1916                         {
1917                         /* copy PSK identity hint */
1918                         s2n(strlen(s->ctx->psk_identity_hint), p);
1919                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1920                         p+=strlen(s->ctx->psk_identity_hint);
1921                         }
1922 #endif
1923
1924                 /* not anonymous */
1925                 if (pkey != NULL)
1926                         {
1927                         /* n is the length of the params, they start at &(d[4])
1928                          * and p points to the space at the end. */
1929 #ifndef OPENSSL_NO_RSA
1930                         if (pkey->type == EVP_PKEY_RSA
1931                                         && TLS1_get_version(s) < TLS1_2_VERSION)
1932                                 {
1933                                 q=md_buf;
1934                                 j=0;
1935                                 for (num=2; num > 0; num--)
1936                                         {
1937                                         EVP_MD_CTX_set_flags(&md_ctx,
1938                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1939                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1940                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1941                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1942                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1943                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1944                                         EVP_DigestFinal_ex(&md_ctx,q,
1945                                                 (unsigned int *)&i);
1946                                         q+=i;
1947                                         j+=i;
1948                                         }
1949                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1950                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1951                                         {
1952                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1953                                         goto err;
1954                                         }
1955                                 s2n(u,p);
1956                                 n+=u+2;
1957                                 }
1958                         else
1959 #endif
1960                         if (md)
1961                                 {
1962                                 /* For TLS1.2 and later send signature
1963                                  * algorithm */
1964                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1965                                         {
1966                                         if (!tls12_get_sigandhash(p, pkey, md))
1967                                                 {
1968                                                 /* Should never happen */
1969                                                 al=SSL_AD_INTERNAL_ERROR;
1970                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1971                                                 goto f_err;
1972                                                 }
1973                                         p+=2;
1974                                         }
1975 #ifdef SSL_DEBUG
1976                                 fprintf(stderr, "Using hash %s\n",
1977                                                         EVP_MD_name(md));
1978 #endif
1979                                 EVP_SignInit_ex(&md_ctx, md, NULL);
1980                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1981                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1982                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1983                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1984                                         (unsigned int *)&i,pkey))
1985                                         {
1986                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
1987                                         goto err;
1988                                         }
1989                                 s2n(i,p);
1990                                 n+=i+2;
1991                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1992                                         n+= 2;
1993                                 }
1994                         else
1995                                 {
1996                                 /* Is this error check actually needed? */
1997                                 al=SSL_AD_HANDSHAKE_FAILURE;
1998                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1999                                 goto f_err;
2000                                 }
2001                         }
2002
2003                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
2004                 l2n3(n,d);
2005
2006                 /* we should now have things packed up, so lets send
2007                  * it off */
2008                 s->init_num=n+4;
2009                 s->init_off=0;
2010                 }
2011
2012         s->state = SSL3_ST_SW_KEY_EXCH_B;
2013         EVP_MD_CTX_cleanup(&md_ctx);
2014         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2015 f_err:
2016         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2017 err:
2018 #ifndef OPENSSL_NO_ECDH
2019         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2020         BN_CTX_free(bn_ctx);
2021 #endif
2022         EVP_MD_CTX_cleanup(&md_ctx);
2023         return(-1);
2024         }
2025
2026 int ssl3_send_certificate_request(SSL *s)
2027         {
2028         unsigned char *p,*d;
2029         int i,j,nl,off,n;
2030         STACK_OF(X509_NAME) *sk=NULL;
2031         X509_NAME *name;
2032         BUF_MEM *buf;
2033
2034         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2035                 {
2036                 buf=s->init_buf;
2037
2038                 d=p=(unsigned char *)&(buf->data[4]);
2039
2040                 /* get the list of acceptable cert types */
2041                 p++;
2042                 n=ssl3_get_req_cert_type(s,p);
2043                 d[0]=n;
2044                 p+=n;
2045                 n++;
2046
2047                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2048                         {
2049                         nl = tls12_get_req_sig_algs(s, p + 2);
2050                         s2n(nl, p);
2051                         p += nl + 2;
2052                         n += nl + 2;
2053                         }
2054
2055                 off=n;
2056                 p+=2;
2057                 n+=2;
2058
2059                 sk=SSL_get_client_CA_list(s);
2060                 nl=0;
2061                 if (sk != NULL)
2062                         {
2063                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2064                                 {
2065                                 name=sk_X509_NAME_value(sk,i);
2066                                 j=i2d_X509_NAME(name,NULL);
2067                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2068                                         {
2069                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2070                                         goto err;
2071                                         }
2072                                 p=(unsigned char *)&(buf->data[4+n]);
2073                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2074                                         {
2075                                         s2n(j,p);
2076                                         i2d_X509_NAME(name,&p);
2077                                         n+=2+j;
2078                                         nl+=2+j;
2079                                         }
2080                                 else
2081                                         {
2082                                         d=p;
2083                                         i2d_X509_NAME(name,&p);
2084                                         j-=2; s2n(j,d); j+=2;
2085                                         n+=j;
2086                                         nl+=j;
2087                                         }
2088                                 }
2089                         }
2090                 /* else no CA names */
2091                 p=(unsigned char *)&(buf->data[4+off]);
2092                 s2n(nl,p);
2093
2094                 d=(unsigned char *)buf->data;
2095                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
2096                 l2n3(n,d);
2097
2098                 /* we should now have things packed up, so lets send
2099                  * it off */
2100
2101                 s->init_num=n+4;
2102                 s->init_off=0;
2103 #ifdef NETSCAPE_HANG_BUG
2104                 p=(unsigned char *)s->init_buf->data + s->init_num;
2105
2106                 /* do the header */
2107                 *(p++)=SSL3_MT_SERVER_DONE;
2108                 *(p++)=0;
2109                 *(p++)=0;
2110                 *(p++)=0;
2111                 s->init_num += 4;
2112 #endif
2113
2114                 s->state = SSL3_ST_SW_CERT_REQ_B;
2115                 }
2116
2117         /* SSL3_ST_SW_CERT_REQ_B */
2118         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2119 err:
2120         return(-1);
2121         }
2122
2123 int ssl3_get_client_key_exchange(SSL *s)
2124         {
2125         int i,al,ok;
2126         long n;
2127         unsigned long alg_k;
2128         unsigned char *p;
2129 #ifndef OPENSSL_NO_RSA
2130         RSA *rsa=NULL;
