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|SSL_aKRB5|SSL_aSRP))
 414                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 415                                 {
 416                                 ret=ssl3_send_server_certificate(s);
 417                                 if (ret <= 0) goto end;
 418 #ifndef OPENSSL_NO_TLSEXT
 419                                 if (s->tlsext_status_expected)
 420                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 421                                 else
 422                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 423                                 }
 424                         else
 425                                 {
 426                                 skip = 1;
 427                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 428                                 }
 429 #else
 430                                 }
 431                         else
 432                                 skip=1;
 433
 434                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 435 #endif
 436                         s->init_num=0;
 437                         break;
 438
 439                 case SSL3_ST_SW_KEY_EXCH_A:
 440                 case SSL3_ST_SW_KEY_EXCH_B:
 441                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 442
 443                         /* clear this, it may get reset by
 444                          * send_server_key_exchange */
 445                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 446 #ifndef OPENSSL_NO_KRB5
 447                                 && !(alg_k & SSL_kKRB5)
 448 #endif /* OPENSSL_NO_KRB5 */
 449                                 )
 450                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 451                                  * even when forbidden by protocol specs
 452                                  * (handshake may fail as clients are not required to
 453                                  * be able to handle this) */
 454                                 s->s3->tmp.use_rsa_tmp=1;
 455                         else
 456                                 s->s3->tmp.use_rsa_tmp=0;
 457
 458
 459                         /* only send if a DH key exchange, fortezza or
 460                          * RSA but we have a sign only certificate
 461                          *
 462                          * PSK: may send PSK identity hints
 463                          *
 464                          * For ECC ciphersuites, we send a serverKeyExchange
 465                          * message only if the cipher suite is either
 466                          * ECDH-anon or ECDHE. In other cases, the
 467                          * server certificate contains the server's
 468                          * public key for key exchange.
 469                          */
 470                         if (s->s3->tmp.use_rsa_tmp
 471                         /* PSK: send ServerKeyExchange if PSK identity
 472                          * hint if provided */
 473 #ifndef OPENSSL_NO_PSK
 474                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 475 #endif
 476 #ifndef OPENSSL_NO_SRP
 477                             /* SRP: send ServerKeyExchange */
 478                             || (alg_k & SSL_kSRP)
 479 #endif
 480                             || (alg_k & (SSL_kDHr|SSL_kDHd|SSL_kEDH))
 481                             || (alg_k & SSL_kEECDH)
 482                             || ((alg_k & SSL_kRSA)
 483                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 484                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 485                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 486                                         )
 487                                     )
 488                                 )
 489                             )
 490                                 {
 491                                 ret=ssl3_send_server_key_exchange(s);
 492                                 if (ret <= 0) goto end;
 493                                 }
 494                         else
 495                                 skip=1;
 496
 497                         s->state=SSL3_ST_SW_CERT_REQ_A;
 498                         s->init_num=0;
 499                         break;
 500
 501                 case SSL3_ST_SW_CERT_REQ_A:
 502                 case SSL3_ST_SW_CERT_REQ_B:
 503                         if (/* don't request cert unless asked for it: */
 504                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 505                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 506                                  * don't request cert during re-negotiation: */
 507                                 ((s->session->peer != NULL) &&
 508                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 509                                 /* never request cert in anonymous ciphersuites
 510                                  * (see section "Certificate request" in SSL 3 drafts
 511                                  * and in RFC 2246): */
 512                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 513                                  /* ... except when the application insists on verification
 514                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 515                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 516                                  /* never request cert in Kerberos ciphersuites */
 517                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) ||
 518                                 /* don't request certificate for SRP auth */
 519                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP)
 520                                 /* With normal PSK Certificates and
 521                                  * Certificate Requests are omitted */
 522                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 523                                 {
 524                                 /* no cert request */
 525                                 skip=1;
 526                                 s->s3->tmp.cert_request=0;
 527                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 528                                 if (s->s3->handshake_buffer)
 529                                         if (!ssl3_digest_cached_records(s))
 530                                                 return -1;
 531                                 }
 532                         else
 533                                 {
 534                                 s->s3->tmp.cert_request=1;
 535                                 ret=ssl3_send_certificate_request(s);
 536                                 if (ret <= 0) goto end;
 537 #ifndef NETSCAPE_HANG_BUG
 538                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 539 #else
 540                                 s->state=SSL3_ST_SW_FLUSH;
 541                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 542 #endif
 543                                 s->init_num=0;
 544                                 }
 545                         break;
 546
 547                 case SSL3_ST_SW_SRVR_DONE_A:
 548                 case SSL3_ST_SW_SRVR_DONE_B:
 549                         ret=ssl3_send_server_done(s);
 550                         if (ret <= 0) goto end;
 551                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 552                         s->state=SSL3_ST_SW_FLUSH;
 553                         s->init_num=0;
 554                         break;
 555
 556                 case SSL3_ST_SW_FLUSH:
 557
 558                         /* This code originally checked to see if
 559                          * any data was pending using BIO_CTRL_INFO
 560                          * and then flushed. This caused problems
 561                          * as documented in PR#1939. The proposed
 562                          * fix doesn't completely resolve this issue
 563                          * as buggy implementations of BIO_CTRL_PENDING
 564                          * still exist. So instead we just flush
 565                          * unconditionally.
 566                          */
 567
 568                         s->rwstate=SSL_WRITING;
 569                         if (BIO_flush(s->wbio) <= 0)
 570                                 {
 571                                 ret= -1;
 572                                 goto end;
 573                                 }
 574                         s->rwstate=SSL_NOTHING;
 575
 576                         s->state=s->s3->tmp.next_state;
 577                         break;
 578
 579                 case SSL3_ST_SR_CERT_A:
 580                 case SSL3_ST_SR_CERT_B:
 581                         /* Check for second client hello (MS SGC) */
 582                         ret = ssl3_check_client_hello(s);
 583                         if (ret <= 0)
 584                                 goto end;
 585                         if (ret == 2)
 586                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 587                         else {
 588                                 if (s->s3->tmp.cert_request)
 589                                         {
 590                                         ret=ssl3_get_client_certificate(s);
 591                                         if (ret <= 0) goto end;
 592                                         }
 593                                 s->init_num=0;
 594                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 595                         }
 596                         break;
 597
 598                 case SSL3_ST_SR_KEY_EXCH_A:
 599                 case SSL3_ST_SR_KEY_EXCH_B:
 600                         ret=ssl3_get_client_key_exchange(s);
 601                         if (ret <= 0)
 602                                 goto end;
 603                         if (ret == 2)
 604                                 {
 605                                 /* For the ECDH ciphersuites when
 606                                  * the client sends its ECDH pub key in
 607                                  * a certificate, the CertificateVerify
 608                                  * message is not sent.
 609                                  * Also for GOST ciphersuites when
 610                                  * the client uses its key from the certificate
 611                                  * for key exchange.
 612                                  */
 613 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 614                                 s->state=SSL3_ST_SR_FINISHED_A;
 615 #else
 616                                 if (s->s3->next_proto_neg_seen)
 617                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
 618                                 else
 619                                         s->state=SSL3_ST_SR_FINISHED_A;
 620 #endif
 621                                 s->init_num = 0;
 622                                 }
 623                         else if (TLS1_get_version(s) >= TLS1_2_VERSION)
 624                                 {
 625                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 626                                 s->init_num=0;
 627                                 if (!s->session->peer)
 628                                         break;
 629                                 /* For TLS v1.2 freeze the handshake buffer
 630                                  * at this point and digest cached records.
 631                                  */
 632                                 if (!s->s3->handshake_buffer)
 633                                         {
 634                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
 635                                         return -1;
 636                                         }
 637                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
 638                                 if (!ssl3_digest_cached_records(s))
 639                                         return -1;
 640                                 }
 641                         else
 642                                 {
 643                                 int offset=0;
 644                                 int dgst_num;
 645
 646                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 647                                 s->init_num=0;
 648
 649                                 /* We need to get hashes here so if there is
 650                                  * a client cert, it can be verified
 651                                  * FIXME - digest processing for CertificateVerify
 652                                  * should be generalized. But it is next step
 653                                  */
 654                                 if (s->s3->handshake_buffer)
 655                                         if (!ssl3_digest_cached_records(s))
 656                                                 return -1;
 657                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
 658                                         if (s->s3->handshake_dgst[dgst_num])
 659                                                 {
 660                                                 int dgst_size;
 661
 662                                                 s->method->ssl3_enc->cert_verify_mac(s,EVP_MD_CTX_type(s->s3->handshake_dgst[dgst_num]),&(s->s3->tmp.cert_verify_md[offset]));
 663                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
 664                                                 if (dgst_size < 0)
 665                                                         {
 666                                                         ret = -1;
 667                                                         goto end;
 668                                                         }
 669                                                 offset+=dgst_size;
 670                                                 }
 671                                 }
 672                         break;
 673
 674                 case SSL3_ST_SR_CERT_VRFY_A:
 675                 case SSL3_ST_SR_CERT_VRFY_B:
 676
 677                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 678                         /* we should decide if we expected this one */
 679                         ret=ssl3_get_cert_verify(s);
 680                         if (ret <= 0) goto end;
 681
 682 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 683                         s->state=SSL3_ST_SR_FINISHED_A;
 684 #else
 685                         if (s->s3->next_proto_neg_seen)
 686                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
 687                         else
 688                                 s->state=SSL3_ST_SR_FINISHED_A;
 689 #endif
 690                         s->init_num=0;
 691                         break;
 692
 693 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 694                 case SSL3_ST_SR_NEXT_PROTO_A:
 695                 case SSL3_ST_SR_NEXT_PROTO_B:
 696                         ret=ssl3_get_next_proto(s);
 697                         if (ret <= 0) goto end;
 698                         s->init_num = 0;
 699                         s->state=SSL3_ST_SR_FINISHED_A;
 700                         break;
 701 #endif
 702
 703                 case SSL3_ST_SR_FINISHED_A:
 704                 case SSL3_ST_SR_FINISHED_B:
 705                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 706                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 707                                 SSL3_ST_SR_FINISHED_B);
 708                         if (ret <= 0) goto end;
 709                         if (s->hit)
 710                                 s->state=SSL_ST_OK;
 711 #ifndef OPENSSL_NO_TLSEXT
 712                         else if (s->tlsext_ticket_expected)
 713                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 714 #endif
 715                         else
 716                                 s->state=SSL3_ST_SW_CHANGE_A;
 717                         s->init_num=0;
 718                         break;
 719
 720 #ifndef OPENSSL_NO_TLSEXT
 721                 case SSL3_ST_SW_SESSION_TICKET_A:
 722                 case SSL3_ST_SW_SESSION_TICKET_B:
 723                         ret=ssl3_send_newsession_ticket(s);
 724                         if (ret <= 0) goto end;
 725                         s->state=SSL3_ST_SW_CHANGE_A;
 726                         s->init_num=0;
 727                         break;
 728
 729                 case SSL3_ST_SW_CERT_STATUS_A:
 730                 case SSL3_ST_SW_CERT_STATUS_B:
 731                         ret=ssl3_send_cert_status(s);
 732                         if (ret <= 0) goto end;
 733                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 734                         s->init_num=0;
 735                         break;
 736
 737 #endif
 738
 739                 case SSL3_ST_SW_CHANGE_A:
 740                 case SSL3_ST_SW_CHANGE_B:
 741
 742                         s->session->cipher=s->s3->tmp.new_cipher;
 743                         if (!s->method->ssl3_enc->setup_key_block(s))
 744                                 { ret= -1; goto end; }
 745
 746                         ret=ssl3_send_change_cipher_spec(s,
 747                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 748
 749                         if (ret <= 0) goto end;
 750                         s->state=SSL3_ST_SW_FINISHED_A;
 751                         s->init_num=0;
 752
 753                         if (!s->method->ssl3_enc->change_cipher_state(s,
 754                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 755                                 {
 756                                 ret= -1;
 757                                 goto end;
 758                                 }
 759
 760                         break;
 761
 762                 case SSL3_ST_SW_FINISHED_A:
 763                 case SSL3_ST_SW_FINISHED_B:
 764                         ret=ssl3_send_finished(s,
 765                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 766                                 s->method->ssl3_enc->server_finished_label,
 767                                 s->method->ssl3_enc->server_finished_label_len);
 768                         if (ret <= 0) goto end;
 769                         s->state=SSL3_ST_SW_FLUSH;
 770                         if (s->hit)
 771                                 {
 772 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 773                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 774 #else
 775                                 if (s->s3->next_proto_neg_seen)
 776                                         {
 777                                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 778                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
 779                                         }
 780                                 else
 781                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 782 #endif
 783                                 }
 784                         else
 785                                 s->s3->tmp.next_state=SSL_ST_OK;
 786                         s->init_num=0;
 787                         break;
 788
 789                 case SSL_ST_OK:
 790                         /* clean a few things up */
 791                         ssl3_cleanup_key_block(s);
 792
 793                         BUF_MEM_free(s->init_buf);
 794                         s->init_buf=NULL;
 795
 796                         /* remove buffering on output */
 797                         ssl_free_wbio_buffer(s);
 798
 799                         s->init_num=0;
 800
 801                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
 802                                 {
 803                                 s->renegotiate=0;
 804                                 s->new_session=0;
 805
 806                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 807
 808                                 s->ctx->stats.sess_accept_good++;
 809                                 /* s->server=1; */
 810                                 s->handshake_func=ssl3_accept;
 811
 812                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 813                                 }
 814
 815                         ret = 1;
 816                         goto end;
 817                         /* break; */
 818
 819                 default:
 820                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 821                         ret= -1;
 822                         goto end;
 823                         /* break; */
 824                         }
 825
 826                 if (!s->s3->tmp.reuse_message && !skip)
 827                         {
 828                         if (s->debug)
 829                                 {
 830                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 831                                         goto end;
 832                                 }
 833
 834
 835                         if ((cb != NULL) && (s->state != state))
 836                                 {
 837                                 new_state=s->state;
 838                                 s->state=state;
 839                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 840                                 s->state=new_state;
 841                                 }
 842                         }
 843                 skip=0;
 844                 }
 845 end:
 846         /* BIO_flush(s->wbio); */
 847
 848         s->in_handshake--;
 849         if (cb != NULL)
 850                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 851         return(ret);
 852         }
 853
 854 int ssl3_send_hello_request(SSL *s)
 855         {
 856         unsigned char *p;
 857
 858         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 859                 {
 860                 p=(unsigned char *)s->init_buf->data;
 861                 *(p++)=SSL3_MT_HELLO_REQUEST;
 862                 *(p++)=0;
 863                 *(p++)=0;
 864                 *(p++)=0;
 865
 866                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 867                 /* number of bytes to write */
 868                 s->init_num=4;
 869                 s->init_off=0;
 870                 }
 871
 872         /* SSL3_ST_SW_HELLO_REQ_B */
 873         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 874         }
 875
 876 int ssl3_check_client_hello(SSL *s)
 877         {
 878         int ok;
 879         long n;
 880
 881         /* this function is called when we really expect a Certificate message,
 882          * so permit appropriate message length */
 883         n=s->method->ssl_get_message(s,
 884                 SSL3_ST_SR_CERT_A,
 885                 SSL3_ST_SR_CERT_B,
 886                 -1,
 887                 s->max_cert_list,
 888                 &ok);
 889         if (!ok) return((int)n);
 890         s->s3->tmp.reuse_message = 1;
 891         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 892                 {
 893                 /* We only allow the client to restart the handshake once per
 894                  * negotiation. */
 895                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
 896                         {
 897                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
 898                         return -1;
 899                         }
 900                 /* Throw away what we have done so far in the current handshake,
 901                  * which will now be aborted. (A full SSL_clear would be too much.) */
 902 #ifndef OPENSSL_NO_DH
 903                 if (s->s3->tmp.dh != NULL)
 904                         {
 905                         DH_free(s->s3->tmp.dh);
 906                         s->s3->tmp.dh = NULL;
 907                         }
 908 #endif
 909 #ifndef OPENSSL_NO_ECDH
 910                 if (s->s3->tmp.ecdh != NULL)
 911                         {
 912                         EC_KEY_free(s->s3->tmp.ecdh);
 913                         s->s3->tmp.ecdh = NULL;
 914                         }
 915 #endif
 916                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
 917                 return 2;
 918                 }
 919         return 1;
 920 }
 921
 922 int ssl3_get_client_hello(SSL *s)
 923         {
 924         int i,j,ok,al,ret= -1;
 925         unsigned int cookie_len;
 926         long n;
 927         unsigned long id;
 928         unsigned char *p,*d,*q;
 929         SSL_CIPHER *c;
 930 #ifndef OPENSSL_NO_COMP
 931         SSL_COMP *comp=NULL;
 932 #endif
 933         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 934
 935         /* We do this so that we will respond with our native type.
 936          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 937          * This down switching should be handled by a different method.
 938          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 939          * TLSv1.
 940          */
 941         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
 942                 )
 943                 {
 944                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 945                 }
 946         s->first_packet=1;
 947         n=s->method->ssl_get_message(s,
 948                 SSL3_ST_SR_CLNT_HELLO_B,
 949                 SSL3_ST_SR_CLNT_HELLO_C,
 950                 SSL3_MT_CLIENT_HELLO,
 951                 SSL3_RT_MAX_PLAIN_LENGTH,
 952                 &ok);
 953
 954         if (!ok) return((int)n);
 955         s->first_packet=0;
 956         d=p=(unsigned char *)s->init_msg;
 957
 958         /* use version from inside client hello, not from record header
 959          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 960         s->client_version=(((int)p[0])<<8)|(int)p[1];
 961         p+=2;
 962
 963         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 964             (s->version != DTLS1_VERSION && s->client_version < s->version))
 965                 {
 966                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 967                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR &&
 968                         !s->enc_write_ctx && !s->write_hash)
 969                         {
 970                         /* similar to ssl3_get_record, send alert using remote version number */
 971                         s->version = s->client_version;
 972                         }
 973                 al = SSL_AD_PROTOCOL_VERSION;
 974                 goto f_err;
 975                 }
 976
 977         /* If we require cookies and this ClientHello doesn't
 978          * contain one, just return since we do not want to
 979          * allocate any memory yet. So check cookie length...
 980          */
 981         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
 982                 {
 983                 unsigned int session_length, cookie_length;
 984
 985                 session_length = *(p + SSL3_RANDOM_SIZE);
 986                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
 987
 988                 if (cookie_length == 0)
 989                         return 1;
 990                 }
 991
 992         /* load the client random */
 993         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 994         p+=SSL3_RANDOM_SIZE;
 995
 996         /* get the session-id */
 997         j= *(p++);
 998
 999         s->hit=0;
1000         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
1001          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
1002          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
1003          * than a change to default behavior so that applications relying on this for security
1004          * won't even compile against older library versions).
1005          *
1006          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1007          * renegotiation but not a new session (s->new_session remains unset): for servers,
1008          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1009          * setting will be ignored.
1010          */
1011         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1012                 {
1013                 if (!ssl_get_new_session(s,1))
1014                         goto err;
1015                 }
1016         else
1017                 {
1018                 i=ssl_get_prev_session(s, p, j, d + n);
1019                 if (i == 1)
1020                         { /* previous session */
1021                         s->hit=1;
1022                         }
1023                 else if (i == -1)
1024                         goto err;
1025                 else /* i == 0 */
1026                         {
1027                         if (!ssl_get_new_session(s,1))
1028                                 goto err;
1029                         }
1030                 }
1031
1032         p+=j;
1033
1034         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
1035                 {
1036                 /* cookie stuff */
1037                 cookie_len = *(p++);
1038
1039                 /*
1040                  * The ClientHello may contain a cookie even if the
1041                  * HelloVerify message has not been sent--make sure that it
1042                  * does not cause an overflow.
1043                  */
1044                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1045                         {
1046                         /* too much data */
1047                         al = SSL_AD_DECODE_ERROR;
1048                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1049                         goto f_err;
1050                         }
1051
1052                 /* verify the cookie if appropriate option is set. */
1053                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1054                         cookie_len > 0)
1055                         {
1056                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1057
1058                         if ( s->ctx->app_verify_cookie_cb != NULL)
1059                                 {
1060                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1061                                         cookie_len) == 0)
1062                                         {
1063                                         al=SSL_AD_HANDSHAKE_FAILURE;
1064                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1065                                                 SSL_R_COOKIE_MISMATCH);
1066                                         goto f_err;
1067                                         }
1068                                 /* else cookie verification succeeded */
1069                                 }
1070                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
1071                                                   s->d1->cookie_len) != 0) /* default verification */
1072                                 {
1073                                         al=SSL_AD_HANDSHAKE_FAILURE;
1074                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1075                                                 SSL_R_COOKIE_MISMATCH);
1076                                         goto f_err;
1077                                 }
1078
1079                         ret = 2;
1080                         }
1081
1082                 p += cookie_len;
1083                 }
1084
1085         n2s(p,i);
1086         if ((i == 0) && (j != 0))
1087                 {
1088                 /* we need a cipher if we are not resuming a session */
1089                 al=SSL_AD_ILLEGAL_PARAMETER;
1090                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1091                 goto f_err;
1092                 }
1093         if ((p+i) >= (d+n))
1094                 {
1095                 /* not enough data */
1096                 al=SSL_AD_DECODE_ERROR;
1097                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1098                 goto f_err;
1099                 }
1100         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1101                 == NULL))
1102                 {
1103                 goto err;
1104                 }
1105         p+=i;
1106
1107         /* If it is a hit, check that the cipher is in the list */
1108         if ((s->hit) && (i > 0))
1109                 {
1110                 j=0;
1111                 id=s->session->cipher->id;
1112
1113 #ifdef CIPHER_DEBUG
1114                 printf("client sent %d ciphers\n",sk_num(ciphers));
1115 #endif
1116                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1117                         {
1118                         c=sk_SSL_CIPHER_value(ciphers,i);
1119 #ifdef CIPHER_DEBUG
1120                         printf("client [%2d of %2d]:%s\n",
1121                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1122 #endif
1123                         if (c->id == id)
1124                                 {
1125                                 j=1;
1126                                 break;
1127                                 }
1128                         }
1129 /* Disabled because it can be used in a ciphersuite downgrade
1130  * attack: CVE-2010-4180.
