crypto/openssl/ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124 /* ====================================================================
 125  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 133  * support (see RFC 4279) to OpenSSL.
 134  *
 135  * No patent licenses or other rights except those expressly stated in
 136  * the OpenSSL open source license shall be deemed granted or received
 137  * expressly, by implication, estoppel, or otherwise.
 138  *
 139  * No assurances are provided by Nokia that the Contribution does not
 140  * infringe the patent or other intellectual property rights of any third
 141  * party or that the license provides you with all the necessary rights
 142  * to make use of the Contribution.
 143  *
 144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 148  * OTHERWISE.
 149  */
 150
 151 #define REUSE_CIPHER_BUG
 152 #define NETSCAPE_HANG_BUG
 153
 154 #include <stdio.h>
 155 #include "ssl_locl.h"
 156 #include "kssl_lcl.h"
 157 #include <openssl/buffer.h>
 158 #include <openssl/rand.h>
 159 #include <openssl/objects.h>
 160 #include <openssl/evp.h>
 161 #include <openssl/hmac.h>
 162 #include <openssl/x509.h>
 163 #ifndef OPENSSL_NO_DH
 164 #include <openssl/dh.h>
 165 #endif
 166 #include <openssl/bn.h>
 167 #ifndef OPENSSL_NO_KRB5
 168 #include <openssl/krb5_asn.h>
 169 #endif
 170 #include <openssl/md5.h>
 171
 172 static const SSL_METHOD *ssl3_get_server_method(int ver);
 173
 174 static const SSL_METHOD *ssl3_get_server_method(int ver)
 175         {
 176         if (ver == SSL3_VERSION)
 177                 return(SSLv3_server_method());
 178         else
 179                 return(NULL);
 180         }
 181
 182 #ifndef OPENSSL_NO_SRP
 183 static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
 184         {
 185         int ret = SSL_ERROR_NONE;
 186
 187         *al = SSL_AD_UNRECOGNIZED_NAME;
 188
 189         if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
 190             (s->srp_ctx.TLS_ext_srp_username_callback != NULL))
 191                 {
 192                 if(s->srp_ctx.login == NULL)
 193                         {
 194                         /* RFC 5054 says SHOULD reject,
 195                            we do so if There is no srp login name */
 196                         ret = SSL3_AL_FATAL;
 197                         *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
 198                         }
 199                 else
 200                         {
 201                         ret = SSL_srp_server_param_with_username(s,al);
 202                         }
 203                 }
 204         return ret;
 205         }
 206 #endif
 207
 208 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
 209                         ssl3_accept,
 210                         ssl_undefined_function,
 211                         ssl3_get_server_method)
 212
 213 int ssl3_accept(SSL *s)
 214         {
 215         BUF_MEM *buf;
 216         unsigned long alg_k,Time=(unsigned long)time(NULL);
 217         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 218         int ret= -1;
 219         int new_state,state,skip=0;
 220
 221         RAND_add(&Time,sizeof(Time),0);
 222         ERR_clear_error();
 223         clear_sys_error();
 224
 225         if (s->info_callback != NULL)
 226                 cb=s->info_callback;
 227         else if (s->ctx->info_callback != NULL)
 228                 cb=s->ctx->info_callback;
 229
 230         /* init things to blank */
 231         s->in_handshake++;
 232         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 233
 234         if (s->cert == NULL)
 235                 {
 236                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 237                 return(-1);
 238                 }
 239
 240 #ifndef OPENSSL_NO_HEARTBEATS
 241         /* If we're awaiting a HeartbeatResponse, pretend we
 242          * already got and don't await it anymore, because
 243          * Heartbeats don't make sense during handshakes anyway.
 244          */
 245         if (s->tlsext_hb_pending)
 246                 {
 247                 s->tlsext_hb_pending = 0;
 248                 s->tlsext_hb_seq++;
 249                 }
 250 #endif
 251
 252         for (;;)
 253                 {
 254                 state=s->state;
 255
 256                 switch (s->state)
 257                         {
 258                 case SSL_ST_RENEGOTIATE:
 259                         s->renegotiate=1;
 260                         /* s->state=SSL_ST_ACCEPT; */
 261
 262                 case SSL_ST_BEFORE:
 263                 case SSL_ST_ACCEPT:
 264                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 265                 case SSL_ST_OK|SSL_ST_ACCEPT:
 266
 267                         s->server=1;
 268                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 269
 270                         if ((s->version>>8) != 3)
 271                                 {
 272                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 273                                 return -1;
 274                                 }
 275                         s->type=SSL_ST_ACCEPT;
 276
 277                         if (s->init_buf == NULL)
 278                                 {
 279                                 if ((buf=BUF_MEM_new()) == NULL)
 280                                         {
 281                                         ret= -1;
 282                                         goto end;
 283                                         }
 284                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 285                                         {
 286                                         ret= -1;
 287                                         goto end;
 288                                         }
 289                                 s->init_buf=buf;
 290                                 }
 291
 292                         if (!ssl3_setup_buffers(s))
 293                                 {
 294                                 ret= -1;
 295                                 goto end;
 296                                 }
 297
 298                         s->init_num=0;
 299                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
 300
 301                         if (s->state != SSL_ST_RENEGOTIATE)
 302                                 {
 303                                 /* Ok, we now need to push on a buffering BIO so that
 304                                  * the output is sent in a way that TCP likes :-)
 305                                  */
 306                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 307
 308                                 ssl3_init_finished_mac(s);
 309                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 310                                 s->ctx->stats.sess_accept++;
 311                                 }
 312                         else if (!s->s3->send_connection_binding &&
 313                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
 314                                 {
 315                                 /* Server attempting to renegotiate with
 316                                  * client that doesn't support secure
 317                                  * renegotiation.
 318                                  */
 319                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
 320                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 321                                 ret = -1;
 322                                 goto end;
 323                                 }
 324                         else
 325                                 {
 326                                 /* s->state == SSL_ST_RENEGOTIATE,
 327                                  * we will just send a HelloRequest */
 328                                 s->ctx->stats.sess_accept_renegotiate++;
 329                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 330                                 }
 331                         break;
 332
 333                 case SSL3_ST_SW_HELLO_REQ_A:
 334                 case SSL3_ST_SW_HELLO_REQ_B:
 335
 336                         s->shutdown=0;
 337                         ret=ssl3_send_hello_request(s);
 338                         if (ret <= 0) goto end;
 339                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 340                         s->state=SSL3_ST_SW_FLUSH;
 341                         s->init_num=0;
 342
 343                         ssl3_init_finished_mac(s);
 344                         break;
 345
 346                 case SSL3_ST_SW_HELLO_REQ_C:
 347                         s->state=SSL_ST_OK;
 348                         break;
 349
 350                 case SSL3_ST_SR_CLNT_HELLO_A:
 351                 case SSL3_ST_SR_CLNT_HELLO_B:
 352                 case SSL3_ST_SR_CLNT_HELLO_C:
 353
 354                         s->shutdown=0;
 355                         if (s->rwstate != SSL_X509_LOOKUP)
 356                         {
 357                                 ret=ssl3_get_client_hello(s);
 358                                 if (ret <= 0) goto end;
 359                         }
 360 #ifndef OPENSSL_NO_SRP
 361                         {
 362                         int al;
 363                         if ((ret = ssl_check_srp_ext_ClientHello(s,&al))  < 0)
 364                                         {
 365                                         /* callback indicates firther work to be done */
 366                                         s->rwstate=SSL_X509_LOOKUP;
 367                                         goto end;
 368                                         }
 369                         if (ret != SSL_ERROR_NONE)
 370                                 {
 371                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 372                                 /* This is not really an error but the only means to
 373                                    for a client to detect whether srp is supported. */
 374                                    if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)
 375                                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);
 376                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
 377                                 ret= -1;
 378                                 goto end;
 379                                 }
 380                         }
 381 #endif
 382
 383                         s->renegotiate = 2;
 384                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 385                         s->init_num=0;
 386                         break;
 387
 388                 case SSL3_ST_SW_SRVR_HELLO_A:
 389                 case SSL3_ST_SW_SRVR_HELLO_B:
 390                         ret=ssl3_send_server_hello(s);
 391                         if (ret <= 0) goto end;
 392 #ifndef OPENSSL_NO_TLSEXT
 393                         if (s->hit)
 394                                 {
 395                                 if (s->tlsext_ticket_expected)
 396                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 397                                 else
 398                                         s->state=SSL3_ST_SW_CHANGE_A;
 399                                 }
 400 #else
 401                         if (s->hit)
 402                                         s->state=SSL3_ST_SW_CHANGE_A;
 403 #endif
 404                         else
 405                                 s->state=SSL3_ST_SW_CERT_A;
 406                         s->init_num=0;
 407                         break;
 408
 409                 case SSL3_ST_SW_CERT_A:
 410                 case SSL3_ST_SW_CERT_B:
 411                         /* Check if it is anon DH or anon ECDH, */
 412                         /* normal PSK or KRB5 or SRP */
 413                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
 414                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
 415                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
 416                                 {
 417                                 ret=ssl3_send_server_certificate(s);
 418                                 if (ret <= 0) goto end;
 419 #ifndef OPENSSL_NO_TLSEXT
 420                                 if (s->tlsext_status_expected)
 421                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 422                                 else
 423                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 424                                 }
 425                         else
 426                                 {
 427                                 skip = 1;
 428                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 429                                 }
 430 #else
 431                                 }
 432                         else
 433                                 skip=1;
 434
 435                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 436 #endif
 437                         s->init_num=0;
 438                         break;
 439
 440                 case SSL3_ST_SW_KEY_EXCH_A:
 441                 case SSL3_ST_SW_KEY_EXCH_B:
 442                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 443
 444                         /* clear this, it may get reset by
 445                          * send_server_key_exchange */
 446                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 447 #ifndef OPENSSL_NO_KRB5
 448                                 && !(alg_k & SSL_kKRB5)
 449 #endif /* OPENSSL_NO_KRB5 */
 450                                 )
 451                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 452                                  * even when forbidden by protocol specs
 453                                  * (handshake may fail as clients are not required to
 454                                  * be able to handle this) */
 455                                 s->s3->tmp.use_rsa_tmp=1;
 456                         else
 457                                 s->s3->tmp.use_rsa_tmp=0;
 458
 459
 460                         /* only send if a DH key exchange, fortezza or
 461                          * RSA but we have a sign only certificate
 462                          *
 463                          * PSK: may send PSK identity hints
 464                          *
 465                          * For ECC ciphersuites, we send a serverKeyExchange
 466                          * message only if the cipher suite is either
 467                          * ECDH-anon or ECDHE. In other cases, the
 468                          * server certificate contains the server's
 469                          * public key for key exchange.
 470                          */
 471                         if (s->s3->tmp.use_rsa_tmp
 472                         /* PSK: send ServerKeyExchange if PSK identity
 473                          * hint if provided */
 474 #ifndef OPENSSL_NO_PSK
 475                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 476 #endif
 477 #ifndef OPENSSL_NO_SRP
 478                             /* SRP: send ServerKeyExchange */
 479                             || (alg_k & SSL_kSRP)
 480 #endif
 481                             || (alg_k & (SSL_kDHr|SSL_kDHd|SSL_kEDH))
 482                             || (alg_k & SSL_kEECDH)
 483                             || ((alg_k & SSL_kRSA)
 484                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 485                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 486                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 487                                         )
 488                                     )
 489                                 )
 490                             )
 491                                 {
 492                                 ret=ssl3_send_server_key_exchange(s);
 493                                 if (ret <= 0) goto end;
 494                                 }
 495                         else
 496                                 skip=1;
 497
 498                         s->state=SSL3_ST_SW_CERT_REQ_A;
 499                         s->init_num=0;
 500                         break;
 501
 502                 case SSL3_ST_SW_CERT_REQ_A:
 503                 case SSL3_ST_SW_CERT_REQ_B:
 504                         if (/* don't request cert unless asked for it: */
 505                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 506                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 507                                  * don't request cert during re-negotiation: */
 508                                 ((s->session->peer != NULL) &&
 509                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 510                                 /* never request cert in anonymous ciphersuites
 511                                  * (see section "Certificate request" in SSL 3 drafts
 512                                  * and in RFC 2246): */
 513                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 514                                  /* ... except when the application insists on verification
 515                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 516                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 517                                  /* never request cert in Kerberos ciphersuites */
 518                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
 519                                 /* With normal PSK Certificates and
 520                                  * Certificate Requests are omitted */
 521                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 522                                 {
 523                                 /* no cert request */
 524                                 skip=1;
 525                                 s->s3->tmp.cert_request=0;
 526                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 527                                 if (s->s3->handshake_buffer)
 528                                         if (!ssl3_digest_cached_records(s))
 529                                                 return -1;
 530                                 }
 531                         else
 532                                 {
 533                                 s->s3->tmp.cert_request=1;
 534                                 ret=ssl3_send_certificate_request(s);
 535                                 if (ret <= 0) goto end;
 536 #ifndef NETSCAPE_HANG_BUG
 537                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 538 #else
 539                                 s->state=SSL3_ST_SW_FLUSH;
 540                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 541 #endif
 542                                 s->init_num=0;
 543                                 }
 544                         break;
 545
 546                 case SSL3_ST_SW_SRVR_DONE_A:
 547                 case SSL3_ST_SW_SRVR_DONE_B:
 548                         ret=ssl3_send_server_done(s);
 549                         if (ret <= 0) goto end;
 550                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 551                         s->state=SSL3_ST_SW_FLUSH;
 552                         s->init_num=0;
 553                         break;
 554
 555                 case SSL3_ST_SW_FLUSH:
 556
 557                         /* This code originally checked to see if
 558                          * any data was pending using BIO_CTRL_INFO
 559                          * and then flushed. This caused problems
 560                          * as documented in PR#1939. The proposed
 561                          * fix doesn't completely resolve this issue
 562                          * as buggy implementations of BIO_CTRL_PENDING
 563                          * still exist. So instead we just flush
 564                          * unconditionally.
