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         /* We only allow the client to restart the handshake once per
 702          * negotiation. */
 703         if (s->s3->flags & SSL3_FLAGS_SGC_RESTART_DONE)
 704                 {
 705                 SSLerr(SSL_F_SSL3_CHECK_CLIENT_HELLO, SSL_R_MULTIPLE_SGC_RESTARTS);
 706                 return -1;
 707                 }
 708
 709         /* this function is called when we really expect a Certificate message,
 710          * so permit appropriate message length */
 711         n=s->method->ssl_get_message(s,
 712                 SSL3_ST_SR_CERT_A,
 713                 SSL3_ST_SR_CERT_B,
 714                 -1,
 715                 s->max_cert_list,
 716                 &ok);
 717         if (!ok) return((int)n);
 718         s->s3->tmp.reuse_message = 1;
 719         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 720                 {
 721                 /* Throw away what we have done so far in the current handshake,
 722                  * which will now be aborted. (A full SSL_clear would be too much.)
 723                  * I hope that tmp.dh is the only thing that may need to be cleared
 724                  * when a handshake is not completed ... */
 725 #ifndef OPENSSL_NO_DH
 726                 if (s->s3->tmp.dh != NULL)
 727                         {
 728                         DH_free(s->s3->tmp.dh);
 729                         s->s3->tmp.dh = NULL;
 730                         }
 731 #endif
 732                 s->s3->flags |= SSL3_FLAGS_SGC_RESTART_DONE;
 733                 return 2;
 734                 }
 735         return 1;
 736 }
 737
 738 int ssl3_get_client_hello(SSL *s)
 739         {
 740         int i,j,ok,al,ret= -1;
 741         unsigned int cookie_len;
 742         long n;
 743         unsigned long id;
 744         unsigned char *p,*d,*q;
 745         SSL_CIPHER *c;
 746 #ifndef OPENSSL_NO_COMP
 747         SSL_COMP *comp=NULL;
 748 #endif
 749         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 750
 751         /* We do this so that we will respond with our native type.
 752          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 753          * This down switching should be handled by a different method.
 754          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 755          * TLSv1.
 756          */
 757         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 758                 {
 759                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 760                 }
 761         s->first_packet=1;
 762         n=s->method->ssl_get_message(s,
 763                 SSL3_ST_SR_CLNT_HELLO_B,
 764                 SSL3_ST_SR_CLNT_HELLO_C,
 765                 SSL3_MT_CLIENT_HELLO,
 766                 SSL3_RT_MAX_PLAIN_LENGTH,
 767                 &ok);
 768
 769         if (!ok) return((int)n);
 770         s->first_packet=0;
 771         d=p=(unsigned char *)s->init_msg;
 772
 773         /* use version from inside client hello, not from record header
 774          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 775         s->client_version=(((int)p[0])<<8)|(int)p[1];
 776         p+=2;
 777
 778         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 779             (s->version != DTLS1_VERSION && s->client_version < s->version))
 780                 {
 781                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 782                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 783                         {
 784                         /* similar to ssl3_get_record, send alert using remote version number */
 785                         s->version = s->client_version;
 786                         }
 787                 al = SSL_AD_PROTOCOL_VERSION;
 788                 goto f_err;
 789                 }
 790
 791         /* If we require cookies and this ClientHello doesn't
 792          * contain one, just return since we do not want to
 793          * allocate any memory yet. So check cookie length...
 794          */
 795         if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE)
 796                 {
 797                 unsigned int session_length, cookie_length;
 798
 799                 session_length = *(p + SSL3_RANDOM_SIZE);
 800                 cookie_length = *(p + SSL3_RANDOM_SIZE + session_length + 1);
 801
 802                 if (cookie_length == 0)
 803                         return 1;
 804                 }
 805
 806         /* load the client random */
 807         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 808         p+=SSL3_RANDOM_SIZE;
 809
 810         /* get the session-id */
 811         j= *(p++);
 812
 813         s->hit=0;
 814         /* Versions before 0.9.7 always allow session reuse during renegotiation
 815          * (i.e. when s->new_session is true), option
 816          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
 817          * Maybe this optional behaviour should always have been the default,
 818          * but we cannot safely change the default behaviour (or new applications
 819          * might be written that become totally unsecure when compiled with
 820          * an earlier library version)
 821          */
 822         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 823                 {
 824                 if (!ssl_get_new_session(s,1))
 825                         goto err;
 826                 }
 827         else
 828                 {
 829                 i=ssl_get_prev_session(s, p, j, d + n);
 830                 if (i == 1)
 831                         { /* previous session */
 832                         s->hit=1;
 833                         }
 834                 else if (i == -1)
 835                         goto err;
 836                 else /* i == 0 */
 837                         {
 838                         if (!ssl_get_new_session(s,1))
 839                                 goto err;
 840                         }
 841                 }
 842
 843         p+=j;
 844
 845         if (s->version == DTLS1_VERSION || s->version == DTLS1_BAD_VER)
 846                 {
 847                 /* cookie stuff */
 848                 cookie_len = *(p++);
 849
 850                 /*
 851                  * The ClientHello may contain a cookie even if the
 852                  * HelloVerify message has not been sent--make sure that it
 853                  * does not cause an overflow.
 854                  */
 855                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
 856                         {
 857                         /* too much data */
 858                         al = SSL_AD_DECODE_ERROR;
 859                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 860                         goto f_err;
 861                         }
 862
 863                 /* verify the cookie if appropriate option is set. */
 864                 if ((SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 865                         cookie_len > 0)
 866                         {
 867                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
 868
 869                         if ( s->ctx->app_verify_cookie_cb != NULL)
 870                                 {
 871                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
 872                                         cookie_len) == 0)
 873                                         {
 874                                         al=SSL_AD_HANDSHAKE_FAILURE;
 875                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 876                                                 SSL_R_COOKIE_MISMATCH);
 877                                         goto f_err;
 878                                         }
 879                                 /* else cookie verification succeeded */
 880                                 }
 881                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
 882                                                   s->d1->cookie_len) != 0) /* default verification */
 883                                 {
 884                                         al=SSL_AD_HANDSHAKE_FAILURE;
 885                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 886                                                 SSL_R_COOKIE_MISMATCH);
 887                                         goto f_err;
 888                                 }
 889
 890                         ret = 2;
 891                         }
 892
 893                 p += cookie_len;
 894                 }
 895
 896         n2s(p,i);
 897         if ((i == 0) && (j != 0))
 898                 {
 899                 /* we need a cipher if we are not resuming a session */
 900                 al=SSL_AD_ILLEGAL_PARAMETER;
 901                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 902                 goto f_err;
 903                 }
 904         if ((p+i) >= (d+n))
 905                 {
 906                 /* not enough data */
 907                 al=SSL_AD_DECODE_ERROR;
 908                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 909                 goto f_err;
 910                 }
 911         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 912                 == NULL))
 913                 {
 914                 goto err;
 915                 }
 916         p+=i;
 917
 918         /* If it is a hit, check that the cipher is in the list */
 919         if ((s->hit) && (i > 0))
 920                 {
 921                 j=0;
 922                 id=s->session->cipher->id;
 923
 924 #ifdef CIPHER_DEBUG
 925                 printf("client sent %d ciphers\n",sk_num(ciphers));
 926 #endif
 927                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 928                         {
 929                         c=sk_SSL_CIPHER_value(ciphers,i);
 930 #ifdef CIPHER_DEBUG
 931                         printf("client [%2d of %2d]:%s\n",
 932                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 933 #endif
 934                         if (c->id == id)
 935                                 {
 936                                 j=1;
 937                                 break;
 938                                 }
 939                         }
 940 /* Disabled because it can be used in a ciphersuite downgrade
 941  * attack: CVE-2010-4180.
