ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2005 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124
 125 #define REUSE_CIPHER_BUG
 126 #define NETSCAPE_HANG_BUG
 127
 128 #include <stdio.h>
 129 #include "ssl_locl.h"
 130 #include "kssl_lcl.h"
 131 #include <openssl/buffer.h>
 132 #include <openssl/rand.h>
 133 #include <openssl/objects.h>
 134 #include <openssl/evp.h>
 135 #include <openssl/x509.h>
 136 #ifndef OPENSSL_NO_DH
 137 #include <openssl/dh.h>
 138 #endif
 139 #include <openssl/bn.h>
 140 #ifndef OPENSSL_NO_KRB5
 141 #include <openssl/krb5_asn.h>
 142 #endif
 143 #include <openssl/md5.h>
 144
 145 static const SSL_METHOD *ssl3_get_server_method(int ver);
 146
 147 #ifndef OPENSSL_NO_ECDH
 148 static int nid2curve_id(int nid);
 149 #endif
 150
 151 static const SSL_METHOD *ssl3_get_server_method(int ver)
 152         {
 153         if (ver == SSL3_VERSION)
 154                 return(SSLv3_server_method());
 155         else
 156                 return(NULL);
 157         }
 158
 159 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
 160                         ssl3_accept,
 161                         ssl_undefined_function,
 162                         ssl3_get_server_method)
 163
 164 int ssl3_accept(SSL *s)
 165         {
 166         BUF_MEM *buf;
 167         unsigned long l,Time=(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 #ifndef OPENSSL_NO_TLSEXT
 285                         {
 286                                 int extension_error = 0,al;
 287                                 if ((al = ssl_check_Hello_TLS_extensions(s,&extension_error)) != SSL_ERROR_NONE){
 288                                         ret = -1;
 289                                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_CLIENTHELLO_TLS_EXT);
 290                                         ssl3_send_alert(s,al,extension_error);
 291                                         goto end;
 292                                 }
 293                         }
 294 #endif
 295                         s->new_session = 2;
 296                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 297                         s->init_num=0;
 298                         break;
 299
 300                 case SSL3_ST_SW_SRVR_HELLO_A:
 301                 case SSL3_ST_SW_SRVR_HELLO_B:
 302                         ret=ssl3_send_server_hello(s);
 303                         if (ret <= 0) goto end;
 304
 305                         if (s->hit)
 306                                 s->state=SSL3_ST_SW_CHANGE_A;
 307                         else
 308                                 s->state=SSL3_ST_SW_CERT_A;
 309                         s->init_num=0;
 310                         break;
 311
 312                 case SSL3_ST_SW_CERT_A:
 313                 case SSL3_ST_SW_CERT_B:
 314                         /* Check if it is anon DH or anon ECDH */
 315                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 316                                 {
 317                                 ret=ssl3_send_server_certificate(s);
 318                                 if (ret <= 0) goto end;
 319                                 }
 320                         else
 321                                 skip=1;
 322                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 323                         s->init_num=0;
 324                         break;
 325
 326                 case SSL3_ST_SW_KEY_EXCH_A:
 327                 case SSL3_ST_SW_KEY_EXCH_B:
 328                         l=s->s3->tmp.new_cipher->algorithms;
 329
 330                         /* clear this, it may get reset by
 331                          * send_server_key_exchange */
 332                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 333 #ifndef OPENSSL_NO_KRB5
 334                                 && !(l & SSL_KRB5)
 335 #endif /* OPENSSL_NO_KRB5 */
 336                                 )
 337                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 338                                  * even when forbidden by protocol specs
 339                                  * (handshake may fail as clients are not required to
 340                                  * be able to handle this) */
 341                                 s->s3->tmp.use_rsa_tmp=1;
 342                         else
 343                                 s->s3->tmp.use_rsa_tmp=0;
 344
 345
 346                         /* only send if a DH key exchange, fortezza or
 347                          * RSA but we have a sign only certificate
 348                          *
 349                          * For ECC ciphersuites, we send a serverKeyExchange
 350                          * message only if the cipher suite is either
 351                          * ECDH-anon or ECDHE. In other cases, the
 352                          * server certificate contains the server's
 353                          * public key for key exchange.
 354                          */
 355                         if (s->s3->tmp.use_rsa_tmp
 356                             || (l & SSL_kECDHE)
 357                             || (l & (SSL_DH|SSL_kFZA))
 358                             || ((l & SSL_kRSA)
 359                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 360                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 361                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 362                                         )
 363                                     )
 364                                 )
 365                             )
 366                                 {
 367                                 ret=ssl3_send_server_key_exchange(s);
 368                                 if (ret <= 0) goto end;
 369                                 }
 370                         else
 371                                 skip=1;
 372
 373                         s->state=SSL3_ST_SW_CERT_REQ_A;
 374                         s->init_num=0;
 375                         break;
 376
 377                 case SSL3_ST_SW_CERT_REQ_A:
 378                 case SSL3_ST_SW_CERT_REQ_B:
 379                         if (/* don't request cert unless asked for it: */
 380                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 381                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 382                                  * don't request cert during re-negotiation: */
 383                                 ((s->session->peer != NULL) &&
 384                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 385                                 /* never request cert in anonymous ciphersuites
 386                                  * (see section "Certificate request" in SSL 3 drafts
 387                                  * and in RFC 2246): */
 388                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 389                                  /* ... except when the application insists on verification
 390                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 391                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 392                                  /* never request cert in Kerberos ciphersuites */
 393                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 394                                 {
 395                                 /* no cert request */
 396                                 skip=1;
 397                                 s->s3->tmp.cert_request=0;
 398                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 399                                 }
 400                         else
 401                                 {
 402                                 s->s3->tmp.cert_request=1;
 403                                 ret=ssl3_send_certificate_request(s);
 404                                 if (ret <= 0) goto end;
 405 #ifndef NETSCAPE_HANG_BUG
 406                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 407 #else
 408                                 s->state=SSL3_ST_SW_FLUSH;
 409                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 410 #endif
 411                                 s->init_num=0;
 412                                 }
 413                         break;
 414
 415                 case SSL3_ST_SW_SRVR_DONE_A:
 416                 case SSL3_ST_SW_SRVR_DONE_B:
 417                         ret=ssl3_send_server_done(s);
 418                         if (ret <= 0) goto end;
 419                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 420                         s->state=SSL3_ST_SW_FLUSH;
 421                         s->init_num=0;
 422                         break;
 423
 424                 case SSL3_ST_SW_FLUSH:
 425                         /* number of bytes to be flushed */
 426                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 427                         if (num1 > 0)
 428                                 {
 429                                 s->rwstate=SSL_WRITING;
 430                                 num1=BIO_flush(s->wbio);
 431                                 if (num1 <= 0) { ret= -1; goto end; }
 432                                 s->rwstate=SSL_NOTHING;
 433                                 }
 434
 435                         s->state=s->s3->tmp.next_state;
 436                         break;
 437
 438                 case SSL3_ST_SR_CERT_A:
 439                 case SSL3_ST_SR_CERT_B:
 440                         /* Check for second client hello (MS SGC) */
 441                         ret = ssl3_check_client_hello(s);
 442                         if (ret <= 0)
 443                                 goto end;
 444                         if (ret == 2)
 445                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 446                         else {
 447                                 if (s->s3->tmp.cert_request)
 448                                         {
 449                                         ret=ssl3_get_client_certificate(s);
 450                                         if (ret <= 0) goto end;
 451                                         }
 452                                 s->init_num=0;
 453                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 454                         }
 455                         break;
 456
 457                 case SSL3_ST_SR_KEY_EXCH_A:
 458                 case SSL3_ST_SR_KEY_EXCH_B:
 459                         ret=ssl3_get_client_key_exchange(s);
 460                         if (ret <= 0)
 461                                 goto end;
 462                         if (ret == 2)
 463                                 {
 464                                 /* For the ECDH ciphersuites when
 465                                  * the client sends its ECDH pub key in
 466                                  * a certificate, the CertificateVerify
 467                                  * message is not sent.
