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