2131         EVP_PKEY *pkey=NULL;
2132 #endif
2133 #ifndef OPENSSL_NO_DH
2134         BIGNUM *pub=NULL;
2135         DH *dh_srvr, *dh_clnt = NULL;
2136 #endif
2137 #ifndef OPENSSL_NO_KRB5
2138         KSSL_ERR kssl_err;
2139 #endif /* OPENSSL_NO_KRB5 */
2140
2141 #ifndef OPENSSL_NO_ECDH
2142         EC_KEY *srvr_ecdh = NULL;
2143         EVP_PKEY *clnt_pub_pkey = NULL;
2144         EC_POINT *clnt_ecpoint = NULL;
2145         BN_CTX *bn_ctx = NULL;
2146 #endif
2147
2148         n=s->method->ssl_get_message(s,
2149                 SSL3_ST_SR_KEY_EXCH_A,
2150                 SSL3_ST_SR_KEY_EXCH_B,
2151                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2152                 2048, /* ??? */
2153                 &ok);
2154
2155         if (!ok) return((int)n);
2156         p=(unsigned char *)s->init_msg;
2157
2158         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2159
2160 #ifndef OPENSSL_NO_RSA
2161         if (alg_k & SSL_kRSA)
2162                 {
2163                 /* FIX THIS UP EAY EAY EAY EAY */
2164                 if (s->s3->tmp.use_rsa_tmp)
2165                         {
2166                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2167                                 rsa=s->cert->rsa_tmp;
2168                         /* Don't do a callback because rsa_tmp should
2169                          * be sent already */
2170                         if (rsa == NULL)
2171                                 {
2172                                 al=SSL_AD_HANDSHAKE_FAILURE;
2173                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2174                                 goto f_err;
2175
2176                                 }
2177                         }
2178                 else
2179                         {
2180                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2181                         if (    (pkey == NULL) ||
2182                                 (pkey->type != EVP_PKEY_RSA) ||
2183                                 (pkey->pkey.rsa == NULL))
2184                                 {
2185                                 al=SSL_AD_HANDSHAKE_FAILURE;
2186                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2187                                 goto f_err;
2188                                 }
2189                         rsa=pkey->pkey.rsa;
2190                         }
2191
2192                 /* TLS and [incidentally] DTLS{0xFEFF} */
2193                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2194                         {
2195                         n2s(p,i);
2196                         if (n != i+2)
2197                                 {
2198                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2199                                         {
2200                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2201                                         goto err;
2202                                         }
2203                                 else
2204                                         p-=2;
2205                                 }
2206                         else
2207                                 n=i;
2208                         }
2209
2210                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2211
2212                 al = -1;
2213
2214                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2215                         {
2216                         al=SSL_AD_DECODE_ERROR;
2217                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2218                         }
2219
2220                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2221                         {
2222                         /* The premaster secret must contain the same version number as the
2223                          * ClientHello to detect version rollback attacks (strangely, the
2224                          * protocol does not offer such protection for DH ciphersuites).
2225                          * However, buggy clients exist that send the negotiated protocol
2226                          * version instead if the server does not support the requested
2227                          * protocol version.
2228                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2229                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2230                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2231                                 {
2232                                 al=SSL_AD_DECODE_ERROR;
2233                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2234
2235                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2236                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2237                                  * number check as a "bad version oracle" -- an alert would
2238                                  * reveal that the plaintext corresponding to some ciphertext
2239                                  * made up by the adversary is properly formatted except
2240                                  * that the version number is wrong.  To avoid such attacks,
2241                                  * we should treat this just like any other decryption error. */
2242                                 }
2243                         }
2244
2245                 if (al != -1)
2246                         {
2247                         /* Some decryption failure -- use random value instead as countermeasure
2248                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2249                          * (see RFC 2246, section 7.4.7.1). */
2250                         ERR_clear_error();
2251                         i = SSL_MAX_MASTER_KEY_LENGTH;
2252                         p[0] = s->client_version >> 8;
2253                         p[1] = s->client_version & 0xff;
2254                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2255                                 goto err;
2256                         }
2257
2258                 s->session->master_key_length=
2259                         s->method->ssl3_enc->generate_master_secret(s,
2260                                 s->session->master_key,
2261                                 p,i);
2262                 OPENSSL_cleanse(p,i);
2263                 }
2264         else
2265 #endif
2266 #ifndef OPENSSL_NO_DH
2267                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2268                 {
2269                 int idx = -1;
2270                 EVP_PKEY *skey = NULL;
2271                 if (n)
2272                         n2s(p,i);
2273                 if (n && n != i+2)
2274                         {
2275                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2276                                 {
2277                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2278                                 goto err;
2279                                 }
2280                         else
2281                                 {
2282                                 p-=2;
2283                                 i=(int)n;
2284                                 }
2285                         }
2286                 if (alg_k & SSL_kDHr)
2287                         idx = SSL_PKEY_DH_RSA;
2288                 else if (alg_k & SSL_kDHd)
2289                         idx = SSL_PKEY_DH_DSA;
2290                 if (idx >= 0)
2291                         {
2292                         skey = s->cert->pkeys[idx].privatekey;
2293                         if ((skey == NULL) ||
2294                                 (skey->type != EVP_PKEY_DH) ||
2295                                 (skey->pkey.dh == NULL))
2296                                 {
2297                                 al=SSL_AD_HANDSHAKE_FAILURE;
2298                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2299                                 goto f_err;
2300                                 }
2301                         dh_srvr = skey->pkey.dh;
2302                         }
2303                 else if (s->s3->tmp.dh == NULL)
2304                         {
2305                         al=SSL_AD_HANDSHAKE_FAILURE;
2306                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2307                         goto f_err;
2308                         }
2309                 else
2310                         dh_srvr=s->s3->tmp.dh;
2311
2312                 if (n == 0L)
2313                         {
2314                         /* Get pubkey from cert */
2315                         EVP_PKEY *clkey=X509_get_pubkey(s->session->peer);
2316                         if (clkey)
2317                                 {
2318                                 if (EVP_PKEY_cmp_parameters(clkey, skey) == 1)
2319                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2320                                 }
2321                         if (dh_clnt == NULL)
2322                                 {
2323                                 al=SSL_AD_HANDSHAKE_FAILURE;
2324                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2325                                 goto f_err;
2326                                 }
2327                         EVP_PKEY_free(clkey);
2328                         pub = dh_clnt->pub_key;
2329                         }
2330                 else
2331                         pub=BN_bin2bn(p,i,NULL);
2332                 if (pub == NULL)
2333                         {
2334                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2335                         goto err;
2336                         }
2337
