ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124 /* ====================================================================
 125  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 133  * support (see RFC 4279) to OpenSSL.
 134  *
 135  * No patent licenses or other rights except those expressly stated in
 136  * the OpenSSL open source license shall be deemed granted or received
 137  * expressly, by implication, estoppel, or otherwise.
 138  *
 139  * No assurances are provided by Nokia that the Contribution does not
 140  * infringe the patent or other intellectual property rights of any third
 141  * party or that the license provides you with all the necessary rights
 142  * to make use of the Contribution.
 143  *
 144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 148  * OTHERWISE.
 149  */
 150
 151 #define REUSE_CIPHER_BUG
 152 #define NETSCAPE_HANG_BUG
 153
 154 #include <stdio.h>
 155 #include "ssl_locl.h"
 156 #include "kssl_lcl.h"
 157 #include "../crypto/constant_time_locl.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
 302                         if (s->state != SSL_ST_RENEGOTIATE)
 303                                 {
 304                                 /* Ok, we now need to push on a buffering BIO so that
 305                                  * the output is sent in a way that TCP likes :-)
 306                                  */
 307                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 308
 309                                 ssl3_init_finished_mac(s);
 310                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 311                                 s->ctx->stats.sess_accept++;
 312                                 }
 313                         else if (!s->s3->send_connection_binding &&
 314                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
 315                                 {
 316                                 /* Server attempting to renegotiate with
 317                                  * client that doesn't support secure
 318                                  * renegotiation.
 319                                  */
 320                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
 321                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 322                                 ret = -1;
 323                                 goto end;
 324                                 }
 325                         else
 326                                 {
 327                                 /* s->state == SSL_ST_RENEGOTIATE,
 328                                  * we will just send a HelloRequest */
 329                                 s->ctx->stats.sess_accept_renegotiate++;
 330                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 331                                 }
 332                         break;
 333
 334                 case SSL3_ST_SW_HELLO_REQ_A:
 335                 case SSL3_ST_SW_HELLO_REQ_B:
 336
 337                         s->shutdown=0;
 338                         ret=ssl3_send_hello_request(s);
 339                         if (ret <= 0) goto end;
 340                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 341                         s->state=SSL3_ST_SW_FLUSH;
 342                         s->init_num=0;
 343
 344                         ssl3_init_finished_mac(s);
 345                         break;
 346
 347                 case SSL3_ST_SW_HELLO_REQ_C:
 348                         s->state=SSL_ST_OK;
 349                         break;
 350
 351                 case SSL3_ST_SR_CLNT_HELLO_A:
 352                 case SSL3_ST_SR_CLNT_HELLO_B:
 353                 case SSL3_ST_SR_CLNT_HELLO_C:
 354
 355                         s->shutdown=0;
 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|SSL_aKRB5|SSL_aSRP))
 415                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 416                                 {
 417                                 ret=ssl3_send_server_certificate(s);
 418                                 if (ret <= 0) goto end;
 419 #ifndef OPENSSL_NO_TLSEXT
 420                                 if (s->tlsext_status_expected)
 421                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 422                                 else
 423                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 424                                 }
 425                         else
 426                                 {
 427                                 skip = 1;
 428                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 429                                 }
 430 #else
 431                                 }
 432                         else
 433                                 skip=1;
 434
 435                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 436 #endif
 437                         s->init_num=0;
 438                         break;
 439
 440                 case SSL3_ST_SW_KEY_EXCH_A:
 441                 case SSL3_ST_SW_KEY_EXCH_B:
 442                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 443
 444                         /* clear this, it may get reset by
 445                          * send_server_key_exchange */
 446                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 447 #ifndef OPENSSL_NO_KRB5
 448                                 && !(alg_k & SSL_kKRB5)
 449 #endif /* OPENSSL_NO_KRB5 */
 450                                 )
 451                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 452                                  * even when forbidden by protocol specs
 453                                  * (handshake may fail as clients are not required to
 454                                  * be able to handle this) */
 455                                 s->s3->tmp.use_rsa_tmp=1;
 456                         else
 457                                 s->s3->tmp.use_rsa_tmp=0;
 458
 459
 460                         /* only send if a DH key exchange, fortezza or
 461                          * RSA but we have a sign only certificate
 462                          *
 463                          * PSK: may send PSK identity hints
 464                          *
 465                          * For ECC ciphersuites, we send a serverKeyExchange
 466                          * message only if the cipher suite is either
 467                          * ECDH-anon or ECDHE. In other cases, the
 468                          * server certificate contains the server's
 469                          * public key for key exchange.
 470                          */
 471                         if (s->s3->tmp.use_rsa_tmp
 472                         /* PSK: send ServerKeyExchange if PSK identity
 473                          * hint if provided */
 474 #ifndef OPENSSL_NO_PSK
 475                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 476 #endif
 477 #ifndef OPENSSL_NO_SRP
 478                             /* SRP: send ServerKeyExchange */
 479                             || (alg_k & SSL_kSRP)
 480 #endif
 481                             || (alg_k & (SSL_kDHr|SSL_kDHd|SSL_kEDH))
 482                             || (alg_k & SSL_kEECDH)
 483                             || ((alg_k & SSL_kRSA)
 484                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 485                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 486                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 487                                         )
 488                                     )
 489                                 )
 490                             )
 491                                 {
 492                                 ret=ssl3_send_server_key_exchange(s);
 493                                 if (ret <= 0) goto end;
 494                                 }
 495                         else
 496                                 skip=1;
 497
 498                         s->state=SSL3_ST_SW_CERT_REQ_A;
 499                         s->init_num=0;
 500                         break;
 501
 502                 case SSL3_ST_SW_CERT_REQ_A:
 503                 case SSL3_ST_SW_CERT_REQ_B:
 504                         if (/* don't request cert unless asked for it: */
 505                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 506                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 507                                  * don't request cert during re-negotiation: */
 508                                 ((s->session->peer != NULL) &&
 509                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 510                                 /* never request cert in anonymous ciphersuites
 511                                  * (see section "Certificate request" in SSL 3 drafts
 512                                  * and in RFC 2246): */
 513                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 514                                  /* ... except when the application insists on verification
 515                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 516                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 517                                  /* never request cert in Kerberos ciphersuites */
 518                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) ||
 519                                 /* don't request certificate for SRP auth */
 520                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP)
 521                                 /* With normal PSK Certificates and
 522                                  * Certificate Requests are omitted */
 523                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 524                                 {
 525                                 /* no cert request */
 526                                 skip=1;
 527                                 s->s3->tmp.cert_request=0;
 528                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 529                                 if (s->s3->handshake_buffer)
 530                                         if (!ssl3_digest_cached_records(s))
 531                                                 return -1;
 532                                 }
 533                         else
 534                                 {
 535                                 s->s3->tmp.cert_request=1;
 536                                 ret=ssl3_send_certificate_request(s);
 537                                 if (ret <= 0) goto end;
 538 #ifndef NETSCAPE_HANG_BUG
 539                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 540 #else
 541                                 s->state=SSL3_ST_SW_FLUSH;
 542                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 543 #endif
 544                                 s->init_num=0;
 545                                 }
 546                         break;
 547
 548                 case SSL3_ST_SW_SRVR_DONE_A:
 549                 case SSL3_ST_SW_SRVR_DONE_B:
 550                         ret=ssl3_send_server_done(s);
 551                         if (ret <= 0) goto end;
 552                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 553                         s->state=SSL3_ST_SW_FLUSH;
 554                         s->init_num=0;
 555                         break;
 556
 557                 case SSL3_ST_SW_FLUSH:
 558
 559                         /* This code originally checked to see if
 560                          * any data was pending using BIO_CTRL_INFO
 561                          * and then flushed. This caused problems
 562                          * as documented in PR#1939. The proposed
 563                          * fix doesn't completely resolve this issue
 564                          * as buggy implementations of BIO_CTRL_PENDING
 565                          * still exist. So instead we just flush
 566                          * unconditionally.
 567                          */
 568
 569                         s->rwstate=SSL_WRITING;
 570                         if (BIO_flush(s->wbio) <= 0)
 571                                 {
 572                                 ret= -1;
 573                                 goto end;
 574                                 }
 575                         s->rwstate=SSL_NOTHING;
 576
 577                         s->state=s->s3->tmp.next_state;
 578                         break;
 579
 580                 case SSL3_ST_SR_CERT_A:
 581                 case SSL3_ST_SR_CERT_B:
 582                         /* Check for second client hello (MS SGC) */
 583                         ret = ssl3_check_client_hello(s);
 584                         if (ret <= 0)
 585                                 goto end;
 586                         if (ret == 2)
 587                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 588                         else {
 589                                 if (s->s3->tmp.cert_request)
 590                                         {
 591                                         ret=ssl3_get_client_certificate(s);
 592                                         if (ret <= 0) goto end;
 593                                         }
 594                                 s->init_num=0;
 595                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 596                         }
 597                         break;
 598
 599                 case SSL3_ST_SR_KEY_EXCH_A:
 600                 case SSL3_ST_SR_KEY_EXCH_B:
 601                         ret=ssl3_get_client_key_exchange(s);
 602                         if (ret <= 0)
 603                                 goto end;
 604                         if (ret == 2)
 605                                 {
 606                                 /* For the ECDH ciphersuites when
 607                                  * the client sends its ECDH pub key in
 608                                  * a certificate, the CertificateVerify
 609                                  * message is not sent.
 610                                  * Also for GOST ciphersuites when
 611                                  * the client uses its key from the certificate
 612                                  * for key exchange.
 613                                  */
 614 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 615                                 s->state=SSL3_ST_SR_FINISHED_A;
 616 #else
 617                                 if (s->s3->next_proto_neg_seen)
 618                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
 619                                 else
 620                                         s->state=SSL3_ST_SR_FINISHED_A;
 621 #endif
 622                                 s->init_num = 0;
 623                                 }
 624                         else if (TLS1_get_version(s) >= TLS1_2_VERSION)
 625                                 {
 626                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 627                                 s->init_num=0;
 628                                 if (!s->session->peer)
 629                                         break;
 630                                 /* For TLS v1.2 freeze the handshake buffer
 631                                  * at this point and digest cached records.