 565                          */
 566
 567                         s->rwstate=SSL_WRITING;
 568                         if (BIO_flush(s->wbio) <= 0)
 569                                 {
 570                                 ret= -1;
 571                                 goto end;
 572                                 }
 573                         s->rwstate=SSL_NOTHING;
 574
 575                         s->state=s->s3->tmp.next_state;
 576                         break;
 577
 578                 case SSL3_ST_SR_CERT_A:
 579                 case SSL3_ST_SR_CERT_B:
 580                         /* Check for second client hello (MS SGC) */
 581                         ret = ssl3_check_client_hello(s);
 582                         if (ret <= 0)
 583                                 goto end;
 584                         if (ret == 2)
 585                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 586                         else {
 587                                 if (s->s3->tmp.cert_request)
 588                                         {
 589                                         ret=ssl3_get_client_certificate(s);
 590                                         if (ret <= 0) goto end;
 591                                         }
 592                                 s->init_num=0;
 593                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 594                         }
 595                         break;
 596
 597                 case SSL3_ST_SR_KEY_EXCH_A:
 598                 case SSL3_ST_SR_KEY_EXCH_B:
 599                         ret=ssl3_get_client_key_exchange(s);
 600                         if (ret <= 0)
 601                                 goto end;
 602                         if (ret == 2)
 603                                 {
 604                                 /* For the ECDH ciphersuites when
 605                                  * the client sends its ECDH pub key in
 606                                  * a certificate, the CertificateVerify
 607                                  * message is not sent.
 608                                  * Also for GOST ciphersuites when
 609                                  * the client uses its key from the certificate
 610                                  * for key exchange.
 611                                  */
 612 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 613                                 s->state=SSL3_ST_SR_FINISHED_A;
 614 #else
 615                                 if (s->s3->next_proto_neg_seen)
 616                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
 617                                 else
 618                                         s->state=SSL3_ST_SR_FINISHED_A;
 619 #endif
 620                                 s->init_num = 0;
 621                                 }
 622                         else if (TLS1_get_version(s) >= TLS1_2_VERSION)
 623                                 {
 624                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 625                                 s->init_num=0;
 626                                 if (!s->session->peer)
 627                                         break;
 628                                 /* For TLS v1.2 freeze the handshake buffer
 629                                  * at this point and digest cached records.
 630                                  */
 631                                 if (!s->s3->handshake_buffer)
 632                                         {
 633                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
 634                                         return -1;
 635                                         }
 636                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
 637                                 if (!ssl3_digest_cached_records(s))
 638                                         return -1;
 639                                 }
 640                         else
 641                                 {
 642                                 int offset=0;
 643                                 int dgst_num;
 644
 645                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 646                                 s->init_num=0;
 647
 648                                 /* We need to get hashes here so if there is
 649                                  * a client cert, it can be verified
 650                                  * FIXME - digest processing for CertificateVerify
 651                                  * should be generalized. But it is next step
 652                                  */
 653                                 if (s->s3->handshake_buffer)
 654                                         if (!ssl3_digest_cached_records(s))
 655                                                 return -1;
 656                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
 657                                         if (s->s3->handshake_dgst[dgst_num])
 658                                                 {
 659                                                 int dgst_size;
 660
 661                                                 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]));
 662                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
 663                                                 if (dgst_size < 0)
 664                                                         {
 665                                                         ret = -1;
 666                                                         goto end;
 667                                                         }
 668                                                 offset+=dgst_size;
 669                                                 }
 670                                 }
 671                         break;
 672
 673                 case SSL3_ST_SR_CERT_VRFY_A:
 674                 case SSL3_ST_SR_CERT_VRFY_B:
 675
 676                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 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                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 705                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 706                                 SSL3_ST_SR_FINISHED_B);
 707                         if (ret <= 0) goto end;
 708                         if (s->hit)
 709                                 s->state=SSL_ST_OK;
 710 #ifndef OPENSSL_NO_TLSEXT
 711                         else if (s->tlsext_ticket_expected)
 712                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 713 #endif
 714                         else
 715                                 s->state=SSL3_ST_SW_CHANGE_A;
 716                         s->init_num=0;
 717                         break;
 718
 719 #ifndef OPENSSL_NO_TLSEXT
 720                 case SSL3_ST_SW_SESSION_TICKET_A:
 721                 case SSL3_ST_SW_SESSION_TICKET_B:
 722                         ret=ssl3_send_newsession_ticket(s);
 723                         if (ret <= 0) goto end;
 724                         s->state=SSL3_ST_SW_CHANGE_A;
 725                         s->init_num=0;
 726                         break;
 727
 728                 case SSL3_ST_SW_CERT_STATUS_A:
 729                 case SSL3_ST_SW_CERT_STATUS_B:
 730                         ret=ssl3_send_cert_status(s);
 731                         if (ret <= 0) goto end;
 732                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 733                         s->init_num=0;
 734                         break;
 735
 736 #endif
 737
 738                 case SSL3_ST_SW_CHANGE_A:
 739                 case SSL3_ST_SW_CHANGE_B:
 740
 741                         s->session->cipher=s->s3->tmp.new_cipher;
 742                         if (!s->method->ssl3_enc->setup_key_block(s))
 743                                 { ret= -1; goto end; }
 744
 745                         ret=ssl3_send_change_cipher_spec(s,
 746                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 747
 748                         if (ret <= 0) goto end;
 749                         s->state=SSL3_ST_SW_FINISHED_A;
 750                         s->init_num=0;
 751
 752                         if (!s->method->ssl3_enc->change_cipher_state(s,
 753                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 754                                 {
 755                                 ret= -1;
 756                                 goto end;
 757                                 }
 758
 759                         break;
 760
 761                 case SSL3_ST_SW_FINISHED_A:
 762                 case SSL3_ST_SW_FINISHED_B:
 763                         ret=ssl3_send_finished(s,
 764                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 765                                 s->method->ssl3_enc->server_finished_label,
 766                                 s->method->ssl3_enc->server_finished_label_len);
 767                         if (ret <= 0) goto end;
 768                         s->state=SSL3_ST_SW_FLUSH;
 769                         if (s->hit)
 770                                 {
 771 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 772                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 773 #else
 774                                 if (s->s3->next_proto_neg_seen)
 775                                         {
 776                                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 777                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
 778                                         }
 779                                 else
 780                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 781 #endif
 782                                 }
 783                         else
 784                                 s->s3->tmp.next_state=SSL_ST_OK;
 785                         s->init_num=0;
 786                         break;
 787
 788                 case SSL_ST_OK:
 789                         /* clean a few things up */
 790                         ssl3_cleanup_key_block(s);
 791
 792                         BUF_MEM_free(s->init_buf);
 793                         s->init_buf=NULL;
 794
 795                         /* remove buffering on output */
 796                         ssl_free_wbio_buffer(s);
 797
 798                         s->init_num=0;
 799
 800                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
 801                                 {
 802                                 s->renegotiate=0;
 803                                 s->new_session=0;
 804
 805                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 806
 807                                 s->ctx->stats.sess_accept_good++;
 808                                 /* s->server=1; */
 809                                 s->handshake_func=ssl3_accept;
 810
 811                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 812                                 }
 813
 814                         ret = 1;
 815                         goto end;
 816                         /* break; */
 817
 818                 default:
 819                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 820                         ret= -1;
 821                         goto end;
 822                         /* break; */
 823                         }
 824
 825                 if (!s->s3->tmp.reuse_message && !skip)
 826                         {
 827                         if (s->debug)
 828                                 {
 829                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 830                                         goto end;
 831                                 }
 832
 833
 834                         if ((cb != NULL) && (s->state != state))
 835                                 {
 836                                 new_state=s->state;
 837                                 s->state=state;
 838                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 839                                 s->state=new_state;
 840                                 }
 841                         }
 842                 skip=0;
 843                 }
 844 end:
 845         /* BIO_flush(s->wbio); */
 846
 847         s->in_handshake--;
 848         if (cb != NULL)
 849                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 850         return(ret);
 851         }
 852
 853 int ssl3_send_hello_request(SSL *s)
 854         {
 855         unsigned char *p;
 856
 857         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 858                 {
 859                 p=(unsigned char *)s->init_buf->data;
 860                 *(p++)=SSL3_MT_HELLO_REQUEST;
 861                 *(p++)=0;
 862                 *(p++)=0;
 863                 *(p++)=0;
 864
 865                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 866                 /* number of bytes to write */
 867                 s->init_num=4;
 868                 s->init_off=0;
 869                 }
 870
 871         /* SSL3_ST_SW_HELLO_REQ_B */
 872         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 873         }
 874
 875 int ssl3_check_client_hello(SSL *s)
 876         {
 877         int ok;
 878         long n;
 879
 880         /* this function is called when we really expect a Certificate message,
 881          * so permit appropriate message length */
 882         n=s->method->ssl_get_message(s,
 883                 SSL3_ST_SR_CERT_A,
 884                 SSL3_ST_SR_CERT_B,
 885                 -1,
 886                 s->max_cert_list,
 887                 &ok);
 888         if (!ok) return((int)n);
 889         s->s3->tmp.reuse_message = 1;
 890         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 891                 {
 892                 /* We only allow the client to restart the handshake once per
 893                  * negotiation. */
 894                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
 895                         {
 896                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
 897                         return -1;
 898                         }
 899                 /* Throw away what we have done so far in the current handshake,
 900                  * which will now be aborted. (A full SSL_clear would be too much.) */
 901 #ifndef OPENSSL_NO_DH
 902                 if (s->s3->tmp.dh != NULL)
 903                         {
 904                         DH_free(s->s3->tmp.dh);
 905                         s->s3->tmp.dh = NULL;
 906                         }
 907 #endif
 908 #ifndef OPENSSL_NO_ECDH
 909                 if (s->s3->tmp.ecdh != NULL)
 910                         {
 911                         EC_KEY_free(s->s3->tmp.ecdh);
 912                         s->s3->tmp.ecdh = NULL;
 913                         }
 914 #endif
 915                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
 916                 return 2;
 917                 }
 918         return 1;
 919 }
 920
 921 int ssl3_get_client_hello(SSL *s)
 922         {
 923         int i,j,ok,al,ret= -1;
 924         unsigned int cookie_len;
 925         long n;
 926         unsigned long id;
 927         unsigned char *p,*d,*q;
 928         SSL_CIPHER *c;
 929 #ifndef OPENSSL_NO_COMP
 930         SSL_COMP *comp=NULL;
 931 #endif
 932         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 933
 934         /* We do this so that we will respond with our native type.
 935          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 936          * This down switching should be handled by a different method.
 937          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 938          * TLSv1.
 939          */
 940         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
 941                 )
 942                 {
 943                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 944                 }
 945         s->first_packet=1;
 946         n=s->method->ssl_get_message(s,
 947                 SSL3_ST_SR_CLNT_HELLO_B,
 948                 SSL3_ST_SR_CLNT_HELLO_C,
 949                 SSL3_MT_CLIENT_HELLO,
 950                 SSL3_RT_MAX_PLAIN_LENGTH,
 951                 &ok);
 952
 953         if (!ok) return((int)n);
 954         s->first_packet=0;
 955         d=p=(unsigned char *)s->init_msg;
 956
 957         /* use version from inside client hello, not from record header
 958          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 959         s->client_version=(((int)p[0])<<8)|(int)p[1];
 960         p+=2;
 961
 962         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 963             (s->version != DTLS1_VERSION && s->client_version < s->version))
 964                 {
 965                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 966                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR &&
 967                         !s->enc_write_ctx && !s->write_hash)
 968                         {
 969                         /* similar to ssl3_get_record, send alert using remote version number */
 970                         s->version = s->client_version;
 971                         }
 972                 al = SSL_AD_PROTOCOL_VERSION;
 973                 goto f_err;
 974                 }
 975
 976         /* If we require cookies and this ClientHello doesn't
 977          * contain one, just return since we do not want to
 978          * allocate any memory yet. So check cookie length...
