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) 1998-2003 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124
 125 #define REUSE_CIPHER_BUG
 126 #define NETSCAPE_HANG_BUG
 127
 128 #include <stdio.h>
 129 #include "ssl_locl.h"
 130 #include "kssl_lcl.h"
 131 #include <openssl/buffer.h>
 132 #include <openssl/rand.h>
 133 #include <openssl/objects.h>
 134 #include <openssl/evp.h>
 135 #include <openssl/x509.h>
 136 #ifndef OPENSSL_NO_KRB5
 137 #include <openssl/krb5_asn.h>
 138 #endif
 139 #include <openssl/md5.h>
 140
 141 static SSL_METHOD *ssl3_get_server_method(int ver);
 142 static int ssl3_get_client_hello(SSL *s);
 143 static int ssl3_check_client_hello(SSL *s);
 144 static int ssl3_send_server_hello(SSL *s);
 145 static int ssl3_send_server_key_exchange(SSL *s);
 146 static int ssl3_send_certificate_request(SSL *s);
 147 static int ssl3_send_server_done(SSL *s);
 148 static int ssl3_get_client_key_exchange(SSL *s);
 149 static int ssl3_get_client_certificate(SSL *s);
 150 static int ssl3_get_cert_verify(SSL *s);
 151 static int ssl3_send_hello_request(SSL *s);
 152
 153 #ifndef OPENSSL_NO_ECDH
 154 static int nid2curve_id(int nid);
 155 #endif
 156
 157 static SSL_METHOD *ssl3_get_server_method(int ver)
 158         {
 159         if (ver == SSL3_VERSION)
 160                 return(SSLv3_server_method());
 161         else
 162                 return(NULL);
 163         }
 164
 165 SSL_METHOD *SSLv3_server_method(void)
 166         {
 167         static int init=1;
 168         static SSL_METHOD SSLv3_server_data;
 169
 170         if (init)
 171                 {
 172                 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
 173
 174                 if (init)
 175                         {
 176                         memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
 177                                 sizeof(SSL_METHOD));
 178                         SSLv3_server_data.ssl_accept=ssl3_accept;
 179                         SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
 180                         init=0;
 181                         }
 182
 183                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
 184                 }
 185         return(&SSLv3_server_data);
 186         }
 187
 188 int ssl3_accept(SSL *s)
 189         {
 190         BUF_MEM *buf;
 191         unsigned long l,Time=time(NULL);
 192         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 193         long num1;
 194         int ret= -1;
 195         int new_state,state,skip=0;
 196
 197         RAND_add(&Time,sizeof(Time),0);
 198         ERR_clear_error();
 199         clear_sys_error();
 200
 201         if (s->info_callback != NULL)
 202                 cb=s->info_callback;
 203         else if (s->ctx->info_callback != NULL)
 204                 cb=s->ctx->info_callback;
 205
 206         /* init things to blank */
 207         s->in_handshake++;
 208         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 209
 210         if (s->cert == NULL)
 211                 {
 212                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 213                 return(-1);
 214                 }
 215
 216         for (;;)
 217                 {
 218                 state=s->state;
 219
 220                 switch (s->state)
 221                         {
 222                 case SSL_ST_RENEGOTIATE:
 223                         s->new_session=1;
 224                         /* s->state=SSL_ST_ACCEPT; */
 225
 226                 case SSL_ST_BEFORE:
 227                 case SSL_ST_ACCEPT:
 228                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 229                 case SSL_ST_OK|SSL_ST_ACCEPT:
 230
 231                         s->server=1;
 232                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 233
 234                         if ((s->version>>8) != 3)
 235                                 {
 236                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 237                                 return -1;
 238                                 }
 239                         s->type=SSL_ST_ACCEPT;
 240
 241                         if (s->init_buf == NULL)
 242                                 {
 243                                 if ((buf=BUF_MEM_new()) == NULL)
 244                                         {
 245                                         ret= -1;
 246                                         goto end;
 247                                         }
 248                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 249                                         {
 250                                         ret= -1;
 251                                         goto end;
 252                                         }
 253                                 s->init_buf=buf;
 254                                 }
 255
 256                         if (!ssl3_setup_buffers(s))
 257                                 {
 258                                 ret= -1;
 259                                 goto end;
 260                                 }
 261
 262                         s->init_num=0;
 263
 264                         if (s->state != SSL_ST_RENEGOTIATE)
 265                                 {
 266                                 /* Ok, we now need to push on a buffering BIO so that
 267                                  * the output is sent in a way that TCP likes :-)
 268                                  */
 269                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 270
 271                                 ssl3_init_finished_mac(s);
 272                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 273                                 s->ctx->stats.sess_accept++;
 274                                 }
 275                         else
 276                                 {
 277                                 /* s->state == SSL_ST_RENEGOTIATE,
 278                                  * we will just send a HelloRequest */
 279                                 s->ctx->stats.sess_accept_renegotiate++;
 280                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 281                                 }
 282                         break;
 283
 284                 case SSL3_ST_SW_HELLO_REQ_A:
 285                 case SSL3_ST_SW_HELLO_REQ_B:
 286
 287                         s->shutdown=0;
 288                         ret=ssl3_send_hello_request(s);
 289                         if (ret <= 0) goto end;
 290                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 291                         s->state=SSL3_ST_SW_FLUSH;
 292                         s->init_num=0;
 293
 294                         ssl3_init_finished_mac(s);
 295                         break;
 296
 297                 case SSL3_ST_SW_HELLO_REQ_C:
 298                         s->state=SSL_ST_OK;
 299                         break;
 300
 301                 case SSL3_ST_SR_CLNT_HELLO_A:
 302                 case SSL3_ST_SR_CLNT_HELLO_B:
 303                 case SSL3_ST_SR_CLNT_HELLO_C:
 304
 305                         s->shutdown=0;
 306                         ret=ssl3_get_client_hello(s);
 307                         if (ret <= 0) goto end;
 308                         s->new_session = 2;
 309                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 310                         s->init_num=0;
 311                         break;
 312
 313                 case SSL3_ST_SW_SRVR_HELLO_A:
 314                 case SSL3_ST_SW_SRVR_HELLO_B:
 315                         ret=ssl3_send_server_hello(s);
 316                         if (ret <= 0) goto end;
 317
 318                         if (s->hit)
 319                                 s->state=SSL3_ST_SW_CHANGE_A;
 320                         else
 321                                 s->state=SSL3_ST_SW_CERT_A;
 322                         s->init_num=0;
 323                         break;
 324
 325                 case SSL3_ST_SW_CERT_A:
 326                 case SSL3_ST_SW_CERT_B:
 327                         /* Check if it is anon DH or anon ECDH */
 328                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 329                                 {
 330                                 ret=ssl3_send_server_certificate(s);
 331                                 if (ret <= 0) goto end;
 332                                 }
 333                         else
 334                                 skip=1;
 335                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 336                         s->init_num=0;
 337                         break;
 338
 339                 case SSL3_ST_SW_KEY_EXCH_A:
 340                 case SSL3_ST_SW_KEY_EXCH_B:
 341                         l=s->s3->tmp.new_cipher->algorithms;
 342
 343                         /* clear this, it may get reset by
 344                          * send_server_key_exchange */
 345                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 346 #ifndef OPENSSL_NO_KRB5
 347                                 && !(l & SSL_KRB5)
 348 #endif /* OPENSSL_NO_KRB5 */
 349                                 )
 350                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 351                                  * even when forbidden by protocol specs
 352                                  * (handshake may fail as clients are not required to
 353                                  * be able to handle this) */
 354                                 s->s3->tmp.use_rsa_tmp=1;
 355                         else
 356                                 s->s3->tmp.use_rsa_tmp=0;
 357
 358
 359                         /* only send if a DH key exchange, fortezza or
 360                          * RSA but we have a sign only certificate
 361                          *
 362                          * For ECC ciphersuites, we send a serverKeyExchange
 363                          * message only if the cipher suite is either
 364                          * ECDH-anon or ECDHE. In other cases, the
 365                          * server certificate contains the server's
 366                          * public key for key exchange.
