ssl/s3_srvr.c

   1 /* ssl/s3_srvr.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2005 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124
 125 #define REUSE_CIPHER_BUG
 126 #define NETSCAPE_HANG_BUG
 127
 128 #include <stdio.h>
 129 #include "ssl_locl.h"
 130 #include "kssl_lcl.h"
 131 #include <openssl/buffer.h>
 132 #include <openssl/rand.h>
 133 #include <openssl/objects.h>
 134 #include <openssl/evp.h>
 135 #include <openssl/hmac.h>
 136 #include <openssl/x509.h>
 137 #ifndef OPENSSL_NO_DH
 138 #include <openssl/dh.h>
 139 #endif
 140 #include <openssl/bn.h>
 141 #ifndef OPENSSL_NO_KRB5
 142 #include <openssl/krb5_asn.h>
 143 #endif
 144 #include <openssl/md5.h>
 145
 146 static SSL_METHOD *ssl3_get_server_method(int ver);
 147 #ifndef OPENSSL_NO_ECDH
 148 static int nid2curve_id(int nid);
 149 #endif
 150
 151 static SSL_METHOD *ssl3_get_server_method(int ver)
 152         {
 153         if (ver == SSL3_VERSION)
 154                 return(SSLv3_server_method());
 155         else
 156                 return(NULL);
 157         }
 158
 159 IMPLEMENT_ssl3_meth_func(SSLv3_server_method,
 160                         ssl3_accept,
 161                         ssl_undefined_function,
 162                         ssl3_get_server_method)
 163
 164 int ssl3_accept(SSL *s)
 165         {
 166         BUF_MEM *buf;
 167         unsigned long l,Time=(unsigned long)time(NULL);
 168         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 169         int ret= -1;
 170         int new_state,state,skip=0;
 171
 172         RAND_add(&Time,sizeof(Time),0);
 173         ERR_clear_error();
 174         clear_sys_error();
 175
 176         if (s->info_callback != NULL)
 177                 cb=s->info_callback;
 178         else if (s->ctx->info_callback != NULL)
 179                 cb=s->ctx->info_callback;
 180
 181         /* init things to blank */
 182         s->in_handshake++;
 183         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 184
 185         if (s->cert == NULL)
 186                 {
 187                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 188                 return(-1);
 189                 }
 190
 191         for (;;)
 192                 {
 193                 state=s->state;
 194
 195                 switch (s->state)
 196                         {
 197                 case SSL_ST_RENEGOTIATE:
 198                         s->new_session=1;
 199                         /* s->state=SSL_ST_ACCEPT; */
 200
 201                 case SSL_ST_BEFORE:
 202                 case SSL_ST_ACCEPT:
 203                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 204                 case SSL_ST_OK|SSL_ST_ACCEPT:
 205
 206                         s->server=1;
 207                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 208
 209                         if ((s->version>>8) != 3)
 210                                 {
 211                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 212                                 return -1;
 213                                 }
 214                         s->type=SSL_ST_ACCEPT;
 215
 216                         if (s->init_buf == NULL)
 217                                 {
 218                                 if ((buf=BUF_MEM_new()) == NULL)
 219                                         {
 220                                         ret= -1;
 221                                         goto end;
 222                                         }
 223                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 224                                         {
 225                                         ret= -1;
 226                                         goto end;
 227                                         }
 228                                 s->init_buf=buf;
 229                                 }
 230
 231                         if (!ssl3_setup_buffers(s))
 232                                 {
 233                                 ret= -1;
 234                                 goto end;
 235                                 }
 236
 237                         s->init_num=0;
 238
 239                         if (s->state != SSL_ST_RENEGOTIATE)
 240                                 {
 241                                 /* Ok, we now need to push on a buffering BIO so that
 242                                  * the output is sent in a way that TCP likes :-)
 243                                  */
 244                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 245
 246                                 ssl3_init_finished_mac(s);
 247                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 248                                 s->ctx->stats.sess_accept++;
 249                                 }
 250                         else if (!s->s3->send_connection_binding &&
 251                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
 252                                 {
 253                                 /* Server attempting to renegotiate with
 254                                  * client that doesn't support secure
 255                                  * renegotiation.
 256                                  */
 257                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
 258                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 259                                 ret = -1;
 260                                 goto end;
 261                                 }
 262                         else
 263                                 {
 264                                 /* s->state == SSL_ST_RENEGOTIATE,
 265                                  * we will just send a HelloRequest */
 266                                 s->ctx->stats.sess_accept_renegotiate++;
 267                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 268                                 }
 269                         break;
 270
 271                 case SSL3_ST_SW_HELLO_REQ_A:
 272                 case SSL3_ST_SW_HELLO_REQ_B:
 273
 274                         s->shutdown=0;
 275                         ret=ssl3_send_hello_request(s);
 276                         if (ret <= 0) goto end;
 277                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 278                         s->state=SSL3_ST_SW_FLUSH;
 279                         s->init_num=0;
 280
 281                         ssl3_init_finished_mac(s);
 282                         break;
 283
 284                 case SSL3_ST_SW_HELLO_REQ_C:
 285                         s->state=SSL_ST_OK;
 286                         break;
 287
 288                 case SSL3_ST_SR_CLNT_HELLO_A:
 289                 case SSL3_ST_SR_CLNT_HELLO_B:
 290                 case SSL3_ST_SR_CLNT_HELLO_C:
 291
 292                         s->shutdown=0;
 293                         ret=ssl3_get_client_hello(s);
 294                         if (ret <= 0) goto end;
 295                         s->new_session = 2;
 296                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 297                         s->init_num=0;
 298                         break;
 299
 300                 case SSL3_ST_SW_SRVR_HELLO_A:
 301                 case SSL3_ST_SW_SRVR_HELLO_B:
 302                         ret=ssl3_send_server_hello(s);
 303                         if (ret <= 0) goto end;
 304 #ifndef OPENSSL_NO_TLSEXT
 305                         if (s->hit)
 306                                 {
 307                                 if (s->tlsext_ticket_expected)
 308                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 309                                 else
 310                                         s->state=SSL3_ST_SW_CHANGE_A;
 311                                 }
 312 #else
 313                         if (s->hit)
 314                                         s->state=SSL3_ST_SW_CHANGE_A;
 315 #endif
 316                         else
 317                                 s->state=SSL3_ST_SW_CERT_A;
 318                         s->init_num=0;
 319                         break;
 320
 321                 case SSL3_ST_SW_CERT_A:
 322                 case SSL3_ST_SW_CERT_B:
 323                         /* Check if it is anon DH or anon ECDH or KRB5 */
 324                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)
 325                                 && !(s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 326                                 {
 327                                 ret=ssl3_send_server_certificate(s);
 328                                 if (ret <= 0) goto end;
 329 #ifndef OPENSSL_NO_TLSEXT
 330                                 if (s->tlsext_status_expected)
 331                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 332                                 else
 333                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 334                                 }
 335                         else
 336                                 {
 337                                 skip = 1;
 338                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 339                                 }
 340 #else
 341                                 }
 342                         else
 343                                 skip=1;
 344
 345                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 346 #endif
 347                         s->init_num=0;
 348                         break;
 349
 350                 case SSL3_ST_SW_KEY_EXCH_A:
 351                 case SSL3_ST_SW_KEY_EXCH_B:
 352                         l=s->s3->tmp.new_cipher->algorithms;
 353
 354                         /* clear this, it may get reset by
 355                          * send_server_key_exchange */
 356                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 357 #ifndef OPENSSL_NO_KRB5
 358                                 && !(l & SSL_KRB5)
 359 #endif /* OPENSSL_NO_KRB5 */
 360                                 )
 361                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 362                                  * even when forbidden by protocol specs
 363                                  * (handshake may fail as clients are not required to
 364                                  * be able to handle this) */
 365                                 s->s3->tmp.use_rsa_tmp=1;
 366                         else
 367                                 s->s3->tmp.use_rsa_tmp=0;
 368
 369
 370                         /* only send if a DH key exchange, fortezza or
 371                          * RSA but we have a sign only certificate
 372                          *
 373                          * For ECC ciphersuites, we send a serverKeyExchange
 374                          * message only if the cipher suite is either
 375                          * ECDH-anon or ECDHE. In other cases, the
 376                          * server certificate contains the server's
 377                          * public key for key exchange.
 378                          */
 379                         if (s->s3->tmp.use_rsa_tmp
 380                             || (l & SSL_kECDHE)
 381                             || (l & (SSL_DH|SSL_kFZA))
 382                             || ((l & SSL_kRSA)
 383                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 384                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 385                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 386                                         )
 387                                     )
 388                                 )
 389                             )
 390                                 {
 391                                 ret=ssl3_send_server_key_exchange(s);
 392                                 if (ret <= 0) goto end;
 393                                 }
 394                         else
 395                                 skip=1;
 396
 397                         s->state=SSL3_ST_SW_CERT_REQ_A;
 398                         s->init_num=0;
 399                         break;
 400
 401                 case SSL3_ST_SW_CERT_REQ_A:
 402                 case SSL3_ST_SW_CERT_REQ_B:
 403                         if (/* don't request cert unless asked for it: */
 404                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 405                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 406                                  * don't request cert during re-negotiation: */
 407                                 ((s->session->peer != NULL) &&
 408                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 409                                 /* never request cert in anonymous ciphersuites
 410                                  * (see section "Certificate request" in SSL 3 drafts
 411                                  * and in RFC 2246): */
 412                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 413                                  /* ... except when the application insists on verification
 414                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 415                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 416                                  /* never request cert in Kerberos ciphersuites */
 417                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 418                                 {
 419                                 /* no cert request */
 420                                 skip=1;
 421                                 s->s3->tmp.cert_request=0;
 422                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 423                                 }
 424                         else
 425                                 {
 426                                 s->s3->tmp.cert_request=1;
 427                                 ret=ssl3_send_certificate_request(s);
 428                                 if (ret <= 0) goto end;
 429 #ifndef NETSCAPE_HANG_BUG
 430                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 431 #else
 432                                 s->state=SSL3_ST_SW_FLUSH;
 433                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 434 #endif
 435                                 s->init_num=0;
 436                                 }
 437                         break;
 438
 439                 case SSL3_ST_SW_SRVR_DONE_A:
 440                 case SSL3_ST_SW_SRVR_DONE_B:
 441                         ret=ssl3_send_server_done(s);
 442                         if (ret <= 0) goto end;
 443                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 444                         s->state=SSL3_ST_SW_FLUSH;
 445                         s->init_num=0;
 446                         break;
 447
 448                 case SSL3_ST_SW_FLUSH:
 449
 450                         /* This code originally checked to see if
 451                          * any data was pending using BIO_CTRL_INFO
 452                          * and then flushed. This caused problems
 453                          * as documented in PR#1939. The proposed
 454                          * fix doesn't completely resolve this issue
 455                          * as buggy implementations of BIO_CTRL_PENDING
 456                          * still exist. So instead we just flush
 457                          * unconditionally.
