crypto/openssl/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                         s->s3->flags &= ~SSL3_FLAGS_SGC_RESTART_DONE;
 239
 240                         if (s->state != SSL_ST_RENEGOTIATE)
 241                                 {
 242                                 /* Ok, we now need to push on a buffering BIO so that
 243                                  * the output is sent in a way that TCP likes :-)
 244                                  */
 245                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 246
 247                                 ssl3_init_finished_mac(s);
 248                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 249                                 s->ctx->stats.sess_accept++;
 250                                 }
 251                         else if (!s->s3->send_connection_binding &&
 252                                 !(s->options & SSL_OP_ALLOW_UNSAFE_LEGACY_RENEGOTIATION))
 253                                 {
 254                                 /* Server attempting to renegotiate with
 255                                  * client that doesn't support secure
 256                                  * renegotiation.
 257                                  */
 258                                 SSLerr(SSL_F_SSL3_ACCEPT, SSL_R_UNSAFE_LEGACY_RENEGOTIATION_DISABLED);
 259                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
 260                                 ret = -1;
 261                                 goto end;
 262                                 }
 263                         else
 264                                 {
 265                                 /* s->state == SSL_ST_RENEGOTIATE,
 266                                  * we will just send a HelloRequest */
 267                                 s->ctx->stats.sess_accept_renegotiate++;
 268                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 269                                 }
 270                         break;
 271
 272                 case SSL3_ST_SW_HELLO_REQ_A:
 273                 case SSL3_ST_SW_HELLO_REQ_B:
 274
 275                         s->shutdown=0;
 276                         ret=ssl3_send_hello_request(s);
 277                         if (ret <= 0) goto end;
 278                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 279                         s->state=SSL3_ST_SW_FLUSH;
 280                         s->init_num=0;
 281
 282                         ssl3_init_finished_mac(s);
 283                         break;
 284
 285                 case SSL3_ST_SW_HELLO_REQ_C:
 286                         s->state=SSL_ST_OK;
 287                         break;
 288
 289                 case SSL3_ST_SR_CLNT_HELLO_A:
 290                 case SSL3_ST_SR_CLNT_HELLO_B:
 291                 case SSL3_ST_SR_CLNT_HELLO_C:
 292
 293                         s->shutdown=0;
 294                         ret=ssl3_get_client_hello(s);
 295                         if (ret <= 0) goto end;
 296                         s->new_session = 2;
 297                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 298                         s->init_num=0;
 299                         break;
 300
 301                 case SSL3_ST_SW_SRVR_HELLO_A:
 302                 case SSL3_ST_SW_SRVR_HELLO_B:
 303                         ret=ssl3_send_server_hello(s);
 304                         if (ret <= 0) goto end;
 305 #ifndef OPENSSL_NO_TLSEXT
 306                         if (s->hit)
 307                                 {
 308                                 if (s->tlsext_ticket_expected)
 309                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 310                                 else
 311                                         s->state=SSL3_ST_SW_CHANGE_A;
 312                                 }
 313 #else
 314                         if (s->hit)
 315                                         s->state=SSL3_ST_SW_CHANGE_A;
 316 #endif
 317                         else
 318                                 s->state=SSL3_ST_SW_CERT_A;
 319                         s->init_num=0;
 320                         break;
 321
 322                 case SSL3_ST_SW_CERT_A:
 323                 case SSL3_ST_SW_CERT_B:
 324                         /* Check if it is anon DH or anon ECDH or KRB5 */
 325                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)
 326                                 && !(s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 327                                 {
 328                                 ret=ssl3_send_server_certificate(s);
 329                                 if (ret <= 0) goto end;
 330 #ifndef OPENSSL_NO_TLSEXT
 331                                 if (s->tlsext_status_expected)
 332                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 333                                 else
 334                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 335                                 }
 336                         else
 337                                 {
 338                                 skip = 1;
 339                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 340                                 }
 341 #else
 342                                 }
 343                         else
 344                                 skip=1;
 345
 346                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 347 #endif
 348                         s->init_num=0;
 349                         break;
 350
 351                 case SSL3_ST_SW_KEY_EXCH_A:
 352                 case SSL3_ST_SW_KEY_EXCH_B:
 353                         l=s->s3->tmp.new_cipher->algorithms;
 354
 355                         /* clear this, it may get reset by
 356                          * send_server_key_exchange */
 357                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 358 #ifndef OPENSSL_NO_KRB5
 359                                 && !(l & SSL_KRB5)
 360 #endif /* OPENSSL_NO_KRB5 */
 361                                 )
 362                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 363                                  * even when forbidden by protocol specs
 364                                  * (handshake may fail as clients are not required to
 365                                  * be able to handle this) */
 366                                 s->s3->tmp.use_rsa_tmp=1;
 367                         else
 368                                 s->s3->tmp.use_rsa_tmp=0;
 369
 370
 371                         /* only send if a DH key exchange, fortezza or
 372                          * RSA but we have a sign only certificate
 373                          *
 374                          * For ECC ciphersuites, we send a serverKeyExchange
 375                          * message only if the cipher suite is either
 376                          * ECDH-anon or ECDHE. In other cases, the
 377                          * server certificate contains the server's
 378                          * public key for key exchange.
 379                          */
 380                         if (s->s3->tmp.use_rsa_tmp
 381                             || (l & SSL_kECDHE)
 382                             || (l & (SSL_DH|SSL_kFZA))
 383                             || ((l & SSL_kRSA)
 384                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 385                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 386                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 387                                         )
 388                                     )
 389                                 )
 390                             )
 391                                 {
 392                                 ret=ssl3_send_server_key_exchange(s);
 393                                 if (ret <= 0) goto end;
 394                                 }
 395                         else
 396                                 skip=1;
 397
 398                         s->state=SSL3_ST_SW_CERT_REQ_A;
 399                         s->init_num=0;
 400                         break;
 401
 402                 case SSL3_ST_SW_CERT_REQ_A:
 403                 case SSL3_ST_SW_CERT_REQ_B:
 404                         if (/* don't request cert unless asked for it: */
 405                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 406                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 407                                  * don't request cert during re-negotiation: */
 408                                 ((s->session->peer != NULL) &&
 409                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 410                                 /* never request cert in anonymous ciphersuites
 411                                  * (see section "Certificate request" in SSL 3 drafts
 412                                  * and in RFC 2246): */
 413                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 414                                  /* ... except when the application insists on verification
 415                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 416                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 417                                  /* never request cert in Kerberos ciphersuites */
 418                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 419                                 {
 420                                 /* no cert request */
 421                                 skip=1;
 422                                 s->s3->tmp.cert_request=0;
 423                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 424                                 }
 425                         else
 426                                 {
 427                                 s->s3->tmp.cert_request=1;
 428                                 ret=ssl3_send_certificate_request(s);
 429                                 if (ret <= 0) goto end;
 430 #ifndef NETSCAPE_HANG_BUG
 431                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 432 #else
 433                                 s->state=SSL3_ST_SW_FLUSH;
 434                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 435 #endif
 436                                 s->init_num=0;
 437                                 }
 438                         break;
 439
 440                 case SSL3_ST_SW_SRVR_DONE_A:
 441                 case SSL3_ST_SW_SRVR_DONE_B:
 442                         ret=ssl3_send_server_done(s);
 443                         if (ret <= 0) goto end;
 444                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 445                         s->state=SSL3_ST_SW_FLUSH;
 446                         s->init_num=0;
 447                         break;
 448
 449                 case SSL3_ST_SW_FLUSH:
 450
 451                         /* This code originally checked to see if
 452                          * any data was pending using BIO_CTRL_INFO
 453                          * and then flushed. This caused problems
 454                          * as documented in PR#1939. The proposed
 455                          * fix doesn't completely resolve this issue
 456                          * as buggy implementations of BIO_CTRL_PENDING
 457                          * still exist. So instead we just flush
 458                          * unconditionally.
 459                          */
 460
 461                         s->rwstate=SSL_WRITING;
 462                         if (BIO_flush(s->wbio) <= 0)
 463                                 {
 464                                 ret= -1;
 465                                 goto end;
 466                                 }
 467                         s->rwstate=SSL_NOTHING;
 468
 469                         s->state=s->s3->tmp.next_state;
 470                         break;
 471
 472                 case SSL3_ST_SR_CERT_A:
 473                 case SSL3_ST_SR_CERT_B:
 474                         /* Check for second client hello (MS SGC) */
 475                         ret = ssl3_check_client_hello(s);
 476                         if (ret <= 0)
 477                                 goto end;
 478                         if (ret == 2)
 479                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 480                         else {
 481                                 if (s->s3->tmp.cert_request)
 482                                         {
 483                                         ret=ssl3_get_client_certificate(s);
 484                                         if (ret <= 0) goto end;
 485                                         }
 486                                 s->init_num=0;
 487                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 488                         }
 489                         break;
 490
 491                 case SSL3_ST_SR_KEY_EXCH_A:
 492                 case SSL3_ST_SR_KEY_EXCH_B:
 493                         ret=ssl3_get_client_key_exchange(s);
 494                         if (ret <= 0)
 495                                 goto end;
 496                         if (ret == 2)
 497                                 {
 498                                 /* For the ECDH ciphersuites when
 499                                  * the client sends its ECDH pub key in
 500                                  * a certificate, the CertificateVerify
 501                                  * message is not sent.