 367                          */
 368                         if (s->s3->tmp.use_rsa_tmp
 369                             || (l & SSL_kECDHE)
 370                             || (l & (SSL_DH|SSL_kFZA))
 371                             || ((l & SSL_kRSA)
 372                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 373                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 374                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 375                                         )
 376                                     )
 377                                 )
 378                             )
 379                                 {
 380                                 ret=ssl3_send_server_key_exchange(s);
 381                                 if (ret <= 0) goto end;
 382                                 }
 383                         else
 384                                 skip=1;
 385
 386                         s->state=SSL3_ST_SW_CERT_REQ_A;
 387                         s->init_num=0;
 388                         break;
 389
 390                 case SSL3_ST_SW_CERT_REQ_A:
 391                 case SSL3_ST_SW_CERT_REQ_B:
 392                         if (/* don't request cert unless asked for it: */
 393                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 394                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 395                                  * don't request cert during re-negotiation: */
 396                                 ((s->session->peer != NULL) &&
 397                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 398                                 /* never request cert in anonymous ciphersuites
 399                                  * (see section "Certificate request" in SSL 3 drafts
 400                                  * and in RFC 2246): */
 401                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 402                                  /* ... except when the application insists on verification
 403                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 404                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 405                                  /* never request cert in Kerberos ciphersuites */
 406                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 407                                 {
 408                                 /* no cert request */
 409                                 skip=1;
 410                                 s->s3->tmp.cert_request=0;
 411                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 412                                 }
 413                         else
 414                                 {
 415                                 s->s3->tmp.cert_request=1;
 416                                 ret=ssl3_send_certificate_request(s);
 417                                 if (ret <= 0) goto end;
 418 #ifndef NETSCAPE_HANG_BUG
 419                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 420 #else
 421                                 s->state=SSL3_ST_SW_FLUSH;
 422                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 423 #endif
 424                                 s->init_num=0;
 425                                 }
 426                         break;
 427
 428                 case SSL3_ST_SW_SRVR_DONE_A:
 429                 case SSL3_ST_SW_SRVR_DONE_B:
 430                         ret=ssl3_send_server_done(s);
 431                         if (ret <= 0) goto end;
 432                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 433                         s->state=SSL3_ST_SW_FLUSH;
 434                         s->init_num=0;
 435                         break;
 436
 437                 case SSL3_ST_SW_FLUSH:
 438                         /* number of bytes to be flushed */
 439                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 440                         if (num1 > 0)
 441                                 {
 442                                 s->rwstate=SSL_WRITING;
 443                                 num1=BIO_flush(s->wbio);
 444                                 if (num1 <= 0) { ret= -1; goto end; }
 445                                 s->rwstate=SSL_NOTHING;
 446                                 }
 447
 448                         s->state=s->s3->tmp.next_state;
 449                         break;
 450
 451                 case SSL3_ST_SR_CERT_A:
 452                 case SSL3_ST_SR_CERT_B:
 453                         /* Check for second client hello (MS SGC) */
 454                         ret = ssl3_check_client_hello(s);
 455                         if (ret <= 0)
 456                                 goto end;
 457                         if (ret == 2)
 458                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 459                         else {
 460                                 if (s->s3->tmp.cert_request)
 461                                         {
 462                                         ret=ssl3_get_client_certificate(s);
 463                                         if (ret <= 0) goto end;
 464                                         }
 465                                 s->init_num=0;
 466                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 467                         }
 468                         break;
 469
 470                 case SSL3_ST_SR_KEY_EXCH_A:
 471                 case SSL3_ST_SR_KEY_EXCH_B:
 472                         ret=ssl3_get_client_key_exchange(s);
 473                         if (ret <= 0)
 474                                 goto end;
 475                         if (ret == 2)
 476                                 {
 477                                 /* For the ECDH ciphersuites when
 478                                  * the client sends its ECDH pub key in
 479                                  * a certificate, the CertificateVerify
 480                                  * message is not sent.
 481                                  */
 482                                 s->state=SSL3_ST_SR_FINISHED_A;
 483                                 s->init_num = 0;
 484                                 }
 485                         else
 486                                 {
 487                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 488                                 s->init_num=0;
 489
 490                                 /* We need to get hashes here so if there is
 491                                  * a client cert, it can be verified
 492                                  */
 493                                 s->method->ssl3_enc->cert_verify_mac(s,
 494                                     &(s->s3->finish_dgst1),
 495                                     &(s->s3->tmp.cert_verify_md[0]));
 496                                 s->method->ssl3_enc->cert_verify_mac(s,
 497                                     &(s->s3->finish_dgst2),
 498                                     &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 499                                 }
 500                         break;
 501
 502                 case SSL3_ST_SR_CERT_VRFY_A:
 503                 case SSL3_ST_SR_CERT_VRFY_B:
 504
 505                         /* we should decide if we expected this one */
 506                         ret=ssl3_get_cert_verify(s);
 507                         if (ret <= 0) goto end;
 508
 509                         s->state=SSL3_ST_SR_FINISHED_A;
 510                         s->init_num=0;
 511                         break;
 512
 513                 case SSL3_ST_SR_FINISHED_A:
 514                 case SSL3_ST_SR_FINISHED_B:
 515                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 516                                 SSL3_ST_SR_FINISHED_B);
 517                         if (ret <= 0) goto end;
 518                         if (s->hit)
 519                                 s->state=SSL_ST_OK;
 520                         else
 521                                 s->state=SSL3_ST_SW_CHANGE_A;
 522                         s->init_num=0;
 523                         break;
 524
 525                 case SSL3_ST_SW_CHANGE_A:
 526                 case SSL3_ST_SW_CHANGE_B:
 527
 528                         s->session->cipher=s->s3->tmp.new_cipher;
 529                         if (!s->method->ssl3_enc->setup_key_block(s))
 530                                 { ret= -1; goto end; }
 531
 532                         ret=ssl3_send_change_cipher_spec(s,
 533                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 534
 535                         if (ret <= 0) goto end;
 536                         s->state=SSL3_ST_SW_FINISHED_A;
 537                         s->init_num=0;
 538
 539                         if (!s->method->ssl3_enc->change_cipher_state(s,
 540                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 541                                 {
 542                                 ret= -1;
 543                                 goto end;
 544                                 }
 545
 546                         break;
 547
 548                 case SSL3_ST_SW_FINISHED_A:
 549                 case SSL3_ST_SW_FINISHED_B:
 550                         ret=ssl3_send_finished(s,
 551                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 552                                 s->method->ssl3_enc->server_finished_label,
 553                                 s->method->ssl3_enc->server_finished_label_len);
 554                         if (ret <= 0) goto end;
 555                         s->state=SSL3_ST_SW_FLUSH;
 556                         if (s->hit)
 557                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 558                         else
 559                                 s->s3->tmp.next_state=SSL_ST_OK;
 560                         s->init_num=0;
 561                         break;
 562
 563                 case SSL_ST_OK:
 564                         /* clean a few things up */
 565                         ssl3_cleanup_key_block(s);
 566
 567                         BUF_MEM_free(s->init_buf);
 568                         s->init_buf=NULL;
 569
 570                         /* remove buffering on output */
 571                         ssl_free_wbio_buffer(s);
 572
 573                         s->init_num=0;
 574
 575                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 576                                 {
 577                                 /* actually not necessarily a 'new' session unless
 578                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 579
 580                                 s->new_session=0;
 581
 582                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 583
 584                                 s->ctx->stats.sess_accept_good++;
 585                                 /* s->server=1; */
 586                                 s->handshake_func=ssl3_accept;
 587
 588                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 589                                 }
 590
 591                         ret = 1;
 592                         goto end;
 593                         /* break; */
 594
 595                 default:
 596                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 597                         ret= -1;
 598                         goto end;
 599                         /* break; */
 600                         }
 601
 602                 if (!s->s3->tmp.reuse_message && !skip)
 603                         {
 604                         if (s->debug)
 605                                 {
 606                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 607                                         goto end;
 608                                 }
 609
 610
 611                         if ((cb != NULL) && (s->state != state))
 612                                 {
 613                                 new_state=s->state;
 614                                 s->state=state;
 615                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 616                                 s->state=new_state;
 617                                 }
 618                         }
 619                 skip=0;
 620                 }
 621 end:
 622         /* BIO_flush(s->wbio); */
 623
 624         s->in_handshake--;
 625         if (cb != NULL)
 626                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 627         return(ret);
 628         }
 629
 630 static int ssl3_send_hello_request(SSL *s)
 631         {
 632         unsigned char *p;
 633
 634         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 635                 {
 636                 p=(unsigned char *)s->init_buf->data;
 637                 *(p++)=SSL3_MT_HELLO_REQUEST;
 638                 *(p++)=0;
 639                 *(p++)=0;
 640                 *(p++)=0;
 641
 642                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 643                 /* number of bytes to write */
 644                 s->init_num=4;
 645                 s->init_off=0;
 646                 }
 647
 648         /* SSL3_ST_SW_HELLO_REQ_B */
 649         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 650         }
 651
 652 static int ssl3_check_client_hello(SSL *s)
 653         {
 654         int ok;
 655         long n;
 656
 657         /* this function is called when we really expect a Certificate message,
 658          * so permit appropriate message length */
 659         n=ssl3_get_message(s,
 660                 SSL3_ST_SR_CERT_A,
 661                 SSL3_ST_SR_CERT_B,
 662                 -1,
 663                 s->max_cert_list,
 664                 &ok);
 665         if (!ok) return((int)n);
 666         s->s3->tmp.reuse_message = 1;
 667         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 668                 {
 669                 /* Throw away what we have done so far in the current handshake,
 670                  * which will now be aborted. (A full SSL_clear would be too much.)
 671                  * I hope that tmp.dh is the only thing that may need to be cleared
 672                  * when a handshake is not completed ... */
 673 #ifndef OPENSSL_NO_DH
 674                 if (s->s3->tmp.dh != NULL)
 675                         {
 676                         DH_free(s->s3->tmp.dh);
 677                         s->s3->tmp.dh = NULL;
 678                         }
 679 #endif
 680                 return 2;
 681                 }
 682         return 1;
 683 }
 684
 685 static int ssl3_get_client_hello(SSL *s)
 686         {
 687         int i,j,ok,al,ret= -1;
 688         long n;
 689         unsigned long id;
 690         unsigned char *p,*d,*q;
 691         SSL_CIPHER *c;
 692         SSL_COMP *comp=NULL;
 693         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 694
 695         /* We do this so that we will respond with our native type.
 696          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 697          * This down switching should be handled by a different method.
 698          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 699          * TLSv1.
