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         long num1;
 170         int ret= -1;
 171         int new_state,state,skip=0;
 172
 173         RAND_add(&Time,sizeof(Time),0);
 174         ERR_clear_error();
 175         clear_sys_error();
 176
 177         if (s->info_callback != NULL)
 178                 cb=s->info_callback;
 179         else if (s->ctx->info_callback != NULL)
 180                 cb=s->ctx->info_callback;
 181
 182         /* init things to blank */
 183         s->in_handshake++;
 184         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 185
 186         if (s->cert == NULL)
 187                 {
 188                 SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_NO_CERTIFICATE_SET);
 189                 return(-1);
 190                 }
 191
 192         for (;;)
 193                 {
 194                 state=s->state;
 195
 196                 switch (s->state)
 197                         {
 198                 case SSL_ST_RENEGOTIATE:
 199                         s->new_session=1;
 200                         /* s->state=SSL_ST_ACCEPT; */
 201
 202                 case SSL_ST_BEFORE:
 203                 case SSL_ST_ACCEPT:
 204                 case SSL_ST_BEFORE|SSL_ST_ACCEPT:
 205                 case SSL_ST_OK|SSL_ST_ACCEPT:
 206
 207                         s->server=1;
 208                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 209
 210                         if ((s->version>>8) != 3)
 211                                 {
 212                                 SSLerr(SSL_F_SSL3_ACCEPT, ERR_R_INTERNAL_ERROR);
 213                                 return -1;
 214                                 }
 215                         s->type=SSL_ST_ACCEPT;
 216
 217                         if (s->init_buf == NULL)
 218                                 {
 219                                 if ((buf=BUF_MEM_new()) == NULL)
 220                                         {
 221                                         ret= -1;
 222                                         goto end;
 223                                         }
 224                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 225                                         {
 226                                         ret= -1;
 227                                         goto end;
 228                                         }
 229                                 s->init_buf=buf;
 230                                 }
 231
 232                         if (!ssl3_setup_buffers(s))
 233                                 {
 234                                 ret= -1;
 235                                 goto end;
 236                                 }
 237
 238                         s->init_num=0;
 239
 240                         if (s->state != SSL_ST_RENEGOTIATE)
 241                                 {
 242                                 /* Ok, we now need to push on a buffering BIO so that
 243                                  * the output is sent in a way that TCP likes :-)
 244                                  */
 245                                 if (!ssl_init_wbio_buffer(s,1)) { ret= -1; goto end; }
 246
 247                                 ssl3_init_finished_mac(s);
 248                                 s->state=SSL3_ST_SR_CLNT_HELLO_A;
 249                                 s->ctx->stats.sess_accept++;
 250                                 }
 251                         else
 252                                 {
 253                                 /* s->state == SSL_ST_RENEGOTIATE,
 254                                  * we will just send a HelloRequest */
 255                                 s->ctx->stats.sess_accept_renegotiate++;
 256                                 s->state=SSL3_ST_SW_HELLO_REQ_A;
 257                                 }
 258                         break;
 259
 260                 case SSL3_ST_SW_HELLO_REQ_A:
 261                 case SSL3_ST_SW_HELLO_REQ_B:
 262
 263                         s->shutdown=0;
 264                         ret=ssl3_send_hello_request(s);
 265                         if (ret <= 0) goto end;
 266                         s->s3->tmp.next_state=SSL3_ST_SW_HELLO_REQ_C;
 267                         s->state=SSL3_ST_SW_FLUSH;
 268                         s->init_num=0;
 269
 270                         ssl3_init_finished_mac(s);
 271                         break;
 272
 273                 case SSL3_ST_SW_HELLO_REQ_C:
 274                         s->state=SSL_ST_OK;
 275                         break;
 276
 277                 case SSL3_ST_SR_CLNT_HELLO_A:
 278                 case SSL3_ST_SR_CLNT_HELLO_B:
 279                 case SSL3_ST_SR_CLNT_HELLO_C:
 280
 281                         s->shutdown=0;
 282                         ret=ssl3_get_client_hello(s);
 283                         if (ret <= 0) goto end;
 284                         s->new_session = 2;
 285                         s->state=SSL3_ST_SW_SRVR_HELLO_A;
 286                         s->init_num=0;
 287                         break;
 288
 289                 case SSL3_ST_SW_SRVR_HELLO_A:
 290                 case SSL3_ST_SW_SRVR_HELLO_B:
 291                         ret=ssl3_send_server_hello(s);
 292                         if (ret <= 0) goto end;
 293 #ifndef OPENSSL_NO_TLSEXT
 294                         if (s->hit)
 295                                 {
 296                                 if (s->tlsext_ticket_expected)
 297                                         s->state=SSL3_ST_SW_SESSION_TICKET_A;
 298                                 else
 299                                         s->state=SSL3_ST_SW_CHANGE_A;
 300                                 }
 301 #else
 302                         if (s->hit)
 303                                         s->state=SSL3_ST_SW_CHANGE_A;
 304 #endif
 305                         else
 306                                 s->state=SSL3_ST_SW_CERT_A;
 307                         s->init_num=0;
 308                         break;
 309
 310                 case SSL3_ST_SW_CERT_A:
 311                 case SSL3_ST_SW_CERT_B:
 312                         /* Check if it is anon DH or anon ECDH or KRB5 */
 313                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL)
 314                                 && !(s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 315                                 {
 316                                 ret=ssl3_send_server_certificate(s);
 317                                 if (ret <= 0) goto end;
 318 #ifndef OPENSSL_NO_TLSEXT
 319                                 if (s->tlsext_status_expected)
 320                                         s->state=SSL3_ST_SW_CERT_STATUS_A;
 321                                 else
 322                                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 323                                 }
 324                         else
 325                                 {
 326                                 skip = 1;
 327                                 s->state=SSL3_ST_SW_KEY_EXCH_A;
 328                                 }
 329 #else
 330                                 }
 331                         else
 332                                 skip=1;
 333
 334                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 335 #endif
 336                         s->init_num=0;
 337                         break;
 338
 339                 case SSL3_ST_SW_KEY_EXCH_A:
 340                 case SSL3_ST_SW_KEY_EXCH_B:
 341                         l=s->s3->tmp.new_cipher->algorithms;
 342
 343                         /* clear this, it may get reset by
 344                          * send_server_key_exchange */
 345                         if ((s->options & SSL_OP_EPHEMERAL_RSA)
 346 #ifndef OPENSSL_NO_KRB5
 347                                 && !(l & SSL_KRB5)
 348 #endif /* OPENSSL_NO_KRB5 */
 349                                 )
 350                                 /* option SSL_OP_EPHEMERAL_RSA sends temporary RSA key
 351                                  * even when forbidden by protocol specs
 352                                  * (handshake may fail as clients are not required to
 353                                  * be able to handle this) */
 354                                 s->s3->tmp.use_rsa_tmp=1;
 355                         else
 356                                 s->s3->tmp.use_rsa_tmp=0;
 357
 358
 359                         /* only send if a DH key exchange, fortezza or
 360                          * RSA but we have a sign only certificate
 361                          *
 362                          * For ECC ciphersuites, we send a serverKeyExchange
 363                          * message only if the cipher suite is either
 364                          * ECDH-anon or ECDHE. In other cases, the
 365                          * server certificate contains the server's
 366                          * public key for key exchange.
 367                          */
 368                         if (s->s3->tmp.use_rsa_tmp
 369                             || (l & SSL_kECDHE)
 370                             || (l & (SSL_DH|SSL_kFZA))
 371                             || ((l & SSL_kRSA)
 372                                 && (s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey == NULL
 373                                     || (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher)
 374                                         && EVP_PKEY_size(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher)
 375                                         )
 376                                     )
 377                                 )
 378                             )
 379                                 {
 380                                 ret=ssl3_send_server_key_exchange(s);
 381                                 if (ret <= 0) goto end;
 382                                 }
 383                         else
 384                                 skip=1;
 385
 386                         s->state=SSL3_ST_SW_CERT_REQ_A;
 387                         s->init_num=0;
 388                         break;
 389
 390                 case SSL3_ST_SW_CERT_REQ_A:
 391                 case SSL3_ST_SW_CERT_REQ_B:
 392                         if (/* don't request cert unless asked for it: */
 393                                 !(s->verify_mode & SSL_VERIFY_PEER) ||
 394                                 /* if SSL_VERIFY_CLIENT_ONCE is set,
 395                                  * don't request cert during re-negotiation: */
 396                                 ((s->session->peer != NULL) &&
 397                                  (s->verify_mode & SSL_VERIFY_CLIENT_ONCE)) ||
 398                                 /* never request cert in anonymous ciphersuites
 399                                  * (see section "Certificate request" in SSL 3 drafts
 400                                  * and in RFC 2246): */
 401                                 ((s->s3->tmp.new_cipher->algorithms & SSL_aNULL) &&
 402                                  /* ... except when the application insists on verification
 403                                   * (against the specs, but s3_clnt.c accepts this for SSL 3) */
 404                                  !(s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) ||
 405                                  /* never request cert in Kerberos ciphersuites */
 406                                 (s->s3->tmp.new_cipher->algorithms & SSL_aKRB5))
 407                                 {
 408                                 /* no cert request */
 409                                 skip=1;
 410                                 s->s3->tmp.cert_request=0;
 411                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 412                                 }
 413                         else
 414                                 {
 415                                 s->s3->tmp.cert_request=1;
 416                                 ret=ssl3_send_certificate_request(s);
 417                                 if (ret <= 0) goto end;
 418 #ifndef NETSCAPE_HANG_BUG
 419                                 s->state=SSL3_ST_SW_SRVR_DONE_A;
 420 #else
 421                                 s->state=SSL3_ST_SW_FLUSH;
 422                                 s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 423 #endif
 424                                 s->init_num=0;
 425                                 }
 426                         break;
 427
 428                 case SSL3_ST_SW_SRVR_DONE_A:
 429                 case SSL3_ST_SW_SRVR_DONE_B:
 430                         ret=ssl3_send_server_done(s);
 431                         if (ret <= 0) goto end;
 432                         s->s3->tmp.next_state=SSL3_ST_SR_CERT_A;
 433                         s->state=SSL3_ST_SW_FLUSH;
 434                         s->init_num=0;
 435                         break;
 436
 437                 case SSL3_ST_SW_FLUSH:
 438                         /* number of bytes to be flushed */
 439                         num1=BIO_ctrl(s->wbio,BIO_CTRL_INFO,0,NULL);
 440                         if (num1 > 0)
 441                                 {
 442                                 s->rwstate=SSL_WRITING;
 443                                 num1=BIO_flush(s->wbio);
 444                                 if (num1 <= 0) { ret= -1; goto end; }
 445                                 s->rwstate=SSL_NOTHING;
 446                                 }
 447
 448                         s->state=s->s3->tmp.next_state;
 449                         break;
 450
 451                 case SSL3_ST_SR_CERT_A:
 452                 case SSL3_ST_SR_CERT_B:
 453                         /* Check for second client hello (MS SGC) */
 454                         ret = ssl3_check_client_hello(s);
 455                         if (ret <= 0)
 456                                 goto end;
 457                         if (ret == 2)
 458                                 s->state = SSL3_ST_SR_CLNT_HELLO_C;
 459                         else {
 460                                 if (s->s3->tmp.cert_request)
 461                                         {
 462                                         ret=ssl3_get_client_certificate(s);
 463                                         if (ret <= 0) goto end;
 464                                         }
 465                                 s->init_num=0;
 466                                 s->state=SSL3_ST_SR_KEY_EXCH_A;
 467                         }
 468                         break;
 469
 470                 case SSL3_ST_SR_KEY_EXCH_A:
 471                 case SSL3_ST_SR_KEY_EXCH_B:
 472                         ret=ssl3_get_client_key_exchange(s);
 473                         if (ret <= 0)
 474                                 goto end;
 475                         if (ret == 2)
 476                                 {
 477                                 /* For the ECDH ciphersuites when
 478                                  * the client sends its ECDH pub key in
 479                                  * a certificate, the CertificateVerify
 480                                  * message is not sent.