 468                                  */
 469                                 s->state=SSL3_ST_SR_FINISHED_A;
 470                                 s->init_num = 0;
 471                                 }
 472                         else
 473                                 {
 474                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 475                                 s->init_num=0;
 476
 477                                 /* We need to get hashes here so if there is
 478                                  * a client cert, it can be verified
 479                                  */
 480                                 s->method->ssl3_enc->cert_verify_mac(s,
 481                                     &(s->s3->finish_dgst1),
 482                                     &(s->s3->tmp.cert_verify_md[0]));
 483                                 s->method->ssl3_enc->cert_verify_mac(s,
 484                                     &(s->s3->finish_dgst2),
 485                                     &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 486                                 }
 487                         break;
 488
 489                 case SSL3_ST_SR_CERT_VRFY_A:
 490                 case SSL3_ST_SR_CERT_VRFY_B:
 491
 492                         /* we should decide if we expected this one */
 493                         ret=ssl3_get_cert_verify(s);
 494                         if (ret <= 0) goto end;
 495
 496                         s->state=SSL3_ST_SR_FINISHED_A;
 497                         s->init_num=0;
 498                         break;
 499
 500                 case SSL3_ST_SR_FINISHED_A:
 501                 case SSL3_ST_SR_FINISHED_B:
 502                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 503                                 SSL3_ST_SR_FINISHED_B);
 504                         if (ret <= 0) goto end;
 505                         if (s->hit)
 506                                 s->state=SSL_ST_OK;
 507                         else
 508                                 s->state=SSL3_ST_SW_CHANGE_A;
 509                         s->init_num=0;
 510                         break;
 511
 512                 case SSL3_ST_SW_CHANGE_A:
 513                 case SSL3_ST_SW_CHANGE_B:
 514
 515                         s->session->cipher=s->s3->tmp.new_cipher;
 516                         if (!s->method->ssl3_enc->setup_key_block(s))
 517                                 { ret= -1; goto end; }
 518
 519                         ret=ssl3_send_change_cipher_spec(s,
 520                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 521
 522                         if (ret <= 0) goto end;
 523                         s->state=SSL3_ST_SW_FINISHED_A;
 524                         s->init_num=0;
 525
 526                         if (!s->method->ssl3_enc->change_cipher_state(s,
 527                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 528                                 {
 529                                 ret= -1;
 530                                 goto end;
 531                                 }
 532
 533                         break;
 534
 535                 case SSL3_ST_SW_FINISHED_A:
 536                 case SSL3_ST_SW_FINISHED_B:
 537                         ret=ssl3_send_finished(s,
 538                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 539                                 s->method->ssl3_enc->server_finished_label,
 540                                 s->method->ssl3_enc->server_finished_label_len);
 541                         if (ret <= 0) goto end;
 542                         s->state=SSL3_ST_SW_FLUSH;
 543                         if (s->hit)
 544                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 545                         else
 546                                 s->s3->tmp.next_state=SSL_ST_OK;
 547                         s->init_num=0;
 548                         break;
 549
 550                 case SSL_ST_OK:
 551                         /* clean a few things up */
 552                         ssl3_cleanup_key_block(s);
 553
 554                         BUF_MEM_free(s->init_buf);
 555                         s->init_buf=NULL;
 556
 557                         /* remove buffering on output */
 558                         ssl_free_wbio_buffer(s);
 559
 560                         s->init_num=0;
 561
 562                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 563                                 {
 564                                 /* actually not necessarily a 'new' session unless
 565                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 566
 567                                 s->new_session=0;
 568
 569                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 570
 571                                 s->ctx->stats.sess_accept_good++;
 572                                 /* s->server=1; */
 573                                 s->handshake_func=ssl3_accept;
 574
 575                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 576                                 }
 577
 578                         ret = 1;
 579                         goto end;
 580                         /* break; */
 581
 582                 default:
 583                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 584                         ret= -1;
 585                         goto end;
 586                         /* break; */
 587                         }
 588
 589                 if (!s->s3->tmp.reuse_message && !skip)
 590                         {
 591                         if (s->debug)
 592                                 {
 593                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 594                                         goto end;
 595                                 }
 596
 597
 598                         if ((cb != NULL) && (s->state != state))
 599                                 {
 600                                 new_state=s->state;
 601                                 s->state=state;
 602                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 603                                 s->state=new_state;
 604                                 }
 605                         }
 606                 skip=0;
 607                 }
 608 end:
 609         /* BIO_flush(s->wbio); */
 610
 611         s->in_handshake--;
 612         if (cb != NULL)
 613                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 614         return(ret);
 615         }
 616
 617 int ssl3_send_hello_request(SSL *s)
 618         {
 619         unsigned char *p;
 620
 621         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 622                 {
 623                 p=(unsigned char *)s->init_buf->data;
 624                 *(p++)=SSL3_MT_HELLO_REQUEST;
 625                 *(p++)=0;
 626                 *(p++)=0;
 627                 *(p++)=0;
 628
 629                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 630                 /* number of bytes to write */
 631                 s->init_num=4;
 632                 s->init_off=0;
 633                 }
 634
 635         /* SSL3_ST_SW_HELLO_REQ_B */
 636         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 637         }
 638
 639 int ssl3_check_client_hello(SSL *s)
 640         {
 641         int ok;
 642         long n;
 643
 644         /* this function is called when we really expect a Certificate message,
 645          * so permit appropriate message length */
 646         n=s->method->ssl_get_message(s,
 647                 SSL3_ST_SR_CERT_A,
 648                 SSL3_ST_SR_CERT_B,
 649                 -1,
 650                 s->max_cert_list,
 651                 &ok);
 652         if (!ok) return((int)n);
 653         s->s3->tmp.reuse_message = 1;
 654         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 655                 {
 656                 /* Throw away what we have done so far in the current handshake,
 657                  * which will now be aborted. (A full SSL_clear would be too much.)
 658                  * I hope that tmp.dh is the only thing that may need to be cleared
 659                  * when a handshake is not completed ... */
 660 #ifndef OPENSSL_NO_DH
 661                 if (s->s3->tmp.dh != NULL)
 662                         {
 663                         DH_free(s->s3->tmp.dh);
 664                         s->s3->tmp.dh = NULL;
 665                         }
 666 #endif
 667                 return 2;
 668                 }
 669         return 1;
 670 }
 671
 672 int ssl3_get_client_hello(SSL *s)
 673         {
 674         int i,j,ok,al,ret= -1;
 675         unsigned int cookie_len;
 676         long n;
 677         unsigned long id;
 678         unsigned char *p,*d,*q;
 679         SSL_CIPHER *c;
 680 #ifndef OPENSSL_NO_COMP
 681         SSL_COMP *comp=NULL;
 682 #endif
 683         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 684
 685         /* We do this so that we will respond with our native type.
 686          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 687          * This down switching should be handled by a different method.
 688          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 689          * TLSv1.
 690          */
 691         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 692                 {
 693                 s->first_packet=1;
 694                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 695                 }
 696         n=s->method->ssl_get_message(s,
 697                 SSL3_ST_SR_CLNT_HELLO_B,
 698                 SSL3_ST_SR_CLNT_HELLO_C,
 699                 SSL3_MT_CLIENT_HELLO,
 700                 SSL3_RT_MAX_PLAIN_LENGTH,
 701                 &ok);
 702
 703         if (!ok) return((int)n);
 704         d=p=(unsigned char *)s->init_msg;
 705
 706         /* use version from inside client hello, not from record header
 707          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 708         s->client_version=(((int)p[0])<<8)|(int)p[1];
 709         p+=2;
 710
 711         if (s->client_version < s->version)
 712                 {
 713                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 714                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 715                         {
 716                         /* similar to ssl3_get_record, send alert using remote version number */
 717                         s->version = s->client_version;
 718                         }
 719                 al = SSL_AD_PROTOCOL_VERSION;
 720                 goto f_err;
 721                 }
 722
 723         /* load the client random */
 724         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 725         p+=SSL3_RANDOM_SIZE;
 726
 727         /* get the session-id */
 728         j= *(p++);
 729
 730         s->hit=0;
 731         /* Versions before 0.9.7 always allow session reuse during renegotiation
 732          * (i.e. when s->new_session is true), option
 733          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
 734          * Maybe this optional behaviour should always have been the default,
 735          * but we cannot safely change the default behaviour (or new applications
 736          * might be written that become totally unsecure when compiled with
 737          * an earlier library version)
 738          */
 739         if (j == 0 || (s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 740                 {
 741                 if (!ssl_get_new_session(s,1))
 742                         goto err;
 743                 }
 744         else
 745                 {
 746                 i=ssl_get_prev_session(s,p,j);
 747                 if (i == 1)
 748                         { /* previous session */
 749                         s->hit=1;
 750                         }
 751                 else if (i == -1)
 752                         goto err;
 753                 else /* i == 0 */
 754                         {
 755                         if (!ssl_get_new_session(s,1))
 756                                 goto err;
 757                         }
 758                 }
 759
 760         p+=j;
 761
 762         if (SSL_version(s) == DTLS1_VERSION)
 763                 {
 764                 /* cookie stuff */
 765                 cookie_len = *(p++);
 766
 767                 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 768                         s->d1->send_cookie == 0)
 769                         {
 770                         /* HelloVerifyMessage has already been sent */
 771                         if ( cookie_len != s->d1->cookie_len)
 772                                 {
 773                                 al = SSL_AD_HANDSHAKE_FAILURE;
 774                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 775                                 goto f_err;
 776                                 }
 777                         }
 778
 779                 /*
 780                  * The ClientHello may contain a cookie even if the
 781                  * HelloVerify message has not been sent--make sure that it
 782                  * does not cause an overflow.
