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 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
 183                         ssl3_accept,
 184                         ssl_undefined_function,
 185                         ssl3_get_server_method)
 186
 187 int ssl3_accept(SSL *s)
 188         {
 189         BUF_MEM *buf;
 190         unsigned long alg_k,Time=(unsigned long)time(NULL);
 191         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 192         int ret= -1;
 193         int new_state,state,skip=0;
 194
 195         RAND_add(&Time,sizeof(Time),0);
 196         ERR_clear_error();
 197         clear_sys_error();
 198
 199         if (s->info_callback != NULL)
 200                 cb=s->info_callback;
 201         else if (s->ctx->info_callback != NULL)
 202                 cb=s->ctx->info_callback;
 203
 204         /* init things to blank */
 205         s->in_handshake++;
 206         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 207
 208         if (s->cert == NULL)
 209                 {
 210                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 211                 return(-1);
 212                 }
 213
 214         for (;;)
 215                 {
 216                 state=s->state;
 217
 218                 switch (s->state)
 219                         {
 220                 case SSL_ST_RENEGOTIATE:
 221                         s->renegotiate=1;
 222                         /* s->state=SSL_ST_ACCEPT; */
 223
 224                 case SSL_ST_BEFORE:
 225                 case SSL_ST_ACCEPT:
 226                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 227                 case SSL_ST_OK|SSL_ST_ACCEPT:
 228
 229                         s->server=1;
 230                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 231
 232                         if ((s->version>>8) != 3)
 233                                 {
 234                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 235                                 return -1;
 236                                 }
 237                         s->type=SSL_ST_ACCEPT;
 238
 239                         if (s->init_buf == NULL)
 240                                 {
 241                                 if ((buf=BUF_MEM_new()) == NULL)
 242                                         {
 243                                         ret= -1;
 244                                         goto end;
 245                                         }
 246                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 247                                         {
 248                                         ret= -1;
 249                                         goto end;
 250                                         }
 251                                 s->init_buf=buf;
 252                                 }
 253
 254                         if (!ssl3_setup_buffers(s))
 255                                 {
 256                                 ret= -1;
 257                                 goto end;
 258                                 }
 259
 260                         s->init_num=0;
 261
 262                         if (s->state != SSL_ST_RENEGOTIATE)
 263                                 {
 264                                 /* Ok, we now need to push on a buffering BIO so that
 265                                  * the output is sent in a way that TCP likes :-)
 266                                  */
 267                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 268
 269                                 ssl3_init_finished_mac(s);
 270                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 271                                 s->ctx->stats.sess_accept++;
 272                                 }
 273                         else if (!s->s3->send_connection_binding &&
 274                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
 275                                 {
 276                                 /* Server attempting to renegotiate with
 277                                  * client that doesn't support secure
 278                                  * renegotiation.
 279                                  */
 280                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
 281                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 282                                 ret = -1;
 283                                 goto end;
 284                                 }
 285                         else
 286                                 {
 287                                 /* s->state == SSL_ST_RENEGOTIATE,
 288                                  * we will just send a HelloRequest */
 289                                 s->ctx->stats.sess_accept_renegotiate++;
 290                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 291                                 }
 292                         break;
 293
 294                 case SSL3_ST_SW_HELLO_REQ_A:
 295                 case SSL3_ST_SW_HELLO_REQ_B:
 296
 297                         s->shutdown=0;
 298                         ret=ssl3_send_hello_request(s);
 299                         if (ret <= 0) goto end;
 300                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 301                         s->state=SSL3_ST_SW_FLUSH;
 302                         s->init_num=0;
 303
 304                         ssl3_init_finished_mac(s);
 305                         break;
 306
 307                 case SSL3_ST_SW_HELLO_REQ_C:
 308                         s->state=SSL_ST_OK;
 309                         break;
 310
 311                 case SSL3_ST_SR_CLNT_HELLO_A:
 312                 case SSL3_ST_SR_CLNT_HELLO_B:
 313                 case SSL3_ST_SR_CLNT_HELLO_C:
 314
 315                         s->shutdown=0;
 316                         ret=ssl3_get_client_hello(s);
 317                         if (ret <= 0) goto end;
 318
 319                         s->renegotiate = 2;
 320                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 321                         s->init_num=0;
 322                         break;
 323
 324                 case SSL3_ST_SW_SRVR_HELLO_A:
 325                 case SSL3_ST_SW_SRVR_HELLO_B:
 326                         ret=ssl3_send_server_hello(s);
 327                         if (ret <= 0) goto end;
 328 #ifndef OPENSSL_NO_TLSEXT
 329                         if (s->hit)
 330                                 {
 331                                 if (s->tlsext_ticket_expected)
 332                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 333                                 else
 334                                         s->state=SSL3_ST_SW_CHANGE_A;
 335                                 }
 336 #else
 337                         if (s->hit)
 338                                         s->state=SSL3_ST_SW_CHANGE_A;
 339 #endif
 340                         else
 341                                 s->state=SSL3_ST_SW_CERT_A;
 342                         s->init_num=0;
 343                         break;
 344
 345                 case SSL3_ST_SW_CERT_A:
 346                 case SSL3_ST_SW_CERT_B:
 347                         /* Check if it is anon DH or anon ECDH, */
 348                         /* normal PSK or KRB5 */
 349                         if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
 350                                 && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
 351                                 && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
 352                                 {
 353                                 ret=ssl3_send_server_certificate(s);
 354                                 if (ret <= 0) goto end;
 355 #ifndef OPENSSL_NO_TLSEXT
 356                                 if (s->tlsext_status_expected)
 357                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 358                                 else
 359                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 360                                 }
 361                         else
 362                                 {
 363                                 skip = 1;
 364                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 365                                 }
 366 #else
 367                                 }
 368                         else
 369                                 skip=1;
 370
 371                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 372 #endif
 373                         s->init_num=0;
 374                         break;
 375
 376                 case SSL3_ST_SW_KEY_EXCH_A:
 377                 case SSL3_ST_SW_KEY_EXCH_B:
 378                         alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 379
 380                         /* clear this, it may get reset by
 381                          * send_server_key_exchange */
 382                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 383 #ifndef OPENSSL_NO_KRB5
 384                                 && !(alg_k & SSL_kKRB5)
 385 #endif /* OPENSSL_NO_KRB5 */
 386                                 )
 387                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 388                                  * even when forbidden by protocol specs
 389                                  * (handshake may fail as clients are not required to
 390                                  * be able to handle this) */
 391                                 s->s3->tmp.use_rsa_tmp=1;
 392                         else
 393                                 s->s3->tmp.use_rsa_tmp=0;
 394
 395
 396                         /* only send if a DH key exchange, fortezza or
 397                          * RSA but we have a sign only certificate
 398                          *
 399                          * PSK: may send PSK identity hints
 400                          *
 401                          * For ECC ciphersuites, we send a serverKeyExchange
 402                          * message only if the cipher suite is either
 403                          * ECDH-anon or ECDHE. In other cases, the
 404                          * server certificate contains the server's
 405                          * public key for key exchange.
 406                          */
 407                         if (s->s3->tmp.use_rsa_tmp
 408                         /* PSK: send ServerKeyExchange if PSK identity
 409                          * hint if provided */
 410 #ifndef OPENSSL_NO_PSK
 411                             || ((alg_k & SSL_kPSK) && s->ctx->psk_identity_hint)
 412 #endif
 413                             || (alg_k & (SSL_kDHr|SSL_kDHd|SSL_kEDH))
 414                             || (alg_k & SSL_kEECDH)
 415                             || ((alg_k & SSL_kRSA)
 416                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 417                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 418                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 419                                         )
 420                                     )
 421                                 )
 422                             )
 423                                 {
 424                                 ret=ssl3_send_server_key_exchange(s);
 425                                 if (ret <= 0) goto end;
 426                                 }
 427                         else
 428                                 skip=1;
 429
 430                         s->state=SSL3_ST_SW_CERT_REQ_A;
 431                         s->init_num=0;
 432                         break;
 433
 434                 case SSL3_ST_SW_CERT_REQ_A:
 435                 case SSL3_ST_SW_CERT_REQ_B:
 436                         if (/* don't request cert unless asked for it: */
 437                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 438                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 439                                  * don't request cert during re-negotiation: */
 440                                 ((s->session->peer != NULL) &&
 441                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 442                                 /* never request cert in anonymous ciphersuites
 443                                  * (see section "Certificate request" in SSL 3 drafts
 444                                  * and in RFC 2246): */
 445                                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL) &&
 446                                  /* ... except when the application insists on verification
 447                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 448                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 449                                  /* never request cert in Kerberos ciphersuites */
 450                                 (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5)
 451                                 /* With normal PSK Certificates and
 452                                  * Certificate Requests are omitted */
 453                                 || (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 454                                 {
 455                                 /* no cert request */
 456                                 skip=1;
 457                                 s->s3->tmp.cert_request=0;
 458                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 459                                 }
 460                         else
 461                                 {
 462                                 s->s3->tmp.cert_request=1;
 463                                 ret=ssl3_send_certificate_request(s);
 464                                 if (ret <= 0) goto end;
 465 #ifndef NETSCAPE_HANG_BUG
 466                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 467 #else
 468                                 s->state=SSL3_ST_SW_FLUSH;
 469                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 470 #endif
 471                                 s->init_num=0;
 472                                 }
 473                         break;
 474
 475                 case SSL3_ST_SW_SRVR_DONE_A:
 476                 case SSL3_ST_SW_SRVR_DONE_B:
 477                         ret=ssl3_send_server_done(s);
 478                         if (ret <= 0) goto end;
 479                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 480                         s->state=SSL3_ST_SW_FLUSH;
 481                         s->init_num=0;
 482                         break;
 483
 484                 case SSL3_ST_SW_FLUSH:
 485
 486                         /* This code originally checked to see if
 487                          * any data was pending using BIO_CTRL_INFO
 488                          * and then flushed. This caused problems
 489                          * as documented in PR#1939. The proposed
 490                          * fix doesn't completely resolve this issue
 491                          * as buggy implementations of BIO_CTRL_PENDING
 492                          * still exist. So instead we just flush
 493                          * unconditionally.
 494                          */
 495
 496                         s->rwstate=SSL_WRITING;
 497                         if (BIO_flush(s->wbio) <= 0)
 498                                 {
 499                                 ret= -1;
 500                                 goto end;
 501                                 }
 502                         s->rwstate=SSL_NOTHING;
 503
 504                         s->state=s->s3->tmp.next_state;
 505                         break;
 506
 507                 case SSL3_ST_SR_CERT_A:
 508                 case SSL3_ST_SR_CERT_B:
 509                         /* Check for second client hello (MS SGC) */
 510                         ret = ssl3_check_client_hello(s);
 511                         if (ret <= 0)
 512                                 goto end;
 513                         if (ret == 2)
 514                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 515                         else {
 516                                 if (s->s3->tmp.cert_request)
 517                                         {
 518                                         ret=ssl3_get_client_certificate(s);
 519                                         if (ret <= 0) goto end;
 520                                         }
 521                                 s->init_num=0;
 522                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 523                         }
 524                         break;
 525
 526                 case SSL3_ST_SR_KEY_EXCH_A:
 527                 case SSL3_ST_SR_KEY_EXCH_B:
 528                         ret=ssl3_get_client_key_exchange(s);
 529                         if (ret <= 0)
 530                                 goto end;
 531                         if (ret == 2)
 532                                 {
 533                                 /* For the ECDH ciphersuites when
 534                                  * the client sends its ECDH pub key in
 535                                  * a certificate, the CertificateVerify
 536                                  * message is not sent.
 537                                  * Also for GOST ciphersuites when
 538                                  * the client uses its key from the certificate
 539                                  * for key exchange.
