ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c */
   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) 1998-2005 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 #define REUSE_CIPHER_BUG
 126 #define NETSCAPE_HANG_BUG
 127
 128 #include <stdio.h>
 129 #include "ssl_locl.h"
 130 #include "kssl_lcl.h"
 131 #include <openssl/buffer.h>
 132 #include <openssl/rand.h>
 133 #include <openssl/objects.h>
 134 #include <openssl/evp.h>
 135 #include <openssl/x509.h>
 136 #ifndef OPENSSL_NO_DH
 137 #include <openssl/dh.h>
 138 #endif
 139 #include <openssl/bn.h>
 140 #ifndef OPENSSL_NO_KRB5
 141 #include <openssl/krb5_asn.h>
 142 #endif
 143 #include <openssl/md5.h>
 144
 145 static const SSL_METHOD *ssl3_get_server_method(int ver);
 146
 147 #ifndef OPENSSL_NO_ECDH
 148 static int nid2curve_id(int nid);
 149 #endif
 150
 151 static const SSL_METHOD *ssl3_get_server_method(int ver)
 152         {
 153         if (ver == SSL3_VERSION)
 154                 return(SSLv3_server_method());
 155         else
 156                 return(NULL);
 157         }
 158
 159 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
 160                         ssl3_accept,
 161                         ssl_undefined_function,
 162                         ssl3_get_server_method)
 163
 164 int ssl3_accept(SSL *s)
 165         {
 166         BUF_MEM *buf;
 167         unsigned long l,Time=time(NULL);
 168         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 169         long num1;
 170         int ret= -1;
 171         int new_state,state,skip=0;
 172
 173         RAND_add(&Time,sizeof(Time),0);
 174         ERR_clear_error();
 175         clear_sys_error();
 176
 177         if (s->info_callback != NULL)
 178                 cb=s->info_callback;
 179         else if (s->ctx->info_callback != NULL)
 180                 cb=s->ctx->info_callback;
 181
 182         /* init things to blank */
 183         s->in_handshake++;
 184         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 185
 186         if (s->cert == NULL)
 187                 {
 188                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 189                 return(-1);
 190                 }
 191
 192         for (;;)
 193                 {
 194                 state=s->state;
 195
 196                 switch (s->state)
 197                         {
 198                 case SSL_ST_RENEGOTIATE:
 199                         s->new_session=1;
 200                         /* s->state=SSL_ST_ACCEPT; */
 201
 202                 case SSL_ST_BEFORE:
 203                 case SSL_ST_ACCEPT:
 204                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 205                 case SSL_ST_OK|SSL_ST_ACCEPT:
 206
 207                         s->server=1;
 208                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 209
 210                         if ((s->version>>8) != 3)
 211                                 {
 212                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 213                                 return -1;
 214                                 }
 215                         s->type=SSL_ST_ACCEPT;
 216
 217                         if (s->init_buf == NULL)
 218                                 {
 219                                 if ((buf=BUF_MEM_new()) == NULL)
 220                                         {
 221                                         ret= -1;
 222                                         goto end;
 223                                         }
 224                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 225                                         {
 226                                         ret= -1;
 227                                         goto end;
 228                                         }
 229                                 s->init_buf=buf;
 230                                 }
 231
 232                         if (!ssl3_setup_buffers(s))
 233                                 {
 234                                 ret= -1;
 235                                 goto end;
 236                                 }
 237
 238                         s->init_num=0;
 239
 240                         if (s->state != SSL_ST_RENEGOTIATE)
 241                                 {
 242                                 /* Ok, we now need to push on a buffering BIO so that
 243                                  * the output is sent in a way that TCP likes :-)
 244                                  */
 245                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 246
 247                                 ssl3_init_finished_mac(s);
 248                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 249                                 s->ctx->stats.sess_accept++;
 250                                 }
 251                         else
 252                                 {
 253                                 /* s->state == SSL_ST_RENEGOTIATE,
 254                                  * we will just send a HelloRequest */
 255                                 s->ctx->stats.sess_accept_renegotiate++;
 256                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 257                                 }
 258                         break;
 259
 260                 case SSL3_ST_SW_HELLO_REQ_A:
 261                 case SSL3_ST_SW_HELLO_REQ_B:
 262
 263                         s->shutdown=0;
 264                         ret=ssl3_send_hello_request(s);
 265                         if (ret <= 0) goto end;
 266                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 267                         s->state=SSL3_ST_SW_FLUSH;
 268                         s->init_num=0;
 269
 270                         ssl3_init_finished_mac(s);
 271                         break;
 272
 273                 case SSL3_ST_SW_HELLO_REQ_C:
 274                         s->state=SSL_ST_OK;
 275                         break;
 276
 277                 case SSL3_ST_SR_CLNT_HELLO_A:
 278                 case SSL3_ST_SR_CLNT_HELLO_B:
 279                 case SSL3_ST_SR_CLNT_HELLO_C:
 280
 281                         s->shutdown=0;
 282                         ret=ssl3_get_client_hello(s);
 283                         if (ret <= 0) goto end;
 284                         s->new_session = 2;
 285                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 286                         s->init_num=0;
 287                         break;
 288
 289                 case SSL3_ST_SW_SRVR_HELLO_A:
 290                 case SSL3_ST_SW_SRVR_HELLO_B:
 291                         ret=ssl3_send_server_hello(s);
 292                         if (ret <= 0) goto end;
 293
 294                         if (s->hit)
 295                                 s->state=SSL3_ST_SW_CHANGE_A;
 296                         else
 297                                 s->state=SSL3_ST_SW_CERT_A;
 298                         s->init_num=0;
 299                         break;
 300
 301                 case SSL3_ST_SW_CERT_A:
 302                 case SSL3_ST_SW_CERT_B:
 303                         /* Check if it is anon DH or anon ECDH */
 304                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 305                                 {
 306                                 ret=ssl3_send_server_certificate(s);
 307                                 if (ret <= 0) goto end;
 308                                 }
 309                         else
 310                                 skip=1;
 311                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 312                         s->init_num=0;
 313                         break;
 314
 315                 case SSL3_ST_SW_KEY_EXCH_A:
 316                 case SSL3_ST_SW_KEY_EXCH_B:
 317                         l=s->s3->tmp.new_cipher->algorithms;
 318
 319                         /* clear this, it may get reset by
 320                          * send_server_key_exchange */
 321                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 322 #ifndef OPENSSL_NO_KRB5
 323                                 && !(l & SSL_KRB5)
 324 #endif /* OPENSSL_NO_KRB5 */
 325                                 )
 326                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 327                                  * even when forbidden by protocol specs
 328                                  * (handshake may fail as clients are not required to
 329                                  * be able to handle this) */
 330                                 s->s3->tmp.use_rsa_tmp=1;
 331                         else
 332                                 s->s3->tmp.use_rsa_tmp=0;
 333
 334
 335                         /* only send if a DH key exchange, fortezza or
 336                          * RSA but we have a sign only certificate
 337                          *
 338                          * For ECC ciphersuites, we send a serverKeyExchange
 339                          * message only if the cipher suite is either
 340                          * ECDH-anon or ECDHE. In other cases, the
 341                          * server certificate contains the server's
 342                          * public key for key exchange.
 343                          */
 344                         if (s->s3->tmp.use_rsa_tmp
 345                             || (l & SSL_kECDHE)
 346                             || (l & (SSL_DH|SSL_kFZA))
 347                             || ((l & SSL_kRSA)
 348                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 349                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 350                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 351                                         )
 352                                     )
 353                                 )
 354                             )
 355                                 {
 356                                 ret=ssl3_send_server_key_exchange(s);
 357                                 if (ret <= 0) goto end;
 358                                 }
 359                         else
 360                                 skip=1;
 361
 362                         s->state=SSL3_ST_SW_CERT_REQ_A;
 363                         s->init_num=0;
 364                         break;
 365
 366                 case SSL3_ST_SW_CERT_REQ_A:
 367                 case SSL3_ST_SW_CERT_REQ_B:
 368                         if (/* don't request cert unless asked for it: */
 369                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 370                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 371                                  * don't request cert during re-negotiation: */
 372                                 ((s->session->peer != NULL) &&
 373                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 374                                 /* never request cert in anonymous ciphersuites
 375                                  * (see section "Certificate request" in SSL 3 drafts
 376                                  * and in RFC 2246): */
 377                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 378                                  /* ... except when the application insists on verification
 379                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 380                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 381                                  /* never request cert in Kerberos ciphersuites */
 382                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 383                                 {
 384                                 /* no cert request */
 385                                 skip=1;
 386                                 s->s3->tmp.cert_request=0;
 387                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 388                                 }
 389                         else
 390                                 {
 391                                 s->s3->tmp.cert_request=1;
 392                                 ret=ssl3_send_certificate_request(s);
 393                                 if (ret <= 0) goto end;
 394 #ifndef NETSCAPE_HANG_BUG
 395                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 396 #else
 397                                 s->state=SSL3_ST_SW_FLUSH;
 398                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 399 #endif
 400                                 s->init_num=0;
 401                                 }
 402                         break;
 403
 404                 case SSL3_ST_SW_SRVR_DONE_A:
 405                 case SSL3_ST_SW_SRVR_DONE_B:
 406                         ret=ssl3_send_server_done(s);
 407                         if (ret <= 0) goto end;
 408                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 409                         s->state=SSL3_ST_SW_FLUSH;
 410                         s->init_num=0;
 411                         break;
 412
 413                 case SSL3_ST_SW_FLUSH:
 414                         /* number of bytes to be flushed */
 415                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 416                         if (num1 > 0)
 417                                 {
 418                                 s->rwstate=SSL_WRITING;
 419                                 num1=BIO_flush(s->wbio);
 420                                 if (num1 <= 0) { ret= -1; goto end; }
 421                                 s->rwstate=SSL_NOTHING;
 422                                 }
 423
 424                         s->state=s->s3->tmp.next_state;
 425                         break;
 426
 427                 case SSL3_ST_SR_CERT_A:
 428                 case SSL3_ST_SR_CERT_B:
 429                         /* Check for second client hello (MS SGC) */
 430                         ret = ssl3_check_client_hello(s);
 431                         if (ret <= 0)
 432                                 goto end;
 433                         if (ret == 2)
 434                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 435                         else {
 436                                 if (s->s3->tmp.cert_request)
 437                                         {
 438                                         ret=ssl3_get_client_certificate(s);
 439                                         if (ret <= 0) goto end;
 440                                         }
 441                                 s->init_num=0;
 442                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 443                         }
 444                         break;
 445
 446                 case SSL3_ST_SR_KEY_EXCH_A:
 447                 case SSL3_ST_SR_KEY_EXCH_B:
 448                         ret=ssl3_get_client_key_exchange(s);
 449                         if (ret <= 0)
 450                                 goto end;
 451                         if (ret == 2)
 452                                 {
 453                                 /* For the ECDH ciphersuites when
 454                                  * the client sends its ECDH pub key in
 455                                  * a certificate, the CertificateVerify
 456                                  * message is not sent.
