crypto/openssl/ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c -*- mode:C; c-file-style: "eay" -*- */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2007 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124 /* ====================================================================
 125  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 133  * support (see RFC 4279) to OpenSSL.
 134  *
 135  * No patent licenses or other rights except those expressly stated in
 136  * the OpenSSL open source license shall be deemed granted or received
 137  * expressly, by implication, estoppel, or otherwise.
 138  *
 139  * No assurances are provided by Nokia that the Contribution does not
 140  * infringe the patent or other intellectual property rights of any third
 141  * party or that the license provides you with all the necessary rights
 142  * to make use of the Contribution.
 143  *
 144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 148  * OTHERWISE.
 149  */
 150
 151 #define REUSE_CIPHER_BUG
 152 #define NETSCAPE_HANG_BUG
 153
 154 #include <stdio.h>
 155 #include "ssl_locl.h"
 156 #include "kssl_lcl.h"
 157 #include <openssl/buffer.h>
 158 #include <openssl/rand.h>
 159 #include <openssl/objects.h>
 160 #include <openssl/evp.h>
 161 #include <openssl/hmac.h>
 162 #include <openssl/x509.h>
 163 #ifndef OPENSSL_NO_DH
 164 #include <openssl/dh.h>
 165 #endif
 166 #include <openssl/bn.h>
 167 #ifndef OPENSSL_NO_KRB5
 168 #include <openssl/krb5_asn.h>
 169 #endif
 170 #include <openssl/md5.h>
 171
 172 static const SSL_METHOD *ssl3_get_server_method(int ver);
 173
 174 static const SSL_METHOD *ssl3_get_server_method(int ver)
 175         {
 176         if (ver == SSL3_VERSION)
 177                 return(SSLv3_server_method());
 178         else
 179                 return(NULL);
 180         }
 181
 182 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->new_session=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->new_session = 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                                 s->state=SSL3_ST_SR_FINISHED_A;
 542                                 s->init_num = 0;
 543                                 }
 544                         else
 545                                 {
 546                                 int offset=0;
 547                                 int dgst_num;
 548
 549                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 550                                 s->init_num=0;
 551
 552                                 /* We need to get hashes here so if there is
 553                                  * a client cert, it can be verified
 554                                  * FIXME - digest processing for CertificateVerify
 555                                  * should be generalized. But it is next step
 556                                  */
 557                                 if (s->s3->handshake_buffer)
 558                                         if (!ssl3_digest_cached_records(s))
 559                                                 return -1;
 560                                 for (dgst_num=0; dgst_num<SSL_MAX_DIGEST;dgst_num++)
 561                                         if (s->s3->handshake_dgst[dgst_num])
 562                                                 {
 563                                                 int dgst_size;
 564
 565                                                 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]));
 566                                                 dgst_size=EVP_MD_CTX_size(s->s3->handshake_dgst[dgst_num]);
 567                                                 if (dgst_size < 0)
 568                                                         {
 569                                                         ret = -1;
 570                                                         goto end;
 571                                                         }
 572                                                 offset+=dgst_size;
 573                                                 }
 574                                 }
 575                         break;
 576
 577                 case SSL3_ST_SR_CERT_VRFY_A:
 578                 case SSL3_ST_SR_CERT_VRFY_B:
 579
 580                         /* we should decide if we expected this one */
 581                         ret=ssl3_get_cert_verify(s);
 582                         if (ret <= 0) goto end;
 583
 584                         s->state=SSL3_ST_SR_FINISHED_A;
 585                         s->init_num=0;
 586                         break;
 587
 588                 case SSL3_ST_SR_FINISHED_A:
 589                 case SSL3_ST_SR_FINISHED_B:
 590                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 591                                 SSL3_ST_SR_FINISHED_B);
 592                         if (ret <= 0) goto end;
 593 #ifndef OPENSSL_NO_TLSEXT
 594                         if (s->tlsext_ticket_expected)
 595                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 596                         else if (s->hit)
 597                                 s->state=SSL_ST_OK;
 598 #else
 599                         if (s->hit)
 600                                 s->state=SSL_ST_OK;
 601 #endif
 602                         else
 603                                 s->state=SSL3_ST_SW_CHANGE_A;
 604                         s->init_num=0;
 605                         break;
 606
 607 #ifndef OPENSSL_NO_TLSEXT
 608                 case SSL3_ST_SW_SESSION_TICKET_A:
 609                 case SSL3_ST_SW_SESSION_TICKET_B:
 610                         ret=ssl3_send_newsession_ticket(s);
 611                         if (ret <= 0) goto end;
 612                         s->state=SSL3_ST_SW_CHANGE_A;
 613                         s->init_num=0;
 614                         break;
 615
 616                 case SSL3_ST_SW_CERT_STATUS_A:
 617                 case SSL3_ST_SW_CERT_STATUS_B:
 618                         ret=ssl3_send_cert_status(s);
 619                         if (ret <= 0) goto end;
 620                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 621                         s->init_num=0;
 622                         break;
 623
 624 #endif
 625
 626                 case SSL3_ST_SW_CHANGE_A:
 627                 case SSL3_ST_SW_CHANGE_B:
 628
 629                         s->session->cipher=s->s3->tmp.new_cipher;
 630                         if (!s->method->ssl3_enc->setup_key_block(s))
 631                                 { ret= -1; goto end; }
 632
 633                         ret=ssl3_send_change_cipher_spec(s,
 634                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 635
 636                         if (ret <= 0) goto end;
 637                         s->state=SSL3_ST_SW_FINISHED_A;
 638                         s->init_num=0;
 639
 640                         if (!s->method->ssl3_enc->change_cipher_state(s,
 641                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 642                                 {
 643                                 ret= -1;
 644                                 goto end;
 645                                 }
 646
 647                         break;
 648
 649                 case SSL3_ST_SW_FINISHED_A:
 650                 case SSL3_ST_SW_FINISHED_B:
 651                         ret=ssl3_send_finished(s,
 652                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 653                                 s->method->ssl3_enc->server_finished_label,
 654                                 s->method->ssl3_enc->server_finished_label_len);
 655                         if (ret <= 0) goto end;
 656                         s->state=SSL3_ST_SW_FLUSH;
 657                         if (s->hit)
 658                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 659                         else
 660                                 s->s3->tmp.next_state=SSL_ST_OK;
 661                         s->init_num=0;
 662                         break;
 663
 664                 case SSL_ST_OK:
 665                         /* clean a few things up */
 666                         ssl3_cleanup_key_block(s);
 667
 668                         BUF_MEM_free(s->init_buf);
 669                         s->init_buf=NULL;
 670
 671                         /* remove buffering on output */
 672                         ssl_free_wbio_buffer(s);
 673
 674                         s->init_num=0;
 675
 676                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 677                                 {
 678                                 /* actually not necessarily a 'new' session unless
 679                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 680
 681                                 s->new_session=0;
 682
 683                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 684
 685                                 s->ctx->stats.sess_accept_good++;
 686                                 /* s->server=1; */
 687                                 s->handshake_func=ssl3_accept;
 688
 689                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 690                                 }
 691
 692                         ret = 1;
 693                         goto end;
 694                         /* break; */
 695
 696                 default:
 697                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 698                         ret= -1;
 699                         goto end;
 700                         /* break; */
 701                         }
 702
 703                 if (!s->s3->tmp.reuse_message && !skip)
 704                         {
 705                         if (s->debug)
 706                                 {
 707                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 708                                         goto end;
 709                                 }
 710
 711
 712                         if ((cb != NULL) && (s->state != state))
 713                                 {
 714                                 new_state=s->state;
 715                                 s->state=state;
 716                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 717                                 s->state=new_state;
 718                                 }
 719                         }
 720                 skip=0;
 721                 }
 722 end:
 723         /* BIO_flush(s->wbio); */
 724
 725         s->in_handshake--;
 726         if (cb != NULL)
 727                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 728         return(ret);
 729         }
 730
 731 int ssl3_send_hello_request(SSL *s)
 732         {
 733         unsigned char *p;
 734
 735         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 736                 {
 737                 p=(unsigned char *)s->init_buf->data;
 738                 *(p++)=SSL3_MT_HELLO_REQUEST;
 739                 *(p++)=0;
 740                 *(p++)=0;
 741                 *(p++)=0;
 742
 743                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 744                 /* number of bytes to write */
 745                 s->init_num=4;
 746                 s->init_off=0;
 747                 }
 748
 749         /* SSL3_ST_SW_HELLO_REQ_B */
 750         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 751         }
 752
 753 int ssl3_check_client_hello(SSL *s)
 754         {
 755         int ok;
 756         long n;
 757
 758         /* this function is called when we really expect a Certificate message,
 759          * so permit appropriate message length */
 760         n=s->method->ssl_get_message(s,
 761                 SSL3_ST_SR_CERT_A,
 762                 SSL3_ST_SR_CERT_B,
 763                 -1,
 764                 s->max_cert_list,
 765                 &ok);
 766         if (!ok) return((int)n);
 767         s->s3->tmp.reuse_message = 1;
 768         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 769                 {
 770                 /* Throw away what we have done so far in the current handshake,
 771                  * which will now be aborted. (A full SSL_clear would be too much.)
 772                  * I hope that tmp.dh is the only thing that may need to be cleared
 773                  * when a handshake is not completed ... */
 774 #ifndef OPENSSL_NO_DH
 775                 if (s->s3->tmp.dh != NULL)
 776                         {
 777                         DH_free(s->s3->tmp.dh);
 778                         s->s3->tmp.dh = NULL;
 779                         }
 780 #endif
 781                 return 2;
 782                 }
 783         return 1;
 784 }
 785
 786 int ssl3_get_client_hello(SSL *s)
 787         {
 788         int i,j,ok,al,ret= -1;
 789         unsigned int cookie_len;
 790         long n;
 791         unsigned long id;
 792         unsigned char *p,*d,*q;
 793         SSL_CIPHER *c;
 794 #ifndef OPENSSL_NO_COMP
 795         SSL_COMP *comp=NULL;
 796 #endif
 797         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 798
 799         /* We do this so that we will respond with our native type.
 800          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 801          * This down switching should be handled by a different method.
 802          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 803          * TLSv1.
