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 #include <openssl/dh.h>
 137 #include <openssl/bn.h>
 138 #ifndef OPENSSL_NO_KRB5
 139 #include <openssl/krb5_asn.h>
 140 #endif
 141 #include <openssl/md5.h>
 142
 143 static SSL_METHOD *ssl3_get_server_method(int ver);
 144
 145 #ifndef OPENSSL_NO_ECDH
 146 static int nid2curve_id(int nid);
 147 #endif
 148
 149 static SSL_METHOD *ssl3_get_server_method(int ver)
 150         {
 151         if (ver == SSL3_VERSION)
 152                 return(SSLv3_server_method());
 153         else
 154                 return(NULL);
 155         }
 156
 157 SSL_METHOD *SSLv3_server_method(void)
 158         {
 159         static int init=1;
 160         static SSL_METHOD SSLv3_server_data;
 161
 162         if (init)
 163                 {
 164                 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
 165
 166                 if (init)
 167                         {
 168                         memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
 169                                 sizeof(SSL_METHOD));
 170                         SSLv3_server_data.ssl_accept=ssl3_accept;
 171                         SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
 172                         init=0;
 173                         }
 174
 175                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
 176                 }
 177         return(&SSLv3_server_data);
 178         }
 179
 180 int ssl3_accept(SSL *s)
 181         {
 182         BUF_MEM *buf;
 183         unsigned long l,Time=time(NULL);
 184         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 185         long num1;
 186         int ret= -1;
 187         int new_state,state,skip=0;
 188
 189         RAND_add(&Time,sizeof(Time),0);
 190         ERR_clear_error();
 191         clear_sys_error();
 192
 193         if (s->info_callback != NULL)
 194                 cb=s->info_callback;
 195         else if (s->ctx->info_callback != NULL)
 196                 cb=s->ctx->info_callback;
 197
 198         /* init things to blank */
 199         s->in_handshake++;
 200         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 201
 202         if (s->cert == NULL)
 203                 {
 204                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 205                 return(-1);
 206                 }
 207
 208         for (;;)
 209                 {
 210                 state=s->state;
 211
 212                 switch (s->state)
 213                         {
 214                 case SSL_ST_RENEGOTIATE:
 215                         s->new_session=1;
 216                         /* s->state=SSL_ST_ACCEPT; */
 217
 218                 case SSL_ST_BEFORE:
 219                 case SSL_ST_ACCEPT:
 220                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 221                 case SSL_ST_OK|SSL_ST_ACCEPT:
 222
 223                         s->server=1;
 224                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 225
 226                         if ((s->version>>8) != 3)
 227                                 {
 228                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 229                                 return -1;
 230                                 }
 231                         s->type=SSL_ST_ACCEPT;
 232
 233                         if (s->init_buf == NULL)
 234                                 {
 235                                 if ((buf=BUF_MEM_new()) == NULL)
 236                                         {
 237                                         ret= -1;
 238                                         goto end;
 239                                         }
 240                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 241                                         {
 242                                         ret= -1;
 243                                         goto end;
 244                                         }
 245                                 s->init_buf=buf;
 246                                 }
 247
 248                         if (!ssl3_setup_buffers(s))
 249                                 {
 250                                 ret= -1;
 251                                 goto end;
 252                                 }
 253
 254                         s->init_num=0;
 255
 256                         if (s->state != SSL_ST_RENEGOTIATE)
 257                                 {
 258                                 /* Ok, we now need to push on a buffering BIO so that
 259                                  * the output is sent in a way that TCP likes :-)
 260                                  */
 261                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 262
 263                                 ssl3_init_finished_mac(s);
 264                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 265                                 s->ctx->stats.sess_accept++;
 266                                 }
 267                         else
 268                                 {
 269                                 /* s->state == SSL_ST_RENEGOTIATE,
 270                                  * we will just send a HelloRequest */
 271                                 s->ctx->stats.sess_accept_renegotiate++;
 272                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 273                                 }
 274                         break;
 275
 276                 case SSL3_ST_SW_HELLO_REQ_A:
 277                 case SSL3_ST_SW_HELLO_REQ_B:
 278
 279                         s->shutdown=0;
 280                         ret=ssl3_send_hello_request(s);
 281                         if (ret <= 0) goto end;
 282                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 283                         s->state=SSL3_ST_SW_FLUSH;
 284                         s->init_num=0;
 285
 286                         ssl3_init_finished_mac(s);
 287                         break;
 288
 289                 case SSL3_ST_SW_HELLO_REQ_C:
 290                         s->state=SSL_ST_OK;
 291                         break;
 292
 293                 case SSL3_ST_SR_CLNT_HELLO_A:
 294                 case SSL3_ST_SR_CLNT_HELLO_B:
 295                 case SSL3_ST_SR_CLNT_HELLO_C:
 296
 297                         s->shutdown=0;
 298                         ret=ssl3_get_client_hello(s);
 299                         if (ret <= 0) goto end;
 300                         s->new_session = 2;
 301                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 302                         s->init_num=0;
 303                         break;
 304
 305                 case SSL3_ST_SW_SRVR_HELLO_A:
 306                 case SSL3_ST_SW_SRVR_HELLO_B:
 307                         ret=ssl3_send_server_hello(s);
 308                         if (ret <= 0) goto end;
 309
 310                         if (s->hit)
 311                                 s->state=SSL3_ST_SW_CHANGE_A;
 312                         else
 313                                 s->state=SSL3_ST_SW_CERT_A;
 314                         s->init_num=0;
 315                         break;
 316
 317                 case SSL3_ST_SW_CERT_A:
 318                 case SSL3_ST_SW_CERT_B:
 319                         /* Check if it is anon DH or anon ECDH */
 320                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 321                                 {
 322                                 ret=ssl3_send_server_certificate(s);
 323                                 if (ret <= 0) goto end;
 324                                 }
 325                         else
 326                                 skip=1;
 327                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 328                         s->init_num=0;
 329                         break;
 330
 331                 case SSL3_ST_SW_KEY_EXCH_A:
 332                 case SSL3_ST_SW_KEY_EXCH_B:
 333                         l=s->s3->tmp.new_cipher->algorithms;
 334
 335                         /* clear this, it may get reset by
 336                          * send_server_key_exchange */
 337                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 338 #ifndef OPENSSL_NO_KRB5
 339                                 && !(l & SSL_KRB5)
 340 #endif /* OPENSSL_NO_KRB5 */
 341                                 )
 342                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 343                                  * even when forbidden by protocol specs
 344                                  * (handshake may fail as clients are not required to
 345                                  * be able to handle this) */
 346                                 s->s3->tmp.use_rsa_tmp=1;
 347                         else
 348                                 s->s3->tmp.use_rsa_tmp=0;
 349
 350
 351                         /* only send if a DH key exchange, fortezza or
 352                          * RSA but we have a sign only certificate
 353                          *
 354                          * For ECC ciphersuites, we send a serverKeyExchange
 355                          * message only if the cipher suite is either
 356                          * ECDH-anon or ECDHE. In other cases, the
 357                          * server certificate contains the server's
 358                          * public key for key exchange.
 359                          */
 360                         if (s->s3->tmp.use_rsa_tmp
 361                             || (l & SSL_kECDHE)
 362                             || (l & (SSL_DH|SSL_kFZA))
 363                             || ((l & SSL_kRSA)
 364                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 365                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 366                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 367                                         )
 368                                     )
 369                                 )
 370                             )
 371                                 {
 372                                 ret=ssl3_send_server_key_exchange(s);
 373                                 if (ret <= 0) goto end;
 374                                 }
 375                         else
 376                                 skip=1;
 377
 378                         s->state=SSL3_ST_SW_CERT_REQ_A;
 379                         s->init_num=0;
 380                         break;
 381
 382                 case SSL3_ST_SW_CERT_REQ_A:
 383                 case SSL3_ST_SW_CERT_REQ_B:
 384                         if (/* don't request cert unless asked for it: */
 385                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 386                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 387                                  * don't request cert during re-negotiation: */
 388                                 ((s->session->peer != NULL) &&
 389                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 390                                 /* never request cert in anonymous ciphersuites
 391                                  * (see section "Certificate request" in SSL 3 drafts
 392                                  * and in RFC 2246): */
 393                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 394                                  /* ... except when the application insists on verification
 395                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 396                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 397                                  /* never request cert in Kerberos ciphersuites */
 398                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 399                                 {
 400                                 /* no cert request */
 401                                 skip=1;
 402                                 s->s3->tmp.cert_request=0;
 403                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 404                                 }
 405                         else
 406                                 {
 407                                 s->s3->tmp.cert_request=1;
 408                                 ret=ssl3_send_certificate_request(s);
 409                                 if (ret <= 0) goto end;
 410 #ifndef NETSCAPE_HANG_BUG
 411                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 412 #else
 413                                 s->state=SSL3_ST_SW_FLUSH;
 414                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 415 #endif
 416                                 s->init_num=0;
 417                                 }
 418                         break;
 419
 420                 case SSL3_ST_SW_SRVR_DONE_A:
 421                 case SSL3_ST_SW_SRVR_DONE_B:
 422                         ret=ssl3_send_server_done(s);
 423                         if (ret <= 0) goto end;
 424                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 425                         s->state=SSL3_ST_SW_FLUSH;
 426                         s->init_num=0;
 427                         break;
 428
 429                 case SSL3_ST_SW_FLUSH:
 430                         /* number of bytes to be flushed */
 431                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 432                         if (num1 > 0)
 433                                 {
 434                                 s->rwstate=SSL_WRITING;
 435                                 num1=BIO_flush(s->wbio);
 436                                 if (num1 <= 0) { ret= -1; goto end; }
 437                                 s->rwstate=SSL_NOTHING;
 438                                 }
 439
 440                         s->state=s->s3->tmp.next_state;
 441                         break;
 442
 443                 case SSL3_ST_SR_CERT_A:
 444                 case SSL3_ST_SR_CERT_B:
 445                         /* Check for second client hello (MS SGC) */
 446                         ret = ssl3_check_client_hello(s);
 447                         if (ret <= 0)
 448                                 goto end;
 449                         if (ret == 2)
 450                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 451                         else {
 452                                 if (s->s3->tmp.cert_request)
 453                                         {
 454                                         ret=ssl3_get_client_certificate(s);
 455                                         if (ret <= 0) goto end;
 456                                         }
 457                                 s->init_num=0;
 458                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 459                         }
 460                         break;
 461
 462                 case SSL3_ST_SR_KEY_EXCH_A:
 463                 case SSL3_ST_SR_KEY_EXCH_B:
 464                         ret=ssl3_get_client_key_exchange(s);
 465                         if (ret <= 0)
 466                                 goto end;
 467                         if (ret == 2)
 468                                 {
 469                                 /* For the ECDH ciphersuites when
 470                                  * the client sends its ECDH pub key in
 471                                  * a certificate, the CertificateVerify
 472                                  * message is not sent.