 632                                  */
 633                                 if (!s->s3->handshake_buffer)
 634                                         {
 635                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
 636                                         return -1;
 637                                         }
 638                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
 639                                 if (!ssl3_digest_cached_records(s))
 640                                         return -1;
 641                                 }
 642                         else
 643                                 {
 644                                 int offset=0;
 645                                 int dgst_num;
 646
 647                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 648                                 s->init_num=0;
 649
 650                                 /* We need to get hashes here so if there is
 651                                  * a client cert, it can be verified
 652                                  * FIXME - digest processing for CertificateVerify
 653                                  * should be generalized. But it is next step
 654                                  */
 655                                 if (s->s3->handshake_buffer)
 656                                         if (!ssl3_digest_cached_records(s))
 657                                                 return -1;
 658                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
 659                                         if (s->s3->handshake_dgst[dgst_num])
 660                                                 {
 661                                                 int dgst_size;
 662
 663                                                 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]));
 664                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
 665                                                 if (dgst_size < 0)
 666                                                         {
 667                                                         ret = -1;
 668                                                         goto end;
 669                                                         }
 670                                                 offset+=dgst_size;
 671                                                 }
 672                                 }
 673                         break;
 674
 675                 case SSL3_ST_SR_CERT_VRFY_A:
 676                 case SSL3_ST_SR_CERT_VRFY_B:
 677
 678                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 679                         /* we should decide if we expected this one */
 680                         ret=ssl3_get_cert_verify(s);
 681                         if (ret <= 0) goto end;
 682
 683 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 684                         s->state=SSL3_ST_SR_FINISHED_A;
 685 #else
 686                         if (s->s3->next_proto_neg_seen)
 687                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
 688                         else
 689                                 s->state=SSL3_ST_SR_FINISHED_A;
 690 #endif
 691                         s->init_num=0;
 692                         break;
 693
 694 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 695                 case SSL3_ST_SR_NEXT_PROTO_A:
 696                 case SSL3_ST_SR_NEXT_PROTO_B:
 697                         ret=ssl3_get_next_proto(s);
 698                         if (ret <= 0) goto end;
 699                         s->init_num = 0;
 700                         s->state=SSL3_ST_SR_FINISHED_A;
 701                         break;
 702 #endif
 703
 704                 case SSL3_ST_SR_FINISHED_A:
 705                 case SSL3_ST_SR_FINISHED_B:
 706                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 707                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 708                                 SSL3_ST_SR_FINISHED_B);
 709                         if (ret <= 0) goto end;
 710                         if (s->hit)
 711                                 s->state=SSL_ST_OK;
 712 #ifndef OPENSSL_NO_TLSEXT
 713                         else if (s->tlsext_ticket_expected)
 714                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 715 #endif
 716                         else
 717                                 s->state=SSL3_ST_SW_CHANGE_A;
 718                         s->init_num=0;
 719                         break;
 720
 721 #ifndef OPENSSL_NO_TLSEXT
 722                 case SSL3_ST_SW_SESSION_TICKET_A:
 723                 case SSL3_ST_SW_SESSION_TICKET_B:
 724                         ret=ssl3_send_newsession_ticket(s);
 725                         if (ret <= 0) goto end;
 726                         s->state=SSL3_ST_SW_CHANGE_A;
 727                         s->init_num=0;
 728                         break;
 729
 730                 case SSL3_ST_SW_CERT_STATUS_A:
 731                 case SSL3_ST_SW_CERT_STATUS_B:
 732                         ret=ssl3_send_cert_status(s);
 733                         if (ret <= 0) goto end;
 734                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 735                         s->init_num=0;
 736                         break;
 737
 738 #endif
 739
 740                 case SSL3_ST_SW_CHANGE_A:
 741                 case SSL3_ST_SW_CHANGE_B:
 742
 743                         s->session->cipher=s->s3->tmp.new_cipher;
 744                         if (!s->method->ssl3_enc->setup_key_block(s))
 745                                 { ret= -1; goto end; }
 746
 747                         ret=ssl3_send_change_cipher_spec(s,
 748                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 749
 750                         if (ret <= 0) goto end;
 751                         s->state=SSL3_ST_SW_FINISHED_A;
 752                         s->init_num=0;
 753
 754                         if (!s->method->ssl3_enc->change_cipher_state(s,
 755                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 756                                 {
 757                                 ret= -1;
 758                                 goto end;
 759                                 }
 760
 761                         break;
 762
 763                 case SSL3_ST_SW_FINISHED_A:
 764                 case SSL3_ST_SW_FINISHED_B:
 765                         ret=ssl3_send_finished(s,
 766                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 767                                 s->method->ssl3_enc->server_finished_label,
 768                                 s->method->ssl3_enc->server_finished_label_len);
 769                         if (ret <= 0) goto end;
 770                         s->state=SSL3_ST_SW_FLUSH;
 771                         if (s->hit)
 772                                 {
 773 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 774                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 775 #else
 776                                 if (s->s3->next_proto_neg_seen)
 777                                         {
 778                                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 779                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
 780                                         }
 781                                 else
 782                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 783 #endif
 784                                 }
 785                         else
 786                                 s->s3->tmp.next_state=SSL_ST_OK;
 787                         s->init_num=0;
 788                         break;
 789
 790                 case SSL_ST_OK:
 791                         /* clean a few things up */
 792                         ssl3_cleanup_key_block(s);
 793
 794                         BUF_MEM_free(s->init_buf);
 795                         s->init_buf=NULL;
 796
 797                         /* remove buffering on output */
 798                         ssl_free_wbio_buffer(s);
 799
 800                         s->init_num=0;
 801
 802                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
 803                                 {
 804                                 s->renegotiate=0;
 805                                 s->new_session=0;
 806
 807                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 808
 809                                 s->ctx->stats.sess_accept_good++;
 810                                 /* s->server=1; */
 811                                 s->handshake_func=ssl3_accept;
 812
 813                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 814                                 }
 815
 816                         ret = 1;
 817                         goto end;
 818                         /* break; */
 819
 820                 default:
 821                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 822                         ret= -1;
 823                         goto end;
 824                         /* break; */
 825                         }
 826
 827                 if (!s->s3->tmp.reuse_message && !skip)
 828                         {
 829                         if (s->debug)
 830                                 {
 831                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 832                                         goto end;
 833                                 }
 834
 835
 836                         if ((cb != NULL) && (s->state != state))
 837                                 {
 838                                 new_state=s->state;
 839                                 s->state=state;
 840                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 841                                 s->state=new_state;
 842                                 }
 843                         }
 844                 skip=0;
 845                 }
 846 end:
 847         /* BIO_flush(s->wbio); */
 848
 849         s->in_handshake--;
 850         if (cb != NULL)
 851                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 852         return(ret);
 853         }
 854
 855 int ssl3_send_hello_request(SSL *s)
 856         {
 857         unsigned char *p;
 858
 859         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 860                 {
 861                 p=(unsigned char *)s->init_buf->data;
 862                 *(p++)=SSL3_MT_HELLO_REQUEST;
 863                 *(p++)=0;
 864                 *(p++)=0;
 865                 *(p++)=0;
 866
 867                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 868                 /* number of bytes to write */
 869                 s->init_num=4;
 870                 s->init_off=0;
 871                 }
 872
 873         /* SSL3_ST_SW_HELLO_REQ_B */
 874         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 875         }
 876
 877 int ssl3_check_client_hello(SSL *s)
 878         {
 879         int ok;
 880         long n;
 881
 882         /* this function is called when we really expect a Certificate message,
 883          * so permit appropriate message length */
 884         n=s->method->ssl_get_message(s,
 885                 SSL3_ST_SR_CERT_A,
 886                 SSL3_ST_SR_CERT_B,
 887                 -1,
 888                 s->max_cert_list,
 889                 &ok);
 890         if (!ok) return((int)n);
 891         s->s3->tmp.reuse_message = 1;
 892         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 893                 {
 894                 /* We only allow the client to restart the handshake once per
 895                  * negotiation. */
 896                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
 897                         {
 898                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
 899                         return -1;
 900                         }
 901                 /* Throw away what we have done so far in the current handshake,
 902                  * which will now be aborted. (A full SSL_clear would be too much.) */
 903 #ifndef OPENSSL_NO_DH
 904                 if (s->s3->tmp.dh != NULL)
 905                         {
 906                         DH_free(s->s3->tmp.dh);
 907                         s->s3->tmp.dh = NULL;
 908                         }
 909 #endif
 910 #ifndef OPENSSL_NO_ECDH
 911                 if (s->s3->tmp.ecdh != NULL)
 912                         {
 913                         EC_KEY_free(s->s3->tmp.ecdh);
 914                         s->s3->tmp.ecdh = NULL;
 915                         }
 916 #endif
 917                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
 918                 return 2;
 919                 }
 920         return 1;
 921 }
 922
 923 int ssl3_get_client_hello(SSL *s)
 924         {
 925         int i,j,ok,al,ret= -1;
 926         unsigned int cookie_len;
 927         long n;
 928         unsigned long id;
 929         unsigned char *p,*d,*q;
 930         SSL_CIPHER *c;
 931 #ifndef OPENSSL_NO_COMP
 932         SSL_COMP *comp=NULL;
 933 #endif
 934         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 935
 936         /* We do this so that we will respond with our native type.
 937          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 938          * This down switching should be handled by a different method.
 939          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 940          * TLSv1.
 941          */
 942         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
 943                 )
 944                 {
 945                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 946                 }
 947         s->first_packet=1;
 948         n=s->method->ssl_get_message(s,
 949                 SSL3_ST_SR_CLNT_HELLO_B,
 950                 SSL3_ST_SR_CLNT_HELLO_C,
 951                 SSL3_MT_CLIENT_HELLO,
 952                 SSL3_RT_MAX_PLAIN_LENGTH,
 953                 &ok);
 954
 955         if (!ok) return((int)n);
 956         s->first_packet=0;
 957         d=p=(unsigned char *)s->init_msg;
 958
 959         /* use version from inside client hello, not from record header
 960          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 961         s->client_version=(((int)p[0])<<8)|(int)p[1];
 962         p+=2;
 963
 964         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 965             (s->version != DTLS1_VERSION && s->client_version < s->version))
 966                 {
 967                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 968                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR &&
 969                         !s->enc_write_ctx && !s->write_hash)
 970                         {
 971                         /* similar to ssl3_get_record, send alert using remote version number */
 972                         s->version = s->client_version;
 973                         }
 974                 al = SSL_AD_PROTOCOL_VERSION;
 975                 goto f_err;
 976                 }
 977
 978         /* If we require cookies and this ClientHello doesn't
 979          * contain one, just return since we do not want to
 980          * allocate any memory yet. So check cookie length...
 981          */
 982         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
 983                 {
 984                 unsigned int session_length, cookie_length;
 985
 986                 session_length = *(p + SSL3_RANDOM_SIZE);
 987                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
 988
 989                 if (cookie_length == 0)
 990                         return 1;
 991                 }
 992
 993         /* load the client random */
 994         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 995         p+=SSL3_RANDOM_SIZE;
 996
 997         /* get the session-id */
 998         j= *(p++);
 999
1000         s->hit=0;
1001         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
1002          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
1003          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
1004          * than a change to default behavior so that applications relying on this for security
1005          * won't even compile against older library versions).
1006          *
1007          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1008          * renegotiation but not a new session (s->new_session remains unset): for servers,
1009          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1010          * setting will be ignored.
1011          */
1012         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1013                 {
1014                 if (!ssl_get_new_session(s,1))
1015                         goto err;
1016                 }
1017         else
1018                 {
1019                 i=ssl_get_prev_session(s, p, j, d + n);
1020                 if (i == 1)
1021                         { /* previous session */
1022                         s->hit=1;
1023                         }
1024                 else if (i == -1)
1025                         goto err;
1026                 else /* i == 0 */
1027                         {
1028                         if (!ssl_get_new_session(s,1))
1029                                 goto err;
1030                         }
1031                 }
1032
1033         p+=j;
1034
1035         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1036                 {
1037                 /* cookie stuff */
1038                 cookie_len = *(p++);
1039
1040                 /*
1041                  * The ClientHello may contain a cookie even if the
1042                  * HelloVerify message has not been sent--make sure that it
1043                  * does not cause an overflow.
1044                  */
1045                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1046                         {
1047                         /* too much data */
1048                         al = SSL_AD_DECODE_ERROR;
1049                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1050                         goto f_err;
1051                         }
1052
1053                 /* verify the cookie if appropriate option is set. */
1054                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1055                         cookie_len > 0)
1056                         {
1057                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1058
1059                         if ( s->ctx->app_verify_cookie_cb != NULL)
1060                                 {
1061                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1062                                         cookie_len) == 0)
1063                                         {
1064                                         al=SSL_AD_HANDSHAKE_FAILURE;
1065                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1066                                                 SSL_R_COOKIE_MISMATCH);
1067                                         goto f_err;
1068                                         }
1069                                 /* else cookie verification succeeded */
1070                                 }
1071                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
1072                                                   s->d1->cookie_len) != 0) /* default verification */
1073                                 {
1074                                         al=SSL_AD_HANDSHAKE_FAILURE;
1075                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1076                                                 SSL_R_COOKIE_MISMATCH);
1077                                         goto f_err;
1078                                 }
1079
1080                         ret = 2;
1081                         }
1082
1083                 p += cookie_len;
1084                 }
1085
1086         n2s(p,i);
1087         if ((i == 0) && (j != 0))
1088                 {
1089                 /* we need a cipher if we are not resuming a session */
1090                 al=SSL_AD_ILLEGAL_PARAMETER;
1091                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1092                 goto f_err;
1093                 }
1094         if ((p+i) >= (d+n))
1095                 {
1096                 /* not enough data */
1097                 al=SSL_AD_DECODE_ERROR;
1098                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1099                 goto f_err;
1100                 }
1101         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1102                 == NULL))
1103                 {
1104                 goto err;
1105                 }
1106         p+=i;
1107
1108         /* If it is a hit, check that the cipher is in the list */
1109         if ((s->hit) && (i > 0))
1110                 {
1111                 j=0;
1112                 id=s->session->cipher->id;
1113
1114 #ifdef CIPHER_DEBUG
1115                 printf("client sent %d ciphers\n",sk_num(ciphers));
1116 #endif
1117                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1118                         {
1119                         c=sk_SSL_CIPHER_value(ciphers,i);
1120 #ifdef CIPHER_DEBUG
1121                         printf("client [%2d of %2d]:%s\n",
1122                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1123 #endif
1124                         if (c->id == id)
1125                                 {
1126                                 j=1;
1127                                 break;
1128                                 }
1129                         }
1130 /* Disabled because it can be used in a ciphersuite downgrade
1131  * attack: CVE-2010-4180.
