ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124 /* ====================================================================
 125  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 133  * support (see RFC 4279) to OpenSSL.
 134  *
 135  * No patent licenses or other rights except those expressly stated in
 136  * the OpenSSL open source license shall be deemed granted or received
 137  * expressly, by implication, estoppel, or otherwise.
 138  *
 139  * No assurances are provided by Nokia that the Contribution does not
 140  * infringe the patent or other intellectual property rights of any third
 141  * party or that the license provides you with all the necessary rights
 142  * to make use of the Contribution.
 143  *
 144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 148  * OTHERWISE.
 149  */
 150
 151 #define REUSE_CIPHER_BUG
 152 #define NETSCAPE_HANG_BUG
 153
 154 #include <stdio.h>
 155 #include <openssl/crypto.h>
 156 #include "ssl_locl.h"
 157 #include "kssl_lcl.h"
 158 #include <openssl/buffer.h>
 159 #include <openssl/rand.h>
 160 #include <openssl/objects.h>
 161 #include <openssl/evp.h>
 162 #include <openssl/hmac.h>
 163 #include <openssl/x509.h>
 164 #ifndef OPENSSL_NO_DH
 165 #include <openssl/dh.h>
 166 #endif
 167 #include <openssl/bn.h>
 168 #ifndef OPENSSL_NO_KRB5
 169 #include <openssl/krb5_asn.h>
 170 #endif
 171 #include <openssl/md5.h>
 172
 173 static const SSL_METHOD *ssl3_get_server_method(int ver);
 174
 175 static const SSL_METHOD *ssl3_get_server_method(int ver)
 176         {
 177         if (ver == SSL3_VERSION)
 178                 return(SSLv3_server_method());
 179         else
 180                 return(NULL);
 181         }
 182
 183 #ifndef OPENSSL_NO_SRP
 184 static int ssl_check_srp_ext_ClientHello(SSL *s,int *al)
 185         {
 186         int ret = SSL_ERROR_NONE;
 187
 188         *al = SSL_AD_UNRECOGNIZED_NAME;
 189
 190         if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
 191             (s->srp_ctx.TLS_ext_srp_username_callback != NULL))
 192                 {
 193                 if(s->srp_ctx.login == NULL)
 194                         {
 195                         /* RFC 5054 says SHOULD reject,
 196                            we do so if There is no srp login name */
 197                         ret = SSL3_AL_FATAL;
 198                         *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
 199                         }
 200                 else
 201                         {
 202                         ret = SSL_srp_server_param_with_username(s,al);
 203                         }
 204                 }
 205         return ret;
 206         }
 207 #endif
 208
 209 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
 210                         ssl3_accept,
 211                         ssl_undefined_function,
 212                         ssl3_get_server_method)
 213
 214 int ssl3_accept(SSL *s)
 215         {
 216         BUF_MEM *buf;
 217         unsigned long alg_k,Time=(unsigned long)time(NULL);
 218         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 219         int ret= -1;
 220         int new_state,state,skip=0;
 221
 222         RAND_add(&Time,sizeof(Time),0);
 223         ERR_clear_error();
 224         clear_sys_error();
 225
 226         if (s->info_callback != NULL)
 227                 cb=s->info_callback;
 228         else if (s->ctx->info_callback != NULL)
 229                 cb=s->ctx->info_callback;
 230
 231         /* init things to blank */
 232         s->in_handshake++;
 233         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 234
 235         if (s->cert == NULL)
 236                 {
 237                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 238                 return(-1);
 239                 }
 240
 241 #ifndef OPENSSL_NO_HEARTBEATS
 242         /* If we're awaiting a HeartbeatResponse, pretend we
 243          * already got and don't await it anymore, because
 244          * Heartbeats don't make sense during handshakes anyway.
 245          */
 246         if (s->tlsext_hb_pending)
 247                 {
 248                 s->tlsext_hb_pending = 0;
 249                 s->tlsext_hb_seq++;
 250                 }
 251 #endif
 252
 253         for (;;)
 254                 {
 255                 state=s->state;
 256
 257                 switch (s->state)
 258                         {
 259                 case SSL_ST_RENEGOTIATE:
 260                         s->renegotiate=1;
 261                         /* s->state=SSL_ST_ACCEPT; */
 262
 263                 case SSL_ST_BEFORE:
 264                 case SSL_ST_ACCEPT:
 265                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 266                 case SSL_ST_OK|SSL_ST_ACCEPT:
 267
 268                         s->server=1;
 269                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 270
 271                         if ((s->version>>8) != 3)
 272                                 {
 273                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 274                                 return -1;
 275                                 }
 276                         s->type=SSL_ST_ACCEPT;
 277
 278                         if (s->init_buf == NULL)
 279                                 {
 280                                 if ((buf=BUF_MEM_new()) == NULL)
 281                                         {
 282                                         ret= -1;
 283                                         goto end;
 284                                         }
 285                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 286                                         {
 287                                         ret= -1;
 288                                         goto end;
 289                                         }
 290                                 s->init_buf=buf;
 291                                 }
 292
 293                         if (!ssl3_setup_buffers(s))
 294                                 {
 295                                 ret= -1;
 296                                 goto end;
 297                                 }
 298
 299                         s->init_num=0;
 300                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
 301                         s->s3->flags &= ~TLS1_FLAGS_SKIP_CERT_VERIFY;
 302
 303                         if (s->state != SSL_ST_RENEGOTIATE)
 304                                 {
 305                                 /* Ok, we now need to push on a buffering BIO so that
 306                                  * the output is sent in a way that TCP likes :-)
 307                                  */
 308                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 309
 310                                 ssl3_init_finished_mac(s);
 311                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 312                                 s->ctx->stats.sess_accept++;
 313                                 }
 314                         else if (!s->s3->send_connection_binding &&
 315                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
 316                                 {
 317                                 /* Server attempting to renegotiate with
 318                                  * client that doesn't support secure
 319                                  * renegotiation.
 320                                  */
 321                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
 322                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 323                                 ret = -1;
 324                                 goto end;
 325                                 }
 326                         else
 327                                 {
 328                                 /* s->state == SSL_ST_RENEGOTIATE,
 329                                  * we will just send a HelloRequest */
 330                                 s->ctx->stats.sess_accept_renegotiate++;
 331                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 332                                 }
 333                         break;
 334
 335                 case SSL3_ST_SW_HELLO_REQ_A:
 336                 case SSL3_ST_SW_HELLO_REQ_B:
 337
 338                         s->shutdown=0;
 339                         ret=ssl3_send_hello_request(s);
 340                         if (ret <= 0) goto end;
 341                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 342                         s->state=SSL3_ST_SW_FLUSH;
 343                         s->init_num=0;
 344
 345                         ssl3_init_finished_mac(s);
 346                         break;
 347
 348                 case SSL3_ST_SW_HELLO_REQ_C:
 349                         s->state=SSL_ST_OK;
 350                         break;
 351
 352                 case SSL3_ST_SR_CLNT_HELLO_A:
 353                 case SSL3_ST_SR_CLNT_HELLO_B:
 354                 case SSL3_ST_SR_CLNT_HELLO_C:
 355
 356                         if (s->rwstate != SSL_X509_LOOKUP)
 357                         {
 358                                 ret=ssl3_get_client_hello(s);
 359                                 if (ret <= 0) goto end;
 360                         }
 361 #ifndef OPENSSL_NO_SRP
 362                         {
 363                         int al;
 364                         if ((ret = ssl_check_srp_ext_ClientHello(s,&al))  < 0)
 365                                         {
 366                                         /* callback indicates firther work to be done */
 367                                         s->rwstate=SSL_X509_LOOKUP;
 368                                         goto end;
 369                                         }
 370                         if (ret != SSL_ERROR_NONE)
 371                                 {
 372                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 373                                 /* This is not really an error but the only means to
 374                                    for a client to detect whether srp is supported. */
 375                                    if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)
 376                                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);
 377                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
 378                                 ret= -1;
 379                                 goto end;
 380                                 }
 381                         }
 382 #endif
 383
 384                         s->renegotiate = 2;
 385                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 386                         s->init_num=0;
 387                         break;
 388
 389                 case SSL3_ST_SW_SRVR_HELLO_A:
 390                 case SSL3_ST_SW_SRVR_HELLO_B:
 391                         ret=ssl3_send_server_hello(s);
 392                         if (ret <= 0) goto end;
 393 #ifndef OPENSSL_NO_TLSEXT
 394                         if (s->hit)
 395                                 {
 396                                 if (s->tlsext_ticket_expected)
 397                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 398                                 else
 399                                         s->state=SSL3_ST_SW_CHANGE_A;
 400                                 }
 401 #else
 402                         if (s->hit)
 403                                         s->state=SSL3_ST_SW_CHANGE_A;
 404 #endif
 405                         else
 406                                 s->state=SSL3_ST_SW_CERT_A;
 407                         s->init_num=0;
 408                         break;
 409
 410                 case SSL3_ST_SW_CERT_A:
 411                 case SSL3_ST_SW_CERT_B:
 412                         /* Check if it is anon DH or anon ECDH, */
 413                         /* normal PSK or KRB5 or SRP */
 414                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
 415                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
 416                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
 417                                 {
 418                                 ret=ssl3_send_server_certificate(s);
 419                                 if (ret <= 0) goto end;
 420 #ifndef OPENSSL_NO_TLSEXT
 421                                 if (s->tlsext_status_expected)
 422                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 423                                 else
 424                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 425                                 }
 426                         else
 427                                 {
 428                                 skip = 1;
 429                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 430                                 }
 431 #else
 432                                 }
 433                         else
 434                                 skip=1;
 435
 436                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 437 #endif
 438                         s->init_num=0;
 439                         break;
 440
 441                 case SSL3_ST_SW_KEY_EXCH_A:
 442                 case SSL3_ST_SW_KEY_EXCH_B:
 443                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 444
 445                         /* clear this, it may get reset by
 446                          * send_server_key_exchange */
 447                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 448 #ifndef OPENSSL_NO_KRB5
 449                                 && !(alg_k & SSL_kKRB5)
 450 #endif /* OPENSSL_NO_KRB5 */
 451                                 )
 452                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 453                                  * even when forbidden by protocol specs
 454                                  * (handshake may fail as clients are not required to
 455                                  * be able to handle this) */
 456                                 s->s3->tmp.use_rsa_tmp=1;
 457                         else
 458                                 s->s3->tmp.use_rsa_tmp=0;
 459
 460
 461                         /* only send if a DH key exchange, fortezza or
 462                          * RSA but we have a sign only certificate
 463                          *
 464                          * PSK: may send PSK identity hints
 465                          *
 466                          * For ECC ciphersuites, we send a serverKeyExchange
 467                          * message only if the cipher suite is either
 468                          * ECDH-anon or ECDHE. In other cases, the
 469                          * server certificate contains the server's
 470                          * public key for key exchange.
 471                          */
 472                         if (s->s3->tmp.use_rsa_tmp
 473                         /* PSK: send ServerKeyExchange if PSK identity
 474                          * hint if provided */
 475 #ifndef OPENSSL_NO_PSK
 476                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 477 #endif
 478 #ifndef OPENSSL_NO_SRP
 479                             /* SRP: send ServerKeyExchange */
 480                             || (alg_k & SSL_kSRP)
 481 #endif
 482                             || (alg_k & SSL_kEDH)
 483                             || (alg_k & SSL_kEECDH)
 484                             || ((alg_k & SSL_kRSA)
 485                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 486                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 487                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 488                                         )
 489                                     )
 490                                 )
 491                             )
 492                                 {
 493                                 ret=ssl3_send_server_key_exchange(s);
 494                                 if (ret <= 0) goto end;
 495                                 }
 496                         else
 497                                 skip=1;
 498
 499                         s->state=SSL3_ST_SW_CERT_REQ_A;
 500                         s->init_num=0;
 501                         break;
 502
 503                 case SSL3_ST_SW_CERT_REQ_A:
 504                 case SSL3_ST_SW_CERT_REQ_B:
 505                         if (/* don't request cert unless asked for it: */
 506                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 507                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 508                                  * don't request cert during re-negotiation: */
 509                                 ((s->session->peer != NULL) &&
 510                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 511                                 /* never request cert in anonymous ciphersuites
 512                                  * (see section "Certificate request" in SSL 3 drafts
 513                                  * and in RFC 2246): */
 514                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 515                                  /* ... except when the application insists on verification
 516                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 517                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 518                                  /* never request cert in Kerberos ciphersuites */
 519                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
 520                                 /* With normal PSK Certificates and
 521                                  * Certificate Requests are omitted */
 522                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 523                                 {
 524                                 /* no cert request */
 525                                 skip=1;
 526                                 s->s3->tmp.cert_request=0;
 527                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 528                                 if (s->s3->handshake_buffer)
 529                                         if (!ssl3_digest_cached_records(s))
 530                                                 return -1;
 531                                 }
 532                         else
 533                                 {
 534                                 s->s3->tmp.cert_request=1;
 535                                 ret=ssl3_send_certificate_request(s);
 536                                 if (ret <= 0) goto end;
 537 #ifndef NETSCAPE_HANG_BUG
 538                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 539 #else
 540                                 s->state=SSL3_ST_SW_FLUSH;
 541                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 542 #endif
 543                                 s->init_num=0;
 544                                 }
 545                         break;
 546
 547                 case SSL3_ST_SW_SRVR_DONE_A:
 548                 case SSL3_ST_SW_SRVR_DONE_B:
 549                         ret=ssl3_send_server_done(s);
 550                         if (ret <= 0) goto end;
 551                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 552                         s->state=SSL3_ST_SW_FLUSH;
 553                         s->init_num=0;
 554                         break;
 555
 556                 case SSL3_ST_SW_FLUSH:
 557
 558                         /* This code originally checked to see if
 559                          * any data was pending using BIO_CTRL_INFO
 560                          * and then flushed. This caused problems
 561                          * as documented in PR#1939. The proposed
 562                          * fix doesn't completely resolve this issue
 563                          * as buggy implementations of BIO_CTRL_PENDING
 564                          * still exist. So instead we just flush
 565                          * unconditionally.
