ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124 /* ====================================================================
 125  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 133  * support (see RFC 4279) to OpenSSL.
 134  *
 135  * No patent licenses or other rights except those expressly stated in
 136  * the OpenSSL open source license shall be deemed granted or received
 137  * expressly, by implication, estoppel, or otherwise.
 138  *
 139  * No assurances are provided by Nokia that the Contribution does not
 140  * infringe the patent or other intellectual property rights of any third
 141  * party or that the license provides you with all the necessary rights
 142  * to make use of the Contribution.
 143  *
 144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 148  * OTHERWISE.
 149  */
 150
 151 #define REUSE_CIPHER_BUG
 152 #define NETSCAPE_HANG_BUG
 153
 154 #include <stdio.h>
 155 #include "ssl_locl.h"
 156 #include "kssl_lcl.h"
 157 #include "../crypto/constant_time_locl.h"
 158 #include <openssl/buffer.h>
 159 #include <openssl/rand.h>
 160 #include <openssl/objects.h>
 161 #include <openssl/evp.h>
 162 #include <openssl/hmac.h>
 163 #include <openssl/x509.h>
 164 #ifndef OPENSSL_NO_DH
 165 #include <openssl/dh.h>
 166 #endif
 167 #include <openssl/bn.h>
 168 #ifndef OPENSSL_NO_KRB5
 169 #include <openssl/krb5_asn.h>
 170 #endif
 171 #include <openssl/md5.h>
 172
 173 #ifndef OPENSSL_NO_SSL3_METHOD
 174 static const SSL_METHOD *ssl3_get_server_method(int ver);
 175
 176 static const SSL_METHOD *ssl3_get_server_method(int ver)
 177         {
 178         if (ver == SSL3_VERSION)
 179                 return(SSLv3_server_method());
 180         else
 181                 return(NULL);
 182         }
 183
 184 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
 185                         ssl3_accept,
 186                         ssl_undefined_function,
 187                         ssl3_get_server_method)
 188 #endif
 189
 190 #ifndef OPENSSL_NO_SRP
 191 static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
 192         {
 193         int ret = SSL_ERROR_NONE;
 194
 195         *al = SSL_AD_UNRECOGNIZED_NAME;
 196
 197         if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
 198             (s->srp_ctx.TLS_ext_srp_username_callback != NULL))
 199                 {
 200                 if(s->srp_ctx.login == NULL)
 201                         {
 202                         /* RFC 5054 says SHOULD reject,
 203                            we do so if There is no srp login name */
 204                         ret = SSL3_AL_FATAL;
 205                         *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
 206                         }
 207                 else
 208                         {
 209                         ret = SSL_srp_server_param_with_username(s,al);
 210                         }
 211                 }
 212         return ret;
 213         }
 214 #endif
 215
 216 int ssl3_accept(SSL *s)
 217         {
 218         BUF_MEM *buf;
 219         unsigned long alg_k,Time=(unsigned long)time(NULL);
 220         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 221         int ret= -1;
 222         int new_state,state,skip=0;
 223
 224         RAND_add(&Time,sizeof(Time),0);
 225         ERR_clear_error();
 226         clear_sys_error();
 227
 228         if (s->info_callback != NULL)
 229                 cb=s->info_callback;
 230         else if (s->ctx->info_callback != NULL)
 231                 cb=s->ctx->info_callback;
 232
 233         /* init things to blank */
 234         s->in_handshake++;
 235         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 236
 237         if (s->cert == NULL)
 238                 {
 239                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 240                 return(-1);
 241                 }
 242
 243 #ifndef OPENSSL_NO_HEARTBEATS
 244         /* If we're awaiting a HeartbeatResponse, pretend we
 245          * already got and don't await it anymore, because
 246          * Heartbeats don't make sense during handshakes anyway.
 247          */
 248         if (s->tlsext_hb_pending)
 249                 {
 250                 s->tlsext_hb_pending = 0;
 251                 s->tlsext_hb_seq++;
 252                 }
 253 #endif
 254
 255         for (;;)
 256                 {
 257                 state=s->state;
 258
 259                 switch (s->state)
 260                         {
 261                 case SSL_ST_RENEGOTIATE:
 262                         s->renegotiate=1;
 263                         /* s->state=SSL_ST_ACCEPT; */
 264
 265                 case SSL_ST_BEFORE:
 266                 case SSL_ST_ACCEPT:
 267                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 268                 case SSL_ST_OK|SSL_ST_ACCEPT:
 269
 270                         s->server=1;
 271                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 272
 273                         if ((s->version>>8) != 3)
 274                                 {
 275                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 276                                 return -1;
 277                                 }
 278                         s->type=SSL_ST_ACCEPT;
 279
 280                         if (s->init_buf == NULL)
 281                                 {
 282                                 if ((buf=BUF_MEM_new()) == NULL)
 283                                         {
 284                                         ret= -1;
 285                                         goto end;
 286                                         }
 287                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 288                                         {
 289                                         ret= -1;
 290                                         goto end;
 291                                         }
 292                                 s->init_buf=buf;
 293                                 }
 294
 295                         if (!ssl3_setup_buffers(s))
 296                                 {
 297                                 ret= -1;
 298                                 goto end;
 299                                 }
 300
 301                         s->init_num=0;
 302                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
 303                         s->s3->flags &= ~TLS1_FLAGS_SKIP_CERT_VERIFY;
 304
 305                         if (s->state != SSL_ST_RENEGOTIATE)
 306                                 {
 307                                 /* Ok, we now need to push on a buffering BIO so that
 308                                  * the output is sent in a way that TCP likes :-)
 309                                  */
 310                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 311
 312                                 ssl3_init_finished_mac(s);
 313                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 314                                 s->ctx->stats.sess_accept++;
 315                                 }
 316                         else if (!s->s3->send_connection_binding &&
 317                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
 318                                 {
 319                                 /* Server attempting to renegotiate with
 320                                  * client that doesn't support secure
 321                                  * renegotiation.
 322                                  */
 323                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
 324                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 325                                 ret = -1;
 326                                 goto end;
 327                                 }
 328                         else
 329                                 {
 330                                 /* s->state == SSL_ST_RENEGOTIATE,
 331                                  * we will just send a HelloRequest */
 332                                 s->ctx->stats.sess_accept_renegotiate++;
 333                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 334                                 }
 335                         break;
 336
 337                 case SSL3_ST_SW_HELLO_REQ_A:
 338                 case SSL3_ST_SW_HELLO_REQ_B:
 339
 340                         s->shutdown=0;
 341                         ret=ssl3_send_hello_request(s);
 342                         if (ret <= 0) goto end;
 343                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 344                         s->state=SSL3_ST_SW_FLUSH;
 345                         s->init_num=0;
 346
 347                         ssl3_init_finished_mac(s);
 348                         break;
 349
 350                 case SSL3_ST_SW_HELLO_REQ_C:
 351                         s->state=SSL_ST_OK;
 352                         break;
 353
 354                 case SSL3_ST_SR_CLNT_HELLO_A:
 355                 case SSL3_ST_SR_CLNT_HELLO_B:
 356                 case SSL3_ST_SR_CLNT_HELLO_C:
 357
 358                         s->shutdown=0;
 359                         ret=ssl3_get_client_hello(s);
 360                         if (ret <= 0) goto end;
 361 #ifndef OPENSSL_NO_SRP
 362                         s->state = SSL3_ST_SR_CLNT_HELLO_D;
 363                 case SSL3_ST_SR_CLNT_HELLO_D:
 364                         {
 365                         int al;
 366                         if ((ret = ssl_check_srp_ext_ClientHello(s,&al))  < 0)
 367                                         {
 368                                         /* callback indicates firther work to be done */
 369                                         s->rwstate=SSL_X509_LOOKUP;
 370                                         goto end;
 371                                         }
 372                         if (ret != SSL_ERROR_NONE)
 373                                 {
 374                                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 375                                 /* This is not really an error but the only means to
 376                                    for a client to detect whether srp is supported. */
 377                                    if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)
 378                                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLSEXT);
 379                                 ret = SSL_TLSEXT_ERR_ALERT_FATAL;
 380                                 ret= -1;
 381                                 goto end;
 382                                 }
 383                         }
 384 #endif
 385
 386                         s->renegotiate = 2;
 387                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 388                         s->init_num=0;
 389                         break;
 390
 391                 case SSL3_ST_SW_SRVR_HELLO_A:
 392                 case SSL3_ST_SW_SRVR_HELLO_B:
 393                         ret=ssl3_send_server_hello(s);
 394                         if (ret <= 0) goto end;
 395 #ifndef OPENSSL_NO_TLSEXT
 396                         if (s->hit)
 397                                 {
 398                                 if (s->tlsext_ticket_expected)
 399                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 400                                 else
 401                                         s->state=SSL3_ST_SW_CHANGE_A;
 402                                 }
 403 #else
 404                         if (s->hit)
 405                                         s->state=SSL3_ST_SW_CHANGE_A;
 406 #endif
 407                         else
 408                                         s->state = SSL3_ST_SW_CERT_A;
 409                         s->init_num = 0;
 410                         break;
 411
 412                 case SSL3_ST_SW_CERT_A:
 413                 case SSL3_ST_SW_CERT_B:
 414                         /* Check if it is anon DH or anon ECDH, */
 415                         /* normal PSK or KRB5 or SRP */
 416                         if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aKRB5|SSL_aSRP))
 417                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 418                                 {
 419                                 ret=ssl3_send_server_certificate(s);
 420                                 if (ret <= 0) goto end;
 421 #ifndef OPENSSL_NO_TLSEXT
 422                                 if (s->tlsext_status_expected)
 423                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 424                                 else
 425                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 426                                 }
 427                         else
 428                                 {
 429                                 skip = 1;
 430                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 431                                 }
 432 #else
 433                                 }
 434                         else
 435                                 skip=1;
 436
 437                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 438 #endif
 439                         s->init_num=0;
 440                         break;
 441
 442                 case SSL3_ST_SW_KEY_EXCH_A:
 443                 case SSL3_ST_SW_KEY_EXCH_B:
 444                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 445
 446                         /* clear this, it may get reset by
 447                          * send_server_key_exchange */
 448                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 449 #ifndef OPENSSL_NO_KRB5
 450                                 && !(alg_k & SSL_kKRB5)
 451 #endif /* OPENSSL_NO_KRB5 */
 452                                 )
 453                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 454                                  * even when forbidden by protocol specs
 455                                  * (handshake may fail as clients are not required to
 456                                  * be able to handle this) */
 457                                 s->s3->tmp.use_rsa_tmp=1;
 458                         else
 459                                 s->s3->tmp.use_rsa_tmp=0;
 460
 461
 462                         /* only send if a DH key exchange, fortezza or
 463                          * RSA but we have a sign only certificate
 464                          *
 465                          * PSK: may send PSK identity hints
 466                          *
 467                          * For ECC ciphersuites, we send a serverKeyExchange
 468                          * message only if the cipher suite is either
 469                          * ECDH-anon or ECDHE. In other cases, the
 470                          * server certificate contains the server's
 471                          * public key for key exchange.
 472                          */
 473                         if (s->s3->tmp.use_rsa_tmp
 474                         /* PSK: send ServerKeyExchange if PSK identity
 475                          * hint if provided */
 476 #ifndef OPENSSL_NO_PSK
 477                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 478 #endif
 479 #ifndef OPENSSL_NO_SRP
 480                             /* SRP: send ServerKeyExchange */
 481                             || (alg_k & SSL_kSRP)
 482 #endif
 483                             || (alg_k & SSL_kEDH)
 484                             || (alg_k & SSL_kEECDH)
 485                             || ((alg_k & SSL_kRSA)
 486                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 487                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 488                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 489                                         )
 490                                     )
 491                                 )
 492                             )
 493                                 {
 494                                 ret=ssl3_send_server_key_exchange(s);
 495                                 if (ret <= 0) goto end;
 496                                 }
 497                         else
 498                                 skip=1;
 499
 500                         s->state=SSL3_ST_SW_CERT_REQ_A;
 501                         s->init_num=0;
 502                         break;
 503
 504                 case SSL3_ST_SW_CERT_REQ_A:
 505                 case SSL3_ST_SW_CERT_REQ_B:
 506                         if (/* don't request cert unless asked for it: */
 507                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 508                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 509                                  * don't request cert during re-negotiation: */
 510                                 ((s->session->peer != NULL) &&
 511                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 512                                 /* never request cert in anonymous ciphersuites
 513                                  * (see section "Certificate request" in SSL 3 drafts
 514                                  * and in RFC 2246): */
 515                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 516                                  /* ... except when the application insists on verification
 517                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 518                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 519                                  /* never request cert in Kerberos ciphersuites */
 520                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) ||
 521                                 /* don't request certificate for SRP auth */
 522                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP)
 523                                 /* With normal PSK Certificates and
 524                                  * Certificate Requests are omitted */
 525                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 526                                 {
 527                                 /* no cert request */
 528                                 skip=1;
 529                                 s->s3->tmp.cert_request=0;
 530                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 531                                 if (s->s3->handshake_buffer)
 532                                         if (!ssl3_digest_cached_records(s))
 533                                                 return -1;
 534                                 }
 535                         else
 536                                 {
 537                                 s->s3->tmp.cert_request=1;
 538                                 ret=ssl3_send_certificate_request(s);
 539                                 if (ret <= 0) goto end;
 540 #ifndef NETSCAPE_HANG_BUG
 541                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 542 #else
 543                                 s->state=SSL3_ST_SW_FLUSH;
 544                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 545 #endif
 546                                 s->init_num=0;
 547                                 }
 548                         break;
 549
 550                 case SSL3_ST_SW_SRVR_DONE_A:
 551                 case SSL3_ST_SW_SRVR_DONE_B:
 552                         ret=ssl3_send_server_done(s);
 553                         if (ret <= 0) goto end;
 554                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 555                         s->state=SSL3_ST_SW_FLUSH;
 556                         s->init_num=0;
 557                         break;
 558
 559                 case SSL3_ST_SW_FLUSH:
 560
 561                         /* This code originally checked to see if
 562                          * any data was pending using BIO_CTRL_INFO
 563                          * and then flushed. This caused problems
 564                          * as documented in PR#1939. The proposed
 565                          * fix doesn't completely resolve this issue
 566                          * as buggy implementations of BIO_CTRL_PENDING
 567                          * still exist. So instead we just flush
 568                          * unconditionally.