 700          */
 701         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 702                 {
 703                 s->first_packet=1;
 704                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 705                 }
 706         n=ssl3_get_message(s,
 707                 SSL3_ST_SR_CLNT_HELLO_B,
 708                 SSL3_ST_SR_CLNT_HELLO_C,
 709                 SSL3_MT_CLIENT_HELLO,
 710                 SSL3_RT_MAX_PLAIN_LENGTH,
 711                 &ok);
 712
 713         if (!ok) return((int)n);
 714         d=p=(unsigned char *)s->init_msg;
 715
 716         /* use version from inside client hello, not from record header
 717          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 718         s->client_version=(((int)p[0])<<8)|(int)p[1];
 719         p+=2;
 720
 721         if (s->client_version < s->version)
 722                 {
 723                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 724                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 725                         {
 726                         /* similar to ssl3_get_record, send alert using remote version number */
 727                         s->version = s->client_version;
 728                         }
 729                 al = SSL_AD_PROTOCOL_VERSION;
 730                 goto f_err;
 731                 }
 732
 733         /* load the client random */
 734         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 735         p+=SSL3_RANDOM_SIZE;
 736
 737         /* get the session-id */
 738         j= *(p++);
 739
 740         s->hit=0;
 741         /* Versions before 0.9.7 always allow session reuse during renegotiation
 742          * (i.e. when s->new_session is true), option
 743          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
 744          * Maybe this optional behaviour should always have been the default,
 745          * but we cannot safely change the default behaviour (or new applications
 746          * might be written that become totally unsecure when compiled with
 747          * an earlier library version)
 748          */
 749         if (j == 0 || (s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 750                 {
 751                 if (!ssl_get_new_session(s,1))
 752                         goto err;
 753                 }
 754         else
 755                 {
 756                 i=ssl_get_prev_session(s,p,j);
 757                 if (i == 1)
 758                         { /* previous session */
 759                         s->hit=1;
 760                         }
 761                 else if (i == -1)
 762                         goto err;
 763                 else /* i == 0 */
 764                         {
 765                         if (!ssl_get_new_session(s,1))
 766                                 goto err;
 767                         }
 768                 }
 769
 770         p+=j;
 771         n2s(p,i);
 772         if ((i == 0) && (j != 0))
 773                 {
 774                 /* we need a cipher if we are not resuming a session */
 775                 al=SSL_AD_ILLEGAL_PARAMETER;
 776                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 777                 goto f_err;
 778                 }
 779         if ((p+i) >= (d+n))
 780                 {
 781                 /* not enough data */
 782                 al=SSL_AD_DECODE_ERROR;
 783                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 784                 goto f_err;
 785                 }
 786         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 787                 == NULL))
 788                 {
 789                 goto err;
 790                 }
 791         p+=i;
 792
 793         /* If it is a hit, check that the cipher is in the list */
 794         if ((s->hit) && (i > 0))
 795                 {
 796                 j=0;
 797                 id=s->session->cipher->id;
 798
 799 #ifdef CIPHER_DEBUG
 800                 printf("client sent %d ciphers\n",sk_num(ciphers));
 801 #endif
 802                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 803                         {
 804                         c=sk_SSL_CIPHER_value(ciphers,i);
 805 #ifdef CIPHER_DEBUG
 806                         printf("client [%2d of %2d]:%s\n",
 807                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 808 #endif
 809                         if (c->id == id)
 810                                 {
 811                                 j=1;
 812                                 break;
 813                                 }
 814                         }
 815                 if (j == 0)
 816                         {
 817                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 818                                 {
 819                                 /* Very bad for multi-threading.... */
 820                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
 821                                                                        0);
 822                                 }
 823                         else
 824                                 {
 825                                 /* we need to have the cipher in the cipher
 826                                  * list if we are asked to reuse it */
 827                                 al=SSL_AD_ILLEGAL_PARAMETER;
 828                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 829                                 goto f_err;
 830                                 }
 831                         }
 832                 }
 833
 834         /* compression */
 835         i= *(p++);
 836         if ((p+i) > (d+n))
 837                 {
 838                 /* not enough data */
 839                 al=SSL_AD_DECODE_ERROR;
 840                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 841                 goto f_err;
 842                 }
 843         q=p;
 844         for (j=0; j<i; j++)
 845                 {
 846                 if (p[j] == 0) break;
 847                 }
 848
 849         p+=i;
 850         if (j >= i)
 851                 {
 852                 /* no compress */
 853                 al=SSL_AD_DECODE_ERROR;
 854                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 855                 goto f_err;
 856                 }
 857
 858         /* Worst case, we will use the NULL compression, but if we have other
 859          * options, we will now look for them.  We have i-1 compression
 860          * algorithms from the client, starting at q. */
 861         s->s3->tmp.new_compression=NULL;
 862         if (s->ctx->comp_methods != NULL)
 863                 { /* See if we have a match */
 864                 int m,nn,o,v,done=0;
 865
 866                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
 867                 for (m=0; m<nn; m++)
 868                         {
 869                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
 870                         v=comp->id;
 871                         for (o=0; o<i; o++)
 872                                 {
 873                                 if (v == q[o])
 874                                         {
 875                                         done=1;
 876                                         break;
 877                                         }
 878                                 }
 879                         if (done) break;
 880                         }
 881                 if (done)
 882                         s->s3->tmp.new_compression=comp;
 883                 else
 884                         comp=NULL;
 885                 }
 886
 887         /* TLS does not mind if there is extra stuff */
 888 #if 0   /* SSL 3.0 does not mind either, so we should disable this test
 889          * (was enabled in 0.9.6d through 0.9.6j and 0.9.7 through 0.9.7b,
 890          * in earlier SSLeay/OpenSSL releases this test existed but was buggy) */
 891         if (s->version == SSL3_VERSION)
 892                 {
 893                 if (p < (d+n))
 894                         {
 895                         /* wrong number of bytes,
 896                          * there could be more to follow */
 897                         al=SSL_AD_DECODE_ERROR;
 898                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 899                         goto f_err;
 900                         }
 901                 }
 902 #endif
 903
 904         /* Given s->session->ciphers and SSL_get_ciphers, we must
 905          * pick a cipher */
 906
 907         if (!s->hit)
 908                 {
 909                 s->session->compress_meth=(comp == NULL)?0:comp->id;
 910                 if (s->session->ciphers != NULL)
 911                         sk_SSL_CIPHER_free(s->session->ciphers);
 912                 s->session->ciphers=ciphers;
 913                 if (ciphers == NULL)
 914                         {
 915                         al=SSL_AD_ILLEGAL_PARAMETER;
 916                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 917                         goto f_err;
 918                         }
 919                 ciphers=NULL;
 920                 c=ssl3_choose_cipher(s,s->session->ciphers,
 921                                      SSL_get_ciphers(s));
 922
 923                 if (c == NULL)
 924                         {
 925                         al=SSL_AD_HANDSHAKE_FAILURE;
 926                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 927                         goto f_err;
 928                         }
 929                 s->s3->tmp.new_cipher=c;
 930                 }
 931         else
 932                 {
 933                 /* Session-id reuse */
 934 #ifdef REUSE_CIPHER_BUG
 935                 STACK_OF(SSL_CIPHER) *sk;
 936                 SSL_CIPHER *nc=NULL;
 937                 SSL_CIPHER *ec=NULL;
 938
 939                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 940                         {
 941                         sk=s->session->ciphers;
 942                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
 943                                 {
 944                                 c=sk_SSL_CIPHER_value(sk,i);
 945                                 if (c->algorithms & SSL_eNULL)
 946                                         nc=c;
 947                                 if (SSL_C_IS_EXPORT(c))
 948                                         ec=c;
 949                                 }
 950                         if (nc != NULL)
 951                                 s->s3->tmp.new_cipher=nc;
 952                         else if (ec != NULL)
 953                                 s->s3->tmp.new_cipher=ec;
 954                         else
 955                                 s->s3->tmp.new_cipher=s->session->cipher;
 956                         }
 957                 else
 958 #endif
 959                 s->s3->tmp.new_cipher=s->session->cipher;
 960                 }
 961
 962         /* we now have the following setup.
 963          * client_random
 964          * cipher_list          - our prefered list of ciphers
 965          * ciphers              - the clients prefered list of ciphers
 966          * compression          - basically ignored right now
 967          * ssl version is set   - sslv3
 968          * s->session           - The ssl session has been setup.
 969          * s->hit               - session reuse flag
 970          * s->tmp.new_cipher    - the new cipher to use.
 971          */
 972
 973         ret=1;
 974         if (0)
 975                 {
 976 f_err:
 977                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 978                 }
 979 err:
 980         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
 981         return(ret);
 982         }
 983
 984 static int ssl3_send_server_hello(SSL *s)
 985         {
 986         unsigned char *buf;
 987         unsigned char *p,*d;
 988         int i,sl;
 989         unsigned long l,Time;
 990
 991         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 992                 {
 993                 buf=(unsigned char *)s->init_buf->data;
 994                 p=s->s3->server_random;
 995                 Time=time(NULL);                        /* Time */
 996                 l2n(Time,p);
 997                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-sizeof(Time));
 998                 /* Do the message type and length last */
 999                 d=p= &(buf[4]);
1000
1001                 *(p++)=s->version>>8;
1002                 *(p++)=s->version&0xff;
1003
1004                 /* Random stuff */
1005                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1006                 p+=SSL3_RANDOM_SIZE;
1007
1008                 /* now in theory we have 3 options to sending back the
1009                  * session id.  If it is a re-use, we send back the
1010                  * old session-id, if it is a new session, we send
1011                  * back the new session-id or we send back a 0 length
1012                  * session-id if we want it to be single use.