 566                          */
 567
 568                         s->rwstate=SSL_WRITING;
 569                         if (BIO_flush(s->wbio) <= 0)
 570                                 {
 571                                 ret= -1;
 572                                 goto end;
 573                                 }
 574                         s->rwstate=SSL_NOTHING;
 575
 576                         s->state=s->s3->tmp.next_state;
 577                         break;
 578
 579                 case SSL3_ST_SR_CERT_A:
 580                 case SSL3_ST_SR_CERT_B:
 581                         /* Check for second client hello (MS SGC) */
 582                         ret = ssl3_check_client_hello(s);
 583                         if (ret <= 0)
 584                                 goto end;
 585                         if (ret == 2)
 586                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 587                         else {
 588                                 if (s->s3->tmp.cert_request)
 589                                         {
 590                                         ret=ssl3_get_client_certificate(s);
 591                                         if (ret <= 0) goto end;
 592                                         }
 593                                 s->init_num=0;
 594                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 595                         }
 596                         break;
 597
 598                 case SSL3_ST_SR_KEY_EXCH_A:
 599                 case SSL3_ST_SR_KEY_EXCH_B:
 600                         ret=ssl3_get_client_key_exchange(s);
 601                         if (ret <= 0)
 602                                 goto end;
 603                         if (ret == 2)
 604                                 {
 605                                 /* For the ECDH ciphersuites when
 606                                  * the client sends its ECDH pub key in
 607                                  * a certificate, the CertificateVerify
 608                                  * message is not sent.
 609                                  * Also for GOST ciphersuites when
 610                                  * the client uses its key from the certificate
 611                                  * for key exchange.
 612                                  */
 613 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 614                                 s->state=SSL3_ST_SR_FINISHED_A;
 615 #else
 616                                 if (s->s3->next_proto_neg_seen)
 617                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
 618                                 else
 619                                         s->state=SSL3_ST_SR_FINISHED_A;
 620 #endif
 621                                 s->init_num = 0;
 622                                 }
 623                         else if (TLS1_get_version(s) >= TLS1_2_VERSION)
 624                                 {
 625                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 626                                 s->init_num=0;
 627                                 if (!s->session->peer)
 628                                         break;
 629                                 /* For TLS v1.2 freeze the handshake buffer
 630                                  * at this point and digest cached records.
 631                                  */
 632                                 if (!s->s3->handshake_buffer)
 633                                         {
 634                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
 635                                         return -1;
 636                                         }
 637                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
 638                                 if (!ssl3_digest_cached_records(s))
 639                                         return -1;
 640                                 }
 641                         else
 642                                 {
 643                                 int offset=0;
 644                                 int dgst_num;
 645
 646                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 647                                 s->init_num=0;
 648
 649                                 /* We need to get hashes here so if there is
 650                                  * a client cert, it can be verified
 651                                  * FIXME - digest processing for CertificateVerify
 652                                  * should be generalized. But it is next step
 653                                  */
 654                                 if (s->s3->handshake_buffer)
 655                                         if (!ssl3_digest_cached_records(s))
 656                                                 return -1;
 657                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
 658                                         if (s->s3->handshake_dgst[dgst_num])
 659                                                 {
 660                                                 int dgst_size;
 661
 662                                                 s->method->ssl3_enc->cert_verify_mac(s,EVP_MD_CTX_type(s->s3->handshake_dgst[dgst_num]),&(s->s3->tmp.cert_verify_md[offset]));
 663                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
 664                                                 if (dgst_size < 0)
 665                                                         {
 666                                                         ret = -1;
 667                                                         goto end;
 668                                                         }
 669                                                 offset+=dgst_size;
 670                                                 }
 671                                 }
 672                         break;
 673
 674                 case SSL3_ST_SR_CERT_VRFY_A:
 675                 case SSL3_ST_SR_CERT_VRFY_B:
 676
 677                         /* we should decide if we expected this one */
 678                         ret=ssl3_get_cert_verify(s);
 679                         if (ret <= 0) goto end;
 680
 681 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 682                         s->state=SSL3_ST_SR_FINISHED_A;
 683 #else
 684                         if (s->s3->next_proto_neg_seen)
 685                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
 686                         else
 687                                 s->state=SSL3_ST_SR_FINISHED_A;
 688 #endif
 689                         s->init_num=0;
 690                         break;
 691
 692 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 693                 case SSL3_ST_SR_NEXT_PROTO_A:
 694                 case SSL3_ST_SR_NEXT_PROTO_B:
 695                         ret=ssl3_get_next_proto(s);
 696                         if (ret <= 0) goto end;
 697                         s->init_num = 0;
 698                         s->state=SSL3_ST_SR_FINISHED_A;
 699                         break;
 700 #endif
 701
 702                 case SSL3_ST_SR_FINISHED_A:
 703                 case SSL3_ST_SR_FINISHED_B:
 704                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 705                                 SSL3_ST_SR_FINISHED_B);
 706                         if (ret <= 0) goto end;
 707                         if (s->hit)
 708                                 s->state=SSL_ST_OK;
 709 #ifndef OPENSSL_NO_TLSEXT
 710                         else if (s->tlsext_ticket_expected)
 711                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 712 #endif
 713                         else
 714                                 s->state=SSL3_ST_SW_CHANGE_A;
 715                         s->init_num=0;
 716                         break;
 717
 718 #ifndef OPENSSL_NO_TLSEXT
 719                 case SSL3_ST_SW_SESSION_TICKET_A:
 720                 case SSL3_ST_SW_SESSION_TICKET_B:
 721                         ret=ssl3_send_newsession_ticket(s);
 722                         if (ret <= 0) goto end;
 723                         s->state=SSL3_ST_SW_CHANGE_A;
 724                         s->init_num=0;
 725                         break;
 726
 727                 case SSL3_ST_SW_CERT_STATUS_A:
 728                 case SSL3_ST_SW_CERT_STATUS_B:
 729                         ret=ssl3_send_cert_status(s);
 730                         if (ret <= 0) goto end;
 731                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 732                         s->init_num=0;
 733                         break;
 734
 735 #endif
 736
 737                 case SSL3_ST_SW_CHANGE_A:
 738                 case SSL3_ST_SW_CHANGE_B:
 739
 740                         s->session->cipher=s->s3->tmp.new_cipher;
 741                         if (!s->method->ssl3_enc->setup_key_block(s))
 742                                 { ret= -1; goto end; }
 743
 744                         ret=ssl3_send_change_cipher_spec(s,
 745                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 746
 747                         if (ret <= 0) goto end;
 748                         s->state=SSL3_ST_SW_FINISHED_A;
 749                         s->init_num=0;
 750
 751                         if (!s->method->ssl3_enc->change_cipher_state(s,
 752                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 753                                 {
 754                                 ret= -1;
 755                                 goto end;
 756                                 }
 757
 758                         break;
 759
 760                 case SSL3_ST_SW_FINISHED_A:
 761                 case SSL3_ST_SW_FINISHED_B:
 762                         ret=ssl3_send_finished(s,
 763                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 764                                 s->method->ssl3_enc->server_finished_label,
 765                                 s->method->ssl3_enc->server_finished_label_len);
 766                         if (ret <= 0) goto end;
 767                         s->state=SSL3_ST_SW_FLUSH;
 768                         if (s->hit)
 769                                 {
 770 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 771                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 772 #else
 773                                 if (s->s3->next_proto_neg_seen)
 774                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
 775                                 else
 776                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 777 #endif
 778                                 }
 779                         else
 780                                 s->s3->tmp.next_state=SSL_ST_OK;
 781                         s->init_num=0;
 782                         break;
 783
 784                 case SSL_ST_OK:
 785                         /* clean a few things up */
 786                         ssl3_cleanup_key_block(s);
 787
 788                         BUF_MEM_free(s->init_buf);
 789                         s->init_buf=NULL;
 790
 791                         /* remove buffering on output */
 792                         ssl_free_wbio_buffer(s);
 793
 794                         s->init_num=0;
 795
 796                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
 797                                 {
 798                                 s->renegotiate=0;
 799                                 s->new_session=0;
 800
 801                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 802
 803                                 s->ctx->stats.sess_accept_good++;
 804                                 /* s->server=1; */
 805                                 s->handshake_func=ssl3_accept;
 806
 807                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 808                                 }
 809
 810                         ret = 1;
 811                         goto end;
 812                         /* break; */
 813
 814                 default:
 815                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 816                         ret= -1;
 817                         goto end;
 818                         /* break; */
 819                         }
 820
 821                 if (!s->s3->tmp.reuse_message && !skip)
 822                         {
 823                         if (s->debug)
 824                                 {
 825                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 826                                         goto end;
 827                                 }
 828
 829
 830                         if ((cb != NULL) && (s->state != state))
 831                                 {
 832                                 new_state=s->state;
 833                                 s->state=state;
 834                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 835                                 s->state=new_state;
 836                                 }
 837                         }
 838                 skip=0;
 839                 }
 840 end:
 841         /* BIO_flush(s->wbio); */
 842
 843         s->in_handshake--;
 844         if (cb != NULL)
 845                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 846         return(ret);
 847         }
 848
 849 int ssl3_send_hello_request(SSL *s)
 850         {
 851         unsigned char *p;
 852
 853         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 854                 {
 855                 p=(unsigned char *)s->init_buf->data;
 856                 *(p++)=SSL3_MT_HELLO_REQUEST;
 857                 *(p++)=0;
 858                 *(p++)=0;
 859                 *(p++)=0;
 860
 861                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 862                 /* number of bytes to write */
 863                 s->init_num=4;
 864                 s->init_off=0;
 865                 }
 866
 867         /* SSL3_ST_SW_HELLO_REQ_B */
 868         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 869         }
 870
 871 int ssl3_check_client_hello(SSL *s)
 872         {
 873         int ok;
 874         long n;
 875
 876         /* this function is called when we really expect a Certificate message,
 877          * so permit appropriate message length */
 878         n=s->method->ssl_get_message(s,
 879                 SSL3_ST_SR_CERT_A,
 880                 SSL3_ST_SR_CERT_B,
 881                 -1,
 882                 s->max_cert_list,
 883                 &ok);
 884         if (!ok) return((int)n);
 885         s->s3->tmp.reuse_message = 1;
 886         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 887                 {
 888                 /* We only allow the client to restart the handshake once per
 889                  * negotiation. */
 890                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
 891                         {
 892                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
 893                         return -1;
 894                         }
 895                 /* Throw away what we have done so far in the current handshake,
 896                  * which will now be aborted. (A full SSL_clear would be too much.) */
 897 #ifndef OPENSSL_NO_DH
 898                 if (s->s3->tmp.dh != NULL)
 899                         {
 900                         DH_free(s->s3->tmp.dh);
 901                         s->s3->tmp.dh = NULL;
 902                         }
 903 #endif
 904 #ifndef OPENSSL_NO_ECDH
 905                 if (s->s3->tmp.ecdh != NULL)
 906                         {
 907                         EC_KEY_free(s->s3->tmp.ecdh);
 908                         s->s3->tmp.ecdh = NULL;
 909                         }
 910 #endif
 911                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
 912                 return 2;
 913                 }
 914         return 1;
 915 }
 916
 917 int ssl3_get_client_hello(SSL *s)
 918         {
 919         int i,j,ok,al,ret= -1;
 920         unsigned int cookie_len;
 921         long n;
 922         unsigned long id;
 923         unsigned char *p,*d,*q;
 924         SSL_CIPHER *c;
 925 #ifndef OPENSSL_NO_COMP
 926         SSL_COMP *comp=NULL;
 927 #endif
 928         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 929
 930         /* We do this so that we will respond with our native type.
 931          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 932          * This down switching should be handled by a different method.
 933          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 934          * TLSv1.
 935          */
 936         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
 937                 )
 938                 {
 939                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 940                 }
 941         s->first_packet=1;
 942         n=s->method->ssl_get_message(s,
 943                 SSL3_ST_SR_CLNT_HELLO_B,
 944                 SSL3_ST_SR_CLNT_HELLO_C,
 945                 SSL3_MT_CLIENT_HELLO,
 946                 SSL3_RT_MAX_PLAIN_LENGTH,
 947                 &ok);
 948
 949         if (!ok) return((int)n);
 950         s->first_packet=0;
 951         d=p=(unsigned char *)s->init_msg;
 952
 953         /* use version from inside client hello, not from record header
 954          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 955         s->client_version=(((int)p[0])<<8)|(int)p[1];
 956         p+=2;
 957
 958         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 959             (s->version != DTLS1_VERSION && s->client_version < s->version))
 960                 {
 961                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 962                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 963                         {
 964                         /* similar to ssl3_get_record, send alert using remote version number */
 965                         s->version = s->client_version;
 966                         }
 967                 al = SSL_AD_PROTOCOL_VERSION;
 968                 goto f_err;
 969                 }
 970
 971         /* If we require cookies and this ClientHello doesn't
 972          * contain one, just return since we do not want to
 973          * allocate any memory yet. So check cookie length...