 942  */
 943 #if 0
 944                 if (j == 0 && (s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 945                         {
 946                         /* Special case as client bug workaround: the previously used cipher may
 947                          * not be in the current list, the client instead might be trying to
 948                          * continue using a cipher that before wasn't chosen due to server
 949                          * preferences.  We'll have to reject the connection if the cipher is not
 950                          * enabled, though. */
 951                         c = sk_SSL_CIPHER_value(ciphers, 0);
 952                         if (sk_SSL_CIPHER_find(SSL_get_ciphers(s), c) >= 0)
 953                                 {
 954                                 s->session->cipher = c;
 955                                 j = 1;
 956                                 }
 957                         }
 958 #endif
 959                 if (j == 0)
 960                         {
 961                         /* we need to have the cipher in the cipher
 962                          * list if we are asked to reuse it */
 963                         al=SSL_AD_ILLEGAL_PARAMETER;
 964                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 965                         goto f_err;
 966                         }
 967                 }
 968
 969         /* compression */
 970         i= *(p++);
 971         if ((p+i) > (d+n))
 972                 {
 973                 /* not enough data */
 974                 al=SSL_AD_DECODE_ERROR;
 975                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 976                 goto f_err;
 977                 }
 978         q=p;
 979         for (j=0; j<i; j++)
 980                 {
 981                 if (p[j] == 0) break;
 982                 }
 983
 984         p+=i;
 985         if (j >= i)
 986                 {
 987                 /* no compress */
 988                 al=SSL_AD_DECODE_ERROR;
 989                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 990                 goto f_err;
 991                 }
 992
 993 #ifndef OPENSSL_NO_TLSEXT
 994         /* TLS extensions*/
 995         if (s->version >= SSL3_VERSION)
 996                 {
 997                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
 998                         {
 999                         /* 'al' set by ssl_parse_clienthello_tlsext */
1000                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
1001                         goto f_err;
1002                         }
1003                 }
1004                 if (ssl_check_clienthello_tlsext(s) <= 0) {
1005                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
1006                         goto err;
1007                 }
1008 #endif
1009         /* Worst case, we will use the NULL compression, but if we have other
1010          * options, we will now look for them.  We have i-1 compression
1011          * algorithms from the client, starting at q. */
1012         s->s3->tmp.new_compression=NULL;
1013 #ifndef OPENSSL_NO_COMP
1014         if (s->ctx->comp_methods != NULL)
1015                 { /* See if we have a match */
1016                 int m,nn,o,v,done=0;
1017
1018                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
1019                 for (m=0; m<nn; m++)
1020                         {
1021                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
1022                         v=comp->id;
1023                         for (o=0; o<i; o++)
1024                                 {
1025                                 if (v == q[o])
1026                                         {
1027                                         done=1;
1028                                         break;
1029                                         }
1030                                 }
1031                         if (done) break;
1032                         }
1033                 if (done)
1034                         s->s3->tmp.new_compression=comp;
1035                 else
1036                         comp=NULL;
1037                 }
1038 #endif
1039
1040         /* TLS does not mind if there is extra stuff */
1041 #if 0   /* SSL 3.0 does not mind either, so we should disable this test
1042          * (was enabled in 0.9.6d through 0.9.6j and 0.9.7 through 0.9.7b,
1043          * in earlier SSLeay/OpenSSL releases this test existed but was buggy) */
1044         if (s->version == SSL3_VERSION)
1045                 {
1046                 if (p < (d+n))
1047                         {
1048                         /* wrong number of bytes,
1049                          * there could be more to follow */
1050                         al=SSL_AD_DECODE_ERROR;
1051                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1052                         goto f_err;
1053                         }
1054                 }
1055 #endif
1056
1057         /* Given s->session->ciphers and SSL_get_ciphers, we must
1058          * pick a cipher */
1059
1060         if (!s->hit)
1061                 {
1062 #ifdef OPENSSL_NO_COMP
1063                 s->session->compress_meth=0;
1064 #else
1065                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1066 #endif
1067                 if (s->session->ciphers != NULL)
1068                         sk_SSL_CIPHER_free(s->session->ciphers);
1069                 s->session->ciphers=ciphers;
1070                 if (ciphers == NULL)
1071                         {
1072                         al=SSL_AD_ILLEGAL_PARAMETER;
1073                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1074                         goto f_err;
1075                         }
1076                 ciphers=NULL;
1077                 c=ssl3_choose_cipher(s,s->session->ciphers,
1078                                      SSL_get_ciphers(s));
1079
1080                 if (c == NULL)
1081                         {
1082                         al=SSL_AD_HANDSHAKE_FAILURE;
1083                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1084                         goto f_err;
1085                         }
1086                 s->s3->tmp.new_cipher=c;
1087                 }
1088         else
1089                 {
1090                 /* Session-id reuse */
1091 #ifdef REUSE_CIPHER_BUG
1092                 STACK_OF(SSL_CIPHER) *sk;
1093                 SSL_CIPHER *nc=NULL;
1094                 SSL_CIPHER *ec=NULL;
1095
1096                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1097                         {
1098                         sk=s->session->ciphers;
1099                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1100                                 {
1101                                 c=sk_SSL_CIPHER_value(sk,i);
1102                                 if (c->algorithms & SSL_eNULL)
1103                                         nc=c;
1104                                 if (SSL_C_IS_EXPORT(c))
1105                                         ec=c;
1106                                 }
1107                         if (nc != NULL)
1108                                 s->s3->tmp.new_cipher=nc;
1109                         else if (ec != NULL)
1110                                 s->s3->tmp.new_cipher=ec;
1111                         else
1112                                 s->s3->tmp.new_cipher=s->session->cipher;
1113                         }
1114                 else
1115 #endif
1116                 s->s3->tmp.new_cipher=s->session->cipher;
1117                 }
1118
1119         /* we now have the following setup.
1120          * client_random
1121          * cipher_list          - our prefered list of ciphers
1122          * ciphers              - the clients prefered list of ciphers
1123          * compression          - basically ignored right now
1124          * ssl version is set   - sslv3
1125          * s->session           - The ssl session has been setup.
1126          * s->hit               - session reuse flag
1127          * s->tmp.new_cipher    - the new cipher to use.
1128          */
1129
1130         if (ret < 0) ret=1;
1131         if (0)
1132                 {
1133 f_err:
1134                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1135                 }
1136 err:
1137         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1138         return(ret);
1139         }
1140
1141 int ssl3_send_server_hello(SSL *s)
1142         {
1143         unsigned char *buf;
1144         unsigned char *p,*d;
1145         int i,sl;
1146         unsigned long l,Time;
1147
1148         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1149                 {
1150                 buf=(unsigned char *)s->init_buf->data;
1151                 p=s->s3->server_random;
1152                 Time=(unsigned long)time(NULL);                 /* Time */
1153                 l2n(Time,p);
1154                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1155                         return -1;
1156                 /* Do the message type and length last */
1157                 d=p= &(buf[4]);
1158
1159                 *(p++)=s->version>>8;
1160                 *(p++)=s->version&0xff;
1161
1162                 /* Random stuff */
1163                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1164                 p+=SSL3_RANDOM_SIZE;
1165
1166                 /* now in theory we have 3 options to sending back the
1167                  * session id.  If it is a re-use, we send back the
1168                  * old session-id, if it is a new session, we send
1169                  * back the new session-id or we send back a 0 length
1170                  * session-id if we want it to be single use.
1171                  * Currently I will not implement the '0' length session-id
1172                  * 12-Jan-98 - I'll now support the '0' length stuff.
1173                  *
1174                  * We also have an additional case where stateless session
1175                  * resumption is successful: we always send back the old
1176                  * session id. In this case s->hit is non zero: this can
1177                  * only happen if stateless session resumption is succesful
1178                  * if session caching is disabled so existing functionality
1179                  * is unaffected.