1013                  * Currently I will not implement the '0' length session-id
1014                  * 12-Jan-98 - I'll now support the '0' length stuff.
1015                  */
1016                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
1017                         s->session->session_id_length=0;
1018
1019                 sl=s->session->session_id_length;
1020                 if (sl > (int)sizeof(s->session->session_id))
1021                         {
1022                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1023                         return -1;
1024                         }
1025                 *(p++)=sl;
1026                 memcpy(p,s->session->session_id,sl);
1027                 p+=sl;
1028
1029                 /* put the cipher */
1030                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1031                 p+=i;
1032
1033                 /* put the compression method */
1034                 if (s->s3->tmp.new_compression == NULL)
1035                         *(p++)=0;
1036                 else
1037                         *(p++)=s->s3->tmp.new_compression->id;
1038
1039                 /* do the header */
1040                 l=(p-d);
1041                 d=buf;
1042                 *(d++)=SSL3_MT_SERVER_HELLO;
1043                 l2n3(l,d);
1044
1045                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
1046                 /* number of bytes to write */
1047                 s->init_num=p-buf;
1048                 s->init_off=0;
1049                 }
1050
1051         /* SSL3_ST_CW_CLNT_HELLO_B */
1052         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1053         }
1054
1055 static int ssl3_send_server_done(SSL *s)
1056         {
1057         unsigned char *p;
1058
1059         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1060                 {
1061                 p=(unsigned char *)s->init_buf->data;
1062
1063                 /* do the header */
1064                 *(p++)=SSL3_MT_SERVER_DONE;
1065                 *(p++)=0;
1066                 *(p++)=0;
1067                 *(p++)=0;
1068
1069                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1070                 /* number of bytes to write */
1071                 s->init_num=4;
1072                 s->init_off=0;
1073                 }
1074
1075         /* SSL3_ST_CW_CLNT_HELLO_B */
1076         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1077         }
1078
1079 static int ssl3_send_server_key_exchange(SSL *s)
1080         {
1081 #ifndef OPENSSL_NO_RSA
1082         unsigned char *q;
1083         int j,num;
1084         RSA *rsa;
1085         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1086         unsigned int u;
1087 #endif
1088 #ifndef OPENSSL_NO_DH
1089         DH *dh=NULL,*dhp;
1090 #endif
1091 #ifndef OPENSSL_NO_ECDH
1092         EC_KEY *ecdh=NULL, *ecdhp;
1093         unsigned char *encodedPoint = NULL;
1094         int encodedlen = 0;
1095         int curve_id = 0;
1096         BN_CTX *bn_ctx = NULL;
1097 #endif
1098         EVP_PKEY *pkey;
1099         unsigned char *p,*d;
1100         int al,i;
1101         unsigned long type;
1102         int n;
1103         CERT *cert;
1104         BIGNUM *r[4];
1105         int nr[4],kn;
1106         BUF_MEM *buf;
1107         EVP_MD_CTX md_ctx;
1108
1109         EVP_MD_CTX_init(&md_ctx);
1110         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1111                 {
1112                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1113                 cert=s->cert;
1114
1115                 buf=s->init_buf;
1116
1117                 r[0]=r[1]=r[2]=r[3]=NULL;
1118                 n=0;
1119 #ifndef OPENSSL_NO_RSA
1120                 if (type & SSL_kRSA)
1121                         {
1122                         rsa=cert->rsa_tmp;
1123                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1124                                 {
1125                                 rsa=s->cert->rsa_tmp_cb(s,
1126                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1127                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1128                                 if(rsa == NULL)
1129                                 {
1130                                         al=SSL_AD_HANDSHAKE_FAILURE;
1131                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1132                                         goto f_err;
1133                                 }
1134                                 RSA_up_ref(rsa);
1135                                 cert->rsa_tmp=rsa;
1136                                 }
1137                         if (rsa == NULL)
1138                                 {
1139                                 al=SSL_AD_HANDSHAKE_FAILURE;
1140                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1141                                 goto f_err;
1142                                 }
1143                         r[0]=rsa->n;
1144                         r[1]=rsa->e;
1145                         s->s3->tmp.use_rsa_tmp=1;
1146                         }
1147                 else
1148 #endif
1149 #ifndef OPENSSL_NO_DH
1150                         if (type & SSL_kEDH)
1151                         {
1152                         dhp=cert->dh_tmp;
1153                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1154                                 dhp=s->cert->dh_tmp_cb(s,
1155                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1156                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1157                         if (dhp == NULL)
1158                                 {
1159                                 al=SSL_AD_HANDSHAKE_FAILURE;
1160                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1161                                 goto f_err;
1162                                 }
1163
1164                         if (s->s3->tmp.dh != NULL)
1165                                 {
1166                                 DH_free(dh);
1167                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1168                                 goto err;
1169                                 }
1170
1171                         if ((dh=DHparams_dup(dhp)) == NULL)
1172                                 {
1173                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1174                                 goto err;
1175                                 }
1176
1177                         s->s3->tmp.dh=dh;
1178                         if ((dhp->pub_key == NULL ||
1179                              dhp->priv_key == NULL ||
1180                              (s->options & SSL_OP_SINGLE_DH_USE)))
1181                                 {
1182                                 if(!DH_generate_key(dh))
1183                                     {
1184                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1185                                            ERR_R_DH_LIB);
1186                                     goto err;
1187                                     }
1188                                 }
1189                         else
1190                                 {
1191                                 dh->pub_key=BN_dup(dhp->pub_key);
1192                                 dh->priv_key=BN_dup(dhp->priv_key);
1193                                 if ((dh->pub_key == NULL) ||
1194                                         (dh->priv_key == NULL))
1195                                         {
1196                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1197                                         goto err;
1198                                         }
1199                                 }
1200                         r[0]=dh->p;
1201                         r[1]=dh->g;
1202                         r[2]=dh->pub_key;
1203                         }
1204                 else
1205 #endif
1206 #ifndef OPENSSL_NO_ECDH
1207                         if (type & SSL_kECDHE)
1208                         {
1209                         ecdhp=cert->ecdh_tmp;
1210                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1211                                 {
1212                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1213                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1214                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1215                                 }
1216                         if (ecdhp == NULL)
1217                                 {
1218                                 al=SSL_AD_HANDSHAKE_FAILURE;
1219                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1220                                 goto f_err;
1221                                 }
1222
1223                         if (s->s3->tmp.ecdh != NULL)
1224                                 {
1225                                 EC_KEY_free(s->s3->tmp.ecdh);
1226                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1227                                 goto err;
1228                                 }
1229
1230                         /* Duplicate the ECDH structure. */
1231                         if (ecdhp == NULL)
1232                                 {
1233                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1234                                 goto err;
1235                                 }
1236                         if (!EC_KEY_up_ref(ecdhp))
1237                                 {
1238                                 SSLerr(SSL_F_SSL3_CTRL,ERR_R_ECDH_LIB);
1239                                 goto err;
1240                                 }
1241                         ecdh = ecdhp;
1242
1243                         s->s3->tmp.ecdh=ecdh;
1244                         if ((ecdh->pub_key == NULL) ||
1245                             (ecdh->priv_key == NULL) ||
1246                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1247                                 {
1248                                 if(!EC_KEY_generate_key(ecdh))
1249                                     {
1250                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1251                                     goto err;
1252                                     }
1253                                 }
1254
1255                         if ((ecdh->group == NULL) ||
1256                             (ecdh->pub_key == NULL) ||
1257                             (ecdh->priv_key == NULL))
1258                                 {
1259                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1260                                 goto err;
1261                                 }
1262
1263                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1264                             (EC_GROUP_get_degree(ecdh->group) > 163))
1265                                 {
1266                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1267                                 goto err;
1268                                 }
1269
1270                         /* XXX: For now, we only support ephemeral ECDH
1271                          * keys over named (not generic) curves. For
1272                          * supported named curves, curve_id is non-zero.
1273                          */
1274                         if ((curve_id =
1275                             nid2curve_id(EC_GROUP_get_nid(ecdh->group)))
1276                             == 0)
1277                                 {
1278                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1279                                 goto err;
1280                                 }
1281
1282                         /* Encode the public key.
1283                          * First check the size of encoding and
1284                          * allocate memory accordingly.
1285                          */
1286                         encodedlen = EC_POINT_point2oct(ecdh->group,
1287                             ecdh->pub_key,
1288                             POINT_CONVERSION_UNCOMPRESSED,
1289                             NULL, 0, NULL);
1290
1291                         encodedPoint = (unsigned char *)
1292                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1293                         bn_ctx = BN_CTX_new();
1294                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1295                                 {
1296                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1297                                 goto err;
1298                                 }
1299
1300
1301                         encodedlen = EC_POINT_point2oct(ecdh->group,
1302                             ecdh->pub_key,
1303                             POINT_CONVERSION_UNCOMPRESSED,
1304                             encodedPoint, encodedlen, bn_ctx);
1305
1306                         if (encodedlen == 0)
1307                                 {
1308                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1309                                 goto err;
1310                                 }
1311
1312                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1313
1314                         /* XXX: For now, we only support named (not
1315                          * generic) curves in ECDH ephemeral key exchanges.