 569                          */
 570
 571                         s->rwstate=SSL_WRITING;
 572                         if (BIO_flush(s->wbio) <= 0)
 573                                 {
 574                                 ret= -1;
 575                                 goto end;
 576                                 }
 577                         s->rwstate=SSL_NOTHING;
 578
 579                         s->state=s->s3->tmp.next_state;
 580                         break;
 581
 582                 case SSL3_ST_SR_CERT_A:
 583                 case SSL3_ST_SR_CERT_B:
 584                         /* Check for second client hello (MS SGC) */
 585                         ret = ssl3_check_client_hello(s);
 586                         if (ret <= 0)
 587                                 goto end;
 588                         if (ret == 2)
 589                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 590                         else {
 591                                 if (s->s3->tmp.cert_request)
 592                                         {
 593                                         ret=ssl3_get_client_certificate(s);
 594                                         if (ret <= 0) goto end;
 595                                         }
 596                                 s->init_num=0;
 597                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 598                         }
 599                         break;
 600
 601                 case SSL3_ST_SR_KEY_EXCH_A:
 602                 case SSL3_ST_SR_KEY_EXCH_B:
 603                         ret=ssl3_get_client_key_exchange(s);
 604                         if (ret <= 0)
 605                                 goto end;
 606                         if (ret == 2)
 607                                 {
 608                                 /* For the ECDH ciphersuites when
 609                                  * the client sends its ECDH pub key in
 610                                  * a certificate, the CertificateVerify
 611                                  * message is not sent.
 612                                  * Also for GOST ciphersuites when
 613                                  * the client uses its key from the certificate
 614                                  * for key exchange.
 615                                  */
 616 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 617                                 s->state=SSL3_ST_SR_FINISHED_A;
 618 #else
 619                                 if (s->s3->next_proto_neg_seen)
 620                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
 621                                 else
 622                                         s->state=SSL3_ST_SR_FINISHED_A;
 623 #endif
 624                                 s->init_num = 0;
 625                                 }
 626                         else if (SSL_USE_SIGALGS(s))
 627                                 {
 628                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 629                                 s->init_num=0;
 630                                 if (!s->session->peer)
 631                                         break;
 632                                 /* For sigalgs freeze the handshake buffer
 633                                  * at this point and digest cached records.
 634                                  */
 635                                 if (!s->s3->handshake_buffer)
 636                                         {
 637                                         SSLerr(SSL_F_SSL3_ACCEPT,ERR_R_INTERNAL_ERROR);
 638                                         return -1;
 639                                         }
 640                                 s->s3->flags |= TLS1_FLAGS_KEEP_HANDSHAKE;
 641                                 if (!ssl3_digest_cached_records(s))
 642                                         return -1;
 643                                 }
 644                         else
 645                                 {
 646                                 int offset=0;
 647                                 int dgst_num;
 648
 649                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 650                                 s->init_num=0;
 651
 652                                 /* We need to get hashes here so if there is
 653                                  * a client cert, it can be verified
 654                                  * FIXME - digest processing for CertificateVerify
 655                                  * should be generalized. But it is next step
 656                                  */
 657                                 if (s->s3->handshake_buffer)
 658                                         if (!ssl3_digest_cached_records(s))
 659                                                 return -1;
 660                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
 661                                         if (s->s3->handshake_dgst[dgst_num])
 662                                                 {
 663                                                 int dgst_size;
 664
 665                                                 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]));
 666                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
 667                                                 if (dgst_size < 0)
 668                                                         {
 669                                                         ret = -1;
 670                                                         goto end;
 671                                                         }
 672                                                 offset+=dgst_size;
 673                                                 }
 674                                 }
 675                         break;
 676
 677                 case SSL3_ST_SR_CERT_VRFY_A:
 678                 case SSL3_ST_SR_CERT_VRFY_B:
 679
 680                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 681                         /* we should decide if we expected this one */
 682                         ret=ssl3_get_cert_verify(s);
 683                         if (ret <= 0) goto end;
 684
 685 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 686                         s->state=SSL3_ST_SR_FINISHED_A;
 687 #else
 688                         if (s->s3->next_proto_neg_seen)
 689                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
 690                         else
 691                                 s->state=SSL3_ST_SR_FINISHED_A;
 692 #endif
 693                         s->init_num=0;
 694                         break;
 695
 696 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 697                 case SSL3_ST_SR_NEXT_PROTO_A:
 698                 case SSL3_ST_SR_NEXT_PROTO_B:
 699                         ret=ssl3_get_next_proto(s);
 700                         if (ret <= 0) goto end;
 701                         s->init_num = 0;
 702                         s->state=SSL3_ST_SR_FINISHED_A;
 703                         break;
 704 #endif
 705
 706                 case SSL3_ST_SR_FINISHED_A:
 707                 case SSL3_ST_SR_FINISHED_B:
 708                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 709                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 710                                 SSL3_ST_SR_FINISHED_B);
 711                         if (ret <= 0) goto end;
 712                         if (s->hit)
 713                                 s->state=SSL_ST_OK;
 714 #ifndef OPENSSL_NO_TLSEXT
 715                         else if (s->tlsext_ticket_expected)
 716                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 717 #endif
 718                         else
 719                                 s->state=SSL3_ST_SW_CHANGE_A;
 720                         s->init_num=0;
 721                         break;
 722
 723 #ifndef OPENSSL_NO_TLSEXT
 724                 case SSL3_ST_SW_SESSION_TICKET_A:
 725                 case SSL3_ST_SW_SESSION_TICKET_B:
 726                         ret=ssl3_send_newsession_ticket(s);
 727                         if (ret <= 0) goto end;
 728                         s->state=SSL3_ST_SW_CHANGE_A;
 729                         s->init_num=0;
 730                         break;
 731
 732                 case SSL3_ST_SW_CERT_STATUS_A:
 733                 case SSL3_ST_SW_CERT_STATUS_B:
 734                         ret=ssl3_send_cert_status(s);
 735                         if (ret <= 0) goto end;
 736                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 737                         s->init_num=0;
 738                         break;
 739
 740 #endif
 741
 742                 case SSL3_ST_SW_CHANGE_A:
 743                 case SSL3_ST_SW_CHANGE_B:
 744
 745                         s->session->cipher=s->s3->tmp.new_cipher;
 746                         if (!s->method->ssl3_enc->setup_key_block(s))
 747                                 { ret= -1; goto end; }
 748
 749                         ret=ssl3_send_change_cipher_spec(s,
 750                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 751
 752                         if (ret <= 0) goto end;
 753                         s->state=SSL3_ST_SW_FINISHED_A;
 754                         s->init_num=0;
 755
 756                         if (!s->method->ssl3_enc->change_cipher_state(s,
 757                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 758                                 {
 759                                 ret= -1;
 760                                 goto end;
 761                                 }
 762
 763                         break;
 764
 765                 case SSL3_ST_SW_FINISHED_A:
 766                 case SSL3_ST_SW_FINISHED_B:
 767                         ret=ssl3_send_finished(s,
 768                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 769                                 s->method->ssl3_enc->server_finished_label,
 770                                 s->method->ssl3_enc->server_finished_label_len);
 771                         if (ret <= 0) goto end;
 772                         s->state=SSL3_ST_SW_FLUSH;
 773                         if (s->hit)
 774                                 {
 775 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 776                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 777 #else
 778                                 if (s->s3->next_proto_neg_seen)
 779                                         {
 780                                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 781                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
 782                                         }
 783                                 else
 784                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 785 #endif
 786                                 }
 787                         else
 788                                 s->s3->tmp.next_state=SSL_ST_OK;
 789                         s->init_num=0;
 790                         break;
 791
 792                 case SSL_ST_OK:
 793                         /* clean a few things up */
 794                         ssl3_cleanup_key_block(s);
 795
 796                         BUF_MEM_free(s->init_buf);
 797                         s->init_buf=NULL;
 798
 799                         /* remove buffering on output */
 800                         ssl_free_wbio_buffer(s);
 801
 802                         s->init_num=0;
 803
 804                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
 805                                 {
 806                                 s->renegotiate=0;
 807                                 s->new_session=0;
 808
 809                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 810
 811                                 s->ctx->stats.sess_accept_good++;
 812                                 /* s->server=1; */
 813                                 s->handshake_func=ssl3_accept;
 814
 815                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 816                                 }
 817
 818                         ret = 1;
 819                         goto end;
 820                         /* break; */
 821
 822                 default:
 823                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 824                         ret= -1;
 825                         goto end;
 826                         /* break; */
 827                         }
 828
 829                 if (!s->s3->tmp.reuse_message && !skip)
 830                         {
 831                         if (s->debug)
 832                                 {
 833                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 834                                         goto end;
 835                                 }
 836
 837
 838                         if ((cb != NULL) && (s->state != state))
 839                                 {
 840                                 new_state=s->state;
 841                                 s->state=state;
 842                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 843                                 s->state=new_state;
 844                                 }
 845                         }
 846                 skip=0;
 847                 }
 848 end:
 849         /* BIO_flush(s->wbio); */
 850
 851         s->in_handshake--;
 852         if (cb != NULL)
 853                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 854         return(ret);
 855         }
 856
 857 int ssl3_send_hello_request(SSL *s)
 858         {
 859
 860         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 861                 {
 862                 ssl_set_handshake_header(s, SSL3_MT_HELLO_REQUEST, 0);
 863                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 864                 }
 865
 866         /* SSL3_ST_SW_HELLO_REQ_B */
 867         return ssl_do_write(s);
 868         }
 869
 870 int ssl3_check_client_hello(SSL *s)
 871         {
 872         int ok;
 873         long n;
 874
 875         /* this function is called when we really expect a Certificate message,
 876          * so permit appropriate message length */
 877         n=s->method->ssl_get_message(s,
 878                 SSL3_ST_SR_CERT_A,
 879                 SSL3_ST_SR_CERT_B,
 880                 -1,
 881                 s->max_cert_list,
 882                 &ok);
 883         if (!ok) return((int)n);
 884         s->s3->tmp.reuse_message = 1;
 885         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 886                 {
 887                 /* We only allow the client to restart the handshake once per
 888                  * negotiation. */
 889                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
 890                         {
 891                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
 892                         return -1;
 893                         }
 894                 /* Throw away what we have done so far in the current handshake,
 895                  * which will now be aborted. (A full SSL_clear would be too much.) */
 896 #ifndef OPENSSL_NO_DH
 897                 if (s->s3->tmp.dh != NULL)
 898                         {
 899                         DH_free(s->s3->tmp.dh);
 900                         s->s3->tmp.dh = NULL;
 901                         }
 902 #endif
 903 #ifndef OPENSSL_NO_ECDH
 904                 if (s->s3->tmp.ecdh != NULL)
 905                         {
 906                         EC_KEY_free(s->s3->tmp.ecdh);
 907                         s->s3->tmp.ecdh = NULL;
 908                         }
 909 #endif
 910                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
 911                 return 2;
 912                 }
 913         return 1;
 914 }
 915
 916 int ssl3_get_client_hello(SSL *s)
 917         {
 918         int i,j,ok,al=SSL_AD_INTERNAL_ERROR,ret= -1;
 919         unsigned int cookie_len;
 920         long n;
 921         unsigned long id;
 922         unsigned char *p,*d;
 923         SSL_CIPHER *c;
 924 #ifndef OPENSSL_NO_COMP
 925         unsigned char *q;
 926         SSL_COMP *comp=NULL;
 927 #endif
 928         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 929
 930         if (s->state == SSL3_ST_SR_CLNT_HELLO_C && !s->first_packet)
 931                 goto retry_cert;
 932
 933         /* We do this so that we will respond with our native type.
 934          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 935          * This down switching should be handled by a different method.
 936          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 937          * TLSv1.
 938          */
 939         if (s->state == SSL3_ST_SR_CLNT_HELLO_A
 940                 )
 941                 {
 942                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 943                 }
 944         s->first_packet=1;
 945         n=s->method->ssl_get_message(s,
 946                 SSL3_ST_SR_CLNT_HELLO_B,
 947                 SSL3_ST_SR_CLNT_HELLO_C,
 948                 SSL3_MT_CLIENT_HELLO,
 949                 SSL3_RT_MAX_PLAIN_LENGTH,
 950                 &ok);
 951
 952         if (!ok) return((int)n);
 953         s->first_packet=0;
 954         d=p=(unsigned char *)s->init_msg;
 955
 956         /* use version from inside client hello, not from record header
 957          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 958         s->client_version=(((int)p[0])<<8)|(int)p[1];
 959         p+=2;
 960
 961         if (SSL_IS_DTLS(s)  ?   (s->client_version > s->version &&
 962                                  s->method->version != DTLS_ANY_VERSION)
 963                             :   (s->client_version < s->version))
 964                 {
 965                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 966                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR &&
 967                         !s->enc_write_ctx && !s->write_hash)
 968                         {
 969                         /* similar to ssl3_get_record, send alert using remote version number */
 970                         s->version = s->client_version;
 971                         }
 972                 al = SSL_AD_PROTOCOL_VERSION;
 973                 goto f_err;
 974                 }
 975
 976         /* If we require cookies and this ClientHello doesn't
 977          * contain one, just return since we do not want to
 978          * allocate any memory yet. So check cookie length...