 540                                  */
 541 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 542                                 s->state=SSL3_ST_SR_FINISHED_A;
 543 #else
 544                                 if (s->s3->next_proto_neg_seen)
 545                                         s->state=SSL3_ST_SR_NEXT_PROTO_A;
 546                                 else
 547                                         s->state=SSL3_ST_SR_FINISHED_A;
 548 #endif
 549                                 s->init_num = 0;
 550                                 }
 551                         else
 552                                 {
 553                                 int offset=0;
 554                                 int dgst_num;
 555
 556                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 557                                 s->init_num=0;
 558
 559                                 /* We need to get hashes here so if there is
 560                                  * a client cert, it can be verified
 561                                  * FIXME - digest processing for CertificateVerify
 562                                  * should be generalized. But it is next step
 563                                  */
 564                                 if (s->s3->handshake_buffer)
 565                                         if (!ssl3_digest_cached_records(s))
 566                                                 return -1;
 567                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
 568                                         if (s->s3->handshake_dgst[dgst_num])
 569                                                 {
 570                                                 int dgst_size;
 571
 572                                                 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]));
 573                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
 574                                                 if (dgst_size < 0)
 575                                                         {
 576                                                         ret = -1;
 577                                                         goto end;
 578                                                         }
 579                                                 offset+=dgst_size;
 580                                                 }
 581                                 }
 582                         break;
 583
 584                 case SSL3_ST_SR_CERT_VRFY_A:
 585                 case SSL3_ST_SR_CERT_VRFY_B:
 586
 587                         /* we should decide if we expected this one */
 588                         ret=ssl3_get_cert_verify(s);
 589                         if (ret <= 0) goto end;
 590
 591 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 592                         s->state=SSL3_ST_SR_FINISHED_A;
 593 #else
 594                         if (s->s3->next_proto_neg_seen)
 595                                 s->state=SSL3_ST_SR_NEXT_PROTO_A;
 596                         else
 597                                 s->state=SSL3_ST_SR_FINISHED_A;
 598 #endif
 599                         s->init_num=0;
 600                         break;
 601
 602 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 603                 case SSL3_ST_SR_NEXT_PROTO_A:
 604                 case SSL3_ST_SR_NEXT_PROTO_B:
 605                         ret=ssl3_get_next_proto(s);
 606                         if (ret <= 0) goto end;
 607                         s->init_num = 0;
 608                         s->state=SSL3_ST_SR_FINISHED_A;
 609                         break;
 610 #endif
 611
 612                 case SSL3_ST_SR_FINISHED_A:
 613                 case SSL3_ST_SR_FINISHED_B:
 614                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 615                                 SSL3_ST_SR_FINISHED_B);
 616                         if (ret <= 0) goto end;
 617 #ifndef OPENSSL_NO_TLSEXT
 618                         if (s->tlsext_ticket_expected)
 619                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 620                         else if (s->hit)
 621                                 s->state=SSL_ST_OK;
 622 #else
 623                         if (s->hit)
 624                                 s->state=SSL_ST_OK;
 625 #endif
 626                         else
 627                                 s->state=SSL3_ST_SW_CHANGE_A;
 628                         s->init_num=0;
 629                         break;
 630
 631 #ifndef OPENSSL_NO_TLSEXT
 632                 case SSL3_ST_SW_SESSION_TICKET_A:
 633                 case SSL3_ST_SW_SESSION_TICKET_B:
 634                         ret=ssl3_send_newsession_ticket(s);
 635                         if (ret <= 0) goto end;
 636                         s->state=SSL3_ST_SW_CHANGE_A;
 637                         s->init_num=0;
 638                         break;
 639
 640                 case SSL3_ST_SW_CERT_STATUS_A:
 641                 case SSL3_ST_SW_CERT_STATUS_B:
 642                         ret=ssl3_send_cert_status(s);
 643                         if (ret <= 0) goto end;
 644                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 645                         s->init_num=0;
 646                         break;
 647
 648 #endif
 649
 650                 case SSL3_ST_SW_CHANGE_A:
 651                 case SSL3_ST_SW_CHANGE_B:
 652
 653                         s->session->cipher=s->s3->tmp.new_cipher;
 654                         if (!s->method->ssl3_enc->setup_key_block(s))
 655                                 { ret= -1; goto end; }
 656
 657                         ret=ssl3_send_change_cipher_spec(s,
 658                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 659
 660                         if (ret <= 0) goto end;
 661                         s->state=SSL3_ST_SW_FINISHED_A;
 662                         s->init_num=0;
 663
 664                         if (!s->method->ssl3_enc->change_cipher_state(s,
 665                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 666                                 {
 667                                 ret= -1;
 668                                 goto end;
 669                                 }
 670
 671                         break;
 672
 673                 case SSL3_ST_SW_FINISHED_A:
 674                 case SSL3_ST_SW_FINISHED_B:
 675                         ret=ssl3_send_finished(s,
 676                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 677                                 s->method->ssl3_enc->server_finished_label,
 678                                 s->method->ssl3_enc->server_finished_label_len);
 679                         if (ret <= 0) goto end;
 680                         s->state=SSL3_ST_SW_FLUSH;
 681                         if (s->hit)
 682                                 {
 683 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 684                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 685 #else
 686                                 if (s->s3->next_proto_neg_seen)
 687                                         s->s3->tmp.next_state=SSL3_ST_SR_NEXT_PROTO_A;
 688                                 else
 689                                         s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 690 #endif
 691                                 }
 692                         else
 693                                 s->s3->tmp.next_state=SSL_ST_OK;
 694                         s->init_num=0;
 695                         break;
 696
 697                 case SSL_ST_OK:
 698                         /* clean a few things up */
 699                         ssl3_cleanup_key_block(s);
 700
 701                         BUF_MEM_free(s->init_buf);
 702                         s->init_buf=NULL;
 703
 704                         /* remove buffering on output */
 705                         ssl_free_wbio_buffer(s);
 706
 707                         s->init_num=0;
 708
 709                         if (s->renegotiate == 2) /* skipped if we just sent a HelloRequest */
 710                                 {
 711                                 /* actually not necessarily a 'new' session unless
 712                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 713
 714                                 s->renegotiate=0;
 715                                 s->new_session=0;
 716
 717                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 718
 719                                 s->ctx->stats.sess_accept_good++;
 720                                 /* s->server=1; */
 721                                 s->handshake_func=ssl3_accept;
 722
 723                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 724                                 }
 725
 726                         ret = 1;
 727                         goto end;
 728                         /* break; */
 729
 730                 default:
 731                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 732                         ret= -1;
 733                         goto end;
 734                         /* break; */
 735                         }
 736
 737                 if (!s->s3->tmp.reuse_message && !skip)
 738                         {
 739                         if (s->debug)
 740                                 {
 741                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 742                                         goto end;
 743                                 }
 744
 745
 746                         if ((cb != NULL) && (s->state != state))
 747                                 {
 748                                 new_state=s->state;
 749                                 s->state=state;
 750                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 751                                 s->state=new_state;
 752                                 }
 753                         }
 754                 skip=0;
 755                 }
 756 end:
 757         /* BIO_flush(s->wbio); */
 758
 759         s->in_handshake--;
 760         if (cb != NULL)
 761                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 762         return(ret);
 763         }
 764
 765 int ssl3_send_hello_request(SSL *s)
 766         {
 767         unsigned char *p;
 768
 769         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 770                 {
 771                 p=(unsigned char *)s->init_buf->data;
 772                 *(p++)=SSL3_MT_HELLO_REQUEST;
 773                 *(p++)=0;
 774                 *(p++)=0;
 775                 *(p++)=0;
 776
 777                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 778                 /* number of bytes to write */
 779                 s->init_num=4;
 780                 s->init_off=0;
 781                 }
 782
 783         /* SSL3_ST_SW_HELLO_REQ_B */
 784         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 785         }
 786
 787 int ssl3_check_client_hello(SSL *s)
 788         {
 789         int ok;
 790         long n;
 791
 792         /* this function is called when we really expect a Certificate message,
 793          * so permit appropriate message length */
 794         n=s->method->ssl_get_message(s,
 795                 SSL3_ST_SR_CERT_A,
 796                 SSL3_ST_SR_CERT_B,
 797                 -1,
 798                 s->max_cert_list,
 799                 &ok);
 800         if (!ok) return((int)n);
 801         s->s3->tmp.reuse_message = 1;
 802         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 803                 {
 804                 /* Throw away what we have done so far in the current handshake,
 805                  * which will now be aborted. (A full SSL_clear would be too much.)
 806                  * I hope that tmp.dh is the only thing that may need to be cleared
 807                  * when a handshake is not completed ... */
 808 #ifndef OPENSSL_NO_DH
 809                 if (s->s3->tmp.dh != NULL)
 810                         {
 811                         DH_free(s->s3->tmp.dh);
 812                         s->s3->tmp.dh = NULL;
 813                         }
 814 #endif
 815                 return 2;
 816                 }
 817         return 1;
 818 }
 819
 820 int ssl3_get_client_hello(SSL *s)
 821         {
 822         int i,j,ok,al,ret= -1;
 823         unsigned int cookie_len;
 824         long n;
 825         unsigned long id;
 826         unsigned char *p,*d,*q;
 827         SSL_CIPHER *c;
 828 #ifndef OPENSSL_NO_COMP
 829         SSL_COMP *comp=NULL;
 830 #endif
 831         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 832
 833         /* We do this so that we will respond with our native type.
 834          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 835          * This down switching should be handled by a different method.
 836          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 837          * TLSv1.
 838          */
 839         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 840                 {
 841                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 842                 }
 843         s->first_packet=1;
 844         n=s->method->ssl_get_message(s,
 845                 SSL3_ST_SR_CLNT_HELLO_B,
 846                 SSL3_ST_SR_CLNT_HELLO_C,
 847                 SSL3_MT_CLIENT_HELLO,
 848                 SSL3_RT_MAX_PLAIN_LENGTH,
 849                 &ok);
 850
 851         if (!ok) return((int)n);
 852         s->first_packet=0;
 853         d=p=(unsigned char *)s->init_msg;
 854
 855         /* use version from inside client hello, not from record header
 856          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 857         s->client_version=(((int)p[0])<<8)|(int)p[1];
 858         p+=2;
 859
 860         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 861             (s->version != DTLS1_VERSION && s->client_version < s->version))
 862                 {
 863                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 864                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 865                         {
 866                         /* similar to ssl3_get_record, send alert using remote version number */
 867                         s->version = s->client_version;
 868                         }
 869                 al = SSL_AD_PROTOCOL_VERSION;
 870                 goto f_err;
 871                 }
 872
 873         /* If we require cookies and this ClientHello doesn't
 874          * contain one, just return since we do not want to
 875          * allocate any memory yet. So check cookie length...
 876          */
 877         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
 878                 {
 879                 unsigned int session_length, cookie_length;
 880
 881                 session_length = *(p + SSL3_RANDOM_SIZE);
 882                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
 883
 884                 if (cookie_length == 0)
 885                         return 1;
 886                 }
 887
 888         /* load the client random */
 889         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 890         p+=SSL3_RANDOM_SIZE;
 891
 892         /* get the session-id */
 893         j= *(p++);
 894
 895         s->hit=0;
 896         /* Versions before 0.9.7 always allow session reuse during renegotiation
 897          * (i.e. when s->new_session is true), option
 898          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
 899          * Maybe this optional behaviour should always have been the default,
 900          * but we cannot safely change the default behaviour (or new applications
 901          * might be written that become totally unsecure when compiled with
 902          * an earlier library version)
 903          */
 904         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 905                 {
 906                 if (!ssl_get_new_session(s,1))
 907                         goto err;
 908                 }
 909         else
 910                 {
 911                 i=ssl_get_prev_session(s, p, j, d + n);
 912                 if (i == 1)
 913                         { /* previous session */
 914                         s->hit=1;
 915                         }
 916                 else if (i == -1)
 917                         goto err;
 918                 else /* i == 0 */
 919                         {
 920                         if (!ssl_get_new_session(s,1))
 921                                 goto err;
 922                         }
 923                 }
 924
 925         p+=j;
 926
 927         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
 928                 {
 929                 /* cookie stuff */
 930                 cookie_len = *(p++);
 931
 932                 /*
 933                  * The ClientHello may contain a cookie even if the
 934                  * HelloVerify message has not been sent--make sure that it
 935                  * does not cause an overflow.
