ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124 /* ====================================================================
 125  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 133  * support (see RFC 4279) to OpenSSL.
 134  *
 135  * No patent licenses or other rights except those expressly stated in
 136  * the OpenSSL open source license shall be deemed granted or received
 137  * expressly, by implication, estoppel, or otherwise.
 138  *
 139  * No assurances are provided by Nokia that the Contribution does not
 140  * infringe the patent or other intellectual property rights of any third
 141  * party or that the license provides you with all the necessary rights
 142  * to make use of the Contribution.
 143  *
 144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 148  * OTHERWISE.
 149  */
 150
 151 #define REUSE_CIPHER_BUG
 152 #define NETSCAPE_HANG_BUG
 153
 154 #include <stdio.h>
 155 #include <openssl/crypto.h>
 156 #include "ssl_locl.h"
 157 #include "kssl_lcl.h"
 158 #include <openssl/buffer.h>
 159 #include <openssl/rand.h>
 160 #include <openssl/objects.h>
 161 #include <openssl/evp.h>
 162 #include <openssl/hmac.h>
 163 #include <openssl/x509.h>
 164 #ifndef OPENSSL_NO_DH
 165 #include <openssl/dh.h>
 166 #endif
 167 #include <openssl/bn.h>
 168 #ifndef OPENSSL_NO_KRB5
 169 #include <openssl/krb5_asn.h>
 170 #endif
 171 #include <openssl/md5.h>
 172
 173 static const SSL_METHOD *ssl3_get_server_method(int ver);
 174
 175 static const SSL_METHOD *ssl3_get_server_method(int ver)
 176         {
 177         if (ver == SSL3_VERSION)
 178                 return(SSLv3_server_method());
 179         else
 180                 return(NULL);
 181         }
 182
 183 #ifndef OPENSSL_NO_SRP
 184 static int ssl_check_srp_ext_ClientHello(SSL *s,int *al)
 185         {
 186         int ret = SSL_ERROR_NONE;
 187
 188         *al = SSL_AD_UNRECOGNIZED_NAME;
 189
 190         if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
 191             (s->srp_ctx.TLS_ext_srp_username_callback != NULL))
 192                 {
 193                 if(s->srp_ctx.login == NULL)
 194                         {
 195                         /* RFC 5054 says SHOULD reject,
 196                            we do so if There is no srp login name */
 197                         ret = SSL3_AL_FATAL;
 198                         *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
 199                         }
 200                 else
 201                         {
 202                         ret = SSL_srp_server_param_with_username(s,al);
 203                         }
 204                 }
 205         return ret;
 206         }
 207 #endif
 208
 209 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
 210                         ssl3_accept,
 211                         ssl_undefined_function,
 212                         ssl3_get_server_method)
 213
 214 int ssl3_accept(SSL *s)
 215         {
 216         BUF_MEM *buf;
 217         unsigned long alg_k,Time=(unsigned long)time(NULL);
 218         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 219         int ret= -1;
 220         int new_state,state,skip=0;
 221
 222         RAND_add(&Time,sizeof(Time),0);
 223         ERR_clear_error();
 224         clear_sys_error();
 225
 226         if (s->info_callback != NULL)
 227                 cb=s->info_callback;
 228         else if (s->ctx->info_callback != NULL)
 229                 cb=s->ctx->info_callback;
 230
 231         /* init things to blank */
 232         s->in_handshake++;
 233         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 234
 235         if (s->cert == NULL)
 236                 {
 237                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 238                 return(-1);
 239                 }
 240
 241 #ifndef OPENSSL_NO_HEARTBEATS
 242         /* If we're awaiting a HeartbeatResponse, pretend we
 243          * already got and don't await it anymore, because
 244          * Heartbeats don't make sense during handshakes anyway.
 245          */
 246         if (s->tlsext_hb_pending)
 247                 {
 248                 s->tlsext_hb_pending = 0;
 249                 s->tlsext_hb_seq++;
 250                 }
 251 #endif
 252
 253         for (;;)
 254                 {
 255                 state=s->state;
 256
 257                 switch (s->state)
 258                         {
 259                 case SSL_ST_RENEGOTIATE:
 260                         s->renegotiate=1;
 261                         /* s->state=SSL_ST_ACCEPT; */
 262
 263                 case SSL_ST_BEFORE:
 264                 case SSL_ST_ACCEPT:
 265                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 266                 case SSL_ST_OK|SSL_ST_ACCEPT:
 267
 268                         s->server=1;
 269                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 270
 271                         if ((s->version>>8) != 3)
 272                                 {
 273                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 274                                 return -1;
 275                                 }
 276                         s->type=SSL_ST_ACCEPT;
 277
 278                         if (s->init_buf == NULL)
 279                                 {
 280                                 if ((buf=BUF_MEM_new()) == NULL)
 281                                         {
 282                                         ret= -1;
 283                                         goto end;
 284                                         }
 285                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 286                                         {
 287                                         ret= -1;
 288                                         goto end;
 289                                         }
 290                                 s->init_buf=buf;
 291                                 }
 292
 293                         if (!ssl3_setup_buffers(s))
 294                                 {
 295                                 ret= -1;
 296                                 goto end;
 297                                 }
 298
 299                         s->init_num=0;
 300                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
 301                         s->s3->flags &= ~TLS1_FLAGS_SKIP_CERT_VERIFY;
 302
 303                         if (s->state != SSL_ST_RENEGOTIATE)
 304                                 {
 305                                 /* Ok, we now need to push on a buffering BIO so that
 306                                  * the output is sent in a way that TCP likes :-)
 307                                  */
 308                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 309
 310                                 ssl3_init_finished_mac(s);
 311                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 312                                 s->ctx->stats.sess_accept++;
 313                                 }
 314                         else if (!s->s3->send_connection_binding &&
 315                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
 316                                 {
 317                                 /* Server attempting to renegotiate with
 318                                  * client that doesn't support secure
 319                                  * renegotiation.
 320                                  */
 321                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
 322                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 323                                 ret = -1;
 324                                 goto end;
 325                                 }
 326                         else
 327                                 {
 328                                 /* s->state == SSL_ST_RENEGOTIATE,
 329                                  * we will just send a HelloRequest */
 330                                 s->ctx->stats.sess_accept_renegotiate++;
 331                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 332                                 }
 333                         break;
 334
 335                 case SSL3_ST_SW_HELLO_REQ_A:
 336                 case SSL3_ST_SW_HELLO_REQ_B:
 337
 338                         s->shutdown=0;
 339                         ret=ssl3_send_hello_request(s);
 340                         if (ret <= 0) goto end;
 341                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 342                         s->state=SSL3_ST_SW_FLUSH;
 343                         s->init_num=0;
 344
 345                         ssl3_init_finished_mac(s);
 346                         break;
 347
 348                 case SSL3_ST_SW_HELLO_REQ_C:
 349                         s->state=SSL_ST_OK;
 350                         break;
 351
 352                 case SSL3_ST_SR_CLNT_HELLO_A:
 353                 case SSL3_ST_SR_CLNT_HELLO_B:
 354                 case SSL3_ST_SR_CLNT_HELLO_C:
 355
 356                         if (s->rwstate != SSL_X509_LOOKUP)
 357                         {
 358                                 ret=ssl3_get_client_hello(s);
 359                                 if (ret <= 0) goto end;
 360                         }
 361 #ifndef OPENSSL_NO_SRP
 362                         {
 363                         int al;
 364                         if ((ret = ssl_check_srp_ext_ClientHello(s,&al))  < 0)
 365                                         {
 366                                         /* callback indicates firther work to be done */
 367                                         s->rwstate=SSL_X509_LOOKUP;
 368                                         goto end;
 369                                         }
 370                         if (ret != SSL_ERROR_NONE)
 371                                 {
 372                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 373                                 /* This is not really an error but the only means to
 374                                    for a client to detect whether srp is supported. */
 375                                    if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)
 376                                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);
 377                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
 378                                 ret= -1;
 379                                 goto end;
 380                                 }
 381                         }
 382 #endif
 383
 384                         s->renegotiate = 2;
 385                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 386                         s->init_num=0;
 387                         break;
 388
 389                 case SSL3_ST_SW_SRVR_HELLO_A:
 390                 case SSL3_ST_SW_SRVR_HELLO_B:
 391                         ret=ssl3_send_server_hello(s);
 392                         if (ret <= 0) goto end;
 393 #ifndef OPENSSL_NO_TLSEXT
 394                         if (s->hit)
 395                                 {
 396                                 if (s->tlsext_ticket_expected)
 397                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 398                                 else
 399                                         s->state=SSL3_ST_SW_CHANGE_A;
 400                                 }
 401 #else
 402                         if (s->hit)
 403                                         s->state=SSL3_ST_SW_CHANGE_A;
 404 #endif
 405                         else
 406                                 s->state=SSL3_ST_SW_CERT_A;
 407                         s->init_num=0;
 408                         break;
 409
 410                 case SSL3_ST_SW_CERT_A:
 411                 case SSL3_ST_SW_CERT_B:
 412                         /* Check if it is anon DH or anon ECDH, */
 413                         /* normal PSK or KRB5 or SRP */
 414                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
 415                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
 416                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
 417                                 {
 418                                 ret=ssl3_send_server_certificate(s);
 419                                 if (ret <= 0) goto end;
 420 #ifndef OPENSSL_NO_TLSEXT
 421                                 if (s->tlsext_status_expected)
 422                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 423                                 else
 424                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 425                                 }
 426                         else
 427                                 {
 428                                 skip = 1;
 429                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 430                                 }
 431 #else
 432                                 }
 433                         else
 434                                 skip=1;
 435
 436                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 437 #endif
 438                         s->init_num=0;
 439                         break;
 440
 441                 case SSL3_ST_SW_KEY_EXCH_A:
 442                 case SSL3_ST_SW_KEY_EXCH_B:
 443                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 444
 445                         /* clear this, it may get reset by
 446                          * send_server_key_exchange */
 447                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 448 #ifndef OPENSSL_NO_KRB5
 449                                 && !(alg_k & SSL_kKRB5)
 450 #endif /* OPENSSL_NO_KRB5 */
 451                                 )
 452                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 453                                  * even when forbidden by protocol specs
 454                                  * (handshake may fail as clients are not required to
 455                                  * be able to handle this) */
 456                                 s->s3->tmp.use_rsa_tmp=1;
 457                         else
 458                                 s->s3->tmp.use_rsa_tmp=0;
 459
 460
 461                         /* only send if a DH key exchange, fortezza or
 462                          * RSA but we have a sign only certificate
 463                          *
 464                          * PSK: may send PSK identity hints
 465                          *
 466                          * For ECC ciphersuites, we send a serverKeyExchange
 467                          * message only if the cipher suite is either
 468                          * ECDH-anon or ECDHE. In other cases, the
 469                          * server certificate contains the server's
 470                          * public key for key exchange.
 471                          */
 472                         if (s->s3->tmp.use_rsa_tmp
 473                         /* PSK: send ServerKeyExchange if PSK identity
 474                          * hint if provided */
 475 #ifndef OPENSSL_NO_PSK
 476                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 477 #endif
 478 #ifndef OPENSSL_NO_SRP
 479                             /* SRP: send ServerKeyExchange */
 480                             || (alg_k & SSL_kSRP)
 481 #endif
 482                             || (alg_k & SSL_kEDH)
 483                             || (alg_k & SSL_kEECDH)
 484                             || ((alg_k & SSL_kRSA)
 485                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 486                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 487                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 488                                         )
 489                                     )
 490                                 )
 491                             )
 492                                 {
 493                                 ret=ssl3_send_server_key_exchange(s);
 494                                 if (ret <= 0) goto end;
 495                                 }
 496                         else
 497                                 skip=1;
 498
 499                         s->state=SSL3_ST_SW_CERT_REQ_A;
 500                         s->init_num=0;
 501                         break;
 502
 503                 case SSL3_ST_SW_CERT_REQ_A:
 504                 case SSL3_ST_SW_CERT_REQ_B:
 505                         if (/* don't request cert unless asked for it: */
 506                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 507                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 508                                  * don't request cert during re-negotiation: */
 509                                 ((s->session->peer != NULL) &&
 510                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 511                                 /* never request cert in anonymous ciphersuites
 512                                  * (see section "Certificate request" in SSL 3 drafts
 513                                  * and in RFC 2246): */
 514                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 515                                  /* ... except when the application insists on verification
 516                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 517                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 518                                  /* never request cert in Kerberos ciphersuites */
 519                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
 520                                 /* With normal PSK Certificates and
 521                                  * Certificate Requests are omitted */
 522                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 523                                 {
 524                                 /* no cert request */
 525                                 skip=1;
 526                                 s->s3->tmp.cert_request=0;
 527                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 528                                 if (s->s3->handshake_buffer)
 529                                         if (!ssl3_digest_cached_records(s))
 530                                                 return -1;
 531                                 }
 532                         else
 533                                 {
 534                                 s->s3->tmp.cert_request=1;
 535                                 ret=ssl3_send_certificate_request(s);
 536                                 if (ret <= 0) goto end;
 537 #ifndef NETSCAPE_HANG_BUG
 538                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 539 #else
 540                                 s->state=SSL3_ST_SW_FLUSH;
 541                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 542 #endif
 543                                 s->init_num=0;
 544                                 }
 545                         break;
 546
 547                 case SSL3_ST_SW_SRVR_DONE_A:
 548                 case SSL3_ST_SW_SRVR_DONE_B:
 549                         ret=ssl3_send_server_done(s);
 550                         if (ret <= 0) goto end;
 551                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 552                         s->state=SSL3_ST_SW_FLUSH;
 553                         s->init_num=0;
 554                         break;
 555
 556                 case SSL3_ST_SW_FLUSH:
 557
 558                         /* This code originally checked to see if
 559                          * any data was pending using BIO_CTRL_INFO
 560                          * and then flushed. This caused problems
 561                          * as documented in PR#1939. The proposed
 562                          * fix doesn't completely resolve this issue
 563                          * as buggy implementations of BIO_CTRL_PENDING
 564                          * still exist. So instead we just flush
 565                          * unconditionally.