 979          */
 980         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
 981                 {
 982                 unsigned int session_length, cookie_length;
 983
 984                 session_length = *(p + SSL3_RANDOM_SIZE);
 985                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
 986
 987                 if (cookie_length == 0)
 988                         return 1;
 989                 }
 990
 991         /* load the client random */
 992         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 993         p+=SSL3_RANDOM_SIZE;
 994
 995         /* get the session-id */
 996         j= *(p++);
 997
 998         s->hit=0;
 999         /* Versions before 0.9.7 always allow clients to resume sessions in renegotiation.
1000          * 0.9.7 and later allow this by default, but optionally ignore resumption requests
1001          * with flag SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
1002          * than a change to default behavior so that applications relying on this for security
1003          * won't even compile against older library versions).
1004          *
1005          * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to request
1006          * renegotiation but not a new session (s->new_session remains unset): for servers,
1007          * this essentially just means that the SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION
1008          * setting will be ignored.
1009          */
1010         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
1011                 {
1012                 if (!ssl_get_new_session(s,1))
1013                         goto err;
1014                 }
1015         else
1016                 {
1017                 i=ssl_get_prev_session(s, p, j, d + n);
1018                 if (i == 1)
1019                         { /* previous session */
1020                         s->hit=1;
1021                         }
1022                 else if (i == -1)
1023                         goto err;
1024                 else /* i == 0 */
1025                         {
1026                         if (!ssl_get_new_session(s,1))
1027                                 goto err;
1028                         }
1029                 }
1030
1031         p+=j;
1032
1033         if (SSL_IS_DTLS(s))
1034                 {
1035                 /* cookie stuff */
1036                 cookie_len = *(p++);
1037
1038                 /*
1039                  * The ClientHello may contain a cookie even if the
1040                  * HelloVerify message has not been sent--make sure that it
1041                  * does not cause an overflow.
1042                  */
1043                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
1044                         {
1045                         /* too much data */
1046                         al = SSL_AD_DECODE_ERROR;
1047                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
1048                         goto f_err;
1049                         }
1050
1051                 /* verify the cookie if appropriate option is set. */
1052                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
1053                         cookie_len > 0)
1054                         {
1055                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
1056
1057                         if ( s->ctx->app_verify_cookie_cb != NULL)
1058                                 {
1059                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
1060                                         cookie_len) == 0)
1061                                         {
1062                                         al=SSL_AD_HANDSHAKE_FAILURE;
1063                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1064                                                 SSL_R_COOKIE_MISMATCH);
1065                                         goto f_err;
1066                                         }
1067                                 /* else cookie verification succeeded */
1068                                 }
1069                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
1070                                                   s->d1->cookie_len) != 0) /* default verification */
1071                                 {
1072                                         al=SSL_AD_HANDSHAKE_FAILURE;
1073                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
1074                                                 SSL_R_COOKIE_MISMATCH);
1075                                         goto f_err;
1076                                 }
1077                         /* Set to -2 so if successful we return 2 */
1078                         ret = -2;
1079                         }
1080
1081                 p += cookie_len;
1082                 if (s->method->version == DTLS_ANY_VERSION)
1083                         {
1084                         /* Select version to use */
1085                         if (s->client_version <= DTLS1_2_VERSION &&
1086                                 !(s->options & SSL_OP_NO_DTLSv1_2))
1087                                 {
1088                                 s->version = DTLS1_2_VERSION;
1089                                 s->method = DTLSv1_2_server_method();
1090                                 }
1091                         else if (tls1_suiteb(s))
1092                                 {
1093                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
1094                                 s->version = s->client_version;
1095                                 al = SSL_AD_PROTOCOL_VERSION;
1096                                 goto f_err;
1097                                 }
1098                         else if (s->client_version <= DTLS1_VERSION &&
1099                                 !(s->options & SSL_OP_NO_DTLSv1))
1100                                 {
1101                                 s->version = DTLS1_VERSION;
1102                                 s->method = DTLSv1_server_method();
1103                                 }
1104                         else
1105                                 {
1106                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
1107                                 s->version = s->client_version;
1108                                 al = SSL_AD_PROTOCOL_VERSION;
1109                                 goto f_err;
1110                                 }
1111                         s->session->ssl_version = s->version;
1112                         }
1113                 }
1114
1115         n2s(p,i);
1116         if ((i == 0) && (j != 0))
1117                 {
1118                 /* we need a cipher if we are not resuming a session */
1119                 al=SSL_AD_ILLEGAL_PARAMETER;
1120                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
1121                 goto f_err;
1122                 }
1123         if ((p+i) >= (d+n))
1124                 {
1125                 /* not enough data */
1126                 al=SSL_AD_DECODE_ERROR;
1127                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1128                 goto f_err;
1129                 }
1130         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
1131                 == NULL))
1132                 {
1133                 goto err;
1134                 }
1135         p+=i;
1136
1137         /* If it is a hit, check that the cipher is in the list */
1138         if ((s->hit) && (i > 0))
1139                 {
1140                 j=0;
1141                 id=s->session->cipher->id;
1142
1143 #ifdef CIPHER_DEBUG
1144                 printf("client sent %d ciphers\n",sk_num(ciphers));
1145 #endif
1146                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1147                         {
1148                         c=sk_SSL_CIPHER_value(ciphers,i);
1149 #ifdef CIPHER_DEBUG
1150                         printf("client [%2d of %2d]:%s\n",
1151                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1152 #endif
1153                         if (c->id == id)
1154                                 {
1155                                 j=1;
1156                                 break;
1157                                 }
1158                         }
1159 /* Disabled because it can be used in a ciphersuite downgrade
1160  * attack: CVE-2010-4180.
1161  */
1162 #if 0
1163                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1164                         {
1165                         /* Special case as client bug workaround: the previously used cipher may
1166                          * not be in the current list, the client instead might be trying to
1167                          * continue using a cipher that before wasn't chosen due to server
1168                          * preferences.  We'll have to reject the connection if the cipher is not
1169                          * enabled, though. */
1170                         c = sk_SSL_CIPHER_value(ciphers, 0);
1171                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1172                                 {
1173                                 s->session->cipher = c;
1174                                 j = 1;
1175                                 }
1176                         }
1177 #endif
1178                 if (j == 0)
1179                         {
1180                         /* we need to have the cipher in the cipher
1181                          * list if we are asked to reuse it */
1182                         al=SSL_AD_ILLEGAL_PARAMETER;
1183                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1184                         goto f_err;
1185                         }
1186                 }
1187
1188         /* compression */
1189         i= *(p++);
1190         if ((p+i) > (d+n))
1191                 {
1192                 /* not enough data */
1193                 al=SSL_AD_DECODE_ERROR;
1194                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1195                 goto f_err;
1196                 }
1197 #ifndef OPENSSL_NO_COMP
1198         q=p;
1199 #endif
1200         for (j=0; j<i; j++)
1201                 {
1202                 if (p[j] == 0) break;
1203                 }
1204
1205         p+=i;
1206         if (j >= i)
1207                 {
1208                 /* no compress */
1209                 al=SSL_AD_DECODE_ERROR;
1210                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1211                 goto f_err;
1212                 }
1213
1214 #ifndef OPENSSL_NO_TLSEXT
1215         /* TLS extensions*/
1216         if (s->version >= SSL3_VERSION)
1217                 {
1218                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n))
1219                         {
1220                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1221                         goto err;
1222                         }
1223                 }
1224
1225         /* Check if we want to use external pre-shared secret for this
1226          * handshake for not reused session only. We need to generate
1227          * server_random before calling tls_session_secret_cb in order to allow
1228          * SessionTicket processing to use it in key derivation. */
1229         {
1230                 unsigned char *pos;
1231                 pos=s->s3->server_random;
1232                 if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0)
1233                         {
1234                         goto f_err;
1235                         }
1236         }
1237
1238         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1239                 {
1240                 SSL_CIPHER *pref_cipher=NULL;
1241
1242                 s->session->master_key_length=sizeof(s->session->master_key);
1243                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1244                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1245                         {
1246                         s->hit=1;
1247                         s->session->ciphers=ciphers;
1248                         s->session->verify_result=X509_V_OK;
1249
1250                         ciphers=NULL;
1251
1252                         /* check if some cipher was preferred by call back */
1253                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1254                         if (pref_cipher == NULL)
1255                                 {
1256                                 al=SSL_AD_HANDSHAKE_FAILURE;
1257                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1258                                 goto f_err;
1259                                 }
1260
1261                         s->session->cipher=pref_cipher;
1262
1263                         if (s->cipher_list)
1264                                 sk_SSL_CIPHER_free(s->cipher_list);
1265
1266                         if (s->cipher_list_by_id)
1267                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1268
1269                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1270                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1271                         }
1272                 }
1273 #endif
1274
1275         /* Worst case, we will use the NULL compression, but if we have other
1276          * options, we will now look for them.  We have i-1 compression
1277          * algorithms from the client, starting at q. */
1278         s->s3->tmp.new_compression=NULL;
1279 #ifndef OPENSSL_NO_COMP
1280         /* This only happens if we have a cache hit */
1281         if (s->session->compress_meth != 0)
1282                 {
1283                 int m, comp_id = s->session->compress_meth;
1284                 /* Perform sanity checks on resumed compression algorithm */
1285                 /* Can't disable compression */
1286                 if (s->options & SSL_OP_NO_COMPRESSION)
1287                         {
1288                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1289                         goto f_err;
1290                         }
1291                 /* Look for resumed compression method */
1292                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1293                         {
1294                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1295                         if (comp_id == comp->id)
1296                                 {
1297                                 s->s3->tmp.new_compression=comp;
1298                                 break;
1299                                 }
1300                         }
1301                 if (s->s3->tmp.new_compression == NULL)
1302                         {
1303                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1304                         goto f_err;
1305                         }
1306                 /* Look for resumed method in compression list */
1307                 for (m = 0; m < i; m++)
1308                         {
1309                         if (q[m] == comp_id)
1310                                 break;
1311                         }
1312                 if (m >= i)
1313                         {
1314                         al=SSL_AD_ILLEGAL_PARAMETER;
1315                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1316                         goto f_err;
1317                         }
1318                 }
1319         else if (s->hit)
1320                 comp = NULL;
1321         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1322                 { /* See if we have a match */
1323                 int m,nn,o,v,done=0;
1324
1325                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1326                 for (m=0; m<nn; m++)
1327                         {
1328                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1329                         v=comp->id;
1330                         for (o=0; o<i; o++)
1331                                 {
1332                                 if (v == q[o])
1333                                         {
1334                                         done=1;
1335                                         break;
1336                                         }
1337                                 }
1338                         if (done) break;
1339                         }
1340                 if (done)
1341                         s->s3->tmp.new_compression=comp;
1342                 else
1343                         comp=NULL;
1344                 }
1345 #else
1346         /* If compression is disabled we'd better not try to resume a session
1347          * using compression.
1348          */
1349         if (s->session->compress_meth != 0)
1350                 {
1351                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1352                 goto f_err;
1353                 }
1354 #endif
1355
1356         /* Given s->session->ciphers and SSL_get_ciphers, we must
1357          * pick a cipher */
1358
1359         if (!s->hit)
1360                 {
1361 #ifdef OPENSSL_NO_COMP
1362                 s->session->compress_meth=0;
1363 #else
1364                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1365 #endif
1366                 if (s->session->ciphers != NULL)
1367                         sk_SSL_CIPHER_free(s->session->ciphers);
1368                 s->session->ciphers=ciphers;
1369                 if (ciphers == NULL)
1370                         {
1371                         al=SSL_AD_ILLEGAL_PARAMETER;
1372                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1373                         goto f_err;
1374                         }
1375                 ciphers=NULL;
1376                 if (!tls1_set_server_sigalgs(s))
1377                         {
1378                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1379                         goto err;
1380                         }
1381                 /* Let cert callback update server certificates if required */
1382                 retry_cert:
1383                 if (s->cert->cert_cb)
1384                         {
1385                         int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg);
1386                         if (rv == 0)
1387                                 {
1388                                 al=SSL_AD_INTERNAL_ERROR;
1389                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CERT_CB_ERROR);
1390                                 goto f_err;
1391                                 }
1392                         if (rv < 0)
1393                                 {
1394                                 s->rwstate=SSL_X509_LOOKUP;
1395                                 return -1;
1396                                 }
1397                         s->rwstate = SSL_NOTHING;
1398                         }
1399                 c=ssl3_choose_cipher(s,s->session->ciphers,
1400                                      SSL_get_ciphers(s));
1401
1402                 if (c == NULL)
1403                         {
1404                         al=SSL_AD_HANDSHAKE_FAILURE;
1405                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1406                         goto f_err;
1407                         }
1408                 s->s3->tmp.new_cipher=c;
1409                 }
1410         else
1411                 {
1412                 /* Session-id reuse */
1413 #ifdef REUSE_CIPHER_BUG
1414                 STACK_OF(SSL_CIPHER) *sk;
1415                 SSL_CIPHER *nc=NULL;
1416                 SSL_CIPHER *ec=NULL;
1417
1418                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1419                         {
1420                         sk=s->session->ciphers;
1421                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1422                                 {
1423                                 c=sk_SSL_CIPHER_value(sk,i);
1424                                 if (c->algorithm_enc & SSL_eNULL)
1425                                         nc=c;
1426                                 if (SSL_C_IS_EXPORT(c))
1427                                         ec=c;
1428                                 }
1429                         if (nc != NULL)
1430                                 s->s3->tmp.new_cipher=nc;
1431                         else if (ec != NULL)
1432                                 s->s3->tmp.new_cipher=ec;
1433                         else
1434                                 s->s3->tmp.new_cipher=s->session->cipher;
1435                         }
1436                 else
1437 #endif
1438                 s->s3->tmp.new_cipher=s->session->cipher;
1439                 }
1440
1441         if (!SSL_USE_SIGALGS(s) || !(s->verify_mode & SSL_VERIFY_PEER))
1442                 {
1443                 if (!ssl3_digest_cached_records(s))
1444                         goto f_err;
1445                 }
1446
1447         /* we now have the following setup.