1180                  */
1181                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1182                         && !s->hit)
1183                         s->session->session_id_length=0;
1184
1185                 sl=s->session->session_id_length;
1186                 if (sl > (int)sizeof(s->session->session_id))
1187                         {
1188                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1189                         return -1;
1190                         }
1191                 *(p++)=sl;
1192                 memcpy(p,s->session->session_id,sl);
1193                 p+=sl;
1194
1195                 /* put the cipher */
1196                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1197                 p+=i;
1198
1199                 /* put the compression method */
1200 #ifdef OPENSSL_NO_COMP
1201                         *(p++)=0;
1202 #else
1203                 if (s->s3->tmp.new_compression == NULL)
1204                         *(p++)=0;
1205                 else
1206                         *(p++)=s->s3->tmp.new_compression->id;
1207 #endif
1208 #ifndef OPENSSL_NO_TLSEXT
1209                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1210                         {
1211                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1212                         return -1;
1213                         }
1214 #endif
1215                 /* do the header */
1216                 l=(p-d);
1217                 d=buf;
1218                 *(d++)=SSL3_MT_SERVER_HELLO;
1219                 l2n3(l,d);
1220
1221                 s->state=SSL3_ST_SW_SRVR_HELLO_B;
1222                 /* number of bytes to write */
1223                 s->init_num=p-buf;
1224                 s->init_off=0;
1225                 }
1226
1227         /* SSL3_ST_SW_SRVR_HELLO_B */
1228         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1229         }
1230
1231 int ssl3_send_server_done(SSL *s)
1232         {
1233         unsigned char *p;
1234
1235         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1236                 {
1237                 p=(unsigned char *)s->init_buf->data;
1238
1239                 /* do the header */
1240                 *(p++)=SSL3_MT_SERVER_DONE;
1241                 *(p++)=0;
1242                 *(p++)=0;
1243                 *(p++)=0;
1244
1245                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1246                 /* number of bytes to write */
1247                 s->init_num=4;
1248                 s->init_off=0;
1249                 }
1250
1251         /* SSL3_ST_SW_SRVR_DONE_B */
1252         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1253         }
1254
1255 int ssl3_send_server_key_exchange(SSL *s)
1256         {
1257 #ifndef OPENSSL_NO_RSA
1258         unsigned char *q;
1259         int j,num;
1260         RSA *rsa;
1261         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1262         unsigned int u;
1263 #endif
1264 #ifndef OPENSSL_NO_DH
1265         DH *dh=NULL,*dhp;
1266 #endif
1267 #ifndef OPENSSL_NO_ECDH
1268         EC_KEY *ecdh=NULL, *ecdhp;
1269         unsigned char *encodedPoint = NULL;
1270         int encodedlen = 0;
1271         int curve_id = 0;
1272         BN_CTX *bn_ctx = NULL;
1273 #endif
1274         EVP_PKEY *pkey;
1275         unsigned char *p,*d;
1276         int al,i;
1277         unsigned long type;
1278         int n;
1279         CERT *cert;
1280         BIGNUM *r[4];
1281         int nr[4],kn;
1282         BUF_MEM *buf;
1283         EVP_MD_CTX md_ctx;
1284
1285         EVP_MD_CTX_init(&md_ctx);
1286         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1287                 {
1288                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1289                 cert=s->cert;
1290
1291                 buf=s->init_buf;
1292
1293                 r[0]=r[1]=r[2]=r[3]=NULL;
1294                 n=0;
1295 #ifndef OPENSSL_NO_RSA
1296                 if (type & SSL_kRSA)
1297                         {
1298                         rsa=cert->rsa_tmp;
1299                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1300                                 {
1301                                 rsa=s->cert->rsa_tmp_cb(s,
1302                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1303                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1304                                 if(rsa == NULL)
1305                                 {
1306                                         al=SSL_AD_HANDSHAKE_FAILURE;
1307                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1308                                         goto f_err;
1309                                 }
1310                                 RSA_up_ref(rsa);
1311                                 cert->rsa_tmp=rsa;
1312                                 }
1313                         if (rsa == NULL)
1314                                 {
1315                                 al=SSL_AD_HANDSHAKE_FAILURE;
1316                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1317                                 goto f_err;
1318                                 }
1319                         r[0]=rsa->n;
1320                         r[1]=rsa->e;
1321                         s->s3->tmp.use_rsa_tmp=1;
1322                         }
1323                 else
1324 #endif
1325 #ifndef OPENSSL_NO_DH
1326                         if (type & SSL_kEDH)
1327                         {
1328                         dhp=cert->dh_tmp;
1329                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1330                                 dhp=s->cert->dh_tmp_cb(s,
1331                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1332                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1333                         if (dhp == NULL)
1334                                 {
1335                                 al=SSL_AD_HANDSHAKE_FAILURE;
1336                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1337                                 goto f_err;
1338                                 }
1339
1340                         if (s->s3->tmp.dh != NULL)
1341                                 {
1342                                 DH_free(dh);
1343                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1344                                 goto err;
1345                                 }
1346
1347                         if ((dh=DHparams_dup(dhp)) == NULL)
1348                                 {
1349                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1350                                 goto err;
1351                                 }
1352
1353                         s->s3->tmp.dh=dh;
1354                         if ((dhp->pub_key == NULL ||
1355                              dhp->priv_key == NULL ||
1356                              (s->options & SSL_OP_SINGLE_DH_USE)))
1357                                 {
1358                                 if(!DH_generate_key(dh))
1359                                     {
1360                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1361                                            ERR_R_DH_LIB);
1362                                     goto err;
1363                                     }
1364                                 }
1365                         else
1366                                 {
1367                                 dh->pub_key=BN_dup(dhp->pub_key);
1368                                 dh->priv_key=BN_dup(dhp->priv_key);
1369                                 if ((dh->pub_key == NULL) ||
1370                                         (dh->priv_key == NULL))
1371                                         {
1372                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1373                                         goto err;
1374                                         }
1375                                 }
1376                         r[0]=dh->p;
1377                         r[1]=dh->g;
1378                         r[2]=dh->pub_key;
1379                         }
1380                 else
1381 #endif
1382 #ifndef OPENSSL_NO_ECDH
1383                         if (type & SSL_kECDHE)
1384                         {
1385                         const EC_GROUP *group;
1386
1387                         ecdhp=cert->ecdh_tmp;
1388                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1389                                 {
1390                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1391                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1392                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1393                                 }
1394                         if (ecdhp == NULL)
1395                                 {
1396                                 al=SSL_AD_HANDSHAKE_FAILURE;
1397                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1398                                 goto f_err;
1399                                 }
1400
1401                         if (s->s3->tmp.ecdh != NULL)
1402                                 {
1403                                 EC_KEY_free(s->s3->tmp.ecdh);
1404                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1405                                 goto err;
1406                                 }
1407
1408                         /* Duplicate the ECDH structure. */
1409                         if (ecdhp == NULL)
1410                                 {
1411                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1412                                 goto err;
1413                                 }
1414                         if (!EC_KEY_up_ref(ecdhp))
1415                                 {
1416                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1417                                 goto err;
1418                                 }
1419                         ecdh = ecdhp;
1420
1421                         s->s3->tmp.ecdh=ecdh;
1422                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1423                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1424                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1425                                 {
1426                                 if(!EC_KEY_generate_key(ecdh))
1427                                     {
1428                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1429                                     goto err;
1430                                     }
1431                                 }
1432
1433                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1434                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1435                             (EC_KEY_get0_private_key(ecdh) == NULL))
1436                                 {
1437                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1438                                 goto err;
1439                                 }
1440
1441                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1442                             (EC_GROUP_get_degree(group) > 163))
1443                                 {
1444                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1445                                 goto err;
1446                                 }
1447
1448                         /* XXX: For now, we only support ephemeral ECDH
1449                          * keys over named (not generic) curves. For
1450                          * supported named curves, curve_id is non-zero.
1451                          */
1452                         if ((curve_id =
1453                             nid2curve_id(EC_GROUP_get_curve_name(group)))
1454                             == 0)
1455                                 {
1456                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1457                                 goto err;
1458                                 }
1459
1460                         /* Encode the public key.
1461                          * First check the size of encoding and
1462                          * allocate memory accordingly.
1463                          */
1464                         encodedlen = EC_POINT_point2oct(group,
1465                             EC_KEY_get0_public_key(ecdh),
1466                             POINT_CONVERSION_UNCOMPRESSED,
1467                             NULL, 0, NULL);
1468
1469                         encodedPoint = (unsigned char *)
1470                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1471                         bn_ctx = BN_CTX_new();
1472                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1473                                 {
1474                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1475                                 goto err;
1476                                 }
1477
1478
1479                         encodedlen = EC_POINT_point2oct(group,
1480                             EC_KEY_get0_public_key(ecdh),
1481                             POINT_CONVERSION_UNCOMPRESSED,
1482                             encodedPoint, encodedlen, bn_ctx);
1483
1484                         if (encodedlen == 0)
1485                                 {
1486                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1487                                 goto err;
1488                                 }
1489
1490                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1491
1492                         /* XXX: For now, we only support named (not
1493                          * generic) curves in ECDH ephemeral key exchanges.
1494                          * In this situation, we need four additional bytes
1495                          * to encode the entire ServerECDHParams
1496                          * structure.