 457                                  */
 458                                 s->state=SSL3_ST_SR_FINISHED_A;
 459                                 s->init_num = 0;
 460                                 }
 461                         else
 462                                 {
 463                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 464                                 s->init_num=0;
 465
 466                                 /* We need to get hashes here so if there is
 467                                  * a client cert, it can be verified
 468                                  */
 469                                 s->method->ssl3_enc->cert_verify_mac(s,
 470                                     &(s->s3->finish_dgst1),
 471                                     &(s->s3->tmp.cert_verify_md[0]));
 472                                 s->method->ssl3_enc->cert_verify_mac(s,
 473                                     &(s->s3->finish_dgst2),
 474                                     &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 475                                 }
 476                         break;
 477
 478                 case SSL3_ST_SR_CERT_VRFY_A:
 479                 case SSL3_ST_SR_CERT_VRFY_B:
 480
 481                         /* we should decide if we expected this one */
 482                         ret=ssl3_get_cert_verify(s);
 483                         if (ret <= 0) goto end;
 484
 485                         s->state=SSL3_ST_SR_FINISHED_A;
 486                         s->init_num=0;
 487                         break;
 488
 489                 case SSL3_ST_SR_FINISHED_A:
 490                 case SSL3_ST_SR_FINISHED_B:
 491                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 492                                 SSL3_ST_SR_FINISHED_B);
 493                         if (ret <= 0) goto end;
 494                         if (s->hit)
 495                                 s->state=SSL_ST_OK;
 496                         else
 497                                 s->state=SSL3_ST_SW_CHANGE_A;
 498                         s->init_num=0;
 499                         break;
 500
 501                 case SSL3_ST_SW_CHANGE_A:
 502                 case SSL3_ST_SW_CHANGE_B:
 503
 504                         s->session->cipher=s->s3->tmp.new_cipher;
 505                         if (!s->method->ssl3_enc->setup_key_block(s))
 506                                 { ret= -1; goto end; }
 507
 508                         ret=ssl3_send_change_cipher_spec(s,
 509                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 510
 511                         if (ret <= 0) goto end;
 512                         s->state=SSL3_ST_SW_FINISHED_A;
 513                         s->init_num=0;
 514
 515                         if (!s->method->ssl3_enc->change_cipher_state(s,
 516                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 517                                 {
 518                                 ret= -1;
 519                                 goto end;
 520                                 }
 521
 522                         break;
 523
 524                 case SSL3_ST_SW_FINISHED_A:
 525                 case SSL3_ST_SW_FINISHED_B:
 526                         ret=ssl3_send_finished(s,
 527                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 528                                 s->method->ssl3_enc->server_finished_label,
 529                                 s->method->ssl3_enc->server_finished_label_len);
 530                         if (ret <= 0) goto end;
 531                         s->state=SSL3_ST_SW_FLUSH;
 532                         if (s->hit)
 533                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 534                         else
 535                                 s->s3->tmp.next_state=SSL_ST_OK;
 536                         s->init_num=0;
 537                         break;
 538
 539                 case SSL_ST_OK:
 540                         /* clean a few things up */
 541                         ssl3_cleanup_key_block(s);
 542
 543                         BUF_MEM_free(s->init_buf);
 544                         s->init_buf=NULL;
 545
 546                         /* remove buffering on output */
 547                         ssl_free_wbio_buffer(s);
 548
 549                         s->init_num=0;
 550
 551                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 552                                 {
 553                                 /* actually not necessarily a 'new' session unless
 554                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 555
 556                                 s->new_session=0;
 557
 558                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 559
 560                                 s->ctx->stats.sess_accept_good++;
 561                                 /* s->server=1; */
 562                                 s->handshake_func=ssl3_accept;
 563
 564                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 565                                 }
 566
 567                         ret = 1;
 568                         goto end;
 569                         /* break; */
 570
 571                 default:
 572                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 573                         ret= -1;
 574                         goto end;
 575                         /* break; */
 576                         }
 577
 578                 if (!s->s3->tmp.reuse_message && !skip)
 579                         {
 580                         if (s->debug)
 581                                 {
 582                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 583                                         goto end;
 584                                 }
 585
 586
 587                         if ((cb != NULL) && (s->state != state))
 588                                 {
 589                                 new_state=s->state;
 590                                 s->state=state;
 591                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 592                                 s->state=new_state;
 593                                 }
 594                         }
 595                 skip=0;
 596                 }
 597 end:
 598         /* BIO_flush(s->wbio); */
 599
 600         s->in_handshake--;
 601         if (cb != NULL)
 602                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 603         return(ret);
 604         }
 605
 606 int ssl3_send_hello_request(SSL *s)
 607         {
 608         unsigned char *p;
 609
 610         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 611                 {
 612                 p=(unsigned char *)s->init_buf->data;
 613                 *(p++)=SSL3_MT_HELLO_REQUEST;
 614                 *(p++)=0;
 615                 *(p++)=0;
 616                 *(p++)=0;
 617
 618                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 619                 /* number of bytes to write */
 620                 s->init_num=4;
 621                 s->init_off=0;
 622                 }
 623
 624         /* SSL3_ST_SW_HELLO_REQ_B */
 625         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 626         }
 627
 628 int ssl3_check_client_hello(SSL *s)
 629         {
 630         int ok;
 631         long n;
 632
 633         /* this function is called when we really expect a Certificate message,
 634          * so permit appropriate message length */
 635         n=s->method->ssl_get_message(s,
 636                 SSL3_ST_SR_CERT_A,
 637                 SSL3_ST_SR_CERT_B,
 638                 -1,
 639                 s->max_cert_list,
 640                 &ok);
 641         if (!ok) return((int)n);
 642         s->s3->tmp.reuse_message = 1;
 643         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 644                 {
 645                 /* Throw away what we have done so far in the current handshake,
 646                  * which will now be aborted. (A full SSL_clear would be too much.)
 647                  * I hope that tmp.dh is the only thing that may need to be cleared
 648                  * when a handshake is not completed ... */
 649 #ifndef OPENSSL_NO_DH
 650                 if (s->s3->tmp.dh != NULL)
 651                         {
 652                         DH_free(s->s3->tmp.dh);
 653                         s->s3->tmp.dh = NULL;
 654                         }
 655 #endif
 656                 return 2;
 657                 }
 658         return 1;
 659 }
 660
 661 int ssl3_get_client_hello(SSL *s)
 662         {
 663         int i,j,ok,al,ret= -1;
 664         unsigned int cookie_len;
 665         long n;
 666         unsigned long id;
 667         unsigned char *p,*d,*q;
 668         SSL_CIPHER *c;
 669 #ifndef OPENSSL_NO_COMP
 670         SSL_COMP *comp=NULL;
 671 #endif
 672         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 673
 674         /* We do this so that we will respond with our native type.
 675          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 676          * This down switching should be handled by a different method.
 677          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 678          * TLSv1.