1316                          * In this situation, we need three additional bytes
1317                          * to encode the entire ServerECDHParams
1318                          * structure.
1319                          */
1320                         n = 3 + encodedlen;
1321
1322                         /* We'll generate the serverKeyExchange message
1323                          * explicitly so we can set these to NULLs
1324                          */
1325                         r[0]=NULL;
1326                         r[1]=NULL;
1327                         r[2]=NULL;
1328                         }
1329                 else
1330 #endif /* !OPENSSL_NO_ECDH */
1331                         {
1332                         al=SSL_AD_HANDSHAKE_FAILURE;
1333                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1334                         goto f_err;
1335                         }
1336                 for (i=0; r[i] != NULL; i++)
1337                         {
1338                         nr[i]=BN_num_bytes(r[i]);
1339                         n+=2+nr[i];
1340                         }
1341
1342                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1343                         {
1344                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1345                                 == NULL)
1346                                 {
1347                                 al=SSL_AD_DECODE_ERROR;
1348                                 goto f_err;
1349                                 }
1350                         kn=EVP_PKEY_size(pkey);
1351                         }
1352                 else
1353                         {
1354                         pkey=NULL;
1355                         kn=0;
1356                         }
1357
1358                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1359                         {
1360                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1361                         goto err;
1362                         }
1363                 d=(unsigned char *)s->init_buf->data;
1364                 p= &(d[4]);
1365
1366                 for (i=0; r[i] != NULL; i++)
1367                         {
1368                         s2n(nr[i],p);
1369                         BN_bn2bin(r[i],p);
1370                         p+=nr[i];
1371                         }
1372
1373 #ifndef OPENSSL_NO_ECDH
1374                 if (type & SSL_kECDHE)
1375                         {
1376                         /* XXX: For now, we only support named (not generic) curves.
1377                          * In this situation, the serverKeyExchange message has:
1378                          * [1 byte CurveType], [1 byte CurveName]
1379                          * [1 byte length of encoded point], followed by
1380                          * the actual encoded point itself
1381                          */
1382                         *p = NAMED_CURVE_TYPE;
1383                         p += 1;
1384                         *p = curve_id;
1385                         p += 1;
1386                         *p = encodedlen;
1387                         p += 1;
1388                         memcpy((unsigned char*)p,
1389                             (unsigned char *)encodedPoint,
1390                             encodedlen);
1391                         OPENSSL_free(encodedPoint);
1392                         p += encodedlen;
1393                         }
1394 #endif
1395
1396                 /* not anonymous */
1397                 if (pkey != NULL)
1398                         {
1399                         /* n is the length of the params, they start at &(d[4])
1400                          * and p points to the space at the end. */
1401 #ifndef OPENSSL_NO_RSA
1402                         if (pkey->type == EVP_PKEY_RSA)
1403                                 {
1404                                 q=md_buf;
1405                                 j=0;
1406                                 for (num=2; num > 0; num--)
1407                                         {
1408                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1409                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1410                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1411                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1412                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1413                                         EVP_DigestFinal_ex(&md_ctx,q,
1414                                                 (unsigned int *)&i);
1415                                         q+=i;
1416                                         j+=i;
1417                                         }
1418                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1419                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1420                                         {
1421                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1422                                         goto err;
1423                                         }
1424                                 s2n(u,p);
1425                                 n+=u+2;
1426                                 }
1427                         else
1428 #endif
1429 #if !defined(OPENSSL_NO_DSA)
1430                                 if (pkey->type == EVP_PKEY_DSA)
1431                                 {
1432                                 /* lets do DSS */
1433                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1434                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1435                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1436                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1437                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1438                                         (unsigned int *)&i,pkey))
1439                                         {
1440                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1441                                         goto err;
1442                                         }
1443                                 s2n(i,p);
1444                                 n+=i+2;
1445                                 }
1446                         else
1447 #endif
1448 #if !defined(OPENSSL_NO_ECDSA)
1449                                 if (pkey->type == EVP_PKEY_EC)
1450                                 {
1451                                 /* let's do ECDSA */
1452                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1453                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1454                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1455                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1456                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1457                                         (unsigned int *)&i,pkey))
1458                                         {
1459                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1460                                         goto err;
1461                                         }
1462                                 s2n(i,p);
1463                                 n+=i+2;
1464                                 }
1465                         else
1466 #endif
1467                                 {
1468                                 /* Is this error check actually needed? */
1469                                 al=SSL_AD_HANDSHAKE_FAILURE;
1470                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1471                                 goto f_err;
1472                                 }
1473                         }
1474
1475                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1476                 l2n3(n,d);
1477
1478                 /* we should now have things packed up, so lets send
1479                  * it off */
1480                 s->init_num=n+4;
1481                 s->init_off=0;
1482                 }
1483
1484         s->state = SSL3_ST_SW_KEY_EXCH_B;
1485         EVP_MD_CTX_cleanup(&md_ctx);
1486         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1487 f_err:
1488         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1489 err:
1490 #ifndef OPENSSL_NO_ECDH
1491         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1492         BN_CTX_free(bn_ctx);
1493 #endif
1494         EVP_MD_CTX_cleanup(&md_ctx);
1495         return(-1);
1496         }
1497
1498 static int ssl3_send_certificate_request(SSL *s)
1499         {
1500         unsigned char *p,*d;
1501         int i,j,nl,off,n;
1502         STACK_OF(X509_NAME) *sk=NULL;
1503         X509_NAME *name;
1504         BUF_MEM *buf;
1505
1506         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1507                 {
1508                 buf=s->init_buf;
1509
1510                 d=p=(unsigned char *)&(buf->data[4]);
1511
1512                 /* get the list of acceptable cert types */
1513                 p++;
1514                 n=ssl3_get_req_cert_type(s,p);
1515                 d[0]=n;
1516                 p+=n;
1517                 n++;
1518
1519                 off=n;
1520                 p+=2;
1521                 n+=2;
1522
1523                 sk=SSL_get_client_CA_list(s);
1524                 nl=0;
1525                 if (sk != NULL)
1526                         {
1527                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1528                                 {
1529                                 name=sk_X509_NAME_value(sk,i);
1530                                 j=i2d_X509_NAME(name,NULL);
1531                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1532                                         {
1533                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1534                                         goto err;
1535                                         }
1536                                 p=(unsigned char *)&(buf->data[4+n]);
1537                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1538                                         {
1539                                         s2n(j,p);
1540                                         i2d_X509_NAME(name,&p);
1541                                         n+=2+j;
1542                                         nl+=2+j;
1543                                         }
1544                                 else
1545                                         {
1546                                         d=p;
1547                                         i2d_X509_NAME(name,&p);
1548                                         j-=2; s2n(j,d); j+=2;
1549                                         n+=j;
1550                                         nl+=j;
1551                                         }
1552                                 }
1553                         }
1554                 /* else no CA names */
1555                 p=(unsigned char *)&(buf->data[4+off]);
1556                 s2n(nl,p);
1557
1558                 d=(unsigned char *)buf->data;
1559                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1560                 l2n3(n,d);
1561
1562                 /* we should now have things packed up, so lets send
1563                  * it off */
1564
1565                 s->init_num=n+4;
1566                 s->init_off=0;
1567 #ifdef NETSCAPE_HANG_BUG
1568                 p=(unsigned char *)s->init_buf->data + s->init_num;
1569
1570                 /* do the header */
1571                 *(p++)=SSL3_MT_SERVER_DONE;
1572                 *(p++)=0;
1573                 *(p++)=0;
1574                 *(p++)=0;
1575                 s->init_num += 4;
1576 #endif
1577
1578                 s->state = SSL3_ST_SW_CERT_REQ_B;
1579                 }
1580
1581         /* SSL3_ST_SW_CERT_REQ_B */
1582         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1583 err:
1584         return(-1);
1585         }
1586
1587
1588 static const int KDF1_SHA1_len = 20;
1589 static void *KDF1_SHA1(void *in, size_t inlen, void *out, size_t outlen)
1590         {
1591 #ifndef OPENSSL_NO_SHA
1592         if (outlen != SHA_DIGEST_LENGTH)
1593                 return NULL;
1594         return SHA1(in, inlen, out);
1595 #else
1596         return NULL;
1597 #endif
1598         }
1599
1600 static int ssl3_get_client_key_exchange(SSL *s)
1601         {
1602         int i,al,ok;
1603         long n;
1604         unsigned long l;
1605         unsigned char *p;
1606 #ifndef OPENSSL_NO_RSA
1607         RSA *rsa=NULL;
1608         EVP_PKEY *pkey=NULL;
1609 #endif
1610 #ifndef OPENSSL_NO_DH
1611         BIGNUM *pub=NULL;
1612         DH *dh_srvr;
1613 #endif
1614 #ifndef OPENSSL_NO_KRB5
1615         KSSL_ERR kssl_err;
1616 #endif /* OPENSSL_NO_KRB5 */
1617
1618 #ifndef OPENSSL_NO_ECDH
1619         EC_KEY *srvr_ecdh = NULL;
1620         EVP_PKEY *clnt_pub_pkey = NULL;
1621         EC_POINT *clnt_ecpoint = NULL;
1622         BN_CTX *bn_ctx = NULL;
1623 #endif
1624
1625         n=ssl3_get_message(s,
1626                 SSL3_ST_SR_KEY_EXCH_A,
1627                 SSL3_ST_SR_KEY_EXCH_B,
1628                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1629                 2048, /* ??? */
1630                 &ok);
1631
1632         if (!ok) return((int)n);
1633         p=(unsigned char *)s->init_msg;
1634
1635         l=s->s3->tmp.new_cipher->algorithms;
1636
1637 #ifndef OPENSSL_NO_RSA
1638         if (l & SSL_kRSA)
1639                 {
1640                 /* FIX THIS UP EAY EAY EAY EAY */
1641                 if (s->s3->tmp.use_rsa_tmp)
1642                         {
1643                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1644                                 rsa=s->cert->rsa_tmp;
1645                         /* Don't do a callback because rsa_tmp should
1646                          * be sent already */
1647                         if (rsa == NULL)
1648                                 {
1649                                 al=SSL_AD_HANDSHAKE_FAILURE;
1650                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1651                                 goto f_err;
1652
1653                                 }
1654                         }
1655                 else
1656                         {
1657                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1658                         if (    (pkey == NULL) ||
1659                                 (pkey->type != EVP_PKEY_RSA) ||
1660                                 (pkey->pkey.rsa == NULL))
1661                                 {
1662                                 al=SSL_AD_HANDSHAKE_FAILURE;
1663                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1664                                 goto f_err;
1665                                 }
1666                         rsa=pkey->pkey.rsa;
1667                         }
1668
1669                 /* TLS */
1670                 if (s->version > SSL3_VERSION)
1671                         {
1672                         n2s(p,i);
1673                         if (n != i+2)
1674                                 {
1675                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1676                                         {
1677                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1678                                         goto err;
1679                                         }
1680                                 else
1681                                         p-=2;
1682                                 }
1683                         else
1684                                 n=i;
1685                         }
1686
1687                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1688
1689                 al = -1;
1690
1691                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1692                         {
1693                         al=SSL_AD_DECODE_ERROR;
1694                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
1695                         }
1696
1697                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1698                         {
1699                         /* The premaster secret must contain the same version number as the
1700                          * ClientHello to detect version rollback attacks (strangely, the
1701                          * protocol does not offer such protection for DH ciphersuites).