1131  */
1132 #if 0
1133                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1134                         {
1135                         /* Special case as client bug workaround: the previously used cipher may
1136                          * not be in the current list, the client instead might be trying to
1137                          * continue using a cipher that before wasn't chosen due to server
1138                          * preferences.  We'll have to reject the connection if the cipher is not
1139                          * enabled, though. */
1140                         c = sk_SSL_CIPHER_value(ciphers, 0);
1141                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1142                                 {
1143                                 s->session->cipher = c;
1144                                 j = 1;
1145                                 }
1146                         }
1147 #endif
1148                 if (j == 0)
1149                         {
1150                         /* we need to have the cipher in the cipher
1151                          * list if we are asked to reuse it */
1152                         al=SSL_AD_ILLEGAL_PARAMETER;
1153                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1154                         goto f_err;
1155                         }
1156                 }
1157
1158         /* compression */
1159         i= *(p++);
1160         if ((p+i) > (d+n))
1161                 {
1162                 /* not enough data */
1163                 al=SSL_AD_DECODE_ERROR;
1164                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1165                 goto f_err;
1166                 }
1167         q=p;
1168         for (j=0; j<i; j++)
1169                 {
1170                 if (p[j] == 0) break;
1171                 }
1172
1173         p+=i;
1174         if (j >= i)
1175                 {
1176                 /* no compress */
1177                 al=SSL_AD_DECODE_ERROR;
1178                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1179                 goto f_err;
1180                 }
1181
1182 #ifndef OPENSSL_NO_TLSEXT
1183         /* TLS extensions*/
1184         if (s->version >= SSL3_VERSION)
1185                 {
1186                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1187                         {
1188                         /* 'al' set by ssl_parse_clienthello_tlsext */
1189                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1190                         goto f_err;
1191                         }
1192                 }
1193                 if (ssl_check_clienthello_tlsext_early(s) <= 0) {
1194                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1195                         goto err;
1196                 }
1197
1198         /* Check if we want to use external pre-shared secret for this
1199          * handshake for not reused session only. We need to generate
1200          * server_random before calling tls_session_secret_cb in order to allow
1201          * SessionTicket processing to use it in key derivation. */
1202         {
1203                 unsigned char *pos;
1204                 pos=s->s3->server_random;
1205                 if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0)
1206                         {
1207                         al=SSL_AD_INTERNAL_ERROR;
1208                         goto f_err;
1209                         }
1210         }
1211
1212         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1213                 {
1214                 SSL_CIPHER *pref_cipher=NULL;
1215
1216                 s->session->master_key_length=sizeof(s->session->master_key);
1217                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1218                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1219                         {
1220                         s->hit=1;
1221                         s->session->ciphers=ciphers;
1222                         s->session->verify_result=X509_V_OK;
1223
1224                         ciphers=NULL;
1225
1226                         /* check if some cipher was preferred by call back */
1227                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1228                         if (pref_cipher == NULL)
1229                                 {
1230                                 al=SSL_AD_HANDSHAKE_FAILURE;
1231                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1232                                 goto f_err;
1233                                 }
1234
1235                         s->session->cipher=pref_cipher;
1236
1237                         if (s->cipher_list)
1238                                 sk_SSL_CIPHER_free(s->cipher_list);
1239
1240                         if (s->cipher_list_by_id)
1241                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1242
1243                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1244                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1245                         }
1246                 }
1247 #endif
1248
1249         /* Worst case, we will use the NULL compression, but if we have other
1250          * options, we will now look for them.  We have i-1 compression
1251          * algorithms from the client, starting at q. */
1252         s->s3->tmp.new_compression=NULL;
1253 #ifndef OPENSSL_NO_COMP
1254         /* This only happens if we have a cache hit */
1255         if (s->session->compress_meth != 0)
1256                 {
1257                 int m, comp_id = s->session->compress_meth;
1258                 /* Perform sanity checks on resumed compression algorithm */
1259                 /* Can't disable compression */
1260                 if (s->options & SSL_OP_NO_COMPRESSION)
1261                         {
1262                         al=SSL_AD_INTERNAL_ERROR;
1263                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1264                         goto f_err;
1265                         }
1266                 /* Look for resumed compression method */
1267                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1268                         {
1269                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1270                         if (comp_id == comp->id)
1271                                 {
1272                                 s->s3->tmp.new_compression=comp;
1273                                 break;
1274                                 }
1275                         }
1276                 if (s->s3->tmp.new_compression == NULL)
1277                         {
1278                         al=SSL_AD_INTERNAL_ERROR;
1279                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1280                         goto f_err;
1281                         }
1282                 /* Look for resumed method in compression list */
1283                 for (m = 0; m < i; m++)
1284                         {
1285                         if (q[m] == comp_id)
1286                                 break;
1287                         }
1288                 if (m >= i)
1289                         {
1290                         al=SSL_AD_ILLEGAL_PARAMETER;
1291                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1292                         goto f_err;
1293                         }
1294                 }
1295         else if (s->hit)
1296                 comp = NULL;
1297         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1298                 { /* See if we have a match */
1299                 int m,nn,o,v,done=0;
1300
1301                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1302                 for (m=0; m<nn; m++)
1303                         {
1304                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1305                         v=comp->id;
1306                         for (o=0; o<i; o++)
1307                                 {
1308                                 if (v == q[o])
1309                                         {
1310                                         done=1;
1311                                         break;
1312                                         }
1313                                 }
1314                         if (done) break;
1315                         }
1316                 if (done)
1317                         s->s3->tmp.new_compression=comp;
1318                 else
1319                         comp=NULL;
1320                 }
1321 #else
1322         /* If compression is disabled we'd better not try to resume a session
1323          * using compression.
1324          */
1325         if (s->session->compress_meth != 0)
1326                 {
1327                 al=SSL_AD_INTERNAL_ERROR;
1328                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1329                 goto f_err;
1330                 }
1331 #endif
1332
1333         /* Given s->session->ciphers and SSL_get_ciphers, we must
1334          * pick a cipher */
1335
1336         if (!s->hit)
1337                 {
1338 #ifdef OPENSSL_NO_COMP
1339                 s->session->compress_meth=0;
1340 #else
1341                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1342 #endif
1343                 if (s->session->ciphers != NULL)
1344                         sk_SSL_CIPHER_free(s->session->ciphers);
1345                 s->session->ciphers=ciphers;
1346                 if (ciphers == NULL)
1347                         {
1348                         al=SSL_AD_ILLEGAL_PARAMETER;
1349                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1350                         goto f_err;
1351                         }
1352                 ciphers=NULL;
1353                 c=ssl3_choose_cipher(s,s->session->ciphers,
1354                                      SSL_get_ciphers(s));
1355
1356                 if (c == NULL)
1357                         {
1358                         al=SSL_AD_HANDSHAKE_FAILURE;
1359                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1360                         goto f_err;
1361                         }
1362                 s->s3->tmp.new_cipher=c;
1363                 }
1364         else
1365                 {
1366                 /* Session-id reuse */
1367 #ifdef REUSE_CIPHER_BUG
1368                 STACK_OF(SSL_CIPHER) *sk;
1369                 SSL_CIPHER *nc=NULL;
1370                 SSL_CIPHER *ec=NULL;
1371
1372                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1373                         {
1374                         sk=s->session->ciphers;
1375                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1376                                 {
1377                                 c=sk_SSL_CIPHER_value(sk,i);
1378                                 if (c->algorithm_enc & SSL_eNULL)
1379                                         nc=c;
1380                                 if (SSL_C_IS_EXPORT(c))
1381                                         ec=c;
1382                                 }
1383                         if (nc != NULL)
1384                                 s->s3->tmp.new_cipher=nc;
1385                         else if (ec != NULL)
1386                                 s->s3->tmp.new_cipher=ec;
1387                         else
1388                                 s->s3->tmp.new_cipher=s->session->cipher;
1389                         }
1390                 else
1391 #endif
1392                 s->s3->tmp.new_cipher=s->session->cipher;
1393                 }
1394
1395         if (TLS1_get_version(s) < TLS1_2_VERSION || !(s->verify_mode & SSL_VERIFY_PEER))
1396                 {
1397                 if (!ssl3_digest_cached_records(s))
1398                         {
1399                         al = SSL_AD_INTERNAL_ERROR;
1400                         goto f_err;
1401                         }
1402                 }
1403
1404         /* we now have the following setup.
1405          * client_random
1406          * cipher_list          - our prefered list of ciphers
1407          * ciphers              - the clients prefered list of ciphers
1408          * compression          - basically ignored right now
1409          * ssl version is set   - sslv3
1410          * s->session           - The ssl session has been setup.
1411          * s->hit               - session reuse flag
1412          * s->tmp.new_cipher    - the new cipher to use.
1413          */
1414
1415         /* Handles TLS extensions that we couldn't check earlier */
1416         if (s->version >= SSL3_VERSION)
1417                 {
1418                 if (ssl_check_clienthello_tlsext_late(s) <= 0)
1419                         {
1420                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1421                         goto err;
1422                         }
1423                 }
1424
1425         if (ret < 0) ret=1;
1426         if (0)
1427                 {
1428 f_err:
1429                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1430                 }
1431 err:
1432         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1433         return(ret);
1434         }
1435
1436 int ssl3_send_server_hello(SSL *s)
1437         {
1438         unsigned char *buf;
1439         unsigned char *p,*d;
1440         int i,sl;
1441         unsigned long l;
1442
1443         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1444                 {
1445                 buf=(unsigned char *)s->init_buf->data;
1446 #ifdef OPENSSL_NO_TLSEXT
1447                 p=s->s3->server_random;
1448                 if (ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE) <= 0)
1449                         return -1;
1450 #endif
1451                 /* Do the message type and length last */
1452                 d=p= &(buf[4]);
1453
1454                 *(p++)=s->version>>8;
1455                 *(p++)=s->version&0xff;
1456
1457                 /* Random stuff */
1458                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1459                 p+=SSL3_RANDOM_SIZE;
1460
1461                 /* There are several cases for the session ID to send
1462                  * back in the server hello:
1463                  * - For session reuse from the session cache,
1464                  *   we send back the old session ID.
1465                  * - If stateless session reuse (using a session ticket)
1466                  *   is successful, we send back the client's "session ID"
1467                  *   (which doesn't actually identify the session).
1468                  * - If it is a new session, we send back the new
1469                  *   session ID.
1470                  * - However, if we want the new session to be single-use,
1471                  *   we send back a 0-length session ID.
1472                  * s->hit is non-zero in either case of session reuse,
1473                  * so the following won't overwrite an ID that we're supposed
1474                  * to send back.
1475                  */
1476                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1477                         && !s->hit)
1478                         s->session->session_id_length=0;
1479
1480                 sl=s->session->session_id_length;
1481                 if (sl > (int)sizeof(s->session->session_id))
1482                         {
1483                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1484                         return -1;
1485                         }
1486                 *(p++)=sl;
1487                 memcpy(p,s->session->session_id,sl);
1488                 p+=sl;
1489
1490                 /* put the cipher */
1491                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1492                 p+=i;
1493
1494                 /* put the compression method */
1495 #ifdef OPENSSL_NO_COMP
1496                         *(p++)=0;
1497 #else
1498                 if (s->s3->tmp.new_compression == NULL)
1499                         *(p++)=0;
1500                 else
1501                         *(p++)=s->s3->tmp.new_compression->id;
1502 #endif
1503 #ifndef OPENSSL_NO_TLSEXT
1504                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1505                         {
1506                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1507                         return -1;
1508                         }
1509                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1510                         {
1511                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1512                         return -1;
1513                         }
1514 #endif
1515                 /* do the header */
1516                 l=(p-d);
1517                 d=buf;
1518                 *(d++)=SSL3_MT_SERVER_HELLO;
1519                 l2n3(l,d);
1520
1521                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1522                 /* number of bytes to write */
1523                 s->init_num=p-buf;
1524                 s->init_off=0;
1525                 }
1526
1527         /* SSL3_ST_SW_SRVR_HELLO_B */
1528         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1529         }
1530
1531 int ssl3_send_server_done(SSL *s)
1532         {
1533         unsigned char *p;
1534
1535         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1536                 {
1537                 p=(unsigned char *)s->init_buf->data;
1538
1539                 /* do the header */
1540                 *(p++)=SSL3_MT_SERVER_DONE;
1541                 *(p++)=0;
1542                 *(p++)=0;
1543                 *(p++)=0;
1544
1545                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1546                 /* number of bytes to write */
1547                 s->init_num=4;
1548                 s->init_off=0;
1549                 }
1550
1551         /* SSL3_ST_SW_SRVR_DONE_B */
1552         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1553         }
1554
1555 int ssl3_send_server_key_exchange(SSL *s)
1556         {
1557 #ifndef OPENSSL_NO_RSA
1558         unsigned char *q;
1559         int j,num;
1560         RSA *rsa;
1561         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1562         unsigned int u;
1563 #endif
1564 #ifndef OPENSSL_NO_DH
1565         DH *dh=NULL,*dhp;
1566 #endif
1567 #ifndef OPENSSL_NO_ECDH
1568         EC_KEY *ecdh=NULL, *ecdhp;
1569         unsigned char *encodedPoint = NULL;
1570         int encodedlen = 0;
1571         int curve_id = 0;
1572         BN_CTX *bn_ctx = NULL;
1573 #endif
1574         EVP_PKEY *pkey;
1575         const EVP_MD *md = NULL;
1576         unsigned char *p,*d;
1577         int al,i;
1578         unsigned long type;
1579         int n;
1580         CERT *cert;
1581         BIGNUM *r[4];
1582         int nr[4],kn;
1583         BUF_MEM *buf;
1584         EVP_MD_CTX md_ctx;
1585
1586         EVP_MD_CTX_init(&md_ctx);
1587         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1588                 {
1589                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1590                 cert=s->cert;
1591
1592                 buf=s->init_buf;
1593
1594                 r[0]=r[1]=r[2]=r[3]=NULL;
1595                 n=0;
1596 #ifndef OPENSSL_NO_RSA
1597                 if (type & SSL_kRSA)
1598                         {
1599                         rsa=cert->rsa_tmp;
1600                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1601                                 {
1602                                 rsa=s->cert->rsa_tmp_cb(s,
1603                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1604                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1605                                 if(rsa == NULL)
1606                                 {
1607                                         al=SSL_AD_HANDSHAKE_FAILURE;
1608                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1609                                         goto f_err;
1610                                 }
1611                                 RSA_up_ref(rsa);
1612                                 cert->rsa_tmp=rsa;
1613                                 }
1614                         if (rsa == NULL)
1615                                 {
1616                                 al=SSL_AD_HANDSHAKE_FAILURE;
1617                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1618                                 goto f_err;
1619                                 }
1620                         r[0]=rsa->n;
1621                         r[1]=rsa->e;
1622                         s->s3->tmp.use_rsa_tmp=1;
1623                         }
1624                 else
1625 #endif
1626 #ifndef OPENSSL_NO_DH
1627                         if (type & SSL_kEDH)
1628                         {
1629                         dhp=cert->dh_tmp;
1630                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1631                                 dhp=s->cert->dh_tmp_cb(s,
1632                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1633                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1634                         if (dhp == NULL)
1635                                 {
1636                                 al=SSL_AD_HANDSHAKE_FAILURE;
1637                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1638                                 goto f_err;
1639                                 }
1640
1641                         if (s->s3->tmp.dh != NULL)
1642                                 {
1643                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1644                                 goto err;
1645                                 }
1646
1647                         if ((dh=DHparams_dup(dhp)) == NULL)
1648                                 {
1649                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1650                                 goto err;
1651                                 }
1652
1653                         s->s3->tmp.dh=dh;
1654                         if ((dhp->pub_key == NULL ||
1655                              dhp->priv_key == NULL ||
1656                              (s->options & SSL_OP_SINGLE_DH_USE)))
1657                                 {
1658                                 if(!DH_generate_key(dh))
1659                                     {
1660                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1661                                            ERR_R_DH_LIB);
1662                                     goto err;
1663                                     }
1664                                 }
1665                         else
1666                                 {
1667                                 dh->pub_key=BN_dup(dhp->pub_key);
1668                                 dh->priv_key=BN_dup(dhp->priv_key);
1669                                 if ((dh->pub_key == NULL) ||
1670                                         (dh->priv_key == NULL))
1671                                         {
1672                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1673                                         goto err;
1674                                         }
1675                                 }
1676                         r[0]=dh->p;
1677                         r[1]=dh->g;
1678                         r[2]=dh->pub_key;
1679                         }
1680                 else
1681 #endif
1682 #ifndef OPENSSL_NO_ECDH
1683                         if (type & SSL_kEECDH)
1684                         {
1685                         const EC_GROUP *group;
1686
1687                         ecdhp=cert->ecdh_tmp;
1688                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1689                                 {
1690                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1691                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1692                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1693                                 }
1694                         if (ecdhp == NULL)
1695                                 {
1696                                 al=SSL_AD_HANDSHAKE_FAILURE;
1697                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1698                                 goto f_err;
1699                                 }
1700
1701                         if (s->s3->tmp.ecdh != NULL)
1702                                 {
1703                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1704                                 goto err;
1705                                 }
1706
1707                         /* Duplicate the ECDH structure. */
1708                         if (ecdhp == NULL)
1709                                 {
1710                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1711                                 goto err;
1712                                 }
1713                         if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1714                                 {
1715                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1716                                 goto err;
1717                                 }
1718
1719                         s->s3->tmp.ecdh=ecdh;
1720                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1721                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1722                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1723                                 {
1724                                 if(!EC_KEY_generate_key(ecdh))
1725                                     {
1726                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1727                                     goto err;
1728                                     }
1729                                 }
1730
1731                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1732                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1733                             (EC_KEY_get0_private_key(ecdh) == NULL))
1734                                 {
1735                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1736                                 goto err;
1737                                 }
1738
1739                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1740                             (EC_GROUP_get_degree(group) > 163))
1741                                 {
1742                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1743                                 goto err;
1744                                 }
1745
1746                         /* XXX: For now, we only support ephemeral ECDH
1747                          * keys over named (not generic) curves. For
1748                          * supported named curves, curve_id is non-zero.