 679          */
 680         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 681                 {
 682                 s->first_packet=1;
 683                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 684                 }
 685         n=s->method->ssl_get_message(s,
 686                 SSL3_ST_SR_CLNT_HELLO_B,
 687                 SSL3_ST_SR_CLNT_HELLO_C,
 688                 SSL3_MT_CLIENT_HELLO,
 689                 SSL3_RT_MAX_PLAIN_LENGTH,
 690                 &ok);
 691
 692         if (!ok) return((int)n);
 693         d=p=(unsigned char *)s->init_msg;
 694
 695         /* use version from inside client hello, not from record header
 696          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 697         s->client_version=(((int)p[0])<<8)|(int)p[1];
 698         p+=2;
 699
 700         if (s->client_version < s->version)
 701                 {
 702                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 703                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 704                         {
 705                         /* similar to ssl3_get_record, send alert using remote version number */
 706                         s->version = s->client_version;
 707                         }
 708                 al = SSL_AD_PROTOCOL_VERSION;
 709                 goto f_err;
 710                 }
 711
 712         /* load the client random */
 713         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 714         p+=SSL3_RANDOM_SIZE;
 715
 716         /* get the session-id */
 717         j= *(p++);
 718
 719         s->hit=0;
 720         /* Versions before 0.9.7 always allow session reuse during renegotiation
 721          * (i.e. when s->new_session is true), option
 722          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
 723          * Maybe this optional behaviour should always have been the default,
 724          * but we cannot safely change the default behaviour (or new applications
 725          * might be written that become totally unsecure when compiled with
 726          * an earlier library version)
 727          */
 728         if (j == 0 || (s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 729                 {
 730                 if (!ssl_get_new_session(s,1))
 731                         goto err;
 732                 }
 733         else
 734                 {
 735                 i=ssl_get_prev_session(s,p,j);
 736                 if (i == 1)
 737                         { /* previous session */
 738                         s->hit=1;
 739                         }
 740                 else if (i == -1)
 741                         goto err;
 742                 else /* i == 0 */
 743                         {
 744                         if (!ssl_get_new_session(s,1))
 745                                 goto err;
 746                         }
 747                 }
 748
 749         p+=j;
 750
 751         if (SSL_version(s) == DTLS1_VERSION)
 752                 {
 753                 /* cookie stuff */
 754                 cookie_len = *(p++);
 755
 756                 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 757                         s->d1->send_cookie == 0)
 758                         {
 759                         /* HelloVerifyMessage has already been sent */
 760                         if ( cookie_len != s->d1->cookie_len)
 761                                 {
 762                                 al = SSL_AD_HANDSHAKE_FAILURE;
 763                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 764                                 goto f_err;
 765                                 }
 766                         }
 767
 768                 /*
 769                  * The ClientHello may contain a cookie even if the
 770                  * HelloVerify message has not been sent--make sure that it
 771                  * does not cause an overflow.
 772                  */
 773                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
 774                         {
 775                         /* too much data */
 776                         al = SSL_AD_DECODE_ERROR;
 777                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 778                         goto f_err;
 779                         }
 780
 781                 /* verify the cookie if appropriate option is set. */
 782                 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 783                         cookie_len > 0)
 784                         {
 785                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
 786
 787                         if ( s->ctx->app_verify_cookie_cb != NULL)
 788                                 {
 789                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
 790                                         cookie_len) == 0)
 791                                         {
 792                                         al=SSL_AD_HANDSHAKE_FAILURE;
 793                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 794                                                 SSL_R_COOKIE_MISMATCH);
 795                                         goto f_err;
 796                                         }
 797                                 /* else cookie verification succeeded */
 798                                 }
 799                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
 800                                                   s->d1->cookie_len) != 0) /* default verification */
 801                                 {
 802                                         al=SSL_AD_HANDSHAKE_FAILURE;
 803                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 804                                                 SSL_R_COOKIE_MISMATCH);
 805                                         goto f_err;
 806                                 }
 807                         }
 808
 809                 p += cookie_len;
 810                 }
 811
 812         n2s(p,i);
 813         if ((i == 0) && (j != 0))
 814                 {
 815                 /* we need a cipher if we are not resuming a session */
 816                 al=SSL_AD_ILLEGAL_PARAMETER;
 817                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 818                 goto f_err;
 819                 }
 820         if ((p+i) >= (d+n))
 821                 {
 822                 /* not enough data */
 823                 al=SSL_AD_DECODE_ERROR;
 824                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 825                 goto f_err;
 826                 }
 827         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 828                 == NULL))
 829                 {
 830                 goto err;
 831                 }
 832         p+=i;
 833
 834         /* If it is a hit, check that the cipher is in the list */
 835         if ((s->hit) && (i > 0))
 836                 {
 837                 j=0;
 838                 id=s->session->cipher->id;
 839
 840 #ifdef CIPHER_DEBUG
 841                 printf("client sent %d ciphers\n",sk_num(ciphers));
 842 #endif
 843                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 844                         {
 845                         c=sk_SSL_CIPHER_value(ciphers,i);
 846 #ifdef CIPHER_DEBUG
 847                         printf("client [%2d of %2d]:%s\n",
 848                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 849 #endif
 850                         if (c->id == id)
 851                                 {
 852                                 j=1;
 853                                 break;
 854                                 }
 855                         }
 856                 if (j == 0)
 857                         {
 858                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 859                                 {
 860                                 /* Very bad for multi-threading.... */
 861                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers, 0);
 862                                 }
 863                         else
 864                                 {
 865                                 /* we need to have the cipher in the cipher
 866                                  * list if we are asked to reuse it */
 867                                 al=SSL_AD_ILLEGAL_PARAMETER;
 868                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 869                                 goto f_err;
 870                                 }
 871                         }
 872                 }
 873
 874         /* compression */
 875         i= *(p++);
 876         if ((p+i) > (d+n))
 877                 {
 878                 /* not enough data */
 879                 al=SSL_AD_DECODE_ERROR;
 880                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 881                 goto f_err;
 882                 }
 883         q=p;
 884         for (j=0; j<i; j++)
 885                 {
 886                 if (p[j] == 0) break;
 887                 }
 888
 889         p+=i;
 890         if (j >= i)
 891                 {
 892                 /* no compress */
 893                 al=SSL_AD_DECODE_ERROR;
 894                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 895                 goto f_err;
 896                 }
 897
 898         /* Worst case, we will use the NULL compression, but if we have other
 899          * options, we will now look for them.  We have i-1 compression
 900          * algorithms from the client, starting at q. */
 901         s->s3->tmp.new_compression=NULL;
 902 #ifndef OPENSSL_NO_COMP
 903         if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
 904                 { /* See if we have a match */
 905                 int m,nn,o,v,done=0;
 906
 907                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
 908                 for (m=0; m<nn; m++)
 909                         {
 910                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
 911                         v=comp->id;
 912                         for (o=0; o<i; o++)
 913                                 {
 914                                 if (v == q[o])
 915                                         {
 916                                         done=1;
 917                                         break;
 918                                         }
 919                                 }
 920                         if (done) break;
 921                         }
 922                 if (done)
 923                         s->s3->tmp.new_compression=comp;
 924                 else
 925                         comp=NULL;
 926                 }
 927 #endif
 928
 929         /* TLS does not mind if there is extra stuff */
 930 #if 0   /* SSL 3.0 does not mind either, so we should disable this test
 931          * (was enabled in 0.9.6d through 0.9.6j and 0.9.7 through 0.9.7b,
 932          * in earlier SSLeay/OpenSSL releases this test existed but was buggy) */
 933         if (s->version == SSL3_VERSION)
 934                 {
 935                 if (p < (d+n))
 936                         {
 937                         /* wrong number of bytes,
 938                          * there could be more to follow */
 939                         al=SSL_AD_DECODE_ERROR;
 940                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 941                         goto f_err;
 942                         }
 943                 }
 944 #endif
 945
 946         /* Given s->session->ciphers and SSL_get_ciphers, we must
 947          * pick a cipher */
 948
 949         if (!s->hit)
 950                 {
 951 #ifdef OPENSSL_NO_COMP
 952                 s->session->compress_meth=0;
 953 #else
 954                 s->session->compress_meth=(comp == NULL)?0:comp->id;
 955 #endif
 956                 if (s->session->ciphers != NULL)
 957                         sk_SSL_CIPHER_free(s->session->ciphers);
 958                 s->session->ciphers=ciphers;
 959                 if (ciphers == NULL)
 960                         {
 961                         al=SSL_AD_ILLEGAL_PARAMETER;
 962                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 963                         goto f_err;
 964                         }
 965                 ciphers=NULL;
 966                 c=ssl3_choose_cipher(s,s->session->ciphers,
 967                                      SSL_get_ciphers(s));
 968
 969                 if (c == NULL)
 970                         {
 971                         al=SSL_AD_HANDSHAKE_FAILURE;
 972                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 973                         goto f_err;
 974                         }
 975                 s->s3->tmp.new_cipher=c;
 976                 }
 977         else
 978                 {
 979                 /* Session-id reuse */
 980 #ifdef REUSE_CIPHER_BUG
 981                 STACK_OF(SSL_CIPHER) *sk;
 982                 SSL_CIPHER *nc=NULL;
 983                 SSL_CIPHER *ec=NULL;
 984
 985                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 986                         {
 987                         sk=s->session->ciphers;
 988                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
 989                                 {
 990                                 c=sk_SSL_CIPHER_value(sk,i);
 991                                 if (c->algorithms & SSL_eNULL)
 992                                         nc=c;
 993                                 if (SSL_C_IS_EXPORT(c))
 994                                         ec=c;
 995                                 }
 996                         if (nc != NULL)
 997                                 s->s3->tmp.new_cipher=nc;
 998                         else if (ec != NULL)
 999                                 s->s3->tmp.new_cipher=ec;
1000                         else
1001                                 s->s3->tmp.new_cipher=s->session->cipher;
1002                         }
1003                 else
1004 #endif
1005                 s->s3->tmp.new_cipher=s->session->cipher;
1006                 }
1007
1008         /* we now have the following setup.
1009          * client_random
1010          * cipher_list          - our prefered list of ciphers
1011          * ciphers              - the clients prefered list of ciphers
1012          * compression          - basically ignored right now
1013          * ssl version is set   - sslv3
1014          * s->session           - The ssl session has been setup.
1015          * s->hit               - session reuse flag
1016          * s->tmp.new_cipher    - the new cipher to use.