 502                                  */
 503                                 s->state=SSL3_ST_SR_FINISHED_A;
 504                                 s->init_num = 0;
 505                                 }
 506                         else
 507                                 {
 508                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 509                                 s->init_num=0;
 510
 511                                 /* We need to get hashes here so if there is
 512                                  * a client cert, it can be verified
 513                                  */
 514                                 s->method->ssl3_enc->cert_verify_mac(s,
 515                                     &(s->s3->finish_dgst1),
 516                                     &(s->s3->tmp.cert_verify_md[0]));
 517                                 s->method->ssl3_enc->cert_verify_mac(s,
 518                                     &(s->s3->finish_dgst2),
 519                                     &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 520                                 }
 521                         break;
 522
 523                 case SSL3_ST_SR_CERT_VRFY_A:
 524                 case SSL3_ST_SR_CERT_VRFY_B:
 525
 526                         /* we should decide if we expected this one */
 527                         ret=ssl3_get_cert_verify(s);
 528                         if (ret <= 0) goto end;
 529
 530                         s->state=SSL3_ST_SR_FINISHED_A;
 531                         s->init_num=0;
 532                         break;
 533
 534                 case SSL3_ST_SR_FINISHED_A:
 535                 case SSL3_ST_SR_FINISHED_B:
 536                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 537                                 SSL3_ST_SR_FINISHED_B);
 538                         if (ret <= 0) goto end;
 539                         if (s->hit)
 540                                 s->state=SSL_ST_OK;
 541 #ifndef OPENSSL_NO_TLSEXT
 542                         else if (s->tlsext_ticket_expected)
 543                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 544 #endif
 545                         else
 546                                 s->state=SSL3_ST_SW_CHANGE_A;
 547                         s->init_num=0;
 548                         break;
 549
 550 #ifndef OPENSSL_NO_TLSEXT
 551                 case SSL3_ST_SW_SESSION_TICKET_A:
 552                 case SSL3_ST_SW_SESSION_TICKET_B:
 553                         ret=ssl3_send_newsession_ticket(s);
 554                         if (ret <= 0) goto end;
 555                         s->state=SSL3_ST_SW_CHANGE_A;
 556                         s->init_num=0;
 557                         break;
 558
 559                 case SSL3_ST_SW_CERT_STATUS_A:
 560                 case SSL3_ST_SW_CERT_STATUS_B:
 561                         ret=ssl3_send_cert_status(s);
 562                         if (ret <= 0) goto end;
 563                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 564                         s->init_num=0;
 565                         break;
 566
 567 #endif
 568
 569                 case SSL3_ST_SW_CHANGE_A:
 570                 case SSL3_ST_SW_CHANGE_B:
 571
 572                         s->session->cipher=s->s3->tmp.new_cipher;
 573                         if (!s->method->ssl3_enc->setup_key_block(s))
 574                                 { ret= -1; goto end; }
 575
 576                         ret=ssl3_send_change_cipher_spec(s,
 577                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 578
 579                         if (ret <= 0) goto end;
 580                         s->state=SSL3_ST_SW_FINISHED_A;
 581                         s->init_num=0;
 582
 583                         if (!s->method->ssl3_enc->change_cipher_state(s,
 584                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 585                                 {
 586                                 ret= -1;
 587                                 goto end;
 588                                 }
 589
 590                         break;
 591
 592                 case SSL3_ST_SW_FINISHED_A:
 593                 case SSL3_ST_SW_FINISHED_B:
 594                         ret=ssl3_send_finished(s,
 595                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 596                                 s->method->ssl3_enc->server_finished_label,
 597                                 s->method->ssl3_enc->server_finished_label_len);
 598                         if (ret <= 0) goto end;
 599                         s->state=SSL3_ST_SW_FLUSH;
 600                         if (s->hit)
 601                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 602                         else
 603                                 s->s3->tmp.next_state=SSL_ST_OK;
 604                         s->init_num=0;
 605                         break;
 606
 607                 case SSL_ST_OK:
 608                         /* clean a few things up */
 609                         ssl3_cleanup_key_block(s);
 610
 611                         BUF_MEM_free(s->init_buf);
 612                         s->init_buf=NULL;
 613
 614                         /* remove buffering on output */
 615                         ssl_free_wbio_buffer(s);
 616
 617                         s->init_num=0;
 618
 619                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 620                                 {
 621                                 /* actually not necessarily a 'new' session unless
 622                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 623
 624                                 s->new_session=0;
 625
 626                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 627
 628                                 s->ctx->stats.sess_accept_good++;
 629                                 /* s->server=1; */
 630                                 s->handshake_func=ssl3_accept;
 631
 632                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 633                                 }
 634
 635                         ret = 1;
 636                         goto end;
 637                         /* break; */
 638
 639                 default:
 640                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 641                         ret= -1;
 642                         goto end;
 643                         /* break; */
 644                         }
 645
 646                 if (!s->s3->tmp.reuse_message && !skip)
 647                         {
 648                         if (s->debug)
 649                                 {
 650                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 651                                         goto end;
 652                                 }
 653
 654
 655                         if ((cb != NULL) && (s->state != state))
 656                                 {
 657                                 new_state=s->state;
 658                                 s->state=state;
 659                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 660                                 s->state=new_state;
 661                                 }
 662                         }
 663                 skip=0;
 664                 }
 665 end:
 666         /* BIO_flush(s->wbio); */
 667
 668         s->in_handshake--;
 669         if (cb != NULL)
 670                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 671         return(ret);
 672         }
 673
 674 int ssl3_send_hello_request(SSL *s)
 675         {
 676         unsigned char *p;
 677
 678         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 679                 {
 680                 p=(unsigned char *)s->init_buf->data;
 681                 *(p++)=SSL3_MT_HELLO_REQUEST;
 682                 *(p++)=0;
 683                 *(p++)=0;
 684                 *(p++)=0;
 685
 686                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 687                 /* number of bytes to write */
 688                 s->init_num=4;
 689                 s->init_off=0;
 690                 }
 691
 692         /* SSL3_ST_SW_HELLO_REQ_B */
 693         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 694         }
 695
 696 int ssl3_check_client_hello(SSL *s)
 697         {
 698         int ok;
 699         long n;
 700
 701         /* this function is called when we really expect a Certificate message,
 702          * so permit appropriate message length */
 703         n=s->method->ssl_get_message(s,
 704                 SSL3_ST_SR_CERT_A,
 705                 SSL3_ST_SR_CERT_B,
 706                 -1,
 707                 s->max_cert_list,
 708                 &ok);
 709         if (!ok) return((int)n);
 710         s->s3->tmp.reuse_message = 1;
 711         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 712                 {
 713                 /* We only allow the client to restart the handshake once per
 714                  * negotiation. */
 715                 if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
 716                         {
 717                         SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
 718                         return -1;
 719                         }
 720                 /* Throw away what we have done so far in the current handshake,
 721                  * which will now be aborted. (A full SSL_clear would be too much.)
 722                  * I hope that tmp.dh is the only thing that may need to be cleared
 723                  * when a handshake is not completed ... */
 724 #ifndef OPENSSL_NO_DH
 725                 if (s->s3->tmp.dh != NULL)
 726                         {
 727                         DH_free(s->s3->tmp.dh);
 728                         s->s3->tmp.dh = NULL;
 729                         }
 730 #endif
 731                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
 732                 return 2;
 733                 }
 734         return 1;
 735 }
 736
 737 int ssl3_get_client_hello(SSL *s)
 738         {
 739         int i,j,ok,al,ret= -1;
 740         unsigned int cookie_len;
 741         long n;
 742         unsigned long id;
 743         unsigned char *p,*d,*q;
 744         SSL_CIPHER *c;
 745 #ifndef OPENSSL_NO_COMP
 746         SSL_COMP *comp=NULL;
 747 #endif
 748         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 749
 750         /* We do this so that we will respond with our native type.
 751          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 752          * This down switching should be handled by a different method.
 753          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 754          * TLSv1.
 755          */
 756         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 757                 {
 758                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 759                 }
 760         s->first_packet=1;
 761         n=s->method->ssl_get_message(s,
 762                 SSL3_ST_SR_CLNT_HELLO_B,
 763                 SSL3_ST_SR_CLNT_HELLO_C,
 764                 SSL3_MT_CLIENT_HELLO,
 765                 SSL3_RT_MAX_PLAIN_LENGTH,
 766                 &ok);
 767
 768         if (!ok) return((int)n);
 769         s->first_packet=0;
 770         d=p=(unsigned char *)s->init_msg;
 771
 772         /* use version from inside client hello, not from record header
 773          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 774         s->client_version=(((int)p[0])<<8)|(int)p[1];
 775         p+=2;
 776
 777         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 778             (s->version != DTLS1_VERSION && s->client_version < s->version))
 779                 {
 780                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 781                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 782                         {
 783                         /* similar to ssl3_get_record, send alert using remote version number */
 784                         s->version = s->client_version;
 785                         }
 786                 al = SSL_AD_PROTOCOL_VERSION;
 787                 goto f_err;
 788                 }
 789
 790         /* If we require cookies and this ClientHello doesn't
 791          * contain one, just return since we do not want to
 792          * allocate any memory yet. So check cookie length...
 793          */
 794         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
 795                 {
 796                 unsigned int session_length, cookie_length;
 797
 798                 session_length = *(p + SSL3_RANDOM_SIZE);
 799                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
 800
 801                 if (cookie_length == 0)
 802                         return 1;
 803                 }
 804
 805         /* load the client random */
 806         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 807         p+=SSL3_RANDOM_SIZE;
 808
 809         /* get the session-id */
 810         j= *(p++);
 811
 812         s->hit=0;
 813         /* Versions before 0.9.7 always allow session reuse during renegotiation
 814          * (i.e. when s->new_session is true), option
 815          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
 816          * Maybe this optional behaviour should always have been the default,
 817          * but we cannot safely change the default behaviour (or new applications
 818          * might be written that become totally unsecure when compiled with
 819          * an earlier library version)
 820          */
 821         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 822                 {
 823                 if (!ssl_get_new_session(s,1))
 824                         goto err;
 825                 }
 826         else
 827                 {
 828                 i=ssl_get_prev_session(s, p, j, d + n);
 829                 if (i == 1)
 830                         { /* previous session */
 831                         s->hit=1;
 832                         }
 833                 else if (i == -1)
 834                         goto err;
 835                 else /* i == 0 */
 836                         {
 837                         if (!ssl_get_new_session(s,1))
 838                                 goto err;
 839                         }
 840                 }
 841
 842         p+=j;
 843
 844         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
 845                 {
 846                 /* cookie stuff */
 847                 cookie_len = *(p++);
 848
 849                 /*
 850                  * The ClientHello may contain a cookie even if the
 851                  * HelloVerify message has not been sent--make sure that it
 852                  * does not cause an overflow.