 979          */
 980         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
 981                 {
 982                 unsigned int session_length, cookie_length;
 983
 984                 session_length = *(p + SSL3_RANDOM_SIZE);
 985                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
 986
 987                 if (cookie_length == 0)
 988                         return 1;
 989                 }
 990
 991         /* load the client random */
 992         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 993         p+=SSL3_RANDOM_SIZE;
 994
 995         /* get the session-id */
 996         j= *(p++);
 997
 998         s->hit=0;
 999         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
1000          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
1001          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
1002          * than a change to default behavior so that applications relying on this for security
1003          * won't even compile against older library versions).
1004          *
1005          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1006          * renegotiation but not a new session (s->new_session remains unset): for servers,
1007          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1008          * setting will be ignored.
1009          */
1010         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1011                 {
1012                 if (!ssl_get_new_session(s,1))
1013                         goto err;
1014                 }
1015         else
1016                 {
1017                 i=ssl_get_prev_session(s, p, j, d + n);
1018                 if (i == 1)
1019                         { /* previous session */
1020                         s->hit=1;
1021                         }
1022                 else if (i == -1)
1023                         goto err;
1024                 else /* i == 0 */
1025                         {
1026                         if (!ssl_get_new_session(s,1))
1027                                 goto err;
1028                         }
1029                 }
1030
1031         p+=j;
1032
1033         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1034                 {
1035                 /* cookie stuff */
1036                 cookie_len = *(p++);
1037
1038                 /*
1039                  * The ClientHello may contain a cookie even if the
1040                  * HelloVerify message has not been sent--make sure that it
1041                  * does not cause an overflow.
1042                  */
1043                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1044                         {
1045                         /* too much data */
1046                         al = SSL_AD_DECODE_ERROR;
1047                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1048                         goto f_err;
1049                         }
1050
1051                 /* verify the cookie if appropriate option is set. */
1052                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1053                         cookie_len > 0)
1054                         {
1055                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1056
1057                         if ( s->ctx->app_verify_cookie_cb != NULL)
1058                                 {
1059                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1060                                         cookie_len) == 0)
1061                                         {
1062                                         al=SSL_AD_HANDSHAKE_FAILURE;
1063                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1064                                                 SSL_R_COOKIE_MISMATCH);
1065                                         goto f_err;
1066                                         }
1067                                 /* else cookie verification succeeded */
1068                                 }
1069                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
1070                                                   s->d1->cookie_len) != 0) /* default verification */
1071                                 {
1072                                         al=SSL_AD_HANDSHAKE_FAILURE;
1073                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1074                                                 SSL_R_COOKIE_MISMATCH);
1075                                         goto f_err;
1076                                 }
1077
1078                         ret = 2;
1079                         }
1080
1081                 p += cookie_len;
1082                 }
1083
1084         n2s(p,i);
1085         if ((i == 0) && (j != 0))
1086                 {
1087                 /* we need a cipher if we are not resuming a session */
1088                 al=SSL_AD_ILLEGAL_PARAMETER;
1089                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1090                 goto f_err;
1091                 }
1092         if ((p+i) >= (d+n))
1093                 {
1094                 /* not enough data */
1095                 al=SSL_AD_DECODE_ERROR;
1096                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1097                 goto f_err;
1098                 }
1099         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1100                 == NULL))
1101                 {
1102                 goto err;
1103                 }
1104         p+=i;
1105
1106         /* If it is a hit, check that the cipher is in the list */
1107         if ((s->hit) && (i > 0))
1108                 {
1109                 j=0;
1110                 id=s->session->cipher->id;
1111
1112 #ifdef CIPHER_DEBUG
1113                 printf("client sent %d ciphers\n",sk_num(ciphers));
1114 #endif
1115                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1116                         {
1117                         c=sk_SSL_CIPHER_value(ciphers,i);
1118 #ifdef CIPHER_DEBUG
1119                         printf("client [%2d of %2d]:%s\n",
1120                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1121 #endif
1122                         if (c->id == id)
1123                                 {
1124                                 j=1;
1125                                 break;
1126                                 }
1127                         }
1128 /* Disabled because it can be used in a ciphersuite downgrade
1129  * attack: CVE-2010-4180.
1130  */
1131 #if 0
1132                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1133                         {
1134                         /* Special case as client bug workaround: the previously used cipher may
1135                          * not be in the current list, the client instead might be trying to
1136                          * continue using a cipher that before wasn't chosen due to server
1137                          * preferences.  We'll have to reject the connection if the cipher is not
1138                          * enabled, though. */
1139                         c = sk_SSL_CIPHER_value(ciphers, 0);
1140                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1141                                 {
1142                                 s->session->cipher = c;
1143                                 j = 1;
1144                                 }
1145                         }
1146 #endif
1147                 if (j == 0)
1148                         {
1149                         /* we need to have the cipher in the cipher
1150                          * list if we are asked to reuse it */
1151                         al=SSL_AD_ILLEGAL_PARAMETER;
1152                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1153                         goto f_err;
1154                         }
1155                 }
1156
1157         /* compression */
1158         i= *(p++);
1159         if ((p+i) > (d+n))
1160                 {
1161                 /* not enough data */
1162                 al=SSL_AD_DECODE_ERROR;
1163                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1164                 goto f_err;
1165                 }
1166         q=p;
1167         for (j=0; j<i; j++)
1168                 {
1169                 if (p[j] == 0) break;
1170                 }
1171
1172         p+=i;
1173         if (j >= i)
1174                 {
1175                 /* no compress */
1176                 al=SSL_AD_DECODE_ERROR;
1177                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1178                 goto f_err;
1179                 }
1180
1181 #ifndef OPENSSL_NO_TLSEXT
1182         /* TLS extensions*/
1183         if (s->version >= SSL3_VERSION)
1184                 {
1185                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1186                         {
1187                         /* 'al' set by ssl_parse_clienthello_tlsext */
1188                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1189                         goto f_err;
1190                         }
1191                 }
1192                 if (ssl_check_clienthello_tlsext_early(s) <= 0) {
1193                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1194                         goto err;
1195                 }
1196
1197         /* Check if we want to use external pre-shared secret for this
1198          * handshake for not reused session only. We need to generate
1199          * server_random before calling tls_session_secret_cb in order to allow
1200          * SessionTicket processing to use it in key derivation. */
1201         {
1202                 unsigned char *pos;
1203                 pos=s->s3->server_random;
1204                 if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0)
1205                         {
1206                         al=SSL_AD_INTERNAL_ERROR;
1207                         goto f_err;
1208                         }
1209         }
1210
1211         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1212                 {
1213                 SSL_CIPHER *pref_cipher=NULL;
1214
1215                 s->session->master_key_length=sizeof(s->session->master_key);
1216                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1217                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1218                         {
1219                         s->hit=1;
1220                         s->session->ciphers=ciphers;
1221                         s->session->verify_result=X509_V_OK;
1222
1223                         ciphers=NULL;
1224
1225                         /* check if some cipher was preferred by call back */
1226                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1227                         if (pref_cipher == NULL)
1228                                 {
1229                                 al=SSL_AD_HANDSHAKE_FAILURE;
1230                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1231                                 goto f_err;
1232                                 }
1233
1234                         s->session->cipher=pref_cipher;
1235
1236                         if (s->cipher_list)
1237                                 sk_SSL_CIPHER_free(s->cipher_list);
1238
1239                         if (s->cipher_list_by_id)
1240                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1241
1242                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1243                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1244                         }
1245                 }
1246 #endif
1247
1248         /* Worst case, we will use the NULL compression, but if we have other
1249          * options, we will now look for them.  We have i-1 compression
1250          * algorithms from the client, starting at q. */
1251         s->s3->tmp.new_compression=NULL;
1252 #ifndef OPENSSL_NO_COMP
1253         /* This only happens if we have a cache hit */
1254         if (s->session->compress_meth != 0)
1255                 {
1256                 int m, comp_id = s->session->compress_meth;
1257                 /* Perform sanity checks on resumed compression algorithm */
1258                 /* Can't disable compression */
1259                 if (s->options & SSL_OP_NO_COMPRESSION)
1260                         {
1261                         al=SSL_AD_INTERNAL_ERROR;
1262                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1263                         goto f_err;
1264                         }
1265                 /* Look for resumed compression method */
1266                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1267                         {
1268                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1269                         if (comp_id == comp->id)
1270                                 {
1271                                 s->s3->tmp.new_compression=comp;
1272                                 break;
1273                                 }
1274                         }
1275                 if (s->s3->tmp.new_compression == NULL)
1276                         {
1277                         al=SSL_AD_INTERNAL_ERROR;
1278                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1279                         goto f_err;
1280                         }
1281                 /* Look for resumed method in compression list */
1282                 for (m = 0; m < i; m++)
1283                         {
1284                         if (q[m] == comp_id)
1285                                 break;
1286                         }
1287                 if (m >= i)
1288                         {
1289                         al=SSL_AD_ILLEGAL_PARAMETER;
1290                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1291                         goto f_err;
1292                         }
1293                 }
1294         else if (s->hit)
1295                 comp = NULL;
1296         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1297                 { /* See if we have a match */
1298                 int m,nn,o,v,done=0;
1299
1300                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1301                 for (m=0; m<nn; m++)
1302                         {
1303                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1304                         v=comp->id;
1305                         for (o=0; o<i; o++)
1306                                 {
1307                                 if (v == q[o])
1308                                         {
1309                                         done=1;
1310                                         break;
1311                                         }
1312                                 }
1313                         if (done) break;
1314                         }
1315                 if (done)
1316                         s->s3->tmp.new_compression=comp;
1317                 else
1318                         comp=NULL;
1319                 }
1320 #else
1321         /* If compression is disabled we'd better not try to resume a session
1322          * using compression.
1323          */
1324         if (s->session->compress_meth != 0)
1325                 {
1326                 al=SSL_AD_INTERNAL_ERROR;
1327                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1328                 goto f_err;
1329                 }
1330 #endif
1331
1332         /* Given s->session->ciphers and SSL_get_ciphers, we must
1333          * pick a cipher */
1334
1335         if (!s->hit)
1336                 {
1337 #ifdef OPENSSL_NO_COMP
1338                 s->session->compress_meth=0;
1339 #else
1340                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1341 #endif
1342                 if (s->session->ciphers != NULL)
1343                         sk_SSL_CIPHER_free(s->session->ciphers);
1344                 s->session->ciphers=ciphers;
1345                 if (ciphers == NULL)
1346                         {
1347                         al=SSL_AD_ILLEGAL_PARAMETER;
1348                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1349                         goto f_err;
1350                         }
1351                 ciphers=NULL;
1352                 c=ssl3_choose_cipher(s,s->session->ciphers,
1353                                      SSL_get_ciphers(s));
1354
1355                 if (c == NULL)
1356                         {
1357                         al=SSL_AD_HANDSHAKE_FAILURE;
1358                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1359                         goto f_err;
1360                         }
1361                 s->s3->tmp.new_cipher=c;
1362                 }
1363         else
1364                 {
1365                 /* Session-id reuse */
1366 #ifdef REUSE_CIPHER_BUG
1367                 STACK_OF(SSL_CIPHER) *sk;
1368                 SSL_CIPHER *nc=NULL;
1369                 SSL_CIPHER *ec=NULL;
1370
1371                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1372                         {
1373                         sk=s->session->ciphers;
1374                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1375                                 {
1376                                 c=sk_SSL_CIPHER_value(sk,i);
1377                                 if (c->algorithm_enc & SSL_eNULL)
1378                                         nc=c;
1379                                 if (SSL_C_IS_EXPORT(c))
1380                                         ec=c;
1381                                 }
1382                         if (nc != NULL)
1383                                 s->s3->tmp.new_cipher=nc;
1384                         else if (ec != NULL)
1385                                 s->s3->tmp.new_cipher=ec;
1386                         else
1387                                 s->s3->tmp.new_cipher=s->session->cipher;
1388                         }
1389                 else
1390 #endif
1391                 s->s3->tmp.new_cipher=s->session->cipher;
1392                 }
1393
1394         if (TLS1_get_version(s) < TLS1_2_VERSION || !(s->verify_mode & SSL_VERIFY_PEER))
1395                 {
1396                 if (!ssl3_digest_cached_records(s))
1397                         {
1398                         al = SSL_AD_INTERNAL_ERROR;
1399                         goto f_err;
1400                         }
1401                 }
1402
1403         /* we now have the following setup.
1404          * client_random
1405          * cipher_list          - our prefered list of ciphers
1406          * ciphers              - the clients prefered list of ciphers
1407          * compression          - basically ignored right now
1408          * ssl version is set   - sslv3
1409          * s->session           - The ssl session has been setup.
1410          * s->hit               - session reuse flag
1411          * s->tmp.new_cipher    - the new cipher to use.