1497                          */
1498                         n = 4 + encodedlen;
1499
1500                         /* We'll generate the serverKeyExchange message
1501                          * explicitly so we can set these to NULLs
1502                          */
1503                         r[0]=NULL;
1504                         r[1]=NULL;
1505                         r[2]=NULL;
1506                         r[3]=NULL;
1507                         }
1508                 else
1509 #endif /* !OPENSSL_NO_ECDH */
1510                         {
1511                         al=SSL_AD_HANDSHAKE_FAILURE;
1512                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1513                         goto f_err;
1514                         }
1515                 for (i=0; r[i] != NULL; i++)
1516                         {
1517                         nr[i]=BN_num_bytes(r[i]);
1518                         n+=2+nr[i];
1519                         }
1520
1521                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1522                         {
1523                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1524                                 == NULL)
1525                                 {
1526                                 al=SSL_AD_DECODE_ERROR;
1527                                 goto f_err;
1528                                 }
1529                         kn=EVP_PKEY_size(pkey);
1530                         }
1531                 else
1532                         {
1533                         pkey=NULL;
1534                         kn=0;
1535                         }
1536
1537                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1538                         {
1539                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1540                         goto err;
1541                         }
1542                 d=(unsigned char *)s->init_buf->data;
1543                 p= &(d[4]);
1544
1545                 for (i=0; r[i] != NULL; i++)
1546                         {
1547                         s2n(nr[i],p);
1548                         BN_bn2bin(r[i],p);
1549                         p+=nr[i];
1550                         }
1551
1552 #ifndef OPENSSL_NO_ECDH
1553                 if (type & SSL_kECDHE)
1554                         {
1555                         /* XXX: For now, we only support named (not generic) curves.
1556                          * In this situation, the serverKeyExchange message has:
1557                          * [1 byte CurveType], [2 byte CurveName]
1558                          * [1 byte length of encoded point], followed by
1559                          * the actual encoded point itself
1560                          */
1561                         *p = NAMED_CURVE_TYPE;
1562                         p += 1;
1563                         *p = 0;
1564                         p += 1;
1565                         *p = curve_id;
1566                         p += 1;
1567                         *p = encodedlen;
1568                         p += 1;
1569                         memcpy((unsigned char*)p,
1570                             (unsigned char *)encodedPoint,
1571                             encodedlen);
1572                         OPENSSL_free(encodedPoint);
1573                         p += encodedlen;
1574                         }
1575 #endif
1576
1577                 /* not anonymous */
1578                 if (pkey != NULL)
1579                         {
1580                         /* n is the length of the params, they start at &(d[4])
1581                          * and p points to the space at the end. */
1582 #ifndef OPENSSL_NO_RSA
1583                         if (pkey->type == EVP_PKEY_RSA)
1584                                 {
1585                                 q=md_buf;
1586                                 j=0;
1587                                 for (num=2; num > 0; num--)
1588                                         {
1589                                         EVP_MD_CTX_set_flags(&md_ctx,
1590                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1591                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1592                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1593                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1594                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1595                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1596                                         EVP_DigestFinal_ex(&md_ctx,q,
1597                                                 (unsigned int *)&i);
1598                                         q+=i;
1599                                         j+=i;
1600                                         }
1601                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1602                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1603                                         {
1604                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1605                                         goto err;
1606                                         }
1607                                 s2n(u,p);
1608                                 n+=u+2;
1609                                 }
1610                         else
1611 #endif
1612 #if !defined(OPENSSL_NO_DSA)
1613                                 if (pkey->type == EVP_PKEY_DSA)
1614                                 {
1615                                 /* lets do DSS */
1616                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1617                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1618                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1619                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1620                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1621                                         (unsigned int *)&i,pkey))
1622                                         {
1623                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1624                                         goto err;
1625                                         }
1626                                 s2n(i,p);
1627                                 n+=i+2;
1628                                 }
1629                         else
1630 #endif
1631 #if !defined(OPENSSL_NO_ECDSA)
1632                                 if (pkey->type == EVP_PKEY_EC)
1633                                 {
1634                                 /* let's do ECDSA */
1635                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1636                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1637                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1638                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1639                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1640                                         (unsigned int *)&i,pkey))
1641                                         {
1642                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1643                                         goto err;
1644                                         }
1645                                 s2n(i,p);
1646                                 n+=i+2;
1647                                 }
1648                         else
1649 #endif
1650                                 {
1651                                 /* Is this error check actually needed? */
1652                                 al=SSL_AD_HANDSHAKE_FAILURE;
1653                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1654                                 goto f_err;
1655                                 }
1656                         }
1657
1658                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1659                 l2n3(n,d);
1660
1661                 /* we should now have things packed up, so lets send
1662                  * it off */
1663                 s->init_num=n+4;
1664                 s->init_off=0;
1665                 }
1666
1667         s->state = SSL3_ST_SW_KEY_EXCH_B;
1668         EVP_MD_CTX_cleanup(&md_ctx);
1669         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1670 f_err:
1671         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1672 err:
1673 #ifndef OPENSSL_NO_ECDH
1674         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1675         BN_CTX_free(bn_ctx);
1676 #endif
1677         EVP_MD_CTX_cleanup(&md_ctx);
1678         return(-1);
1679         }
1680
1681 int ssl3_send_certificate_request(SSL *s)
1682         {
1683         unsigned char *p,*d;
1684         int i,j,nl,off,n;
1685         STACK_OF(X509_NAME) *sk=NULL;
1686         X509_NAME *name;
1687         BUF_MEM *buf;
1688
1689         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1690                 {
1691                 buf=s->init_buf;
1692
1693                 d=p=(unsigned char *)&(buf->data[4]);
1694
1695                 /* get the list of acceptable cert types */
1696                 p++;
1697                 n=ssl3_get_req_cert_type(s,p);
1698                 d[0]=n;
1699                 p+=n;
1700                 n++;
1701
1702                 off=n;
1703                 p+=2;
1704                 n+=2;
1705
1706                 sk=SSL_get_client_CA_list(s);
1707                 nl=0;
1708                 if (sk != NULL)
1709                         {
1710                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1711                                 {
1712                                 name=sk_X509_NAME_value(sk,i);
1713                                 j=i2d_X509_NAME(name,NULL);
1714                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1715                                         {
1716                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1717                                         goto err;
1718                                         }
1719                                 p=(unsigned char *)&(buf->data[4+n]);
1720                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1721                                         {
1722                                         s2n(j,p);
1723                                         i2d_X509_NAME(name,&p);
1724                                         n+=2+j;
1725                                         nl+=2+j;
1726                                         }
1727                                 else
1728                                         {
1729                                         d=p;
1730                                         i2d_X509_NAME(name,&p);
1731                                         j-=2; s2n(j,d); j+=2;
1732                                         n+=j;
1733                                         nl+=j;
1734                                         }
1735                                 }
1736                         }
1737                 /* else no CA names */
1738                 p=(unsigned char *)&(buf->data[4+off]);
1739                 s2n(nl,p);
1740
1741                 d=(unsigned char *)buf->data;
1742                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1743                 l2n3(n,d);
1744
1745                 /* we should now have things packed up, so lets send
1746                  * it off */
1747
1748                 s->init_num=n+4;
1749                 s->init_off=0;
1750 #ifdef NETSCAPE_HANG_BUG
1751                 p=(unsigned char *)s->init_buf->data + s->init_num;
1752
1753                 /* do the header */
1754                 *(p++)=SSL3_MT_SERVER_DONE;
1755                 *(p++)=0;
1756                 *(p++)=0;
1757                 *(p++)=0;
1758                 s->init_num += 4;
1759 #endif
1760
1761                 s->state = SSL3_ST_SW_CERT_REQ_B;
1762                 }
1763
1764         /* SSL3_ST_SW_CERT_REQ_B */
1765         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1766 err:
1767         return(-1);
1768         }
1769
1770 int ssl3_get_client_key_exchange(SSL *s)
1771         {
1772         int i,al,ok;
1773         long n;
1774         unsigned long l;
1775         unsigned char *p;
1776 #ifndef OPENSSL_NO_RSA
1777         RSA *rsa=NULL;
1778         EVP_PKEY *pkey=NULL;
1779 #endif
1780 #ifndef OPENSSL_NO_DH
1781         BIGNUM *pub=NULL;
1782         DH *dh_srvr;
1783 #endif
1784 #ifndef OPENSSL_NO_KRB5
1785         KSSL_ERR kssl_err;
1786 #endif /* OPENSSL_NO_KRB5 */
1787
1788 #ifndef OPENSSL_NO_ECDH
1789         EC_KEY *srvr_ecdh = NULL;
1790         EVP_PKEY *clnt_pub_pkey = NULL;
1791         EC_POINT *clnt_ecpoint = NULL;
1792         BN_CTX *bn_ctx = NULL;
1793 #endif
1794
1795         n=s->method->ssl_get_message(s,
1796                 SSL3_ST_SR_KEY_EXCH_A,
1797                 SSL3_ST_SR_KEY_EXCH_B,
1798                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1799                 2048, /* ??? */
1800                 &ok);
1801
1802         if (!ok) return((int)n);
1803         p=(unsigned char *)s->init_msg;
1804
1805         l=s->s3->tmp.new_cipher->algorithms;
1806
1807 #ifndef OPENSSL_NO_RSA
1808         if (l & SSL_kRSA)
1809                 {
1810                 /* FIX THIS UP EAY EAY EAY EAY */
1811                 if (s->s3->tmp.use_rsa_tmp)
1812                         {
1813                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1814                                 rsa=s->cert->rsa_tmp;
1815                         /* Don't do a callback because rsa_tmp should
1816                          * be sent already */
1817                         if (rsa == NULL)
1818                                 {
1819                                 al=SSL_AD_HANDSHAKE_FAILURE;
1820                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1821                                 goto f_err;
1822
1823                                 }
1824                         }
1825                 else
1826                         {
1827                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1828                         if (    (pkey == NULL) ||
1829                                 (pkey->type != EVP_PKEY_RSA) ||
1830                                 (pkey->pkey.rsa == NULL))
1831                                 {
1832                                 al=SSL_AD_HANDSHAKE_FAILURE;
1833                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1834                                 goto f_err;
1835                                 }
1836                         rsa=pkey->pkey.rsa;
1837                         }
1838
1839                 /* TLS and [incidentally] DTLS, including pre-0.9.8f */
1840                 if (s->version > SSL3_VERSION &&
1841                     s->client_version != DTLS1_BAD_VER)
1842                         {
1843                         n2s(p,i);
1844                         if (n != i+2)
1845                                 {
1846                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1847                                         {
1848                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1849                                         goto err;
1850                                         }
1851                                 else
1852                                         p-=2;
1853                                 }
1854                         else
1855                                 n=i;
1856                         }
1857
1858                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1859
1860                 al = -1;
1861
1862                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1863                         {
1864                         al=SSL_AD_DECODE_ERROR;
1865                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
1866                         }
1867
1868                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1869                         {
1870                         /* The premaster secret must contain the same version number as the
1871                          * ClientHello to detect version rollback attacks (strangely, the
1872                          * protocol does not offer such protection for DH ciphersuites).