1702                          * However, buggy clients exist that send the negotiated protocol
1703                          * version instead if the server does not support the requested
1704                          * protocol version.
1705                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1706                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1707                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1708                                 {
1709                                 al=SSL_AD_DECODE_ERROR;
1710                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1711
1712                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1713                                  * (http://eprint.iacr.org/2003/052/) exploits the version
1714                                  * number check as a "bad version oracle" -- an alert would
1715                                  * reveal that the plaintext corresponding to some ciphertext
1716                                  * made up by the adversary is properly formatted except
1717                                  * that the version number is wrong.  To avoid such attacks,
1718                                  * we should treat this just like any other decryption error. */
1719                                 }
1720                         }
1721
1722                 if (al != -1)
1723                         {
1724                         /* Some decryption failure -- use random value instead as countermeasure
1725                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1726                          * (see RFC 2246, section 7.4.7.1). */
1727                         ERR_clear_error();
1728                         i = SSL_MAX_MASTER_KEY_LENGTH;
1729                         p[0] = s->client_version >> 8;
1730                         p[1] = s->client_version & 0xff;
1731                         RAND_pseudo_bytes(p+2, i-2); /* should be RAND_bytes, but we cannot work around a failure */
1732                         }
1733
1734                 s->session->master_key_length=
1735                         s->method->ssl3_enc->generate_master_secret(s,
1736                                 s->session->master_key,
1737                                 p,i);
1738                 OPENSSL_cleanse(p,i);
1739                 }
1740         else
1741 #endif
1742 #ifndef OPENSSL_NO_DH
1743                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1744                 {
1745                 n2s(p,i);
1746                 if (n != i+2)
1747                         {
1748                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1749                                 {
1750                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1751                                 goto err;
1752                                 }
1753                         else
1754                                 {
1755                                 p-=2;
1756                                 i=(int)n;
1757                                 }
1758                         }
1759
1760                 if (n == 0L) /* the parameters are in the cert */
1761                         {
1762                         al=SSL_AD_HANDSHAKE_FAILURE;
1763                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1764                         goto f_err;
1765                         }
1766                 else
1767                         {
1768                         if (s->s3->tmp.dh == NULL)
1769                                 {
1770                                 al=SSL_AD_HANDSHAKE_FAILURE;
1771                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1772                                 goto f_err;
1773                                 }
1774                         else
1775                                 dh_srvr=s->s3->tmp.dh;
1776                         }
1777
1778                 pub=BN_bin2bn(p,i,NULL);
1779                 if (pub == NULL)
1780                         {
1781                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1782                         goto err;
1783                         }
1784
1785                 i=DH_compute_key(p,pub,dh_srvr);
1786
1787                 if (i <= 0)
1788                         {
1789                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1790                         goto err;
1791                         }
1792
1793                 DH_free(s->s3->tmp.dh);
1794                 s->s3->tmp.dh=NULL;
1795
1796                 BN_clear_free(pub);
1797                 pub=NULL;
1798                 s->session->master_key_length=
1799                         s->method->ssl3_enc->generate_master_secret(s,
1800                                 s->session->master_key,p,i);
1801                 OPENSSL_cleanse(p,i);
1802                 }
1803         else
1804 #endif
1805 #ifndef OPENSSL_NO_KRB5
1806         if (l & SSL_kKRB5)
1807                 {
1808                 krb5_error_code         krb5rc;
1809                 krb5_data               enc_ticket;
1810                 krb5_data               authenticator;
1811                 krb5_data               enc_pms;
1812                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
1813                 EVP_CIPHER_CTX          ciph_ctx;
1814                 EVP_CIPHER              *enc = NULL;
1815                 unsigned char           iv[EVP_MAX_IV_LENGTH];
1816                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
1817                                                + EVP_MAX_BLOCK_LENGTH];
1818                 int                     padl, outl;
1819                 krb5_timestamp          authtime = 0;
1820                 krb5_ticket_times       ttimes;
1821
1822                 EVP_CIPHER_CTX_init(&ciph_ctx);
1823
1824                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
1825
1826                 n2s(p,i);
1827                 enc_ticket.length = i;
1828                 enc_ticket.data = (char *)p;
1829                 p+=enc_ticket.length;
1830
1831                 n2s(p,i);
1832                 authenticator.length = i;
1833                 authenticator.data = (char *)p;
1834                 p+=authenticator.length;
1835
1836                 n2s(p,i);
1837                 enc_pms.length = i;
1838                 enc_pms.data = (char *)p;
1839                 p+=enc_pms.length;
1840
1841                 /* Note that the length is checked again below,
1842                 ** after decryption
1843                 */
1844                 if(enc_pms.length > sizeof pms)
1845                         {
1846                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1847                                SSL_R_DATA_LENGTH_TOO_LONG);
1848                         goto err;
1849                         }
1850
1851                 if (n != enc_ticket.length + authenticator.length +
1852                                                 enc_pms.length + 6)
1853                         {
1854                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1855                                 SSL_R_DATA_LENGTH_TOO_LONG);
1856                         goto err;
1857                         }
1858
1859                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
1860                                         &kssl_err)) != 0)
1861                         {
1862 #ifdef KSSL_DEBUG
1863                         printf("kssl_sget_tkt rtn %d [%d]\n",
1864                                 krb5rc, kssl_err.reason);
1865                         if (kssl_err.text)
1866                                 printf("kssl_err text= %s\n", kssl_err.text);
1867 #endif  /* KSSL_DEBUG */
1868                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1869                                 kssl_err.reason);
1870                         goto err;
1871                         }
1872
1873                 /*  Note: no authenticator is not considered an error,
1874                 **  but will return authtime == 0.
1875                 */
1876                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
1877                                         &authtime, &kssl_err)) != 0)
1878                         {
1879 #ifdef KSSL_DEBUG
1880                         printf("kssl_check_authent rtn %d [%d]\n",
1881                                 krb5rc, kssl_err.reason);
1882                         if (kssl_err.text)
1883                                 printf("kssl_err text= %s\n", kssl_err.text);
1884 #endif  /* KSSL_DEBUG */
1885                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1886                                 kssl_err.reason);
1887                         goto err;
1888                         }
1889
1890                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
1891                         {
1892                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, krb5rc);
1893                         goto err;
1894                         }
1895
1896 #ifdef KSSL_DEBUG
1897                 kssl_ctx_show(kssl_ctx);
1898 #endif  /* KSSL_DEBUG */
1899
1900                 enc = kssl_map_enc(kssl_ctx->enctype);
1901                 if (enc == NULL)
1902                     goto err;
1903
1904                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
1905
1906                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
1907                         {
1908                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1909                                 SSL_R_DECRYPTION_FAILED);
1910                         goto err;
1911                         }
1912                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
1913                                         (unsigned char *)enc_pms.data, enc_pms.length))
1914                         {
1915                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1916                                 SSL_R_DECRYPTION_FAILED);
1917                         goto err;
1918                         }
1919                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1920                         {
1921                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1922                                 SSL_R_DATA_LENGTH_TOO_LONG);
1923                         goto err;
1924                         }
1925                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
1926                         {
1927                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1928                                 SSL_R_DECRYPTION_FAILED);
1929                         goto err;
1930                         }
1931                 outl += padl;
1932                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1933                         {
1934                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1935                                 SSL_R_DATA_LENGTH_TOO_LONG);
1936                         goto err;
1937                         }
1938                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1939
1940                 s->session->master_key_length=
1941                         s->method->ssl3_enc->generate_master_secret(s,
1942                                 s->session->master_key, pms, outl);
1943
1944                 if (kssl_ctx->client_princ)
1945                         {
1946                         int len = strlen(kssl_ctx->client_princ);
1947                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
1948                                 {
1949                                 s->session->krb5_client_princ_len = len;
1950                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
1951                                 }
1952                         }
1953
1954
1955                 /*  Was doing kssl_ctx_free() here,
1956                 **  but it caused problems for apache.