1448          * client_random
1449          * cipher_list          - our prefered list of ciphers
1450          * ciphers              - the clients prefered list of ciphers
1451          * compression          - basically ignored right now
1452          * ssl version is set   - sslv3
1453          * s->session           - The ssl session has been setup.
1454          * s->hit               - session reuse flag
1455          * s->tmp.new_cipher    - the new cipher to use.
1456          */
1457
1458         /* Handles TLS extensions that we couldn't check earlier */
1459         if (s->version >= SSL3_VERSION)
1460                 {
1461                 if (ssl_check_clienthello_tlsext_late(s) <= 0)
1462                         {
1463                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
1464                         goto err;
1465                         }
1466                 }
1467
1468         if (ret < 0) ret=-ret;
1469         if (0)
1470                 {
1471 f_err:
1472                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1473                 }
1474 err:
1475         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1476         return ret < 0 ? -1 : ret;
1477         }
1478
1479 int ssl3_send_server_hello(SSL *s)
1480         {
1481         unsigned char *buf;
1482         unsigned char *p,*d;
1483         int i,sl;
1484         int al = 0;
1485         unsigned long l;
1486
1487         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1488                 {
1489                 buf=(unsigned char *)s->init_buf->data;
1490 #ifdef OPENSSL_NO_TLSEXT
1491                 p=s->s3->server_random;
1492                 if (ssl_fill_hello_random(s, 1, p, SSL3_RANDOM_SIZE) <= 0)
1493                         return -1;
1494 #endif
1495                 /* Do the message type and length last */
1496                 d=p= ssl_handshake_start(s);
1497
1498                 *(p++)=s->version>>8;
1499                 *(p++)=s->version&0xff;
1500
1501                 /* Random stuff */
1502                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1503                 p+=SSL3_RANDOM_SIZE;
1504
1505                 /* There are several cases for the session ID to send
1506                  * back in the server hello:
1507                  * - For session reuse from the session cache,
1508                  *   we send back the old session ID.
1509                  * - If stateless session reuse (using a session ticket)
1510                  *   is successful, we send back the client's "session ID"
1511                  *   (which doesn't actually identify the session).
1512                  * - If it is a new session, we send back the new
1513                  *   session ID.
1514                  * - However, if we want the new session to be single-use,
1515                  *   we send back a 0-length session ID.
1516                  * s->hit is non-zero in either case of session reuse,
1517                  * so the following won't overwrite an ID that we're supposed
1518                  * to send back.
1519                  */
1520                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1521                         && !s->hit)
1522                         s->session->session_id_length=0;
1523
1524                 sl=s->session->session_id_length;
1525                 if (sl > (int)sizeof(s->session->session_id))
1526                         {
1527                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1528                         return -1;
1529                         }
1530                 *(p++)=sl;
1531                 memcpy(p,s->session->session_id,sl);
1532                 p+=sl;
1533
1534                 /* put the cipher */
1535                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1536                 p+=i;
1537
1538                 /* put the compression method */
1539 #ifdef OPENSSL_NO_COMP
1540                         *(p++)=0;
1541 #else
1542                 if (s->s3->tmp.new_compression == NULL)
1543                         *(p++)=0;
1544                 else
1545                         *(p++)=s->s3->tmp.new_compression->id;
1546 #endif
1547 #ifndef OPENSSL_NO_TLSEXT
1548                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1549                         {
1550                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1551                         return -1;
1552                         }
1553                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL)
1554                         {
1555                         ssl3_send_alert(s, SSL3_AL_FATAL, al);
1556                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1557                         return -1;
1558                         }
1559 #endif
1560                 /* do the header */
1561                 l=(p-d);
1562                 ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l);
1563                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1564                 }
1565
1566         /* SSL3_ST_SW_SRVR_HELLO_B */
1567         return ssl_do_write(s);
1568         }
1569
1570 int ssl3_send_server_done(SSL *s)
1571         {
1572
1573         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1574                 {
1575                 ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0);
1576                 s->state = SSL3_ST_SW_SRVR_DONE_B;
1577                 }
1578
1579         /* SSL3_ST_SW_SRVR_DONE_B */
1580         return ssl_do_write(s);
1581         }
1582
1583 int ssl3_send_server_key_exchange(SSL *s)
1584         {
1585 #ifndef OPENSSL_NO_RSA
1586         unsigned char *q;
1587         int j,num;
1588         RSA *rsa;
1589         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1590         unsigned int u;
1591 #endif
1592 #ifndef OPENSSL_NO_DH
1593         DH *dh=NULL,*dhp;
1594 #endif
1595 #ifndef OPENSSL_NO_ECDH
1596         EC_KEY *ecdh=NULL, *ecdhp;
1597         unsigned char *encodedPoint = NULL;
1598         int encodedlen = 0;
1599         int curve_id = 0;
1600         BN_CTX *bn_ctx = NULL;
1601 #endif
1602         EVP_PKEY *pkey;
1603         const EVP_MD *md = NULL;
1604         unsigned char *p,*d;
1605         int al,i;
1606         unsigned long type;
1607         int n;
1608         CERT *cert;
1609         BIGNUM *r[4];
1610         int nr[4],kn;
1611         BUF_MEM *buf;
1612         EVP_MD_CTX md_ctx;
1613
1614         EVP_MD_CTX_init(&md_ctx);
1615         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1616                 {
1617                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1618                 cert=s->cert;
1619
1620                 buf=s->init_buf;
1621
1622                 r[0]=r[1]=r[2]=r[3]=NULL;
1623                 n=0;
1624 #ifndef OPENSSL_NO_RSA
1625                 if (type & SSL_kRSA)
1626                         {
1627                         rsa=cert->rsa_tmp;
1628                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1629                                 {
1630                                 rsa=s->cert->rsa_tmp_cb(s,
1631                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1632                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1633                                 if(rsa == NULL)
1634                                 {
1635                                         al=SSL_AD_HANDSHAKE_FAILURE;
1636                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1637                                         goto f_err;
1638                                 }
1639                                 RSA_up_ref(rsa);
1640                                 cert->rsa_tmp=rsa;
1641                                 }
1642                         if (rsa == NULL)
1643                                 {
1644                                 al=SSL_AD_HANDSHAKE_FAILURE;
1645                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1646                                 goto f_err;
1647                                 }
1648                         r[0]=rsa->n;
1649                         r[1]=rsa->e;
1650                         s->s3->tmp.use_rsa_tmp=1;
1651                         }
1652                 else
1653 #endif
1654 #ifndef OPENSSL_NO_DH
1655                         if (type & SSL_kEDH)
1656                         {
1657                         dhp=cert->dh_tmp;
1658                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1659                                 dhp=s->cert->dh_tmp_cb(s,
1660                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1661                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1662                         if (dhp == NULL)
1663                                 {
1664                                 al=SSL_AD_HANDSHAKE_FAILURE;
1665                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1666                                 goto f_err;
1667                                 }
1668
1669                         if (s->s3->tmp.dh != NULL)
1670                                 {
1671                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1672                                 goto err;
1673                                 }
1674
1675                         if ((dh=DHparams_dup(dhp)) == NULL)
1676                                 {
1677                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1678                                 goto err;
1679                                 }
1680
1681                         s->s3->tmp.dh=dh;
1682                         if ((dhp->pub_key == NULL ||
1683                              dhp->priv_key == NULL ||
1684                              (s->options & SSL_OP_SINGLE_DH_USE)))
1685                                 {
1686                                 if(!DH_generate_key(dh))
1687                                     {
1688                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1689                                            ERR_R_DH_LIB);
1690                                     goto err;
1691                                     }
1692                                 }
1693                         else
1694                                 {
1695                                 dh->pub_key=BN_dup(dhp->pub_key);
1696                                 dh->priv_key=BN_dup(dhp->priv_key);
1697                                 if ((dh->pub_key == NULL) ||
1698                                         (dh->priv_key == NULL))
1699                                         {
1700                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1701                                         goto err;
1702                                         }
1703                                 }
1704                         r[0]=dh->p;
1705                         r[1]=dh->g;
1706                         r[2]=dh->pub_key;
1707                         }
1708                 else
1709 #endif
1710 #ifndef OPENSSL_NO_ECDH
1711                         if (type & SSL_kEECDH)
1712                         {
1713                         const EC_GROUP *group;
1714
1715                         ecdhp=cert->ecdh_tmp;
1716                         if (s->cert->ecdh_tmp_auto)
1717                                 {
1718                                 /* Get NID of appropriate shared curve */
1719                                 int nid = tls1_shared_curve(s, -2);
1720                                 if (nid != NID_undef)
1721                                         ecdhp = EC_KEY_new_by_curve_name(nid);
1722                                 }
1723                         else if ((ecdhp == NULL) && s->cert->ecdh_tmp_cb)
1724                                 {
1725                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1726                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1727                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1728                                 }
1729                         if (ecdhp == NULL)
1730                                 {
1731                                 al=SSL_AD_HANDSHAKE_FAILURE;
1732                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1733                                 goto f_err;
1734                                 }
1735
1736                         if (s->s3->tmp.ecdh != NULL)
1737                                 {
1738                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1739                                 goto err;
1740                                 }
1741
1742                         /* Duplicate the ECDH structure. */
1743                         if (ecdhp == NULL)
1744                                 {
1745                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1746                                 goto err;
1747                                 }
1748                         if (s->cert->ecdh_tmp_auto)
1749                                 ecdh = ecdhp;
1750                         else if ((ecdh = EC_KEY_dup(ecdhp)) == NULL)
1751                                 {
1752                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1753                                 goto err;
1754                                 }
1755
1756                         s->s3->tmp.ecdh=ecdh;
1757                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1758                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1759                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1760                                 {
1761                                 if(!EC_KEY_generate_key(ecdh))
1762                                     {
1763                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1764                                     goto err;
1765                                     }
1766                                 }
1767
1768                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1769                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1770                             (EC_KEY_get0_private_key(ecdh) == NULL))
1771                                 {
1772                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1773                                 goto err;
1774                                 }
1775
1776                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1777                             (EC_GROUP_get_degree(group) > 163))
1778                                 {
1779                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1780                                 goto err;
1781                                 }
1782
1783                         /* XXX: For now, we only support ephemeral ECDH
1784                          * keys over named (not generic) curves. For
1785                          * supported named curves, curve_id is non-zero.
1786                          */
1787                         if ((curve_id =
1788                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1789                             == 0)
1790                                 {
1791                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1792                                 goto err;
1793                                 }
1794
1795                         /* Encode the public key.
1796                          * First check the size of encoding and
1797                          * allocate memory accordingly.
1798                          */
1799                         encodedlen = EC_POINT_point2oct(group,
1800                             EC_KEY_get0_public_key(ecdh),
1801                             POINT_CONVERSION_UNCOMPRESSED,
1802                             NULL, 0, NULL);
1803
1804                         encodedPoint = (unsigned char *)
1805                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1806                         bn_ctx = BN_CTX_new();
1807                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1808                                 {
1809                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1810                                 goto err;
1811                                 }
1812
1813
1814                         encodedlen = EC_POINT_point2oct(group,
1815                             EC_KEY_get0_public_key(ecdh),
1816                             POINT_CONVERSION_UNCOMPRESSED,
1817                             encodedPoint, encodedlen, bn_ctx);
1818
1819                         if (encodedlen == 0)
1820                                 {
1821                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1822                                 goto err;
1823                                 }
1824
1825                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1826
1827                         /* XXX: For now, we only support named (not
1828                          * generic) curves in ECDH ephemeral key exchanges.
1829                          * In this situation, we need four additional bytes
1830                          * to encode the entire ServerECDHParams
1831                          * structure.
1832                          */
1833                         n = 4 + encodedlen;
1834
1835                         /* We'll generate the serverKeyExchange message
1836                          * explicitly so we can set these to NULLs
1837                          */
1838                         r[0]=NULL;
1839                         r[1]=NULL;
1840                         r[2]=NULL;
1841                         r[3]=NULL;
1842                         }
1843                 else
1844 #endif /* !OPENSSL_NO_ECDH */
1845 #ifndef OPENSSL_NO_PSK
1846                         if (type & SSL_kPSK)
1847                                 {
1848                                 /* reserve size for record length and PSK identity hint*/
1849                                 n+=2+strlen(s->ctx->psk_identity_hint);
1850                                 }
1851                         else
1852 #endif /* !OPENSSL_NO_PSK */
1853 #ifndef OPENSSL_NO_SRP
1854                 if (type & SSL_kSRP)
1855                         {
1856                         if ((s->srp_ctx.N == NULL) ||
1857                                 (s->srp_ctx.g == NULL) ||
1858                                 (s->srp_ctx.s == NULL) ||
1859                                 (s->srp_ctx.B == NULL))
1860                                 {
1861                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_SRP_PARAM);
1862                                 goto err;
1863                                 }
1864                         r[0]=s->srp_ctx.N;
1865                         r[1]=s->srp_ctx.g;
1866                         r[2]=s->srp_ctx.s;
1867                         r[3]=s->srp_ctx.B;
1868                         }
1869                 else
1870 #endif
1871                         {
1872                         al=SSL_AD_HANDSHAKE_FAILURE;
1873                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1874                         goto f_err;
1875                         }
1876                 for (i=0; i < 4 && r[i] != NULL; i++)
1877                         {
1878                         nr[i]=BN_num_bytes(r[i]);
1879 #ifndef OPENSSL_NO_SRP
1880                         if ((i == 2) && (type & SSL_kSRP))
1881                                 n+=1+nr[i];
1882                         else
1883 #endif
1884                         n+=2+nr[i];
1885                         }
1886
1887                 if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP))
1888                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1889                         {
1890                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher,&md))
1891                                 == NULL)
1892                                 {
1893                                 al=SSL_AD_DECODE_ERROR;
1894                                 goto f_err;
1895                                 }
1896                         kn=EVP_PKEY_size(pkey);
1897                         }
1898                 else
1899                         {
1900                         pkey=NULL;
1901                         kn=0;
1902                         }
1903
1904                 if (!BUF_MEM_grow_clean(buf,n+SSL_HM_HEADER_LENGTH(s)+kn))
1905                         {
1906                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1907                         goto err;
1908                         }
1909                 d = p = ssl_handshake_start(s);
1910
1911                 for (i=0; i < 4 && r[i] != NULL; i++)
1912                         {
1913 #ifndef OPENSSL_NO_SRP
1914                         if ((i == 2) && (type & SSL_kSRP))
1915                                 {
1916                                 *p = nr[i];
1917                                 p++;
1918                                 }
1919                         else
1920 #endif
1921                         s2n(nr[i],p);
1922                         BN_bn2bin(r[i],p);
1923                         p+=nr[i];
1924                         }
1925
1926 #ifndef OPENSSL_NO_ECDH
1927                 if (type & SSL_kEECDH)
1928                         {
1929                         /* XXX: For now, we only support named (not generic) curves.