 473                                  */
 474                                 s->state=SSL3_ST_SR_FINISHED_A;
 475                                 s->init_num = 0;
 476                                 }
 477                         else
 478                                 {
 479                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 480                                 s->init_num=0;
 481
 482                                 /* We need to get hashes here so if there is
 483                                  * a client cert, it can be verified
 484                                  */
 485                                 s->method->ssl3_enc->cert_verify_mac(s,
 486                                     &(s->s3->finish_dgst1),
 487                                     &(s->s3->tmp.cert_verify_md[0]));
 488                                 s->method->ssl3_enc->cert_verify_mac(s,
 489                                     &(s->s3->finish_dgst2),
 490                                     &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 491                                 }
 492                         break;
 493
 494                 case SSL3_ST_SR_CERT_VRFY_A:
 495                 case SSL3_ST_SR_CERT_VRFY_B:
 496
 497                         /* we should decide if we expected this one */
 498                         ret=ssl3_get_cert_verify(s);
 499                         if (ret <= 0) goto end;
 500
 501                         s->state=SSL3_ST_SR_FINISHED_A;
 502                         s->init_num=0;
 503                         break;
 504
 505                 case SSL3_ST_SR_FINISHED_A:
 506                 case SSL3_ST_SR_FINISHED_B:
 507                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 508                                 SSL3_ST_SR_FINISHED_B);
 509                         if (ret <= 0) goto end;
 510                         if (s->hit)
 511                                 s->state=SSL_ST_OK;
 512                         else
 513                                 s->state=SSL3_ST_SW_CHANGE_A;
 514                         s->init_num=0;
 515                         break;
 516
 517                 case SSL3_ST_SW_CHANGE_A:
 518                 case SSL3_ST_SW_CHANGE_B:
 519
 520                         s->session->cipher=s->s3->tmp.new_cipher;
 521                         if (!s->method->ssl3_enc->setup_key_block(s))
 522                                 { ret= -1; goto end; }
 523
 524                         ret=ssl3_send_change_cipher_spec(s,
 525                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 526
 527                         if (ret <= 0) goto end;
 528                         s->state=SSL3_ST_SW_FINISHED_A;
 529                         s->init_num=0;
 530
 531                         if (!s->method->ssl3_enc->change_cipher_state(s,
 532                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 533                                 {
 534                                 ret= -1;
 535                                 goto end;
 536                                 }
 537
 538                         break;
 539
 540                 case SSL3_ST_SW_FINISHED_A:
 541                 case SSL3_ST_SW_FINISHED_B:
 542                         ret=ssl3_send_finished(s,
 543                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 544                                 s->method->ssl3_enc->server_finished_label,
 545                                 s->method->ssl3_enc->server_finished_label_len);
 546                         if (ret <= 0) goto end;
 547                         s->state=SSL3_ST_SW_FLUSH;
 548                         if (s->hit)
 549                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 550                         else
 551                                 s->s3->tmp.next_state=SSL_ST_OK;
 552                         s->init_num=0;
 553                         break;
 554
 555                 case SSL_ST_OK:
 556                         /* clean a few things up */
 557                         ssl3_cleanup_key_block(s);
 558
 559                         BUF_MEM_free(s->init_buf);
 560                         s->init_buf=NULL;
 561
 562                         /* remove buffering on output */
 563                         ssl_free_wbio_buffer(s);
 564
 565                         s->init_num=0;
 566
 567                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 568                                 {
 569                                 /* actually not necessarily a 'new' session unless
 570                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 571
 572                                 s->new_session=0;
 573
 574                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 575
 576                                 s->ctx->stats.sess_accept_good++;
 577                                 /* s->server=1; */
 578                                 s->handshake_func=ssl3_accept;
 579
 580                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 581                                 }
 582
 583                         ret = 1;
 584                         goto end;
 585                         /* break; */
 586
 587                 default:
 588                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 589                         ret= -1;
 590                         goto end;
 591                         /* break; */
 592                         }
 593
 594                 if (!s->s3->tmp.reuse_message && !skip)
 595                         {
 596                         if (s->debug)
 597                                 {
 598                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 599                                         goto end;
 600                                 }
 601
 602
 603                         if ((cb != NULL) && (s->state != state))
 604                                 {
 605                                 new_state=s->state;
 606                                 s->state=state;
 607                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 608                                 s->state=new_state;
 609                                 }
 610                         }
 611                 skip=0;
 612                 }
 613 end:
 614         /* BIO_flush(s->wbio); */
 615
 616         s->in_handshake--;
 617         if (cb != NULL)
 618                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 619         return(ret);
 620         }
 621
 622 int ssl3_send_hello_request(SSL *s)
 623         {
 624         unsigned char *p;
 625
 626         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 627                 {
 628                 p=(unsigned char *)s->init_buf->data;
 629                 *(p++)=SSL3_MT_HELLO_REQUEST;
 630                 *(p++)=0;
 631                 *(p++)=0;
 632                 *(p++)=0;
 633
 634                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 635                 /* number of bytes to write */
 636                 s->init_num=4;
 637                 s->init_off=0;
 638                 }
 639
 640         /* SSL3_ST_SW_HELLO_REQ_B */
 641         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 642         }
 643
 644 int ssl3_check_client_hello(SSL *s)
 645         {
 646         int ok;
 647         long n;
 648
 649         /* this function is called when we really expect a Certificate message,
 650          * so permit appropriate message length */
 651         n=s->method->ssl_get_message(s,
 652                 SSL3_ST_SR_CERT_A,
 653                 SSL3_ST_SR_CERT_B,
 654                 -1,
 655                 s->max_cert_list,
 656                 &ok);
 657         if (!ok) return((int)n);
 658         s->s3->tmp.reuse_message = 1;
 659         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 660                 {
 661                 /* Throw away what we have done so far in the current handshake,
 662                  * which will now be aborted. (A full SSL_clear would be too much.)
 663                  * I hope that tmp.dh is the only thing that may need to be cleared
 664                  * when a handshake is not completed ... */
 665 #ifndef OPENSSL_NO_DH
 666                 if (s->s3->tmp.dh != NULL)
 667                         {
 668                         DH_free(s->s3->tmp.dh);
 669                         s->s3->tmp.dh = NULL;
 670                         }
 671 #endif
 672                 return 2;
 673                 }
 674         return 1;
 675 }
 676
 677 int ssl3_get_client_hello(SSL *s)
 678         {
 679         int i,j,ok,al,ret= -1;
 680         unsigned int cookie_len;
 681         long n;
 682         unsigned long id;
 683         unsigned char *p,*d,*q;
 684         SSL_CIPHER *c;
 685         SSL_COMP *comp=NULL;
 686         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 687
 688         /* We do this so that we will respond with our native type.
 689          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 690          * This down switching should be handled by a different method.
 691          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 692          * TLSv1.
