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 #include <openssl/dh.h>
 137 #include <openssl/bn.h>
 138 #ifndef OPENSSL_NO_KRB5
 139 #include <openssl/krb5_asn.h>
 140 #endif
 141 #include <openssl/md5.h>
 142
 143 static SSL_METHOD *ssl3_get_server_method(int ver);
 144 static int ssl3_get_client_hello(SSL *s);
 145 static int ssl3_check_client_hello(SSL *s);
 146 static int ssl3_send_server_hello(SSL *s);
 147 static int ssl3_send_server_key_exchange(SSL *s);
 148 static int ssl3_send_certificate_request(SSL *s);
 149 static int ssl3_send_server_done(SSL *s);
 150 static int ssl3_get_client_key_exchange(SSL *s);
 151 static int ssl3_get_client_certificate(SSL *s);
 152 static int ssl3_get_cert_verify(SSL *s);
 153 static int ssl3_send_hello_request(SSL *s);
 154
 155 #ifndef OPENSSL_NO_ECDH
 156 static int nid2curve_id(int nid);
 157 #endif
 158
 159 static SSL_METHOD *ssl3_get_server_method(int ver)
 160         {
 161         if (ver == SSL3_VERSION)
 162                 return(SSLv3_server_method());
 163         else
 164                 return(NULL);
 165         }
 166
 167 SSL_METHOD *SSLv3_server_method(void)
 168         {
 169         static int init=1;
 170         static SSL_METHOD SSLv3_server_data;
 171
 172         if (init)
 173                 {
 174                 CRYPTO_w_lock(CRYPTO_LOCK_SSL_METHOD);
 175
 176                 if (init)
 177                         {
 178                         memcpy((char *)&SSLv3_server_data,(char *)sslv3_base_method(),
 179                                 sizeof(SSL_METHOD));
 180                         SSLv3_server_data.ssl_accept=ssl3_accept;
 181                         SSLv3_server_data.get_ssl_method=ssl3_get_server_method;
 182                         init=0;
 183                         }
 184
 185                 CRYPTO_w_unlock(CRYPTO_LOCK_SSL_METHOD);
 186                 }
 187         return(&SSLv3_server_data);
 188         }
 189
 190 int ssl3_accept(SSL *s)
 191         {
 192         BUF_MEM *buf;
 193         unsigned long l,Time=time(NULL);
 194         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 195         long num1;
 196         int ret= -1;
 197         int new_state,state,skip=0;
 198
 199         RAND_add(&Time,sizeof(Time),0);
 200         ERR_clear_error();
 201         clear_sys_error();
 202
 203         if (s->info_callback != NULL)
 204                 cb=s->info_callback;
 205         else if (s->ctx->info_callback != NULL)
 206                 cb=s->ctx->info_callback;
 207
 208         /* init things to blank */
 209         s->in_handshake++;
 210         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 211
 212         if (s->cert == NULL)
 213                 {
 214                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 215                 return(-1);
 216                 }
 217
 218         for (;;)
 219                 {
 220                 state=s->state;
 221
 222                 switch (s->state)
 223                         {
 224                 case SSL_ST_RENEGOTIATE:
 225                         s->new_session=1;
 226                         /* s->state=SSL_ST_ACCEPT; */
 227
 228                 case SSL_ST_BEFORE:
 229                 case SSL_ST_ACCEPT:
 230                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 231                 case SSL_ST_OK|SSL_ST_ACCEPT:
 232
 233                         s->server=1;
 234                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 235
 236                         if ((s->version>>8) != 3)
 237                                 {
 238                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 239                                 return -1;
 240                                 }
 241                         s->type=SSL_ST_ACCEPT;
 242
 243                         if (s->init_buf == NULL)
 244                                 {
 245                                 if ((buf=BUF_MEM_new()) == NULL)
 246                                         {
 247                                         ret= -1;
 248                                         goto end;
 249                                         }
 250                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 251                                         {
 252                                         ret= -1;
 253                                         goto end;
 254                                         }
 255                                 s->init_buf=buf;
 256                                 }
 257
 258                         if (!ssl3_setup_buffers(s))
 259                                 {
 260                                 ret= -1;
 261                                 goto end;
 262                                 }
 263
 264                         s->init_num=0;
 265
 266                         if (s->state != SSL_ST_RENEGOTIATE)
 267                                 {
 268                                 /* Ok, we now need to push on a buffering BIO so that
 269                                  * the output is sent in a way that TCP likes :-)
 270                                  */
 271                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 272
 273                                 ssl3_init_finished_mac(s);
 274                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 275                                 s->ctx->stats.sess_accept++;
 276                                 }
 277                         else
 278                                 {
 279                                 /* s->state == SSL_ST_RENEGOTIATE,
 280                                  * we will just send a HelloRequest */
 281                                 s->ctx->stats.sess_accept_renegotiate++;
 282                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 283                                 }
 284                         break;
 285
 286                 case SSL3_ST_SW_HELLO_REQ_A:
 287                 case SSL3_ST_SW_HELLO_REQ_B:
 288
 289                         s->shutdown=0;
 290                         ret=ssl3_send_hello_request(s);
 291                         if (ret <= 0) goto end;
 292                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 293                         s->state=SSL3_ST_SW_FLUSH;
 294                         s->init_num=0;
 295
 296                         ssl3_init_finished_mac(s);
 297                         break;
 298
 299                 case SSL3_ST_SW_HELLO_REQ_C:
 300                         s->state=SSL_ST_OK;
 301                         break;
 302
 303                 case SSL3_ST_SR_CLNT_HELLO_A:
 304                 case SSL3_ST_SR_CLNT_HELLO_B:
 305                 case SSL3_ST_SR_CLNT_HELLO_C:
 306
 307                         s->shutdown=0;
 308                         ret=ssl3_get_client_hello(s);
 309                         if (ret <= 0) goto end;
 310                         s->new_session = 2;
 311                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 312                         s->init_num=0;
 313                         break;
 314
 315                 case SSL3_ST_SW_SRVR_HELLO_A:
 316                 case SSL3_ST_SW_SRVR_HELLO_B:
 317                         ret=ssl3_send_server_hello(s);
 318                         if (ret <= 0) goto end;
 319
 320                         if (s->hit)
 321                                 s->state=SSL3_ST_SW_CHANGE_A;
 322                         else
 323                                 s->state=SSL3_ST_SW_CERT_A;
 324                         s->init_num=0;
 325                         break;
 326
 327                 case SSL3_ST_SW_CERT_A:
 328                 case SSL3_ST_SW_CERT_B:
 329                         /* Check if it is anon DH or anon ECDH */
 330                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 331                                 {
 332                                 ret=ssl3_send_server_certificate(s);
 333                                 if (ret <= 0) goto end;
 334                                 }
 335                         else
 336                                 skip=1;
 337                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 338                         s->init_num=0;
 339                         break;
 340
 341                 case SSL3_ST_SW_KEY_EXCH_A:
 342                 case SSL3_ST_SW_KEY_EXCH_B:
 343                         l=s->s3->tmp.new_cipher->algorithms;
 344
 345                         /* clear this, it may get reset by
 346                          * send_server_key_exchange */
 347                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 348 #ifndef OPENSSL_NO_KRB5
 349                                 && !(l & SSL_KRB5)
 350 #endif /* OPENSSL_NO_KRB5 */
 351                                 )
 352                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 353                                  * even when forbidden by protocol specs
 354                                  * (handshake may fail as clients are not required to
 355                                  * be able to handle this) */
 356                                 s->s3->tmp.use_rsa_tmp=1;
 357                         else
 358                                 s->s3->tmp.use_rsa_tmp=0;
 359
 360
 361                         /* only send if a DH key exchange, fortezza or
 362                          * RSA but we have a sign only certificate
 363                          *
 364                          * For ECC ciphersuites, we send a serverKeyExchange
 365                          * message only if the cipher suite is either
 366                          * ECDH-anon or ECDHE. In other cases, the
 367                          * server certificate contains the server's
 368                          * public key for key exchange.