 804          */
 805         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 806                 {
 807                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 808                 }
 809         s->first_packet=1;
 810         n=s->method->ssl_get_message(s,
 811                 SSL3_ST_SR_CLNT_HELLO_B,
 812                 SSL3_ST_SR_CLNT_HELLO_C,
 813                 SSL3_MT_CLIENT_HELLO,
 814                 SSL3_RT_MAX_PLAIN_LENGTH,
 815                 &ok);
 816
 817         if (!ok) return((int)n);
 818         s->first_packet=0;
 819         d=p=(unsigned char *)s->init_msg;
 820
 821         /* use version from inside client hello, not from record header
 822          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 823         s->client_version=(((int)p[0])<<8)|(int)p[1];
 824         p+=2;
 825
 826         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 827             (s->version != DTLS1_VERSION && s->client_version < s->version))
 828                 {
 829                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 830                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 831                         {
 832                         /* similar to ssl3_get_record, send alert using remote version number */
 833                         s->version = s->client_version;
 834                         }
 835                 al = SSL_AD_PROTOCOL_VERSION;
 836                 goto f_err;
 837                 }
 838
 839         /* If we require cookies and this ClientHello doesn't
 840          * contain one, just return since we do not want to
 841          * allocate any memory yet. So check cookie length...
 842          */
 843         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
 844                 {
 845                 unsigned int session_length, cookie_length;
 846
 847                 session_length = *(p + SSL3_RANDOM_SIZE);
 848                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
 849
 850                 if (cookie_length == 0)
 851                         return 1;
 852                 }
 853
 854         /* load the client random */
 855         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 856         p+=SSL3_RANDOM_SIZE;
 857
 858         /* get the session-id */
 859         j= *(p++);
 860
 861         s->hit=0;
 862         /* Versions before 0.9.7 always allow session reuse during renegotiation
 863          * (i.e. when s->new_session is true), option
 864          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
 865          * Maybe this optional behaviour should always have been the default,
 866          * but we cannot safely change the default behaviour (or new applications
 867          * might be written that become totally unsecure when compiled with
 868          * an earlier library version)
 869          */
 870         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 871                 {
 872                 if (!ssl_get_new_session(s,1))
 873                         goto err;
 874                 }
 875         else
 876                 {
 877                 i=ssl_get_prev_session(s, p, j, d + n);
 878                 if (i == 1)
 879                         { /* previous session */
 880                         s->hit=1;
 881                         }
 882                 else if (i == -1)
 883                         goto err;
 884                 else /* i == 0 */
 885                         {
 886                         if (!ssl_get_new_session(s,1))
 887                                 goto err;
 888                         }
 889                 }
 890
 891         p+=j;
 892
 893         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
 894                 {
 895                 /* cookie stuff */
 896                 cookie_len = *(p++);
 897
 898                 /*
 899                  * The ClientHello may contain a cookie even if the
 900                  * HelloVerify message has not been sent--make sure that it
 901                  * does not cause an overflow.
 902                  */
 903                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
 904                         {
 905                         /* too much data */
 906                         al = SSL_AD_DECODE_ERROR;
 907                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 908                         goto f_err;
 909                         }
 910
 911                 /* verify the cookie if appropriate option is set. */
 912                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 913                         cookie_len > 0)
 914                         {
 915                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
 916
 917                         if ( s->ctx->app_verify_cookie_cb != NULL)
 918                                 {
 919                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
 920                                         cookie_len) == 0)
 921                                         {
 922                                         al=SSL_AD_HANDSHAKE_FAILURE;
 923                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 924                                                 SSL_R_COOKIE_MISMATCH);
 925                                         goto f_err;
 926                                         }
 927                                 /* else cookie verification succeeded */
 928                                 }
 929                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
 930                                                   s->d1->cookie_len) != 0) /* default verification */
 931                                 {
 932                                         al=SSL_AD_HANDSHAKE_FAILURE;
 933                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 934                                                 SSL_R_COOKIE_MISMATCH);
 935                                         goto f_err;
 936                                 }
 937
 938                         ret = 2;
 939                         }
 940
 941                 p += cookie_len;
 942                 }
 943
 944         n2s(p,i);
 945         if ((i == 0) && (j != 0))
 946                 {
 947                 /* we need a cipher if we are not resuming a session */
 948                 al=SSL_AD_ILLEGAL_PARAMETER;
 949                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 950                 goto f_err;
 951                 }
 952         if ((p+i) >= (d+n))
 953                 {
 954                 /* not enough data */
 955                 al=SSL_AD_DECODE_ERROR;
 956                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 957                 goto f_err;
 958                 }
 959         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 960                 == NULL))
 961                 {
 962                 goto err;
 963                 }
 964         p+=i;
 965
 966         /* If it is a hit, check that the cipher is in the list */
 967         if ((s->hit) && (i > 0))
 968                 {
 969                 j=0;
 970                 id=s->session->cipher->id;
 971
 972 #ifdef CIPHER_DEBUG
 973                 printf("client sent %d ciphers\n",sk_num(ciphers));
 974 #endif
 975                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 976                         {
 977                         c=sk_SSL_CIPHER_value(ciphers,i);
 978 #ifdef CIPHER_DEBUG
 979                         printf("client [%2d of %2d]:%s\n",
 980                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 981 #endif
 982                         if (c->id == id)
 983                                 {
 984                                 j=1;
 985                                 break;
 986                                 }
 987                         }
 988 /* Disabled because it can be used in a ciphersuite downgrade
 989  * attack: CVE-2010-4180.
 990  */
 991 #if 0
 992                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 993                         {
 994                         /* Special case as client bug workaround: the previously used cipher may
 995                          * not be in the current list, the client instead might be trying to
 996                          * continue using a cipher that before wasn't chosen due to server
 997                          * preferences.  We'll have to reject the connection if the cipher is not
 998                          * enabled, though. */
 999                         c = sk_SSL_CIPHER_value(ciphers, 0);
1000                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
1001                                 {
1002                                 s->session->cipher = c;
1003                                 j = 1;
1004                                 }
1005                         }
1006 #endif
1007                 if (j == 0)
1008                         {
1009                         /* we need to have the cipher in the cipher
1010                          * list if we are asked to reuse it */
1011                         al=SSL_AD_ILLEGAL_PARAMETER;
1012                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
1013                         goto f_err;
1014                         }
1015                 }
1016
1017         /* compression */
1018         i= *(p++);
1019         if ((p+i) > (d+n))
1020                 {
1021                 /* not enough data */
1022                 al=SSL_AD_DECODE_ERROR;
1023                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1024                 goto f_err;
1025                 }
1026         q=p;
1027         for (j=0; j<i; j++)
1028                 {
1029                 if (p[j] == 0) break;
1030                 }
1031
1032         p+=i;
1033         if (j >= i)
1034                 {
1035                 /* no compress */
1036                 al=SSL_AD_DECODE_ERROR;
1037                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
1038                 goto f_err;
1039                 }
1040
1041 #ifndef OPENSSL_NO_TLSEXT
1042         /* TLS extensions*/
1043         if (s->version >= SSL3_VERSION)
1044                 {
1045                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
1046                         {
1047                         /* 'al' set by ssl_parse_clienthello_tlsext */
1048                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1049                         goto f_err;
1050                         }
1051                 }
1052                 if (ssl_check_clienthello_tlsext(s) <= 0) {
1053                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1054                         goto err;
1055                 }
1056
1057         /* Check if we want to use external pre-shared secret for this
1058          * handshake for not reused session only. We need to generate
1059          * server_random before calling tls_session_secret_cb in order to allow
1060          * SessionTicket processing to use it in key derivation. */
1061         {
1062                 unsigned long Time;
1063                 unsigned char *pos;
1064                 Time=(unsigned long)time(NULL);                 /* Time */
1065                 pos=s->s3->server_random;
1066                 l2n(Time,pos);
1067                 if (RAND_pseudo_bytes(pos,SSL3_RANDOM_SIZE-4) <= 0)
1068                         {
1069                         al=SSL_AD_INTERNAL_ERROR;
1070                         goto f_err;
1071                         }
1072         }
1073
1074         if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb)
1075                 {
1076                 SSL_CIPHER *pref_cipher=NULL;
1077
1078                 s->session->master_key_length=sizeof(s->session->master_key);
1079                 if(s->tls_session_secret_cb(s, s->session->master_key, &s->session->master_key_length,
1080                         ciphers, &pref_cipher, s->tls_session_secret_cb_arg))
1081                         {
1082                         s->hit=1;
1083                         s->session->ciphers=ciphers;
1084                         s->session->verify_result=X509_V_OK;
1085
1086                         ciphers=NULL;
1087
1088                         /* check if some cipher was preferred by call back */
1089                         pref_cipher=pref_cipher ? pref_cipher : ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
1090                         if (pref_cipher == NULL)
1091                                 {
1092                                 al=SSL_AD_HANDSHAKE_FAILURE;
1093                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1094                                 goto f_err;
1095                                 }
1096
1097                         s->session->cipher=pref_cipher;
1098
1099                         if (s->cipher_list)
1100                                 sk_SSL_CIPHER_free(s->cipher_list);
1101
1102                         if (s->cipher_list_by_id)
1103                                 sk_SSL_CIPHER_free(s->cipher_list_by_id);
1104
1105                         s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
1106                         s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
1107                         }
1108                 }
1109 #endif
1110
1111         /* Worst case, we will use the NULL compression, but if we have other
1112          * options, we will now look for them.  We have i-1 compression
1113          * algorithms from the client, starting at q. */
1114         s->s3->tmp.new_compression=NULL;
1115 #ifndef OPENSSL_NO_COMP
1116         /* This only happens if we have a cache hit */
1117         if (s->session->compress_meth != 0)
1118                 {
1119                 int m, comp_id = s->session->compress_meth;
1120                 /* Perform sanity checks on resumed compression algorithm */
1121                 /* Can't disable compression */
1122                 if (s->options & SSL_OP_NO_COMPRESSION)
1123                         {
1124                         al=SSL_AD_INTERNAL_ERROR;
1125                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1126                         goto f_err;
1127                         }
1128                 /* Look for resumed compression method */
1129                 for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++)
1130                         {
1131                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1132                         if (comp_id == comp->id)
1133                                 {
1134                                 s->s3->tmp.new_compression=comp;
1135                                 break;
1136                                 }
1137                         }
1138                 if (s->s3->tmp.new_compression == NULL)
1139                         {
1140                         al=SSL_AD_INTERNAL_ERROR;
1141                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INVALID_COMPRESSION_ALGORITHM);
1142                         goto f_err;
1143                         }
1144                 /* Look for resumed method in compression list */
1145                 for (m = 0; m < i; m++)
1146                         {
1147                         if (q[m] == comp_id)
1148                                 break;
1149                         }
1150                 if (m >= i)
1151                         {
1152                         al=SSL_AD_ILLEGAL_PARAMETER;
1153                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_COMPRESSSION_ALGORITHM_MISSING);
1154                         goto f_err;
1155                         }
1156                 }
1157         else if (s->hit)
1158                 comp = NULL;
1159         else if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
1160                 { /* See if we have a match */
1161                 int m,nn,o,v,done=0;
1162
1163                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1164                 for (m=0; m<nn; m++)
1165                         {
1166                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1167                         v=comp->id;
1168                         for (o=0; o<i; o++)
1169                                 {
1170                                 if (v == q[o])
1171                                         {
1172                                         done=1;
1173                                         break;
1174                                         }
1175                                 }
1176                         if (done) break;
1177                         }
1178                 if (done)
1179                         s->s3->tmp.new_compression=comp;
1180                 else
1181                         comp=NULL;
1182                 }
1183 #else
1184         /* If compression is disabled we'd better not try to resume a session
1185          * using compression.
