ssl/s3_srvr.c

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