1412          */
1413
1414         /* Handles TLS extensions that we couldn't check earlier */
1415         if (s->version >= SSL3_VERSION)
1416                 {
1417                 if (ssl_check_clienthello_tlsext_late(s) <= 0)
1418                         {
1419                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1420                         goto err;
1421                         }
1422                 }
1423
1424         if (ret < 0) ret=1;
1425         if (0)
1426                 {
1427 f_err:
1428                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1429                 }
1430 err:
1431         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1432         return(ret);
1433         }
1434
1435 int ssl3_send_server_hello(SSL *s)
1436         {
1437         unsigned char *buf;
1438         unsigned char *p,*d;
1439         int i,sl;
1440         unsigned long l;
1441
1442         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1443                 {
1444                 buf=(unsigned char *)s->init_buf->data;
1445 #ifdef OPENSSL_NO_TLSEXT
1446                 p=s->s3->server_random;
1447                 if (ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE) <= 0)
1448                         return -1;
1449 #endif
1450                 /* Do the message type and length last */
1451                 d=p= &(buf[4]);
1452
1453                 *(p++)=s->version>>8;
1454                 *(p++)=s->version&0xff;
1455
1456                 /* Random stuff */
1457                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1458                 p+=SSL3_RANDOM_SIZE;
1459
1460                 /* There are several cases for the session ID to send
1461                  * back in the server hello:
1462                  * - For session reuse from the session cache,
1463                  *   we send back the old session ID.
1464                  * - If stateless session reuse (using a session ticket)
1465                  *   is successful, we send back the client's "session ID"
1466                  *   (which doesn't actually identify the session).
1467                  * - If it is a new session, we send back the new
1468                  *   session ID.
1469                  * - However, if we want the new session to be single-use,
1470                  *   we send back a 0-length session ID.
1471                  * s->hit is non-zero in either case of session reuse,
1472                  * so the following won't overwrite an ID that we're supposed
1473                  * to send back.
1474                  */
1475                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1476                         && !s->hit)
1477                         s->session->session_id_length=0;
1478
1479                 sl=s->session->session_id_length;
1480                 if (sl > (int)sizeof(s->session->session_id))
1481                         {
1482                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1483                         return -1;
1484                         }
1485                 *(p++)=sl;
1486                 memcpy(p,s->session->session_id,sl);
1487                 p+=sl;
1488
1489                 /* put the cipher */
1490                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1491                 p+=i;
1492
1493                 /* put the compression method */
1494 #ifdef OPENSSL_NO_COMP
1495                         *(p++)=0;
1496 #else
1497                 if (s->s3->tmp.new_compression == NULL)
1498                         *(p++)=0;
1499                 else
1500                         *(p++)=s->s3->tmp.new_compression->id;
1501 #endif
1502 #ifndef OPENSSL_NO_TLSEXT
1503                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1504                         {
1505                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1506                         return -1;
1507                         }
1508                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1509                         {
1510                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1511                         return -1;
1512                         }
1513 #endif
1514                 /* do the header */
1515                 l=(p-d);
1516                 d=buf;
1517                 *(d++)=SSL3_MT_SERVER_HELLO;
1518                 l2n3(l,d);
1519
1520                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1521                 /* number of bytes to write */
1522                 s->init_num=p-buf;
1523                 s->init_off=0;
1524                 }
1525
1526         /* SSL3_ST_SW_SRVR_HELLO_B */
1527         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1528         }
1529
1530 int ssl3_send_server_done(SSL *s)
1531         {
1532         unsigned char *p;
1533
1534         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1535                 {
1536                 p=(unsigned char *)s->init_buf->data;
1537
1538                 /* do the header */
1539                 *(p++)=SSL3_MT_SERVER_DONE;
1540                 *(p++)=0;
1541                 *(p++)=0;
1542                 *(p++)=0;
1543
1544                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1545                 /* number of bytes to write */
1546                 s->init_num=4;
1547                 s->init_off=0;
1548                 }
1549
1550         /* SSL3_ST_SW_SRVR_DONE_B */
1551         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1552         }
1553
1554 int ssl3_send_server_key_exchange(SSL *s)
1555         {
1556 #ifndef OPENSSL_NO_RSA
1557         unsigned char *q;
1558         int j,num;
1559         RSA *rsa;
1560         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1561         unsigned int u;
1562 #endif
1563 #ifndef OPENSSL_NO_DH
1564         DH *dh=NULL,*dhp;
1565 #endif
1566 #ifndef OPENSSL_NO_ECDH
1567         EC_KEY *ecdh=NULL, *ecdhp;
1568         unsigned char *encodedPoint = NULL;
1569         int encodedlen = 0;
1570         int curve_id = 0;
1571         BN_CTX *bn_ctx = NULL;
1572 #endif
1573         EVP_PKEY *pkey;
1574         const EVP_MD *md = NULL;
1575         unsigned char *p,*d;
1576         int al,i;
1577         unsigned long type;
1578         int n;
1579         CERT *cert;
1580         BIGNUM *r[4];
1581         int nr[4],kn;
1582         BUF_MEM *buf;
1583         EVP_MD_CTX md_ctx;
1584
1585         EVP_MD_CTX_init(&md_ctx);
1586         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1587                 {
1588                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1589                 cert=s->cert;
1590
1591                 buf=s->init_buf;
1592
1593                 r[0]=r[1]=r[2]=r[3]=NULL;
1594                 n=0;
1595 #ifndef OPENSSL_NO_RSA
1596                 if (type & SSL_kRSA)
1597                         {
1598                         rsa=cert->rsa_tmp;
1599                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1600                                 {
1601                                 rsa=s->cert->rsa_tmp_cb(s,
1602                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1603                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1604                                 if(rsa == NULL)
1605                                 {
1606                                         al=SSL_AD_HANDSHAKE_FAILURE;
1607                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1608                                         goto f_err;
1609                                 }
1610                                 RSA_up_ref(rsa);
1611                                 cert->rsa_tmp=rsa;
1612                                 }
1613                         if (rsa == NULL)
1614                                 {
1615                                 al=SSL_AD_HANDSHAKE_FAILURE;
1616                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1617                                 goto f_err;
1618                                 }
1619                         r[0]=rsa->n;
1620                         r[1]=rsa->e;
1621                         s->s3->tmp.use_rsa_tmp=1;
1622                         }
1623                 else
1624 #endif
1625 #ifndef OPENSSL_NO_DH
1626                         if (type & SSL_kEDH)
1627                         {
1628                         dhp=cert->dh_tmp;
1629                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1630                                 dhp=s->cert->dh_tmp_cb(s,
1631                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1632                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1633                         if (dhp == NULL)
1634                                 {
1635                                 al=SSL_AD_HANDSHAKE_FAILURE;
1636                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1637                                 goto f_err;
1638                                 }
1639
1640                         if (s->s3->tmp.dh != NULL)
1641                                 {
1642                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1643                                 goto err;
1644                                 }
1645
1646                         if ((dh=DHparams_dup(dhp)) == NULL)
1647                                 {
1648                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1649                                 goto err;
1650                                 }
1651
1652                         s->s3->tmp.dh=dh;
1653                         if ((dhp->pub_key == NULL ||
1654                              dhp->priv_key == NULL ||
1655                              (s->options & SSL_OP_SINGLE_DH_USE)))
1656                                 {
1657                                 if(!DH_generate_key(dh))
1658                                     {
1659                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1660                                            ERR_R_DH_LIB);
1661                                     goto err;
1662                                     }
1663                                 }
1664                         else
1665                                 {
1666                                 dh->pub_key=BN_dup(dhp->pub_key);
1667                                 dh->priv_key=BN_dup(dhp->priv_key);
1668                                 if ((dh->pub_key == NULL) ||
1669                                         (dh->priv_key == NULL))
1670                                         {
1671                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1672                                         goto err;
1673                                         }
1674                                 }
1675                         r[0]=dh->p;
1676                         r[1]=dh->g;
1677                         r[2]=dh->pub_key;
1678                         }
1679                 else
1680 #endif
1681 #ifndef OPENSSL_NO_ECDH
1682                         if (type & SSL_kEECDH)
1683                         {
1684                         const EC_GROUP *group;
1685
1686                         ecdhp=cert->ecdh_tmp;
1687                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1688                                 {
1689                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1690                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1691                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1692                                 }
1693                         if (ecdhp == NULL)
1694                                 {
1695                                 al=SSL_AD_HANDSHAKE_FAILURE;
1696                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1697                                 goto f_err;
1698                                 }
1699
1700                         if (s->s3->tmp.ecdh != NULL)
1701                                 {
1702                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1703                                 goto err;
1704                                 }
1705
1706                         /* Duplicate the ECDH structure. */
1707                         if (ecdhp == NULL)
1708                                 {
1709                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1710                                 goto err;
1711                                 }
1712                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1713                                 {
1714                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1715                                 goto err;
1716                                 }
1717
1718                         s->s3->tmp.ecdh=ecdh;
1719                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1720                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1721                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1722                                 {
1723                                 if(!EC_KEY_generate_key(ecdh))
1724                                     {
1725                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1726                                     goto err;
1727                                     }
1728                                 }
1729
1730                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1731                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1732                             (EC_KEY_get0_private_key(ecdh) == NULL))
1733                                 {
1734                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1735                                 goto err;
1736                                 }
1737
1738                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1739                             (EC_GROUP_get_degree(group) > 163))
1740                                 {
1741                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1742                                 goto err;
1743                                 }
1744
1745                         /* XXX: For now, we only support ephemeral ECDH
1746                          * keys over named (not generic) curves. For
1747                          * supported named curves, curve_id is non-zero.
1748                          */
1749                         if ((curve_id =
1750                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1751                             == 0)
1752                                 {
1753                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1754                                 goto err;
1755                                 }
1756
1757                         /* Encode the public key.
1758                          * First check the size of encoding and
1759                          * allocate memory accordingly.
1760                          */
1761                         encodedlen = EC_POINT_point2oct(group,
1762                             EC_KEY_get0_public_key(ecdh),
1763                             POINT_CONVERSION_UNCOMPRESSED,
1764                             NULL, 0, NULL);
1765
1766                         encodedPoint = (unsigned char *)
1767                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1768                         bn_ctx = BN_CTX_new();
1769                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1770                                 {
1771                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1772                                 goto err;
1773                                 }
1774
1775
1776                         encodedlen = EC_POINT_point2oct(group,
1777                             EC_KEY_get0_public_key(ecdh),
1778                             POINT_CONVERSION_UNCOMPRESSED,
1779                             encodedPoint, encodedlen, bn_ctx);
1780
1781                         if (encodedlen == 0)
1782                                 {
1783                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1784                                 goto err;
1785                                 }
1786
1787                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1788
1789                         /* XXX: For now, we only support named (not
1790                          * generic) curves in ECDH ephemeral key exchanges.
1791                          * In this situation, we need four additional bytes
1792                          * to encode the entire ServerECDHParams
1793                          * structure.
1794                          */
1795                         n = 4 + encodedlen;
1796
1797                         /* We'll generate the serverKeyExchange message
1798                          * explicitly so we can set these to NULLs
1799                          */
1800                         r[0]=NULL;
1801                         r[1]=NULL;
1802                         r[2]=NULL;
1803                         r[3]=NULL;
1804                         }
1805                 else
1806 #endif /* !OPENSSL_NO_ECDH */
1807 #ifndef OPENSSL_NO_PSK
1808                         if (type & SSL_kPSK)
1809                                 {
1810                                 /* reserve size for record length and PSK identity hint*/
1811                                 n+=2+strlen(s->ctx->psk_identity_hint);
1812                                 }
1813                         else
1814 #endif /* !OPENSSL_NO_PSK */
1815 #ifndef OPENSSL_NO_SRP
1816                 if (type & SSL_kSRP)
1817                         {
1818                         if ((s->srp_ctx.N == NULL) ||
1819                                 (s->srp_ctx.g == NULL) ||
1820                                 (s->srp_ctx.s == NULL) ||
1821                                 (s->srp_ctx.B == NULL))
1822                                 {
1823                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1824                                 goto err;
1825                                 }
1826                         r[0]=s->srp_ctx.N;
1827                         r[1]=s->srp_ctx.g;
1828                         r[2]=s->srp_ctx.s;
1829                         r[3]=s->srp_ctx.B;
1830                         }
1831                 else
1832 #endif
1833                         {
1834                         al=SSL_AD_HANDSHAKE_FAILURE;
1835                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1836                         goto f_err;
1837                         }
1838                 for (i=0; i < 4 && r[i] != NULL; i++)
1839                         {
1840                         nr[i]=BN_num_bytes(r[i]);
1841 #ifndef OPENSSL_NO_SRP
1842                         if ((i == 2) && (type & SSL_kSRP))
1843                                 n+=1+nr[i];
1844                         else
1845 #endif
1846                         n+=2+nr[i];
1847                         }
1848
1849                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1850                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1851                         {
1852                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1853                                 == NULL)
1854                                 {
1855                                 al=SSL_AD_DECODE_ERROR;
1856                                 goto f_err;
1857                                 }
1858                         kn=EVP_PKEY_size(pkey);
1859                         }
1860                 else
1861                         {
1862                         pkey=NULL;
1863                         kn=0;
1864                         }
1865
1866                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1867                         {
1868                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1869                         goto err;
1870                         }
1871                 d=(unsigned char *)s->init_buf->data;
1872                 p= &(d[4]);
1873
1874                 for (i=0; i < 4 && r[i] != NULL; i++)
1875                         {
1876 #ifndef OPENSSL_NO_SRP
1877                         if ((i == 2) && (type & SSL_kSRP))
1878                                 {
1879                                 *p = nr[i];
1880                                 p++;
1881                                 }
1882                         else
1883 #endif
1884                         s2n(nr[i],p);
1885                         BN_bn2bin(r[i],p);
1886                         p+=nr[i];
1887                         }
1888
1889 #ifndef OPENSSL_NO_ECDH
1890                 if (type & SSL_kEECDH)
1891                         {
1892                         /* XXX: For now, we only support named (not generic) curves.