 783                  */
 784                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
 785                         {
 786                         /* too much data */
 787                         al = SSL_AD_DECODE_ERROR;
 788                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 789                         goto f_err;
 790                         }
 791
 792                 /* verify the cookie if appropriate option is set. */
 793                 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 794                         cookie_len > 0)
 795                         {
 796                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
 797
 798                         if ( s->ctx->app_verify_cookie_cb != NULL)
 799                                 {
 800                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
 801                                         cookie_len) == 0)
 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                                 /* else cookie verification succeeded */
 809                                 }
 810                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
 811                                                   s->d1->cookie_len) != 0) /* default verification */
 812                                 {
 813                                         al=SSL_AD_HANDSHAKE_FAILURE;
 814                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 815                                                 SSL_R_COOKIE_MISMATCH);
 816                                         goto f_err;
 817                                 }
 818                         }
 819
 820                 p += cookie_len;
 821                 }
 822
 823         n2s(p,i);
 824         if ((i == 0) && (j != 0))
 825                 {
 826                 /* we need a cipher if we are not resuming a session */
 827                 al=SSL_AD_ILLEGAL_PARAMETER;
 828                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 829                 goto f_err;
 830                 }
 831         if ((p+i) >= (d+n))
 832                 {
 833                 /* not enough data */
 834                 al=SSL_AD_DECODE_ERROR;
 835                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 836                 goto f_err;
 837                 }
 838         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 839                 == NULL))
 840                 {
 841                 goto err;
 842                 }
 843         p+=i;
 844
 845         /* If it is a hit, check that the cipher is in the list */
 846         if ((s->hit) && (i > 0))
 847                 {
 848                 j=0;
 849                 id=s->session->cipher->id;
 850
 851 #ifdef CIPHER_DEBUG
 852                 printf("client sent %d ciphers\n",sk_num(ciphers));
 853 #endif
 854                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 855                         {
 856                         c=sk_SSL_CIPHER_value(ciphers,i);
 857 #ifdef CIPHER_DEBUG
 858                         printf("client [%2d of %2d]:%s\n",
 859                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 860 #endif
 861                         if (c->id == id)
 862                                 {
 863                                 j=1;
 864                                 break;
 865                                 }
 866                         }
 867                 if (j == 0)
 868                         {
 869                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 870                                 {
 871                                 /* Very bad for multi-threading.... */
 872                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers, 0);
 873                                 }
 874                         else
 875                                 {
 876                                 /* we need to have the cipher in the cipher
 877                                  * list if we are asked to reuse it */
 878                                 al=SSL_AD_ILLEGAL_PARAMETER;
 879                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 880                                 goto f_err;
 881                                 }
 882                         }
 883                 }
 884
 885         /* compression */
 886         i= *(p++);
 887         if ((p+i) > (d+n))
 888                 {
 889                 /* not enough data */
 890                 al=SSL_AD_DECODE_ERROR;
 891                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 892                 goto f_err;
 893                 }
 894         q=p;
 895         for (j=0; j<i; j++)
 896                 {
 897                 if (p[j] == 0) break;
 898                 }
 899
 900         p+=i;
 901         if (j >= i)
 902                 {
 903                 /* no compress */
 904                 al=SSL_AD_DECODE_ERROR;
 905                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 906                 goto f_err;
 907                 }
 908
 909         /* Worst case, we will use the NULL compression, but if we have other
 910          * options, we will now look for them.  We have i-1 compression
 911          * algorithms from the client, starting at q. */
 912         s->s3->tmp.new_compression=NULL;
 913 #ifndef OPENSSL_NO_COMP
 914         if (!(s->options & SSL_OP_NO_COMPRESSION) && s->ctx->comp_methods)
 915                 { /* See if we have a match */
 916                 int m,nn,o,v,done=0;
 917
 918                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
 919                 for (m=0; m<nn; m++)
 920                         {
 921                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
 922                         v=comp->id;
 923                         for (o=0; o<i; o++)
 924                                 {
 925                                 if (v == q[o])
 926                                         {
 927                                         done=1;
 928                                         break;
 929                                         }
 930                                 }
 931                         if (done) break;
 932                         }
 933                 if (done)
 934                         s->s3->tmp.new_compression=comp;
 935                 else
 936                         comp=NULL;
 937                 }
 938 #endif
 939
 940         /* TLS does not mind if there is extra stuff */
 941 #if 0   /* SSL 3.0 does not mind either, so we should disable this test
 942          * (was enabled in 0.9.6d through 0.9.6j and 0.9.7 through 0.9.7b,
 943          * in earlier SSLeay/OpenSSL releases this test existed but was buggy) */
 944         if (s->version == SSL3_VERSION)
 945                 {
 946                 if (p < (d+n))
 947                         {
 948                         /* wrong number of bytes,
 949                          * there could be more to follow */
 950                         al=SSL_AD_DECODE_ERROR;
 951                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 952                         goto f_err;
 953                         }
 954                 }
 955 #endif
 956 #ifndef OPENSSL_NO_TLSEXT
 957         /* TLS extensions*/
 958         if (s->version > SSL3_VERSION)
 959         {
 960                 if ((al = ssl_parse_ClientHello_TLS_extensions(s,&p,d,n)) != SSL_ERROR_NONE){
 961                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLS_EXT);
 962                         ssl3_send_alert(s,SSL3_AL_WARNING,al);
 963                         return (ret = al);
 964                 }
 965         }
 966 #endif
 967
 968         /* Given s->session->ciphers and SSL_get_ciphers, we must
 969          * pick a cipher */
 970
 971         if (!s->hit)
 972                 {
 973 #ifdef OPENSSL_NO_COMP
 974                 s->session->compress_meth=0;
 975 #else
 976                 s->session->compress_meth=(comp == NULL)?0:comp->id;
 977 #endif
 978                 if (s->session->ciphers != NULL)
 979                         sk_SSL_CIPHER_free(s->session->ciphers);
 980                 s->session->ciphers=ciphers;
 981                 if (ciphers == NULL)
 982                         {
 983                         al=SSL_AD_ILLEGAL_PARAMETER;
 984                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 985                         goto f_err;
 986                         }
 987                 ciphers=NULL;
 988                 c=ssl3_choose_cipher(s,s->session->ciphers,
 989                                      SSL_get_ciphers(s));
 990
 991                 if (c == NULL)
 992                         {
 993                         al=SSL_AD_HANDSHAKE_FAILURE;
 994                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 995                         goto f_err;
 996                         }
 997                 s->s3->tmp.new_cipher=c;
 998                 }
 999         else
1000                 {
1001                 /* Session-id reuse */
1002 #ifdef REUSE_CIPHER_BUG
1003                 STACK_OF(SSL_CIPHER) *sk;
1004                 SSL_CIPHER *nc=NULL;
1005                 SSL_CIPHER *ec=NULL;
1006
1007                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1008                         {
1009                         sk=s->session->ciphers;
1010                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1011                                 {
1012                                 c=sk_SSL_CIPHER_value(sk,i);
1013                                 if (c->algorithms & SSL_eNULL)
1014                                         nc=c;
1015                                 if (SSL_C_IS_EXPORT(c))
1016                                         ec=c;
1017                                 }
1018                         if (nc != NULL)
1019                                 s->s3->tmp.new_cipher=nc;
1020                         else if (ec != NULL)
1021                                 s->s3->tmp.new_cipher=ec;
1022                         else
1023                                 s->s3->tmp.new_cipher=s->session->cipher;
1024                         }
1025                 else
1026 #endif
1027                 s->s3->tmp.new_cipher=s->session->cipher;
1028                 }
1029
1030         /* we now have the following setup.
1031          * client_random
1032          * cipher_list          - our prefered list of ciphers
1033          * ciphers              - the clients prefered list of ciphers
1034          * compression          - basically ignored right now
1035          * ssl version is set   - sslv3
1036          * s->session           - The ssl session has been setup.
1037          * s->hit               - session reuse flag
1038          * s->tmp.new_cipher    - the new cipher to use.
1039          */
1040
1041         ret=1;
1042         if (0)
1043                 {
1044 f_err:
1045                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1046                 }
1047 err:
1048         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1049         return(ret);
1050         }
1051
1052 int ssl3_send_server_hello(SSL *s)
1053         {
1054         unsigned char *buf;
1055         unsigned char *p,*d;
1056         int i,sl;
1057         unsigned long l,Time;
1058
1059         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1060                 {
1061                 buf=(unsigned char *)s->init_buf->data;
1062                 p=s->s3->server_random;
1063                 Time=(unsigned long)time(NULL);                 /* Time */
1064                 l2n(Time,p);
1065                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1066                         return -1;
1067                 /* Do the message type and length last */
1068                 d=p= &(buf[4]);
1069
1070                 *(p++)=s->version>>8;
1071                 *(p++)=s->version&0xff;
1072
1073                 /* Random stuff */
1074                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1075                 p+=SSL3_RANDOM_SIZE;
1076
1077                 /* now in theory we have 3 options to sending back the
1078                  * session id.  If it is a re-use, we send back the
1079                  * old session-id, if it is a new session, we send
1080                  * back the new session-id or we send back a 0 length
1081                  * session-id if we want it to be single use.
1082                  * Currently I will not implement the '0' length session-id
1083                  * 12-Jan-98 - I'll now support the '0' length stuff.