1873                          * However, buggy clients exist that send the negotiated protocol
1874                          * version instead if the server does not support the requested
1875                          * protocol version.
1876                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1877                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1878                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1879                                 {
1880                                 al=SSL_AD_DECODE_ERROR;
1881                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1882
1883                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1884                                  * (http://eprint.iacr.org/2003/052/) exploits the version
1885                                  * number check as a "bad version oracle" -- an alert would
1886                                  * reveal that the plaintext corresponding to some ciphertext
1887                                  * made up by the adversary is properly formatted except
1888                                  * that the version number is wrong.  To avoid such attacks,
1889                                  * we should treat this just like any other decryption error. */
1890                                 }
1891                         }
1892
1893                 if (al != -1)
1894                         {
1895                         /* Some decryption failure -- use random value instead as countermeasure
1896                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1897                          * (see RFC 2246, section 7.4.7.1). */
1898                         ERR_clear_error();
1899                         i = SSL_MAX_MASTER_KEY_LENGTH;
1900                         p[0] = s->client_version >> 8;
1901                         p[1] = s->client_version & 0xff;
1902                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
1903                                 goto err;
1904                         }
1905
1906                 s->session->master_key_length=
1907                         s->method->ssl3_enc->generate_master_secret(s,
1908                                 s->session->master_key,
1909                                 p,i);
1910                 OPENSSL_cleanse(p,i);
1911                 }
1912         else
1913 #endif
1914 #ifndef OPENSSL_NO_DH
1915                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1916                 {
1917                 n2s(p,i);
1918                 if (n != i+2)
1919                         {
1920                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1921                                 {
1922                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1923                                 goto err;
1924                                 }
1925                         else
1926                                 {
1927                                 p-=2;
1928                                 i=(int)n;
1929                                 }
1930                         }
1931
1932                 if (n == 0L) /* the parameters are in the cert */
1933                         {
1934                         al=SSL_AD_HANDSHAKE_FAILURE;
1935                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1936                         goto f_err;
1937                         }
1938                 else
1939                         {
1940                         if (s->s3->tmp.dh == NULL)
1941                                 {
1942                                 al=SSL_AD_HANDSHAKE_FAILURE;
1943                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1944                                 goto f_err;
1945                                 }
1946                         else
1947                                 dh_srvr=s->s3->tmp.dh;
1948                         }
1949
1950                 pub=BN_bin2bn(p,i,NULL);
1951                 if (pub == NULL)
1952                         {
1953                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1954                         goto err;
1955                         }
1956
1957                 i=DH_compute_key(p,pub,dh_srvr);
1958
1959                 if (i <= 0)
1960                         {
1961                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1962                         goto err;
1963                         }
1964
1965                 DH_free(s->s3->tmp.dh);
1966                 s->s3->tmp.dh=NULL;
1967
1968                 BN_clear_free(pub);
1969                 pub=NULL;
1970                 s->session->master_key_length=
1971                         s->method->ssl3_enc->generate_master_secret(s,
1972                                 s->session->master_key,p,i);
1973                 OPENSSL_cleanse(p,i);
1974                 }
1975         else
1976 #endif
1977 #ifndef OPENSSL_NO_KRB5
1978         if (l & SSL_kKRB5)
1979                 {
1980                 krb5_error_code         krb5rc;
1981                 krb5_data               enc_ticket;
1982                 krb5_data               authenticator;
1983                 krb5_data               enc_pms;
1984                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
1985                 EVP_CIPHER_CTX          ciph_ctx;
1986                 EVP_CIPHER              *enc = NULL;
1987                 unsigned char           iv[EVP_MAX_IV_LENGTH];
1988                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
1989                                                + EVP_MAX_BLOCK_LENGTH];
1990                 int                     padl, outl;
1991                 krb5_timestamp          authtime = 0;
1992                 krb5_ticket_times       ttimes;
1993
1994                 EVP_CIPHER_CTX_init(&ciph_ctx);
1995
1996                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
1997
1998                 n2s(p,i);
1999                 enc_ticket.length = i;
2000
2001                 if (n < (int)enc_ticket.length + 6)
2002                         {
2003                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2004                                 SSL_R_DATA_LENGTH_TOO_LONG);
2005                         goto err;
2006                         }
2007
2008                 enc_ticket.data = (char *)p;
2009                 p+=enc_ticket.length;
2010
2011                 n2s(p,i);
2012                 authenticator.length = i;
2013
2014                 if (n < (int)(enc_ticket.length + authenticator.length) + 6)
2015                         {
2016                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2017                                 SSL_R_DATA_LENGTH_TOO_LONG);
2018                         goto err;
2019                         }
2020
2021                 authenticator.data = (char *)p;
2022                 p+=authenticator.length;
2023
2024                 n2s(p,i);
2025                 enc_pms.length = i;
2026                 enc_pms.data = (char *)p;
2027                 p+=enc_pms.length;
2028
2029                 /* Note that the length is checked again below,
2030                 ** after decryption
2031                 */
2032                 if(enc_pms.length > sizeof pms)
2033                         {
2034                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2035                                SSL_R_DATA_LENGTH_TOO_LONG);
2036                         goto err;
2037                         }
2038
2039                 if (n != (long)(enc_ticket.length + authenticator.length +
2040                                                 enc_pms.length + 6))
2041                         {
2042                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2043                                 SSL_R_DATA_LENGTH_TOO_LONG);
2044                         goto err;
2045                         }
2046
2047                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2048                                         &kssl_err)) != 0)
2049                         {
2050 #ifdef KSSL_DEBUG
2051                         printf("kssl_sget_tkt rtn %d [%d]\n",
2052                                 krb5rc, kssl_err.reason);
2053                         if (kssl_err.text)
2054                                 printf("kssl_err text= %s\n", kssl_err.text);
2055 #endif  /* KSSL_DEBUG */
2056                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2057                                 kssl_err.reason);
2058                         goto err;
2059                         }
2060
2061                 /*  Note: no authenticator is not considered an error,
2062                 **  but will return authtime == 0.