 936                  */
 937                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
 938                         {
 939                         /* too much data */
 940                         al = SSL_AD_DECODE_ERROR;
 941                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 942                         goto f_err;
 943                         }
 944
 945                 /* verify the cookie if appropriate option is set. */
 946                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 947                         cookie_len > 0)
 948                         {
 949                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
 950
 951                         if ( s->ctx->app_verify_cookie_cb != NULL)
 952                                 {
 953                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
 954                                         cookie_len) == 0)
 955                                         {
 956                                         al=SSL_AD_HANDSHAKE_FAILURE;
 957                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 958                                                 SSL_R_COOKIE_MISMATCH);
 959                                         goto f_err;
 960                                         }
 961                                 /* else cookie verification succeeded */
 962                                 }
 963                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
 964                                                   s->d1->cookie_len) != 0) /* default verification */
 965                                 {
 966                                         al=SSL_AD_HANDSHAKE_FAILURE;
 967                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 968                                                 SSL_R_COOKIE_MISMATCH);
 969                                         goto f_err;
 970                                 }
 971
 972                         ret = 2;
 973                         }
 974
 975                 p += cookie_len;
 976                 }
 977
 978         n2s(p,i);
 979         if ((i == 0) && (j != 0))
 980                 {
 981                 /* we need a cipher if we are not resuming a session */
 982                 al=SSL_AD_ILLEGAL_PARAMETER;
 983                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 984                 goto f_err;
 985                 }
 986         if ((p+i) >= (d+n))
 987                 {
 988                 /* not enough data */
 989                 al=SSL_AD_DECODE_ERROR;
 990                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 991                 goto f_err;
 992                 }
 993         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 994                 == NULL))
 995                 {
 996                 goto err;
 997                 }
 998         p+=i;
 999
1000         /* If it is a hit, check that the cipher is in the list */
1001         if ((s->hit) && (i > 0))
1002                 {
1003                 j=0;
1004                 id=s->session->cipher->id;
1005
1006 #ifdef CIPHER_DEBUG
1007                 printf("client sent %d ciphers\n",sk_num(ciphers));
1008 #endif
1009                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
1010                         {
1011                         c=sk_SSL_CIPHER_value(ciphers,i);
1012 #ifdef CIPHER_DEBUG
1013                         printf("client [%2d of %2d]:%s\n",
1014                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
1015 #endif
1016                         if (c->id == id)
1017                                 {
1018                                 j=1;
1019                                 break;
1020                                 }
1021                         }
1022 /* Disabled because it can be used in a ciphersuite downgrade
1023  * attack: CVE-2010-4180.
1024  */
1025 #if 0
1026                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
1027                         {
1028                         /* Special case as client bug workaround: the previously used cipher may
1029                          * not be in the current list, the client instead might be trying to
1030                          * continue using a cipher that before wasn't chosen due to server
1031                          * preferences.  We'll have to reject the connection if the cipher is not
1032                          * enabled, though. */
1033                         c = sk_SSL_CIPHER_value(ciphers, 0);
1034                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1035                                 {
1036                                 s->session->cipher = c;
1037                                 j = 1;
1038                                 }
1039                         }
1040 #endif
1041                 if (j == 0)
1042                         {
1043                         /* we need to have the cipher in the cipher
1044                          * list if we are asked to reuse it */
1045                         al=SSL_AD_ILLEGAL_PARAMETER;
1046                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1047                         goto f_err;
1048                         }
1049                 }
1050
1051         /* compression */
1052         i= *(p++);
1053         if ((p+i) > (d+n))
1054                 {
1055                 /* not enough data */
1056                 al=SSL_AD_DECODE_ERROR;
1057                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1058                 goto f_err;
1059                 }
1060         q=p;
1061         for (j=0; j<i; j++)
1062                 {
1063                 if (p[j] == 0) break;
1064                 }
1065
1066         p+=i;
1067         if (j >= i)
1068                 {
1069                 /* no compress */
1070                 al=SSL_AD_DECODE_ERROR;
1071                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1072                 goto f_err;
1073                 }
1074
1075 #ifndef OPENSSL_NO_TLSEXT
1076         /* TLS extensions*/
1077         if (s->version >= SSL3_VERSION)
1078                 {
1079                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1080                         {
1081                         /* 'al' set by ssl_parse_clienthello_tlsext */
1082                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1083                         goto f_err;
1084                         }
1085                 }
1086                 if (ssl_check_clienthello_tlsext(s) <= 0) {
1087                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1088                         goto err;
1089                 }
1090
1091         /* Check if we want to use external pre-shared secret for this
1092          * handshake for not reused session only. We need to generate
1093          * server_random before calling tls_session_secret_cb in order to allow
1094          * SessionTicket processing to use it in key derivation. */
1095         {
1096                 unsigned long Time;
1097                 unsigned char *pos;
1098                 Time=(unsigned long)time(NULL);                 /* Time */
1099                 pos=s->s3->server_random;
1100                 l2n(Time,pos);
1101                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1102                         {
1103                         al=SSL_AD_INTERNAL_ERROR;
1104                         goto f_err;
1105                         }
1106         }
1107
1108         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1109                 {
1110                 SSL_CIPHER *pref_cipher=NULL;
1111
1112                 s->session->master_key_length=sizeof(s->session->master_key);
1113                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1114                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1115                         {
1116                         s->hit=1;
1117                         s->session->ciphers=ciphers;
1118                         s->session->verify_result=X509_V_OK;
1119
1120                         ciphers=NULL;
1121
1122                         /* check if some cipher was preferred by call back */
1123                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1124                         if (pref_cipher == NULL)
1125                                 {
1126                                 al=SSL_AD_HANDSHAKE_FAILURE;
1127                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1128                                 goto f_err;
1129                                 }
1130
1131                         s->session->cipher=pref_cipher;
1132
1133                         if (s->cipher_list)
1134                                 sk_SSL_CIPHER_free(s->cipher_list);
1135
1136                         if (s->cipher_list_by_id)
1137                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1138
1139                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1140                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1141                         }
1142                 }
1143 #endif
1144
1145         /* Worst case, we will use the NULL compression, but if we have other
1146          * options, we will now look for them.  We have i-1 compression
1147          * algorithms from the client, starting at q. */
1148         s->s3->tmp.new_compression=NULL;
1149 #ifndef OPENSSL_NO_COMP
1150         /* This only happens if we have a cache hit */
1151         if (s->session->compress_meth != 0)
1152                 {
1153                 int m, comp_id = s->session->compress_meth;
1154                 /* Perform sanity checks on resumed compression algorithm */
1155                 /* Can't disable compression */
1156                 if (s->options & SSL_OP_NO_COMPRESSION)
1157                         {
1158                         al=SSL_AD_INTERNAL_ERROR;
1159                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1160                         goto f_err;
1161                         }
1162                 /* Look for resumed compression method */
1163                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1164                         {
1165                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1166                         if (comp_id == comp->id)
1167                                 {
1168                                 s->s3->tmp.new_compression=comp;
1169                                 break;
1170                                 }
1171                         }
1172                 if (s->s3->tmp.new_compression == NULL)
1173                         {
1174                         al=SSL_AD_INTERNAL_ERROR;
1175                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1176                         goto f_err;
1177                         }
1178                 /* Look for resumed method in compression list */
1179                 for (m = 0; m < i; m++)
1180                         {
1181                         if (q[m] == comp_id)
1182                                 break;
1183                         }
1184                 if (m >= i)
1185                         {
1186                         al=SSL_AD_ILLEGAL_PARAMETER;
1187                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1188                         goto f_err;
1189                         }
1190                 }
1191         else if (s->hit)
1192                 comp = NULL;
1193         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1194                 { /* See if we have a match */
1195                 int m,nn,o,v,done=0;
1196
1197                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1198                 for (m=0; m<nn; m++)
1199                         {
1200                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1201                         v=comp->id;
1202                         for (o=0; o<i; o++)
1203                                 {
1204                                 if (v == q[o])
1205                                         {
1206                                         done=1;
1207                                         break;
1208                                         }
1209                                 }
1210                         if (done) break;
1211                         }
1212                 if (done)
1213                         s->s3->tmp.new_compression=comp;
1214                 else
1215                         comp=NULL;
1216                 }
1217 #else
1218         /* If compression is disabled we'd better not try to resume a session
1219          * using compression.
1220          */
1221         if (s->session->compress_meth != 0)
1222                 {
1223                 al=SSL_AD_INTERNAL_ERROR;
1224                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1225                 goto f_err;
1226                 }
1227 #endif
1228
1229         /* Given s->session->ciphers and SSL_get_ciphers, we must
1230          * pick a cipher */
1231
1232         if (!s->hit)
1233                 {
1234 #ifdef OPENSSL_NO_COMP
1235                 s->session->compress_meth=0;
1236 #else
1237                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1238 #endif
1239                 if (s->session->ciphers != NULL)
1240                         sk_SSL_CIPHER_free(s->session->ciphers);
1241                 s->session->ciphers=ciphers;
1242                 if (ciphers == NULL)
1243                         {
1244                         al=SSL_AD_ILLEGAL_PARAMETER;
1245                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1246                         goto f_err;
1247                         }
1248                 ciphers=NULL;
1249                 c=ssl3_choose_cipher(s,s->session->ciphers,
1250                                      SSL_get_ciphers(s));
1251
1252                 if (c == NULL)
1253                         {
1254                         al=SSL_AD_HANDSHAKE_FAILURE;
1255                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1256                         goto f_err;
1257                         }
1258                 s->s3->tmp.new_cipher=c;
1259                 /* check whether we should disable session resumption */
1260                 if (s->not_resumable_session_cb != NULL)
1261                         s->session->not_resumable=s->not_resumable_session_cb(s,
1262                                 ((c->algorithm_mkey & (SSL_kEDH | SSL_kEECDH)) != 0));
1263                 if (s->session->not_resumable)
1264                         /* do not send a session ticket */
1265                         s->tlsext_ticket_expected = 0;
1266                 }
1267         else
1268                 {
1269                 /* Session-id reuse */
1270 #ifdef REUSE_CIPHER_BUG
1271                 STACK_OF(SSL_CIPHER) *sk;
1272                 SSL_CIPHER *nc=NULL;
1273                 SSL_CIPHER *ec=NULL;
1274
1275                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1276                         {
1277                         sk=s->session->ciphers;
1278                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1279                                 {
1280                                 c=sk_SSL_CIPHER_value(sk,i);
1281                                 if (c->algorithm_enc & SSL_eNULL)
1282                                         nc=c;
1283                                 if (SSL_C_IS_EXPORT(c))
1284                                         ec=c;
1285                                 }
1286                         if (nc != NULL)
1287                                 s->s3->tmp.new_cipher=nc;
1288                         else if (ec != NULL)
1289                                 s->s3->tmp.new_cipher=ec;
1290                         else
1291                                 s->s3->tmp.new_cipher=s->session->cipher;
1292                         }
1293                 else
1294 #endif
1295                 s->s3->tmp.new_cipher=s->session->cipher;
1296                 }
1297
1298         if (!ssl3_digest_cached_records(s))
1299                 goto f_err;
1300
1301         /* we now have the following setup.
1302          * client_random
1303          * cipher_list          - our prefered list of ciphers
1304          * ciphers              - the clients prefered list of ciphers
1305          * compression          - basically ignored right now
1306          * ssl version is set   - sslv3
1307          * s->session           - The ssl session has been setup.
1308          * s->hit               - session reuse flag
1309          * s->tmp.new_cipher    - the new cipher to use.