1132  */
1133 #if 0
1134                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1135                         {
1136                         /* Special case as client bug workaround: the previously used cipher may
1137                          * not be in the current list, the client instead might be trying to
1138                          * continue using a cipher that before wasn't chosen due to server
1139                          * preferences.  We'll have to reject the connection if the cipher is not
1140                          * enabled, though. */
1141                         c = sk_SSL_CIPHER_value(ciphers, 0);
1142                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1143                                 {
1144                                 s->session->cipher = c;
1145                                 j = 1;
1146                                 }
1147                         }
1148 #endif
1149                 if (j == 0)
1150                         {
1151                         /* we need to have the cipher in the cipher
1152                          * list if we are asked to reuse it */
1153                         al=SSL_AD_ILLEGAL_PARAMETER;
1154                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1155                         goto f_err;
1156                         }
1157                 }
1158
1159         /* compression */
1160         i= *(p++);
1161         if ((p+i) > (d+n))
1162                 {
1163                 /* not enough data */
1164                 al=SSL_AD_DECODE_ERROR;
1165                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1166                 goto f_err;
1167                 }
1168         q=p;
1169         for (j=0; j<i; j++)
1170                 {
1171                 if (p[j] == 0) break;
1172                 }
1173
1174         p+=i;
1175         if (j >= i)
1176                 {
1177                 /* no compress */
1178                 al=SSL_AD_DECODE_ERROR;
1179                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1180                 goto f_err;
1181                 }
1182
1183 #ifndef OPENSSL_NO_TLSEXT
1184         /* TLS extensions*/
1185         if (s->version >= SSL3_VERSION)
1186                 {
1187                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1188                         {
1189                         /* 'al' set by ssl_parse_clienthello_tlsext */
1190                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1191                         goto f_err;
1192                         }
1193                 }
1194                 if (ssl_check_clienthello_tlsext_early(s) <= 0) {
1195                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1196                         goto err;
1197                 }
1198
1199         /* Check if we want to use external pre-shared secret for this
1200          * handshake for not reused session only. We need to generate
1201          * server_random before calling tls_session_secret_cb in order to allow
1202          * SessionTicket processing to use it in key derivation. */
1203         {
1204                 unsigned char *pos;
1205                 pos=s->s3->server_random;
1206                 if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0)
1207                         {
1208                         al=SSL_AD_INTERNAL_ERROR;
1209                         goto f_err;
1210                         }
1211         }
1212
1213         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1214                 {
1215                 SSL_CIPHER *pref_cipher=NULL;
1216
1217                 s->session->master_key_length=sizeof(s->session->master_key);
1218                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1219                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1220                         {
1221                         s->hit=1;
1222                         s->session->ciphers=ciphers;
1223                         s->session->verify_result=X509_V_OK;
1224
1225                         ciphers=NULL;
1226
1227                         /* check if some cipher was preferred by call back */
1228                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1229                         if (pref_cipher == NULL)
1230                                 {
1231                                 al=SSL_AD_HANDSHAKE_FAILURE;
1232                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1233                                 goto f_err;
1234                                 }
1235
1236                         s->session->cipher=pref_cipher;
1237
1238                         if (s->cipher_list)
1239                                 sk_SSL_CIPHER_free(s->cipher_list);
1240
1241                         if (s->cipher_list_by_id)
1242                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1243
1244                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1245                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1246                         }
1247                 }
1248 #endif
1249
1250         /* Worst case, we will use the NULL compression, but if we have other
1251          * options, we will now look for them.  We have i-1 compression
1252          * algorithms from the client, starting at q. */
1253         s->s3->tmp.new_compression=NULL;
1254 #ifndef OPENSSL_NO_COMP
1255         /* This only happens if we have a cache hit */
1256         if (s->session->compress_meth != 0)
1257                 {
1258                 int m, comp_id = s->session->compress_meth;
1259                 /* Perform sanity checks on resumed compression algorithm */
1260                 /* Can't disable compression */
1261                 if (s->options & SSL_OP_NO_COMPRESSION)
1262                         {
1263                         al=SSL_AD_INTERNAL_ERROR;
1264                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1265                         goto f_err;
1266                         }
1267                 /* Look for resumed compression method */
1268                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1269                         {
1270                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1271                         if (comp_id == comp->id)
1272                                 {
1273                                 s->s3->tmp.new_compression=comp;
1274                                 break;
1275                                 }
1276                         }
1277                 if (s->s3->tmp.new_compression == NULL)
1278                         {
1279                         al=SSL_AD_INTERNAL_ERROR;
1280                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1281                         goto f_err;
1282                         }
1283                 /* Look for resumed method in compression list */
1284                 for (m = 0; m < i; m++)
1285                         {
1286                         if (q[m] == comp_id)
1287                                 break;
1288                         }
1289                 if (m >= i)
1290                         {
1291                         al=SSL_AD_ILLEGAL_PARAMETER;
1292                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1293                         goto f_err;
1294                         }
1295                 }
1296         else if (s->hit)
1297                 comp = NULL;
1298         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1299                 { /* See if we have a match */
1300                 int m,nn,o,v,done=0;
1301
1302                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1303                 for (m=0; m<nn; m++)
1304                         {
1305                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1306                         v=comp->id;
1307                         for (o=0; o<i; o++)
1308                                 {
1309                                 if (v == q[o])
1310                                         {
1311                                         done=1;
1312                                         break;
1313                                         }
1314                                 }
1315                         if (done) break;
1316                         }
1317                 if (done)
1318                         s->s3->tmp.new_compression=comp;
1319                 else
1320                         comp=NULL;
1321                 }
1322 #else
1323         /* If compression is disabled we'd better not try to resume a session
1324          * using compression.
1325          */
1326         if (s->session->compress_meth != 0)
1327                 {
1328                 al=SSL_AD_INTERNAL_ERROR;
1329                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1330                 goto f_err;
1331                 }
1332 #endif
1333
1334         /* Given s->session->ciphers and SSL_get_ciphers, we must
1335          * pick a cipher */
1336
1337         if (!s->hit)
1338                 {
1339 #ifdef OPENSSL_NO_COMP
1340                 s->session->compress_meth=0;
1341 #else
1342                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1343 #endif
1344                 if (s->session->ciphers != NULL)
1345                         sk_SSL_CIPHER_free(s->session->ciphers);
1346                 s->session->ciphers=ciphers;
1347                 if (ciphers == NULL)
1348                         {
1349                         al=SSL_AD_ILLEGAL_PARAMETER;
1350                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1351                         goto f_err;
1352                         }
1353                 ciphers=NULL;
1354                 c=ssl3_choose_cipher(s,s->session->ciphers,
1355                                      SSL_get_ciphers(s));
1356
1357                 if (c == NULL)
1358                         {
1359                         al=SSL_AD_HANDSHAKE_FAILURE;
1360                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1361                         goto f_err;
1362                         }
1363                 s->s3->tmp.new_cipher=c;
1364                 }
1365         else
1366                 {
1367                 /* Session-id reuse */
1368 #ifdef REUSE_CIPHER_BUG
1369                 STACK_OF(SSL_CIPHER) *sk;
1370                 SSL_CIPHER *nc=NULL;
1371                 SSL_CIPHER *ec=NULL;
1372
1373                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1374                         {
1375                         sk=s->session->ciphers;
1376                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1377                                 {
1378                                 c=sk_SSL_CIPHER_value(sk,i);
1379                                 if (c->algorithm_enc & SSL_eNULL)
1380                                         nc=c;
1381                                 if (SSL_C_IS_EXPORT(c))
1382                                         ec=c;
1383                                 }
1384                         if (nc != NULL)
1385                                 s->s3->tmp.new_cipher=nc;
1386                         else if (ec != NULL)
1387                                 s->s3->tmp.new_cipher=ec;
1388                         else
1389                                 s->s3->tmp.new_cipher=s->session->cipher;
1390                         }
1391                 else
1392 #endif
1393                 s->s3->tmp.new_cipher=s->session->cipher;
1394                 }
1395
1396         if (TLS1_get_version(s) < TLS1_2_VERSION || !(s->verify_mode & SSL_VERIFY_PEER))
1397                 {
1398                 if (!ssl3_digest_cached_records(s))
1399                         {
1400                         al = SSL_AD_INTERNAL_ERROR;
1401                         goto f_err;
1402                         }
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         /* Handles TLS extensions that we couldn't check earlier */
1417         if (s->version >= SSL3_VERSION)
1418                 {
1419                 if (ssl_check_clienthello_tlsext_late(s) <= 0)
1420                         {
1421                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1422                         goto err;
1423                         }
1424                 }
1425
1426         if (ret < 0) ret=1;
1427         if (0)
1428                 {
1429 f_err:
1430                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1431                 }
1432 err:
1433         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1434         return(ret);
1435         }
1436
1437 int ssl3_send_server_hello(SSL *s)
1438         {
1439         unsigned char *buf;
1440         unsigned char *p,*d;
1441         int i,sl;
1442         unsigned long l;
1443
1444         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1445                 {
1446                 buf=(unsigned char *)s->init_buf->data;
1447 #ifdef OPENSSL_NO_TLSEXT
1448                 p=s->s3->server_random;
1449                 if (ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE) <= 0)
1450                         return -1;
1451 #endif
1452                 /* Do the message type and length last */
1453                 d=p= &(buf[4]);
1454
1455                 *(p++)=s->version>>8;
1456                 *(p++)=s->version&0xff;
1457
1458                 /* Random stuff */
1459                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1460                 p+=SSL3_RANDOM_SIZE;
1461
1462                 /* There are several cases for the session ID to send
1463                  * back in the server hello:
1464                  * - For session reuse from the session cache,
1465                  *   we send back the old session ID.
1466                  * - If stateless session reuse (using a session ticket)
1467                  *   is successful, we send back the client's "session ID"
1468                  *   (which doesn't actually identify the session).
1469                  * - If it is a new session, we send back the new
1470                  *   session ID.
1471                  * - However, if we want the new session to be single-use,
1472                  *   we send back a 0-length session ID.
1473                  * s->hit is non-zero in either case of session reuse,
1474                  * so the following won't overwrite an ID that we're supposed
1475                  * to send back.