 693          */
 694         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 695                 {
 696                 s->first_packet=1;
 697                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 698                 }
 699         n=s->method->ssl_get_message(s,
 700                 SSL3_ST_SR_CLNT_HELLO_B,
 701                 SSL3_ST_SR_CLNT_HELLO_C,
 702                 SSL3_MT_CLIENT_HELLO,
 703                 SSL3_RT_MAX_PLAIN_LENGTH,
 704                 &ok);
 705
 706         if (!ok) return((int)n);
 707         d=p=(unsigned char *)s->init_msg;
 708
 709         /* use version from inside client hello, not from record header
 710          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 711         s->client_version=(((int)p[0])<<8)|(int)p[1];
 712         p+=2;
 713
 714         if (s->client_version < s->version)
 715                 {
 716                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 717                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 718                         {
 719                         /* similar to ssl3_get_record, send alert using remote version number */
 720                         s->version = s->client_version;
 721                         }
 722                 al = SSL_AD_PROTOCOL_VERSION;
 723                 goto f_err;
 724                 }
 725
 726         /* load the client random */
 727         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 728         p+=SSL3_RANDOM_SIZE;
 729
 730         /* get the session-id */
 731         j= *(p++);
 732
 733         s->hit=0;
 734         /* Versions before 0.9.7 always allow session reuse during renegotiation
 735          * (i.e. when s->new_session is true), option
 736          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
 737          * Maybe this optional behaviour should always have been the default,
 738          * but we cannot safely change the default behaviour (or new applications
 739          * might be written that become totally unsecure when compiled with
 740          * an earlier library version)
 741          */
 742         if (j == 0 || (s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 743                 {
 744                 if (!ssl_get_new_session(s,1))
 745                         goto err;
 746                 }
 747         else
 748                 {
 749                 i=ssl_get_prev_session(s,p,j);
 750                 if (i == 1)
 751                         { /* previous session */
 752                         s->hit=1;
 753                         }
 754                 else if (i == -1)
 755                         goto err;
 756                 else /* i == 0 */
 757                         {
 758                         if (!ssl_get_new_session(s,1))
 759                                 goto err;
 760                         }
 761                 }
 762
 763         p+=j;
 764
 765         if (SSL_version(s) == DTLS1_VERSION)
 766                 {
 767                 /* cookie stuff */
 768                 cookie_len = *(p++);
 769
 770                 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 771                         s->d1->send_cookie == 0)
 772                         {
 773                         /* HelloVerifyMessage has already been sent */
 774                         if ( cookie_len != s->d1->cookie_len)
 775                                 {
 776                                 al = SSL_AD_HANDSHAKE_FAILURE;
 777                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 778                                 goto f_err;
 779                                 }
 780                         }
 781
 782                 /*
 783                  * The ClientHello may contain a cookie even if the
 784                  * HelloVerify message has not been sent--make sure that it
 785                  * does not cause an overflow.
 786                  */
 787                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
 788                         {
 789                         /* too much data */
 790                         al = SSL_AD_DECODE_ERROR;
 791                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 792                         goto f_err;
 793                         }
 794
 795                 /* verify the cookie if appropriate option is set. */
 796                 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 797                         cookie_len > 0)
 798                         {
 799                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
 800
 801                         if ( s->ctx->app_verify_cookie_cb != NULL)
 802                                 {
 803                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
 804                                         cookie_len) == 0)
 805                                         {
 806                                         al=SSL_AD_HANDSHAKE_FAILURE;
 807                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 808                                                 SSL_R_COOKIE_MISMATCH);
 809                                         goto f_err;
 810                                         }
 811                                 /* else cookie verification succeeded */
 812                                 }
 813                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
 814                                                   s->d1->cookie_len) != 0) /* default verification */
 815                                 {
 816                                         al=SSL_AD_HANDSHAKE_FAILURE;
 817                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 818                                                 SSL_R_COOKIE_MISMATCH);
 819                                         goto f_err;
 820                                 }
 821                         }
 822
 823                 p += cookie_len;
 824                 }
 825
 826         n2s(p,i);
 827         if ((i == 0) && (j != 0))
 828                 {
 829                 /* we need a cipher if we are not resuming a session */
 830                 al=SSL_AD_ILLEGAL_PARAMETER;
 831                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 832                 goto f_err;
 833                 }
 834         if ((p+i) >= (d+n))
 835                 {
 836                 /* not enough data */
 837                 al=SSL_AD_DECODE_ERROR;
 838                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 839                 goto f_err;
 840                 }
 841         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 842                 == NULL))
 843                 {
 844                 goto err;
 845                 }
 846         p+=i;
 847
 848         /* If it is a hit, check that the cipher is in the list */
 849         if ((s->hit) && (i > 0))
 850                 {
 851                 j=0;
 852                 id=s->session->cipher->id;
 853
 854 #ifdef CIPHER_DEBUG
 855                 printf("client sent %d ciphers\n",sk_num(ciphers));
 856 #endif
 857                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 858                         {
 859                         c=sk_SSL_CIPHER_value(ciphers,i);
 860 #ifdef CIPHER_DEBUG
 861                         printf("client [%2d of %2d]:%s\n",
 862                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 863 #endif
 864                         if (c->id == id)
 865                                 {
 866                                 j=1;
 867                                 break;
 868                                 }
 869                         }
 870                 if (j == 0)
 871                         {
 872                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 873                                 {
 874                                 /* Very bad for multi-threading.... */
 875                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers, 0);
 876                                 }
 877                         else
 878                                 {
 879                                 /* we need to have the cipher in the cipher
 880                                  * list if we are asked to reuse it */
 881                                 al=SSL_AD_ILLEGAL_PARAMETER;
 882                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 883                                 goto f_err;
 884                                 }
 885                         }
 886                 }
 887
 888         /* compression */
 889         i= *(p++);
 890         if ((p+i) > (d+n))
 891                 {
 892                 /* not enough data */
 893                 al=SSL_AD_DECODE_ERROR;
 894                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 895                 goto f_err;
 896                 }
 897         q=p;
 898         for (j=0; j<i; j++)
 899                 {
 900                 if (p[j] == 0) break;
 901                 }
 902
 903         p+=i;
 904         if (j >= i)
 905                 {
 906                 /* no compress */
 907                 al=SSL_AD_DECODE_ERROR;
 908                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 909                 goto f_err;
 910                 }
 911
 912         /* Worst case, we will use the NULL compression, but if we have other
 913          * options, we will now look for them.  We have i-1 compression
 914          * algorithms from the client, starting at q. */
 915         s->s3->tmp.new_compression=NULL;
 916         if (s->ctx->comp_methods != NULL)
 917                 { /* See if we have a match */
 918                 int m,nn,o,v,done=0;
 919
 920                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
 921                 for (m=0; m<nn; m++)
 922                         {
 923                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
 924                         v=comp->id;
 925                         for (o=0; o<i; o++)
 926                                 {
 927                                 if (v == q[o])
 928                                         {
 929                                         done=1;
 930                                         break;
 931                                         }
 932                                 }
 933                         if (done) break;
 934                         }
 935                 if (done)
 936                         s->s3->tmp.new_compression=comp;
 937                 else
 938                         comp=NULL;
 939                 }
 940
 941         /* TLS does not mind if there is extra stuff */
 942 #if 0   /* SSL 3.0 does not mind either, so we should disable this test
 943          * (was enabled in 0.9.6d through 0.9.6j and 0.9.7 through 0.9.7b,
 944          * in earlier SSLeay/OpenSSL releases this test existed but was buggy) */
 945         if (s->version == SSL3_VERSION)
 946                 {
 947                 if (p < (d+n))
 948                         {
 949                         /* wrong number of bytes,
 950                          * there could be more to follow */
 951                         al=SSL_AD_DECODE_ERROR;
 952                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 953                         goto f_err;
 954                         }
 955                 }
 956 #endif
 957
 958         /* Given s->session->ciphers and SSL_get_ciphers, we must
 959          * pick a cipher */
 960
 961         if (!s->hit)
 962                 {
 963                 s->session->compress_meth=(comp == NULL)?0:comp->id;
 964                 if (s->session->ciphers != NULL)
 965                         sk_SSL_CIPHER_free(s->session->ciphers);
 966                 s->session->ciphers=ciphers;
 967                 if (ciphers == NULL)
 968                         {
 969                         al=SSL_AD_ILLEGAL_PARAMETER;
 970                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 971                         goto f_err;
 972                         }
 973                 ciphers=NULL;
 974                 c=ssl3_choose_cipher(s,s->session->ciphers,
 975                                      SSL_get_ciphers(s));
 976
 977                 if (c == NULL)
 978                         {
 979                         al=SSL_AD_HANDSHAKE_FAILURE;
 980                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 981                         goto f_err;
 982                         }
 983                 s->s3->tmp.new_cipher=c;
 984                 }
 985         else
 986                 {
 987                 /* Session-id reuse */
 988 #ifdef REUSE_CIPHER_BUG
 989                 STACK_OF(SSL_CIPHER) *sk;
 990                 SSL_CIPHER *nc=NULL;
 991                 SSL_CIPHER *ec=NULL;
 992
 993                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 994                         {
 995                         sk=s->session->ciphers;
 996                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
 997                                 {
 998                                 c=sk_SSL_CIPHER_value(sk,i);
 999                                 if (c->algorithms & SSL_eNULL)
1000                                         nc=c;
1001                                 if (SSL_C_IS_EXPORT(c))
1002                                         ec=c;
1003                                 }
1004                         if (nc != NULL)
1005                                 s->s3->tmp.new_cipher=nc;
1006                         else if (ec != NULL)
1007                                 s->s3->tmp.new_cipher=ec;
1008                         else
1009                                 s->s3->tmp.new_cipher=s->session->cipher;
1010                         }
1011                 else
1012 #endif
1013                 s->s3->tmp.new_cipher=s->session->cipher;
1014                 }
1015
1016         /* we now have the following setup.
1017          * client_random
1018          * cipher_list          - our prefered list of ciphers
1019          * ciphers              - the clients prefered list of ciphers
1020          * compression          - basically ignored right now
1021          * ssl version is set   - sslv3
1022          * s->session           - The ssl session has been setup.
1023          * s->hit               - session reuse flag
1024          * s->tmp.new_cipher    - the new cipher to use.