1957                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
1958                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
1959                 */
1960                 }
1961         else
1962 #endif  /* OPENSSL_NO_KRB5 */
1963
1964 #ifndef OPENSSL_NO_ECDH
1965                 if ((l & SSL_kECDH) || (l & SSL_kECDHE))
1966                 {
1967                 int ret = 1;
1968                 int field_size = 0;
1969
1970                 /* initialize structures for server's ECDH key pair */
1971                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
1972                         {
1973                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1974                             ERR_R_MALLOC_FAILURE);
1975                         goto err;
1976                         }
1977
1978                 /* Let's get server private key and group information */
1979                 if (l & SSL_kECDH)
1980                         {
1981                         /* use the certificate */
1982                         srvr_ecdh->group = s->cert->key->privatekey-> \
1983                             pkey.eckey->group;
1984                         srvr_ecdh->priv_key = s->cert->key->privatekey-> \
1985                             pkey.eckey->priv_key;
1986                         }
1987                 else
1988                         {
1989                         /* use the ephermeral values we saved when
1990                          * generating the ServerKeyExchange msg.
1991                          */
1992                         srvr_ecdh->group = s->s3->tmp.ecdh->group;
1993                         srvr_ecdh->priv_key = s->s3->tmp.ecdh->priv_key;
1994                         }
1995
1996                 /* Let's get client's public key */
1997                 if ((clnt_ecpoint = EC_POINT_new(srvr_ecdh->group))
1998                     == NULL)
1999                         {
2000                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2001                             ERR_R_MALLOC_FAILURE);
2002                         goto err;
2003                         }
2004
2005                 if (n == 0L)
2006                         {
2007                         /* Client Publickey was in Client Certificate */
2008
2009                          if (l & SSL_kECDHE)
2010                                  {
2011                                  al=SSL_AD_HANDSHAKE_FAILURE;
2012                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2013                                  goto f_err;
2014                                  }
2015                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2016                             == NULL) ||
2017                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2018                                 {
2019                                 /* XXX: For now, we do not support client
2020                                  * authentication using ECDH certificates
2021                                  * so this branch (n == 0L) of the code is
2022                                  * never executed. When that support is
2023                                  * added, we ought to ensure the key
2024                                  * received in the certificate is
2025                                  * authorized for key agreement.
2026                                  * ECDH_compute_key implicitly checks that
2027                                  * the two ECDH shares are for the same
2028                                  * group.
2029                                  */
2030                                 al=SSL_AD_HANDSHAKE_FAILURE;
2031                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2032                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2033                                 goto f_err;
2034                                 }
2035
2036                         EC_POINT_copy(clnt_ecpoint,
2037                             clnt_pub_pkey->pkey.eckey->pub_key);
2038                         ret = 2; /* Skip certificate verify processing */
2039                         }
2040                 else
2041                         {
2042                         /* Get client's public key from encoded point
2043                          * in the ClientKeyExchange message.
2044                          */
2045                         if ((bn_ctx = BN_CTX_new()) == NULL)
2046                                 {
2047                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2048                                     ERR_R_MALLOC_FAILURE);
2049                                 goto err;
2050                                 }
2051
2052                         /* Get encoded point length */
2053                         i = *p;
2054                         p += 1;
2055                         if (EC_POINT_oct2point(srvr_ecdh->group,
2056                             clnt_ecpoint, p, i, bn_ctx) == 0)
2057                                 {
2058                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2059                                     ERR_R_EC_LIB);
2060                                 goto err;
2061                                 }
2062                         /* p is pointing to somewhere in the buffer
2063                          * currently, so set it to the start
2064                          */
2065                         p=(unsigned char *)s->init_buf->data;
2066                         }
2067
2068                 /* Compute the shared pre-master secret */
2069                 field_size = EC_GROUP_get_degree(srvr_ecdh->group);
2070                 if (field_size <= 0)
2071                         {
2072                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2073                                ERR_R_ECDH_LIB);
2074                         goto err;
2075                         }
2076                 /* If field size is not more than 24 octets, then use SHA-1 hash of result;
2077                  * otherwise, use result (see section 4.8 of draft-ietf-tls-ecc-03.txt;
2078                  * this is new with this version of the Internet Draft).
2079                  */
2080                 if (field_size <= 24 * 8)
2081                     i = ECDH_compute_key(p, KDF1_SHA1_len, clnt_ecpoint, srvr_ecdh, KDF1_SHA1);
2082                 else
2083                     i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2084                 if (i <= 0)
2085                         {
2086                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2087                             ERR_R_ECDH_LIB);
2088                         goto err;
2089                         }
2090
2091                 EVP_PKEY_free(clnt_pub_pkey);
2092                 EC_POINT_free(clnt_ecpoint);
2093                 if (srvr_ecdh != NULL)
2094                         {
2095                         srvr_ecdh->priv_key = NULL;
2096                         srvr_ecdh->group = NULL;
2097                         EC_KEY_free(srvr_ecdh);
2098                         }
2099                 BN_CTX_free(bn_ctx);
2100
2101                 /* Compute the master secret */
2102                 s->session->master_key_length = s->method->ssl3_enc-> \
2103                     generate_master_secret(s, s->session->master_key, p, i);
2104
2105                 OPENSSL_cleanse(p, i);
2106                 return (ret);
2107                 }
2108         else
2109 #endif
2110                 {
2111                 al=SSL_AD_HANDSHAKE_FAILURE;
2112                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2113                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2114                 goto f_err;
2115                 }
2116
2117         return(1);
2118 f_err:
2119         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2120 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2121 err:
2122 #endif
2123 #ifndef OPENSSL_NO_ECDH
2124         EVP_PKEY_free(clnt_pub_pkey);
2125         EC_POINT_free(clnt_ecpoint);
2126         if (srvr_ecdh != NULL)
2127                 {
2128                 srvr_ecdh->priv_key = NULL;
2129                 srvr_ecdh->group = NULL;
2130                 EC_KEY_free(srvr_ecdh);
2131                 }
2132         BN_CTX_free(bn_ctx);
2133 #endif
2134         return(-1);
2135         }
2136
2137 static int ssl3_get_cert_verify(SSL *s)
2138         {
2139         EVP_PKEY *pkey=NULL;
2140         unsigned char *p;
2141         int al,ok,ret=0;
2142         long n;
2143         int type=0,i,j;
2144         X509 *peer;
2145
2146         n=ssl3_get_message(s,
2147                 SSL3_ST_SR_CERT_VRFY_A,
2148                 SSL3_ST_SR_CERT_VRFY_B,
2149                 -1,
2150                 514, /* 514? */
2151                 &ok);
2152
2153         if (!ok) return((int)n);
2154
2155         if (s->session->peer != NULL)
2156                 {
2157                 peer=s->session->peer;
2158                 pkey=X509_get_pubkey(peer);
2159                 type=X509_certificate_type(peer,pkey);
2160                 }
2161         else
2162                 {
2163                 peer=NULL;
2164                 pkey=NULL;
2165                 }
2166
2167         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2168                 {
2169                 s->s3->tmp.reuse_message=1;
2170                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2171                         {
2172                         al=SSL_AD_UNEXPECTED_MESSAGE;
2173                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2174                         goto f_err;
2175                         }
2176                 ret=1;
2177                 goto end;
2178                 }
2179
2180         if (peer == NULL)
2181                 {
2182                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2183                 al=SSL_AD_UNEXPECTED_MESSAGE;
2184                 goto f_err;
2185                 }
2186
2187         if (!(type & EVP_PKT_SIGN))
2188                 {
2189                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2190                 al=SSL_AD_ILLEGAL_PARAMETER;
2191                 goto f_err;
2192                 }
2193
2194         if (s->s3->change_cipher_spec)
2195                 {
2196                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2197                 al=SSL_AD_UNEXPECTED_MESSAGE;
2198                 goto f_err;
2199                 }
2200
2201         /* we now have a signature that we need to verify */
2202         p=(unsigned char *)s->init_msg;
2203         n2s(p,i);
2204         n-=2;
2205         if (i > n)
2206                 {
2207                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2208                 al=SSL_AD_DECODE_ERROR;
2209                 goto f_err;
2210                 }
2211
2212         j=EVP_PKEY_size(pkey);
2213         if ((i > j) || (n > j) || (n <= 0))
2214                 {
2215                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2216                 al=SSL_AD_DECODE_ERROR;
2217                 goto f_err;
2218                 }
2219
2220 #ifndef OPENSSL_NO_RSA
2221         if (pkey->type == EVP_PKEY_RSA)
2222                 {
2223                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2224                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
2225                                                         pkey->pkey.rsa);
2226                 if (i < 0)
2227                         {
2228                         al=SSL_AD_DECRYPT_ERROR;
2229                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2230                         goto f_err;
2231                         }
2232                 if (i == 0)
2233                         {
2234                         al=SSL_AD_DECRYPT_ERROR;