 369                          */
 370                         if (s->s3->tmp.use_rsa_tmp
 371                             || (l & SSL_kECDHE)
 372                             || (l & (SSL_DH|SSL_kFZA))
 373                             || ((l & SSL_kRSA)
 374                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 375                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 376                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 377                                         )
 378                                     )
 379                                 )
 380                             )
 381                                 {
 382                                 ret=ssl3_send_server_key_exchange(s);
 383                                 if (ret <= 0) goto end;
 384                                 }
 385                         else
 386                                 skip=1;
 387
 388                         s->state=SSL3_ST_SW_CERT_REQ_A;
 389                         s->init_num=0;
 390                         break;
 391
 392                 case SSL3_ST_SW_CERT_REQ_A:
 393                 case SSL3_ST_SW_CERT_REQ_B:
 394                         if (/* don't request cert unless asked for it: */
 395                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 396                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 397                                  * don't request cert during re-negotiation: */
 398                                 ((s->session->peer != NULL) &&
 399                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 400                                 /* never request cert in anonymous ciphersuites
 401                                  * (see section "Certificate request" in SSL 3 drafts
 402                                  * and in RFC 2246): */
 403                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 404                                  /* ... except when the application insists on verification
 405                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 406                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 407                                  /* never request cert in Kerberos ciphersuites */
 408                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 409                                 {
 410                                 /* no cert request */
 411                                 skip=1;
 412                                 s->s3->tmp.cert_request=0;
 413                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 414                                 }
 415                         else
 416                                 {
 417                                 s->s3->tmp.cert_request=1;
 418                                 ret=ssl3_send_certificate_request(s);
 419                                 if (ret <= 0) goto end;
 420 #ifndef NETSCAPE_HANG_BUG
 421                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 422 #else
 423                                 s->state=SSL3_ST_SW_FLUSH;
 424                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 425 #endif
 426                                 s->init_num=0;
 427                                 }
 428                         break;
 429
 430                 case SSL3_ST_SW_SRVR_DONE_A:
 431                 case SSL3_ST_SW_SRVR_DONE_B:
 432                         ret=ssl3_send_server_done(s);
 433                         if (ret <= 0) goto end;
 434                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 435                         s->state=SSL3_ST_SW_FLUSH;
 436                         s->init_num=0;
 437                         break;
 438
 439                 case SSL3_ST_SW_FLUSH:
 440                         /* number of bytes to be flushed */
 441                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 442                         if (num1 > 0)
 443                                 {
 444                                 s->rwstate=SSL_WRITING;
 445                                 num1=BIO_flush(s->wbio);
 446                                 if (num1 <= 0) { ret= -1; goto end; }
 447                                 s->rwstate=SSL_NOTHING;
 448                                 }
 449
 450                         s->state=s->s3->tmp.next_state;
 451                         break;
 452
 453                 case SSL3_ST_SR_CERT_A:
 454                 case SSL3_ST_SR_CERT_B:
 455                         /* Check for second client hello (MS SGC) */
 456                         ret = ssl3_check_client_hello(s);
 457                         if (ret <= 0)
 458                                 goto end;
 459                         if (ret == 2)
 460                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 461                         else {
 462                                 if (s->s3->tmp.cert_request)
 463                                         {
 464                                         ret=ssl3_get_client_certificate(s);
 465                                         if (ret <= 0) goto end;
 466                                         }
 467                                 s->init_num=0;
 468                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 469                         }
 470                         break;
 471
 472                 case SSL3_ST_SR_KEY_EXCH_A:
 473                 case SSL3_ST_SR_KEY_EXCH_B:
 474                         ret=ssl3_get_client_key_exchange(s);
 475                         if (ret <= 0)
 476                                 goto end;
 477                         if (ret == 2)
 478                                 {
 479                                 /* For the ECDH ciphersuites when
 480                                  * the client sends its ECDH pub key in
 481                                  * a certificate, the CertificateVerify
 482                                  * message is not sent.
 483                                  */
 484                                 s->state=SSL3_ST_SR_FINISHED_A;
 485                                 s->init_num = 0;
 486                                 }
 487                         else
 488                                 {
 489                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 490                                 s->init_num=0;
 491
 492                                 /* We need to get hashes here so if there is
 493                                  * a client cert, it can be verified
 494                                  */
 495                                 s->method->ssl3_enc->cert_verify_mac(s,
 496                                     &(s->s3->finish_dgst1),
 497                                     &(s->s3->tmp.cert_verify_md[0]));
 498                                 s->method->ssl3_enc->cert_verify_mac(s,
 499                                     &(s->s3->finish_dgst2),
 500                                     &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 501                                 }
 502                         break;
 503
 504                 case SSL3_ST_SR_CERT_VRFY_A:
 505                 case SSL3_ST_SR_CERT_VRFY_B:
 506
 507                         /* we should decide if we expected this one */
 508                         ret=ssl3_get_cert_verify(s);
 509                         if (ret <= 0) goto end;
 510
 511                         s->state=SSL3_ST_SR_FINISHED_A;
 512                         s->init_num=0;
 513                         break;
 514
 515                 case SSL3_ST_SR_FINISHED_A:
 516                 case SSL3_ST_SR_FINISHED_B:
 517                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 518                                 SSL3_ST_SR_FINISHED_B);
 519                         if (ret <= 0) goto end;
 520                         if (s->hit)
 521                                 s->state=SSL_ST_OK;
 522                         else
 523                                 s->state=SSL3_ST_SW_CHANGE_A;
 524                         s->init_num=0;
 525                         break;
 526
 527                 case SSL3_ST_SW_CHANGE_A:
 528                 case SSL3_ST_SW_CHANGE_B:
 529
 530                         s->session->cipher=s->s3->tmp.new_cipher;
 531                         if (!s->method->ssl3_enc->setup_key_block(s))
 532                                 { ret= -1; goto end; }
 533
 534                         ret=ssl3_send_change_cipher_spec(s,
 535                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 536
 537                         if (ret <= 0) goto end;
 538                         s->state=SSL3_ST_SW_FINISHED_A;
 539                         s->init_num=0;
 540
 541                         if (!s->method->ssl3_enc->change_cipher_state(s,
 542                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 543                                 {
 544                                 ret= -1;
 545                                 goto end;
 546                                 }
 547
 548                         break;
 549
 550                 case SSL3_ST_SW_FINISHED_A:
 551                 case SSL3_ST_SW_FINISHED_B:
 552                         ret=ssl3_send_finished(s,
 553                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 554                                 s->method->ssl3_enc->server_finished_label,
 555                                 s->method->ssl3_enc->server_finished_label_len);
 556                         if (ret <= 0) goto end;
 557                         s->state=SSL3_ST_SW_FLUSH;
 558                         if (s->hit)
 559                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 560                         else
 561                                 s->s3->tmp.next_state=SSL_ST_OK;
 562                         s->init_num=0;
 563                         break;
 564
 565                 case SSL_ST_OK:
 566                         /* clean a few things up */
 567                         ssl3_cleanup_key_block(s);
 568
 569                         BUF_MEM_free(s->init_buf);
 570                         s->init_buf=NULL;
 571
 572                         /* remove buffering on output */
 573                         ssl_free_wbio_buffer(s);
 574
 575                         s->init_num=0;
 576
 577                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 578                                 {
 579                                 /* actually not necessarily a 'new' session unless
 580                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 581
 582                                 s->new_session=0;
 583
 584                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 585
 586                                 s->ctx->stats.sess_accept_good++;
 587                                 /* s->server=1; */
 588                                 s->handshake_func=ssl3_accept;
 589
 590                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 591                                 }
 592
 593                         ret = 1;
 594                         goto end;
 595                         /* break; */
 596
 597                 default:
 598                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 599                         ret= -1;
 600                         goto end;
 601                         /* break; */
 602                         }
 603
 604                 if (!s->s3->tmp.reuse_message && !skip)
 605                         {
 606                         if (s->debug)
 607                                 {
 608                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 609                                         goto end;
 610                                 }
 611
 612
 613                         if ((cb != NULL) && (s->state != state))
 614                                 {
 615                                 new_state=s->state;
 616                                 s->state=state;
 617                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 618                                 s->state=new_state;
 619                                 }
 620                         }
 621                 skip=0;
 622                 }
 623 end:
 624         /* BIO_flush(s->wbio); */
 625
 626         s->in_handshake--;
 627         if (cb != NULL)
 628                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 629         return(ret);
 630         }
 631
 632 static int ssl3_send_hello_request(SSL *s)
 633         {
 634         unsigned char *p;
 635
 636         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 637                 {
 638                 p=(unsigned char *)s->init_buf->data;
 639                 *(p++)=SSL3_MT_HELLO_REQUEST;
 640                 *(p++)=0;
 641                 *(p++)=0;
 642                 *(p++)=0;
 643
 644                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 645                 /* number of bytes to write */
 646                 s->init_num=4;
 647                 s->init_off=0;
 648                 }
 649
 650         /* SSL3_ST_SW_HELLO_REQ_B */
 651         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 652         }
 653
 654 static int ssl3_check_client_hello(SSL *s)
 655         {
 656         int ok;
 657         long n;
 658
 659         /* this function is called when we really expect a Certificate message,
 660          * so permit appropriate message length */
 661         n=ssl3_get_message(s,
 662                 SSL3_ST_SR_CERT_A,
 663                 SSL3_ST_SR_CERT_B,
 664                 -1,
 665                 s->max_cert_list,
 666                 &ok);
 667         if (!ok) return((int)n);
 668         s->s3->tmp.reuse_message = 1;
 669         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 670                 {
 671                 /* Throw away what we have done so far in the current handshake,
 672                  * which will now be aborted. (A full SSL_clear would be too much.)
 673                  * I hope that tmp.dh is the only thing that may need to be cleared
 674                  * when a handshake is not completed ... */
 675 #ifndef OPENSSL_NO_DH
 676                 if (s->s3->tmp.dh != NULL)
 677                         {
 678                         DH_free(s->s3->tmp.dh);
 679                         s->s3->tmp.dh = NULL;
 680                         }
 681 #endif
 682                 return 2;
 683                 }
 684         return 1;
 685 }
 686
 687 static int ssl3_get_client_hello(SSL *s)
 688         {
 689         int i,j,ok,al,ret= -1;
 690         long n;
 691         unsigned long id;
 692         unsigned char *p,*d,*q;
 693         SSL_CIPHER *c;
 694         SSL_COMP *comp=NULL;
 695         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 696
 697         /* We do this so that we will respond with our native type.
 698          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 699          * This down switching should be handled by a different method.
 700          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 701          * TLSv1.