2338                 i=DH_compute_key(p,pub,dh_srvr);
2339
2340                 if (i <= 0)
2341                         {
2342                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2343                         BN_clear_free(pub);
2344                         goto err;
2345                         }
2346
2347                 DH_free(s->s3->tmp.dh);
2348                 s->s3->tmp.dh=NULL;
2349                 if (dh_clnt)
2350                         DH_free(dh_clnt);
2351                 else
2352                         BN_clear_free(pub);
2353                 pub=NULL;
2354                 s->session->master_key_length=
2355                         s->method->ssl3_enc->generate_master_secret(s,
2356                                 s->session->master_key,p,i);
2357                 OPENSSL_cleanse(p,i);
2358                 if (dh_clnt)
2359                         return 2;
2360                 }
2361         else
2362 #endif
2363 #ifndef OPENSSL_NO_KRB5
2364         if (alg_k & SSL_kKRB5)
2365                 {
2366                 krb5_error_code         krb5rc;
2367                 krb5_data               enc_ticket;
2368                 krb5_data               authenticator;
2369                 krb5_data               enc_pms;
2370                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2371                 EVP_CIPHER_CTX          ciph_ctx;
2372                 const EVP_CIPHER        *enc = NULL;
2373                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2374                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2375                                                + EVP_MAX_BLOCK_LENGTH];
2376                 int                  padl, outl;
2377                 krb5_timestamp          authtime = 0;
2378                 krb5_ticket_times       ttimes;
2379
2380                 EVP_CIPHER_CTX_init(&ciph_ctx);
2381
2382                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2383
2384                 n2s(p,i);
2385                 enc_ticket.length = i;
2386
2387                 if (n < (long)(enc_ticket.length + 6))
2388                         {
2389                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2390                                 SSL_R_DATA_LENGTH_TOO_LONG);
2391                         goto err;
2392                         }
2393
2394                 enc_ticket.data = (char *)p;
2395                 p+=enc_ticket.length;
2396
2397                 n2s(p,i);
2398                 authenticator.length = i;
2399
2400                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2401                         {
2402                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2403                                 SSL_R_DATA_LENGTH_TOO_LONG);
2404                         goto err;
2405                         }
2406
2407                 authenticator.data = (char *)p;
2408                 p+=authenticator.length;
2409
2410                 n2s(p,i);
2411                 enc_pms.length = i;
2412                 enc_pms.data = (char *)p;
2413                 p+=enc_pms.length;
2414
2415                 /* Note that the length is checked again below,
2416                 ** after decryption
2417                 */
2418                 if(enc_pms.length > sizeof pms)
2419                         {
2420                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2421                                SSL_R_DATA_LENGTH_TOO_LONG);
2422                         goto err;
2423                         }
2424
2425                 if (n != (long)(enc_ticket.length + authenticator.length +
2426                                                 enc_pms.length + 6))
2427                         {
2428                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2429                                 SSL_R_DATA_LENGTH_TOO_LONG);
2430                         goto err;
2431                         }
2432
2433                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2434                                         &kssl_err)) != 0)
2435                         {
2436 #ifdef KSSL_DEBUG
2437                         printf("kssl_sget_tkt rtn %d [%d]\n",
2438                                 krb5rc, kssl_err.reason);
2439                         if (kssl_err.text)
2440                                 printf("kssl_err text= %s\n", kssl_err.text);
2441 #endif  /* KSSL_DEBUG */
2442                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2443                                 kssl_err.reason);
2444                         goto err;
2445                         }
2446
2447                 /*  Note: no authenticator is not considered an error,
2448                 **  but will return authtime == 0.
2449                 */
2450                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2451                                         &authtime, &kssl_err)) != 0)
2452                         {
2453 #ifdef KSSL_DEBUG
2454                         printf("kssl_check_authent rtn %d [%d]\n",
2455                                 krb5rc, kssl_err.reason);
2456                         if (kssl_err.text)
2457                                 printf("kssl_err text= %s\n", kssl_err.text);
2458 #endif  /* KSSL_DEBUG */
2459                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2460                                 kssl_err.reason);
2461                         goto err;
2462                         }
2463
2464                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2465                         {
2466                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2467                         goto err;
2468                         }
2469
2470 #ifdef KSSL_DEBUG
2471                 kssl_ctx_show(kssl_ctx);
2472 #endif  /* KSSL_DEBUG */
2473
2474                 enc = kssl_map_enc(kssl_ctx->enctype);
2475                 if (enc == NULL)
2476                     goto err;
2477
2478                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2479
2480                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2481                         {
2482                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2483                                 SSL_R_DECRYPTION_FAILED);
2484                         goto err;
2485                         }
2486                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2487                                         (unsigned char *)enc_pms.data, enc_pms.length))
2488                         {
2489                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2490                                 SSL_R_DECRYPTION_FAILED);
2491                         goto err;
2492                         }
2493                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2494                         {
2495                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2496                                 SSL_R_DATA_LENGTH_TOO_LONG);
2497                         goto err;
2498                         }
2499                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2500                         {
2501                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2502                                 SSL_R_DECRYPTION_FAILED);
2503                         goto err;
2504                         }
2505                 outl += padl;
2506                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2507                         {
2508                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2509                                 SSL_R_DATA_LENGTH_TOO_LONG);
2510                         goto err;
2511                         }
2512                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2513                     {
2514                     /* The premaster secret must contain the same version number as the
2515                      * ClientHello to detect version rollback attacks (strangely, the
2516                      * protocol does not offer such protection for DH ciphersuites).
2517                      * However, buggy clients exist that send random bytes instead of
2518                      * the protocol version.
2519                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2520                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2521                      */
2522                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2523                         {
2524                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2525                                SSL_AD_DECODE_ERROR);
2526                         goto err;
2527                         }
2528                     }
2529
2530                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2531
2532                 s->session->master_key_length=
2533                         s->method->ssl3_enc->generate_master_secret(s,
2534                                 s->session->master_key, pms, outl);
2535
2536                 if (kssl_ctx->client_princ)
2537                         {
2538                         size_t len = strlen(kssl_ctx->client_princ);
2539                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2540                                 {
2541                                 s->session->krb5_client_princ_len = len;
2542                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2543                                 }
2544                         }
2545
2546
2547                 /*  Was doing kssl_ctx_free() here,
2548                 **  but it caused problems for apache.