1310          */
1311
1312         if (ret < 0) ret=1;
1313         if (0)
1314                 {
1315 f_err:
1316                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1317                 }
1318 err:
1319         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1320         return(ret);
1321         }
1322
1323 int ssl3_send_server_hello(SSL *s)
1324         {
1325         unsigned char *buf;
1326         unsigned char *p,*d;
1327         int i,sl;
1328         unsigned long l;
1329 #ifdef OPENSSL_NO_TLSEXT
1330         unsigned long Time;
1331 #endif
1332
1333         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1334                 {
1335                 buf=(unsigned char *)s->init_buf->data;
1336 #ifdef OPENSSL_NO_TLSEXT
1337                 p=s->s3->server_random;
1338                 /* Generate server_random if it was not needed previously */
1339                 Time=(unsigned long)time(NULL);                 /* Time */
1340                 l2n(Time,p);
1341                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1342                         return -1;
1343 #endif
1344                 /* Do the message type and length last */
1345                 d=p= &(buf[4]);
1346
1347                 *(p++)=s->version>>8;
1348                 *(p++)=s->version&0xff;
1349
1350                 /* Random stuff */
1351                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1352                 p+=SSL3_RANDOM_SIZE;
1353
1354                 /* now in theory we have 3 options to sending back the
1355                  * session id.  If it is a re-use, we send back the
1356                  * old session-id, if it is a new session, we send
1357                  * back the new session-id or we send back a 0 length
1358                  * session-id if we want it to be single use.
1359                  * Currently I will not implement the '0' length session-id
1360                  * 12-Jan-98 - I'll now support the '0' length stuff.
1361                  *
1362                  * We also have an additional case where stateless session
1363                  * resumption is successful: we always send back the old
1364                  * session id. In this case s->hit is non zero: this can
1365                  * only happen if stateless session resumption is succesful
1366                  * if session caching is disabled so existing functionality
1367                  * is unaffected.
1368                  */
1369                 if (s->session->not_resumable ||
1370                         (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1371                                 && !s->hit))
1372                         s->session->session_id_length=0;
1373
1374                 sl=s->session->session_id_length;
1375                 if (sl > (int)sizeof(s->session->session_id))
1376                         {
1377                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1378                         return -1;
1379                         }
1380                 *(p++)=sl;
1381                 memcpy(p,s->session->session_id,sl);
1382                 p+=sl;
1383
1384                 /* put the cipher */
1385                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1386                 p+=i;
1387
1388                 /* put the compression method */
1389 #ifdef OPENSSL_NO_COMP
1390                         *(p++)=0;
1391 #else
1392                 if (s->s3->tmp.new_compression == NULL)
1393                         *(p++)=0;
1394                 else
1395                         *(p++)=s->s3->tmp.new_compression->id;
1396 #endif
1397 #ifndef OPENSSL_NO_TLSEXT
1398                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1399                         {
1400                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1401                         return -1;
1402                         }
1403                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1404                         {
1405                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1406                         return -1;
1407                         }
1408 #endif
1409                 /* do the header */
1410                 l=(p-d);
1411                 d=buf;
1412                 *(d++)=SSL3_MT_SERVER_HELLO;
1413                 l2n3(l,d);
1414
1415                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1416                 /* number of bytes to write */
1417                 s->init_num=p-buf;
1418                 s->init_off=0;
1419                 }
1420
1421         /* SSL3_ST_SW_SRVR_HELLO_B */
1422         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1423         }
1424
1425 int ssl3_send_server_done(SSL *s)
1426         {
1427         unsigned char *p;
1428
1429         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1430                 {
1431                 p=(unsigned char *)s->init_buf->data;
1432
1433                 /* do the header */
1434                 *(p++)=SSL3_MT_SERVER_DONE;
1435                 *(p++)=0;
1436                 *(p++)=0;
1437                 *(p++)=0;
1438
1439                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1440                 /* number of bytes to write */
1441                 s->init_num=4;
1442                 s->init_off=0;
1443                 }
1444
1445         /* SSL3_ST_SW_SRVR_DONE_B */
1446         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1447         }
1448
1449 int ssl3_send_server_key_exchange(SSL *s)
1450         {
1451 #ifndef OPENSSL_NO_RSA
1452         unsigned char *q;
1453         int j,num;
1454         RSA *rsa;
1455         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1456         unsigned int u;
1457 #endif
1458 #ifndef OPENSSL_NO_DH
1459         DH *dh=NULL,*dhp;
1460 #endif
1461 #ifndef OPENSSL_NO_ECDH
1462         EC_KEY *ecdh=NULL, *ecdhp;
1463         unsigned char *encodedPoint = NULL;
1464         int encodedlen = 0;
1465         int curve_id = 0;
1466         BN_CTX *bn_ctx = NULL;
1467 #endif
1468         EVP_PKEY *pkey;
1469         unsigned char *p,*d;
1470         int al,i;
1471         unsigned long type;
1472         int n;
1473         CERT *cert;
1474         BIGNUM *r[4];
1475         int nr[4],kn;
1476         BUF_MEM *buf;
1477         EVP_MD_CTX md_ctx;
1478
1479         EVP_MD_CTX_init(&md_ctx);
1480         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1481                 {
1482                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1483                 cert=s->cert;
1484
1485                 buf=s->init_buf;
1486
1487                 r[0]=r[1]=r[2]=r[3]=NULL;
1488                 n=0;
1489 #ifndef OPENSSL_NO_RSA
1490                 if (type & SSL_kRSA)
1491                         {
1492                         rsa=cert->rsa_tmp;
1493                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1494                                 {
1495                                 rsa=s->cert->rsa_tmp_cb(s,
1496                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1497                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1498                                 if(rsa == NULL)
1499                                 {
1500                                         al=SSL_AD_HANDSHAKE_FAILURE;
1501                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1502                                         goto f_err;
1503                                 }
1504                                 RSA_up_ref(rsa);
1505                                 cert->rsa_tmp=rsa;
1506                                 }
1507                         if (rsa == NULL)
1508                                 {
1509                                 al=SSL_AD_HANDSHAKE_FAILURE;
1510                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1511                                 goto f_err;
1512                                 }
1513                         r[0]=rsa->n;
1514                         r[1]=rsa->e;
1515                         s->s3->tmp.use_rsa_tmp=1;
1516                         }
1517                 else
1518 #endif
1519 #ifndef OPENSSL_NO_DH
1520                         if (type & SSL_kEDH)
1521                         {
1522                         dhp=cert->dh_tmp;
1523                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1524                                 dhp=s->cert->dh_tmp_cb(s,
1525                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1526                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1527                         if (dhp == NULL)
1528                                 {
1529                                 al=SSL_AD_HANDSHAKE_FAILURE;
1530                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1531                                 goto f_err;
1532                                 }
1533
1534                         if (s->s3->tmp.dh != NULL)
1535                                 {
1536                                 DH_free(dh);
1537                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1538                                 goto err;
1539                                 }
1540
1541                         if ((dh=DHparams_dup(dhp)) == NULL)
1542                                 {
1543                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1544                                 goto err;
1545                                 }
1546
1547                         s->s3->tmp.dh=dh;
1548                         if ((dhp->pub_key == NULL ||
1549                              dhp->priv_key == NULL ||
1550                              (s->options & SSL_OP_SINGLE_DH_USE)))
1551                                 {
1552                                 if(!DH_generate_key(dh))
1553                                     {
1554                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1555                                            ERR_R_DH_LIB);
1556                                     goto err;
1557                                     }
1558                                 }
1559                         else
1560                                 {
1561                                 dh->pub_key=BN_dup(dhp->pub_key);
1562                                 dh->priv_key=BN_dup(dhp->priv_key);
1563                                 if ((dh->pub_key == NULL) ||
1564                                         (dh->priv_key == NULL))
1565                                         {
1566                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1567                                         goto err;
1568                                         }
1569                                 }
1570                         r[0]=dh->p;
1571                         r[1]=dh->g;
1572                         r[2]=dh->pub_key;
1573                         }
1574                 else
1575 #endif
1576 #ifndef OPENSSL_NO_ECDH
1577                         if (type & SSL_kEECDH)
1578                         {
1579                         const EC_GROUP *group;
1580
1581                         ecdhp=cert->ecdh_tmp;
1582                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1583                                 {
1584                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1585                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1586                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1587                                 }
1588                         if (ecdhp == NULL)
1589                                 {
1590                                 al=SSL_AD_HANDSHAKE_FAILURE;
1591                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1592                                 goto f_err;
1593                                 }
1594
1595                         if (s->s3->tmp.ecdh != NULL)
1596                                 {
1597                                 EC_KEY_free(s->s3->tmp.ecdh);
1598                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1599                                 goto err;
1600                                 }
1601
1602                         /* Duplicate the ECDH structure. */
1603                         if (ecdhp == NULL)
1604                                 {
1605                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1606                                 goto err;
1607                                 }
1608                         if (!EC_KEY_up_ref(ecdhp))
1609                                 {
1610                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1611                                 goto err;
1612                                 }
1613                         ecdh = ecdhp;
1614
1615                         s->s3->tmp.ecdh=ecdh;
1616                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1617                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1618                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1619                                 {
1620                                 if(!EC_KEY_generate_key(ecdh))
1621                                     {
1622                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1623                                     goto err;
1624                                     }
1625                                 }
1626
1627                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1628                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1629                             (EC_KEY_get0_private_key(ecdh) == NULL))
1630                                 {
1631                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1632                                 goto err;
1633                                 }
1634
1635                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1636                             (EC_GROUP_get_degree(group) > 163))
1637                                 {
1638                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1639                                 goto err;
1640                                 }
1641
1642                         /* XXX: For now, we only support ephemeral ECDH
1643                          * keys over named (not generic) curves. For
1644                          * supported named curves, curve_id is non-zero.
1645                          */
1646                         if ((curve_id =
1647                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1648                             == 0)
1649                                 {
1650                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1651                                 goto err;
1652                                 }
1653
1654                         /* Encode the public key.
1655                          * First check the size of encoding and
1656                          * allocate memory accordingly.
1657                          */
1658                         encodedlen = EC_POINT_point2oct(group,
1659                             EC_KEY_get0_public_key(ecdh),
1660                             POINT_CONVERSION_UNCOMPRESSED,
1661                             NULL, 0, NULL);
1662
1663                         encodedPoint = (unsigned char *)
1664                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1665                         bn_ctx = BN_CTX_new();
1666                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1667                                 {
1668                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1669                                 goto err;
1670                                 }
1671
1672
1673                         encodedlen = EC_POINT_point2oct(group,
1674                             EC_KEY_get0_public_key(ecdh),
1675                             POINT_CONVERSION_UNCOMPRESSED,
1676                             encodedPoint, encodedlen, bn_ctx);
1677
1678                         if (encodedlen == 0)
1679                                 {
1680                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1681                                 goto err;
1682                                 }
1683
1684                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1685
1686                         /* XXX: For now, we only support named (not
1687                          * generic) curves in ECDH ephemeral key exchanges.
1688                          * In this situation, we need four additional bytes
1689                          * to encode the entire ServerECDHParams
1690                          * structure.