 702          */
 703         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 704                 {
 705                 s->first_packet=1;
 706                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 707                 }
 708         n=ssl3_get_message(s,
 709                 SSL3_ST_SR_CLNT_HELLO_B,
 710                 SSL3_ST_SR_CLNT_HELLO_C,
 711                 SSL3_MT_CLIENT_HELLO,
 712                 SSL3_RT_MAX_PLAIN_LENGTH,
 713                 &ok);
 714
 715         if (!ok) return((int)n);
 716         d=p=(unsigned char *)s->init_msg;
 717
 718         /* use version from inside client hello, not from record header
 719          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 720         s->client_version=(((int)p[0])<<8)|(int)p[1];
 721         p+=2;
 722
 723         if (s->client_version < s->version)
 724                 {
 725                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 726                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 727                         {
 728                         /* similar to ssl3_get_record, send alert using remote version number */
 729                         s->version = s->client_version;
 730                         }
 731                 al = SSL_AD_PROTOCOL_VERSION;
 732                 goto f_err;
 733                 }
 734
 735         /* load the client random */
 736         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 737         p+=SSL3_RANDOM_SIZE;
 738
 739         /* get the session-id */
 740         j= *(p++);
 741
 742         s->hit=0;
 743         /* Versions before 0.9.7 always allow session reuse during renegotiation
 744          * (i.e. when s->new_session is true), option
 745          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
 746          * Maybe this optional behaviour should always have been the default,
 747          * but we cannot safely change the default behaviour (or new applications
 748          * might be written that become totally unsecure when compiled with
 749          * an earlier library version)
 750          */
 751         if (j == 0 || (s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 752                 {
 753                 if (!ssl_get_new_session(s,1))
 754                         goto err;
 755                 }
 756         else
 757                 {
 758                 i=ssl_get_prev_session(s,p,j);
 759                 if (i == 1)
 760                         { /* previous session */
 761                         s->hit=1;
 762                         }
 763                 else if (i == -1)
 764                         goto err;
 765                 else /* i == 0 */
 766                         {
 767                         if (!ssl_get_new_session(s,1))
 768                                 goto err;
 769                         }
 770                 }
 771
 772         p+=j;
 773         n2s(p,i);
 774         if ((i == 0) && (j != 0))
 775                 {
 776                 /* we need a cipher if we are not resuming a session */
 777                 al=SSL_AD_ILLEGAL_PARAMETER;
 778                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 779                 goto f_err;
 780                 }
 781         if ((p+i) >= (d+n))
 782                 {
 783                 /* not enough data */
 784                 al=SSL_AD_DECODE_ERROR;
 785                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 786                 goto f_err;
 787                 }
 788         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 789                 == NULL))
 790                 {
 791                 goto err;
 792                 }
 793         p+=i;
 794
 795         /* If it is a hit, check that the cipher is in the list */
 796         if ((s->hit) && (i > 0))
 797                 {
 798                 j=0;
 799                 id=s->session->cipher->id;
 800
 801 #ifdef CIPHER_DEBUG
 802                 printf("client sent %d ciphers\n",sk_num(ciphers));
 803 #endif
 804                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 805                         {
 806                         c=sk_SSL_CIPHER_value(ciphers,i);
 807 #ifdef CIPHER_DEBUG
 808                         printf("client [%2d of %2d]:%s\n",
 809                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 810 #endif
 811                         if (c->id == id)
 812                                 {
 813                                 j=1;
 814                                 break;
 815                                 }
 816                         }
 817                 if (j == 0)
 818                         {
 819                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 820                                 {
 821                                 /* Very bad for multi-threading.... */
 822                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers,
 823                                                                        0);
 824                                 }
 825                         else
 826                                 {
 827                                 /* we need to have the cipher in the cipher
 828                                  * list if we are asked to reuse it */
 829                                 al=SSL_AD_ILLEGAL_PARAMETER;
 830                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 831                                 goto f_err;
 832                                 }
 833                         }
 834                 }
 835
 836         /* compression */
 837         i= *(p++);
 838         if ((p+i) > (d+n))
 839                 {
 840                 /* not enough data */
 841                 al=SSL_AD_DECODE_ERROR;
 842                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 843                 goto f_err;
 844                 }
 845         q=p;
 846         for (j=0; j<i; j++)
 847                 {
 848                 if (p[j] == 0) break;
 849                 }
 850
 851         p+=i;
 852         if (j >= i)
 853                 {
 854                 /* no compress */
 855                 al=SSL_AD_DECODE_ERROR;
 856                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 857                 goto f_err;
 858                 }
 859
 860         /* Worst case, we will use the NULL compression, but if we have other
 861          * options, we will now look for them.  We have i-1 compression
 862          * algorithms from the client, starting at q. */
 863         s->s3->tmp.new_compression=NULL;
 864         if (s->ctx->comp_methods != NULL)
 865                 { /* See if we have a match */
 866                 int m,nn,o,v,done=0;
 867
 868                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
 869                 for (m=0; m<nn; m++)
 870                         {
 871                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
 872                         v=comp->id;
 873                         for (o=0; o<i; o++)
 874                                 {
 875                                 if (v == q[o])
 876                                         {
 877                                         done=1;
 878                                         break;
 879                                         }
 880                                 }
 881                         if (done) break;
 882                         }
 883                 if (done)
 884                         s->s3->tmp.new_compression=comp;
 885                 else
 886                         comp=NULL;
 887                 }
 888
 889         /* TLS does not mind if there is extra stuff */
 890 #if 0   /* SSL 3.0 does not mind either, so we should disable this test
 891          * (was enabled in 0.9.6d through 0.9.6j and 0.9.7 through 0.9.7b,
 892          * in earlier SSLeay/OpenSSL releases this test existed but was buggy) */
 893         if (s->version == SSL3_VERSION)
 894                 {
 895                 if (p < (d+n))
 896                         {
 897                         /* wrong number of bytes,
 898                          * there could be more to follow */
 899                         al=SSL_AD_DECODE_ERROR;
 900                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 901                         goto f_err;
 902                         }
 903                 }
 904 #endif
 905
 906         /* Given s->session->ciphers and SSL_get_ciphers, we must
 907          * pick a cipher */
 908
 909         if (!s->hit)
 910                 {
 911                 s->session->compress_meth=(comp == NULL)?0:comp->id;
 912                 if (s->session->ciphers != NULL)
 913                         sk_SSL_CIPHER_free(s->session->ciphers);
 914                 s->session->ciphers=ciphers;
 915                 if (ciphers == NULL)
 916                         {
 917                         al=SSL_AD_ILLEGAL_PARAMETER;
 918                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
 919                         goto f_err;
 920                         }
 921                 ciphers=NULL;
 922                 c=ssl3_choose_cipher(s,s->session->ciphers,
 923                                      SSL_get_ciphers(s));
 924
 925                 if (c == NULL)
 926                         {
 927                         al=SSL_AD_HANDSHAKE_FAILURE;
 928                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
 929                         goto f_err;
 930                         }
 931                 s->s3->tmp.new_cipher=c;
 932                 }
 933         else
 934                 {
 935                 /* Session-id reuse */
 936 #ifdef REUSE_CIPHER_BUG
 937                 STACK_OF(SSL_CIPHER) *sk;
 938                 SSL_CIPHER *nc=NULL;
 939                 SSL_CIPHER *ec=NULL;
 940
 941                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
 942                         {
 943                         sk=s->session->ciphers;
 944                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
 945                                 {
 946                                 c=sk_SSL_CIPHER_value(sk,i);
 947                                 if (c->algorithms & SSL_eNULL)
 948                                         nc=c;
 949                                 if (SSL_C_IS_EXPORT(c))
 950                                         ec=c;
 951                                 }
 952                         if (nc != NULL)
 953                                 s->s3->tmp.new_cipher=nc;
 954                         else if (ec != NULL)
 955                                 s->s3->tmp.new_cipher=ec;
 956                         else
 957                                 s->s3->tmp.new_cipher=s->session->cipher;
 958                         }
 959                 else
 960 #endif
 961                 s->s3->tmp.new_cipher=s->session->cipher;
 962                 }
 963
 964         /* we now have the following setup.
 965          * client_random
 966          * cipher_list          - our prefered list of ciphers
 967          * ciphers              - the clients prefered list of ciphers
 968          * compression          - basically ignored right now
 969          * ssl version is set   - sslv3
 970          * s->session           - The ssl session has been setup.
 971          * s->hit               - session reuse flag
 972          * s->tmp.new_cipher    - the new cipher to use.
 973          */
 974
 975         ret=1;
 976         if (0)
 977                 {
 978 f_err:
 979                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
 980                 }
 981 err:
 982         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
 983         return(ret);
 984         }
 985
 986 static int ssl3_send_server_hello(SSL *s)
 987         {
 988         unsigned char *buf;
 989         unsigned char *p,*d;
 990         int i,sl;
 991         unsigned long l,Time;
 992
 993         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
 994                 {
 995                 buf=(unsigned char *)s->init_buf->data;
 996                 p=s->s3->server_random;
 997                 Time=time(NULL);                        /* Time */
 998                 l2n(Time,p);
 999                 RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4);
1000                 /* Do the message type and length last */
1001                 d=p= &(buf[4]);
1002
1003                 *(p++)=s->version>>8;
1004                 *(p++)=s->version&0xff;
1005
1006                 /* Random stuff */
1007                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1008                 p+=SSL3_RANDOM_SIZE;
1009
1010                 /* now in theory we have 3 options to sending back the
1011                  * session id.  If it is a re-use, we send back the
1012                  * old session-id, if it is a new session, we send
1013                  * back the new session-id or we send back a 0 length
1014                  * session-id if we want it to be single use.