1084                  */
1085                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
1086                         s->session->session_id_length=0;
1087
1088                 sl=s->session->session_id_length;
1089                 if (sl > (int)sizeof(s->session->session_id))
1090                         {
1091                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1092                         return -1;
1093                         }
1094                 *(p++)=sl;
1095                 memcpy(p,s->session->session_id,sl);
1096                 p+=sl;
1097
1098                 /* put the cipher */
1099                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1100                 p+=i;
1101
1102                 /* put the compression method */
1103 #ifdef OPENSSL_NO_COMP
1104                         *(p++)=0;
1105 #else
1106                 if (s->s3->tmp.new_compression == NULL)
1107                         *(p++)=0;
1108                 else
1109                         *(p++)=s->s3->tmp.new_compression->id;
1110 #endif
1111 #ifndef OPENSSL_NO_TLSEXT
1112                 if ((p = ssl_add_ServerHello_TLS_extensions(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1113                 {
1114                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1115                         return -1;
1116                 }
1117 #endif
1118
1119                 /* do the header */
1120                 l=(p-d);
1121                 d=buf;
1122                 *(d++)=SSL3_MT_SERVER_HELLO;
1123                 l2n3(l,d);
1124
1125                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
1126                 /* number of bytes to write */
1127                 s->init_num=p-buf;
1128                 s->init_off=0;
1129                 }
1130
1131         /* SSL3_ST_CW_CLNT_HELLO_B */
1132         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1133         }
1134
1135 int ssl3_send_server_done(SSL *s)
1136         {
1137         unsigned char *p;
1138
1139         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1140                 {
1141                 p=(unsigned char *)s->init_buf->data;
1142
1143                 /* do the header */
1144                 *(p++)=SSL3_MT_SERVER_DONE;
1145                 *(p++)=0;
1146                 *(p++)=0;
1147                 *(p++)=0;
1148
1149                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1150                 /* number of bytes to write */
1151                 s->init_num=4;
1152                 s->init_off=0;
1153                 }
1154
1155         /* SSL3_ST_CW_CLNT_HELLO_B */
1156         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1157         }
1158
1159 int ssl3_send_server_key_exchange(SSL *s)
1160         {
1161 #ifndef OPENSSL_NO_RSA
1162         unsigned char *q;
1163         int j,num;
1164         RSA *rsa;
1165         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1166         unsigned int u;
1167 #endif
1168 #ifndef OPENSSL_NO_DH
1169         DH *dh=NULL,*dhp;
1170 #endif
1171 #ifndef OPENSSL_NO_ECDH
1172         EC_KEY *ecdh=NULL, *ecdhp;
1173         unsigned char *encodedPoint = NULL;
1174         int encodedlen = 0;
1175         int curve_id = 0;
1176         BN_CTX *bn_ctx = NULL;
1177 #endif
1178         EVP_PKEY *pkey;
1179         unsigned char *p,*d;
1180         int al,i;
1181         unsigned long type;
1182         int n;
1183         CERT *cert;
1184         BIGNUM *r[4];
1185         int nr[4],kn;
1186         BUF_MEM *buf;
1187         EVP_MD_CTX md_ctx;
1188
1189         EVP_MD_CTX_init(&md_ctx);
1190         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1191                 {
1192                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1193                 cert=s->cert;
1194
1195                 buf=s->init_buf;
1196
1197                 r[0]=r[1]=r[2]=r[3]=NULL;
1198                 n=0;
1199 #ifndef OPENSSL_NO_RSA
1200                 if (type & SSL_kRSA)
1201                         {
1202                         rsa=cert->rsa_tmp;
1203                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1204                                 {
1205                                 rsa=s->cert->rsa_tmp_cb(s,
1206                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1207                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1208                                 if(rsa == NULL)
1209                                 {
1210                                         al=SSL_AD_HANDSHAKE_FAILURE;
1211                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1212                                         goto f_err;
1213                                 }
1214                                 RSA_up_ref(rsa);
1215                                 cert->rsa_tmp=rsa;
1216                                 }
1217                         if (rsa == NULL)
1218                                 {
1219                                 al=SSL_AD_HANDSHAKE_FAILURE;
1220                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1221                                 goto f_err;
1222                                 }
1223                         r[0]=rsa->n;
1224                         r[1]=rsa->e;
1225                         s->s3->tmp.use_rsa_tmp=1;
1226                         }
1227                 else
1228 #endif
1229 #ifndef OPENSSL_NO_DH
1230                         if (type & SSL_kEDH)
1231                         {
1232                         dhp=cert->dh_tmp;
1233                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1234                                 dhp=s->cert->dh_tmp_cb(s,
1235                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1236                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1237                         if (dhp == NULL)
1238                                 {
1239                                 al=SSL_AD_HANDSHAKE_FAILURE;
1240                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1241                                 goto f_err;
1242                                 }
1243
1244                         if (s->s3->tmp.dh != NULL)
1245                                 {
1246                                 DH_free(dh);
1247                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1248                                 goto err;
1249                                 }
1250
1251                         if ((dh=DHparams_dup(dhp)) == NULL)
1252                                 {
1253                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1254                                 goto err;
1255                                 }
1256
1257                         s->s3->tmp.dh=dh;
1258                         if ((dhp->pub_key == NULL ||
1259                              dhp->priv_key == NULL ||
1260                              (s->options & SSL_OP_SINGLE_DH_USE)))
1261                                 {
1262                                 if(!DH_generate_key(dh))
1263                                     {
1264                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1265                                            ERR_R_DH_LIB);
1266                                     goto err;
1267                                     }
1268                                 }
1269                         else
1270                                 {
1271                                 dh->pub_key=BN_dup(dhp->pub_key);
1272                                 dh->priv_key=BN_dup(dhp->priv_key);
1273                                 if ((dh->pub_key == NULL) ||
1274                                         (dh->priv_key == NULL))
1275                                         {
1276                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1277                                         goto err;
1278                                         }
1279                                 }
1280                         r[0]=dh->p;
1281                         r[1]=dh->g;
1282                         r[2]=dh->pub_key;
1283                         }
1284                 else
1285 #endif
1286 #ifndef OPENSSL_NO_ECDH
1287                         if (type & SSL_kECDHE)
1288                         {
1289                         const EC_GROUP *group;
1290
1291                         ecdhp=cert->ecdh_tmp;
1292                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1293                                 {
1294                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1295                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1296                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1297                                 }
1298                         if (ecdhp == NULL)
1299                                 {
1300                                 al=SSL_AD_HANDSHAKE_FAILURE;
1301                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1302                                 goto f_err;
1303                                 }
1304
1305                         if (s->s3->tmp.ecdh != NULL)
1306                                 {
1307                                 EC_KEY_free(s->s3->tmp.ecdh);
1308                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1309                                 goto err;
1310                                 }
1311
1312                         /* Duplicate the ECDH structure. */
1313                         if (ecdhp == NULL)
1314                                 {
1315                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1316                                 goto err;
1317                                 }
1318                         if (!EC_KEY_up_ref(ecdhp))
1319                                 {
1320                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1321                                 goto err;
1322                                 }
1323                         ecdh = ecdhp;
1324
1325                         s->s3->tmp.ecdh=ecdh;
1326                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1327                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1328                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1329                                 {
1330                                 if(!EC_KEY_generate_key(ecdh))
1331                                     {
1332                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1333                                     goto err;
1334                                     }
1335                                 }
1336
1337                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1338                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1339                             (EC_KEY_get0_private_key(ecdh) == NULL))
1340                                 {
1341                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1342                                 goto err;
1343                                 }
1344
1345                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1346                             (EC_GROUP_get_degree(group) > 163))
1347                                 {
1348                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1349                                 goto err;
1350                                 }
1351
1352                         /* XXX: For now, we only support ephemeral ECDH
1353                          * keys over named (not generic) curves. For
1354                          * supported named curves, curve_id is non-zero.
1355                          */
1356                         if ((curve_id =
1357                             nid2curve_id(EC_GROUP_get_curve_name(group)))
1358                             == 0)
1359                                 {
1360                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1361                                 goto err;
1362                                 }
1363
1364                         /* Encode the public key.
1365                          * First check the size of encoding and
1366                          * allocate memory accordingly.
1367                          */
1368                         encodedlen = EC_POINT_point2oct(group,
1369                             EC_KEY_get0_public_key(ecdh),
1370                             POINT_CONVERSION_UNCOMPRESSED,
1371                             NULL, 0, NULL);
1372
1373                         encodedPoint = (unsigned char *)
1374                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1375                         bn_ctx = BN_CTX_new();
1376                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1377                                 {
1378                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1379                                 goto err;
1380                                 }
1381
1382
1383                         encodedlen = EC_POINT_point2oct(group,
1384                             EC_KEY_get0_public_key(ecdh),
1385                             POINT_CONVERSION_UNCOMPRESSED,
1386                             encodedPoint, encodedlen, bn_ctx);
1387
1388                         if (encodedlen == 0)
1389                                 {
1390                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1391                                 goto err;
1392                                 }
1393
1394                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1395
1396                         /* XXX: For now, we only support named (not
1397                          * generic) curves in ECDH ephemeral key exchanges.
1398                          * In this situation, we need four additional bytes
1399                          * to encode the entire ServerECDHParams
1400                          * structure.