 481                                  */
 482                                 s->state=SSL3_ST_SR_FINISHED_A;
 483                                 s->init_num = 0;
 484                                 }
 485                         else
 486                                 {
 487                                 s->state=SSL3_ST_SR_CERT_VRFY_A;
 488                                 s->init_num=0;
 489
 490                                 /* We need to get hashes here so if there is
 491                                  * a client cert, it can be verified
 492                                  */
 493                                 s->method->ssl3_enc->cert_verify_mac(s,
 494                                     &(s->s3->finish_dgst1),
 495                                     &(s->s3->tmp.cert_verify_md[0]));
 496                                 s->method->ssl3_enc->cert_verify_mac(s,
 497                                     &(s->s3->finish_dgst2),
 498                                     &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]));
 499                                 }
 500                         break;
 501
 502                 case SSL3_ST_SR_CERT_VRFY_A:
 503                 case SSL3_ST_SR_CERT_VRFY_B:
 504
 505                         /* we should decide if we expected this one */
 506                         ret=ssl3_get_cert_verify(s);
 507                         if (ret <= 0) goto end;
 508
 509                         s->state=SSL3_ST_SR_FINISHED_A;
 510                         s->init_num=0;
 511                         break;
 512
 513                 case SSL3_ST_SR_FINISHED_A:
 514                 case SSL3_ST_SR_FINISHED_B:
 515                         ret=ssl3_get_finished(s,SSL3_ST_SR_FINISHED_A,
 516                                 SSL3_ST_SR_FINISHED_B);
 517                         if (ret <= 0) goto end;
 518                         if (s->hit)
 519                                 s->state=SSL_ST_OK;
 520 #ifndef OPENSSL_NO_TLSEXT
 521                         else if (s->tlsext_ticket_expected)
 522                                 s->state=SSL3_ST_SW_SESSION_TICKET_A;
 523 #endif
 524                         else
 525                                 s->state=SSL3_ST_SW_CHANGE_A;
 526                         s->init_num=0;
 527                         break;
 528
 529 #ifndef OPENSSL_NO_TLSEXT
 530                 case SSL3_ST_SW_SESSION_TICKET_A:
 531                 case SSL3_ST_SW_SESSION_TICKET_B:
 532                         ret=ssl3_send_newsession_ticket(s);
 533                         if (ret <= 0) goto end;
 534                         s->state=SSL3_ST_SW_CHANGE_A;
 535                         s->init_num=0;
 536                         break;
 537
 538                 case SSL3_ST_SW_CERT_STATUS_A:
 539                 case SSL3_ST_SW_CERT_STATUS_B:
 540                         ret=ssl3_send_cert_status(s);
 541                         if (ret <= 0) goto end;
 542                         s->state=SSL3_ST_SW_KEY_EXCH_A;
 543                         s->init_num=0;
 544                         break;
 545
 546 #endif
 547
 548                 case SSL3_ST_SW_CHANGE_A:
 549                 case SSL3_ST_SW_CHANGE_B:
 550
 551                         s->session->cipher=s->s3->tmp.new_cipher;
 552                         if (!s->method->ssl3_enc->setup_key_block(s))
 553                                 { ret= -1; goto end; }
 554
 555                         ret=ssl3_send_change_cipher_spec(s,
 556                                 SSL3_ST_SW_CHANGE_A,SSL3_ST_SW_CHANGE_B);
 557
 558                         if (ret <= 0) goto end;
 559                         s->state=SSL3_ST_SW_FINISHED_A;
 560                         s->init_num=0;
 561
 562                         if (!s->method->ssl3_enc->change_cipher_state(s,
 563                                 SSL3_CHANGE_CIPHER_SERVER_WRITE))
 564                                 {
 565                                 ret= -1;
 566                                 goto end;
 567                                 }
 568
 569                         break;
 570
 571                 case SSL3_ST_SW_FINISHED_A:
 572                 case SSL3_ST_SW_FINISHED_B:
 573                         ret=ssl3_send_finished(s,
 574                                 SSL3_ST_SW_FINISHED_A,SSL3_ST_SW_FINISHED_B,
 575                                 s->method->ssl3_enc->server_finished_label,
 576                                 s->method->ssl3_enc->server_finished_label_len);
 577                         if (ret <= 0) goto end;
 578                         s->state=SSL3_ST_SW_FLUSH;
 579                         if (s->hit)
 580                                 s->s3->tmp.next_state=SSL3_ST_SR_FINISHED_A;
 581                         else
 582                                 s->s3->tmp.next_state=SSL_ST_OK;
 583                         s->init_num=0;
 584                         break;
 585
 586                 case SSL_ST_OK:
 587                         /* clean a few things up */
 588                         ssl3_cleanup_key_block(s);
 589
 590                         BUF_MEM_free(s->init_buf);
 591                         s->init_buf=NULL;
 592
 593                         /* remove buffering on output */
 594                         ssl_free_wbio_buffer(s);
 595
 596                         s->init_num=0;
 597
 598                         if (s->new_session == 2) /* skipped if we just sent a HelloRequest */
 599                                 {
 600                                 /* actually not necessarily a 'new' session unless
 601                                  * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is set */
 602
 603                                 s->new_session=0;
 604
 605                                 ssl_update_cache(s,SSL_SESS_CACHE_SERVER);
 606
 607                                 s->ctx->stats.sess_accept_good++;
 608                                 /* s->server=1; */
 609                                 s->handshake_func=ssl3_accept;
 610
 611                                 if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 612                                 }
 613
 614                         ret = 1;
 615                         goto end;
 616                         /* break; */
 617
 618                 default:
 619                         SSLerr(SSL_F_SSL3_ACCEPT,SSL_R_UNKNOWN_STATE);
 620                         ret= -1;
 621                         goto end;
 622                         /* break; */
 623                         }
 624
 625                 if (!s->s3->tmp.reuse_message && !skip)
 626                         {
 627                         if (s->debug)
 628                                 {
 629                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 630                                         goto end;
 631                                 }
 632
 633
 634                         if ((cb != NULL) && (s->state != state))
 635                                 {
 636                                 new_state=s->state;
 637                                 s->state=state;
 638                                 cb(s,SSL_CB_ACCEPT_LOOP,1);
 639                                 s->state=new_state;
 640                                 }
 641                         }
 642                 skip=0;
 643                 }
 644 end:
 645         /* BIO_flush(s->wbio); */
 646
 647         s->in_handshake--;
 648         if (cb != NULL)
 649                 cb(s,SSL_CB_ACCEPT_EXIT,ret);
 650         return(ret);
 651         }
 652
 653 int ssl3_send_hello_request(SSL *s)
 654         {
 655         unsigned char *p;
 656
 657         if (s->state == SSL3_ST_SW_HELLO_REQ_A)
 658                 {
 659                 p=(unsigned char *)s->init_buf->data;
 660                 *(p++)=SSL3_MT_HELLO_REQUEST;
 661                 *(p++)=0;
 662                 *(p++)=0;
 663                 *(p++)=0;
 664
 665                 s->state=SSL3_ST_SW_HELLO_REQ_B;
 666                 /* number of bytes to write */
 667                 s->init_num=4;
 668                 s->init_off=0;
 669                 }
 670
 671         /* SSL3_ST_SW_HELLO_REQ_B */
 672         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 673         }
 674
 675 int ssl3_check_client_hello(SSL *s)
 676         {
 677         int ok;
 678         long n;
 679
 680         /* this function is called when we really expect a Certificate message,
 681          * so permit appropriate message length */
 682         n=s->method->ssl_get_message(s,
 683                 SSL3_ST_SR_CERT_A,
 684                 SSL3_ST_SR_CERT_B,
 685                 -1,
 686                 s->max_cert_list,
 687                 &ok);
 688         if (!ok) return((int)n);
 689         s->s3->tmp.reuse_message = 1;
 690         if (s->s3->tmp.message_type == SSL3_MT_CLIENT_HELLO)
 691                 {
 692                 /* Throw away what we have done so far in the current handshake,
 693                  * which will now be aborted. (A full SSL_clear would be too much.)
 694                  * I hope that tmp.dh is the only thing that may need to be cleared
 695                  * when a handshake is not completed ... */
 696 #ifndef OPENSSL_NO_DH
 697                 if (s->s3->tmp.dh != NULL)
 698                         {
 699                         DH_free(s->s3->tmp.dh);
 700                         s->s3->tmp.dh = NULL;
 701                         }
 702 #endif
 703                 return 2;
 704                 }
 705         return 1;
 706 }
 707
 708 int ssl3_get_client_hello(SSL *s)
 709         {
 710         int i,j,ok,al,ret= -1;
 711         unsigned int cookie_len;
 712         long n;
 713         unsigned long id;
 714         unsigned char *p,*d,*q;
 715         SSL_CIPHER *c;
 716 #ifndef OPENSSL_NO_COMP
 717         SSL_COMP *comp=NULL;
 718 #endif
 719         STACK_OF(SSL_CIPHER) *ciphers=NULL;
 720
 721         /* We do this so that we will respond with our native type.
 722          * If we are TLSv1 and we get SSLv3, we will respond with TLSv1,
 723          * This down switching should be handled by a different method.
 724          * If we are SSLv3, we will respond with SSLv3, even if prompted with
 725          * TLSv1.
 726          */
 727         if (s->state == SSL3_ST_SR_CLNT_HELLO_A)
 728                 {
 729                 s->state=SSL3_ST_SR_CLNT_HELLO_B;
 730                 }
 731         s->first_packet=1;
 732         n=s->method->ssl_get_message(s,
 733                 SSL3_ST_SR_CLNT_HELLO_B,
 734                 SSL3_ST_SR_CLNT_HELLO_C,
 735                 SSL3_MT_CLIENT_HELLO,
 736                 SSL3_RT_MAX_PLAIN_LENGTH,
 737                 &ok);
 738
 739         if (!ok) return((int)n);
 740         s->first_packet=0;
 741         d=p=(unsigned char *)s->init_msg;
 742
 743         /* use version from inside client hello, not from record header
 744          * (may differ: see RFC 2246, Appendix E, second paragraph) */
 745         s->client_version=(((int)p[0])<<8)|(int)p[1];
 746         p+=2;
 747
 748         if ((s->version == DTLS1_VERSION && s->client_version > s->version) ||
 749             (s->version != DTLS1_VERSION && s->client_version < s->version))
 750                 {
 751                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_WRONG_VERSION_NUMBER);
 752                 if ((s->client_version>>8) == SSL3_VERSION_MAJOR)
 753                         {
 754                         /* similar to ssl3_get_record, send alert using remote version number */
 755                         s->version = s->client_version;
 756                         }
 757                 al = SSL_AD_PROTOCOL_VERSION;
 758                 goto f_err;
 759                 }
 760
 761         /* load the client random */
 762         memcpy(s->s3->client_random,p,SSL3_RANDOM_SIZE);
 763         p+=SSL3_RANDOM_SIZE;
 764
 765         /* get the session-id */
 766         j= *(p++);
 767
 768         s->hit=0;
 769         /* Versions before 0.9.7 always allow session reuse during renegotiation
 770          * (i.e. when s->new_session is true), option
 771          * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION is new with 0.9.7.
 772          * Maybe this optional behaviour should always have been the default,
 773          * but we cannot safely change the default behaviour (or new applications
 774          * might be written that become totally unsecure when compiled with
 775          * an earlier library version)
 776          */
 777         if ((s->new_session && (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION)))
 778                 {
 779                 if (!ssl_get_new_session(s,1))
 780                         goto err;
 781                 }
 782         else
 783                 {
 784                 i=ssl_get_prev_session(s, p, j, d + n);
 785                 if (i == 1)
 786                         { /* previous session */
 787                         s->hit=1;
 788                         }
 789                 else if (i == -1)
 790                         goto err;
 791                 else /* i == 0 */
 792                         {
 793                         if (!ssl_get_new_session(s,1))
 794                                 goto err;
 795                         }
 796                 }
 797
 798         p+=j;
 799
 800         if (s->version == DTLS1_VERSION)
 801                 {
 802                 /* cookie stuff */
 803                 cookie_len = *(p++);
 804
 805                 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 806                         s->d1->send_cookie == 0)
 807                         {
 808                         /* HelloVerifyMessage has already been sent */
 809                         if ( cookie_len != s->d1->cookie_len)
 810                                 {
 811                                 al = SSL_AD_HANDSHAKE_FAILURE;
 812                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 813                                 goto f_err;
 814                                 }
 815                         }
 816
 817                 /*
 818                  * The ClientHello may contain a cookie even if the
 819                  * HelloVerify message has not been sent--make sure that it
 820                  * does not cause an overflow.