1017          */
1018
1019         ret=1;
1020         if (0)
1021                 {
1022 f_err:
1023                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1024                 }
1025 err:
1026         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1027         return(ret);
1028         }
1029
1030 int ssl3_send_server_hello(SSL *s)
1031         {
1032         unsigned char *buf;
1033         unsigned char *p,*d;
1034         int i,sl;
1035         unsigned long l,Time;
1036
1037         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1038                 {
1039                 buf=(unsigned char *)s->init_buf->data;
1040                 p=s->s3->server_random;
1041                 Time=time(NULL);                        /* Time */
1042                 l2n(Time,p);
1043                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1044                         return -1;
1045                 /* Do the message type and length last */
1046                 d=p= &(buf[4]);
1047
1048                 *(p++)=s->version>>8;
1049                 *(p++)=s->version&0xff;
1050
1051                 /* Random stuff */
1052                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1053                 p+=SSL3_RANDOM_SIZE;
1054
1055                 /* now in theory we have 3 options to sending back the
1056                  * session id.  If it is a re-use, we send back the
1057                  * old session-id, if it is a new session, we send
1058                  * back the new session-id or we send back a 0 length
1059                  * session-id if we want it to be single use.
1060                  * Currently I will not implement the '0' length session-id
1061                  * 12-Jan-98 - I'll now support the '0' length stuff.
1062                  */
1063                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
1064                         s->session->session_id_length=0;
1065
1066                 sl=s->session->session_id_length;
1067                 if (sl > (int)sizeof(s->session->session_id))
1068                         {
1069                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1070                         return -1;
1071                         }
1072                 *(p++)=sl;
1073                 memcpy(p,s->session->session_id,sl);
1074                 p+=sl;
1075
1076                 /* put the cipher */
1077                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1078                 p+=i;
1079
1080                 /* put the compression method */
1081 #ifdef OPENSSL_NO_COMP
1082                         *(p++)=0;
1083 #else
1084                 if (s->s3->tmp.new_compression == NULL)
1085                         *(p++)=0;
1086                 else
1087                         *(p++)=s->s3->tmp.new_compression->id;
1088 #endif
1089
1090                 /* do the header */
1091                 l=(p-d);
1092                 d=buf;
1093                 *(d++)=SSL3_MT_SERVER_HELLO;
1094                 l2n3(l,d);
1095
1096                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
1097                 /* number of bytes to write */
1098                 s->init_num=p-buf;
1099                 s->init_off=0;
1100                 }
1101
1102         /* SSL3_ST_CW_CLNT_HELLO_B */
1103         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1104         }
1105
1106 int ssl3_send_server_done(SSL *s)
1107         {
1108         unsigned char *p;
1109
1110         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1111                 {
1112                 p=(unsigned char *)s->init_buf->data;
1113
1114                 /* do the header */
1115                 *(p++)=SSL3_MT_SERVER_DONE;
1116                 *(p++)=0;
1117                 *(p++)=0;
1118                 *(p++)=0;
1119
1120                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1121                 /* number of bytes to write */
1122                 s->init_num=4;
1123                 s->init_off=0;
1124                 }
1125
1126         /* SSL3_ST_CW_CLNT_HELLO_B */
1127         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1128         }
1129
1130 int ssl3_send_server_key_exchange(SSL *s)
1131         {
1132 #ifndef OPENSSL_NO_RSA
1133         unsigned char *q;
1134         int j,num;
1135         RSA *rsa;
1136         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1137         unsigned int u;
1138 #endif
1139 #ifndef OPENSSL_NO_DH
1140         DH *dh=NULL,*dhp;
1141 #endif
1142 #ifndef OPENSSL_NO_ECDH
1143         EC_KEY *ecdh=NULL, *ecdhp;
1144         unsigned char *encodedPoint = NULL;
1145         int encodedlen = 0;
1146         int curve_id = 0;
1147         BN_CTX *bn_ctx = NULL;
1148 #endif
1149         EVP_PKEY *pkey;
1150         unsigned char *p,*d;
1151         int al,i;
1152         unsigned long type;
1153         int n;
1154         CERT *cert;
1155         BIGNUM *r[4];
1156         int nr[4],kn;
1157         BUF_MEM *buf;
1158         EVP_MD_CTX md_ctx;
1159
1160         EVP_MD_CTX_init(&md_ctx);
1161         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1162                 {
1163                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1164                 cert=s->cert;
1165
1166                 buf=s->init_buf;
1167
1168                 r[0]=r[1]=r[2]=r[3]=NULL;
1169                 n=0;
1170 #ifndef OPENSSL_NO_RSA
1171                 if (type & SSL_kRSA)
1172                         {
1173                         rsa=cert->rsa_tmp;
1174                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1175                                 {
1176                                 rsa=s->cert->rsa_tmp_cb(s,
1177                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1178                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1179                                 if(rsa == NULL)
1180                                 {
1181                                         al=SSL_AD_HANDSHAKE_FAILURE;
1182                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1183                                         goto f_err;
1184                                 }
1185                                 RSA_up_ref(rsa);
1186                                 cert->rsa_tmp=rsa;
1187                                 }
1188                         if (rsa == NULL)
1189                                 {
1190                                 al=SSL_AD_HANDSHAKE_FAILURE;
1191                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1192                                 goto f_err;
1193                                 }
1194                         r[0]=rsa->n;
1195                         r[1]=rsa->e;
1196                         s->s3->tmp.use_rsa_tmp=1;
1197                         }
1198                 else
1199 #endif
1200 #ifndef OPENSSL_NO_DH
1201                         if (type & SSL_kEDH)
1202                         {
1203                         dhp=cert->dh_tmp;
1204                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1205                                 dhp=s->cert->dh_tmp_cb(s,
1206                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1207                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1208                         if (dhp == NULL)
1209                                 {
1210                                 al=SSL_AD_HANDSHAKE_FAILURE;
1211                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1212                                 goto f_err;
1213                                 }
1214
1215                         if (s->s3->tmp.dh != NULL)
1216                                 {
1217                                 DH_free(dh);
1218                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1219                                 goto err;
1220                                 }
1221
1222                         if ((dh=DHparams_dup(dhp)) == NULL)
1223                                 {
1224                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1225                                 goto err;
1226                                 }
1227
1228                         s->s3->tmp.dh=dh;
1229                         if ((dhp->pub_key == NULL ||
1230                              dhp->priv_key == NULL ||
1231                              (s->options & SSL_OP_SINGLE_DH_USE)))
1232                                 {
1233                                 if(!DH_generate_key(dh))
1234                                     {
1235                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1236                                            ERR_R_DH_LIB);
1237                                     goto err;
1238                                     }
1239                                 }
1240                         else
1241                                 {
1242                                 dh->pub_key=BN_dup(dhp->pub_key);
1243                                 dh->priv_key=BN_dup(dhp->priv_key);
1244                                 if ((dh->pub_key == NULL) ||
1245                                         (dh->priv_key == NULL))
1246                                         {
1247                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1248                                         goto err;
1249                                         }
1250                                 }
1251                         r[0]=dh->p;
1252                         r[1]=dh->g;
1253                         r[2]=dh->pub_key;
1254                         }
1255                 else
1256 #endif
1257 #ifndef OPENSSL_NO_ECDH
1258                         if (type & SSL_kECDHE)
1259                         {
1260                         const EC_GROUP *group;
1261
1262                         ecdhp=cert->ecdh_tmp;
1263                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1264                                 {
1265                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1266                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1267                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1268                                 }
1269                         if (ecdhp == NULL)
1270                                 {
1271                                 al=SSL_AD_HANDSHAKE_FAILURE;
1272                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1273                                 goto f_err;
1274                                 }
1275
1276                         if (s->s3->tmp.ecdh != NULL)
1277                                 {
1278                                 EC_KEY_free(s->s3->tmp.ecdh);
1279                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1280                                 goto err;
1281                                 }
1282
1283                         /* Duplicate the ECDH structure. */
1284                         if (ecdhp == NULL)
1285                                 {
1286                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1287                                 goto err;
1288                                 }
1289                         if (!EC_KEY_up_ref(ecdhp))
1290                                 {
1291                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1292                                 goto err;
1293                                 }
1294                         ecdh = ecdhp;
1295
1296                         s->s3->tmp.ecdh=ecdh;
1297                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1298                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1299                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1300                                 {
1301                                 if(!EC_KEY_generate_key(ecdh))
1302                                     {
1303                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1304                                     goto err;
1305                                     }
1306                                 }
1307
1308                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1309                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1310                             (EC_KEY_get0_private_key(ecdh) == NULL))
1311                                 {
1312                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1313                                 goto err;
1314                                 }
1315
1316                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1317                             (EC_GROUP_get_degree(group) > 163))
1318                                 {
1319                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1320                                 goto err;
1321                                 }
1322
1323                         /* XXX: For now, we only support ephemeral ECDH
1324                          * keys over named (not generic) curves. For
1325                          * supported named curves, curve_id is non-zero.
1326                          */
1327                         if ((curve_id =
1328                             nid2curve_id(EC_GROUP_get_curve_name(group)))
1329                             == 0)
1330                                 {
1331                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1332                                 goto err;
1333                                 }
1334
1335                         /* Encode the public key.
1336                          * First check the size of encoding and
1337                          * allocate memory accordingly.