1015                  * Currently I will not implement the '0' length session-id
1016                  * 12-Jan-98 - I'll now support the '0' length stuff.
1017                  */
1018                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER))
1019                         s->session->session_id_length=0;
1020
1021                 sl=s->session->session_id_length;
1022                 if (sl > (int)sizeof(s->session->session_id))
1023                         {
1024                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1025                         return -1;
1026                         }
1027                 *(p++)=sl;
1028                 memcpy(p,s->session->session_id,sl);
1029                 p+=sl;
1030
1031                 /* put the cipher */
1032                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1033                 p+=i;
1034
1035                 /* put the compression method */
1036                 if (s->s3->tmp.new_compression == NULL)
1037                         *(p++)=0;
1038                 else
1039                         *(p++)=s->s3->tmp.new_compression->id;
1040
1041                 /* do the header */
1042                 l=(p-d);
1043                 d=buf;
1044                 *(d++)=SSL3_MT_SERVER_HELLO;
1045                 l2n3(l,d);
1046
1047                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
1048                 /* number of bytes to write */
1049                 s->init_num=p-buf;
1050                 s->init_off=0;
1051                 }
1052
1053         /* SSL3_ST_CW_CLNT_HELLO_B */
1054         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1055         }
1056
1057 static int ssl3_send_server_done(SSL *s)
1058         {
1059         unsigned char *p;
1060
1061         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1062                 {
1063                 p=(unsigned char *)s->init_buf->data;
1064
1065                 /* do the header */
1066                 *(p++)=SSL3_MT_SERVER_DONE;
1067                 *(p++)=0;
1068                 *(p++)=0;
1069                 *(p++)=0;
1070
1071                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1072                 /* number of bytes to write */
1073                 s->init_num=4;
1074                 s->init_off=0;
1075                 }
1076
1077         /* SSL3_ST_CW_CLNT_HELLO_B */
1078         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1079         }
1080
1081 static int ssl3_send_server_key_exchange(SSL *s)
1082         {
1083 #ifndef OPENSSL_NO_RSA
1084         unsigned char *q;
1085         int j,num;
1086         RSA *rsa;
1087         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1088         unsigned int u;
1089 #endif
1090 #ifndef OPENSSL_NO_DH
1091         DH *dh=NULL,*dhp;
1092 #endif
1093 #ifndef OPENSSL_NO_ECDH
1094         EC_KEY *ecdh=NULL, *ecdhp;
1095         unsigned char *encodedPoint = NULL;
1096         int encodedlen = 0;
1097         int curve_id = 0;
1098         BN_CTX *bn_ctx = NULL;
1099 #endif
1100         EVP_PKEY *pkey;
1101         unsigned char *p,*d;
1102         int al,i;
1103         unsigned long type;
1104         int n;
1105         CERT *cert;
1106         BIGNUM *r[4];
1107         int nr[4],kn;
1108         BUF_MEM *buf;
1109         EVP_MD_CTX md_ctx;
1110
1111         EVP_MD_CTX_init(&md_ctx);
1112         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1113                 {
1114                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1115                 cert=s->cert;
1116
1117                 buf=s->init_buf;
1118
1119                 r[0]=r[1]=r[2]=r[3]=NULL;
1120                 n=0;
1121 #ifndef OPENSSL_NO_RSA
1122                 if (type & SSL_kRSA)
1123                         {
1124                         rsa=cert->rsa_tmp;
1125                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1126                                 {
1127                                 rsa=s->cert->rsa_tmp_cb(s,
1128                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1129                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1130                                 if(rsa == NULL)
1131                                 {
1132                                         al=SSL_AD_HANDSHAKE_FAILURE;
1133                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1134                                         goto f_err;
1135                                 }
1136                                 RSA_up_ref(rsa);
1137                                 cert->rsa_tmp=rsa;
1138                                 }
1139                         if (rsa == NULL)
1140                                 {
1141                                 al=SSL_AD_HANDSHAKE_FAILURE;
1142                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1143                                 goto f_err;
1144                                 }
1145                         r[0]=rsa->n;
1146                         r[1]=rsa->e;
1147                         s->s3->tmp.use_rsa_tmp=1;
1148                         }
1149                 else
1150 #endif
1151 #ifndef OPENSSL_NO_DH
1152                         if (type & SSL_kEDH)
1153                         {
1154                         dhp=cert->dh_tmp;
1155                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1156                                 dhp=s->cert->dh_tmp_cb(s,
1157                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1158                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1159                         if (dhp == NULL)
1160                                 {
1161                                 al=SSL_AD_HANDSHAKE_FAILURE;
1162                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1163                                 goto f_err;
1164                                 }
1165
1166                         if (s->s3->tmp.dh != NULL)
1167                                 {
1168                                 DH_free(dh);
1169                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1170                                 goto err;
1171                                 }
1172
1173                         if ((dh=DHparams_dup(dhp)) == NULL)
1174                                 {
1175                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1176                                 goto err;
1177                                 }
1178
1179                         s->s3->tmp.dh=dh;
1180                         if ((dhp->pub_key == NULL ||
1181                              dhp->priv_key == NULL ||
1182                              (s->options & SSL_OP_SINGLE_DH_USE)))
1183                                 {
1184                                 if(!DH_generate_key(dh))
1185                                     {
1186                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1187                                            ERR_R_DH_LIB);
1188                                     goto err;
1189                                     }
1190                                 }
1191                         else
1192                                 {
1193                                 dh->pub_key=BN_dup(dhp->pub_key);
1194                                 dh->priv_key=BN_dup(dhp->priv_key);
1195                                 if ((dh->pub_key == NULL) ||
1196                                         (dh->priv_key == NULL))
1197                                         {
1198                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1199                                         goto err;
1200                                         }
1201                                 }
1202                         r[0]=dh->p;
1203                         r[1]=dh->g;
1204                         r[2]=dh->pub_key;
1205                         }
1206                 else
1207 #endif
1208 #ifndef OPENSSL_NO_ECDH
1209                         if (type & SSL_kECDHE)
1210                         {
1211                         ecdhp=cert->ecdh_tmp;
1212                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1213                                 {
1214                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1215                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1216                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1217                                 }
1218                         if (ecdhp == NULL)
1219                                 {
1220                                 al=SSL_AD_HANDSHAKE_FAILURE;
1221                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1222                                 goto f_err;
1223                                 }
1224
1225                         if (s->s3->tmp.ecdh != NULL)
1226                                 {
1227                                 EC_KEY_free(s->s3->tmp.ecdh);
1228                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1229                                 goto err;
1230                                 }
1231
1232                         /* Duplicate the ECDH structure. */
1233                         if (ecdhp == NULL)
1234                                 {
1235                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1236                                 goto err;
1237                                 }
1238                         if (!EC_KEY_up_ref(ecdhp))
1239                                 {
1240                                 SSLerr(SSL_F_SSL3_CTRL,ERR_R_ECDH_LIB);
1241                                 goto err;
1242                                 }
1243                         ecdh = ecdhp;
1244
1245                         s->s3->tmp.ecdh=ecdh;
1246                         if ((ecdh->pub_key == NULL) ||
1247                             (ecdh->priv_key == NULL) ||
1248                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1249                                 {
1250                                 if(!EC_KEY_generate_key(ecdh))
1251                                     {
1252                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1253                                     goto err;
1254                                     }
1255                                 }
1256
1257                         if ((ecdh->group == NULL) ||
1258                             (ecdh->pub_key == NULL) ||
1259                             (ecdh->priv_key == NULL))
1260                                 {
1261                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1262                                 goto err;
1263                                 }
1264
1265                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1266                             (EC_GROUP_get_degree(ecdh->group) > 163))
1267                                 {
1268                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1269                                 goto err;
1270                                 }
1271
1272                         /* XXX: For now, we only support ephemeral ECDH
1273                          * keys over named (not generic) curves. For
1274                          * supported named curves, curve_id is non-zero.
1275                          */
1276                         if ((curve_id =
1277                             nid2curve_id(EC_GROUP_get_nid(ecdh->group)))
1278                             == 0)
1279                                 {
1280                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1281                                 goto err;
1282                                 }
1283
1284                         /* Encode the public key.
1285                          * First check the size of encoding and
1286                          * allocate memory accordingly.
1287                          */
1288                         encodedlen = EC_POINT_point2oct(ecdh->group,
1289                             ecdh->pub_key,
1290                             POINT_CONVERSION_UNCOMPRESSED,
1291                             NULL, 0, NULL);
1292
1293                         encodedPoint = (unsigned char *)
1294                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1295                         bn_ctx = BN_CTX_new();
1296                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1297                                 {
1298                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1299                                 goto err;
1300                                 }
1301
1302
1303                         encodedlen = EC_POINT_point2oct(ecdh->group,
1304                             ecdh->pub_key,
1305                             POINT_CONVERSION_UNCOMPRESSED,
1306                             encodedPoint, encodedlen, bn_ctx);
1307
1308                         if (encodedlen == 0)
1309                                 {
1310                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1311                                 goto err;
1312                                 }
1313
1314                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1315
1316                         /* XXX: For now, we only support named (not
1317                          * generic) curves in ECDH ephemeral key exchanges.