 821                  */
 822                 if ( cookie_len > sizeof(s->d1->rcvd_cookie))
 823                         {
 824                         /* too much data */
 825                         al = SSL_AD_DECODE_ERROR;
 826                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
 827                         goto f_err;
 828                         }
 829
 830                 /* verify the cookie if appropriate option is set. */
 831                 if ( (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) &&
 832                         cookie_len > 0)
 833                         {
 834                         memcpy(s->d1->rcvd_cookie, p, cookie_len);
 835
 836                         if ( s->ctx->app_verify_cookie_cb != NULL)
 837                                 {
 838                                 if ( s->ctx->app_verify_cookie_cb(s, s->d1->rcvd_cookie,
 839                                         cookie_len) == 0)
 840                                         {
 841                                         al=SSL_AD_HANDSHAKE_FAILURE;
 842                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 843                                                 SSL_R_COOKIE_MISMATCH);
 844                                         goto f_err;
 845                                         }
 846                                 /* else cookie verification succeeded */
 847                                 }
 848                         else if ( memcmp(s->d1->rcvd_cookie, s->d1->cookie,
 849                                                   s->d1->cookie_len) != 0) /* default verification */
 850                                 {
 851                                         al=SSL_AD_HANDSHAKE_FAILURE;
 852                                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,
 853                                                 SSL_R_COOKIE_MISMATCH);
 854                                         goto f_err;
 855                                 }
 856                         }
 857
 858                 p += cookie_len;
 859                 }
 860
 861         n2s(p,i);
 862         if ((i == 0) && (j != 0))
 863                 {
 864                 /* we need a cipher if we are not resuming a session */
 865                 al=SSL_AD_ILLEGAL_PARAMETER;
 866                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_SPECIFIED);
 867                 goto f_err;
 868                 }
 869         if ((p+i) >= (d+n))
 870                 {
 871                 /* not enough data */
 872                 al=SSL_AD_DECODE_ERROR;
 873                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 874                 goto f_err;
 875                 }
 876         if ((i > 0) && (ssl_bytes_to_cipher_list(s,p,i,&(ciphers))
 877                 == NULL))
 878                 {
 879                 goto err;
 880                 }
 881         p+=i;
 882
 883         /* If it is a hit, check that the cipher is in the list */
 884         if ((s->hit) && (i > 0))
 885                 {
 886                 j=0;
 887                 id=s->session->cipher->id;
 888
 889 #ifdef CIPHER_DEBUG
 890                 printf("client sent %d ciphers\n",sk_num(ciphers));
 891 #endif
 892                 for (i=0; i<sk_SSL_CIPHER_num(ciphers); i++)
 893                         {
 894                         c=sk_SSL_CIPHER_value(ciphers,i);
 895 #ifdef CIPHER_DEBUG
 896                         printf("client [%2d of %2d]:%s\n",
 897                                 i,sk_num(ciphers),SSL_CIPHER_get_name(c));
 898 #endif
 899                         if (c->id == id)
 900                                 {
 901                                 j=1;
 902                                 break;
 903                                 }
 904                         }
 905                 if (j == 0)
 906                         {
 907                         if ((s->options & SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG) && (sk_SSL_CIPHER_num(ciphers) == 1))
 908                                 {
 909                                 /* Very bad for multi-threading.... */
 910                                 s->session->cipher=sk_SSL_CIPHER_value(ciphers, 0);
 911                                 }
 912                         else
 913                                 {
 914                                 /* we need to have the cipher in the cipher
 915                                  * list if we are asked to reuse it */
 916                                 al=SSL_AD_ILLEGAL_PARAMETER;
 917                                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_REQUIRED_CIPHER_MISSING);
 918                                 goto f_err;
 919                                 }
 920                         }
 921                 }
 922
 923         /* compression */
 924         i= *(p++);
 925         if ((p+i) > (d+n))
 926                 {
 927                 /* not enough data */
 928                 al=SSL_AD_DECODE_ERROR;
 929                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
 930                 goto f_err;
 931                 }
 932         q=p;
 933         for (j=0; j<i; j++)
 934                 {
 935                 if (p[j] == 0) break;
 936                 }
 937
 938         p+=i;
 939         if (j >= i)
 940                 {
 941                 /* no compress */
 942                 al=SSL_AD_DECODE_ERROR;
 943                 SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_COMPRESSION_SPECIFIED);
 944                 goto f_err;
 945                 }
 946
 947 #ifndef OPENSSL_NO_TLSEXT
 948         /* TLS extensions*/
 949         if (s->version > SSL3_VERSION)
 950                 {
 951                 if (!ssl_parse_clienthello_tlsext(s,&p,d,n, &al))
 952                         {
 953                         /* 'al' set by ssl_parse_clienthello_tlsext */
 954                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_PARSE_TLSEXT);
 955                         goto f_err;
 956                         }
 957                 }
 958                 if (ssl_check_clienthello_tlsext(s) <= 0) {
 959                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 960                         goto err;
 961                 }
 962 #endif
 963         /* Worst case, we will use the NULL compression, but if we have other
 964          * options, we will now look for them.  We have i-1 compression
 965          * algorithms from the client, starting at q. */
 966         s->s3->tmp.new_compression=NULL;
 967 #ifndef OPENSSL_NO_COMP
 968         if (s->ctx->comp_methods != NULL)
 969                 { /* See if we have a match */
 970                 int m,nn,o,v,done=0;
 971
 972                 nn=sk_SSL_COMP_num(s->ctx->comp_methods);
 973                 for (m=0; m<nn; m++)
 974                         {
 975                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,m);
 976                         v=comp->id;
 977                         for (o=0; o<i; o++)
 978                                 {
 979                                 if (v == q[o])
 980                                         {
 981                                         done=1;
 982                                         break;
 983                                         }
 984                                 }
 985                         if (done) break;
 986                         }
 987                 if (done)
 988                         s->s3->tmp.new_compression=comp;
 989                 else
 990                         comp=NULL;
 991                 }
 992 #endif
 993
 994         /* TLS does not mind if there is extra stuff */
 995 #if 0   /* SSL 3.0 does not mind either, so we should disable this test
 996          * (was enabled in 0.9.6d through 0.9.6j and 0.9.7 through 0.9.7b,
 997          * in earlier SSLeay/OpenSSL releases this test existed but was buggy) */
 998         if (s->version == SSL3_VERSION)
 999                 {
1000                 if (p < (d+n))
1001                         {
1002                         /* wrong number of bytes,
1003                          * there could be more to follow */
1004                         al=SSL_AD_DECODE_ERROR;
1005                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_LENGTH_MISMATCH);
1006                         goto f_err;
1007                         }
1008                 }
1009 #endif
1010
1011         /* Given s->session->ciphers and SSL_get_ciphers, we must
1012          * pick a cipher */
1013
1014         if (!s->hit)
1015                 {
1016 #ifdef OPENSSL_NO_COMP
1017                 s->session->compress_meth=0;
1018 #else
1019                 s->session->compress_meth=(comp == NULL)?0:comp->id;
1020 #endif
1021                 if (s->session->ciphers != NULL)
1022                         sk_SSL_CIPHER_free(s->session->ciphers);
1023                 s->session->ciphers=ciphers;
1024                 if (ciphers == NULL)
1025                         {
1026                         al=SSL_AD_ILLEGAL_PARAMETER;
1027                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_CIPHERS_PASSED);
1028                         goto f_err;
1029                         }
1030                 ciphers=NULL;
1031                 c=ssl3_choose_cipher(s,s->session->ciphers,
1032                                      SSL_get_ciphers(s));
1033
1034                 if (c == NULL)
1035                         {
1036                         al=SSL_AD_HANDSHAKE_FAILURE;
1037                         SSLerr(SSL_F_SSL3_GET_CLIENT_HELLO,SSL_R_NO_SHARED_CIPHER);
1038                         goto f_err;
1039                         }
1040                 s->s3->tmp.new_cipher=c;
1041                 }
1042         else
1043                 {
1044                 /* Session-id reuse */
1045 #ifdef REUSE_CIPHER_BUG
1046                 STACK_OF(SSL_CIPHER) *sk;
1047                 SSL_CIPHER *nc=NULL;
1048                 SSL_CIPHER *ec=NULL;
1049
1050                 if (s->options & SSL_OP_NETSCAPE_DEMO_CIPHER_CHANGE_BUG)
1051                         {
1052                         sk=s->session->ciphers;
1053                         for (i=0; i<sk_SSL_CIPHER_num(sk); i++)
1054                                 {
1055                                 c=sk_SSL_CIPHER_value(sk,i);
1056                                 if (c->algorithms & SSL_eNULL)
1057                                         nc=c;
1058                                 if (SSL_C_IS_EXPORT(c))
1059                                         ec=c;
1060                                 }
1061                         if (nc != NULL)
1062                                 s->s3->tmp.new_cipher=nc;
1063                         else if (ec != NULL)
1064                                 s->s3->tmp.new_cipher=ec;
1065                         else
1066                                 s->s3->tmp.new_cipher=s->session->cipher;
1067                         }
1068                 else
1069 #endif
1070                 s->s3->tmp.new_cipher=s->session->cipher;
1071                 }
1072
1073         /* we now have the following setup.
1074          * client_random
1075          * cipher_list          - our prefered list of ciphers
1076          * ciphers              - the clients prefered list of ciphers
1077          * compression          - basically ignored right now
1078          * ssl version is set   - sslv3
1079          * s->session           - The ssl session has been setup.
1080          * s->hit               - session reuse flag
1081          * s->tmp.new_cipher    - the new cipher to use.
1082          */
1083
1084         ret=1;
1085         if (0)
1086                 {
1087 f_err:
1088                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1089                 }
1090 err:
1091         if (ciphers != NULL) sk_SSL_CIPHER_free(ciphers);
1092         return(ret);
1093         }
1094
1095 int ssl3_send_server_hello(SSL *s)
1096         {
1097         unsigned char *buf;
1098         unsigned char *p,*d;
1099         int i,sl;
1100         unsigned long l,Time;
1101
1102         if (s->state == SSL3_ST_SW_SRVR_HELLO_A)
1103                 {
1104                 buf=(unsigned char *)s->init_buf->data;
1105                 p=s->s3->server_random;
1106                 Time=(unsigned long)time(NULL);                 /* Time */
1107                 l2n(Time,p);
1108                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
1109                         return -1;
1110                 /* Do the message type and length last */
1111                 d=p= &(buf[4]);
1112
1113                 *(p++)=s->version>>8;
1114                 *(p++)=s->version&0xff;
1115
1116                 /* Random stuff */
1117                 memcpy(p,s->s3->server_random,SSL3_RANDOM_SIZE);
1118                 p+=SSL3_RANDOM_SIZE;
1119
1120                 /* now in theory we have 3 options to sending back the
1121                  * session id.  If it is a re-use, we send back the
1122                  * old session-id, if it is a new session, we send
1123                  * back the new session-id or we send back a 0 length
1124                  * session-id if we want it to be single use.
1125                  * Currently I will not implement the '0' length session-id
1126                  * 12-Jan-98 - I'll now support the '0' length stuff.
1127                  *
1128                  * We also have an additional case where stateless session
1129                  * resumption is successful: we always send back the old
1130                  * session id. In this case s->hit is non zero: this can
1131                  * only happen if stateless session resumption is succesful
1132                  * if session caching is disabled so existing functionality
1133                  * is unaffected.