1338                          */
1339                         encodedlen = EC_POINT_point2oct(group,
1340                             EC_KEY_get0_public_key(ecdh),
1341                             POINT_CONVERSION_UNCOMPRESSED,
1342                             NULL, 0, NULL);
1343
1344                         encodedPoint = (unsigned char *)
1345                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1346                         bn_ctx = BN_CTX_new();
1347                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1348                                 {
1349                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1350                                 goto err;
1351                                 }
1352
1353
1354                         encodedlen = EC_POINT_point2oct(group,
1355                             EC_KEY_get0_public_key(ecdh),
1356                             POINT_CONVERSION_UNCOMPRESSED,
1357                             encodedPoint, encodedlen, bn_ctx);
1358
1359                         if (encodedlen == 0)
1360                                 {
1361                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1362                                 goto err;
1363                                 }
1364
1365                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1366
1367                         /* XXX: For now, we only support named (not
1368                          * generic) curves in ECDH ephemeral key exchanges.
1369                          * In this situation, we need three additional bytes
1370                          * to encode the entire ServerECDHParams
1371                          * structure.
1372                          */
1373                         n = 3 + encodedlen;
1374
1375                         /* We'll generate the serverKeyExchange message
1376                          * explicitly so we can set these to NULLs
1377                          */
1378                         r[0]=NULL;
1379                         r[1]=NULL;
1380                         r[2]=NULL;
1381                         }
1382                 else
1383 #endif /* !OPENSSL_NO_ECDH */
1384                         {
1385                         al=SSL_AD_HANDSHAKE_FAILURE;
1386                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1387                         goto f_err;
1388                         }
1389                 for (i=0; r[i] != NULL; i++)
1390                         {
1391                         nr[i]=BN_num_bytes(r[i]);
1392                         n+=2+nr[i];
1393                         }
1394
1395                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1396                         {
1397                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1398                                 == NULL)
1399                                 {
1400                                 al=SSL_AD_DECODE_ERROR;
1401                                 goto f_err;
1402                                 }
1403                         kn=EVP_PKEY_size(pkey);
1404                         }
1405                 else
1406                         {
1407                         pkey=NULL;
1408                         kn=0;
1409                         }
1410
1411                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1412                         {
1413                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1414                         goto err;
1415                         }
1416                 d=(unsigned char *)s->init_buf->data;
1417                 p= &(d[4]);
1418
1419                 for (i=0; r[i] != NULL; i++)
1420                         {
1421                         s2n(nr[i],p);
1422                         BN_bn2bin(r[i],p);
1423                         p+=nr[i];
1424                         }
1425
1426 #ifndef OPENSSL_NO_ECDH
1427                 if (type & SSL_kECDHE)
1428                         {
1429                         /* XXX: For now, we only support named (not generic) curves.
1430                          * In this situation, the serverKeyExchange message has:
1431                          * [1 byte CurveType], [1 byte CurveName]
1432                          * [1 byte length of encoded point], followed by
1433                          * the actual encoded point itself
1434                          */
1435                         *p = NAMED_CURVE_TYPE;
1436                         p += 1;
1437                         *p = curve_id;
1438                         p += 1;
1439                         *p = encodedlen;
1440                         p += 1;
1441                         memcpy((unsigned char*)p,
1442                             (unsigned char *)encodedPoint,
1443                             encodedlen);
1444                         OPENSSL_free(encodedPoint);
1445                         p += encodedlen;
1446                         }
1447 #endif
1448
1449                 /* not anonymous */
1450                 if (pkey != NULL)
1451                         {
1452                         /* n is the length of the params, they start at &(d[4])
1453                          * and p points to the space at the end. */
1454 #ifndef OPENSSL_NO_RSA
1455                         if (pkey->type == EVP_PKEY_RSA)
1456                                 {
1457                                 q=md_buf;
1458                                 j=0;
1459                                 for (num=2; num > 0; num--)
1460                                         {
1461                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1462                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1463                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1464                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1465                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1466                                         EVP_DigestFinal_ex(&md_ctx,q,
1467                                                 (unsigned int *)&i);
1468                                         q+=i;
1469                                         j+=i;
1470                                         }
1471                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1472                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1473                                         {
1474                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1475                                         goto err;
1476                                         }
1477                                 s2n(u,p);
1478                                 n+=u+2;
1479                                 }
1480                         else
1481 #endif
1482 #if !defined(OPENSSL_NO_DSA)
1483                                 if (pkey->type == EVP_PKEY_DSA)
1484                                 {
1485                                 /* lets do DSS */
1486                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1487                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1488                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1489                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1490                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1491                                         (unsigned int *)&i,pkey))
1492                                         {
1493                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1494                                         goto err;
1495                                         }
1496                                 s2n(i,p);
1497                                 n+=i+2;
1498                                 }
1499                         else
1500 #endif
1501 #if !defined(OPENSSL_NO_ECDSA)
1502                                 if (pkey->type == EVP_PKEY_EC)
1503                                 {
1504                                 /* let's do ECDSA */
1505                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1506                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1507                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1508                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1509                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1510                                         (unsigned int *)&i,pkey))
1511                                         {
1512                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1513                                         goto err;
1514                                         }
1515                                 s2n(i,p);
1516                                 n+=i+2;
1517                                 }
1518                         else
1519 #endif
1520                                 {
1521                                 /* Is this error check actually needed? */
1522                                 al=SSL_AD_HANDSHAKE_FAILURE;
1523                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1524                                 goto f_err;
1525                                 }
1526                         }
1527
1528                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1529                 l2n3(n,d);
1530
1531                 /* we should now have things packed up, so lets send
1532                  * it off */
1533                 s->init_num=n+4;
1534                 s->init_off=0;
1535                 }
1536
1537         s->state = SSL3_ST_SW_KEY_EXCH_B;
1538         EVP_MD_CTX_cleanup(&md_ctx);
1539         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1540 f_err:
1541         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1542 err:
1543 #ifndef OPENSSL_NO_ECDH
1544         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1545         BN_CTX_free(bn_ctx);
1546 #endif
1547         EVP_MD_CTX_cleanup(&md_ctx);
1548         return(-1);
1549         }
1550
1551 int ssl3_send_certificate_request(SSL *s)
1552         {
1553         unsigned char *p,*d;
1554         int i,j,nl,off,n;
1555         STACK_OF(X509_NAME) *sk=NULL;
1556         X509_NAME *name;
1557         BUF_MEM *buf;
1558
1559         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1560                 {
1561                 buf=s->init_buf;
1562
1563                 d=p=(unsigned char *)&(buf->data[4]);
1564
1565                 /* get the list of acceptable cert types */
1566                 p++;
1567                 n=ssl3_get_req_cert_type(s,p);
1568                 d[0]=n;
1569                 p+=n;
1570                 n++;
1571
1572                 off=n;
1573                 p+=2;
1574                 n+=2;
1575
1576                 sk=SSL_get_client_CA_list(s);
1577                 nl=0;
1578                 if (sk != NULL)
1579                         {
1580                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1581                                 {
1582                                 name=sk_X509_NAME_value(sk,i);
1583                                 j=i2d_X509_NAME(name,NULL);
1584                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1585                                         {
1586                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1587                                         goto err;
1588                                         }
1589                                 p=(unsigned char *)&(buf->data[4+n]);
1590                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1591                                         {
1592                                         s2n(j,p);
1593                                         i2d_X509_NAME(name,&p);
1594                                         n+=2+j;
1595                                         nl+=2+j;
1596                                         }
1597                                 else
1598                                         {
1599                                         d=p;
1600                                         i2d_X509_NAME(name,&p);
1601                                         j-=2; s2n(j,d); j+=2;
1602                                         n+=j;
1603                                         nl+=j;
1604                                         }
1605                                 }
1606                         }
1607                 /* else no CA names */
1608                 p=(unsigned char *)&(buf->data[4+off]);
1609                 s2n(nl,p);
1610
1611                 d=(unsigned char *)buf->data;
1612                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1613                 l2n3(n,d);
1614
1615                 /* we should now have things packed up, so lets send
1616                  * it off */
1617
1618                 s->init_num=n+4;
1619                 s->init_off=0;
1620 #ifdef NETSCAPE_HANG_BUG
1621                 p=(unsigned char *)s->init_buf->data + s->init_num;
1622
1623                 /* do the header */
1624                 *(p++)=SSL3_MT_SERVER_DONE;
1625                 *(p++)=0;
1626                 *(p++)=0;
1627                 *(p++)=0;
1628                 s->init_num += 4;
1629 #endif
1630
1631                 s->state = SSL3_ST_SW_CERT_REQ_B;
1632                 }
1633
1634         /* SSL3_ST_SW_CERT_REQ_B */
1635         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1636 err:
1637         return(-1);
1638         }
1639
1640
1641 #ifndef OPENSSL_NO_ECDH
1642 static const int KDF1_SHA1_len = 20;
1643 static void *KDF1_SHA1(const void *in, size_t inlen, void *out, size_t *outlen)
1644         {
1645 #ifndef OPENSSL_NO_SHA
1646         if (*outlen < SHA_DIGEST_LENGTH)
1647                 return NULL;
1648         else
1649                 *outlen = SHA_DIGEST_LENGTH;
1650         return SHA1(in, inlen, out);
1651 #else
1652         return NULL;
1653 #endif  /* OPENSSL_NO_SHA */
1654         }
1655 #endif  /* OPENSSL_NO_ECDH */
1656
1657 int ssl3_get_client_key_exchange(SSL *s)
1658         {
1659         int i,al,ok;
1660         long n;
1661         unsigned long l;
1662         unsigned char *p;
1663 #ifndef OPENSSL_NO_RSA
1664         RSA *rsa=NULL;
1665         EVP_PKEY *pkey=NULL;
1666 #endif
1667 #ifndef OPENSSL_NO_DH
1668         BIGNUM *pub=NULL;
1669         DH *dh_srvr;
1670 #endif
1671 #ifndef OPENSSL_NO_KRB5
1672         KSSL_ERR kssl_err;
1673 #endif /* OPENSSL_NO_KRB5 */
1674
1675 #ifndef OPENSSL_NO_ECDH
1676         EC_KEY *srvr_ecdh = NULL;
1677         EVP_PKEY *clnt_pub_pkey = NULL;
1678         EC_POINT *clnt_ecpoint = NULL;
1679         BN_CTX *bn_ctx = NULL;
1680 #endif
1681
1682         n=s->method->ssl_get_message(s,
1683                 SSL3_ST_SR_KEY_EXCH_A,
1684                 SSL3_ST_SR_KEY_EXCH_B,
1685                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1686                 2048, /* ??? */
1687                 &ok);
1688
1689         if (!ok) return((int)n);
1690         p=(unsigned char *)s->init_msg;
1691
1692         l=s->s3->tmp.new_cipher->algorithms;
1693
1694 #ifndef OPENSSL_NO_RSA
1695         if (l & SSL_kRSA)
1696                 {
1697                 /* FIX THIS UP EAY EAY EAY EAY */
1698                 if (s->s3->tmp.use_rsa_tmp)
1699                         {
1700                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1701                                 rsa=s->cert->rsa_tmp;
1702                         /* Don't do a callback because rsa_tmp should
1703                          * be sent already */
1704                         if (rsa == NULL)
1705                                 {
1706                                 al=SSL_AD_HANDSHAKE_FAILURE;
1707                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1708                                 goto f_err;
1709
1710                                 }
1711                         }
1712                 else
1713                         {
1714                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1715                         if (    (pkey == NULL) ||
1716                                 (pkey->type != EVP_PKEY_RSA) ||
1717                                 (pkey->pkey.rsa == NULL))
1718                                 {
1719                                 al=SSL_AD_HANDSHAKE_FAILURE;
1720                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1721                                 goto f_err;
1722                                 }
1723                         rsa=pkey->pkey.rsa;
1724                         }
1725
1726                 /* TLS */
1727                 if (s->version > SSL3_VERSION)
1728                         {
1729                         n2s(p,i);
1730                         if (n != i+2)
1731                                 {
1732                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1733                                         {
1734                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1735                                         goto err;
1736                                         }
1737                                 else
1738                                         p-=2;
1739                                 }
1740                         else
1741                                 n=i;
1742                         }
1743
1744                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1745
1746                 al = -1;
1747
1748                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1749                         {
1750                         al=SSL_AD_DECODE_ERROR;
1751                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
1752                         }
1753
1754                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1755                         {
1756                         /* The premaster secret must contain the same version number as the
1757                          * ClientHello to detect version rollback attacks (strangely, the
1758                          * protocol does not offer such protection for DH ciphersuites).