1025          */
1026
1027         ret=1;
1028         if (0)
1029                 {
1030 f_err:
1031                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1032                 }
1033 err:
1034         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1035         return(ret);
1036         }
1037
1038 int ssl3_send_server_hello(SSL *s)
1039         {
1040         unsigned char *buf;
1041         unsigned char *p,*d;
1042         int i,sl;
1043         unsigned long l,Time;
1044
1045         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1046                 {
1047                 buf=(unsigned char *)s->init_buf->data;
1048                 p=s->s3->server_random;
1049                 Time=time(NULL);                        /* Time */
1050                 l2n(Time,p);
1051                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1052                         return -1;
1053                 /* Do the message type and length last */
1054                 d=p= &(buf[4]);
1055
1056                 *(p++)=s->version>>8;
1057                 *(p++)=s->version&0xff;
1058
1059                 /* Random stuff */
1060                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1061                 p+=SSL3_RANDOM_SIZE;
1062
1063                 /* now in theory we have 3 options to sending back the
1064                  * session id.  If it is a re-use, we send back the
1065                  * old session-id, if it is a new session, we send
1066                  * back the new session-id or we send back a 0 length
1067                  * session-id if we want it to be single use.
1068                  * Currently I will not implement the '0' length session-id
1069                  * 12-Jan-98 - I'll now support the '0' length stuff.
1070                  */
1071                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
1072                         s->session->session_id_length=0;
1073
1074                 sl=s->session->session_id_length;
1075                 if (sl > (int)sizeof(s->session->session_id))
1076                         {
1077                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1078                         return -1;
1079                         }
1080                 *(p++)=sl;
1081                 memcpy(p,s->session->session_id,sl);
1082                 p+=sl;
1083
1084                 /* put the cipher */
1085                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1086                 p+=i;
1087
1088                 /* put the compression method */
1089                 if (s->s3->tmp.new_compression == NULL)
1090                         *(p++)=0;
1091                 else
1092                         *(p++)=s->s3->tmp.new_compression->id;
1093
1094                 /* do the header */
1095                 l=(p-d);
1096                 d=buf;
1097                 *(d++)=SSL3_MT_SERVER_HELLO;
1098                 l2n3(l,d);
1099
1100                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
1101                 /* number of bytes to write */
1102                 s->init_num=p-buf;
1103                 s->init_off=0;
1104                 }
1105
1106         /* SSL3_ST_CW_CLNT_HELLO_B */
1107         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1108         }
1109
1110 int ssl3_send_server_done(SSL *s)
1111         {
1112         unsigned char *p;
1113
1114         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1115                 {
1116                 p=(unsigned char *)s->init_buf->data;
1117
1118                 /* do the header */
1119                 *(p++)=SSL3_MT_SERVER_DONE;
1120                 *(p++)=0;
1121                 *(p++)=0;
1122                 *(p++)=0;
1123
1124                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1125                 /* number of bytes to write */
1126                 s->init_num=4;
1127                 s->init_off=0;
1128                 }
1129
1130         /* SSL3_ST_CW_CLNT_HELLO_B */
1131         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1132         }
1133
1134 int ssl3_send_server_key_exchange(SSL *s)
1135         {
1136 #ifndef OPENSSL_NO_RSA
1137         unsigned char *q;
1138         int j,num;
1139         RSA *rsa;
1140         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1141         unsigned int u;
1142 #endif
1143 #ifndef OPENSSL_NO_DH
1144         DH *dh=NULL,*dhp;
1145 #endif
1146 #ifndef OPENSSL_NO_ECDH
1147         EC_KEY *ecdh=NULL, *ecdhp;
1148         unsigned char *encodedPoint = NULL;
1149         int encodedlen = 0;
1150         int curve_id = 0;
1151         BN_CTX *bn_ctx = NULL;
1152 #endif
1153         EVP_PKEY *pkey;
1154         unsigned char *p,*d;
1155         int al,i;
1156         unsigned long type;
1157         int n;
1158         CERT *cert;
1159         BIGNUM *r[4];
1160         int nr[4],kn;
1161         BUF_MEM *buf;
1162         EVP_MD_CTX md_ctx;
1163
1164         EVP_MD_CTX_init(&md_ctx);
1165         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1166                 {
1167                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1168                 cert=s->cert;
1169
1170                 buf=s->init_buf;
1171
1172                 r[0]=r[1]=r[2]=r[3]=NULL;
1173                 n=0;
1174 #ifndef OPENSSL_NO_RSA
1175                 if (type & SSL_kRSA)
1176                         {
1177                         rsa=cert->rsa_tmp;
1178                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1179                                 {
1180                                 rsa=s->cert->rsa_tmp_cb(s,
1181                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1182                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1183                                 if(rsa == NULL)
1184                                 {
1185                                         al=SSL_AD_HANDSHAKE_FAILURE;
1186                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1187                                         goto f_err;
1188                                 }
1189                                 RSA_up_ref(rsa);
1190                                 cert->rsa_tmp=rsa;
1191                                 }
1192                         if (rsa == NULL)
1193                                 {
1194                                 al=SSL_AD_HANDSHAKE_FAILURE;
1195                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1196                                 goto f_err;
1197                                 }
1198                         r[0]=rsa->n;
1199                         r[1]=rsa->e;
1200                         s->s3->tmp.use_rsa_tmp=1;
1201                         }
1202                 else
1203 #endif
1204 #ifndef OPENSSL_NO_DH
1205                         if (type & SSL_kEDH)
1206                         {
1207                         dhp=cert->dh_tmp;
1208                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1209                                 dhp=s->cert->dh_tmp_cb(s,
1210                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1211                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1212                         if (dhp == NULL)
1213                                 {
1214                                 al=SSL_AD_HANDSHAKE_FAILURE;
1215                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1216                                 goto f_err;
1217                                 }
1218
1219                         if (s->s3->tmp.dh != NULL)
1220                                 {
1221                                 DH_free(dh);
1222                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1223                                 goto err;
1224                                 }
1225
1226                         if ((dh=DHparams_dup(dhp)) == NULL)
1227                                 {
1228                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1229                                 goto err;
1230                                 }
1231
1232                         s->s3->tmp.dh=dh;
1233                         if ((dhp->pub_key == NULL ||
1234                              dhp->priv_key == NULL ||
1235                              (s->options & SSL_OP_SINGLE_DH_USE)))
1236                                 {
1237                                 if(!DH_generate_key(dh))
1238                                     {
1239                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1240                                            ERR_R_DH_LIB);
1241                                     goto err;
1242                                     }
1243                                 }
1244                         else
1245                                 {
1246                                 dh->pub_key=BN_dup(dhp->pub_key);
1247                                 dh->priv_key=BN_dup(dhp->priv_key);
1248                                 if ((dh->pub_key == NULL) ||
1249                                         (dh->priv_key == NULL))
1250                                         {
1251                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1252                                         goto err;
1253                                         }
1254                                 }
1255                         r[0]=dh->p;
1256                         r[1]=dh->g;
1257                         r[2]=dh->pub_key;
1258                         }
1259                 else
1260 #endif
1261 #ifndef OPENSSL_NO_ECDH
1262                         if (type & SSL_kECDHE)
1263                         {
1264                         ecdhp=cert->ecdh_tmp;
1265                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1266                                 {
1267                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1268                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1269                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1270                                 }
1271                         if (ecdhp == NULL)
1272                                 {
1273                                 al=SSL_AD_HANDSHAKE_FAILURE;
1274                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1275                                 goto f_err;
1276                                 }
1277
1278                         if (s->s3->tmp.ecdh != NULL)
1279                                 {
1280                                 EC_KEY_free(s->s3->tmp.ecdh);
1281                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1282                                 goto err;
1283                                 }
1284
1285                         /* Duplicate the ECDH structure. */
1286                         if (ecdhp == NULL)
1287                                 {
1288                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1289                                 goto err;
1290                                 }
1291                         if (!EC_KEY_up_ref(ecdhp))
1292                                 {
1293                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1294                                 goto err;
1295                                 }
1296                         ecdh = ecdhp;
1297
1298                         s->s3->tmp.ecdh=ecdh;
1299                         if ((ecdh->pub_key == NULL) ||
1300                             (ecdh->priv_key == NULL) ||
1301                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1302                                 {
1303                                 if(!EC_KEY_generate_key(ecdh))
1304                                     {
1305                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1306                                     goto err;
1307                                     }
1308                                 }
1309
1310                         if ((ecdh->group == NULL) ||
1311                             (ecdh->pub_key == NULL) ||
1312                             (ecdh->priv_key == NULL))
1313                                 {
1314                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1315                                 goto err;
1316                                 }
1317
1318                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1319                             (EC_GROUP_get_degree(ecdh->group) > 163))
1320                                 {
1321                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1322                                 goto err;
1323                                 }
1324
1325                         /* XXX: For now, we only support ephemeral ECDH
1326                          * keys over named (not generic) curves. For
1327                          * supported named curves, curve_id is non-zero.
1328                          */
1329                         if ((curve_id =
1330                             nid2curve_id(EC_GROUP_get_nid(ecdh->group)))
1331                             == 0)
1332                                 {
1333                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1334                                 goto err;
1335                                 }
1336
1337                         /* Encode the public key.
1338                          * First check the size of encoding and
1339                          * allocate memory accordingly.
1340                          */
1341                         encodedlen = EC_POINT_point2oct(ecdh->group,
1342                             ecdh->pub_key,
1343                             POINT_CONVERSION_UNCOMPRESSED,
1344                             NULL, 0, NULL);
1345
1346                         encodedPoint = (unsigned char *)
1347                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1348                         bn_ctx = BN_CTX_new();
1349                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1350                                 {
1351                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1352                                 goto err;
1353                                 }
1354
1355
1356                         encodedlen = EC_POINT_point2oct(ecdh->group,
1357                             ecdh->pub_key,
1358                             POINT_CONVERSION_UNCOMPRESSED,
1359                             encodedPoint, encodedlen, bn_ctx);
1360
1361                         if (encodedlen == 0)
1362                                 {
1363                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1364                                 goto err;
1365                                 }
1366
1367                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1368
1369                         /* XXX: For now, we only support named (not
1370                          * generic) curves in ECDH ephemeral key exchanges.