1134                  */
1135                 if (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
1136                         && !s->hit)
1137                         s->session->session_id_length=0;
1138
1139                 sl=s->session->session_id_length;
1140                 if (sl > (int)sizeof(s->session->session_id))
1141                         {
1142                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
1143                         return -1;
1144                         }
1145                 *(p++)=sl;
1146                 memcpy(p,s->session->session_id,sl);
1147                 p+=sl;
1148
1149                 /* put the cipher */
1150                 i=ssl3_put_cipher_by_char(s->s3->tmp.new_cipher,p);
1151                 p+=i;
1152
1153                 /* put the compression method */
1154 #ifdef OPENSSL_NO_COMP
1155                         *(p++)=0;
1156 #else
1157                 if (s->s3->tmp.new_compression == NULL)
1158                         *(p++)=0;
1159                 else
1160                         *(p++)=s->s3->tmp.new_compression->id;
1161 #endif
1162 #ifndef OPENSSL_NO_TLSEXT
1163                 if ((p = ssl_add_serverhello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
1164                         {
1165                         SSLerr(SSL_F_SSL3_SEND_SERVER_HELLO,ERR_R_INTERNAL_ERROR);
1166                         return -1;
1167                         }
1168 #endif
1169                 /* do the header */
1170                 l=(p-d);
1171                 d=buf;
1172                 *(d++)=SSL3_MT_SERVER_HELLO;
1173                 l2n3(l,d);
1174
1175                 s->state=SSL3_ST_SW_CLNT_HELLO_B;
1176                 /* number of bytes to write */
1177                 s->init_num=p-buf;
1178                 s->init_off=0;
1179                 }
1180
1181         /* SSL3_ST_SW_CLNT_HELLO_B */
1182         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1183         }
1184
1185 int ssl3_send_server_done(SSL *s)
1186         {
1187         unsigned char *p;
1188
1189         if (s->state == SSL3_ST_SW_SRVR_DONE_A)
1190                 {
1191                 p=(unsigned char *)s->init_buf->data;
1192
1193                 /* do the header */
1194                 *(p++)=SSL3_MT_SERVER_DONE;
1195                 *(p++)=0;
1196                 *(p++)=0;
1197                 *(p++)=0;
1198
1199                 s->state=SSL3_ST_SW_SRVR_DONE_B;
1200                 /* number of bytes to write */
1201                 s->init_num=4;
1202                 s->init_off=0;
1203                 }
1204
1205         /* SSL3_ST_SW_SRVR_DONE_B */
1206         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1207         }
1208
1209 int ssl3_send_server_key_exchange(SSL *s)
1210         {
1211 #ifndef OPENSSL_NO_RSA
1212         unsigned char *q;
1213         int j,num;
1214         RSA *rsa;
1215         unsigned char md_buf[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
1216         unsigned int u;
1217 #endif
1218 #ifndef OPENSSL_NO_DH
1219         DH *dh=NULL,*dhp;
1220 #endif
1221 #ifndef OPENSSL_NO_ECDH
1222         EC_KEY *ecdh=NULL, *ecdhp;
1223         unsigned char *encodedPoint = NULL;
1224         int encodedlen = 0;
1225         int curve_id = 0;
1226         BN_CTX *bn_ctx = NULL;
1227 #endif
1228         EVP_PKEY *pkey;
1229         unsigned char *p,*d;
1230         int al,i;
1231         unsigned long type;
1232         int n;
1233         CERT *cert;
1234         BIGNUM *r[4];
1235         int nr[4],kn;
1236         BUF_MEM *buf;
1237         EVP_MD_CTX md_ctx;
1238
1239         EVP_MD_CTX_init(&md_ctx);
1240         if (s->state == SSL3_ST_SW_KEY_EXCH_A)
1241                 {
1242                 type=s->s3->tmp.new_cipher->algorithms & SSL_MKEY_MASK;
1243                 cert=s->cert;
1244
1245                 buf=s->init_buf;
1246
1247                 r[0]=r[1]=r[2]=r[3]=NULL;
1248                 n=0;
1249 #ifndef OPENSSL_NO_RSA
1250                 if (type & SSL_kRSA)
1251                         {
1252                         rsa=cert->rsa_tmp;
1253                         if ((rsa == NULL) && (s->cert->rsa_tmp_cb != NULL))
1254                                 {
1255                                 rsa=s->cert->rsa_tmp_cb(s,
1256                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1257                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1258                                 if(rsa == NULL)
1259                                 {
1260                                         al=SSL_AD_HANDSHAKE_FAILURE;
1261                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ERROR_GENERATING_TMP_RSA_KEY);
1262                                         goto f_err;
1263                                 }
1264                                 RSA_up_ref(rsa);
1265                                 cert->rsa_tmp=rsa;
1266                                 }
1267                         if (rsa == NULL)
1268                                 {
1269                                 al=SSL_AD_HANDSHAKE_FAILURE;
1270                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_KEY);
1271                                 goto f_err;
1272                                 }
1273                         r[0]=rsa->n;
1274                         r[1]=rsa->e;
1275                         s->s3->tmp.use_rsa_tmp=1;
1276                         }
1277                 else
1278 #endif
1279 #ifndef OPENSSL_NO_DH
1280                         if (type & SSL_kEDH)
1281                         {
1282                         dhp=cert->dh_tmp;
1283                         if ((dhp == NULL) && (s->cert->dh_tmp_cb != NULL))
1284                                 dhp=s->cert->dh_tmp_cb(s,
1285                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1286                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1287                         if (dhp == NULL)
1288                                 {
1289                                 al=SSL_AD_HANDSHAKE_FAILURE;
1290                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1291                                 goto f_err;
1292                                 }
1293
1294                         if (s->s3->tmp.dh != NULL)
1295                                 {
1296                                 DH_free(dh);
1297                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1298                                 goto err;
1299                                 }
1300
1301                         if ((dh=DHparams_dup(dhp)) == NULL)
1302                                 {
1303                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1304                                 goto err;
1305                                 }
1306
1307                         s->s3->tmp.dh=dh;
1308                         if ((dhp->pub_key == NULL ||
1309                              dhp->priv_key == NULL ||
1310                              (s->options & SSL_OP_SINGLE_DH_USE)))
1311                                 {
1312                                 if(!DH_generate_key(dh))
1313                                     {
1314                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,
1315                                            ERR_R_DH_LIB);
1316                                     goto err;
1317                                     }
1318                                 }
1319                         else
1320                                 {
1321                                 dh->pub_key=BN_dup(dhp->pub_key);
1322                                 dh->priv_key=BN_dup(dhp->priv_key);
1323                                 if ((dh->pub_key == NULL) ||
1324                                         (dh->priv_key == NULL))
1325                                         {
1326                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_DH_LIB);
1327                                         goto err;
1328                                         }
1329                                 }
1330                         r[0]=dh->p;
1331                         r[1]=dh->g;
1332                         r[2]=dh->pub_key;
1333                         }
1334                 else
1335 #endif
1336 #ifndef OPENSSL_NO_ECDH
1337                         if (type & SSL_kECDHE)
1338                         {
1339                         const EC_GROUP *group;
1340
1341                         ecdhp=cert->ecdh_tmp;
1342                         if ((ecdhp == NULL) && (s->cert->ecdh_tmp_cb != NULL))
1343                                 {
1344                                 ecdhp=s->cert->ecdh_tmp_cb(s,
1345                                       SSL_C_IS_EXPORT(s->s3->tmp.new_cipher),
1346                                       SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher));
1347                                 }
1348                         if (ecdhp == NULL)
1349                                 {
1350                                 al=SSL_AD_HANDSHAKE_FAILURE;
1351                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
1352                                 goto f_err;
1353                                 }
1354
1355                         if (s->s3->tmp.ecdh != NULL)
1356                                 {
1357                                 EC_KEY_free(s->s3->tmp.ecdh);
1358                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
1359                                 goto err;
1360                                 }
1361
1362                         /* Duplicate the ECDH structure. */
1363                         if (ecdhp == NULL)
1364                                 {
1365                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1366                                 goto err;
1367                                 }
1368                         if (!EC_KEY_up_ref(ecdhp))
1369                                 {
1370                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1371                                 goto err;
1372                                 }
1373                         ecdh = ecdhp;
1374
1375                         s->s3->tmp.ecdh=ecdh;
1376                         if ((EC_KEY_get0_public_key(ecdh) == NULL) ||
1377                             (EC_KEY_get0_private_key(ecdh) == NULL) ||
1378                             (s->options & SSL_OP_SINGLE_ECDH_USE))
1379                                 {
1380                                 if(!EC_KEY_generate_key(ecdh))
1381                                     {
1382                                     SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1383                                     goto err;
1384                                     }
1385                                 }
1386
1387                         if (((group = EC_KEY_get0_group(ecdh)) == NULL) ||
1388                             (EC_KEY_get0_public_key(ecdh)  == NULL) ||
1389                             (EC_KEY_get0_private_key(ecdh) == NULL))
1390                                 {
1391                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1392                                 goto err;
1393                                 }
1394
1395                         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1396                             (EC_GROUP_get_degree(group) > 163))
1397                                 {
1398                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1399                                 goto err;
1400                                 }
1401
1402                         /* XXX: For now, we only support ephemeral ECDH
1403                          * keys over named (not generic) curves. For
1404                          * supported named curves, curve_id is non-zero.
1405                          */
1406                         if ((curve_id =
1407                             nid2curve_id(EC_GROUP_get_curve_name(group)))
1408                             == 0)
1409                                 {
1410                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
1411                                 goto err;
1412                                 }
1413
1414                         /* Encode the public key.
1415                          * First check the size of encoding and
1416                          * allocate memory accordingly.
1417                          */
1418                         encodedlen = EC_POINT_point2oct(group,
1419                             EC_KEY_get0_public_key(ecdh),
1420                             POINT_CONVERSION_UNCOMPRESSED,
1421                             NULL, 0, NULL);
1422
1423                         encodedPoint = (unsigned char *)
1424                             OPENSSL_malloc(encodedlen*sizeof(unsigned char));
1425                         bn_ctx = BN_CTX_new();
1426                         if ((encodedPoint == NULL) || (bn_ctx == NULL))
1427                                 {
1428                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1429                                 goto err;
1430                                 }
1431
1432
1433                         encodedlen = EC_POINT_point2oct(group,
1434                             EC_KEY_get0_public_key(ecdh),
1435                             POINT_CONVERSION_UNCOMPRESSED,
1436                             encodedPoint, encodedlen, bn_ctx);
1437
1438                         if (encodedlen == 0)
1439                                 {
1440                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_R_ECDH_LIB);
1441                                 goto err;
1442                                 }
1443
1444                         BN_CTX_free(bn_ctx);  bn_ctx=NULL;
1445
1446                         /* XXX: For now, we only support named (not
1447                          * generic) curves in ECDH ephemeral key exchanges.
1448                          * In this situation, we need four additional bytes
1449                          * to encode the entire ServerECDHParams
1450                          * structure.
1451                          */
1452                         n = 4 + encodedlen;
1453
1454                         /* We'll generate the serverKeyExchange message
1455                          * explicitly so we can set these to NULLs
1456                          */
1457                         r[0]=NULL;
1458                         r[1]=NULL;
1459                         r[2]=NULL;
1460                         r[3]=NULL;
1461                         }
1462                 else
1463 #endif /* !OPENSSL_NO_ECDH */
1464                         {
1465                         al=SSL_AD_HANDSHAKE_FAILURE;
1466                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
1467                         goto f_err;
1468                         }
1469                 for (i=0; r[i] != NULL; i++)
1470                         {
1471                         nr[i]=BN_num_bytes(r[i]);
1472                         n+=2+nr[i];
1473                         }
1474
1475                 if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
1476                         {
1477                         if ((pkey=ssl_get_sign_pkey(s,s->s3->tmp.new_cipher))
1478                                 == NULL)
1479                                 {
1480                                 al=SSL_AD_DECODE_ERROR;
1481                                 goto f_err;
1482                                 }
1483                         kn=EVP_PKEY_size(pkey);
1484                         }
1485                 else
1486                         {
1487                         pkey=NULL;
1488                         kn=0;
1489                         }
1490
1491                 if (!BUF_MEM_grow_clean(buf,n+4+kn))
1492                         {
1493                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_BUF);
1494                         goto err;
1495                         }
1496                 d=(unsigned char *)s->init_buf->data;
1497                 p= &(d[4]);
1498
1499                 for (i=0; r[i] != NULL; i++)
1500                         {
1501                         s2n(nr[i],p);
1502                         BN_bn2bin(r[i],p);
1503                         p+=nr[i];
1504                         }
1505
1506 #ifndef OPENSSL_NO_ECDH
1507                 if (type & SSL_kECDHE)
1508                         {
1509                         /* XXX: For now, we only support named (not generic) curves.