1759                          * However, buggy clients exist that send the negotiated protocol
1760                          * version instead if the server does not support the requested
1761                          * protocol version.
1762                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1763                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1764                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1765                                 {
1766                                 al=SSL_AD_DECODE_ERROR;
1767                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1768
1769                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1770                                  * (http://eprint.iacr.org/2003/052/) exploits the version
1771                                  * number check as a "bad version oracle" -- an alert would
1772                                  * reveal that the plaintext corresponding to some ciphertext
1773                                  * made up by the adversary is properly formatted except
1774                                  * that the version number is wrong.  To avoid such attacks,
1775                                  * we should treat this just like any other decryption error. */
1776                                 }
1777                         }
1778
1779                 if (al != -1)
1780                         {
1781                         /* Some decryption failure -- use random value instead as countermeasure
1782                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1783                          * (see RFC 2246, section 7.4.7.1). */
1784                         ERR_clear_error();
1785                         i = SSL_MAX_MASTER_KEY_LENGTH;
1786                         p[0] = s->client_version >> 8;
1787                         p[1] = s->client_version & 0xff;
1788                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
1789                                 goto err;
1790                         }
1791
1792                 s->session->master_key_length=
1793                         s->method->ssl3_enc->generate_master_secret(s,
1794                                 s->session->master_key,
1795                                 p,i);
1796                 OPENSSL_cleanse(p,i);
1797                 }
1798         else
1799 #endif
1800 #ifndef OPENSSL_NO_DH
1801                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1802                 {
1803                 n2s(p,i);
1804                 if (n != i+2)
1805                         {
1806                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1807                                 {
1808                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1809                                 goto err;
1810                                 }
1811                         else
1812                                 {
1813                                 p-=2;
1814                                 i=(int)n;
1815                                 }
1816                         }
1817
1818                 if (n == 0L) /* the parameters are in the cert */
1819                         {
1820                         al=SSL_AD_HANDSHAKE_FAILURE;
1821                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1822                         goto f_err;
1823                         }
1824                 else
1825                         {
1826                         if (s->s3->tmp.dh == NULL)
1827                                 {
1828                                 al=SSL_AD_HANDSHAKE_FAILURE;
1829                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1830                                 goto f_err;
1831                                 }
1832                         else
1833                                 dh_srvr=s->s3->tmp.dh;
1834                         }
1835
1836                 pub=BN_bin2bn(p,i,NULL);
1837                 if (pub == NULL)
1838                         {
1839                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1840                         goto err;
1841                         }
1842
1843                 i=DH_compute_key(p,pub,dh_srvr);
1844
1845                 if (i <= 0)
1846                         {
1847                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1848                         goto err;
1849                         }
1850
1851                 DH_free(s->s3->tmp.dh);
1852                 s->s3->tmp.dh=NULL;
1853
1854                 BN_clear_free(pub);
1855                 pub=NULL;
1856                 s->session->master_key_length=
1857                         s->method->ssl3_enc->generate_master_secret(s,
1858                                 s->session->master_key,p,i);
1859                 OPENSSL_cleanse(p,i);
1860                 }
1861         else
1862 #endif
1863 #ifndef OPENSSL_NO_KRB5
1864         if (l & SSL_kKRB5)
1865                 {
1866                 krb5_error_code         krb5rc;
1867                 krb5_data               enc_ticket;
1868                 krb5_data               authenticator;
1869                 krb5_data               enc_pms;
1870                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
1871                 EVP_CIPHER_CTX          ciph_ctx;
1872                 EVP_CIPHER              *enc = NULL;
1873                 unsigned char           iv[EVP_MAX_IV_LENGTH];
1874                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
1875                                                + EVP_MAX_BLOCK_LENGTH];
1876                 int                     padl, outl;
1877                 krb5_timestamp          authtime = 0;
1878                 krb5_ticket_times       ttimes;
1879
1880                 EVP_CIPHER_CTX_init(&ciph_ctx);
1881
1882                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
1883
1884                 n2s(p,i);
1885                 enc_ticket.length = i;
1886
1887                 if (n < enc_ticket.length + 6)
1888                         {
1889                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1890                                 SSL_R_DATA_LENGTH_TOO_LONG);
1891                         goto err;
1892                         }
1893
1894                 enc_ticket.data = (char *)p;
1895                 p+=enc_ticket.length;
1896
1897                 n2s(p,i);
1898                 authenticator.length = i;
1899
1900                 if (n < enc_ticket.length + authenticator.length + 6)
1901                         {
1902                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1903                                 SSL_R_DATA_LENGTH_TOO_LONG);
1904                         goto err;
1905                         }
1906
1907                 authenticator.data = (char *)p;
1908                 p+=authenticator.length;
1909
1910                 n2s(p,i);
1911                 enc_pms.length = i;
1912                 enc_pms.data = (char *)p;
1913                 p+=enc_pms.length;
1914
1915                 /* Note that the length is checked again below,
1916                 ** after decryption
1917                 */
1918                 if(enc_pms.length > sizeof pms)
1919                         {
1920                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1921                                SSL_R_DATA_LENGTH_TOO_LONG);
1922                         goto err;
1923                         }
1924
1925                 if (n != (long)(enc_ticket.length + authenticator.length +
1926                                                 enc_pms.length + 6))
1927                         {
1928                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1929                                 SSL_R_DATA_LENGTH_TOO_LONG);
1930                         goto err;
1931                         }
1932
1933                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
1934                                         &kssl_err)) != 0)
1935                         {
1936 #ifdef KSSL_DEBUG
1937                         printf("kssl_sget_tkt rtn %d [%d]\n",
1938                                 krb5rc, kssl_err.reason);
1939                         if (kssl_err.text)
1940                                 printf("kssl_err text= %s\n", kssl_err.text);
1941 #endif  /* KSSL_DEBUG */
1942                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1943                                 kssl_err.reason);
1944                         goto err;
1945                         }
1946
1947                 /*  Note: no authenticator is not considered an error,
1948                 **  but will return authtime == 0.