1318                          * In this situation, we need three additional bytes
1319                          * to encode the entire ServerECDHParams
1320                          * structure.
1321                          */
1322                         n = 3 + encodedlen;
1323
1324                         /* We'll generate the serverKeyExchange message
1325                          * explicitly so we can set these to NULLs
1326                          */
1327                         r[0]=NULL;
1328                         r[1]=NULL;
1329                         r[2]=NULL;
1330                         }
1331                 else
1332 #endif /* !OPENSSL_NO_ECDH */
1333                         {
1334                         al=SSL_AD_HANDSHAKE_FAILURE;
1335                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1336                         goto f_err;
1337                         }
1338                 for (i=0; r[i] != NULL; i++)
1339                         {
1340                         nr[i]=BN_num_bytes(r[i]);
1341                         n+=2+nr[i];
1342                         }
1343
1344                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1345                         {
1346                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1347                                 == NULL)
1348                                 {
1349                                 al=SSL_AD_DECODE_ERROR;
1350                                 goto f_err;
1351                                 }
1352                         kn=EVP_PKEY_size(pkey);
1353                         }
1354                 else
1355                         {
1356                         pkey=NULL;
1357                         kn=0;
1358                         }
1359
1360                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1361                         {
1362                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1363                         goto err;
1364                         }
1365                 d=(unsigned char *)s->init_buf->data;
1366                 p= &(d[4]);
1367
1368                 for (i=0; r[i] != NULL; i++)
1369                         {
1370                         s2n(nr[i],p);
1371                         BN_bn2bin(r[i],p);
1372                         p+=nr[i];
1373                         }
1374
1375 #ifndef OPENSSL_NO_ECDH
1376                 if (type & SSL_kECDHE)
1377                         {
1378                         /* XXX: For now, we only support named (not generic) curves.
1379                          * In this situation, the serverKeyExchange message has:
1380                          * [1 byte CurveType], [1 byte CurveName]
1381                          * [1 byte length of encoded point], followed by
1382                          * the actual encoded point itself
1383                          */
1384                         *p = NAMED_CURVE_TYPE;
1385                         p += 1;
1386                         *p = curve_id;
1387                         p += 1;
1388                         *p = encodedlen;
1389                         p += 1;
1390                         memcpy((unsigned char*)p,
1391                             (unsigned char *)encodedPoint,
1392                             encodedlen);
1393                         OPENSSL_free(encodedPoint);
1394                         p += encodedlen;
1395                         }
1396 #endif
1397
1398                 /* not anonymous */
1399                 if (pkey != NULL)
1400                         {
1401                         /* n is the length of the params, they start at &(d[4])
1402                          * and p points to the space at the end. */
1403 #ifndef OPENSSL_NO_RSA
1404                         if (pkey->type == EVP_PKEY_RSA)
1405                                 {
1406                                 q=md_buf;
1407                                 j=0;
1408                                 for (num=2; num > 0; num--)
1409                                         {
1410                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1411                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1412                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1413                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1414                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1415                                         EVP_DigestFinal_ex(&md_ctx,q,
1416                                                 (unsigned int *)&i);
1417                                         q+=i;
1418                                         j+=i;
1419                                         }
1420                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1421                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1422                                         {
1423                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1424                                         goto err;
1425                                         }
1426                                 s2n(u,p);
1427                                 n+=u+2;
1428                                 }
1429                         else
1430 #endif
1431 #if !defined(OPENSSL_NO_DSA)
1432                                 if (pkey->type == EVP_PKEY_DSA)
1433                                 {
1434                                 /* lets do DSS */
1435                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1436                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1437                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1438                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1439                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1440                                         (unsigned int *)&i,pkey))
1441                                         {
1442                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1443                                         goto err;
1444                                         }
1445                                 s2n(i,p);
1446                                 n+=i+2;
1447                                 }
1448                         else
1449 #endif
1450 #if !defined(OPENSSL_NO_ECDSA)
1451                                 if (pkey->type == EVP_PKEY_EC)
1452                                 {
1453                                 /* let's do ECDSA */
1454                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1455                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1456                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1457                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1458                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1459                                         (unsigned int *)&i,pkey))
1460                                         {
1461                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1462                                         goto err;
1463                                         }
1464                                 s2n(i,p);
1465                                 n+=i+2;
1466                                 }
1467                         else
1468 #endif
1469                                 {
1470                                 /* Is this error check actually needed? */
1471                                 al=SSL_AD_HANDSHAKE_FAILURE;
1472                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1473                                 goto f_err;
1474                                 }
1475                         }
1476
1477                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1478                 l2n3(n,d);
1479
1480                 /* we should now have things packed up, so lets send
1481                  * it off */
1482                 s->init_num=n+4;
1483                 s->init_off=0;
1484                 }
1485
1486         s->state = SSL3_ST_SW_KEY_EXCH_B;
1487         EVP_MD_CTX_cleanup(&md_ctx);
1488         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1489 f_err:
1490         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1491 err:
1492 #ifndef OPENSSL_NO_ECDH
1493         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1494         BN_CTX_free(bn_ctx);
1495 #endif
1496         EVP_MD_CTX_cleanup(&md_ctx);
1497         return(-1);
1498         }
1499
1500 static int ssl3_send_certificate_request(SSL *s)
1501         {
1502         unsigned char *p,*d;
1503         int i,j,nl,off,n;
1504         STACK_OF(X509_NAME) *sk=NULL;
1505         X509_NAME *name;
1506         BUF_MEM *buf;
1507
1508         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1509                 {
1510                 buf=s->init_buf;
1511
1512                 d=p=(unsigned char *)&(buf->data[4]);
1513
1514                 /* get the list of acceptable cert types */
1515                 p++;
1516                 n=ssl3_get_req_cert_type(s,p);
1517                 d[0]=n;
1518                 p+=n;
1519                 n++;
1520
1521                 off=n;
1522                 p+=2;
1523                 n+=2;
1524
1525                 sk=SSL_get_client_CA_list(s);
1526                 nl=0;
1527                 if (sk != NULL)
1528                         {
1529                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1530                                 {
1531                                 name=sk_X509_NAME_value(sk,i);
1532                                 j=i2d_X509_NAME(name,NULL);
1533                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1534                                         {
1535                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1536                                         goto err;
1537                                         }
1538                                 p=(unsigned char *)&(buf->data[4+n]);
1539                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1540                                         {
1541                                         s2n(j,p);
1542                                         i2d_X509_NAME(name,&p);
1543                                         n+=2+j;
1544                                         nl+=2+j;
1545                                         }
1546                                 else
1547                                         {
1548                                         d=p;
1549                                         i2d_X509_NAME(name,&p);
1550                                         j-=2; s2n(j,d); j+=2;
1551                                         n+=j;
1552                                         nl+=j;
1553                                         }
1554                                 }
1555                         }
1556                 /* else no CA names */
1557                 p=(unsigned char *)&(buf->data[4+off]);
1558                 s2n(nl,p);
1559
1560                 d=(unsigned char *)buf->data;
1561                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1562                 l2n3(n,d);
1563
1564                 /* we should now have things packed up, so lets send
1565                  * it off */
1566
1567                 s->init_num=n+4;
1568                 s->init_off=0;
1569 #ifdef NETSCAPE_HANG_BUG
1570                 p=(unsigned char *)s->init_buf->data + s->init_num;
1571
1572                 /* do the header */
1573                 *(p++)=SSL3_MT_SERVER_DONE;
1574                 *(p++)=0;
1575                 *(p++)=0;
1576                 *(p++)=0;
1577                 s->init_num += 4;
1578 #endif
1579
1580                 s->state = SSL3_ST_SW_CERT_REQ_B;
1581                 }
1582
1583         /* SSL3_ST_SW_CERT_REQ_B */
1584         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1585 err:
1586         return(-1);
1587         }
1588
1589
1590 static const int KDF1_SHA1_len = 20;
1591 static void *KDF1_SHA1(void *in, size_t inlen, void *out, size_t outlen)
1592         {
1593 #ifndef OPENSSL_NO_SHA
1594         if (outlen != SHA_DIGEST_LENGTH)
1595                 return NULL;
1596         return SHA1(in, inlen, out);
1597 #else
1598         return NULL;
1599 #endif
1600         }
1601
1602 static int ssl3_get_client_key_exchange(SSL *s)
1603         {
1604         int i,al,ok;
1605         long n;
1606         unsigned long l;
1607         unsigned char *p;
1608 #ifndef OPENSSL_NO_RSA
1609         RSA *rsa=NULL;
1610         EVP_PKEY *pkey=NULL;
1611 #endif
1612 #ifndef OPENSSL_NO_DH
1613         BIGNUM *pub=NULL;
1614         DH *dh_srvr;
1615 #endif
1616 #ifndef OPENSSL_NO_KRB5
1617         KSSL_ERR kssl_err;
1618 #endif /* OPENSSL_NO_KRB5 */
1619
1620 #ifndef OPENSSL_NO_ECDH
1621         EC_KEY *srvr_ecdh = NULL;
1622         EVP_PKEY *clnt_pub_pkey = NULL;
1623         EC_POINT *clnt_ecpoint = NULL;
1624         BN_CTX *bn_ctx = NULL;
1625 #endif
1626
1627         n=ssl3_get_message(s,
1628                 SSL3_ST_SR_KEY_EXCH_A,
1629                 SSL3_ST_SR_KEY_EXCH_B,
1630                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1631                 2048, /* ??? */
1632                 &ok);
1633
1634         if (!ok) return((int)n);
1635         p=(unsigned char *)s->init_msg;
1636
1637         l=s->s3->tmp.new_cipher->algorithms;
1638
1639 #ifndef OPENSSL_NO_RSA
1640         if (l & SSL_kRSA)
1641                 {
1642                 /* FIX THIS UP EAY EAY EAY EAY */
1643                 if (s->s3->tmp.use_rsa_tmp)
1644                         {
1645                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1646                                 rsa=s->cert->rsa_tmp;
1647                         /* Don't do a callback because rsa_tmp should
1648                          * be sent already */
1649                         if (rsa == NULL)
1650                                 {
1651                                 al=SSL_AD_HANDSHAKE_FAILURE;
1652                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1653                                 goto f_err;
1654
1655                                 }
1656                         }
1657                 else
1658                         {
1659                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1660                         if (    (pkey == NULL) ||
1661                                 (pkey->type != EVP_PKEY_RSA) ||
1662                                 (pkey->pkey.rsa == NULL))
1663                                 {
1664                                 al=SSL_AD_HANDSHAKE_FAILURE;
1665                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1666                                 goto f_err;
1667                                 }
1668                         rsa=pkey->pkey.rsa;
1669                         }
1670
1671                 /* TLS */
1672                 if (s->version > SSL3_VERSION)
1673                         {
1674                         n2s(p,i);
1675                         if (n != i+2)
1676                                 {
1677                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1678                                         {
1679                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1680                                         goto err;
1681                                         }
1682                                 else
1683                                         p-=2;
1684                                 }
1685                         else
1686                                 n=i;
1687                         }
1688
1689                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1690
1691                 al = -1;
1692
1693                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1694                         {
1695                         al=SSL_AD_DECODE_ERROR;
1696                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
1697                         }
1698
1699                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1700                         {
1701                         /* The premaster secret must contain the same version number as the
1702                          * ClientHello to detect version rollback attacks (strangely, the
1703                          * protocol does not offer such protection for DH ciphersuites).