1510                          * In this situation, the serverKeyExchange message has:
1511                          * [1 byte CurveType], [2 byte CurveName]
1512                          * [1 byte length of encoded point], followed by
1513                          * the actual encoded point itself
1514                          */
1515                         *p = NAMED_CURVE_TYPE;
1516                         p += 1;
1517                         *p = 0;
1518                         p += 1;
1519                         *p = curve_id;
1520                         p += 1;
1521                         *p = encodedlen;
1522                         p += 1;
1523                         memcpy((unsigned char*)p,
1524                             (unsigned char *)encodedPoint,
1525                             encodedlen);
1526                         OPENSSL_free(encodedPoint);
1527                         p += encodedlen;
1528                         }
1529 #endif
1530
1531                 /* not anonymous */
1532                 if (pkey != NULL)
1533                         {
1534                         /* n is the length of the params, they start at &(d[4])
1535                          * and p points to the space at the end. */
1536 #ifndef OPENSSL_NO_RSA
1537                         if (pkey->type == EVP_PKEY_RSA)
1538                                 {
1539                                 q=md_buf;
1540                                 j=0;
1541                                 for (num=2; num > 0; num--)
1542                                         {
1543                                         EVP_MD_CTX_set_flags(&md_ctx,
1544                                                 EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1545                                         EVP_DigestInit_ex(&md_ctx,(num == 2)
1546                                                 ?s->ctx->md5:s->ctx->sha1, NULL);
1547                                         EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1548                                         EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1549                                         EVP_DigestUpdate(&md_ctx,&(d[4]),n);
1550                                         EVP_DigestFinal_ex(&md_ctx,q,
1551                                                 (unsigned int *)&i);
1552                                         q+=i;
1553                                         j+=i;
1554                                         }
1555                                 if (RSA_sign(NID_md5_sha1, md_buf, j,
1556                                         &(p[2]), &u, pkey->pkey.rsa) <= 0)
1557                                         {
1558                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_RSA);
1559                                         goto err;
1560                                         }
1561                                 s2n(u,p);
1562                                 n+=u+2;
1563                                 }
1564                         else
1565 #endif
1566 #if !defined(OPENSSL_NO_DSA)
1567                                 if (pkey->type == EVP_PKEY_DSA)
1568                                 {
1569                                 /* lets do DSS */
1570                                 EVP_SignInit_ex(&md_ctx,EVP_dss1(), NULL);
1571                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1572                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1573                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1574                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1575                                         (unsigned int *)&i,pkey))
1576                                         {
1577                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_DSA);
1578                                         goto err;
1579                                         }
1580                                 s2n(i,p);
1581                                 n+=i+2;
1582                                 }
1583                         else
1584 #endif
1585 #if !defined(OPENSSL_NO_ECDSA)
1586                                 if (pkey->type == EVP_PKEY_EC)
1587                                 {
1588                                 /* let's do ECDSA */
1589                                 EVP_SignInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1590                                 EVP_SignUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1591                                 EVP_SignUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1592                                 EVP_SignUpdate(&md_ctx,&(d[4]),n);
1593                                 if (!EVP_SignFinal(&md_ctx,&(p[2]),
1594                                         (unsigned int *)&i,pkey))
1595                                         {
1596                                         SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,ERR_LIB_ECDSA);
1597                                         goto err;
1598                                         }
1599                                 s2n(i,p);
1600                                 n+=i+2;
1601                                 }
1602                         else
1603 #endif
1604                                 {
1605                                 /* Is this error check actually needed? */
1606                                 al=SSL_AD_HANDSHAKE_FAILURE;
1607                                 SSLerr(SSL_F_SSL3_SEND_SERVER_KEY_EXCHANGE,SSL_R_UNKNOWN_PKEY_TYPE);
1608                                 goto f_err;
1609                                 }
1610                         }
1611
1612                 *(d++)=SSL3_MT_SERVER_KEY_EXCHANGE;
1613                 l2n3(n,d);
1614
1615                 /* we should now have things packed up, so lets send
1616                  * it off */
1617                 s->init_num=n+4;
1618                 s->init_off=0;
1619                 }
1620
1621         s->state = SSL3_ST_SW_KEY_EXCH_B;
1622         EVP_MD_CTX_cleanup(&md_ctx);
1623         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1624 f_err:
1625         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1626 err:
1627 #ifndef OPENSSL_NO_ECDH
1628         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
1629         BN_CTX_free(bn_ctx);
1630 #endif
1631         EVP_MD_CTX_cleanup(&md_ctx);
1632         return(-1);
1633         }
1634
1635 int ssl3_send_certificate_request(SSL *s)
1636         {
1637         unsigned char *p,*d;
1638         int i,j,nl,off,n;
1639         STACK_OF(X509_NAME) *sk=NULL;
1640         X509_NAME *name;
1641         BUF_MEM *buf;
1642
1643         if (s->state == SSL3_ST_SW_CERT_REQ_A)
1644                 {
1645                 buf=s->init_buf;
1646
1647                 d=p=(unsigned char *)&(buf->data[4]);
1648
1649                 /* get the list of acceptable cert types */
1650                 p++;
1651                 n=ssl3_get_req_cert_type(s,p);
1652                 d[0]=n;
1653                 p+=n;
1654                 n++;
1655
1656                 off=n;
1657                 p+=2;
1658                 n+=2;
1659
1660                 sk=SSL_get_client_CA_list(s);
1661                 nl=0;
1662                 if (sk != NULL)
1663                         {
1664                         for (i=0; i<sk_X509_NAME_num(sk); i++)
1665                                 {
1666                                 name=sk_X509_NAME_value(sk,i);
1667                                 j=i2d_X509_NAME(name,NULL);
1668                                 if (!BUF_MEM_grow_clean(buf,4+n+j+2))
1669                                         {
1670                                         SSLerr(SSL_F_SSL3_SEND_CERTIFICATE_REQUEST,ERR_R_BUF_LIB);
1671                                         goto err;
1672                                         }
1673                                 p=(unsigned char *)&(buf->data[4+n]);
1674                                 if (!(s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1675                                         {
1676                                         s2n(j,p);
1677                                         i2d_X509_NAME(name,&p);
1678                                         n+=2+j;
1679                                         nl+=2+j;
1680                                         }
1681                                 else
1682                                         {
1683                                         d=p;
1684                                         i2d_X509_NAME(name,&p);
1685                                         j-=2; s2n(j,d); j+=2;
1686                                         n+=j;
1687                                         nl+=j;
1688                                         }
1689                                 }
1690                         }
1691                 /* else no CA names */
1692                 p=(unsigned char *)&(buf->data[4+off]);
1693                 s2n(nl,p);
1694
1695                 d=(unsigned char *)buf->data;
1696                 *(d++)=SSL3_MT_CERTIFICATE_REQUEST;
1697                 l2n3(n,d);
1698
1699                 /* we should now have things packed up, so lets send
1700                  * it off */
1701
1702                 s->init_num=n+4;
1703                 s->init_off=0;
1704 #ifdef NETSCAPE_HANG_BUG
1705                 p=(unsigned char *)s->init_buf->data + s->init_num;
1706
1707                 /* do the header */
1708                 *(p++)=SSL3_MT_SERVER_DONE;
1709                 *(p++)=0;
1710                 *(p++)=0;
1711                 *(p++)=0;
1712                 s->init_num += 4;
1713 #endif
1714
1715                 s->state = SSL3_ST_SW_CERT_REQ_B;
1716                 }
1717
1718         /* SSL3_ST_SW_CERT_REQ_B */
1719         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
1720 err:
1721         return(-1);
1722         }
1723
1724 int ssl3_get_client_key_exchange(SSL *s)
1725         {
1726         int i,al,ok;
1727         long n;
1728         unsigned long l;
1729         unsigned char *p;
1730 #ifndef OPENSSL_NO_RSA
1731         RSA *rsa=NULL;
1732         EVP_PKEY *pkey=NULL;
1733 #endif
1734 #ifndef OPENSSL_NO_DH
1735         BIGNUM *pub=NULL;
1736         DH *dh_srvr;
1737 #endif
1738 #ifndef OPENSSL_NO_KRB5
1739         KSSL_ERR kssl_err;
1740 #endif /* OPENSSL_NO_KRB5 */
1741
1742 #ifndef OPENSSL_NO_ECDH
1743         EC_KEY *srvr_ecdh = NULL;
1744         EVP_PKEY *clnt_pub_pkey = NULL;
1745         EC_POINT *clnt_ecpoint = NULL;
1746         BN_CTX *bn_ctx = NULL;
1747 #endif
1748
1749         n=s->method->ssl_get_message(s,
1750                 SSL3_ST_SR_KEY_EXCH_A,
1751                 SSL3_ST_SR_KEY_EXCH_B,
1752                 SSL3_MT_CLIENT_KEY_EXCHANGE,
1753                 2048, /* ??? */
1754                 &ok);
1755
1756         if (!ok) return((int)n);
1757         p=(unsigned char *)s->init_msg;
1758
1759         l=s->s3->tmp.new_cipher->algorithms;
1760
1761 #ifndef OPENSSL_NO_RSA
1762         if (l & SSL_kRSA)
1763                 {
1764                 /* FIX THIS UP EAY EAY EAY EAY */
1765                 if (s->s3->tmp.use_rsa_tmp)
1766                         {
1767                         if ((s->cert != NULL) && (s->cert->rsa_tmp != NULL))
1768                                 rsa=s->cert->rsa_tmp;
1769                         /* Don't do a callback because rsa_tmp should
1770                          * be sent already */
1771                         if (rsa == NULL)
1772                                 {
1773                                 al=SSL_AD_HANDSHAKE_FAILURE;
1774                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_RSA_PKEY);
1775                                 goto f_err;
1776
1777                                 }
1778                         }
1779                 else
1780                         {
1781                         pkey=s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey;
1782                         if (    (pkey == NULL) ||
1783                                 (pkey->type != EVP_PKEY_RSA) ||
1784                                 (pkey->pkey.rsa == NULL))
1785                                 {
1786                                 al=SSL_AD_HANDSHAKE_FAILURE;
1787                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_RSA_CERTIFICATE);
1788                                 goto f_err;
1789                                 }
1790                         rsa=pkey->pkey.rsa;
1791                         }
1792
1793                 /* TLS and [incidentally] DTLS, including pre-0.9.8f */
1794                 if (s->version > SSL3_VERSION &&
1795                     s->client_version != DTLS1_BAD_VER)
1796                         {
1797                         n2s(p,i);
1798                         if (n != i+2)
1799                                 {
1800                                 if (!(s->options & SSL_OP_TLS_D5_BUG))
1801                                         {
1802                                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_TLS_RSA_ENCRYPTED_VALUE_LENGTH_IS_WRONG);
1803                                         goto err;
1804                                         }
1805                                 else
1806                                         p-=2;
1807                                 }
1808                         else
1809                                 n=i;
1810                         }
1811
1812                 i=RSA_private_decrypt((int)n,p,p,rsa,RSA_PKCS1_PADDING);
1813
1814                 al = -1;
1815
1816                 if (i != SSL_MAX_MASTER_KEY_LENGTH)
1817                         {
1818                         al=SSL_AD_DECODE_ERROR;
1819                         /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT); */
1820                         }
1821
1822                 if ((al == -1) && !((p[0] == (s->client_version>>8)) && (p[1] == (s->client_version & 0xff))))
1823                         {
1824                         /* The premaster secret must contain the same version number as the
1825                          * ClientHello to detect version rollback attacks (strangely, the
1826                          * protocol does not offer such protection for DH ciphersuites).
1827                          * However, buggy clients exist that send the negotiated protocol
1828                          * version instead if the server does not support the requested
1829                          * protocol version.