1401                          */
1402                         n = 4 + encodedlen;
1403
1404                         /* We'll generate the serverKeyExchange message
1405                          * explicitly so we can set these to NULLs
1406                          */
1407                         r[0]=NULL;
1408                         r[1]=NULL;
1409                         r[2]=NULL;
1410                         r[3]=NULL;
1411                         }
1412                 else
1413 #endif /* !OPENSSL_NO_ECDH */
1414                         {
1415                         al=SSL_AD_HANDSHAKE_FAILURE;
1416                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1417                         goto f_err;
1418                         }
1419                 for (i=0; r[i] != NULL; i++)
1420                         {
1421                         nr[i]=BN_num_bytes(r[i]);
1422                         n+=2+nr[i];
1423                         }
1424
1425                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1426                         {
1427                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1428                                 == NULL)
1429                                 {
1430                                 al=SSL_AD_DECODE_ERROR;
1431                                 goto f_err;
1432                                 }
1433                         kn=EVP_PKEY_size(pkey);
1434                         }
1435                 else
1436                         {
1437                         pkey=NULL;
1438                         kn=0;
1439                         }
1440
1441                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1442                         {
1443                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1444                         goto err;
1445                         }
1446                 d=(unsigned char *)s->init_buf->data;
1447                 p= &(d[4]);
1448
1449                 for (i=0; r[i] != NULL; i++)
1450                         {
1451                         s2n(nr[i],p);
1452                         BN_bn2bin(r[i],p);
1453                         p+=nr[i];
1454                         }
1455
1456 #ifndef OPENSSL_NO_ECDH
1457                 if (type & SSL_kECDHE)
1458                         {
1459                         /* XXX: For now, we only support named (not generic) curves.
1460                          * In this situation, the serverKeyExchange message has:
1461                          * [1 byte CurveType], [2 byte CurveName]
1462                          * [1 byte length of encoded point], followed by
1463                          * the actual encoded point itself
1464                          */
1465                         *p = NAMED_CURVE_TYPE;
1466                         p += 1;
1467                         *p = 0;
1468                         p += 1;
1469                         *p = curve_id;
1470                         p += 1;
1471                         *p = encodedlen;
1472                         p += 1;
1473                         memcpy((unsigned char*)p,
1474                             (unsigned char *)encodedPoint,
1475                             encodedlen);
1476                         OPENSSL_free(encodedPoint);
1477                         p += encodedlen;
1478                         }
1479 #endif
1480
1481                 /* not anonymous */
1482                 if (pkey != NULL)
1483                         {
1484                         /* n is the length of the params, they start at &(d[4])
1485                          * and p points to the space at the end. */
1486 #ifndef OPENSSL_NO_RSA
1487                         if (pkey->type == EVP_PKEY_RSA)
1488                                 {
1489                                 q=md_buf;
1490                                 j=0;
1491                                 for (num=2; num > 0; num--)
1492                                         {
1493                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1494                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1495                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1496                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1497                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1498                                         EVP_DigestFinal_ex(&md_ctx,q,
1499                                                 (unsigned int *)&i);
1500                                         q+=i;
1501                                         j+=i;
1502                                         }
1503                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1504                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1505                                         {
1506                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1507                                         goto err;
1508                                         }
1509                                 s2n(u,p);
1510                                 n+=u+2;
1511                                 }
1512                         else
1513 #endif
1514 #if !defined(OPENSSL_NO_DSA)
1515                                 if (pkey->type == EVP_PKEY_DSA)
1516                                 {
1517                                 /* lets do DSS */
1518                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1519                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1520                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1521                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1522                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1523                                         (unsigned int *)&i,pkey))
1524                                         {
1525                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1526                                         goto err;
1527                                         }
1528                                 s2n(i,p);
1529                                 n+=i+2;
1530                                 }
1531                         else
1532 #endif
1533 #if !defined(OPENSSL_NO_ECDSA)
1534                                 if (pkey->type == EVP_PKEY_EC)
1535                                 {
1536                                 /* let's do ECDSA */
1537                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1538                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1539                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1540                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1541                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1542                                         (unsigned int *)&i,pkey))
1543                                         {
1544                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1545                                         goto err;
1546                                         }
1547                                 s2n(i,p);
1548                                 n+=i+2;
1549                                 }
1550                         else
1551 #endif
1552                                 {
1553                                 /* Is this error check actually needed? */
1554                                 al=SSL_AD_HANDSHAKE_FAILURE;
1555                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1556                                 goto f_err;
1557                                 }
1558                         }
1559
1560                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1561                 l2n3(n,d);
1562
1563                 /* we should now have things packed up, so lets send
1564                  * it off */
1565                 s->init_num=n+4;
1566                 s->init_off=0;
1567                 }
1568
1569         s->state = SSL3_ST_SW_KEY_EXCH_B;
1570         EVP_MD_CTX_cleanup(&md_ctx);
1571         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1572 f_err:
1573         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1574 err:
1575 #ifndef OPENSSL_NO_ECDH
1576         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1577         BN_CTX_free(bn_ctx);
1578 #endif
1579         EVP_MD_CTX_cleanup(&md_ctx);
1580         return(-1);
1581         }
1582
1583 int ssl3_send_certificate_request(SSL *s)
1584         {
1585         unsigned char *p,*d;
1586         int i,j,nl,off,n;
1587         STACK_OF(X509_NAME) *sk=NULL;
1588         X509_NAME *name;
1589         BUF_MEM *buf;
1590
1591         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1592                 {
1593                 buf=s->init_buf;
1594
1595                 d=p=(unsigned char *)&(buf->data[4]);
1596
1597                 /* get the list of acceptable cert types */
1598                 p++;
1599                 n=ssl3_get_req_cert_type(s,p);
1600                 d[0]=n;
1601                 p+=n;
1602                 n++;
1603
1604                 off=n;
1605                 p+=2;
1606                 n+=2;
1607
1608                 sk=SSL_get_client_CA_list(s);
1609                 nl=0;
1610                 if (sk != NULL)
1611                         {
1612                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1613                                 {
1614                                 name=sk_X509_NAME_value(sk,i);
1615                                 j=i2d_X509_NAME(name,NULL);
1616                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1617                                         {
1618                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1619                                         goto err;
1620                                         }
1621                                 p=(unsigned char *)&(buf->data[4+n]);
1622                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1623                                         {
1624                                         s2n(j,p);
1625                                         i2d_X509_NAME(name,&p);
1626                                         n+=2+j;
1627                                         nl+=2+j;
1628                                         }
1629                                 else
1630                                         {
1631                                         d=p;
1632                                         i2d_X509_NAME(name,&p);
1633                                         j-=2; s2n(j,d); j+=2;
1634                                         n+=j;
1635                                         nl+=j;
1636                                         }
1637                                 }
1638                         }
1639                 /* else no CA names */
1640                 p=(unsigned char *)&(buf->data[4+off]);
1641                 s2n(nl,p);
1642
1643                 d=(unsigned char *)buf->data;
1644                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1645                 l2n3(n,d);
1646
1647                 /* we should now have things packed up, so lets send
1648                  * it off */
1649
1650                 s->init_num=n+4;
1651                 s->init_off=0;
1652 #ifdef NETSCAPE_HANG_BUG
1653                 p=(unsigned char *)s->init_buf->data + s->init_num;
1654
1655                 /* do the header */
1656                 *(p++)=SSL3_MT_SERVER_DONE;
1657                 *(p++)=0;
1658                 *(p++)=0;
1659                 *(p++)=0;
1660                 s->init_num += 4;
1661 #endif
1662
1663                 s->state = SSL3_ST_SW_CERT_REQ_B;
1664                 }
1665
1666         /* SSL3_ST_SW_CERT_REQ_B */
1667         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1668 err:
1669         return(-1);
1670         }
1671
1672 int ssl3_get_client_key_exchange(SSL *s)
1673         {
1674         int i,al,ok;
1675         long n;
1676         unsigned long l;
1677         unsigned char *p;
1678 #ifndef OPENSSL_NO_RSA
1679         RSA *rsa=NULL;
1680         EVP_PKEY *pkey=NULL;
1681 #endif
1682 #ifndef OPENSSL_NO_DH
1683         BIGNUM *pub=NULL;
1684         DH *dh_srvr;
1685 #endif
1686 #ifndef OPENSSL_NO_KRB5
1687         KSSL_ERR kssl_err;
1688 #endif /* OPENSSL_NO_KRB5 */
1689
1690 #ifndef OPENSSL_NO_ECDH
1691         EC_KEY *srvr_ecdh = NULL;
1692         EVP_PKEY *clnt_pub_pkey = NULL;
1693         EC_POINT *clnt_ecpoint = NULL;
1694         BN_CTX *bn_ctx = NULL;
1695 #endif
1696
1697         n=s->method->ssl_get_message(s,
1698                 SSL3_ST_SR_KEY_EXCH_A,
1699                 SSL3_ST_SR_KEY_EXCH_B,
1700                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1701                 2048, /* ??? */
1702                 &ok);
1703
1704         if (!ok) return((int)n);
1705         p=(unsigned char *)s->init_msg;
1706
1707         l=s->s3->tmp.new_cipher->algorithms;
1708
1709 #ifndef OPENSSL_NO_RSA
1710         if (l & SSL_kRSA)
1711                 {
1712                 /* FIX THIS UP EAY EAY EAY EAY */
1713                 if (s->s3->tmp.use_rsa_tmp)
1714                         {
1715                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1716                                 rsa=s->cert->rsa_tmp;
1717                         /* Don't do a callback because rsa_tmp should
1718                          * be sent already */
1719                         if (rsa == NULL)
1720                                 {
1721                                 al=SSL_AD_HANDSHAKE_FAILURE;
1722                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1723                                 goto f_err;
1724
1725                                 }
1726                         }
1727                 else
1728                         {
1729                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1730                         if (    (pkey == NULL) ||
1731                                 (pkey->type != EVP_PKEY_RSA) ||
1732                                 (pkey->pkey.rsa == NULL))
1733                                 {
1734                                 al=SSL_AD_HANDSHAKE_FAILURE;
1735                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1736                                 goto f_err;
1737                                 }
1738                         rsa=pkey->pkey.rsa;
1739                         }
1740
1741                 /* TLS */
1742                 if (s->version > SSL3_VERSION)
1743                         {
1744                         n2s(p,i);
1745                         if (n != i+2)
1746                                 {
1747                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1748                                         {
1749                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1750                                         goto err;
1751                                         }
1752                                 else
1753                                         p-=2;
1754                                 }
1755                         else
1756                                 n=i;
1757                         }
1758
1759                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1760
1761                 al = -1;
1762
1763                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1764                         {
1765                         al=SSL_AD_DECODE_ERROR;
1766                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
1767                         }
1768
1769                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1770                         {
1771                         /* The premaster secret must contain the same version number as the
1772                          * ClientHello to detect version rollback attacks (strangely, the
1773                          * protocol does not offer such protection for DH ciphersuites).