 566                          */
 567
 568                         s->rwstate=SSL_WRITING;
 569                         if (BIO_flush(s->wbio) <= 0)
 570                                 {
 571                                 ret= -1;
 572                                 goto end;
 573                                 }
 574                         s->rwstate=SSL_NOTHING;
 575
 576                         s->state=s->s3->tmp.next_state;
 577                         break;
 578
 579                 case SSL3_ST_SR_CERT_A:
 580                 case SSL3_ST_SR_CERT_B:
 581                         /* Check for second client hello (MS SGC) */
 582                         ret = ssl3_check_client_hello(s);
 583                         if (ret <= 0)
 584                                 goto end;
 585                         if (ret == 2)
 586                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 587                         else {
 588                                 if (s->s3->tmp.cert_request)
 589                                         {
 590                                         ret=ssl3_get_client_certificate(s);
 591                                         if (ret <= 0) goto end;
 592                                         }
 593                                 s->init_num=0;
 594                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 595                         }
 596                         break;
 597
 598                 case SSL3_ST_SR_KEY_EXCH_A:
 599                 case SSL3_ST_SR_KEY_EXCH_B:
 600                         ret=ssl3_get_client_key_exchange(s);
 601                         if (ret <= 0)
 602                                 goto end;
 603                         if (ret == 2)
 604                                 {
 605                                 /* For the ECDH ciphersuites when
 606                                  * the client sends its ECDH pub key in
 607                                  * a certificate, the CertificateVerify
 608                                  * message is not sent.
 609                                  * Also for GOST ciphersuites when
 610                                  * the client uses its key from the certificate
 611                                  * for key exchange.
 612                                  */
 613 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 614                                 s->state=SSL3_ST_SR_FINISHED_A;
 615 #else
 616                                 if (s->s3->next_proto_neg_seen)
 617                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
 618                                 else
 619                                         s->state=SSL3_ST_SR_FINISHED_A;
 620 #endif
 621                                 s->init_num = 0;
 622                                 }
 623                         else if (TLS1_get_version(s) >= TLS1_2_VERSION)
 624                                 {
 625                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 626                                 s->init_num=0;
 627                                 if (!s->session->peer)
 628                                         break;
 629                                 /* For TLS v1.2 freeze the handshake buffer
 630                                  * at this point and digest cached records.
 631                                  */
 632                                 if (!s->s3->handshake_buffer)
 633                                         {
 634                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
 635                                         return -1;
 636                                         }
 637                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
 638                                 if (!ssl3_digest_cached_records(s))
 639                                         return -1;
 640                                 }
 641                         else
 642                                 {
 643                                 int offset=0;
 644                                 int dgst_num;
 645
 646                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 647                                 s->init_num=0;
 648
 649                                 /* We need to get hashes here so if there is
 650                                  * a client cert, it can be verified
 651                                  * FIXME - digest processing for CertificateVerify
 652                                  * should be generalized. But it is next step
 653                                  */
 654                                 if (s->s3->handshake_buffer)
 655                                         if (!ssl3_digest_cached_records(s))
 656                                                 return -1;
 657                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
 658                                         if (s->s3->handshake_dgst[dgst_num])
 659                                                 {
 660                                                 int dgst_size;
 661
 662                                                 s->method->ssl3_enc->cert_verify_mac(s,EVP_MD_CTX_type(s->s3->handshake_dgst[dgst_num]),&(s->s3->tmp.cert_verify_md[offset]));
 663                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
 664                                                 if (dgst_size < 0)
 665                                                         {
 666                                                         ret = -1;
 667                                                         goto end;
 668                                                         }
 669                                                 offset+=dgst_size;
 670                                                 }
 671                                 }
 672                         break;
 673
 674                 case SSL3_ST_SR_CERT_VRFY_A:
 675                 case SSL3_ST_SR_CERT_VRFY_B:
 676
 677                         /* we should decide if we expected this one */
 678                         ret=ssl3_get_cert_verify(s);
 679                         if (ret <= 0) goto end;
 680
 681 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 682                         s->state=SSL3_ST_SR_FINISHED_A;
 683 #else
 684                         if (s->s3->next_proto_neg_seen)
 685                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
 686                         else
 687                                 s->state=SSL3_ST_SR_FINISHED_A;
 688 #endif
 689                         s->init_num=0;
 690                         break;
 691
 692 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 693                 case SSL3_ST_SR_NEXT_PROTO_A:
 694                 case SSL3_ST_SR_NEXT_PROTO_B:
 695                         ret=ssl3_get_next_proto(s);
 696                         if (ret <= 0) goto end;
 697                         s->init_num = 0;
 698                         s->state=SSL3_ST_SR_FINISHED_A;
 699                         break;
 700 #endif
 701
 702                 case SSL3_ST_SR_FINISHED_A:
 703                 case SSL3_ST_SR_FINISHED_B:
 704                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 705                                 SSL3_ST_SR_FINISHED_B);
 706                         if (ret <= 0) goto end;
 707                         if (s->hit)
 708                                 s->state=SSL_ST_OK;
 709 #ifndef OPENSSL_NO_TLSEXT
 710                         else if (s->tlsext_ticket_expected)
 711                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 712 #endif
 713                         else
 714                                 s->state=SSL3_ST_SW_CHANGE_A;
 715                         s->init_num=0;
 716                         break;
 717
 718 #ifndef OPENSSL_NO_TLSEXT
 719                 case SSL3_ST_SW_SESSION_TICKET_A:
 720                 case SSL3_ST_SW_SESSION_TICKET_B:
 721                         ret=ssl3_send_newsession_ticket(s);
 722                         if (ret <= 0) goto end;
 723                         s->state=SSL3_ST_SW_CHANGE_A;
 724                         s->init_num=0;
 725                         break;
 726
 727                 case SSL3_ST_SW_CERT_STATUS_A:
 728                 case SSL3_ST_SW_CERT_STATUS_B:
 729                         ret=ssl3_send_cert_status(s);
 730                         if (ret <= 0) goto end;
 731                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 732                         s->init_num=0;
 733                         break;
 734
 735 #endif
 736
 737                 case SSL3_ST_SW_CHANGE_A:
 738                 case SSL3_ST_SW_CHANGE_B:
 739
 740                         s->session->cipher=s->s3->tmp.new_cipher;
 741                         if (!s->method->ssl3_enc->setup_key_block(s))
 742                                 { ret= -1; goto end; }
 743
 744                         ret=ssl3_send_change_cipher_spec(s,
 745                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 746
 747                         if (ret <= 0) goto end;
 748                         s->state=SSL3_ST_SW_FINISHED_A;
 749                         s->init_num=0;
 750
 751                         if (!s->method->ssl3_enc->change_cipher_state(s,
 752                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 753                                 {
 754                                 ret= -1;
 755                                 goto end;
 756                                 }
 757
 758                         break;
 759
 760                 case SSL3_ST_SW_FINISHED_A:
 761                 case SSL3_ST_SW_FINISHED_B:
 762                         ret=ssl3_send_finished(s,
 763                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 764                                 s->method->ssl3_enc->server_finished_label,
 765                                 s->method->ssl3_enc->server_finished_label_len);
 766                         if (ret <= 0) goto end;
 767                         s->state=SSL3_ST_SW_FLUSH;
 768                         if (s->hit)
 769                                 {
 770 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 771                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 772 #else
 773                                 if (s->s3->next_proto_neg_seen)
 774                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
 775                                 else
 776                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 777 #endif
 778                                 }
 779                         else
 780                                 s->s3->tmp.next_state=SSL_ST_OK;
 781                         s->init_num=0;
 782                         break;
 783
 784                 case SSL_ST_OK:
 785                         /* clean a few things up */
 786                         ssl3_cleanup_key_block(s);
 787
 788                         BUF_MEM_free(s->init_buf);
 789                         s->init_buf=NULL;
 790
 791                         /* remove buffering on output */
 792                         ssl_free_wbio_buffer(s);
 793
 794                         s->init_num=0;
 795
 796                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
 797                                 {
 798                                 s->renegotiate=0;
 799                                 s->new_session=0;
 800
 801                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 802
 803                                 s->ctx->stats.sess_accept_good++;
 804                                 /* s->server=1; */
 805                                 s->handshake_func=ssl3_accept;
 806
 807                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 808                                 }
 809
 810                         ret = 1;
 811                         goto end;
 812                         /* break; */
 813
 814                 default:
 815                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 816                         ret= -1;
 817                         goto end;
 818                         /* break; */
 819                         }
 820
 821                 if (!s->s3->tmp.reuse_message && !skip)
 822                         {
 823                         if (s->debug)
 824                                 {
 825                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 826                                         goto end;
 827                                 }
 828
 829
 830                         if ((cb != NULL) && (s->state != state))
 831                                 {
 832                                 new_state=s->state;
 833                                 s->state=state;
 834                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 835                                 s->state=new_state;
 836                                 }
 837                         }
 838                 skip=0;
 839                 }
 840 end:
 841         /* BIO_flush(s->wbio); */
 842
 843         s->in_handshake--;
 844         if (cb != NULL)
 845                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 846         return(ret);
 847         }
 848
 849 int ssl3_send_hello_request(SSL *s)
 850         {
 851         unsigned char *p;
 852
 853         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 854                 {
 855                 p=(unsigned char *)s->init_buf->data;
 856                 *(p++)=SSL3_MT_HELLO_REQUEST;
 857                 *(p++)=0;
 858                 *(p++)=0;
 859                 *(p++)=0;
 860
 861                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 862                 /* number of bytes to write */
 863                 s->init_num=4;
 864                 s->init_off=0;
 865                 }
 866
 867         /* SSL3_ST_SW_HELLO_REQ_B */
 868         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 869         }
 870
 871 int ssl3_check_client_hello(SSL *s)
 872         {
 873         int ok;
 874         long n;
 875
 876         /* We only allow the client to restart the handshake once per
 877          * negotiation. */
 878         if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
 879                 {
 880                 SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
 881                 return -1;
 882                 }
 883
 884         /* this function is called when we really expect a Certificate message,
 885          * so permit appropriate message length */
 886         n=s->method->ssl_get_message(s,
 887                 SSL3_ST_SR_CERT_A,
 888                 SSL3_ST_SR_CERT_B,
 889                 -1,
 890                 s->max_cert_list,
 891                 &ok);
 892         if (!ok) return((int)n);
 893         s->s3->tmp.reuse_message = 1;
 894         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 895                 {
 896                 /* Throw away what we have done so far in the current handshake,
 897                  * which will now be aborted. (A full SSL_clear would be too much.) */
 898 #ifndef OPENSSL_NO_DH
 899                 if (s->s3->tmp.dh != NULL)
 900                         {
 901                         DH_free(s->s3->tmp.dh);
 902                         s->s3->tmp.dh = NULL;
 903                         }
 904 #endif
 905 #ifndef OPENSSL_NO_ECDH
 906                 if (s->s3->tmp.ecdh != NULL)
 907                         {
 908                         EC_KEY_free(s->s3->tmp.ecdh);
 909                         s->s3->tmp.ecdh = NULL;
 910                         }
 911 #endif
 912                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
 913                 return 2;
 914                 }
 915         return 1;
 916 }
 917
 918 int ssl3_get_client_hello(SSL *s)
 919         {
 920         int i,j,ok,al,ret= -1;
 921         unsigned int cookie_len;
 922         long n;
 923         unsigned long id;
 924         unsigned char *p,*d,*q;
 925         SSL_CIPHER *c;
 926 #ifndef OPENSSL_NO_COMP
 927         SSL_COMP *comp=NULL;
 928 #endif
 929         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 930
 931         /* We do this so that we will respond with our native type.
 932          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 933          * This down switching should be handled by a different method.
 934          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 935          * TLSv1.
 936          */
 937         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
 938                 )
 939                 {
 940                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 941                 }
 942         s->first_packet=1;
 943         n=s->method->ssl_get_message(s,
 944                 SSL3_ST_SR_CLNT_HELLO_B,
 945                 SSL3_ST_SR_CLNT_HELLO_C,
 946                 SSL3_MT_CLIENT_HELLO,
 947                 SSL3_RT_MAX_PLAIN_LENGTH,
 948                 &ok);
 949
 950         if (!ok) return((int)n);
 951         s->first_packet=0;
 952         d=p=(unsigned char *)s->init_msg;
 953
 954         /* use version from inside client hello, not from record header
 955          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 956         s->client_version=(((int)p[0])<<8)|(int)p[1];
 957         p+=2;
 958
 959         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 960             (s->version != DTLS1_VERSION && s->client_version < s->version))
 961                 {
 962                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 963                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 964                         {
 965                         /* similar to ssl3_get_record, send alert using remote version number */
 966                         s->version = s->client_version;
 967                         }
 968                 al = SSL_AD_PROTOCOL_VERSION;
 969                 goto f_err;
 970                 }
 971
 972         /* If we require cookies and this ClientHello doesn't
 973          * contain one, just return since we do not want to
 974          * allocate any memory yet. So check cookie length...