1186          */
1187         if (s->session->compress_meth != 0)
1188                 {
1189                 al=SSL_AD_INTERNAL_ERROR;
1190                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1191                 goto f_err;
1192                 }
1193 #endif
1194
1195         /* Given s->session->ciphers and SSL_get_ciphers, we must
1196          * pick a cipher */
1197
1198         if (!s->hit)
1199                 {
1200 #ifdef OPENSSL_NO_COMP
1201                 s->session->compress_meth=0;
1202 #else
1203                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1204 #endif
1205                 if (s->session->ciphers != NULL)
1206                         sk_SSL_CIPHER_free(s->session->ciphers);
1207                 s->session->ciphers=ciphers;
1208                 if (ciphers == NULL)
1209                         {
1210                         al=SSL_AD_ILLEGAL_PARAMETER;
1211                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1212                         goto f_err;
1213                         }
1214                 ciphers=NULL;
1215                 c=ssl3_choose_cipher(s,s->session->ciphers,
1216                                      SSL_get_ciphers(s));
1217
1218                 if (c == NULL)
1219                         {
1220                         al=SSL_AD_HANDSHAKE_FAILURE;
1221                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1222                         goto f_err;
1223                         }
1224                 s->s3->tmp.new_cipher=c;
1225                 }
1226         else
1227                 {
1228                 /* Session-id reuse */
1229 #ifdef REUSE_CIPHER_BUG
1230                 STACK_OF(SSL_CIPHER) *sk;
1231                 SSL_CIPHER *nc=NULL;
1232                 SSL_CIPHER *ec=NULL;
1233
1234                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1235                         {
1236                         sk=s->session->ciphers;
1237                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1238                                 {
1239                                 c=sk_SSL_CIPHER_value(sk,i);
1240                                 if (c->algorithm_enc & SSL_eNULL)
1241                                         nc=c;
1242                                 if (SSL_C_IS_EXPORT(c))
1243                                         ec=c;
1244                                 }
1245                         if (nc != NULL)
1246                                 s->s3->tmp.new_cipher=nc;
1247                         else if (ec != NULL)
1248                                 s->s3->tmp.new_cipher=ec;
1249                         else
1250                                 s->s3->tmp.new_cipher=s->session->cipher;
1251                         }
1252                 else
1253 #endif
1254                 s->s3->tmp.new_cipher=s->session->cipher;
1255                 }
1256
1257         if (!ssl3_digest_cached_records(s))
1258                 goto f_err;
1259
1260         /* we now have the following setup.
1261          * client_random
1262          * cipher_list          - our prefered list of ciphers
1263          * ciphers              - the clients prefered list of ciphers
1264          * compression          - basically ignored right now
1265          * ssl version is set   - sslv3
1266          * s->session           - The ssl session has been setup.
1267          * s->hit               - session reuse flag
1268          * s->tmp.new_cipher    - the new cipher to use.
1269          */
1270
1271         if (ret < 0) ret=1;
1272         if (0)
1273                 {
1274 f_err:
1275                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1276                 }
1277 err:
1278         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1279         return(ret);
1280         }
1281
1282 int ssl3_send_server_hello(SSL *s)
1283         {
1284         unsigned char *buf;
1285         unsigned char *p,*d;
1286         int i,sl;
1287         unsigned long l;
1288 #ifdef OPENSSL_NO_TLSEXT
1289         unsigned long Time;
1290 #endif
1291
1292         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1293                 {
1294                 buf=(unsigned char *)s->init_buf->data;
1295 #ifdef OPENSSL_NO_TLSEXT
1296                 p=s->s3->server_random;
1297                 /* Generate server_random if it was not needed previously */
1298                 Time=(unsigned long)time(NULL);                 /* Time */
1299                 l2n(Time,p);
1300                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1301                         return -1;
1302 #endif
1303                 /* Do the message type and length last */
1304                 d=p= &(buf[4]);
1305
1306                 *(p++)=s->version>>8;
1307                 *(p++)=s->version&0xff;
1308
1309                 /* Random stuff */
1310                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1311                 p+=SSL3_RANDOM_SIZE;
1312
1313                 /* now in theory we have 3 options to sending back the
1314                  * session id.  If it is a re-use, we send back the
1315                  * old session-id, if it is a new session, we send
1316                  * back the new session-id or we send back a 0 length
1317                  * session-id if we want it to be single use.
1318                  * Currently I will not implement the '0' length session-id
1319                  * 12-Jan-98 - I'll now support the '0' length stuff.
1320                  *
1321                  * We also have an additional case where stateless session
1322                  * resumption is successful: we always send back the old
1323                  * session id. In this case s->hit is non zero: this can
1324                  * only happen if stateless session resumption is succesful
1325                  * if session caching is disabled so existing functionality
1326                  * is unaffected.
1327                  */
1328                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1329                         && !s->hit)
1330                         s->session->session_id_length=0;
1331
1332                 sl=s->session->session_id_length;
1333                 if (sl > (int)sizeof(s->session->session_id))
1334                         {
1335                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1336                         return -1;
1337                         }
1338                 *(p++)=sl;
1339                 memcpy(p,s->session->session_id,sl);
1340                 p+=sl;
1341
1342                 /* put the cipher */
1343                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1344                 p+=i;
1345
1346                 /* put the compression method */
1347 #ifdef OPENSSL_NO_COMP
1348                         *(p++)=0;
1349 #else
1350                 if (s->s3->tmp.new_compression == NULL)
1351                         *(p++)=0;
1352                 else
1353                         *(p++)=s->s3->tmp.new_compression->id;
1354 #endif
1355 #ifndef OPENSSL_NO_TLSEXT
1356                 if (ssl_prepare_serverhello_tlsext(s) <= 0)
1357                         {
1358                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1359                         return -1;
1360                         }
1361                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1362                         {
1363                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1364                         return -1;
1365                         }
1366 #endif
1367                 /* do the header */
1368                 l=(p-d);
1369                 d=buf;
1370                 *(d++)=SSL3_MT_SERVER_HELLO;
1371                 l2n3(l,d);
1372
1373                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1374                 /* number of bytes to write */
1375                 s->init_num=p-buf;
1376                 s->init_off=0;
1377                 }
1378
1379         /* SSL3_ST_SW_SRVR_HELLO_B */
1380         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1381         }
1382
1383 int ssl3_send_server_done(SSL *s)
1384         {
1385         unsigned char *p;
1386
1387         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1388                 {
1389                 p=(unsigned char *)s->init_buf->data;
1390
1391                 /* do the header */
1392                 *(p++)=SSL3_MT_SERVER_DONE;
1393                 *(p++)=0;
1394                 *(p++)=0;
1395                 *(p++)=0;
1396
1397                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1398                 /* number of bytes to write */
1399                 s->init_num=4;
1400                 s->init_off=0;
1401                 }
1402
1403         /* SSL3_ST_SW_SRVR_DONE_B */
1404         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1405         }
1406
1407 int ssl3_send_server_key_exchange(SSL *s)
1408         {
1409 #ifndef OPENSSL_NO_RSA
1410         unsigned char *q;
1411         int j,num;
1412         RSA *rsa;
1413         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1414         unsigned int u;
1415 #endif
1416 #ifndef OPENSSL_NO_DH
1417         DH *dh=NULL,*dhp;
1418 #endif
1419 #ifndef OPENSSL_NO_ECDH
1420         EC_KEY *ecdh=NULL, *ecdhp;
1421         unsigned char *encodedPoint = NULL;
1422         int encodedlen = 0;
1423         int curve_id = 0;
1424         BN_CTX *bn_ctx = NULL;
1425 #endif
1426         EVP_PKEY *pkey;
1427         unsigned char *p,*d;
1428         int al,i;
1429         unsigned long type;
1430         int n;
1431         CERT *cert;
1432         BIGNUM *r[4];
1433         int nr[4],kn;
1434         BUF_MEM *buf;
1435         EVP_MD_CTX md_ctx;
1436
1437         EVP_MD_CTX_init(&md_ctx);
1438         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1439                 {
1440                 type=s->s3->tmp.new_cipher->algorithm_mkey;
1441                 cert=s->cert;
1442
1443                 buf=s->init_buf;
1444
1445                 r[0]=r[1]=r[2]=r[3]=NULL;
1446                 n=0;
1447 #ifndef OPENSSL_NO_RSA
1448                 if (type & SSL_kRSA)
1449                         {
1450                         rsa=cert->rsa_tmp;
1451                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1452                                 {
1453                                 rsa=s->cert->rsa_tmp_cb(s,
1454                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1455                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1456                                 if(rsa == NULL)
1457                                 {
1458                                         al=SSL_AD_HANDSHAKE_FAILURE;
1459                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1460                                         goto f_err;
1461                                 }
1462                                 RSA_up_ref(rsa);
1463                                 cert->rsa_tmp=rsa;
1464                                 }
1465                         if (rsa == NULL)
1466                                 {
1467                                 al=SSL_AD_HANDSHAKE_FAILURE;
1468                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1469                                 goto f_err;
1470                                 }
1471                         r[0]=rsa->n;
1472                         r[1]=rsa->e;
1473                         s->s3->tmp.use_rsa_tmp=1;
1474                         }
1475                 else
1476 #endif
1477 #ifndef OPENSSL_NO_DH
1478                         if (type & SSL_kEDH)
1479                         {
1480                         dhp=cert->dh_tmp;
1481                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1482                                 dhp=s->cert->dh_tmp_cb(s,
1483                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1484                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1485                         if (dhp == NULL)
1486                                 {
1487                                 al=SSL_AD_HANDSHAKE_FAILURE;
1488                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1489                                 goto f_err;
1490                                 }
1491
1492                         if (s->s3->tmp.dh != NULL)
1493                                 {
1494                                 DH_free(dh);
1495                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1496                                 goto err;
1497                                 }
1498
1499                         if ((dh=DHparams_dup(dhp)) == NULL)
1500                                 {
1501                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1502                                 goto err;
1503                                 }
1504
1505                         s->s3->tmp.dh=dh;
1506                         if ((dhp->pub_key == NULL ||
1507                              dhp->priv_key == NULL ||
1508                              (s->options & SSL_OP_SINGLE_DH_USE)))
1509                                 {
1510                                 if(!DH_generate_key(dh))
1511                                     {
1512                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1513                                            ERR_R_DH_LIB);
1514                                     goto err;
1515                                     }
1516                                 }
1517                         else
1518                                 {
1519                                 dh->pub_key=BN_dup(dhp->pub_key);
1520                                 dh->priv_key=BN_dup(dhp->priv_key);
1521                                 if ((dh->pub_key == NULL) ||
1522                                         (dh->priv_key == NULL))
1523                                         {
1524                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1525                                         goto err;
1526                                         }
1527                                 }
1528                         r[0]=dh->p;
1529                         r[1]=dh->g;
1530                         r[2]=dh->pub_key;
1531                         }
1532                 else
1533 #endif
1534 #ifndef OPENSSL_NO_ECDH
1535                         if (type & SSL_kEECDH)
1536                         {
1537                         const EC_GROUP *group;
1538
1539                         ecdhp=cert->ecdh_tmp;
1540                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1541                                 {
1542                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1543                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1544                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1545                                 }
1546                         if (ecdhp == NULL)
1547                                 {
1548                                 al=SSL_AD_HANDSHAKE_FAILURE;
1549                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1550                                 goto f_err;
1551                                 }
1552
1553                         if (s->s3->tmp.ecdh != NULL)
1554                                 {
1555                                 EC_KEY_free(s->s3->tmp.ecdh);
1556                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1557                                 goto err;
1558                                 }
1559
1560                         /* Duplicate the ECDH structure. */
1561                         if (ecdhp == NULL)
1562                                 {
1563                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1564                                 goto err;
1565                                 }
1566                         if (!EC_KEY_up_ref(ecdhp))
1567                                 {
1568                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1569                                 goto err;
1570                                 }
1571                         ecdh = ecdhp;
1572
1573                         s->s3->tmp.ecdh=ecdh;
1574                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1575                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1576                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1577                                 {
1578                                 if(!EC_KEY_generate_key(ecdh))
1579                                     {
1580                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1581                                     goto err;
1582                                     }
1583                                 }
1584
1585                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1586                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1587                             (EC_KEY_get0_private_key(ecdh) == NULL))
1588                                 {
1589                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1590                                 goto err;
1591                                 }
1592
1593                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1594                             (EC_GROUP_get_degree(group) > 163))
1595                                 {
1596                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1597                                 goto err;
1598                                 }
1599
1600                         /* XXX: For now, we only support ephemeral ECDH
1601                          * keys over named (not generic) curves. For
1602                          * supported named curves, curve_id is non-zero.