2063                 */
2064                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2065                                         &authtime, &kssl_err)) != 0)
2066                         {
2067 #ifdef KSSL_DEBUG
2068                         printf("kssl_check_authent rtn %d [%d]\n",
2069                                 krb5rc, kssl_err.reason);
2070                         if (kssl_err.text)
2071                                 printf("kssl_err text= %s\n", kssl_err.text);
2072 #endif  /* KSSL_DEBUG */
2073                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2074                                 kssl_err.reason);
2075                         goto err;
2076                         }
2077
2078                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2079                         {
2080                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2081                         goto err;
2082                         }
2083
2084 #ifdef KSSL_DEBUG
2085                 kssl_ctx_show(kssl_ctx);
2086 #endif  /* KSSL_DEBUG */
2087
2088                 enc = kssl_map_enc(kssl_ctx->enctype);
2089                 if (enc == NULL)
2090                     goto err;
2091
2092                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2093
2094                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2095                         {
2096                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2097                                 SSL_R_DECRYPTION_FAILED);
2098                         goto err;
2099                         }
2100                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2101                                         (unsigned char *)enc_pms.data, enc_pms.length))
2102                         {
2103                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2104                                 SSL_R_DECRYPTION_FAILED);
2105                         goto err;
2106                         }
2107                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2108                         {
2109                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2110                                 SSL_R_DATA_LENGTH_TOO_LONG);
2111                         goto err;
2112                         }
2113                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2114                         {
2115                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2116                                 SSL_R_DECRYPTION_FAILED);
2117                         goto err;
2118                         }
2119                 outl += padl;
2120                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2121                         {
2122                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2123                                 SSL_R_DATA_LENGTH_TOO_LONG);
2124                         goto err;
2125                         }
2126                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2127                     {
2128                     /* The premaster secret must contain the same version number as the
2129                      * ClientHello to detect version rollback attacks (strangely, the
2130                      * protocol does not offer such protection for DH ciphersuites).
2131                      * However, buggy clients exist that send random bytes instead of
2132                      * the protocol version.
2133                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2134                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2135                      */
2136                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2137                         {
2138                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2139                                SSL_AD_DECODE_ERROR);
2140                         goto err;
2141                         }
2142                     }
2143
2144                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2145
2146                 s->session->master_key_length=
2147                         s->method->ssl3_enc->generate_master_secret(s,
2148                                 s->session->master_key, pms, outl);
2149
2150                 if (kssl_ctx->client_princ)
2151                         {
2152                         size_t len = strlen(kssl_ctx->client_princ);
2153                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2154                                 {
2155                                 s->session->krb5_client_princ_len = len;
2156                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2157                                 }
2158                         }
2159
2160
2161                 /*  Was doing kssl_ctx_free() here,
2162                 **  but it caused problems for apache.
2163                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2164                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2165                 */
2166                 }
2167         else
2168 #endif  /* OPENSSL_NO_KRB5 */
2169
2170 #ifndef OPENSSL_NO_ECDH
2171                 if ((l & SSL_kECDH) || (l & SSL_kECDHE))
2172                 {
2173                 int ret = 1;
2174                 int field_size = 0;
2175                 const EC_KEY   *tkey;
2176                 const EC_GROUP *group;
2177                 const BIGNUM *priv_key;
2178
2179                 /* initialize structures for server's ECDH key pair */
2180                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2181                         {
2182                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2183                             ERR_R_MALLOC_FAILURE);
2184                         goto err;
2185                         }
2186
2187                 /* Let's get server private key and group information */
2188                 if (l & SSL_kECDH)
2189                         {
2190                         /* use the certificate */
2191                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2192                         }
2193                 else
2194                         {
2195                         /* use the ephermeral values we saved when
2196                          * generating the ServerKeyExchange msg.
2197                          */
2198                         tkey = s->s3->tmp.ecdh;
2199                         }
2200
2201                 group    = EC_KEY_get0_group(tkey);
2202                 priv_key = EC_KEY_get0_private_key(tkey);
2203
2204                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2205                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2206                         {
2207                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2208                                ERR_R_EC_LIB);
2209                         goto err;
2210                         }
2211
2212                 /* Let's get client's public key */
2213                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2214                         {
2215                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2216                             ERR_R_MALLOC_FAILURE);
2217                         goto err;
2218                         }
2219
2220                 if (n == 0L)
2221                         {
2222                         /* Client Publickey was in Client Certificate */
2223
2224                          if (l & SSL_kECDHE)
2225                                  {
2226                                  al=SSL_AD_HANDSHAKE_FAILURE;
2227                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2228                                  goto f_err;
2229                                  }
2230                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2231                             == NULL) ||
2232                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2233                                 {
2234                                 /* XXX: For now, we do not support client
2235                                  * authentication using ECDH certificates
2236                                  * so this branch (n == 0L) of the code is
2237                                  * never executed. When that support is
2238                                  * added, we ought to ensure the key
2239                                  * received in the certificate is
2240                                  * authorized for key agreement.
2241                                  * ECDH_compute_key implicitly checks that
2242                                  * the two ECDH shares are for the same
2243                                  * group.
2244                                  */
2245                                 al=SSL_AD_HANDSHAKE_FAILURE;
2246                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2247                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2248                                 goto f_err;
2249                                 }
2250
2251                         if (EC_POINT_copy(clnt_ecpoint,
2252                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2253                                 {
2254                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2255                                         ERR_R_EC_LIB);
2256                                 goto err;
2257                                 }
2258                         ret = 2; /* Skip certificate verify processing */
2259                         }
2260                 else
2261                         {
2262                         /* Get client's public key from encoded point
2263                          * in the ClientKeyExchange message.
2264                          */
2265                         if ((bn_ctx = BN_CTX_new()) == NULL)
2266                                 {
2267                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2268                                     ERR_R_MALLOC_FAILURE);
2269                                 goto err;
2270                                 }
2271
2272                         /* Get encoded point length */
2273                         i = *p;
2274                         p += 1;
2275                         if (EC_POINT_oct2point(group,
2276                             clnt_ecpoint, p, i, bn_ctx) == 0)
2277                                 {
2278                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2279                                     ERR_R_EC_LIB);
2280                                 goto err;
2281                                 }
2282                         /* p is pointing to somewhere in the buffer
2283                          * currently, so set it to the start
2284                          */
2285                         p=(unsigned char *)s->init_buf->data;
2286                         }
2287
2288                 /* Compute the shared pre-master secret */
2289                 field_size = EC_GROUP_get_degree(group);
2290                 if (field_size <= 0)
2291                         {
2292                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2293                                ERR_R_ECDH_LIB);
2294                         goto err;
2295                         }
2296                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2297                 if (i <= 0)
2298                         {
2299                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2300                             ERR_R_ECDH_LIB);
2301                         goto err;
2302                         }
2303