 975          */
 976         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
 977                 {
 978                 unsigned int session_length, cookie_length;
 979
 980                 session_length = *(p + SSL3_RANDOM_SIZE);
 981                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
 982
 983                 if (cookie_length == 0)
 984                         return 1;
 985                 }
 986
 987         /* load the client random */
 988         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 989         p+=SSL3_RANDOM_SIZE;
 990
 991         /* get the session-id */
 992         j= *(p++);
 993
 994         s->hit=0;
 995         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
 996          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
 997          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
 998          * than a change to default behavior so that applications relying on this for security
 999          * won't even compile against older library versions).
1000          *
1001          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1002          * renegotiation but not a new session (s->new_session remains unset): for servers,
1003          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1004          * setting will be ignored.
1005          */
1006         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1007                 {
1008                 if (!ssl_get_new_session(s,1))
1009                         goto err;
1010                 }
1011         else
1012                 {
1013                 i=ssl_get_prev_session(s, p, j, d + n);
1014                 if (i == 1)
1015                         { /* previous session */
1016                         s->hit=1;
1017                         }
1018                 else if (i == -1)
1019                         goto err;
1020                 else /* i == 0 */
1021                         {
1022                         if (!ssl_get_new_session(s,1))
1023                                 goto err;
1024                         }
1025                 }
1026
1027         p+=j;
1028
1029         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1030                 {
1031                 /* cookie stuff */
1032                 cookie_len = *(p++);
1033
1034                 /*
1035                  * The ClientHello may contain a cookie even if the
1036                  * HelloVerify message has not been sent--make sure that it
1037                  * does not cause an overflow.
1038                  */
1039                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1040                         {
1041                         /* too much data */
1042                         al = SSL_AD_DECODE_ERROR;
1043                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1044                         goto f_err;
1045                         }
1046
1047                 /* verify the cookie if appropriate option is set. */
1048                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1049                         cookie_len > 0)
1050                         {
1051                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1052
1053                         if ( s->ctx->app_verify_cookie_cb != NULL)
1054                                 {
1055                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1056                                         cookie_len) == 0)
1057                                         {
1058                                         al=SSL_AD_HANDSHAKE_FAILURE;
1059                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1060                                                 SSL_R_COOKIE_MISMATCH);
1061                                         goto f_err;
1062                                         }
1063                                 /* else cookie verification succeeded */
1064                                 }
1065                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
1066                                                   s->d1->cookie_len) != 0) /* default verification */
1067                                 {
1068                                         al=SSL_AD_HANDSHAKE_FAILURE;
1069                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1070                                                 SSL_R_COOKIE_MISMATCH);
1071                                         goto f_err;
1072                                 }
1073
1074                         ret = 2;
1075                         }
1076
1077                 p += cookie_len;
1078                 }
1079
1080         n2s(p,i);
1081         if ((i == 0) && (j != 0))
1082                 {
1083                 /* we need a cipher if we are not resuming a session */
1084                 al=SSL_AD_ILLEGAL_PARAMETER;
1085                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1086                 goto f_err;
1087                 }
1088         if ((p+i) >= (d+n))
1089                 {
1090                 /* not enough data */
1091                 al=SSL_AD_DECODE_ERROR;
1092                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1093                 goto f_err;
1094                 }
1095         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1096                 == NULL))
1097                 {
1098                 goto err;
1099                 }
1100         p+=i;
1101
1102         /* If it is a hit, check that the cipher is in the list */
1103         if ((s->hit) && (i > 0))
1104                 {
1105                 j=0;
1106                 id=s->session->cipher->id;
1107
1108 #ifdef CIPHER_DEBUG
1109                 printf("client sent %d ciphers\n",sk_num(ciphers));
1110 #endif
1111                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1112                         {
1113                         c=sk_SSL_CIPHER_value(ciphers,i);
1114 #ifdef CIPHER_DEBUG
1115                         printf("client [%2d of %2d]:%s\n",
1116                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1117 #endif
1118                         if (c->id == id)
1119                                 {
1120                                 j=1;
1121                                 break;
1122                                 }
1123                         }
1124 /* Disabled because it can be used in a ciphersuite downgrade
1125  * attack: CVE-2010-4180.
1126  */
1127 #if 0
1128                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1129                         {
1130                         /* Special case as client bug workaround: the previously used cipher may
1131                          * not be in the current list, the client instead might be trying to
1132                          * continue using a cipher that before wasn't chosen due to server
1133                          * preferences.  We'll have to reject the connection if the cipher is not
1134                          * enabled, though. */
1135                         c = sk_SSL_CIPHER_value(ciphers, 0);
1136                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1137                                 {
1138                                 s->session->cipher = c;
1139                                 j = 1;
1140                                 }
1141                         }
1142 #endif
1143                 if (j == 0)
1144                         {
1145                         /* we need to have the cipher in the cipher
1146                          * list if we are asked to reuse it */
1147                         al=SSL_AD_ILLEGAL_PARAMETER;
1148                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1149                         goto f_err;
1150                         }
1151                 }
1152
1153         /* compression */
1154         i= *(p++);
1155         if ((p+i) > (d+n))
1156                 {
1157                 /* not enough data */
1158                 al=SSL_AD_DECODE_ERROR;
1159                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1160                 goto f_err;
1161                 }
1162         q=p;
1163         for (j=0; j<i; j++)
1164                 {
1165                 if (p[j] == 0) break;
1166                 }
1167
1168         p+=i;
1169         if (j >= i)
1170                 {
1171                 /* no compress */
1172                 al=SSL_AD_DECODE_ERROR;
1173                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1174                 goto f_err;
1175                 }
1176
1177 #ifndef OPENSSL_NO_TLSEXT
1178         /* TLS extensions*/
1179         if (s->version >= SSL3_VERSION)
1180                 {
1181                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1182                         {
1183                         /* 'al' set by ssl_parse_clienthello_tlsext */
1184                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1185                         goto f_err;
1186                         }
1187                 }
1188                 if (ssl_check_clienthello_tlsext(s) <= 0) {
1189                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1190                         goto err;
1191                 }
1192
1193         /* Check if we want to use external pre-shared secret for this
1194          * handshake for not reused session only. We need to generate
1195          * server_random before calling tls_session_secret_cb in order to allow
1196          * SessionTicket processing to use it in key derivation. */
1197         {
1198                 unsigned long Time;
1199                 unsigned char *pos;
1200                 Time=(unsigned long)time(NULL);                 /* Time */
1201                 pos=s->s3->server_random;
1202                 l2n(Time,pos);
1203                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1204                         {
1205                         al=SSL_AD_INTERNAL_ERROR;
1206                         goto f_err;
1207                         }
1208         }
1209
1210         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1211                 {
1212                 SSL_CIPHER *pref_cipher=NULL;
1213
1214                 s->session->master_key_length=sizeof(s->session->master_key);
1215                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1216                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1217                         {
1218                         s->hit=1;
1219                         s->session->ciphers=ciphers;
1220                         s->session->verify_result=X509_V_OK;
1221
1222                         ciphers=NULL;
1223
1224                         /* check if some cipher was preferred by call back */
1225                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1226                         if (pref_cipher == NULL)
1227                                 {
1228                                 al=SSL_AD_HANDSHAKE_FAILURE;
1229                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1230                                 goto f_err;
1231                                 }
1232
1233                         s->session->cipher=pref_cipher;
1234
1235                         if (s->cipher_list)
1236                                 sk_SSL_CIPHER_free(s->cipher_list);
1237
1238                         if (s->cipher_list_by_id)
1239                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1240
1241                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1242                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1243                         }
1244                 }
1245 #endif
1246
1247         /* Worst case, we will use the NULL compression, but if we have other
1248          * options, we will now look for them.  We have i-1 compression
1249          * algorithms from the client, starting at q. */
1250         s->s3->tmp.new_compression=NULL;
1251 #ifndef OPENSSL_NO_COMP
1252         /* This only happens if we have a cache hit */
1253         if (s->session->compress_meth != 0)
1254                 {
1255                 int m, comp_id = s->session->compress_meth;
1256                 /* Perform sanity checks on resumed compression algorithm */
1257                 /* Can't disable compression */
1258                 if (s->options & SSL_OP_NO_COMPRESSION)
1259                         {
1260                         al=SSL_AD_INTERNAL_ERROR;
1261                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1262                         goto f_err;
1263                         }
1264                 /* Look for resumed compression method */
1265                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1266                         {
1267                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1268                         if (comp_id == comp->id)
1269                                 {
1270                                 s->s3->tmp.new_compression=comp;
1271                                 break;
1272                                 }
1273                         }
1274                 if (s->s3->tmp.new_compression == NULL)
1275                         {
1276                         al=SSL_AD_INTERNAL_ERROR;
1277                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1278                         goto f_err;
1279                         }
1280                 /* Look for resumed method in compression list */
1281                 for (m = 0; m < i; m++)
1282                         {
1283                         if (q[m] == comp_id)
1284                                 break;
1285                         }
1286                 if (m >= i)
1287                         {
1288                         al=SSL_AD_ILLEGAL_PARAMETER;
1289                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1290                         goto f_err;
1291                         }
1292                 }
1293         else if (s->hit)
1294                 comp = NULL;
1295         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1296                 { /* See if we have a match */
1297                 int m,nn,o,v,done=0;
1298
1299                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1300                 for (m=0; m<nn; m++)
1301                         {
1302                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1303                         v=comp->id;
1304                         for (o=0; o<i; o++)
1305                                 {
1306                                 if (v == q[o])
1307                                         {
1308                                         done=1;
1309                                         break;
1310                                         }
1311                                 }
1312                         if (done) break;
1313                         }
1314                 if (done)
1315                         s->s3->tmp.new_compression=comp;
1316                 else
1317                         comp=NULL;
1318                 }
1319 #else
1320         /* If compression is disabled we'd better not try to resume a session
1321          * using compression.
1322          */
1323         if (s->session->compress_meth != 0)
1324                 {
1325                 al=SSL_AD_INTERNAL_ERROR;
1326                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1327                 goto f_err;
1328                 }
1329 #endif
1330
1331         /* Given s->session->ciphers and SSL_get_ciphers, we must
1332          * pick a cipher */
1333
1334         if (!s->hit)
1335                 {
1336 #ifdef OPENSSL_NO_COMP
1337                 s->session->compress_meth=0;
1338 #else
1339                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1340 #endif
1341                 if (s->session->ciphers != NULL)
1342                         sk_SSL_CIPHER_free(s->session->ciphers);
1343                 s->session->ciphers=ciphers;
1344                 if (ciphers == NULL)
1345                         {
1346                         al=SSL_AD_ILLEGAL_PARAMETER;
1347                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1348                         goto f_err;
1349                         }
1350                 ciphers=NULL;
1351                 c=ssl3_choose_cipher(s,s->session->ciphers,
1352                                      SSL_get_ciphers(s));
1353
1354                 if (c == NULL)
1355                         {
1356                         al=SSL_AD_HANDSHAKE_FAILURE;
1357                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1358                         goto f_err;
1359                         }
1360                 s->s3->tmp.new_cipher=c;
1361                 /* check whether we should disable session resumption */
1362                 if (s->not_resumable_session_cb != NULL)
1363                         s->session->not_resumable=s->not_resumable_session_cb(s,
1364                                 ((c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)) != 0));
1365                 if (s->session->not_resumable)
1366                         /* do not send a session ticket */
1367                         s->tlsext_ticket_expected = 0;
1368                 }
1369         else
1370                 {
1371                 /* Session-id reuse */
1372 #ifdef REUSE_CIPHER_BUG
1373                 STACK_OF(SSL_CIPHER) *sk;
1374                 SSL_CIPHER *nc=NULL;
1375                 SSL_CIPHER *ec=NULL;
1376
1377                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1378                         {
1379                         sk=s->session->ciphers;
1380                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1381                                 {
1382                                 c=sk_SSL_CIPHER_value(sk,i);
1383                                 if (c->algorithm_enc & SSL_eNULL)
1384                                         nc=c;
1385                                 if (SSL_C_IS_EXPORT(c))
1386                                         ec=c;
1387                                 }
1388                         if (nc != NULL)
1389                                 s->s3->tmp.new_cipher=nc;
1390                         else if (ec != NULL)
1391                                 s->s3->tmp.new_cipher=ec;
1392                         else
1393                                 s->s3->tmp.new_cipher=s->session->cipher;
1394                         }
1395                 else
1396 #endif
1397                 s->s3->tmp.new_cipher=s->session->cipher;
1398                 }
1399
1400         if (TLS1_get_version(s) < TLS1_2_VERSION || !(s->verify_mode & SSL_VERIFY_PEER))
1401                 {
1402                 if (!ssl3_digest_cached_records(s))
1403                         goto f_err;
1404                 }
1405
1406         /* we now have the following setup.
1407          * client_random
1408          * cipher_list          - our prefered list of ciphers
1409          * ciphers              - the clients prefered list of ciphers
1410          * compression          - basically ignored right now
1411          * ssl version is set   - sslv3
1412          * s->session           - The ssl session has been setup.