1371                          * In this situation, we need three additional bytes
1372                          * to encode the entire ServerECDHParams
1373                          * structure.
1374                          */
1375                         n = 3 + encodedlen;
1376
1377                         /* We'll generate the serverKeyExchange message
1378                          * explicitly so we can set these to NULLs
1379                          */
1380                         r[0]=NULL;
1381                         r[1]=NULL;
1382                         r[2]=NULL;
1383                         }
1384                 else
1385 #endif /* !OPENSSL_NO_ECDH */
1386                         {
1387                         al=SSL_AD_HANDSHAKE_FAILURE;
1388                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1389                         goto f_err;
1390                         }
1391                 for (i=0; r[i] != NULL; i++)
1392                         {
1393                         nr[i]=BN_num_bytes(r[i]);
1394                         n+=2+nr[i];
1395                         }
1396
1397                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1398                         {
1399                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1400                                 == NULL)
1401                                 {
1402                                 al=SSL_AD_DECODE_ERROR;
1403                                 goto f_err;
1404                                 }
1405                         kn=EVP_PKEY_size(pkey);
1406                         }
1407                 else
1408                         {
1409                         pkey=NULL;
1410                         kn=0;
1411                         }
1412
1413                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1414                         {
1415                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1416                         goto err;
1417                         }
1418                 d=(unsigned char *)s->init_buf->data;
1419                 p= &(d[4]);
1420
1421                 for (i=0; r[i] != NULL; i++)
1422                         {
1423                         s2n(nr[i],p);
1424                         BN_bn2bin(r[i],p);
1425                         p+=nr[i];
1426                         }
1427
1428 #ifndef OPENSSL_NO_ECDH
1429                 if (type & SSL_kECDHE)
1430                         {
1431                         /* XXX: For now, we only support named (not generic) curves.
1432                          * In this situation, the serverKeyExchange message has:
1433                          * [1 byte CurveType], [1 byte CurveName]
1434                          * [1 byte length of encoded point], followed by
1435                          * the actual encoded point itself
1436                          */
1437                         *p = NAMED_CURVE_TYPE;
1438                         p += 1;
1439                         *p = curve_id;
1440                         p += 1;
1441                         *p = encodedlen;
1442                         p += 1;
1443                         memcpy((unsigned char*)p,
1444                             (unsigned char *)encodedPoint,
1445                             encodedlen);
1446                         OPENSSL_free(encodedPoint);
1447                         p += encodedlen;
1448                         }
1449 #endif
1450
1451                 /* not anonymous */
1452                 if (pkey != NULL)
1453                         {
1454                         /* n is the length of the params, they start at &(d[4])
1455                          * and p points to the space at the end. */
1456 #ifndef OPENSSL_NO_RSA
1457                         if (pkey->type == EVP_PKEY_RSA)
1458                                 {
1459                                 q=md_buf;
1460                                 j=0;
1461                                 for (num=2; num > 0; num--)
1462                                         {
1463                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1464                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1465                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1466                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1467                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1468                                         EVP_DigestFinal_ex(&md_ctx,q,
1469                                                 (unsigned int *)&i);
1470                                         q+=i;
1471                                         j+=i;
1472                                         }
1473                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1474                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1475                                         {
1476                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1477                                         goto err;
1478                                         }
1479                                 s2n(u,p);
1480                                 n+=u+2;
1481                                 }
1482                         else
1483 #endif
1484 #if !defined(OPENSSL_NO_DSA)
1485                                 if (pkey->type == EVP_PKEY_DSA)
1486                                 {
1487                                 /* lets do DSS */
1488                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1489                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1490                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1491                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1492                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1493                                         (unsigned int *)&i,pkey))
1494                                         {
1495                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1496                                         goto err;
1497                                         }
1498                                 s2n(i,p);
1499                                 n+=i+2;
1500                                 }
1501                         else
1502 #endif
1503 #if !defined(OPENSSL_NO_ECDSA)
1504                                 if (pkey->type == EVP_PKEY_EC)
1505                                 {
1506                                 /* let's do ECDSA */
1507                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1508                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1509                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1510                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1511                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1512                                         (unsigned int *)&i,pkey))
1513                                         {
1514                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1515                                         goto err;
1516                                         }
1517                                 s2n(i,p);
1518                                 n+=i+2;
1519                                 }
1520                         else
1521 #endif
1522                                 {
1523                                 /* Is this error check actually needed? */
1524                                 al=SSL_AD_HANDSHAKE_FAILURE;
1525                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1526                                 goto f_err;
1527                                 }
1528                         }
1529
1530                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1531                 l2n3(n,d);
1532
1533                 /* we should now have things packed up, so lets send
1534                  * it off */
1535                 s->init_num=n+4;
1536                 s->init_off=0;
1537                 }
1538
1539         s->state = SSL3_ST_SW_KEY_EXCH_B;
1540         EVP_MD_CTX_cleanup(&md_ctx);
1541         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1542 f_err:
1543         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1544 err:
1545 #ifndef OPENSSL_NO_ECDH
1546         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1547         BN_CTX_free(bn_ctx);
1548 #endif
1549         EVP_MD_CTX_cleanup(&md_ctx);
1550         return(-1);
1551         }
1552
1553 int ssl3_send_certificate_request(SSL *s)
1554         {
1555         unsigned char *p,*d;
1556         int i,j,nl,off,n;
1557         STACK_OF(X509_NAME) *sk=NULL;
1558         X509_NAME *name;
1559         BUF_MEM *buf;
1560
1561         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1562                 {
1563                 buf=s->init_buf;
1564
1565                 d=p=(unsigned char *)&(buf->data[4]);
1566
1567                 /* get the list of acceptable cert types */
1568                 p++;
1569                 n=ssl3_get_req_cert_type(s,p);
1570                 d[0]=n;
1571                 p+=n;
1572                 n++;
1573
1574                 off=n;
1575                 p+=2;
1576                 n+=2;
1577
1578                 sk=SSL_get_client_CA_list(s);
1579                 nl=0;
1580                 if (sk != NULL)
1581                         {
1582                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1583                                 {
1584                                 name=sk_X509_NAME_value(sk,i);
1585                                 j=i2d_X509_NAME(name,NULL);
1586                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1587                                         {
1588                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1589                                         goto err;
1590                                         }
1591                                 p=(unsigned char *)&(buf->data[4+n]);
1592                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1593                                         {
1594                                         s2n(j,p);
1595                                         i2d_X509_NAME(name,&p);
1596                                         n+=2+j;
1597                                         nl+=2+j;
1598                                         }
1599                                 else
1600                                         {
1601                                         d=p;
1602                                         i2d_X509_NAME(name,&p);
1603                                         j-=2; s2n(j,d); j+=2;
1604                                         n+=j;
1605                                         nl+=j;
1606                                         }
1607                                 }
1608                         }
1609                 /* else no CA names */
1610                 p=(unsigned char *)&(buf->data[4+off]);
1611                 s2n(nl,p);
1612
1613                 d=(unsigned char *)buf->data;
1614                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1615                 l2n3(n,d);
1616
1617                 /* we should now have things packed up, so lets send
1618                  * it off */
1619
1620                 s->init_num=n+4;
1621                 s->init_off=0;
1622 #ifdef NETSCAPE_HANG_BUG
1623                 p=(unsigned char *)s->init_buf->data + s->init_num;
1624
1625                 /* do the header */
1626                 *(p++)=SSL3_MT_SERVER_DONE;
1627                 *(p++)=0;
1628                 *(p++)=0;
1629                 *(p++)=0;
1630                 s->init_num += 4;
1631 #endif
1632
1633                 s->state = SSL3_ST_SW_CERT_REQ_B;
1634                 }
1635
1636         /* SSL3_ST_SW_CERT_REQ_B */
1637         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1638 err:
1639         return(-1);
1640         }
1641
1642
1643 static const int KDF1_SHA1_len = 20;
1644 static void *KDF1_SHA1(const void *in, size_t inlen, void *out, size_t *outlen)
1645         {
1646 #ifndef OPENSSL_NO_SHA
1647         if (*outlen < SHA_DIGEST_LENGTH)
1648                 return NULL;
1649         else
1650                 *outlen = SHA_DIGEST_LENGTH;
1651         return SHA1(in, inlen, out);
1652 #else
1653         return NULL;
1654 #endif
1655         }
1656
1657 int ssl3_get_client_key_exchange(SSL *s)
1658         {
1659         int i,al,ok;
1660         long n;
1661         unsigned long l;
1662         unsigned char *p;
1663 #ifndef OPENSSL_NO_RSA
1664         RSA *rsa=NULL;
1665         EVP_PKEY *pkey=NULL;
1666 #endif
1667 #ifndef OPENSSL_NO_DH
1668         BIGNUM *pub=NULL;
1669         DH *dh_srvr;
1670 #endif
1671 #ifndef OPENSSL_NO_KRB5
1672         KSSL_ERR kssl_err;
1673 #endif /* OPENSSL_NO_KRB5 */
1674
1675 #ifndef OPENSSL_NO_ECDH
1676         EC_KEY *srvr_ecdh = NULL;
1677         EVP_PKEY *clnt_pub_pkey = NULL;
1678         EC_POINT *clnt_ecpoint = NULL;
1679         BN_CTX *bn_ctx = NULL;
1680 #endif
1681
1682         n=s->method->ssl_get_message(s,
1683                 SSL3_ST_SR_KEY_EXCH_A,
1684                 SSL3_ST_SR_KEY_EXCH_B,
1685                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1686                 2048, /* ??? */
1687                 &ok);
1688
1689         if (!ok) return((int)n);
1690         p=(unsigned char *)s->init_msg;
1691
1692         l=s->s3->tmp.new_cipher->algorithms;
1693
1694 #ifndef OPENSSL_NO_RSA
1695         if (l & SSL_kRSA)
1696                 {
1697                 /* FIX THIS UP EAY EAY EAY EAY */
1698                 if (s->s3->tmp.use_rsa_tmp)
1699                         {
1700                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1701                                 rsa=s->cert->rsa_tmp;
1702                         /* Don't do a callback because rsa_tmp should
1703                          * be sent already */
1704                         if (rsa == NULL)
1705                                 {
1706                                 al=SSL_AD_HANDSHAKE_FAILURE;
1707                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1708                                 goto f_err;
1709
1710                                 }
1711                         }
1712                 else
1713                         {
1714                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1715                         if (    (pkey == NULL) ||
1716                                 (pkey->type != EVP_PKEY_RSA) ||
1717                                 (pkey->pkey.rsa == NULL))
1718                                 {
1719                                 al=SSL_AD_HANDSHAKE_FAILURE;
1720                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1721                                 goto f_err;
1722                                 }
1723                         rsa=pkey->pkey.rsa;
1724                         }
1725
1726                 /* TLS */
1727                 if (s->version > SSL3_VERSION)
1728                         {
1729                         n2s(p,i);
1730                         if (n != i+2)
1731                                 {
1732                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1733                                         {
1734                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1735                                         goto err;
1736                                         }
1737                                 else
1738                                         p-=2;
1739                                 }
1740                         else
1741                                 n=i;
1742                         }
1743
1744                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1745
1746                 al = -1;
1747
1748                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1749                         {
1750                         al=SSL_AD_DECODE_ERROR;
1751                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
1752                         }
1753
1754                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1755                         {
1756                         /* The premaster secret must contain the same version number as the
1757                          * ClientHello to detect version rollback attacks (strangely, the
1758                          * protocol does not offer such protection for DH ciphersuites).