2235                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2236                         goto f_err;
2237                         }
2238                 }
2239         else
2240 #endif
2241 #ifndef OPENSSL_NO_DSA
2242                 if (pkey->type == EVP_PKEY_DSA)
2243                 {
2244                 j=DSA_verify(pkey->save_type,
2245                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2246                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2247                 if (j <= 0)
2248                         {
2249                         /* bad signature */
2250                         al=SSL_AD_DECRYPT_ERROR;
2251                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2252                         goto f_err;
2253                         }
2254                 }
2255         else
2256 #endif
2257 #ifndef OPENSSL_NO_ECDSA
2258                 if (pkey->type == EVP_PKEY_EC)
2259                 {
2260                 j=ECDSA_verify(pkey->save_type,
2261                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2262                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.eckey);
2263                 if (j <= 0)
2264                         {
2265                         /* bad signature */
2266                         al=SSL_AD_DECRYPT_ERROR;
2267                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2268                             SSL_R_BAD_ECDSA_SIGNATURE);
2269                         goto f_err;
2270                         }
2271                 }
2272         else
2273 #endif
2274                 {
2275                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2276                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2277                 goto f_err;
2278                 }
2279
2280
2281         ret=1;
2282         if (0)
2283                 {
2284 f_err:
2285                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2286                 }
2287 end:
2288         EVP_PKEY_free(pkey);
2289         return(ret);
2290         }
2291
2292 static int ssl3_get_client_certificate(SSL *s)
2293         {
2294         int i,ok,al,ret= -1;
2295         X509 *x=NULL;
2296         unsigned long l,nc,llen,n;
2297         const unsigned char *p,*q;
2298         unsigned char *d;
2299         STACK_OF(X509) *sk=NULL;
2300
2301         n=ssl3_get_message(s,
2302                 SSL3_ST_SR_CERT_A,
2303                 SSL3_ST_SR_CERT_B,
2304                 -1,
2305                 s->max_cert_list,
2306                 &ok);
2307
2308         if (!ok) return((int)n);
2309
2310         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2311                 {
2312                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2313                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2314                         {
2315                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2316                         al=SSL_AD_HANDSHAKE_FAILURE;
2317                         goto f_err;
2318                         }
2319                 /* If tls asked for a client cert, the client must return a 0 list */
2320                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2321                         {
2322                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2323                         al=SSL_AD_UNEXPECTED_MESSAGE;
2324                         goto f_err;
2325                         }
2326                 s->s3->tmp.reuse_message=1;
2327                 return(1);
2328                 }
2329
2330         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2331                 {
2332                 al=SSL_AD_UNEXPECTED_MESSAGE;
2333                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2334                 goto f_err;
2335                 }
2336         p=d=(unsigned char *)s->init_msg;
2337
2338         if ((sk=sk_X509_new_null()) == NULL)
2339                 {
2340                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2341                 goto err;
2342                 }
2343
2344         n2l3(p,llen);
2345         if (llen+3 != n)
2346                 {
2347                 al=SSL_AD_DECODE_ERROR;
2348                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2349                 goto f_err;
2350                 }
2351         for (nc=0; nc<llen; )
2352                 {
2353                 n2l3(p,l);
2354                 if ((l+nc+3) > llen)
2355                         {
2356                         al=SSL_AD_DECODE_ERROR;
2357                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2358                         goto f_err;
2359                         }
2360
2361                 q=p;
2362                 x=d2i_X509(NULL,&p,l);
2363                 if (x == NULL)
2364                         {
2365                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2366                         goto err;
2367                         }
2368                 if (p != (q+l))
2369                         {
2370                         al=SSL_AD_DECODE_ERROR;
2371                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2372                         goto f_err;
2373                         }
2374                 if (!sk_X509_push(sk,x))
2375                         {
2376                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2377                         goto err;
2378                         }
2379                 x=NULL;
2380                 nc+=l+3;
2381                 }
2382
2383         if (sk_X509_num(sk) <= 0)
2384                 {
2385                 /* TLS does not mind 0 certs returned */
2386                 if (s->version == SSL3_VERSION)
2387                         {
2388                         al=SSL_AD_HANDSHAKE_FAILURE;
2389                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2390                         goto f_err;
2391                         }
2392                 /* Fail for TLS only if we required a certificate */
2393                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2394                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2395                         {
2396                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2397                         al=SSL_AD_HANDSHAKE_FAILURE;
2398                         goto f_err;
2399                         }
2400                 }
2401         else
2402                 {
2403                 i=ssl_verify_cert_chain(s,sk);
2404                 if (!i)
2405                         {
2406                         al=ssl_verify_alarm_type(s->verify_result);
2407                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2408                         goto f_err;
2409                         }
2410                 }
2411
2412         if (s->session->peer != NULL) /* This should not be needed */
2413                 X509_free(s->session->peer);
2414         s->session->peer=sk_X509_shift(sk);
2415         s->session->verify_result = s->verify_result;
2416
2417         /* With the current implementation, sess_cert will always be NULL
2418          * when we arrive here. */
2419         if (s->session->sess_cert == NULL)
2420                 {
2421                 s->session->sess_cert = ssl_sess_cert_new();
2422                 if (s->session->sess_cert == NULL)
2423                         {
2424                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2425                         goto err;
2426                         }
2427                 }
2428         if (s->session->sess_cert->cert_chain != NULL)
2429                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2430         s->session->sess_cert->cert_chain=sk;
2431         /* Inconsistency alert: cert_chain does *not* include the
2432          * peer's own certificate, while we do include it in s3_clnt.c */
2433
2434         sk=NULL;
2435
2436         ret=1;
2437         if (0)
2438                 {
2439 f_err:
2440                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2441                 }
2442 err:
2443         if (x != NULL) X509_free(x);
2444         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2445         return(ret);
2446         }
2447
2448 int ssl3_send_server_certificate(SSL *s)
2449         {
2450         unsigned long l;
2451         X509 *x;
2452
2453         if (s->state == SSL3_ST_SW_CERT_A)
2454                 {
2455                 x=ssl_get_server_send_cert(s);
2456                 if (x == NULL &&
2457                         /* VRS: allow null cert if auth == KRB5 */
2458                         (s->s3->tmp.new_cipher->algorithms
2459                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
2460                         != (SSL_aKRB5|SSL_kKRB5))
2461                         {
2462                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2463                         return(0);
2464                         }
2465
2466                 l=ssl3_output_cert_chain(s,x);
2467                 s->state=SSL3_ST_SW_CERT_B;
2468                 s->init_num=(int)l;
2469                 s->init_off=0;
2470                 }
2471
2472         /* SSL3_ST_SW_CERT_B */
2473         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2474         }
2475
2476
2477 #ifndef OPENSSL_NO_ECDH
2478 /* This is the complement of curve_id2nid in s3_clnt.c. */
2479 static int nid2curve_id(int nid)
2480 {
2481         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2482          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2483         switch (nid) {
2484         case NID_sect163k1: /* sect163k1 (1) */
2485                 return 1;
2486         case NID_sect163r1: /* sect163r1 (2) */
2487                 return 2;
2488         case NID_sect163r2: /* sect163r2 (3) */
2489                 return 3;
2490         case NID_sect193r1: /* sect193r1 (4) */
2491                 return 4;
2492         case NID_sect193r2: /* sect193r2 (5) */
2493                 return 5;
2494         case NID_sect233k1: /* sect233k1 (6) */
2495                 return 6;
2496         case NID_sect233r1: /* sect233r1 (7) */
2497                 return 7;
2498         case NID_sect239k1: /* sect239k1 (8) */
2499                 return 8;
2500         case NID_sect283k1: /* sect283k1 (9) */
2501                 return 9;
2502         case NID_sect283r1: /* sect283r1 (10) */
2503                 return 10;
2504         case NID_sect409k1: /* sect409k1 (11) */
2505                 return 11;
2506         case NID_sect409r1: /* sect409r1 (12) */
2507                 return 12;
2508         case NID_sect571k1: /* sect571k1 (13) */
2509                 return 13;
2510         case NID_sect571r1: /* sect571r1 (14) */
2511                 return 14;
2512         case NID_secp160k1: /* secp160k1 (15) */
2513                 return 15;
2514         case NID_secp160r1: /* secp160r1 (16) */
2515                 return 16;
2516         case NID_secp160r2: /* secp160r2 (17) */
2517                 return 17;
2518         case NID_secp192k1: /* secp192k1 (18) */
2519                 return 18;
2520         case NID_X9_62_prime192v1: /* secp192r1 (19) */
2521                 return 19;
2522         case NID_secp224k1: /* secp224k1 (20) */
2523                 return 20;
2524         case NID_secp224r1: /* secp224r1 (21) */
2525                 return 21;
2526         case NID_secp256k1: /* secp256k1 (22) */
2527                 return 22;
2528         case NID_X9_62_prime256v1: /* secp256r1 (23) */
2529                 return 23;
2530         case NID_secp384r1: /* secp384r1 (24) */
2531                 return 24;
2532         case NID_secp521r1:  /* secp521r1 (25) */
2533                 return 25;
2534         default:
2535                 return 0;
2536         }
2537 }
2538 #endif