1704                          * However, buggy clients exist that send the negotiated protocol
1705                          * version instead if the server does not support the requested
1706                          * protocol version.
1707                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1708                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1709                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1710                                 {
1711                                 al=SSL_AD_DECODE_ERROR;
1712                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1713
1714                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1715                                  * (http://eprint.iacr.org/2003/052/) exploits the version
1716                                  * number check as a "bad version oracle" -- an alert would
1717                                  * reveal that the plaintext corresponding to some ciphertext
1718                                  * made up by the adversary is properly formatted except
1719                                  * that the version number is wrong.  To avoid such attacks,
1720                                  * we should treat this just like any other decryption error. */
1721                                 }
1722                         }
1723
1724                 if (al != -1)
1725                         {
1726                         /* Some decryption failure -- use random value instead as countermeasure
1727                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1728                          * (see RFC 2246, section 7.4.7.1). */
1729                         ERR_clear_error();
1730                         i = SSL_MAX_MASTER_KEY_LENGTH;
1731                         p[0] = s->client_version >> 8;
1732                         p[1] = s->client_version & 0xff;
1733                         RAND_pseudo_bytes(p+2, i-2); /* should be RAND_bytes, but we cannot work around a failure */
1734                         }
1735
1736                 s->session->master_key_length=
1737                         s->method->ssl3_enc->generate_master_secret(s,
1738                                 s->session->master_key,
1739                                 p,i);
1740                 OPENSSL_cleanse(p,i);
1741                 }
1742         else
1743 #endif
1744 #ifndef OPENSSL_NO_DH
1745                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1746                 {
1747                 n2s(p,i);
1748                 if (n != i+2)
1749                         {
1750                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1751                                 {
1752                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1753                                 goto err;
1754                                 }
1755                         else
1756                                 {
1757                                 p-=2;
1758                                 i=(int)n;
1759                                 }
1760                         }
1761
1762                 if (n == 0L) /* the parameters are in the cert */
1763                         {
1764                         al=SSL_AD_HANDSHAKE_FAILURE;
1765                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1766                         goto f_err;
1767                         }
1768                 else
1769                         {
1770                         if (s->s3->tmp.dh == NULL)
1771                                 {
1772                                 al=SSL_AD_HANDSHAKE_FAILURE;
1773                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1774                                 goto f_err;
1775                                 }
1776                         else
1777                                 dh_srvr=s->s3->tmp.dh;
1778                         }
1779
1780                 pub=BN_bin2bn(p,i,NULL);
1781                 if (pub == NULL)
1782                         {
1783                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1784                         goto err;
1785                         }
1786
1787                 i=DH_compute_key(p,pub,dh_srvr);
1788
1789                 if (i <= 0)
1790                         {
1791                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1792                         goto err;
1793                         }
1794
1795                 DH_free(s->s3->tmp.dh);
1796                 s->s3->tmp.dh=NULL;
1797
1798                 BN_clear_free(pub);
1799                 pub=NULL;
1800                 s->session->master_key_length=
1801                         s->method->ssl3_enc->generate_master_secret(s,
1802                                 s->session->master_key,p,i);
1803                 OPENSSL_cleanse(p,i);
1804                 }
1805         else
1806 #endif
1807 #ifndef OPENSSL_NO_KRB5
1808         if (l & SSL_kKRB5)
1809                 {
1810                 krb5_error_code         krb5rc;
1811                 krb5_data               enc_ticket;
1812                 krb5_data               authenticator;
1813                 krb5_data               enc_pms;
1814                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
1815                 EVP_CIPHER_CTX          ciph_ctx;
1816                 EVP_CIPHER              *enc = NULL;
1817                 unsigned char           iv[EVP_MAX_IV_LENGTH];
1818                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
1819                                                + EVP_MAX_BLOCK_LENGTH];
1820                 int                     padl, outl;
1821                 krb5_timestamp          authtime = 0;
1822                 krb5_ticket_times       ttimes;
1823
1824                 EVP_CIPHER_CTX_init(&ciph_ctx);
1825
1826                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
1827
1828                 n2s(p,i);
1829                 enc_ticket.length = i;
1830                 enc_ticket.data = (char *)p;
1831                 p+=enc_ticket.length;
1832
1833                 n2s(p,i);
1834                 authenticator.length = i;
1835                 authenticator.data = (char *)p;
1836                 p+=authenticator.length;
1837
1838                 n2s(p,i);
1839                 enc_pms.length = i;
1840                 enc_pms.data = (char *)p;
1841                 p+=enc_pms.length;
1842
1843                 /* Note that the length is checked again below,
1844                 ** after decryption
1845                 */
1846                 if(enc_pms.length > sizeof pms)
1847                         {
1848                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1849                                SSL_R_DATA_LENGTH_TOO_LONG);
1850                         goto err;
1851                         }
1852
1853                 if (n != (long)(enc_ticket.length + authenticator.length +
1854                                                 enc_pms.length + 6))
1855                         {
1856                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1857                                 SSL_R_DATA_LENGTH_TOO_LONG);
1858                         goto err;
1859                         }
1860
1861                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
1862                                         &kssl_err)) != 0)
1863                         {
1864 #ifdef KSSL_DEBUG
1865                         printf("kssl_sget_tkt rtn %d [%d]\n",
1866                                 krb5rc, kssl_err.reason);
1867                         if (kssl_err.text)
1868                                 printf("kssl_err text= %s\n", kssl_err.text);
1869 #endif  /* KSSL_DEBUG */
1870                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1871                                 kssl_err.reason);
1872                         goto err;
1873                         }
1874
1875                 /*  Note: no authenticator is not considered an error,
1876                 **  but will return authtime == 0.
1877                 */
1878                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
1879                                         &authtime, &kssl_err)) != 0)
1880                         {
1881 #ifdef KSSL_DEBUG
1882                         printf("kssl_check_authent rtn %d [%d]\n",
1883                                 krb5rc, kssl_err.reason);
1884                         if (kssl_err.text)
1885                                 printf("kssl_err text= %s\n", kssl_err.text);
1886 #endif  /* KSSL_DEBUG */
1887                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
1888                                 kssl_err.reason);
1889                         goto err;
1890                         }
1891
1892                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
1893                         {
1894                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, krb5rc);
1895                         goto err;
1896                         }
1897
1898 #ifdef KSSL_DEBUG
1899                 kssl_ctx_show(kssl_ctx);
1900 #endif  /* KSSL_DEBUG */
1901
1902                 enc = kssl_map_enc(kssl_ctx->enctype);
1903                 if (enc == NULL)
1904                     goto err;
1905
1906                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
1907
1908                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
1909                         {
1910                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1911                                 SSL_R_DECRYPTION_FAILED);
1912                         goto err;
1913                         }
1914                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
1915                                         (unsigned char *)enc_pms.data, enc_pms.length))
1916                         {
1917                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1918                                 SSL_R_DECRYPTION_FAILED);
1919                         goto err;
1920                         }
1921                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1922                         {
1923                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1924                                 SSL_R_DATA_LENGTH_TOO_LONG);
1925                         goto err;
1926                         }
1927                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
1928                         {
1929                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1930                                 SSL_R_DECRYPTION_FAILED);
1931                         goto err;
1932                         }
1933                 outl += padl;
1934                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
1935                         {
1936                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1937                                 SSL_R_DATA_LENGTH_TOO_LONG);
1938                         goto err;
1939                         }
1940                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
1941
1942                 s->session->master_key_length=
1943                         s->method->ssl3_enc->generate_master_secret(s,
1944                                 s->session->master_key, pms, outl);
1945
1946                 if (kssl_ctx->client_princ)
1947                         {
1948                         int len = strlen(kssl_ctx->client_princ);
1949                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
1950                                 {
1951                                 s->session->krb5_client_princ_len = len;
1952                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
1953                                 }
1954                         }
1955
1956
1957                 /*  Was doing kssl_ctx_free() here,
1958                 **  but it caused problems for apache.