2549                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2550                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2551                 */
2552                 }
2553         else
2554 #endif  /* OPENSSL_NO_KRB5 */
2555
2556 #ifndef OPENSSL_NO_ECDH
2557                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2558                 {
2559                 int ret = 1;
2560                 int field_size = 0;
2561                 const EC_KEY   *tkey;
2562                 const EC_GROUP *group;
2563                 const BIGNUM *priv_key;
2564
2565                 /* initialize structures for server's ECDH key pair */
2566                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2567                         {
2568                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2569                             ERR_R_MALLOC_FAILURE);
2570                         goto err;
2571                         }
2572
2573                 /* Let's get server private key and group information */
2574                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2575                         {
2576                         /* use the certificate */
2577                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2578                         }
2579                 else
2580                         {
2581                         /* use the ephermeral values we saved when
2582                          * generating the ServerKeyExchange msg.
2583                          */
2584                         tkey = s->s3->tmp.ecdh;
2585                         }
2586
2587                 group    = EC_KEY_get0_group(tkey);
2588                 priv_key = EC_KEY_get0_private_key(tkey);
2589
2590                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2591                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2592                         {
2593                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2594                                ERR_R_EC_LIB);
2595                         goto err;
2596                         }
2597
2598                 /* Let's get client's public key */
2599                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2600                         {
2601                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2602                             ERR_R_MALLOC_FAILURE);
2603                         goto err;
2604                         }
2605
2606                 if (n == 0L)
2607                         {
2608                         /* Client Publickey was in Client Certificate */
2609
2610                          if (alg_k & SSL_kEECDH)
2611                                  {
2612                                  al=SSL_AD_HANDSHAKE_FAILURE;
2613                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2614                                  goto f_err;
2615                                  }
2616                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2617                             == NULL) ||
2618                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2619                                 {
2620                                 /* XXX: For now, we do not support client
2621                                  * authentication using ECDH certificates
2622                                  * so this branch (n == 0L) of the code is
2623                                  * never executed. When that support is
2624                                  * added, we ought to ensure the key
2625                                  * received in the certificate is
2626                                  * authorized for key agreement.
2627                                  * ECDH_compute_key implicitly checks that
2628                                  * the two ECDH shares are for the same
2629                                  * group.
2630                                  */
2631                                 al=SSL_AD_HANDSHAKE_FAILURE;
2632                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2633                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2634                                 goto f_err;
2635                                 }
2636
2637                         if (EC_POINT_copy(clnt_ecpoint,
2638                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2639                                 {
2640                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2641                                         ERR_R_EC_LIB);
2642                                 goto err;
2643                                 }
2644                         ret = 2; /* Skip certificate verify processing */
2645                         }
2646                 else
2647                         {
2648                         /* Get client's public key from encoded point
2649                          * in the ClientKeyExchange message.
2650                          */
2651                         if ((bn_ctx = BN_CTX_new()) == NULL)
2652                                 {
2653                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2654                                     ERR_R_MALLOC_FAILURE);
2655                                 goto err;
2656                                 }
2657
2658                         /* Get encoded point length */
2659                         i = *p;
2660                         p += 1;
2661                         if (n != 1 + i)
2662                                 {
2663                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2664                                     ERR_R_EC_LIB);
2665                                 goto err;
2666                                 }
2667                         if (EC_POINT_oct2point(group,
2668                             clnt_ecpoint, p, i, bn_ctx) == 0)
2669                                 {
2670                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2671                                     ERR_R_EC_LIB);
2672                                 goto err;
2673                                 }
2674                         /* p is pointing to somewhere in the buffer
2675                          * currently, so set it to the start
2676                          */
2677                         p=(unsigned char *)s->init_buf->data;
2678                         }
2679
2680                 /* Compute the shared pre-master secret */
2681                 field_size = EC_GROUP_get_degree(group);
2682                 if (field_size <= 0)
2683                         {
2684                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2685                                ERR_R_ECDH_LIB);
2686                         goto err;
2687                         }
2688                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2689                 if (i <= 0)
2690                         {
2691                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2692                             ERR_R_ECDH_LIB);
2693                         goto err;
2694                         }
2695
2696                 EVP_PKEY_free(clnt_pub_pkey);
2697                 EC_POINT_free(clnt_ecpoint);
2698                 EC_KEY_free(srvr_ecdh);
2699                 BN_CTX_free(bn_ctx);
2700                 EC_KEY_free(s->s3->tmp.ecdh);
2701                 s->s3->tmp.ecdh = NULL;
2702
2703                 /* Compute the master secret */
2704                 s->session->master_key_length = s->method->ssl3_enc-> \
2705                     generate_master_secret(s, s->session->master_key, p, i);
2706
2707                 OPENSSL_cleanse(p, i);
2708                 return (ret);
2709                 }
2710         else
2711 #endif
2712 #ifndef OPENSSL_NO_PSK
2713                 if (alg_k & SSL_kPSK)
2714                         {
2715                         unsigned char *t = NULL;
2716                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2717                         unsigned int pre_ms_len = 0, psk_len = 0;
2718                         int psk_err = 1;
2719                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2720
2721                         al=SSL_AD_HANDSHAKE_FAILURE;
2722
2723                         n2s(p,i);
2724                         if (n != i+2)
2725                                 {
2726                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2727                                         SSL_R_LENGTH_MISMATCH);
2728                                 goto psk_err;
2729                                 }
2730                         if (i > PSK_MAX_IDENTITY_LEN)
2731                                 {
2732                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2733                                         SSL_R_DATA_LENGTH_TOO_LONG);
2734                                 goto psk_err;
2735                                 }
2736                         if (s->psk_server_callback == NULL)
2737                                 {
2738                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2739                                        SSL_R_PSK_NO_SERVER_CB);
2740                                 goto psk_err;
2741                                 }
2742
2743                         /* Create guaranteed NULL-terminated identity
2744                          * string for the callback */
2745                         memcpy(tmp_id, p, i);
2746                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2747                         psk_len = s->psk_server_callback(s, tmp_id,
2748                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2749                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2750
2751                         if (psk_len > PSK_MAX_PSK_LEN)
2752                                 {
2753                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2754                                         ERR_R_INTERNAL_ERROR);