1603                          */
1604                         if ((curve_id =
1605                             tls1_ec_nid2curve_id(EC_GROUP_get_curve_name(group)))
1606                             == 0)
1607                                 {
1608                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1609                                 goto err;
1610                                 }
1611
1612                         /* Encode the public key.
1613                          * First check the size of encoding and
1614                          * allocate memory accordingly.
1615                          */
1616                         encodedlen = EC_POINT_point2oct(group,
1617                             EC_KEY_get0_public_key(ecdh),
1618                             POINT_CONVERSION_UNCOMPRESSED,
1619                             NULL, 0, NULL);
1620
1621                         encodedPoint = (unsigned char *)
1622                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1623                         bn_ctx = BN_CTX_new();
1624                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1625                                 {
1626                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1627                                 goto err;
1628                                 }
1629
1630
1631                         encodedlen = EC_POINT_point2oct(group,
1632                             EC_KEY_get0_public_key(ecdh),
1633                             POINT_CONVERSION_UNCOMPRESSED,
1634                             encodedPoint, encodedlen, bn_ctx);
1635
1636                         if (encodedlen == 0)
1637                                 {
1638                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1639                                 goto err;
1640                                 }
1641
1642                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1643
1644                         /* XXX: For now, we only support named (not
1645                          * generic) curves in ECDH ephemeral key exchanges.
1646                          * In this situation, we need four additional bytes
1647                          * to encode the entire ServerECDHParams
1648                          * structure.
1649                          */
1650                         n = 4 + encodedlen;
1651
1652                         /* We'll generate the serverKeyExchange message
1653                          * explicitly so we can set these to NULLs
1654                          */
1655                         r[0]=NULL;
1656                         r[1]=NULL;
1657                         r[2]=NULL;
1658                         r[3]=NULL;
1659                         }
1660                 else
1661 #endif /* !OPENSSL_NO_ECDH */
1662 #ifndef OPENSSL_NO_PSK
1663                         if (type & SSL_kPSK)
1664                                 {
1665                                 /* reserve size for record length and PSK identity hint*/
1666                                 n+=2+strlen(s->ctx->psk_identity_hint);
1667                                 }
1668                         else
1669 #endif /* !OPENSSL_NO_PSK */
1670                         {
1671                         al=SSL_AD_HANDSHAKE_FAILURE;
1672                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1673                         goto f_err;
1674                         }
1675                 for (i=0; r[i] != NULL; i++)
1676                         {
1677                         nr[i]=BN_num_bytes(r[i]);
1678                         n+=2+nr[i];
1679                         }
1680
1681                 if (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
1682                         && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
1683                         {
1684                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1685                                 == NULL)
1686                                 {
1687                                 al=SSL_AD_DECODE_ERROR;
1688                                 goto f_err;
1689                                 }
1690                         kn=EVP_PKEY_size(pkey);
1691                         }
1692                 else
1693                         {
1694                         pkey=NULL;
1695                         kn=0;
1696                         }
1697
1698                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1699                         {
1700                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1701                         goto err;
1702                         }
1703                 d=(unsigned char *)s->init_buf->data;
1704                 p= &(d[4]);
1705
1706                 for (i=0; r[i] != NULL; i++)
1707                         {
1708                         s2n(nr[i],p);
1709                         BN_bn2bin(r[i],p);
1710                         p+=nr[i];
1711                         }
1712
1713 #ifndef OPENSSL_NO_ECDH
1714                 if (type & SSL_kEECDH)
1715                         {
1716                         /* XXX: For now, we only support named (not generic) curves.
1717                          * In this situation, the serverKeyExchange message has:
1718                          * [1 byte CurveType], [2 byte CurveName]
1719                          * [1 byte length of encoded point], followed by
1720                          * the actual encoded point itself
1721                          */
1722                         *p = NAMED_CURVE_TYPE;
1723                         p += 1;
1724                         *p = 0;
1725                         p += 1;
1726                         *p = curve_id;
1727                         p += 1;
1728                         *p = encodedlen;
1729                         p += 1;
1730                         memcpy((unsigned char*)p,
1731                             (unsigned char *)encodedPoint,
1732                             encodedlen);
1733                         OPENSSL_free(encodedPoint);
1734                         p += encodedlen;
1735                         }
1736 #endif
1737
1738 #ifndef OPENSSL_NO_PSK
1739                 if (type & SSL_kPSK)
1740                         {
1741                         /* copy PSK identity hint */
1742                         s2n(strlen(s->ctx->psk_identity_hint), p);
1743                         strncpy((char *)p, s->ctx->psk_identity_hint, strlen(s->ctx->psk_identity_hint));
1744                         p+=strlen(s->ctx->psk_identity_hint);
1745                         }
1746 #endif
1747
1748                 /* not anonymous */
1749                 if (pkey != NULL)
1750                         {
1751                         /* n is the length of the params, they start at &(d[4])
1752                          * and p points to the space at the end. */
1753 #ifndef OPENSSL_NO_RSA
1754                         if (pkey->type == EVP_PKEY_RSA)
1755                                 {
1756                                 q=md_buf;
1757                                 j=0;
1758                                 for (num=2; num > 0; num--)
1759                                         {
1760                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1761                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1762                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1763                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1764                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1765                                         EVP_DigestFinal_ex(&md_ctx,q,
1766                                                 (unsigned int *)&i);
1767                                         q+=i;
1768                                         j+=i;
1769                                         }
1770                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1771                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1772                                         {
1773                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1774                                         goto err;
1775                                         }
1776                                 s2n(u,p);
1777                                 n+=u+2;
1778                                 }
1779                         else
1780 #endif
1781 #if !defined(OPENSSL_NO_DSA)
1782                                 if (pkey->type == EVP_PKEY_DSA)
1783                                 {
1784                                 /* lets do DSS */
1785                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1786                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1787                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1788                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1789                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1790                                         (unsigned int *)&i,pkey))
1791                                         {
1792                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1793                                         goto err;
1794                                         }
1795                                 s2n(i,p);
1796                                 n+=i+2;
1797                                 }
1798                         else
1799 #endif
1800 #if !defined(OPENSSL_NO_ECDSA)
1801                                 if (pkey->type == EVP_PKEY_EC)
1802                                 {
1803                                 /* let's do ECDSA */
1804                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1805                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1806                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1807                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1808                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1809                                         (unsigned int *)&i,pkey))
1810                                         {
1811                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1812                                         goto err;
1813                                         }
1814                                 s2n(i,p);
1815                                 n+=i+2;
1816                                 }
1817                         else
1818 #endif
1819                                 {
1820                                 /* Is this error check actually needed? */
1821                                 al=SSL_AD_HANDSHAKE_FAILURE;
1822                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1823                                 goto f_err;
1824                                 }
1825                         }
1826
1827                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1828                 l2n3(n,d);
1829
1830                 /* we should now have things packed up, so lets send
1831                  * it off */
1832                 s->init_num=n+4;
1833                 s->init_off=0;
1834                 }
1835
1836         s->state = SSL3_ST_SW_KEY_EXCH_B;
1837         EVP_MD_CTX_cleanup(&md_ctx);
1838         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1839 f_err:
1840         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1841 err:
1842 #ifndef OPENSSL_NO_ECDH
1843         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1844         BN_CTX_free(bn_ctx);
1845 #endif
1846         EVP_MD_CTX_cleanup(&md_ctx);
1847         return(-1);
1848         }
1849
1850 int ssl3_send_certificate_request(SSL *s)
1851         {
1852         unsigned char *p,*d;
1853         int i,j,nl,off,n;
1854         STACK_OF(X509_NAME) *sk=NULL;
1855         X509_NAME *name;
1856         BUF_MEM *buf;
1857
1858         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1859                 {
1860                 buf=s->init_buf;
1861
1862                 d=p=(unsigned char *)&(buf->data[4]);
1863
1864                 /* get the list of acceptable cert types */
1865                 p++;
1866                 n=ssl3_get_req_cert_type(s,p);
1867                 d[0]=n;
1868                 p+=n;
1869                 n++;
1870
1871                 off=n;
1872                 p+=2;
1873                 n+=2;
1874
1875                 sk=SSL_get_client_CA_list(s);
1876                 nl=0;
1877                 if (sk != NULL)
1878                         {
1879                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1880                                 {
1881                                 name=sk_X509_NAME_value(sk,i);
1882                                 j=i2d_X509_NAME(name,NULL);
1883                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1884                                         {
1885                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1886                                         goto err;
1887                                         }
1888                                 p=(unsigned char *)&(buf->data[4+n]);
1889                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1890                                         {
1891                                         s2n(j,p);
1892                                         i2d_X509_NAME(name,&p);
1893                                         n+=2+j;
1894                                         nl+=2+j;
1895                                         }
1896                                 else
1897                                         {
1898                                         d=p;
1899                                         i2d_X509_NAME(name,&p);
1900                                         j-=2; s2n(j,d); j+=2;
1901                                         n+=j;
1902                                         nl+=j;
1903                                         }
1904                                 }
1905                         }