 458                          */
 459
 460                         s->rwstate=SSL_WRITING;
 461                         if (BIO_flush(s->wbio) <= 0)
 462                                 {
 463                                 ret= -1;
 464                                 goto end;
 465                                 }
 466                         s->rwstate=SSL_NOTHING;
 467
 468                         s->state=s->s3->tmp.next_state;
 469                         break;
 470
 471                 case SSL3_ST_SR_CERT_A:
 472                 case SSL3_ST_SR_CERT_B:
 473                         /* Check for second client hello (MS SGC) */
 474                         ret = ssl3_check_client_hello(s);
 475                         if (ret <= 0)
 476                                 goto end;
 477                         if (ret == 2)
 478                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 479                         else {
 480                                 if (s->s3->tmp.cert_request)
 481                                         {
 482                                         ret=ssl3_get_client_certificate(s);
 483                                         if (ret <= 0) goto end;
 484                                         }
 485                                 s->init_num=0;
 486                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 487                         }
 488                         break;
 489
 490                 case SSL3_ST_SR_KEY_EXCH_A:
 491                 case SSL3_ST_SR_KEY_EXCH_B:
 492                         ret=ssl3_get_client_key_exchange(s);
 493                         if (ret <= 0)
 494                                 goto end;
 495                         if (ret == 2)
 496                                 {
 497                                 /* For the ECDH ciphersuites when
 498                                  * the client sends its ECDH pub key in
 499                                  * a certificate, the CertificateVerify
 500                                  * message is not sent.
 501                                  */
 502                                 s->state=SSL3_ST_SR_FINISHED_A;
 503                                 s->init_num = 0;
 504                                 }
 505                         else
 506                                 {
 507                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 508                                 s->init_num=0;
 509
 510                                 /* We need to get hashes here so if there is
 511                                  * a client cert, it can be verified
 512                                  */
 513                                 s->method->ssl3_enc->cert_verify_mac(s,
 514                                     &(s->s3->finish_dgst1),
 515                                     &(s->s3->tmp.cert_verify_md[0]));
 516                                 s->method->ssl3_enc->cert_verify_mac(s,
 517                                     &(s->s3->finish_dgst2),
 518                                     &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 519                                 }
 520                         break;
 521
 522                 case SSL3_ST_SR_CERT_VRFY_A:
 523                 case SSL3_ST_SR_CERT_VRFY_B:
 524
 525                         /* we should decide if we expected this one */
 526                         ret=ssl3_get_cert_verify(s);
 527                         if (ret <= 0) goto end;
 528
 529                         s->state=SSL3_ST_SR_FINISHED_A;
 530                         s->init_num=0;
 531                         break;
 532
 533                 case SSL3_ST_SR_FINISHED_A:
 534                 case SSL3_ST_SR_FINISHED_B:
 535                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 536                                 SSL3_ST_SR_FINISHED_B);
 537                         if (ret <= 0) goto end;
 538                         if (s->hit)
 539                                 s->state=SSL_ST_OK;
 540 #ifndef OPENSSL_NO_TLSEXT
 541                         else if (s->tlsext_ticket_expected)
 542                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 543 #endif
 544                         else
 545                                 s->state=SSL3_ST_SW_CHANGE_A;
 546                         s->init_num=0;
 547                         break;
 548
 549 #ifndef OPENSSL_NO_TLSEXT
 550                 case SSL3_ST_SW_SESSION_TICKET_A:
 551                 case SSL3_ST_SW_SESSION_TICKET_B:
 552                         ret=ssl3_send_newsession_ticket(s);
 553                         if (ret <= 0) goto end;
 554                         s->state=SSL3_ST_SW_CHANGE_A;
 555                         s->init_num=0;
 556                         break;
 557
 558                 case SSL3_ST_SW_CERT_STATUS_A:
 559                 case SSL3_ST_SW_CERT_STATUS_B:
 560                         ret=ssl3_send_cert_status(s);
 561                         if (ret <= 0) goto end;
 562                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 563                         s->init_num=0;
 564                         break;
 565
 566 #endif
 567
 568                 case SSL3_ST_SW_CHANGE_A:
 569                 case SSL3_ST_SW_CHANGE_B:
 570
 571                         s->session->cipher=s->s3->tmp.new_cipher;
 572                         if (!s->method->ssl3_enc->setup_key_block(s))
 573                                 { ret= -1; goto end; }
 574
 575                         ret=ssl3_send_change_cipher_spec(s,
 576                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 577
 578                         if (ret <= 0) goto end;
 579                         s->state=SSL3_ST_SW_FINISHED_A;
 580                         s->init_num=0;
 581
 582                         if (!s->method->ssl3_enc->change_cipher_state(s,
 583                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 584                                 {
 585                                 ret= -1;
 586                                 goto end;
 587                                 }
 588
 589                         break;
 590
 591                 case SSL3_ST_SW_FINISHED_A:
 592                 case SSL3_ST_SW_FINISHED_B:
 593                         ret=ssl3_send_finished(s,
 594                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 595                                 s->method->ssl3_enc->server_finished_label,
 596                                 s->method->ssl3_enc->server_finished_label_len);
 597                         if (ret <= 0) goto end;
 598                         s->state=SSL3_ST_SW_FLUSH;
 599                         if (s->hit)
 600                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 601                         else
 602                                 s->s3->tmp.next_state=SSL_ST_OK;
 603                         s->init_num=0;
 604                         break;
 605
 606                 case SSL_ST_OK:
 607                         /* clean a few things up */
 608                         ssl3_cleanup_key_block(s);
 609
 610                         BUF_MEM_free(s->init_buf);
 611                         s->init_buf=NULL;
 612
 613                         /* remove buffering on output */
 614                         ssl_free_wbio_buffer(s);
 615
 616                         s->init_num=0;
 617
 618                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 619                                 {
 620                                 /* actually not necessarily a 'new' session unless
 621                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 622
 623                                 s->new_session=0;
 624
 625                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 626
 627                                 s->ctx->stats.sess_accept_good++;
 628                                 /* s->server=1; */
 629                                 s->handshake_func=ssl3_accept;
 630
 631                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 632                                 }
 633
 634                         ret = 1;
 635                         goto end;
 636                         /* break; */
 637
 638                 default:
 639                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 640                         ret= -1;
 641                         goto end;
 642                         /* break; */
 643                         }
 644
 645                 if (!s->s3->tmp.reuse_message && !skip)
 646                         {
 647                         if (s->debug)
 648                                 {
 649                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 650                                         goto end;
 651                                 }
 652
 653
 654                         if ((cb != NULL) && (s->state != state))
 655                                 {
 656                                 new_state=s->state;
 657                                 s->state=state;
 658                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 659                                 s->state=new_state;
 660                                 }
 661                         }
 662                 skip=0;
 663                 }
 664 end:
 665         /* BIO_flush(s->wbio); */
 666
 667         s->in_handshake--;
 668         if (cb != NULL)
 669                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 670         return(ret);
 671         }
 672
 673 int ssl3_send_hello_request(SSL *s)
 674         {
 675         unsigned char *p;
 676
 677         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 678                 {
 679                 p=(unsigned char *)s->init_buf->data;
 680                 *(p++)=SSL3_MT_HELLO_REQUEST;
 681                 *(p++)=0;
 682                 *(p++)=0;
 683                 *(p++)=0;
 684
 685                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 686                 /* number of bytes to write */
 687                 s->init_num=4;
 688                 s->init_off=0;
 689                 }
 690
 691         /* SSL3_ST_SW_HELLO_REQ_B */
 692         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 693         }
 694
 695 int ssl3_check_client_hello(SSL *s)
 696         {
 697         int ok;
 698         long n;
 699
 700         /* this function is called when we really expect a Certificate message,
 701          * so permit appropriate message length */
 702         n=s->method->ssl_get_message(s,
 703                 SSL3_ST_SR_CERT_A,
 704                 SSL3_ST_SR_CERT_B,
 705                 -1,
 706                 s->max_cert_list,
 707                 &ok);
 708         if (!ok) return((int)n);
 709         s->s3->tmp.reuse_message = 1;
 710         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 711                 {
 712                 /* Throw away what we have done so far in the current handshake,
 713                  * which will now be aborted. (A full SSL_clear would be too much.)
 714                  * I hope that tmp.dh is the only thing that may need to be cleared
 715                  * when a handshake is not completed ... */
 716 #ifndef OPENSSL_NO_DH
 717                 if (s->s3->tmp.dh != NULL)
 718                         {
 719                         DH_free(s->s3->tmp.dh);
 720                         s->s3->tmp.dh = NULL;
 721                         }
 722 #endif
 723                 return 2;
 724                 }
 725         return 1;
 726 }
 727
 728 int ssl3_get_client_hello(SSL *s)
 729         {
 730         int i,j,ok,al,ret= -1;
 731         unsigned int cookie_len;
 732         long n;
 733         unsigned long id;
 734         unsigned char *p,*d,*q;
 735         SSL_CIPHER *c;
 736 #ifndef OPENSSL_NO_COMP
 737         SSL_COMP *comp=NULL;
 738 #endif
 739         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 740
 741         /* We do this so that we will respond with our native type.
 742          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 743          * This down switching should be handled by a different method.
 744          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 745          * TLSv1.
 746          */
 747         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 748                 {
 749                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 750                 }
 751         s->first_packet=1;
 752         n=s->method->ssl_get_message(s,
 753                 SSL3_ST_SR_CLNT_HELLO_B,
 754                 SSL3_ST_SR_CLNT_HELLO_C,
 755                 SSL3_MT_CLIENT_HELLO,
 756                 SSL3_RT_MAX_PLAIN_LENGTH,
 757                 &ok);
 758
 759         if (!ok) return((int)n);
 760         s->first_packet=0;
 761         d=p=(unsigned char *)s->init_msg;
 762
 763         /* use version from inside client hello, not from record header
 764          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 765         s->client_version=(((int)p[0])<<8)|(int)p[1];
 766         p+=2;
 767
 768         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 769             (s->version != DTLS1_VERSION && s->client_version < s->version))
 770                 {
 771                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 772                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 773                         {
 774                         /* similar to ssl3_get_record, send alert using remote version number */
 775                         s->version = s->client_version;
 776                         }
 777                 al = SSL_AD_PROTOCOL_VERSION;
 778                 goto f_err;
 779                 }
 780
 781         /* If we require cookies and this ClientHello doesn't
 782          * contain one, just return since we do not want to
 783          * allocate any memory yet. So check cookie length...