1893                          * In this situation, the serverKeyExchange message has:
1894                          * [1 byte CurveType], [2 byte CurveName]
1895                          * [1 byte length of encoded point], followed by
1896                          * the actual encoded point itself
1897                          */
1898                         *p = NAMED_CURVE_TYPE;
1899                         p += 1;
1900                         *p = 0;
1901                         p += 1;
1902                         *p = curve_id;
1903                         p += 1;
1904                         *p = encodedlen;
1905                         p += 1;
1906                         memcpy((unsigned char*)p,
1907                             (unsigned char *)encodedPoint,
1908                             encodedlen);
1909                         OPENSSL_free(encodedPoint);
1910                         encodedPoint = NULL;
1911                         p += encodedlen;
1912                         }
1913 #endif
1914
1915 #ifndef OPENSSL_NO_PSK
1916                 if (type & SSL_kPSK)
1917                         {
1918                         /* copy PSK identity hint */
1919                         s2n(strlen(s->ctx->psk_identity_hint), p);
1920                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1921                         p+=strlen(s->ctx->psk_identity_hint);
1922                         }
1923 #endif
1924
1925                 /* not anonymous */
1926                 if (pkey != NULL)
1927                         {
1928                         /* n is the length of the params, they start at &(d[4])
1929                          * and p points to the space at the end. */
1930 #ifndef OPENSSL_NO_RSA
1931                         if (pkey->type == EVP_PKEY_RSA
1932                                         && TLS1_get_version(s) < TLS1_2_VERSION)
1933                                 {
1934                                 q=md_buf;
1935                                 j=0;
1936                                 for (num=2; num > 0; num--)
1937                                         {
1938                                         EVP_MD_CTX_set_flags(&md_ctx,
1939                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1940                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1941                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1942                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1943                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1944                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1945                                         EVP_DigestFinal_ex(&md_ctx,q,
1946                                                 (unsigned int *)&i);
1947                                         q+=i;
1948                                         j+=i;
1949                                         }
1950                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1951                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1952                                         {
1953                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1954                                         goto err;
1955                                         }
1956                                 s2n(u,p);
1957                                 n+=u+2;
1958                                 }
1959                         else
1960 #endif
1961                         if (md)
1962                                 {
1963                                 /* For TLS1.2 and later send signature
1964                                  * algorithm */
1965                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1966                                         {
1967                                         if (!tls12_get_sigandhash(p, pkey, md))
1968                                                 {
1969                                                 /* Should never happen */
1970                                                 al=SSL_AD_INTERNAL_ERROR;
1971                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1972                                                 goto f_err;
1973                                                 }
1974                                         p+=2;
1975                                         }
1976 #ifdef SSL_DEBUG
1977                                 fprintf(stderr, "Using hash %s\n",
1978                                                         EVP_MD_name(md));
1979 #endif
1980                                 EVP_SignInit_ex(&md_ctx, md, NULL);
1981                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1982                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1983                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1984                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1985                                         (unsigned int *)&i,pkey))
1986                                         {
1987                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
1988                                         goto err;
1989                                         }
1990                                 s2n(i,p);
1991                                 n+=i+2;
1992                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1993                                         n+= 2;
1994                                 }
1995                         else
1996                                 {
1997                                 /* Is this error check actually needed? */
1998                                 al=SSL_AD_HANDSHAKE_FAILURE;
1999                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2000                                 goto f_err;
2001                                 }
2002                         }
2003
2004                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
2005                 l2n3(n,d);
2006
2007                 /* we should now have things packed up, so lets send
2008                  * it off */
2009                 s->init_num=n+4;
2010                 s->init_off=0;
2011                 }
2012
2013         s->state = SSL3_ST_SW_KEY_EXCH_B;
2014         EVP_MD_CTX_cleanup(&md_ctx);
2015         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2016 f_err:
2017         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2018 err:
2019 #ifndef OPENSSL_NO_ECDH
2020         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2021         BN_CTX_free(bn_ctx);
2022 #endif
2023         EVP_MD_CTX_cleanup(&md_ctx);
2024         return(-1);
2025         }
2026
2027 int ssl3_send_certificate_request(SSL *s)
2028         {
2029         unsigned char *p,*d;
2030         int i,j,nl,off,n;
2031         STACK_OF(X509_NAME) *sk=NULL;
2032         X509_NAME *name;
2033         BUF_MEM *buf;
2034
2035         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2036                 {
2037                 buf=s->init_buf;
2038
2039                 d=p=(unsigned char *)&(buf->data[4]);
2040
2041                 /* get the list of acceptable cert types */
2042                 p++;
2043                 n=ssl3_get_req_cert_type(s,p);
2044                 d[0]=n;
2045                 p+=n;
2046                 n++;
2047
2048                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2049                         {
2050                         nl = tls12_get_req_sig_algs(s, p + 2);
2051                         s2n(nl, p);
2052                         p += nl + 2;
2053                         n += nl + 2;
2054                         }
2055
2056                 off=n;
2057                 p+=2;
2058                 n+=2;
2059
2060                 sk=SSL_get_client_CA_list(s);
2061                 nl=0;
2062                 if (sk != NULL)
2063                         {
2064                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2065                                 {
2066                                 name=sk_X509_NAME_value(sk,i);
2067                                 j=i2d_X509_NAME(name,NULL);
2068                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2069                                         {
2070                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2071                                         goto err;
2072                                         }
2073                                 p=(unsigned char *)&(buf->data[4+n]);
2074                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2075                                         {
2076                                         s2n(j,p);
2077                                         i2d_X509_NAME(name,&p);
2078                                         n+=2+j;
2079                                         nl+=2+j;
2080                                         }
2081                                 else
2082                                         {
2083                                         d=p;
2084                                         i2d_X509_NAME(name,&p);
2085                                         j-=2; s2n(j,d); j+=2;
2086                                         n+=j;
2087                                         nl+=j;
2088                                         }
2089                                 }
2090                         }
2091                 /* else no CA names */
2092                 p=(unsigned char *)&(buf->data[4+off]);
2093                 s2n(nl,p);
2094
2095                 d=(unsigned char *)buf->data;
2096                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
2097                 l2n3(n,d);
2098
2099                 /* we should now have things packed up, so lets send
2100                  * it off */
2101
2102                 s->init_num=n+4;
2103                 s->init_off=0;
2104 #ifdef NETSCAPE_HANG_BUG
2105                 if (!BUF_MEM_grow_clean(buf, s->init_num + 4))
2106                         {
2107                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2108                         goto err;
2109                         }
2110                 p=(unsigned char *)s->init_buf->data + s->init_num;
2111
2112                 /* do the header */
2113                 *(p++)=SSL3_MT_SERVER_DONE;
2114                 *(p++)=0;
2115                 *(p++)=0;
2116                 *(p++)=0;
2117                 s->init_num += 4;
2118 #endif
2119
2120                 s->state = SSL3_ST_SW_CERT_REQ_B;
2121                 }
2122
2123         /* SSL3_ST_SW_CERT_REQ_B */
2124         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2125 err:
2126         return(-1);
2127         }
2128
2129 int ssl3_get_client_key_exchange(SSL *s)
2130         {
2131         int i,al,ok;
2132         long n;
2133         unsigned long alg_k;
2134         unsigned char *p;
2135 #ifndef OPENSSL_NO_RSA
2136         RSA *rsa=NULL;
2137         EVP_PKEY *pkey=NULL;
2138 #endif
2139 #ifndef OPENSSL_NO_DH
2140         BIGNUM *pub=NULL;
2141         DH *dh_srvr;
2142 #endif
2143 #ifndef OPENSSL_NO_KRB5
2144         KSSL_ERR kssl_err;
2145 #endif /* OPENSSL_NO_KRB5 */
2146
2147 #ifndef OPENSSL_NO_ECDH
2148         EC_KEY *srvr_ecdh = NULL;
2149         EVP_PKEY *clnt_pub_pkey = NULL;
2150         EC_POINT *clnt_ecpoint = NULL;
2151         BN_CTX *bn_ctx = NULL;
2152 #endif
2153
2154         n=s->method->ssl_get_message(s,
2155                 SSL3_ST_SR_KEY_EXCH_A,
2156                 SSL3_ST_SR_KEY_EXCH_B,
2157                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2158                 2048, /* ??? */
2159                 &ok);
2160
2161         if (!ok) return((int)n);
2162         p=(unsigned char *)s->init_msg;
2163
2164         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2165
2166 #ifndef OPENSSL_NO_RSA
2167         if (alg_k & SSL_kRSA)
2168                 {
2169                 /* FIX THIS UP EAY EAY EAY EAY */
2170                 if (s->s3->tmp.use_rsa_tmp)
2171                         {
2172                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2173                                 rsa=s->cert->rsa_tmp;
2174                         /* Don't do a callback because rsa_tmp should
2175                          * be sent already */
2176                         if (rsa == NULL)
2177                                 {
2178                                 al=SSL_AD_HANDSHAKE_FAILURE;
2179                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2180                                 goto f_err;
2181
2182                                 }
2183                         }
2184                 else
2185                         {
2186                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2187                         if (    (pkey == NULL) ||
2188                                 (pkey->type != EVP_PKEY_RSA) ||
2189                                 (pkey->pkey.rsa == NULL))
2190                                 {
2191                                 al=SSL_AD_HANDSHAKE_FAILURE;
2192                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2193                                 goto f_err;
2194                                 }
2195                         rsa=pkey->pkey.rsa;
2196                         }
2197
2198                 /* TLS and [incidentally] DTLS{0xFEFF} */
2199                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2200                         {
2201                         n2s(p,i);
2202                         if (n != i+2)
2203                                 {
2204                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2205                                         {
2206                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2207                                         goto err;
2208                                         }
2209                                 else
2210                                         p-=2;
2211                                 }
2212                         else
2213                                 n=i;
2214                         }
2215
2216                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2217
2218                 al = -1;
2219
2220                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2221                         {
2222                         al=SSL_AD_DECODE_ERROR;
2223                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2224                         }
2225
2226                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2227                         {
2228                         /* The premaster secret must contain the same version number as the
2229                          * ClientHello to detect version rollback attacks (strangely, the
2230                          * protocol does not offer such protection for DH ciphersuites).
2231                          * However, buggy clients exist that send the negotiated protocol
2232                          * version instead if the server does not support the requested
2233                          * protocol version.
