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