1476                  */
1477                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1478                         && !s->hit)
1479                         s->session->session_id_length=0;
1480
1481                 sl=s->session->session_id_length;
1482                 if (sl > (int)sizeof(s->session->session_id))
1483                         {
1484                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1485                         return -1;
1486                         }
1487                 *(p++)=sl;
1488                 memcpy(p,s->session->session_id,sl);
1489                 p+=sl;
1490
1491                 /* put the cipher */
1492                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1493                 p+=i;
1494
1495                 /* put the compression method */
1496 #ifdef OPENSSL_NO_COMP
1497                         *(p++)=0;
1498 #else
1499                 if (s->s3->tmp.new_compression == NULL)
1500                         *(p++)=0;
1501                 else
1502                         *(p++)=s->s3->tmp.new_compression->id;
1503 #endif
1504 #ifndef OPENSSL_NO_TLSEXT
1505                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1506                         {
1507                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1508                         return -1;
1509                         }
1510                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1511                         {
1512                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1513                         return -1;
1514                         }
1515 #endif
1516                 /* do the header */
1517                 l=(p-d);
1518                 d=buf;
1519                 *(d++)=SSL3_MT_SERVER_HELLO;
1520                 l2n3(l,d);
1521
1522                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1523                 /* number of bytes to write */
1524                 s->init_num=p-buf;
1525                 s->init_off=0;
1526                 }
1527
1528         /* SSL3_ST_SW_SRVR_HELLO_B */
1529         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1530         }
1531
1532 int ssl3_send_server_done(SSL *s)
1533         {
1534         unsigned char *p;
1535
1536         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1537                 {
1538                 p=(unsigned char *)s->init_buf->data;
1539
1540                 /* do the header */
1541                 *(p++)=SSL3_MT_SERVER_DONE;
1542                 *(p++)=0;
1543                 *(p++)=0;
1544                 *(p++)=0;
1545
1546                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1547                 /* number of bytes to write */
1548                 s->init_num=4;
1549                 s->init_off=0;
1550                 }
1551
1552         /* SSL3_ST_SW_SRVR_DONE_B */
1553         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1554         }
1555
1556 int ssl3_send_server_key_exchange(SSL *s)
1557         {
1558 #ifndef OPENSSL_NO_RSA
1559         unsigned char *q;
1560         int j,num;
1561         RSA *rsa;
1562         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1563         unsigned int u;
1564 #endif
1565 #ifndef OPENSSL_NO_DH
1566         DH *dh=NULL,*dhp;
1567 #endif
1568 #ifndef OPENSSL_NO_ECDH
1569         EC_KEY *ecdh=NULL, *ecdhp;
1570         unsigned char *encodedPoint = NULL;
1571         int encodedlen = 0;
1572         int curve_id = 0;
1573         BN_CTX *bn_ctx = NULL;
1574 #endif
1575         EVP_PKEY *pkey;
1576         const EVP_MD *md = NULL;
1577         unsigned char *p,*d;
1578         int al,i;
1579         unsigned long type;
1580         int n;
1581         CERT *cert;
1582         BIGNUM *r[4];
1583         int nr[4],kn;
1584         BUF_MEM *buf;
1585         EVP_MD_CTX md_ctx;
1586
1587         EVP_MD_CTX_init(&md_ctx);
1588         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1589                 {
1590                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1591                 cert=s->cert;
1592
1593                 buf=s->init_buf;
1594
1595                 r[0]=r[1]=r[2]=r[3]=NULL;
1596                 n=0;
1597 #ifndef OPENSSL_NO_RSA
1598                 if (type & SSL_kRSA)
1599                         {
1600                         rsa=cert->rsa_tmp;
1601                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1602                                 {
1603                                 rsa=s->cert->rsa_tmp_cb(s,
1604                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1605                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1606                                 if(rsa == NULL)
1607                                 {
1608                                         al=SSL_AD_HANDSHAKE_FAILURE;
1609                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1610                                         goto f_err;
1611                                 }
1612                                 RSA_up_ref(rsa);
1613                                 cert->rsa_tmp=rsa;
1614                                 }
1615                         if (rsa == NULL)
1616                                 {
1617                                 al=SSL_AD_HANDSHAKE_FAILURE;
1618                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1619                                 goto f_err;
1620                                 }
1621                         r[0]=rsa->n;
1622                         r[1]=rsa->e;
1623                         s->s3->tmp.use_rsa_tmp=1;
1624                         }
1625                 else
1626 #endif
1627 #ifndef OPENSSL_NO_DH
1628                         if (type & SSL_kEDH)
1629                         {
1630                         dhp=cert->dh_tmp;
1631                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1632                                 dhp=s->cert->dh_tmp_cb(s,
1633                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1634                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1635                         if (dhp == NULL)
1636                                 {
1637                                 al=SSL_AD_HANDSHAKE_FAILURE;
1638                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1639                                 goto f_err;
1640                                 }
1641
1642                         if (s->s3->tmp.dh != NULL)
1643                                 {
1644                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1645                                 goto err;
1646                                 }
1647
1648                         if ((dh=DHparams_dup(dhp)) == NULL)
1649                                 {
1650                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1651                                 goto err;
1652                                 }
1653
1654                         s->s3->tmp.dh=dh;
1655                         if ((dhp->pub_key == NULL ||
1656                              dhp->priv_key == NULL ||
1657                              (s->options & SSL_OP_SINGLE_DH_USE)))
1658                                 {
1659                                 if(!DH_generate_key(dh))
1660                                     {
1661                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1662                                            ERR_R_DH_LIB);
1663                                     goto err;
1664                                     }
1665                                 }
1666                         else
1667                                 {
1668                                 dh->pub_key=BN_dup(dhp->pub_key);
1669                                 dh->priv_key=BN_dup(dhp->priv_key);
1670                                 if ((dh->pub_key == NULL) ||
1671                                         (dh->priv_key == NULL))
1672                                         {
1673                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1674                                         goto err;
1675                                         }
1676                                 }
1677                         r[0]=dh->p;
1678                         r[1]=dh->g;
1679                         r[2]=dh->pub_key;
1680                         }
1681                 else
1682 #endif
1683 #ifndef OPENSSL_NO_ECDH
1684                         if (type & SSL_kEECDH)
1685                         {
1686                         const EC_GROUP *group;
1687
1688                         ecdhp=cert->ecdh_tmp;
1689                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1690                                 {
1691                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1692                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1693                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1694                                 }
1695                         if (ecdhp == NULL)
1696                                 {
1697                                 al=SSL_AD_HANDSHAKE_FAILURE;
1698                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1699                                 goto f_err;
1700                                 }
1701
1702                         if (s->s3->tmp.ecdh != NULL)
1703                                 {
1704                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1705                                 goto err;
1706                                 }
1707
1708                         /* Duplicate the ECDH structure. */
1709                         if (ecdhp == NULL)
1710                                 {
1711                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1712                                 goto err;
1713                                 }
1714                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1715                                 {
1716                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1717                                 goto err;
1718                                 }
1719
1720                         s->s3->tmp.ecdh=ecdh;
1721                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1722                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1723                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1724                                 {
1725                                 if(!EC_KEY_generate_key(ecdh))
1726                                     {
1727                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1728                                     goto err;
1729                                     }
1730                                 }
1731
1732                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1733                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1734                             (EC_KEY_get0_private_key(ecdh) == NULL))
1735                                 {
1736                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1737                                 goto err;
1738                                 }
1739
1740                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1741                             (EC_GROUP_get_degree(group) > 163))
1742                                 {
1743                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1744                                 goto err;
1745                                 }
1746
1747                         /* XXX: For now, we only support ephemeral ECDH
1748                          * keys over named (not generic) curves. For
1749                          * supported named curves, curve_id is non-zero.
1750                          */
1751                         if ((curve_id =
1752                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1753                             == 0)
1754                                 {
1755                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1756                                 goto err;
1757                                 }
1758
1759                         /* Encode the public key.
1760                          * First check the size of encoding and
1761                          * allocate memory accordingly.
1762                          */
1763                         encodedlen = EC_POINT_point2oct(group,
1764                             EC_KEY_get0_public_key(ecdh),
1765                             POINT_CONVERSION_UNCOMPRESSED,
1766                             NULL, 0, NULL);
1767
1768                         encodedPoint = (unsigned char *)
1769                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1770                         bn_ctx = BN_CTX_new();
1771                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1772                                 {
1773                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1774                                 goto err;
1775                                 }
1776
1777
1778                         encodedlen = EC_POINT_point2oct(group,
1779                             EC_KEY_get0_public_key(ecdh),
1780                             POINT_CONVERSION_UNCOMPRESSED,
1781                             encodedPoint, encodedlen, bn_ctx);
1782
1783                         if (encodedlen == 0)
1784                                 {
1785                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1786                                 goto err;
1787                                 }
1788
1789                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1790
1791                         /* XXX: For now, we only support named (not
1792                          * generic) curves in ECDH ephemeral key exchanges.
1793                          * In this situation, we need four additional bytes
1794                          * to encode the entire ServerECDHParams
1795                          * structure.
1796                          */
1797                         n = 4 + encodedlen;
1798
1799                         /* We'll generate the serverKeyExchange message
1800                          * explicitly so we can set these to NULLs
1801                          */
1802                         r[0]=NULL;
1803                         r[1]=NULL;
1804                         r[2]=NULL;
1805                         r[3]=NULL;
1806                         }
1807                 else
1808 #endif /* !OPENSSL_NO_ECDH */
1809 #ifndef OPENSSL_NO_PSK
1810                         if (type & SSL_kPSK)
1811                                 {
1812                                 /* reserve size for record length and PSK identity hint*/
1813                                 n+=2+strlen(s->ctx->psk_identity_hint);
1814                                 }
1815                         else
1816 #endif /* !OPENSSL_NO_PSK */
1817 #ifndef OPENSSL_NO_SRP
1818                 if (type & SSL_kSRP)
1819                         {
1820                         if ((s->srp_ctx.N == NULL) ||
1821                                 (s->srp_ctx.g == NULL) ||
1822                                 (s->srp_ctx.s == NULL) ||
1823                                 (s->srp_ctx.B == NULL))
1824                                 {
1825                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1826                                 goto err;
1827                                 }
1828                         r[0]=s->srp_ctx.N;
1829                         r[1]=s->srp_ctx.g;
1830                         r[2]=s->srp_ctx.s;
1831                         r[3]=s->srp_ctx.B;
1832                         }
1833                 else
1834 #endif
1835                         {
1836                         al=SSL_AD_HANDSHAKE_FAILURE;
1837                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1838                         goto f_err;
1839                         }
1840                 for (i=0; i < 4 && r[i] != NULL; i++)
1841                         {
1842                         nr[i]=BN_num_bytes(r[i]);
1843 #ifndef OPENSSL_NO_SRP
1844                         if ((i == 2) && (type & SSL_kSRP))
1845                                 n+=1+nr[i];
1846                         else
1847 #endif
1848                         n+=2+nr[i];
1849                         }
1850
1851                 if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP))
1852                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1853                         {
1854                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1855                                 == NULL)
1856                                 {
1857                                 al=SSL_AD_DECODE_ERROR;
1858                                 goto f_err;
1859                                 }
1860                         kn=EVP_PKEY_size(pkey);
1861                         }
1862                 else
1863                         {
1864                         pkey=NULL;
1865                         kn=0;
1866                         }
1867
1868                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1869                         {
1870                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1871                         goto err;
1872                         }
1873                 d=(unsigned char *)s->init_buf->data;
1874                 p= &(d[4]);
1875
1876                 for (i=0; i < 4 && r[i] != NULL; i++)
1877                         {
1878 #ifndef OPENSSL_NO_SRP
1879                         if ((i == 2) && (type & SSL_kSRP))
1880                                 {
1881                                 *p = nr[i];
1882                                 p++;
1883                                 }
1884                         else
1885 #endif
1886                         s2n(nr[i],p);
1887                         BN_bn2bin(r[i],p);
1888                         p+=nr[i];
1889                         }
1890
1891 #ifndef OPENSSL_NO_ECDH
1892                 if (type & SSL_kEECDH)
1893                         {
1894                         /* XXX: For now, we only support named (not generic) curves.