 974          */
 975         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
 976                 {
 977                 unsigned int session_length, cookie_length;
 978
 979                 session_length = *(p + SSL3_RANDOM_SIZE);
 980                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
 981
 982                 if (cookie_length == 0)
 983                         return 1;
 984                 }
 985
 986         /* load the client random */
 987         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 988         p+=SSL3_RANDOM_SIZE;
 989
 990         /* get the session-id */
 991         j= *(p++);
 992
 993         s->hit=0;
 994         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
 995          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
 996          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
 997          * than a change to default behavior so that applications relying on this for security
 998          * won't even compile against older library versions).
 999          *
1000          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1001          * renegotiation but not a new session (s->new_session remains unset): for servers,
1002          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1003          * setting will be ignored.
1004          */
1005         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1006                 {
1007                 if (!ssl_get_new_session(s,1))
1008                         goto err;
1009                 }
1010         else
1011                 {
1012                 i=ssl_get_prev_session(s, p, j, d + n);
1013                 if (i == 1)
1014                         { /* previous session */
1015                         s->hit=1;
1016                         }
1017                 else if (i == -1)
1018                         goto err;
1019                 else /* i == 0 */
1020                         {
1021                         if (!ssl_get_new_session(s,1))
1022                                 goto err;
1023                         }
1024                 }
1025
1026         p+=j;
1027
1028         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1029                 {
1030                 /* cookie stuff */
1031                 cookie_len = *(p++);
1032
1033                 /*
1034                  * The ClientHello may contain a cookie even if the
1035                  * HelloVerify message has not been sent--make sure that it
1036                  * does not cause an overflow.
1037                  */
1038                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1039                         {
1040                         /* too much data */
1041                         al = SSL_AD_DECODE_ERROR;
1042                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1043                         goto f_err;
1044                         }
1045
1046                 /* verify the cookie if appropriate option is set. */
1047                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1048                         cookie_len > 0)
1049                         {
1050                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1051
1052                         if ( s->ctx->app_verify_cookie_cb != NULL)
1053                                 {
1054                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1055                                         cookie_len) == 0)
1056                                         {
1057                                         al=SSL_AD_HANDSHAKE_FAILURE;
1058                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1059                                                 SSL_R_COOKIE_MISMATCH);
1060                                         goto f_err;
1061                                         }
1062                                 /* else cookie verification succeeded */
1063                                 }
1064                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
1065                                                   s->d1->cookie_len) != 0) /* default verification */
1066                                 {
1067                                         al=SSL_AD_HANDSHAKE_FAILURE;
1068                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1069                                                 SSL_R_COOKIE_MISMATCH);
1070                                         goto f_err;
1071                                 }
1072
1073                         ret = 2;
1074                         }
1075
1076                 p += cookie_len;
1077                 }
1078
1079         n2s(p,i);
1080         if ((i == 0) && (j != 0))
1081                 {
1082                 /* we need a cipher if we are not resuming a session */
1083                 al=SSL_AD_ILLEGAL_PARAMETER;
1084                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1085                 goto f_err;
1086                 }
1087         if ((p+i) >= (d+n))
1088                 {
1089                 /* not enough data */
1090                 al=SSL_AD_DECODE_ERROR;
1091                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1092                 goto f_err;
1093                 }
1094         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1095                 == NULL))
1096                 {
1097                 goto err;
1098                 }
1099         p+=i;
1100
1101         /* If it is a hit, check that the cipher is in the list */
1102         if ((s->hit) && (i > 0))
1103                 {
1104                 j=0;
1105                 id=s->session->cipher->id;
1106
1107 #ifdef CIPHER_DEBUG
1108                 printf("client sent %d ciphers\n",sk_num(ciphers));
1109 #endif
1110                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1111                         {
1112                         c=sk_SSL_CIPHER_value(ciphers,i);
1113 #ifdef CIPHER_DEBUG
1114                         printf("client [%2d of %2d]:%s\n",
1115                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1116 #endif
1117                         if (c->id == id)
1118                                 {
1119                                 j=1;
1120                                 break;
1121                                 }
1122                         }
1123 /* Disabled because it can be used in a ciphersuite downgrade
1124  * attack: CVE-2010-4180.
1125  */
1126 #if 0
1127                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1128                         {
1129                         /* Special case as client bug workaround: the previously used cipher may
1130                          * not be in the current list, the client instead might be trying to
1131                          * continue using a cipher that before wasn't chosen due to server
1132                          * preferences.  We'll have to reject the connection if the cipher is not
1133                          * enabled, though. */
1134                         c = sk_SSL_CIPHER_value(ciphers, 0);
1135                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1136                                 {
1137                                 s->session->cipher = c;
1138                                 j = 1;
1139                                 }
1140                         }
1141 #endif
1142                 if (j == 0)
1143                         {
1144                         /* we need to have the cipher in the cipher
1145                          * list if we are asked to reuse it */
1146                         al=SSL_AD_ILLEGAL_PARAMETER;
1147                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1148                         goto f_err;
1149                         }
1150                 }
1151
1152         /* compression */
1153         i= *(p++);
1154         if ((p+i) > (d+n))
1155                 {
1156                 /* not enough data */
1157                 al=SSL_AD_DECODE_ERROR;
1158                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1159                 goto f_err;
1160                 }
1161         q=p;
1162         for (j=0; j<i; j++)
1163                 {
1164                 if (p[j] == 0) break;
1165                 }
1166
1167         p+=i;
1168         if (j >= i)
1169                 {
1170                 /* no compress */
1171                 al=SSL_AD_DECODE_ERROR;
1172                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1173                 goto f_err;
1174                 }
1175
1176 #ifndef OPENSSL_NO_TLSEXT
1177         /* TLS extensions*/
1178         if (s->version >= SSL3_VERSION)
1179                 {
1180                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n))
1181                         {
1182                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1183                         goto err;
1184                         }
1185                 }
1186
1187         /* Check if we want to use external pre-shared secret for this
1188          * handshake for not reused session only. We need to generate
1189          * server_random before calling tls_session_secret_cb in order to allow
1190          * SessionTicket processing to use it in key derivation. */
1191         {
1192                 unsigned long Time;
1193                 unsigned char *pos;
1194                 Time=(unsigned long)time(NULL);                 /* Time */
1195                 pos=s->s3->server_random;
1196                 l2n(Time,pos);
1197                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1198                         {
1199                         al=SSL_AD_INTERNAL_ERROR;
1200                         goto f_err;
1201                         }
1202         }
1203
1204         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1205                 {
1206                 SSL_CIPHER *pref_cipher=NULL;
1207
1208                 s->session->master_key_length=sizeof(s->session->master_key);
1209                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1210                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1211                         {
1212                         s->hit=1;
1213                         s->session->ciphers=ciphers;
1214                         s->session->verify_result=X509_V_OK;
1215
1216                         ciphers=NULL;
1217
1218                         /* check if some cipher was preferred by call back */
1219                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1220                         if (pref_cipher == NULL)
1221                                 {
1222                                 al=SSL_AD_HANDSHAKE_FAILURE;
1223                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1224                                 goto f_err;
1225                                 }
1226
1227                         s->session->cipher=pref_cipher;
1228
1229                         if (s->cipher_list)
1230                                 sk_SSL_CIPHER_free(s->cipher_list);
1231
1232                         if (s->cipher_list_by_id)
1233                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1234
1235                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1236                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1237                         }
1238                 }
1239 #endif
1240
1241         /* Worst case, we will use the NULL compression, but if we have other
1242          * options, we will now look for them.  We have i-1 compression
1243          * algorithms from the client, starting at q. */
1244         s->s3->tmp.new_compression=NULL;
1245 #ifndef OPENSSL_NO_COMP
1246         /* This only happens if we have a cache hit */
1247         if (s->session->compress_meth != 0)
1248                 {
1249                 int m, comp_id = s->session->compress_meth;
1250                 /* Perform sanity checks on resumed compression algorithm */
1251                 /* Can't disable compression */
1252                 if (s->options & SSL_OP_NO_COMPRESSION)
1253                         {
1254                         al=SSL_AD_INTERNAL_ERROR;
1255                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1256                         goto f_err;
1257                         }
1258                 /* Look for resumed compression method */
1259                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1260                         {
1261                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1262                         if (comp_id == comp->id)
1263                                 {
1264                                 s->s3->tmp.new_compression=comp;
1265                                 break;
1266                                 }
1267                         }
1268                 if (s->s3->tmp.new_compression == NULL)
1269                         {
1270                         al=SSL_AD_INTERNAL_ERROR;
1271                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1272                         goto f_err;
1273                         }
1274                 /* Look for resumed method in compression list */
1275                 for (m = 0; m < i; m++)
1276                         {
1277                         if (q[m] == comp_id)
1278                                 break;
1279                         }
1280                 if (m >= i)
1281                         {
1282                         al=SSL_AD_ILLEGAL_PARAMETER;
1283                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1284                         goto f_err;
1285                         }
1286                 }
1287         else if (s->hit)
1288                 comp = NULL;
1289         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1290                 { /* See if we have a match */
1291                 int m,nn,o,v,done=0;
1292
1293                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1294                 for (m=0; m<nn; m++)
1295                         {
1296                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1297                         v=comp->id;
1298                         for (o=0; o<i; o++)
1299                                 {
1300                                 if (v == q[o])
1301                                         {
1302                                         done=1;
1303                                         break;
1304                                         }
1305                                 }
1306                         if (done) break;
1307                         }
1308                 if (done)
1309                         s->s3->tmp.new_compression=comp;
1310                 else
1311                         comp=NULL;
1312                 }
1313 #else
1314         /* If compression is disabled we'd better not try to resume a session
1315          * using compression.
1316          */
1317         if (s->session->compress_meth != 0)
1318                 {
1319                 al=SSL_AD_INTERNAL_ERROR;
1320                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1321                 goto f_err;
1322                 }
1323 #endif
1324
1325         /* Given s->session->ciphers and SSL_get_ciphers, we must
1326          * pick a cipher */
1327
1328         if (!s->hit)
1329                 {
1330 #ifdef OPENSSL_NO_COMP
1331                 s->session->compress_meth=0;
1332 #else
1333                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1334 #endif
1335                 if (s->session->ciphers != NULL)
1336                         sk_SSL_CIPHER_free(s->session->ciphers);
1337                 s->session->ciphers=ciphers;
1338                 if (ciphers == NULL)
1339                         {
1340                         al=SSL_AD_ILLEGAL_PARAMETER;
1341                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1342                         goto f_err;
1343                         }
1344                 /* Let cert callback update server certificates if required */
1345                 if (s->cert->cert_cb
1346                         && s->cert->cert_cb(s, s->cert->cert_cb_arg) <= 0)
1347                         {
1348                         al=SSL_AD_INTERNAL_ERROR;
1349                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CERT_CB_ERROR);
1350                         goto f_err;
1351                         }
1352                 ciphers=NULL;
1353                 c=ssl3_choose_cipher(s,s->session->ciphers,
1354                                      SSL_get_ciphers(s));
1355
1356                 if (c == NULL)
1357                         {
1358                         al=SSL_AD_HANDSHAKE_FAILURE;
1359                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1360                         goto f_err;
1361                         }
1362                 s->s3->tmp.new_cipher=c;
1363                 /* check whether we should disable session resumption */
1364                 if (s->not_resumable_session_cb != NULL)
1365                         s->session->not_resumable=s->not_resumable_session_cb(s,
1366                                 ((c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)) != 0));
1367                 if (s->session->not_resumable)
1368                         /* do not send a session ticket */
1369                         s->tlsext_ticket_expected = 0;
1370                 }
1371         else
1372                 {
1373                 /* Session-id reuse */
1374 #ifdef REUSE_CIPHER_BUG
1375                 STACK_OF(SSL_CIPHER) *sk;
1376                 SSL_CIPHER *nc=NULL;
1377                 SSL_CIPHER *ec=NULL;
1378
1379                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1380                         {
1381                         sk=s->session->ciphers;
1382                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1383                                 {
1384                                 c=sk_SSL_CIPHER_value(sk,i);
1385                                 if (c->algorithm_enc & SSL_eNULL)
1386                                         nc=c;
1387                                 if (SSL_C_IS_EXPORT(c))
1388                                         ec=c;
1389                                 }
1390                         if (nc != NULL)
1391                                 s->s3->tmp.new_cipher=nc;
1392                         else if (ec != NULL)
1393                                 s->s3->tmp.new_cipher=ec;
1394                         else
1395                                 s->s3->tmp.new_cipher=s->session->cipher;
1396                         }
1397                 else
1398 #endif
1399                 s->s3->tmp.new_cipher=s->session->cipher;
1400                 }
1401
1402         if (TLS1_get_version(s) < TLS1_2_VERSION || !(s->verify_mode & SSL_VERIFY_PEER))
1403                 {
1404                 if (!ssl3_digest_cached_records(s))
1405                         goto f_err;
1406                 }
1407
1408         /* we now have the following setup.
1409          * client_random
1410          * cipher_list          - our prefered list of ciphers
1411          * ciphers              - the clients prefered list of ciphers
1412          * compression          - basically ignored right now
1413          * ssl version is set   - sslv3
1414          * s->session           - The ssl session has been setup.