 784          */
 785         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
 786                 {
 787                 unsigned int session_length, cookie_length;
 788
 789                 session_length = *(p + SSL3_RANDOM_SIZE);
 790                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
 791
 792                 if (cookie_length == 0)
 793                         return 1;
 794                 }
 795
 796         /* load the client random */
 797         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 798         p+=SSL3_RANDOM_SIZE;
 799
 800         /* get the session-id */
 801         j= *(p++);
 802
 803         s->hit=0;
 804         /* Versions before 0.9.7 always allow session reuse during renegotiation
 805          * (i.e. when s->new_session is true), option
 806          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
 807          * Maybe this optional behaviour should always have been the default,
 808          * but we cannot safely change the default behaviour (or new applications
 809          * might be written that become totally unsecure when compiled with
 810          * an earlier library version)
 811          */
 812         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 813                 {
 814                 if (!ssl_get_new_session(s,1))
 815                         goto err;
 816                 }
 817         else
 818                 {
 819                 i=ssl_get_prev_session(s, p, j, d + n);
 820                 if (i == 1)
 821                         { /* previous session */
 822                         s->hit=1;
 823                         }
 824                 else if (i == -1)
 825                         goto err;
 826                 else /* i == 0 */
 827                         {
 828                         if (!ssl_get_new_session(s,1))
 829                                 goto err;
 830                         }
 831                 }
 832
 833         p+=j;
 834
 835         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
 836                 {
 837                 /* cookie stuff */
 838                 cookie_len = *(p++);
 839
 840                 /*
 841                  * The ClientHello may contain a cookie even if the
 842                  * HelloVerify message has not been sent--make sure that it
 843                  * does not cause an overflow.
 844                  */
 845                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
 846                         {
 847                         /* too much data */
 848                         al = SSL_AD_DECODE_ERROR;
 849                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 850                         goto f_err;
 851                         }
 852
 853                 /* verify the cookie if appropriate option is set. */
 854                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 855                         cookie_len > 0)
 856                         {
 857                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
 858
 859                         if ( s->ctx->app_verify_cookie_cb != NULL)
 860                                 {
 861                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
 862                                         cookie_len) == 0)
 863                                         {
 864                                         al=SSL_AD_HANDSHAKE_FAILURE;
 865                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 866                                                 SSL_R_COOKIE_MISMATCH);
 867                                         goto f_err;
 868                                         }
 869                                 /* else cookie verification succeeded */
 870                                 }
 871                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
 872                                                   s->d1->cookie_len) != 0) /* default verification */
 873                                 {
 874                                         al=SSL_AD_HANDSHAKE_FAILURE;
 875                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 876                                                 SSL_R_COOKIE_MISMATCH);
 877                                         goto f_err;
 878                                 }
 879
 880                         ret = 2;
 881                         }
 882
 883                 p += cookie_len;
 884                 }
 885
 886         n2s(p,i);
 887         if ((i == 0) && (j != 0))
 888                 {
 889                 /* we need a cipher if we are not resuming a session */
 890                 al=SSL_AD_ILLEGAL_PARAMETER;
 891                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 892                 goto f_err;
 893                 }
 894         if ((p+i) >= (d+n))
 895                 {
 896                 /* not enough data */
 897                 al=SSL_AD_DECODE_ERROR;
 898                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 899                 goto f_err;
 900                 }
 901         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 902                 == NULL))
 903                 {
 904                 goto err;
 905                 }
 906         p+=i;
 907
 908         /* If it is a hit, check that the cipher is in the list */
 909         if ((s->hit) && (i > 0))
 910                 {
 911                 j=0;
 912                 id=s->session->cipher->id;
 913
 914 #ifdef CIPHER_DEBUG
 915                 printf("client sent %d ciphers\n",sk_num(ciphers));
 916 #endif
 917                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 918                         {
 919                         c=sk_SSL_CIPHER_value(ciphers,i);
 920 #ifdef CIPHER_DEBUG
 921                         printf("client [%2d of %2d]:%s\n",
 922                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 923 #endif
 924                         if (c->id == id)
 925                                 {
 926                                 j=1;
 927                                 break;
 928                                 }
 929                         }
 930 /* Disabled because it can be used in a ciphersuite downgrade
 931  * attack: CVE-2010-4180.
 932  */
 933 #if 0
 934                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 935                         {
 936                         /* Special case as client bug workaround: the previously used cipher may
 937                          * not be in the current list, the client instead might be trying to
 938                          * continue using a cipher that before wasn't chosen due to server
 939                          * preferences.  We'll have to reject the connection if the cipher is not
 940                          * enabled, though. */
 941                         c = sk_SSL_CIPHER_value(ciphers, 0);
 942                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
 943                                 {
 944                                 s->session->cipher = c;
 945                                 j = 1;
 946                                 }
 947                         }
 948 #endif
 949                 if (j == 0)
 950                         {
 951                         /* we need to have the cipher in the cipher
 952                          * list if we are asked to reuse it */
 953                         al=SSL_AD_ILLEGAL_PARAMETER;
 954                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 955                         goto f_err;
 956                         }
 957                 }
 958
 959         /* compression */
 960         i= *(p++);
 961         if ((p+i) > (d+n))
 962                 {
 963                 /* not enough data */
 964                 al=SSL_AD_DECODE_ERROR;
 965                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 966                 goto f_err;
 967                 }
 968         q=p;
 969         for (j=0; j<i; j++)
 970                 {
 971                 if (p[j] == 0) break;
 972                 }
 973
 974         p+=i;
 975         if (j >= i)
 976                 {
 977                 /* no compress */
 978                 al=SSL_AD_DECODE_ERROR;
 979                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 980                 goto f_err;
 981                 }
 982
 983 #ifndef OPENSSL_NO_TLSEXT
 984         /* TLS extensions*/
 985         if (s->version >= SSL3_VERSION)
 986                 {
 987                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
 988                         {
 989                         /* 'al' set by ssl_parse_clienthello_tlsext */
 990                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
 991                         goto f_err;
 992                         }
 993                 }
 994                 if (ssl_check_clienthello_tlsext(s) <= 0) {
 995                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 996                         goto err;
 997                 }
 998 #endif
 999         /* Worst case, we will use the NULL compression, but if we have other
1000          * options, we will now look for them.  We have i-1 compression
1001          * algorithms from the client, starting at q. */
1002         s->s3->tmp.new_compression=NULL;
1003 #ifndef OPENSSL_NO_COMP
1004         if (s->ctx->comp_methods != NULL)
1005                 { /* See if we have a match */
1006                 int m,nn,o,v,done=0;
1007
1008                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1009                 for (m=0; m<nn; m++)
1010                         {
1011                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1012                         v=comp->id;
1013                         for (o=0; o<i; o++)
1014                                 {
1015                                 if (v == q[o])
1016                                         {
1017                                         done=1;
1018                                         break;
1019                                         }
1020                                 }
1021                         if (done) break;
1022                         }
1023                 if (done)
1024                         s->s3->tmp.new_compression=comp;
1025                 else
1026                         comp=NULL;
1027                 }
1028 #endif
1029
1030         /* TLS does not mind if there is extra stuff */
1031 #if 0   /* SSL 3.0 does not mind either, so we should disable this test
1032          * (was enabled in 0.9.6d through 0.9.6j and 0.9.7 through 0.9.7b,
1033          * in earlier SSLeay/OpenSSL releases this test existed but was buggy) */
1034         if (s->version == SSL3_VERSION)
1035                 {
1036                 if (p < (d+n))
1037                         {
1038                         /* wrong number of bytes,
1039                          * there could be more to follow */
1040                         al=SSL_AD_DECODE_ERROR;
1041                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1042                         goto f_err;
1043                         }
1044                 }
1045 #endif
1046
1047         /* Given s->session->ciphers and SSL_get_ciphers, we must
1048          * pick a cipher */
1049
1050         if (!s->hit)
1051                 {
1052 #ifdef OPENSSL_NO_COMP
1053                 s->session->compress_meth=0;
1054 #else
1055                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1056 #endif
1057                 if (s->session->ciphers != NULL)
1058                         sk_SSL_CIPHER_free(s->session->ciphers);
1059                 s->session->ciphers=ciphers;
1060                 if (ciphers == NULL)
1061                         {
1062                         al=SSL_AD_ILLEGAL_PARAMETER;
1063                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1064                         goto f_err;
1065                         }
1066                 ciphers=NULL;
1067                 c=ssl3_choose_cipher(s,s->session->ciphers,
1068                                      SSL_get_ciphers(s));
1069
1070                 if (c == NULL)
1071                         {
1072                         al=SSL_AD_HANDSHAKE_FAILURE;
1073                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1074                         goto f_err;
1075                         }
1076                 s->s3->tmp.new_cipher=c;
1077                 }
1078         else
1079                 {
1080                 /* Session-id reuse */
1081 #ifdef REUSE_CIPHER_BUG
1082                 STACK_OF(SSL_CIPHER) *sk;
1083                 SSL_CIPHER *nc=NULL;
1084                 SSL_CIPHER *ec=NULL;
1085
1086                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1087                         {
1088                         sk=s->session->ciphers;
1089                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1090                                 {
1091                                 c=sk_SSL_CIPHER_value(sk,i);
1092                                 if (c->algorithms & SSL_eNULL)
1093                                         nc=c;
1094                                 if (SSL_C_IS_EXPORT(c))
1095                                         ec=c;
1096                                 }
1097                         if (nc != NULL)
1098                                 s->s3->tmp.new_cipher=nc;
1099                         else if (ec != NULL)
1100                                 s->s3->tmp.new_cipher=ec;
1101                         else
1102                                 s->s3->tmp.new_cipher=s->session->cipher;
1103                         }
1104                 else
1105 #endif
1106                 s->s3->tmp.new_cipher=s->session->cipher;
1107                 }
1108
1109         /* we now have the following setup.
1110          * client_random
1111          * cipher_list          - our prefered list of ciphers
1112          * ciphers              - the clients prefered list of ciphers
1113          * compression          - basically ignored right now
1114          * ssl version is set   - sslv3
1115          * s->session           - The ssl session has been setup.
1116          * s->hit               - session reuse flag
1117          * s->tmp.new_cipher    - the new cipher to use.