1691                          */
1692                         n = 4 + encodedlen;
1693
1694                         /* We'll generate the serverKeyExchange message
1695                          * explicitly so we can set these to NULLs
1696                          */
1697                         r[0]=NULL;
1698                         r[1]=NULL;
1699                         r[2]=NULL;
1700                         r[3]=NULL;
1701                         }
1702                 else
1703 #endif /* !OPENSSL_NO_ECDH */
1704 #ifndef OPENSSL_NO_PSK
1705                         if (type & SSL_kPSK)
1706                                 {
1707                                 /* reserve size for record length and PSK identity hint*/
1708                                 n+=2+strlen(s->ctx->psk_identity_hint);
1709                                 }
1710                         else
1711 #endif /* !OPENSSL_NO_PSK */
1712                         {
1713                         al=SSL_AD_HANDSHAKE_FAILURE;
1714                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1715                         goto f_err;
1716                         }
1717                 for (i=0; r[i] != NULL; i++)
1718                         {
1719                         nr[i]=BN_num_bytes(r[i]);
1720                         n+=2+nr[i];
1721                         }
1722
1723                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1724                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1725                         {
1726                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1727                                 == NULL)
1728                                 {
1729                                 al=SSL_AD_DECODE_ERROR;
1730                                 goto f_err;
1731                                 }
1732                         kn=EVP_PKEY_size(pkey);
1733                         }
1734                 else
1735                         {
1736                         pkey=NULL;
1737                         kn=0;
1738                         }
1739
1740                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1741                         {
1742                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1743                         goto err;
1744                         }
1745                 d=(unsigned char *)s->init_buf->data;
1746                 p= &(d[4]);
1747
1748                 for (i=0; r[i] != NULL; i++)
1749                         {
1750                         s2n(nr[i],p);
1751                         BN_bn2bin(r[i],p);
1752                         p+=nr[i];
1753                         }
1754
1755 #ifndef OPENSSL_NO_ECDH
1756                 if (type & SSL_kEECDH)
1757                         {
1758                         /* XXX: For now, we only support named (not generic) curves.
1759                          * In this situation, the serverKeyExchange message has:
1760                          * [1 byte CurveType], [2 byte CurveName]
1761                          * [1 byte length of encoded point], followed by
1762                          * the actual encoded point itself
1763                          */
1764                         *p = NAMED_CURVE_TYPE;
1765                         p += 1;
1766                         *p = 0;
1767                         p += 1;
1768                         *p = curve_id;
1769                         p += 1;
1770                         *p = encodedlen;
1771                         p += 1;
1772                         memcpy((unsigned char*)p,
1773                             (unsigned char *)encodedPoint,
1774                             encodedlen);
1775                         OPENSSL_free(encodedPoint);
1776                         p += encodedlen;
1777                         }
1778 #endif
1779
1780 #ifndef OPENSSL_NO_PSK
1781                 if (type & SSL_kPSK)
1782                         {
1783                         /* copy PSK identity hint */
1784                         s2n(strlen(s->ctx->psk_identity_hint), p);
1785                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1786                         p+=strlen(s->ctx->psk_identity_hint);
1787                         }
1788 #endif
1789
1790                 /* not anonymous */
1791                 if (pkey != NULL)
1792                         {
1793                         /* n is the length of the params, they start at &(d[4])
1794                          * and p points to the space at the end. */
1795 #ifndef OPENSSL_NO_RSA
1796                         if (pkey->type == EVP_PKEY_RSA)
1797                                 {
1798                                 q=md_buf;
1799                                 j=0;
1800                                 for (num=2; num > 0; num--)
1801                                         {
1802                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1803                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1804                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1805                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1806                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1807                                         EVP_DigestFinal_ex(&md_ctx,q,
1808                                                 (unsigned int *)&i);
1809                                         q+=i;
1810                                         j+=i;
1811                                         }
1812                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1813                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1814                                         {
1815                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1816                                         goto err;
1817                                         }
1818                                 s2n(u,p);
1819                                 n+=u+2;
1820                                 }
1821                         else
1822 #endif
1823 #if !defined(OPENSSL_NO_DSA)
1824                                 if (pkey->type == EVP_PKEY_DSA)
1825                                 {
1826                                 /* lets do DSS */
1827                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1828                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1829                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1830                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1831                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1832                                         (unsigned int *)&i,pkey))
1833                                         {
1834                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1835                                         goto err;
1836                                         }
1837                                 s2n(i,p);
1838                                 n+=i+2;
1839                                 }
1840                         else
1841 #endif
1842 #if !defined(OPENSSL_NO_ECDSA)
1843                                 if (pkey->type == EVP_PKEY_EC)
1844                                 {
1845                                 /* let's do ECDSA */
1846                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1847                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1848                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1849                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1850                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1851                                         (unsigned int *)&i,pkey))
1852                                         {
1853                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1854                                         goto err;
1855                                         }
1856                                 s2n(i,p);
1857                                 n+=i+2;
1858                                 }
1859                         else
1860 #endif
1861                                 {
1862                                 /* Is this error check actually needed? */
1863                                 al=SSL_AD_HANDSHAKE_FAILURE;
1864                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1865                                 goto f_err;
1866                                 }
1867                         }
1868
1869                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1870                 l2n3(n,d);
1871
1872                 /* we should now have things packed up, so lets send
1873                  * it off */
1874                 s->init_num=n+4;
1875                 s->init_off=0;
1876                 }
1877
1878         s->state = SSL3_ST_SW_KEY_EXCH_B;
1879         EVP_MD_CTX_cleanup(&md_ctx);
1880         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1881 f_err:
1882         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1883 err:
1884 #ifndef OPENSSL_NO_ECDH
1885         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1886         BN_CTX_free(bn_ctx);
1887 #endif
1888         EVP_MD_CTX_cleanup(&md_ctx);
1889         return(-1);
1890         }
1891
1892 int ssl3_send_certificate_request(SSL *s)
1893         {
1894         unsigned char *p,*d;
1895         int i,j,nl,off,n;
1896         STACK_OF(X509_NAME) *sk=NULL;
1897         X509_NAME *name;
1898         BUF_MEM *buf;
1899
1900         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1901                 {
1902                 buf=s->init_buf;
1903
1904                 d=p=(unsigned char *)&(buf->data[4]);
1905
1906                 /* get the list of acceptable cert types */
1907                 p++;
1908                 n=ssl3_get_req_cert_type(s,p);
1909                 d[0]=n;
1910                 p+=n;
1911                 n++;
1912
1913                 off=n;
1914                 p+=2;
1915                 n+=2;
1916
1917                 sk=SSL_get_client_CA_list(s);
1918                 nl=0;
1919                 if (sk != NULL)
1920                         {
1921                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1922                                 {
1923                                 name=sk_X509_NAME_value(sk,i);
1924                                 j=i2d_X509_NAME(name,NULL);
1925                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1926                                         {
1927                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1928                                         goto err;
1929                                         }
1930                                 p=(unsigned char *)&(buf->data[4+n]);
1931                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1932                                         {
1933                                         s2n(j,p);
1934                                         i2d_X509_NAME(name,&p);
1935                                         n+=2+j;
1936                                         nl+=2+j;
1937                                         }
1938                                 else
1939                                         {
1940                                         d=p;
1941                                         i2d_X509_NAME(name,&p);
1942                                         j-=2; s2n(j,d); j+=2;
1943                                         n+=j;
1944                                         nl+=j;
1945                                         }
1946                                 }
1947                         }
1948                 /* else no CA names */
1949                 p=(unsigned char *)&(buf->data[4+off]);
1950                 s2n(nl,p);
1951
1952                 d=(unsigned char *)buf->data;
1953                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1954                 l2n3(n,d);
1955
1956                 /* we should now have things packed up, so lets send
1957                  * it off */
1958
1959                 s->init_num=n+4;
1960                 s->init_off=0;
1961 #ifdef NETSCAPE_HANG_BUG
1962                 p=(unsigned char *)s->init_buf->data + s->init_num;
1963
1964                 /* do the header */
1965                 *(p++)=SSL3_MT_SERVER_DONE;
1966                 *(p++)=0;
1967                 *(p++)=0;
1968                 *(p++)=0;
1969                 s->init_num += 4;
1970 #endif
1971
1972                 s->state = SSL3_ST_SW_CERT_REQ_B;
1973                 }
1974
1975         /* SSL3_ST_SW_CERT_REQ_B */
1976         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1977 err:
1978         return(-1);
1979         }
1980
1981 int ssl3_get_client_key_exchange(SSL *s)
1982         {
1983         int i,al,ok;
1984         long n;
1985         unsigned long alg_k;
1986         unsigned char *p;
1987 #ifndef OPENSSL_NO_RSA
1988         RSA *rsa=NULL;
1989         EVP_PKEY *pkey=NULL;
1990 #endif
1991 #ifndef OPENSSL_NO_DH
1992         BIGNUM *pub=NULL;
1993         DH *dh_srvr;
1994 #endif
1995 #ifndef OPENSSL_NO_KRB5
1996         KSSL_ERR kssl_err;
1997 #endif /* OPENSSL_NO_KRB5 */
1998
1999 #ifndef OPENSSL_NO_ECDH
2000         EC_KEY *srvr_ecdh = NULL;
2001         EVP_PKEY *clnt_pub_pkey = NULL;
2002         EC_POINT *clnt_ecpoint = NULL;
2003         BN_CTX *bn_ctx = NULL;
2004 #endif
2005
2006         n=s->method->ssl_get_message(s,
2007                 SSL3_ST_SR_KEY_EXCH_A,
2008                 SSL3_ST_SR_KEY_EXCH_B,
2009                 SSL3_MT_CLIENT_KEY_EXCHANGE,
2010                 2048, /* ??? */
2011                 &ok);
2012
2013         if (!ok) return((int)n);
2014         p=(unsigned char *)s->init_msg;
2015
2016         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2017
2018 #ifndef OPENSSL_NO_RSA
2019         if (alg_k & SSL_kRSA)
2020                 {
2021                 /* FIX THIS UP EAY EAY EAY EAY */
2022                 if (s->s3->tmp.use_rsa_tmp)
2023                         {
2024                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
2025                                 rsa=s->cert->rsa_tmp;
2026                         /* Don't do a callback because rsa_tmp should
2027                          * be sent already */
2028                         if (rsa == NULL)
2029                                 {
2030                                 al=SSL_AD_HANDSHAKE_FAILURE;
2031                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
2032                                 goto f_err;
2033
2034                                 }
2035                         }
2036                 else
2037                         {
2038                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
2039                         if (    (pkey == NULL) ||
2040                                 (pkey->type != EVP_PKEY_RSA) ||
2041                                 (pkey->pkey.rsa == NULL))
2042                                 {
2043                                 al=SSL_AD_HANDSHAKE_FAILURE;
2044                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2045                                 goto f_err;
2046                                 }
2047                         rsa=pkey->pkey.rsa;
2048                         }
2049
2050                 /* TLS and [incidentally] DTLS{0xFEFF} */
2051                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2052                         {
2053                         n2s(p,i);
2054                         if (n != i+2)
2055                                 {
2056                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2057                                         {
2058                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2059                                         goto err;
2060                                         }
2061                                 else
2062                                         p-=2;
2063                                 }
2064                         else
2065                                 n=i;
2066                         }
2067
2068                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2069
2070                 al = -1;
2071
2072                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2073                         {
2074                         al=SSL_AD_DECODE_ERROR;
2075                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2076                         }
2077
2078                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2079                         {
2080                         /* The premaster secret must contain the same version number as the
2081                          * ClientHello to detect version rollback attacks (strangely, the
2082                          * protocol does not offer such protection for DH ciphersuites).
2083                          * However, buggy clients exist that send the negotiated protocol
2084                          * version instead if the server does not support the requested
2085                          * protocol version.
