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