1749                          */
1750                         if ((curve_id =
1751                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1752                             == 0)
1753                                 {
1754                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1755                                 goto err;
1756                                 }
1757
1758                         /* Encode the public key.
1759                          * First check the size of encoding and
1760                          * allocate memory accordingly.
1761                          */
1762                         encodedlen = EC_POINT_point2oct(group,
1763                             EC_KEY_get0_public_key(ecdh),
1764                             POINT_CONVERSION_UNCOMPRESSED,
1765                             NULL, 0, NULL);
1766
1767                         encodedPoint = (unsigned char *)
1768                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1769                         bn_ctx = BN_CTX_new();
1770                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1771                                 {
1772                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1773                                 goto err;
1774                                 }
1775
1776
1777                         encodedlen = EC_POINT_point2oct(group,
1778                             EC_KEY_get0_public_key(ecdh),
1779                             POINT_CONVERSION_UNCOMPRESSED,
1780                             encodedPoint, encodedlen, bn_ctx);
1781
1782                         if (encodedlen == 0)
1783                                 {
1784                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1785                                 goto err;
1786                                 }
1787
1788                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1789
1790                         /* XXX: For now, we only support named (not
1791                          * generic) curves in ECDH ephemeral key exchanges.
1792                          * In this situation, we need four additional bytes
1793                          * to encode the entire ServerECDHParams
1794                          * structure.
1795                          */
1796                         n = 4 + encodedlen;
1797
1798                         /* We'll generate the serverKeyExchange message
1799                          * explicitly so we can set these to NULLs
1800                          */
1801                         r[0]=NULL;
1802                         r[1]=NULL;
1803                         r[2]=NULL;
1804                         r[3]=NULL;
1805                         }
1806                 else
1807 #endif /* !OPENSSL_NO_ECDH */
1808 #ifndef OPENSSL_NO_PSK
1809                         if (type & SSL_kPSK)
1810                                 {
1811                                 /* reserve size for record length and PSK identity hint*/
1812                                 n+=2+strlen(s->ctx->psk_identity_hint);
1813                                 }
1814                         else
1815 #endif /* !OPENSSL_NO_PSK */
1816 #ifndef OPENSSL_NO_SRP
1817                 if (type & SSL_kSRP)
1818                         {
1819                         if ((s->srp_ctx.N == NULL) ||
1820                                 (s->srp_ctx.g == NULL) ||
1821                                 (s->srp_ctx.s == NULL) ||
1822                                 (s->srp_ctx.B == NULL))
1823                                 {
1824                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1825                                 goto err;
1826                                 }
1827                         r[0]=s->srp_ctx.N;
1828                         r[1]=s->srp_ctx.g;
1829                         r[2]=s->srp_ctx.s;
1830                         r[3]=s->srp_ctx.B;
1831                         }
1832                 else
1833 #endif
1834                         {
1835                         al=SSL_AD_HANDSHAKE_FAILURE;
1836                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1837                         goto f_err;
1838                         }
1839                 for (i=0; i < 4 && r[i] != NULL; i++)
1840                         {
1841                         nr[i]=BN_num_bytes(r[i]);
1842 #ifndef OPENSSL_NO_SRP
1843                         if ((i == 2) && (type & SSL_kSRP))
1844                                 n+=1+nr[i];
1845                         else
1846 #endif
1847                         n+=2+nr[i];
1848                         }
1849
1850                 if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP))
1851                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1852                         {
1853                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1854                                 == NULL)
1855                                 {
1856                                 al=SSL_AD_DECODE_ERROR;
1857                                 goto f_err;
1858                                 }
1859                         kn=EVP_PKEY_size(pkey);
1860                         }
1861                 else
1862                         {
1863                         pkey=NULL;
1864                         kn=0;
1865                         }
1866
1867                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1868                         {
1869                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1870                         goto err;
1871                         }
1872                 d=(unsigned char *)s->init_buf->data;
1873                 p= &(d[4]);
1874
1875                 for (i=0; i < 4 && r[i] != NULL; i++)
1876                         {
1877 #ifndef OPENSSL_NO_SRP
1878                         if ((i == 2) && (type & SSL_kSRP))
1879                                 {
1880                                 *p = nr[i];
1881                                 p++;
1882                                 }
1883                         else
1884 #endif
1885                         s2n(nr[i],p);
1886                         BN_bn2bin(r[i],p);
1887                         p+=nr[i];
1888                         }
1889
1890 #ifndef OPENSSL_NO_ECDH
1891                 if (type & SSL_kEECDH)
1892                         {
1893                         /* XXX: For now, we only support named (not generic) curves.
1894                          * In this situation, the serverKeyExchange message has:
1895                          * [1 byte CurveType], [2 byte CurveName]
1896                          * [1 byte length of encoded point], followed by
1897                          * the actual encoded point itself
1898                          */
1899                         *p = NAMED_CURVE_TYPE;
1900                         p += 1;
1901                         *p = 0;
1902                         p += 1;
1903                         *p = curve_id;
1904                         p += 1;
1905                         *p = encodedlen;
1906                         p += 1;
1907                         memcpy((unsigned char*)p,
1908                             (unsigned char *)encodedPoint,
1909                             encodedlen);
1910                         OPENSSL_free(encodedPoint);
1911                         encodedPoint = NULL;
1912                         p += encodedlen;
1913                         }
1914 #endif
1915
1916 #ifndef OPENSSL_NO_PSK
1917                 if (type & SSL_kPSK)
1918                         {
1919                         /* copy PSK identity hint */
1920                         s2n(strlen(s->ctx->psk_identity_hint), p);
1921                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1922                         p+=strlen(s->ctx->psk_identity_hint);
1923                         }
1924 #endif
1925
1926                 /* not anonymous */
1927                 if (pkey != NULL)
1928                         {
1929                         /* n is the length of the params, they start at &(d[4])
1930                          * and p points to the space at the end. */
1931 #ifndef OPENSSL_NO_RSA
1932                         if (pkey->type == EVP_PKEY_RSA
1933                                         && TLS1_get_version(s) < TLS1_2_VERSION)
1934                                 {
1935                                 q=md_buf;
1936                                 j=0;
1937                                 for (num=2; num > 0; num--)
1938                                         {
1939                                         EVP_MD_CTX_set_flags(&md_ctx,
1940                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1941                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1942                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1943                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1944                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1945                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1946                                         EVP_DigestFinal_ex(&md_ctx,q,
1947                                                 (unsigned int *)&i);
1948                                         q+=i;
1949                                         j+=i;
1950                                         }
1951                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1952                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1953                                         {
1954                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1955                                         goto err;
1956                                         }
1957                                 s2n(u,p);
1958                                 n+=u+2;
1959                                 }
1960                         else
1961 #endif
1962                         if (md)
1963                                 {
1964                                 /* For TLS1.2 and later send signature
1965                                  * algorithm */
1966                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1967                                         {
1968                                         if (!tls12_get_sigandhash(p, pkey, md))
1969                                                 {
1970                                                 /* Should never happen */
1971                                                 al=SSL_AD_INTERNAL_ERROR;
1972                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1973                                                 goto f_err;
1974                                                 }
1975                                         p+=2;
1976                                         }
1977 #ifdef SSL_DEBUG
1978                                 fprintf(stderr, "Using hash %s\n",
1979                                                         EVP_MD_name(md));
1980 #endif
1981                                 EVP_SignInit_ex(&md_ctx, md, NULL);
1982                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1983                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1984                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1985                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1986                                         (unsigned int *)&i,pkey))
1987                                         {
1988                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
1989                                         goto err;
1990                                         }
1991                                 s2n(i,p);
1992                                 n+=i+2;
1993                                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1994                                         n+= 2;
1995                                 }
1996                         else
1997                                 {
1998                                 /* Is this error check actually needed? */
1999                                 al=SSL_AD_HANDSHAKE_FAILURE;
2000                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2001                                 goto f_err;
2002                                 }
2003                         }
2004
2005                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
2006                 l2n3(n,d);
2007
2008                 /* we should now have things packed up, so lets send
2009                  * it off */
2010                 s->init_num=n+4;
2011                 s->init_off=0;
2012                 }
2013
2014         s->state = SSL3_ST_SW_KEY_EXCH_B;
2015         EVP_MD_CTX_cleanup(&md_ctx);
2016         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2017 f_err:
2018         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2019 err:
2020 #ifndef OPENSSL_NO_ECDH
2021         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2022         BN_CTX_free(bn_ctx);
2023 #endif
2024         EVP_MD_CTX_cleanup(&md_ctx);
2025         return(-1);
2026         }
2027
2028 int ssl3_send_certificate_request(SSL *s)
2029         {
2030         unsigned char *p,*d;
2031         int i,j,nl,off,n;
2032         STACK_OF(X509_NAME) *sk=NULL;
2033         X509_NAME *name;
2034         BUF_MEM *buf;
2035
2036         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2037                 {
2038                 buf=s->init_buf;
2039
2040                 d=p=(unsigned char *)&(buf->data[4]);
2041
2042                 /* get the list of acceptable cert types */
2043                 p++;
2044                 n=ssl3_get_req_cert_type(s,p);
2045                 d[0]=n;
2046                 p+=n;
2047                 n++;
2048
2049                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
2050                         {
2051                         nl = tls12_get_req_sig_algs(s, p + 2);
2052                         s2n(nl, p);
2053                         p += nl + 2;
2054                         n += nl + 2;
2055                         }
2056
2057                 off=n;
2058                 p+=2;
2059                 n+=2;
2060
2061                 sk=SSL_get_client_CA_list(s);
2062                 nl=0;
2063                 if (sk != NULL)
2064                         {
2065                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2066                                 {
2067                                 name=sk_X509_NAME_value(sk,i);
2068                                 j=i2d_X509_NAME(name,NULL);
2069                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
2070                                         {
2071                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2072                                         goto err;
2073                                         }
2074                                 p=(unsigned char *)&(buf->data[4+n]);
2075                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2076                                         {
2077                                         s2n(j,p);
2078                                         i2d_X509_NAME(name,&p);
2079                                         n+=2+j;
2080                                         nl+=2+j;
2081                                         }
2082                                 else
2083                                         {
2084                                         d=p;
2085                                         i2d_X509_NAME(name,&p);
2086                                         j-=2; s2n(j,d); j+=2;
2087                                         n+=j;
2088                                         nl+=j;
2089                                         }
2090                                 }
2091                         }
2092                 /* else no CA names */
2093                 p=(unsigned char *)&(buf->data[4+off]);
2094                 s2n(nl,p);
2095
2096                 d=(unsigned char *)buf->data;
2097                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
2098                 l2n3(n,d);
2099
2100                 /* we should now have things packed up, so lets send
2101                  * it off */
2102
2103                 s->init_num=n+4;
2104                 s->init_off=0;
2105 #ifdef NETSCAPE_HANG_BUG
2106                 if (!BUF_MEM_grow_clean(buf, s->init_num + 4))