2086                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2087                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2088                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2089                                 {
2090                                 al=SSL_AD_DECODE_ERROR;
2091                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2092
2093                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2094                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2095                                  * number check as a "bad version oracle" -- an alert would
2096                                  * reveal that the plaintext corresponding to some ciphertext
2097                                  * made up by the adversary is properly formatted except
2098                                  * that the version number is wrong.  To avoid such attacks,
2099                                  * we should treat this just like any other decryption error. */
2100                                 }
2101                         }
2102
2103                 if (al != -1)
2104                         {
2105                         /* Some decryption failure -- use random value instead as countermeasure
2106                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2107                          * (see RFC 2246, section 7.4.7.1). */
2108                         ERR_clear_error();
2109                         i = SSL_MAX_MASTER_KEY_LENGTH;
2110                         p[0] = s->client_version >> 8;
2111                         p[1] = s->client_version & 0xff;
2112                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2113                                 goto err;
2114                         }
2115
2116                 s->session->master_key_length=
2117                         s->method->ssl3_enc->generate_master_secret(s,
2118                                 s->session->master_key,
2119                                 p,i);
2120                 OPENSSL_cleanse(p,i);
2121                 }
2122         else
2123 #endif
2124 #ifndef OPENSSL_NO_DH
2125                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2126                 {
2127                 n2s(p,i);
2128                 if (n != i+2)
2129                         {
2130                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2131                                 {
2132                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2133                                 goto err;
2134                                 }
2135                         else
2136                                 {
2137                                 p-=2;
2138                                 i=(int)n;
2139                                 }
2140                         }
2141
2142                 if (n == 0L) /* the parameters are in the cert */
2143                         {
2144                         al=SSL_AD_HANDSHAKE_FAILURE;
2145                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
2146                         goto f_err;
2147                         }
2148                 else
2149                         {
2150                         if (s->s3->tmp.dh == NULL)
2151                                 {
2152                                 al=SSL_AD_HANDSHAKE_FAILURE;
2153                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2154                                 goto f_err;
2155                                 }
2156                         else
2157                                 dh_srvr=s->s3->tmp.dh;
2158                         }
2159
2160                 pub=BN_bin2bn(p,i,NULL);
2161                 if (pub == NULL)
2162                         {
2163                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2164                         goto err;
2165                         }
2166
2167                 i=DH_compute_key(p,pub,dh_srvr);
2168
2169                 if (i <= 0)
2170                         {
2171                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2172                         goto err;
2173                         }
2174
2175                 DH_free(s->s3->tmp.dh);
2176                 s->s3->tmp.dh=NULL;
2177
2178                 BN_clear_free(pub);
2179                 pub=NULL;
2180                 s->session->master_key_length=
2181                         s->method->ssl3_enc->generate_master_secret(s,
2182                                 s->session->master_key,p,i);
2183                 OPENSSL_cleanse(p,i);
2184                 }
2185         else
2186 #endif
2187 #ifndef OPENSSL_NO_KRB5
2188         if (alg_k & SSL_kKRB5)
2189                 {
2190                 krb5_error_code         krb5rc;
2191                 krb5_data               enc_ticket;
2192                 krb5_data               authenticator;
2193                 krb5_data               enc_pms;
2194                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2195                 EVP_CIPHER_CTX          ciph_ctx;
2196                 const EVP_CIPHER        *enc = NULL;
2197                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2198                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2199                                                + EVP_MAX_BLOCK_LENGTH];
2200                 int                  padl, outl;
2201                 krb5_timestamp          authtime = 0;
2202                 krb5_ticket_times       ttimes;
2203
2204                 EVP_CIPHER_CTX_init(&ciph_ctx);
2205
2206                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2207
2208                 n2s(p,i);
2209                 enc_ticket.length = i;
2210
2211                 if (n < (long)(enc_ticket.length + 6))
2212                         {
2213                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2214                                 SSL_R_DATA_LENGTH_TOO_LONG);
2215                         goto err;
2216                         }
2217
2218                 enc_ticket.data = (char *)p;
2219                 p+=enc_ticket.length;
2220
2221                 n2s(p,i);
2222                 authenticator.length = i;
2223
2224                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2225                         {
2226                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2227                                 SSL_R_DATA_LENGTH_TOO_LONG);
2228                         goto err;
2229                         }
2230
2231                 authenticator.data = (char *)p;
2232                 p+=authenticator.length;
2233
2234                 n2s(p,i);
2235                 enc_pms.length = i;
2236                 enc_pms.data = (char *)p;
2237                 p+=enc_pms.length;
2238
2239                 /* Note that the length is checked again below,
2240                 ** after decryption
2241                 */
2242                 if(enc_pms.length > sizeof pms)
2243                         {
2244                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2245                                SSL_R_DATA_LENGTH_TOO_LONG);
2246                         goto err;
2247                         }
2248
2249                 if (n != (long)(enc_ticket.length + authenticator.length +
2250                                                 enc_pms.length + 6))
2251                         {
2252                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2253                                 SSL_R_DATA_LENGTH_TOO_LONG);
2254                         goto err;
2255                         }
2256
2257                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2258                                         &kssl_err)) != 0)
2259                         {
2260 #ifdef KSSL_DEBUG
2261                         printf("kssl_sget_tkt rtn %d [%d]\n",
2262                                 krb5rc, kssl_err.reason);
2263                         if (kssl_err.text)
2264                                 printf("kssl_err text= %s\n", kssl_err.text);
2265 #endif  /* KSSL_DEBUG */
2266                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2267                                 kssl_err.reason);
2268                         goto err;
2269                         }
2270
2271                 /*  Note: no authenticator is not considered an error,
2272                 **  but will return authtime == 0.
2273                 */
2274                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2275                                         &authtime, &kssl_err)) != 0)
2276                         {
2277 #ifdef KSSL_DEBUG
2278                         printf("kssl_check_authent rtn %d [%d]\n",
2279                                 krb5rc, kssl_err.reason);
2280                         if (kssl_err.text)
2281                                 printf("kssl_err text= %s\n", kssl_err.text);
2282 #endif  /* KSSL_DEBUG */
2283                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2284                                 kssl_err.reason);
2285                         goto err;
2286                         }
2287
2288                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2289                         {
2290                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2291                         goto err;
2292                         }
2293
2294 #ifdef KSSL_DEBUG
2295                 kssl_ctx_show(kssl_ctx);
2296 #endif  /* KSSL_DEBUG */
2297
2298                 enc = kssl_map_enc(kssl_ctx->enctype);
2299                 if (enc == NULL)
2300                     goto err;
2301
2302                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2303
2304                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2305                         {
2306                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2307                                 SSL_R_DECRYPTION_FAILED);
2308                         goto err;
2309                         }
2310                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2311                                         (unsigned char *)enc_pms.data, enc_pms.length))
2312                         {
2313                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2314                                 SSL_R_DECRYPTION_FAILED);
2315                         goto err;
2316                         }
2317                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2318                         {
2319                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2320                                 SSL_R_DATA_LENGTH_TOO_LONG);
2321                         goto err;
2322                         }
2323                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2324                         {
2325                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2326                                 SSL_R_DECRYPTION_FAILED);
2327                         goto err;
2328                         }
2329                 outl += padl;
2330                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2331                         {
2332                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2333                                 SSL_R_DATA_LENGTH_TOO_LONG);
2334                         goto err;
2335                         }
2336                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2337                     {
2338                     /* The premaster secret must contain the same version number as the
2339                      * ClientHello to detect version rollback attacks (strangely, the
2340                      * protocol does not offer such protection for DH ciphersuites).
2341                      * However, buggy clients exist that send random bytes instead of
2342                      * the protocol version.
2343                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2344                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2345                      */
2346                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2347                         {
2348                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2349                                SSL_AD_DECODE_ERROR);
2350                         goto err;
2351                         }
2352                     }
2353
2354                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2355
2356                 s->session->master_key_length=
2357                         s->method->ssl3_enc->generate_master_secret(s,
2358                                 s->session->master_key, pms, outl);
2359
2360                 if (kssl_ctx->client_princ)
2361                         {
2362                         size_t len = strlen(kssl_ctx->client_princ);
2363                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2364                                 {
2365                                 s->session->krb5_client_princ_len = len;
2366                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2367                                 }
2368                         }
2369
2370
2371                 /*  Was doing kssl_ctx_free() here,
2372                 **  but it caused problems for apache.
2373                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2374                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2375                 */
2376                 }
2377         else
2378 #endif  /* OPENSSL_NO_KRB5 */
2379
2380 #ifndef OPENSSL_NO_ECDH
2381                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2382                 {
2383                 int ret = 1;
2384                 int field_size = 0;
2385                 const EC_KEY   *tkey;
2386                 const EC_GROUP *group;
2387                 const BIGNUM *priv_key;
2388
2389                 /* initialize structures for server's ECDH key pair */
2390                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2391                         {
2392                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2393                             ERR_R_MALLOC_FAILURE);
2394                         goto err;
2395                         }
2396
2397                 /* Let's get server private key and group information */
2398                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2399                         {
2400                         /* use the certificate */
2401                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2402                         }
2403                 else
2404                         {
2405                         /* use the ephermeral values we saved when
2406                          * generating the ServerKeyExchange msg.
2407                          */
2408                         tkey = s->s3->tmp.ecdh;
2409                         }
2410
2411                 group    = EC_KEY_get0_group(tkey);
2412                 priv_key = EC_KEY_get0_private_key(tkey);
2413
2414                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2415                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2416                         {
2417                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2418                                ERR_R_EC_LIB);
2419                         goto err;
2420                         }
2421
2422                 /* Let's get client's public key */
2423                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2424                         {
2425                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2426                             ERR_R_MALLOC_FAILURE);
2427                         goto err;
2428                         }
2429
2430                 if (n == 0L)
2431                         {
2432                         /* Client Publickey was in Client Certificate */
2433
2434                          if (alg_k & SSL_kEECDH)
2435                                  {
2436                                  al=SSL_AD_HANDSHAKE_FAILURE;
2437                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2438                                  goto f_err;
2439                                  }
2440                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2441                             == NULL) ||
2442                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2443                                 {
2444                                 /* XXX: For now, we do not support client
2445                                  * authentication using ECDH certificates
2446                                  * so this branch (n == 0L) of the code is
2447                                  * never executed. When that support is
2448                                  * added, we ought to ensure the key
2449                                  * received in the certificate is
2450                                  * authorized for key agreement.
2451                                  * ECDH_compute_key implicitly checks that
2452                                  * the two ECDH shares are for the same
2453                                  * group.
2454                                  */
2455                                 al=SSL_AD_HANDSHAKE_FAILURE;
2456                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2457                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2458                                 goto f_err;
2459                                 }
2460
2461                         if (EC_POINT_copy(clnt_ecpoint,
2462                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2463                                 {
2464                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2465                                         ERR_R_EC_LIB);
2466                                 goto err;
2467                                 }
2468                         ret = 2; /* Skip certificate verify processing */
2469                         }
2470                 else
2471                         {
2472                         /* Get client's public key from encoded point
2473                          * in the ClientKeyExchange message.