2234                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2235                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2236                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2237                                 {
2238                                 al=SSL_AD_DECODE_ERROR;
2239                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2240
2241                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2242                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2243                                  * number check as a "bad version oracle" -- an alert would
2244                                  * reveal that the plaintext corresponding to some ciphertext
2245                                  * made up by the adversary is properly formatted except
2246                                  * that the version number is wrong.  To avoid such attacks,
2247                                  * we should treat this just like any other decryption error. */
2248                                 }
2249                         }
2250
2251                 if (al != -1)
2252                         {
2253                         /* Some decryption failure -- use random value instead as countermeasure
2254                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2255                          * (see RFC 2246, section 7.4.7.1). */
2256                         ERR_clear_error();
2257                         i = SSL_MAX_MASTER_KEY_LENGTH;
2258                         p[0] = s->client_version >> 8;
2259                         p[1] = s->client_version & 0xff;
2260                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2261                                 goto err;
2262                         }
2263
2264                 s->session->master_key_length=
2265                         s->method->ssl3_enc->generate_master_secret(s,
2266                                 s->session->master_key,
2267                                 p,i);
2268                 OPENSSL_cleanse(p,i);
2269                 }
2270         else
2271 #endif
2272 #ifndef OPENSSL_NO_DH
2273                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2274                 {
2275                 n2s(p,i);
2276                 if (n != i+2)
2277                         {
2278                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2279                                 {
2280                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2281                                 goto err;
2282                                 }
2283                         else
2284                                 {
2285                                 p-=2;
2286                                 i=(int)n;
2287                                 }
2288                         }
2289
2290                 if (n == 0L) /* the parameters are in the cert */
2291                         {
2292                         al=SSL_AD_HANDSHAKE_FAILURE;
2293                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
2294                         goto f_err;
2295                         }
2296                 else
2297                         {
2298                         if (s->s3->tmp.dh == NULL)
2299                                 {
2300                                 al=SSL_AD_HANDSHAKE_FAILURE;
2301                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2302                                 goto f_err;
2303                                 }
2304                         else
2305                                 dh_srvr=s->s3->tmp.dh;
2306                         }
2307
2308                 pub=BN_bin2bn(p,i,NULL);
2309                 if (pub == NULL)
2310                         {
2311                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2312                         goto err;
2313                         }
2314
2315                 i=DH_compute_key(p,pub,dh_srvr);
2316
2317                 if (i <= 0)
2318                         {
2319                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2320                         BN_clear_free(pub);
2321                         goto err;
2322                         }
2323
2324                 DH_free(s->s3->tmp.dh);
2325                 s->s3->tmp.dh=NULL;
2326
2327                 BN_clear_free(pub);
2328                 pub=NULL;
2329                 s->session->master_key_length=
2330                         s->method->ssl3_enc->generate_master_secret(s,
2331                                 s->session->master_key,p,i);
2332                 OPENSSL_cleanse(p,i);
2333                 }
2334         else
2335 #endif
2336 #ifndef OPENSSL_NO_KRB5
2337         if (alg_k & SSL_kKRB5)
2338                 {
2339                 krb5_error_code         krb5rc;
2340                 krb5_data               enc_ticket;
2341                 krb5_data               authenticator;
2342                 krb5_data               enc_pms;
2343                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2344                 EVP_CIPHER_CTX          ciph_ctx;
2345                 const EVP_CIPHER        *enc = NULL;
2346                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2347                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2348                                                + EVP_MAX_BLOCK_LENGTH];
2349                 int                  padl, outl;
2350                 krb5_timestamp          authtime = 0;
2351                 krb5_ticket_times       ttimes;
2352
2353                 EVP_CIPHER_CTX_init(&ciph_ctx);
2354
2355                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2356
2357                 n2s(p,i);
2358                 enc_ticket.length = i;
2359
2360                 if (n < (long)(enc_ticket.length + 6))
2361                         {
2362                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2363                                 SSL_R_DATA_LENGTH_TOO_LONG);
2364                         goto err;
2365                         }
2366
2367                 enc_ticket.data = (char *)p;
2368                 p+=enc_ticket.length;
2369
2370                 n2s(p,i);
2371                 authenticator.length = i;
2372
2373                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2374                         {
2375                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2376                                 SSL_R_DATA_LENGTH_TOO_LONG);
2377                         goto err;
2378                         }
2379
2380                 authenticator.data = (char *)p;
2381                 p+=authenticator.length;
2382
2383                 n2s(p,i);
2384                 enc_pms.length = i;
2385                 enc_pms.data = (char *)p;
2386                 p+=enc_pms.length;
2387
2388                 /* Note that the length is checked again below,
2389                 ** after decryption
2390                 */
2391                 if(enc_pms.length > sizeof pms)
2392                         {
2393                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2394                                SSL_R_DATA_LENGTH_TOO_LONG);
2395                         goto err;
2396                         }
2397
2398                 if (n != (long)(enc_ticket.length + authenticator.length +
2399                                                 enc_pms.length + 6))
2400                         {
2401                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2402                                 SSL_R_DATA_LENGTH_TOO_LONG);
2403                         goto err;
2404                         }
2405
2406                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2407                                         &kssl_err)) != 0)
2408                         {
2409 #ifdef KSSL_DEBUG
2410                         printf("kssl_sget_tkt rtn %d [%d]\n",
2411                                 krb5rc, kssl_err.reason);
2412                         if (kssl_err.text)
2413                                 printf("kssl_err text= %s\n", kssl_err.text);
2414 #endif  /* KSSL_DEBUG */
2415                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2416                                 kssl_err.reason);
2417                         goto err;
2418                         }
2419
2420                 /*  Note: no authenticator is not considered an error,
2421                 **  but will return authtime == 0.
2422                 */
2423                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2424                                         &authtime, &kssl_err)) != 0)
2425                         {
2426 #ifdef KSSL_DEBUG
2427                         printf("kssl_check_authent rtn %d [%d]\n",
2428                                 krb5rc, kssl_err.reason);
2429                         if (kssl_err.text)
2430                                 printf("kssl_err text= %s\n", kssl_err.text);
2431 #endif  /* KSSL_DEBUG */
2432                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2433                                 kssl_err.reason);
2434                         goto err;
2435                         }
2436
2437                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2438                         {
2439                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2440                         goto err;
2441                         }
2442
2443 #ifdef KSSL_DEBUG
2444                 kssl_ctx_show(kssl_ctx);
2445 #endif  /* KSSL_DEBUG */
2446
2447                 enc = kssl_map_enc(kssl_ctx->enctype);
2448                 if (enc == NULL)
2449                     goto err;
2450
2451                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2452
2453                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2454                         {
2455                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2456                                 SSL_R_DECRYPTION_FAILED);
2457                         goto err;
2458                         }
2459                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2460                                         (unsigned char *)enc_pms.data, enc_pms.length))
2461                         {
2462                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2463                                 SSL_R_DECRYPTION_FAILED);
2464                         goto err;
2465                         }
2466                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2467                         {
2468                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2469                                 SSL_R_DATA_LENGTH_TOO_LONG);
2470                         goto err;
2471                         }
2472                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2473                         {
2474                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2475                                 SSL_R_DECRYPTION_FAILED);
2476                         goto err;
2477                         }
2478                 outl += padl;
2479                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2480                         {
2481                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2482                                 SSL_R_DATA_LENGTH_TOO_LONG);
2483                         goto err;
2484                         }
2485                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2486                     {
2487                     /* The premaster secret must contain the same version number as the
2488                      * ClientHello to detect version rollback attacks (strangely, the
2489                      * protocol does not offer such protection for DH ciphersuites).
2490                      * However, buggy clients exist that send random bytes instead of
2491                      * the protocol version.
2492                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2493                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2494                      */
2495                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2496                         {
2497                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2498                                SSL_AD_DECODE_ERROR);
2499                         goto err;
2500                         }
2501                     }
2502
2503                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2504
2505                 s->session->master_key_length=
2506                         s->method->ssl3_enc->generate_master_secret(s,
2507                                 s->session->master_key, pms, outl);
2508
2509                 if (kssl_ctx->client_princ)
2510                         {
2511                         size_t len = strlen(kssl_ctx->client_princ);
2512                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2513                                 {
2514                                 s->session->krb5_client_princ_len = len;
2515                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2516                                 }
2517                         }
2518
2519
2520                 /*  Was doing kssl_ctx_free() here,
2521                 **  but it caused problems for apache.
2522                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2523                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2524                 */
2525                 }
2526         else
2527 #endif  /* OPENSSL_NO_KRB5 */
2528
2529 #ifndef OPENSSL_NO_ECDH
2530                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2531                 {
2532                 int ret = 1;
2533                 int field_size = 0;
2534                 const EC_KEY   *tkey;
2535                 const EC_GROUP *group;
2536                 const BIGNUM *priv_key;
2537
2538                 /* initialize structures for server's ECDH key pair */
2539                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2540                         {
2541                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2542                             ERR_R_MALLOC_FAILURE);
2543                         goto err;
2544                         }
2545
2546                 /* Let's get server private key and group information */
2547                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2548                         {
2549                         /* use the certificate */
2550                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2551                         }
2552                 else
2553                         {
2554                         /* use the ephermeral values we saved when
2555                          * generating the ServerKeyExchange msg.
2556                          */
2557                         tkey = s->s3->tmp.ecdh;
2558                         }
2559
2560                 group    = EC_KEY_get0_group(tkey);
2561                 priv_key = EC_KEY_get0_private_key(tkey);
2562
2563                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2564                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2565                         {
2566                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2567                                ERR_R_EC_LIB);
2568                         goto err;
2569                         }
2570
2571                 /* Let's get client's public key */
2572                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2573                         {
2574                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2575                             ERR_R_MALLOC_FAILURE);
2576                         goto err;
2577                         }
2578
2579                 if (n == 0L)
2580                         {
2581                         /* Client Publickey was in Client Certificate */
2582
2583                          if (alg_k & SSL_kEECDH)
2584                                  {
2585                                  al=SSL_AD_HANDSHAKE_FAILURE;
2586                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2587                                  goto f_err;
2588                                  }
2589                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2590                             == NULL) ||
2591                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2592                                 {
2593                                 /* XXX: For now, we do not support client
2594                                  * authentication using ECDH certificates
2595                                  * so this branch (n == 0L) of the code is
2596                                  * never executed. When that support is
2597                                  * added, we ought to ensure the key
2598                                  * received in the certificate is
2599                                  * authorized for key agreement.
2600                                  * ECDH_compute_key implicitly checks that
2601                                  * the two ECDH shares are for the same
2602                                  * group.
2603                                  */
2604                                 al=SSL_AD_HANDSHAKE_FAILURE;
2605                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2606                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2607                                 goto f_err;
2608                                 }
2609
2610                         if (EC_POINT_copy(clnt_ecpoint,
2611                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2612                                 {
2613                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2614                                         ERR_R_EC_LIB);
2615                                 goto err;
2616                                 }
2617                         ret = 2; /* Skip certificate verify processing */
2618                         }
2619                 else
2620                         {
2621                         /* Get client's public key from encoded point
2622                          * in the ClientKeyExchange message.
2623                          */
2624                         if ((bn_ctx = BN_CTX_new()) == NULL)
2625                                 {
2626                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2627                                     ERR_R_MALLOC_FAILURE);
2628                                 goto err;
2629                                 }
2630
2631                         /* Get encoded point length */
2632                         i = *p;
2633                         p += 1;
2634                         if (n != 1 + i)
2635                                 {
2636                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2637                                     ERR_R_EC_LIB);
2638                                 goto err;
2639                                 }
2640                         if (EC_POINT_oct2point(group,
2641                             clnt_ecpoint, p, i, bn_ctx) == 0)
2642                                 {
2643                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2644                                     ERR_R_EC_LIB);
2645                                 goto err;
2646                                 }
2647                         /* p is pointing to somewhere in the buffer
2648                          * currently, so set it to the start
2649                          */
2650                         p=(unsigned char *)s->init_buf->data;
2651                         }
2652
2653                 /* Compute the shared pre-master secret */
2654                 field_size = EC_GROUP_get_degree(group);
2655                 if (field_size <= 0)
2656                         {
2657                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2658                                ERR_R_ECDH_LIB);
2659                         goto err;
2660                         }
2661                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2662                 if (i <= 0)
2663                         {
2664                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2665                             ERR_R_ECDH_LIB);