1949                 */
1950                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
1951                                         &authtime, &kssl_err)) != 0)
1952                         {
1953 #ifdef KSSL_DEBUG
1954                         printf("kssl_check_authent rtn %d [%d]\n",
1955                                 krb5rc, kssl_err.reason);
1956                         if (kssl_err.text)
1957                                 printf("kssl_err text= %s\n", kssl_err.text);
1958 #endif  /* KSSL_DEBUG */
1959                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1960                                 kssl_err.reason);
1961                         goto err;
1962                         }
1963
1964                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
1965                         {
1966                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
1967                         goto err;
1968                         }
1969
1970 #ifdef KSSL_DEBUG
1971                 kssl_ctx_show(kssl_ctx);
1972 #endif  /* KSSL_DEBUG */
1973
1974                 enc = kssl_map_enc(kssl_ctx->enctype);
1975                 if (enc == NULL)
1976                     goto err;
1977
1978                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
1979
1980                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
1981                         {
1982                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1983                                 SSL_R_DECRYPTION_FAILED);
1984                         goto err;
1985                         }
1986                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
1987                                         (unsigned char *)enc_pms.data, enc_pms.length))
1988                         {
1989                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1990                                 SSL_R_DECRYPTION_FAILED);
1991                         goto err;
1992                         }
1993                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1994                         {
1995                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1996                                 SSL_R_DATA_LENGTH_TOO_LONG);
1997                         goto err;
1998                         }
1999                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2000                         {
2001                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2002                                 SSL_R_DECRYPTION_FAILED);
2003                         goto err;
2004                         }
2005                 outl += padl;
2006                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2007                         {
2008                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2009                                 SSL_R_DATA_LENGTH_TOO_LONG);
2010                         goto err;
2011                         }
2012                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2013
2014                 s->session->master_key_length=
2015                         s->method->ssl3_enc->generate_master_secret(s,
2016                                 s->session->master_key, pms, outl);
2017
2018                 if (kssl_ctx->client_princ)
2019                         {
2020                         int len = strlen(kssl_ctx->client_princ);
2021                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2022                                 {
2023                                 s->session->krb5_client_princ_len = len;
2024                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2025                                 }
2026                         }
2027
2028
2029                 /*  Was doing kssl_ctx_free() here,
2030                 **  but it caused problems for apache.
2031                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2032                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2033                 */
2034                 }
2035         else
2036 #endif  /* OPENSSL_NO_KRB5 */
2037
2038 #ifndef OPENSSL_NO_ECDH
2039                 if ((l & SSL_kECDH) || (l & SSL_kECDHE))
2040                 {
2041                 int ret = 1;
2042                 int field_size = 0;
2043                 const EC_KEY   *tkey;
2044                 const EC_GROUP *group;
2045                 const BIGNUM *priv_key;
2046
2047                 /* initialize structures for server's ECDH key pair */
2048                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2049                         {
2050                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2051                             ERR_R_MALLOC_FAILURE);
2052                         goto err;
2053                         }
2054
2055                 /* Let's get server private key and group information */
2056                 if (l & SSL_kECDH)
2057                         {
2058                         /* use the certificate */
2059                         tkey = s->cert->key->privatekey->pkey.ec;
2060                         }
2061                 else
2062                         {
2063                         /* use the ephermeral values we saved when
2064                          * generating the ServerKeyExchange msg.
2065                          */
2066                         tkey = s->s3->tmp.ecdh;
2067                         }
2068
2069                 group    = EC_KEY_get0_group(tkey);
2070                 priv_key = EC_KEY_get0_private_key(tkey);
2071
2072                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2073                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2074                         {
2075                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2076                                ERR_R_EC_LIB);
2077                         goto err;
2078                         }
2079
2080                 /* Let's get client's public key */
2081                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2082                         {
2083                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2084                             ERR_R_MALLOC_FAILURE);
2085                         goto err;
2086                         }
2087
2088                 if (n == 0L)
2089                         {
2090                         /* Client Publickey was in Client Certificate */
2091
2092                          if (l & SSL_kECDHE)
2093                                  {
2094                                  al=SSL_AD_HANDSHAKE_FAILURE;
2095                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2096                                  goto f_err;
2097                                  }
2098                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2099                             == NULL) ||
2100                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2101                                 {
2102                                 /* XXX: For now, we do not support client
2103                                  * authentication using ECDH certificates
2104                                  * so this branch (n == 0L) of the code is
2105                                  * never executed. When that support is
2106                                  * added, we ought to ensure the key
2107                                  * received in the certificate is
2108                                  * authorized for key agreement.
2109                                  * ECDH_compute_key implicitly checks that
2110                                  * the two ECDH shares are for the same
2111                                  * group.
2112                                  */
2113                                 al=SSL_AD_HANDSHAKE_FAILURE;
2114                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2115                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2116                                 goto f_err;
2117                                 }
2118
2119                         EC_POINT_copy(clnt_ecpoint,
2120                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec));
2121                         ret = 2; /* Skip certificate verify processing */
2122                         }
2123                 else
2124                         {
2125                         /* Get client's public key from encoded point
2126                          * in the ClientKeyExchange message.
2127                          */
2128                         if ((bn_ctx = BN_CTX_new()) == NULL)
2129                                 {
2130                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2131                                     ERR_R_MALLOC_FAILURE);
2132                                 goto err;
2133                                 }
2134
2135                         /* Get encoded point length */
2136                         i = *p;
2137                         p += 1;
2138                         if (EC_POINT_oct2point(group,
2139                             clnt_ecpoint, p, i, bn_ctx) == 0)
2140                                 {
2141                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2142                                     ERR_R_EC_LIB);
2143                                 goto err;
2144                                 }
2145                         /* p is pointing to somewhere in the buffer
2146                          * currently, so set it to the start
2147                          */
2148                         p=(unsigned char *)s->init_buf->data;
2149                         }
2150
2151                 /* Compute the shared pre-master secret */
2152                 field_size = EC_GROUP_get_degree(group);
2153                 if (field_size <= 0)
2154                         {
2155                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2156                                ERR_R_ECDH_LIB);
2157                         goto err;
2158                         }
2159                 /* If field size is not more than 24 octets, then use SHA-1 hash of result;
2160                  * otherwise, use result (see section 4.8 of draft-ietf-tls-ecc-03.txt;
2161                  * this is new with this version of the Internet Draft).
2162                  */
2163                 if (field_size <= 24 * 8)
2164                     i = ECDH_compute_key(p, KDF1_SHA1_len, clnt_ecpoint, srvr_ecdh, KDF1_SHA1);
2165                 else
2166                     i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2167                 if (i <= 0)
2168                         {
2169                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2170                             ERR_R_ECDH_LIB);
2171                         goto err;
2172                         }
2173
2174                 EVP_PKEY_free(clnt_pub_pkey);
2175                 EC_POINT_free(clnt_ecpoint);
2176                 if (srvr_ecdh != NULL)
2177                         EC_KEY_free(srvr_ecdh);
2178                 BN_CTX_free(bn_ctx);
2179
2180                 /* Compute the master secret */
2181                 s->session->master_key_length = s->method->ssl3_enc-> \
2182                     generate_master_secret(s, s->session->master_key, p, i);
2183
2184                 OPENSSL_cleanse(p, i);
2185                 return (ret);
2186                 }
2187         else
2188 #endif
2189                 {
2190                 al=SSL_AD_HANDSHAKE_FAILURE;
2191                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2192                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2193                 goto f_err;
2194                 }
2195
2196         return(1);
2197 f_err:
2198         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2199 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2200 err:
2201 #endif
2202 #ifndef OPENSSL_NO_ECDH
2203         EVP_PKEY_free(clnt_pub_pkey);
2204         EC_POINT_free(clnt_ecpoint);
2205         if (srvr_ecdh != NULL)
2206                 EC_KEY_free(srvr_ecdh);
2207         BN_CTX_free(bn_ctx);
2208 #endif
2209         return(-1);
2210         }
2211
2212 int ssl3_get_cert_verify(SSL *s)
2213         {
2214         EVP_PKEY *pkey=NULL;
2215         unsigned char *p;
2216         int al,ok,ret=0;
2217         long n;
2218         int type=0,i,j;
2219         X509 *peer;
2220
2221         n=s->method->ssl_get_message(s,
2222                 SSL3_ST_SR_CERT_VRFY_A,
2223                 SSL3_ST_SR_CERT_VRFY_B,
2224                 -1,
2225                 514, /* 514? */
2226                 &ok);
2227
2228         if (!ok) return((int)n);
2229
2230         if (s->session->peer != NULL)
2231                 {
2232                 peer=s->session->peer;
2233                 pkey=X509_get_pubkey(peer);
2234                 type=X509_certificate_type(peer,pkey);
2235                 }
2236         else
2237                 {
2238                 peer=NULL;
2239                 pkey=NULL;
2240                 }
2241
2242         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2243                 {
2244                 s->s3->tmp.reuse_message=1;
2245                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2246                         {
2247                         al=SSL_AD_UNEXPECTED_MESSAGE;
2248                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2249                         goto f_err;
2250                         }
2251                 ret=1;
2252                 goto end;
2253                 }
2254
2255         if (peer == NULL)
2256                 {
2257                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2258                 al=SSL_AD_UNEXPECTED_MESSAGE;