1759                          * However, buggy clients exist that send the negotiated protocol
1760                          * version instead if the server does not support the requested
1761                          * protocol version.
1762                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1763                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1764                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1765                                 {
1766                                 al=SSL_AD_DECODE_ERROR;
1767                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1768
1769                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1770                                  * (http://eprint.iacr.org/2003/052/) exploits the version
1771                                  * number check as a "bad version oracle" -- an alert would
1772                                  * reveal that the plaintext corresponding to some ciphertext
1773                                  * made up by the adversary is properly formatted except
1774                                  * that the version number is wrong.  To avoid such attacks,
1775                                  * we should treat this just like any other decryption error. */
1776                                 }
1777                         }
1778
1779                 if (al != -1)
1780                         {
1781                         /* Some decryption failure -- use random value instead as countermeasure
1782                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1783                          * (see RFC 2246, section 7.4.7.1). */
1784                         ERR_clear_error();
1785                         i = SSL_MAX_MASTER_KEY_LENGTH;
1786                         p[0] = s->client_version >> 8;
1787                         p[1] = s->client_version & 0xff;
1788                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
1789                                 goto err;
1790                         }
1791
1792                 s->session->master_key_length=
1793                         s->method->ssl3_enc->generate_master_secret(s,
1794                                 s->session->master_key,
1795                                 p,i);
1796                 OPENSSL_cleanse(p,i);
1797                 }
1798         else
1799 #endif
1800 #ifndef OPENSSL_NO_DH
1801                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1802                 {
1803                 n2s(p,i);
1804                 if (n != i+2)
1805                         {
1806                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1807                                 {
1808                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1809                                 goto err;
1810                                 }
1811                         else
1812                                 {
1813                                 p-=2;
1814                                 i=(int)n;
1815                                 }
1816                         }
1817
1818                 if (n == 0L) /* the parameters are in the cert */
1819                         {
1820                         al=SSL_AD_HANDSHAKE_FAILURE;
1821                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1822                         goto f_err;
1823                         }
1824                 else
1825                         {
1826                         if (s->s3->tmp.dh == NULL)
1827                                 {
1828                                 al=SSL_AD_HANDSHAKE_FAILURE;
1829                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1830                                 goto f_err;
1831                                 }
1832                         else
1833                                 dh_srvr=s->s3->tmp.dh;
1834                         }
1835
1836                 pub=BN_bin2bn(p,i,NULL);
1837                 if (pub == NULL)
1838                         {
1839                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1840                         goto err;
1841                         }
1842
1843                 i=DH_compute_key(p,pub,dh_srvr);
1844
1845                 if (i <= 0)
1846                         {
1847                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1848                         goto err;
1849                         }
1850
1851                 DH_free(s->s3->tmp.dh);
1852                 s->s3->tmp.dh=NULL;
1853
1854                 BN_clear_free(pub);
1855                 pub=NULL;
1856                 s->session->master_key_length=
1857                         s->method->ssl3_enc->generate_master_secret(s,
1858                                 s->session->master_key,p,i);
1859                 OPENSSL_cleanse(p,i);
1860                 }
1861         else
1862 #endif
1863 #ifndef OPENSSL_NO_KRB5
1864         if (l & SSL_kKRB5)
1865                 {
1866                 krb5_error_code         krb5rc;
1867                 krb5_data               enc_ticket;
1868                 krb5_data               authenticator;
1869                 krb5_data               enc_pms;
1870                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
1871                 EVP_CIPHER_CTX          ciph_ctx;
1872                 EVP_CIPHER              *enc = NULL;
1873                 unsigned char           iv[EVP_MAX_IV_LENGTH];
1874                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
1875                                                + EVP_MAX_BLOCK_LENGTH];
1876                 int                     padl, outl;
1877                 krb5_timestamp          authtime = 0;
1878                 krb5_ticket_times       ttimes;
1879
1880                 EVP_CIPHER_CTX_init(&ciph_ctx);
1881
1882                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
1883
1884                 n2s(p,i);
1885                 enc_ticket.length = i;
1886                 enc_ticket.data = (char *)p;
1887                 p+=enc_ticket.length;
1888
1889                 n2s(p,i);
1890                 authenticator.length = i;
1891                 authenticator.data = (char *)p;
1892                 p+=authenticator.length;
1893
1894                 n2s(p,i);
1895                 enc_pms.length = i;
1896                 enc_pms.data = (char *)p;
1897                 p+=enc_pms.length;
1898
1899                 /* Note that the length is checked again below,
1900                 ** after decryption
1901                 */
1902                 if(enc_pms.length > sizeof pms)
1903                         {
1904                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1905                                SSL_R_DATA_LENGTH_TOO_LONG);
1906                         goto err;
1907                         }
1908
1909                 if (n != (long)(enc_ticket.length + authenticator.length +
1910                                                 enc_pms.length + 6))
1911                         {
1912                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1913                                 SSL_R_DATA_LENGTH_TOO_LONG);
1914                         goto err;
1915                         }
1916
1917                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
1918                                         &kssl_err)) != 0)
1919                         {
1920 #ifdef KSSL_DEBUG
1921                         printf("kssl_sget_tkt rtn %d [%d]\n",
1922                                 krb5rc, kssl_err.reason);
1923                         if (kssl_err.text)
1924                                 printf("kssl_err text= %s\n", kssl_err.text);
1925 #endif  /* KSSL_DEBUG */
1926                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1927                                 kssl_err.reason);
1928                         goto err;
1929                         }
1930
1931                 /*  Note: no authenticator is not considered an error,
1932                 **  but will return authtime == 0.
1933                 */
1934                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
1935                                         &authtime, &kssl_err)) != 0)
1936                         {
1937 #ifdef KSSL_DEBUG
1938                         printf("kssl_check_authent rtn %d [%d]\n",
1939                                 krb5rc, kssl_err.reason);
1940                         if (kssl_err.text)
1941                                 printf("kssl_err text= %s\n", kssl_err.text);
1942 #endif  /* KSSL_DEBUG */
1943                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1944                                 kssl_err.reason);
1945                         goto err;
1946                         }
1947
1948                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
1949                         {
1950                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
1951                         goto err;
1952                         }
1953
1954 #ifdef KSSL_DEBUG
1955                 kssl_ctx_show(kssl_ctx);
1956 #endif  /* KSSL_DEBUG */
1957
1958                 enc = kssl_map_enc(kssl_ctx->enctype);
1959                 if (enc == NULL)
1960                     goto err;
1961
1962                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
1963
1964                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
1965                         {
1966                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1967                                 SSL_R_DECRYPTION_FAILED);
1968                         goto err;
1969                         }
1970                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
1971                                         (unsigned char *)enc_pms.data, enc_pms.length))
1972                         {
1973                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1974                                 SSL_R_DECRYPTION_FAILED);
1975                         goto err;
1976                         }
1977                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1978                         {
1979                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1980                                 SSL_R_DATA_LENGTH_TOO_LONG);
1981                         goto err;
1982                         }
1983                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
1984                         {
1985                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1986                                 SSL_R_DECRYPTION_FAILED);
1987                         goto err;
1988                         }
1989                 outl += padl;
1990                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1991                         {
1992                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1993                                 SSL_R_DATA_LENGTH_TOO_LONG);
1994                         goto err;
1995                         }
1996                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1997
1998                 s->session->master_key_length=
1999                         s->method->ssl3_enc->generate_master_secret(s,
2000                                 s->session->master_key, pms, outl);
2001
2002                 if (kssl_ctx->client_princ)
2003                         {
2004                         int len = strlen(kssl_ctx->client_princ);
2005                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2006                                 {
2007                                 s->session->krb5_client_princ_len = len;
2008                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2009                                 }
2010                         }
2011
2012
2013                 /*  Was doing kssl_ctx_free() here,
2014                 **  but it caused problems for apache.