2666                         goto err;
2667                         }
2668
2669                 EVP_PKEY_free(clnt_pub_pkey);
2670                 EC_POINT_free(clnt_ecpoint);
2671                 EC_KEY_free(srvr_ecdh);
2672                 BN_CTX_free(bn_ctx);
2673                 EC_KEY_free(s->s3->tmp.ecdh);
2674                 s->s3->tmp.ecdh = NULL;
2675
2676                 /* Compute the master secret */
2677                 s->session->master_key_length = s->method->ssl3_enc-> \
2678                     generate_master_secret(s, s->session->master_key, p, i);
2679
2680                 OPENSSL_cleanse(p, i);
2681                 return (ret);
2682                 }
2683         else
2684 #endif
2685 #ifndef OPENSSL_NO_PSK
2686                 if (alg_k & SSL_kPSK)
2687                         {
2688                         unsigned char *t = NULL;
2689                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2690                         unsigned int pre_ms_len = 0, psk_len = 0;
2691                         int psk_err = 1;
2692                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2693
2694                         al=SSL_AD_HANDSHAKE_FAILURE;
2695
2696                         n2s(p,i);
2697                         if (n != i+2)
2698                                 {
2699                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2700                                         SSL_R_LENGTH_MISMATCH);
2701                                 goto psk_err;
2702                                 }
2703                         if (i > PSK_MAX_IDENTITY_LEN)
2704                                 {
2705                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2706                                         SSL_R_DATA_LENGTH_TOO_LONG);
2707                                 goto psk_err;
2708                                 }
2709                         if (s->psk_server_callback == NULL)
2710                                 {
2711                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2712                                        SSL_R_PSK_NO_SERVER_CB);
2713                                 goto psk_err;
2714                                 }
2715
2716                         /* Create guaranteed NULL-terminated identity
2717                          * string for the callback */
2718                         memcpy(tmp_id, p, i);
2719                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2720                         psk_len = s->psk_server_callback(s, tmp_id,
2721                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2722                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2723
2724                         if (psk_len > PSK_MAX_PSK_LEN)
2725                                 {
2726                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2727                                         ERR_R_INTERNAL_ERROR);
2728                                 goto psk_err;
2729                                 }
2730                         else if (psk_len == 0)
2731                                 {
2732                                 /* PSK related to the given identity not found */
2733                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2734                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2735                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2736                                 goto psk_err;
2737                                 }
2738
2739                         /* create PSK pre_master_secret */
2740                         pre_ms_len=2+psk_len+2+psk_len;
2741                         t = psk_or_pre_ms;
2742                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2743                         s2n(psk_len, t);
2744                         memset(t, 0, psk_len);
2745                         t+=psk_len;
2746                         s2n(psk_len, t);
2747
2748                         if (s->session->psk_identity != NULL)
2749                                 OPENSSL_free(s->session->psk_identity);
2750                         s->session->psk_identity = BUF_strdup((char *)p);
2751                         if (s->session->psk_identity == NULL)
2752                                 {
2753                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2754                                         ERR_R_MALLOC_FAILURE);
2755                                 goto psk_err;
2756                                 }
2757
2758                         if (s->session->psk_identity_hint != NULL)
2759                                 OPENSSL_free(s->session->psk_identity_hint);
2760                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2761                         if (s->ctx->psk_identity_hint != NULL &&
2762                                 s->session->psk_identity_hint == NULL)
2763                                 {
2764                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2765                                         ERR_R_MALLOC_FAILURE);
2766                                 goto psk_err;
2767                                 }
2768
2769                         s->session->master_key_length=
2770                                 s->method->ssl3_enc->generate_master_secret(s,
2771                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2772                         psk_err = 0;
2773                 psk_err:
2774                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2775                         if (psk_err != 0)
2776                                 goto f_err;
2777                         }
2778                 else
2779 #endif
2780 #ifndef OPENSSL_NO_SRP
2781                 if (alg_k & SSL_kSRP)
2782                         {
2783                         int param_len;
2784
2785                         n2s(p,i);
2786                         param_len=i+2;
2787                         if (param_len > n)
2788                                 {
2789                                 al=SSL_AD_DECODE_ERROR;
2790                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2791                                 goto f_err;
2792                                 }
2793                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2794                                 {
2795                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2796                                 goto err;
2797                                 }
2798                         if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0
2799                                 || BN_is_zero(s->srp_ctx.A))
2800                                 {
2801                                 al=SSL_AD_ILLEGAL_PARAMETER;
2802                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
2803                                 goto f_err;
2804                                 }
2805                         if (s->session->srp_username != NULL)
2806                                 OPENSSL_free(s->session->srp_username);
2807                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2808                         if (s->session->srp_username == NULL)
2809                                 {
2810                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2811                                         ERR_R_MALLOC_FAILURE);
2812                                 goto err;
2813                                 }
2814
2815                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2816                                 {
2817                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2818                                 goto err;
2819                                 }
2820
2821                         p+=i;
2822                         }
2823                 else
2824 #endif  /* OPENSSL_NO_SRP */
2825                 if (alg_k & SSL_kGOST)
2826                         {
2827                         int ret = 0;
2828                         EVP_PKEY_CTX *pkey_ctx;
2829                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2830                         unsigned char premaster_secret[32], *start;
2831                         size_t outlen=32, inlen;
2832                         unsigned long alg_a;
2833                         int Ttag, Tclass;
2834                         long Tlen;
2835
2836                         /* Get our certificate private key*/
2837                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2838                         if (alg_a & SSL_aGOST94)
2839                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2840                         else if (alg_a & SSL_aGOST01)
2841                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2842
2843                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2844                         EVP_PKEY_decrypt_init(pkey_ctx);
2845                         /* If client certificate is present and is of the same type, maybe
2846                          * use it for key exchange.  Don't mind errors from
2847                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2848                          * a client certificate for authorization only. */
2849                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2850                         if (client_pub_pkey)
2851                                 {
2852                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2853                                         ERR_clear_error();
2854                                 }
2855                         /* Decrypt session key */
2856                         if (ASN1_get_object((const unsigned char **)&p, &Tlen, &Ttag, &Tclass, n) != V_ASN1_CONSTRUCTED ||
2857                                 Ttag != V_ASN1_SEQUENCE ||
2858                                 Tclass != V_ASN1_UNIVERSAL)
2859                                 {
2860                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2861                                 goto gerr;
2862                                 }
2863                         start = p;
2864                         inlen = Tlen;
2865                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
2866
2867                                 {
2868                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2869                                 goto gerr;
2870                                 }
2871                         /* Generate master secret */
2872                         s->session->master_key_length=
2873                                 s->method->ssl3_enc->generate_master_secret(s,
2874                                         s->session->master_key,premaster_secret,32);
2875                         /* Check if pubkey from client certificate was used */
2876                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2877                                 ret = 2;
2878                         else
2879                                 ret = 1;
2880                 gerr:
2881                         EVP_PKEY_free(client_pub_pkey);
2882                         EVP_PKEY_CTX_free(pkey_ctx);
2883                         if (ret)
2884                                 return ret;
2885                         else
2886                                 goto err;
2887                         }
2888                 else
2889                 {
2890                 al=SSL_AD_HANDSHAKE_FAILURE;
2891                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2892                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2893                 goto f_err;
2894                 }
2895
2896         return(1);
2897 f_err:
2898         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2899 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
2900 err:
2901 #endif
2902 #ifndef OPENSSL_NO_ECDH
2903         EVP_PKEY_free(clnt_pub_pkey);
2904         EC_POINT_free(clnt_ecpoint);
2905         if (srvr_ecdh != NULL)
2906                 EC_KEY_free(srvr_ecdh);
2907         BN_CTX_free(bn_ctx);
2908 #endif
2909         return(-1);
2910         }
2911
2912 int ssl3_get_cert_verify(SSL *s)
2913         {
2914         EVP_PKEY *pkey=NULL;
2915         unsigned char *p;
2916         int al,ok,ret=0;
2917         long n;
2918         int type=0,i,j;
2919         X509 *peer;
2920         const EVP_MD *md = NULL;
2921         EVP_MD_CTX mctx;
2922         EVP_MD_CTX_init(&mctx);
2923
2924         n=s->method->ssl_get_message(s,
2925                 SSL3_ST_SR_CERT_VRFY_A,
2926                 SSL3_ST_SR_CERT_VRFY_B,
2927                 -1,
2928                 SSL3_RT_MAX_PLAIN_LENGTH,
2929                 &ok);
2930
2931         if (!ok) return((int)n);
2932
2933         if (s->session->peer != NULL)
2934                 {
2935                 peer=s->session->peer;
2936                 pkey=X509_get_pubkey(peer);
2937                 type=X509_certificate_type(peer,pkey);
2938                 }
2939         else
2940                 {
2941                 peer=NULL;
2942                 pkey=NULL;
2943                 }
2944
2945         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2946                 {
2947                 s->s3->tmp.reuse_message=1;
2948                 if ((peer != NULL) && (type & EVP_PKT_SIGN))
2949                         {
2950                         al=SSL_AD_UNEXPECTED_MESSAGE;
2951                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2952                         goto f_err;
2953                         }
2954                 ret=1;
2955                 goto end;
2956                 }
2957
2958         if (peer == NULL)
2959                 {
2960                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2961                 al=SSL_AD_UNEXPECTED_MESSAGE;
2962                 goto f_err;
2963                 }
2964
2965         if (!(type & EVP_PKT_SIGN))
2966                 {
2967                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2968                 al=SSL_AD_ILLEGAL_PARAMETER;
2969                 goto f_err;
2970                 }
2971
2972         if (s->s3->change_cipher_spec)
2973                 {
2974                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2975                 al=SSL_AD_UNEXPECTED_MESSAGE;
2976                 goto f_err;
2977                 }
2978
2979         /* we now have a signature that we need to verify */
2980         p=(unsigned char *)s->init_msg;
2981         /* Check for broken implementations of GOST ciphersuites */
2982         /* If key is GOST and n is exactly 64, it is bare
2983          * signature without length field */
2984         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
2985                 pkey->type == NID_id_GostR3410_2001) )
2986                 {
2987                 i=64;
2988                 }
2989         else
2990                 {
2991                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2992                         {
2993                         int sigalg = tls12_get_sigid(pkey);
2994                         /* Should never happen */
2995                         if (sigalg == -1)
2996                                 {
2997                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2998                                 al=SSL_AD_INTERNAL_ERROR;
2999                                 goto f_err;
3000                                 }
3001                         /* Check key type is consistent with signature */
3002                         if (sigalg != (int)p[1])
3003                                 {
3004                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_TYPE);
3005                                 al=SSL_AD_DECODE_ERROR;
3006                                 goto f_err;
3007                                 }
3008                         md = tls12_get_hash(p[0]);
3009                         if (md == NULL)
3010                                 {
3011                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_UNKNOWN_DIGEST);
3012                                 al=SSL_AD_DECODE_ERROR;
3013                                 goto f_err;
3014                                 }
3015 #ifdef SSL_DEBUG
3016 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3017 #endif
3018                         p += 2;
3019                         n -= 2;
3020                         }
3021                 n2s(p,i);
3022                 n-=2;
3023                 if (i > n)
3024                         {
3025                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3026                         al=SSL_AD_DECODE_ERROR;
3027                         goto f_err;
3028                         }
3029         }
3030         j=EVP_PKEY_size(pkey);
3031         if ((i > j) || (n > j) || (n <= 0))
3032                 {
3033                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3034                 al=SSL_AD_DECODE_ERROR;
3035                 goto f_err;
3036                 }
3037
3038         if (TLS1_get_version(s) >= TLS1_2_VERSION)
3039                 {
3040                 long hdatalen = 0;
3041                 void *hdata;
3042                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3043                 if (hdatalen <= 0)
3044                         {
3045                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3046                         al=SSL_AD_INTERNAL_ERROR;
3047                         goto f_err;
3048                         }
3049 #ifdef SSL_DEBUG
3050                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3051                                                         EVP_MD_name(md));
3052 #endif
3053                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3054                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3055                         {
3056                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3057                         al=SSL_AD_INTERNAL_ERROR;
3058                         goto f_err;
3059                         }
3060
3061                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3062                         {
3063                         al=SSL_AD_DECRYPT_ERROR;
3064                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3065                         goto f_err;
3066                         }
3067                 }
3068         else
3069 #ifndef OPENSSL_NO_RSA
3070         if (pkey->type == EVP_PKEY_RSA)
3071                 {
3072                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3073                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
3074                                                         pkey->pkey.rsa);
3075                 if (i < 0)
3076                         {
3077                         al=SSL_AD_DECRYPT_ERROR;
3078                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3079                         goto f_err;
3080                         }
3081                 if (i == 0)
3082                         {
3083                         al=SSL_AD_DECRYPT_ERROR;
3084                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3085                         goto f_err;
3086                         }
3087                 }
3088         else
3089 #endif
3090 #ifndef OPENSSL_NO_DSA
3091                 if (pkey->type == EVP_PKEY_DSA)
3092                 {
3093                 j=DSA_verify(pkey->save_type,
3094                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3095                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3096                 if (j <= 0)
3097                         {
3098                         /* bad signature */
3099                         al=SSL_AD_DECRYPT_ERROR;
3100                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3101                         goto f_err;
3102                         }
3103                 }
3104         else
3105 #endif
3106 #ifndef OPENSSL_NO_ECDSA
3107                 if (pkey->type == EVP_PKEY_EC)
3108                 {
3109                 j=ECDSA_verify(pkey->save_type,
3110                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3111                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3112                 if (j <= 0)