1830                          * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients. */
1831                         if (!((s->options & SSL_OP_TLS_ROLLBACK_BUG) &&
1832                                 (p[0] == (s->version>>8)) && (p[1] == (s->version & 0xff))))
1833                                 {
1834                                 al=SSL_AD_DECODE_ERROR;
1835                                 /* SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BAD_PROTOCOL_VERSION_NUMBER); */
1836
1837                                 /* The Klima-Pokorny-Rosa extension of Bleichenbacher's attack
1838                                  * (http://eprint.iacr.org/2003/052/) exploits the version
1839                                  * number check as a "bad version oracle" -- an alert would
1840                                  * reveal that the plaintext corresponding to some ciphertext
1841                                  * made up by the adversary is properly formatted except
1842                                  * that the version number is wrong.  To avoid such attacks,
1843                                  * we should treat this just like any other decryption error. */
1844                                 }
1845                         }
1846
1847                 if (al != -1)
1848                         {
1849                         /* Some decryption failure -- use random value instead as countermeasure
1850                          * against Bleichenbacher's attack on PKCS #1 v1.5 RSA padding
1851                          * (see RFC 2246, section 7.4.7.1). */
1852                         ERR_clear_error();
1853                         i = SSL_MAX_MASTER_KEY_LENGTH;
1854                         p[0] = s->client_version >> 8;
1855                         p[1] = s->client_version & 0xff;
1856                         if (RAND_pseudo_bytes(p+2, i-2) <= 0) /* should be RAND_bytes, but we cannot work around a failure */
1857                                 goto err;
1858                         }
1859
1860                 s->session->master_key_length=
1861                         s->method->ssl3_enc->generate_master_secret(s,
1862                                 s->session->master_key,
1863                                 p,i);
1864                 OPENSSL_cleanse(p,i);
1865                 }
1866         else
1867 #endif
1868 #ifndef OPENSSL_NO_DH
1869                 if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
1870                 {
1871                 n2s(p,i);
1872                 if (n != i+2)
1873                         {
1874                         if (!(s->options & SSL_OP_SSLEAY_080_CLIENT_DH_BUG))
1875                                 {
1876                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
1877                                 goto err;
1878                                 }
1879                         else
1880                                 {
1881                                 p-=2;
1882                                 i=(int)n;
1883                                 }
1884                         }
1885
1886                 if (n == 0L) /* the parameters are in the cert */
1887                         {
1888                         al=SSL_AD_HANDSHAKE_FAILURE;
1889                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_DECODE_DH_CERTS);
1890                         goto f_err;
1891                         }
1892                 else
1893                         {
1894                         if (s->s3->tmp.dh == NULL)
1895                                 {
1896                                 al=SSL_AD_HANDSHAKE_FAILURE;
1897                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_DH_KEY);
1898                                 goto f_err;
1899                                 }
1900                         else
1901                                 dh_srvr=s->s3->tmp.dh;
1902                         }
1903
1904                 pub=BN_bin2bn(p,i,NULL);
1905                 if (pub == NULL)
1906                         {
1907                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_BN_LIB);
1908                         goto err;
1909                         }
1910
1911                 i=DH_compute_key(p,pub,dh_srvr);
1912
1913                 if (i <= 0)
1914                         {
1915                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
1916                         goto err;
1917                         }
1918
1919                 DH_free(s->s3->tmp.dh);
1920                 s->s3->tmp.dh=NULL;
1921
1922                 BN_clear_free(pub);
1923                 pub=NULL;
1924                 s->session->master_key_length=
1925                         s->method->ssl3_enc->generate_master_secret(s,
1926                                 s->session->master_key,p,i);
1927                 OPENSSL_cleanse(p,i);
1928                 }
1929         else
1930 #endif
1931 #ifndef OPENSSL_NO_KRB5
1932         if (l & SSL_kKRB5)
1933                 {
1934                 krb5_error_code         krb5rc;
1935                 krb5_data               enc_ticket;
1936                 krb5_data               authenticator;
1937                 krb5_data               enc_pms;
1938                 KSSL_CTX                *kssl_ctx = s->kssl_ctx;
1939                 EVP_CIPHER_CTX          ciph_ctx;
1940                 EVP_CIPHER              *enc = NULL;
1941                 unsigned char           iv[EVP_MAX_IV_LENGTH];
1942                 unsigned char           pms[SSL_MAX_MASTER_KEY_LENGTH
1943                                                + EVP_MAX_BLOCK_LENGTH];
1944                 int                     padl, outl;
1945                 krb5_timestamp          authtime = 0;
1946                 krb5_ticket_times       ttimes;
1947
1948                 EVP_CIPHER_CTX_init(&ciph_ctx);
1949
1950                 if (!kssl_ctx)  kssl_ctx = kssl_ctx_new();
1951
1952                 n2s(p,i);
1953                 enc_ticket.length = i;
1954
1955                 if (n < (int)enc_ticket.length + 6)
1956                         {
1957                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1958                                 SSL_R_DATA_LENGTH_TOO_LONG);
1959                         goto err;
1960                         }
1961
1962                 enc_ticket.data = (char *)p;
1963                 p+=enc_ticket.length;
1964
1965                 n2s(p,i);
1966                 authenticator.length = i;
1967
1968                 if (n < (int)(enc_ticket.length + authenticator.length) + 6)
1969                         {
1970                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1971                                 SSL_R_DATA_LENGTH_TOO_LONG);
1972                         goto err;
1973                         }
1974
1975                 authenticator.data = (char *)p;
1976                 p+=authenticator.length;
1977
1978                 n2s(p,i);
1979                 enc_pms.length = i;
1980                 enc_pms.data = (char *)p;
1981                 p+=enc_pms.length;
1982
1983                 /* Note that the length is checked again below,
1984                 ** after decryption
1985                 */
1986                 if(enc_pms.length > sizeof pms)
1987                         {
1988                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1989                                SSL_R_DATA_LENGTH_TOO_LONG);
1990                         goto err;
1991                         }
1992
1993                 if (n != (long)(enc_ticket.length + authenticator.length +
1994                                                 enc_pms.length + 6))
1995                         {
1996                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
1997                                 SSL_R_DATA_LENGTH_TOO_LONG);
1998                         goto err;
1999                         }
2000
2001                 if ((krb5rc = kssl_sget_tkt(kssl_ctx, &enc_ticket, &ttimes,
2002                                         &kssl_err)) != 0)
2003                         {
2004 #ifdef KSSL_DEBUG
2005                         printf("kssl_sget_tkt rtn %d [%d]\n",
2006                                 krb5rc, kssl_err.reason);
2007                         if (kssl_err.text)
2008                                 printf("kssl_err text= %s\n", kssl_err.text);
2009 #endif  /* KSSL_DEBUG */
2010                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2011                                 kssl_err.reason);
2012                         goto err;
2013                         }
2014
2015                 /*  Note: no authenticator is not considered an error,
2016                 **  but will return authtime == 0.
2017                 */
2018                 if ((krb5rc = kssl_check_authent(kssl_ctx, &authenticator,
2019                                         &authtime, &kssl_err)) != 0)
2020                         {
2021 #ifdef KSSL_DEBUG
2022                         printf("kssl_check_authent rtn %d [%d]\n",
2023                                 krb5rc, kssl_err.reason);
2024                         if (kssl_err.text)
2025                                 printf("kssl_err text= %s\n", kssl_err.text);
2026 #endif  /* KSSL_DEBUG */
2027                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2028                                 kssl_err.reason);
2029                         goto err;
2030                         }
2031
2032                 if ((krb5rc = kssl_validate_times(authtime, &ttimes)) != 0)
2033                         {
2034                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE, krb5rc);
2035                         goto err;
2036                         }
2037
2038 #ifdef KSSL_DEBUG
2039                 kssl_ctx_show(kssl_ctx);
2040 #endif  /* KSSL_DEBUG */
2041
2042                 enc = kssl_map_enc(kssl_ctx->enctype);
2043                 if (enc == NULL)
2044                     goto err;
2045
2046                 memset(iv, 0, sizeof iv);       /* per RFC 1510 */
2047
2048                 if (!EVP_DecryptInit_ex(&ciph_ctx,enc,NULL,kssl_ctx->key,iv))
2049                         {
2050                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2051                                 SSL_R_DECRYPTION_FAILED);
2052                         goto err;
2053                         }
2054                 if (!EVP_DecryptUpdate(&ciph_ctx, pms,&outl,
2055                                         (unsigned char *)enc_pms.data, enc_pms.length))
2056                         {
2057                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2058                                 SSL_R_DECRYPTION_FAILED);
2059                         goto err;
2060                         }
2061                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2062                         {
2063                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2064                                 SSL_R_DATA_LENGTH_TOO_LONG);
2065                         goto err;
2066                         }
2067                 if (!EVP_DecryptFinal_ex(&ciph_ctx,&(pms[outl]),&padl))
2068                         {
2069                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2070                                 SSL_R_DECRYPTION_FAILED);
2071                         goto err;
2072                         }
2073                 outl += padl;
2074                 if (outl > SSL_MAX_MASTER_KEY_LENGTH)
2075                         {
2076                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2077                                 SSL_R_DATA_LENGTH_TOO_LONG);
2078                         goto err;
2079                         }
2080                 if (!((pms[0] == (s->client_version>>8)) && (pms[1] == (s->client_version & 0xff))))
2081                     {
2082                     /* The premaster secret must contain the same version number as the
2083                      * ClientHello to detect version rollback attacks (strangely, the
2084                      * protocol does not offer such protection for DH ciphersuites).
2085                      * However, buggy clients exist that send random bytes instead of
2086                      * the protocol version.
2087                      * If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such clients.
2088                      * (Perhaps we should have a separate BUG value for the Kerberos cipher)
2089                      */
2090                     if (!(s->options & SSL_OP_TLS_ROLLBACK_BUG))
2091                         {
2092                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2093                                SSL_AD_DECODE_ERROR);
2094                         goto err;
2095                         }
2096                     }
2097
2098                 EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2099
2100                 s->session->master_key_length=
2101                         s->method->ssl3_enc->generate_master_secret(s,
2102                                 s->session->master_key, pms, outl);
2103
2104                 if (kssl_ctx->client_princ)
2105                         {
2106                         size_t len = strlen(kssl_ctx->client_princ);
2107                         if ( len < SSL_MAX_KRB5_PRINCIPAL_LENGTH )
2108                                 {
2109                                 s->session->krb5_client_princ_len = len;
2110                                 memcpy(s->session->krb5_client_princ,kssl_ctx->client_princ,len);
2111                                 }
2112                         }
2113
2114
2115                 /*  Was doing kssl_ctx_free() here,
2116                 **  but it caused problems for apache.
2117                 **  kssl_ctx = kssl_ctx_free(kssl_ctx);
2118                 **  if (s->kssl_ctx)  s->kssl_ctx = NULL;
2119                 */
2120                 }
2121         else
2122 #endif  /* OPENSSL_NO_KRB5 */
2123
2124 #ifndef OPENSSL_NO_ECDH
2125                 if ((l & SSL_kECDH) || (l & SSL_kECDHE))
2126                 {
2127                 int ret = 1;
2128                 int field_size = 0;
2129                 const EC_KEY   *tkey;
2130                 const EC_GROUP *group;
2131                 const BIGNUM *priv_key;
2132
2133                 /* initialize structures for server's ECDH key pair */
2134                 if ((srvr_ecdh = EC_KEY_new()) == NULL)
2135                         {
2136                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2137                             ERR_R_MALLOC_FAILURE);
2138                         goto err;
2139                         }
2140
2141                 /* Let's get server private key and group information */
2142                 if (l & SSL_kECDH)
2143                         {
2144                         /* use the certificate */
2145                         tkey = s->cert->pkeys[SSL_PKEY_ECC].privatekey->pkey.ec;
2146                         }
2147                 else
2148                         {
2149                         /* use the ephermeral values we saved when
2150                          * generating the ServerKeyExchange msg.
2151                          */
2152                         tkey = s->s3->tmp.ecdh;
2153                         }
2154
2155                 group    = EC_KEY_get0_group(tkey);
2156                 priv_key = EC_KEY_get0_private_key(tkey);
2157
2158                 if (!EC_KEY_set_group(srvr_ecdh, group) ||
2159                     !EC_KEY_set_private_key(srvr_ecdh, priv_key))
2160                         {
2161                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2162                                ERR_R_EC_LIB);
2163                         goto err;
2164                         }
2165
2166                 /* Let's get client's public key */
2167                 if ((clnt_ecpoint = EC_POINT_new(group)) == NULL)
2168                         {
2169                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2170                             ERR_R_MALLOC_FAILURE);
2171                         goto err;
2172                         }
2173
2174                 if (n == 0L)
2175                         {
2176                         /* Client Publickey was in Client Certificate */
2177
2178                          if (l & SSL_kECDHE)
2179                                  {
2180                                  al=SSL_AD_HANDSHAKE_FAILURE;
2181                                  SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,SSL_R_MISSING_TMP_ECDH_KEY);
2182                                  goto f_err;
2183                                  }
2184                         if (((clnt_pub_pkey=X509_get_pubkey(s->session->peer))
2185                             == NULL) ||
2186                             (clnt_pub_pkey->type != EVP_PKEY_EC))
2187                                 {
2188                                 /* XXX: For now, we do not support client
2189                                  * authentication using ECDH certificates
2190                                  * so this branch (n == 0L) of the code is
2191                                  * never executed. When that support is
2192                                  * added, we ought to ensure the key
2193                                  * received in the certificate is
2194                                  * authorized for key agreement.