 853                  */
 854                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
 855                         {
 856                         /* too much data */
 857                         al = SSL_AD_DECODE_ERROR;
 858                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 859                         goto f_err;
 860                         }
 861
 862                 /* verify the cookie if appropriate option is set. */
 863                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 864                         cookie_len > 0)
 865                         {
 866                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
 867
 868                         if ( s->ctx->app_verify_cookie_cb != NULL)
 869                                 {
 870                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
 871                                         cookie_len) == 0)
 872                                         {
 873                                         al=SSL_AD_HANDSHAKE_FAILURE;
 874                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 875                                                 SSL_R_COOKIE_MISMATCH);
 876                                         goto f_err;
 877                                         }
 878                                 /* else cookie verification succeeded */
 879                                 }
 880                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
 881                                                   s->d1->cookie_len) != 0) /* default verification */
 882                                 {
 883                                         al=SSL_AD_HANDSHAKE_FAILURE;
 884                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 885                                                 SSL_R_COOKIE_MISMATCH);
 886                                         goto f_err;
 887                                 }
 888
 889                         ret = 2;
 890                         }
 891
 892                 p += cookie_len;
 893                 }
 894
 895         n2s(p,i);
 896         if ((i == 0) && (j != 0))
 897                 {
 898                 /* we need a cipher if we are not resuming a session */
 899                 al=SSL_AD_ILLEGAL_PARAMETER;
 900                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 901                 goto f_err;
 902                 }
 903         if ((p+i) >= (d+n))
 904                 {
 905                 /* not enough data */
 906                 al=SSL_AD_DECODE_ERROR;
 907                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 908                 goto f_err;
 909                 }
 910         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 911                 == NULL))
 912                 {
 913                 goto err;
 914                 }
 915         p+=i;
 916
 917         /* If it is a hit, check that the cipher is in the list */
 918         if ((s->hit) && (i > 0))
 919                 {
 920                 j=0;
 921                 id=s->session->cipher->id;
 922
 923 #ifdef CIPHER_DEBUG
 924                 printf("client sent %d ciphers\n",sk_num(ciphers));
 925 #endif
 926                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 927                         {
 928                         c=sk_SSL_CIPHER_value(ciphers,i);
 929 #ifdef CIPHER_DEBUG
 930                         printf("client [%2d of %2d]:%s\n",
 931                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 932 #endif
 933                         if (c->id == id)
 934                                 {
 935                                 j=1;
 936                                 break;
 937                                 }
 938                         }
 939 /* Disabled because it can be used in a ciphersuite downgrade
 940  * attack: CVE-2010-4180.
 941  */
 942 #if 0
 943                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 944                         {
 945                         /* Special case as client bug workaround: the previously used cipher may
 946                          * not be in the current list, the client instead might be trying to
 947                          * continue using a cipher that before wasn't chosen due to server
 948                          * preferences.  We'll have to reject the connection if the cipher is not
 949                          * enabled, though. */
 950                         c = sk_SSL_CIPHER_value(ciphers, 0);
 951                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
 952                                 {
 953                                 s->session->cipher = c;
 954                                 j = 1;
 955                                 }
 956                         }
 957 #endif
 958                 if (j == 0)
 959                         {
 960                         /* we need to have the cipher in the cipher
 961                          * list if we are asked to reuse it */
 962                         al=SSL_AD_ILLEGAL_PARAMETER;
 963                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 964                         goto f_err;
 965                         }
 966                 }
 967
 968         /* compression */
 969         i= *(p++);
 970         if ((p+i) > (d+n))
 971                 {
 972                 /* not enough data */
 973                 al=SSL_AD_DECODE_ERROR;
 974                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 975                 goto f_err;
 976                 }
 977         q=p;
 978         for (j=0; j<i; j++)
 979                 {
 980                 if (p[j] == 0) break;
 981                 }
 982
 983         p+=i;
 984         if (j >= i)
 985                 {
 986                 /* no compress */
 987                 al=SSL_AD_DECODE_ERROR;
 988                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 989                 goto f_err;
 990                 }
 991
 992 #ifndef OPENSSL_NO_TLSEXT
 993         /* TLS extensions*/
 994         if (s->version >= SSL3_VERSION)
 995                 {
 996                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
 997                         {
 998                         /* 'al' set by ssl_parse_clienthello_tlsext */
 999                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1000                         goto f_err;
1001                         }
1002                 }
1003                 if (ssl_check_clienthello_tlsext(s) <= 0) {
1004                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1005                         goto err;
1006                 }
1007 #endif
1008         /* Worst case, we will use the NULL compression, but if we have other
1009          * options, we will now look for them.  We have i-1 compression
1010          * algorithms from the client, starting at q. */
1011         s->s3->tmp.new_compression=NULL;
1012 #ifndef OPENSSL_NO_COMP
1013         if (s->ctx->comp_methods != NULL)
1014                 { /* See if we have a match */
1015                 int m,nn,o,v,done=0;
1016
1017                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1018                 for (m=0; m<nn; m++)
1019                         {
1020                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1021                         v=comp->id;
1022                         for (o=0; o<i; o++)
1023                                 {
1024                                 if (v == q[o])
1025                                         {
1026                                         done=1;
1027                                         break;
1028                                         }
1029                                 }
1030                         if (done) break;
1031                         }
1032                 if (done)
1033                         s->s3->tmp.new_compression=comp;
1034                 else
1035                         comp=NULL;
1036                 }
1037 #endif
1038
1039         /* TLS does not mind if there is extra stuff */
1040 #if 0   /* SSL 3.0 does not mind either, so we should disable this test
1041          * (was enabled in 0.9.6d through 0.9.6j and 0.9.7 through 0.9.7b,
1042          * in earlier SSLeay/OpenSSL releases this test existed but was buggy) */
1043         if (s->version == SSL3_VERSION)
1044                 {
1045                 if (p < (d+n))
1046                         {
1047                         /* wrong number of bytes,
1048                          * there could be more to follow */
1049                         al=SSL_AD_DECODE_ERROR;
1050                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1051                         goto f_err;
1052                         }
1053                 }
1054 #endif
1055
1056         /* Given s->session->ciphers and SSL_get_ciphers, we must
1057          * pick a cipher */
1058
1059         if (!s->hit)
1060                 {
1061 #ifdef OPENSSL_NO_COMP
1062                 s->session->compress_meth=0;
1063 #else
1064                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1065 #endif
1066                 if (s->session->ciphers != NULL)
1067                         sk_SSL_CIPHER_free(s->session->ciphers);
1068                 s->session->ciphers=ciphers;
1069                 if (ciphers == NULL)
1070                         {
1071                         al=SSL_AD_ILLEGAL_PARAMETER;
1072                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1073                         goto f_err;
1074                         }
1075                 ciphers=NULL;
1076                 c=ssl3_choose_cipher(s,s->session->ciphers,
1077                                      SSL_get_ciphers(s));
1078
1079                 if (c == NULL)
1080                         {
1081                         al=SSL_AD_HANDSHAKE_FAILURE;
1082                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1083                         goto f_err;
1084                         }
1085                 s->s3->tmp.new_cipher=c;
1086                 }
1087         else
1088                 {
1089                 /* Session-id reuse */
1090 #ifdef REUSE_CIPHER_BUG
1091                 STACK_OF(SSL_CIPHER) *sk;
1092                 SSL_CIPHER *nc=NULL;
1093                 SSL_CIPHER *ec=NULL;
1094
1095                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1096                         {
1097                         sk=s->session->ciphers;
1098                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1099                                 {
1100                                 c=sk_SSL_CIPHER_value(sk,i);
1101                                 if (c->algorithms & SSL_eNULL)
1102                                         nc=c;
1103                                 if (SSL_C_IS_EXPORT(c))
1104                                         ec=c;
1105                                 }
1106                         if (nc != NULL)
1107                                 s->s3->tmp.new_cipher=nc;
1108                         else if (ec != NULL)
1109                                 s->s3->tmp.new_cipher=ec;
1110                         else
1111                                 s->s3->tmp.new_cipher=s->session->cipher;
1112                         }
1113                 else
1114 #endif
1115                 s->s3->tmp.new_cipher=s->session->cipher;
1116                 }
1117
1118         /* we now have the following setup.
1119          * client_random
1120          * cipher_list          - our prefered list of ciphers
1121          * ciphers              - the clients prefered list of ciphers
1122          * compression          - basically ignored right now
1123          * ssl version is set   - sslv3
1124          * s->session           - The ssl session has been setup.
1125          * s->hit               - session reuse flag
1126          * s->tmp.new_cipher    - the new cipher to use.
1127          */
1128
1129         if (ret < 0) ret=1;
1130         if (0)
1131                 {
1132 f_err:
1133                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1134                 }
1135 err:
1136         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1137         return(ret);
1138         }
1139
1140 int ssl3_send_server_hello(SSL *s)
1141         {
1142         unsigned char *buf;
1143         unsigned char *p,*d;
1144         int i,sl;
1145         unsigned long l,Time;
1146
1147         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1148                 {
1149                 buf=(unsigned char *)s->init_buf->data;
1150                 p=s->s3->server_random;
1151                 Time=(unsigned long)time(NULL);                 /* Time */
1152                 l2n(Time,p);
1153                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1154                         return -1;
1155                 /* Do the message type and length last */
1156                 d=p= &(buf[4]);
1157
1158                 *(p++)=s->version>>8;
1159                 *(p++)=s->version&0xff;
1160
1161                 /* Random stuff */
1162                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1163                 p+=SSL3_RANDOM_SIZE;
1164
1165                 /* now in theory we have 3 options to sending back the
1166                  * session id.  If it is a re-use, we send back the
1167                  * old session-id, if it is a new session, we send
1168                  * back the new session-id or we send back a 0 length
1169                  * session-id if we want it to be single use.
1170                  * Currently I will not implement the '0' length session-id
1171                  * 12-Jan-98 - I'll now support the '0' length stuff.
1172                  *
1173                  * We also have an additional case where stateless session
1174                  * resumption is successful: we always send back the old
1175                  * session id. In this case s->hit is non zero: this can
1176                  * only happen if stateless session resumption is succesful
1177                  * if session caching is disabled so existing functionality
1178                  * is unaffected.