1930                          * In this situation, the serverKeyExchange message has:
1931                          * [1 byte CurveType], [2 byte CurveName]
1932                          * [1 byte length of encoded point], followed by
1933                          * the actual encoded point itself
1934                          */
1935                         *p = NAMED_CURVE_TYPE;
1936                         p += 1;
1937                         *p = 0;
1938                         p += 1;
1939                         *p = curve_id;
1940                         p += 1;
1941                         *p = encodedlen;
1942                         p += 1;
1943                         memcpy((unsigned char*)p,
1944                             (unsigned char *)encodedPoint,
1945                             encodedlen);
1946                         OPENSSL_free(encodedPoint);
1947                         encodedPoint = NULL;
1948                         p += encodedlen;
1949                         }
1950 #endif
1951
1952 #ifndef OPENSSL_NO_PSK
1953                 if (type & SSL_kPSK)
1954                         {
1955                         /* copy PSK identity hint */
1956                         s2n(strlen(s->ctx->psk_identity_hint), p);
1957                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1958                         p+=strlen(s->ctx->psk_identity_hint);
1959                         }
1960 #endif
1961
1962                 /* not anonymous */
1963                 if (pkey != NULL)
1964                         {
1965                         /* n is the length of the params, they start at &(d[4])
1966                          * and p points to the space at the end. */
1967 #ifndef OPENSSL_NO_RSA
1968                         if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
1969                                 {
1970                                 q=md_buf;
1971                                 j=0;
1972                                 for (num=2; num > 0; num--)
1973                                         {
1974                                         EVP_MD_CTX_set_flags(&md_ctx,
1975                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1976                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1977                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1978                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1979                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1980                                         EVP_DigestUpdate(&md_ctx,d,n);
1981                                         EVP_DigestFinal_ex(&md_ctx,q,
1982                                                 (unsigned int *)&i);
1983                                         q+=i;
1984                                         j+=i;
1985                                         }
1986                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1987                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1988                                         {
1989                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1990                                         goto err;
1991                                         }
1992                                 s2n(u,p);
1993                                 n+=u+2;
1994                                 }
1995                         else
1996 #endif
1997                         if (md)
1998                                 {
1999                                 /* send signature algorithm */
2000                                 if (SSL_USE_SIGALGS(s))
2001                                         {
2002                                         if (!tls12_get_sigandhash(p, pkey, md))
2003                                                 {
2004                                                 /* Should never happen */
2005                                                 al=SSL_AD_INTERNAL_ERROR;
2006                                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2007                                                 goto f_err;
2008                                                 }
2009                                         p+=2;
2010                                         }
2011 #ifdef SSL_DEBUG
2012                                 fprintf(stderr, "Using hash %s\n",
2013                                                         EVP_MD_name(md));
2014 #endif
2015                                 EVP_SignInit_ex(&md_ctx, md, NULL);
2016                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2017                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2018                                 EVP_SignUpdate(&md_ctx,d,n);
2019                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
2020                                         (unsigned int *)&i,pkey))
2021                                         {
2022                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_EVP);
2023                                         goto err;
2024                                         }
2025                                 s2n(i,p);
2026                                 n+=i+2;
2027                                 if (SSL_USE_SIGALGS(s))
2028                                         n+= 2;
2029                                 }
2030                         else
2031                                 {
2032                                 /* Is this error check actually needed? */
2033                                 al=SSL_AD_HANDSHAKE_FAILURE;
2034                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
2035                                 goto f_err;
2036                                 }
2037                         }
2038
2039                 ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n);
2040                 }
2041
2042         s->state = SSL3_ST_SW_KEY_EXCH_B;
2043         EVP_MD_CTX_cleanup(&md_ctx);
2044         return ssl_do_write(s);
2045 f_err:
2046         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2047 err:
2048 #ifndef OPENSSL_NO_ECDH
2049         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2050         BN_CTX_free(bn_ctx);
2051 #endif
2052         EVP_MD_CTX_cleanup(&md_ctx);
2053         return(-1);
2054         }
2055
2056 int ssl3_send_certificate_request(SSL *s)
2057         {
2058         unsigned char *p,*d;
2059         int i,j,nl,off,n;
2060         STACK_OF(X509_NAME) *sk=NULL;
2061         X509_NAME *name;
2062         BUF_MEM *buf;
2063
2064         if (s->state == SSL3_ST_SW_CERT_REQ_A)
2065                 {
2066                 buf=s->init_buf;
2067
2068                 d=p=ssl_handshake_start(s);
2069
2070                 /* get the list of acceptable cert types */
2071                 p++;
2072                 n=ssl3_get_req_cert_type(s,p);
2073                 d[0]=n;
2074                 p+=n;
2075                 n++;
2076
2077                 if (SSL_USE_SIGALGS(s))
2078                         {
2079                         const unsigned char *psigs;
2080                         nl = tls12_get_psigalgs(s, &psigs);
2081                         s2n(nl, p);
2082                         memcpy(p, psigs, nl);
2083                         p += nl;
2084                         n += nl + 2;
2085                         }
2086
2087                 off=n;
2088                 p+=2;
2089                 n+=2;
2090
2091                 sk=SSL_get_client_CA_list(s);
2092                 nl=0;
2093                 if (sk != NULL)
2094                         {
2095                         for (i=0; i<sk_X509_NAME_num(sk); i++)
2096                                 {
2097                                 name=sk_X509_NAME_value(sk,i);
2098                                 j=i2d_X509_NAME(name,NULL);
2099                                 if (!BUF_MEM_grow_clean(buf,SSL_HM_HEADER_LENGTH(s)+n+j+2))
2100                                         {
2101                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2102                                         goto err;
2103                                         }
2104                                 p = ssl_handshake_start(s) + n;
2105                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2106                                         {
2107                                         s2n(j,p);
2108                                         i2d_X509_NAME(name,&p);
2109                                         n+=2+j;
2110                                         nl+=2+j;
2111                                         }
2112                                 else
2113                                         {
2114                                         d=p;
2115                                         i2d_X509_NAME(name,&p);
2116                                         j-=2; s2n(j,d); j+=2;
2117                                         n+=j;
2118                                         nl+=j;
2119                                         }
2120                                 }
2121                         }
2122                 /* else no CA names */
2123                 p = ssl_handshake_start(s) + off;
2124                 s2n(nl,p);
2125
2126                 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n);
2127
2128 #ifdef NETSCAPE_HANG_BUG
2129                 if (!SSL_IS_DTLS(s))
2130                         {
2131                         if (!BUF_MEM_grow_clean(buf, s->init_num + 4))
2132                                 {
2133                                 SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
2134                                 goto err;
2135                                 }
2136                         p=(unsigned char *)s->init_buf->data + s->init_num;
2137                         /* do the header */
2138                         *(p++)=SSL3_MT_SERVER_DONE;
2139                         *(p++)=0;
2140                         *(p++)=0;
2141                         *(p++)=0;
2142                         s->init_num += 4;
2143                         }
2144 #endif
2145
2146                 s->state = SSL3_ST_SW_CERT_REQ_B;
2147                 }
2148
2149         /* SSL3_ST_SW_CERT_REQ_B */
2150         return ssl_do_write(s);
2151 err:
2152         return(-1);
2153         }
2154
2155 int ssl3_get_client_key_exchange(SSL *s)
2156         {
2157         int i,al,ok;
2158         long n;
2159         unsigned long alg_k;
2160         unsigned char *p;
2161 #ifndef OPENSSL_NO_RSA
2162         RSA *rsa=NULL;
2163         EVP_PKEY *pkey=NULL;
2164 #endif
2165 #ifndef OPENSSL_NO_DH
2166         BIGNUM *pub=NULL;
2167         DH *dh_srvr, *dh_clnt = NULL;
2168 #endif
2169 #ifndef OPENSSL_NO_KRB5
2170         KSSL_ERR kssl_err;
2171 #endif /* OPENSSL_NO_KRB5 */
2172
2173 #ifndef OPENSSL_NO_ECDH
2174         EC_KEY *srvr_ecdh = NULL;
2175         EVP_PKEY *clnt_pub_pkey = NULL;
2176         EC_POINT *clnt_ecpoint = NULL;
2177         BN_CTX *bn_ctx = NULL;
2178 #endif
2179
2180         n=s->method->ssl_get_message(s,
2181                 SSL3_ST_SR_KEY_EXCH_A,
2182                 SSL3_ST_SR_KEY_EXCH_B,
2183                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2184                 2048, /* ??? */
2185                 &ok);
2186
2187         if (!ok) return((int)n);
2188         p=(unsigned char *)s->init_msg;
2189
2190         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2191
2192 #ifndef OPENSSL_NO_RSA
2193         if (alg_k & SSL_kRSA)
2194                 {
2195                 unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
2196                 int decrypt_len;
2197                 unsigned char decrypt_good, version_good;
2198
2199                 /* FIX THIS UP EAY EAY EAY EAY */
2200                 if (s->s3->tmp.use_rsa_tmp)
2201                         {
2202                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2203                                 rsa=s->cert->rsa_tmp;
2204                         /* Don't do a callback because rsa_tmp should
2205                          * be sent already */
2206                         if (rsa == NULL)
2207                                 {
2208                                 al=SSL_AD_HANDSHAKE_FAILURE;
2209                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2210                                 goto f_err;
2211
2212                                 }
2213                         }
2214                 else
2215                         {
2216                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2217                         if (    (pkey == NULL) ||
2218                                 (pkey->type != EVP_PKEY_RSA) ||
2219                                 (pkey->pkey.rsa == NULL))
2220                                 {
2221                                 al=SSL_AD_HANDSHAKE_FAILURE;
2222                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2223                                 goto f_err;
2224                                 }
2225                         rsa=pkey->pkey.rsa;
2226                         }
2227
2228                 /* TLS and [incidentally] DTLS{0xFEFF} */
2229                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2230                         {
2231                         n2s(p,i);
2232                         if (n != i+2)
2233                                 {
2234                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2235                                         {
2236                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2237                                         goto err;
2238                                         }
2239                                 else
2240                                         p-=2;
2241                                 }
2242                         else
2243                                 n=i;
2244                         }
2245
2246                 /* We must not leak whether a decryption failure occurs because
2247                  * of Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see
2248                  * RFC 2246, section 7.4.7.1). The code follows that advice of
2249                  * the TLS RFC and generates a random premaster secret for the
2250                  * case that the decrypt fails. See
2251                  * https://tools.ietf.org/html/rfc5246#section-7.4.7.1 */
2252
2253                 /* should be RAND_bytes, but we cannot work around a failure. */
2254                 if (RAND_pseudo_bytes(rand_premaster_secret,
2255                                       sizeof(rand_premaster_secret)) <= 0)
2256                         goto err;
2257                 decrypt_len = RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2258                 ERR_clear_error();
2259
2260                 /* decrypt_len should be SSL_MAX_MASTER_KEY_LENGTH.
2261                  * decrypt_good will be 0xff if so and zero otherwise. */
2262                 decrypt_good = constant_time_eq_int_8(decrypt_len, SSL_MAX_MASTER_KEY_LENGTH);
2263
2264                 /* If the version in the decrypted pre-master secret is correct
2265                  * then version_good will be 0xff, otherwise it'll be zero.