1118          */
1119
1120         if (ret < 0) ret=1;
1121         if (0)
1122                 {
1123 f_err:
1124                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1125                 }
1126 err:
1127         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1128         return(ret);
1129         }
1130
1131 int ssl3_send_server_hello(SSL *s)
1132         {
1133         unsigned char *buf;
1134         unsigned char *p,*d;
1135         int i,sl;
1136         unsigned long l,Time;
1137
1138         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1139                 {
1140                 buf=(unsigned char *)s->init_buf->data;
1141                 p=s->s3->server_random;
1142                 Time=(unsigned long)time(NULL);                 /* Time */
1143                 l2n(Time,p);
1144                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1145                         return -1;
1146                 /* Do the message type and length last */
1147                 d=p= &(buf[4]);
1148
1149                 *(p++)=s->version>>8;
1150                 *(p++)=s->version&0xff;
1151
1152                 /* Random stuff */
1153                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1154                 p+=SSL3_RANDOM_SIZE;
1155
1156                 /* now in theory we have 3 options to sending back the
1157                  * session id.  If it is a re-use, we send back the
1158                  * old session-id, if it is a new session, we send
1159                  * back the new session-id or we send back a 0 length
1160                  * session-id if we want it to be single use.
1161                  * Currently I will not implement the '0' length session-id
1162                  * 12-Jan-98 - I'll now support the '0' length stuff.
1163                  *
1164                  * We also have an additional case where stateless session
1165                  * resumption is successful: we always send back the old
1166                  * session id. In this case s->hit is non zero: this can
1167                  * only happen if stateless session resumption is succesful
1168                  * if session caching is disabled so existing functionality
1169                  * is unaffected.
1170                  */
1171                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1172                         && !s->hit)
1173                         s->session->session_id_length=0;
1174
1175                 sl=s->session->session_id_length;
1176                 if (sl > (int)sizeof(s->session->session_id))
1177                         {
1178                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1179                         return -1;
1180                         }
1181                 *(p++)=sl;
1182                 memcpy(p,s->session->session_id,sl);
1183                 p+=sl;
1184
1185                 /* put the cipher */
1186                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1187                 p+=i;
1188
1189                 /* put the compression method */
1190 #ifdef OPENSSL_NO_COMP
1191                         *(p++)=0;
1192 #else
1193                 if (s->s3->tmp.new_compression == NULL)
1194                         *(p++)=0;
1195                 else
1196                         *(p++)=s->s3->tmp.new_compression->id;
1197 #endif
1198 #ifndef OPENSSL_NO_TLSEXT
1199                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1200                         {
1201                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1202                         return -1;
1203                         }
1204 #endif
1205                 /* do the header */
1206                 l=(p-d);
1207                 d=buf;
1208                 *(d++)=SSL3_MT_SERVER_HELLO;
1209                 l2n3(l,d);
1210
1211                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1212                 /* number of bytes to write */
1213                 s->init_num=p-buf;
1214                 s->init_off=0;
1215                 }
1216
1217         /* SSL3_ST_SW_SRVR_HELLO_B */
1218         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1219         }
1220
1221 int ssl3_send_server_done(SSL *s)
1222         {
1223         unsigned char *p;
1224
1225         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1226                 {
1227                 p=(unsigned char *)s->init_buf->data;
1228
1229                 /* do the header */
1230                 *(p++)=SSL3_MT_SERVER_DONE;
1231                 *(p++)=0;
1232                 *(p++)=0;
1233                 *(p++)=0;
1234
1235                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1236                 /* number of bytes to write */
1237                 s->init_num=4;
1238                 s->init_off=0;
1239                 }
1240
1241         /* SSL3_ST_SW_SRVR_DONE_B */
1242         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1243         }
1244
1245 int ssl3_send_server_key_exchange(SSL *s)
1246         {
1247 #ifndef OPENSSL_NO_RSA
1248         unsigned char *q;
1249         int j,num;
1250         RSA *rsa;
1251         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1252         unsigned int u;
1253 #endif
1254 #ifndef OPENSSL_NO_DH
1255         DH *dh=NULL,*dhp;
1256 #endif
1257 #ifndef OPENSSL_NO_ECDH
1258         EC_KEY *ecdh=NULL, *ecdhp;
1259         unsigned char *encodedPoint = NULL;
1260         int encodedlen = 0;
1261         int curve_id = 0;
1262         BN_CTX *bn_ctx = NULL;
1263 #endif
1264         EVP_PKEY *pkey;
1265         unsigned char *p,*d;
1266         int al,i;
1267         unsigned long type;
1268         int n;
1269         CERT *cert;
1270         BIGNUM *r[4];
1271         int nr[4],kn;
1272         BUF_MEM *buf;
1273         EVP_MD_CTX md_ctx;
1274
1275         EVP_MD_CTX_init(&md_ctx);
1276         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1277                 {
1278                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1279                 cert=s->cert;
1280
1281                 buf=s->init_buf;
1282
1283                 r[0]=r[1]=r[2]=r[3]=NULL;
1284                 n=0;
1285 #ifndef OPENSSL_NO_RSA
1286                 if (type & SSL_kRSA)
1287                         {
1288                         rsa=cert->rsa_tmp;
1289                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1290                                 {
1291                                 rsa=s->cert->rsa_tmp_cb(s,
1292                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1293                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1294                                 if(rsa == NULL)
1295                                 {
1296                                         al=SSL_AD_HANDSHAKE_FAILURE;
1297                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1298                                         goto f_err;
1299                                 }
1300                                 RSA_up_ref(rsa);
1301                                 cert->rsa_tmp=rsa;
1302                                 }
1303                         if (rsa == NULL)
1304                                 {
1305                                 al=SSL_AD_HANDSHAKE_FAILURE;
1306                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1307                                 goto f_err;
1308                                 }
1309                         r[0]=rsa->n;
1310                         r[1]=rsa->e;
1311                         s->s3->tmp.use_rsa_tmp=1;
1312                         }
1313                 else
1314 #endif
1315 #ifndef OPENSSL_NO_DH
1316                         if (type & SSL_kEDH)
1317                         {
1318                         dhp=cert->dh_tmp;
1319                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1320                                 dhp=s->cert->dh_tmp_cb(s,
1321                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1322                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1323                         if (dhp == NULL)
1324                                 {
1325                                 al=SSL_AD_HANDSHAKE_FAILURE;
1326                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1327                                 goto f_err;
1328                                 }
1329
1330                         if (s->s3->tmp.dh != NULL)
1331                                 {
1332                                 DH_free(dh);
1333                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1334                                 goto err;
1335                                 }
1336
1337                         if ((dh=DHparams_dup(dhp)) == NULL)
1338                                 {
1339                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1340                                 goto err;
1341                                 }
1342
1343                         s->s3->tmp.dh=dh;
1344                         if ((dhp->pub_key == NULL ||
1345                              dhp->priv_key == NULL ||
1346                              (s->options & SSL_OP_SINGLE_DH_USE)))
1347                                 {
1348                                 if(!DH_generate_key(dh))
1349                                     {
1350                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1351                                            ERR_R_DH_LIB);
1352                                     goto err;
1353                                     }
1354                                 }
1355                         else
1356                                 {
1357                                 dh->pub_key=BN_dup(dhp->pub_key);
1358                                 dh->priv_key=BN_dup(dhp->priv_key);
1359                                 if ((dh->pub_key == NULL) ||
1360                                         (dh->priv_key == NULL))
1361                                         {
1362                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1363                                         goto err;
1364                                         }
1365                                 }
1366                         r[0]=dh->p;
1367                         r[1]=dh->g;
1368                         r[2]=dh->pub_key;
1369                         }
1370                 else
1371 #endif
1372 #ifndef OPENSSL_NO_ECDH
1373                         if (type & SSL_kECDHE)
1374                         {
1375                         const EC_GROUP *group;
1376
1377                         ecdhp=cert->ecdh_tmp;
1378                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1379                                 {
1380                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1381                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1382                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1383                                 }
1384                         if (ecdhp == NULL)
1385                                 {
1386                                 al=SSL_AD_HANDSHAKE_FAILURE;
1387                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1388                                 goto f_err;
1389                                 }
1390
1391                         if (s->s3->tmp.ecdh != NULL)
1392                                 {
1393                                 EC_KEY_free(s->s3->tmp.ecdh);
1394                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1395                                 goto err;
1396                                 }
1397
1398                         /* Duplicate the ECDH structure. */
1399                         if (ecdhp == NULL)
1400                                 {
1401                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1402                                 goto err;
1403                                 }
1404                         if (!EC_KEY_up_ref(ecdhp))
1405                                 {
1406                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1407                                 goto err;
1408                                 }
1409                         ecdh = ecdhp;
1410
1411                         s->s3->tmp.ecdh=ecdh;
1412                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1413                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1414                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1415                                 {
1416                                 if(!EC_KEY_generate_key(ecdh))
1417                                     {
1418                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1419                                     goto err;
1420                                     }
1421                                 }
1422
1423                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1424                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1425                             (EC_KEY_get0_private_key(ecdh) == NULL))
1426                                 {
1427                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1428                                 goto err;
1429                                 }
1430
1431                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1432                             (EC_GROUP_get_degree(group) > 163))
1433                                 {
1434                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1435                                 goto err;
1436                                 }
1437
1438                         /* XXX: For now, we only support ephemeral ECDH
1439                          * keys over named (not generic) curves. For
1440                          * supported named curves, curve_id is non-zero.
1441                          */
1442                         if ((curve_id =
1443                             nid2curve_id(EC_GROUP_get_curve_name(group)))
1444                             == 0)
1445                                 {
1446                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1447                                 goto err;
1448                                 }
1449
1450                         /* Encode the public key.
1451                          * First check the size of encoding and
1452                          * allocate memory accordingly.
1453                          */
1454                         encodedlen = EC_POINT_point2oct(group,
1455                             EC_KEY_get0_public_key(ecdh),
1456                             POINT_CONVERSION_UNCOMPRESSED,
1457                             NULL, 0, NULL);
1458
1459                         encodedPoint = (unsigned char *)
1460                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1461                         bn_ctx = BN_CTX_new();
1462                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1463                                 {
1464                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1465                                 goto err;
1466                                 }
1467
1468
1469                         encodedlen = EC_POINT_point2oct(group,
1470                             EC_KEY_get0_public_key(ecdh),
1471                             POINT_CONVERSION_UNCOMPRESSED,
1472                             encodedPoint, encodedlen, bn_ctx);
1473
1474                         if (encodedlen == 0)
1475                                 {
1476                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1477                                 goto err;
1478                                 }
1479
1480                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1481
1482                         /* XXX: For now, we only support named (not
1483                          * generic) curves in ECDH ephemeral key exchanges.