1906                 /* else no CA names */
1907                 p=(unsigned char *)&(buf->data[4+off]);
1908                 s2n(nl,p);
1909
1910                 d=(unsigned char *)buf->data;
1911                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1912                 l2n3(n,d);
1913
1914                 /* we should now have things packed up, so lets send
1915                  * it off */
1916
1917                 s->init_num=n+4;
1918                 s->init_off=0;
1919 #ifdef NETSCAPE_HANG_BUG
1920                 p=(unsigned char *)s->init_buf->data + s->init_num;
1921
1922                 /* do the header */
1923                 *(p++)=SSL3_MT_SERVER_DONE;
1924                 *(p++)=0;
1925                 *(p++)=0;
1926                 *(p++)=0;
1927                 s->init_num += 4;
1928 #endif
1929
1930                 s->state = SSL3_ST_SW_CERT_REQ_B;
1931                 }
1932
1933         /* SSL3_ST_SW_CERT_REQ_B */
1934         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1935 err:
1936         return(-1);
1937         }
1938
1939 int ssl3_get_client_key_exchange(SSL *s)
1940         {
1941         int i,al,ok;
1942         long n;
1943         unsigned long alg_k;
1944         unsigned char *p;
1945 #ifndef OPENSSL_NO_RSA
1946         RSA *rsa=NULL;
1947         EVP_PKEY *pkey=NULL;
1948 #endif
1949 #ifndef OPENSSL_NO_DH
1950         BIGNUM *pub=NULL;
1951         DH *dh_srvr;
1952 #endif
1953 #ifndef OPENSSL_NO_KRB5
1954         KSSL_ERR kssl_err;
1955 #endif /* OPENSSL_NO_KRB5 */
1956
1957 #ifndef OPENSSL_NO_ECDH
1958         EC_KEY *srvr_ecdh = NULL;
1959         EVP_PKEY *clnt_pub_pkey = NULL;
1960         EC_POINT *clnt_ecpoint = NULL;
1961         BN_CTX *bn_ctx = NULL;
1962 #endif
1963
1964         n=s->method->ssl_get_message(s,
1965                 SSL3_ST_SR_KEY_EXCH_A,
1966                 SSL3_ST_SR_KEY_EXCH_B,
1967                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1968                 2048, /* ??? */
1969                 &ok);
1970
1971         if (!ok) return((int)n);
1972         p=(unsigned char *)s->init_msg;
1973
1974         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1975
1976 #ifndef OPENSSL_NO_RSA
1977         if (alg_k & SSL_kRSA)
1978                 {
1979                 /* FIX THIS UP EAY EAY EAY EAY */
1980                 if (s->s3->tmp.use_rsa_tmp)
1981                         {
1982                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1983                                 rsa=s->cert->rsa_tmp;
1984                         /* Don't do a callback because rsa_tmp should
1985                          * be sent already */
1986                         if (rsa == NULL)
1987                                 {
1988                                 al=SSL_AD_HANDSHAKE_FAILURE;
1989                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1990                                 goto f_err;
1991
1992                                 }
1993                         }
1994                 else
1995                         {
1996                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1997                         if (    (pkey == NULL) ||
1998                                 (pkey->type != EVP_PKEY_RSA) ||
1999                                 (pkey->pkey.rsa == NULL))
2000                                 {
2001                                 al=SSL_AD_HANDSHAKE_FAILURE;
2002                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
2003                                 goto f_err;
2004                                 }
2005                         rsa=pkey->pkey.rsa;
2006                         }
2007
2008                 /* TLS and [incidentally] DTLS{0xFEFF} */
2009                 if (s->version > SSL3_VERSION && s->version != DTLS1_BAD_VER)
2010                         {
2011                         n2s(p,i);
2012                         if (n != i+2)
2013                                 {
2014                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
2015                                         {
2016                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
2017                                         goto err;
2018                                         }
2019                                 else
2020                                         p-=2;
2021                                 }
2022                         else
2023                                 n=i;
2024                         }
2025
2026                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
2027
2028                 al = -1;
2029
2030                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
2031                         {
2032                         al=SSL_AD_DECODE_ERROR;
2033                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
2034                         }
2035
2036                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
2037                         {
2038                         /* The premaster secret must contain the same version number as the
2039                          * ClientHello to detect version rollback attacks (strangely, the
2040                          * protocol does not offer such protection for DH ciphersuites).
2041                          * However, buggy clients exist that send the negotiated protocol
2042                          * version instead if the server does not support the requested
2043                          * protocol version.
2044                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
2045                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
2046                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
2047                                 {
2048                                 al=SSL_AD_DECODE_ERROR;
2049                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
2050
2051                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
2052                                  * (http://eprint.iacr.org/2003/052/) exploits the version
2053                                  * number check as a "bad version oracle" -- an alert would
2054                                  * reveal that the plaintext corresponding to some ciphertext
2055                                  * made up by the adversary is properly formatted except
2056                                  * that the version number is wrong.  To avoid such attacks,
2057                                  * we should treat this just like any other decryption error. */
2058                                 }
2059                         }
2060
2061                 if (al != -1)
2062                         {
2063                         /* Some decryption failure -- use random value instead as countermeasure
2064                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
2065                          * (see RFC 2246, section 7.4.7.1). */
2066                         ERR_clear_error();
2067                         i = SSL_MAX_MASTER_KEY_LENGTH;
2068                         p[0] = s->client_version >> 8;
2069                         p[1] = s->client_version & 0xff;
2070                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
2071                                 goto err;
2072                         }
2073
2074                 s->session->master_key_length=
2075                         s->method->ssl3_enc->generate_master_secret(s,
2076                                 s->session->master_key,
2077                                 p,i);
2078                 OPENSSL_cleanse(p,i);
2079                 }
2080         else
2081 #endif
2082 #ifndef OPENSSL_NO_DH
2083                 if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2084                 {
2085                 n2s(p,i);
2086                 if (n != i+2)
2087                         {
2088                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
2089                                 {
2090                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
2091                                 goto err;
2092                                 }
2093                         else
2094                                 {
2095                                 p-=2;
2096                                 i=(int)n;
2097                                 }
2098                         }
2099
2100                 if (n == 0L) /* the parameters are in the cert */
2101                         {
2102                         al=SSL_AD_HANDSHAKE_FAILURE;
2103                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
2104                         goto f_err;
2105                         }
2106                 else
2107                         {
2108                         if (s->s3->tmp.dh == NULL)
2109                                 {
2110                                 al=SSL_AD_HANDSHAKE_FAILURE;
2111                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
2112                                 goto f_err;
2113                                 }
2114                         else
2115                                 dh_srvr=s->s3->tmp.dh;
2116                         }
2117
2118                 pub=BN_bin2bn(p,i,NULL);
2119                 if (pub == NULL)
2120                         {
2121                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
2122                         goto err;
2123                         }
2124
2125                 i=DH_compute_key(p,pub,dh_srvr);
2126
2127                 if (i <= 0)
2128                         {
2129                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2130                         goto err;
2131                         }
2132
2133                 DH_free(s->s3->tmp.dh);
2134                 s->s3->tmp.dh=NULL;
2135
2136                 BN_clear_free(pub);
2137                 pub=NULL;
2138                 s->session->master_key_length=
2139                         s->method->ssl3_enc->generate_master_secret(s,
2140                                 s->session->master_key,p,i);
2141                 OPENSSL_cleanse(p,i);
2142                 }
2143         else
2144 #endif
2145 #ifndef OPENSSL_NO_KRB5
2146         if (alg_k & SSL_kKRB5)
2147                 {
2148                 krb5_error_code         krb5rc;
2149                 krb5_data               enc_ticket;
2150                 krb5_data               authenticator;
2151                 krb5_data               enc_pms;
2152                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
2153                 EVP_CIPHER_CTX          ciph_ctx;
2154                 const EVP_CIPHER        *enc = NULL;
2155                 unsigned char           iv[EVP_MAX_IV_LENGTH];
2156                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
2157                                                + EVP_MAX_BLOCK_LENGTH];
2158                 int                  padl, outl;
2159                 krb5_timestamp          authtime = 0;
2160                 krb5_ticket_times       ttimes;
2161
2162                 EVP_CIPHER_CTX_init(&ciph_ctx);
2163
2164                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
2165
2166                 n2s(p,i);
2167                 enc_ticket.length = i;
2168
2169                 if (n < (long)(enc_ticket.length + 6))
2170                         {
2171                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2172                                 SSL_R_DATA_LENGTH_TOO_LONG);
2173                         goto err;
2174                         }
2175
2176                 enc_ticket.data = (char *)p;
2177                 p+=enc_ticket.length;
2178
2179                 n2s(p,i);
2180                 authenticator.length = i;
2181
2182                 if (n < (long)(enc_ticket.length + authenticator.length + 6))
2183                         {
2184                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2185                                 SSL_R_DATA_LENGTH_TOO_LONG);
2186                         goto err;
2187                         }
2188
2189                 authenticator.data = (char *)p;
2190                 p+=authenticator.length;
2191
2192                 n2s(p,i);
2193                 enc_pms.length = i;
2194                 enc_pms.data = (char *)p;
2195                 p+=enc_pms.length;
2196
2197                 /* Note that the length is checked again below,
2198                 ** after decryption
2199                 */
2200                 if(enc_pms.length > sizeof pms)
2201                         {
2202                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2203                                SSL_R_DATA_LENGTH_TOO_LONG);
2204                         goto err;
2205                         }
2206
2207                 if (n != (long)(enc_ticket.length + authenticator.length +
2208                                                 enc_pms.length + 6))
2209                         {
2210                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2211                                 SSL_R_DATA_LENGTH_TOO_LONG);
2212                         goto err;
2213                         }
2214
2215                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2216                                         &kssl_err)) != 0)
2217                         {
2218 #ifdef KSSL_DEBUG
2219                         printf("kssl_sget_tkt rtn %d [%d]\n",
2220                                 krb5rc, kssl_err.reason);
2221                         if (kssl_err.text)
2222                                 printf("kssl_err text= %s\n", kssl_err.text);
2223 #endif  /* KSSL_DEBUG */
2224                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2225                                 kssl_err.reason);
2226                         goto err;
2227                         }
2228
2229                 /*  Note: no authenticator is not considered an error,
2230                 **  but will return authtime == 0.