1413          * s->hit               - session reuse flag
1414          * s->tmp.new_cipher    - the new cipher to use.
1415          */
1416
1417         if (ret < 0) ret=1;
1418         if (0)
1419                 {
1420 f_err:
1421                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1422                 }
1423 err:
1424         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1425         return(ret);
1426         }
1427
1428 int ssl3_send_server_hello(SSL *s)
1429         {
1430         unsigned char *buf;
1431         unsigned char *p,*d;
1432         int i,sl;
1433         unsigned long l;
1434 #ifdef OPENSSL_NO_TLSEXT
1435         unsigned long Time;
1436 #endif
1437
1438         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1439                 {
1440                 buf=(unsigned char *)s->init_buf->data;
1441 #ifdef OPENSSL_NO_TLSEXT
1442                 p=s->s3->server_random;
1443                 /* Generate server_random if it was not needed previously */
1444                 Time=(unsigned long)time(NULL);                 /* Time */
1445                 l2n(Time,p);
1446                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1447                         return -1;
1448 #endif
1449                 /* Do the message type and length last */
1450                 d=p= &(buf[4]);
1451
1452                 *(p++)=s->version>>8;
1453                 *(p++)=s->version&0xff;
1454
1455                 /* Random stuff */
1456                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1457                 p+=SSL3_RANDOM_SIZE;
1458
1459                 /* There are several cases for the session ID to send
1460                  * back in the server hello:
1461                  * - For session reuse from the session cache,
1462                  *   we send back the old session ID.
1463                  * - If stateless session reuse (using a session ticket)
1464                  *   is successful, we send back the client's "session ID"
1465                  *   (which doesn't actually identify the session).
1466                  * - If it is a new session, we send back the new
1467                  *   session ID.
1468                  * - However, if we want the new session to be single-use,
1469                  *   we send back a 0-length session ID.
1470                  * s->hit is non-zero in either case of session reuse,
1471                  * so the following won't overwrite an ID that we're supposed
1472                  * to send back.
1473                  */
1474                 if (s->session->not_resumable ||
1475                         (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1476                                 && !s->hit))
1477                         s->session->session_id_length=0;
1478
1479                 sl=s->session->session_id_length;
1480                 if (sl > (int)sizeof(s->session->session_id))
1481                         {
1482                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1483                         return -1;
1484                         }
1485                 *(p++)=sl;
1486                 memcpy(p,s->session->session_id,sl);
1487                 p+=sl;
1488
1489                 /* put the cipher */
1490                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1491                 p+=i;
1492
1493                 /* put the compression method */
1494 #ifdef OPENSSL_NO_COMP
1495                         *(p++)=0;
1496 #else
1497                 if (s->s3->tmp.new_compression == NULL)
1498                         *(p++)=0;
1499                 else
1500                         *(p++)=s->s3->tmp.new_compression->id;
1501 #endif
1502 #ifndef OPENSSL_NO_TLSEXT
1503                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1504                         {
1505                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1506                         return -1;
1507                         }
1508                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1509                         {
1510                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1511                         return -1;
1512                         }
1513 #endif
1514                 /* do the header */
1515                 l=(p-d);
1516                 d=buf;
1517                 *(d++)=SSL3_MT_SERVER_HELLO;
1518                 l2n3(l,d);
1519
1520                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1521                 /* number of bytes to write */
1522                 s->init_num=p-buf;
1523                 s->init_off=0;
1524                 }
1525
1526         /* SSL3_ST_SW_SRVR_HELLO_B */
1527         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1528         }
1529
1530 int ssl3_send_server_done(SSL *s)
1531         {
1532         unsigned char *p;
1533
1534         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1535                 {
1536                 p=(unsigned char *)s->init_buf->data;
1537
1538                 /* do the header */
1539                 *(p++)=SSL3_MT_SERVER_DONE;
1540                 *(p++)=0;
1541                 *(p++)=0;
1542                 *(p++)=0;
1543
1544                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1545                 /* number of bytes to write */
1546                 s->init_num=4;
1547                 s->init_off=0;
1548                 }
1549
1550         /* SSL3_ST_SW_SRVR_DONE_B */
1551         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1552         }
1553
1554 int ssl3_send_server_key_exchange(SSL *s)
1555         {
1556 #ifndef OPENSSL_NO_RSA
1557         unsigned char *q;
1558         int j,num;
1559         RSA *rsa;
1560         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1561         unsigned int u;
1562 #endif
1563 #ifndef OPENSSL_NO_DH
1564         DH *dh=NULL,*dhp;
1565 #endif
1566 #ifndef OPENSSL_NO_ECDH
1567         EC_KEY *ecdh=NULL, *ecdhp;
1568         unsigned char *encodedPoint = NULL;
1569         int encodedlen = 0;
1570         int curve_id = 0;
1571         BN_CTX *bn_ctx = NULL;
1572 #endif
1573         EVP_PKEY *pkey;
1574         const EVP_MD *md = NULL;
1575         unsigned char *p,*d;
1576         int al,i;
1577         unsigned long type;
1578         int n;
1579         CERT *cert;
1580         BIGNUM *r[4];
1581         int nr[4],kn;
1582         BUF_MEM *buf;
1583         EVP_MD_CTX md_ctx;
1584
1585         EVP_MD_CTX_init(&md_ctx);
1586         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1587                 {
1588                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1589                 cert=s->cert;
1590
1591                 buf=s->init_buf;
1592
1593                 r[0]=r[1]=r[2]=r[3]=NULL;
1594                 n=0;
1595 #ifndef OPENSSL_NO_RSA
1596                 if (type & SSL_kRSA)
1597                         {
1598                         rsa=cert->rsa_tmp;
1599                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1600                                 {
1601                                 rsa=s->cert->rsa_tmp_cb(s,
1602                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1603                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1604                                 if(rsa == NULL)
1605                                 {
1606                                         al=SSL_AD_HANDSHAKE_FAILURE;
1607                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1608                                         goto f_err;
1609                                 }
1610                                 RSA_up_ref(rsa);
1611                                 cert->rsa_tmp=rsa;
1612                                 }
1613                         if (rsa == NULL)
1614                                 {
1615                                 al=SSL_AD_HANDSHAKE_FAILURE;
1616                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1617                                 goto f_err;
1618                                 }
1619                         r[0]=rsa->n;
1620                         r[1]=rsa->e;
1621                         s->s3->tmp.use_rsa_tmp=1;
1622                         }
1623                 else
1624 #endif
1625 #ifndef OPENSSL_NO_DH
1626                         if (type & SSL_kEDH)
1627                         {
1628                         dhp=cert->dh_tmp;
1629                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1630                                 dhp=s->cert->dh_tmp_cb(s,
1631                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1632                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1633                         if (dhp == NULL)
1634                                 {
1635                                 al=SSL_AD_HANDSHAKE_FAILURE;
1636                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1637                                 goto f_err;
1638                                 }
1639
1640                         if (s->s3->tmp.dh != NULL)
1641                                 {
1642                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1643                                 goto err;
1644                                 }
1645
1646                         if ((dh=DHparams_dup(dhp)) == NULL)
1647                                 {
1648                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1649                                 goto err;
1650                                 }
1651
1652                         s->s3->tmp.dh=dh;
1653                         if ((dhp->pub_key == NULL ||
1654                              dhp->priv_key == NULL ||
1655                              (s->options & SSL_OP_SINGLE_DH_USE)))
1656                                 {
1657                                 if(!DH_generate_key(dh))
1658                                     {
1659                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1660                                            ERR_R_DH_LIB);
1661                                     goto err;
1662                                     }
1663                                 }
1664                         else
1665                                 {
1666                                 dh->pub_key=BN_dup(dhp->pub_key);
1667                                 dh->priv_key=BN_dup(dhp->priv_key);
1668                                 if ((dh->pub_key == NULL) ||
1669                                         (dh->priv_key == NULL))
1670                                         {
1671                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1672                                         goto err;
1673                                         }
1674                                 }
1675                         r[0]=dh->p;
1676                         r[1]=dh->g;
1677                         r[2]=dh->pub_key;
1678                         }
1679                 else
1680 #endif
1681 #ifndef OPENSSL_NO_ECDH
1682                         if (type & SSL_kEECDH)
1683                         {
1684                         const EC_GROUP *group;
1685
1686                         ecdhp=cert->ecdh_tmp;
1687                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1688                                 {
1689                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1690                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1691                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1692                                 }
1693                         if (ecdhp == NULL)
1694                                 {
1695                                 al=SSL_AD_HANDSHAKE_FAILURE;
1696                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1697                                 goto f_err;
1698                                 }
1699
1700                         if (s->s3->tmp.ecdh != NULL)
1701                                 {
1702                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1703                                 goto err;
1704                                 }
1705
1706                         /* Duplicate the ECDH structure. */
1707                         if (ecdhp == NULL)
1708                                 {
1709                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1710                                 goto err;
1711                                 }
1712                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1713                                 {
1714                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1715                                 goto err;
1716                                 }
1717
1718                         s->s3->tmp.ecdh=ecdh;
1719                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1720                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1721                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1722                                 {
1723                                 if(!EC_KEY_generate_key(ecdh))
1724                                     {
1725                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1726                                     goto err;
1727                                     }
1728                                 }
1729
1730                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1731                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1732                             (EC_KEY_get0_private_key(ecdh) == NULL))
1733                                 {
1734                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1735                                 goto err;
1736                                 }
1737
1738                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1739                             (EC_GROUP_get_degree(group) > 163))
1740                                 {
1741                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1742                                 goto err;
1743                                 }
1744
1745                         /* XXX: For now, we only support ephemeral ECDH
1746                          * keys over named (not generic) curves. For
1747                          * supported named curves, curve_id is non-zero.
1748                          */
1749                         if ((curve_id =
1750                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1751                             == 0)
1752                                 {
1753                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1754                                 goto err;
1755                                 }
1756
1757                         /* Encode the public key.
1758                          * First check the size of encoding and
1759                          * allocate memory accordingly.
1760                          */
1761                         encodedlen = EC_POINT_point2oct(group,
1762                             EC_KEY_get0_public_key(ecdh),
1763                             POINT_CONVERSION_UNCOMPRESSED,
1764                             NULL, 0, NULL);
1765
1766                         encodedPoint = (unsigned char *)
1767                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1768                         bn_ctx = BN_CTX_new();
1769                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1770                                 {
1771                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1772                                 goto err;
1773                                 }
1774
1775
1776                         encodedlen = EC_POINT_point2oct(group,
1777                             EC_KEY_get0_public_key(ecdh),
1778                             POINT_CONVERSION_UNCOMPRESSED,
1779                             encodedPoint, encodedlen, bn_ctx);
1780
1781                         if (encodedlen == 0)
1782                                 {
1783                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1784                                 goto err;
1785                                 }
1786
1787                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1788
1789                         /* XXX: For now, we only support named (not
1790                          * generic) curves in ECDH ephemeral key exchanges.
1791                          * In this situation, we need four additional bytes
1792                          * to encode the entire ServerECDHParams
1793                          * structure.
1794                          */
1795                         n = 4 + encodedlen;
1796
1797                         /* We'll generate the serverKeyExchange message
1798                          * explicitly so we can set these to NULLs
1799                          */
1800                         r[0]=NULL;
1801                         r[1]=NULL;
1802                         r[2]=NULL;
1803                         r[3]=NULL;
1804                         }
1805                 else
1806 #endif /* !OPENSSL_NO_ECDH */
1807 #ifndef OPENSSL_NO_PSK
1808                         if (type & SSL_kPSK)
1809                                 {
1810                                 /* reserve size for record length and PSK identity hint*/
1811                                 n+=2+strlen(s->ctx->psk_identity_hint);
1812                                 }
1813                         else
1814 #endif /* !OPENSSL_NO_PSK */
1815 #ifndef OPENSSL_NO_SRP
1816                 if (type & SSL_kSRP)
1817                         {
1818                         if ((s->srp_ctx.N == NULL) ||
1819                                 (s->srp_ctx.g == NULL) ||
1820                                 (s->srp_ctx.s == NULL) ||
1821                                 (s->srp_ctx.B == NULL))
1822                                 {
1823                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1824                                 goto err;
1825                                 }
1826                         r[0]=s->srp_ctx.N;
1827                         r[1]=s->srp_ctx.g;
1828                         r[2]=s->srp_ctx.s;
1829                         r[3]=s->srp_ctx.B;
1830                         }
1831                 else
1832 #endif
1833                         {
1834                         al=SSL_AD_HANDSHAKE_FAILURE;
1835                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1836                         goto f_err;
1837                         }
1838                 for (i=0; r[i] != NULL && i<4; i++)
1839                         {
1840                         nr[i]=BN_num_bytes(r[i]);
1841 #ifndef OPENSSL_NO_SRP
1842                         if ((i == 2) && (type & SSL_kSRP))
1843                                 n+=1+nr[i];
1844                         else
1845 #endif
1846                         n+=2+nr[i];
1847                         }
1848
1849                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1850                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1851                         {
1852                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1853                                 == NULL)
1854                                 {
1855                                 al=SSL_AD_DECODE_ERROR;
1856                                 goto f_err;
1857                                 }
1858                         kn=EVP_PKEY_size(pkey);
1859                         }
1860                 else
1861                         {
1862                         pkey=NULL;
1863                         kn=0;
1864                         }
1865
1866                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1867                         {
1868                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1869                         goto err;
1870                         }
1871                 d=(unsigned char *)s->init_buf->data;
1872                 p= &(d[4]);
1873
1874                 for (i=0; r[i] != NULL && i<4; i++)
1875                         {
1876 #ifndef OPENSSL_NO_SRP
1877                         if ((i == 2) && (type & SSL_kSRP))
1878                                 {
1879                                 *p = nr[i];
1880                                 p++;
1881                                 }
1882                         else
1883 #endif
1884                         s2n(nr[i],p);
1885                         BN_bn2bin(r[i],p);
1886                         p+=nr[i];
1887                         }
1888
1889 #ifndef OPENSSL_NO_ECDH
1890                 if (type & SSL_kEECDH)
1891                         {
1892                         /* XXX: For now, we only support named (not generic) curves.