1484                          * In this situation, we need four additional bytes
1485                          * to encode the entire ServerECDHParams
1486                          * structure.
1487                          */
1488                         n = 4 + encodedlen;
1489
1490                         /* We'll generate the serverKeyExchange message
1491                          * explicitly so we can set these to NULLs
1492                          */
1493                         r[0]=NULL;
1494                         r[1]=NULL;
1495                         r[2]=NULL;
1496                         r[3]=NULL;
1497                         }
1498                 else
1499 #endif /* !OPENSSL_NO_ECDH */
1500                         {
1501                         al=SSL_AD_HANDSHAKE_FAILURE;
1502                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1503                         goto f_err;
1504                         }
1505                 for (i=0; r[i] != NULL; i++)
1506                         {
1507                         nr[i]=BN_num_bytes(r[i]);
1508                         n+=2+nr[i];
1509                         }
1510
1511                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1512                         {
1513                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1514                                 == NULL)
1515                                 {
1516                                 al=SSL_AD_DECODE_ERROR;
1517                                 goto f_err;
1518                                 }
1519                         kn=EVP_PKEY_size(pkey);
1520                         }
1521                 else
1522                         {
1523                         pkey=NULL;
1524                         kn=0;
1525                         }
1526
1527                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1528                         {
1529                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1530                         goto err;
1531                         }
1532                 d=(unsigned char *)s->init_buf->data;
1533                 p= &(d[4]);
1534
1535                 for (i=0; r[i] != NULL; i++)
1536                         {
1537                         s2n(nr[i],p);
1538                         BN_bn2bin(r[i],p);
1539                         p+=nr[i];
1540                         }
1541
1542 #ifndef OPENSSL_NO_ECDH
1543                 if (type & SSL_kECDHE)
1544                         {
1545                         /* XXX: For now, we only support named (not generic) curves.
1546                          * In this situation, the serverKeyExchange message has:
1547                          * [1 byte CurveType], [2 byte CurveName]
1548                          * [1 byte length of encoded point], followed by
1549                          * the actual encoded point itself
1550                          */
1551                         *p = NAMED_CURVE_TYPE;
1552                         p += 1;
1553                         *p = 0;
1554                         p += 1;
1555                         *p = curve_id;
1556                         p += 1;
1557                         *p = encodedlen;
1558                         p += 1;
1559                         memcpy((unsigned char*)p,
1560                             (unsigned char *)encodedPoint,
1561                             encodedlen);
1562                         OPENSSL_free(encodedPoint);
1563                         encodedPoint = NULL;
1564                         p += encodedlen;
1565                         }
1566 #endif
1567
1568                 /* not anonymous */
1569                 if (pkey != NULL)
1570                         {
1571                         /* n is the length of the params, they start at &(d[4])
1572                          * and p points to the space at the end. */
1573 #ifndef OPENSSL_NO_RSA
1574                         if (pkey->type == EVP_PKEY_RSA)
1575                                 {
1576                                 q=md_buf;
1577                                 j=0;
1578                                 for (num=2; num > 0; num--)
1579                                         {
1580                                         EVP_MD_CTX_set_flags(&md_ctx,
1581                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1582                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1583                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1584                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1585                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1586                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1587                                         EVP_DigestFinal_ex(&md_ctx,q,
1588                                                 (unsigned int *)&i);
1589                                         q+=i;
1590                                         j+=i;
1591                                         }
1592                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1593                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1594                                         {
1595                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1596                                         goto err;
1597                                         }
1598                                 s2n(u,p);
1599                                 n+=u+2;
1600                                 }
1601                         else
1602 #endif
1603 #if !defined(OPENSSL_NO_DSA)
1604                                 if (pkey->type == EVP_PKEY_DSA)
1605                                 {
1606                                 /* lets do DSS */
1607                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1608                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1609                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1610                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1611                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1612                                         (unsigned int *)&i,pkey))
1613                                         {
1614                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1615                                         goto err;
1616                                         }
1617                                 s2n(i,p);
1618                                 n+=i+2;
1619                                 }
1620                         else
1621 #endif
1622 #if !defined(OPENSSL_NO_ECDSA)
1623                                 if (pkey->type == EVP_PKEY_EC)
1624                                 {
1625                                 /* let's do ECDSA */
1626                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1627                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1628                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1629                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1630                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1631                                         (unsigned int *)&i,pkey))
1632                                         {
1633                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1634                                         goto err;
1635                                         }
1636                                 s2n(i,p);
1637                                 n+=i+2;
1638                                 }
1639                         else
1640 #endif
1641                                 {
1642                                 /* Is this error check actually needed? */
1643                                 al=SSL_AD_HANDSHAKE_FAILURE;
1644                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1645                                 goto f_err;
1646                                 }
1647                         }
1648
1649                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1650                 l2n3(n,d);
1651
1652                 /* we should now have things packed up, so lets send
1653                  * it off */
1654                 s->init_num=n+4;
1655                 s->init_off=0;
1656                 }
1657
1658         s->state = SSL3_ST_SW_KEY_EXCH_B;
1659         EVP_MD_CTX_cleanup(&md_ctx);
1660         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1661 f_err:
1662         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1663 err:
1664 #ifndef OPENSSL_NO_ECDH
1665         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1666         BN_CTX_free(bn_ctx);
1667 #endif
1668         EVP_MD_CTX_cleanup(&md_ctx);
1669         return(-1);
1670         }
1671
1672 int ssl3_send_certificate_request(SSL *s)
1673         {
1674         unsigned char *p,*d;
1675         int i,j,nl,off,n;
1676         STACK_OF(X509_NAME) *sk=NULL;
1677         X509_NAME *name;
1678         BUF_MEM *buf;
1679
1680         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1681                 {
1682                 buf=s->init_buf;
1683
1684                 d=p=(unsigned char *)&(buf->data[4]);
1685
1686                 /* get the list of acceptable cert types */
1687                 p++;
1688                 n=ssl3_get_req_cert_type(s,p);
1689                 d[0]=n;
1690                 p+=n;
1691                 n++;
1692
1693                 off=n;
1694                 p+=2;
1695                 n+=2;
1696
1697                 sk=SSL_get_client_CA_list(s);
1698                 nl=0;
1699                 if (sk != NULL)
1700                         {
1701                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1702                                 {
1703                                 name=sk_X509_NAME_value(sk,i);
1704                                 j=i2d_X509_NAME(name,NULL);
1705                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1706                                         {
1707                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1708                                         goto err;
1709                                         }
1710                                 p=(unsigned char *)&(buf->data[4+n]);
1711                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1712                                         {
1713                                         s2n(j,p);
1714                                         i2d_X509_NAME(name,&p);
1715                                         n+=2+j;
1716                                         nl+=2+j;
1717                                         }
1718                                 else
1719                                         {
1720                                         d=p;
1721                                         i2d_X509_NAME(name,&p);
1722                                         j-=2; s2n(j,d); j+=2;
1723                                         n+=j;
1724                                         nl+=j;
1725                                         }
1726                                 }
1727                         }
1728                 /* else no CA names */
1729                 p=(unsigned char *)&(buf->data[4+off]);
1730                 s2n(nl,p);
1731
1732                 d=(unsigned char *)buf->data;
1733                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1734                 l2n3(n,d);
1735
1736                 /* we should now have things packed up, so lets send
1737                  * it off */
1738
1739                 s->init_num=n+4;
1740                 s->init_off=0;
1741 #ifdef NETSCAPE_HANG_BUG
1742                 p=(unsigned char *)s->init_buf->data + s->init_num;
1743
1744                 /* do the header */
1745                 *(p++)=SSL3_MT_SERVER_DONE;
1746                 *(p++)=0;
1747                 *(p++)=0;
1748                 *(p++)=0;
1749                 s->init_num += 4;
1750 #endif
1751
1752                 s->state = SSL3_ST_SW_CERT_REQ_B;
1753                 }
1754
1755         /* SSL3_ST_SW_CERT_REQ_B */
1756         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1757 err:
1758         return(-1);
1759         }
1760
1761 int ssl3_get_client_key_exchange(SSL *s)
1762         {
1763         int i,al,ok;
1764         long n;
1765         unsigned long l;
1766         unsigned char *p;
1767 #ifndef OPENSSL_NO_RSA
1768         RSA *rsa=NULL;
1769         EVP_PKEY *pkey=NULL;
1770 #endif
1771 #ifndef OPENSSL_NO_DH
1772         BIGNUM *pub=NULL;
1773         DH *dh_srvr;
1774 #endif
1775 #ifndef OPENSSL_NO_KRB5
1776         KSSL_ERR kssl_err;
1777 #endif /* OPENSSL_NO_KRB5 */
1778
1779 #ifndef OPENSSL_NO_ECDH
1780         EC_KEY *srvr_ecdh = NULL;
1781         EVP_PKEY *clnt_pub_pkey = NULL;
1782         EC_POINT *clnt_ecpoint = NULL;
1783         BN_CTX *bn_ctx = NULL;
1784 #endif
1785
1786         n=s->method->ssl_get_message(s,
1787                 SSL3_ST_SR_KEY_EXCH_A,
1788                 SSL3_ST_SR_KEY_EXCH_B,
1789                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1790                 2048, /* ??? */
1791                 &ok);
1792
1793         if (!ok) return((int)n);
1794         p=(unsigned char *)s->init_msg;
1795
1796         l=s->s3->tmp.new_cipher->algorithms;
1797
1798 #ifndef OPENSSL_NO_RSA
1799         if (l & SSL_kRSA)
1800                 {
1801                 /* FIX THIS UP EAY EAY EAY EAY */
1802                 if (s->s3->tmp.use_rsa_tmp)
1803                         {
1804                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1805                                 rsa=s->cert->rsa_tmp;
1806                         /* Don't do a callback because rsa_tmp should
1807                          * be sent already */
1808                         if (rsa == NULL)
1809                                 {
1810                                 al=SSL_AD_HANDSHAKE_FAILURE;
1811                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1812                                 goto f_err;
1813
1814                                 }
1815                         }
1816                 else
1817                         {
1818                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1819                         if (    (pkey == NULL) ||
1820                                 (pkey->type != EVP_PKEY_RSA) ||
1821                                 (pkey->pkey.rsa == NULL))
1822                                 {
1823                                 al=SSL_AD_HANDSHAKE_FAILURE;
1824                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1825                                 goto f_err;
1826                                 }
1827                         rsa=pkey->pkey.rsa;
1828                         }
1829
1830                 /* TLS and [incidentally] DTLS, including pre-0.9.8f */
1831                 if (s->version > SSL3_VERSION &&
1832                     s->client_version != DTLS1_BAD_VER)
1833                         {
1834                         n2s(p,i);
1835                         if (n != i+2)
1836                                 {
1837                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1838                                         {
1839                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1840                                         goto err;
1841                                         }
1842                                 else
1843                                         p-=2;
1844                                 }
1845                         else
1846                                 n=i;
1847                         }
1848
1849                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1850
1851                 al = -1;
1852
1853                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1854                         {
1855                         al=SSL_AD_DECODE_ERROR;
1856                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
1857                         }
1858
1859                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1860                         {
1861                         /* The premaster secret must contain the same version number as the
1862                          * ClientHello to detect version rollback attacks (strangely, the
1863                          * protocol does not offer such protection for DH ciphersuites).