1774                          * However, buggy clients exist that send the negotiated protocol
1775                          * version instead if the server does not support the requested
1776                          * protocol version.
1777                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1778                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1779                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1780                                 {
1781                                 al=SSL_AD_DECODE_ERROR;
1782                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1783
1784                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1785                                  * (http://eprint.iacr.org/2003/052/) exploits the version
1786                                  * number check as a "bad version oracle" -- an alert would
1787                                  * reveal that the plaintext corresponding to some ciphertext
1788                                  * made up by the adversary is properly formatted except
1789                                  * that the version number is wrong.  To avoid such attacks,
1790                                  * we should treat this just like any other decryption error. */
1791                                 }
1792                         }
1793
1794                 if (al != -1)
1795                         {
1796                         /* Some decryption failure -- use random value instead as countermeasure
1797                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1798                          * (see RFC 2246, section 7.4.7.1). */
1799                         ERR_clear_error();
1800                         i = SSL_MAX_MASTER_KEY_LENGTH;
1801                         p[0] = s->client_version >> 8;
1802                         p[1] = s->client_version & 0xff;
1803                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
1804                                 goto err;
1805                         }
1806
1807                 s->session->master_key_length=
1808                         s->method->ssl3_enc->generate_master_secret(s,
1809                                 s->session->master_key,
1810                                 p,i);
1811                 OPENSSL_cleanse(p,i);
1812                 }
1813         else
1814 #endif
1815 #ifndef OPENSSL_NO_DH
1816                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1817                 {
1818                 n2s(p,i);
1819                 if (n != i+2)
1820                         {
1821                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1822                                 {
1823                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1824                                 goto err;
1825                                 }
1826                         else
1827                                 {
1828                                 p-=2;
1829                                 i=(int)n;
1830                                 }
1831                         }
1832
1833                 if (n == 0L) /* the parameters are in the cert */
1834                         {
1835                         al=SSL_AD_HANDSHAKE_FAILURE;
1836                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1837                         goto f_err;
1838                         }
1839                 else
1840                         {
1841                         if (s->s3->tmp.dh == NULL)
1842                                 {
1843                                 al=SSL_AD_HANDSHAKE_FAILURE;
1844                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1845                                 goto f_err;
1846                                 }
1847                         else
1848                                 dh_srvr=s->s3->tmp.dh;
1849                         }
1850
1851                 pub=BN_bin2bn(p,i,NULL);
1852                 if (pub == NULL)
1853                         {
1854                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1855                         goto err;
1856                         }
1857
1858                 i=DH_compute_key(p,pub,dh_srvr);
1859
1860                 if (i <= 0)
1861                         {
1862                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1863                         goto err;
1864                         }
1865
1866                 DH_free(s->s3->tmp.dh);
1867                 s->s3->tmp.dh=NULL;
1868
1869                 BN_clear_free(pub);
1870                 pub=NULL;
1871                 s->session->master_key_length=
1872                         s->method->ssl3_enc->generate_master_secret(s,
1873                                 s->session->master_key,p,i);
1874                 OPENSSL_cleanse(p,i);
1875                 }
1876         else
1877 #endif
1878 #ifndef OPENSSL_NO_KRB5
1879         if (l & SSL_kKRB5)
1880                 {
1881                 krb5_error_code         krb5rc;
1882                 krb5_data               enc_ticket;
1883                 krb5_data               authenticator;
1884                 krb5_data               enc_pms;
1885                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
1886                 EVP_CIPHER_CTX          ciph_ctx;
1887                 EVP_CIPHER              *enc = NULL;
1888                 unsigned char           iv[EVP_MAX_IV_LENGTH];
1889                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
1890                                                + EVP_MAX_BLOCK_LENGTH];
1891                 int                     padl, outl;
1892                 krb5_timestamp          authtime = 0;
1893                 krb5_ticket_times       ttimes;
1894
1895                 EVP_CIPHER_CTX_init(&ciph_ctx);
1896
1897                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
1898
1899                 n2s(p,i);
1900                 enc_ticket.length = i;
1901
1902                 if (n < enc_ticket.length + 6)
1903                         {
1904                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1905                                 SSL_R_DATA_LENGTH_TOO_LONG);
1906                         goto err;
1907                         }
1908
1909                 enc_ticket.data = (char *)p;
1910                 p+=enc_ticket.length;
1911
1912                 n2s(p,i);
1913                 authenticator.length = i;
1914
1915                 if (n < enc_ticket.length + authenticator.length + 6)
1916                         {
1917                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1918                                 SSL_R_DATA_LENGTH_TOO_LONG);
1919                         goto err;
1920                         }
1921
1922                 authenticator.data = (char *)p;
1923                 p+=authenticator.length;
1924
1925                 n2s(p,i);
1926                 enc_pms.length = i;
1927                 enc_pms.data = (char *)p;
1928                 p+=enc_pms.length;
1929
1930                 /* Note that the length is checked again below,
1931                 ** after decryption
1932                 */
1933                 if(enc_pms.length > sizeof pms)
1934                         {
1935                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1936                                SSL_R_DATA_LENGTH_TOO_LONG);
1937                         goto err;
1938                         }
1939
1940                 if (n != (long)(enc_ticket.length + authenticator.length +
1941                                                 enc_pms.length + 6))
1942                         {
1943                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1944                                 SSL_R_DATA_LENGTH_TOO_LONG);
1945                         goto err;
1946                         }
1947
1948                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
1949                                         &kssl_err)) != 0)
1950                         {
1951 #ifdef KSSL_DEBUG
1952                         printf("kssl_sget_tkt rtn %d [%d]\n",
1953                                 krb5rc, kssl_err.reason);
1954                         if (kssl_err.text)
1955                                 printf("kssl_err text= %s\n", kssl_err.text);
1956 #endif  /* KSSL_DEBUG */
1957                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1958                                 kssl_err.reason);
1959                         goto err;
1960                         }
1961
1962                 /*  Note: no authenticator is not considered an error,
1963                 **  but will return authtime == 0.
1964                 */
1965                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
1966                                         &authtime, &kssl_err)) != 0)
1967                         {
1968 #ifdef KSSL_DEBUG
1969                         printf("kssl_check_authent rtn %d [%d]\n",
1970                                 krb5rc, kssl_err.reason);
1971                         if (kssl_err.text)
1972                                 printf("kssl_err text= %s\n", kssl_err.text);
1973 #endif  /* KSSL_DEBUG */
1974                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1975                                 kssl_err.reason);
1976                         goto err;
1977                         }
1978
1979                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
1980                         {
1981                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
1982                         goto err;
1983                         }
1984
1985 #ifdef KSSL_DEBUG
1986                 kssl_ctx_show(kssl_ctx);
1987 #endif  /* KSSL_DEBUG */
1988
1989                 enc = kssl_map_enc(kssl_ctx->enctype);
1990                 if (enc == NULL)
1991                     goto err;
1992
1993                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
1994
1995                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
1996                         {
1997                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1998                                 SSL_R_DECRYPTION_FAILED);
1999                         goto err;
2000                         }
2001                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2002                                         (unsigned char *)enc_pms.data, enc_pms.length))
2003                         {
2004                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2005                                 SSL_R_DECRYPTION_FAILED);
2006                         goto err;
2007                         }
2008                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2009                         {
2010                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2011                                 SSL_R_DATA_LENGTH_TOO_LONG);
2012                         goto err;
2013                         }
2014                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2015                         {
2016                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2017                                 SSL_R_DECRYPTION_FAILED);
2018                         goto err;
2019                         }
2020                 outl += padl;
2021                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2022                         {
2023                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2024                                 SSL_R_DATA_LENGTH_TOO_LONG);
2025                         goto err;
2026                         }
2027                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2028
2029                 s->session->master_key_length=
2030                         s->method->ssl3_enc->generate_master_secret(s,
2031                                 s->session->master_key, pms, outl);
2032
2033                 if (kssl_ctx->client_princ)
2034                         {
2035                         int len = strlen(kssl_ctx->client_princ);
2036                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2037                                 {
2038                                 s->session->krb5_client_princ_len = len;
2039                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2040                                 }
2041                         }
2042
2043
2044                 /*  Was doing kssl_ctx_free() here,
2045                 **  but it caused problems for apache.