2195                                  * ECDH_compute_key implicitly checks that
2196                                  * the two ECDH shares are for the same
2197                                  * group.
2198                                  */
2199                                 al=SSL_AD_HANDSHAKE_FAILURE;
2200                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2201                                     SSL_R_UNABLE_TO_DECODE_ECDH_CERTS);
2202                                 goto f_err;
2203                                 }
2204
2205                         if (EC_POINT_copy(clnt_ecpoint,
2206                             EC_KEY_get0_public_key(clnt_pub_pkey->pkey.ec)) == 0)
2207                                 {
2208                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2209                                         ERR_R_EC_LIB);
2210                                 goto err;
2211                                 }
2212                         ret = 2; /* Skip certificate verify processing */
2213                         }
2214                 else
2215                         {
2216                         /* Get client's public key from encoded point
2217                          * in the ClientKeyExchange message.
2218                          */
2219                         if ((bn_ctx = BN_CTX_new()) == NULL)
2220                                 {
2221                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2222                                     ERR_R_MALLOC_FAILURE);
2223                                 goto err;
2224                                 }
2225
2226                         /* Get encoded point length */
2227                         i = *p;
2228                         p += 1;
2229                         if (EC_POINT_oct2point(group,
2230                             clnt_ecpoint, p, i, bn_ctx) == 0)
2231                                 {
2232                                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2233                                     ERR_R_EC_LIB);
2234                                 goto err;
2235                                 }
2236                         /* p is pointing to somewhere in the buffer
2237                          * currently, so set it to the start
2238                          */
2239                         p=(unsigned char *)s->init_buf->data;
2240                         }
2241
2242                 /* Compute the shared pre-master secret */
2243                 field_size = EC_GROUP_get_degree(group);
2244                 if (field_size <= 0)
2245                         {
2246                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2247                                ERR_R_ECDH_LIB);
2248                         goto err;
2249                         }
2250                 i = ECDH_compute_key(p, (field_size+7)/8, clnt_ecpoint, srvr_ecdh, NULL);
2251                 if (i <= 0)
2252                         {
2253                         SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2254                             ERR_R_ECDH_LIB);
2255                         goto err;
2256                         }
2257
2258                 EVP_PKEY_free(clnt_pub_pkey);
2259                 EC_POINT_free(clnt_ecpoint);
2260                 if (srvr_ecdh != NULL)
2261                         EC_KEY_free(srvr_ecdh);
2262                 BN_CTX_free(bn_ctx);
2263
2264                 /* Compute the master secret */
2265                 s->session->master_key_length = s->method->ssl3_enc-> \
2266                     generate_master_secret(s, s->session->master_key, p, i);
2267
2268                 OPENSSL_cleanse(p, i);
2269                 return (ret);
2270                 }
2271         else
2272 #endif
2273                 {
2274                 al=SSL_AD_HANDSHAKE_FAILURE;
2275                 SSLerr(SSL_F_SSL3_GET_CLIENT_KEY_EXCHANGE,
2276                                 SSL_R_UNKNOWN_CIPHER_TYPE);
2277                 goto f_err;
2278                 }
2279
2280         return(1);
2281 f_err:
2282         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2283 #if !defined(OPENSSL_NO_DH) || !defined(OPENSSL_NO_RSA) || !defined(OPENSSL_NO_ECDH)
2284 err:
2285 #endif
2286 #ifndef OPENSSL_NO_ECDH
2287         EVP_PKEY_free(clnt_pub_pkey);
2288         EC_POINT_free(clnt_ecpoint);
2289         if (srvr_ecdh != NULL)
2290                 EC_KEY_free(srvr_ecdh);
2291         BN_CTX_free(bn_ctx);
2292 #endif
2293         return(-1);
2294         }
2295
2296 int ssl3_get_cert_verify(SSL *s)
2297         {
2298         EVP_PKEY *pkey=NULL;
2299         unsigned char *p;
2300         int al,ok,ret=0;
2301         long n;
2302         int type=0,i,j;
2303         X509 *peer;
2304
2305         n=s->method->ssl_get_message(s,
2306                 SSL3_ST_SR_CERT_VRFY_A,
2307                 SSL3_ST_SR_CERT_VRFY_B,
2308                 -1,
2309                 514, /* 514? */
2310                 &ok);
2311
2312         if (!ok) return((int)n);
2313
2314         if (s->session->peer != NULL)
2315                 {
2316                 peer=s->session->peer;
2317                 pkey=X509_get_pubkey(peer);
2318                 type=X509_certificate_type(peer,pkey);
2319                 }
2320         else
2321                 {
2322                 peer=NULL;
2323                 pkey=NULL;
2324                 }
2325
2326         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_VERIFY)
2327                 {
2328                 s->s3->tmp.reuse_message=1;
2329                 if ((peer != NULL) && (type | EVP_PKT_SIGN))
2330                         {
2331                         al=SSL_AD_UNEXPECTED_MESSAGE;
2332                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_MISSING_VERIFY_MESSAGE);
2333                         goto f_err;
2334                         }
2335                 ret=1;
2336                 goto end;
2337                 }
2338
2339         if (peer == NULL)
2340                 {
2341                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_NO_CLIENT_CERT_RECEIVED);
2342                 al=SSL_AD_UNEXPECTED_MESSAGE;
2343                 goto f_err;
2344                 }
2345
2346         if (!(type & EVP_PKT_SIGN))
2347                 {
2348                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
2349                 al=SSL_AD_ILLEGAL_PARAMETER;
2350                 goto f_err;
2351                 }
2352
2353         if (s->s3->change_cipher_spec)
2354                 {
2355                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_CCS_RECEIVED_EARLY);
2356                 al=SSL_AD_UNEXPECTED_MESSAGE;
2357                 goto f_err;
2358                 }
2359
2360         /* we now have a signature that we need to verify */
2361         p=(unsigned char *)s->init_msg;
2362         n2s(p,i);
2363         n-=2;
2364         if (i > n)
2365                 {
2366                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_LENGTH_MISMATCH);
2367                 al=SSL_AD_DECODE_ERROR;
2368                 goto f_err;
2369                 }
2370
2371         j=EVP_PKEY_size(pkey);
2372         if ((i > j) || (n > j) || (n <= 0))
2373                 {
2374                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_WRONG_SIGNATURE_SIZE);
2375                 al=SSL_AD_DECODE_ERROR;
2376                 goto f_err;
2377                 }
2378
2379 #ifndef OPENSSL_NO_RSA
2380         if (pkey->type == EVP_PKEY_RSA)
2381                 {
2382                 i=RSA_verify(NID_md5_sha1, s->s3->tmp.cert_verify_md,
2383                         MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH, p, i,
2384                                                         pkey->pkey.rsa);
2385                 if (i < 0)
2386                         {
2387                         al=SSL_AD_DECRYPT_ERROR;
2388                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_DECRYPT);
2389                         goto f_err;
2390                         }
2391                 if (i == 0)
2392                         {
2393                         al=SSL_AD_DECRYPT_ERROR;
2394                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_RSA_SIGNATURE);
2395                         goto f_err;
2396                         }
2397                 }
2398         else
2399 #endif
2400 #ifndef OPENSSL_NO_DSA
2401                 if (pkey->type == EVP_PKEY_DSA)
2402                 {
2403                 j=DSA_verify(pkey->save_type,
2404                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2405                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.dsa);
2406                 if (j <= 0)
2407                         {
2408                         /* bad signature */
2409                         al=SSL_AD_DECRYPT_ERROR;
2410                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,SSL_R_BAD_DSA_SIGNATURE);
2411                         goto f_err;
2412                         }
2413                 }
2414         else
2415 #endif
2416 #ifndef OPENSSL_NO_ECDSA
2417                 if (pkey->type == EVP_PKEY_EC)
2418                 {
2419                 j=ECDSA_verify(pkey->save_type,
2420                         &(s->s3->tmp.cert_verify_md[MD5_DIGEST_LENGTH]),
2421                         SHA_DIGEST_LENGTH,p,i,pkey->pkey.ec);
2422                 if (j <= 0)
2423                         {
2424                         /* bad signature */
2425                         al=SSL_AD_DECRYPT_ERROR;
2426                         SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,
2427                             SSL_R_BAD_ECDSA_SIGNATURE);
2428                         goto f_err;
2429                         }
2430                 }
2431         else
2432 #endif
2433                 {
2434                 SSLerr(SSL_F_SSL3_GET_CERT_VERIFY,ERR_R_INTERNAL_ERROR);
2435                 al=SSL_AD_UNSUPPORTED_CERTIFICATE;
2436                 goto f_err;
2437                 }
2438
2439
2440         ret=1;
2441         if (0)
2442                 {
2443 f_err:
2444                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2445                 }
2446 end:
2447         EVP_PKEY_free(pkey);
2448         return(ret);
2449         }
2450
2451 int ssl3_get_client_certificate(SSL *s)
2452         {
2453         int i,ok,al,ret= -1;
2454         X509 *x=NULL;
2455         unsigned long l,nc,llen,n;
2456         const unsigned char *p,*q;
2457         unsigned char *d;
2458         STACK_OF(X509) *sk=NULL;
2459
2460         n=s->method->ssl_get_message(s,
2461                 SSL3_ST_SR_CERT_A,
2462                 SSL3_ST_SR_CERT_B,
2463                 -1,
2464                 s->max_cert_list,
2465                 &ok);
2466
2467         if (!ok) return((int)n);
2468
2469         if      (s->s3->tmp.message_type == SSL3_MT_CLIENT_KEY_EXCHANGE)
2470                 {
2471                 if (    (s->verify_mode & SSL_VERIFY_PEER) &&
2472                         (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2473                         {
2474                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2475                         al=SSL_AD_HANDSHAKE_FAILURE;
2476                         goto f_err;
2477                         }
2478                 /* If tls asked for a client cert, the client must return a 0 list */
2479                 if ((s->version > SSL3_VERSION) && s->s3->tmp.cert_request)
2480                         {
2481                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_TLS_PEER_DID_NOT_RESPOND_WITH_CERTIFICATE_LIST);
2482                         al=SSL_AD_UNEXPECTED_MESSAGE;
2483                         goto f_err;
2484                         }
2485                 s->s3->tmp.reuse_message=1;
2486                 return(1);
2487                 }
2488
2489         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
2490                 {
2491                 al=SSL_AD_UNEXPECTED_MESSAGE;
2492                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_WRONG_MESSAGE_TYPE);
2493                 goto f_err;
2494                 }
2495         p=d=(unsigned char *)s->init_msg;
2496
2497         if ((sk=sk_X509_new_null()) == NULL)
2498                 {
2499                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2500                 goto err;
2501                 }
2502
2503         n2l3(p,llen);
2504         if (llen+3 != n)
2505                 {
2506                 al=SSL_AD_DECODE_ERROR;
2507                 SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
2508                 goto f_err;
2509                 }
2510         for (nc=0; nc<llen; )
2511                 {
2512                 n2l3(p,l);
2513                 if ((l+nc+3) > llen)
2514                         {
2515                         al=SSL_AD_DECODE_ERROR;
2516                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2517                         goto f_err;
2518                         }
2519
2520                 q=p;
2521                 x=d2i_X509(NULL,&p,l);
2522                 if (x == NULL)
2523                         {
2524                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_ASN1_LIB);
2525                         goto err;
2526                         }
2527                 if (p != (q+l))
2528                         {
2529                         al=SSL_AD_DECODE_ERROR;