1893                          * In this situation, the serverKeyExchange message has:
1894                          * [1 byte CurveType], [2 byte CurveName]
1895                          * [1 byte length of encoded point], followed by
1896                          * the actual encoded point itself
1897                          */
1898                         *p = NAMED_CURVE_TYPE;
1899                         p += 1;
1900                         *p = 0;
1901                         p += 1;
1902                         *p = curve_id;
1903                         p += 1;
1904                         *p = encodedlen;
1905                         p += 1;
1906                         memcpy((unsigned char*)p,
1907                             (unsigned char *)encodedPoint,
1908                             encodedlen);
1909                         OPENSSL_free(encodedPoint);
1910                         encodedPoint = NULL;
1911                         p += encodedlen;
1912                         }
1913 #endif
1914
1915 #ifndef OPENSSL_NO_PSK
1916                 if (type & SSL_kPSK)
1917                         {
1918                         /* copy PSK identity hint */
1919                         s2n(strlen(s->ctx->psk_identity_hint), p);
1920                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1921                         p+=strlen(s->ctx->psk_identity_hint);
1922                         }
1923 #endif
1924
1925                 /* not anonymous */
1926                 if (pkey != NULL)
1927                         {
1928                         /* n is the length of the params, they start at &(d[4])
1929                          * and p points to the space at the end. */
1930 #ifndef OPENSSL_NO_RSA
1931                         if (pkey->type == EVP_PKEY_RSA
1932                                         && TLS1_get_version(s) < TLS1_2_VERSION)
1933                                 {
1934                                 q=md_buf;
1935                                 j=0;
1936                                 for (num=2; num > 0; num--)
1937                                         {
1938                                         EVP_MD_CTX_set_flags(&md_ctx,
1939                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1940                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1941                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1942                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1943                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1944                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1945                                         EVP_DigestFinal_ex(&md_ctx,q,
1946                                                 (unsigned int *)&i);
1947                                         q+=i;
1948                                         j+=i;
1949                                         }
1950                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1951                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1952                                         {
1953                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1954                                         goto err;
1955                                         }
1956                                 s2n(u,p);
1957                                 n+=u+2;
1958                                 }
1959                         else
1960 #endif
1961                         if (md)
1962                                 {
1963                                 /* For TLS1.2 and later send signature
1964                                  * algorithm */
1965                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1966                                         {
1967                                         if (!tls12_get_sigandhash(p, pkey, md))
1968                                                 {
1969                                                 /* Should never happen */
1970                                                 al=SSL_AD_INTERNAL_ERROR;
1971                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1972                                                 goto f_err;
1973                                                 }
1974                                         p+=2;
1975                                         }
1976 #ifdef SSL_DEBUG
1977                                 fprintf(stderr, "Using hash %s\n",
1978                                                         EVP_MD_name(md));
1979 #endif
1980                                 EVP_SignInit_ex(&md_ctx, md, NULL);
1981                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1982                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1983                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1984                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1985                                         (unsigned int *)&i,pkey))
1986                                         {
1987                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
1988                                         goto err;
1989                                         }
1990                                 s2n(i,p);
1991                                 n+=i+2;
1992                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1993                                         n+= 2;
1994                                 }
1995                         else
1996                                 {
1997                                 /* Is this error check actually needed? */
1998                                 al=SSL_AD_HANDSHAKE_FAILURE;
1999                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2000                                 goto f_err;
2001                                 }
2002                         }
2003
2004                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
2005                 l2n3(n,d);
2006
2007                 /* we should now have things packed up, so lets send
2008                  * it off */
2009                 s->init_num=n+4;
2010                 s->init_off=0;
2011                 }
2012
2013         s->state = SSL3_ST_SW_KEY_EXCH_B;
2014         EVP_MD_CTX_cleanup(&md_ctx);
2015         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2016 f_err:
2017         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2018 err:
2019 #ifndef OPENSSL_NO_ECDH
2020         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2021         BN_CTX_free(bn_ctx);
2022 #endif
2023         EVP_MD_CTX_cleanup(&md_ctx);
2024         return(-1);
2025         }
2026
2027 int ssl3_send_certificate_request(SSL *s)
2028         {
2029         unsigned char *p,*d;
2030         int i,j,nl,off,n;
2031         STACK_OF(X509_NAME) *sk=NULL;
2032         X509_NAME *name;
2033         BUF_MEM *buf;
2034
2035         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2036                 {
2037                 buf=s->init_buf;
2038
2039                 d=p=(unsigned char *)&(buf->data[4]);
2040
2041                 /* get the list of acceptable cert types */
2042                 p++;
2043                 n=ssl3_get_req_cert_type(s,p);
2044                 d[0]=n;
2045                 p+=n;
2046                 n++;
2047
2048                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2049                         {
2050                         nl = tls12_get_req_sig_algs(s, p + 2);
2051                         s2n(nl, p);
2052                         p += nl + 2;
2053                         n += nl + 2;
2054                         }
2055
2056                 off=n;
2057                 p+=2;
2058                 n+=2;
2059
2060                 sk=SSL_get_client_CA_list(s);
2061                 nl=0;
2062                 if (sk != NULL)
2063                         {
2064                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2065                                 {
2066                                 name=sk_X509_NAME_value(sk,i);
2067                                 j=i2d_X509_NAME(name,NULL);
2068                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2069                                         {
2070                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2071                                         goto err;
2072                                         }
2073                                 p=(unsigned char *)&(buf->data[4+n]);
2074                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2075                                         {
2076                                         s2n(j,p);
2077                                         i2d_X509_NAME(name,&p);
2078                                         n+=2+j;
2079                                         nl+=2+j;
2080                                         }
2081                                 else
2082                                         {
2083                                         d=p;
2084                                         i2d_X509_NAME(name,&p);
2085                                         j-=2; s2n(j,d); j+=2;
2086                                         n+=j;
2087                                         nl+=j;
2088                                         }
2089                                 }
2090                         }
2091                 /* else no CA names */
2092                 p=(unsigned char *)&(buf->data[4+off]);
2093                 s2n(nl,p);
2094
2095                 d=(unsigned char *)buf->data;
2096                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
2097                 l2n3(n,d);
2098
2099                 /* we should now have things packed up, so lets send
2100                  * it off */
2101
2102                 s->init_num=n+4;
2103                 s->init_off=0;
2104 #ifdef NETSCAPE_HANG_BUG
2105                 p=(unsigned char *)s->init_buf->data + s->init_num;
2106
2107                 /* do the header */
2108                 *(p++)=SSL3_MT_SERVER_DONE;
2109                 *(p++)=0;
2110                 *(p++)=0;
2111                 *(p++)=0;
2112                 s->init_num += 4;
2113 #endif
2114
2115                 s->state = SSL3_ST_SW_CERT_REQ_B;
2116                 }
2117
2118         /* SSL3_ST_SW_CERT_REQ_B */
2119         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2120 err:
2121         return(-1);
2122         }
2123
2124 int ssl3_get_client_key_exchange(SSL *s)
2125         {
2126         int i,al,ok;
2127         long n;
2128         unsigned long alg_k;
2129         unsigned char *p;
2130 #ifndef OPENSSL_NO_RSA
2131         RSA *rsa=NULL;
2132         EVP_PKEY *pkey=NULL;
2133 #endif
2134 #ifndef OPENSSL_NO_DH
2135         BIGNUM *pub=NULL;
2136         DH *dh_srvr, *dh_clnt = NULL;
2137 #endif
2138 #ifndef OPENSSL_NO_KRB5
2139         KSSL_ERR kssl_err;
2140 #endif /* OPENSSL_NO_KRB5 */
2141
2142 #ifndef OPENSSL_NO_ECDH
2143         EC_KEY *srvr_ecdh = NULL;
2144         EVP_PKEY *clnt_pub_pkey = NULL;
2145         EC_POINT *clnt_ecpoint = NULL;
2146         BN_CTX *bn_ctx = NULL;
2147 #endif
2148
2149         n=s->method->ssl_get_message(s,
2150                 SSL3_ST_SR_KEY_EXCH_A,
2151                 SSL3_ST_SR_KEY_EXCH_B,
2152                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2153                 2048, /* ??? */
2154                 &ok);
2155
2156         if (!ok) return((int)n);
2157         p=(unsigned char *)s->init_msg;
2158
2159         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2160
2161 #ifndef OPENSSL_NO_RSA
2162         if (alg_k & SSL_kRSA)
2163                 {
2164                 /* FIX THIS UP EAY EAY EAY EAY */
2165                 if (s->s3->tmp.use_rsa_tmp)
2166                         {
2167                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2168                                 rsa=s->cert->rsa_tmp;
2169                         /* Don't do a callback because rsa_tmp should
2170                          * be sent already */
2171                         if (rsa == NULL)
2172                                 {
2173                                 al=SSL_AD_HANDSHAKE_FAILURE;
2174                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2175                                 goto f_err;
2176
2177                                 }
2178                         }
2179                 else
2180                         {
2181                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2182                         if (    (pkey == NULL) ||
2183                                 (pkey->type != EVP_PKEY_RSA) ||
2184                                 (pkey->pkey.rsa == NULL))
2185                                 {
2186                                 al=SSL_AD_HANDSHAKE_FAILURE;
2187                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2188                                 goto f_err;
2189                                 }
2190                         rsa=pkey->pkey.rsa;
2191                         }
2192
2193                 /* TLS and [incidentally] DTLS{0xFEFF} */
2194                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2195                         {
2196                         n2s(p,i);
2197                         if (n != i+2)
2198                                 {
2199                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2200                                         {
2201                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2202                                         goto err;
2203                                         }
2204                                 else
2205                                         p-=2;
2206                                 }
2207                         else
2208                                 n=i;
2209                         }
2210
2211                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2212
2213                 al = -1;
2214
2215                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2216                         {
2217                         al=SSL_AD_DECODE_ERROR;
2218                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2219                         }
2220
2221                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2222                         {
2223                         /* The premaster secret must contain the same version number as the
2224                          * ClientHello to detect version rollback attacks (strangely, the
2225                          * protocol does not offer such protection for DH ciphersuites).
2226                          * However, buggy clients exist that send the negotiated protocol
2227                          * version instead if the server does not support the requested
2228                          * protocol version.