1415          * s->hit               - session reuse flag
1416          * s->tmp.new_cipher    - the new cipher to use.
1417          */
1418
1419         if (ret < 0) ret=1;
1420         if (0)
1421                 {
1422 f_err:
1423                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1424                 }
1425 err:
1426         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1427         return(ret);
1428         }
1429
1430 int ssl3_send_server_hello(SSL *s)
1431         {
1432         unsigned char *buf;
1433         unsigned char *p,*d;
1434         int i,sl;
1435         unsigned long l;
1436 #ifdef OPENSSL_NO_TLSEXT
1437         unsigned long Time;
1438 #endif
1439
1440         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1441                 {
1442                 buf=(unsigned char *)s->init_buf->data;
1443 #ifdef OPENSSL_NO_TLSEXT
1444                 p=s->s3->server_random;
1445                 /* Generate server_random if it was not needed previously */
1446                 Time=(unsigned long)time(NULL);                 /* Time */
1447                 l2n(Time,p);
1448                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1449                         return -1;
1450 #endif
1451                 /* Do the message type and length last */
1452                 d=p= &(buf[4]);
1453
1454                 *(p++)=s->version>>8;
1455                 *(p++)=s->version&0xff;
1456
1457                 /* Random stuff */
1458                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1459                 p+=SSL3_RANDOM_SIZE;
1460
1461                 /* There are several cases for the session ID to send
1462                  * back in the server hello:
1463                  * - For session reuse from the session cache,
1464                  *   we send back the old session ID.
1465                  * - If stateless session reuse (using a session ticket)
1466                  *   is successful, we send back the client's "session ID"
1467                  *   (which doesn't actually identify the session).
1468                  * - If it is a new session, we send back the new
1469                  *   session ID.
1470                  * - However, if we want the new session to be single-use,
1471                  *   we send back a 0-length session ID.
1472                  * s->hit is non-zero in either case of session reuse,
1473                  * so the following won't overwrite an ID that we're supposed
1474                  * to send back.
1475                  */
1476                 if (s->session->not_resumable ||
1477                         (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1478                                 && !s->hit))
1479                         s->session->session_id_length=0;
1480
1481                 sl=s->session->session_id_length;
1482                 if (sl > (int)sizeof(s->session->session_id))
1483                         {
1484                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1485                         return -1;
1486                         }
1487                 *(p++)=sl;
1488                 memcpy(p,s->session->session_id,sl);
1489                 p+=sl;
1490
1491                 /* put the cipher */
1492                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1493                 p+=i;
1494
1495                 /* put the compression method */
1496 #ifdef OPENSSL_NO_COMP
1497                         *(p++)=0;
1498 #else
1499                 if (s->s3->tmp.new_compression == NULL)
1500                         *(p++)=0;
1501                 else
1502                         *(p++)=s->s3->tmp.new_compression->id;
1503 #endif
1504 #ifndef OPENSSL_NO_TLSEXT
1505                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1506                         {
1507                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1508                         return -1;
1509                         }
1510                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1511                         {
1512                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1513                         return -1;
1514                         }
1515 #endif
1516                 /* do the header */
1517                 l=(p-d);
1518                 d=buf;
1519                 *(d++)=SSL3_MT_SERVER_HELLO;
1520                 l2n3(l,d);
1521
1522                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1523                 /* number of bytes to write */
1524                 s->init_num=p-buf;
1525                 s->init_off=0;
1526                 }
1527
1528         /* SSL3_ST_SW_SRVR_HELLO_B */
1529         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1530         }
1531
1532 int ssl3_send_server_done(SSL *s)
1533         {
1534         unsigned char *p;
1535
1536         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1537                 {
1538                 p=(unsigned char *)s->init_buf->data;
1539
1540                 /* do the header */
1541                 *(p++)=SSL3_MT_SERVER_DONE;
1542                 *(p++)=0;
1543                 *(p++)=0;
1544                 *(p++)=0;
1545
1546                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1547                 /* number of bytes to write */
1548                 s->init_num=4;
1549                 s->init_off=0;
1550                 }
1551
1552         /* SSL3_ST_SW_SRVR_DONE_B */
1553         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1554         }
1555
1556 int ssl3_send_server_key_exchange(SSL *s)
1557         {
1558 #ifndef OPENSSL_NO_RSA
1559         unsigned char *q;
1560         int j,num;
1561         RSA *rsa;
1562         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1563         unsigned int u;
1564 #endif
1565 #ifndef OPENSSL_NO_DH
1566         DH *dh=NULL,*dhp;
1567 #endif
1568 #ifndef OPENSSL_NO_ECDH
1569         EC_KEY *ecdh=NULL, *ecdhp;
1570         unsigned char *encodedPoint = NULL;
1571         int encodedlen = 0;
1572         int curve_id = 0;
1573         BN_CTX *bn_ctx = NULL;
1574 #endif
1575         EVP_PKEY *pkey;
1576         const EVP_MD *md = NULL;
1577         unsigned char *p,*d;
1578         int al,i;
1579         unsigned long type;
1580         int n;
1581         CERT *cert;
1582         BIGNUM *r[4];
1583         int nr[4],kn;
1584         BUF_MEM *buf;
1585         EVP_MD_CTX md_ctx;
1586
1587         EVP_MD_CTX_init(&md_ctx);
1588         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1589                 {
1590                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1591                 cert=s->cert;
1592
1593                 buf=s->init_buf;
1594
1595                 r[0]=r[1]=r[2]=r[3]=NULL;
1596                 n=0;
1597 #ifndef OPENSSL_NO_RSA
1598                 if (type & SSL_kRSA)
1599                         {
1600                         rsa=cert->rsa_tmp;
1601                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1602                                 {
1603                                 rsa=s->cert->rsa_tmp_cb(s,
1604                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1605                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1606                                 if(rsa == NULL)
1607                                 {
1608                                         al=SSL_AD_HANDSHAKE_FAILURE;
1609                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1610                                         goto f_err;
1611                                 }
1612                                 RSA_up_ref(rsa);
1613                                 cert->rsa_tmp=rsa;
1614                                 }
1615                         if (rsa == NULL)
1616                                 {
1617                                 al=SSL_AD_HANDSHAKE_FAILURE;
1618                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1619                                 goto f_err;
1620                                 }
1621                         r[0]=rsa->n;
1622                         r[1]=rsa->e;
1623                         s->s3->tmp.use_rsa_tmp=1;
1624                         }
1625                 else
1626 #endif
1627 #ifndef OPENSSL_NO_DH
1628                         if (type & SSL_kEDH)
1629                         {
1630                         dhp=cert->dh_tmp;
1631                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1632                                 dhp=s->cert->dh_tmp_cb(s,
1633                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1634                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1635                         if (dhp == NULL)
1636                                 {
1637                                 al=SSL_AD_HANDSHAKE_FAILURE;
1638                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1639                                 goto f_err;
1640                                 }
1641
1642                         if (s->s3->tmp.dh != NULL)
1643                                 {
1644                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1645                                 goto err;
1646                                 }
1647
1648                         if ((dh=DHparams_dup(dhp)) == NULL)
1649                                 {
1650                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1651                                 goto err;
1652                                 }
1653
1654                         s->s3->tmp.dh=dh;
1655                         if ((dhp->pub_key == NULL ||
1656                              dhp->priv_key == NULL ||
1657                              (s->options & SSL_OP_SINGLE_DH_USE)))
1658                                 {
1659                                 if(!DH_generate_key(dh))
1660                                     {
1661                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1662                                            ERR_R_DH_LIB);
1663                                     goto err;
1664                                     }
1665                                 }
1666                         else
1667                                 {
1668                                 dh->pub_key=BN_dup(dhp->pub_key);
1669                                 dh->priv_key=BN_dup(dhp->priv_key);
1670                                 if ((dh->pub_key == NULL) ||
1671                                         (dh->priv_key == NULL))
1672                                         {
1673                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1674                                         goto err;
1675                                         }
1676                                 }
1677                         r[0]=dh->p;
1678                         r[1]=dh->g;
1679                         r[2]=dh->pub_key;
1680                         }
1681                 else
1682 #endif
1683 #ifndef OPENSSL_NO_ECDH
1684                         if (type & SSL_kEECDH)
1685                         {
1686                         const EC_GROUP *group;
1687
1688                         ecdhp=cert->ecdh_tmp;
1689                         if (s->cert->ecdh_tmp_auto)
1690                                 {
1691                                 /* Get NID of first shared curve */
1692                                 int nid = tls1_shared_curve(s, 0);
1693                                 if (nid != NID_undef)
1694                                         ecdhp = EC_KEY_new_by_curve_name(nid);
1695                                 }
1696                         else if ((ecdhp == NULL) && s->cert->ecdh_tmp_cb)
1697                                 {
1698                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1699                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1700                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1701                                 }
1702                         if (ecdhp == NULL)
1703                                 {
1704                                 al=SSL_AD_HANDSHAKE_FAILURE;
1705                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1706                                 goto f_err;
1707                                 }
1708
1709                         if (s->s3->tmp.ecdh != NULL)
1710                                 {
1711                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1712                                 goto err;
1713                                 }
1714
1715                         /* Duplicate the ECDH structure. */
1716                         if (ecdhp == NULL)
1717                                 {
1718                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1719                                 goto err;
1720                                 }
1721                         if (s->cert->ecdh_tmp_auto)
1722                                 ecdh = ecdhp;
1723                         else if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1724                                 {
1725                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1726                                 goto err;
1727                                 }
1728
1729                         s->s3->tmp.ecdh=ecdh;
1730                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1731                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1732                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1733                                 {
1734                                 if(!EC_KEY_generate_key(ecdh))
1735                                     {
1736                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1737                                     goto err;
1738                                     }
1739                                 }
1740
1741                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1742                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1743                             (EC_KEY_get0_private_key(ecdh) == NULL))
1744                                 {
1745                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1746                                 goto err;
1747                                 }
1748
1749                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1750                             (EC_GROUP_get_degree(group) > 163))
1751                                 {
1752                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1753                                 goto err;
1754                                 }
1755
1756                         /* XXX: For now, we only support ephemeral ECDH
1757                          * keys over named (not generic) curves. For
1758                          * supported named curves, curve_id is non-zero.
1759                          */
1760                         if ((curve_id =
1761                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1762                             == 0)
1763                                 {
1764                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1765                                 goto err;
1766                                 }
1767
1768                         /* Encode the public key.
1769                          * First check the size of encoding and
1770                          * allocate memory accordingly.
1771                          */
1772                         encodedlen = EC_POINT_point2oct(group,
1773                             EC_KEY_get0_public_key(ecdh),
1774                             POINT_CONVERSION_UNCOMPRESSED,
1775                             NULL, 0, NULL);
1776
1777                         encodedPoint = (unsigned char *)
1778                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1779                         bn_ctx = BN_CTX_new();
1780                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1781                                 {
1782                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1783                                 goto err;
1784                                 }
1785
1786
1787                         encodedlen = EC_POINT_point2oct(group,
1788                             EC_KEY_get0_public_key(ecdh),
1789                             POINT_CONVERSION_UNCOMPRESSED,
1790                             encodedPoint, encodedlen, bn_ctx);
1791
1792                         if (encodedlen == 0)
1793                                 {
1794                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1795                                 goto err;
1796                                 }
1797
1798                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1799
1800                         /* XXX: For now, we only support named (not
1801                          * generic) curves in ECDH ephemeral key exchanges.
1802                          * In this situation, we need four additional bytes
1803                          * to encode the entire ServerECDHParams
1804                          * structure.
1805                          */
1806                         n = 4 + encodedlen;
1807
1808                         /* We'll generate the serverKeyExchange message
1809                          * explicitly so we can set these to NULLs
1810                          */
1811                         r[0]=NULL;
1812                         r[1]=NULL;
1813                         r[2]=NULL;
1814                         r[3]=NULL;
1815                         }
1816                 else
1817 #endif /* !OPENSSL_NO_ECDH */
1818 #ifndef OPENSSL_NO_PSK
1819                         if (type & SSL_kPSK)
1820                                 {
1821                                 /* reserve size for record length and PSK identity hint*/
1822                                 n+=2+strlen(s->ctx->psk_identity_hint);
1823                                 }
1824                         else
1825 #endif /* !OPENSSL_NO_PSK */
1826 #ifndef OPENSSL_NO_SRP
1827                 if (type & SSL_kSRP)
1828                         {
1829                         if ((s->srp_ctx.N == NULL) ||
1830                                 (s->srp_ctx.g == NULL) ||
1831                                 (s->srp_ctx.s == NULL) ||
1832                                 (s->srp_ctx.B == NULL))
1833                                 {
1834                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1835                                 goto err;
1836                                 }
1837                         r[0]=s->srp_ctx.N;
1838                         r[1]=s->srp_ctx.g;
1839                         r[2]=s->srp_ctx.s;
1840                         r[3]=s->srp_ctx.B;
1841                         }
1842                 else
1843 #endif
1844                         {
1845                         al=SSL_AD_HANDSHAKE_FAILURE;
1846                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1847                         goto f_err;
1848                         }
1849                 for (i=0; r[i] != NULL && i<4; i++)
1850                         {
1851                         nr[i]=BN_num_bytes(r[i]);
1852 #ifndef OPENSSL_NO_SRP
1853                         if ((i == 2) && (type & SSL_kSRP))
1854                                 n+=1+nr[i];
1855                         else
1856 #endif
1857                         n+=2+nr[i];
1858                         }
1859
1860                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1861                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1862                         {
1863                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1864                                 == NULL)
1865                                 {
1866                                 al=SSL_AD_DECODE_ERROR;
1867                                 goto f_err;
1868                                 }
1869                         kn=EVP_PKEY_size(pkey);
1870                         }
1871                 else
1872                         {
1873                         pkey=NULL;
1874                         kn=0;
1875                         }
1876
1877                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1878                         {
1879                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1880                         goto err;
1881                         }
1882                 d=(unsigned char *)s->init_buf->data;
1883                 p= &(d[4]);
1884
1885                 for (i=0; r[i] != NULL && i<4; i++)
1886                         {
1887 #ifndef OPENSSL_NO_SRP
1888                         if ((i == 2) && (type & SSL_kSRP))
1889                                 {
1890                                 *p = nr[i];
1891                                 p++;
1892                                 }
1893                         else
1894 #endif
1895                         s2n(nr[i],p);
1896                         BN_bn2bin(r[i],p);
1897                         p+=nr[i];
1898                         }
1899
1900 #ifndef OPENSSL_NO_ECDH
1901                 if (type & SSL_kEECDH)
1902                         {
1903                         /* XXX: For now, we only support named (not generic) curves.