2046                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2047                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2048                 */
2049                 }
2050         else
2051 #endif  /* OPENSSL_NO_KRB5 */
2052
2053 #ifndef OPENSSL_NO_ECDH
2054                 if ((l & SSL_kECDH) || (l & SSL_kECDHE))
2055                 {
2056                 int ret = 1;
2057                 int field_size = 0;
2058                 const EC_KEY   *tkey;
2059                 const EC_GROUP *group;
2060                 const BIGNUM *priv_key;
2061
2062                 /* initialize structures for server's ECDH key pair */
2063                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2064                         {
2065                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2066                             ERR_R_MALLOC_FAILURE);
2067                         goto err;
2068                         }
2069
2070                 /* Let's get server private key and group information */
2071                 if (l & SSL_kECDH)
2072                         {
2073                         /* use the certificate */
2074                         tkey = s->cert->key->privatekey->pkey.ec;
2075                         }
2076                 else
2077                         {
2078                         /* use the ephermeral values we saved when
2079                          * generating the ServerKeyExchange msg.
2080                          */
2081                         tkey = s->s3->tmp.ecdh;
2082                         }
2083
2084                 group    = EC_KEY_get0_group(tkey);
2085                 priv_key = EC_KEY_get0_private_key(tkey);
2086
2087                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2088                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2089                         {
2090                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2091                                ERR_R_EC_LIB);
2092                         goto err;
2093                         }
2094
2095                 /* Let's get client's public key */
2096                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2097                         {
2098                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2099                             ERR_R_MALLOC_FAILURE);
2100                         goto err;
2101                         }
2102
2103                 if (n == 0L)
2104                         {
2105                         /* Client Publickey was in Client Certificate */
2106
2107                          if (l & SSL_kECDHE)
2108                                  {
2109                                  al=SSL_AD_HANDSHAKE_FAILURE;
2110                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2111                                  goto f_err;
2112                                  }
2113                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2114                             == NULL) ||
2115                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2116                                 {
2117                                 /* XXX: For now, we do not support client
2118                                  * authentication using ECDH certificates
2119                                  * so this branch (n == 0L) of the code is
2120                                  * never executed. When that support is
2121                                  * added, we ought to ensure the key
2122                                  * received in the certificate is
2123                                  * authorized for key agreement.
2124                                  * ECDH_compute_key implicitly checks that
2125                                  * the two ECDH shares are for the same
2126                                  * group.
2127                                  */
2128                                 al=SSL_AD_HANDSHAKE_FAILURE;
2129                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2130                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2131                                 goto f_err;
2132                                 }
2133
2134                         EC_POINT_copy(clnt_ecpoint,
2135                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec));
2136                         ret = 2; /* Skip certificate verify processing */
2137                         }
2138                 else
2139                         {
2140                         /* Get client's public key from encoded point
2141                          * in the ClientKeyExchange message.
2142                          */
2143                         if ((bn_ctx = BN_CTX_new()) == NULL)
2144                                 {
2145                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2146                                     ERR_R_MALLOC_FAILURE);
2147                                 goto err;
2148                                 }
2149
2150                         /* Get encoded point length */
2151                         i = *p;
2152                         p += 1;
2153                         if (EC_POINT_oct2point(group,
2154                             clnt_ecpoint, p, i, bn_ctx) == 0)
2155                                 {
2156                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2157                                     ERR_R_EC_LIB);
2158                                 goto err;
2159                                 }
2160                         /* p is pointing to somewhere in the buffer
2161                          * currently, so set it to the start
2162                          */
2163                         p=(unsigned char *)s->init_buf->data;
2164                         }
2165
2166                 /* Compute the shared pre-master secret */
2167                 field_size = EC_GROUP_get_degree(group);
2168                 if (field_size <= 0)
2169                         {
2170                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2171                                ERR_R_ECDH_LIB);
2172                         goto err;
2173                         }
2174                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2175                 if (i <= 0)
2176                         {
2177                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2178                             ERR_R_ECDH_LIB);
2179                         goto err;
2180                         }
2181
2182                 EVP_PKEY_free(clnt_pub_pkey);
2183                 EC_POINT_free(clnt_ecpoint);
2184                 if (srvr_ecdh != NULL)
2185                         EC_KEY_free(srvr_ecdh);
2186                 BN_CTX_free(bn_ctx);
2187
2188                 /* Compute the master secret */
2189                 s->session->master_key_length = s->method->ssl3_enc-> \
2190                     generate_master_secret(s, s->session->master_key, p, i);
2191
2192                 OPENSSL_cleanse(p, i);
2193                 return (ret);
2194                 }
2195         else
2196 #endif
2197                 {
2198                 al=SSL_AD_HANDSHAKE_FAILURE;
2199                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2200                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2201                 goto f_err;
2202                 }
2203
2204         return(1);
2205 f_err:
2206         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2207 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2208 err:
2209 #endif
2210 #ifndef OPENSSL_NO_ECDH
2211         EVP_PKEY_free(clnt_pub_pkey);
2212         EC_POINT_free(clnt_ecpoint);
2213         if (srvr_ecdh != NULL)
2214                 EC_KEY_free(srvr_ecdh);
2215         BN_CTX_free(bn_ctx);
2216 #endif
2217         return(-1);
2218         }
2219
2220 int ssl3_get_cert_verify(SSL *s)
2221         {
2222         EVP_PKEY *pkey=NULL;
2223         unsigned char *p;
2224         int al,ok,ret=0;
2225         long n;
2226         int type=0,i,j;
2227         X509 *peer;
2228
2229         n=s->method->ssl_get_message(s,
2230                 SSL3_ST_SR_CERT_VRFY_A,
2231                 SSL3_ST_SR_CERT_VRFY_B,
2232                 -1,
2233                 514, /* 514? */
2234                 &ok);
2235
2236         if (!ok) return((int)n);
2237
2238         if (s->session->peer != NULL)
2239                 {
2240                 peer=s->session->peer;
2241                 pkey=X509_get_pubkey(peer);
2242                 type=X509_certificate_type(peer,pkey);
2243                 }
2244         else
2245                 {
2246                 peer=NULL;
2247                 pkey=NULL;
2248                 }
2249
2250         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2251                 {
2252                 s->s3->tmp.reuse_message=1;
2253                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2254                         {
2255                         al=SSL_AD_UNEXPECTED_MESSAGE;
2256                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2257                         goto f_err;
2258                         }
2259                 ret=1;
2260                 goto end;
2261                 }
2262
2263         if (peer == NULL)
2264                 {
2265                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2266                 al=SSL_AD_UNEXPECTED_MESSAGE;
2267                 goto f_err;
2268                 }
2269
2270         if (!(type & EVP_PKT_SIGN))
2271                 {
2272                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2273                 al=SSL_AD_ILLEGAL_PARAMETER;
2274                 goto f_err;
2275                 }
2276
2277         if (s->s3->change_cipher_spec)
2278                 {
2279                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2280                 al=SSL_AD_UNEXPECTED_MESSAGE;
2281                 goto f_err;
2282                 }
2283
2284         /* we now have a signature that we need to verify */
2285         p=(unsigned char *)s->init_msg;
2286         n2s(p,i);
2287         n-=2;
2288         if (i > n)
2289                 {
2290                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2291                 al=SSL_AD_DECODE_ERROR;
2292                 goto f_err;
2293                 }
2294
2295         j=EVP_PKEY_size(pkey);
2296         if ((i > j) || (n > j) || (n <= 0))
2297                 {
2298                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2299                 al=SSL_AD_DECODE_ERROR;
2300                 goto f_err;
2301                 }
2302
2303 #ifndef OPENSSL_NO_RSA
2304         if (pkey->type == EVP_PKEY_RSA)
2305                 {
2306                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2307                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
2308                                                         pkey->pkey.rsa);
2309                 if (i < 0)
2310                         {
2311                         al=SSL_AD_DECRYPT_ERROR;
2312                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2313                         goto f_err;
2314                         }
2315                 if (i == 0)
2316                         {
2317                         al=SSL_AD_DECRYPT_ERROR;
2318                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2319                         goto f_err;
2320                         }
2321                 }
2322         else
2323 #endif
2324 #ifndef OPENSSL_NO_DSA
2325                 if (pkey->type == EVP_PKEY_DSA)
