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