2229                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2230                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2231                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2232                                 {
2233                                 al=SSL_AD_DECODE_ERROR;
2234                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2235
2236                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2237                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2238                                  * number check as a "bad version oracle" -- an alert would
2239                                  * reveal that the plaintext corresponding to some ciphertext
2240                                  * made up by the adversary is properly formatted except
2241                                  * that the version number is wrong.  To avoid such attacks,
2242                                  * we should treat this just like any other decryption error. */
2243                                 }
2244                         }
2245
2246                 if (al != -1)
2247                         {
2248                         /* Some decryption failure -- use random value instead as countermeasure
2249                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2250                          * (see RFC 2246, section 7.4.7.1). */
2251                         ERR_clear_error();
2252                         i = SSL_MAX_MASTER_KEY_LENGTH;
2253                         p[0] = s->client_version >> 8;
2254                         p[1] = s->client_version & 0xff;
2255                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2256                                 goto err;
2257                         }
2258
2259                 s->session->master_key_length=
2260                         s->method->ssl3_enc->generate_master_secret(s,
2261                                 s->session->master_key,
2262                                 p,i);
2263                 OPENSSL_cleanse(p,i);
2264                 }
2265         else
2266 #endif
2267 #ifndef OPENSSL_NO_DH
2268                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2269                 {
2270                 int idx = -1;
2271                 EVP_PKEY *skey = NULL;
2272                 if (n)
2273                         n2s(p,i);
2274                 if (n && n != i+2)
2275                         {
2276                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2277                                 {
2278                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2279                                 goto err;
2280                                 }
2281                         else
2282                                 {
2283                                 p-=2;
2284                                 i=(int)n;
2285                                 }
2286                         }
2287                 if (alg_k & SSL_kDHr)
2288                         idx = SSL_PKEY_DH_RSA;
2289                 else if (alg_k & SSL_kDHd)
2290                         idx = SSL_PKEY_DH_DSA;
2291                 if (idx >= 0)
2292                         {
2293                         skey = s->cert->pkeys[idx].privatekey;
2294                         if ((skey == NULL) ||
2295                                 (skey->type != EVP_PKEY_DH) ||
2296                                 (skey->pkey.dh == NULL))
2297                                 {
2298                                 al=SSL_AD_HANDSHAKE_FAILURE;
2299                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2300                                 goto f_err;
2301                                 }
2302                         dh_srvr = skey->pkey.dh;
2303                         }
2304                 else if (s->s3->tmp.dh == NULL)
2305                         {
2306                         al=SSL_AD_HANDSHAKE_FAILURE;
2307                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2308                         goto f_err;
2309                         }
2310                 else
2311                         dh_srvr=s->s3->tmp.dh;
2312
2313                 if (n == 0L)
2314                         {
2315                         /* Get pubkey from cert */
2316                         EVP_PKEY *clkey=X509_get_pubkey(s->session->peer);
2317                         if (clkey)
2318                                 {
2319                                 if (EVP_PKEY_cmp_parameters(clkey, skey) == 1)
2320                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2321                                 }
2322                         if (dh_clnt == NULL)
2323                                 {
2324                                 al=SSL_AD_HANDSHAKE_FAILURE;
2325                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2326                                 goto f_err;
2327                                 }
2328                         EVP_PKEY_free(clkey);
2329                         pub = dh_clnt->pub_key;
2330                         }
2331                 else
2332                         pub=BN_bin2bn(p,i,NULL);
2333                 if (pub == NULL)
2334                         {
2335                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2336                         goto err;
2337                         }
2338
2339                 i=DH_compute_key(p,pub,dh_srvr);
2340
2341                 if (i <= 0)
2342                         {
2343                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2344                         BN_clear_free(pub);
2345                         goto err;
2346                         }
2347
2348                 DH_free(s->s3->tmp.dh);
2349                 s->s3->tmp.dh=NULL;
2350                 if (dh_clnt)
2351                         DH_free(dh_clnt);
2352                 else
2353                         BN_clear_free(pub);
2354                 pub=NULL;
2355                 s->session->master_key_length=
2356                         s->method->ssl3_enc->generate_master_secret(s,
2357                                 s->session->master_key,p,i);
2358                 OPENSSL_cleanse(p,i);
2359                 if (dh_clnt)
2360                         return 2;
2361                 }
2362         else
2363 #endif
2364 #ifndef OPENSSL_NO_KRB5
2365         if (alg_k & SSL_kKRB5)
2366                 {
2367                 krb5_error_code         krb5rc;
2368                 krb5_data               enc_ticket;
2369                 krb5_data               authenticator;
2370                 krb5_data               enc_pms;
2371                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2372                 EVP_CIPHER_CTX          ciph_ctx;
2373                 const EVP_CIPHER        *enc = NULL;
2374                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2375                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2376                                                + EVP_MAX_BLOCK_LENGTH];
2377                 int                  padl, outl;
2378                 krb5_timestamp          authtime = 0;
2379                 krb5_ticket_times       ttimes;
2380
2381                 EVP_CIPHER_CTX_init(&ciph_ctx);
2382
2383                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2384
2385                 n2s(p,i);
2386                 enc_ticket.length = i;
2387
2388                 if (n < (long)(enc_ticket.length + 6))
2389                         {
2390                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2391                                 SSL_R_DATA_LENGTH_TOO_LONG);
2392                         goto err;
2393                         }
2394
2395                 enc_ticket.data = (char *)p;
2396                 p+=enc_ticket.length;
2397
2398                 n2s(p,i);
2399                 authenticator.length = i;
2400
2401                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2402                         {
2403                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2404                                 SSL_R_DATA_LENGTH_TOO_LONG);
2405                         goto err;
2406                         }
2407
2408                 authenticator.data = (char *)p;
2409                 p+=authenticator.length;
2410
2411                 n2s(p,i);
2412                 enc_pms.length = i;
2413                 enc_pms.data = (char *)p;
2414                 p+=enc_pms.length;
2415
2416                 /* Note that the length is checked again below,
2417                 ** after decryption
2418                 */
2419                 if(enc_pms.length > sizeof pms)
2420                         {
2421                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2422                                SSL_R_DATA_LENGTH_TOO_LONG);
2423                         goto err;
2424                         }
2425
2426                 if (n != (long)(enc_ticket.length + authenticator.length +
2427                                                 enc_pms.length + 6))
2428                         {
2429                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2430                                 SSL_R_DATA_LENGTH_TOO_LONG);
2431                         goto err;
2432                         }
2433
2434                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2435                                         &kssl_err)) != 0)
2436                         {
2437 #ifdef KSSL_DEBUG
2438                         printf("kssl_sget_tkt rtn %d [%d]\n",
2439                                 krb5rc, kssl_err.reason);
2440                         if (kssl_err.text)
2441                                 printf("kssl_err text= %s\n", kssl_err.text);
2442 #endif  /* KSSL_DEBUG */
2443                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2444                                 kssl_err.reason);
2445                         goto err;
2446                         }
2447
2448                 /*  Note: no authenticator is not considered an error,
2449                 **  but will return authtime == 0.
2450                 */
2451                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2452                                         &authtime, &kssl_err)) != 0)
2453                         {
2454 #ifdef KSSL_DEBUG
2455                         printf("kssl_check_authent rtn %d [%d]\n",
2456                                 krb5rc, kssl_err.reason);
2457                         if (kssl_err.text)
2458                                 printf("kssl_err text= %s\n", kssl_err.text);
2459 #endif  /* KSSL_DEBUG */
2460                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2461                                 kssl_err.reason);
2462                         goto err;
2463                         }
2464
2465                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2466                         {
2467                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2468                         goto err;
2469                         }
2470
2471 #ifdef KSSL_DEBUG
2472                 kssl_ctx_show(kssl_ctx);
2473 #endif  /* KSSL_DEBUG */
2474
2475                 enc = kssl_map_enc(kssl_ctx->enctype);
2476                 if (enc == NULL)
2477                     goto err;
2478
2479                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2480
2481                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2482                         {
2483                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2484                                 SSL_R_DECRYPTION_FAILED);
2485                         goto err;
2486                         }
2487                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2488                                         (unsigned char *)enc_pms.data, enc_pms.length))
2489                         {
2490                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2491                                 SSL_R_DECRYPTION_FAILED);
2492                         goto err;
2493                         }
2494                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2495                         {
2496                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2497                                 SSL_R_DATA_LENGTH_TOO_LONG);
2498                         goto err;
2499                         }
2500                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2501                         {
2502                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2503                                 SSL_R_DECRYPTION_FAILED);
2504                         goto err;
2505                         }
2506                 outl += padl;
2507                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2508                         {
2509                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2510                                 SSL_R_DATA_LENGTH_TOO_LONG);
2511                         goto err;
2512                         }
2513                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2514                     {
2515                     /* The premaster secret must contain the same version number as the
2516                      * ClientHello to detect version rollback attacks (strangely, the
2517                      * protocol does not offer such protection for DH ciphersuites).
2518                      * However, buggy clients exist that send random bytes instead of
2519                      * the protocol version.
2520                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2521                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2522                      */
2523                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2524                         {
2525                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2526                                SSL_AD_DECODE_ERROR);
2527                         goto err;
2528                         }
2529                     }
2530
2531                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2532
2533                 s->session->master_key_length=
2534                         s->method->ssl3_enc->generate_master_secret(s,
2535                                 s->session->master_key, pms, outl);
2536
2537                 if (kssl_ctx->client_princ)
2538                         {
2539                         size_t len = strlen(kssl_ctx->client_princ);
2540                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2541                                 {
2542                                 s->session->krb5_client_princ_len = len;
2543                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2544                                 }
2545                         }
2546
2547
2548                 /*  Was doing kssl_ctx_free() here,
2549                 **  but it caused problems for apache.
2550                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2551                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2552                 */
2553                 }
2554         else
2555 #endif  /* OPENSSL_NO_KRB5 */
2556
2557 #ifndef OPENSSL_NO_ECDH
2558                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2559                 {
2560                 int ret = 1;
2561                 int field_size = 0;
2562                 const EC_KEY   *tkey;
2563                 const EC_GROUP *group;
2564                 const BIGNUM *priv_key;
2565
2566                 /* initialize structures for server's ECDH key pair */
2567                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2568                         {
2569                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2570                             ERR_R_MALLOC_FAILURE);
2571                         goto err;
2572                         }
2573
2574                 /* Let's get server private key and group information */
2575                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2576                         {
2577                         /* use the certificate */
2578                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2579                         }
2580                 else
2581                         {
2582                         /* use the ephermeral values we saved when
2583                          * generating the ServerKeyExchange msg.
2584                          */
2585                         tkey = s->s3->tmp.ecdh;
2586                         }
2587
2588                 group    = EC_KEY_get0_group(tkey);
2589                 priv_key = EC_KEY_get0_private_key(tkey);
2590
2591                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2592                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2593                         {
2594                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2595                                ERR_R_EC_LIB);
2596                         goto err;
2597                         }
2598
2599                 /* Let's get client's public key */
2600                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2601                         {
2602                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2603                             ERR_R_MALLOC_FAILURE);
2604                         goto err;
2605                         }
2606
2607                 if (n == 0L)
2608                         {
2609                         /* Client Publickey was in Client Certificate */
2610
2611                          if (alg_k & SSL_kEECDH)
2612                                  {
2613                                  al=SSL_AD_HANDSHAKE_FAILURE;
2614                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2615                                  goto f_err;
2616                                  }
2617                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2618                             == NULL) ||
2619                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2620                                 {
2621                                 /* XXX: For now, we do not support client
2622                                  * authentication using ECDH certificates
2623                                  * so this branch (n == 0L) of the code is
2624                                  * never executed. When that support is
2625                                  * added, we ought to ensure the key
2626                                  * received in the certificate is
2627                                  * authorized for key agreement.
2628                                  * ECDH_compute_key implicitly checks that
2629                                  * the two ECDH shares are for the same
2630                                  * group.
2631                                  */
2632                                 al=SSL_AD_HANDSHAKE_FAILURE;
2633                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2634                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2635                                 goto f_err;
2636                                 }
2637
2638                         if (EC_POINT_copy(clnt_ecpoint,
2639                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2640                                 {
2641                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2642                                         ERR_R_EC_LIB);
2643                                 goto err;
2644                                 }
2645                         ret = 2; /* Skip certificate verify processing */
2646                         }
2647                 else
2648                         {
2649                         /* Get client's public key from encoded point
2650                          * in the ClientKeyExchange message.