2755                                 goto psk_err;
2756                                 }
2757                         else if (psk_len == 0)
2758                                 {
2759                                 /* PSK related to the given identity not found */
2760                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2761                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2762                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2763                                 goto psk_err;
2764                                 }
2765
2766                         /* create PSK pre_master_secret */
2767                         pre_ms_len=2+psk_len+2+psk_len;
2768                         t = psk_or_pre_ms;
2769                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2770                         s2n(psk_len, t);
2771                         memset(t, 0, psk_len);
2772                         t+=psk_len;
2773                         s2n(psk_len, t);
2774
2775                         if (s->session->psk_identity != NULL)
2776                                 OPENSSL_free(s->session->psk_identity);
2777                         s->session->psk_identity = BUF_strdup((char *)p);
2778                         if (s->session->psk_identity == NULL)
2779                                 {
2780                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2781                                         ERR_R_MALLOC_FAILURE);
2782                                 goto psk_err;
2783                                 }
2784
2785                         if (s->session->psk_identity_hint != NULL)
2786                                 OPENSSL_free(s->session->psk_identity_hint);
2787                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2788                         if (s->ctx->psk_identity_hint != NULL &&
2789                                 s->session->psk_identity_hint == NULL)
2790                                 {
2791                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2792                                         ERR_R_MALLOC_FAILURE);
2793                                 goto psk_err;
2794                                 }
2795
2796                         s->session->master_key_length=
2797                                 s->method->ssl3_enc->generate_master_secret(s,
2798                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2799                         psk_err = 0;
2800                 psk_err:
2801                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2802                         if (psk_err != 0)
2803                                 goto f_err;
2804                         }
2805                 else
2806 #endif
2807 #ifndef OPENSSL_NO_SRP
2808                 if (alg_k & SSL_kSRP)
2809                         {
2810                         int param_len;
2811
2812                         n2s(p,i);
2813                         param_len=i+2;
2814                         if (param_len > n)
2815                                 {
2816                                 al=SSL_AD_DECODE_ERROR;
2817                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2818                                 goto f_err;
2819                                 }
2820                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2821                                 {
2822                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2823                                 goto err;
2824                                 }
2825                         if (s->session->srp_username != NULL)
2826                                 OPENSSL_free(s->session->srp_username);
2827                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2828                         if (s->session->srp_username == NULL)
2829                                 {
2830                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2831                                         ERR_R_MALLOC_FAILURE);
2832                                 goto err;
2833                                 }
2834
2835                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2836                                 {
2837                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2838                                 goto err;
2839                                 }
2840
2841                         p+=i;
2842                         }
2843                 else
2844 #endif  /* OPENSSL_NO_SRP */
2845                 if (alg_k & SSL_kGOST)
2846                         {
2847                         int ret = 0;
2848                         EVP_PKEY_CTX *pkey_ctx;
2849                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2850                         unsigned char premaster_secret[32], *start;
2851                         size_t outlen=32, inlen;
2852                         unsigned long alg_a;
2853
2854                         /* Get our certificate private key*/
2855                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2856                         if (alg_a & SSL_aGOST94)
2857                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2858                         else if (alg_a & SSL_aGOST01)
2859                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2860
2861                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2862                         EVP_PKEY_decrypt_init(pkey_ctx);
2863                         /* If client certificate is present and is of the same type, maybe
2864                          * use it for key exchange.  Don't mind errors from
2865                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2866                          * a client certificate for authorization only. */
2867                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2868                         if (client_pub_pkey)
2869                                 {
2870                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2871                                         ERR_clear_error();
2872                                 }
2873                         /* Decrypt session key */
2874                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED)))
2875                                 {
2876                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2877                                 goto gerr;
2878                                 }
2879                         if (p[1] == 0x81)
2880                                 {
2881                                 start = p+3;
2882                                 inlen = p[2];
2883                                 }
2884                         else if (p[1] < 0x80)
2885                                 {
2886                                 start = p+2;
2887                                 inlen = p[1];
2888                                 }
2889                         else
2890                                 {
2891                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2892                                 goto gerr;
2893                                 }
2894                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
2895
2896                                 {
2897                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2898                                 goto gerr;
2899                                 }
2900                         /* Generate master secret */
2901                         s->session->master_key_length=
2902                                 s->method->ssl3_enc->generate_master_secret(s,
2903                                         s->session->master_key,premaster_secret,32);
2904                         /* Check if pubkey from client certificate was used */
2905                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2906                                 ret = 2;
2907                         else
2908                                 ret = 1;
2909                 gerr:
2910                         EVP_PKEY_free(client_pub_pkey);
2911                         EVP_PKEY_CTX_free(pkey_ctx);
2912                         if (ret)
2913                                 return ret;
2914                         else
2915                                 goto err;
2916                         }
2917                 else
2918                 {
2919                 al=SSL_AD_HANDSHAKE_FAILURE;
2920                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2921                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2922                 goto f_err;
2923                 }
2924
2925         return(1);
2926 f_err:
2927         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2928 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
2929 err:
2930 #endif
2931 #ifndef OPENSSL_NO_ECDH
2932         EVP_PKEY_free(clnt_pub_pkey);
2933         EC_POINT_free(clnt_ecpoint);
2934         if (srvr_ecdh != NULL)
2935                 EC_KEY_free(srvr_ecdh);
2936         BN_CTX_free(bn_ctx);
2937 #endif
2938         return(-1);
2939         }
2940
2941 int ssl3_get_cert_verify(SSL *s)
2942         {
2943         EVP_PKEY *pkey=NULL;
2944         unsigned char *p;
2945         int al,ok,ret=0;
2946         long n;
2947         int type=0,i,j;
2948         X509 *peer;
2949         const EVP_MD *md = NULL;
2950         EVP_MD_CTX mctx;
2951         EVP_MD_CTX_init(&mctx);
2952
2953         n=s->method->ssl_get_message(s,
2954                 SSL3_ST_SR_CERT_VRFY_A,
2955                 SSL3_ST_SR_CERT_VRFY_B,
2956                 -1,
2957                 516, /* Enough for 4096 bit RSA key with TLS v1.2 */
2958                 &ok);
2959
2960         if (!ok) return((int)n);
2961
2962         if (s->session->peer != NULL)
2963                 {
2964                 peer=s->session->peer;
2965                 pkey=X509_get_pubkey(peer);
2966                 type=X509_certificate_type(peer,pkey);