2231                 */
2232                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2233                                         &authtime, &kssl_err)) != 0)
2234                         {
2235 #ifdef KSSL_DEBUG
2236                         printf("kssl_check_authent rtn %d [%d]\n",
2237                                 krb5rc, kssl_err.reason);
2238                         if (kssl_err.text)
2239                                 printf("kssl_err text= %s\n", kssl_err.text);
2240 #endif  /* KSSL_DEBUG */
2241                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2242                                 kssl_err.reason);
2243                         goto err;
2244                         }
2245
2246                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2247                         {
2248                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2249                         goto err;
2250                         }
2251
2252 #ifdef KSSL_DEBUG
2253                 kssl_ctx_show(kssl_ctx);
2254 #endif  /* KSSL_DEBUG */
2255
2256                 enc = kssl_map_enc(kssl_ctx->enctype);
2257                 if (enc == NULL)
2258                     goto err;
2259
2260                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2261
2262                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2263                         {
2264                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2265                                 SSL_R_DECRYPTION_FAILED);
2266                         goto err;
2267                         }
2268                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2269                                         (unsigned char *)enc_pms.data, enc_pms.length))
2270                         {
2271                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2272                                 SSL_R_DECRYPTION_FAILED);
2273                         goto err;
2274                         }
2275                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2276                         {
2277                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2278                                 SSL_R_DATA_LENGTH_TOO_LONG);
2279                         goto err;
2280                         }
2281                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2282                         {
2283                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2284                                 SSL_R_DECRYPTION_FAILED);
2285                         goto err;
2286                         }
2287                 outl += padl;
2288                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2289                         {
2290                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2291                                 SSL_R_DATA_LENGTH_TOO_LONG);
2292                         goto err;
2293                         }
2294                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2295                     {
2296                     /* The premaster secret must contain the same version number as the
2297                      * ClientHello to detect version rollback attacks (strangely, the
2298                      * protocol does not offer such protection for DH ciphersuites).
2299                      * However, buggy clients exist that send random bytes instead of
2300                      * the protocol version.
2301                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2302                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2303                      */
2304                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2305                         {
2306                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2307                                SSL_AD_DECODE_ERROR);
2308                         goto err;
2309                         }
2310                     }
2311
2312                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2313
2314                 s->session->master_key_length=
2315                         s->method->ssl3_enc->generate_master_secret(s,
2316                                 s->session->master_key, pms, outl);
2317
2318                 if (kssl_ctx->client_princ)
2319                         {
2320                         size_t len = strlen(kssl_ctx->client_princ);
2321                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2322                                 {
2323                                 s->session->krb5_client_princ_len = len;
2324                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2325                                 }
2326                         }
2327
2328
2329                 /*  Was doing kssl_ctx_free() here,
2330                 **  but it caused problems for apache.
2331                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2332                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2333                 */
2334                 }
2335         else
2336 #endif  /* OPENSSL_NO_KRB5 */
2337
2338 #ifndef OPENSSL_NO_ECDH
2339                 if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2340                 {
2341                 int ret = 1;
2342                 int field_size = 0;
2343                 const EC_KEY   *tkey;
2344                 const EC_GROUP *group;
2345                 const BIGNUM *priv_key;
2346
2347                 /* initialize structures for server's ECDH key pair */
2348                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2349                         {
2350                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2351                             ERR_R_MALLOC_FAILURE);
2352                         goto err;
2353                         }
2354
2355                 /* Let's get server private key and group information */
2356                 if (alg_k & (SSL_kECDHr|SSL_kECDHe))
2357                         {
2358                         /* use the certificate */
2359                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2360                         }
2361                 else
2362                         {
2363                         /* use the ephermeral values we saved when
2364                          * generating the ServerKeyExchange msg.
2365                          */
2366                         tkey = s->s3->tmp.ecdh;
2367                         }
2368
2369                 group    = EC_KEY_get0_group(tkey);
2370                 priv_key = EC_KEY_get0_private_key(tkey);
2371
2372                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2373                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2374                         {
2375                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2376                                ERR_R_EC_LIB);
2377                         goto err;
2378                         }
2379
2380                 /* Let's get client's public key */
2381                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2382                         {
2383                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2384                             ERR_R_MALLOC_FAILURE);
2385                         goto err;
2386                         }
2387
2388                 if (n == 0L)
2389                         {
2390                         /* Client Publickey was in Client Certificate */
2391
2392                          if (alg_k & SSL_kEECDH)
2393                                  {
2394                                  al=SSL_AD_HANDSHAKE_FAILURE;
2395                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2396                                  goto f_err;
2397                                  }
2398                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2399                             == NULL) ||
2400                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2401                                 {
2402                                 /* XXX: For now, we do not support client
2403                                  * authentication using ECDH certificates
2404                                  * so this branch (n == 0L) of the code is
2405                                  * never executed. When that support is
2406                                  * added, we ought to ensure the key
2407                                  * received in the certificate is
2408                                  * authorized for key agreement.
2409                                  * ECDH_compute_key implicitly checks that
2410                                  * the two ECDH shares are for the same
2411                                  * group.
2412                                  */
2413                                 al=SSL_AD_HANDSHAKE_FAILURE;
2414                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2415                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2416                                 goto f_err;
2417                                 }
2418
2419                         if (EC_POINT_copy(clnt_ecpoint,
2420                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2421                                 {
2422                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2423                                         ERR_R_EC_LIB);
2424                                 goto err;
2425                                 }
2426                         ret = 2; /* Skip certificate verify processing */
2427                         }
2428                 else
2429                         {
2430                         /* Get client's public key from encoded point
2431                          * in the ClientKeyExchange message.
2432                          */
2433                         if ((bn_ctx = BN_CTX_new()) == NULL)
2434                                 {
2435                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2436                                     ERR_R_MALLOC_FAILURE);
2437                                 goto err;
2438                                 }
2439
2440                         /* Get encoded point length */
2441                         i = *p;
2442                         p += 1;
2443                         if (EC_POINT_oct2point(group,
2444                             clnt_ecpoint, p, i, bn_ctx) == 0)
2445                                 {
2446                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2447                                     ERR_R_EC_LIB);
2448                                 goto err;
2449                                 }
2450                         /* p is pointing to somewhere in the buffer
2451                          * currently, so set it to the start
2452                          */
2453                         p=(unsigned char *)s->init_buf->data;
2454                         }
2455
2456                 /* Compute the shared pre-master secret */
2457                 field_size = EC_GROUP_get_degree(group);
2458                 if (field_size <= 0)
2459                         {
2460                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2461                                ERR_R_ECDH_LIB);
2462                         goto err;
2463                         }
2464                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2465                 if (i <= 0)
2466                         {
2467                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2468                             ERR_R_ECDH_LIB);
2469                         goto err;
2470                         }
2471
2472                 EVP_PKEY_free(clnt_pub_pkey);
2473                 EC_POINT_free(clnt_ecpoint);
2474                 EC_KEY_free(srvr_ecdh);
2475                 BN_CTX_free(bn_ctx);
2476                 EC_KEY_free(s->s3->tmp.ecdh);
2477                 s->s3->tmp.ecdh = NULL;
2478
2479                 /* Compute the master secret */
2480                 s->session->master_key_length = s->method->ssl3_enc-> \
2481                     generate_master_secret(s, s->session->master_key, p, i);
2482
2483                 OPENSSL_cleanse(p, i);
2484                 return (ret);
2485                 }
2486         else
2487 #endif
2488 #ifndef OPENSSL_NO_PSK
2489                 if (alg_k & SSL_kPSK)
2490                         {
2491                         unsigned char *t = NULL;
2492                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2493                         unsigned int pre_ms_len = 0, psk_len = 0;
2494                         int psk_err = 1;
2495                         char tmp_id[PSK_MAX_IDENTITY_LEN+1];
2496
2497                         al=SSL_AD_HANDSHAKE_FAILURE;
2498
2499                         n2s(p,i);
2500                         if (n != i+2)
2501                                 {
2502                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2503                                         SSL_R_LENGTH_MISMATCH);
2504                                 goto psk_err;
2505                                 }
2506                         if (i > PSK_MAX_IDENTITY_LEN)
2507                                 {
2508                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2509                                         SSL_R_DATA_LENGTH_TOO_LONG);
2510                                 goto psk_err;
2511                                 }
2512                         if (s->psk_server_callback == NULL)
2513                                 {
2514                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2515                                        SSL_R_PSK_NO_SERVER_CB);
2516                                 goto psk_err;
2517                                 }
2518
2519                         /* Create guaranteed NULL-terminated identity
2520                          * string for the callback */
2521                         memcpy(tmp_id, p, i);
2522                         memset(tmp_id+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
2523                         psk_len = s->psk_server_callback(s, tmp_id,
2524                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
2525                         OPENSSL_cleanse(tmp_id, PSK_MAX_IDENTITY_LEN+1);
2526
2527                         if (psk_len > PSK_MAX_PSK_LEN)
2528                                 {