2015                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2016                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2017                 */
2018                 }
2019         else
2020 #endif  /* OPENSSL_NO_KRB5 */
2021
2022 #ifndef OPENSSL_NO_ECDH
2023                 if ((l & SSL_kECDH) || (l & SSL_kECDHE))
2024                 {
2025                 int ret = 1;
2026                 int field_size = 0;
2027
2028                 /* initialize structures for server's ECDH key pair */
2029                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2030                         {
2031                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2032                             ERR_R_MALLOC_FAILURE);
2033                         goto err;
2034                         }
2035
2036                 /* Let's get server private key and group information */
2037                 if (l & SSL_kECDH)
2038                         {
2039                         /* use the certificate */
2040                         srvr_ecdh->group = s->cert->key->privatekey-> \
2041                             pkey.eckey->group;
2042                         srvr_ecdh->priv_key = s->cert->key->privatekey-> \
2043                             pkey.eckey->priv_key;
2044                         }
2045                 else
2046                         {
2047                         /* use the ephermeral values we saved when
2048                          * generating the ServerKeyExchange msg.
2049                          */
2050                         srvr_ecdh->group = s->s3->tmp.ecdh->group;
2051                         srvr_ecdh->priv_key = s->s3->tmp.ecdh->priv_key;
2052                         }
2053
2054                 /* Let's get client's public key */
2055                 if ((clnt_ecpoint = EC_POINT_new(srvr_ecdh->group))
2056                     == NULL)
2057                         {
2058                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2059                             ERR_R_MALLOC_FAILURE);
2060                         goto err;
2061                         }
2062
2063                 if (n == 0L)
2064                         {
2065                         /* Client Publickey was in Client Certificate */
2066
2067                          if (l & SSL_kECDHE)
2068                                  {
2069                                  al=SSL_AD_HANDSHAKE_FAILURE;
2070                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2071                                  goto f_err;
2072                                  }
2073                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2074                             == NULL) ||
2075                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2076                                 {
2077                                 /* XXX: For now, we do not support client
2078                                  * authentication using ECDH certificates
2079                                  * so this branch (n == 0L) of the code is
2080                                  * never executed. When that support is
2081                                  * added, we ought to ensure the key
2082                                  * received in the certificate is
2083                                  * authorized for key agreement.
2084                                  * ECDH_compute_key implicitly checks that
2085                                  * the two ECDH shares are for the same
2086                                  * group.
2087                                  */
2088                                 al=SSL_AD_HANDSHAKE_FAILURE;
2089                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2090                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2091                                 goto f_err;
2092                                 }
2093
2094                         EC_POINT_copy(clnt_ecpoint,
2095                             clnt_pub_pkey->pkey.eckey->pub_key);
2096                         ret = 2; /* Skip certificate verify processing */
2097                         }
2098                 else
2099                         {
2100                         /* Get client's public key from encoded point
2101                          * in the ClientKeyExchange message.
2102                          */
2103                         if ((bn_ctx = BN_CTX_new()) == NULL)
2104                                 {
2105                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2106                                     ERR_R_MALLOC_FAILURE);
2107                                 goto err;
2108                                 }
2109
2110                         /* Get encoded point length */
2111                         i = *p;
2112                         p += 1;
2113                         if (EC_POINT_oct2point(srvr_ecdh->group,
2114                             clnt_ecpoint, p, i, bn_ctx) == 0)
2115                                 {
2116                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2117                                     ERR_R_EC_LIB);
2118                                 goto err;
2119                                 }
2120                         /* p is pointing to somewhere in the buffer
2121                          * currently, so set it to the start
2122                          */
2123                         p=(unsigned char *)s->init_buf->data;
2124                         }
2125
2126                 /* Compute the shared pre-master secret */
2127                 field_size = EC_GROUP_get_degree(srvr_ecdh->group);
2128                 if (field_size <= 0)
2129                         {
2130                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2131                                ERR_R_ECDH_LIB);
2132                         goto err;
2133                         }
2134                 /* If field size is not more than 24 octets, then use SHA-1 hash of result;
2135                  * otherwise, use result (see section 4.8 of draft-ietf-tls-ecc-03.txt;
2136                  * this is new with this version of the Internet Draft).
2137                  */
2138                 if (field_size <= 24 * 8)
2139                     i = ECDH_compute_key(p, KDF1_SHA1_len, clnt_ecpoint, srvr_ecdh, KDF1_SHA1);
2140                 else
2141                     i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2142                 if (i <= 0)
2143                         {
2144                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2145                             ERR_R_ECDH_LIB);
2146                         goto err;
2147                         }
2148
2149                 EVP_PKEY_free(clnt_pub_pkey);
2150                 EC_POINT_free(clnt_ecpoint);
2151                 if (srvr_ecdh != NULL)
2152                         {
2153                         srvr_ecdh->priv_key = NULL;
2154                         srvr_ecdh->group = NULL;
2155                         EC_KEY_free(srvr_ecdh);
2156                         }
2157                 BN_CTX_free(bn_ctx);
2158
2159                 /* Compute the master secret */
2160                 s->session->master_key_length = s->method->ssl3_enc-> \
2161                     generate_master_secret(s, s->session->master_key, p, i);
2162
2163                 OPENSSL_cleanse(p, i);
2164                 return (ret);
2165                 }
2166         else
2167 #endif
2168                 {
2169                 al=SSL_AD_HANDSHAKE_FAILURE;
2170                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2171                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2172                 goto f_err;
2173                 }
2174
2175         return(1);
2176 f_err:
2177         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2178 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2179 err:
2180 #endif
2181 #ifndef OPENSSL_NO_ECDH
2182         EVP_PKEY_free(clnt_pub_pkey);
2183         EC_POINT_free(clnt_ecpoint);
2184         if (srvr_ecdh != NULL)
2185                 {
2186                 srvr_ecdh->priv_key = NULL;
2187                 srvr_ecdh->group = NULL;
2188                 EC_KEY_free(srvr_ecdh);
2189                 }
2190         BN_CTX_free(bn_ctx);
2191 #endif
2192         return(-1);
2193         }
2194
2195 int ssl3_get_cert_verify(SSL *s)
2196         {
2197         EVP_PKEY *pkey=NULL;
2198         unsigned char *p;
2199         int al,ok,ret=0;
2200         long n;
2201         int type=0,i,j;
2202         X509 *peer;
2203
2204         n=s->method->ssl_get_message(s,
2205                 SSL3_ST_SR_CERT_VRFY_A,
2206                 SSL3_ST_SR_CERT_VRFY_B,
2207                 -1,
2208                 514, /* 514? */
2209                 &ok);
2210
2211         if (!ok) return((int)n);
2212
2213         if (s->session->peer != NULL)
2214                 {
2215                 peer=s->session->peer;
2216                 pkey=X509_get_pubkey(peer);
2217                 type=X509_certificate_type(peer,pkey);
2218                 }
2219         else
2220                 {
2221                 peer=NULL;
2222                 pkey=NULL;
2223                 }
2224
2225         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2226                 {
2227                 s->s3->tmp.reuse_message=1;
2228                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2229                         {
2230                         al=SSL_AD_UNEXPECTED_MESSAGE;
2231                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2232                         goto f_err;
2233                         }
2234                 ret=1;
2235                 goto end;
2236                 }
2237
2238         if (peer == NULL)
2239                 {
2240                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2241                 al=SSL_AD_UNEXPECTED_MESSAGE;
2242                 goto f_err;
2243                 }
2244
2245         if (!(type & EVP_PKT_SIGN))
2246                 {
2247                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2248                 al=SSL_AD_ILLEGAL_PARAMETER;
2249                 goto f_err;
2250                 }
2251
2252         if (s->s3->change_cipher_spec)
2253                 {
2254                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2255                 al=SSL_AD_UNEXPECTED_MESSAGE;
2256                 goto f_err;
2257                 }
2258
2259         /* we now have a signature that we need to verify */
2260         p=(unsigned char *)s->init_msg;
2261         n2s(p,i);
2262         n-=2;
2263         if (i > n)
2264                 {
2265                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2266                 al=SSL_AD_DECODE_ERROR;
2267                 goto f_err;
2268                 }
2269
2270         j=EVP_PKEY_size(pkey);
2271         if ((i > j) || (n > j) || (n <= 0))
2272                 {
2273                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2274                 al=SSL_AD_DECODE_ERROR;
2275                 goto f_err;
2276                 }
2277
2278 #ifndef OPENSSL_NO_RSA
2279         if (pkey->type == EVP_PKEY_RSA)
2280                 {
2281                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2282                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
2283                                                         pkey->pkey.rsa);
2284                 if (i < 0)
2285                         {
2286                         al=SSL_AD_DECRYPT_ERROR;
2287                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2288                         goto f_err;
2289                         }
2290                 if (i == 0)
2291                         {
2292                         al=SSL_AD_DECRYPT_ERROR;