2107                         {
2108                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2109                         goto err;
2110                         }
2111                 p=(unsigned char *)s->init_buf->data + s->init_num;
2112
2113                 /* do the header */
2114                 *(p++)=SSL3_MT_SERVER_DONE;
2115                 *(p++)=0;
2116                 *(p++)=0;
2117                 *(p++)=0;
2118                 s->init_num += 4;
2119 #endif
2120
2121                 s->state = SSL3_ST_SW_CERT_REQ_B;
2122                 }
2123
2124         /* SSL3_ST_SW_CERT_REQ_B */
2125         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2126 err:
2127         return(-1);
2128         }
2129
2130 int ssl3_get_client_key_exchange(SSL *s)
2131         {
2132         int i,al,ok;
2133         long n;
2134         unsigned long alg_k;
2135         unsigned char *p;
2136 #ifndef OPENSSL_NO_RSA
2137         RSA *rsa=NULL;
2138         EVP_PKEY *pkey=NULL;
2139 #endif
2140 #ifndef OPENSSL_NO_DH
2141         BIGNUM *pub=NULL;
2142         DH *dh_srvr;
2143 #endif
2144 #ifndef OPENSSL_NO_KRB5
2145         KSSL_ERR kssl_err;
2146 #endif /* OPENSSL_NO_KRB5 */
2147
2148 #ifndef OPENSSL_NO_ECDH
2149         EC_KEY *srvr_ecdh = NULL;
2150         EVP_PKEY *clnt_pub_pkey = NULL;
2151         EC_POINT *clnt_ecpoint = NULL;
2152         BN_CTX *bn_ctx = NULL;
2153 #endif
2154
2155         n=s->method->ssl_get_message(s,
2156                 SSL3_ST_SR_KEY_EXCH_A,
2157                 SSL3_ST_SR_KEY_EXCH_B,
2158                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2159                 2048, /* ??? */
2160                 &ok);
2161
2162         if (!ok) return((int)n);
2163         p=(unsigned char *)s->init_msg;
2164
2165         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2166
2167 #ifndef OPENSSL_NO_RSA
2168         if (alg_k & SSL_kRSA)
2169                 {
2170                 unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
2171                 int decrypt_len, decrypt_good_mask;
2172                 unsigned char version_good;
2173
2174                 /* FIX THIS UP EAY EAY EAY EAY */
2175                 if (s->s3->tmp.use_rsa_tmp)
2176                         {
2177                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2178                                 rsa=s->cert->rsa_tmp;
2179                         /* Don't do a callback because rsa_tmp should
2180                          * be sent already */
2181                         if (rsa == NULL)
2182                                 {
2183                                 al=SSL_AD_HANDSHAKE_FAILURE;
2184                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2185                                 goto f_err;
2186
2187                                 }
2188                         }
2189                 else
2190                         {
2191                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2192                         if (    (pkey == NULL) ||
2193                                 (pkey->type != EVP_PKEY_RSA) ||
2194                                 (pkey->pkey.rsa == NULL))
2195                                 {
2196                                 al=SSL_AD_HANDSHAKE_FAILURE;
2197                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2198                                 goto f_err;
2199                                 }
2200                         rsa=pkey->pkey.rsa;
2201                         }
2202
2203                 /* TLS and [incidentally] DTLS{0xFEFF} */
2204                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2205                         {
2206                         n2s(p,i);
2207                         if (n != i+2)
2208                                 {
2209                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2210                                         {
2211                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2212                                         goto err;
2213                                         }
2214                                 else
2215                                         p-=2;
2216                                 }
2217                         else
2218                                 n=i;
2219                         }
2220
2221                 /* We must not leak whether a decryption failure occurs because
2222                  * of Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see
2223                  * RFC 2246, section 7.4.7.1). The code follows that advice of
2224                  * the TLS RFC and generates a random premaster secret for the
2225                  * case that the decrypt fails. See
2226                  * https://tools.ietf.org/html/rfc5246#section-7.4.7.1 */
2227
2228                 /* should be RAND_bytes, but we cannot work around a failure. */
2229                 if (RAND_pseudo_bytes(rand_premaster_secret,
2230                                       sizeof(rand_premaster_secret)) <= 0)
2231                         goto err;
2232                 decrypt_len = RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2233                 ERR_clear_error();
2234
2235                 /* decrypt_len should be SSL_MAX_MASTER_KEY_LENGTH.
2236                  * decrypt_good_mask will be zero if so and non-zero otherwise. */
2237                 decrypt_good_mask = decrypt_len ^ SSL_MAX_MASTER_KEY_LENGTH;
2238
2239                 /* If the version in the decrypted pre-master secret is correct
2240                  * then version_good will be zero. The Klima-Pokorny-Rosa
2241                  * extension of Bleichenbacher's attack
2242                  * (http://eprint.iacr.org/2003/052/) exploits the version
2243                  * number check as a "bad version oracle". Thus version checks
2244                  * are done in constant time and are treated like any other
2245                  * decryption error. */
2246                 version_good = p[0] ^ (s->client_version>>8);
2247                 version_good |= p[1] ^ (s->client_version&0xff);
2248
2249                 /* The premaster secret must contain the same version number as
2250                  * the ClientHello to detect version rollback attacks
2251                  * (strangely, the protocol does not offer such protection for
2252                  * DH ciphersuites). However, buggy clients exist that send the
2253                  * negotiated protocol version instead if the server does not
2254                  * support the requested protocol version. If
2255                  * SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2256                 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
2257                         {
2258                         unsigned char workaround_mask = version_good;
2259                         unsigned char workaround;
2260
2261                         /* workaround_mask will be 0xff if version_good is
2262                          * non-zero (i.e. the version match failed). Otherwise
2263                          * it'll be 0x00. */
2264                         workaround_mask |= workaround_mask >> 4;
2265                         workaround_mask |= workaround_mask >> 2;
2266                         workaround_mask |= workaround_mask >> 1;
2267                         workaround_mask = ~((workaround_mask & 1) - 1);
2268
2269                         workaround = p[0] ^ (s->version>>8);
2270                         workaround |= p[1] ^ (s->version&0xff);
2271
2272                         /* If workaround_mask is 0xff (i.e. there was a version
2273                          * mismatch) then we copy the value of workaround over
2274                          * version_good. */
2275                         version_good = (workaround & workaround_mask) |
2276                                        (version_good & ~workaround_mask);
2277                         }
2278
2279                 /* If any bits in version_good are set then they'll poision
2280                  * decrypt_good_mask and cause rand_premaster_secret to be
2281                  * used. */
2282                 decrypt_good_mask |= version_good;
2283
2284                 /* decrypt_good_mask will be zero iff decrypt_len ==
2285                  * SSL_MAX_MASTER_KEY_LENGTH and the version check passed. We
2286                  * fold the bottom 32 bits of it with an OR so that the LSB
2287                  * will be zero iff everything is good. This assumes that we'll
2288                  * never decrypt a value > 2**31 bytes, which seems safe. */
2289                 decrypt_good_mask |= decrypt_good_mask >> 16;
2290                 decrypt_good_mask |= decrypt_good_mask >> 8;
2291                 decrypt_good_mask |= decrypt_good_mask >> 4;
2292                 decrypt_good_mask |= decrypt_good_mask >> 2;
2293                 decrypt_good_mask |= decrypt_good_mask >> 1;
2294                 /* Now select only the LSB and subtract one. If decrypt_len ==
2295                  * SSL_MAX_MASTER_KEY_LENGTH and the version check passed then
2296                  * decrypt_good_mask will be all ones. Otherwise it'll be all
2297                  * zeros. */
2298                 decrypt_good_mask &= 1;
2299                 decrypt_good_mask--;
2300
2301                 /* Now copy rand_premaster_secret over p using
2302                  * decrypt_good_mask. */
2303                 for (i = 0; i < (int) sizeof(rand_premaster_secret); i++)
2304                         {
2305                         p[i] = (p[i] & decrypt_good_mask) |
2306                                (rand_premaster_secret[i] & ~decrypt_good_mask);
2307                         }
2308
2309                 s->session->master_key_length=
2310                         s->method->ssl3_enc->generate_master_secret(s,
2311                                 s->session->master_key,
2312                                 p,i);
2313                 OPENSSL_cleanse(p,i);
2314                 }
2315         else
2316 #endif
2317 #ifndef OPENSSL_NO_DH
2318                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2319                 {
2320                 n2s(p,i);
2321                 if (n != i+2)
2322                         {
2323                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2324                                 {
2325                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2326                                 goto err;
2327                                 }
2328                         else
2329                                 {
2330                                 p-=2;
2331                                 i=(int)n;
2332                                 }
2333                         }
2334
2335                 if (n == 0L) /* the parameters are in the cert */
2336                         {
2337                         al=SSL_AD_HANDSHAKE_FAILURE;
2338                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
2339                         goto f_err;
2340                         }
2341                 else
2342                         {
2343                         if (s->s3->tmp.dh == NULL)
2344                                 {
2345                                 al=SSL_AD_HANDSHAKE_FAILURE;
2346                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2347                                 goto f_err;
2348                                 }
2349                         else
2350                                 dh_srvr=s->s3->tmp.dh;
2351                         }
2352
2353                 pub=BN_bin2bn(p,i,NULL);
2354                 if (pub == NULL)
2355                         {
2356                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2357                         goto err;
2358                         }
2359
2360                 i=DH_compute_key(p,pub,dh_srvr);
2361
2362                 if (i <= 0)
2363                         {
2364                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2365                         BN_clear_free(pub);
2366                         goto err;
2367                         }
2368
2369                 DH_free(s->s3->tmp.dh);
2370                 s->s3->tmp.dh=NULL;
2371
2372                 BN_clear_free(pub);
2373                 pub=NULL;
2374                 s->session->master_key_length=
2375                         s->method->ssl3_enc->generate_master_secret(s,
2376                                 s->session->master_key,p,i);
2377                 OPENSSL_cleanse(p,i);
2378                 }
2379         else
2380 #endif
2381 #ifndef OPENSSL_NO_KRB5
2382         if (alg_k & SSL_kKRB5)
2383                 {
2384                 krb5_error_code         krb5rc;
2385                 krb5_data               enc_ticket;
2386                 krb5_data               authenticator;
2387                 krb5_data               enc_pms;
2388                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2389                 EVP_CIPHER_CTX          ciph_ctx;
2390                 const EVP_CIPHER        *enc = NULL;
2391                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2392                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2393                                                + EVP_MAX_BLOCK_LENGTH];
2394                 int                  padl, outl;
2395                 krb5_timestamp          authtime = 0;
2396                 krb5_ticket_times       ttimes;
2397
2398                 EVP_CIPHER_CTX_init(&ciph_ctx);
2399
2400                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2401
2402                 n2s(p,i);
2403                 enc_ticket.length = i;
2404
2405                 if (n < (long)(enc_ticket.length + 6))
2406                         {
2407                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2408                                 SSL_R_DATA_LENGTH_TOO_LONG);
2409                         goto err;
2410                         }
2411
2412                 enc_ticket.data = (char *)p;
2413                 p+=enc_ticket.length;
2414
2415                 n2s(p,i);
2416                 authenticator.length = i;
2417
2418                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2419                         {
2420                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2421                                 SSL_R_DATA_LENGTH_TOO_LONG);
2422                         goto err;
2423                         }
2424
2425                 authenticator.data = (char *)p;
2426                 p+=authenticator.length;
2427
2428                 n2s(p,i);
2429                 enc_pms.length = i;
2430                 enc_pms.data = (char *)p;
2431                 p+=enc_pms.length;
2432
2433                 /* Note that the length is checked again below,
2434                 ** after decryption
2435                 */
2436                 if(enc_pms.length > sizeof pms)
2437                         {
2438                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2439                                SSL_R_DATA_LENGTH_TOO_LONG);
2440                         goto err;
2441                         }
2442
2443                 if (n != (long)(enc_ticket.length + authenticator.length +
2444                                                 enc_pms.length + 6))
2445                         {
2446                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2447                                 SSL_R_DATA_LENGTH_TOO_LONG);
2448                         goto err;
2449                         }
2450
2451                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2452                                         &kssl_err)) != 0)
2453                         {
2454 #ifdef KSSL_DEBUG
2455                         printf("kssl_sget_tkt rtn %d [%d]\n",
2456                                 krb5rc, kssl_err.reason);
2457                         if (kssl_err.text)
2458                                 printf("kssl_err text= %s\n", kssl_err.text);
2459 #endif  /* KSSL_DEBUG */
2460                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2461                                 kssl_err.reason);
2462                         goto err;
2463                         }
2464
2465                 /*  Note: no authenticator is not considered an error,
2466                 **  but will return authtime == 0.