2529                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2530                                         ERR_R_INTERNAL_ERROR);
2531                                 goto psk_err;
2532                                 }
2533                         else if (psk_len == 0)
2534                                 {
2535                                 /* PSK related to the given identity not found */
2536                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2537                                        SSL_R_PSK_IDENTITY_NOT_FOUND);
2538                                 al=SSL_AD_UNKNOWN_PSK_IDENTITY;
2539                                 goto psk_err;
2540                                 }
2541
2542                         /* create PSK pre_master_secret */
2543                         pre_ms_len=2+psk_len+2+psk_len;
2544                         t = psk_or_pre_ms;
2545                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
2546                         s2n(psk_len, t);
2547                         memset(t, 0, psk_len);
2548                         t+=psk_len;
2549                         s2n(psk_len, t);
2550
2551                         if (s->session->psk_identity != NULL)
2552                                 OPENSSL_free(s->session->psk_identity);
2553                         s->session->psk_identity = BUF_strdup((char *)p);
2554                         if (s->session->psk_identity == NULL)
2555                                 {
2556                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2557                                         ERR_R_MALLOC_FAILURE);
2558                                 goto psk_err;
2559                                 }
2560
2561                         if (s->session->psk_identity_hint != NULL)
2562                                 OPENSSL_free(s->session->psk_identity_hint);
2563                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
2564                         if (s->ctx->psk_identity_hint != NULL &&
2565                                 s->session->psk_identity_hint == NULL)
2566                                 {
2567                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2568                                         ERR_R_MALLOC_FAILURE);
2569                                 goto psk_err;
2570                                 }
2571
2572                         s->session->master_key_length=
2573                                 s->method->ssl3_enc->generate_master_secret(s,
2574                                         s->session->master_key, psk_or_pre_ms, pre_ms_len);
2575                         psk_err = 0;
2576                 psk_err:
2577                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
2578                         if (psk_err != 0)
2579                                 goto f_err;
2580                         }
2581                 else
2582 #endif
2583                 if (alg_k & SSL_kGOST)
2584                         {
2585                         int ret = 0;
2586                         EVP_PKEY_CTX *pkey_ctx;
2587                         EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
2588                         unsigned char premaster_secret[32], *start;
2589                         size_t outlen=32, inlen;
2590                         unsigned long alg_a;
2591
2592                         /* Get our certificate private key*/
2593                         alg_a = s->s3->tmp.new_cipher->algorithm_auth;
2594                         if (alg_a & SSL_aGOST94)
2595                                 pk = s->cert->pkeys[SSL_PKEY_GOST94].privatekey;
2596                         else if (alg_a & SSL_aGOST01)
2597                                 pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
2598
2599                         pkey_ctx = EVP_PKEY_CTX_new(pk,NULL);
2600                         EVP_PKEY_decrypt_init(pkey_ctx);
2601                         /* If client certificate is present and is of the same type, maybe
2602                          * use it for key exchange.  Don't mind errors from
2603                          * EVP_PKEY_derive_set_peer, because it is completely valid to use
2604                          * a client certificate for authorization only. */
2605                         client_pub_pkey = X509_get_pubkey(s->session->peer);
2606                         if (client_pub_pkey)
2607                                 {
2608                                 if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
2609                                         ERR_clear_error();
2610                                 }
2611                         /* Decrypt session key */
2612                         if ((*p!=( V_ASN1_SEQUENCE| V_ASN1_CONSTRUCTED)))
2613                                 {
2614                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2615                                 goto gerr;
2616                                 }
2617                         if (p[1] == 0x81)
2618                                 {
2619                                 start = p+3;
2620                                 inlen = p[2];
2621                                 }
2622                         else if (p[1] < 0x80)
2623                                 {
2624                                 start = p+2;
2625                                 inlen = p[1];
2626                                 }
2627                         else
2628                                 {
2629                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2630                                 goto gerr;
2631                                 }
2632                         if (EVP_PKEY_decrypt(pkey_ctx,premaster_secret,&outlen,start,inlen) <=0)
2633
2634                                 {
2635                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DECRYPTION_FAILED);
2636                                 goto gerr;
2637                                 }
2638                         /* Generate master secret */
2639                         s->session->master_key_length=
2640                                 s->method->ssl3_enc->generate_master_secret(s,
2641                                         s->session->master_key,premaster_secret,32);
2642                         /* Check if pubkey from client certificate was used */
2643                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2644                                 ret = 2;
2645                         else
2646                                 ret = 1;
2647                 gerr:
2648                         EVP_PKEY_free(client_pub_pkey);
2649                         EVP_PKEY_CTX_free(pkey_ctx);
2650                         if (ret)
2651                                 return ret;
2652                         else
2653                                 goto err;
2654                         }
2655                 else
2656                 {
2657                 al=SSL_AD_HANDSHAKE_FAILURE;
2658                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2659                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2660                 goto f_err;
2661                 }
2662
2663         return(1);
2664 f_err:
2665         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2666 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2667 err:
2668 #endif
2669 #ifndef OPENSSL_NO_ECDH
2670         EVP_PKEY_free(clnt_pub_pkey);
2671         EC_POINT_free(clnt_ecpoint);
2672         if (srvr_ecdh != NULL)
2673                 EC_KEY_free(srvr_ecdh);
2674         BN_CTX_free(bn_ctx);
2675 #endif
2676         return(-1);
2677         }
2678
2679 int ssl3_get_cert_verify(SSL *s)
2680         {
2681         EVP_PKEY *pkey=NULL;
2682         unsigned char *p;
2683         int al,ok,ret=0;
2684         long n;
2685         int type=0,i,j;
2686         X509 *peer;
2687
2688         n=s->method->ssl_get_message(s,
2689                 SSL3_ST_SR_CERT_VRFY_A,
2690                 SSL3_ST_SR_CERT_VRFY_B,
2691                 -1,
2692                 514, /* 514? */
2693                 &ok);
2694
2695         if (!ok) return((int)n);
2696
2697         if (s->session->peer != NULL)
2698                 {
2699                 peer=s->session->peer;
2700                 pkey=X509_get_pubkey(peer);
2701                 type=X509_certificate_type(peer,pkey);
2702                 }
2703         else
2704                 {
2705                 peer=NULL;
2706                 pkey=NULL;
2707                 }
2708
2709         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2710                 {
2711                 s->s3->tmp.reuse_message=1;
2712                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2713                         {
2714                         al=SSL_AD_UNEXPECTED_MESSAGE;
2715                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2716                         goto f_err;
2717                         }
2718                 ret=1;
2719                 goto end;
2720                 }
2721
2722         if (peer == NULL)
2723                 {
2724                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2725                 al=SSL_AD_UNEXPECTED_MESSAGE;
2726                 goto f_err;
2727                 }
2728
2729         if (!(type & EVP_PKT_SIGN))
2730                 {
2731                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2732                 al=SSL_AD_ILLEGAL_PARAMETER;
2733                 goto f_err;
2734                 }
2735
2736         if (s->s3->change_cipher_spec)
2737                 {
2738                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2739                 al=SSL_AD_UNEXPECTED_MESSAGE;
2740                 goto f_err;
2741                 }
2742
2743         /* we now have a signature that we need to verify */
2744         p=(unsigned char *)s->init_msg;
2745         /* Check for broken implementations of GOST ciphersuites */
2746         /* If key is GOST and n is exactly 64, it is bare
2747          * signature without length field */
2748         if (n==64 && (pkey->type==NID_id_GostR3410_94 ||
2749                 pkey->type == NID_id_GostR3410_2001) )
2750                 {
2751                 i=64;
2752                 }
2753         else
2754                 {
2755                 n2s(p,i);
2756                 n-=2;
2757                 if (i > n)
2758                         {
2759                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2760                         al=SSL_AD_DECODE_ERROR;
2761                         goto f_err;
2762                         }
2763         }
2764         j=EVP_PKEY_size(pkey);
2765         if ((i > j) || (n > j) || (n <= 0))
2766                 {
2767                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2768                 al=SSL_AD_DECODE_ERROR;
2769                 goto f_err;
2770                 }
2771
2772 #ifndef OPENSSL_NO_RSA
2773         if (pkey->type == EVP_PKEY_RSA)
2774                 {
2775                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2776                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
2777                                                         pkey->pkey.rsa);
2778                 if (i < 0)
2779                         {
2780                         al=SSL_AD_DECRYPT_ERROR;
2781                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2782                         goto f_err;
2783                         }
2784                 if (i == 0)
2785                         {
2786                         al=SSL_AD_DECRYPT_ERROR;
2787                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2788                         goto f_err;
2789                         }
2790                 }
2791         else
2792 #endif
2793 #ifndef OPENSSL_NO_DSA
2794                 if (pkey->type == EVP_PKEY_DSA)
2795                 {
2796                 j=DSA_verify(pkey->save_type,
2797                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2798                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2799                 if (j <= 0)
2800                         {
2801                         /* bad signature */
2802                         al=SSL_AD_DECRYPT_ERROR;
2803                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2804                         goto f_err;
2805                         }
2806                 }
2807         else
2808 #endif
2809 #ifndef OPENSSL_NO_ECDSA
2810                 if (pkey->type == EVP_PKEY_EC)
2811                 {
2812                 j=ECDSA_verify(pkey->save_type,
2813                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2814                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2815                 if (j <= 0)
2816                         {
2817                         /* bad signature */
2818                         al=SSL_AD_DECRYPT_ERROR;
2819                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2820                             SSL_R_BAD_ECDSA_SIGNATURE);
2821                         goto f_err;
2822                         }
2823                 }
2824         else
2825 #endif
2826         if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
2827                 {   unsigned char signature[64];
2828                         int idx;
2829                         EVP_PKEY_CTX *pctx = EVP_PKEY_CTX_new(pkey,NULL);
2830                         EVP_PKEY_verify_init(pctx);
2831                         if (i!=64) {
2832                                 fprintf(stderr,"GOST signature length is %d",i);
2833                         }
2834                         for (idx=0;idx<64;idx++) {
2835                                 signature[63-idx]=p[idx];
2836                         }
2837                         j=EVP_PKEY_verify(pctx,signature,64,s->s3->tmp.cert_verify_md,32);
2838                         EVP_PKEY_CTX_free(pctx);
2839                         if (j<=0)
2840                                 {
2841                                 al=SSL_AD_DECRYPT_ERROR;
2842                                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2843                                         SSL_R_BAD_ECDSA_SIGNATURE);
2844                                 goto f_err;
2845                                 }
2846                 }
2847         else
2848                 {