1179                  */
1180                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1181                         && !s->hit)
1182                         s->session->session_id_length=0;
1183
1184                 sl=s->session->session_id_length;
1185                 if (sl > (int)sizeof(s->session->session_id))
1186                         {
1187                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1188                         return -1;
1189                         }
1190                 *(p++)=sl;
1191                 memcpy(p,s->session->session_id,sl);
1192                 p+=sl;
1193
1194                 /* put the cipher */
1195                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1196                 p+=i;
1197
1198                 /* put the compression method */
1199 #ifdef OPENSSL_NO_COMP
1200                         *(p++)=0;
1201 #else
1202                 if (s->s3->tmp.new_compression == NULL)
1203                         *(p++)=0;
1204                 else
1205                         *(p++)=s->s3->tmp.new_compression->id;
1206 #endif
1207 #ifndef OPENSSL_NO_TLSEXT
1208                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1209                         {
1210                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1211                         return -1;
1212                         }
1213 #endif
1214                 /* do the header */
1215                 l=(p-d);
1216                 d=buf;
1217                 *(d++)=SSL3_MT_SERVER_HELLO;
1218                 l2n3(l,d);
1219
1220                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1221                 /* number of bytes to write */
1222                 s->init_num=p-buf;
1223                 s->init_off=0;
1224                 }
1225
1226         /* SSL3_ST_SW_SRVR_HELLO_B */
1227         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1228         }
1229
1230 int ssl3_send_server_done(SSL *s)
1231         {
1232         unsigned char *p;
1233
1234         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1235                 {
1236                 p=(unsigned char *)s->init_buf->data;
1237
1238                 /* do the header */
1239                 *(p++)=SSL3_MT_SERVER_DONE;
1240                 *(p++)=0;
1241                 *(p++)=0;
1242                 *(p++)=0;
1243
1244                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1245                 /* number of bytes to write */
1246                 s->init_num=4;
1247                 s->init_off=0;
1248                 }
1249
1250         /* SSL3_ST_SW_SRVR_DONE_B */
1251         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1252         }
1253
1254 int ssl3_send_server_key_exchange(SSL *s)
1255         {
1256 #ifndef OPENSSL_NO_RSA
1257         unsigned char *q;
1258         int j,num;
1259         RSA *rsa;
1260         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1261         unsigned int u;
1262 #endif
1263 #ifndef OPENSSL_NO_DH
1264         DH *dh=NULL,*dhp;
1265 #endif
1266 #ifndef OPENSSL_NO_ECDH
1267         EC_KEY *ecdh=NULL, *ecdhp;
1268         unsigned char *encodedPoint = NULL;
1269         int encodedlen = 0;
1270         int curve_id = 0;
1271         BN_CTX *bn_ctx = NULL;
1272 #endif
1273         EVP_PKEY *pkey;
1274         unsigned char *p,*d;
1275         int al,i;
1276         unsigned long type;
1277         int n;
1278         CERT *cert;
1279         BIGNUM *r[4];
1280         int nr[4],kn;
1281         BUF_MEM *buf;
1282         EVP_MD_CTX md_ctx;
1283
1284         EVP_MD_CTX_init(&md_ctx);
1285         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1286                 {
1287                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1288                 cert=s->cert;
1289
1290                 buf=s->init_buf;
1291
1292                 r[0]=r[1]=r[2]=r[3]=NULL;
1293                 n=0;
1294 #ifndef OPENSSL_NO_RSA
1295                 if (type & SSL_kRSA)
1296                         {
1297                         rsa=cert->rsa_tmp;
1298                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1299                                 {
1300                                 rsa=s->cert->rsa_tmp_cb(s,
1301                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1302                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1303                                 if(rsa == NULL)
1304                                 {
1305                                         al=SSL_AD_HANDSHAKE_FAILURE;
1306                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1307                                         goto f_err;
1308                                 }
1309                                 RSA_up_ref(rsa);
1310                                 cert->rsa_tmp=rsa;
1311                                 }
1312                         if (rsa == NULL)
1313                                 {
1314                                 al=SSL_AD_HANDSHAKE_FAILURE;
1315                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1316                                 goto f_err;
1317                                 }
1318                         r[0]=rsa->n;
1319                         r[1]=rsa->e;
1320                         s->s3->tmp.use_rsa_tmp=1;
1321                         }
1322                 else
1323 #endif
1324 #ifndef OPENSSL_NO_DH
1325                         if (type & SSL_kEDH)
1326                         {
1327                         dhp=cert->dh_tmp;
1328                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1329                                 dhp=s->cert->dh_tmp_cb(s,
1330                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1331                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1332                         if (dhp == NULL)
1333                                 {
1334                                 al=SSL_AD_HANDSHAKE_FAILURE;
1335                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1336                                 goto f_err;
1337                                 }
1338
1339                         if (s->s3->tmp.dh != NULL)
1340                                 {
1341                                 DH_free(dh);
1342                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1343                                 goto err;
1344                                 }
1345
1346                         if ((dh=DHparams_dup(dhp)) == NULL)
1347                                 {
1348                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1349                                 goto err;
1350                                 }
1351
1352                         s->s3->tmp.dh=dh;
1353                         if ((dhp->pub_key == NULL ||
1354                              dhp->priv_key == NULL ||
1355                              (s->options & SSL_OP_SINGLE_DH_USE)))
1356                                 {
1357                                 if(!DH_generate_key(dh))
1358                                     {
1359                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1360                                            ERR_R_DH_LIB);
1361                                     goto err;
1362                                     }
1363                                 }
1364                         else
1365                                 {
1366                                 dh->pub_key=BN_dup(dhp->pub_key);
1367                                 dh->priv_key=BN_dup(dhp->priv_key);
1368                                 if ((dh->pub_key == NULL) ||
1369                                         (dh->priv_key == NULL))
1370                                         {
1371                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1372                                         goto err;
1373                                         }
1374                                 }
1375                         r[0]=dh->p;
1376                         r[1]=dh->g;
1377                         r[2]=dh->pub_key;
1378                         }
1379                 else
1380 #endif
1381 #ifndef OPENSSL_NO_ECDH
1382                         if (type & SSL_kECDHE)
1383                         {
1384                         const EC_GROUP *group;
1385
1386                         ecdhp=cert->ecdh_tmp;
1387                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1388                                 {
1389                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1390                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1391                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1392                                 }
1393                         if (ecdhp == NULL)
1394                                 {
1395                                 al=SSL_AD_HANDSHAKE_FAILURE;
1396                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1397                                 goto f_err;
1398                                 }
1399
1400                         if (s->s3->tmp.ecdh != NULL)
1401                                 {
1402                                 EC_KEY_free(s->s3->tmp.ecdh);
1403                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1404                                 goto err;
1405                                 }
1406
1407                         /* Duplicate the ECDH structure. */
1408                         if (ecdhp == NULL)
1409                                 {
1410                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1411                                 goto err;
1412                                 }
1413                         if (!EC_KEY_up_ref(ecdhp))
1414                                 {
1415                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1416                                 goto err;
1417                                 }
1418                         ecdh = ecdhp;
1419
1420                         s->s3->tmp.ecdh=ecdh;
1421                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1422                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1423                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1424                                 {
1425                                 if(!EC_KEY_generate_key(ecdh))
1426                                     {
1427                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1428                                     goto err;
1429                                     }
1430                                 }
1431
1432                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1433                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1434                             (EC_KEY_get0_private_key(ecdh) == NULL))
1435                                 {
1436                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1437                                 goto err;
1438                                 }
1439
1440                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1441                             (EC_GROUP_get_degree(group) > 163))
1442                                 {
1443                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1444                                 goto err;
1445                                 }
1446
1447                         /* XXX: For now, we only support ephemeral ECDH
1448                          * keys over named (not generic) curves. For
1449                          * supported named curves, curve_id is non-zero.
1450                          */
1451                         if ((curve_id =
1452                             nid2curve_id(EC_GROUP_get_curve_name(group)))
1453                             == 0)
1454                                 {
1455                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1456                                 goto err;
1457                                 }
1458
1459                         /* Encode the public key.
1460                          * First check the size of encoding and
1461                          * allocate memory accordingly.
1462                          */
1463                         encodedlen = EC_POINT_point2oct(group,
1464                             EC_KEY_get0_public_key(ecdh),
1465                             POINT_CONVERSION_UNCOMPRESSED,
1466                             NULL, 0, NULL);
1467
1468                         encodedPoint = (unsigned char *)
1469                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1470                         bn_ctx = BN_CTX_new();
1471                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1472                                 {
1473                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1474                                 goto err;
1475                                 }
1476
1477
1478                         encodedlen = EC_POINT_point2oct(group,
1479                             EC_KEY_get0_public_key(ecdh),
1480                             POINT_CONVERSION_UNCOMPRESSED,
1481                             encodedPoint, encodedlen, bn_ctx);
1482
1483                         if (encodedlen == 0)
1484                                 {
1485                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1486                                 goto err;
1487                                 }
1488
1489                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1490
1491                         /* XXX: For now, we only support named (not
1492                          * generic) curves in ECDH ephemeral key exchanges.
1493                          * In this situation, we need four additional bytes
1494                          * to encode the entire ServerECDHParams
1495                          * structure.
1496                          */
1497                         n = 4 + encodedlen;
1498
1499                         /* We'll generate the serverKeyExchange message
1500                          * explicitly so we can set these to NULLs
1501                          */
1502                         r[0]=NULL;
1503                         r[1]=NULL;
1504                         r[2]=NULL;
1505                         r[3]=NULL;
1506                         }
1507                 else
1508 #endif /* !OPENSSL_NO_ECDH */
1509                         {
1510                         al=SSL_AD_HANDSHAKE_FAILURE;
1511                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1512                         goto f_err;
1513                         }
1514                 for (i=0; r[i] != NULL; i++)
1515                         {
1516                         nr[i]=BN_num_bytes(r[i]);
1517                         n+=2+nr[i];
1518                         }
1519
1520                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1521                         {
1522                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1523                                 == NULL)
1524                                 {
1525                                 al=SSL_AD_DECODE_ERROR;
1526                                 goto f_err;
1527                                 }
1528                         kn=EVP_PKEY_size(pkey);
1529                         }
1530                 else
1531                         {
1532                         pkey=NULL;
1533                         kn=0;
1534                         }
1535
1536                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1537                         {
1538                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1539                         goto err;
1540                         }
1541                 d=(unsigned char *)s->init_buf->data;
1542                 p= &(d[4]);
1543
1544                 for (i=0; r[i] != NULL; i++)
1545                         {
1546                         s2n(nr[i],p);
1547                         BN_bn2bin(r[i],p);
1548                         p+=nr[i];
1549                         }
1550
1551 #ifndef OPENSSL_NO_ECDH
1552                 if (type & SSL_kECDHE)
1553                         {
1554                         /* XXX: For now, we only support named (not generic) curves.