1959                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
1960                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
1961                 */
1962                 }
1963         else
1964 #endif  /* OPENSSL_NO_KRB5 */
1965
1966 #ifndef OPENSSL_NO_ECDH
1967                 if ((l & SSL_kECDH) || (l & SSL_kECDHE))
1968                 {
1969                 int ret = 1;
1970                 int field_size = 0;
1971
1972                 /* initialize structures for server's ECDH key pair */
1973                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
1974                         {
1975                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1976                             ERR_R_MALLOC_FAILURE);
1977                         goto err;
1978                         }
1979
1980                 /* Let's get server private key and group information */
1981                 if (l & SSL_kECDH)
1982                         {
1983                         /* use the certificate */
1984                         srvr_ecdh->group = s->cert->key->privatekey-> \
1985                             pkey.eckey->group;
1986                         srvr_ecdh->priv_key = s->cert->key->privatekey-> \
1987                             pkey.eckey->priv_key;
1988                         }
1989                 else
1990                         {
1991                         /* use the ephermeral values we saved when
1992                          * generating the ServerKeyExchange msg.
1993                          */
1994                         srvr_ecdh->group = s->s3->tmp.ecdh->group;
1995                         srvr_ecdh->priv_key = s->s3->tmp.ecdh->priv_key;
1996                         }
1997
1998                 /* Let's get client's public key */
1999                 if ((clnt_ecpoint = EC_POINT_new(srvr_ecdh->group))
2000                     == NULL)
2001                         {
2002                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2003                             ERR_R_MALLOC_FAILURE);
2004                         goto err;
2005                         }
2006
2007                 if (n == 0L)
2008                         {
2009                         /* Client Publickey was in Client Certificate */
2010
2011                          if (l & SSL_kECDHE)
2012                                  {
2013                                  al=SSL_AD_HANDSHAKE_FAILURE;
2014                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2015                                  goto f_err;
2016                                  }
2017                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2018                             == NULL) ||
2019                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2020                                 {
2021                                 /* XXX: For now, we do not support client
2022                                  * authentication using ECDH certificates
2023                                  * so this branch (n == 0L) of the code is
2024                                  * never executed. When that support is
2025                                  * added, we ought to ensure the key
2026                                  * received in the certificate is
2027                                  * authorized for key agreement.
2028                                  * ECDH_compute_key implicitly checks that
2029                                  * the two ECDH shares are for the same
2030                                  * group.
2031                                  */
2032                                 al=SSL_AD_HANDSHAKE_FAILURE;
2033                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2034                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2035                                 goto f_err;
2036                                 }
2037
2038                         EC_POINT_copy(clnt_ecpoint,
2039                             clnt_pub_pkey->pkey.eckey->pub_key);
2040                         ret = 2; /* Skip certificate verify processing */
2041                         }
2042                 else
2043                         {
2044                         /* Get client's public key from encoded point
2045                          * in the ClientKeyExchange message.
2046                          */
2047                         if ((bn_ctx = BN_CTX_new()) == NULL)
2048                                 {
2049                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2050                                     ERR_R_MALLOC_FAILURE);
2051                                 goto err;
2052                                 }
2053
2054                         /* Get encoded point length */
2055                         i = *p;
2056                         p += 1;
2057                         if (EC_POINT_oct2point(srvr_ecdh->group,
2058                             clnt_ecpoint, p, i, bn_ctx) == 0)
2059                                 {
2060                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2061                                     ERR_R_EC_LIB);
2062                                 goto err;
2063                                 }
2064                         /* p is pointing to somewhere in the buffer
2065                          * currently, so set it to the start
2066                          */
2067                         p=(unsigned char *)s->init_buf->data;
2068                         }
2069
2070                 /* Compute the shared pre-master secret */
2071                 field_size = EC_GROUP_get_degree(srvr_ecdh->group);
2072                 if (field_size <= 0)
2073                         {
2074                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2075                                ERR_R_ECDH_LIB);
2076                         goto err;
2077                         }
2078                 /* If field size is not more than 24 octets, then use SHA-1 hash of result;
2079                  * otherwise, use result (see section 4.8 of draft-ietf-tls-ecc-03.txt;
2080                  * this is new with this version of the Internet Draft).
2081                  */
2082                 if (field_size <= 24 * 8)
2083                     i = ECDH_compute_key(p, KDF1_SHA1_len, clnt_ecpoint, srvr_ecdh, KDF1_SHA1);
2084                 else
2085                     i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2086                 if (i <= 0)
2087                         {
2088                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2089                             ERR_R_ECDH_LIB);
2090                         goto err;
2091                         }
2092
2093                 EVP_PKEY_free(clnt_pub_pkey);
2094                 EC_POINT_free(clnt_ecpoint);
2095                 if (srvr_ecdh != NULL)
2096                         {
2097                         srvr_ecdh->priv_key = NULL;
2098                         srvr_ecdh->group = NULL;
2099                         EC_KEY_free(srvr_ecdh);
2100                         }
2101                 BN_CTX_free(bn_ctx);
2102
2103                 /* Compute the master secret */
2104                 s->session->master_key_length = s->method->ssl3_enc-> \
2105                     generate_master_secret(s, s->session->master_key, p, i);
2106
2107                 OPENSSL_cleanse(p, i);
2108                 return (ret);
2109                 }
2110         else
2111 #endif
2112                 {
2113                 al=SSL_AD_HANDSHAKE_FAILURE;
2114                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2115                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2116                 goto f_err;
2117                 }
2118
2119         return(1);
2120 f_err:
2121         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2122 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2123 err:
2124 #endif
2125 #ifndef OPENSSL_NO_ECDH
2126         EVP_PKEY_free(clnt_pub_pkey);
2127         EC_POINT_free(clnt_ecpoint);
2128         if (srvr_ecdh != NULL)
2129                 {
2130                 srvr_ecdh->priv_key = NULL;
2131                 srvr_ecdh->group = NULL;
2132                 EC_KEY_free(srvr_ecdh);
2133                 }
2134         BN_CTX_free(bn_ctx);
2135 #endif
2136         return(-1);
2137         }
2138
2139 static int ssl3_get_cert_verify(SSL *s)
2140         {
2141         EVP_PKEY *pkey=NULL;
2142         unsigned char *p;
2143         int al,ok,ret=0;
2144         long n;
2145         int type=0,i,j;
2146         X509 *peer;
2147
2148         n=ssl3_get_message(s,
2149                 SSL3_ST_SR_CERT_VRFY_A,
2150                 SSL3_ST_SR_CERT_VRFY_B,
2151                 -1,
2152                 514, /* 514? */
2153                 &ok);
2154
2155         if (!ok) return((int)n);
2156
2157         if (s->session->peer != NULL)
2158                 {
2159                 peer=s->session->peer;
2160                 pkey=X509_get_pubkey(peer);
2161                 type=X509_certificate_type(peer,pkey);
2162                 }
2163         else
2164                 {
2165                 peer=NULL;
2166                 pkey=NULL;
2167                 }
2168
2169         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2170                 {
2171                 s->s3->tmp.reuse_message=1;
2172                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2173                         {
2174                         al=SSL_AD_UNEXPECTED_MESSAGE;
2175                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2176                         goto f_err;
2177                         }
2178                 ret=1;
2179                 goto end;
2180                 }
2181
2182         if (peer == NULL)
2183                 {
2184                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2185                 al=SSL_AD_UNEXPECTED_MESSAGE;
2186                 goto f_err;
2187                 }
2188
2189         if (!(type & EVP_PKT_SIGN))
2190                 {
2191                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2192                 al=SSL_AD_ILLEGAL_PARAMETER;
2193                 goto f_err;
2194                 }
2195
2196         if (s->s3->change_cipher_spec)
2197                 {
2198                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2199                 al=SSL_AD_UNEXPECTED_MESSAGE;
2200                 goto f_err;
2201                 }
2202
2203         /* we now have a signature that we need to verify */
2204         p=(unsigned char *)s->init_msg;
2205         n2s(p,i);
2206         n-=2;
2207         if (i > n)
2208                 {
2209                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2210                 al=SSL_AD_DECODE_ERROR;
2211                 goto f_err;
2212                 }
2213
2214         j=EVP_PKEY_size(pkey);
2215         if ((i > j) || (n > j) || (n <= 0))
2216                 {
2217                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2218                 al=SSL_AD_DECODE_ERROR;
2219                 goto f_err;
2220                 }
2221
2222 #ifndef OPENSSL_NO_RSA
2223         if (pkey->type == EVP_PKEY_RSA)
2224                 {
2225                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2226                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
2227                                                         pkey->pkey.rsa);
2228                 if (i < 0)
2229                         {
2230                         al=SSL_AD_DECRYPT_ERROR;
2231                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2232                         goto f_err;
2233                         }
2234                 if (i == 0)
2235                         {
2236                         al=SSL_AD_DECRYPT_ERROR;