1895                          * In this situation, the serverKeyExchange message has:
1896                          * [1 byte CurveType], [2 byte CurveName]
1897                          * [1 byte length of encoded point], followed by
1898                          * the actual encoded point itself
1899                          */
1900                         *p = NAMED_CURVE_TYPE;
1901                         p += 1;
1902                         *p = 0;
1903                         p += 1;
1904                         *p = curve_id;
1905                         p += 1;
1906                         *p = encodedlen;
1907                         p += 1;
1908                         memcpy((unsigned char*)p,
1909                             (unsigned char *)encodedPoint,
1910                             encodedlen);
1911                         OPENSSL_free(encodedPoint);
1912                         encodedPoint = NULL;
1913                         p += encodedlen;
1914                         }
1915 #endif
1916
1917 #ifndef OPENSSL_NO_PSK
1918                 if (type & SSL_kPSK)
1919                         {
1920                         /* copy PSK identity hint */
1921                         s2n(strlen(s->ctx->psk_identity_hint), p);
1922                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1923                         p+=strlen(s->ctx->psk_identity_hint);
1924                         }
1925 #endif
1926
1927                 /* not anonymous */
1928                 if (pkey != NULL)
1929                         {
1930                         /* n is the length of the params, they start at &(d[4])
1931                          * and p points to the space at the end. */
1932 #ifndef OPENSSL_NO_RSA
1933                         if (pkey->type == EVP_PKEY_RSA
1934                                         && TLS1_get_version(s) < TLS1_2_VERSION)
1935                                 {
1936                                 q=md_buf;
1937                                 j=0;
1938                                 for (num=2; num > 0; num--)
1939                                         {
1940                                         EVP_MD_CTX_set_flags(&md_ctx,
1941                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1942                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1943                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1944                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1945                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1946                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1947                                         EVP_DigestFinal_ex(&md_ctx,q,
1948                                                 (unsigned int *)&i);
1949                                         q+=i;
1950                                         j+=i;
1951                                         }
1952                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1953                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1954                                         {
1955                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1956                                         goto err;
1957                                         }
1958                                 s2n(u,p);
1959                                 n+=u+2;
1960                                 }
1961                         else
1962 #endif
1963                         if (md)
1964                                 {
1965                                 /* For TLS1.2 and later send signature
1966                                  * algorithm */
1967                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1968                                         {
1969                                         if (!tls12_get_sigandhash(p, pkey, md))
1970                                                 {
1971                                                 /* Should never happen */
1972                                                 al=SSL_AD_INTERNAL_ERROR;
1973                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1974                                                 goto f_err;
1975                                                 }
1976                                         p+=2;
1977                                         }
1978 #ifdef SSL_DEBUG
1979                                 fprintf(stderr, "Using hash %s\n",
1980                                                         EVP_MD_name(md));
1981 #endif
1982                                 EVP_SignInit_ex(&md_ctx, md, NULL);
1983                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1984                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1985                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1986                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1987                                         (unsigned int *)&i,pkey))
1988                                         {
1989                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
1990                                         goto err;
1991                                         }
1992                                 s2n(i,p);
1993                                 n+=i+2;
1994                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1995                                         n+= 2;
1996                                 }
1997                         else
1998                                 {
1999                                 /* Is this error check actually needed? */
2000                                 al=SSL_AD_HANDSHAKE_FAILURE;
2001                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2002                                 goto f_err;
2003                                 }
2004                         }
2005
2006                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
2007                 l2n3(n,d);
2008
2009                 /* we should now have things packed up, so lets send
2010                  * it off */
2011                 s->init_num=n+4;
2012                 s->init_off=0;
2013                 }
2014
2015         s->state = SSL3_ST_SW_KEY_EXCH_B;
2016         EVP_MD_CTX_cleanup(&md_ctx);
2017         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2018 f_err:
2019         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2020 err:
2021 #ifndef OPENSSL_NO_ECDH
2022         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2023         BN_CTX_free(bn_ctx);
2024 #endif
2025         EVP_MD_CTX_cleanup(&md_ctx);
2026         return(-1);
2027         }
2028
2029 int ssl3_send_certificate_request(SSL *s)
2030         {
2031         unsigned char *p,*d;
2032         int i,j,nl,off,n;
2033         STACK_OF(X509_NAME) *sk=NULL;
2034         X509_NAME *name;
2035         BUF_MEM *buf;
2036
2037         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2038                 {
2039                 buf=s->init_buf;
2040
2041                 d=p=(unsigned char *)&(buf->data[4]);
2042
2043                 /* get the list of acceptable cert types */
2044                 p++;
2045                 n=ssl3_get_req_cert_type(s,p);
2046                 d[0]=n;
2047                 p+=n;
2048                 n++;
2049
2050                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2051                         {
2052                         nl = tls12_get_req_sig_algs(s, p + 2);
2053                         s2n(nl, p);
2054                         p += nl + 2;
2055                         n += nl + 2;
2056                         }
2057
2058                 off=n;
2059                 p+=2;
2060                 n+=2;
2061
2062                 sk=SSL_get_client_CA_list(s);
2063                 nl=0;
2064                 if (sk != NULL)
2065                         {
2066                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2067                                 {
2068                                 name=sk_X509_NAME_value(sk,i);
2069                                 j=i2d_X509_NAME(name,NULL);
2070                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2071                                         {
2072                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2073                                         goto err;
2074                                         }
2075                                 p=(unsigned char *)&(buf->data[4+n]);
2076                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2077                                         {
2078                                         s2n(j,p);
2079                                         i2d_X509_NAME(name,&p);
2080                                         n+=2+j;
2081                                         nl+=2+j;
2082                                         }
2083                                 else
2084                                         {
2085                                         d=p;
2086                                         i2d_X509_NAME(name,&p);
2087                                         j-=2; s2n(j,d); j+=2;
2088                                         n+=j;
2089                                         nl+=j;
2090                                         }
2091                                 }
2092                         }
2093                 /* else no CA names */
2094                 p=(unsigned char *)&(buf->data[4+off]);
2095                 s2n(nl,p);
2096
2097                 d=(unsigned char *)buf->data;
2098                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
2099                 l2n3(n,d);
2100
2101                 /* we should now have things packed up, so lets send
2102                  * it off */
2103
2104                 s->init_num=n+4;
2105                 s->init_off=0;
2106 #ifdef NETSCAPE_HANG_BUG
2107                 if (!BUF_MEM_grow_clean(buf, s->init_num + 4))
2108                         {
2109                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2110                         goto err;
2111                         }
2112                 p=(unsigned char *)s->init_buf->data + s->init_num;
2113
2114                 /* do the header */
2115                 *(p++)=SSL3_MT_SERVER_DONE;
2116                 *(p++)=0;
2117                 *(p++)=0;
2118                 *(p++)=0;
2119                 s->init_num += 4;
2120 #endif
2121
2122                 s->state = SSL3_ST_SW_CERT_REQ_B;
2123                 }
2124
2125         /* SSL3_ST_SW_CERT_REQ_B */
2126         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2127 err:
2128         return(-1);
2129         }
2130
2131 int ssl3_get_client_key_exchange(SSL *s)
2132         {
2133         int i,al,ok;
2134         long n;
2135         unsigned long alg_k;
2136         unsigned char *p;
2137 #ifndef OPENSSL_NO_RSA
2138         RSA *rsa=NULL;
2139         EVP_PKEY *pkey=NULL;
2140 #endif
2141 #ifndef OPENSSL_NO_DH
2142         BIGNUM *pub=NULL;
2143         DH *dh_srvr;
2144 #endif
2145 #ifndef OPENSSL_NO_KRB5
2146         KSSL_ERR kssl_err;
2147 #endif /* OPENSSL_NO_KRB5 */
2148
2149 #ifndef OPENSSL_NO_ECDH
2150         EC_KEY *srvr_ecdh = NULL;
2151         EVP_PKEY *clnt_pub_pkey = NULL;
2152         EC_POINT *clnt_ecpoint = NULL;
2153         BN_CTX *bn_ctx = NULL;
2154 #endif
2155
2156         n=s->method->ssl_get_message(s,
2157                 SSL3_ST_SR_KEY_EXCH_A,
2158                 SSL3_ST_SR_KEY_EXCH_B,
2159                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2160                 2048, /* ??? */
2161                 &ok);
2162
2163         if (!ok) return((int)n);
2164         p=(unsigned char *)s->init_msg;
2165
2166         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2167
2168 #ifndef OPENSSL_NO_RSA
2169         if (alg_k & SSL_kRSA)
2170                 {
2171                 unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
2172                 int decrypt_len;
2173                 unsigned char decrypt_good, version_good;
2174
2175                 /* FIX THIS UP EAY EAY EAY EAY */
2176                 if (s->s3->tmp.use_rsa_tmp)
2177                         {
2178                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2179                                 rsa=s->cert->rsa_tmp;
2180                         /* Don't do a callback because rsa_tmp should
2181                          * be sent already */
2182                         if (rsa == NULL)
2183                                 {
2184                                 al=SSL_AD_HANDSHAKE_FAILURE;
2185                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2186                                 goto f_err;
2187
2188                                 }
2189                         }
2190                 else
2191                         {
2192                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2193                         if (    (pkey == NULL) ||
2194                                 (pkey->type != EVP_PKEY_RSA) ||
2195                                 (pkey->pkey.rsa == NULL))
2196                                 {
2197                                 al=SSL_AD_HANDSHAKE_FAILURE;
2198                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2199                                 goto f_err;
2200                                 }
2201                         rsa=pkey->pkey.rsa;
2202                         }
2203
2204                 /* TLS and [incidentally] DTLS{0xFEFF} */
2205                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2206                         {
2207                         n2s(p,i);
2208                         if (n != i+2)
2209                                 {
2210                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2211                                         {
2212                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2213                                         goto err;
2214                                         }
2215                                 else
2216                                         p-=2;
2217                                 }
2218                         else
2219                                 n=i;
2220                         }
2221
2222                 /* We must not leak whether a decryption failure occurs because
2223                  * of Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see
2224                  * RFC 2246, section 7.4.7.1). The code follows that advice of
2225                  * the TLS RFC and generates a random premaster secret for the
2226                  * case that the decrypt fails. See
2227                  * https://tools.ietf.org/html/rfc5246#section-7.4.7.1 */
2228
2229                 /* should be RAND_bytes, but we cannot work around a failure. */
2230                 if (RAND_pseudo_bytes(rand_premaster_secret,
2231                                       sizeof(rand_premaster_secret)) <= 0)
2232                         goto err;
2233                 decrypt_len = RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2234                 ERR_clear_error();
2235
2236                 /* decrypt_len should be SSL_MAX_MASTER_KEY_LENGTH.
2237                  * decrypt_good will be 0xff if so and zero otherwise. */
2238                 decrypt_good = constant_time_eq_int_8(decrypt_len, SSL_MAX_MASTER_KEY_LENGTH);
2239
2240                 /* If the version in the decrypted pre-master secret is correct
2241                  * then version_good will be 0xff, otherwise it'll be zero.
2242                  * The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2243                  * (http://eprint.iacr.org/2003/052/) exploits the version
2244                  * number check as a "bad version oracle". Thus version checks
2245                  * are done in constant time and are treated like any other
2246                  * decryption error. */
2247                 version_good = constant_time_eq_8(p[0], (unsigned)(s->client_version>>8));
2248                 version_good &= constant_time_eq_8(p[1], (unsigned)(s->client_version&0xff));
2249
2250                 /* The premaster secret must contain the same version number as
2251                  * the ClientHello to detect version rollback attacks
2252                  * (strangely, the protocol does not offer such protection for
2253                  * DH ciphersuites). However, buggy clients exist that send the
2254                  * negotiated protocol version instead if the server does not
2255                  * support the requested protocol version. If
2256                  * SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2257                 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
2258                         {
2259                         unsigned char workaround_good;
2260                         workaround_good = constant_time_eq_8(p[0], (unsigned)(s->version>>8));
2261                         workaround_good &= constant_time_eq_8(p[1], (unsigned)(s->version&0xff));
2262                         version_good |= workaround_good;
2263                         }
2264
2265                 /* Both decryption and version must be good for decrypt_good
2266                  * to remain non-zero (0xff). */
2267                 decrypt_good &= version_good;
2268
2269                 /* Now copy rand_premaster_secret over p using
2270                  * decrypt_good_mask. */
2271                 for (i = 0; i < (int) sizeof(rand_premaster_secret); i++)
2272                         {
2273                         p[i] = constant_time_select_8(decrypt_good, p[i],
2274                                                       rand_premaster_secret[i]);
2275                         }
2276
2277                 s->session->master_key_length=
2278                         s->method->ssl3_enc->generate_master_secret(s,
2279                                 s->session->master_key,
2280                                 p,i);
2281                 OPENSSL_cleanse(p,i);
2282                 }
2283         else
2284 #endif
2285 #ifndef OPENSSL_NO_DH
2286                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2287                 {
2288                 n2s(p,i);
2289                 if (n != i+2)
2290                         {
2291                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2292                                 {
2293                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2294                                 goto err;
2295                                 }
2296                         else
2297                                 {
2298                                 p-=2;
2299                                 i=(int)n;
2300                                 }
2301                         }
2302
2303                 if (n == 0L) /* the parameters are in the cert */
2304                         {
2305                         al=SSL_AD_HANDSHAKE_FAILURE;
2306                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
2307                         goto f_err;
2308                         }
2309                 else
2310                         {
2311                         if (s->s3->tmp.dh == NULL)
2312                                 {
2313                                 al=SSL_AD_HANDSHAKE_FAILURE;
2314                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2315                                 goto f_err;
2316                                 }
2317                         else
2318                                 dh_srvr=s->s3->tmp.dh;
2319                         }
2320
2321                 pub=BN_bin2bn(p,i,NULL);
2322                 if (pub == NULL)
2323                         {
2324                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2325                         goto err;
2326                         }
2327
2328                 i=DH_compute_key(p,pub,dh_srvr);
2329
2330                 if (i <= 0)
2331                         {
2332                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2333                         BN_clear_free(pub);
2334                         goto err;
2335                         }
2336
2337                 DH_free(s->s3->tmp.dh);
2338                 s->s3->tmp.dh=NULL;
2339
2340                 BN_clear_free(pub);
2341                 pub=NULL;
2342                 s->session->master_key_length=
2343                         s->method->ssl3_enc->generate_master_secret(s,
2344                                 s->session->master_key,p,i);
2345                 OPENSSL_cleanse(p,i);
2346                 }
2347         else
2348 #endif
2349 #ifndef OPENSSL_NO_KRB5
2350         if (alg_k & SSL_kKRB5)
2351                 {
2352                 krb5_error_code         krb5rc;
2353                 krb5_data               enc_ticket;
2354                 krb5_data               authenticator;
2355                 krb5_data               enc_pms;
2356                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2357                 EVP_CIPHER_CTX          ciph_ctx;
2358                 const EVP_CIPHER        *enc = NULL;
2359                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2360                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2361                                                + EVP_MAX_BLOCK_LENGTH];
2362                 int                  padl, outl;
2363                 krb5_timestamp          authtime = 0;
2364                 krb5_ticket_times       ttimes;
2365
2366                 EVP_CIPHER_CTX_init(&ciph_ctx);
2367
2368                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2369
2370                 n2s(p,i);
2371                 enc_ticket.length = i;
2372
2373                 if (n < (long)(enc_ticket.length + 6))
2374                         {
2375                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2376                                 SSL_R_DATA_LENGTH_TOO_LONG);
2377                         goto err;
2378                         }
2379
2380                 enc_ticket.data = (char *)p;
2381                 p+=enc_ticket.length;
2382
2383                 n2s(p,i);
2384                 authenticator.length = i;
2385
2386                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2387                         {
2388                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2389                                 SSL_R_DATA_LENGTH_TOO_LONG);
2390                         goto err;
2391                         }
2392
2393                 authenticator.data = (char *)p;
2394                 p+=authenticator.length;
2395
2396                 n2s(p,i);
2397                 enc_pms.length = i;
2398                 enc_pms.data = (char *)p;
2399                 p+=enc_pms.length;
2400
2401                 /* Note that the length is checked again below,
2402                 ** after decryption
2403                 */
2404                 if(enc_pms.length > sizeof pms)
2405                         {
2406                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2407                                SSL_R_DATA_LENGTH_TOO_LONG);
2408                         goto err;
2409                         }
2410
2411                 if (n != (long)(enc_ticket.length + authenticator.length +
2412                                                 enc_pms.length + 6))
2413                         {
2414                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2415                                 SSL_R_DATA_LENGTH_TOO_LONG);
2416                         goto err;
2417                         }
2418
2419                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2420                                         &kssl_err)) != 0)
2421                         {
2422 #ifdef KSSL_DEBUG
2423                         printf("kssl_sget_tkt rtn %d [%d]\n",
2424                                 krb5rc, kssl_err.reason);
2425                         if (kssl_err.text)
2426                                 printf("kssl_err text= %s\n", kssl_err.text);
2427 #endif  /* KSSL_DEBUG */
2428                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2429                                 kssl_err.reason);
2430                         goto err;
2431                         }
2432
2433                 /*  Note: no authenticator is not considered an error,
2434                 **  but will return authtime == 0.