1555                          * In this situation, the serverKeyExchange message has:
1556                          * [1 byte CurveType], [2 byte CurveName]
1557                          * [1 byte length of encoded point], followed by
1558                          * the actual encoded point itself
1559                          */
1560                         *p = NAMED_CURVE_TYPE;
1561                         p += 1;
1562                         *p = 0;
1563                         p += 1;
1564                         *p = curve_id;
1565                         p += 1;
1566                         *p = encodedlen;
1567                         p += 1;
1568                         memcpy((unsigned char*)p,
1569                             (unsigned char *)encodedPoint,
1570                             encodedlen);
1571                         OPENSSL_free(encodedPoint);
1572                         p += encodedlen;
1573                         }
1574 #endif
1575
1576                 /* not anonymous */
1577                 if (pkey != NULL)
1578                         {
1579                         /* n is the length of the params, they start at &(d[4])
1580                          * and p points to the space at the end. */
1581 #ifndef OPENSSL_NO_RSA
1582                         if (pkey->type == EVP_PKEY_RSA)
1583                                 {
1584                                 q=md_buf;
1585                                 j=0;
1586                                 for (num=2; num > 0; num--)
1587                                         {
1588                                         EVP_MD_CTX_set_flags(&md_ctx,
1589                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1590                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1591                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1592                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1593                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1594                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1595                                         EVP_DigestFinal_ex(&md_ctx,q,
1596                                                 (unsigned int *)&i);
1597                                         q+=i;
1598                                         j+=i;
1599                                         }
1600                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1601                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1602                                         {
1603                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1604                                         goto err;
1605                                         }
1606                                 s2n(u,p);
1607                                 n+=u+2;
1608                                 }
1609                         else
1610 #endif
1611 #if !defined(OPENSSL_NO_DSA)
1612                                 if (pkey->type == EVP_PKEY_DSA)
1613                                 {
1614                                 /* lets do DSS */
1615                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1616                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1617                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1618                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1619                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1620                                         (unsigned int *)&i,pkey))
1621                                         {
1622                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1623                                         goto err;
1624                                         }
1625                                 s2n(i,p);
1626                                 n+=i+2;
1627                                 }
1628                         else
1629 #endif
1630 #if !defined(OPENSSL_NO_ECDSA)
1631                                 if (pkey->type == EVP_PKEY_EC)
1632                                 {
1633                                 /* let's do ECDSA */
1634                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1635                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1636                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1637                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1638                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1639                                         (unsigned int *)&i,pkey))
1640                                         {
1641                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1642                                         goto err;
1643                                         }
1644                                 s2n(i,p);
1645                                 n+=i+2;
1646                                 }
1647                         else
1648 #endif
1649                                 {
1650                                 /* Is this error check actually needed? */
1651                                 al=SSL_AD_HANDSHAKE_FAILURE;
1652                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1653                                 goto f_err;
1654                                 }
1655                         }
1656
1657                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1658                 l2n3(n,d);
1659
1660                 /* we should now have things packed up, so lets send
1661                  * it off */
1662                 s->init_num=n+4;
1663                 s->init_off=0;
1664                 }
1665
1666         s->state = SSL3_ST_SW_KEY_EXCH_B;
1667         EVP_MD_CTX_cleanup(&md_ctx);
1668         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1669 f_err:
1670         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1671 err:
1672 #ifndef OPENSSL_NO_ECDH
1673         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1674         BN_CTX_free(bn_ctx);
1675 #endif
1676         EVP_MD_CTX_cleanup(&md_ctx);
1677         return(-1);
1678         }
1679
1680 int ssl3_send_certificate_request(SSL *s)
1681         {
1682         unsigned char *p,*d;
1683         int i,j,nl,off,n;
1684         STACK_OF(X509_NAME) *sk=NULL;
1685         X509_NAME *name;
1686         BUF_MEM *buf;
1687
1688         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1689                 {
1690                 buf=s->init_buf;
1691
1692                 d=p=(unsigned char *)&(buf->data[4]);
1693
1694                 /* get the list of acceptable cert types */
1695                 p++;
1696                 n=ssl3_get_req_cert_type(s,p);
1697                 d[0]=n;
1698                 p+=n;
1699                 n++;
1700
1701                 off=n;
1702                 p+=2;
1703                 n+=2;
1704
1705                 sk=SSL_get_client_CA_list(s);
1706                 nl=0;
1707                 if (sk != NULL)
1708                         {
1709                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1710                                 {
1711                                 name=sk_X509_NAME_value(sk,i);
1712                                 j=i2d_X509_NAME(name,NULL);
1713                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1714                                         {
1715                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1716                                         goto err;
1717                                         }
1718                                 p=(unsigned char *)&(buf->data[4+n]);
1719                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1720                                         {
1721                                         s2n(j,p);
1722                                         i2d_X509_NAME(name,&p);
1723                                         n+=2+j;
1724                                         nl+=2+j;
1725                                         }
1726                                 else
1727                                         {
1728                                         d=p;
1729                                         i2d_X509_NAME(name,&p);
1730                                         j-=2; s2n(j,d); j+=2;
1731                                         n+=j;
1732                                         nl+=j;
1733                                         }
1734                                 }
1735                         }
1736                 /* else no CA names */
1737                 p=(unsigned char *)&(buf->data[4+off]);
1738                 s2n(nl,p);
1739
1740                 d=(unsigned char *)buf->data;
1741                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1742                 l2n3(n,d);
1743
1744                 /* we should now have things packed up, so lets send
1745                  * it off */
1746
1747                 s->init_num=n+4;
1748                 s->init_off=0;
1749 #ifdef NETSCAPE_HANG_BUG
1750                 p=(unsigned char *)s->init_buf->data + s->init_num;
1751
1752                 /* do the header */
1753                 *(p++)=SSL3_MT_SERVER_DONE;
1754                 *(p++)=0;
1755                 *(p++)=0;
1756                 *(p++)=0;
1757                 s->init_num += 4;
1758 #endif
1759
1760                 s->state = SSL3_ST_SW_CERT_REQ_B;
1761                 }
1762
1763         /* SSL3_ST_SW_CERT_REQ_B */
1764         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1765 err:
1766         return(-1);
1767         }
1768
1769 int ssl3_get_client_key_exchange(SSL *s)
1770         {
1771         int i,al,ok;
1772         long n;
1773         unsigned long l;
1774         unsigned char *p;
1775 #ifndef OPENSSL_NO_RSA
1776         RSA *rsa=NULL;
1777         EVP_PKEY *pkey=NULL;
1778 #endif
1779 #ifndef OPENSSL_NO_DH
1780         BIGNUM *pub=NULL;
1781         DH *dh_srvr;
1782 #endif
1783 #ifndef OPENSSL_NO_KRB5
1784         KSSL_ERR kssl_err;
1785 #endif /* OPENSSL_NO_KRB5 */
1786
1787 #ifndef OPENSSL_NO_ECDH
1788         EC_KEY *srvr_ecdh = NULL;
1789         EVP_PKEY *clnt_pub_pkey = NULL;
1790         EC_POINT *clnt_ecpoint = NULL;
1791         BN_CTX *bn_ctx = NULL;
1792 #endif
1793
1794         n=s->method->ssl_get_message(s,
1795                 SSL3_ST_SR_KEY_EXCH_A,
1796                 SSL3_ST_SR_KEY_EXCH_B,
1797                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1798                 2048, /* ??? */
1799                 &ok);
1800
1801         if (!ok) return((int)n);
1802         p=(unsigned char *)s->init_msg;
1803
1804         l=s->s3->tmp.new_cipher->algorithms;
1805
1806 #ifndef OPENSSL_NO_RSA
1807         if (l & SSL_kRSA)
1808                 {
1809                 /* FIX THIS UP EAY EAY EAY EAY */
1810                 if (s->s3->tmp.use_rsa_tmp)
1811                         {
1812                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1813                                 rsa=s->cert->rsa_tmp;
1814                         /* Don't do a callback because rsa_tmp should
1815                          * be sent already */
1816                         if (rsa == NULL)
1817                                 {
1818                                 al=SSL_AD_HANDSHAKE_FAILURE;
1819                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1820                                 goto f_err;
1821
1822                                 }
1823                         }
1824                 else
1825                         {
1826                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1827                         if (    (pkey == NULL) ||
1828                                 (pkey->type != EVP_PKEY_RSA) ||
1829                                 (pkey->pkey.rsa == NULL))
1830                                 {
1831                                 al=SSL_AD_HANDSHAKE_FAILURE;
1832                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1833                                 goto f_err;
1834                                 }
1835                         rsa=pkey->pkey.rsa;
1836                         }
1837
1838                 /* TLS and [incidentally] DTLS, including pre-0.9.8f */
1839                 if (s->version > SSL3_VERSION &&
1840                     s->client_version != DTLS1_BAD_VER)
1841                         {
1842                         n2s(p,i);
1843                         if (n != i+2)
1844                                 {
1845                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1846                                         {
1847                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1848                                         goto err;
1849                                         }
1850                                 else
1851                                         p-=2;
1852                                 }
1853                         else
1854                                 n=i;
1855                         }
1856
1857                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1858
1859                 al = -1;
1860
1861                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1862                         {
1863                         al=SSL_AD_DECODE_ERROR;
1864                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
1865                         }
1866
1867                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1868                         {
1869                         /* The premaster secret must contain the same version number as the
1870                          * ClientHello to detect version rollback attacks (strangely, the
1871                          * protocol does not offer such protection for DH ciphersuites).
1872                          * However, buggy clients exist that send the negotiated protocol
1873                          * version instead if the server does not support the requested
1874                          * protocol version.