2237                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2238                         goto f_err;
2239                         }
2240                 }
2241         else
2242 #endif
2243 #ifndef OPENSSL_NO_DSA
2244                 if (pkey->type == EVP_PKEY_DSA)
2245                 {
2246                 j=DSA_verify(pkey->save_type,
2247                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2248                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2249                 if (j <= 0)
2250                         {
2251                         /* bad signature */
2252                         al=SSL_AD_DECRYPT_ERROR;
2253                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2254                         goto f_err;
2255                         }
2256                 }
2257         else
2258 #endif
2259 #ifndef OPENSSL_NO_ECDSA
2260                 if (pkey->type == EVP_PKEY_EC)
2261                 {
2262                 j=ECDSA_verify(pkey->save_type,
2263                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2264                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.eckey);
2265                 if (j <= 0)
2266                         {
2267                         /* bad signature */
2268                         al=SSL_AD_DECRYPT_ERROR;
2269                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2270                             SSL_R_BAD_ECDSA_SIGNATURE);
2271                         goto f_err;
2272                         }
2273                 }
2274         else
2275 #endif
2276                 {
2277                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2278                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2279                 goto f_err;
2280                 }
2281
2282
2283         ret=1;
2284         if (0)
2285                 {
2286 f_err:
2287                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2288                 }
2289 end:
2290         EVP_PKEY_free(pkey);
2291         return(ret);
2292         }
2293
2294 static int ssl3_get_client_certificate(SSL *s)
2295         {
2296         int i,ok,al,ret= -1;
2297         X509 *x=NULL;
2298         unsigned long l,nc,llen,n;
2299         const unsigned char *p,*q;
2300         unsigned char *d;
2301         STACK_OF(X509) *sk=NULL;
2302
2303         n=ssl3_get_message(s,
2304                 SSL3_ST_SR_CERT_A,
2305                 SSL3_ST_SR_CERT_B,
2306                 -1,
2307                 s->max_cert_list,
2308                 &ok);
2309
2310         if (!ok) return((int)n);
2311
2312         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2313                 {
2314                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2315                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2316                         {
2317                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2318                         al=SSL_AD_HANDSHAKE_FAILURE;
2319                         goto f_err;
2320                         }
2321                 /* If tls asked for a client cert, the client must return a 0 list */
2322                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2323                         {
2324                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2325                         al=SSL_AD_UNEXPECTED_MESSAGE;
2326                         goto f_err;
2327                         }
2328                 s->s3->tmp.reuse_message=1;
2329                 return(1);
2330                 }
2331
2332         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2333                 {
2334                 al=SSL_AD_UNEXPECTED_MESSAGE;
2335                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2336                 goto f_err;
2337                 }
2338         p=d=(unsigned char *)s->init_msg;
2339
2340         if ((sk=sk_X509_new_null()) == NULL)
2341                 {
2342                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2343                 goto err;
2344                 }
2345
2346         n2l3(p,llen);
2347         if (llen+3 != n)
2348                 {
2349                 al=SSL_AD_DECODE_ERROR;
2350                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2351                 goto f_err;
2352                 }
2353         for (nc=0; nc<llen; )
2354                 {
2355                 n2l3(p,l);
2356                 if ((l+nc+3) > llen)
2357                         {
2358                         al=SSL_AD_DECODE_ERROR;
2359                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2360                         goto f_err;
2361                         }
2362
2363                 q=p;
2364                 x=d2i_X509(NULL,&p,l);
2365                 if (x == NULL)
2366                         {
2367                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2368                         goto err;
2369                         }
2370                 if (p != (q+l))
2371                         {
2372                         al=SSL_AD_DECODE_ERROR;
2373                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2374                         goto f_err;
2375                         }
2376                 if (!sk_X509_push(sk,x))
2377                         {
2378                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2379                         goto err;
2380                         }
2381                 x=NULL;
2382                 nc+=l+3;
2383                 }
2384
2385         if (sk_X509_num(sk) <= 0)
2386                 {
2387                 /* TLS does not mind 0 certs returned */
2388                 if (s->version == SSL3_VERSION)
2389                         {
2390                         al=SSL_AD_HANDSHAKE_FAILURE;
2391                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2392                         goto f_err;
2393                         }
2394                 /* Fail for TLS only if we required a certificate */
2395                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2396                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2397                         {
2398                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2399                         al=SSL_AD_HANDSHAKE_FAILURE;
2400                         goto f_err;
2401                         }
2402                 }
2403         else
2404                 {
2405                 i=ssl_verify_cert_chain(s,sk);
2406                 if (!i)
2407                         {
2408                         al=ssl_verify_alarm_type(s->verify_result);
2409                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2410                         goto f_err;
2411                         }
2412                 }
2413
2414         if (s->session->peer != NULL) /* This should not be needed */
2415                 X509_free(s->session->peer);
2416         s->session->peer=sk_X509_shift(sk);
2417         s->session->verify_result = s->verify_result;
2418
2419         /* With the current implementation, sess_cert will always be NULL
2420          * when we arrive here. */
2421         if (s->session->sess_cert == NULL)
2422                 {
2423                 s->session->sess_cert = ssl_sess_cert_new();
2424                 if (s->session->sess_cert == NULL)
2425                         {
2426                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2427                         goto err;
2428                         }
2429                 }
2430         if (s->session->sess_cert->cert_chain != NULL)
2431                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2432         s->session->sess_cert->cert_chain=sk;
2433         /* Inconsistency alert: cert_chain does *not* include the
2434          * peer's own certificate, while we do include it in s3_clnt.c */
2435
2436         sk=NULL;
2437
2438         ret=1;
2439         if (0)
2440                 {
2441 f_err:
2442                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2443                 }
2444 err:
2445         if (x != NULL) X509_free(x);
2446         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2447         return(ret);
2448         }
2449
2450 int ssl3_send_server_certificate(SSL *s)
2451         {
2452         unsigned long l;
2453         X509 *x;
2454
2455         if (s->state == SSL3_ST_SW_CERT_A)
2456                 {
2457                 x=ssl_get_server_send_cert(s);
2458                 if (x == NULL &&
2459                         /* VRS: allow null cert if auth == KRB5 */
2460                         (s->s3->tmp.new_cipher->algorithms
2461                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
2462                         != (SSL_aKRB5|SSL_kKRB5))
2463                         {
2464                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2465                         return(0);
2466                         }
2467
2468                 l=ssl3_output_cert_chain(s,x);
2469                 s->state=SSL3_ST_SW_CERT_B;
2470                 s->init_num=(int)l;
2471                 s->init_off=0;
2472                 }
2473
2474         /* SSL3_ST_SW_CERT_B */
2475         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2476         }
2477
2478
2479 #ifndef OPENSSL_NO_ECDH
2480 /* This is the complement of curve_id2nid in s3_clnt.c. */
2481 static int nid2curve_id(int nid)
2482 {
2483         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2484          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2485         switch (nid) {
2486         case NID_sect163k1: /* sect163k1 (1) */
2487                 return 1;
2488         case NID_sect163r1: /* sect163r1 (2) */
2489                 return 2;
2490         case NID_sect163r2: /* sect163r2 (3) */
2491                 return 3;
2492         case NID_sect193r1: /* sect193r1 (4) */
2493                 return 4;
2494         case NID_sect193r2: /* sect193r2 (5) */
2495                 return 5;
2496         case NID_sect233k1: /* sect233k1 (6) */
2497                 return 6;
2498         case NID_sect233r1: /* sect233r1 (7) */
2499                 return 7;
2500         case NID_sect239k1: /* sect239k1 (8) */
2501                 return 8;
2502         case NID_sect283k1: /* sect283k1 (9) */
2503                 return 9;
2504         case NID_sect283r1: /* sect283r1 (10) */
2505                 return 10;
2506         case NID_sect409k1: /* sect409k1 (11) */
2507                 return 11;
2508         case NID_sect409r1: /* sect409r1 (12) */
2509                 return 12;
2510         case NID_sect571k1: /* sect571k1 (13) */
2511                 return 13;
2512         case NID_sect571r1: /* sect571r1 (14) */
2513                 return 14;
2514         case NID_secp160k1: /* secp160k1 (15) */
2515                 return 15;
2516         case NID_secp160r1: /* secp160r1 (16) */
2517                 return 16;
2518         case NID_secp160r2: /* secp160r2 (17) */
2519                 return 17;
2520         case NID_secp192k1: /* secp192k1 (18) */
2521                 return 18;
2522         case NID_X9_62_prime192v1: /* secp192r1 (19) */
2523                 return 19;
2524         case NID_secp224k1: /* secp224k1 (20) */
2525                 return 20;
2526         case NID_secp224r1: /* secp224r1 (21) */
2527                 return 21;
2528         case NID_secp256k1: /* secp256k1 (22) */
2529                 return 22;
2530         case NID_X9_62_prime256v1: /* secp256r1 (23) */
2531                 return 23;
2532         case NID_secp384r1: /* secp384r1 (24) */
2533                 return 24;
2534         case NID_secp521r1:  /* secp521r1 (25) */
2535                 return 25;
2536         default:
2537                 return 0;
2538         }
2539 }
2540 #endif