1864                          * However, buggy clients exist that send the negotiated protocol
1865                          * version instead if the server does not support the requested
1866                          * protocol version.
1867                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1868                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1869                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1870                                 {
1871                                 al=SSL_AD_DECODE_ERROR;
1872                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1873
1874                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1875                                  * (http://eprint.iacr.org/2003/052/) exploits the version
1876                                  * number check as a "bad version oracle" -- an alert would
1877                                  * reveal that the plaintext corresponding to some ciphertext
1878                                  * made up by the adversary is properly formatted except
1879                                  * that the version number is wrong.  To avoid such attacks,
1880                                  * we should treat this just like any other decryption error. */
1881                                 }
1882                         }
1883
1884                 if (al != -1)
1885                         {
1886                         /* Some decryption failure -- use random value instead as countermeasure
1887                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1888                          * (see RFC 2246, section 7.4.7.1). */
1889                         ERR_clear_error();
1890                         i = SSL_MAX_MASTER_KEY_LENGTH;
1891                         p[0] = s->client_version >> 8;
1892                         p[1] = s->client_version & 0xff;
1893                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
1894                                 goto err;
1895                         }
1896
1897                 s->session->master_key_length=
1898                         s->method->ssl3_enc->generate_master_secret(s,
1899                                 s->session->master_key,
1900                                 p,i);
1901                 OPENSSL_cleanse(p,i);
1902                 }
1903         else
1904 #endif
1905 #ifndef OPENSSL_NO_DH
1906                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1907                 {
1908                 n2s(p,i);
1909                 if (n != i+2)
1910                         {
1911                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1912                                 {
1913                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1914                                 goto err;
1915                                 }
1916                         else
1917                                 {
1918                                 p-=2;
1919                                 i=(int)n;
1920                                 }
1921                         }
1922
1923                 if (n == 0L) /* the parameters are in the cert */
1924                         {
1925                         al=SSL_AD_HANDSHAKE_FAILURE;
1926                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1927                         goto f_err;
1928                         }
1929                 else
1930                         {
1931                         if (s->s3->tmp.dh == NULL)
1932                                 {
1933                                 al=SSL_AD_HANDSHAKE_FAILURE;
1934                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1935                                 goto f_err;
1936                                 }
1937                         else
1938                                 dh_srvr=s->s3->tmp.dh;
1939                         }
1940
1941                 pub=BN_bin2bn(p,i,NULL);
1942                 if (pub == NULL)
1943                         {
1944                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1945                         goto err;
1946                         }
1947
1948                 i=DH_compute_key(p,pub,dh_srvr);
1949
1950                 if (i <= 0)
1951                         {
1952                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1953                         goto err;
1954                         }
1955
1956                 DH_free(s->s3->tmp.dh);
1957                 s->s3->tmp.dh=NULL;
1958
1959                 BN_clear_free(pub);
1960                 pub=NULL;
1961                 s->session->master_key_length=
1962                         s->method->ssl3_enc->generate_master_secret(s,
1963                                 s->session->master_key,p,i);
1964                 OPENSSL_cleanse(p,i);
1965                 }
1966         else
1967 #endif
1968 #ifndef OPENSSL_NO_KRB5
1969         if (l & SSL_kKRB5)
1970                 {
1971                 krb5_error_code         krb5rc;
1972                 krb5_data               enc_ticket;
1973                 krb5_data               authenticator;
1974                 krb5_data               enc_pms;
1975                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
1976                 EVP_CIPHER_CTX          ciph_ctx;
1977                 EVP_CIPHER              *enc = NULL;
1978                 unsigned char           iv[EVP_MAX_IV_LENGTH];
1979                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
1980                                                + EVP_MAX_BLOCK_LENGTH];
1981                 int                     padl, outl;
1982                 krb5_timestamp          authtime = 0;
1983                 krb5_ticket_times       ttimes;
1984
1985                 EVP_CIPHER_CTX_init(&ciph_ctx);
1986
1987                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
1988
1989                 n2s(p,i);
1990                 enc_ticket.length = i;
1991
1992                 if (n < (int)enc_ticket.length + 6)
1993                         {
1994                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1995                                 SSL_R_DATA_LENGTH_TOO_LONG);
1996                         goto err;
1997                         }
1998
1999                 enc_ticket.data = (char *)p;
2000                 p+=enc_ticket.length;
2001
2002                 n2s(p,i);
2003                 authenticator.length = i;
2004
2005                 if (n < (int)(enc_ticket.length + authenticator.length) + 6)
2006                         {
2007                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2008                                 SSL_R_DATA_LENGTH_TOO_LONG);
2009                         goto err;
2010                         }
2011
2012                 authenticator.data = (char *)p;
2013                 p+=authenticator.length;
2014
2015                 n2s(p,i);
2016                 enc_pms.length = i;
2017                 enc_pms.data = (char *)p;
2018                 p+=enc_pms.length;
2019
2020                 /* Note that the length is checked again below,
2021                 ** after decryption
2022                 */
2023                 if(enc_pms.length > sizeof pms)
2024                         {
2025                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2026                                SSL_R_DATA_LENGTH_TOO_LONG);
2027                         goto err;
2028                         }
2029
2030                 if (n != (long)(enc_ticket.length + authenticator.length +
2031                                                 enc_pms.length + 6))
2032                         {
2033                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2034                                 SSL_R_DATA_LENGTH_TOO_LONG);
2035                         goto err;
2036                         }
2037
2038                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2039                                         &kssl_err)) != 0)
2040                         {
2041 #ifdef KSSL_DEBUG
2042                         printf("kssl_sget_tkt rtn %d [%d]\n",
2043                                 krb5rc, kssl_err.reason);
2044                         if (kssl_err.text)
2045                                 printf("kssl_err text= %s\n", kssl_err.text);
2046 #endif  /* KSSL_DEBUG */
2047                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2048                                 kssl_err.reason);
2049                         goto err;
2050                         }
2051
2052                 /*  Note: no authenticator is not considered an error,
2053                 **  but will return authtime == 0.
2054                 */
2055                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2056                                         &authtime, &kssl_err)) != 0)
2057                         {
2058 #ifdef KSSL_DEBUG
2059                         printf("kssl_check_authent rtn %d [%d]\n",
2060                                 krb5rc, kssl_err.reason);
2061                         if (kssl_err.text)
2062                                 printf("kssl_err text= %s\n", kssl_err.text);
2063 #endif  /* KSSL_DEBUG */
2064                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2065                                 kssl_err.reason);
2066                         goto err;
2067                         }
2068
2069                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2070                         {
2071                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2072                         goto err;
2073                         }
2074
2075 #ifdef KSSL_DEBUG
2076                 kssl_ctx_show(kssl_ctx);
2077 #endif  /* KSSL_DEBUG */
2078
2079                 enc = kssl_map_enc(kssl_ctx->enctype);
2080                 if (enc == NULL)
2081                     goto err;
2082
2083                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2084
2085                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2086                         {
2087                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2088                                 SSL_R_DECRYPTION_FAILED);
2089                         goto err;
2090                         }
2091                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2092                                         (unsigned char *)enc_pms.data, enc_pms.length))
2093                         {
2094                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2095                                 SSL_R_DECRYPTION_FAILED);
2096                         goto err;
2097                         }
2098                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2099                         {
2100                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2101                                 SSL_R_DATA_LENGTH_TOO_LONG);
2102                         goto err;
2103                         }
2104                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2105                         {
2106                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2107                                 SSL_R_DECRYPTION_FAILED);
2108                         goto err;
2109                         }
2110                 outl += padl;
2111                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2112                         {
2113                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2114                                 SSL_R_DATA_LENGTH_TOO_LONG);
2115                         goto err;
2116                         }
2117                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2118                     {
2119                     /* The premaster secret must contain the same version number as the
2120                      * ClientHello to detect version rollback attacks (strangely, the
2121                      * protocol does not offer such protection for DH ciphersuites).
2122                      * However, buggy clients exist that send random bytes instead of
2123                      * the protocol version.
2124                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2125                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2126                      */
2127                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2128                         {
2129                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2130                                SSL_AD_DECODE_ERROR);
2131                         goto err;
2132                         }
2133                     }
2134
2135                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2136
2137                 s->session->master_key_length=
2138                         s->method->ssl3_enc->generate_master_secret(s,
2139                                 s->session->master_key, pms, outl);
2140
2141                 if (kssl_ctx->client_princ)
2142                         {
2143                         size_t len = strlen(kssl_ctx->client_princ);
2144                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2145                                 {
2146                                 s->session->krb5_client_princ_len = len;
2147                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2148                                 }
2149                         }
2150
2151
2152                 /*  Was doing kssl_ctx_free() here,
2153                 **  but it caused problems for apache.
2154                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2155                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2156                 */
2157                 }
2158         else
2159 #endif  /* OPENSSL_NO_KRB5 */
2160
2161 #ifndef OPENSSL_NO_ECDH
2162                 if ((l & SSL_kECDH) || (l & SSL_kECDHE))
2163                 {
2164                 int ret = 1;
2165                 int field_size = 0;
2166                 const EC_KEY   *tkey;
2167                 const EC_GROUP *group;
2168                 const BIGNUM *priv_key;
2169
2170                 /* initialize structures for server's ECDH key pair */
2171                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2172                         {
2173                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2174                             ERR_R_MALLOC_FAILURE);
2175                         goto err;
2176                         }
2177
2178                 /* Let's get server private key and group information */
2179                 if (l & SSL_kECDH)
2180                         {
2181                         /* use the certificate */
2182                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2183                         }
2184                 else
2185                         {
2186                         /* use the ephermeral values we saved when
2187                          * generating the ServerKeyExchange msg.