2467                 */
2468                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2469                                         &authtime, &kssl_err)) != 0)
2470                         {
2471 #ifdef KSSL_DEBUG
2472                         printf("kssl_check_authent rtn %d [%d]\n",
2473                                 krb5rc, kssl_err.reason);
2474                         if (kssl_err.text)
2475                                 printf("kssl_err text= %s\n", kssl_err.text);
2476 #endif  /* KSSL_DEBUG */
2477                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2478                                 kssl_err.reason);
2479                         goto err;
2480                         }
2481
2482                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2483                         {
2484                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2485                         goto err;
2486                         }
2487
2488 #ifdef KSSL_DEBUG
2489                 kssl_ctx_show(kssl_ctx);
2490 #endif  /* KSSL_DEBUG */
2491
2492                 enc = kssl_map_enc(kssl_ctx->enctype);
2493                 if (enc == NULL)
2494                     goto err;
2495
2496                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2497
2498                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2499                         {
2500                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2501                                 SSL_R_DECRYPTION_FAILED);
2502                         goto err;
2503                         }
2504                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2505                                         (unsigned char *)enc_pms.data, enc_pms.length))
2506                         {
2507                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2508                                 SSL_R_DECRYPTION_FAILED);
2509                         goto err;
2510                         }
2511                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2512                         {
2513                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2514                                 SSL_R_DATA_LENGTH_TOO_LONG);
2515                         goto err;
2516                         }
2517                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2518                         {
2519                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2520                                 SSL_R_DECRYPTION_FAILED);
2521                         goto err;
2522                         }
2523                 outl += padl;
2524                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2525                         {
2526                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2527                                 SSL_R_DATA_LENGTH_TOO_LONG);
2528                         goto err;
2529                         }
2530                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2531                     {
2532                     /* The premaster secret must contain the same version number as the
2533                      * ClientHello to detect version rollback attacks (strangely, the
2534                      * protocol does not offer such protection for DH ciphersuites).
2535                      * However, buggy clients exist that send random bytes instead of
2536                      * the protocol version.
2537                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2538                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2539                      */
2540                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2541                         {
2542                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2543                                SSL_AD_DECODE_ERROR);
2544                         goto err;
2545                         }
2546                     }
2547
2548                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2549
2550                 s->session->master_key_length=
2551                         s->method->ssl3_enc->generate_master_secret(s,
2552                                 s->session->master_key, pms, outl);
2553
2554                 if (kssl_ctx->client_princ)
2555                         {
2556                         size_t len = strlen(kssl_ctx->client_princ);
2557                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2558                                 {
2559                                 s->session->krb5_client_princ_len = len;
2560                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2561                                 }
2562                         }
2563
2564
2565                 /*  Was doing kssl_ctx_free() here,
2566                 **  but it caused problems for apache.
2567                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2568                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2569                 */
2570                 }
2571         else
2572 #endif  /* OPENSSL_NO_KRB5 */
2573
2574 #ifndef OPENSSL_NO_ECDH
2575                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2576                 {
2577                 int ret = 1;
2578                 int field_size = 0;
2579                 const EC_KEY   *tkey;
2580                 const EC_GROUP *group;
2581                 const BIGNUM *priv_key;
2582
2583                 /* initialize structures for server's ECDH key pair */
2584                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2585                         {
2586                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2587                             ERR_R_MALLOC_FAILURE);
2588                         goto err;
2589                         }
2590
2591                 /* Let's get server private key and group information */
2592                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2593                         {
2594                         /* use the certificate */
2595                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2596                         }
2597                 else
2598                         {
2599                         /* use the ephermeral values we saved when
2600                          * generating the ServerKeyExchange msg.
2601                          */
2602                         tkey = s->s3->tmp.ecdh;
2603                         }
2604
2605                 group    = EC_KEY_get0_group(tkey);
2606                 priv_key = EC_KEY_get0_private_key(tkey);
2607
2608                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2609                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2610                         {
2611                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2612                                ERR_R_EC_LIB);
2613                         goto err;
2614                         }
2615
2616                 /* Let's get client's public key */
2617                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2618                         {
2619                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2620                             ERR_R_MALLOC_FAILURE);
2621                         goto err;
2622                         }
2623
2624                 if (n == 0L)
2625                         {
2626                         /* Client Publickey was in Client Certificate */
2627
2628                          if (alg_k & SSL_kEECDH)
2629                                  {
2630                                  al=SSL_AD_HANDSHAKE_FAILURE;
2631                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2632                                  goto f_err;
2633                                  }
2634                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2635                             == NULL) ||
2636                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2637                                 {
2638                                 /* XXX: For now, we do not support client
2639                                  * authentication using ECDH certificates
2640                                  * so this branch (n == 0L) of the code is
2641                                  * never executed. When that support is
2642                                  * added, we ought to ensure the key
2643                                  * received in the certificate is
2644                                  * authorized for key agreement.
2645                                  * ECDH_compute_key implicitly checks that
2646                                  * the two ECDH shares are for the same
2647                                  * group.
2648                                  */
2649                                 al=SSL_AD_HANDSHAKE_FAILURE;
2650                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2651                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2652                                 goto f_err;
2653                                 }
2654
2655                         if (EC_POINT_copy(clnt_ecpoint,
2656                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2657                                 {
2658                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2659                                         ERR_R_EC_LIB);
2660                                 goto err;
2661                                 }
2662                         ret = 2; /* Skip certificate verify processing */
2663                         }
2664                 else
2665                         {
2666                         /* Get client's public key from encoded point
2667                          * in the ClientKeyExchange message.
2668                          */
2669                         if ((bn_ctx = BN_CTX_new()) == NULL)
2670                                 {
2671                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2672                                     ERR_R_MALLOC_FAILURE);
2673                                 goto err;
2674                                 }
2675
2676                         /* Get encoded point length */
2677                         i = *p;
2678                         p += 1;
2679                         if (n != 1 + i)
2680                                 {
2681                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2682                                     ERR_R_EC_LIB);
2683                                 goto err;
2684                                 }
2685                         if (EC_POINT_oct2point(group,
2686                             clnt_ecpoint, p, i, bn_ctx) == 0)
2687                                 {
2688                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2689                                     ERR_R_EC_LIB);
2690                                 goto err;
2691                                 }
2692                         /* p is pointing to somewhere in the buffer
2693                          * currently, so set it to the start
2694                          */
2695                         p=(unsigned char *)s->init_buf->data;
2696                         }
2697
2698                 /* Compute the shared pre-master secret */
2699                 field_size = EC_GROUP_get_degree(group);
2700                 if (field_size <= 0)
2701                         {
2702                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2703                                ERR_R_ECDH_LIB);
2704                         goto err;
2705                         }
2706                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2707                 if (i <= 0)
2708                         {
2709                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2710                             ERR_R_ECDH_LIB);
2711                         goto err;
2712                         }
2713
2714                 EVP_PKEY_free(clnt_pub_pkey);
2715                 EC_POINT_free(clnt_ecpoint);
2716                 EC_KEY_free(srvr_ecdh);
2717                 BN_CTX_free(bn_ctx);
2718                 EC_KEY_free(s->s3->tmp.ecdh);
2719                 s->s3->tmp.ecdh = NULL;
2720
2721                 /* Compute the master secret */
2722                 s->session->master_key_length = s->method->ssl3_enc-> \
2723                     generate_master_secret(s, s->session->master_key, p, i);
2724
2725                 OPENSSL_cleanse(p, i);
2726                 return (ret);
2727                 }
2728         else
2729 #endif
2730 #ifndef OPENSSL_NO_PSK
2731                 if (alg_k & SSL_kPSK)
2732                         {
2733                         unsigned char *t = NULL;
2734                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2735                         unsigned int pre_ms_len = 0, psk_len = 0;
2736                         int psk_err = 1;
2737                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2738
2739                         al=SSL_AD_HANDSHAKE_FAILURE;
2740
2741                         n2s(p,i);
2742                         if (n != i+2)
2743                                 {
2744                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2745                                         SSL_R_LENGTH_MISMATCH);
2746                                 goto psk_err;
2747                                 }
2748                         if (i > PSK_MAX_IDENTITY_LEN)
2749                                 {
2750                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2751                                         SSL_R_DATA_LENGTH_TOO_LONG);
2752                                 goto psk_err;
2753                                 }
2754                         if (s->psk_server_callback == NULL)
2755                                 {
2756                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2757                                        SSL_R_PSK_NO_SERVER_CB);
2758                                 goto psk_err;
2759                                 }
2760
2761                         /* Create guaranteed NULL-terminated identity
2762                          * string for the callback */
2763                         memcpy(tmp_id, p, i);
2764                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2765                         psk_len = s->psk_server_callback(s, tmp_id,
2766                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2767                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2768
2769                         if (psk_len > PSK_MAX_PSK_LEN)
2770                                 {
2771                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2772                                         ERR_R_INTERNAL_ERROR);
2773                                 goto psk_err;
2774                                 }
2775                         else if (psk_len == 0)
2776                                 {
2777                                 /* PSK related to the given identity not found */
2778                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2779                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2780                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2781                                 goto psk_err;
2782                                 }
2783
2784                         /* create PSK pre_master_secret */
2785                         pre_ms_len=2+psk_len+2+psk_len;
2786                         t = psk_or_pre_ms;
2787                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2788                         s2n(psk_len, t);
2789                         memset(t, 0, psk_len);
2790                         t+=psk_len;
2791                         s2n(psk_len, t);
2792
2793                         if (s->session->psk_identity != NULL)
2794                                 OPENSSL_free(s->session->psk_identity);
2795                         s->session->psk_identity = BUF_strdup((char *)p);
2796                         if (s->session->psk_identity == NULL)
2797                                 {
2798                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2799                                         ERR_R_MALLOC_FAILURE);
2800                                 goto psk_err;
2801                                 }
2802
2803                         if (s->session->psk_identity_hint != NULL)
2804                                 OPENSSL_free(s->session->psk_identity_hint);
2805                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2806                         if (s->ctx->psk_identity_hint != NULL &&
2807                                 s->session->psk_identity_hint == NULL)
2808                                 {
2809                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2810                                         ERR_R_MALLOC_FAILURE);
2811                                 goto psk_err;
2812                                 }
2813
2814                         s->session->master_key_length=
2815                                 s->method->ssl3_enc->generate_master_secret(s,
2816                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2817                         psk_err = 0;
2818                 psk_err:
2819                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2820                         if (psk_err != 0)
2821                                 goto f_err;