2967                 }
2968         else
2969                 {
2970                 peer=NULL;
2971                 pkey=NULL;
2972                 }
2973
2974         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2975                 {
2976                 s->s3->tmp.reuse_message=1;
2977                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2978                         {
2979                         al=SSL_AD_UNEXPECTED_MESSAGE;
2980                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2981                         goto f_err;
2982                         }
2983                 ret=1;
2984                 goto end;
2985                 }
2986
2987         if (peer == NULL)
2988                 {
2989                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2990                 al=SSL_AD_UNEXPECTED_MESSAGE;
2991                 goto f_err;
2992                 }
2993
2994         if (!(type & EVP_PKT_SIGN))
2995                 {
2996                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2997                 al=SSL_AD_ILLEGAL_PARAMETER;
2998                 goto f_err;
2999                 }
3000
3001         if (s->s3->change_cipher_spec)
3002                 {
3003                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
3004                 al=SSL_AD_UNEXPECTED_MESSAGE;
3005                 goto f_err;
3006                 }
3007
3008         /* we now have a signature that we need to verify */
3009         p=(unsigned char *)s->init_msg;
3010         /* Check for broken implementations of GOST ciphersuites */
3011         /* If key is GOST and n is exactly 64, it is bare
3012          * signature without length field */
3013         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
3014                 pkey->type == NID_id_GostR3410_2001) )
3015                 {
3016                 i=64;
3017                 }
3018         else
3019                 {
3020                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
3021                         {
3022                         int sigalg = tls12_get_sigid(pkey);
3023                         /* Should never happen */
3024                         if (sigalg == -1)
3025                                 {
3026                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3027                                 al=SSL_AD_INTERNAL_ERROR;
3028                                 goto f_err;
3029                                 }
3030                         /* Check key type is consistent with signature */
3031                         if (sigalg != (int)p[1])
3032                                 {
3033                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_TYPE);
3034                                 al=SSL_AD_DECODE_ERROR;
3035                                 goto f_err;
3036                                 }
3037                         md = tls12_get_hash(p[0]);
3038                         if (md == NULL)
3039                                 {
3040                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_UNKNOWN_DIGEST);
3041                                 al=SSL_AD_DECODE_ERROR;
3042                                 goto f_err;
3043                                 }
3044 #ifdef SSL_DEBUG
3045 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3046 #endif
3047                         p += 2;
3048                         n -= 2;
3049                         }
3050                 n2s(p,i);
3051                 n-=2;
3052                 if (i > n)
3053                         {
3054                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3055                         al=SSL_AD_DECODE_ERROR;
3056                         goto f_err;
3057                         }
3058         }
3059         j=EVP_PKEY_size(pkey);
3060         if ((i > j) || (n > j) || (n <= 0))
3061                 {
3062                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3063                 al=SSL_AD_DECODE_ERROR;
3064                 goto f_err;
3065                 }
3066
3067         if (TLS1_get_version(s) >= TLS1_2_VERSION)
3068                 {
3069                 long hdatalen = 0;
3070                 void *hdata;
3071                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3072                 if (hdatalen <= 0)
3073                         {
3074                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3075                         al=SSL_AD_INTERNAL_ERROR;
3076                         goto f_err;
3077                         }
3078 #ifdef SSL_DEBUG
3079                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3080                                                         EVP_MD_name(md));
3081 #endif
3082                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3083                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3084                         {
3085                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3086                         al=SSL_AD_INTERNAL_ERROR;
3087                         goto f_err;
3088                         }
3089
3090                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3091                         {
3092                         al=SSL_AD_DECRYPT_ERROR;
3093                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3094                         goto f_err;
3095                         }
3096                 }
3097         else
3098 #ifndef OPENSSL_NO_RSA
3099         if (pkey->type == EVP_PKEY_RSA)
3100                 {
3101                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3102                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
3103                                                         pkey->pkey.rsa);
3104                 if (i < 0)
3105                         {
3106                         al=SSL_AD_DECRYPT_ERROR;
3107                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3108                         goto f_err;
3109                         }
3110                 if (i == 0)
3111                         {
3112                         al=SSL_AD_DECRYPT_ERROR;
3113                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3114                         goto f_err;
3115                         }
3116                 }
3117         else
3118 #endif
3119 #ifndef OPENSSL_NO_DSA
3120                 if (pkey->type == EVP_PKEY_DSA)
3121                 {
3122                 j=DSA_verify(pkey->save_type,
3123                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3124                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3125                 if (j <= 0)
3126                         {
3127                         /* bad signature */
3128                         al=SSL_AD_DECRYPT_ERROR;
3129                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3130                         goto f_err;
3131                         }
3132                 }
3133         else
3134 #endif
3135 #ifndef OPENSSL_NO_ECDSA
3136                 if (pkey->type == EVP_PKEY_EC)
3137                 {
3138                 j=ECDSA_verify(pkey->save_type,
3139                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3140                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3141                 if (j <= 0)
3142                         {
3143                         /* bad signature */
3144                         al=SSL_AD_DECRYPT_ERROR;
3145                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3146                             SSL_R_BAD_ECDSA_SIGNATURE);
3147                         goto f_err;
3148                         }
3149                 }
3150         else
3151 #endif
3152         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3153                 {   unsigned char signature[64];
3154                         int idx;
3155                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3156                         EVP_PKEY_verify_init(pctx);
3157                         if (i!=64) {
3158                                 fprintf(stderr,"GOST signature length is %d",i);
3159                         }
3160                         for (idx=0;idx<64;idx++) {
3161                                 signature[63-idx]=p[idx];
3162                         }
3163                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3164                         EVP_PKEY_CTX_free(pctx);
3165                         if (j<=0)
3166                                 {
3167                                 al=SSL_AD_DECRYPT_ERROR;
3168                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3169                                         SSL_R_BAD_ECDSA_SIGNATURE);
3170                                 goto f_err;
3171                                 }
3172                 }
3173         else
3174                 {
3175                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3176                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3177                 goto f_err;
3178                 }
3179
3180
3181         ret=1;
3182         if (0)
3183                 {
3184 f_err:
3185                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3186                 }
3187 end:
3188         if (s->s3->handshake_buffer)
3189                 {
3190                 BIO_free(s->s3->handshake_buffer);
3191                 s->s3->handshake_buffer = NULL;
3192                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3193                 }
3194         EVP_MD_CTX_cleanup(&mctx);
3195         EVP_PKEY_free(pkey);
3196         return(ret);
3197         }
3198
3199 int ssl3_get_client_certificate(SSL *s)
3200         {
3201         int i,ok,al,ret= -1;
3202         X509 *x=NULL;
3203         unsigned long l,nc,llen,n;
3204         const unsigned char *p,*q;
3205         unsigned char *d;
3206         STACK_OF(X509) *sk=NULL;