2188                          */
2189                         tkey = s->s3->tmp.ecdh;
2190                         }
2191
2192                 group    = EC_KEY_get0_group(tkey);
2193                 priv_key = EC_KEY_get0_private_key(tkey);
2194
2195                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2196                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2197                         {
2198                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2199                                ERR_R_EC_LIB);
2200                         goto err;
2201                         }
2202
2203                 /* Let's get client's public key */
2204                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2205                         {
2206                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2207                             ERR_R_MALLOC_FAILURE);
2208                         goto err;
2209                         }
2210
2211                 if (n == 0L)
2212                         {
2213                         /* Client Publickey was in Client Certificate */
2214
2215                          if (l & SSL_kECDHE)
2216                                  {
2217                                  al=SSL_AD_HANDSHAKE_FAILURE;
2218                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2219                                  goto f_err;
2220                                  }
2221                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2222                             == NULL) ||
2223                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2224                                 {
2225                                 /* XXX: For now, we do not support client
2226                                  * authentication using ECDH certificates
2227                                  * so this branch (n == 0L) of the code is
2228                                  * never executed. When that support is
2229                                  * added, we ought to ensure the key
2230                                  * received in the certificate is
2231                                  * authorized for key agreement.
2232                                  * ECDH_compute_key implicitly checks that
2233                                  * the two ECDH shares are for the same
2234                                  * group.
2235                                  */
2236                                 al=SSL_AD_HANDSHAKE_FAILURE;
2237                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2238                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2239                                 goto f_err;
2240                                 }
2241
2242                         if (EC_POINT_copy(clnt_ecpoint,
2243                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2244                                 {
2245                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2246                                         ERR_R_EC_LIB);
2247                                 goto err;
2248                                 }
2249                         ret = 2; /* Skip certificate verify processing */
2250                         }
2251                 else
2252                         {
2253                         /* Get client's public key from encoded point
2254                          * in the ClientKeyExchange message.
2255                          */
2256                         if ((bn_ctx = BN_CTX_new()) == NULL)
2257                                 {
2258                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2259                                     ERR_R_MALLOC_FAILURE);
2260                                 goto err;
2261                                 }
2262
2263                         /* Get encoded point length */
2264                         i = *p;
2265                         p += 1;
2266                         if (EC_POINT_oct2point(group,
2267                             clnt_ecpoint, p, i, bn_ctx) == 0)
2268                                 {
2269                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2270                                     ERR_R_EC_LIB);
2271                                 goto err;
2272                                 }
2273                         /* p is pointing to somewhere in the buffer
2274                          * currently, so set it to the start
2275                          */
2276                         p=(unsigned char *)s->init_buf->data;
2277                         }
2278
2279                 /* Compute the shared pre-master secret */
2280                 field_size = EC_GROUP_get_degree(group);
2281                 if (field_size <= 0)
2282                         {
2283                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2284                                ERR_R_ECDH_LIB);
2285                         goto err;
2286                         }
2287                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2288                 if (i <= 0)
2289                         {
2290                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2291                             ERR_R_ECDH_LIB);
2292                         goto err;
2293                         }
2294
2295                 EVP_PKEY_free(clnt_pub_pkey);
2296                 EC_POINT_free(clnt_ecpoint);
2297                 if (srvr_ecdh != NULL)
2298                         EC_KEY_free(srvr_ecdh);
2299                 BN_CTX_free(bn_ctx);
2300
2301                 /* Compute the master secret */
2302                 s->session->master_key_length = s->method->ssl3_enc-> \
2303                     generate_master_secret(s, s->session->master_key, p, i);
2304
2305                 OPENSSL_cleanse(p, i);
2306                 return (ret);
2307                 }
2308         else
2309 #endif
2310                 {
2311                 al=SSL_AD_HANDSHAKE_FAILURE;
2312                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2313                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2314                 goto f_err;
2315                 }
2316
2317         return(1);
2318 f_err:
2319         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2320 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2321 err:
2322 #endif
2323 #ifndef OPENSSL_NO_ECDH
2324         EVP_PKEY_free(clnt_pub_pkey);
2325         EC_POINT_free(clnt_ecpoint);
2326         if (srvr_ecdh != NULL)
2327                 EC_KEY_free(srvr_ecdh);
2328         BN_CTX_free(bn_ctx);
2329 #endif
2330         return(-1);
2331         }
2332
2333 int ssl3_get_cert_verify(SSL *s)
2334         {
2335         EVP_PKEY *pkey=NULL;
2336         unsigned char *p;
2337         int al,ok,ret=0;
2338         long n;
2339         int type=0,i,j;
2340         X509 *peer;
2341
2342         n=s->method->ssl_get_message(s,
2343                 SSL3_ST_SR_CERT_VRFY_A,
2344                 SSL3_ST_SR_CERT_VRFY_B,
2345                 -1,
2346                 514, /* 514? */
2347                 &ok);
2348
2349         if (!ok) return((int)n);
2350
2351         if (s->session->peer != NULL)
2352                 {
2353                 peer=s->session->peer;
2354                 pkey=X509_get_pubkey(peer);
2355                 type=X509_certificate_type(peer,pkey);
2356                 }
2357         else
2358                 {
2359                 peer=NULL;
2360                 pkey=NULL;
2361                 }
2362
2363         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2364                 {
2365                 s->s3->tmp.reuse_message=1;
2366                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2367                         {
2368                         al=SSL_AD_UNEXPECTED_MESSAGE;
2369                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2370                         goto f_err;
2371                         }
2372                 ret=1;
2373                 goto end;
2374                 }
2375
2376         if (peer == NULL)
2377                 {
2378                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2379                 al=SSL_AD_UNEXPECTED_MESSAGE;
2380                 goto f_err;
2381                 }
2382
2383         if (!(type & EVP_PKT_SIGN))
2384                 {
2385                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2386                 al=SSL_AD_ILLEGAL_PARAMETER;
2387                 goto f_err;
2388                 }
2389
2390         if (s->s3->change_cipher_spec)
2391                 {
2392                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2393                 al=SSL_AD_UNEXPECTED_MESSAGE;
2394                 goto f_err;
2395                 }
2396
2397         /* we now have a signature that we need to verify */
2398         p=(unsigned char *)s->init_msg;
2399         n2s(p,i);
2400         n-=2;
2401         if (i > n)
2402                 {
2403                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2404                 al=SSL_AD_DECODE_ERROR;
2405                 goto f_err;
2406                 }
2407
2408         j=EVP_PKEY_size(pkey);
2409         if ((i > j) || (n > j) || (n <= 0))
2410                 {
2411                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2412                 al=SSL_AD_DECODE_ERROR;
2413                 goto f_err;
2414                 }
2415
2416 #ifndef OPENSSL_NO_RSA
2417         if (pkey->type == EVP_PKEY_RSA)
2418                 {
2419                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2420                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
2421                                                         pkey->pkey.rsa);
2422                 if (i < 0)
2423                         {
2424                         al=SSL_AD_DECRYPT_ERROR;
2425                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2426                         goto f_err;
2427                         }
2428                 if (i == 0)
2429                         {
2430                         al=SSL_AD_DECRYPT_ERROR;
2431                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2432                         goto f_err;
2433                         }
2434                 }
2435         else
2436 #endif
2437 #ifndef OPENSSL_NO_DSA
2438                 if (pkey->type == EVP_PKEY_DSA)
2439                 {
2440                 j=DSA_verify(pkey->save_type,
2441                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2442                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2443                 if (j <= 0)
2444                         {
2445                         /* bad signature */
2446                         al=SSL_AD_DECRYPT_ERROR;
2447                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2448                         goto f_err;
2449                         }
2450                 }
2451         else
2452 #endif
2453 #ifndef OPENSSL_NO_ECDSA
2454                 if (pkey->type == EVP_PKEY_EC)
2455                 {
2456                 j=ECDSA_verify(pkey->save_type,
2457                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2458                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2459                 if (j <= 0)
2460                         {
2461                         /* bad signature */
2462                         al=SSL_AD_DECRYPT_ERROR;
2463                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2464                             SSL_R_BAD_ECDSA_SIGNATURE);
2465                         goto f_err;
2466                         }
2467                 }
2468         else
2469 #endif
2470                 {
2471                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2472                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2473                 goto f_err;
2474                 }
2475
2476
2477         ret=1;
2478         if (0)
2479                 {
2480 f_err:
2481                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2482                 }
2483 end:
2484         EVP_PKEY_free(pkey);
2485         return(ret);
2486         }
2487
2488 int ssl3_get_client_certificate(SSL *s)
2489         {
2490         int i,ok,al,ret= -1;
2491         X509 *x=NULL;
2492         unsigned long l,nc,llen,n;
2493         const unsigned char *p,*q;
2494         unsigned char *d;
2495         STACK_OF(X509) *sk=NULL;
2496
2497         n=s->method->ssl_get_message(s,
2498                 SSL3_ST_SR_CERT_A,
2499                 SSL3_ST_SR_CERT_B,
2500                 -1,
2501                 s->max_cert_list,
2502                 &ok);
2503
2504         if (!ok) return((int)n);
2505
2506         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2507                 {
2508                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2509                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2510                         {
2511                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2512                         al=SSL_AD_HANDSHAKE_FAILURE;
2513                         goto f_err;
2514                         }
2515                 /* If tls asked for a client cert, the client must return a 0 list */
2516                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2517                         {
2518                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2519                         al=SSL_AD_UNEXPECTED_MESSAGE;
2520                         goto f_err;
2521                         }
2522                 s->s3->tmp.reuse_message=1;
2523                 return(1);
2524                 }
2525
2526         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2527                 {
2528                 al=SSL_AD_UNEXPECTED_MESSAGE;
2529                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2530                 goto f_err;
2531                 }
2532         p=d=(unsigned char *)s->init_msg;
2533
2534         if ((sk=sk_X509_new_null()) == NULL)
2535                 {
2536                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2537                 goto err;
2538                 }
2539
2540         n2l3(p,llen);
2541         if (llen+3 != n)