1875                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1876                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1877                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1878                                 {
1879                                 al=SSL_AD_DECODE_ERROR;
1880                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1881
1882                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1883                                  * (http://eprint.iacr.org/2003/052/) exploits the version
1884                                  * number check as a "bad version oracle" -- an alert would
1885                                  * reveal that the plaintext corresponding to some ciphertext
1886                                  * made up by the adversary is properly formatted except
1887                                  * that the version number is wrong.  To avoid such attacks,
1888                                  * we should treat this just like any other decryption error. */
1889                                 }
1890                         }
1891
1892                 if (al != -1)
1893                         {
1894                         /* Some decryption failure -- use random value instead as countermeasure
1895                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1896                          * (see RFC 2246, section 7.4.7.1). */
1897                         ERR_clear_error();
1898                         i = SSL_MAX_MASTER_KEY_LENGTH;
1899                         p[0] = s->client_version >> 8;
1900                         p[1] = s->client_version & 0xff;
1901                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
1902                                 goto err;
1903                         }
1904
1905                 s->session->master_key_length=
1906                         s->method->ssl3_enc->generate_master_secret(s,
1907                                 s->session->master_key,
1908                                 p,i);
1909                 OPENSSL_cleanse(p,i);
1910                 }
1911         else
1912 #endif
1913 #ifndef OPENSSL_NO_DH
1914                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1915                 {
1916                 n2s(p,i);
1917                 if (n != i+2)
1918                         {
1919                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1920                                 {
1921                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1922                                 goto err;
1923                                 }
1924                         else
1925                                 {
1926                                 p-=2;
1927                                 i=(int)n;
1928                                 }
1929                         }
1930
1931                 if (n == 0L) /* the parameters are in the cert */
1932                         {
1933                         al=SSL_AD_HANDSHAKE_FAILURE;
1934                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1935                         goto f_err;
1936                         }
1937                 else
1938                         {
1939                         if (s->s3->tmp.dh == NULL)
1940                                 {
1941                                 al=SSL_AD_HANDSHAKE_FAILURE;
1942                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1943                                 goto f_err;
1944                                 }
1945                         else
1946                                 dh_srvr=s->s3->tmp.dh;
1947                         }
1948
1949                 pub=BN_bin2bn(p,i,NULL);
1950                 if (pub == NULL)
1951                         {
1952                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1953                         goto err;
1954                         }
1955
1956                 i=DH_compute_key(p,pub,dh_srvr);
1957
1958                 if (i <= 0)
1959                         {
1960                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1961                         goto err;
1962                         }
1963
1964                 DH_free(s->s3->tmp.dh);
1965                 s->s3->tmp.dh=NULL;
1966
1967                 BN_clear_free(pub);
1968                 pub=NULL;
1969                 s->session->master_key_length=
1970                         s->method->ssl3_enc->generate_master_secret(s,
1971                                 s->session->master_key,p,i);
1972                 OPENSSL_cleanse(p,i);
1973                 }
1974         else
1975 #endif
1976 #ifndef OPENSSL_NO_KRB5
1977         if (l & SSL_kKRB5)
1978                 {
1979                 krb5_error_code         krb5rc;
1980                 krb5_data               enc_ticket;
1981                 krb5_data               authenticator;
1982                 krb5_data               enc_pms;
1983                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
1984                 EVP_CIPHER_CTX          ciph_ctx;
1985                 EVP_CIPHER              *enc = NULL;
1986                 unsigned char           iv[EVP_MAX_IV_LENGTH];
1987                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
1988                                                + EVP_MAX_BLOCK_LENGTH];
1989                 int                     padl, outl;
1990                 krb5_timestamp          authtime = 0;
1991                 krb5_ticket_times       ttimes;
1992
1993                 EVP_CIPHER_CTX_init(&ciph_ctx);
1994
1995                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
1996
1997                 n2s(p,i);
1998                 enc_ticket.length = i;
1999
2000                 if (n < (int)enc_ticket.length + 6)
2001                         {
2002                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2003                                 SSL_R_DATA_LENGTH_TOO_LONG);
2004                         goto err;
2005                         }
2006
2007                 enc_ticket.data = (char *)p;
2008                 p+=enc_ticket.length;
2009
2010                 n2s(p,i);
2011                 authenticator.length = i;
2012
2013                 if (n < (int)(enc_ticket.length + authenticator.length) + 6)
2014                         {
2015                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2016                                 SSL_R_DATA_LENGTH_TOO_LONG);
2017                         goto err;
2018                         }
2019
2020                 authenticator.data = (char *)p;
2021                 p+=authenticator.length;
2022
2023                 n2s(p,i);
2024                 enc_pms.length = i;
2025                 enc_pms.data = (char *)p;
2026                 p+=enc_pms.length;
2027
2028                 /* Note that the length is checked again below,
2029                 ** after decryption
2030                 */
2031                 if(enc_pms.length > sizeof pms)
2032                         {
2033                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2034                                SSL_R_DATA_LENGTH_TOO_LONG);
2035                         goto err;
2036                         }
2037
2038                 if (n != (long)(enc_ticket.length + authenticator.length +
2039                                                 enc_pms.length + 6))
2040                         {
2041                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2042                                 SSL_R_DATA_LENGTH_TOO_LONG);
2043                         goto err;
2044                         }
2045
2046                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2047                                         &kssl_err)) != 0)
2048                         {
2049 #ifdef KSSL_DEBUG
2050                         printf("kssl_sget_tkt rtn %d [%d]\n",
2051                                 krb5rc, kssl_err.reason);
2052                         if (kssl_err.text)
2053                                 printf("kssl_err text= %s\n", kssl_err.text);
2054 #endif  /* KSSL_DEBUG */
2055                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2056                                 kssl_err.reason);
2057                         goto err;
2058                         }
2059
2060                 /*  Note: no authenticator is not considered an error,
2061                 **  but will return authtime == 0.
2062                 */
2063                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2064                                         &authtime, &kssl_err)) != 0)
2065                         {
2066 #ifdef KSSL_DEBUG
2067                         printf("kssl_check_authent rtn %d [%d]\n",
2068                                 krb5rc, kssl_err.reason);
2069                         if (kssl_err.text)
2070                                 printf("kssl_err text= %s\n", kssl_err.text);
2071 #endif  /* KSSL_DEBUG */
2072                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2073                                 kssl_err.reason);
2074                         goto err;
2075                         }
2076
2077                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2078                         {
2079                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2080                         goto err;
2081                         }
2082
2083 #ifdef KSSL_DEBUG
2084                 kssl_ctx_show(kssl_ctx);
2085 #endif  /* KSSL_DEBUG */
2086
2087                 enc = kssl_map_enc(kssl_ctx->enctype);
2088                 if (enc == NULL)
2089                     goto err;
2090
2091                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2092
2093                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2094                         {
2095                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2096                                 SSL_R_DECRYPTION_FAILED);
2097                         goto err;
2098                         }
2099                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2100                                         (unsigned char *)enc_pms.data, enc_pms.length))
2101                         {
2102                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2103                                 SSL_R_DECRYPTION_FAILED);
2104                         goto err;
2105                         }
2106                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2107                         {
2108                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2109                                 SSL_R_DATA_LENGTH_TOO_LONG);
2110                         goto err;
2111                         }
2112                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2113                         {
2114                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2115                                 SSL_R_DECRYPTION_FAILED);
2116                         goto err;
2117                         }
2118                 outl += padl;
2119                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2120                         {
2121                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2122                                 SSL_R_DATA_LENGTH_TOO_LONG);
2123                         goto err;
2124                         }
2125                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2126                     {
2127                     /* The premaster secret must contain the same version number as the
2128                      * ClientHello to detect version rollback attacks (strangely, the
2129                      * protocol does not offer such protection for DH ciphersuites).
2130                      * However, buggy clients exist that send random bytes instead of
2131                      * the protocol version.
2132                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2133                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2134                      */
2135                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2136                         {
2137                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2138                                SSL_AD_DECODE_ERROR);
2139                         goto err;
2140                         }
2141                     }
2142
2143                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2144
2145                 s->session->master_key_length=
2146                         s->method->ssl3_enc->generate_master_secret(s,
2147                                 s->session->master_key, pms, outl);
2148
2149                 if (kssl_ctx->client_princ)
2150                         {
2151                         size_t len = strlen(kssl_ctx->client_princ);
2152                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2153                                 {
2154                                 s->session->krb5_client_princ_len = len;
2155                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2156                                 }
2157                         }
2158
2159
2160                 /*  Was doing kssl_ctx_free() here,
2161                 **  but it caused problems for apache.
2162                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2163                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2164                 */
2165                 }
2166         else
2167 #endif  /* OPENSSL_NO_KRB5 */
2168
2169 #ifndef OPENSSL_NO_ECDH
2170                 if ((l & SSL_kECDH) || (l & SSL_kECDHE))
2171                 {
2172                 int ret = 1;
2173                 int field_size = 0;
2174                 const EC_KEY   *tkey;
2175                 const EC_GROUP *group;
2176                 const BIGNUM *priv_key;
2177
2178                 /* initialize structures for server's ECDH key pair */
2179                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2180                         {
2181                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2182                             ERR_R_MALLOC_FAILURE);
2183                         goto err;
2184                         }
2185
2186                 /* Let's get server private key and group information */
2187                 if (l & SSL_kECDH)
2188                         {
2189                         /* use the certificate */
2190                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2191                         }
2192                 else
2193                         {
2194                         /* use the ephermeral values we saved when
2195                          * generating the ServerKeyExchange msg.
2196                          */
2197                         tkey = s->s3->tmp.ecdh;
2198                         }
2199
2200                 group    = EC_KEY_get0_group(tkey);
2201                 priv_key = EC_KEY_get0_private_key(tkey);
2202
2203                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2204                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2205                         {
2206                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2207                                ERR_R_EC_LIB);
2208                         goto err;
2209                         }
2210
2211                 /* Let's get client's public key */
2212                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2213                         {
2214                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2215                             ERR_R_MALLOC_FAILURE);
2216                         goto err;
2217                         }
2218
2219                 if (n == 0L)
2220                         {
2221                         /* Client Publickey was in Client Certificate */
2222
2223                          if (l & SSL_kECDHE)
2224                                  {
2225                                  al=SSL_AD_HANDSHAKE_FAILURE;
2226                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2227                                  goto f_err;
2228                                  }
2229                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2230                             == NULL) ||
2231                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2232                                 {
2233                                 /* XXX: For now, we do not support client
2234                                  * authentication using ECDH certificates
2235                                  * so this branch (n == 0L) of the code is
2236                                  * never executed. When that support is
2237                                  * added, we ought to ensure the key
2238                                  * received in the certificate is
2239                                  * authorized for key agreement.