2304                 EVP_PKEY_free(clnt_pub_pkey);
2305                 EC_POINT_free(clnt_ecpoint);
2306                 if (srvr_ecdh != NULL)
2307                         EC_KEY_free(srvr_ecdh);
2308                 BN_CTX_free(bn_ctx);
2309
2310                 /* Compute the master secret */
2311                 s->session->master_key_length = s->method->ssl3_enc-> \
2312                     generate_master_secret(s, s->session->master_key, p, i);
2313
2314                 OPENSSL_cleanse(p, i);
2315                 return (ret);
2316                 }
2317         else
2318 #endif
2319                 {
2320                 al=SSL_AD_HANDSHAKE_FAILURE;
2321                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2322                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2323                 goto f_err;
2324                 }
2325
2326         return(1);
2327 f_err:
2328         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2329 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2330 err:
2331 #endif
2332 #ifndef OPENSSL_NO_ECDH
2333         EVP_PKEY_free(clnt_pub_pkey);
2334         EC_POINT_free(clnt_ecpoint);
2335         if (srvr_ecdh != NULL)
2336                 EC_KEY_free(srvr_ecdh);
2337         BN_CTX_free(bn_ctx);
2338 #endif
2339         return(-1);
2340         }
2341
2342 int ssl3_get_cert_verify(SSL *s)
2343         {
2344         EVP_PKEY *pkey=NULL;
2345         unsigned char *p;
2346         int al,ok,ret=0;
2347         long n;
2348         int type=0,i,j;
2349         X509 *peer;
2350
2351         n=s->method->ssl_get_message(s,
2352                 SSL3_ST_SR_CERT_VRFY_A,
2353                 SSL3_ST_SR_CERT_VRFY_B,
2354                 -1,
2355                 514, /* 514? */
2356                 &ok);
2357
2358         if (!ok) return((int)n);
2359
2360         if (s->session->peer != NULL)
2361                 {
2362                 peer=s->session->peer;
2363                 pkey=X509_get_pubkey(peer);
2364                 type=X509_certificate_type(peer,pkey);
2365                 }
2366         else
2367                 {
2368                 peer=NULL;
2369                 pkey=NULL;
2370                 }
2371
2372         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2373                 {
2374                 s->s3->tmp.reuse_message=1;
2375                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2376                         {
2377                         al=SSL_AD_UNEXPECTED_MESSAGE;
2378                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2379                         goto f_err;
2380                         }
2381                 ret=1;
2382                 goto end;
2383                 }
2384
2385         if (peer == NULL)
2386                 {
2387                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2388                 al=SSL_AD_UNEXPECTED_MESSAGE;
2389                 goto f_err;
2390                 }
2391
2392         if (!(type & EVP_PKT_SIGN))
2393                 {
2394                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2395                 al=SSL_AD_ILLEGAL_PARAMETER;
2396                 goto f_err;
2397                 }
2398
2399         if (s->s3->change_cipher_spec)
2400                 {
2401                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2402                 al=SSL_AD_UNEXPECTED_MESSAGE;
2403                 goto f_err;
2404                 }
2405
2406         /* we now have a signature that we need to verify */
2407         p=(unsigned char *)s->init_msg;
2408         n2s(p,i);
2409         n-=2;
2410         if (i > n)
2411                 {
2412                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2413                 al=SSL_AD_DECODE_ERROR;
2414                 goto f_err;
2415                 }
2416
2417         j=EVP_PKEY_size(pkey);
2418         if ((i > j) || (n > j) || (n <= 0))
2419                 {
2420                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2421                 al=SSL_AD_DECODE_ERROR;
2422                 goto f_err;
2423                 }
2424
2425 #ifndef OPENSSL_NO_RSA
2426         if (pkey->type == EVP_PKEY_RSA)
2427                 {
2428                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2429                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
2430                                                         pkey->pkey.rsa);
2431                 if (i < 0)
2432                         {
2433                         al=SSL_AD_DECRYPT_ERROR;
2434                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2435                         goto f_err;
2436                         }
2437                 if (i == 0)
2438                         {
2439                         al=SSL_AD_DECRYPT_ERROR;
2440                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2441                         goto f_err;
2442                         }
2443                 }
2444         else
2445 #endif
2446 #ifndef OPENSSL_NO_DSA
2447                 if (pkey->type == EVP_PKEY_DSA)
2448                 {
2449                 j=DSA_verify(pkey->save_type,
2450                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2451                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2452                 if (j <= 0)
2453                         {
2454                         /* bad signature */
2455                         al=SSL_AD_DECRYPT_ERROR;
2456                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2457                         goto f_err;
2458                         }
2459                 }
2460         else
2461 #endif
2462 #ifndef OPENSSL_NO_ECDSA
2463                 if (pkey->type == EVP_PKEY_EC)
2464                 {
2465                 j=ECDSA_verify(pkey->save_type,
2466                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2467                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2468                 if (j <= 0)
2469                         {
2470                         /* bad signature */
2471                         al=SSL_AD_DECRYPT_ERROR;
2472                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2473                             SSL_R_BAD_ECDSA_SIGNATURE);
2474                         goto f_err;
2475                         }
2476                 }
2477         else
2478 #endif
2479                 {
2480                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2481                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2482                 goto f_err;
2483                 }
2484
2485
2486         ret=1;
2487         if (0)
2488                 {
2489 f_err:
2490                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2491                 }
2492 end:
2493         EVP_PKEY_free(pkey);
2494         return(ret);
2495         }
2496
2497 int ssl3_get_client_certificate(SSL *s)
2498         {
2499         int i,ok,al,ret= -1;
2500         X509 *x=NULL;
2501         unsigned long l,nc,llen,n;
2502         const unsigned char *p,*q;
2503         unsigned char *d;
2504         STACK_OF(X509) *sk=NULL;
2505
2506         n=s->method->ssl_get_message(s,
2507                 SSL3_ST_SR_CERT_A,
2508                 SSL3_ST_SR_CERT_B,
2509                 -1,
2510                 s->max_cert_list,
2511                 &ok);
2512
2513         if (!ok) return((int)n);
2514
2515         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2516                 {
2517                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2518                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2519                         {
2520                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2521                         al=SSL_AD_HANDSHAKE_FAILURE;
2522                         goto f_err;
2523                         }
2524                 /* If tls asked for a client cert, the client must return a 0 list */
2525                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2526                         {
2527                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2528                         al=SSL_AD_UNEXPECTED_MESSAGE;
2529                         goto f_err;
2530                         }
2531                 s->s3->tmp.reuse_message=1;
2532                 return(1);
2533                 }
2534
2535         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2536                 {
2537                 al=SSL_AD_UNEXPECTED_MESSAGE;
2538                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2539                 goto f_err;
2540                 }
2541         p=d=(unsigned char *)s->init_msg;
2542
2543         if ((sk=sk_X509_new_null()) == NULL)
2544                 {
2545                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2546                 goto err;
2547                 }
2548
2549         n2l3(p,llen);
2550         if (llen+3 != n)
2551                 {
2552                 al=SSL_AD_DECODE_ERROR;
2553                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2554                 goto f_err;
2555                 }
2556         for (nc=0; nc<llen; )
2557                 {
2558                 n2l3(p,l);
2559                 if ((l+nc+3) > llen)
2560                         {
2561                         al=SSL_AD_DECODE_ERROR;
2562                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2563                         goto f_err;
2564                         }
2565
2566                 q=p;
2567                 x=d2i_X509(NULL,&p,l);
2568                 if (x == NULL)
2569                         {
2570                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2571                         goto err;
2572                         }
2573                 if (p != (q+l))
2574                         {
2575                         al=SSL_AD_DECODE_ERROR;
2576                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2577                         goto f_err;
2578                         }
2579                 if (!sk_X509_push(sk,x))
2580                         {
2581                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2582                         goto err;
2583                         }
2584                 x=NULL;
2585                 nc+=l+3;
2586                 }
2587
2588         if (sk_X509_num(sk) <= 0)
2589                 {
2590                 /* TLS does not mind 0 certs returned */
2591                 if (s->version == SSL3_VERSION)
2592                         {
2593                         al=SSL_AD_HANDSHAKE_FAILURE;
2594                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2595                         goto f_err;
2596                         }
2597                 /* Fail for TLS only if we required a certificate */
2598                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2599                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2600                         {
2601                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2602                         al=SSL_AD_HANDSHAKE_FAILURE;
2603                         goto f_err;
2604                         }
2605                 }
2606         else
2607                 {
2608                 i=ssl_verify_cert_chain(s,sk);
2609                 if (i <= 0)
2610                         {
2611                         al=ssl_verify_alarm_type(s->verify_result);
2612                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2613                         goto f_err;
2614                         }
2615                 }