3113                         {
3114                         /* bad signature */
3115                         al=SSL_AD_DECRYPT_ERROR;
3116                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3117                             SSL_R_BAD_ECDSA_SIGNATURE);
3118                         goto f_err;
3119                         }
3120                 }
3121         else
3122 #endif
3123         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3124                 {   unsigned char signature[64];
3125                         int idx;
3126                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3127                         EVP_PKEY_verify_init(pctx);
3128                         if (i!=64) {
3129                                 fprintf(stderr,"GOST signature length is %d",i);
3130                         }
3131                         for (idx=0;idx<64;idx++) {
3132                                 signature[63-idx]=p[idx];
3133                         }
3134                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3135                         EVP_PKEY_CTX_free(pctx);
3136                         if (j<=0)
3137                                 {
3138                                 al=SSL_AD_DECRYPT_ERROR;
3139                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3140                                         SSL_R_BAD_ECDSA_SIGNATURE);
3141                                 goto f_err;
3142                                 }
3143                 }
3144         else
3145                 {
3146                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3147                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3148                 goto f_err;
3149                 }
3150
3151
3152         ret=1;
3153         if (0)
3154                 {
3155 f_err:
3156                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3157                 }
3158 end:
3159         if (s->s3->handshake_buffer)
3160                 {
3161                 BIO_free(s->s3->handshake_buffer);
3162                 s->s3->handshake_buffer = NULL;
3163                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3164                 }
3165         EVP_MD_CTX_cleanup(&mctx);
3166         EVP_PKEY_free(pkey);
3167         return(ret);
3168         }
3169
3170 int ssl3_get_client_certificate(SSL *s)
3171         {
3172         int i,ok,al,ret= -1;
3173         X509 *x=NULL;
3174         unsigned long l,nc,llen,n;
3175         const unsigned char *p,*q;
3176         unsigned char *d;
3177         STACK_OF(X509) *sk=NULL;
3178
3179         n=s->method->ssl_get_message(s,
3180                 SSL3_ST_SR_CERT_A,
3181                 SSL3_ST_SR_CERT_B,
3182                 -1,
3183                 s->max_cert_list,
3184                 &ok);
3185
3186         if (!ok) return((int)n);
3187
3188         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3189                 {
3190                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3191                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3192                         {
3193                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3194                         al=SSL_AD_HANDSHAKE_FAILURE;
3195                         goto f_err;
3196                         }
3197                 /* If tls asked for a client cert, the client must return a 0 list */
3198                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3199                         {
3200                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3201                         al=SSL_AD_UNEXPECTED_MESSAGE;
3202                         goto f_err;
3203                         }
3204                 s->s3->tmp.reuse_message=1;
3205                 return(1);
3206                 }
3207
3208         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3209                 {
3210                 al=SSL_AD_UNEXPECTED_MESSAGE;
3211                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3212                 goto f_err;
3213                 }
3214         p=d=(unsigned char *)s->init_msg;
3215
3216         if ((sk=sk_X509_new_null()) == NULL)
3217                 {
3218                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3219                 goto err;
3220                 }
3221
3222         n2l3(p,llen);
3223         if (llen+3 != n)
3224                 {
3225                 al=SSL_AD_DECODE_ERROR;
3226                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3227                 goto f_err;
3228                 }
3229         for (nc=0; nc<llen; )
3230                 {
3231                 n2l3(p,l);
3232                 if ((l+nc+3) > llen)
3233                         {
3234                         al=SSL_AD_DECODE_ERROR;
3235                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3236                         goto f_err;
3237                         }
3238
3239                 q=p;
3240                 x=d2i_X509(NULL,&p,l);
3241                 if (x == NULL)
3242                         {
3243                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3244                         goto err;
3245                         }
3246                 if (p != (q+l))
3247                         {
3248                         al=SSL_AD_DECODE_ERROR;
3249                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3250                         goto f_err;
3251                         }
3252                 if (!sk_X509_push(sk,x))
3253                         {
3254                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3255                         goto err;
3256                         }
3257                 x=NULL;
3258                 nc+=l+3;
3259                 }
3260
3261         if (sk_X509_num(sk) <= 0)
3262                 {
3263                 /* TLS does not mind 0 certs returned */
3264                 if (s->version == SSL3_VERSION)
3265                         {
3266                         al=SSL_AD_HANDSHAKE_FAILURE;
3267                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3268                         goto f_err;
3269                         }
3270                 /* Fail for TLS only if we required a certificate */
3271                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3272                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3273                         {
3274                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3275                         al=SSL_AD_HANDSHAKE_FAILURE;
3276                         goto f_err;
3277                         }
3278                 /* No client certificate so digest cached records */
3279                 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s))
3280                         {
3281                         al=SSL_AD_INTERNAL_ERROR;
3282                         goto f_err;
3283                         }
3284                 }
3285         else
3286                 {
3287                 i=ssl_verify_cert_chain(s,sk);
3288                 if (i <= 0)
3289                         {
3290                         al=ssl_verify_alarm_type(s->verify_result);
3291                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
3292                         goto f_err;
3293                         }
3294                 }
3295
3296         if (s->session->peer != NULL) /* This should not be needed */
3297                 X509_free(s->session->peer);
3298         s->session->peer=sk_X509_shift(sk);
3299         s->session->verify_result = s->verify_result;
3300
3301         /* With the current implementation, sess_cert will always be NULL
3302          * when we arrive here. */
3303         if (s->session->sess_cert == NULL)
3304                 {
3305                 s->session->sess_cert = ssl_sess_cert_new();
3306                 if (s->session->sess_cert == NULL)
3307                         {
3308                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3309                         goto err;
3310                         }
3311                 }
3312         if (s->session->sess_cert->cert_chain != NULL)
3313                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3314         s->session->sess_cert->cert_chain=sk;
3315         /* Inconsistency alert: cert_chain does *not* include the
3316          * peer's own certificate, while we do include it in s3_clnt.c */
3317
3318         sk=NULL;
3319
3320         ret=1;
3321         if (0)
3322                 {
3323 f_err:
3324                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3325                 }
3326 err:
3327         if (x != NULL) X509_free(x);
3328         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3329         return(ret);
3330         }
3331
3332 int ssl3_send_server_certificate(SSL *s)
3333         {
3334         unsigned long l;
3335         X509 *x;
3336
3337         if (s->state == SSL3_ST_SW_CERT_A)
3338                 {
3339                 x=ssl_get_server_send_cert(s);
3340                 if (x == NULL)
3341                         {
3342                         /* VRS: allow null cert if auth == KRB5 */
3343                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3344                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3345                                 {
3346                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3347                                 return(0);
3348                                 }
3349                         }
3350
3351                 l=ssl3_output_cert_chain(s,x);
3352                 s->state=SSL3_ST_SW_CERT_B;
3353                 s->init_num=(int)l;
3354                 s->init_off=0;
3355                 }
3356
3357         /* SSL3_ST_SW_CERT_B */
3358         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3359         }
3360
3361 #ifndef OPENSSL_NO_TLSEXT
3362 /* send a new session ticket (not necessarily for a new session) */
3363 int ssl3_send_newsession_ticket(SSL *s)
3364         {
3365         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3366                 {
3367                 unsigned char *p, *senc, *macstart;
3368                 const unsigned char *const_p;
3369                 int len, slen_full, slen;
3370                 SSL_SESSION *sess;
3371                 unsigned int hlen;
3372                 EVP_CIPHER_CTX ctx;
3373                 HMAC_CTX hctx;
3374                 SSL_CTX *tctx = s->initial_ctx;
3375                 unsigned char iv[EVP_MAX_IV_LENGTH];
3376                 unsigned char key_name[16];
3377
3378                 /* get session encoding length */
3379                 slen_full = i2d_SSL_SESSION(s->session, NULL);
3380                 /* Some length values are 16 bits, so forget it if session is
3381                  * too long
3382                  */
3383                 if (slen_full > 0xFF00)
3384                         return -1;
3385                 senc = OPENSSL_malloc(slen_full);
3386                 if (!senc)
3387                         return -1;
3388                 p = senc;
3389                 i2d_SSL_SESSION(s->session, &p);
3390
3391                 /* create a fresh copy (not shared with other threads) to clean up */
3392                 const_p = senc;
3393                 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3394                 if (sess == NULL)
3395                         {
3396                         OPENSSL_free(senc);
3397                         return -1;
3398                         }
3399                 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
3400
3401                 slen = i2d_SSL_SESSION(sess, NULL);
3402                 if (slen > slen_full) /* shouldn't ever happen */
3403                         {
3404                         OPENSSL_free(senc);
3405                         return -1;
3406                         }
3407                 p = senc;
3408                 i2d_SSL_SESSION(sess, &p);
3409                 SSL_SESSION_free(sess);
3410
3411                 /* Grow buffer if need be: the length calculation is as
3412                  * follows 1 (size of message name) + 3 (message length
3413                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
3414                  * 16 (key name) + max_iv_len (iv length) +
3415                  * session_length + max_enc_block_size (max encrypted session
3416                  * length) + max_md_size (HMAC).
3417                  */
3418                 if (!BUF_MEM_grow(s->init_buf,
3419                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
3420                         EVP_MAX_MD_SIZE + slen))
3421                         return -1;
3422
3423                 p=(unsigned char *)s->init_buf->data;
3424                 /* do the header */
3425                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
3426                 /* Skip message length for now */
3427                 p += 3;
3428                 EVP_CIPHER_CTX_init(&ctx);
3429                 HMAC_CTX_init(&hctx);
3430                 /* Initialize HMAC and cipher contexts. If callback present
3431                  * it does all the work otherwise use generated values
3432                  * from parent ctx.
3433                  */
3434                 if (tctx->tlsext_ticket_key_cb)
3435                         {
3436                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3437                                                          &hctx, 1) < 0)
3438                                 {
3439                                 OPENSSL_free(senc);
3440                                 return -1;
3441                                 }
3442                         }
3443                 else
3444                         {
3445                         RAND_pseudo_bytes(iv, 16);
3446                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3447                                         tctx->tlsext_tick_aes_key, iv);
3448                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3449                                         tlsext_tick_md(), NULL);
3450                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3451                         }
3452
3453                 /* Ticket lifetime hint (advisory only):
3454                  * We leave this unspecified for resumed session (for simplicity),
3455                  * and guess that tickets for new sessions will live as long
3456                  * as their sessions. */
3457                 l2n(s->hit ? 0 : s->session->timeout, p);
3458
3459                 /* Skip ticket length for now */
3460                 p += 2;
3461                 /* Output key name */
3462                 macstart = p;
3463                 memcpy(p, key_name, 16);
3464                 p += 16;
3465                 /* output IV */
3466                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3467                 p += EVP_CIPHER_CTX_iv_length(&ctx);
3468                 /* Encrypt session data */
3469                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3470                 p += len;
3471                 EVP_EncryptFinal(&ctx, p, &len);
3472                 p += len;
3473                 EVP_CIPHER_CTX_cleanup(&ctx);
3474
3475                 HMAC_Update(&hctx, macstart, p - macstart);
3476                 HMAC_Final(&hctx, p, &hlen);
3477                 HMAC_CTX_cleanup(&hctx);
3478
3479                 p += hlen;
3480                 /* Now write out lengths: p points to end of data written */
3481                 /* Total length */
3482                 len = p - (unsigned char *)s->init_buf->data;
3483                 p=(unsigned char *)s->init_buf->data + 1;
3484                 l2n3(len - 4, p); /* Message length */
3485                 p += 4;
3486                 s2n(len - 10, p);  /* Ticket length */
3487
3488                 /* number of bytes to write */
3489                 s->init_num= len;
3490                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3491                 s->init_off=0;
3492                 OPENSSL_free(senc);
3493                 }
3494
3495         /* SSL3_ST_SW_SESSION_TICKET_B */
3496         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3497         }
3498
3499 int ssl3_send_cert_status(SSL *s)
3500         {
3501         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3502                 {
3503                 unsigned char *p;
3504                 /* Grow buffer if need be: the length calculation is as
3505                  * follows 1 (message type) + 3 (message length) +
3506                  * 1 (ocsp response type) + 3 (ocsp response length)
3507                  * + (ocsp response)
3508                  */
3509                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3510                         return -1;
3511
3512                 p=(unsigned char *)s->init_buf->data;
3513
3514                 /* do the header */
3515                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3516                 /* message length */
3517                 l2n3(s->tlsext_ocsp_resplen + 4, p);
3518                 /* status type */
3519                 *(p++)= s->tlsext_status_type;
3520                 /* length of OCSP response */
3521                 l2n3(s->tlsext_ocsp_resplen, p);
3522                 /* actual response */
3523                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3524                 /* number of bytes to write */
3525                 s->init_num = 8 + s->tlsext_ocsp_resplen;
3526                 s->state=SSL3_ST_SW_CERT_STATUS_B;
3527                 s->init_off = 0;
3528                 }
3529
3530         /* SSL3_ST_SW_CERT_STATUS_B */
3531         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3532         }
3533
3534 # ifndef OPENSSL_NO_NEXTPROTONEG
3535 /* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It
3536  * sets the next_proto member in s if found */
3537 int ssl3_get_next_proto(SSL *s)
3538         {
3539         int ok;
3540         int proto_len, padding_len;
3541         long n;
3542         const unsigned char *p;
3543
3544         /* Clients cannot send a NextProtocol message if we didn't see the
3545          * extension in their ClientHello */
3546         if (!s->s3->next_proto_neg_seen)
3547                 {
3548                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION);
3549                 return -1;
3550                 }
3551
3552         n=s->method->ssl_get_message(s,
3553                 SSL3_ST_SR_NEXT_PROTO_A,
3554                 SSL3_ST_SR_NEXT_PROTO_B,
3555                 SSL3_MT_NEXT_PROTO,
3556                 514,  /* See the payload format below */
3557                 &ok);
3558
3559         if (!ok)
3560                 return((int)n);
3561
3562         /* s->state doesn't reflect whether ChangeCipherSpec has been received
3563          * in this handshake, but s->s3->change_cipher_spec does (will be reset
3564          * by ssl3_get_finished). */
3565         if (!s->s3->change_cipher_spec)
3566                 {
3567                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS);
3568                 return -1;
3569                 }
3570
3571         if (n < 2)
3572                 return 0;  /* The body must be > 1 bytes long */
3573
3574         p=(unsigned char *)s->init_msg;
3575
3576         /* The payload looks like:
3577          *   uint8 proto_len;
3578          *   uint8 proto[proto_len];
3579          *   uint8 padding_len;
3580          *   uint8 padding[padding_len];
3581          */
3582         proto_len = p[0];
3583         if (proto_len + 2 > s->init_num)
3584                 return 0;
3585         padding_len = p[proto_len + 1];
3586         if (proto_len + padding_len + 2 != s->init_num)
3587                 return 0;
3588
3589         s->next_proto_negotiated = OPENSSL_malloc(proto_len);
3590         if (!s->next_proto_negotiated)
3591                 {
3592                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,ERR_R_MALLOC_FAILURE);
3593                 return 0;
3594                 }
3595         memcpy(s->next_proto_negotiated, p + 1, proto_len);
3596         s->next_proto_negotiated_len = proto_len;
3597
3598         return 1;
3599         }
3600 # endif
3601 #endif