2435                 */
2436                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2437                                         &authtime, &kssl_err)) != 0)
2438                         {
2439 #ifdef KSSL_DEBUG
2440                         printf("kssl_check_authent rtn %d [%d]\n",
2441                                 krb5rc, kssl_err.reason);
2442                         if (kssl_err.text)
2443                                 printf("kssl_err text= %s\n", kssl_err.text);
2444 #endif  /* KSSL_DEBUG */
2445                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2446                                 kssl_err.reason);
2447                         goto err;
2448                         }
2449
2450                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2451                         {
2452                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2453                         goto err;
2454                         }
2455
2456 #ifdef KSSL_DEBUG
2457                 kssl_ctx_show(kssl_ctx);
2458 #endif  /* KSSL_DEBUG */
2459
2460                 enc = kssl_map_enc(kssl_ctx->enctype);
2461                 if (enc == NULL)
2462                     goto err;
2463
2464                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2465
2466                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2467                         {
2468                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2469                                 SSL_R_DECRYPTION_FAILED);
2470                         goto err;
2471                         }
2472                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2473                                         (unsigned char *)enc_pms.data, enc_pms.length))
2474                         {
2475                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2476                                 SSL_R_DECRYPTION_FAILED);
2477                         goto err;
2478                         }
2479                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2480                         {
2481                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2482                                 SSL_R_DATA_LENGTH_TOO_LONG);
2483                         goto err;
2484                         }
2485                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2486                         {
2487                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2488                                 SSL_R_DECRYPTION_FAILED);
2489                         goto err;
2490                         }
2491                 outl += padl;
2492                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2493                         {
2494                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2495                                 SSL_R_DATA_LENGTH_TOO_LONG);
2496                         goto err;
2497                         }
2498                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2499                     {
2500                     /* The premaster secret must contain the same version number as the
2501                      * ClientHello to detect version rollback attacks (strangely, the
2502                      * protocol does not offer such protection for DH ciphersuites).
2503                      * However, buggy clients exist that send random bytes instead of
2504                      * the protocol version.
2505                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2506                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2507                      */
2508                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2509                         {
2510                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2511                                SSL_AD_DECODE_ERROR);
2512                         goto err;
2513                         }
2514                     }
2515
2516                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2517
2518                 s->session->master_key_length=
2519                         s->method->ssl3_enc->generate_master_secret(s,
2520                                 s->session->master_key, pms, outl);
2521
2522                 if (kssl_ctx->client_princ)
2523                         {
2524                         size_t len = strlen(kssl_ctx->client_princ);
2525                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2526                                 {
2527                                 s->session->krb5_client_princ_len = len;
2528                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2529                                 }
2530                         }
2531
2532
2533                 /*  Was doing kssl_ctx_free() here,
2534                 **  but it caused problems for apache.
2535                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2536                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2537                 */
2538                 }
2539         else
2540 #endif  /* OPENSSL_NO_KRB5 */
2541
2542 #ifndef OPENSSL_NO_ECDH
2543                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2544                 {
2545                 int ret = 1;
2546                 int field_size = 0;
2547                 const EC_KEY   *tkey;
2548                 const EC_GROUP *group;
2549                 const BIGNUM *priv_key;
2550
2551                 /* initialize structures for server's ECDH key pair */
2552                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2553                         {
2554                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2555                             ERR_R_MALLOC_FAILURE);
2556                         goto err;
2557                         }
2558
2559                 /* Let's get server private key and group information */
2560                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2561                         {
2562                         /* use the certificate */
2563                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2564                         }
2565                 else
2566                         {
2567                         /* use the ephermeral values we saved when
2568                          * generating the ServerKeyExchange msg.
2569                          */
2570                         tkey = s->s3->tmp.ecdh;
2571                         }
2572
2573                 group    = EC_KEY_get0_group(tkey);
2574                 priv_key = EC_KEY_get0_private_key(tkey);
2575
2576                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2577                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2578                         {
2579                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2580                                ERR_R_EC_LIB);
2581                         goto err;
2582                         }
2583
2584                 /* Let's get client's public key */
2585                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2586                         {
2587                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2588                             ERR_R_MALLOC_FAILURE);
2589                         goto err;
2590                         }
2591
2592                 if (n == 0L)
2593                         {
2594                         /* Client Publickey was in Client Certificate */
2595
2596                          if (alg_k & SSL_kEECDH)
2597                                  {
2598                                  al=SSL_AD_HANDSHAKE_FAILURE;
2599                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2600                                  goto f_err;
2601                                  }
2602                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2603                             == NULL) ||
2604                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2605                                 {
2606                                 /* XXX: For now, we do not support client
2607                                  * authentication using ECDH certificates
2608                                  * so this branch (n == 0L) of the code is
2609                                  * never executed. When that support is
2610                                  * added, we ought to ensure the key
2611                                  * received in the certificate is
2612                                  * authorized for key agreement.
2613                                  * ECDH_compute_key implicitly checks that
2614                                  * the two ECDH shares are for the same
2615                                  * group.
2616                                  */
2617                                 al=SSL_AD_HANDSHAKE_FAILURE;
2618                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2619                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2620                                 goto f_err;
2621                                 }
2622
2623                         if (EC_POINT_copy(clnt_ecpoint,
2624                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2625                                 {
2626                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2627                                         ERR_R_EC_LIB);
2628                                 goto err;
2629                                 }
2630                         ret = 2; /* Skip certificate verify processing */
2631                         }
2632                 else
2633                         {
2634                         /* Get client's public key from encoded point
2635                          * in the ClientKeyExchange message.
2636                          */
2637                         if ((bn_ctx = BN_CTX_new()) == NULL)
2638                                 {
2639                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2640                                     ERR_R_MALLOC_FAILURE);
2641                                 goto err;
2642                                 }
2643
2644                         /* Get encoded point length */
2645                         i = *p;
2646                         p += 1;
2647                         if (n != 1 + i)
2648                                 {
2649                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2650                                     ERR_R_EC_LIB);
2651                                 goto err;
2652                                 }
2653                         if (EC_POINT_oct2point(group,
2654                             clnt_ecpoint, p, i, bn_ctx) == 0)
2655                                 {
2656                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2657                                     ERR_R_EC_LIB);
2658                                 goto err;
2659                                 }
2660                         /* p is pointing to somewhere in the buffer
2661                          * currently, so set it to the start
2662                          */
2663                         p=(unsigned char *)s->init_buf->data;
2664                         }
2665
2666                 /* Compute the shared pre-master secret */
2667                 field_size = EC_GROUP_get_degree(group);
2668                 if (field_size <= 0)
2669                         {
2670                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2671                                ERR_R_ECDH_LIB);
2672                         goto err;
2673                         }
2674                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2675                 if (i <= 0)
2676                         {
2677                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2678                             ERR_R_ECDH_LIB);
2679                         goto err;
2680                         }
2681
2682                 EVP_PKEY_free(clnt_pub_pkey);
2683                 EC_POINT_free(clnt_ecpoint);
2684                 EC_KEY_free(srvr_ecdh);
2685                 BN_CTX_free(bn_ctx);
2686                 EC_KEY_free(s->s3->tmp.ecdh);
2687                 s->s3->tmp.ecdh = NULL;
2688
2689                 /* Compute the master secret */
2690                 s->session->master_key_length = s->method->ssl3_enc-> \
2691                     generate_master_secret(s, s->session->master_key, p, i);
2692
2693                 OPENSSL_cleanse(p, i);
2694                 return (ret);
2695                 }
2696         else
2697 #endif
2698 #ifndef OPENSSL_NO_PSK
2699                 if (alg_k & SSL_kPSK)
2700                         {
2701                         unsigned char *t = NULL;
2702                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2703                         unsigned int pre_ms_len = 0, psk_len = 0;
2704                         int psk_err = 1;
2705                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2706
2707                         al=SSL_AD_HANDSHAKE_FAILURE;
2708
2709                         n2s(p,i);
2710                         if (n != i+2)
2711                                 {
2712                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2713                                         SSL_R_LENGTH_MISMATCH);
2714                                 goto psk_err;
2715                                 }
2716                         if (i > PSK_MAX_IDENTITY_LEN)
2717                                 {
2718                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2719                                         SSL_R_DATA_LENGTH_TOO_LONG);
2720                                 goto psk_err;
2721                                 }
2722                         if (s->psk_server_callback == NULL)
2723                                 {
2724                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2725                                        SSL_R_PSK_NO_SERVER_CB);
2726                                 goto psk_err;
2727                                 }
2728
2729                         /* Create guaranteed NULL-terminated identity
2730                          * string for the callback */
2731                         memcpy(tmp_id, p, i);
2732                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2733                         psk_len = s->psk_server_callback(s, tmp_id,
2734                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2735                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2736
2737                         if (psk_len > PSK_MAX_PSK_LEN)
2738                                 {
2739                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2740                                         ERR_R_INTERNAL_ERROR);
2741                                 goto psk_err;
2742                                 }
2743                         else if (psk_len == 0)
2744                                 {
2745                                 /* PSK related to the given identity not found */
2746                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2747                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2748                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2749                                 goto psk_err;
2750                                 }
2751
2752                         /* create PSK pre_master_secret */
2753                         pre_ms_len=2+psk_len+2+psk_len;
2754                         t = psk_or_pre_ms;
2755                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2756                         s2n(psk_len, t);
2757                         memset(t, 0, psk_len);
2758                         t+=psk_len;
2759                         s2n(psk_len, t);
2760
2761                         if (s->session->psk_identity != NULL)
2762                                 OPENSSL_free(s->session->psk_identity);
2763                         s->session->psk_identity = BUF_strdup((char *)p);
2764                         if (s->session->psk_identity == NULL)
2765                                 {
2766                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2767                                         ERR_R_MALLOC_FAILURE);
2768                                 goto psk_err;
2769                                 }
2770
2771                         if (s->session->psk_identity_hint != NULL)
2772                                 OPENSSL_free(s->session->psk_identity_hint);
2773                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2774                         if (s->ctx->psk_identity_hint != NULL &&
2775                                 s->session->psk_identity_hint == NULL)
2776                                 {
2777                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2778                                         ERR_R_MALLOC_FAILURE);
2779                                 goto psk_err;
2780                                 }
2781
2782                         s->session->master_key_length=
2783                                 s->method->ssl3_enc->generate_master_secret(s,
2784                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2785                         psk_err = 0;
2786                 psk_err:
2787                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2788                         if (psk_err != 0)
2789                                 goto f_err;