2266                  * The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2267                  * (http://eprint.iacr.org/2003/052/) exploits the version
2268                  * number check as a "bad version oracle". Thus version checks
2269                  * are done in constant time and are treated like any other
2270                  * decryption error. */
2271                 version_good = constant_time_eq_8(p[0], (unsigned)(s->client_version>>8));
2272                 version_good &= constant_time_eq_8(p[1], (unsigned)(s->client_version&0xff));
2273
2274                 /* The premaster secret must contain the same version number as
2275                  * the ClientHello to detect version rollback attacks
2276                  * (strangely, the protocol does not offer such protection for
2277                  * DH ciphersuites). However, buggy clients exist that send the
2278                  * negotiated protocol version instead if the server does not
2279                  * support the requested protocol version. If
2280                  * SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2281                 if (s->options & SSL_OP_TLS_ROLLBACK_BUG)
2282                         {
2283                         unsigned char workaround_good;
2284                         workaround_good = constant_time_eq_8(p[0], (unsigned)(s->version>>8));
2285                         workaround_good &= constant_time_eq_8(p[1], (unsigned)(s->version&0xff));
2286                         version_good |= workaround_good;
2287                         }
2288
2289                 /* Both decryption and version must be good for decrypt_good
2290                  * to remain non-zero (0xff). */
2291                 decrypt_good &= version_good;
2292
2293                 /* Now copy rand_premaster_secret over p using
2294                  * decrypt_good_mask. */
2295                 for (i = 0; i < (int) sizeof(rand_premaster_secret); i++)
2296                         {
2297                         p[i] = constant_time_select_8(decrypt_good, p[i],
2298                                                       rand_premaster_secret[i]);
2299                         }
2300
2301                 s->session->master_key_length=
2302                         s->method->ssl3_enc->generate_master_secret(s,
2303                                 s->session->master_key,
2304                                 p,i);
2305                 OPENSSL_cleanse(p,i);
2306                 }
2307         else
2308 #endif
2309 #ifndef OPENSSL_NO_DH
2310                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2311                 {
2312                 int idx = -1;
2313                 EVP_PKEY *skey = NULL;
2314                 if (n)
2315                         n2s(p,i);
2316                 else
2317                         i = 0;
2318                 if (n && n != i+2)
2319                         {
2320                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2321                                 {
2322                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2323                                 goto err;
2324                                 }
2325                         else
2326                                 {
2327                                 p-=2;
2328                                 i=(int)n;
2329                                 }
2330                         }
2331                 if (alg_k & SSL_kDHr)
2332                         idx = SSL_PKEY_DH_RSA;
2333                 else if (alg_k & SSL_kDHd)
2334                         idx = SSL_PKEY_DH_DSA;
2335                 if (idx >= 0)
2336                         {
2337                         skey = s->cert->pkeys[idx].privatekey;
2338                         if ((skey == NULL) ||
2339                                 (skey->type != EVP_PKEY_DH) ||
2340                                 (skey->pkey.dh == NULL))
2341                                 {
2342                                 al=SSL_AD_HANDSHAKE_FAILURE;
2343                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2344                                 goto f_err;
2345                                 }
2346                         dh_srvr = skey->pkey.dh;
2347                         }
2348                 else if (s->s3->tmp.dh == NULL)
2349                         {
2350                         al=SSL_AD_HANDSHAKE_FAILURE;
2351                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2352                         goto f_err;
2353                         }
2354                 else
2355                         dh_srvr=s->s3->tmp.dh;
2356
2357                 if (n == 0L)
2358                         {
2359                         /* Get pubkey from cert */
2360                         EVP_PKEY *clkey=X509_get_pubkey(s->session->peer);
2361                         if (clkey)
2362                                 {
2363                                 if (EVP_PKEY_cmp_parameters(clkey, skey) == 1)
2364                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2365                                 }
2366                         if (dh_clnt == NULL)
2367                                 {
2368                                 al=SSL_AD_HANDSHAKE_FAILURE;
2369                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2370                                 goto f_err;
2371                                 }
2372                         EVP_PKEY_free(clkey);
2373                         pub = dh_clnt->pub_key;
2374                         }
2375                 else
2376                         pub=BN_bin2bn(p,i,NULL);
2377                 if (pub == NULL)
2378                         {
2379                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2380                         goto err;
2381                         }
2382
2383                 i=DH_compute_key(p,pub,dh_srvr);
2384
2385                 if (i <= 0)
2386                         {
2387                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2388                         BN_clear_free(pub);
2389                         goto err;
2390                         }
2391
2392                 DH_free(s->s3->tmp.dh);
2393                 s->s3->tmp.dh=NULL;
2394                 if (dh_clnt)
2395                         DH_free(dh_clnt);
2396                 else
2397                         BN_clear_free(pub);
2398                 pub=NULL;
2399                 s->session->master_key_length=
2400                         s->method->ssl3_enc->generate_master_secret(s,
2401                                 s->session->master_key,p,i);
2402                 OPENSSL_cleanse(p,i);
2403                 if (dh_clnt)
2404                         return 2;
2405                 }
2406         else
2407 #endif
2408 #ifndef OPENSSL_NO_KRB5
2409         if (alg_k & SSL_kKRB5)
2410                 {
2411                 krb5_error_code         krb5rc;
2412                 krb5_data               enc_ticket;
2413                 krb5_data               authenticator;
2414                 krb5_data               enc_pms;
2415                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2416                 EVP_CIPHER_CTX          ciph_ctx;
2417                 const EVP_CIPHER        *enc = NULL;
2418                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2419                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2420                                                + EVP_MAX_BLOCK_LENGTH];
2421                 int                  padl, outl;
2422                 krb5_timestamp          authtime = 0;
2423                 krb5_ticket_times       ttimes;
2424
2425                 EVP_CIPHER_CTX_init(&ciph_ctx);
2426
2427                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2428
2429                 n2s(p,i);
2430                 enc_ticket.length = i;
2431
2432                 if (n < (long)(enc_ticket.length + 6))
2433                         {
2434                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2435                                 SSL_R_DATA_LENGTH_TOO_LONG);
2436                         goto err;
2437                         }
2438
2439                 enc_ticket.data = (char *)p;
2440                 p+=enc_ticket.length;
2441
2442                 n2s(p,i);
2443                 authenticator.length = i;
2444
2445                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2446                         {
2447                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2448                                 SSL_R_DATA_LENGTH_TOO_LONG);
2449                         goto err;
2450                         }
2451
2452                 authenticator.data = (char *)p;
2453                 p+=authenticator.length;
2454
2455                 n2s(p,i);
2456                 enc_pms.length = i;
2457                 enc_pms.data = (char *)p;
2458                 p+=enc_pms.length;
2459
2460                 /* Note that the length is checked again below,
2461                 ** after decryption
2462                 */
2463                 if(enc_pms.length > sizeof pms)
2464                         {
2465                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2466                                SSL_R_DATA_LENGTH_TOO_LONG);
2467                         goto err;
2468                         }
2469
2470                 if (n != (long)(enc_ticket.length + authenticator.length +
2471                                                 enc_pms.length + 6))
2472                         {
2473                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2474                                 SSL_R_DATA_LENGTH_TOO_LONG);
2475                         goto err;
2476                         }
2477
2478                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2479                                         &kssl_err)) != 0)
2480                         {
2481 #ifdef KSSL_DEBUG
2482                         printf("kssl_sget_tkt rtn %d [%d]\n",
2483                                 krb5rc, kssl_err.reason);
2484                         if (kssl_err.text)
2485                                 printf("kssl_err text= %s\n", kssl_err.text);
2486 #endif  /* KSSL_DEBUG */
2487                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2488                                 kssl_err.reason);
2489                         goto err;
2490                         }
2491
2492                 /*  Note: no authenticator is not considered an error,
2493                 **  but will return authtime == 0.
2494                 */
2495                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2496                                         &authtime, &kssl_err)) != 0)
2497                         {
2498 #ifdef KSSL_DEBUG
2499                         printf("kssl_check_authent rtn %d [%d]\n",
2500                                 krb5rc, kssl_err.reason);
2501                         if (kssl_err.text)
2502                                 printf("kssl_err text= %s\n", kssl_err.text);
2503 #endif  /* KSSL_DEBUG */
2504                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2505                                 kssl_err.reason);
2506                         goto err;
2507                         }
2508
2509                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2510                         {
2511                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2512                         goto err;
2513                         }
2514
2515 #ifdef KSSL_DEBUG
2516                 kssl_ctx_show(kssl_ctx);
2517 #endif  /* KSSL_DEBUG */
2518
2519                 enc = kssl_map_enc(kssl_ctx->enctype);
2520                 if (enc == NULL)
2521                     goto err;
2522
2523                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2524
2525                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2526                         {
2527                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2528                                 SSL_R_DECRYPTION_FAILED);
2529                         goto err;
2530                         }
2531                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2532                                         (unsigned char *)enc_pms.data, enc_pms.length))
2533                         {
2534                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2535                                 SSL_R_DECRYPTION_FAILED);
2536                         goto err;
2537                         }
2538                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2539                         {
2540                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2541                                 SSL_R_DATA_LENGTH_TOO_LONG);
2542                         goto err;
2543                         }
2544                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2545                         {
2546                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2547                                 SSL_R_DECRYPTION_FAILED);
2548                         goto err;
2549                         }
2550                 outl += padl;
2551                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2552                         {
2553                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2554                                 SSL_R_DATA_LENGTH_TOO_LONG);
2555                         goto err;
2556                         }
2557                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2558                     {
2559                     /* The premaster secret must contain the same version number as the
2560                      * ClientHello to detect version rollback attacks (strangely, the
2561                      * protocol does not offer such protection for DH ciphersuites).
2562                      * However, buggy clients exist that send random bytes instead of
2563                      * the protocol version.
2564                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2565                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2566                      */
2567                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2568                         {
2569                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2570                                SSL_AD_DECODE_ERROR);
2571                         goto err;
2572                         }
2573                     }
2574
2575                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2576
2577                 s->session->master_key_length=
2578                         s->method->ssl3_enc->generate_master_secret(s,
2579                                 s->session->master_key, pms, outl);
2580
2581                 if (kssl_ctx->client_princ)
2582                         {
2583                         size_t len = strlen(kssl_ctx->client_princ);
2584                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2585                                 {
2586                                 s->session->krb5_client_princ_len = len;
2587                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2588                                 }
2589                         }
2590
2591
2592                 /*  Was doing kssl_ctx_free() here,
2593                 **  but it caused problems for apache.
2594                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2595                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2596                 */
2597                 }
2598         else
2599 #endif  /* OPENSSL_NO_KRB5 */
2600
2601 #ifndef OPENSSL_NO_ECDH
2602                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2603                 {
2604                 int ret = 1;
2605                 int field_size = 0;
2606                 const EC_KEY   *tkey;
2607                 const EC_GROUP *group;
2608                 const BIGNUM *priv_key;
2609
2610                 /* initialize structures for server's ECDH key pair */
2611                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2612                         {
2613                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2614                             ERR_R_MALLOC_FAILURE);
2615                         goto err;
2616                         }
2617
2618                 /* Let's get server private key and group information */
2619                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2620                         {
2621                         /* use the certificate */
2622                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2623                         }
2624                 else
2625                         {
2626                         /* use the ephermeral values we saved when
2627                          * generating the ServerKeyExchange msg.
2628                          */
2629                         tkey = s->s3->tmp.ecdh;
2630                         }
2631
2632                 group    = EC_KEY_get0_group(tkey);
2633                 priv_key = EC_KEY_get0_private_key(tkey);
2634
2635                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2636                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2637                         {
2638                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2639                                ERR_R_EC_LIB);
2640                         goto err;
2641                         }
2642
2643                 /* Let's get client's public key */
2644                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2645                         {
2646                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2647                             ERR_R_MALLOC_FAILURE);
2648                         goto err;
2649                         }
2650
2651                 if (n == 0L)
2652                         {
2653                         /* Client Publickey was in Client Certificate */
2654
2655                          if (alg_k & SSL_kEECDH)
2656                                  {
2657                                  al=SSL_AD_HANDSHAKE_FAILURE;
2658                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2659                                  goto f_err;
2660                                  }
2661                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2662                             == NULL) ||
2663                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2664                                 {
2665                                 /* XXX: For now, we do not support client
2666                                  * authentication using ECDH certificates
2667                                  * so this branch (n == 0L) of the code is
2668                                  * never executed. When that support is
2669                                  * added, we ought to ensure the key
2670                                  * received in the certificate is
2671                                  * authorized for key agreement.
2672                                  * ECDH_compute_key implicitly checks that
2673                                  * the two ECDH shares are for the same
2674                                  * group.
2675                                  */
2676                                 al=SSL_AD_HANDSHAKE_FAILURE;
2677                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2678                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2679                                 goto f_err;
2680                                 }
2681
2682                         if (EC_POINT_copy(clnt_ecpoint,
2683                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2684                                 {
2685                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2686                                         ERR_R_EC_LIB);
2687                                 goto err;
2688                                 }
2689                         ret = 2; /* Skip certificate verify processing */
2690                         }
2691                 else
2692                         {
2693                         /* Get client's public key from encoded point
2694                          * in the ClientKeyExchange message.