2542                 {
2543                 al=SSL_AD_DECODE_ERROR;
2544                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2545                 goto f_err;
2546                 }
2547         for (nc=0; nc<llen; )
2548                 {
2549                 n2l3(p,l);
2550                 if ((l+nc+3) > llen)
2551                         {
2552                         al=SSL_AD_DECODE_ERROR;
2553                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2554                         goto f_err;
2555                         }
2556
2557                 q=p;
2558                 x=d2i_X509(NULL,&p,l);
2559                 if (x == NULL)
2560                         {
2561                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2562                         goto err;
2563                         }
2564                 if (p != (q+l))
2565                         {
2566                         al=SSL_AD_DECODE_ERROR;
2567                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2568                         goto f_err;
2569                         }
2570                 if (!sk_X509_push(sk,x))
2571                         {
2572                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2573                         goto err;
2574                         }
2575                 x=NULL;
2576                 nc+=l+3;
2577                 }
2578
2579         if (sk_X509_num(sk) <= 0)
2580                 {
2581                 /* TLS does not mind 0 certs returned */
2582                 if (s->version == SSL3_VERSION)
2583                         {
2584                         al=SSL_AD_HANDSHAKE_FAILURE;
2585                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2586                         goto f_err;
2587                         }
2588                 /* Fail for TLS only if we required a certificate */
2589                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2590                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2591                         {
2592                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2593                         al=SSL_AD_HANDSHAKE_FAILURE;
2594                         goto f_err;
2595                         }
2596                 }
2597         else
2598                 {
2599                 i=ssl_verify_cert_chain(s,sk);
2600                 if (i <= 0)
2601                         {
2602                         al=ssl_verify_alarm_type(s->verify_result);
2603                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2604                         goto f_err;
2605                         }
2606                 }
2607
2608         if (s->session->peer != NULL) /* This should not be needed */
2609                 X509_free(s->session->peer);
2610         s->session->peer=sk_X509_shift(sk);
2611         s->session->verify_result = s->verify_result;
2612
2613         /* With the current implementation, sess_cert will always be NULL
2614          * when we arrive here. */
2615         if (s->session->sess_cert == NULL)
2616                 {
2617                 s->session->sess_cert = ssl_sess_cert_new();
2618                 if (s->session->sess_cert == NULL)
2619                         {
2620                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2621                         goto err;
2622                         }
2623                 }
2624         if (s->session->sess_cert->cert_chain != NULL)
2625                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2626         s->session->sess_cert->cert_chain=sk;
2627         /* Inconsistency alert: cert_chain does *not* include the
2628          * peer's own certificate, while we do include it in s3_clnt.c */
2629
2630         sk=NULL;
2631
2632         ret=1;
2633         if (0)
2634                 {
2635 f_err:
2636                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2637                 }
2638 err:
2639         if (x != NULL) X509_free(x);
2640         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2641         return(ret);
2642         }
2643
2644 int ssl3_send_server_certificate(SSL *s)
2645         {
2646         unsigned long l;
2647         X509 *x;
2648
2649         if (s->state == SSL3_ST_SW_CERT_A)
2650                 {
2651                 x=ssl_get_server_send_cert(s);
2652                 if (x == NULL &&
2653                         /* VRS: allow null cert if auth == KRB5 */
2654                         (s->s3->tmp.new_cipher->algorithms
2655                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
2656                         != (SSL_aKRB5|SSL_kKRB5))
2657                         {
2658                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2659                         return(0);
2660                         }
2661
2662                 l=ssl3_output_cert_chain(s,x);
2663                 s->state=SSL3_ST_SW_CERT_B;
2664                 s->init_num=(int)l;
2665                 s->init_off=0;
2666                 }
2667
2668         /* SSL3_ST_SW_CERT_B */
2669         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2670         }
2671
2672
2673 #ifndef OPENSSL_NO_ECDH
2674 /* This is the complement of curve_id2nid in s3_clnt.c. */
2675 static int nid2curve_id(int nid)
2676 {
2677         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2678          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2679         switch (nid) {
2680         case NID_sect163k1: /* sect163k1 (1) */
2681                 return 1;
2682         case NID_sect163r1: /* sect163r1 (2) */
2683                 return 2;
2684         case NID_sect163r2: /* sect163r2 (3) */
2685                 return 3;
2686         case NID_sect193r1: /* sect193r1 (4) */
2687                 return 4;
2688         case NID_sect193r2: /* sect193r2 (5) */
2689                 return 5;
2690         case NID_sect233k1: /* sect233k1 (6) */
2691                 return 6;
2692         case NID_sect233r1: /* sect233r1 (7) */
2693                 return 7;
2694         case NID_sect239k1: /* sect239k1 (8) */
2695                 return 8;
2696         case NID_sect283k1: /* sect283k1 (9) */
2697                 return 9;
2698         case NID_sect283r1: /* sect283r1 (10) */
2699                 return 10;
2700         case NID_sect409k1: /* sect409k1 (11) */
2701                 return 11;
2702         case NID_sect409r1: /* sect409r1 (12) */
2703                 return 12;
2704         case NID_sect571k1: /* sect571k1 (13) */
2705                 return 13;
2706         case NID_sect571r1: /* sect571r1 (14) */
2707                 return 14;
2708         case NID_secp160k1: /* secp160k1 (15) */
2709                 return 15;
2710         case NID_secp160r1: /* secp160r1 (16) */
2711                 return 16;
2712         case NID_secp160r2: /* secp160r2 (17) */
2713                 return 17;
2714         case NID_secp192k1: /* secp192k1 (18) */
2715                 return 18;
2716         case NID_X9_62_prime192v1: /* secp192r1 (19) */
2717                 return 19;
2718         case NID_secp224k1: /* secp224k1 (20) */
2719                 return 20;
2720         case NID_secp224r1: /* secp224r1 (21) */
2721                 return 21;
2722         case NID_secp256k1: /* secp256k1 (22) */
2723                 return 22;
2724         case NID_X9_62_prime256v1: /* secp256r1 (23) */
2725                 return 23;
2726         case NID_secp384r1: /* secp384r1 (24) */
2727                 return 24;
2728         case NID_secp521r1:  /* secp521r1 (25) */
2729                 return 25;
2730         default:
2731                 return 0;
2732         }
2733 }
2734 #endif
2735 #ifndef OPENSSL_NO_TLSEXT
2736 int ssl3_send_newsession_ticket(SSL *s)
2737         {
2738         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
2739                 {
2740                 unsigned char *p, *senc, *macstart;
2741                 int len, slen;
2742                 unsigned int hlen;
2743                 EVP_CIPHER_CTX ctx;
2744                 HMAC_CTX hctx;
2745                 SSL_CTX *tctx = s->initial_ctx;
2746                 unsigned char iv[EVP_MAX_IV_LENGTH];
2747                 unsigned char key_name[16];
2748
2749                 /* get session encoding length */
2750                 slen = i2d_SSL_SESSION(s->session, NULL);
2751                 /* Some length values are 16 bits, so forget it if session is
2752                  * too long
2753                  */
2754                 if (slen > 0xFF00)
2755                         return -1;
2756                 /* Grow buffer if need be: the length calculation is as
2757                  * follows 1 (size of message name) + 3 (message length
2758                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
2759                  * 16 (key name) + max_iv_len (iv length) +
2760                  * session_length + max_enc_block_size (max encrypted session
2761                  * length) + max_md_size (HMAC).
2762                  */
2763                 if (!BUF_MEM_grow(s->init_buf,
2764                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
2765                         EVP_MAX_MD_SIZE + slen))
2766                         return -1;
2767                 senc = OPENSSL_malloc(slen);
2768                 if (!senc)
2769                         return -1;
2770                 p = senc;
2771                 i2d_SSL_SESSION(s->session, &p);
2772
2773                 p=(unsigned char *)s->init_buf->data;
2774                 /* do the header */
2775                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
2776                 /* Skip message length for now */
2777                 p += 3;
2778                 EVP_CIPHER_CTX_init(&ctx);
2779                 HMAC_CTX_init(&hctx);
2780                 /* Initialize HMAC and cipher contexts. If callback present
2781                  * it does all the work otherwise use generated values
2782                  * from parent ctx.
2783                  */
2784                 if (tctx->tlsext_ticket_key_cb)
2785                         {
2786                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
2787                                                          &hctx, 1) < 0)
2788                                 {
2789                                 OPENSSL_free(senc);
2790                                 return -1;
2791                                 }
2792                         }
2793                 else
2794                         {
2795                         RAND_pseudo_bytes(iv, 16);
2796                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
2797                                         tctx->tlsext_tick_aes_key, iv);
2798                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
2799                                         tlsext_tick_md(), NULL);
2800                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
2801                         }
2802                 l2n(s->session->tlsext_tick_lifetime_hint, p);
2803                 /* Skip ticket length for now */
2804                 p += 2;
2805                 /* Output key name */
2806                 macstart = p;
2807                 memcpy(p, key_name, 16);
2808                 p += 16;
2809                 /* output IV */
2810                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
2811                 p += EVP_CIPHER_CTX_iv_length(&ctx);
2812                 /* Encrypt session data */
2813                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
2814                 p += len;
2815                 EVP_EncryptFinal(&ctx, p, &len);
2816                 p += len;
2817                 EVP_CIPHER_CTX_cleanup(&ctx);
2818
2819                 HMAC_Update(&hctx, macstart, p - macstart);
2820                 HMAC_Final(&hctx, p, &hlen);
2821                 HMAC_CTX_cleanup(&hctx);
2822
2823                 p += hlen;
2824                 /* Now write out lengths: p points to end of data written */
2825                 /* Total length */
2826                 len = p - (unsigned char *)s->init_buf->data;
2827                 p=(unsigned char *)s->init_buf->data + 1;
2828                 l2n3(len - 4, p); /* Message length */
2829                 p += 4;
2830                 s2n(len - 10, p);  /* Ticket length */
2831
2832                 /* number of bytes to write */
2833                 s->init_num= len;
2834                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
2835                 s->init_off=0;
2836                 OPENSSL_free(senc);
2837                 }
2838
2839         /* SSL3_ST_SW_SESSION_TICKET_B */
2840         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2841         }
2842
2843 int ssl3_send_cert_status(SSL *s)
2844         {
2845         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
2846                 {
2847                 unsigned char *p;
2848                 /* Grow buffer if need be: the length calculation is as
2849                  * follows 1 (message type) + 3 (message length) +
2850                  * 1 (ocsp response type) + 3 (ocsp response length)
2851                  * + (ocsp response)
2852                  */
2853                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
2854                         return -1;
2855
2856                 p=(unsigned char *)s->init_buf->data;
2857
2858                 /* do the header */
2859                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
2860                 /* message length */
2861                 l2n3(s->tlsext_ocsp_resplen + 4, p);
2862                 /* status type */
2863                 *(p++)= s->tlsext_status_type;
2864                 /* length of OCSP response */
2865                 l2n3(s->tlsext_ocsp_resplen, p);
2866                 /* actual response */
2867                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
2868                 /* number of bytes to write */
2869                 s->init_num = 8 + s->tlsext_ocsp_resplen;
2870                 s->state=SSL3_ST_SW_CERT_STATUS_B;
2871                 s->init_off = 0;
2872                 }
2873
2874         /* SSL3_ST_SW_CERT_STATUS_B */
2875         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2876         }
2877 #endif