2326                 {
2327                 j=DSA_verify(pkey->save_type,
2328                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2329                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2330                 if (j <= 0)
2331                         {
2332                         /* bad signature */
2333                         al=SSL_AD_DECRYPT_ERROR;
2334                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2335                         goto f_err;
2336                         }
2337                 }
2338         else
2339 #endif
2340 #ifndef OPENSSL_NO_ECDSA
2341                 if (pkey->type == EVP_PKEY_EC)
2342                 {
2343                 j=ECDSA_verify(pkey->save_type,
2344                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2345                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2346                 if (j <= 0)
2347                         {
2348                         /* bad signature */
2349                         al=SSL_AD_DECRYPT_ERROR;
2350                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2351                             SSL_R_BAD_ECDSA_SIGNATURE);
2352                         goto f_err;
2353                         }
2354                 }
2355         else
2356 #endif
2357                 {
2358                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2359                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2360                 goto f_err;
2361                 }
2362
2363
2364         ret=1;
2365         if (0)
2366                 {
2367 f_err:
2368                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2369                 }
2370 end:
2371         EVP_PKEY_free(pkey);
2372         return(ret);
2373         }
2374
2375 int ssl3_get_client_certificate(SSL *s)
2376         {
2377         int i,ok,al,ret= -1;
2378         X509 *x=NULL;
2379         unsigned long l,nc,llen,n;
2380         const unsigned char *p,*q;
2381         unsigned char *d;
2382         STACK_OF(X509) *sk=NULL;
2383
2384         n=s->method->ssl_get_message(s,
2385                 SSL3_ST_SR_CERT_A,
2386                 SSL3_ST_SR_CERT_B,
2387                 -1,
2388                 s->max_cert_list,
2389                 &ok);
2390
2391         if (!ok) return((int)n);
2392
2393         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2394                 {
2395                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2396                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2397                         {
2398                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2399                         al=SSL_AD_HANDSHAKE_FAILURE;
2400                         goto f_err;
2401                         }
2402                 /* If tls asked for a client cert, the client must return a 0 list */
2403                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2404                         {
2405                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2406                         al=SSL_AD_UNEXPECTED_MESSAGE;
2407                         goto f_err;
2408                         }
2409                 s->s3->tmp.reuse_message=1;
2410                 return(1);
2411                 }
2412
2413         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2414                 {
2415                 al=SSL_AD_UNEXPECTED_MESSAGE;
2416                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2417                 goto f_err;
2418                 }
2419         p=d=(unsigned char *)s->init_msg;
2420
2421         if ((sk=sk_X509_new_null()) == NULL)
2422                 {
2423                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2424                 goto err;
2425                 }
2426
2427         n2l3(p,llen);
2428         if (llen+3 != n)
2429                 {
2430                 al=SSL_AD_DECODE_ERROR;
2431                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2432                 goto f_err;
2433                 }
2434         for (nc=0; nc<llen; )
2435                 {
2436                 n2l3(p,l);
2437                 if ((l+nc+3) > llen)
2438                         {
2439                         al=SSL_AD_DECODE_ERROR;
2440                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2441                         goto f_err;
2442                         }
2443
2444                 q=p;
2445                 x=d2i_X509(NULL,&p,l);
2446                 if (x == NULL)
2447                         {
2448                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2449                         goto err;
2450                         }
2451                 if (p != (q+l))
2452                         {
2453                         al=SSL_AD_DECODE_ERROR;
2454                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2455                         goto f_err;
2456                         }
2457                 if (!sk_X509_push(sk,x))
2458                         {
2459                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2460                         goto err;
2461                         }
2462                 x=NULL;
2463                 nc+=l+3;
2464                 }
2465
2466         if (sk_X509_num(sk) <= 0)
2467                 {
2468                 /* TLS does not mind 0 certs returned */
2469                 if (s->version == SSL3_VERSION)
2470                         {
2471                         al=SSL_AD_HANDSHAKE_FAILURE;
2472                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2473                         goto f_err;
2474                         }
2475                 /* Fail for TLS only if we required a certificate */
2476                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2477                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2478                         {
2479                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2480                         al=SSL_AD_HANDSHAKE_FAILURE;
2481                         goto f_err;
2482                         }
2483                 }
2484         else
2485                 {
2486                 i=ssl_verify_cert_chain(s,sk);
2487                 if (!i)
2488                         {
2489                         al=ssl_verify_alarm_type(s->verify_result);
2490                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2491                         goto f_err;
2492                         }
2493                 }
2494
2495         if (s->session->peer != NULL) /* This should not be needed */
2496                 X509_free(s->session->peer);
2497         s->session->peer=sk_X509_shift(sk);
2498         s->session->verify_result = s->verify_result;
2499
2500         /* With the current implementation, sess_cert will always be NULL
2501          * when we arrive here. */
2502         if (s->session->sess_cert == NULL)
2503                 {
2504                 s->session->sess_cert = ssl_sess_cert_new();
2505                 if (s->session->sess_cert == NULL)
2506                         {
2507                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2508                         goto err;
2509                         }
2510                 }
2511         if (s->session->sess_cert->cert_chain != NULL)
2512                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2513         s->session->sess_cert->cert_chain=sk;
2514         /* Inconsistency alert: cert_chain does *not* include the
2515          * peer's own certificate, while we do include it in s3_clnt.c */
2516
2517         sk=NULL;
2518
2519         ret=1;
2520         if (0)
2521                 {
2522 f_err:
2523                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2524                 }
2525 err:
2526         if (x != NULL) X509_free(x);
2527         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2528         return(ret);
2529         }
2530
2531 int ssl3_send_server_certificate(SSL *s)
2532         {
2533         unsigned long l;
2534         X509 *x;
2535
2536         if (s->state == SSL3_ST_SW_CERT_A)
2537                 {
2538                 x=ssl_get_server_send_cert(s);
2539                 if (x == NULL &&
2540                         /* VRS: allow null cert if auth == KRB5 */
2541                         (s->s3->tmp.new_cipher->algorithms
2542                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
2543                         != (SSL_aKRB5|SSL_kKRB5))
2544                         {
2545                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2546                         return(0);
2547                         }
2548
2549                 l=ssl3_output_cert_chain(s,x);
2550                 s->state=SSL3_ST_SW_CERT_B;
2551                 s->init_num=(int)l;
2552                 s->init_off=0;
2553                 }
2554
2555         /* SSL3_ST_SW_CERT_B */
2556         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2557         }
2558
2559
2560 #ifndef OPENSSL_NO_ECDH
2561 /* This is the complement of curve_id2nid in s3_clnt.c. */
2562 static int nid2curve_id(int nid)
2563 {
2564         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2565          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2566         switch (nid) {
2567         case NID_sect163k1: /* sect163k1 (1) */
2568                 return 1;
2569         case NID_sect163r1: /* sect163r1 (2) */
2570                 return 2;
2571         case NID_sect163r2: /* sect163r2 (3) */
2572                 return 3;
2573         case NID_sect193r1: /* sect193r1 (4) */
2574                 return 4;
2575         case NID_sect193r2: /* sect193r2 (5) */
2576                 return 5;
2577         case NID_sect233k1: /* sect233k1 (6) */
2578                 return 6;
2579         case NID_sect233r1: /* sect233r1 (7) */
2580                 return 7;
2581         case NID_sect239k1: /* sect239k1 (8) */
2582                 return 8;
2583         case NID_sect283k1: /* sect283k1 (9) */
2584                 return 9;
2585         case NID_sect283r1: /* sect283r1 (10) */
2586                 return 10;
2587         case NID_sect409k1: /* sect409k1 (11) */
2588                 return 11;
2589         case NID_sect409r1: /* sect409r1 (12) */
2590                 return 12;
2591         case NID_sect571k1: /* sect571k1 (13) */
2592                 return 13;
2593         case NID_sect571r1: /* sect571r1 (14) */
2594                 return 14;
2595         case NID_secp160k1: /* secp160k1 (15) */
2596                 return 15;
2597         case NID_secp160r1: /* secp160r1 (16) */
2598                 return 16;
2599         case NID_secp160r2: /* secp160r2 (17) */
2600                 return 17;
2601         case NID_secp192k1: /* secp192k1 (18) */
2602                 return 18;
2603         case NID_X9_62_prime192v1: /* secp192r1 (19) */
2604                 return 19;
2605         case NID_secp224k1: /* secp224k1 (20) */
2606                 return 20;
2607         case NID_secp224r1: /* secp224r1 (21) */
2608                 return 21;
2609         case NID_secp256k1: /* secp256k1 (22) */
2610                 return 22;
2611         case NID_X9_62_prime256v1: /* secp256r1 (23) */
2612                 return 23;
2613         case NID_secp384r1: /* secp384r1 (24) */
2614                 return 24;
2615         case NID_secp521r1:  /* secp521r1 (25) */
2616                 return 25;
2617         default:
2618                 return 0;
2619         }
2620 }
2621 #endif