2822                         }
2823                 else
2824 #endif
2825 #ifndef OPENSSL_NO_SRP
2826                 if (alg_k & SSL_kSRP)
2827                         {
2828                         int param_len;
2829
2830                         n2s(p,i);
2831                         param_len=i+2;
2832                         if (param_len > n)
2833                                 {
2834                                 al=SSL_AD_DECODE_ERROR;
2835                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2836                                 goto f_err;
2837                                 }
2838                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2839                                 {
2840                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2841                                 goto err;
2842                                 }
2843                         if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0
2844                                 || BN_is_zero(s->srp_ctx.A))
2845                                 {
2846                                 al=SSL_AD_ILLEGAL_PARAMETER;
2847                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
2848                                 goto f_err;
2849                                 }
2850                         if (s->session->srp_username != NULL)
2851                                 OPENSSL_free(s->session->srp_username);
2852                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2853                         if (s->session->srp_username == NULL)
2854                                 {
2855                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2856                                         ERR_R_MALLOC_FAILURE);
2857                                 goto err;
2858                                 }
2859
2860                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2861                                 {
2862                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2863                                 goto err;
2864                                 }
2865
2866                         p+=i;
2867                         }
2868                 else
2869 #endif  /* OPENSSL_NO_SRP */
2870                 if (alg_k & SSL_kGOST)
2871                         {
2872                         int ret = 0;
2873                         EVP_PKEY_CTX *pkey_ctx;
2874                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2875                         unsigned char premaster_secret[32], *start;
2876                         size_t outlen=32, inlen;
2877                         unsigned long alg_a;
2878                         int Ttag, Tclass;
2879                         long Tlen;
2880
2881                         /* Get our certificate private key*/
2882                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2883                         if (alg_a & SSL_aGOST94)
2884                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2885                         else if (alg_a & SSL_aGOST01)
2886                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2887
2888                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2889                         EVP_PKEY_decrypt_init(pkey_ctx);
2890                         /* If client certificate is present and is of the same type, maybe
2891                          * use it for key exchange.  Don't mind errors from
2892                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2893                          * a client certificate for authorization only. */
2894                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2895                         if (client_pub_pkey)
2896                                 {
2897                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2898                                         ERR_clear_error();
2899                                 }
2900                         /* Decrypt session key */
2901                         if (ASN1_get_object((const unsigned char **)&p, &Tlen, &Ttag, &Tclass, n) != V_ASN1_CONSTRUCTED ||
2902                                 Ttag != V_ASN1_SEQUENCE ||
2903                                 Tclass != V_ASN1_UNIVERSAL)
2904                                 {
2905                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2906                                 goto gerr;
2907                                 }
2908                         start = p;
2909                         inlen = Tlen;
2910                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
2911
2912                                 {
2913                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2914                                 goto gerr;
2915                                 }
2916                         /* Generate master secret */
2917                         s->session->master_key_length=
2918                                 s->method->ssl3_enc->generate_master_secret(s,
2919                                         s->session->master_key,premaster_secret,32);
2920                         /* Check if pubkey from client certificate was used */
2921                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2922                                 ret = 2;
2923                         else
2924                                 ret = 1;
2925                 gerr:
2926                         EVP_PKEY_free(client_pub_pkey);
2927                         EVP_PKEY_CTX_free(pkey_ctx);
2928                         if (ret)
2929                                 return ret;
2930                         else
2931                                 goto err;
2932                         }
2933                 else
2934                 {
2935                 al=SSL_AD_HANDSHAKE_FAILURE;
2936                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2937                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2938                 goto f_err;
2939                 }
2940
2941         return(1);
2942 f_err:
2943         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2944 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
2945 err:
2946 #endif
2947 #ifndef OPENSSL_NO_ECDH
2948         EVP_PKEY_free(clnt_pub_pkey);
2949         EC_POINT_free(clnt_ecpoint);
2950         if (srvr_ecdh != NULL)
2951                 EC_KEY_free(srvr_ecdh);
2952         BN_CTX_free(bn_ctx);
2953 #endif
2954         return(-1);
2955         }
2956
2957 int ssl3_get_cert_verify(SSL *s)
2958         {
2959         EVP_PKEY *pkey=NULL;
2960         unsigned char *p;
2961         int al,ok,ret=0;
2962         long n;
2963         int type=0,i,j;
2964         X509 *peer;
2965         const EVP_MD *md = NULL;
2966         EVP_MD_CTX mctx;
2967         EVP_MD_CTX_init(&mctx);
2968
2969         n=s->method->ssl_get_message(s,
2970                 SSL3_ST_SR_CERT_VRFY_A,
2971                 SSL3_ST_SR_CERT_VRFY_B,
2972                 -1,
2973                 SSL3_RT_MAX_PLAIN_LENGTH,
2974                 &ok);
2975
2976         if (!ok) return((int)n);
2977
2978         if (s->session->peer != NULL)
2979                 {
2980                 peer=s->session->peer;
2981                 pkey=X509_get_pubkey(peer);
2982                 type=X509_certificate_type(peer,pkey);
2983                 }
2984         else
2985                 {
2986                 peer=NULL;
2987                 pkey=NULL;
2988                 }
2989
2990         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2991                 {
2992                 s->s3->tmp.reuse_message=1;
2993                 if ((peer != NULL) && (type & EVP_PKT_SIGN))
2994                         {
2995                         al=SSL_AD_UNEXPECTED_MESSAGE;
2996                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2997                         goto f_err;
2998                         }
2999                 ret=1;
3000                 goto end;
3001                 }
3002
3003         if (peer == NULL)
3004                 {
3005                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
3006                 al=SSL_AD_UNEXPECTED_MESSAGE;
3007                 goto f_err;
3008                 }
3009
3010         if (!(type & EVP_PKT_SIGN))
3011                 {
3012                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
3013                 al=SSL_AD_ILLEGAL_PARAMETER;
3014                 goto f_err;
3015                 }
3016
3017         if (s->s3->change_cipher_spec)
3018                 {
3019                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
3020                 al=SSL_AD_UNEXPECTED_MESSAGE;
3021                 goto f_err;
3022                 }
3023
3024         /* we now have a signature that we need to verify */
3025         p=(unsigned char *)s->init_msg;
3026         /* Check for broken implementations of GOST ciphersuites */
3027         /* If key is GOST and n is exactly 64, it is bare
3028          * signature without length field */
3029         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
3030                 pkey->type == NID_id_GostR3410_2001) )
3031                 {
3032                 i=64;
3033                 }
3034         else
3035                 {
3036                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
3037                         {
3038                         int sigalg = tls12_get_sigid(pkey);
3039                         /* Should never happen */
3040                         if (sigalg == -1)
3041                                 {
3042                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3043                                 al=SSL_AD_INTERNAL_ERROR;
3044                                 goto f_err;
3045                                 }
3046                         /* Check key type is consistent with signature */
3047                         if (sigalg != (int)p[1])
3048                                 {
3049                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_TYPE);
3050                                 al=SSL_AD_DECODE_ERROR;
3051                                 goto f_err;
3052                                 }
3053                         md = tls12_get_hash(p[0]);
3054                         if (md == NULL)
3055                                 {
3056                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_UNKNOWN_DIGEST);
3057                                 al=SSL_AD_DECODE_ERROR;
3058                                 goto f_err;
3059                                 }
3060 #ifdef SSL_DEBUG
3061 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3062 #endif
3063                         p += 2;
3064                         n -= 2;
3065                         }
3066                 n2s(p,i);
3067                 n-=2;
3068                 if (i > n)
3069                         {
3070                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3071                         al=SSL_AD_DECODE_ERROR;
3072                         goto f_err;
3073                         }
3074         }
3075         j=EVP_PKEY_size(pkey);
3076         if ((i > j) || (n > j) || (n <= 0))
3077                 {
3078                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3079                 al=SSL_AD_DECODE_ERROR;
3080                 goto f_err;
3081                 }
3082
3083         if (TLS1_get_version(s) >= TLS1_2_VERSION)
3084                 {
3085                 long hdatalen = 0;
3086                 void *hdata;
3087                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3088                 if (hdatalen <= 0)
3089                         {
3090                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3091                         al=SSL_AD_INTERNAL_ERROR;
3092                         goto f_err;
3093                         }
3094 #ifdef SSL_DEBUG
3095                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3096                                                         EVP_MD_name(md));
3097 #endif
3098                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3099                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3100                         {
3101                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3102                         al=SSL_AD_INTERNAL_ERROR;
3103                         goto f_err;
3104                         }
3105
3106                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3107                         {
3108                         al=SSL_AD_DECRYPT_ERROR;
3109                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3110                         goto f_err;
3111                         }
3112                 }
3113         else
3114 #ifndef OPENSSL_NO_RSA
3115         if (pkey->type == EVP_PKEY_RSA)
3116                 {
3117                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3118                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
3119                                                         pkey->pkey.rsa);
3120                 if (i < 0)
3121                         {
3122                         al=SSL_AD_DECRYPT_ERROR;
3123                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3124                         goto f_err;
3125                         }
3126                 if (i == 0)
3127                         {
3128                         al=SSL_AD_DECRYPT_ERROR;
3129                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3130                         goto f_err;
3131                         }
3132                 }
3133         else
3134 #endif
3135 #ifndef OPENSSL_NO_DSA
3136                 if (pkey->type == EVP_PKEY_DSA)
3137                 {
3138                 j=DSA_verify(pkey->save_type,
3139                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3140                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3141                 if (j <= 0)
3142                         {
3143                         /* bad signature */
3144                         al=SSL_AD_DECRYPT_ERROR;
3145                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3146                         goto f_err;
3147                         }
3148                 }
3149         else
3150 #endif
3151 #ifndef OPENSSL_NO_ECDSA
3152                 if (pkey->type == EVP_PKEY_EC)
3153                 {
3154                 j=ECDSA_verify(pkey->save_type,
3155                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3156                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3157                 if (j <= 0)
3158                         {
3159                         /* bad signature */
3160                         al=SSL_AD_DECRYPT_ERROR;
3161                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3162                             SSL_R_BAD_ECDSA_SIGNATURE);
3163                         goto f_err;
3164                         }
3165                 }
3166         else
3167 #endif
3168         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3169                 {   unsigned char signature[64];
3170                         int idx;
3171                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3172                         EVP_PKEY_verify_init(pctx);
3173                         if (i!=64) {
3174                                 fprintf(stderr,"GOST signature length is %d",i);
3175                         }
3176                         for (idx=0;idx<64;idx++) {
3177                                 signature[63-idx]=p[idx];
3178                         }
3179                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3180                         EVP_PKEY_CTX_free(pctx);
3181                         if (j<=0)
3182                                 {
3183                                 al=SSL_AD_DECRYPT_ERROR;
3184                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3185                                         SSL_R_BAD_ECDSA_SIGNATURE);
3186                                 goto f_err;
3187                                 }
3188                 }
3189         else
3190                 {
3191                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3192                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3193                 goto f_err;
3194                 }
3195
3196
3197         ret=1;
3198         if (0)
3199                 {
3200 f_err:
3201                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3202                 }
3203 end:
3204         if (s->s3->handshake_buffer)
3205                 {
3206                 BIO_free(s->s3->handshake_buffer);
3207                 s->s3->handshake_buffer = NULL;
3208                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3209                 }
3210         EVP_MD_CTX_cleanup(&mctx);
3211         EVP_PKEY_free(pkey);
3212         return(ret);
3213         }
3214
3215 int ssl3_get_client_certificate(SSL *s)
3216         {
3217         int i,ok,al,ret= -1;
3218         X509 *x=NULL;
3219         unsigned long l,nc,llen,n;
3220         const unsigned char *p,*q;
3221         unsigned char *d;
3222         STACK_OF(X509) *sk=NULL;
3223
3224         n=s->method->ssl_get_message(s,
3225                 SSL3_ST_SR_CERT_A,
3226                 SSL3_ST_SR_CERT_B,
3227                 -1,
3228                 s->max_cert_list,
3229                 &ok);
3230