1904                          * In this situation, the serverKeyExchange message has:
1905                          * [1 byte CurveType], [2 byte CurveName]
1906                          * [1 byte length of encoded point], followed by
1907                          * the actual encoded point itself
1908                          */
1909                         *p = NAMED_CURVE_TYPE;
1910                         p += 1;
1911                         *p = 0;
1912                         p += 1;
1913                         *p = curve_id;
1914                         p += 1;
1915                         *p = encodedlen;
1916                         p += 1;
1917                         memcpy((unsigned char*)p,
1918                             (unsigned char *)encodedPoint,
1919                             encodedlen);
1920                         OPENSSL_free(encodedPoint);
1921                         encodedPoint = NULL;
1922                         p += encodedlen;
1923                         }
1924 #endif
1925
1926 #ifndef OPENSSL_NO_PSK
1927                 if (type & SSL_kPSK)
1928                         {
1929                         /* copy PSK identity hint */
1930                         s2n(strlen(s->ctx->psk_identity_hint), p);
1931                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1932                         p+=strlen(s->ctx->psk_identity_hint);
1933                         }
1934 #endif
1935
1936                 /* not anonymous */
1937                 if (pkey != NULL)
1938                         {
1939                         /* n is the length of the params, they start at &(d[4])
1940                          * and p points to the space at the end. */
1941 #ifndef OPENSSL_NO_RSA
1942                         if (pkey->type == EVP_PKEY_RSA
1943                                         && TLS1_get_version(s) < TLS1_2_VERSION)
1944                                 {
1945                                 q=md_buf;
1946                                 j=0;
1947                                 for (num=2; num > 0; num--)
1948                                         {
1949                                         EVP_MD_CTX_set_flags(&md_ctx,
1950                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1951                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1952                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1953                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1954                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1955                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1956                                         EVP_DigestFinal_ex(&md_ctx,q,
1957                                                 (unsigned int *)&i);
1958                                         q+=i;
1959                                         j+=i;
1960                                         }
1961                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1962                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1963                                         {
1964                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1965                                         goto err;
1966                                         }
1967                                 s2n(u,p);
1968                                 n+=u+2;
1969                                 }
1970                         else
1971 #endif
1972                         if (md)
1973                                 {
1974                                 /* For TLS1.2 and later send signature
1975                                  * algorithm */
1976                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1977                                         {
1978                                         if (!tls12_get_sigandhash(p, pkey, md))
1979                                                 {
1980                                                 /* Should never happen */
1981                                                 al=SSL_AD_INTERNAL_ERROR;
1982                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1983                                                 goto f_err;
1984                                                 }
1985                                         p+=2;
1986                                         }
1987 #ifdef SSL_DEBUG
1988                                 fprintf(stderr, "Using hash %s\n",
1989                                                         EVP_MD_name(md));
1990 #endif
1991                                 EVP_SignInit_ex(&md_ctx, md, NULL);
1992                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1993                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1994                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1995                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1996                                         (unsigned int *)&i,pkey))
1997                                         {
1998                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
1999                                         goto err;
2000                                         }
2001                                 s2n(i,p);
2002                                 n+=i+2;
2003                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2004                                         n+= 2;
2005                                 }
2006                         else
2007                                 {
2008                                 /* Is this error check actually needed? */
2009                                 al=SSL_AD_HANDSHAKE_FAILURE;
2010                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2011                                 goto f_err;
2012                                 }
2013                         }
2014
2015                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
2016                 l2n3(n,d);
2017
2018                 /* we should now have things packed up, so lets send
2019                  * it off */
2020                 s->init_num=n+4;
2021                 s->init_off=0;
2022                 }
2023
2024         s->state = SSL3_ST_SW_KEY_EXCH_B;
2025         EVP_MD_CTX_cleanup(&md_ctx);
2026         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2027 f_err:
2028         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2029 err:
2030 #ifndef OPENSSL_NO_ECDH
2031         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2032         BN_CTX_free(bn_ctx);
2033 #endif
2034         EVP_MD_CTX_cleanup(&md_ctx);
2035         return(-1);
2036         }
2037
2038 int ssl3_send_certificate_request(SSL *s)
2039         {
2040         unsigned char *p,*d;
2041         int i,j,nl,off,n;
2042         STACK_OF(X509_NAME) *sk=NULL;
2043         X509_NAME *name;
2044         BUF_MEM *buf;
2045
2046         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2047                 {
2048                 buf=s->init_buf;
2049
2050                 d=p=(unsigned char *)&(buf->data[4]);
2051
2052                 /* get the list of acceptable cert types */
2053                 p++;
2054                 n=ssl3_get_req_cert_type(s,p);
2055                 d[0]=n;
2056                 p+=n;
2057                 n++;
2058
2059                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2060                         {
2061                         nl = tls12_get_req_sig_algs(s, p + 2);
2062                         s2n(nl, p);
2063                         p += nl + 2;
2064                         n += nl + 2;
2065                         }
2066
2067                 off=n;
2068                 p+=2;
2069                 n+=2;
2070
2071                 sk=SSL_get_client_CA_list(s);
2072                 nl=0;
2073                 if (sk != NULL)
2074                         {
2075                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2076                                 {
2077                                 name=sk_X509_NAME_value(sk,i);
2078                                 j=i2d_X509_NAME(name,NULL);
2079                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2080                                         {
2081                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2082                                         goto err;
2083                                         }
2084                                 p=(unsigned char *)&(buf->data[4+n]);
2085                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2086                                         {
2087                                         s2n(j,p);
2088                                         i2d_X509_NAME(name,&p);
2089                                         n+=2+j;
2090                                         nl+=2+j;
2091                                         }
2092                                 else
2093                                         {
2094                                         d=p;
2095                                         i2d_X509_NAME(name,&p);
2096                                         j-=2; s2n(j,d); j+=2;
2097                                         n+=j;
2098                                         nl+=j;
2099                                         }
2100                                 }
2101                         }
2102                 /* else no CA names */
2103                 p=(unsigned char *)&(buf->data[4+off]);
2104                 s2n(nl,p);
2105
2106                 d=(unsigned char *)buf->data;
2107                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
2108                 l2n3(n,d);
2109
2110                 /* we should now have things packed up, so lets send
2111                  * it off */
2112
2113                 s->init_num=n+4;
2114                 s->init_off=0;
2115 #ifdef NETSCAPE_HANG_BUG
2116                 p=(unsigned char *)s->init_buf->data + s->init_num;
2117
2118                 /* do the header */
2119                 *(p++)=SSL3_MT_SERVER_DONE;
2120                 *(p++)=0;
2121                 *(p++)=0;
2122                 *(p++)=0;
2123                 s->init_num += 4;
2124 #endif
2125
2126                 s->state = SSL3_ST_SW_CERT_REQ_B;
2127                 }
2128
2129         /* SSL3_ST_SW_CERT_REQ_B */
2130         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2131 err:
2132         return(-1);
2133         }
2134
2135 int ssl3_get_client_key_exchange(SSL *s)
2136         {
2137         int i,al,ok;
2138         long n;
2139         unsigned long alg_k;
2140         unsigned char *p;
2141 #ifndef OPENSSL_NO_RSA
2142         RSA *rsa=NULL;
2143         EVP_PKEY *pkey=NULL;
2144 #endif
2145 #ifndef OPENSSL_NO_DH
2146         BIGNUM *pub=NULL;
2147         DH *dh_srvr, *dh_clnt = NULL;
2148 #endif
2149 #ifndef OPENSSL_NO_KRB5
2150         KSSL_ERR kssl_err;
2151 #endif /* OPENSSL_NO_KRB5 */
2152
2153 #ifndef OPENSSL_NO_ECDH
2154         EC_KEY *srvr_ecdh = NULL;
2155         EVP_PKEY *clnt_pub_pkey = NULL;
2156         EC_POINT *clnt_ecpoint = NULL;
2157         BN_CTX *bn_ctx = NULL;
2158 #endif
2159
2160         n=s->method->ssl_get_message(s,
2161                 SSL3_ST_SR_KEY_EXCH_A,
2162                 SSL3_ST_SR_KEY_EXCH_B,
2163                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2164                 2048, /* ??? */
2165                 &ok);
2166
2167         if (!ok) return((int)n);
2168         p=(unsigned char *)s->init_msg;
2169
2170         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2171
2172 #ifndef OPENSSL_NO_RSA
2173         if (alg_k & SSL_kRSA)
2174                 {
2175                 /* FIX THIS UP EAY EAY EAY EAY */
2176                 if (s->s3->tmp.use_rsa_tmp)
2177                         {
2178                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2179                                 rsa=s->cert->rsa_tmp;
2180                         /* Don't do a callback because rsa_tmp should
2181                          * be sent already */
2182                         if (rsa == NULL)
2183                                 {
2184                                 al=SSL_AD_HANDSHAKE_FAILURE;
2185                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2186                                 goto f_err;
2187
2188                                 }
2189                         }
2190                 else
2191                         {
2192                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2193                         if (    (pkey == NULL) ||
2194                                 (pkey->type != EVP_PKEY_RSA) ||
2195                                 (pkey->pkey.rsa == NULL))
2196                                 {
2197                                 al=SSL_AD_HANDSHAKE_FAILURE;
2198                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2199                                 goto f_err;
2200                                 }
2201                         rsa=pkey->pkey.rsa;
2202                         }
2203
2204                 /* TLS and [incidentally] DTLS{0xFEFF} */
2205                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2206                         {
2207                         n2s(p,i);
2208                         if (n != i+2)
2209                                 {
2210                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2211                                         {
2212                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2213                                         goto err;
2214                                         }
2215                                 else
2216                                         p-=2;
2217                                 }
2218                         else
2219                                 n=i;
2220                         }
2221
2222                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2223
2224                 al = -1;
2225
2226                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2227                         {
2228                         al=SSL_AD_DECODE_ERROR;
2229                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2230                         }
2231
2232                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2233                         {
2234                         /* The premaster secret must contain the same version number as the
2235                          * ClientHello to detect version rollback attacks (strangely, the
2236                          * protocol does not offer such protection for DH ciphersuites).
2237                          * However, buggy clients exist that send the negotiated protocol
2238                          * version instead if the server does not support the requested
2239                          * protocol version.