2790                         }
2791                 else
2792 #endif
2793 #ifndef OPENSSL_NO_SRP
2794                 if (alg_k & SSL_kSRP)
2795                         {
2796                         int param_len;
2797
2798                         n2s(p,i);
2799                         param_len=i+2;
2800                         if (param_len > n)
2801                                 {
2802                                 al=SSL_AD_DECODE_ERROR;
2803                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2804                                 goto f_err;
2805                                 }
2806                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2807                                 {
2808                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2809                                 goto err;
2810                                 }
2811                         if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0
2812                                 || BN_is_zero(s->srp_ctx.A))
2813                                 {
2814                                 al=SSL_AD_ILLEGAL_PARAMETER;
2815                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
2816                                 goto f_err;
2817                                 }
2818                         if (s->session->srp_username != NULL)
2819                                 OPENSSL_free(s->session->srp_username);
2820                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2821                         if (s->session->srp_username == NULL)
2822                                 {
2823                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2824                                         ERR_R_MALLOC_FAILURE);
2825                                 goto err;
2826                                 }
2827
2828                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2829                                 {
2830                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2831                                 goto err;
2832                                 }
2833
2834                         p+=i;
2835                         }
2836                 else
2837 #endif  /* OPENSSL_NO_SRP */
2838                 if (alg_k & SSL_kGOST)
2839                         {
2840                         int ret = 0;
2841                         EVP_PKEY_CTX *pkey_ctx;
2842                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2843                         unsigned char premaster_secret[32], *start;
2844                         size_t outlen=32, inlen;
2845                         unsigned long alg_a;
2846                         int Ttag, Tclass;
2847                         long Tlen;
2848
2849                         /* Get our certificate private key*/
2850                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2851                         if (alg_a & SSL_aGOST94)
2852                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2853                         else if (alg_a & SSL_aGOST01)
2854                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2855
2856                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2857                         EVP_PKEY_decrypt_init(pkey_ctx);
2858                         /* If client certificate is present and is of the same type, maybe
2859                          * use it for key exchange.  Don't mind errors from
2860                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2861                          * a client certificate for authorization only. */
2862                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2863                         if (client_pub_pkey)
2864                                 {
2865                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2866                                         ERR_clear_error();
2867                                 }
2868                         /* Decrypt session key */
2869                         if (ASN1_get_object((const unsigned char **)&p, &Tlen, &Ttag, &Tclass, n) != V_ASN1_CONSTRUCTED ||
2870                                 Ttag != V_ASN1_SEQUENCE ||
2871                                 Tclass != V_ASN1_UNIVERSAL)
2872                                 {
2873                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2874                                 goto gerr;
2875                                 }
2876                         start = p;
2877                         inlen = Tlen;
2878                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
2879
2880                                 {
2881                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2882                                 goto gerr;
2883                                 }
2884                         /* Generate master secret */
2885                         s->session->master_key_length=
2886                                 s->method->ssl3_enc->generate_master_secret(s,
2887                                         s->session->master_key,premaster_secret,32);
2888                         /* Check if pubkey from client certificate was used */
2889                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2890                                 ret = 2;
2891                         else
2892                                 ret = 1;
2893                 gerr:
2894                         EVP_PKEY_free(client_pub_pkey);
2895                         EVP_PKEY_CTX_free(pkey_ctx);
2896                         if (ret)
2897                                 return ret;
2898                         else
2899                                 goto err;
2900                         }
2901                 else
2902                 {
2903                 al=SSL_AD_HANDSHAKE_FAILURE;
2904                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2905                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2906                 goto f_err;
2907                 }
2908
2909         return(1);
2910 f_err:
2911         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2912 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
2913 err:
2914 #endif
2915 #ifndef OPENSSL_NO_ECDH
2916         EVP_PKEY_free(clnt_pub_pkey);
2917         EC_POINT_free(clnt_ecpoint);
2918         if (srvr_ecdh != NULL)
2919                 EC_KEY_free(srvr_ecdh);
2920         BN_CTX_free(bn_ctx);
2921 #endif
2922         return(-1);
2923         }
2924
2925 int ssl3_get_cert_verify(SSL *s)
2926         {
2927         EVP_PKEY *pkey=NULL;
2928         unsigned char *p;
2929         int al,ok,ret=0;
2930         long n;
2931         int type=0,i,j;
2932         X509 *peer;
2933         const EVP_MD *md = NULL;
2934         EVP_MD_CTX mctx;
2935         EVP_MD_CTX_init(&mctx);
2936
2937         n=s->method->ssl_get_message(s,
2938                 SSL3_ST_SR_CERT_VRFY_A,
2939                 SSL3_ST_SR_CERT_VRFY_B,
2940                 -1,
2941                 SSL3_RT_MAX_PLAIN_LENGTH,
2942                 &ok);
2943
2944         if (!ok) return((int)n);
2945
2946         if (s->session->peer != NULL)
2947                 {
2948                 peer=s->session->peer;
2949                 pkey=X509_get_pubkey(peer);
2950                 type=X509_certificate_type(peer,pkey);
2951                 }
2952         else
2953                 {
2954                 peer=NULL;
2955                 pkey=NULL;
2956                 }
2957
2958         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2959                 {
2960                 s->s3->tmp.reuse_message=1;
2961                 if ((peer != NULL) && (type & EVP_PKT_SIGN))
2962                         {
2963                         al=SSL_AD_UNEXPECTED_MESSAGE;
2964                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2965                         goto f_err;
2966                         }
2967                 ret=1;
2968                 goto end;
2969                 }
2970
2971         if (peer == NULL)
2972                 {
2973                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2974                 al=SSL_AD_UNEXPECTED_MESSAGE;
2975                 goto f_err;
2976                 }
2977
2978         if (!(type & EVP_PKT_SIGN))
2979                 {
2980                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2981                 al=SSL_AD_ILLEGAL_PARAMETER;
2982                 goto f_err;
2983                 }
2984
2985         if (s->s3->change_cipher_spec)
2986                 {
2987                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2988                 al=SSL_AD_UNEXPECTED_MESSAGE;
2989                 goto f_err;
2990                 }
2991
2992         /* we now have a signature that we need to verify */
2993         p=(unsigned char *)s->init_msg;
2994         /* Check for broken implementations of GOST ciphersuites */
2995         /* If key is GOST and n is exactly 64, it is bare
2996          * signature without length field */
2997         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
2998                 pkey->type == NID_id_GostR3410_2001) )
2999                 {
3000                 i=64;
3001                 }
3002         else
3003                 {
3004                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
3005                         {
3006                         int sigalg = tls12_get_sigid(pkey);
3007                         /* Should never happen */
3008                         if (sigalg == -1)
3009                                 {
3010                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3011                                 al=SSL_AD_INTERNAL_ERROR;
3012                                 goto f_err;
3013                                 }
3014                         /* Check key type is consistent with signature */
3015                         if (sigalg != (int)p[1])
3016                                 {
3017                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_TYPE);
3018                                 al=SSL_AD_DECODE_ERROR;
3019                                 goto f_err;
3020                                 }
3021                         md = tls12_get_hash(p[0]);
3022                         if (md == NULL)
3023                                 {
3024                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_UNKNOWN_DIGEST);
3025                                 al=SSL_AD_DECODE_ERROR;
3026                                 goto f_err;
3027                                 }
3028 #ifdef SSL_DEBUG
3029 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3030 #endif
3031                         p += 2;
3032                         n -= 2;
3033                         }
3034                 n2s(p,i);
3035                 n-=2;
3036                 if (i > n)
3037                         {
3038                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3039                         al=SSL_AD_DECODE_ERROR;
3040                         goto f_err;
3041                         }
3042         }
3043         j=EVP_PKEY_size(pkey);
3044         if ((i > j) || (n > j) || (n <= 0))
3045                 {
3046                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3047                 al=SSL_AD_DECODE_ERROR;
3048                 goto f_err;
3049                 }
3050
3051         if (TLS1_get_version(s) >= TLS1_2_VERSION)
3052                 {
3053                 long hdatalen = 0;
3054                 void *hdata;
3055                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3056                 if (hdatalen <= 0)
3057                         {
3058                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3059                         al=SSL_AD_INTERNAL_ERROR;
3060                         goto f_err;
3061                         }
3062 #ifdef SSL_DEBUG
3063                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3064                                                         EVP_MD_name(md));
3065 #endif
3066                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3067                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3068                         {
3069                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3070                         al=SSL_AD_INTERNAL_ERROR;
3071                         goto f_err;
3072                         }
3073
3074                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3075                         {
3076                         al=SSL_AD_DECRYPT_ERROR;
3077                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3078                         goto f_err;
3079                         }
3080                 }
3081         else
3082 #ifndef OPENSSL_NO_RSA
3083         if (pkey->type == EVP_PKEY_RSA)
3084                 {
3085                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3086                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
3087                                                         pkey->pkey.rsa);
3088                 if (i < 0)
3089                         {
3090                         al=SSL_AD_DECRYPT_ERROR;
3091                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3092                         goto f_err;
3093                         }
3094                 if (i == 0)
3095                         {
3096                         al=SSL_AD_DECRYPT_ERROR;
3097                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3098                         goto f_err;
3099                         }
3100                 }
3101         else
3102 #endif
3103 #ifndef OPENSSL_NO_DSA
3104                 if (pkey->type == EVP_PKEY_DSA)
3105                 {
3106                 j=DSA_verify(pkey->save_type,
3107                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3108                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3109                 if (j <= 0)
3110                         {
3111                         /* bad signature */
3112                         al=SSL_AD_DECRYPT_ERROR;
3113                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3114                         goto f_err;
3115                         }
3116                 }
3117         else
3118 #endif
3119 #ifndef OPENSSL_NO_ECDSA
3120                 if (pkey->type == EVP_PKEY_EC)
3121                 {
3122                 j=ECDSA_verify(pkey->save_type,
3123                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3124                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3125                 if (j <= 0)
3126                         {
3127                         /* bad signature */
3128                         al=SSL_AD_DECRYPT_ERROR;
3129                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3130                             SSL_R_BAD_ECDSA_SIGNATURE);
3131                         goto f_err;
3132                         }
3133                 }
3134         else
3135 #endif
3136         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3137                 {   unsigned char signature[64];
3138                         int idx;
3139                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3140                         EVP_PKEY_verify_init(pctx);
3141                         if (i!=64) {
3142                                 fprintf(stderr,"GOST signature length is %d",i);
3143                         }
3144                         for (idx=0;idx<64;idx++) {
3145                                 signature[63-idx]=p[idx];
3146                         }
3147                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3148                         EVP_PKEY_CTX_free(pctx);
3149                         if (j<=0)
3150                                 {
3151                                 al=SSL_AD_DECRYPT_ERROR;
3152                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3153                                         SSL_R_BAD_ECDSA_SIGNATURE);
3154                                 goto f_err;
3155                                 }
3156                 }
3157         else
3158                 {
3159                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3160                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3161                 goto f_err;
3162                 }
3163
3164
3165         ret=1;
3166         if (0)
3167                 {
3168 f_err:
3169                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3170                 }
3171 end:
3172         if (s->s3->handshake_buffer)
3173                 {
3174                 BIO_free(s->s3->handshake_buffer);
3175                 s->s3->handshake_buffer = NULL;
3176                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3177                 }
3178         EVP_MD_CTX_cleanup(&mctx);
3179         EVP_PKEY_free(pkey);
3180         return(ret);
3181         }
3182
3183 int ssl3_get_client_certificate(SSL *s)
3184         {
3185         int i,ok,al,ret= -1;
3186         X509 *x=NULL;
3187         unsigned long l,nc,llen,n;
3188         const unsigned char *p,*q;
3189         unsigned char *d;
3190         STACK_OF(X509) *sk=NULL;
3191
3192         n=s->method->ssl_get_message(s,
3193                 SSL3_ST_SR_CERT_A,
3194                 SSL3_ST_SR_CERT_B,
3195                 -1,
3196                 s->max_cert_list,
3197                 &ok);
3198