3207
3208         n=s->method->ssl_get_message(s,
3209                 SSL3_ST_SR_CERT_A,
3210                 SSL3_ST_SR_CERT_B,
3211                 -1,
3212                 s->max_cert_list,
3213                 &ok);
3214
3215         if (!ok) return((int)n);
3216
3217         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3218                 {
3219                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3220                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3221                         {
3222                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3223                         al=SSL_AD_HANDSHAKE_FAILURE;
3224                         goto f_err;
3225                         }
3226                 /* If tls asked for a client cert, the client must return a 0 list */
3227                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3228                         {
3229                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3230                         al=SSL_AD_UNEXPECTED_MESSAGE;
3231                         goto f_err;
3232                         }
3233                 s->s3->tmp.reuse_message=1;
3234                 return(1);
3235                 }
3236
3237         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3238                 {
3239                 al=SSL_AD_UNEXPECTED_MESSAGE;
3240                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3241                 goto f_err;
3242                 }
3243         p=d=(unsigned char *)s->init_msg;
3244
3245         if ((sk=sk_X509_new_null()) == NULL)
3246                 {
3247                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3248                 goto err;
3249                 }
3250
3251         n2l3(p,llen);
3252         if (llen+3 != n)
3253                 {
3254                 al=SSL_AD_DECODE_ERROR;
3255                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3256                 goto f_err;
3257                 }
3258         for (nc=0; nc<llen; )
3259                 {
3260                 n2l3(p,l);
3261                 if ((l+nc+3) > llen)
3262                         {
3263                         al=SSL_AD_DECODE_ERROR;
3264                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3265                         goto f_err;
3266                         }
3267
3268                 q=p;
3269                 x=d2i_X509(NULL,&p,l);
3270                 if (x == NULL)
3271                         {
3272                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3273                         goto err;
3274                         }
3275                 if (p != (q+l))
3276                         {
3277                         al=SSL_AD_DECODE_ERROR;
3278                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3279                         goto f_err;
3280                         }
3281                 if (!sk_X509_push(sk,x))
3282                         {
3283                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3284                         goto err;
3285                         }
3286                 x=NULL;
3287                 nc+=l+3;
3288                 }
3289
3290         if (sk_X509_num(sk) <= 0)
3291                 {
3292                 /* TLS does not mind 0 certs returned */
3293                 if (s->version == SSL3_VERSION)
3294                         {
3295                         al=SSL_AD_HANDSHAKE_FAILURE;
3296                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3297                         goto f_err;
3298                         }
3299                 /* Fail for TLS only if we required a certificate */
3300                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3301                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3302                         {
3303                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3304                         al=SSL_AD_HANDSHAKE_FAILURE;
3305                         goto f_err;
3306                         }
3307                 /* No client certificate so digest cached records */
3308                 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s))
3309                         {
3310                         al=SSL_AD_INTERNAL_ERROR;
3311                         goto f_err;
3312                         }
3313                 }
3314         else
3315                 {
3316                 i=ssl_verify_cert_chain(s,sk);
3317                 if (i <= 0)
3318                         {
3319                         al=ssl_verify_alarm_type(s->verify_result);
3320                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
3321                         goto f_err;
3322                         }
3323                 }
3324
3325         if (s->session->peer != NULL) /* This should not be needed */
3326                 X509_free(s->session->peer);
3327         s->session->peer=sk_X509_shift(sk);
3328         s->session->verify_result = s->verify_result;
3329
3330         /* With the current implementation, sess_cert will always be NULL
3331          * when we arrive here. */
3332         if (s->session->sess_cert == NULL)
3333                 {
3334                 s->session->sess_cert = ssl_sess_cert_new();
3335                 if (s->session->sess_cert == NULL)
3336                         {
3337                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3338                         goto err;
3339                         }
3340                 }
3341         if (s->session->sess_cert->cert_chain != NULL)
3342                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3343         s->session->sess_cert->cert_chain=sk;
3344         /* Inconsistency alert: cert_chain does *not* include the
3345          * peer's own certificate, while we do include it in s3_clnt.c */
3346
3347         sk=NULL;
3348
3349         ret=1;
3350         if (0)
3351                 {
3352 f_err:
3353                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3354                 }
3355 err:
3356         if (x != NULL) X509_free(x);
3357         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3358         return(ret);
3359         }
3360
3361 int ssl3_send_server_certificate(SSL *s)
3362         {
3363         unsigned long l;
3364         CERT_PKEY *cpk;
3365
3366         if (s->state == SSL3_ST_SW_CERT_A)
3367                 {
3368                 cpk=ssl_get_server_send_pkey(s);
3369                 if (cpk == NULL)
3370                         {
3371                         /* VRS: allow null cert if auth == KRB5 */
3372                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3373                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3374                                 {
3375                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3376                                 return(0);
3377                                 }
3378                         }
3379
3380                 l=ssl3_output_cert_chain(s,cpk);
3381                 s->state=SSL3_ST_SW_CERT_B;
3382                 s->init_num=(int)l;
3383                 s->init_off=0;
3384                 }
3385
3386         /* SSL3_ST_SW_CERT_B */
3387         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3388         }
3389
3390 #ifndef OPENSSL_NO_TLSEXT
3391 /* send a new session ticket (not necessarily for a new session) */
3392 int ssl3_send_newsession_ticket(SSL *s)
3393         {
3394         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3395                 {
3396                 unsigned char *p, *senc, *macstart;
3397                 const unsigned char *const_p;
3398                 int len, slen_full, slen;
3399                 SSL_SESSION *sess;
3400                 unsigned int hlen;
3401                 EVP_CIPHER_CTX ctx;
3402                 HMAC_CTX hctx;
3403                 SSL_CTX *tctx = s->initial_ctx;
3404                 unsigned char iv[EVP_MAX_IV_LENGTH];
3405                 unsigned char key_name[16];
3406
3407                 /* get session encoding length */
3408                 slen_full = i2d_SSL_SESSION(s->session, NULL);
3409                 /* Some length values are 16 bits, so forget it if session is
3410                  * too long
3411                  */
3412                 if (slen_full > 0xFF00)
3413                         return -1;
3414                 senc = OPENSSL_malloc(slen_full);
3415                 if (!senc)
3416                         return -1;
3417                 p = senc;
3418                 i2d_SSL_SESSION(s->session, &p);
3419
3420                 /* create a fresh copy (not shared with other threads) to clean up */
3421                 const_p = senc;
3422                 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3423                 if (sess == NULL)
3424                         {
3425                         OPENSSL_free(senc);
3426                         return -1;
3427                         }
3428                 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
3429
3430                 slen = i2d_SSL_SESSION(sess, NULL);
3431                 if (slen > slen_full) /* shouldn't ever happen */
3432                         {
3433                         OPENSSL_free(senc);
3434                         return -1;
3435                         }
3436                 p = senc;
3437                 i2d_SSL_SESSION(sess, &p);
3438                 SSL_SESSION_free(sess);
3439
3440                 /* Grow buffer if need be: the length calculation is as
3441                  * follows 1 (size of message name) + 3 (message length
3442                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
3443                  * 16 (key name) + max_iv_len (iv length) +
3444                  * session_length + max_enc_block_size (max encrypted session
3445                  * length) + max_md_size (HMAC).