2651                          */
2652                         if ((bn_ctx = BN_CTX_new()) == NULL)
2653                                 {
2654                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2655                                     ERR_R_MALLOC_FAILURE);
2656                                 goto err;
2657                                 }
2658
2659                         /* Get encoded point length */
2660                         i = *p;
2661                         p += 1;
2662                         if (n != 1 + i)
2663                                 {
2664                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2665                                     ERR_R_EC_LIB);
2666                                 goto err;
2667                                 }
2668                         if (EC_POINT_oct2point(group,
2669                             clnt_ecpoint, p, i, bn_ctx) == 0)
2670                                 {
2671                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2672                                     ERR_R_EC_LIB);
2673                                 goto err;
2674                                 }
2675                         /* p is pointing to somewhere in the buffer
2676                          * currently, so set it to the start
2677                          */
2678                         p=(unsigned char *)s->init_buf->data;
2679                         }
2680
2681                 /* Compute the shared pre-master secret */
2682                 field_size = EC_GROUP_get_degree(group);
2683                 if (field_size <= 0)
2684                         {
2685                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2686                                ERR_R_ECDH_LIB);
2687                         goto err;
2688                         }
2689                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2690                 if (i <= 0)
2691                         {
2692                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2693                             ERR_R_ECDH_LIB);
2694                         goto err;
2695                         }
2696
2697                 EVP_PKEY_free(clnt_pub_pkey);
2698                 EC_POINT_free(clnt_ecpoint);
2699                 EC_KEY_free(srvr_ecdh);
2700                 BN_CTX_free(bn_ctx);
2701                 EC_KEY_free(s->s3->tmp.ecdh);
2702                 s->s3->tmp.ecdh = NULL;
2703
2704                 /* Compute the master secret */
2705                 s->session->master_key_length = s->method->ssl3_enc-> \
2706                     generate_master_secret(s, s->session->master_key, p, i);
2707
2708                 OPENSSL_cleanse(p, i);
2709                 return (ret);
2710                 }
2711         else
2712 #endif
2713 #ifndef OPENSSL_NO_PSK
2714                 if (alg_k & SSL_kPSK)
2715                         {
2716                         unsigned char *t = NULL;
2717                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2718                         unsigned int pre_ms_len = 0, psk_len = 0;
2719                         int psk_err = 1;
2720                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2721
2722                         al=SSL_AD_HANDSHAKE_FAILURE;
2723
2724                         n2s(p,i);
2725                         if (n != i+2)
2726                                 {
2727                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2728                                         SSL_R_LENGTH_MISMATCH);
2729                                 goto psk_err;
2730                                 }
2731                         if (i > PSK_MAX_IDENTITY_LEN)
2732                                 {
2733                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2734                                         SSL_R_DATA_LENGTH_TOO_LONG);
2735                                 goto psk_err;
2736                                 }
2737                         if (s->psk_server_callback == NULL)
2738                                 {
2739                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2740                                        SSL_R_PSK_NO_SERVER_CB);
2741                                 goto psk_err;
2742                                 }
2743
2744                         /* Create guaranteed NULL-terminated identity
2745                          * string for the callback */
2746                         memcpy(tmp_id, p, i);
2747                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2748                         psk_len = s->psk_server_callback(s, tmp_id,
2749                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2750                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2751
2752                         if (psk_len > PSK_MAX_PSK_LEN)
2753                                 {
2754                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2755                                         ERR_R_INTERNAL_ERROR);
2756                                 goto psk_err;
2757                                 }
2758                         else if (psk_len == 0)
2759                                 {
2760                                 /* PSK related to the given identity not found */
2761                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2762                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2763                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2764                                 goto psk_err;
2765                                 }
2766
2767                         /* create PSK pre_master_secret */
2768                         pre_ms_len=2+psk_len+2+psk_len;
2769                         t = psk_or_pre_ms;
2770                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2771                         s2n(psk_len, t);
2772                         memset(t, 0, psk_len);
2773                         t+=psk_len;
2774                         s2n(psk_len, t);
2775
2776                         if (s->session->psk_identity != NULL)
2777                                 OPENSSL_free(s->session->psk_identity);
2778                         s->session->psk_identity = BUF_strdup((char *)p);
2779                         if (s->session->psk_identity == NULL)
2780                                 {
2781                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2782                                         ERR_R_MALLOC_FAILURE);
2783                                 goto psk_err;
2784                                 }
2785
2786                         if (s->session->psk_identity_hint != NULL)
2787                                 OPENSSL_free(s->session->psk_identity_hint);
2788                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2789                         if (s->ctx->psk_identity_hint != NULL &&
2790                                 s->session->psk_identity_hint == NULL)
2791                                 {
2792                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2793                                         ERR_R_MALLOC_FAILURE);
2794                                 goto psk_err;
2795                                 }
2796
2797                         s->session->master_key_length=
2798                                 s->method->ssl3_enc->generate_master_secret(s,
2799                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2800                         psk_err = 0;
2801                 psk_err:
2802                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2803                         if (psk_err != 0)
2804                                 goto f_err;
2805                         }
2806                 else
2807 #endif
2808 #ifndef OPENSSL_NO_SRP
2809                 if (alg_k & SSL_kSRP)
2810                         {
2811                         int param_len;
2812
2813                         n2s(p,i);
2814                         param_len=i+2;
2815                         if (param_len > n)
2816                                 {
2817                                 al=SSL_AD_DECODE_ERROR;
2818                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2819                                 goto f_err;
2820                                 }
2821                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2822                                 {
2823                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2824                                 goto err;
2825                                 }
2826                         if (s->session->srp_username != NULL)
2827                                 OPENSSL_free(s->session->srp_username);
2828                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2829                         if (s->session->srp_username == NULL)
2830                                 {
2831                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2832                                         ERR_R_MALLOC_FAILURE);
2833                                 goto err;
2834                                 }
2835
2836                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2837                                 {
2838                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2839                                 goto err;
2840                                 }
2841
2842                         p+=i;
2843                         }
2844                 else
2845 #endif  /* OPENSSL_NO_SRP */
2846                 if (alg_k & SSL_kGOST)
2847                         {
2848                         int ret = 0;
2849                         EVP_PKEY_CTX *pkey_ctx;
2850                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2851                         unsigned char premaster_secret[32], *start;
2852                         size_t outlen=32, inlen;
2853                         unsigned long alg_a;
2854
2855                         /* Get our certificate private key*/
2856                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2857                         if (alg_a & SSL_aGOST94)
2858                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2859                         else if (alg_a & SSL_aGOST01)
2860                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2861
2862                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2863                         EVP_PKEY_decrypt_init(pkey_ctx);
2864                         /* If client certificate is present and is of the same type, maybe
2865                          * use it for key exchange.  Don't mind errors from
2866                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2867                          * a client certificate for authorization only. */
2868                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2869                         if (client_pub_pkey)
2870                                 {
2871                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2872                                         ERR_clear_error();
2873                                 }
2874                         /* Decrypt session key */
2875                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED)))
2876                                 {
2877                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2878                                 goto gerr;
2879                                 }
2880                         if (p[1] == 0x81)
2881                                 {
2882                                 start = p+3;
2883                                 inlen = p[2];
2884                                 }
2885                         else if (p[1] < 0x80)
2886                                 {
2887                                 start = p+2;
2888                                 inlen = p[1];
2889                                 }
2890                         else
2891                                 {
2892                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2893                                 goto gerr;
2894                                 }
2895                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
2896
2897                                 {
2898                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2899                                 goto gerr;
2900                                 }
2901                         /* Generate master secret */
2902                         s->session->master_key_length=
2903                                 s->method->ssl3_enc->generate_master_secret(s,
2904                                         s->session->master_key,premaster_secret,32);
2905                         /* Check if pubkey from client certificate was used */
2906                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2907                                 ret = 2;
2908                         else
2909                                 ret = 1;
2910                 gerr:
2911                         EVP_PKEY_free(client_pub_pkey);
2912                         EVP_PKEY_CTX_free(pkey_ctx);
2913                         if (ret)
2914                                 return ret;
2915                         else
2916                                 goto err;
2917                         }
2918                 else
2919                 {
2920                 al=SSL_AD_HANDSHAKE_FAILURE;
2921                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2922                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2923                 goto f_err;
2924                 }
2925
2926         return(1);
2927 f_err:
2928         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2929 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
2930 err:
2931 #endif
2932 #ifndef OPENSSL_NO_ECDH
2933         EVP_PKEY_free(clnt_pub_pkey);
2934         EC_POINT_free(clnt_ecpoint);
2935         if (srvr_ecdh != NULL)
2936                 EC_KEY_free(srvr_ecdh);
2937         BN_CTX_free(bn_ctx);
2938 #endif
2939         return(-1);
2940         }
2941
2942 int ssl3_get_cert_verify(SSL *s)
2943         {
2944         EVP_PKEY *pkey=NULL;
2945         unsigned char *p;
2946         int al,ok,ret=0;
2947         long n;
2948         int type=0,i,j;
2949         X509 *peer;
2950         const EVP_MD *md = NULL;
2951         EVP_MD_CTX mctx;
2952         EVP_MD_CTX_init(&mctx);
2953
2954         n=s->method->ssl_get_message(s,
2955                 SSL3_ST_SR_CERT_VRFY_A,
2956                 SSL3_ST_SR_CERT_VRFY_B,
2957                 -1,
2958                 516, /* Enough for 4096 bit RSA key with TLS v1.2 */
2959                 &ok);
2960
2961         if (!ok) return((int)n);
2962
2963         if (s->session->peer != NULL)
2964                 {
2965                 peer=s->session->peer;
2966                 pkey=X509_get_pubkey(peer);
2967                 type=X509_certificate_type(peer,pkey);
2968                 }
2969         else
2970                 {
2971                 peer=NULL;
2972                 pkey=NULL;
2973                 }
2974
2975         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2976                 {
2977                 s->s3->tmp.reuse_message=1;
2978                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2979                         {
2980                         al=SSL_AD_UNEXPECTED_MESSAGE;
2981                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2982                         goto f_err;
2983                         }
2984                 ret=1;
2985                 goto end;
2986                 }
2987
2988         if (peer == NULL)
2989                 {
2990                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2991                 al=SSL_AD_UNEXPECTED_MESSAGE;
2992                 goto f_err;
2993                 }
2994
2995         if (!(type & EVP_PKT_SIGN))
2996                 {
2997                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2998                 al=SSL_AD_ILLEGAL_PARAMETER;
2999                 goto f_err;
3000                 }
3001
3002         if (s->s3->change_cipher_spec)
3003                 {
3004                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
3005                 al=SSL_AD_UNEXPECTED_MESSAGE;
3006                 goto f_err;
3007                 }
3008
3009         /* we now have a signature that we need to verify */
3010         p=(unsigned char *)s->init_msg;
3011         /* Check for broken implementations of GOST ciphersuites */
3012         /* If key is GOST and n is exactly 64, it is bare
3013          * signature without length field */
3014         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
3015                 pkey->type == NID_id_GostR3410_2001) )
3016                 {
3017                 i=64;
3018                 }
3019         else
3020                 {
3021                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
3022                         {
3023                         int sigalg = tls12_get_sigid(pkey);
3024                         /* Should never happen */
3025                         if (sigalg == -1)
3026                                 {
3027                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3028                                 al=SSL_AD_INTERNAL_ERROR;
3029                                 goto f_err;
3030                                 }
3031                         /* Check key type is consistent with signature */
3032                         if (sigalg != (int)p[1])
3033                                 {
3034                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_TYPE);
3035                                 al=SSL_AD_DECODE_ERROR;
3036                                 goto f_err;
3037                                 }
3038                         md = tls12_get_hash(p[0]);
3039                         if (md == NULL)
3040                                 {
3041                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_UNKNOWN_DIGEST);
3042                                 al=SSL_AD_DECODE_ERROR;
3043                                 goto f_err;
3044                                 }
3045 #ifdef SSL_DEBUG
3046 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3047 #endif
3048                         p += 2;
3049                         n -= 2;
3050                         }
3051                 n2s(p,i);
3052                 n-=2;
3053                 if (i > n)
3054                         {
3055                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3056                         al=SSL_AD_DECODE_ERROR;
3057                         goto f_err;
3058                         }
3059         }
3060         j=EVP_PKEY_size(pkey);
3061         if ((i > j) || (n > j) || (n <= 0))
3062                 {
3063                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3064                 al=SSL_AD_DECODE_ERROR;
3065                 goto f_err;
3066                 }
3067
3068         if (TLS1_get_version(s) >= TLS1_2_VERSION)
3069                 {
3070                 long hdatalen = 0;
3071                 void *hdata;
3072                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3073                 if (hdatalen <= 0)
3074                         {
3075                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3076                         al=SSL_AD_INTERNAL_ERROR;
3077                         goto f_err;
3078                         }
3079 #ifdef SSL_DEBUG
3080                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3081                                                         EVP_MD_name(md));
3082 #endif
3083                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3084                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3085                         {
3086                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3087                         al=SSL_AD_INTERNAL_ERROR;
3088                         goto f_err;
3089                         }
3090
3091                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3092                         {
3093                         al=SSL_AD_DECRYPT_ERROR;
3094                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3095                         goto f_err;
3096                         }
3097                 }
3098         else
3099 #ifndef OPENSSL_NO_RSA
3100         if (pkey->type == EVP_PKEY_RSA)
3101                 {
3102                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3103                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
3104                                                         pkey->pkey.rsa);
3105                 if (i < 0)
3106                         {
3107                         al=SSL_AD_DECRYPT_ERROR;
3108                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3109                         goto f_err;
3110                         }
3111                 if (i == 0)
3112                         {
3113                         al=SSL_AD_DECRYPT_ERROR;
3114                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3115                         goto f_err;
3116                         }
3117                 }
3118         else
3119 #endif