2259                 goto f_err;
2260                 }
2261
2262         if (!(type & EVP_PKT_SIGN))
2263                 {
2264                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2265                 al=SSL_AD_ILLEGAL_PARAMETER;
2266                 goto f_err;
2267                 }
2268
2269         if (s->s3->change_cipher_spec)
2270                 {
2271                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2272                 al=SSL_AD_UNEXPECTED_MESSAGE;
2273                 goto f_err;
2274                 }
2275
2276         /* we now have a signature that we need to verify */
2277         p=(unsigned char *)s->init_msg;
2278         n2s(p,i);
2279         n-=2;
2280         if (i > n)
2281                 {
2282                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2283                 al=SSL_AD_DECODE_ERROR;
2284                 goto f_err;
2285                 }
2286
2287         j=EVP_PKEY_size(pkey);
2288         if ((i > j) || (n > j) || (n <= 0))
2289                 {
2290                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2291                 al=SSL_AD_DECODE_ERROR;
2292                 goto f_err;
2293                 }
2294
2295 #ifndef OPENSSL_NO_RSA
2296         if (pkey->type == EVP_PKEY_RSA)
2297                 {
2298                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2299                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
2300                                                         pkey->pkey.rsa);
2301                 if (i < 0)
2302                         {
2303                         al=SSL_AD_DECRYPT_ERROR;
2304                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2305                         goto f_err;
2306                         }
2307                 if (i == 0)
2308                         {
2309                         al=SSL_AD_DECRYPT_ERROR;
2310                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2311                         goto f_err;
2312                         }
2313                 }
2314         else
2315 #endif
2316 #ifndef OPENSSL_NO_DSA
2317                 if (pkey->type == EVP_PKEY_DSA)
2318                 {
2319                 j=DSA_verify(pkey->save_type,
2320                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2321                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2322                 if (j <= 0)
2323                         {
2324                         /* bad signature */
2325                         al=SSL_AD_DECRYPT_ERROR;
2326                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2327                         goto f_err;
2328                         }
2329                 }
2330         else
2331 #endif
2332 #ifndef OPENSSL_NO_ECDSA
2333                 if (pkey->type == EVP_PKEY_EC)
2334                 {
2335                 j=ECDSA_verify(pkey->save_type,
2336                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2337                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2338                 if (j <= 0)
2339                         {
2340                         /* bad signature */
2341                         al=SSL_AD_DECRYPT_ERROR;
2342                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2343                             SSL_R_BAD_ECDSA_SIGNATURE);
2344                         goto f_err;
2345                         }
2346                 }
2347         else
2348 #endif
2349                 {
2350                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2351                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2352                 goto f_err;
2353                 }
2354
2355
2356         ret=1;
2357         if (0)
2358                 {
2359 f_err:
2360                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2361                 }
2362 end:
2363         EVP_PKEY_free(pkey);
2364         return(ret);
2365         }
2366
2367 int ssl3_get_client_certificate(SSL *s)
2368         {
2369         int i,ok,al,ret= -1;
2370         X509 *x=NULL;
2371         unsigned long l,nc,llen,n;
2372         const unsigned char *p,*q;
2373         unsigned char *d;
2374         STACK_OF(X509) *sk=NULL;
2375
2376         n=s->method->ssl_get_message(s,
2377                 SSL3_ST_SR_CERT_A,
2378                 SSL3_ST_SR_CERT_B,
2379                 -1,
2380                 s->max_cert_list,
2381                 &ok);
2382
2383         if (!ok) return((int)n);
2384
2385         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2386                 {
2387                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2388                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2389                         {
2390                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2391                         al=SSL_AD_HANDSHAKE_FAILURE;
2392                         goto f_err;
2393                         }
2394                 /* If tls asked for a client cert, the client must return a 0 list */
2395                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2396                         {
2397                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2398                         al=SSL_AD_UNEXPECTED_MESSAGE;
2399                         goto f_err;
2400                         }
2401                 s->s3->tmp.reuse_message=1;
2402                 return(1);
2403                 }
2404
2405         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2406                 {
2407                 al=SSL_AD_UNEXPECTED_MESSAGE;
2408                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2409                 goto f_err;
2410                 }
2411         p=d=(unsigned char *)s->init_msg;
2412
2413         if ((sk=sk_X509_new_null()) == NULL)
2414                 {
2415                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2416                 goto err;
2417                 }
2418
2419         n2l3(p,llen);
2420         if (llen+3 != n)
2421                 {
2422                 al=SSL_AD_DECODE_ERROR;
2423                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2424                 goto f_err;
2425                 }
2426         for (nc=0; nc<llen; )
2427                 {
2428                 n2l3(p,l);
2429                 if ((l+nc+3) > llen)
2430                         {
2431                         al=SSL_AD_DECODE_ERROR;
2432                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2433                         goto f_err;
2434                         }
2435
2436                 q=p;
2437                 x=d2i_X509(NULL,&p,l);
2438                 if (x == NULL)
2439                         {
2440                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2441                         goto err;
2442                         }
2443                 if (p != (q+l))
2444                         {
2445                         al=SSL_AD_DECODE_ERROR;
2446                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2447                         goto f_err;
2448                         }
2449                 if (!sk_X509_push(sk,x))
2450                         {
2451                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2452                         goto err;
2453                         }
2454                 x=NULL;
2455                 nc+=l+3;
2456                 }
2457
2458         if (sk_X509_num(sk) <= 0)
2459                 {
2460                 /* TLS does not mind 0 certs returned */
2461                 if (s->version == SSL3_VERSION)
2462                         {
2463                         al=SSL_AD_HANDSHAKE_FAILURE;
2464                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2465                         goto f_err;
2466                         }
2467                 /* Fail for TLS only if we required a certificate */
2468                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2469                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2470                         {
2471                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2472                         al=SSL_AD_HANDSHAKE_FAILURE;
2473                         goto f_err;
2474                         }
2475                 }
2476         else
2477                 {
2478                 i=ssl_verify_cert_chain(s,sk);
2479                 if (!i)
2480                         {
2481                         al=ssl_verify_alarm_type(s->verify_result);
2482                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2483                         goto f_err;
2484                         }
2485                 }
2486
2487         if (s->session->peer != NULL) /* This should not be needed */
2488                 X509_free(s->session->peer);
2489         s->session->peer=sk_X509_shift(sk);
2490         s->session->verify_result = s->verify_result;
2491
2492         /* With the current implementation, sess_cert will always be NULL
2493          * when we arrive here. */
2494         if (s->session->sess_cert == NULL)
2495                 {
2496                 s->session->sess_cert = ssl_sess_cert_new();
2497                 if (s->session->sess_cert == NULL)
2498                         {
2499                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2500                         goto err;
2501                         }
2502                 }
2503         if (s->session->sess_cert->cert_chain != NULL)
2504                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2505         s->session->sess_cert->cert_chain=sk;
2506         /* Inconsistency alert: cert_chain does *not* include the
2507          * peer's own certificate, while we do include it in s3_clnt.c */
2508
2509         sk=NULL;
2510
2511         ret=1;
2512         if (0)
2513                 {
2514 f_err:
2515                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2516                 }
2517 err:
2518         if (x != NULL) X509_free(x);
2519         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2520         return(ret);
2521         }
2522
2523 int ssl3_send_server_certificate(SSL *s)
2524         {
2525         unsigned long l;
2526         X509 *x;
2527
2528         if (s->state == SSL3_ST_SW_CERT_A)
2529                 {
2530                 x=ssl_get_server_send_cert(s);
2531                 if (x == NULL &&
2532                         /* VRS: allow null cert if auth == KRB5 */
2533                         (s->s3->tmp.new_cipher->algorithms
2534                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
2535                         != (SSL_aKRB5|SSL_kKRB5))
2536                         {
2537                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2538                         return(0);
2539                         }
2540
2541                 l=ssl3_output_cert_chain(s,x);
2542                 s->state=SSL3_ST_SW_CERT_B;
2543                 s->init_num=(int)l;
2544                 s->init_off=0;
2545                 }
2546
2547         /* SSL3_ST_SW_CERT_B */
2548         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2549         }
2550
2551
2552 #ifndef OPENSSL_NO_ECDH
2553 /* This is the complement of curve_id2nid in s3_clnt.c. */
2554 static int nid2curve_id(int nid)
2555 {
2556         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2557          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2558         switch (nid) {
2559         case NID_sect163k1: /* sect163k1 (1) */
2560                 return 1;
2561         case NID_sect163r1: /* sect163r1 (2) */
2562                 return 2;
2563         case NID_sect163r2: /* sect163r2 (3) */
2564                 return 3;
2565         case NID_sect193r1: /* sect193r1 (4) */
2566                 return 4;
2567         case NID_sect193r2: /* sect193r2 (5) */
2568                 return 5;
2569         case NID_sect233k1: /* sect233k1 (6) */
2570                 return 6;
2571         case NID_sect233r1: /* sect233r1 (7) */
2572                 return 7;
2573         case NID_sect239k1: /* sect239k1 (8) */
2574                 return 8;
2575         case NID_sect283k1: /* sect283k1 (9) */
2576                 return 9;
2577         case NID_sect283r1: /* sect283r1 (10) */
2578                 return 10;
2579         case NID_sect409k1: /* sect409k1 (11) */
2580                 return 11;
2581         case NID_sect409r1: /* sect409r1 (12) */
2582                 return 12;
2583         case NID_sect571k1: /* sect571k1 (13) */
2584                 return 13;
2585         case NID_sect571r1: /* sect571r1 (14) */
2586                 return 14;
2587         case NID_secp160k1: /* secp160k1 (15) */
2588                 return 15;
2589         case NID_secp160r1: /* secp160r1 (16) */
2590                 return 16;
2591         case NID_secp160r2: /* secp160r2 (17) */
2592                 return 17;
2593         case NID_secp192k1: /* secp192k1 (18) */
2594                 return 18;
2595         case NID_X9_62_prime192v1: /* secp192r1 (19) */
2596                 return 19;
2597         case NID_secp224k1: /* secp224k1 (20) */
2598                 return 20;
2599         case NID_secp224r1: /* secp224r1 (21) */
2600                 return 21;
2601         case NID_secp256k1: /* secp256k1 (22) */
2602                 return 22;
2603         case NID_X9_62_prime256v1: /* secp256r1 (23) */
2604                 return 23;
2605         case NID_secp384r1: /* secp384r1 (24) */
2606                 return 24;
2607         case NID_secp521r1:  /* secp521r1 (25) */
2608                 return 25;
2609         default:
2610                 return 0;
2611         }
2612 }
2613 #endif