2240                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2241                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2242                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2243                                 {
2244                                 al=SSL_AD_DECODE_ERROR;
2245                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2246
2247                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2248                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2249                                  * number check as a "bad version oracle" -- an alert would
2250                                  * reveal that the plaintext corresponding to some ciphertext
2251                                  * made up by the adversary is properly formatted except
2252                                  * that the version number is wrong.  To avoid such attacks,
2253                                  * we should treat this just like any other decryption error. */
2254                                 }
2255                         }
2256
2257                 if (al != -1)
2258                         {
2259                         /* Some decryption failure -- use random value instead as countermeasure
2260                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2261                          * (see RFC 2246, section 7.4.7.1). */
2262                         ERR_clear_error();
2263                         i = SSL_MAX_MASTER_KEY_LENGTH;
2264                         p[0] = s->client_version >> 8;
2265                         p[1] = s->client_version & 0xff;
2266                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2267                                 goto err;
2268                         }
2269
2270                 s->session->master_key_length=
2271                         s->method->ssl3_enc->generate_master_secret(s,
2272                                 s->session->master_key,
2273                                 p,i);
2274                 OPENSSL_cleanse(p,i);
2275                 }
2276         else
2277 #endif
2278 #ifndef OPENSSL_NO_DH
2279                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2280                 {
2281                 int idx = -1;
2282                 EVP_PKEY *skey = NULL;
2283                 if (n)
2284                         n2s(p,i);
2285                 else
2286                         i = 0;
2287                 if (n && n != i+2)
2288                         {
2289                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2290                                 {
2291                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2292                                 goto err;
2293                                 }
2294                         else
2295                                 {
2296                                 p-=2;
2297                                 i=(int)n;
2298                                 }
2299                         }
2300                 if (alg_k & SSL_kDHr)
2301                         idx = SSL_PKEY_DH_RSA;
2302                 else if (alg_k & SSL_kDHd)
2303                         idx = SSL_PKEY_DH_DSA;
2304                 if (idx >= 0)
2305                         {
2306                         skey = s->cert->pkeys[idx].privatekey;
2307                         if ((skey == NULL) ||
2308                                 (skey->type != EVP_PKEY_DH) ||
2309                                 (skey->pkey.dh == NULL))
2310                                 {
2311                                 al=SSL_AD_HANDSHAKE_FAILURE;
2312                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2313                                 goto f_err;
2314                                 }
2315                         dh_srvr = skey->pkey.dh;
2316                         }
2317                 else if (s->s3->tmp.dh == NULL)
2318                         {
2319                         al=SSL_AD_HANDSHAKE_FAILURE;
2320                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2321                         goto f_err;
2322                         }
2323                 else
2324                         dh_srvr=s->s3->tmp.dh;
2325
2326                 if (n == 0L)
2327                         {
2328                         /* Get pubkey from cert */
2329                         EVP_PKEY *clkey=X509_get_pubkey(s->session->peer);
2330                         if (clkey)
2331                                 {
2332                                 if (EVP_PKEY_cmp_parameters(clkey, skey) == 1)
2333                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2334                                 }
2335                         if (dh_clnt == NULL)
2336                                 {
2337                                 al=SSL_AD_HANDSHAKE_FAILURE;
2338                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2339                                 goto f_err;
2340                                 }
2341                         EVP_PKEY_free(clkey);
2342                         pub = dh_clnt->pub_key;
2343                         }
2344                 else
2345                         pub=BN_bin2bn(p,i,NULL);
2346                 if (pub == NULL)
2347                         {
2348                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2349                         goto err;
2350                         }
2351
2352                 i=DH_compute_key(p,pub,dh_srvr);
2353
2354                 if (i <= 0)
2355                         {
2356                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2357                         BN_clear_free(pub);
2358                         goto err;
2359                         }
2360
2361                 DH_free(s->s3->tmp.dh);
2362                 s->s3->tmp.dh=NULL;
2363                 if (dh_clnt)
2364                         DH_free(dh_clnt);
2365                 else
2366                         BN_clear_free(pub);
2367                 pub=NULL;
2368                 s->session->master_key_length=
2369                         s->method->ssl3_enc->generate_master_secret(s,
2370                                 s->session->master_key,p,i);
2371                 OPENSSL_cleanse(p,i);
2372                 if (dh_clnt)
2373                         return 2;
2374                 }
2375         else
2376 #endif
2377 #ifndef OPENSSL_NO_KRB5
2378         if (alg_k & SSL_kKRB5)
2379                 {
2380                 krb5_error_code         krb5rc;
2381                 krb5_data               enc_ticket;
2382                 krb5_data               authenticator;
2383                 krb5_data               enc_pms;
2384                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2385                 EVP_CIPHER_CTX          ciph_ctx;
2386                 const EVP_CIPHER        *enc = NULL;
2387                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2388                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2389                                                + EVP_MAX_BLOCK_LENGTH];
2390                 int                  padl, outl;
2391                 krb5_timestamp          authtime = 0;
2392                 krb5_ticket_times       ttimes;
2393
2394                 EVP_CIPHER_CTX_init(&ciph_ctx);
2395
2396                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2397
2398                 n2s(p,i);
2399                 enc_ticket.length = i;
2400
2401                 if (n < (long)(enc_ticket.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                 enc_ticket.data = (char *)p;
2409                 p+=enc_ticket.length;
2410
2411                 n2s(p,i);
2412                 authenticator.length = i;
2413
2414                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2415                         {
2416                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2417                                 SSL_R_DATA_LENGTH_TOO_LONG);
2418                         goto err;
2419                         }
2420
2421                 authenticator.data = (char *)p;
2422                 p+=authenticator.length;
2423
2424                 n2s(p,i);
2425                 enc_pms.length = i;
2426                 enc_pms.data = (char *)p;
2427                 p+=enc_pms.length;
2428
2429                 /* Note that the length is checked again below,
2430                 ** after decryption
2431                 */
2432                 if(enc_pms.length > sizeof pms)
2433                         {
2434                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2435                                SSL_R_DATA_LENGTH_TOO_LONG);
2436                         goto err;
2437                         }
2438
2439                 if (n != (long)(enc_ticket.length + authenticator.length +
2440                                                 enc_pms.length + 6))
2441                         {
2442                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2443                                 SSL_R_DATA_LENGTH_TOO_LONG);
2444                         goto err;
2445                         }
2446
2447                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2448                                         &kssl_err)) != 0)
2449                         {
2450 #ifdef KSSL_DEBUG
2451                         printf("kssl_sget_tkt rtn %d [%d]\n",
2452                                 krb5rc, kssl_err.reason);
2453                         if (kssl_err.text)
2454                                 printf("kssl_err text= %s\n", kssl_err.text);
2455 #endif  /* KSSL_DEBUG */
2456                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2457                                 kssl_err.reason);
2458                         goto err;
2459                         }
2460
2461                 /*  Note: no authenticator is not considered an error,
2462                 **  but will return authtime == 0.
2463                 */
2464                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2465                                         &authtime, &kssl_err)) != 0)
2466                         {
2467 #ifdef KSSL_DEBUG
2468                         printf("kssl_check_authent rtn %d [%d]\n",
2469                                 krb5rc, kssl_err.reason);
2470                         if (kssl_err.text)
2471                                 printf("kssl_err text= %s\n", kssl_err.text);
2472 #endif  /* KSSL_DEBUG */
2473                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2474                                 kssl_err.reason);
2475                         goto err;
2476                         }
2477
2478                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2479                         {
2480                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2481                         goto err;
2482                         }
2483
2484 #ifdef KSSL_DEBUG
2485                 kssl_ctx_show(kssl_ctx);
2486 #endif  /* KSSL_DEBUG */
2487
2488                 enc = kssl_map_enc(kssl_ctx->enctype);
2489                 if (enc == NULL)
2490                     goto err;
2491
2492                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2493
2494                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2495                         {
2496                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2497                                 SSL_R_DECRYPTION_FAILED);
2498                         goto err;
2499                         }
2500                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2501                                         (unsigned char *)enc_pms.data, enc_pms.length))
2502                         {
2503                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2504                                 SSL_R_DECRYPTION_FAILED);
2505                         goto err;
2506                         }
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 (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2514                         {
2515                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2516                                 SSL_R_DECRYPTION_FAILED);
2517                         goto err;
2518                         }
2519                 outl += padl;
2520                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2521                         {
2522                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2523                                 SSL_R_DATA_LENGTH_TOO_LONG);
2524                         goto err;
2525                         }
2526                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2527                     {
2528                     /* The premaster secret must contain the same version number as the
2529                      * ClientHello to detect version rollback attacks (strangely, the
2530                      * protocol does not offer such protection for DH ciphersuites).
2531                      * However, buggy clients exist that send random bytes instead of
2532                      * the protocol version.
2533                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2534                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2535                      */
2536                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2537                         {
2538                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2539                                SSL_AD_DECODE_ERROR);
2540                         goto err;
2541                         }
2542                     }
2543
2544                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2545
2546                 s->session->master_key_length=
2547                         s->method->ssl3_enc->generate_master_secret(s,
2548                                 s->session->master_key, pms, outl);
2549
2550                 if (kssl_ctx->client_princ)
2551                         {
2552                         size_t len = strlen(kssl_ctx->client_princ);
2553                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2554                                 {
2555                                 s->session->krb5_client_princ_len = len;
2556                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2557                                 }
2558                         }
2559
2560
2561                 /*  Was doing kssl_ctx_free() here,
2562                 **  but it caused problems for apache.
2563                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2564                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2565                 */
2566                 }
2567         else
2568 #endif  /* OPENSSL_NO_KRB5 */
2569
2570 #ifndef OPENSSL_NO_ECDH
2571                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2572                 {
2573                 int ret = 1;
2574                 int field_size = 0;
2575                 const EC_KEY   *tkey;
2576                 const EC_GROUP *group;
2577                 const BIGNUM *priv_key;
2578
2579                 /* initialize structures for server's ECDH key pair */
2580                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2581                         {
2582                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2583                             ERR_R_MALLOC_FAILURE);
2584                         goto err;
2585                         }
2586
2587                 /* Let's get server private key and group information */
2588                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2589                         {
2590                         /* use the certificate */
2591                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2592                         }
2593                 else
2594                         {
2595                         /* use the ephermeral values we saved when
2596                          * generating the ServerKeyExchange msg.
2597                          */
2598                         tkey = s->s3->tmp.ecdh;
2599                         }
2600
2601                 group    = EC_KEY_get0_group(tkey);
2602                 priv_key = EC_KEY_get0_private_key(tkey);
2603
2604                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2605                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2606                         {
2607                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2608                                ERR_R_EC_LIB);
2609                         goto err;
2610                         }
2611
2612                 /* Let's get client's public key */
2613                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2614                         {
2615                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2616                             ERR_R_MALLOC_FAILURE);
2617                         goto err;
2618                         }
2619
2620                 if (n == 0L)
2621                         {
2622                         /* Client Publickey was in Client Certificate */
2623
2624                          if (alg_k & SSL_kEECDH)
2625                                  {
2626                                  al=SSL_AD_HANDSHAKE_FAILURE;
2627                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2628                                  goto f_err;
2629                                  }
2630                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2631                             == NULL) ||
2632                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2633                                 {
2634                                 /* XXX: For now, we do not support client
2635                                  * authentication using ECDH certificates
2636                                  * so this branch (n == 0L) of the code is
2637                                  * never executed. When that support is
2638                                  * added, we ought to ensure the key
2639                                  * received in the certificate is
2640                                  * authorized for key agreement.
2641                                  * ECDH_compute_key implicitly checks that
2642                                  * the two ECDH shares are for the same
2643                                  * group.
2644                                  */
2645                                 al=SSL_AD_HANDSHAKE_FAILURE;
2646                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2647                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2648                                 goto f_err;
2649                                 }
2650
2651                         if (EC_POINT_copy(clnt_ecpoint,
2652                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2653                                 {
2654                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2655                                         ERR_R_EC_LIB);
2656                                 goto err;
2657                                 }
2658                         ret = 2; /* Skip certificate verify processing */
2659                         }
2660                 else
2661                         {
2662                         /* Get client's public key from encoded point
2663                          * in the ClientKeyExchange message.