2474                          */
2475                         if ((bn_ctx = BN_CTX_new()) == NULL)
2476                                 {
2477                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2478                                     ERR_R_MALLOC_FAILURE);
2479                                 goto err;
2480                                 }
2481
2482                         /* Get encoded point length */
2483                         i = *p;
2484                         p += 1;
2485                         if (EC_POINT_oct2point(group,
2486                             clnt_ecpoint, p, i, bn_ctx) == 0)
2487                                 {
2488                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2489                                     ERR_R_EC_LIB);
2490                                 goto err;
2491                                 }
2492                         /* p is pointing to somewhere in the buffer
2493                          * currently, so set it to the start
2494                          */
2495                         p=(unsigned char *)s->init_buf->data;
2496                         }
2497
2498                 /* Compute the shared pre-master secret */
2499                 field_size = EC_GROUP_get_degree(group);
2500                 if (field_size <= 0)
2501                         {
2502                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2503                                ERR_R_ECDH_LIB);
2504                         goto err;
2505                         }
2506                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2507                 if (i <= 0)
2508                         {
2509                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2510                             ERR_R_ECDH_LIB);
2511                         goto err;
2512                         }
2513
2514                 EVP_PKEY_free(clnt_pub_pkey);
2515                 EC_POINT_free(clnt_ecpoint);
2516                 EC_KEY_free(srvr_ecdh);
2517                 BN_CTX_free(bn_ctx);
2518                 EC_KEY_free(s->s3->tmp.ecdh);
2519                 s->s3->tmp.ecdh = NULL;
2520
2521                 /* Compute the master secret */
2522                 s->session->master_key_length = s->method->ssl3_enc-> \
2523                     generate_master_secret(s, s->session->master_key, p, i);
2524
2525                 OPENSSL_cleanse(p, i);
2526                 return (ret);
2527                 }
2528         else
2529 #endif
2530 #ifndef OPENSSL_NO_PSK
2531                 if (alg_k & SSL_kPSK)
2532                         {
2533                         unsigned char *t = NULL;
2534                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2535                         unsigned int pre_ms_len = 0, psk_len = 0;
2536                         int psk_err = 1;
2537                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2538
2539                         al=SSL_AD_HANDSHAKE_FAILURE;
2540
2541                         n2s(p,i);
2542                         if (n != i+2)
2543                                 {
2544                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2545                                         SSL_R_LENGTH_MISMATCH);
2546                                 goto psk_err;
2547                                 }
2548                         if (i > PSK_MAX_IDENTITY_LEN)
2549                                 {
2550                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2551                                         SSL_R_DATA_LENGTH_TOO_LONG);
2552                                 goto psk_err;
2553                                 }
2554                         if (s->psk_server_callback == NULL)
2555                                 {
2556                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2557                                        SSL_R_PSK_NO_SERVER_CB);
2558                                 goto psk_err;
2559                                 }
2560
2561                         /* Create guaranteed NULL-terminated identity
2562                          * string for the callback */
2563                         memcpy(tmp_id, p, i);
2564                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2565                         psk_len = s->psk_server_callback(s, tmp_id,
2566                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2567                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2568
2569                         if (psk_len > PSK_MAX_PSK_LEN)
2570                                 {
2571                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2572                                         ERR_R_INTERNAL_ERROR);
2573                                 goto psk_err;
2574                                 }
2575                         else if (psk_len == 0)
2576                                 {
2577                                 /* PSK related to the given identity not found */
2578                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2579                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2580                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2581                                 goto psk_err;
2582                                 }
2583
2584                         /* create PSK pre_master_secret */
2585                         pre_ms_len=2+psk_len+2+psk_len;
2586                         t = psk_or_pre_ms;
2587                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2588                         s2n(psk_len, t);
2589                         memset(t, 0, psk_len);
2590                         t+=psk_len;
2591                         s2n(psk_len, t);
2592
2593                         if (s->session->psk_identity != NULL)
2594                                 OPENSSL_free(s->session->psk_identity);
2595                         s->session->psk_identity = BUF_strdup((char *)p);
2596                         if (s->session->psk_identity == NULL)
2597                                 {
2598                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2599                                         ERR_R_MALLOC_FAILURE);
2600                                 goto psk_err;
2601                                 }
2602
2603                         if (s->session->psk_identity_hint != NULL)
2604                                 OPENSSL_free(s->session->psk_identity_hint);
2605                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2606                         if (s->ctx->psk_identity_hint != NULL &&
2607                                 s->session->psk_identity_hint == NULL)
2608                                 {
2609                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2610                                         ERR_R_MALLOC_FAILURE);
2611                                 goto psk_err;
2612                                 }
2613
2614                         s->session->master_key_length=
2615                                 s->method->ssl3_enc->generate_master_secret(s,
2616                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2617                         psk_err = 0;
2618                 psk_err:
2619                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2620                         if (psk_err != 0)
2621                                 goto f_err;
2622                         }
2623                 else
2624 #endif
2625                 if (alg_k & SSL_kGOST)
2626                         {
2627                         int ret = 0;
2628                         EVP_PKEY_CTX *pkey_ctx;
2629                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2630                         unsigned char premaster_secret[32], *start;
2631                         size_t outlen=32, inlen;
2632                         unsigned long alg_a;
2633
2634                         /* Get our certificate private key*/
2635                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2636                         if (alg_a & SSL_aGOST94)
2637                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2638                         else if (alg_a & SSL_aGOST01)
2639                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2640
2641                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2642                         EVP_PKEY_decrypt_init(pkey_ctx);
2643                         /* If client certificate is present and is of the same type, maybe
2644                          * use it for key exchange.  Don't mind errors from
2645                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2646                          * a client certificate for authorization only. */
2647                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2648                         if (client_pub_pkey)
2649                                 {
2650                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2651                                         ERR_clear_error();
2652                                 }
2653                         /* Decrypt session key */
2654                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED)))
2655                                 {
2656                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2657                                 goto gerr;
2658                                 }
2659                         if (p[1] == 0x81)
2660                                 {
2661                                 start = p+3;
2662                                 inlen = p[2];
2663                                 }
2664                         else if (p[1] < 0x80)
2665                                 {
2666                                 start = p+2;
2667                                 inlen = p[1];
2668                                 }
2669                         else
2670                                 {
2671                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2672                                 goto gerr;
2673                                 }
2674                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
2675
2676                                 {
2677                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2678                                 goto gerr;
2679                                 }
2680                         /* Generate master secret */
2681                         s->session->master_key_length=
2682                                 s->method->ssl3_enc->generate_master_secret(s,
2683                                         s->session->master_key,premaster_secret,32);
2684                         /* Check if pubkey from client certificate was used */
2685                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2686                                 ret = 2;
2687                         else
2688                                 ret = 1;
2689                 gerr:
2690                         EVP_PKEY_free(client_pub_pkey);
2691                         EVP_PKEY_CTX_free(pkey_ctx);
2692                         if (ret)
2693                                 return ret;
2694                         else
2695                                 goto err;
2696                         }
2697                 else
2698                 {
2699                 al=SSL_AD_HANDSHAKE_FAILURE;
2700                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2701                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2702                 goto f_err;
2703                 }
2704
2705         return(1);
2706 f_err:
2707         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2708 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2709 err:
2710 #endif
2711 #ifndef OPENSSL_NO_ECDH
2712         EVP_PKEY_free(clnt_pub_pkey);
2713         EC_POINT_free(clnt_ecpoint);
2714         if (srvr_ecdh != NULL)
2715                 EC_KEY_free(srvr_ecdh);
2716         BN_CTX_free(bn_ctx);
2717 #endif
2718         return(-1);
2719         }
2720
2721 int ssl3_get_cert_verify(SSL *s)
2722         {
2723         EVP_PKEY *pkey=NULL;
2724         unsigned char *p;
2725         int al,ok,ret=0;
2726         long n;
2727         int type=0,i,j;
2728         X509 *peer;
2729
2730         n=s->method->ssl_get_message(s,
2731                 SSL3_ST_SR_CERT_VRFY_A,
2732                 SSL3_ST_SR_CERT_VRFY_B,
2733                 -1,
2734                 514, /* 514? */
2735                 &ok);
2736
2737         if (!ok) return((int)n);
2738
2739         if (s->session->peer != NULL)
2740                 {
2741                 peer=s->session->peer;
2742                 pkey=X509_get_pubkey(peer);
2743                 type=X509_certificate_type(peer,pkey);
2744                 }
2745         else
2746                 {
2747                 peer=NULL;
2748                 pkey=NULL;
2749                 }
2750
2751         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2752                 {
2753                 s->s3->tmp.reuse_message=1;
2754                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2755                         {
2756                         al=SSL_AD_UNEXPECTED_MESSAGE;
2757                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2758                         goto f_err;
2759                         }
2760                 ret=1;
2761                 goto end;
2762                 }
2763
2764         if (peer == NULL)
2765                 {
2766                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2767                 al=SSL_AD_UNEXPECTED_MESSAGE;
2768                 goto f_err;
2769                 }
2770
2771         if (!(type & EVP_PKT_SIGN))
2772                 {
2773                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2774                 al=SSL_AD_ILLEGAL_PARAMETER;
2775                 goto f_err;
2776                 }
2777
2778         if (s->s3->change_cipher_spec)
2779                 {
2780                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2781                 al=SSL_AD_UNEXPECTED_MESSAGE;
2782                 goto f_err;
2783                 }
2784
2785         /* we now have a signature that we need to verify */
2786         p=(unsigned char *)s->init_msg;
2787         /* Check for broken implementations of GOST ciphersuites */
2788         /* If key is GOST and n is exactly 64, it is bare
2789          * signature without length field */
2790         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
2791                 pkey->type == NID_id_GostR3410_2001) )
2792                 {
2793                 i=64;
2794                 }
2795         else
2796                 {
2797                 n2s(p,i);
2798                 n-=2;
2799                 if (i > n)
2800                         {
2801                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2802                         al=SSL_AD_DECODE_ERROR;
2803                         goto f_err;
2804                         }
2805         }
2806         j=EVP_PKEY_size(pkey);
2807         if ((i > j) || (n > j) || (n <= 0))
2808                 {
2809                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2810                 al=SSL_AD_DECODE_ERROR;
2811                 goto f_err;
2812                 }
2813
2814 #ifndef OPENSSL_NO_RSA
2815         if (pkey->type == EVP_PKEY_RSA)
2816                 {
2817                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2818                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
2819                                                         pkey->pkey.rsa);
2820                 if (i < 0)
2821                         {
2822                         al=SSL_AD_DECRYPT_ERROR;
2823                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2824                         goto f_err;
2825                         }
2826                 if (i == 0)
2827                         {
2828                         al=SSL_AD_DECRYPT_ERROR;
2829                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2830                         goto f_err;
2831                         }
2832                 }
2833         else
2834 #endif
2835 #ifndef OPENSSL_NO_DSA
2836                 if (pkey->type == EVP_PKEY_DSA)
2837                 {
2838                 j=DSA_verify(pkey->save_type,
2839                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2840                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2841                 if (j <= 0)
2842                         {
2843                         /* bad signature */
2844                         al=SSL_AD_DECRYPT_ERROR;
2845                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2846                         goto f_err;
2847                         }
2848                 }
2849         else
2850 #endif
2851 #ifndef OPENSSL_NO_ECDSA
2852                 if (pkey->type == EVP_PKEY_EC)
2853                 {
2854                 j=ECDSA_verify(pkey->save_type,
2855                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2856                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2857                 if (j <= 0)
2858                         {
2859                         /* bad signature */
2860                         al=SSL_AD_DECRYPT_ERROR;
2861                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2862                             SSL_R_BAD_ECDSA_SIGNATURE);
2863                         goto f_err;
2864                         }
2865                 }
2866         else
2867 #endif
2868         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2869                 {   unsigned char signature[64];
2870                         int idx;
2871                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