2849                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2850                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2851                 goto f_err;
2852                 }
2853
2854
2855         ret=1;
2856         if (0)
2857                 {
2858 f_err:
2859                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2860                 }
2861 end:
2862         EVP_PKEY_free(pkey);
2863         return(ret);
2864         }
2865
2866 int ssl3_get_client_certificate(SSL *s)
2867         {
2868         int i,ok,al,ret= -1;
2869         X509 *x=NULL;
2870         unsigned long l,nc,llen,n;
2871         const unsigned char *p,*q;
2872         unsigned char *d;
2873         STACK_OF(X509) *sk=NULL;
2874
2875         n=s->method->ssl_get_message(s,
2876                 SSL3_ST_SR_CERT_A,
2877                 SSL3_ST_SR_CERT_B,
2878                 -1,
2879                 s->max_cert_list,
2880                 &ok);
2881
2882         if (!ok) return((int)n);
2883
2884         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2885                 {
2886                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2887                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2888                         {
2889                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2890                         al=SSL_AD_HANDSHAKE_FAILURE;
2891                         goto f_err;
2892                         }
2893                 /* If tls asked for a client cert, the client must return a 0 list */
2894                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2895                         {
2896                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2897                         al=SSL_AD_UNEXPECTED_MESSAGE;
2898                         goto f_err;
2899                         }
2900                 s->s3->tmp.reuse_message=1;
2901                 return(1);
2902                 }
2903
2904         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2905                 {
2906                 al=SSL_AD_UNEXPECTED_MESSAGE;
2907                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2908                 goto f_err;
2909                 }
2910         p=d=(unsigned char *)s->init_msg;
2911
2912         if ((sk=sk_X509_new_null()) == NULL)
2913                 {
2914                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2915                 goto err;
2916                 }
2917
2918         n2l3(p,llen);
2919         if (llen+3 != n)
2920                 {
2921                 al=SSL_AD_DECODE_ERROR;
2922                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2923                 goto f_err;
2924                 }
2925         for (nc=0; nc<llen; )
2926                 {
2927                 n2l3(p,l);
2928                 if ((l+nc+3) > llen)
2929                         {
2930                         al=SSL_AD_DECODE_ERROR;
2931                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2932                         goto f_err;
2933                         }
2934
2935                 q=p;
2936                 x=d2i_X509(NULL,&p,l);
2937                 if (x == NULL)
2938                         {
2939                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2940                         goto err;
2941                         }
2942                 if (p != (q+l))
2943                         {
2944                         al=SSL_AD_DECODE_ERROR;
2945                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2946                         goto f_err;
2947                         }
2948                 if (!sk_X509_push(sk,x))
2949                         {
2950                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2951                         goto err;
2952                         }
2953                 x=NULL;
2954                 nc+=l+3;
2955                 }
2956
2957         if (sk_X509_num(sk) <= 0)
2958                 {
2959                 /* TLS does not mind 0 certs returned */
2960                 if (s->version == SSL3_VERSION)
2961                         {
2962                         al=SSL_AD_HANDSHAKE_FAILURE;
2963                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2964                         goto f_err;
2965                         }
2966                 /* Fail for TLS only if we required a certificate */
2967                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2968                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2969                         {
2970                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2971                         al=SSL_AD_HANDSHAKE_FAILURE;
2972                         goto f_err;
2973                         }
2974                 }
2975         else
2976                 {
2977                 i=ssl_verify_cert_chain(s,sk);
2978                 if (i <= 0)
2979                         {
2980                         al=ssl_verify_alarm_type(s->verify_result);
2981                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2982                         goto f_err;
2983                         }
2984                 }
2985
2986         if (s->session->peer != NULL) /* This should not be needed */
2987                 X509_free(s->session->peer);
2988         s->session->peer=sk_X509_shift(sk);
2989         s->session->verify_result = s->verify_result;
2990
2991         /* With the current implementation, sess_cert will always be NULL
2992          * when we arrive here. */
2993         if (s->session->sess_cert == NULL)
2994                 {
2995                 s->session->sess_cert = ssl_sess_cert_new();
2996                 if (s->session->sess_cert == NULL)
2997                         {
2998                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2999                         goto err;
3000                         }
3001                 }
3002         if (s->session->sess_cert->cert_chain != NULL)
3003                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
3004         s->session->sess_cert->cert_chain=sk;
3005         /* Inconsistency alert: cert_chain does *not* include the
3006          * peer's own certificate, while we do include it in s3_clnt.c */
3007
3008         sk=NULL;
3009
3010         ret=1;
3011         if (0)
3012                 {
3013 f_err:
3014                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
3015                 }
3016 err:
3017         if (x != NULL) X509_free(x);
3018         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
3019         return(ret);
3020         }
3021
3022 int ssl3_send_server_certificate(SSL *s)
3023         {
3024         unsigned long l;
3025         X509 *x;
3026
3027         if (s->state == SSL3_ST_SW_CERT_A)
3028                 {
3029                 x=ssl_get_server_send_cert(s);
3030                 if (x == NULL)
3031                         {
3032                         /* VRS: allow null cert if auth == KRB5 */
3033                         if ((s->s3->tmp.new_cipher->algorithm_auth != SSL_aKRB5) ||
3034                             (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5))
3035                                 {
3036                                 SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
3037                                 return(0);
3038                                 }
3039                         }
3040
3041                 l=ssl3_output_cert_chain(s,x);
3042                 s->state=SSL3_ST_SW_CERT_B;
3043                 s->init_num=(int)l;
3044                 s->init_off=0;
3045                 }
3046
3047         /* SSL3_ST_SW_CERT_B */
3048         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3049         }
3050 #ifndef OPENSSL_NO_TLSEXT
3051 int ssl3_send_newsession_ticket(SSL *s)
3052         {
3053         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
3054                 {
3055                 unsigned char *p, *senc, *macstart;
3056                 int len, slen;
3057                 unsigned int hlen;
3058                 EVP_CIPHER_CTX ctx;
3059                 HMAC_CTX hctx;
3060                 SSL_CTX *tctx = s->initial_ctx;
3061                 unsigned char iv[EVP_MAX_IV_LENGTH];
3062                 unsigned char key_name[16];
3063
3064                 /* get session encoding length */
3065                 slen = i2d_SSL_SESSION(s->session, NULL);
3066                 /* Some length values are 16 bits, so forget it if session is
3067                  * too long
3068                  */
3069                 if (slen > 0xFF00)
3070                         return -1;
3071                 /* Grow buffer if need be: the length calculation is as
3072                  * follows 1 (size of message name) + 3 (message length
3073                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
3074                  * 16 (key name) + max_iv_len (iv length) +
3075                  * session_length + max_enc_block_size (max encrypted session
3076                  * length) + max_md_size (HMAC).
3077                  */
3078                 if (!BUF_MEM_grow(s->init_buf,
3079                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
3080                         EVP_MAX_MD_SIZE + slen))
3081                         return -1;
3082                 senc = OPENSSL_malloc(slen);
3083                 if (!senc)
3084                         return -1;
3085                 p = senc;
3086                 i2d_SSL_SESSION(s->session, &p);
3087
3088                 p=(unsigned char *)s->init_buf->data;
3089                 /* do the header */
3090                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
3091                 /* Skip message length for now */
3092                 p += 3;
3093                 EVP_CIPHER_CTX_init(&ctx);
3094                 HMAC_CTX_init(&hctx);
3095                 /* Initialize HMAC and cipher contexts. If callback present
3096                  * it does all the work otherwise use generated values
3097                  * from parent ctx.
3098                  */
3099                 if (tctx->tlsext_ticket_key_cb)
3100                         {
3101                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
3102                                                          &hctx, 1) < 0)
3103                                 {
3104                                 OPENSSL_free(senc);
3105                                 return -1;
3106                                 }
3107                         }
3108                 else
3109                         {
3110                         RAND_pseudo_bytes(iv, 16);
3111                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
3112                                         tctx->tlsext_tick_aes_key, iv);
3113                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
3114                                         tlsext_tick_md(), NULL);
3115                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
3116                         }
3117                 l2n(s->session->tlsext_tick_lifetime_hint, p);
3118                 /* Skip ticket length for now */
3119                 p += 2;
3120                 /* Output key name */
3121                 macstart = p;
3122                 memcpy(p, key_name, 16);
3123                 p += 16;
3124                 /* output IV */
3125                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
3126                 p += EVP_CIPHER_CTX_iv_length(&ctx);
3127                 /* Encrypt session data */
3128                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
3129                 p += len;
3130                 EVP_EncryptFinal(&ctx, p, &len);
3131                 p += len;
3132                 EVP_CIPHER_CTX_cleanup(&ctx);
3133
3134                 HMAC_Update(&hctx, macstart, p - macstart);
3135                 HMAC_Final(&hctx, p, &hlen);
3136                 HMAC_CTX_cleanup(&hctx);
3137
3138                 p += hlen;
3139                 /* Now write out lengths: p points to end of data written */
3140                 /* Total length */
3141                 len = p - (unsigned char *)s->init_buf->data;
3142                 p=(unsigned char *)s->init_buf->data + 1;
3143                 l2n3(len - 4, p); /* Message length */
3144                 p += 4;
3145                 s2n(len - 10, p);  /* Ticket length */
3146
3147                 /* number of bytes to write */
3148                 s->init_num= len;
3149                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
3150                 s->init_off=0;
3151                 OPENSSL_free(senc);
3152                 }
3153
3154         /* SSL3_ST_SW_SESSION_TICKET_B */
3155         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3156         }
3157
3158 int ssl3_send_cert_status(SSL *s)
3159         {
3160         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
3161                 {
3162                 unsigned char *p;
3163                 /* Grow buffer if need be: the length calculation is as
3164                  * follows 1 (message type) + 3 (message length) +
3165                  * 1 (ocsp response type) + 3 (ocsp response length)
3166                  * + (ocsp response)
3167                  */
3168                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
3169                         return -1;
3170
3171                 p=(unsigned char *)s->init_buf->data;
3172
3173                 /* do the header */
3174                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
3175                 /* message length */
3176                 l2n3(s->tlsext_ocsp_resplen + 4, p);
3177                 /* status type */
3178                 *(p++)= s->tlsext_status_type;
3179                 /* length of OCSP response */
3180                 l2n3(s->tlsext_ocsp_resplen, p);
3181                 /* actual response */
3182                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
3183                 /* number of bytes to write */
3184                 s->init_num = 8 + s->tlsext_ocsp_resplen;
3185                 s->state=SSL3_ST_SW_CERT_STATUS_B;
3186                 s->init_off = 0;
3187                 }
3188
3189         /* SSL3_ST_SW_CERT_STATUS_B */
3190         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3191         }
3192 #endif