3120 #ifndef OPENSSL_NO_DSA
3121                 if (pkey->type == EVP_PKEY_DSA)
3122                 {
3123                 j=DSA_verify(pkey->save_type,
3124                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3125                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3126                 if (j <= 0)
3127                         {
3128                         /* bad signature */
3129                         al=SSL_AD_DECRYPT_ERROR;
3130                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3131                         goto f_err;
3132                         }
3133                 }
3134         else
3135 #endif
3136 #ifndef OPENSSL_NO_ECDSA
3137                 if (pkey->type == EVP_PKEY_EC)
3138                 {
3139                 j=ECDSA_verify(pkey->save_type,
3140                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3141                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3142                 if (j <= 0)
3143                         {
3144                         /* bad signature */
3145                         al=SSL_AD_DECRYPT_ERROR;
3146                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3147                             SSL_R_BAD_ECDSA_SIGNATURE);
3148                         goto f_err;
3149                         }
3150                 }
3151         else
3152 #endif
3153         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3154                 {   unsigned char signature[64];
3155                         int idx;
3156                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3157                         EVP_PKEY_verify_init(pctx);
3158                         if (i!=64) {
3159                                 fprintf(stderr,"GOST signature length is %d",i);
3160                         }
3161                         for (idx=0;idx<64;idx++) {
3162                                 signature[63-idx]=p[idx];
3163                         }
3164                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3165                         EVP_PKEY_CTX_free(pctx);
3166                         if (j<=0)
3167                                 {
3168                                 al=SSL_AD_DECRYPT_ERROR;
3169                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3170                                         SSL_R_BAD_ECDSA_SIGNATURE);
3171                                 goto f_err;
3172                                 }
3173                 }
3174         else
3175                 {
3176                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3177                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3178                 goto f_err;
3179                 }
3180
3181
3182         ret=1;
3183         if (0)
3184                 {
3185 f_err:
3186                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3187                 }
3188 end:
3189         if (s->s3->handshake_buffer)
3190                 {
3191                 BIO_free(s->s3->handshake_buffer);
3192                 s->s3->handshake_buffer = NULL;
3193                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3194                 }
3195         EVP_MD_CTX_cleanup(&mctx);
3196         EVP_PKEY_free(pkey);
3197         return(ret);
3198         }
3199
3200 int ssl3_get_client_certificate(SSL *s)
3201         {
3202         int i,ok,al,ret= -1;
3203         X509 *x=NULL;
3204         unsigned long l,nc,llen,n;
3205         const unsigned char *p,*q;
3206         unsigned char *d;
3207         STACK_OF(X509) *sk=NULL;
3208
3209         n=s->method->ssl_get_message(s,
3210                 SSL3_ST_SR_CERT_A,
3211                 SSL3_ST_SR_CERT_B,
3212                 -1,
3213                 s->max_cert_list,
3214                 &ok);
3215
3216         if (!ok) return((int)n);
3217
3218         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3219                 {
3220                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3221                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3222                         {
3223                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3224                         al=SSL_AD_HANDSHAKE_FAILURE;
3225                         goto f_err;
3226                         }
3227                 /* If tls asked for a client cert, the client must return a 0 list */
3228                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3229                         {
3230                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3231                         al=SSL_AD_UNEXPECTED_MESSAGE;
3232                         goto f_err;
3233                         }
3234                 s->s3->tmp.reuse_message=1;
3235                 return(1);
3236                 }
3237
3238         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3239                 {
3240                 al=SSL_AD_UNEXPECTED_MESSAGE;
3241                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3242                 goto f_err;
3243                 }
3244         p=d=(unsigned char *)s->init_msg;
3245
3246         if ((sk=sk_X509_new_null()) == NULL)
3247                 {
3248                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3249                 goto err;
3250                 }
3251
3252         n2l3(p,llen);
3253         if (llen+3 != n)
3254                 {
3255                 al=SSL_AD_DECODE_ERROR;
3256                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3257                 goto f_err;
3258                 }
3259         for (nc=0; nc<llen; )
3260                 {
3261                 n2l3(p,l);
3262                 if ((l+nc+3) > llen)
3263                         {
3264                         al=SSL_AD_DECODE_ERROR;
3265                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3266                         goto f_err;
3267                         }
3268
3269                 q=p;
3270                 x=d2i_X509(NULL,&p,l);
3271                 if (x == NULL)
3272                         {
3273                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3274                         goto err;
3275                         }
3276                 if (p != (q+l))
3277                         {
3278                         al=SSL_AD_DECODE_ERROR;
3279                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3280                         goto f_err;
3281                         }
3282                 if (!sk_X509_push(sk,x))
3283                         {
3284                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3285                         goto err;
3286                         }
3287                 x=NULL;
3288                 nc+=l+3;
3289                 }
3290
3291         if (sk_X509_num(sk) <= 0)
3292                 {
3293                 /* TLS does not mind 0 certs returned */
3294                 if (s->version == SSL3_VERSION)
3295                         {
3296                         al=SSL_AD_HANDSHAKE_FAILURE;
3297                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3298                         goto f_err;
3299                         }
3300                 /* Fail for TLS only if we required a certificate */
3301                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3302                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3303                         {
3304                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3305                         al=SSL_AD_HANDSHAKE_FAILURE;
3306                         goto f_err;
3307                         }
3308                 /* No client certificate so digest cached records */
3309                 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s))
3310                         {
3311                         al=SSL_AD_INTERNAL_ERROR;
3312                         goto f_err;
3313                         }
3314                 }
3315         else
3316                 {
3317                 i=ssl_verify_cert_chain(s,sk);
3318                 if (i <= 0)
3319                         {
3320                         al=ssl_verify_alarm_type(s->verify_result);
3321                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
3322                         goto f_err;
3323                         }
3324                 }
3325
3326         if (s->session->peer != NULL) /* This should not be needed */
3327                 X509_free(s->session->peer);
3328         s->session->peer=sk_X509_shift(sk);
3329         s->session->verify_result = s->verify_result;
3330
3331         /* With the current implementation, sess_cert will always be NULL
3332          * when we arrive here. */
3333         if (s->session->sess_cert == NULL)
3334                 {
3335                 s->session->sess_cert = ssl_sess_cert_new();
3336                 if (s->session->sess_cert == NULL)
3337                         {
3338                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3339                         goto err;
3340                         }
3341                 }
3342         if (s->session->sess_cert->cert_chain != NULL)
3343                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3344         s->session->sess_cert->cert_chain=sk;
3345         /* Inconsistency alert: cert_chain does *not* include the
3346          * peer's own certificate, while we do include it in s3_clnt.c */
3347
3348         sk=NULL;
3349
3350         ret=1;
3351         if (0)
3352                 {
3353 f_err:
3354                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3355                 }
3356 err:
3357         if (x != NULL) X509_free(x);
3358         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3359         return(ret);
3360         }
3361
3362 int ssl3_send_server_certificate(SSL *s)
3363         {
3364         unsigned long l;
3365         CERT_PKEY *cpk;
3366
3367         if (s->state == SSL3_ST_SW_CERT_A)
3368                 {
3369                 cpk=ssl_get_server_send_pkey(s);
3370                 if (cpk == NULL)
3371                         {
3372                         /* VRS: allow null cert if auth == KRB5 */
3373                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3374                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3375                                 {
3376                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3377                                 return(0);
3378                                 }
3379                         }
3380
3381                 l=ssl3_output_cert_chain(s,cpk);
3382                 s->state=SSL3_ST_SW_CERT_B;
3383                 s->init_num=(int)l;
3384                 s->init_off=0;
3385                 }
3386
3387         /* SSL3_ST_SW_CERT_B */
3388         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3389         }
3390
3391 #ifndef OPENSSL_NO_TLSEXT
3392 /* send a new session ticket (not necessarily for a new session) */
3393 int ssl3_send_newsession_ticket(SSL *s)
3394         {
3395         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3396                 {
3397                 unsigned char *p, *senc, *macstart;
3398                 const unsigned char *const_p;
3399                 int len, slen_full, slen;
3400                 SSL_SESSION *sess;
3401                 unsigned int hlen;
3402                 EVP_CIPHER_CTX ctx;
3403                 HMAC_CTX hctx;
3404                 SSL_CTX *tctx = s->initial_ctx;
3405                 unsigned char iv[EVP_MAX_IV_LENGTH];
3406                 unsigned char key_name[16];
3407
3408                 /* get session encoding length */
3409                 slen_full = i2d_SSL_SESSION(s->session, NULL);
3410                 /* Some length values are 16 bits, so forget it if session is
3411                  * too long
3412                  */
3413                 if (slen_full > 0xFF00)
3414                         return -1;
3415                 senc = OPENSSL_malloc(slen_full);
3416                 if (!senc)
3417                         return -1;
3418                 p = senc;
3419                 i2d_SSL_SESSION(s->session, &p);
3420
3421                 /* create a fresh copy (not shared with other threads) to clean up */
3422                 const_p = senc;
3423                 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3424                 if (sess == NULL)
3425                         {
3426                         OPENSSL_free(senc);
3427                         return -1;
3428                         }
3429                 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
3430
3431                 slen = i2d_SSL_SESSION(sess, NULL);
3432                 if (slen > slen_full) /* shouldn't ever happen */
3433                         {
3434                         OPENSSL_free(senc);
3435                         return -1;
3436                         }
3437                 p = senc;
3438                 i2d_SSL_SESSION(sess, &p);
3439                 SSL_SESSION_free(sess);
3440
3441                 /* Grow buffer if need be: the length calculation is as
3442                  * follows 1 (size of message name) + 3 (message length
3443                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
3444                  * 16 (key name) + max_iv_len (iv length) +
3445                  * session_length + max_enc_block_size (max encrypted session
3446                  * length) + max_md_size (HMAC).
3447                  */
3448                 if (!BUF_MEM_grow(s->init_buf,
3449                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
3450                         EVP_MAX_MD_SIZE + slen))
3451                         return -1;
3452
3453                 p=(unsigned char *)s->init_buf->data;
3454                 /* do the header */
3455                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
3456                 /* Skip message length for now */
3457                 p += 3;
3458                 EVP_CIPHER_CTX_init(&ctx);
3459                 HMAC_CTX_init(&hctx);
3460                 /* Initialize HMAC and cipher contexts. If callback present
3461                  * it does all the work otherwise use generated values
3462                  * from parent ctx.
3463                  */
3464                 if (tctx->tlsext_ticket_key_cb)
3465                         {
3466                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3467                                                          &hctx, 1) < 0)
3468                                 {
3469                                 OPENSSL_free(senc);
3470                                 return -1;
3471                                 }
3472                         }
3473                 else
3474                         {
3475                         RAND_pseudo_bytes(iv, 16);
3476                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3477                                         tctx->tlsext_tick_aes_key, iv);
3478                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3479                                         tlsext_tick_md(), NULL);
3480                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3481                         }
3482
3483                 /* Ticket lifetime hint (advisory only):
3484                  * We leave this unspecified for resumed session (for simplicity),
3485                  * and guess that tickets for new sessions will live as long
3486                  * as their sessions. */
3487                 l2n(s->hit ? 0 : s->session->timeout, p);
3488
3489                 /* Skip ticket length for now */
3490                 p += 2;
3491                 /* Output key name */
3492                 macstart = p;
3493                 memcpy(p, key_name, 16);
3494                 p += 16;
3495                 /* output IV */
3496                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3497                 p += EVP_CIPHER_CTX_iv_length(&ctx);
3498                 /* Encrypt session data */
3499                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3500                 p += len;
3501                 EVP_EncryptFinal(&ctx, p, &len);
3502                 p += len;
3503                 EVP_CIPHER_CTX_cleanup(&ctx);
3504
3505                 HMAC_Update(&hctx, macstart, p - macstart);
3506                 HMAC_Final(&hctx, p, &hlen);
3507                 HMAC_CTX_cleanup(&hctx);
3508
3509                 p += hlen;
3510                 /* Now write out lengths: p points to end of data written */
3511                 /* Total length */
3512                 len = p - (unsigned char *)s->init_buf->data;
3513                 p=(unsigned char *)s->init_buf->data + 1;
3514                 l2n3(len - 4, p); /* Message length */
3515                 p += 4;
3516                 s2n(len - 10, p);  /* Ticket length */
3517
3518                 /* number of bytes to write */
3519                 s->init_num= len;
3520                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3521                 s->init_off=0;
3522                 OPENSSL_free(senc);
3523                 }
3524
3525         /* SSL3_ST_SW_SESSION_TICKET_B */
3526         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3527         }
3528
3529 int ssl3_send_cert_status(SSL *s)
3530         {
3531         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3532                 {
3533                 unsigned char *p;
3534                 /* Grow buffer if need be: the length calculation is as
3535                  * follows 1 (message type) + 3 (message length) +
3536                  * 1 (ocsp response type) + 3 (ocsp response length)
3537                  * + (ocsp response)
3538                  */
3539                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3540                         return -1;
3541
3542                 p=(unsigned char *)s->init_buf->data;
3543
3544                 /* do the header */
3545                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3546                 /* message length */
3547                 l2n3(s->tlsext_ocsp_resplen + 4, p);
3548                 /* status type */
3549                 *(p++)= s->tlsext_status_type;
3550                 /* length of OCSP response */
3551                 l2n3(s->tlsext_ocsp_resplen, p);
3552                 /* actual response */
3553                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3554                 /* number of bytes to write */
3555                 s->init_num = 8 + s->tlsext_ocsp_resplen;
3556                 s->state=SSL3_ST_SW_CERT_STATUS_B;
3557                 s->init_off = 0;
3558                 }
3559
3560         /* SSL3_ST_SW_CERT_STATUS_B */
3561         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3562         }
3563
3564 # ifndef OPENSSL_NO_NPN
3565 /* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It
3566  * sets the next_proto member in s if found */
3567 int ssl3_get_next_proto(SSL *s)
3568         {
3569         int ok;
3570         int proto_len, padding_len;
3571         long n;
3572         const unsigned char *p;
3573
3574         /* Clients cannot send a NextProtocol message if we didn't see the
3575          * extension in their ClientHello */
3576         if (!s->s3->next_proto_neg_seen)
3577                 {
3578                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION);
3579                 return -1;
3580                 }
3581
3582         n=s->method->ssl_get_message(s,
3583                 SSL3_ST_SR_NEXT_PROTO_A,
3584                 SSL3_ST_SR_NEXT_PROTO_B,
3585                 SSL3_MT_NEXT_PROTO,
3586                 514,  /* See the payload format below */
3587                 &ok);
3588
3589         if (!ok)
3590                 return((int)n);
3591
3592         /* s->state doesn't reflect whether ChangeCipherSpec has been received
3593          * in this handshake, but s->s3->change_cipher_spec does (will be reset
3594          * by ssl3_get_finished). */
3595         if (!s->s3->change_cipher_spec)
3596                 {
3597                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS);
3598                 return -1;
3599                 }
3600
3601         if (n < 2)
3602                 return 0;  /* The body must be > 1 bytes long */
3603
3604         p=(unsigned char *)s->init_msg;
3605
3606         /* The payload looks like:
3607          *   uint8 proto_len;
3608          *   uint8 proto[proto_len];
3609          *   uint8 padding_len;
3610          *   uint8 padding[padding_len];
3611          */
3612         proto_len = p[0];
3613         if (proto_len + 2 > s->init_num)
3614                 return 0;
3615         padding_len = p[proto_len + 1];
3616         if (proto_len + padding_len + 2 != s->init_num)
3617                 return 0;
3618
3619         s->next_proto_negotiated = OPENSSL_malloc(proto_len);
3620         if (!s->next_proto_negotiated)
3621                 {
3622                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,ERR_R_MALLOC_FAILURE);
3623                 return 0;
3624                 }
3625         memcpy(s->next_proto_negotiated, p + 1, proto_len);
3626         s->next_proto_negotiated_len = proto_len;
3627
3628         return 1;
3629         }
3630 # endif
3631 #endif