2695                          */
2696                         if ((bn_ctx = BN_CTX_new()) == NULL)
2697                                 {
2698                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2699                                     ERR_R_MALLOC_FAILURE);
2700                                 goto err;
2701                                 }
2702
2703                         /* Get encoded point length */
2704                         i = *p;
2705                         p += 1;
2706                         if (n != 1 + i)
2707                                 {
2708                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2709                                     ERR_R_EC_LIB);
2710                                 goto err;
2711                                 }
2712                         if (EC_POINT_oct2point(group,
2713                             clnt_ecpoint, p, i, bn_ctx) == 0)
2714                                 {
2715                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2716                                     ERR_R_EC_LIB);
2717                                 goto err;
2718                                 }
2719                         /* p is pointing to somewhere in the buffer
2720                          * currently, so set it to the start
2721                          */
2722                         p=(unsigned char *)s->init_buf->data;
2723                         }
2724
2725                 /* Compute the shared pre-master secret */
2726                 field_size = EC_GROUP_get_degree(group);
2727                 if (field_size <= 0)
2728                         {
2729                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2730                                ERR_R_ECDH_LIB);
2731                         goto err;
2732                         }
2733                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2734                 if (i <= 0)
2735                         {
2736                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2737                             ERR_R_ECDH_LIB);
2738                         goto err;
2739                         }
2740
2741                 EVP_PKEY_free(clnt_pub_pkey);
2742                 EC_POINT_free(clnt_ecpoint);
2743                 EC_KEY_free(srvr_ecdh);
2744                 BN_CTX_free(bn_ctx);
2745                 EC_KEY_free(s->s3->tmp.ecdh);
2746                 s->s3->tmp.ecdh = NULL;
2747
2748                 /* Compute the master secret */
2749                 s->session->master_key_length = s->method->ssl3_enc-> \
2750                     generate_master_secret(s, s->session->master_key, p, i);
2751
2752                 OPENSSL_cleanse(p, i);
2753                 return (ret);
2754                 }
2755         else
2756 #endif
2757 #ifndef OPENSSL_NO_PSK
2758                 if (alg_k & SSL_kPSK)
2759                         {
2760                         unsigned char *t = NULL;
2761                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2762                         unsigned int pre_ms_len = 0, psk_len = 0;
2763                         int psk_err = 1;
2764                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2765
2766                         al=SSL_AD_HANDSHAKE_FAILURE;
2767
2768                         n2s(p,i);
2769                         if (n != i+2)
2770                                 {
2771                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2772                                         SSL_R_LENGTH_MISMATCH);
2773                                 goto psk_err;
2774                                 }
2775                         if (i > PSK_MAX_IDENTITY_LEN)
2776                                 {
2777                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2778                                         SSL_R_DATA_LENGTH_TOO_LONG);
2779                                 goto psk_err;
2780                                 }
2781                         if (s->psk_server_callback == NULL)
2782                                 {
2783                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2784                                        SSL_R_PSK_NO_SERVER_CB);
2785                                 goto psk_err;
2786                                 }
2787
2788                         /* Create guaranteed NULL-terminated identity
2789                          * string for the callback */
2790                         memcpy(tmp_id, p, i);
2791                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2792                         psk_len = s->psk_server_callback(s, tmp_id,
2793                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2794                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2795
2796                         if (psk_len > PSK_MAX_PSK_LEN)
2797                                 {
2798                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2799                                         ERR_R_INTERNAL_ERROR);
2800                                 goto psk_err;
2801                                 }
2802                         else if (psk_len == 0)
2803                                 {
2804                                 /* PSK related to the given identity not found */
2805                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2806                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2807                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2808                                 goto psk_err;
2809                                 }
2810
2811                         /* create PSK pre_master_secret */
2812                         pre_ms_len=2+psk_len+2+psk_len;
2813                         t = psk_or_pre_ms;
2814                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2815                         s2n(psk_len, t);
2816                         memset(t, 0, psk_len);
2817                         t+=psk_len;
2818                         s2n(psk_len, t);
2819
2820                         if (s->session->psk_identity != NULL)
2821                                 OPENSSL_free(s->session->psk_identity);
2822                         s->session->psk_identity = BUF_strdup((char *)p);
2823                         if (s->session->psk_identity == NULL)
2824                                 {
2825                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2826                                         ERR_R_MALLOC_FAILURE);
2827                                 goto psk_err;
2828                                 }
2829
2830                         if (s->session->psk_identity_hint != NULL)
2831                                 OPENSSL_free(s->session->psk_identity_hint);
2832                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2833                         if (s->ctx->psk_identity_hint != NULL &&
2834                                 s->session->psk_identity_hint == NULL)
2835                                 {
2836                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2837                                         ERR_R_MALLOC_FAILURE);
2838                                 goto psk_err;
2839                                 }
2840
2841                         s->session->master_key_length=
2842                                 s->method->ssl3_enc->generate_master_secret(s,
2843                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2844                         psk_err = 0;
2845                 psk_err:
2846                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2847                         if (psk_err != 0)
2848                                 goto f_err;
2849                         }
2850                 else
2851 #endif
2852 #ifndef OPENSSL_NO_SRP
2853                 if (alg_k & SSL_kSRP)
2854                         {
2855                         int param_len;
2856
2857                         n2s(p,i);
2858                         param_len=i+2;
2859                         if (param_len > n)
2860                                 {
2861                                 al=SSL_AD_DECODE_ERROR;
2862                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_A_LENGTH);
2863                                 goto f_err;
2864                                 }
2865                         if (!(s->srp_ctx.A=BN_bin2bn(p,i,NULL)))
2866                                 {
2867                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_BN_LIB);
2868                                 goto err;
2869                                 }
2870                         if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0
2871                                 || BN_is_zero(s->srp_ctx.A))
2872                                 {
2873                                 al=SSL_AD_ILLEGAL_PARAMETER;
2874                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
2875                                 goto f_err;
2876                                 }
2877                         if (s->session->srp_username != NULL)
2878                                 OPENSSL_free(s->session->srp_username);
2879                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2880                         if (s->session->srp_username == NULL)
2881                                 {
2882                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2883                                         ERR_R_MALLOC_FAILURE);
2884                                 goto err;
2885                                 }
2886
2887                         if ((s->session->master_key_length = SRP_generate_server_master_secret(s,s->session->master_key))<0)
2888                                 {
2889                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2890                                 goto err;
2891                                 }
2892
2893                         p+=i;
2894                         }
2895                 else
2896 #endif  /* OPENSSL_NO_SRP */
2897                 if (alg_k & SSL_kGOST)
2898                         {
2899                         int ret = 0;
2900                         EVP_PKEY_CTX *pkey_ctx;
2901                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2902                         unsigned char premaster_secret[32], *start;
2903                         size_t outlen=32, inlen;
2904                         unsigned long alg_a;
2905                         int Ttag, Tclass;
2906                         long Tlen;
2907
2908                         /* Get our certificate private key*/
2909                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2910                         if (alg_a & SSL_aGOST94)
2911                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2912                         else if (alg_a & SSL_aGOST01)
2913                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2914
2915                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2916                         EVP_PKEY_decrypt_init(pkey_ctx);
2917                         /* If client certificate is present and is of the same type, maybe
2918                          * use it for key exchange.  Don't mind errors from
2919                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2920                          * a client certificate for authorization only. */
2921                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2922                         if (client_pub_pkey)
2923                                 {
2924                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2925                                         ERR_clear_error();
2926                                 }
2927                         /* Decrypt session key */
2928                         if (ASN1_get_object((const unsigned char **)&p, &Tlen, &Ttag, &Tclass, n) != V_ASN1_CONSTRUCTED ||
2929                                 Ttag != V_ASN1_SEQUENCE ||
2930                                 Tclass != V_ASN1_UNIVERSAL)
2931                                 {
2932                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2933                                 goto gerr;
2934                                 }
2935                         start = p;
2936                         inlen = Tlen;
2937                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
2938
2939                                 {
2940                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2941                                 goto gerr;
2942                                 }
2943                         /* Generate master secret */
2944                         s->session->master_key_length=
2945                                 s->method->ssl3_enc->generate_master_secret(s,
2946                                         s->session->master_key,premaster_secret,32);
2947                         /* Check if pubkey from client certificate was used */
2948                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2949                                 ret = 2;
2950                         else
2951                                 ret = 1;
2952                 gerr:
2953                         EVP_PKEY_free(client_pub_pkey);
2954                         EVP_PKEY_CTX_free(pkey_ctx);
2955                         if (ret)
2956                                 return ret;
2957                         else
2958                                 goto err;
2959                         }
2960                 else
2961                 {
2962                 al=SSL_AD_HANDSHAKE_FAILURE;
2963                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2964                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2965                 goto f_err;
2966                 }
2967
2968         return(1);
2969 f_err:
2970         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2971 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH) || defined(OPENSSL_NO_SRP)
2972 err:
2973 #endif
2974 #ifndef OPENSSL_NO_ECDH
2975         EVP_PKEY_free(clnt_pub_pkey);
2976         EC_POINT_free(clnt_ecpoint);
2977         if (srvr_ecdh != NULL)
2978                 EC_KEY_free(srvr_ecdh);
2979         BN_CTX_free(bn_ctx);
2980 #endif
2981         return(-1);
2982         }
2983
2984 int ssl3_get_cert_verify(SSL *s)
2985         {
2986         EVP_PKEY *pkey=NULL;
2987         unsigned char *p;
2988         int al,ok,ret=0;
2989         long n;
2990         int type=0,i,j;
2991         X509 *peer;
2992         const EVP_MD *md = NULL;
2993         EVP_MD_CTX mctx;
2994         EVP_MD_CTX_init(&mctx);
2995
2996         n=s->method->ssl_get_message(s,
2997                 SSL3_ST_SR_CERT_VRFY_A,
2998                 SSL3_ST_SR_CERT_VRFY_B,
2999                 -1,
3000                 SSL3_RT_MAX_PLAIN_LENGTH,
3001                 &ok);
3002
3003         if (!ok) return((int)n);
3004
3005         if (s->session->peer != NULL)
3006                 {
3007                 peer=s->session->peer;
3008                 pkey=X509_get_pubkey(peer);
3009                 type=X509_certificate_type(peer,pkey);
3010                 }
3011         else
3012                 {
3013                 peer=NULL;
3014                 pkey=NULL;
3015                 }
3016
3017         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
3018                 {
3019                 s->s3->tmp.reuse_message=1;
3020                 if ((peer != NULL) && (type & EVP_PKT_SIGN))
3021                         {
3022                         al=SSL_AD_UNEXPECTED_MESSAGE;
3023                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
3024                         goto f_err;
3025                         }
3026                 ret=1;
3027                 goto end;
3028                 }
3029
3030         if (peer == NULL)
3031                 {
3032                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
3033                 al=SSL_AD_UNEXPECTED_MESSAGE;
3034                 goto f_err;
3035                 }
3036
3037         if (!(type & EVP_PKT_SIGN))
3038                 {
3039                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
3040                 al=SSL_AD_ILLEGAL_PARAMETER;
3041                 goto f_err;
3042                 }
3043
3044         if (s->s3->change_cipher_spec)
3045                 {
3046                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
3047                 al=SSL_AD_UNEXPECTED_MESSAGE;
3048                 goto f_err;
3049                 }
3050
3051         /* we now have a signature that we need to verify */
3052         p=(unsigned char *)s->init_msg;
3053         /* Check for broken implementations of GOST ciphersuites */
3054         /* If key is GOST and n is exactly 64, it is bare
3055          * signature without length field */
3056         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
3057                 pkey->type == NID_id_GostR3410_2001) )
3058                 {
3059                 i=64;
3060                 }
3061         else
3062                 {
3063                 if (SSL_USE_SIGALGS(s))
3064                         {
3065                         int rv = tls12_check_peer_sigalg(&md, s, p, pkey);
3066                         if (rv == -1)
3067                                 {
3068                                 al = SSL_AD_INTERNAL_ERROR;
3069                                 goto f_err;
3070                                 }
3071                         else if (rv == 0)
3072                                 {
3073                                 al = SSL_AD_DECODE_ERROR;
3074                                 goto f_err;
3075                                 }
3076 #ifdef SSL_DEBUG
3077 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
3078 #endif
3079                         p += 2;
3080                         n -= 2;
3081                         }
3082                 n2s(p,i);
3083                 n-=2;
3084                 if (i > n)
3085                         {
3086                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
3087                         al=SSL_AD_DECODE_ERROR;
3088                         goto f_err;
3089                         }
3090         }
3091         j=EVP_PKEY_size(pkey);
3092         if ((i > j) || (n > j) || (n <= 0))
3093                 {
3094                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
3095                 al=SSL_AD_DECODE_ERROR;
3096                 goto f_err;
3097                 }
3098
3099         if (SSL_USE_SIGALGS(s))
3100                 {
3101                 long hdatalen = 0;
3102                 void *hdata;
3103                 hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
3104                 if (hdatalen <= 0)
3105                         {
3106                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
3107                         al=SSL_AD_INTERNAL_ERROR;
3108                         goto f_err;
3109                         }
3110 #ifdef SSL_DEBUG
3111                 fprintf(stderr, "Using TLS 1.2 with client verify alg %s\n",
3112                                                         EVP_MD_name(md));
3113 #endif
3114                 if (!EVP_VerifyInit_ex(&mctx, md, NULL)
3115                         || !EVP_VerifyUpdate(&mctx, hdata, hdatalen))
3116                         {
3117                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY, ERR_R_EVP_LIB);
3118                         al=SSL_AD_INTERNAL_ERROR;
3119                         goto f_err;
3120                         }
3121
3122                 if (EVP_VerifyFinal(&mctx, p , i, pkey) <= 0)
3123                         {
3124                         al=SSL_AD_DECRYPT_ERROR;
3125                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_SIGNATURE);
3126                         goto f_err;
3127                         }
3128                 }
3129         else
3130 #ifndef OPENSSL_NO_RSA
3131         if (pkey->type == EVP_PKEY_RSA)
3132                 {
3133                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
3134                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
3135                                                         pkey->pkey.rsa);
3136                 if (i < 0)
3137                         {
3138                         al=SSL_AD_DECRYPT_ERROR;
3139                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
3140                         goto f_err;
3141                         }
3142                 if (i == 0)
3143                         {
3144                         al=SSL_AD_DECRYPT_ERROR;
3145                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
3146                         goto f_err;
3147                         }
3148                 }
3149         else
3150 #endif
3151 #ifndef OPENSSL_NO_DSA