3446                  */
3447                 if (!BUF_MEM_grow(s->init_buf,
3448                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
3449                         EVP_MAX_MD_SIZE + slen))
3450                         return -1;
3451
3452                 p=(unsigned char *)s->init_buf->data;
3453                 /* do the header */
3454                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
3455                 /* Skip message length for now */
3456                 p += 3;
3457                 EVP_CIPHER_CTX_init(&ctx);
3458                 HMAC_CTX_init(&hctx);
3459                 /* Initialize HMAC and cipher contexts. If callback present
3460                  * it does all the work otherwise use generated values
3461                  * from parent ctx.
3462                  */
3463                 if (tctx->tlsext_ticket_key_cb)
3464                         {
3465                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3466                                                          &hctx, 1) < 0)
3467                                 {
3468                                 OPENSSL_free(senc);
3469                                 return -1;
3470                                 }
3471                         }
3472                 else
3473                         {
3474                         RAND_pseudo_bytes(iv, 16);
3475                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3476                                         tctx->tlsext_tick_aes_key, iv);
3477                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3478                                         tlsext_tick_md(), NULL);
3479                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3480                         }
3481
3482                 /* Ticket lifetime hint (advisory only):
3483                  * We leave this unspecified for resumed session (for simplicity),
3484                  * and guess that tickets for new sessions will live as long
3485                  * as their sessions. */
3486                 l2n(s->hit ? 0 : s->session->timeout, p);
3487
3488                 /* Skip ticket length for now */
3489                 p += 2;
3490                 /* Output key name */
3491                 macstart = p;
3492                 memcpy(p, key_name, 16);
3493                 p += 16;
3494                 /* output IV */
3495                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3496                 p += EVP_CIPHER_CTX_iv_length(&ctx);
3497                 /* Encrypt session data */
3498                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3499                 p += len;
3500                 EVP_EncryptFinal(&ctx, p, &len);
3501                 p += len;
3502                 EVP_CIPHER_CTX_cleanup(&ctx);
3503
3504                 HMAC_Update(&hctx, macstart, p - macstart);
3505                 HMAC_Final(&hctx, p, &hlen);
3506                 HMAC_CTX_cleanup(&hctx);
3507
3508                 p += hlen;
3509                 /* Now write out lengths: p points to end of data written */
3510                 /* Total length */
3511                 len = p - (unsigned char *)s->init_buf->data;
3512                 p=(unsigned char *)s->init_buf->data + 1;
3513                 l2n3(len - 4, p); /* Message length */
3514                 p += 4;
3515                 s2n(len - 10, p);  /* Ticket length */
3516
3517                 /* number of bytes to write */
3518                 s->init_num= len;
3519                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3520                 s->init_off=0;
3521                 OPENSSL_free(senc);
3522                 }
3523
3524         /* SSL3_ST_SW_SESSION_TICKET_B */
3525         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3526         }
3527
3528 int ssl3_send_cert_status(SSL *s)
3529         {
3530         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3531                 {
3532                 unsigned char *p;
3533                 /* Grow buffer if need be: the length calculation is as
3534                  * follows 1 (message type) + 3 (message length) +
3535                  * 1 (ocsp response type) + 3 (ocsp response length)
3536                  * + (ocsp response)
3537                  */
3538                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3539                         return -1;
3540
3541                 p=(unsigned char *)s->init_buf->data;
3542
3543                 /* do the header */
3544                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3545                 /* message length */
3546                 l2n3(s->tlsext_ocsp_resplen + 4, p);
3547                 /* status type */
3548                 *(p++)= s->tlsext_status_type;
3549                 /* length of OCSP response */
3550                 l2n3(s->tlsext_ocsp_resplen, p);
3551                 /* actual response */
3552                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3553                 /* number of bytes to write */
3554                 s->init_num = 8 + s->tlsext_ocsp_resplen;
3555                 s->state=SSL3_ST_SW_CERT_STATUS_B;
3556                 s->init_off = 0;
3557                 }
3558
3559         /* SSL3_ST_SW_CERT_STATUS_B */
3560         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3561         }
3562
3563 # ifndef OPENSSL_NO_NPN
3564 /* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It
3565  * sets the next_proto member in s if found */
3566 int ssl3_get_next_proto(SSL *s)
3567         {
3568         int ok;
3569         int proto_len, padding_len;
3570         long n;
3571         const unsigned char *p;
3572
3573         /* Clients cannot send a NextProtocol message if we didn't see the
3574          * extension in their ClientHello */
3575         if (!s->s3->next_proto_neg_seen)
3576                 {
3577                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION);
3578                 return -1;
3579                 }
3580
3581         n=s->method->ssl_get_message(s,
3582                 SSL3_ST_SR_NEXT_PROTO_A,
3583                 SSL3_ST_SR_NEXT_PROTO_B,
3584                 SSL3_MT_NEXT_PROTO,
3585                 514,  /* See the payload format below */
3586                 &ok);
3587
3588         if (!ok)
3589                 return((int)n);
3590
3591         /* s->state doesn't reflect whether ChangeCipherSpec has been received
3592          * in this handshake, but s->s3->change_cipher_spec does (will be reset
3593          * by ssl3_get_finished). */
3594         if (!s->s3->change_cipher_spec)
3595                 {
3596                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS);
3597                 return -1;
3598                 }
3599
3600         if (n < 2)
3601                 return 0;  /* The body must be > 1 bytes long */
3602
3603         p=(unsigned char *)s->init_msg;
3604
3605         /* The payload looks like:
3606          *   uint8 proto_len;
3607          *   uint8 proto[proto_len];
3608          *   uint8 padding_len;
3609          *   uint8 padding[padding_len];
3610          */
3611         proto_len = p[0];
3612         if (proto_len + 2 > s->init_num)
3613                 return 0;
3614         padding_len = p[proto_len + 1];
3615         if (proto_len + padding_len + 2 != s->init_num)
3616                 return 0;
3617
3618         s->next_proto_negotiated = OPENSSL_malloc(proto_len);
3619         if (!s->next_proto_negotiated)
3620                 {
3621                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,ERR_R_MALLOC_FAILURE);
3622                 return 0;
3623                 }
3624         memcpy(s->next_proto_negotiated, p + 1, proto_len);
3625         s->next_proto_negotiated_len = proto_len;
3626
3627         return 1;
3628         }
3629 # endif
3630 #endif