3231         if (!ok) return((int)n);
3232
3233         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3234                 {
3235                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3236                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3237                         {
3238                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3239                         al=SSL_AD_HANDSHAKE_FAILURE;
3240                         goto f_err;
3241                         }
3242                 /* If tls asked for a client cert, the client must return a 0 list */
3243                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3244                         {
3245                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3246                         al=SSL_AD_UNEXPECTED_MESSAGE;
3247                         goto f_err;
3248                         }
3249                 s->s3->tmp.reuse_message=1;
3250                 return(1);
3251                 }
3252
3253         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3254                 {
3255                 al=SSL_AD_UNEXPECTED_MESSAGE;
3256                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3257                 goto f_err;
3258                 }
3259         p=d=(unsigned char *)s->init_msg;
3260
3261         if ((sk=sk_X509_new_null()) == NULL)
3262                 {
3263                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3264                 goto err;
3265                 }
3266
3267         n2l3(p,llen);
3268         if (llen+3 != n)
3269                 {
3270                 al=SSL_AD_DECODE_ERROR;
3271                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3272                 goto f_err;
3273                 }
3274         for (nc=0; nc<llen; )
3275                 {
3276                 n2l3(p,l);
3277                 if ((l+nc+3) > llen)
3278                         {
3279                         al=SSL_AD_DECODE_ERROR;
3280                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3281                         goto f_err;
3282                         }
3283
3284                 q=p;
3285                 x=d2i_X509(NULL,&p,l);
3286                 if (x == NULL)
3287                         {
3288                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3289                         goto err;
3290                         }
3291                 if (p != (q+l))
3292                         {
3293                         al=SSL_AD_DECODE_ERROR;
3294                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3295                         goto f_err;
3296                         }
3297                 if (!sk_X509_push(sk,x))
3298                         {
3299                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3300                         goto err;
3301                         }
3302                 x=NULL;
3303                 nc+=l+3;
3304                 }
3305
3306         if (sk_X509_num(sk) <= 0)
3307                 {
3308                 /* TLS does not mind 0 certs returned */
3309                 if (s->version == SSL3_VERSION)
3310                         {
3311                         al=SSL_AD_HANDSHAKE_FAILURE;
3312                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3313                         goto f_err;
3314                         }
3315                 /* Fail for TLS only if we required a certificate */
3316                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3317                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3318                         {
3319                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3320                         al=SSL_AD_HANDSHAKE_FAILURE;
3321                         goto f_err;
3322                         }
3323                 /* No client certificate so digest cached records */
3324                 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s))
3325                         {
3326                         al=SSL_AD_INTERNAL_ERROR;
3327                         goto f_err;
3328                         }
3329                 }
3330         else
3331                 {
3332                 i=ssl_verify_cert_chain(s,sk);
3333                 if (i <= 0)
3334                         {
3335                         al=ssl_verify_alarm_type(s->verify_result);
3336                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
3337                         goto f_err;
3338                         }
3339                 }
3340
3341         if (s->session->peer != NULL) /* This should not be needed */
3342                 X509_free(s->session->peer);
3343         s->session->peer=sk_X509_shift(sk);
3344         s->session->verify_result = s->verify_result;
3345
3346         /* With the current implementation, sess_cert will always be NULL
3347          * when we arrive here. */
3348         if (s->session->sess_cert == NULL)
3349                 {
3350                 s->session->sess_cert = ssl_sess_cert_new();
3351                 if (s->session->sess_cert == NULL)
3352                         {
3353                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3354                         goto err;
3355                         }
3356                 }
3357         if (s->session->sess_cert->cert_chain != NULL)
3358                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3359         s->session->sess_cert->cert_chain=sk;
3360         /* Inconsistency alert: cert_chain does *not* include the
3361          * peer's own certificate, while we do include it in s3_clnt.c */
3362
3363         sk=NULL;
3364
3365         ret=1;
3366         if (0)
3367                 {
3368 f_err:
3369                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3370                 }
3371 err:
3372         if (x != NULL) X509_free(x);
3373         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3374         return(ret);
3375         }
3376
3377 int ssl3_send_server_certificate(SSL *s)
3378         {
3379         unsigned long l;
3380         X509 *x;
3381
3382         if (s->state == SSL3_ST_SW_CERT_A)
3383                 {
3384                 x=ssl_get_server_send_cert(s);
3385                 if (x == NULL)
3386                         {
3387                         /* VRS: allow null cert if auth == KRB5 */
3388                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3389                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3390                                 {
3391                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3392                                 return(0);
3393                                 }
3394                         }
3395
3396                 l=ssl3_output_cert_chain(s,x);
3397                 s->state=SSL3_ST_SW_CERT_B;
3398                 s->init_num=(int)l;
3399                 s->init_off=0;
3400                 }
3401
3402         /* SSL3_ST_SW_CERT_B */
3403         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3404         }
3405
3406 #ifndef OPENSSL_NO_TLSEXT
3407 /* send a new session ticket (not necessarily for a new session) */
3408 int ssl3_send_newsession_ticket(SSL *s)
3409         {
3410         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3411                 {
3412                 unsigned char *p, *senc, *macstart;
3413                 const unsigned char *const_p;
3414                 int len, slen_full, slen;
3415                 SSL_SESSION *sess;
3416                 unsigned int hlen;
3417                 EVP_CIPHER_CTX ctx;
3418                 HMAC_CTX hctx;
3419                 SSL_CTX *tctx = s->initial_ctx;
3420                 unsigned char iv[EVP_MAX_IV_LENGTH];
3421                 unsigned char key_name[16];
3422
3423                 /* get session encoding length */
3424                 slen_full = i2d_SSL_SESSION(s->session, NULL);
3425                 /* Some length values are 16 bits, so forget it if session is
3426                  * too long
3427                  */
3428                 if (slen_full > 0xFF00)
3429                         return -1;
3430                 senc = OPENSSL_malloc(slen_full);
3431                 if (!senc)
3432                         return -1;
3433                 p = senc;
3434                 i2d_SSL_SESSION(s->session, &p);
3435
3436                 /* create a fresh copy (not shared with other threads) to clean up */
3437                 const_p = senc;
3438                 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3439                 if (sess == NULL)
3440                         {
3441                         OPENSSL_free(senc);
3442                         return -1;
3443                         }
3444                 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
3445
3446                 slen = i2d_SSL_SESSION(sess, NULL);
3447                 if (slen > slen_full) /* shouldn't ever happen */
3448                         {
3449                         OPENSSL_free(senc);
3450                         return -1;
3451                         }
3452                 p = senc;
3453                 i2d_SSL_SESSION(sess, &p);
3454                 SSL_SESSION_free(sess);
3455
3456                 /* Grow buffer if need be: the length calculation is as
3457                  * follows 1 (size of message name) + 3 (message length
3458                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
3459                  * 16 (key name) + max_iv_len (iv length) +
3460                  * session_length + max_enc_block_size (max encrypted session
3461                  * length) + max_md_size (HMAC).
3462                  */
3463                 if (!BUF_MEM_grow(s->init_buf,
3464                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
3465                         EVP_MAX_MD_SIZE + slen))
3466                         return -1;
3467
3468                 p=(unsigned char *)s->init_buf->data;
3469                 /* do the header */
3470                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
3471                 /* Skip message length for now */
3472                 p += 3;
3473                 EVP_CIPHER_CTX_init(&ctx);
3474                 HMAC_CTX_init(&hctx);
3475                 /* Initialize HMAC and cipher contexts. If callback present
3476                  * it does all the work otherwise use generated values
3477                  * from parent ctx.
3478                  */
3479                 if (tctx->tlsext_ticket_key_cb)
3480                         {
3481                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3482                                                          &hctx, 1) < 0)
3483                                 {
3484                                 OPENSSL_free(senc);
3485                                 return -1;
3486                                 }
3487                         }
3488                 else
3489                         {
3490                         RAND_pseudo_bytes(iv, 16);
3491                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3492                                         tctx->tlsext_tick_aes_key, iv);
3493                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3494                                         tlsext_tick_md(), NULL);
3495                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3496                         }
3497
3498                 /* Ticket lifetime hint (advisory only):
3499                  * We leave this unspecified for resumed session (for simplicity),
3500                  * and guess that tickets for new sessions will live as long
3501                  * as their sessions. */
3502                 l2n(s->hit ? 0 : s->session->timeout, p);
3503
3504                 /* Skip ticket length for now */
3505                 p += 2;
3506                 /* Output key name */
3507                 macstart = p;
3508                 memcpy(p, key_name, 16);
3509                 p += 16;
3510                 /* output IV */
3511                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3512                 p += EVP_CIPHER_CTX_iv_length(&ctx);
3513                 /* Encrypt session data */
3514                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3515                 p += len;
3516                 EVP_EncryptFinal(&ctx, p, &len);
3517                 p += len;
3518                 EVP_CIPHER_CTX_cleanup(&ctx);
3519
3520                 HMAC_Update(&hctx, macstart, p - macstart);
3521                 HMAC_Final(&hctx, p, &hlen);
3522                 HMAC_CTX_cleanup(&hctx);
3523
3524                 p += hlen;
3525                 /* Now write out lengths: p points to end of data written */
3526                 /* Total length */
3527                 len = p - (unsigned char *)s->init_buf->data;
3528                 p=(unsigned char *)s->init_buf->data + 1;
3529                 l2n3(len - 4, p); /* Message length */
3530                 p += 4;
3531                 s2n(len - 10, p);  /* Ticket length */
3532
3533                 /* number of bytes to write */
3534                 s->init_num= len;
3535                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3536                 s->init_off=0;
3537                 OPENSSL_free(senc);
3538                 }
3539
3540         /* SSL3_ST_SW_SESSION_TICKET_B */
3541         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3542         }
3543
3544 int ssl3_send_cert_status(SSL *s)
3545         {
3546         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3547                 {
3548                 unsigned char *p;
3549                 /* Grow buffer if need be: the length calculation is as
3550                  * follows 1 (message type) + 3 (message length) +
3551                  * 1 (ocsp response type) + 3 (ocsp response length)
3552                  * + (ocsp response)
3553                  */
3554                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3555                         return -1;
3556
3557                 p=(unsigned char *)s->init_buf->data;
3558
3559                 /* do the header */
3560                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3561                 /* message length */
3562                 l2n3(s->tlsext_ocsp_resplen + 4, p);
3563                 /* status type */
3564                 *(p++)= s->tlsext_status_type;
3565                 /* length of OCSP response */
3566                 l2n3(s->tlsext_ocsp_resplen, p);
3567                 /* actual response */
3568                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3569                 /* number of bytes to write */
3570                 s->init_num = 8 + s->tlsext_ocsp_resplen;
3571                 s->state=SSL3_ST_SW_CERT_STATUS_B;
3572                 s->init_off = 0;
3573                 }
3574
3575         /* SSL3_ST_SW_CERT_STATUS_B */
3576         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3577         }
3578
3579 # ifndef OPENSSL_NO_NEXTPROTONEG
3580 /* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It
3581  * sets the next_proto member in s if found */
3582 int ssl3_get_next_proto(SSL *s)
3583         {
3584         int ok;
3585         int proto_len, padding_len;
3586         long n;
3587         const unsigned char *p;
3588
3589         /* Clients cannot send a NextProtocol message if we didn't see the
3590          * extension in their ClientHello */
3591         if (!s->s3->next_proto_neg_seen)
3592                 {
3593                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION);
3594                 return -1;
3595                 }
3596
3597         n=s->method->ssl_get_message(s,
3598                 SSL3_ST_SR_NEXT_PROTO_A,
3599                 SSL3_ST_SR_NEXT_PROTO_B,
3600                 SSL3_MT_NEXT_PROTO,
3601                 514,  /* See the payload format below */
3602                 &ok);
3603
3604         if (!ok)
3605                 return((int)n);
3606
3607         /* s->state doesn't reflect whether ChangeCipherSpec has been received
3608          * in this handshake, but s->s3->change_cipher_spec does (will be reset
3609          * by ssl3_get_finished). */
3610         if (!s->s3->change_cipher_spec)
3611                 {
3612                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS);
3613                 return -1;
3614                 }
3615
3616         if (n < 2)
3617                 return 0;  /* The body must be > 1 bytes long */
3618
3619         p=(unsigned char *)s->init_msg;
3620
3621         /* The payload looks like:
3622          *   uint8 proto_len;
3623          *   uint8 proto[proto_len];
3624          *   uint8 padding_len;
3625          *   uint8 padding[padding_len];
3626          */
3627         proto_len = p[0];
3628         if (proto_len + 2 > s->init_num)
3629                 return 0;
3630         padding_len = p[proto_len + 1];
3631         if (proto_len + padding_len + 2 != s->init_num)
3632                 return 0;
3633
3634         s->next_proto_negotiated = OPENSSL_malloc(proto_len);
3635         if (!s->next_proto_negotiated)
3636                 {
3637                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,ERR_R_MALLOC_FAILURE);
3638                 return 0;
3639                 }
3640         memcpy(s->next_proto_negotiated, p + 1, proto_len);
3641         s->next_proto_negotiated_len = proto_len;
3642
3643         return 1;
3644         }
3645 # endif
3646 #endif