3152                 if (pkey->type == EVP_PKEY_DSA)
3153                 {
3154                 j=DSA_verify(pkey->save_type,
3155                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3156                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
3157                 if (j <= 0)
3158                         {
3159                         /* bad signature */
3160                         al=SSL_AD_DECRYPT_ERROR;
3161                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
3162                         goto f_err;
3163                         }
3164                 }
3165         else
3166 #endif
3167 #ifndef OPENSSL_NO_ECDSA
3168                 if (pkey->type == EVP_PKEY_EC)
3169                 {
3170                 j=ECDSA_verify(pkey->save_type,
3171                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
3172                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
3173                 if (j <= 0)
3174                         {
3175                         /* bad signature */
3176                         al=SSL_AD_DECRYPT_ERROR;
3177                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3178                             SSL_R_BAD_ECDSA_SIGNATURE);
3179                         goto f_err;
3180                         }
3181                 }
3182         else
3183 #endif
3184         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3185                 {   unsigned char signature[64];
3186                         int idx;
3187                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
3188                         EVP_PKEY_verify_init(pctx);
3189                         if (i!=64) {
3190                                 fprintf(stderr,"GOST signature length is %d",i);
3191                         }
3192                         for (idx=0;idx<64;idx++) {
3193                                 signature[63-idx]=p[idx];
3194                         }
3195                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
3196                         EVP_PKEY_CTX_free(pctx);
3197                         if (j<=0)
3198                                 {
3199                                 al=SSL_AD_DECRYPT_ERROR;
3200                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
3201                                         SSL_R_BAD_ECDSA_SIGNATURE);
3202                                 goto f_err;
3203                                 }
3204                 }
3205         else
3206                 {
3207                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
3208                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
3209                 goto f_err;
3210                 }
3211
3212
3213         ret=1;
3214         if (0)
3215                 {
3216 f_err:
3217                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3218                 }
3219 end:
3220         if (s->s3->handshake_buffer)
3221                 {
3222                 BIO_free(s->s3->handshake_buffer);
3223                 s->s3->handshake_buffer = NULL;
3224                 s->s3->flags &= ~TLS1_FLAGS_KEEP_HANDSHAKE;
3225                 }
3226         EVP_MD_CTX_cleanup(&mctx);
3227         EVP_PKEY_free(pkey);
3228         return(ret);
3229         }
3230
3231 int ssl3_get_client_certificate(SSL *s)
3232         {
3233         int i,ok,al,ret= -1;
3234         X509 *x=NULL;
3235         unsigned long l,nc,llen,n;
3236         const unsigned char *p,*q;
3237         unsigned char *d;
3238         STACK_OF(X509) *sk=NULL;
3239
3240         n=s->method->ssl_get_message(s,
3241                 SSL3_ST_SR_CERT_A,
3242                 SSL3_ST_SR_CERT_B,
3243                 -1,
3244                 s->max_cert_list,
3245                 &ok);
3246
3247         if (!ok) return((int)n);
3248
3249         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
3250                 {
3251                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
3252                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3253                         {
3254                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3255                         al=SSL_AD_HANDSHAKE_FAILURE;
3256                         goto f_err;
3257                         }
3258                 /* If tls asked for a client cert, the client must return a 0 list */
3259                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
3260                         {
3261                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
3262                         al=SSL_AD_UNEXPECTED_MESSAGE;
3263                         goto f_err;
3264                         }
3265                 s->s3->tmp.reuse_message=1;
3266                 return(1);
3267                 }
3268
3269         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
3270                 {
3271                 al=SSL_AD_UNEXPECTED_MESSAGE;
3272                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
3273                 goto f_err;
3274                 }
3275         p=d=(unsigned char *)s->init_msg;
3276
3277         if ((sk=sk_X509_new_null()) == NULL)
3278                 {
3279                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3280                 goto err;
3281                 }
3282
3283         n2l3(p,llen);
3284         if (llen+3 != n)
3285                 {
3286                 al=SSL_AD_DECODE_ERROR;
3287                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
3288                 goto f_err;
3289                 }
3290         for (nc=0; nc<llen; )
3291                 {
3292                 n2l3(p,l);
3293                 if ((l+nc+3) > llen)
3294                         {
3295                         al=SSL_AD_DECODE_ERROR;
3296                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3297                         goto f_err;
3298                         }
3299
3300                 q=p;
3301                 x=d2i_X509(NULL,&p,l);
3302                 if (x == NULL)
3303                         {
3304                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
3305                         goto err;
3306                         }
3307                 if (p != (q+l))
3308                         {
3309                         al=SSL_AD_DECODE_ERROR;
3310                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
3311                         goto f_err;
3312                         }
3313                 if (!sk_X509_push(sk,x))
3314                         {
3315                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
3316                         goto err;
3317                         }
3318                 x=NULL;
3319                 nc+=l+3;
3320                 }
3321
3322         if (sk_X509_num(sk) <= 0)
3323                 {
3324                 /* TLS does not mind 0 certs returned */
3325                 if (s->version == SSL3_VERSION)
3326                         {
3327                         al=SSL_AD_HANDSHAKE_FAILURE;
3328                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3329                         goto f_err;
3330                         }
3331                 /* Fail for TLS only if we required a certificate */
3332                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3333                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3334                         {
3335                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3336                         al=SSL_AD_HANDSHAKE_FAILURE;
3337                         goto f_err;
3338                         }
3339                 /* No client certificate so digest cached records */
3340                 if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s))
3341                         {
3342                         al=SSL_AD_INTERNAL_ERROR;
3343                         goto f_err;
3344                         }
3345                 }
3346         else
3347                 {
3348                 i=ssl_verify_cert_chain(s,sk);
3349                 if (i <= 0)
3350                         {
3351                         al=ssl_verify_alarm_type(s->verify_result);
3352                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
3353                         goto f_err;
3354                         }
3355                 }
3356
3357         if (s->session->peer != NULL) /* This should not be needed */
3358                 X509_free(s->session->peer);
3359         s->session->peer=sk_X509_shift(sk);
3360         s->session->verify_result = s->verify_result;
3361
3362         /* With the current implementation, sess_cert will always be NULL
3363          * when we arrive here. */
3364         if (s->session->sess_cert == NULL)
3365                 {
3366                 s->session->sess_cert = ssl_sess_cert_new();
3367                 if (s->session->sess_cert == NULL)
3368                         {
3369                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3370                         goto err;
3371                         }
3372                 }
3373         if (s->session->sess_cert->cert_chain != NULL)
3374                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3375         s->session->sess_cert->cert_chain=sk;
3376         /* Inconsistency alert: cert_chain does *not* include the
3377          * peer's own certificate, while we do include it in s3_clnt.c */
3378
3379         sk=NULL;
3380
3381         ret=1;
3382         if (0)
3383                 {
3384 f_err:
3385                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3386                 }
3387 err:
3388         if (x != NULL) X509_free(x);
3389         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3390         return(ret);
3391         }
3392
3393 int ssl3_send_server_certificate(SSL *s)
3394         {
3395         CERT_PKEY *cpk;
3396
3397         if (s->state == SSL3_ST_SW_CERT_A)
3398                 {
3399                 cpk=ssl_get_server_send_pkey(s);
3400                 if (cpk == NULL)
3401                         {
3402                         /* VRS: allow null cert if auth == KRB5 */
3403                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3404                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3405                                 {
3406                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3407                                 return(0);
3408                                 }
3409                         }
3410
3411                 ssl3_output_cert_chain(s,cpk);
3412                 s->state=SSL3_ST_SW_CERT_B;
3413                 }
3414
3415         /* SSL3_ST_SW_CERT_B */
3416         return ssl_do_write(s);
3417         }
3418
3419 #ifndef OPENSSL_NO_TLSEXT
3420 /* send a new session ticket (not necessarily for a new session) */
3421 int ssl3_send_newsession_ticket(SSL *s)
3422         {
3423         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3424                 {
3425                 unsigned char *p, *senc, *macstart;
3426                 const unsigned char *const_p;
3427                 int len, slen_full, slen;
3428                 SSL_SESSION *sess;
3429                 unsigned int hlen;
3430                 EVP_CIPHER_CTX ctx;
3431                 HMAC_CTX hctx;
3432                 SSL_CTX *tctx = s->initial_ctx;
3433                 unsigned char iv[EVP_MAX_IV_LENGTH];
3434                 unsigned char key_name[16];
3435
3436                 /* get session encoding length */
3437                 slen_full = i2d_SSL_SESSION(s->session, NULL);
3438                 /* Some length values are 16 bits, so forget it if session is
3439                  * too long
3440                  */
3441                 if (slen_full > 0xFF00)
3442                         return -1;
3443                 senc = OPENSSL_malloc(slen_full);
3444                 if (!senc)
3445                         return -1;
3446                 p = senc;
3447                 i2d_SSL_SESSION(s->session, &p);
3448
3449                 /* create a fresh copy (not shared with other threads) to clean up */
3450                 const_p = senc;
3451                 sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
3452                 if (sess == NULL)
3453                         {
3454                         OPENSSL_free(senc);
3455                         return -1;
3456                         }
3457                 sess->session_id_length = 0; /* ID is irrelevant for the ticket */
3458
3459                 slen = i2d_SSL_SESSION(sess, NULL);
3460                 if (slen > slen_full) /* shouldn't ever happen */
3461                         {
3462                         OPENSSL_free(senc);
3463                         return -1;
3464                         }
3465                 p = senc;
3466                 i2d_SSL_SESSION(sess, &p);
3467                 SSL_SESSION_free(sess);
3468
3469                 /* Grow buffer if need be: the length calculation is as
3470                  * follows handshake_header_length +
3471                  * 4 (ticket lifetime hint) + 2 (ticket length) +
3472                  * 16 (key name) + max_iv_len (iv length) +
3473                  * session_length + max_enc_block_size (max encrypted session
3474                  * length) + max_md_size (HMAC).
3475                  */
3476                 if (!BUF_MEM_grow(s->init_buf,
3477                         SSL_HM_HEADER_LENGTH(s) + 22 + EVP_MAX_IV_LENGTH +
3478                         EVP_MAX_BLOCK_LENGTH + EVP_MAX_MD_SIZE + slen))
3479                         return -1;
3480                 p = ssl_handshake_start(s);
3481                 EVP_CIPHER_CTX_init(&ctx);
3482                 HMAC_CTX_init(&hctx);
3483                 /* Initialize HMAC and cipher contexts. If callback present
3484                  * it does all the work otherwise use generated values
3485                  * from parent ctx.
3486                  */
3487                 if (tctx->tlsext_ticket_key_cb)
3488                         {
3489                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3490                                                          &hctx, 1) < 0)
3491                                 {
3492                                 OPENSSL_free(senc);
3493                                 return -1;
3494                                 }
3495                         }
3496                 else
3497                         {
3498                         RAND_pseudo_bytes(iv, 16);
3499                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3500                                         tctx->tlsext_tick_aes_key, iv);
3501                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3502                                         tlsext_tick_md(), NULL);
3503                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3504                         }
3505
3506                 /* Ticket lifetime hint (advisory only):
3507                  * We leave this unspecified for resumed session (for simplicity),
3508                  * and guess that tickets for new sessions will live as long
3509                  * as their sessions. */
3510                 l2n(s->hit ? 0 : s->session->timeout, p);
3511
3512                 /* Skip ticket length for now */
3513                 p += 2;
3514                 /* Output key name */
3515                 macstart = p;
3516                 memcpy(p, key_name, 16);
3517                 p += 16;
3518                 /* output IV */
3519                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3520                 p += EVP_CIPHER_CTX_iv_length(&ctx);
3521                 /* Encrypt session data */
3522                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3523                 p += len;
3524                 EVP_EncryptFinal(&ctx, p, &len);
3525                 p += len;
3526                 EVP_CIPHER_CTX_cleanup(&ctx);
3527
3528                 HMAC_Update(&hctx, macstart, p - macstart);
3529                 HMAC_Final(&hctx, p, &hlen);
3530                 HMAC_CTX_cleanup(&hctx);
3531
3532                 p += hlen;
3533                 /* Now write out lengths: p points to end of data written */
3534                 /* Total length */
3535                 len = p - ssl_handshake_start(s);
3536                 ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, len);
3537                 /* Skip ticket lifetime hint */
3538                 p = ssl_handshake_start(s) + 4;
3539                 s2n(len - 6, p);
3540                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3541                 OPENSSL_free(senc);
3542                 }
3543
3544         /* SSL3_ST_SW_SESSION_TICKET_B */
3545         return ssl_do_write(s);
3546         }
3547
3548 int ssl3_send_cert_status(SSL *s)
3549         {
3550         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3551                 {
3552                 unsigned char *p;
3553                 /* Grow buffer if need be: the length calculation is as
3554                  * follows 1 (message type) + 3 (message length) +
3555                  * 1 (ocsp response type) + 3 (ocsp response length)
3556                  * + (ocsp response)
3557                  */
3558                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3559                         return -1;
3560
3561                 p=(unsigned char *)s->init_buf->data;
3562
3563                 /* do the header */
3564                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3565                 /* message length */
3566                 l2n3(s->tlsext_ocsp_resplen + 4, p);
3567                 /* status type */
3568                 *(p++)= s->tlsext_status_type;
3569                 /* length of OCSP response */
3570                 l2n3(s->tlsext_ocsp_resplen, p);
3571                 /* actual response */
3572                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3573                 /* number of bytes to write */
3574                 s->init_num = 8 + s->tlsext_ocsp_resplen;
3575                 s->state=SSL3_ST_SW_CERT_STATUS_B;
3576                 s->init_off = 0;
3577                 }
3578
3579         /* SSL3_ST_SW_CERT_STATUS_B */
3580         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3581         }
3582
3583 # ifndef OPENSSL_NO_NEXTPROTONEG
3584 /* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It
3585  * sets the next_proto member in s if found */
3586 int ssl3_get_next_proto(SSL *s)
3587         {
3588         int ok;
3589         int proto_len, padding_len;
3590         long n;
3591         const unsigned char *p;
3592
3593         /* Clients cannot send a NextProtocol message if we didn't see the
3594          * extension in their ClientHello */
3595         if (!s->s3->next_proto_neg_seen)
3596                 {
3597                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION);
3598                 return -1;
3599                 }
3600
3601         n=s->method->ssl_get_message(s,
3602                 SSL3_ST_SR_NEXT_PROTO_A,
3603                 SSL3_ST_SR_NEXT_PROTO_B,
3604                 SSL3_MT_NEXT_PROTO,
3605                 514,  /* See the payload format below */
3606                 &ok);
3607
3608         if (!ok)
3609                 return((int)n);
3610
3611         /* s->state doesn't reflect whether ChangeCipherSpec has been received
3612          * in this handshake, but s->s3->change_cipher_spec does (will be reset
3613          * by ssl3_get_finished). */
3614         if (!s->s3->change_cipher_spec)
3615                 {
3616                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS);
3617                 return -1;
3618                 }
3619
3620         if (n < 2)
3621                 return 0;  /* The body must be > 1 bytes long */
3622
3623         p=(unsigned char *)s->init_msg;
3624
3625         /* The payload looks like:
3626          *   uint8 proto_len;
3627          *   uint8 proto[proto_len];
3628          *   uint8 padding_len;
3629          *   uint8 padding[padding_len];
3630          */
3631         proto_len = p[0];
3632         if (proto_len + 2 > s->init_num)
3633                 return 0;
3634         padding_len = p[proto_len + 1];
3635         if (proto_len + padding_len + 2 != s->init_num)
3636                 return 0;
3637
3638         s->next_proto_negotiated = OPENSSL_malloc(proto_len);
3639         if (!s->next_proto_negotiated)
3640                 {
3641                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,ERR_R_MALLOC_FAILURE);
3642                 return 0;
3643                 }
3644         memcpy(s->next_proto_negotiated, p + 1, proto_len);
3645         s->next_proto_negotiated_len = proto_len;
3646
3647         return 1;
3648         }
3649 # endif
3650
3651 #endif