2240                                  * ECDH_compute_key implicitly checks that
2241                                  * the two ECDH shares are for the same
2242                                  * group.
2243                                  */
2244                                 al=SSL_AD_HANDSHAKE_FAILURE;
2245                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2246                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2247                                 goto f_err;
2248                                 }
2249
2250                         if (EC_POINT_copy(clnt_ecpoint,
2251                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2252                                 {
2253                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2254                                         ERR_R_EC_LIB);
2255                                 goto err;
2256                                 }
2257                         ret = 2; /* Skip certificate verify processing */
2258                         }
2259                 else
2260                         {
2261                         /* Get client's public key from encoded point
2262                          * in the ClientKeyExchange message.
2263                          */
2264                         if ((bn_ctx = BN_CTX_new()) == NULL)
2265                                 {
2266                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2267                                     ERR_R_MALLOC_FAILURE);
2268                                 goto err;
2269                                 }
2270
2271                         /* Get encoded point length */
2272                         i = *p;
2273                         p += 1;
2274                         if (EC_POINT_oct2point(group,
2275                             clnt_ecpoint, p, i, bn_ctx) == 0)
2276                                 {
2277                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2278                                     ERR_R_EC_LIB);
2279                                 goto err;
2280                                 }
2281                         /* p is pointing to somewhere in the buffer
2282                          * currently, so set it to the start
2283                          */
2284                         p=(unsigned char *)s->init_buf->data;
2285                         }
2286
2287                 /* Compute the shared pre-master secret */
2288                 field_size = EC_GROUP_get_degree(group);
2289                 if (field_size <= 0)
2290                         {
2291                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2292                                ERR_R_ECDH_LIB);
2293                         goto err;
2294                         }
2295                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2296                 if (i <= 0)
2297                         {
2298                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2299                             ERR_R_ECDH_LIB);
2300                         goto err;
2301                         }
2302
2303                 EVP_PKEY_free(clnt_pub_pkey);
2304                 EC_POINT_free(clnt_ecpoint);
2305                 if (srvr_ecdh != NULL)
2306                         EC_KEY_free(srvr_ecdh);
2307                 BN_CTX_free(bn_ctx);
2308
2309                 /* Compute the master secret */
2310                 s->session->master_key_length = s->method->ssl3_enc-> \
2311                     generate_master_secret(s, s->session->master_key, p, i);
2312
2313                 OPENSSL_cleanse(p, i);
2314                 return (ret);
2315                 }
2316         else
2317 #endif
2318                 {
2319                 al=SSL_AD_HANDSHAKE_FAILURE;
2320                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2321                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2322                 goto f_err;
2323                 }
2324
2325         return(1);
2326 f_err:
2327         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2328 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2329 err:
2330 #endif
2331 #ifndef OPENSSL_NO_ECDH
2332         EVP_PKEY_free(clnt_pub_pkey);
2333         EC_POINT_free(clnt_ecpoint);
2334         if (srvr_ecdh != NULL)
2335                 EC_KEY_free(srvr_ecdh);
2336         BN_CTX_free(bn_ctx);
2337 #endif
2338         return(-1);
2339         }
2340
2341 int ssl3_get_cert_verify(SSL *s)
2342         {
2343         EVP_PKEY *pkey=NULL;
2344         unsigned char *p;
2345         int al,ok,ret=0;
2346         long n;
2347         int type=0,i,j;
2348         X509 *peer;
2349
2350         n=s->method->ssl_get_message(s,
2351                 SSL3_ST_SR_CERT_VRFY_A,
2352                 SSL3_ST_SR_CERT_VRFY_B,
2353                 -1,
2354                 514, /* 514? */
2355                 &ok);
2356
2357         if (!ok) return((int)n);
2358
2359         if (s->session->peer != NULL)
2360                 {
2361                 peer=s->session->peer;
2362                 pkey=X509_get_pubkey(peer);
2363                 type=X509_certificate_type(peer,pkey);
2364                 }
2365         else
2366                 {
2367                 peer=NULL;
2368                 pkey=NULL;
2369                 }
2370
2371         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2372                 {
2373                 s->s3->tmp.reuse_message=1;
2374                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2375                         {
2376                         al=SSL_AD_UNEXPECTED_MESSAGE;
2377                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2378                         goto f_err;
2379                         }
2380                 ret=1;
2381                 goto end;
2382                 }
2383
2384         if (peer == NULL)
2385                 {
2386                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2387                 al=SSL_AD_UNEXPECTED_MESSAGE;
2388                 goto f_err;
2389                 }
2390
2391         if (!(type & EVP_PKT_SIGN))
2392                 {
2393                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2394                 al=SSL_AD_ILLEGAL_PARAMETER;
2395                 goto f_err;
2396                 }
2397
2398         if (s->s3->change_cipher_spec)
2399                 {
2400                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2401                 al=SSL_AD_UNEXPECTED_MESSAGE;
2402                 goto f_err;
2403                 }
2404
2405         /* we now have a signature that we need to verify */
2406         p=(unsigned char *)s->init_msg;
2407         n2s(p,i);
2408         n-=2;
2409         if (i > n)
2410                 {
2411                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2412                 al=SSL_AD_DECODE_ERROR;
2413                 goto f_err;
2414                 }
2415
2416         j=EVP_PKEY_size(pkey);
2417         if ((i > j) || (n > j) || (n <= 0))
2418                 {
2419                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2420                 al=SSL_AD_DECODE_ERROR;
2421                 goto f_err;
2422                 }
2423
2424 #ifndef OPENSSL_NO_RSA
2425         if (pkey->type == EVP_PKEY_RSA)
2426                 {
2427                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2428                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
2429                                                         pkey->pkey.rsa);
2430                 if (i < 0)
2431                         {
2432                         al=SSL_AD_DECRYPT_ERROR;
2433                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2434                         goto f_err;
2435                         }
2436                 if (i == 0)
2437                         {
2438                         al=SSL_AD_DECRYPT_ERROR;
2439                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2440                         goto f_err;
2441                         }
2442                 }
2443         else
2444 #endif
2445 #ifndef OPENSSL_NO_DSA
2446                 if (pkey->type == EVP_PKEY_DSA)
2447                 {
2448                 j=DSA_verify(pkey->save_type,
2449                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2450                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2451                 if (j <= 0)
2452                         {
2453                         /* bad signature */
2454                         al=SSL_AD_DECRYPT_ERROR;
2455                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2456                         goto f_err;
2457                         }
2458                 }
2459         else
2460 #endif
2461 #ifndef OPENSSL_NO_ECDSA
2462                 if (pkey->type == EVP_PKEY_EC)
2463                 {
2464                 j=ECDSA_verify(pkey->save_type,
2465                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2466                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2467                 if (j <= 0)
2468                         {
2469                         /* bad signature */
2470                         al=SSL_AD_DECRYPT_ERROR;
2471                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2472                             SSL_R_BAD_ECDSA_SIGNATURE);
2473                         goto f_err;
2474                         }
2475                 }
2476         else
2477 #endif
2478                 {
2479                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2480                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2481                 goto f_err;
2482                 }
2483
2484
2485         ret=1;
2486         if (0)
2487                 {
2488 f_err:
2489                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2490                 }
2491 end:
2492         EVP_PKEY_free(pkey);
2493         return(ret);
2494         }
2495
2496 int ssl3_get_client_certificate(SSL *s)
2497         {
2498         int i,ok,al,ret= -1;
2499         X509 *x=NULL;
2500         unsigned long l,nc,llen,n;
2501         const unsigned char *p,*q;
2502         unsigned char *d;
2503         STACK_OF(X509) *sk=NULL;
2504
2505         n=s->method->ssl_get_message(s,
2506                 SSL3_ST_SR_CERT_A,
2507                 SSL3_ST_SR_CERT_B,
2508                 -1,
2509                 s->max_cert_list,
2510                 &ok);
2511
2512         if (!ok) return((int)n);
2513
2514         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2515                 {
2516                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2517                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2518                         {
2519                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2520                         al=SSL_AD_HANDSHAKE_FAILURE;
2521                         goto f_err;
2522                         }
2523                 /* If tls asked for a client cert, the client must return a 0 list */
2524                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2525                         {
2526                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2527                         al=SSL_AD_UNEXPECTED_MESSAGE;
2528                         goto f_err;
2529                         }
2530                 s->s3->tmp.reuse_message=1;
2531                 return(1);
2532                 }
2533
2534         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2535                 {
2536                 al=SSL_AD_UNEXPECTED_MESSAGE;
2537                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2538                 goto f_err;
2539                 }
2540         p=d=(unsigned char *)s->init_msg;
2541
2542         if ((sk=sk_X509_new_null()) == NULL)
2543                 {
2544                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2545                 goto err;
2546                 }
2547
2548         n2l3(p,llen);
2549         if (llen+3 != n)
2550                 {
2551                 al=SSL_AD_DECODE_ERROR;
2552                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2553                 goto f_err;
2554                 }
2555         for (nc=0; nc<llen; )
2556                 {
2557                 n2l3(p,l);
2558                 if ((l+nc+3) > llen)
2559                         {
2560                         al=SSL_AD_DECODE_ERROR;
2561                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2562                         goto f_err;
2563                         }
2564
2565                 q=p;
2566                 x=d2i_X509(NULL,&p,l);
2567                 if (x == NULL)
2568                         {
2569                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2570                         goto err;
2571                         }
2572                 if (p != (q+l))
2573                         {
2574                         al=SSL_AD_DECODE_ERROR;
2575                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2576                         goto f_err;
2577                         }