2664                          */
2665                         if ((bn_ctx = BN_CTX_new()) == NULL)
2666                                 {
2667                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2668                                     ERR_R_MALLOC_FAILURE);
2669                                 goto err;
2670                                 }
2671
2672                         /* Get encoded point length */
2673                         i = *p;
2674                         p += 1;
2675                         if (n != 1 + i)
2676                                 {
2677                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2678                                     ERR_R_EC_LIB);
2679                                 goto err;
2680                                 }
2681                         if (EC_POINT_oct2point(group,
2682                             clnt_ecpoint, p, i, bn_ctx) == 0)
2683                                 {
2684                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2685                                     ERR_R_EC_LIB);
2686                                 goto err;
2687                                 }
2688                         /* p is pointing to somewhere in the buffer
2689                          * currently, so set it to the start
2690                          */
2691                         p=(unsigned char *)s->init_buf->data;
2692                         }
2693
2694                 /* Compute the shared pre-master secret */
2695                 field_size = EC_GROUP_get_degree(group);
2696                 if (field_size <= 0)
2697                         {
2698                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2699                                ERR_R_ECDH_LIB);
2700                         goto err;
2701                         }
2702                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2703                 if (i <= 0)
2704                         {
2705                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2706                             ERR_R_ECDH_LIB);
2707                         goto err;
2708                         }
2709
2710                 EVP_PKEY_free(clnt_pub_pkey);
2711                 EC_POINT_free(clnt_ecpoint);
2712                 EC_KEY_free(srvr_ecdh);
2713                 BN_CTX_free(bn_ctx);
2714                 EC_KEY_free(s->s3->tmp.ecdh);
2715                 s->s3->tmp.ecdh = NULL;
2716
2717                 /* Compute the master secret */
2718                 s->session->master_key_length = s->method->ssl3_enc-> \
2719                     generate_master_secret(s, s->session->master_key, p, i);
2720
2721                 OPENSSL_cleanse(p, i);
2722                 return (ret);
2723                 }
2724         else
2725 #endif
2726 #ifndef OPENSSL_NO_PSK
2727                 if (alg_k & SSL_kPSK)
2728                         {
2729                         unsigned char *t = NULL;
2730                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2731                         unsigned int pre_ms_len = 0, psk_len = 0;
2732                         int psk_err = 1;
2733                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2734
2735                         al=SSL_AD_HANDSHAKE_FAILURE;
2736
2737                         n2s(p,i);
2738                         if (n != i+2)
2739                                 {
2740                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2741                                         SSL_R_LENGTH_MISMATCH);
2742                                 goto psk_err;
2743                                 }
2744                         if (i > PSK_MAX_IDENTITY_LEN)
2745                                 {
2746                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2747                                         SSL_R_DATA_LENGTH_TOO_LONG);
2748                                 goto psk_err;
2749                                 }
2750                         if (s->psk_server_callback == NULL)
2751                                 {
2752                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2753                                        SSL_R_PSK_NO_SERVER_CB);
2754                                 goto psk_err;
2755                                 }
2756
2757                         /* Create guaranteed NULL-terminated identity
2758                          * string for the callback */
2759                         memcpy(tmp_id, p, i);
2760                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2761                         psk_len = s->psk_server_callback(s, tmp_id,
2762                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2763                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2764
2765                         if (psk_len > PSK_MAX_PSK_LEN)
2766                                 {
2767                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2768                                         ERR_R_INTERNAL_ERROR);
2769                                 goto psk_err;
2770                                 }
2771                         else if (psk_len == 0)
2772                                 {
2773                                 /* PSK related to the given identity not found */
2774                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2775                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2776                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2777                                 goto psk_err;
2778                                 }
2779
2780                         /* create PSK pre_master_secret */
2781                         pre_ms_len=2+psk_len+2+psk_len;
2782                         t = psk_or_pre_ms;
2783                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2784                         s2n(psk_len, t);
2785                         memset(t, 0, psk_len);
2786                         t+=psk_len;
2787                         s2n(psk_len, t);
2788
2789                         if (s->session->psk_identity != NULL)
2790                                 OPENSSL_free(s->session->psk_identity);
2791                         s->session->psk_identity = BUF_strdup((char *)p);
2792                         if (s->session->psk_identity == NULL)
2793                                 {
2794                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2795                                         ERR_R_MALLOC_FAILURE);
2796                                 goto psk_err;
2797                                 }
2798
2799                         if (s->session->psk_identity_hint != NULL)
2800                                 OPENSSL_free(s->session->psk_identity_hint);
2801                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2802                         if (s->ctx->psk_identity_hint != NULL &&
2803                                 s->session->psk_identity_hint == NULL)
2804                                 {
2805                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2806                                         ERR_R_MALLOC_FAILURE);
2807                                 goto psk_err;
2808                                 }
2809
2810                         s->session->master_key_length=
2811                                 s->method->ssl3_enc->generate_master_secret(s,
2812                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2813                         psk_err = 0;
2814                 psk_err:
2815                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2816                         if (psk_err != 0)
2817                                 goto f_err;
2818                         }
2819                 else
2820 #endif
2821 #ifndef OPENSSL_NO_SRP
2822                 if (alg_k & SSL_kSRP)
2823                         {
2824                         int param_len;
2825
2826                         n2s(p,i);
2827                         param_len=i+2;
2828                         if (param_len > n)
2829                                 {
2830                                 al=SSL_AD_DECODE_ERROR;
2831                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2832                                 goto f_err;
2833                                 }
2834                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2835                                 {
2836                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2837                                 goto err;
2838                                 }
2839                         if (s->session->srp_username != NULL)
2840                                 OPENSSL_free(s->session->srp_username);
2841                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2842                         if (s->session->srp_username == NULL)
2843                                 {
2844                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2845                                         ERR_R_MALLOC_FAILURE);
2846                                 goto err;
2847                                 }
2848
2849                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2850                                 {
2851                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2852                                 goto err;
2853                                 }
2854
2855                         p+=i;
2856                         }
2857                 else
2858 #endif  /* OPENSSL_NO_SRP */
2859                 if (alg_k & SSL_kGOST)
2860                         {
2861                         int ret = 0;
2862                         EVP_PKEY_CTX *pkey_ctx;
2863                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2864                         unsigned char premaster_secret[32], *start;
2865                         size_t outlen=32, inlen;
2866                         unsigned long alg_a;
2867
2868                         /* Get our certificate private key*/
2869                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2870                         if (alg_a & SSL_aGOST94)
2871                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2872                         else if (alg_a & SSL_aGOST01)
2873                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2874
2875                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2876                         EVP_PKEY_decrypt_init(pkey_ctx);
2877                         /* If client certificate is present and is of the same type, maybe
2878                          * use it for key exchange.  Don't mind errors from
2879                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2880                          * a client certificate for authorization only. */
2881                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2882                         if (client_pub_pkey)
2883                                 {
2884                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2885                                         ERR_clear_error();
2886                                 }
2887                         /* Decrypt session key */
2888                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED)))
2889                                 {
2890                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2891                                 goto gerr;
2892                                 }
2893                         if (p[1] == 0x81)
2894                                 {
2895                                 start = p+3;
2896                                 inlen = p[2];
2897                                 }
2898                         else if (p[1] < 0x80)
2899                                 {
2900                                 start = p+2;
2901                                 inlen = p[1];
2902                                 }
2903                         else
2904                                 {
2905                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2906                                 goto gerr;
2907                                 }
2908                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
2909
2910                                 {
2911                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2912                                 goto gerr;
2913                                 }
2914                         /* Generate master secret */
2915                         s->session->master_key_length=
2916                                 s->method->ssl3_enc->generate_master_secret(s,
2917                                         s->session->master_key,premaster_secret,32);
2918                         /* Check if pubkey from client certificate was used */
2919                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2920                                 ret = 2;
2921                         else
2922                                 ret = 1;
2923                 gerr:
2924                         EVP_PKEY_free(client_pub_pkey);
2925                         EVP_PKEY_CTX_free(pkey_ctx);
2926                         if (ret)
2927                                 return ret;
2928                         else
2929                                 goto err;
2930                         }
2931                 else
2932                 {
2933                 al=SSL_AD_HANDSHAKE_FAILURE;
2934                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2935                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2936                 goto f_err;
2937                 }
2938
2939         return(1);
2940 f_err:
2941         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2942 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
2943 err:
2944 #endif
2945 #ifndef OPENSSL_NO_ECDH
2946         EVP_PKEY_free(clnt_pub_pkey);
2947         EC_POINT_free(clnt_ecpoint);
2948         if (srvr_ecdh != NULL)
2949                 EC_KEY_free(srvr_ecdh);
2950         BN_CTX_free(bn_ctx);
2951 #endif
2952         return(-1);
2953         }
2954
2955 int ssl3_get_cert_verify(SSL *s)
2956         {
2957         EVP_PKEY *pkey=NULL;
2958         unsigned char *p;
2959         int al,ok,ret=0;
2960         long n;
2961         int type=0,i,j;
2962         X509 *peer;
2963         const EVP_MD *md = NULL;
2964         EVP_MD_CTX mctx;
2965         EVP_MD_CTX_init(&mctx);
2966
2967         n=s->method->ssl_get_message(s,
2968                 SSL3_ST_SR_CERT_VRFY_A,
2969                 SSL3_ST_SR_CERT_VRFY_B,
2970                 -1,
2971                 516, /* Enough for 4096 bit RSA key with TLS v1.2 */
2972                 &ok);
2973
2974         if (!ok) return((int)n);
2975
2976         if (s->session->peer != NULL)
2977                 {
2978                 peer=s->session->peer;
2979                 pkey=X509_get_pubkey(peer);
2980                 type=X509_certificate_type(peer,pkey);
2981                 }
2982         else
2983                 {
2984                 peer=NULL;
2985                 pkey=NULL;
2986                 }
2987
2988         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2989                 {
2990                 s->s3->tmp.reuse_message=1;
2991                 if ((peer != NULL) && (type & EVP_PKT_SIGN))
2992                         {
2993                         al=SSL_AD_UNEXPECTED_MESSAGE;
2994                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2995                         goto f_err;
2996                         }
2997                 ret=1;
2998                 goto end;
2999                 }
3000
3001         if (peer == NULL)
3002                 {
3003                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
3004                 al=SSL_AD_UNEXPECTED_MESSAGE;
3005                 goto f_err;
3006                 }
3007
3008         if (!(type & EVP_PKT_SIGN))
3009                 {
3010                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
3011                 al=SSL_AD_ILLEGAL_PARAMETER;
3012                 goto f_err;
3013                 }
3014
3015         if (s->s3->change_cipher_spec)
3016                 {
3017                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
3018                 al=SSL_AD_UNEXPECTED_MESSAGE;
3019                 goto f_err;
3020                 }
3021
3022         /* we now have a signature that we need to verify */
3023         p=(unsigned char *)s->init_msg;
3024         /* Check for broken implementations of GOST ciphersuites */
3025         /* If key is GOST and n is exactly 64, it is bare
3026          * signature without length field */
3027         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
3028                 pkey->type == NID_id_GostR3410_2001) )
3029                 {
3030                 i=64;
3031                 }
3032         else
3033                 {
3034                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
3035                         {
3036                         int sigalg = tls12_get_sigid(pkey);
3037                         /* Should never happen */
3038                         if (sigalg == -1)
3039                                 {
3040                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3041                                 al=SSL_AD_INTERNAL_ERROR;
3042                                 goto f_err;
3043                                 }
3044                         /* Check key type is consistent with signature */
3045                         if (sigalg != (int)p[1])
3046                                 {
3047                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_TYPE);
3048                                 al=SSL_AD_DECODE_ERROR;
3049                                 goto f_err;
3050                                 }
3051                         md = tls12_get_hash(p[0]);
3052                         if (md == NULL)
3053                                 {
3054                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_UNKNOWN_DIGEST);
3055                                 al=SSL_AD_DECODE_ERROR;
3056                                 goto f_err;
3057                                 }
3058 #ifdef SSL_DEBUG
3059 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3060 #endif
3061                         p += 2;
3062                         n -= 2;
3063                         }
3064                 n2s(p,i);
3065                 n-=2;
3066                 if (i > n)
3067                         {
3068                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3069                         al=SSL_AD_DECODE_ERROR;
3070                         goto f_err;
3071                         }
3072         }
3073         j=EVP_PKEY_size(pkey);
3074         if ((i > j) || (n > j) || (n <= 0))
3075                 {
3076                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3077                 al=SSL_AD_DECODE_ERROR;
3078                 goto f_err;
3079                 }
3080
3081         if (TLS1_get_version(s) >= TLS1_2_VERSION)
3082                 {
3083                 long hdatalen = 0;
3084                 void *hdata;
3085                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3086                 if (hdatalen <= 0)
3087                         {
3088                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3089                         al=SSL_AD_INTERNAL_ERROR;
3090                         goto f_err;
3091                         }
3092 #ifdef SSL_DEBUG
3093                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3094                                                         EVP_MD_name(md));
3095 #endif
3096                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3097                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3098                         {
3099                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3100                         al=SSL_AD_INTERNAL_ERROR;
3101                         goto f_err;
3102                         }
3103
3104                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3105                         {
3106                         al=SSL_AD_DECRYPT_ERROR;
3107                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3108                         goto f_err;
3109                         }
3110                 }
3111         else
3112 #ifndef OPENSSL_NO_RSA
3113         if (pkey->type == EVP_PKEY_RSA)
3114                 {
3115                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3116                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
3117                                                         pkey->pkey.rsa);
3118                 if (i < 0)
3119                         {
3120                         al=SSL_AD_DECRYPT_ERROR;
3121                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3122                         goto f_err;
3123                         }
3124                 if (i == 0)
3125                         {
3126                         al=SSL_AD_DECRYPT_ERROR;
3127                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3128                         goto f_err;
3129                         }
3130                 }
3131         else
3132 #endif