2530                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
2531                         goto f_err;
2532                         }
2533                 if (!sk_X509_push(sk,x))
2534                         {
2535                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,ERR_R_MALLOC_FAILURE);
2536                         goto err;
2537                         }
2538                 x=NULL;
2539                 nc+=l+3;
2540                 }
2541
2542         if (sk_X509_num(sk) <= 0)
2543                 {
2544                 /* TLS does not mind 0 certs returned */
2545                 if (s->version == SSL3_VERSION)
2546                         {
2547                         al=SSL_AD_HANDSHAKE_FAILURE;
2548                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATES_RETURNED);
2549                         goto f_err;
2550                         }
2551                 /* Fail for TLS only if we required a certificate */
2552                 else if ((s->verify_mode & SSL_VERIFY_PEER) &&
2553                          (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
2554                         {
2555                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
2556                         al=SSL_AD_HANDSHAKE_FAILURE;
2557                         goto f_err;
2558                         }
2559                 }
2560         else
2561                 {
2562                 i=ssl_verify_cert_chain(s,sk);
2563                 if (!i)
2564                         {
2565                         al=ssl_verify_alarm_type(s->verify_result);
2566                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE,SSL_R_NO_CERTIFICATE_RETURNED);
2567                         goto f_err;
2568                         }
2569                 }
2570
2571         if (s->session->peer != NULL) /* This should not be needed */
2572                 X509_free(s->session->peer);
2573         s->session->peer=sk_X509_shift(sk);
2574         s->session->verify_result = s->verify_result;
2575
2576         /* With the current implementation, sess_cert will always be NULL
2577          * when we arrive here. */
2578         if (s->session->sess_cert == NULL)
2579                 {
2580                 s->session->sess_cert = ssl_sess_cert_new();
2581                 if (s->session->sess_cert == NULL)
2582                         {
2583                         SSLerr(SSL_F_SSL3_GET_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
2584                         goto err;
2585                         }
2586                 }
2587         if (s->session->sess_cert->cert_chain != NULL)
2588                 sk_X509_pop_free(s->session->sess_cert->cert_chain, X509_free);
2589         s->session->sess_cert->cert_chain=sk;
2590         /* Inconsistency alert: cert_chain does *not* include the
2591          * peer's own certificate, while we do include it in s3_clnt.c */
2592
2593         sk=NULL;
2594
2595         ret=1;
2596         if (0)
2597                 {
2598 f_err:
2599                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
2600                 }
2601 err:
2602         if (x != NULL) X509_free(x);
2603         if (sk != NULL) sk_X509_pop_free(sk,X509_free);
2604         return(ret);
2605         }
2606
2607 int ssl3_send_server_certificate(SSL *s)
2608         {
2609         unsigned long l;
2610         X509 *x;
2611
2612         if (s->state == SSL3_ST_SW_CERT_A)
2613                 {
2614                 x=ssl_get_server_send_cert(s);
2615                 if (x == NULL &&
2616                         /* VRS: allow null cert if auth == KRB5 */
2617                         (s->s3->tmp.new_cipher->algorithms
2618                                 & (SSL_MKEY_MASK|SSL_AUTH_MASK))
2619                         != (SSL_aKRB5|SSL_kKRB5))
2620                         {
2621                         SSLerr(SSL_F_SSL3_SEND_SERVER_CERTIFICATE,ERR_R_INTERNAL_ERROR);
2622                         return(0);
2623                         }
2624
2625                 l=ssl3_output_cert_chain(s,x);
2626                 s->state=SSL3_ST_SW_CERT_B;
2627                 s->init_num=(int)l;
2628                 s->init_off=0;
2629                 }
2630
2631         /* SSL3_ST_SW_CERT_B */
2632         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2633         }
2634
2635
2636 #ifndef OPENSSL_NO_ECDH
2637 /* This is the complement of curve_id2nid in s3_clnt.c. */
2638 static int nid2curve_id(int nid)
2639 {
2640         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2641          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2642         switch (nid) {
2643         case NID_sect163k1: /* sect163k1 (1) */
2644                 return 1;
2645         case NID_sect163r1: /* sect163r1 (2) */
2646                 return 2;
2647         case NID_sect163r2: /* sect163r2 (3) */
2648                 return 3;
2649         case NID_sect193r1: /* sect193r1 (4) */
2650                 return 4;
2651         case NID_sect193r2: /* sect193r2 (5) */
2652                 return 5;
2653         case NID_sect233k1: /* sect233k1 (6) */
2654                 return 6;
2655         case NID_sect233r1: /* sect233r1 (7) */
2656                 return 7;
2657         case NID_sect239k1: /* sect239k1 (8) */
2658                 return 8;
2659         case NID_sect283k1: /* sect283k1 (9) */
2660                 return 9;
2661         case NID_sect283r1: /* sect283r1 (10) */
2662                 return 10;
2663         case NID_sect409k1: /* sect409k1 (11) */
2664                 return 11;
2665         case NID_sect409r1: /* sect409r1 (12) */
2666                 return 12;
2667         case NID_sect571k1: /* sect571k1 (13) */
2668                 return 13;
2669         case NID_sect571r1: /* sect571r1 (14) */
2670                 return 14;
2671         case NID_secp160k1: /* secp160k1 (15) */
2672                 return 15;
2673         case NID_secp160r1: /* secp160r1 (16) */
2674                 return 16;
2675         case NID_secp160r2: /* secp160r2 (17) */
2676                 return 17;
2677         case NID_secp192k1: /* secp192k1 (18) */
2678                 return 18;
2679         case NID_X9_62_prime192v1: /* secp192r1 (19) */
2680                 return 19;
2681         case NID_secp224k1: /* secp224k1 (20) */
2682                 return 20;
2683         case NID_secp224r1: /* secp224r1 (21) */
2684                 return 21;
2685         case NID_secp256k1: /* secp256k1 (22) */
2686                 return 22;
2687         case NID_X9_62_prime256v1: /* secp256r1 (23) */
2688                 return 23;
2689         case NID_secp384r1: /* secp384r1 (24) */
2690                 return 24;
2691         case NID_secp521r1:  /* secp521r1 (25) */
2692                 return 25;
2693         default:
2694                 return 0;
2695         }
2696 }
2697 #endif
2698 #ifndef OPENSSL_NO_TLSEXT
2699 int ssl3_send_newsession_ticket(SSL *s)
2700         {
2701         if (s->state == SSL3_ST_SW_SESSION_TICKET_A)
2702                 {
2703                 unsigned char *p, *senc, *macstart;
2704                 int len, slen;
2705                 unsigned int hlen;
2706                 EVP_CIPHER_CTX ctx;
2707                 HMAC_CTX hctx;
2708                 unsigned char iv[EVP_MAX_IV_LENGTH];
2709                 unsigned char key_name[16];
2710
2711                 /* get session encoding length */
2712                 slen = i2d_SSL_SESSION(s->session, NULL);
2713                 /* Some length values are 16 bits, so forget it if session is
2714                  * too long
2715                  */
2716                 if (slen > 0xFF00)
2717                         return -1;
2718                 /* Grow buffer if need be: the length calculation is as
2719                  * follows 1 (size of message name) + 3 (message length
2720                  * bytes) + 4 (ticket lifetime hint) + 2 (ticket length) +
2721                  * 16 (key name) + max_iv_len (iv length) +
2722                  * session_length + max_enc_block_size (max encrypted session
2723                  * length) + max_md_size (HMAC).
2724                  */
2725                 if (!BUF_MEM_grow(s->init_buf,
2726                         26 + EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
2727                         EVP_MAX_MD_SIZE + slen))
2728                         return -1;
2729                 senc = OPENSSL_malloc(slen);
2730                 if (!senc)
2731                         return -1;
2732                 p = senc;
2733                 i2d_SSL_SESSION(s->session, &p);
2734
2735                 p=(unsigned char *)s->init_buf->data;
2736                 /* do the header */
2737                 *(p++)=SSL3_MT_NEWSESSION_TICKET;
2738                 /* Skip message length for now */
2739                 p += 3;
2740                 EVP_CIPHER_CTX_init(&ctx);
2741                 HMAC_CTX_init(&hctx);
2742                 /* Initialize HMAC and cipher contexts. If callback present
2743                  * it does all the work otherwise use generated values
2744                  * from parent ctx.
2745                  */
2746                 if (s->ctx->tlsext_ticket_key_cb)
2747                         {
2748                         if (s->ctx->tlsext_ticket_key_cb(s, key_name, iv, &ctx,
2749                                                          &hctx, 1) < 0)
2750                                 {
2751                                 OPENSSL_free(senc);
2752                                 return -1;
2753                                 }
2754                         }
2755                 else
2756                         {
2757                         RAND_pseudo_bytes(iv, 16);
2758                         EVP_EncryptInit_ex(&ctx, EVP_aes_128_cbc(), NULL,
2759                                         s->ctx->tlsext_tick_aes_key, iv);
2760                         HMAC_Init_ex(&hctx, s->ctx->tlsext_tick_hmac_key, 16,
2761                                         tlsext_tick_md(), NULL);
2762                         memcpy(key_name, s->ctx->tlsext_tick_key_name, 16);
2763                         }
2764                 l2n(s->session->tlsext_tick_lifetime_hint, p);
2765                 /* Skip ticket length for now */
2766                 p += 2;
2767                 /* Output key name */
2768                 macstart = p;
2769                 memcpy(p, key_name, 16);
2770                 p += 16;
2771                 /* output IV */
2772                 memcpy(p, iv, EVP_CIPHER_CTX_iv_length(&ctx));
2773                 p += EVP_CIPHER_CTX_iv_length(&ctx);
2774                 /* Encrypt session data */
2775                 EVP_EncryptUpdate(&ctx, p, &len, senc, slen);
2776                 p += len;
2777                 EVP_EncryptFinal(&ctx, p, &len);
2778                 p += len;
2779                 EVP_CIPHER_CTX_cleanup(&ctx);
2780
2781                 HMAC_Update(&hctx, macstart, p - macstart);
2782                 HMAC_Final(&hctx, p, &hlen);
2783                 HMAC_CTX_cleanup(&hctx);
2784
2785                 p += hlen;
2786                 /* Now write out lengths: p points to end of data written */
2787                 /* Total length */
2788                 len = p - (unsigned char *)s->init_buf->data;
2789                 p=(unsigned char *)s->init_buf->data + 1;
2790                 l2n3(len - 4, p); /* Message length */
2791                 p += 4;
2792                 s2n(len - 10, p);  /* Ticket length */
2793
2794                 /* number of bytes to write */
2795                 s->init_num= len;
2796                 s->state=SSL3_ST_SW_SESSION_TICKET_B;
2797                 s->init_off=0;
2798                 OPENSSL_free(senc);
2799                 }
2800
2801         /* SSL3_ST_SW_SESSION_TICKET_B */
2802         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2803         }
2804
2805 int ssl3_send_cert_status(SSL *s)
2806         {
2807         if (s->state == SSL3_ST_SW_CERT_STATUS_A)
2808                 {
2809                 unsigned char *p;
2810                 /* Grow buffer if need be: the length calculation is as
2811                  * follows 1 (message type) + 3 (message length) +
2812                  * 1 (ocsp response type) + 3 (ocsp response length)
2813                  * + (ocsp response)
2814                  */
2815                 if (!BUF_MEM_grow(s->init_buf, 8 + s->tlsext_ocsp_resplen))
2816                         return -1;
2817
2818                 p=(unsigned char *)s->init_buf->data;
2819
2820                 /* do the header */
2821                 *(p++)=SSL3_MT_CERTIFICATE_STATUS;
2822                 /* message length */
2823                 l2n3(s->tlsext_ocsp_resplen + 4, p);
2824                 /* status type */
2825                 *(p++)= s->tlsext_status_type;
2826                 /* length of OCSP response */
2827                 l2n3(s->tlsext_ocsp_resplen, p);
2828                 /* actual response */
2829                 memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
2830                 /* number of bytes to write */
2831                 s->init_num = 8 + s->tlsext_ocsp_resplen;
2832                 s->state=SSL3_ST_SW_CERT_STATUS_B;
2833                 s->init_off = 0;
2834                 }
2835
2836         /* SSL3_ST_SW_CERT_STATUS_B */
2837         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2838         }
2839 #endif