2578                 if (!sk_X509_push(sk,x))
2579                         {
2580                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2581                         goto err;
2582                         }
2583                 x=NULL;
2584                 nc+=l+3;
2585                 }
2586
2587         if (sk_X509_num(sk) <= 0)
2588                 {
2589                 /* TLS does not mind 0 certs returned */
2590                 if (s->version == SSL3_VERSION)
2591                         {
2592                         al=SSL_AD_HANDSHAKE_FAILURE;
2593                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2594                         goto f_err;
2595                         }
2596                 /* Fail for TLS only if we required a certificate */
2597                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2598                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2599                         {
2600                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2601                         al=SSL_AD_HANDSHAKE_FAILURE;
2602                         goto f_err;
2603                         }
2604                 }
2605         else
2606                 {
2607                 i=ssl_verify_cert_chain(s,sk);
2608                 if (i <= 0)
2609                         {
2610                         al=ssl_verify_alarm_type(s->verify_result);
2611                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2612                         goto f_err;
2613                         }
2614                 }
2615
2616         if (s->session->peer != NULL) /* This should not be needed */
2617                 X509_free(s->session->peer);
2618         s->session->peer=sk_X509_shift(sk);
2619         s->session->verify_result = s->verify_result;
2620
2621         /* With the current implementation, sess_cert will always be NULL
2622          * when we arrive here. */
2623         if (s->session->sess_cert == NULL)
2624                 {
2625                 s->session->sess_cert = ssl_sess_cert_new();
2626                 if (s->session->sess_cert == NULL)
2627                         {
2628                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2629                         goto err;
2630                         }
2631                 }
2632         if (s->session->sess_cert->cert_chain != NULL)
2633                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2634         s->session->sess_cert->cert_chain=sk;
2635         /* Inconsistency alert: cert_chain does *not* include the
2636          * peer's own certificate, while we do include it in s3_clnt.c */
2637
2638         sk=NULL;
2639
2640         ret=1;
2641         if (0)
2642                 {
2643 f_err:
2644                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2645                 }
2646 err:
2647         if (x != NULL) X509_free(x);
2648         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2649         return(ret);
2650         }
2651
2652 int ssl3_send_server_certificate(SSL *s)
2653         {
2654         unsigned long l;
2655         X509 *x;
2656
2657         if (s->state == SSL3_ST_SW_CERT_A)
2658                 {
2659                 x=ssl_get_server_send_cert(s);
2660                 if (x == NULL &&
2661                         /* VRS: allow null cert if auth == KRB5 */
2662                         (s->s3->tmp.new_cipher->algorithms
2663                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
2664                         != (SSL_aKRB5|SSL_kKRB5))
2665                         {
2666                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2667                         return(0);
2668                         }
2669
2670                 l=ssl3_output_cert_chain(s,x);
2671                 s->state=SSL3_ST_SW_CERT_B;
2672                 s->init_num=(int)l;
2673                 s->init_off=0;
2674                 }
2675
2676         /* SSL3_ST_SW_CERT_B */
2677         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2678         }
2679
2680
2681 #ifndef OPENSSL_NO_ECDH
2682 /* This is the complement of curve_id2nid in s3_clnt.c. */
2683 static int nid2curve_id(int nid)
2684 {
2685         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2686          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2687         switch (nid) {
2688         case NID_sect163k1: /* sect163k1 (1) */
2689                 return 1;
2690         case NID_sect163r1: /* sect163r1 (2) */
2691                 return 2;
2692         case NID_sect163r2: /* sect163r2 (3) */
2693                 return 3;
2694         case NID_sect193r1: /* sect193r1 (4) */
2695                 return 4;
2696         case NID_sect193r2: /* sect193r2 (5) */
2697                 return 5;
2698         case NID_sect233k1: /* sect233k1 (6) */
2699                 return 6;
2700         case NID_sect233r1: /* sect233r1 (7) */
2701                 return 7;
2702         case NID_sect239k1: /* sect239k1 (8) */
2703                 return 8;
2704         case NID_sect283k1: /* sect283k1 (9) */
2705                 return 9;
2706         case NID_sect283r1: /* sect283r1 (10) */
2707                 return 10;
2708         case NID_sect409k1: /* sect409k1 (11) */
2709                 return 11;
2710         case NID_sect409r1: /* sect409r1 (12) */
2711                 return 12;
2712         case NID_sect571k1: /* sect571k1 (13) */
2713                 return 13;
2714         case NID_sect571r1: /* sect571r1 (14) */
2715                 return 14;
2716         case NID_secp160k1: /* secp160k1 (15) */
2717                 return 15;
2718         case NID_secp160r1: /* secp160r1 (16) */
2719                 return 16;
2720         case NID_secp160r2: /* secp160r2 (17) */
2721                 return 17;
2722         case NID_secp192k1: /* secp192k1 (18) */
2723                 return 18;
2724         case NID_X9_62_prime192v1: /* secp192r1 (19) */
2725                 return 19;
2726         case NID_secp224k1: /* secp224k1 (20) */
2727                 return 20;
2728         case NID_secp224r1: /* secp224r1 (21) */
2729                 return 21;
2730         case NID_secp256k1: /* secp256k1 (22) */
2731                 return 22;
2732         case NID_X9_62_prime256v1: /* secp256r1 (23) */
2733                 return 23;
2734         case NID_secp384r1: /* secp384r1 (24) */
2735                 return 24;
2736         case NID_secp521r1:  /* secp521r1 (25) */
2737                 return 25;
2738         default:
2739                 return 0;
2740         }
2741 }
2742 #endif
2743 #ifndef OPENSSL_NO_TLSEXT
2744 int ssl3_send_newsession_ticket(SSL *s)
2745         {
2746         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
2747                 {
2748                 unsigned char *p, *senc, *macstart;
2749                 int len, slen;
2750                 unsigned int hlen;
2751                 EVP_CIPHER_CTX ctx;
2752                 HMAC_CTX hctx;
2753                 SSL_CTX *tctx = s->initial_ctx;
2754                 unsigned char iv[EVP_MAX_IV_LENGTH];
2755                 unsigned char key_name[16];
2756
2757                 /* get session encoding length */
2758                 slen = i2d_SSL_SESSION(s->session, NULL);
2759                 /* Some length values are 16 bits, so forget it if session is
2760                  * too long
2761                  */
2762                 if (slen > 0xFF00)
2763                         return -1;
2764                 /* Grow buffer if need be: the length calculation is as
2765                  * follows 1 (size of message name) + 3 (message length
2766                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
2767                  * 16 (key name) + max_iv_len (iv length) +
2768                  * session_length + max_enc_block_size (max encrypted session
2769                  * length) + max_md_size (HMAC).
2770                  */
2771                 if (!BUF_MEM_grow(s->init_buf,
2772                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
2773                         EVP_MAX_MD_SIZE + slen))
2774                         return -1;
2775                 senc = OPENSSL_malloc(slen);
2776                 if (!senc)
2777                         return -1;
2778                 p = senc;
2779                 i2d_SSL_SESSION(s->session, &p);
2780
2781                 p=(unsigned char *)s->init_buf->data;
2782                 /* do the header */
2783                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
2784                 /* Skip message length for now */
2785                 p += 3;
2786                 EVP_CIPHER_CTX_init(&ctx);
2787                 HMAC_CTX_init(&hctx);
2788                 /* Initialize HMAC and cipher contexts. If callback present
2789                  * it does all the work otherwise use generated values
2790                  * from parent ctx.
2791                  */
2792                 if (tctx->tlsext_ticket_key_cb)
2793                         {
2794                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
2795                                                          &hctx, 1) < 0)
2796                                 {
2797                                 OPENSSL_free(senc);
2798                                 return -1;
2799                                 }
2800                         }
2801                 else
2802                         {
2803                         RAND_pseudo_bytes(iv, 16);
2804                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
2805                                         tctx->tlsext_tick_aes_key, iv);
2806                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
2807                                         tlsext_tick_md(), NULL);
2808                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
2809                         }
2810                 l2n(s->session->tlsext_tick_lifetime_hint, p);
2811                 /* Skip ticket length for now */
2812                 p += 2;
2813                 /* Output key name */
2814                 macstart = p;
2815                 memcpy(p, key_name, 16);
2816                 p += 16;
2817                 /* output IV */
2818                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
2819                 p += EVP_CIPHER_CTX_iv_length(&ctx);
2820                 /* Encrypt session data */
2821                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
2822                 p += len;
2823                 EVP_EncryptFinal(&ctx, p, &len);
2824                 p += len;
2825                 EVP_CIPHER_CTX_cleanup(&ctx);
2826
2827                 HMAC_Update(&hctx, macstart, p - macstart);
2828                 HMAC_Final(&hctx, p, &hlen);
2829                 HMAC_CTX_cleanup(&hctx);
2830
2831                 p += hlen;
2832                 /* Now write out lengths: p points to end of data written */
2833                 /* Total length */
2834                 len = p - (unsigned char *)s->init_buf->data;
2835                 p=(unsigned char *)s->init_buf->data + 1;
2836                 l2n3(len - 4, p); /* Message length */
2837                 p += 4;
2838                 s2n(len - 10, p);  /* Ticket length */
2839
2840                 /* number of bytes to write */
2841                 s->init_num= len;
2842                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
2843                 s->init_off=0;
2844                 OPENSSL_free(senc);
2845                 }
2846
2847         /* SSL3_ST_SW_SESSION_TICKET_B */
2848         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2849         }
2850
2851 int ssl3_send_cert_status(SSL *s)
2852         {
2853         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
2854                 {
2855                 unsigned char *p;
2856                 /* Grow buffer if need be: the length calculation is as
2857                  * follows 1 (message type) + 3 (message length) +
2858                  * 1 (ocsp response type) + 3 (ocsp response length)
2859                  * + (ocsp response)
2860                  */
2861                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
2862                         return -1;
2863
2864                 p=(unsigned char *)s->init_buf->data;
2865
2866                 /* do the header */
2867                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
2868                 /* message length */
2869                 l2n3(s->tlsext_ocsp_resplen + 4, p);
2870                 /* status type */
2871                 *(p++)= s->tlsext_status_type;
2872                 /* length of OCSP response */
2873                 l2n3(s->tlsext_ocsp_resplen, p);
2874                 /* actual response */
2875                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
2876                 /* number of bytes to write */
2877                 s->init_num = 8 + s->tlsext_ocsp_resplen;
2878                 s->state=SSL3_ST_SW_CERT_STATUS_B;
2879                 s->init_off = 0;
2880                 }
2881
2882         /* SSL3_ST_SW_CERT_STATUS_B */
2883         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2884         }
2885 #endif