2872                         EVP_PKEY_verify_init(pctx);
2873                         if (i!=64) {
2874                                 fprintf(stderr,"GOST signature length is %d",i);
2875                         }
2876                         for (idx=0;idx<64;idx++) {
2877                                 signature[63-idx]=p[idx];
2878                         }
2879                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
2880                         EVP_PKEY_CTX_free(pctx);
2881                         if (j<=0)
2882                                 {
2883                                 al=SSL_AD_DECRYPT_ERROR;
2884                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2885                                         SSL_R_BAD_ECDSA_SIGNATURE);
2886                                 goto f_err;
2887                                 }
2888                 }
2889         else
2890                 {
2891                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2892                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2893                 goto f_err;
2894                 }
2895
2896
2897         ret=1;
2898         if (0)
2899                 {
2900 f_err:
2901                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2902                 }
2903 end:
2904         EVP_PKEY_free(pkey);
2905         return(ret);
2906         }
2907
2908 int ssl3_get_client_certificate(SSL *s)
2909         {
2910         int i,ok,al,ret= -1;
2911         X509 *x=NULL;
2912         unsigned long l,nc,llen,n;
2913         const unsigned char *p,*q;
2914         unsigned char *d;
2915         STACK_OF(X509) *sk=NULL;
2916
2917         n=s->method->ssl_get_message(s,
2918                 SSL3_ST_SR_CERT_A,
2919                 SSL3_ST_SR_CERT_B,
2920                 -1,
2921                 s->max_cert_list,
2922                 &ok);
2923
2924         if (!ok) return((int)n);
2925
2926         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2927                 {
2928                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2929                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2930                         {
2931                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2932                         al=SSL_AD_HANDSHAKE_FAILURE;
2933                         goto f_err;
2934                         }
2935                 /* If tls asked for a client cert, the client must return a 0 list */
2936                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2937                         {
2938                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2939                         al=SSL_AD_UNEXPECTED_MESSAGE;
2940                         goto f_err;
2941                         }
2942                 s->s3->tmp.reuse_message=1;
2943                 return(1);
2944                 }
2945
2946         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2947                 {
2948                 al=SSL_AD_UNEXPECTED_MESSAGE;
2949                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2950                 goto f_err;
2951                 }
2952         p=d=(unsigned char *)s->init_msg;
2953
2954         if ((sk=sk_X509_new_null()) == NULL)
2955                 {
2956                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2957                 goto err;
2958                 }
2959
2960         n2l3(p,llen);
2961         if (llen+3 != n)
2962                 {
2963                 al=SSL_AD_DECODE_ERROR;
2964                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2965                 goto f_err;
2966                 }
2967         for (nc=0; nc<llen; )
2968                 {
2969                 n2l3(p,l);
2970                 if ((l+nc+3) > llen)
2971                         {
2972                         al=SSL_AD_DECODE_ERROR;
2973                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2974                         goto f_err;
2975                         }
2976
2977                 q=p;
2978                 x=d2i_X509(NULL,&p,l);
2979                 if (x == NULL)
2980                         {
2981                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2982                         goto err;
2983                         }
2984                 if (p != (q+l))
2985                         {
2986                         al=SSL_AD_DECODE_ERROR;
2987                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2988                         goto f_err;
2989                         }
2990                 if (!sk_X509_push(sk,x))
2991                         {
2992                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2993                         goto err;
2994                         }
2995                 x=NULL;
2996                 nc+=l+3;
2997                 }
2998
2999         if (sk_X509_num(sk) <= 0)
3000                 {
3001                 /* TLS does not mind 0 certs returned */
3002                 if (s->version == SSL3_VERSION)
3003                         {
3004                         al=SSL_AD_HANDSHAKE_FAILURE;
3005                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
3006                         goto f_err;
3007                         }
3008                 /* Fail for TLS only if we required a certificate */
3009                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
3010                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
3011                         {
3012                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
3013                         al=SSL_AD_HANDSHAKE_FAILURE;
3014                         goto f_err;
3015                         }
3016                 }
3017         else
3018                 {
3019                 i=ssl_verify_cert_chain(s,sk);
3020                 if (i <= 0)
3021                         {
3022                         al=ssl_verify_alarm_type(s->verify_result);
3023                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
3024                         goto f_err;
3025                         }
3026                 }
3027
3028         if (s->session->peer != NULL) /* This should not be needed */
3029                 X509_free(s->session->peer);
3030         s->session->peer=sk_X509_shift(sk);
3031         s->session->verify_result = s->verify_result;
3032
3033         /* With the current implementation, sess_cert will always be NULL
3034          * when we arrive here. */
3035         if (s->session->sess_cert == NULL)
3036                 {
3037                 s->session->sess_cert = ssl_sess_cert_new();
3038                 if (s->session->sess_cert == NULL)
3039                         {
3040                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
3041                         goto err;
3042                         }
3043                 }
3044         if (s->session->sess_cert->cert_chain != NULL)
3045                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3046         s->session->sess_cert->cert_chain=sk;
3047         /* Inconsistency alert: cert_chain does *not* include the
3048          * peer's own certificate, while we do include it in s3_clnt.c */
3049
3050         sk=NULL;
3051
3052         ret=1;
3053         if (0)
3054                 {
3055 f_err:
3056                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3057                 }
3058 err:
3059         if (x != NULL) X509_free(x);
3060         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3061         return(ret);
3062         }
3063
3064 int ssl3_send_server_certificate(SSL *s)
3065         {
3066         unsigned long l;
3067         X509 *x;
3068
3069         if (s->state == SSL3_ST_SW_CERT_A)
3070                 {
3071                 x=ssl_get_server_send_cert(s);
3072                 if (x == NULL)
3073                         {
3074                         /* VRS: allow null cert if auth == KRB5 */
3075                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3076                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3077                                 {
3078                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3079                                 return(0);
3080                                 }
3081                         }
3082
3083                 l=ssl3_output_cert_chain(s,x);
3084                 s->state=SSL3_ST_SW_CERT_B;
3085                 s->init_num=(int)l;
3086                 s->init_off=0;
3087                 }
3088
3089         /* SSL3_ST_SW_CERT_B */
3090         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3091         }
3092 #ifndef OPENSSL_NO_TLSEXT
3093 int ssl3_send_newsession_ticket(SSL *s)
3094         {
3095         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3096                 {
3097                 unsigned char *p, *senc, *macstart;
3098                 int len, slen;
3099                 unsigned int hlen;
3100                 EVP_CIPHER_CTX ctx;
3101                 HMAC_CTX hctx;
3102                 SSL_CTX *tctx = s->initial_ctx;
3103                 unsigned char iv[EVP_MAX_IV_LENGTH];
3104                 unsigned char key_name[16];
3105
3106                 /* get session encoding length */
3107                 slen = i2d_SSL_SESSION(s->session, NULL);
3108                 /* Some length values are 16 bits, so forget it if session is
3109                  * too long
3110                  */
3111                 if (slen > 0xFF00)
3112                         return -1;
3113                 /* Grow buffer if need be: the length calculation is as
3114                  * follows 1 (size of message name) + 3 (message length
3115                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
3116                  * 16 (key name) + max_iv_len (iv length) +
3117                  * session_length + max_enc_block_size (max encrypted session
3118                  * length) + max_md_size (HMAC).
3119                  */
3120                 if (!BUF_MEM_grow(s->init_buf,
3121                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
3122                         EVP_MAX_MD_SIZE + slen))
3123                         return -1;
3124                 senc = OPENSSL_malloc(slen);
3125                 if (!senc)
3126                         return -1;
3127                 p = senc;
3128                 i2d_SSL_SESSION(s->session, &p);
3129
3130                 p=(unsigned char *)s->init_buf->data;
3131                 /* do the header */
3132                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
3133                 /* Skip message length for now */
3134                 p += 3;
3135                 EVP_CIPHER_CTX_init(&ctx);
3136                 HMAC_CTX_init(&hctx);
3137                 /* Initialize HMAC and cipher contexts. If callback present
3138                  * it does all the work otherwise use generated values
3139                  * from parent ctx.
3140                  */
3141                 if (tctx->tlsext_ticket_key_cb)
3142                         {
3143                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3144                                                          &hctx, 1) < 0)
3145                                 {
3146                                 OPENSSL_free(senc);
3147                                 return -1;
3148                                 }
3149                         }
3150                 else
3151                         {
3152                         RAND_pseudo_bytes(iv, 16);
3153                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3154                                         tctx->tlsext_tick_aes_key, iv);
3155                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3156                                         tlsext_tick_md(), NULL);
3157                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3158                         }
3159                 l2n(s->session->tlsext_tick_lifetime_hint, p);
3160                 /* Skip ticket length for now */
3161                 p += 2;
3162                 /* Output key name */
3163                 macstart = p;
3164                 memcpy(p, key_name, 16);
3165                 p += 16;
3166                 /* output IV */
3167                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3168                 p += EVP_CIPHER_CTX_iv_length(&ctx);
3169                 /* Encrypt session data */
3170                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3171                 p += len;
3172                 EVP_EncryptFinal(&ctx, p, &len);
3173                 p += len;
3174                 EVP_CIPHER_CTX_cleanup(&ctx);
3175
3176                 HMAC_Update(&hctx, macstart, p - macstart);
3177                 HMAC_Final(&hctx, p, &hlen);
3178                 HMAC_CTX_cleanup(&hctx);
3179
3180                 p += hlen;
3181                 /* Now write out lengths: p points to end of data written */
3182                 /* Total length */
3183                 len = p - (unsigned char *)s->init_buf->data;
3184                 p=(unsigned char *)s->init_buf->data + 1;
3185                 l2n3(len - 4, p); /* Message length */
3186                 p += 4;
3187                 s2n(len - 10, p);  /* Ticket length */
3188
3189                 /* number of bytes to write */
3190                 s->init_num= len;
3191                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3192                 s->init_off=0;
3193                 OPENSSL_free(senc);
3194                 }
3195
3196         /* SSL3_ST_SW_SESSION_TICKET_B */
3197         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3198         }
3199
3200 int ssl3_send_cert_status(SSL *s)
3201         {
3202         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3203                 {
3204                 unsigned char *p;
3205                 /* Grow buffer if need be: the length calculation is as
3206                  * follows 1 (message type) + 3 (message length) +
3207                  * 1 (ocsp response type) + 3 (ocsp response length)
3208                  * + (ocsp response)
3209                  */
3210                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3211                         return -1;
3212
3213                 p=(unsigned char *)s->init_buf->data;
3214
3215                 /* do the header */
3216                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3217                 /* message length */
3218                 l2n3(s->tlsext_ocsp_resplen + 4, p);
3219                 /* status type */
3220                 *(p++)= s->tlsext_status_type;
3221                 /* length of OCSP response */
3222                 l2n3(s->tlsext_ocsp_resplen, p);
3223                 /* actual response */
3224                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3225                 /* number of bytes to write */
3226                 s->init_num = 8 + s->tlsext_ocsp_resplen;
3227                 s->state=SSL3_ST_SW_CERT_STATUS_B;
3228                 s->init_off = 0;
3229                 }
3230
3231         /* SSL3_ST_SW_CERT_STATUS_B */
3232         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3233         }
3234
3235 # ifndef OPENSSL_NO_NPN
3236 /* ssl3_get_next_proto reads a Next Protocol Negotiation handshake message. It
3237  * sets the next_proto member in s if found */
3238 int ssl3_get_next_proto(SSL *s)
3239         {
3240         int ok;
3241         int proto_len, padding_len;
3242         long n;
3243         const unsigned char *p;
3244
3245         /* Clients cannot send a NextProtocol message if we didn't see the
3246          * extension in their ClientHello */
3247         if (!s->s3->next_proto_neg_seen)
3248                 {
3249                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_WITHOUT_EXTENSION);
3250                 return -1;
3251                 }
3252
3253         n=s->method->ssl_get_message(s,
3254                 SSL3_ST_SR_NEXT_PROTO_A,
3255                 SSL3_ST_SR_NEXT_PROTO_B,
3256                 SSL3_MT_NEXT_PROTO,
3257                 514,  /* See the payload format below */
3258                 &ok);
3259
3260         if (!ok)
3261                 return((int)n);
3262
3263         /* s->state doesn't reflect whether ChangeCipherSpec has been received
3264          * in this handshake, but s->s3->change_cipher_spec does (will be reset
3265          * by ssl3_get_finished). */
3266         if (!s->s3->change_cipher_spec)
3267                 {
3268                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,SSL_R_GOT_NEXT_PROTO_BEFORE_A_CCS);
3269                 return -1;
3270                 }
3271
3272         if (n < 2)
3273                 return 0;  /* The body must be > 1 bytes long */
3274
3275         p=(unsigned char *)s->init_msg;
3276
3277         /* The payload looks like:
3278          *   uint8 proto_len;
3279          *   uint8 proto[proto_len];
3280          *   uint8 padding_len;
3281          *   uint8 padding[padding_len];
3282          */
3283         proto_len = p[0];
3284         if (proto_len + 2 > s->init_num)
3285                 return 0;
3286         padding_len = p[proto_len + 1];
3287         if (proto_len + padding_len + 2 != s->init_num)
3288                 return 0;
3289
3290         s->next_proto_negotiated = OPENSSL_malloc(proto_len);
3291         if (!s->next_proto_negotiated)
3292                 {
3293                 SSLerr(SSL_F_SSL3_GET_NEXT_PROTO,ERR_R_MALLOC_FAILURE);
3294                 return 0;
3295                 }
3296         memcpy(s->next_proto_negotiated, p + 1, proto_len);
3297         s->next_proto_negotiated_len = proto_len;
3298
3299         return 1;
3300         }
3301 # endif
3302 #endif