2616
2617         if (s->session->peer != NULL) /* This should not be needed */
2618                 X509_free(s->session->peer);
2619         s->session->peer=sk_X509_shift(sk);
2620         s->session->verify_result = s->verify_result;
2621
2622         /* With the current implementation, sess_cert will always be NULL
2623          * when we arrive here. */
2624         if (s->session->sess_cert == NULL)
2625                 {
2626                 s->session->sess_cert = ssl_sess_cert_new();
2627                 if (s->session->sess_cert == NULL)
2628                         {
2629                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2630                         goto err;
2631                         }
2632                 }
2633         if (s->session->sess_cert->cert_chain != NULL)
2634                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2635         s->session->sess_cert->cert_chain=sk;
2636         /* Inconsistency alert: cert_chain does *not* include the
2637          * peer's own certificate, while we do include it in s3_clnt.c */
2638
2639         sk=NULL;
2640
2641         ret=1;
2642         if (0)
2643                 {
2644 f_err:
2645                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2646                 }
2647 err:
2648         if (x != NULL) X509_free(x);
2649         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2650         return(ret);
2651         }
2652
2653 int ssl3_send_server_certificate(SSL *s)
2654         {
2655         unsigned long l;
2656         X509 *x;
2657
2658         if (s->state == SSL3_ST_SW_CERT_A)
2659                 {
2660                 x=ssl_get_server_send_cert(s);
2661                 if (x == NULL &&
2662                         /* VRS: allow null cert if auth == KRB5 */
2663                         (s->s3->tmp.new_cipher->algorithms
2664                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
2665                         != (SSL_aKRB5|SSL_kKRB5))
2666                         {
2667                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2668                         return(0);
2669                         }
2670
2671                 l=ssl3_output_cert_chain(s,x);
2672                 s->state=SSL3_ST_SW_CERT_B;
2673                 s->init_num=(int)l;
2674                 s->init_off=0;
2675                 }
2676
2677         /* SSL3_ST_SW_CERT_B */
2678         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2679         }
2680
2681
2682 #ifndef OPENSSL_NO_ECDH
2683 /* This is the complement of curve_id2nid in s3_clnt.c. */
2684 static int nid2curve_id(int nid)
2685 {
2686         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2687          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2688         switch (nid) {
2689         case NID_sect163k1: /* sect163k1 (1) */
2690                 return 1;
2691         case NID_sect163r1: /* sect163r1 (2) */
2692                 return 2;
2693         case NID_sect163r2: /* sect163r2 (3) */
2694                 return 3;
2695         case NID_sect193r1: /* sect193r1 (4) */
2696                 return 4;
2697         case NID_sect193r2: /* sect193r2 (5) */
2698                 return 5;
2699         case NID_sect233k1: /* sect233k1 (6) */
2700                 return 6;
2701         case NID_sect233r1: /* sect233r1 (7) */
2702                 return 7;
2703         case NID_sect239k1: /* sect239k1 (8) */
2704                 return 8;
2705         case NID_sect283k1: /* sect283k1 (9) */
2706                 return 9;
2707         case NID_sect283r1: /* sect283r1 (10) */
2708                 return 10;
2709         case NID_sect409k1: /* sect409k1 (11) */
2710                 return 11;
2711         case NID_sect409r1: /* sect409r1 (12) */
2712                 return 12;
2713         case NID_sect571k1: /* sect571k1 (13) */
2714                 return 13;
2715         case NID_sect571r1: /* sect571r1 (14) */
2716                 return 14;
2717         case NID_secp160k1: /* secp160k1 (15) */
2718                 return 15;
2719         case NID_secp160r1: /* secp160r1 (16) */
2720                 return 16;
2721         case NID_secp160r2: /* secp160r2 (17) */
2722                 return 17;
2723         case NID_secp192k1: /* secp192k1 (18) */
2724                 return 18;
2725         case NID_X9_62_prime192v1: /* secp192r1 (19) */
2726                 return 19;
2727         case NID_secp224k1: /* secp224k1 (20) */
2728                 return 20;
2729         case NID_secp224r1: /* secp224r1 (21) */
2730                 return 21;
2731         case NID_secp256k1: /* secp256k1 (22) */
2732                 return 22;
2733         case NID_X9_62_prime256v1: /* secp256r1 (23) */
2734                 return 23;
2735         case NID_secp384r1: /* secp384r1 (24) */
2736                 return 24;
2737         case NID_secp521r1:  /* secp521r1 (25) */
2738                 return 25;
2739         default:
2740                 return 0;
2741         }
2742 }
2743 #endif
2744 #ifndef OPENSSL_NO_TLSEXT
2745 int ssl3_send_newsession_ticket(SSL *s)
2746         {
2747         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
2748                 {
2749                 unsigned char *p, *senc, *macstart;
2750                 int len, slen;
2751                 unsigned int hlen;
2752                 EVP_CIPHER_CTX ctx;
2753                 HMAC_CTX hctx;
2754                 SSL_CTX *tctx = s->initial_ctx;
2755                 unsigned char iv[EVP_MAX_IV_LENGTH];
2756                 unsigned char key_name[16];
2757
2758                 /* get session encoding length */
2759                 slen = i2d_SSL_SESSION(s->session, NULL);
2760                 /* Some length values are 16 bits, so forget it if session is
2761                  * too long
2762                  */
2763                 if (slen > 0xFF00)
2764                         return -1;
2765                 /* Grow buffer if need be: the length calculation is as
2766                  * follows 1 (size of message name) + 3 (message length
2767                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
2768                  * 16 (key name) + max_iv_len (iv length) +
2769                  * session_length + max_enc_block_size (max encrypted session
2770                  * length) + max_md_size (HMAC).
2771                  */
2772                 if (!BUF_MEM_grow(s->init_buf,
2773                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
2774                         EVP_MAX_MD_SIZE + slen))
2775                         return -1;
2776                 senc = OPENSSL_malloc(slen);
2777                 if (!senc)
2778                         return -1;
2779                 p = senc;
2780                 i2d_SSL_SESSION(s->session, &p);
2781
2782                 p=(unsigned char *)s->init_buf->data;
2783                 /* do the header */
2784                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
2785                 /* Skip message length for now */
2786                 p += 3;
2787                 EVP_CIPHER_CTX_init(&ctx);
2788                 HMAC_CTX_init(&hctx);
2789                 /* Initialize HMAC and cipher contexts. If callback present
2790                  * it does all the work otherwise use generated values
2791                  * from parent ctx.
2792                  */
2793                 if (tctx->tlsext_ticket_key_cb)
2794                         {
2795                         if (tctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
2796                                                          &hctx, 1) < 0)
2797                                 {
2798                                 OPENSSL_free(senc);
2799                                 return -1;
2800                                 }
2801                         }
2802                 else
2803                         {
2804                         RAND_pseudo_bytes(iv, 16);
2805                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
2806                                         tctx->tlsext_tick_aes_key, iv);
2807                         HMAC_Init_ex(&hctx, tctx->tlsext_tick_hmac_key, 16,
2808                                         tlsext_tick_md(), NULL);
2809                         memcpy(key_name, tctx->tlsext_tick_key_name, 16);
2810                         }
2811                 l2n(s->session->tlsext_tick_lifetime_hint, p);
2812                 /* Skip ticket length for now */
2813                 p += 2;
2814                 /* Output key name */
2815                 macstart = p;
2816                 memcpy(p, key_name, 16);
2817                 p += 16;
2818                 /* output IV */
2819                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
2820                 p += EVP_CIPHER_CTX_iv_length(&ctx);
2821                 /* Encrypt session data */
2822                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
2823                 p += len;
2824                 EVP_EncryptFinal(&ctx, p, &len);
2825                 p += len;
2826                 EVP_CIPHER_CTX_cleanup(&ctx);
2827
2828                 HMAC_Update(&hctx, macstart, p - macstart);
2829                 HMAC_Final(&hctx, p, &hlen);
2830                 HMAC_CTX_cleanup(&hctx);
2831
2832                 p += hlen;
2833                 /* Now write out lengths: p points to end of data written */
2834                 /* Total length */
2835                 len = p - (unsigned char *)s->init_buf->data;
2836                 p=(unsigned char *)s->init_buf->data + 1;
2837                 l2n3(len - 4, p); /* Message length */
2838                 p += 4;
2839                 s2n(len - 10, p);  /* Ticket length */
2840
2841                 /* number of bytes to write */
2842                 s->init_num= len;
2843                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
2844                 s->init_off=0;
2845                 OPENSSL_free(senc);
2846                 }
2847
2848         /* SSL3_ST_SW_SESSION_TICKET_B */
2849         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2850         }
2851
2852 int ssl3_send_cert_status(SSL *s)
2853         {
2854         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
2855                 {
2856                 unsigned char *p;
2857                 /* Grow buffer if need be: the length calculation is as
2858                  * follows 1 (message type) + 3 (message length) +
2859                  * 1 (ocsp response type) + 3 (ocsp response length)
2860                  * + (ocsp response)
2861                  */
2862                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
2863                         return -1;
2864
2865                 p=(unsigned char *)s->init_buf->data;
2866
2867                 /* do the header */
2868                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
2869                 /* message length */
2870                 l2n3(s->tlsext_ocsp_resplen + 4, p);
2871                 /* status type */
2872                 *(p++)= s->tlsext_status_type;
2873                 /* length of OCSP response */
2874                 l2n3(s->tlsext_ocsp_resplen, p);
2875                 /* actual response */
2876                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
2877                 /* number of bytes to write */
2878                 s->init_num = 8 + s->tlsext_ocsp_resplen;
2879                 s->state=SSL3_ST_SW_CERT_STATUS_B;
2880                 s->init_off = 0;
2881                 }
2882
2883         /* SSL3_ST_SW_CERT_STATUS_B */
2884         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2885         }
2886 #endif