2293                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2294                         goto f_err;
2295                         }
2296                 }
2297         else
2298 #endif
2299 #ifndef OPENSSL_NO_DSA
2300                 if (pkey->type == EVP_PKEY_DSA)
2301                 {
2302                 j=DSA_verify(pkey->save_type,
2303                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2304                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2305                 if (j <= 0)
2306                         {
2307                         /* bad signature */
2308                         al=SSL_AD_DECRYPT_ERROR;
2309                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2310                         goto f_err;
2311                         }
2312                 }
2313         else
2314 #endif
2315 #ifndef OPENSSL_NO_ECDSA
2316                 if (pkey->type == EVP_PKEY_EC)
2317                 {
2318                 j=ECDSA_verify(pkey->save_type,
2319                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2320                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.eckey);
2321                 if (j <= 0)
2322                         {
2323                         /* bad signature */
2324                         al=SSL_AD_DECRYPT_ERROR;
2325                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2326                             SSL_R_BAD_ECDSA_SIGNATURE);
2327                         goto f_err;
2328                         }
2329                 }
2330         else
2331 #endif
2332                 {
2333                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2334                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2335                 goto f_err;
2336                 }
2337
2338
2339         ret=1;
2340         if (0)
2341                 {
2342 f_err:
2343                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2344                 }
2345 end:
2346         EVP_PKEY_free(pkey);
2347         return(ret);
2348         }
2349
2350 int ssl3_get_client_certificate(SSL *s)
2351         {
2352         int i,ok,al,ret= -1;
2353         X509 *x=NULL;
2354         unsigned long l,nc,llen,n;
2355         const unsigned char *p,*q;
2356         unsigned char *d;
2357         STACK_OF(X509) *sk=NULL;
2358
2359         n=s->method->ssl_get_message(s,
2360                 SSL3_ST_SR_CERT_A,
2361                 SSL3_ST_SR_CERT_B,
2362                 -1,
2363                 s->max_cert_list,
2364                 &ok);
2365
2366         if (!ok) return((int)n);
2367
2368         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2369                 {
2370                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2371                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2372                         {
2373                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2374                         al=SSL_AD_HANDSHAKE_FAILURE;
2375                         goto f_err;
2376                         }
2377                 /* If tls asked for a client cert, the client must return a 0 list */
2378                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2379                         {
2380                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2381                         al=SSL_AD_UNEXPECTED_MESSAGE;
2382                         goto f_err;
2383                         }
2384                 s->s3->tmp.reuse_message=1;
2385                 return(1);
2386                 }
2387
2388         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2389                 {
2390                 al=SSL_AD_UNEXPECTED_MESSAGE;
2391                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2392                 goto f_err;
2393                 }
2394         p=d=(unsigned char *)s->init_msg;
2395
2396         if ((sk=sk_X509_new_null()) == NULL)
2397                 {
2398                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2399                 goto err;
2400                 }
2401
2402         n2l3(p,llen);
2403         if (llen+3 != n)
2404                 {
2405                 al=SSL_AD_DECODE_ERROR;
2406                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2407                 goto f_err;
2408                 }
2409         for (nc=0; nc<llen; )
2410                 {
2411                 n2l3(p,l);
2412                 if ((l+nc+3) > llen)
2413                         {
2414                         al=SSL_AD_DECODE_ERROR;
2415                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2416                         goto f_err;
2417                         }
2418
2419                 q=p;
2420                 x=d2i_X509(NULL,&p,l);
2421                 if (x == NULL)
2422                         {
2423                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2424                         goto err;
2425                         }
2426                 if (p != (q+l))
2427                         {
2428                         al=SSL_AD_DECODE_ERROR;
2429                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2430                         goto f_err;
2431                         }
2432                 if (!sk_X509_push(sk,x))
2433                         {
2434                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2435                         goto err;
2436                         }
2437                 x=NULL;
2438                 nc+=l+3;
2439                 }
2440
2441         if (sk_X509_num(sk) <= 0)
2442                 {
2443                 /* TLS does not mind 0 certs returned */
2444                 if (s->version == SSL3_VERSION)
2445                         {
2446                         al=SSL_AD_HANDSHAKE_FAILURE;
2447                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2448                         goto f_err;
2449                         }
2450                 /* Fail for TLS only if we required a certificate */
2451                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2452                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2453                         {
2454                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2455                         al=SSL_AD_HANDSHAKE_FAILURE;
2456                         goto f_err;
2457                         }
2458                 }
2459         else
2460                 {
2461                 i=ssl_verify_cert_chain(s,sk);
2462                 if (!i)
2463                         {
2464                         al=ssl_verify_alarm_type(s->verify_result);
2465                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2466                         goto f_err;
2467                         }
2468                 }
2469
2470         if (s->session->peer != NULL) /* This should not be needed */
2471                 X509_free(s->session->peer);
2472         s->session->peer=sk_X509_shift(sk);
2473         s->session->verify_result = s->verify_result;
2474
2475         /* With the current implementation, sess_cert will always be NULL
2476          * when we arrive here. */
2477         if (s->session->sess_cert == NULL)
2478                 {
2479                 s->session->sess_cert = ssl_sess_cert_new();
2480                 if (s->session->sess_cert == NULL)
2481                         {
2482                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2483                         goto err;
2484                         }
2485                 }
2486         if (s->session->sess_cert->cert_chain != NULL)
2487                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2488         s->session->sess_cert->cert_chain=sk;
2489         /* Inconsistency alert: cert_chain does *not* include the
2490          * peer's own certificate, while we do include it in s3_clnt.c */
2491
2492         sk=NULL;
2493
2494         ret=1;
2495         if (0)
2496                 {
2497 f_err:
2498                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2499                 }
2500 err:
2501         if (x != NULL) X509_free(x);
2502         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2503         return(ret);
2504         }
2505
2506 int ssl3_send_server_certificate(SSL *s)
2507         {
2508         unsigned long l;
2509         X509 *x;
2510
2511         if (s->state == SSL3_ST_SW_CERT_A)
2512                 {
2513                 x=ssl_get_server_send_cert(s);
2514                 if (x == NULL &&
2515                         /* VRS: allow null cert if auth == KRB5 */
2516                         (s->s3->tmp.new_cipher->algorithms
2517                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
2518                         != (SSL_aKRB5|SSL_kKRB5))
2519                         {
2520                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2521                         return(0);
2522                         }
2523
2524                 l=ssl3_output_cert_chain(s,x);
2525                 s->state=SSL3_ST_SW_CERT_B;
2526                 s->init_num=(int)l;
2527                 s->init_off=0;
2528                 }
2529
2530         /* SSL3_ST_SW_CERT_B */
2531         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2532         }
2533
2534
2535 #ifndef OPENSSL_NO_ECDH
2536 /* This is the complement of curve_id2nid in s3_clnt.c. */
2537 static int nid2curve_id(int nid)
2538 {
2539         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2540          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2541         switch (nid) {
2542         case NID_sect163k1: /* sect163k1 (1) */
2543                 return 1;
2544         case NID_sect163r1: /* sect163r1 (2) */
2545                 return 2;
2546         case NID_sect163r2: /* sect163r2 (3) */
2547                 return 3;
2548         case NID_sect193r1: /* sect193r1 (4) */
2549                 return 4;
2550         case NID_sect193r2: /* sect193r2 (5) */
2551                 return 5;
2552         case NID_sect233k1: /* sect233k1 (6) */
2553                 return 6;
2554         case NID_sect233r1: /* sect233r1 (7) */
2555                 return 7;
2556         case NID_sect239k1: /* sect239k1 (8) */
2557                 return 8;
2558         case NID_sect283k1: /* sect283k1 (9) */
2559                 return 9;
2560         case NID_sect283r1: /* sect283r1 (10) */
2561                 return 10;
2562         case NID_sect409k1: /* sect409k1 (11) */
2563                 return 11;
2564         case NID_sect409r1: /* sect409r1 (12) */
2565                 return 12;
2566         case NID_sect571k1: /* sect571k1 (13) */
2567                 return 13;
2568         case NID_sect571r1: /* sect571r1 (14) */
2569                 return 14;
2570         case NID_secp160k1: /* secp160k1 (15) */
2571                 return 15;
2572         case NID_secp160r1: /* secp160r1 (16) */
2573                 return 16;
2574         case NID_secp160r2: /* secp160r2 (17) */
2575                 return 17;
2576         case NID_secp192k1: /* secp192k1 (18) */
2577                 return 18;
2578         case NID_X9_62_prime192v1: /* secp192r1 (19) */
2579                 return 19;
2580         case NID_secp224k1: /* secp224k1 (20) */
2581                 return 20;
2582         case NID_secp224r1: /* secp224r1 (21) */
2583                 return 21;
2584         case NID_secp256k1: /* secp256k1 (22) */
2585                 return 22;
2586         case NID_X9_62_prime256v1: /* secp256r1 (23) */
2587                 return 23;
2588         case NID_secp384r1: /* secp384r1 (24) */
2589                 return 24;
2590         case NID_secp521r1:  /* secp521r1 (25) */
2591                 return 25;
2592         default:
2593                 return 0;
2594         }
2595 }
2596 #endif