3199         if (!ok) return((int)n);
3200
3201         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3202                 {
3203                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3204                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3205                         {
3206                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3207                         al=SSL_AD_HANDSHAKE_FAILURE;
3208                         goto f_err;
3209                         }
3210                 /* If tls asked for a client cert, the client must return a 0 list */
3211                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3212                         {
3213                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3214                         al=SSL_AD_UNEXPECTED_MESSAGE;
3215                         goto f_err;
3216                         }
3217                 s->s3->tmp.reuse_message=1;
3218                 return(1);
3219                 }
3220
3221         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3222                 {
3223                 al=SSL_AD_UNEXPECTED_MESSAGE;
3224                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3225                 goto f_err;
3226                 }
3227         p=d=(unsigned char *)s->init_msg;
3228
3229         if ((sk=sk_X509_new_null()) == NULL)
3230                 {
3231                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3232                 goto err;
3233                 }
3234
3235         n2l3(p,llen);
3236         if (llen+3 != n)
3237                 {
3238                 al=SSL_AD_DECODE_ERROR;
3239                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3240                 goto f_err;
3241                 }
3242         for (nc=0; nc<llen; )
3243                 {
3244                 n2l3(p,l);
3245                 if ((l+nc+3) > llen)
3246                         {
3247                         al=SSL_AD_DECODE_ERROR;
3248                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3249                         goto f_err;
3250                         }
3251
3252                 q=p;
3253                 x=d2i_X509(NULL,&p,l);
3254                 if (x == NULL)
3255                         {
3256                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3257                         goto err;
3258                         }
3259                 if (p != (q+l))
3260                         {
3261                         al=SSL_AD_DECODE_ERROR;
3262                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3263                         goto f_err;
3264                         }
3265                 if (!sk_X509_push(sk,x))
3266                         {
3267                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3268                         goto err;
3269                         }
3270                 x=NULL;
3271                 nc+=l+3;
3272                 }
3273
3274         if (sk_X509_num(sk) <= 0)
3275                 {
3276                 /* TLS does not mind 0 certs returned */
3277                 if (s->version == SSL3_VERSION)
3278                         {
3279                         al=SSL_AD_HANDSHAKE_FAILURE;
3280                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3281                         goto f_err;
3282                         }
3283                 /* Fail for TLS only if we required a certificate */
3284                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3285                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3286                         {
3287                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3288                         al=SSL_AD_HANDSHAKE_FAILURE;
3289                         goto f_err;
3290                         }
3291                 /* No client certificate so digest cached records */
3292                 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s))
3293                         {
3294                         al=SSL_AD_INTERNAL_ERROR;
3295                         goto f_err;
3296                         }
3297                 }
3298         else
3299                 {
3300                 i=ssl_verify_cert_chain(s,sk);
3301                 if (i <= 0)
3302                         {
3303                         al=ssl_verify_alarm_type(s->verify_result);
3304                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
3305                         goto f_err;
3306                         }
3307                 }
3308
3309         if (s->session->peer != NULL) /* This should not be needed */
3310                 X509_free(s->session->peer);
3311         s->session->peer=sk_X509_shift(sk);
3312         s->session->verify_result = s->verify_result;
3313
3314         /* With the current implementation, sess_cert will always be NULL
3315          * when we arrive here. */
3316         if (s->session->sess_cert == NULL)
3317                 {
3318                 s->session->sess_cert = ssl_sess_cert_new();
3319                 if (s->session->sess_cert == NULL)
3320                         {
3321                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3322                         goto err;
3323                         }
3324                 }
3325         if (s->session->sess_cert->cert_chain != NULL)
3326                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3327         s->session->sess_cert->cert_chain=sk;
3328         /* Inconsistency alert: cert_chain does *not* include the
3329          * peer's own certificate, while we do include it in s3_clnt.c */
3330
3331         sk=NULL;
3332
3333         ret=1;
3334         if (0)
3335                 {
3336 f_err:
3337                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3338                 }
3339 err:
3340         if (x != NULL) X509_free(x);
3341         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3342         return(ret);
3343         }
3344
3345 int ssl3_send_server_certificate(SSL *s)
3346         {
3347         unsigned long l;
3348         X509 *x;
3349
3350         if (s->state == SSL3_ST_SW_CERT_A)
3351                 {
3352                 x=ssl_get_server_send_cert(s);
3353                 if (x == NULL)
3354                         {
3355                         /* VRS: allow null cert if auth == KRB5 */
3356                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3357                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3358                                 {
3359                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3360                                 return(0);
3361                                 }
3362                         }
3363
3364                 l=ssl3_output_cert_chain(s,x);
3365                 s->state=SSL3_ST_SW_CERT_B;
3366                 s->init_num=(int)l;
3367                 s->init_off=0;
3368                 }
3369
3370         /* SSL3_ST_SW_CERT_B */
3371         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3372         }
3373
3374 #ifndef OPENSSL_NO_TLSEXT
3375 /* send a new session ticket (not necessarily for a new session) */
3376 int ssl3_send_newsession_ticket(SSL *s)
3377         {
3378         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3379                 {
3380                 unsigned char *p, *senc, *macstart;
3381                 const unsigned char *const_p;
3382                 int len, slen_full, slen;
3383                 SSL_SESSION *sess;
3384                 unsigned int hlen;
3385                 EVP_CIPHER_CTX ctx;
3386                 HMAC_CTX hctx;
3387                 SSL_CTX *tctx = s->initial_ctx;
3388                 unsigned char iv[EVP_MAX_IV_LENGTH];
3389                 unsigned char key_name[16];
3390
3391                 /* get session encoding length */
3392                 slen_full = i2d_SSL_SESSION(s->session, NULL);
3393                 /* Some length values are 16 bits, so forget it if session is
3394                  * too long
3395                  */
3396                 if (slen_full > 0xFF00)
3397                         return -1;
3398                 senc = OPENSSL_malloc(slen_full);
3399                 if (!senc)
3400                         return -1;
3401                 p = senc;
3402                 i2d_SSL_SESSION(s->session, &p);
3403
3404                 /* create a fresh copy (not shared with other threads) to clean up */
3405                 const_p = senc;
3406                 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3407                 if (sess == NULL)
3408                         {
3409                         OPENSSL_free(senc);
3410                         return -1;
3411                         }
3412                 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
3413
3414                 slen = i2d_SSL_SESSION(sess, NULL);
3415                 if (slen > slen_full) /* shouldn't ever happen */
3416                         {
3417                         OPENSSL_free(senc);
3418                         return -1;
3419                         }
3420                 p = senc;
3421                 i2d_SSL_SESSION(sess, &p);
3422                 SSL_SESSION_free(sess);
3423
3424                 /* Grow buffer if need be: the length calculation is as
3425                  * follows 1 (size of message name) + 3 (message length
3426                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
3427                  * 16 (key name) + max_iv_len (iv length) +
3428                  * session_length + max_enc_block_size (max encrypted session
3429                  * length) + max_md_size (HMAC).
3430                  */
3431                 if (!BUF_MEM_grow(s->init_buf,
3432                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
3433                         EVP_MAX_MD_SIZE + slen))
3434                         return -1;
3435
3436                 p=(unsigned char *)s->init_buf->data;
3437                 /* do the header */
3438                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
3439                 /* Skip message length for now */
3440                 p += 3;
3441                 EVP_CIPHER_CTX_init(&ctx);
3442                 HMAC_CTX_init(&hctx);
3443                 /* Initialize HMAC and cipher contexts. If callback present
3444                  * it does all the work otherwise use generated values
3445                  * from parent ctx.
3446                  */
3447                 if (tctx->tlsext_ticket_key_cb)
3448                         {
3449                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3450                                                          &hctx, 1) < 0)
3451                                 {
3452                                 OPENSSL_free(senc);
3453                                 return -1;
3454                                 }
3455                         }
3456                 else
3457                         {
3458                         RAND_pseudo_bytes(iv, 16);
3459                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3460                                         tctx->tlsext_tick_aes_key, iv);
3461                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3462                                         tlsext_tick_md(), NULL);
3463                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3464                         }
3465
3466                 /* Ticket lifetime hint (advisory only):
3467                  * We leave this unspecified for resumed session (for simplicity),
3468                  * and guess that tickets for new sessions will live as long
3469                  * as their sessions. */
3470                 l2n(s->hit ? 0 : s->session->timeout, p);
3471
3472                 /* Skip ticket length for now */
3473                 p += 2;
3474                 /* Output key name */
3475                 macstart = p;
3476                 memcpy(p, key_name, 16);
3477                 p += 16;
3478                 /* output IV */
3479                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3480                 p += EVP_CIPHER_CTX_iv_length(&ctx);
3481                 /* Encrypt session data */
3482                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3483                 p += len;
3484                 EVP_EncryptFinal(&ctx, p, &len);
3485                 p += len;
3486                 EVP_CIPHER_CTX_cleanup(&ctx);
3487
3488                 HMAC_Update(&hctx, macstart, p - macstart);
3489                 HMAC_Final(&hctx, p, &hlen);
3490                 HMAC_CTX_cleanup(&hctx);
3491
3492                 p += hlen;
3493                 /* Now write out lengths: p points to end of data written */
3494                 /* Total length */
3495                 len = p - (unsigned char *)s->init_buf->data;
3496                 p=(unsigned char *)s->init_buf->data + 1;
3497                 l2n3(len - 4, p); /* Message length */
3498                 p += 4;
3499                 s2n(len - 10, p);  /* Ticket length */
3500
3501                 /* number of bytes to write */
3502                 s->init_num= len;
3503                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3504                 s->init_off=0;
3505                 OPENSSL_free(senc);
3506                 }
3507
3508         /* SSL3_ST_SW_SESSION_TICKET_B */
3509         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3510         }
3511
3512 int ssl3_send_cert_status(SSL *s)
3513         {
3514         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3515                 {
3516                 unsigned char *p;
3517                 /* Grow buffer if need be: the length calculation is as
3518                  * follows 1 (message type) + 3 (message length) +
3519                  * 1 (ocsp response type) + 3 (ocsp response length)
3520                  * + (ocsp response)
3521                  */
3522                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3523                         return -1;
3524
3525                 p=(unsigned char *)s->init_buf->data;
3526
3527                 /* do the header */
3528                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3529                 /* message length */
3530                 l2n3(s->tlsext_ocsp_resplen + 4, p);
3531                 /* status type */
3532                 *(p++)= s->tlsext_status_type;
3533                 /* length of OCSP response */
3534                 l2n3(s->tlsext_ocsp_resplen, p);
3535                 /* actual response */
3536                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3537                 /* number of bytes to write */
3538                 s->init_num = 8 + s->tlsext_ocsp_resplen;
3539                 s->state=SSL3_ST_SW_CERT_STATUS_B;
3540                 s->init_off = 0;
3541                 }
3542
3543         /* SSL3_ST_SW_CERT_STATUS_B */
3544         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3545         }
3546
3547 # ifndef OPENSSL_NO_NEXTPROTONEG
3548 /* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It
3549  * sets the next_proto member in s if found */
3550 int ssl3_get_next_proto(SSL *s)
3551         {
3552         int ok;
3553         int proto_len, padding_len;
3554         long n;
3555         const unsigned char *p;
3556
3557         /* Clients cannot send a NextProtocol message if we didn't see the
3558          * extension in their ClientHello */
3559         if (!s->s3->next_proto_neg_seen)
3560                 {
3561                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION);
3562                 return -1;
3563                 }
3564
3565         n=s->method->ssl_get_message(s,
3566                 SSL3_ST_SR_NEXT_PROTO_A,
3567                 SSL3_ST_SR_NEXT_PROTO_B,
3568                 SSL3_MT_NEXT_PROTO,
3569                 514,  /* See the payload format below */
3570                 &ok);
3571
3572         if (!ok)
3573                 return((int)n);
3574
3575         /* s->state doesn't reflect whether ChangeCipherSpec has been received
3576          * in this handshake, but s->s3->change_cipher_spec does (will be reset
3577          * by ssl3_get_finished). */
3578         if (!s->s3->change_cipher_spec)
3579                 {
3580                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS);
3581                 return -1;
3582                 }
3583
3584         if (n < 2)
3585                 return 0;  /* The body must be > 1 bytes long */
3586
3587         p=(unsigned char *)s->init_msg;
3588
3589         /* The payload looks like:
3590          *   uint8 proto_len;
3591          *   uint8 proto[proto_len];
3592          *   uint8 padding_len;
3593          *   uint8 padding[padding_len];
3594          */
3595         proto_len = p[0];
3596         if (proto_len + 2 > s->init_num)
3597                 return 0;
3598         padding_len = p[proto_len + 1];
3599         if (proto_len + padding_len + 2 != s->init_num)
3600                 return 0;
3601
3602         s->next_proto_negotiated = OPENSSL_malloc(proto_len);
3603         if (!s->next_proto_negotiated)
3604                 {
3605                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,ERR_R_MALLOC_FAILURE);
3606                 return 0;
3607                 }
3608         memcpy(s->next_proto_negotiated, p + 1, proto_len);
3609         s->next_proto_negotiated_len = proto_len;
3610
3611         return 1;
3612         }
3613 # endif
3614 #endif