3133 #ifndef OPENSSL_NO_DSA
3134                 if (pkey->type == EVP_PKEY_DSA)
3135                 {
3136                 j=DSA_verify(pkey->save_type,
3137                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3138                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3139                 if (j <= 0)
3140                         {
3141                         /* bad signature */
3142                         al=SSL_AD_DECRYPT_ERROR;
3143                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3144                         goto f_err;
3145                         }
3146                 }
3147         else
3148 #endif
3149 #ifndef OPENSSL_NO_ECDSA
3150                 if (pkey->type == EVP_PKEY_EC)
3151                 {
3152                 j=ECDSA_verify(pkey->save_type,
3153                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3154                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3155                 if (j <= 0)
3156                         {
3157                         /* bad signature */
3158                         al=SSL_AD_DECRYPT_ERROR;
3159                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3160                             SSL_R_BAD_ECDSA_SIGNATURE);
3161                         goto f_err;
3162                         }
3163                 }
3164         else
3165 #endif
3166         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3167                 {   unsigned char signature[64];
3168                         int idx;
3169                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3170                         EVP_PKEY_verify_init(pctx);
3171                         if (i!=64) {
3172                                 fprintf(stderr,"GOST signature length is %d",i);
3173                         }
3174                         for (idx=0;idx<64;idx++) {
3175                                 signature[63-idx]=p[idx];
3176                         }
3177                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3178                         EVP_PKEY_CTX_free(pctx);
3179                         if (j<=0)
3180                                 {
3181                                 al=SSL_AD_DECRYPT_ERROR;
3182                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3183                                         SSL_R_BAD_ECDSA_SIGNATURE);
3184                                 goto f_err;
3185                                 }
3186                 }
3187         else
3188                 {
3189                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3190                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3191                 goto f_err;
3192                 }
3193
3194
3195         ret=1;
3196         if (0)
3197                 {
3198 f_err:
3199                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3200                 }
3201 end:
3202         if (s->s3->handshake_buffer)
3203                 {
3204                 BIO_free(s->s3->handshake_buffer);
3205                 s->s3->handshake_buffer = NULL;
3206                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3207                 }
3208         EVP_MD_CTX_cleanup(&mctx);
3209         EVP_PKEY_free(pkey);
3210         return(ret);
3211         }
3212
3213 int ssl3_get_client_certificate(SSL *s)
3214         {
3215         int i,ok,al,ret= -1;
3216         X509 *x=NULL;
3217         unsigned long l,nc,llen,n;
3218         const unsigned char *p,*q;
3219         unsigned char *d;
3220         STACK_OF(X509) *sk=NULL;
3221
3222         n=s->method->ssl_get_message(s,
3223                 SSL3_ST_SR_CERT_A,
3224                 SSL3_ST_SR_CERT_B,
3225                 -1,
3226                 s->max_cert_list,
3227                 &ok);
3228
3229         if (!ok) return((int)n);
3230
3231         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3232                 {
3233                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3234                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3235                         {
3236                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3237                         al=SSL_AD_HANDSHAKE_FAILURE;
3238                         goto f_err;
3239                         }
3240                 /* If tls asked for a client cert, the client must return a 0 list */
3241                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3242                         {
3243                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3244                         al=SSL_AD_UNEXPECTED_MESSAGE;
3245                         goto f_err;
3246                         }
3247                 s->s3->tmp.reuse_message=1;
3248                 return(1);
3249                 }
3250
3251         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3252                 {
3253                 al=SSL_AD_UNEXPECTED_MESSAGE;
3254                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3255                 goto f_err;
3256                 }
3257         p=d=(unsigned char *)s->init_msg;
3258
3259         if ((sk=sk_X509_new_null()) == NULL)
3260                 {
3261                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3262                 goto err;
3263                 }
3264
3265         n2l3(p,llen);
3266         if (llen+3 != n)
3267                 {
3268                 al=SSL_AD_DECODE_ERROR;
3269                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3270                 goto f_err;
3271                 }
3272         for (nc=0; nc<llen; )
3273                 {
3274                 n2l3(p,l);
3275                 if ((l+nc+3) > llen)
3276                         {
3277                         al=SSL_AD_DECODE_ERROR;
3278                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3279                         goto f_err;
3280                         }
3281
3282                 q=p;
3283                 x=d2i_X509(NULL,&p,l);
3284                 if (x == NULL)
3285                         {
3286                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3287                         goto err;
3288                         }
3289                 if (p != (q+l))
3290                         {
3291                         al=SSL_AD_DECODE_ERROR;
3292                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3293                         goto f_err;
3294                         }
3295                 if (!sk_X509_push(sk,x))
3296                         {
3297                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3298                         goto err;
3299                         }
3300                 x=NULL;
3301                 nc+=l+3;
3302                 }
3303
3304         if (sk_X509_num(sk) <= 0)
3305                 {
3306                 /* TLS does not mind 0 certs returned */
3307                 if (s->version == SSL3_VERSION)
3308                         {
3309                         al=SSL_AD_HANDSHAKE_FAILURE;
3310                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3311                         goto f_err;
3312                         }
3313                 /* Fail for TLS only if we required a certificate */
3314                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3315                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3316                         {
3317                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3318                         al=SSL_AD_HANDSHAKE_FAILURE;
3319                         goto f_err;
3320                         }
3321                 /* No client certificate so digest cached records */
3322                 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s))
3323                         {
3324                         al=SSL_AD_INTERNAL_ERROR;
3325                         goto f_err;
3326                         }
3327                 }
3328         else
3329                 {
3330                 i=ssl_verify_cert_chain(s,sk);
3331                 if (i <= 0)
3332                         {
3333                         al=ssl_verify_alarm_type(s->verify_result);
3334                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
3335                         goto f_err;
3336                         }
3337                 }
3338
3339         if (s->session->peer != NULL) /* This should not be needed */
3340                 X509_free(s->session->peer);
3341         s->session->peer=sk_X509_shift(sk);
3342         s->session->verify_result = s->verify_result;
3343
3344         /* With the current implementation, sess_cert will always be NULL
3345          * when we arrive here. */
3346         if (s->session->sess_cert == NULL)
3347                 {
3348                 s->session->sess_cert = ssl_sess_cert_new();
3349                 if (s->session->sess_cert == NULL)
3350                         {
3351                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3352                         goto err;
3353                         }
3354                 }
3355         if (s->session->sess_cert->cert_chain != NULL)
3356                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3357         s->session->sess_cert->cert_chain=sk;
3358         /* Inconsistency alert: cert_chain does *not* include the
3359          * peer's own certificate, while we do include it in s3_clnt.c */
3360
3361         sk=NULL;
3362
3363         ret=1;
3364         if (0)
3365                 {
3366 f_err:
3367                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3368                 }
3369 err:
3370         if (x != NULL) X509_free(x);
3371         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3372         return(ret);
3373         }
3374
3375 int ssl3_send_server_certificate(SSL *s)
3376         {
3377         unsigned long l;
3378         CERT_PKEY *cpk;
3379
3380         if (s->state == SSL3_ST_SW_CERT_A)
3381                 {
3382                 cpk=ssl_get_server_send_pkey(s);
3383                 if (cpk == NULL)
3384                         {
3385                         /* VRS: allow null cert if auth == KRB5 */
3386                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3387                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3388                                 {
3389                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3390                                 return(0);
3391                                 }
3392                         }
3393
3394                 l=ssl3_output_cert_chain(s,cpk);
3395                 s->state=SSL3_ST_SW_CERT_B;
3396                 s->init_num=(int)l;
3397                 s->init_off=0;
3398                 }
3399
3400         /* SSL3_ST_SW_CERT_B */
3401         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3402         }
3403
3404 #ifndef OPENSSL_NO_TLSEXT
3405 /* send a new session ticket (not necessarily for a new session) */
3406 int ssl3_send_newsession_ticket(SSL *s)
3407         {
3408         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3409                 {
3410                 unsigned char *p, *senc, *macstart;
3411                 const unsigned char *const_p;
3412                 int len, slen_full, slen;
3413                 SSL_SESSION *sess;
3414                 unsigned int hlen;
3415                 EVP_CIPHER_CTX ctx;
3416                 HMAC_CTX hctx;
3417                 SSL_CTX *tctx = s->initial_ctx;
3418                 unsigned char iv[EVP_MAX_IV_LENGTH];
3419                 unsigned char key_name[16];
3420
3421                 /* get session encoding length */
3422                 slen_full = i2d_SSL_SESSION(s->session, NULL);
3423                 /* Some length values are 16 bits, so forget it if session is
3424                  * too long
3425                  */
3426                 if (slen_full > 0xFF00)
3427                         return -1;
3428                 senc = OPENSSL_malloc(slen_full);
3429                 if (!senc)
3430                         return -1;
3431                 p = senc;
3432                 i2d_SSL_SESSION(s->session, &p);
3433
3434                 /* create a fresh copy (not shared with other threads) to clean up */
3435                 const_p = senc;
3436                 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3437                 if (sess == NULL)
3438                         {
3439                         OPENSSL_free(senc);
3440                         return -1;
3441                         }
3442                 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
3443
3444                 slen = i2d_SSL_SESSION(sess, NULL);
3445                 if (slen > slen_full) /* shouldn't ever happen */
3446                         {
3447                         OPENSSL_free(senc);
3448                         return -1;
3449                         }
3450                 p = senc;
3451                 i2d_SSL_SESSION(sess, &p);
3452                 SSL_SESSION_free(sess);
3453
3454                 /* Grow buffer if need be: the length calculation is as
3455                  * follows 1 (size of message name) + 3 (message length
3456                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
3457                  * 16 (key name) + max_iv_len (iv length) +
3458                  * session_length + max_enc_block_size (max encrypted session
3459                  * length) + max_md_size (HMAC).
3460                  */
3461                 if (!BUF_MEM_grow(s->init_buf,
3462                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
3463                         EVP_MAX_MD_SIZE + slen))
3464                         return -1;
3465
3466                 p=(unsigned char *)s->init_buf->data;
3467                 /* do the header */
3468                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
3469                 /* Skip message length for now */
3470                 p += 3;
3471                 EVP_CIPHER_CTX_init(&ctx);
3472                 HMAC_CTX_init(&hctx);
3473                 /* Initialize HMAC and cipher contexts. If callback present
3474                  * it does all the work otherwise use generated values
3475                  * from parent ctx.
3476                  */
3477                 if (tctx->tlsext_ticket_key_cb)
3478                         {
3479                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3480                                                          &hctx, 1) < 0)
3481                                 {
3482                                 OPENSSL_free(senc);
3483                                 return -1;
3484                                 }
3485                         }
3486                 else
3487                         {
3488                         RAND_pseudo_bytes(iv, 16);
3489                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3490                                         tctx->tlsext_tick_aes_key, iv);
3491                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3492                                         tlsext_tick_md(), NULL);
3493                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3494                         }
3495
3496                 /* Ticket lifetime hint (advisory only):
3497                  * We leave this unspecified for resumed session (for simplicity),
3498                  * and guess that tickets for new sessions will live as long
3499                  * as their sessions. */
3500                 l2n(s->hit ? 0 : s->session->timeout, p);
3501
3502                 /* Skip ticket length for now */
3503                 p += 2;
3504                 /* Output key name */
3505                 macstart = p;
3506                 memcpy(p, key_name, 16);
3507                 p += 16;
3508                 /* output IV */
3509                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3510                 p += EVP_CIPHER_CTX_iv_length(&ctx);
3511                 /* Encrypt session data */
3512                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3513                 p += len;
3514                 EVP_EncryptFinal(&ctx, p, &len);
3515                 p += len;
3516                 EVP_CIPHER_CTX_cleanup(&ctx);
3517
3518                 HMAC_Update(&hctx, macstart, p - macstart);
3519                 HMAC_Final(&hctx, p, &hlen);
3520                 HMAC_CTX_cleanup(&hctx);
3521
3522                 p += hlen;
3523                 /* Now write out lengths: p points to end of data written */
3524                 /* Total length */
3525                 len = p - (unsigned char *)s->init_buf->data;
3526                 p=(unsigned char *)s->init_buf->data + 1;
3527                 l2n3(len - 4, p); /* Message length */
3528                 p += 4;
3529                 s2n(len - 10, p);  /* Ticket length */
3530
3531                 /* number of bytes to write */
3532                 s->init_num= len;
3533                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3534                 s->init_off=0;
3535                 OPENSSL_free(senc);
3536                 }
3537
3538         /* SSL3_ST_SW_SESSION_TICKET_B */
3539         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3540         }
3541
3542 int ssl3_send_cert_status(SSL *s)
3543         {
3544         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3545                 {
3546                 unsigned char *p;
3547                 /* Grow buffer if need be: the length calculation is as
3548                  * follows 1 (message type) + 3 (message length) +
3549                  * 1 (ocsp response type) + 3 (ocsp response length)
3550                  * + (ocsp response)
3551                  */
3552                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3553                         return -1;
3554
3555                 p=(unsigned char *)s->init_buf->data;
3556
3557                 /* do the header */
3558                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3559                 /* message length */
3560                 l2n3(s->tlsext_ocsp_resplen + 4, p);
3561                 /* status type */
3562                 *(p++)= s->tlsext_status_type;
3563                 /* length of OCSP response */
3564                 l2n3(s->tlsext_ocsp_resplen, p);
3565                 /* actual response */
3566                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3567                 /* number of bytes to write */
3568                 s->init_num = 8 + s->tlsext_ocsp_resplen;
3569                 s->state=SSL3_ST_SW_CERT_STATUS_B;
3570                 s->init_off = 0;
3571                 }
3572
3573         /* SSL3_ST_SW_CERT_STATUS_B */
3574         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3575         }
3576
3577 # ifndef OPENSSL_NO_NPN
3578 /* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It
3579  * sets the next_proto member in s if found */
3580 int ssl3_get_next_proto(SSL *s)
3581         {
3582         int ok;
3583         int proto_len, padding_len;
3584         long n;
3585         const unsigned char *p;
3586
3587         /* Clients cannot send a NextProtocol message if we didn't see the
3588          * extension in their ClientHello */
3589         if (!s->s3->next_proto_neg_seen)
3590                 {
3591                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION);
3592                 return -1;
3593                 }
3594
3595         n=s->method->ssl_get_message(s,
3596                 SSL3_ST_SR_NEXT_PROTO_A,
3597                 SSL3_ST_SR_NEXT_PROTO_B,
3598                 SSL3_MT_NEXT_PROTO,
3599                 514,  /* See the payload format below */
3600                 &ok);
3601
3602         if (!ok)
3603                 return((int)n);
3604
3605         /* s->state doesn't reflect whether ChangeCipherSpec has been received
3606          * in this handshake, but s->s3->change_cipher_spec does (will be reset
3607          * by ssl3_get_finished). */
3608         if (!s->s3->change_cipher_spec)
3609                 {
3610                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS);
3611                 return -1;
3612                 }
3613
3614         if (n < 2)
3615                 return 0;  /* The body must be > 1 bytes long */
3616
3617         p=(unsigned char *)s->init_msg;
3618
3619         /* The payload looks like:
3620          *   uint8 proto_len;
3621          *   uint8 proto[proto_len];
3622          *   uint8 padding_len;
3623          *   uint8 padding[padding_len];
3624          */
3625         proto_len = p[0];
3626         if (proto_len + 2 > s->init_num)
3627                 return 0;
3628         padding_len = p[proto_len + 1];
3629         if (proto_len + padding_len + 2 != s->init_num)
3630                 return 0;
3631
3632         s->next_proto_negotiated = OPENSSL_malloc(proto_len);
3633         if (!s->next_proto_negotiated)
3634                 {
3635                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,ERR_R_MALLOC_FAILURE);
3636                 return 0;
3637                 }
3638         memcpy(s->next_proto_negotiated, p + 1, proto_len);
3639         s->next_proto_negotiated_len = proto_len;
3640
3641         return 1;
3642         }
3643 # endif
3644 #endif