ssl/s3_clnt.c

   1 /* ssl/s3_clnt.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) 1998-2007 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  * Copyright 2005 Nokia. All rights reserved.
 126  *
 127  * The portions of the attached software ("Contribution") is developed by
 128  * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 129  * license.
 130  *
 131  * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 132  * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 133  * support (see RFC 4279) to OpenSSL.
 134  *
 135  * No patent licenses or other rights except those expressly stated in
 136  * the OpenSSL open source license shall be deemed granted or received
 137  * expressly, by implication, estoppel, or otherwise.
 138  *
 139  * No assurances are provided by Nokia that the Contribution does not
 140  * infringe the patent or other intellectual property rights of any third
 141  * party or that the license provides you with all the necessary rights
 142  * to make use of the Contribution.
 143  *
 144  * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 145  * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 146  * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 147  * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 148  * OTHERWISE.
 149  */
 150
 151 #include <stdio.h>
 152 #include "ssl_locl.h"
 153 #include "kssl_lcl.h"
 154 #include <openssl/buffer.h>
 155 #include <openssl/rand.h>
 156 #include <openssl/objects.h>
 157 #include <openssl/evp.h>
 158 #include <openssl/md5.h>
 159 #ifndef OPENSSL_NO_DH
 160 #include <openssl/dh.h>
 161 #endif
 162 #include <openssl/bn.h>
 163 #ifndef OPENSSL_NO_ENGINE
 164 #include <openssl/engine.h>
 165 #endif
 166
 167 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 168
 169 #ifndef OPENSSL_NO_SSL3_METHOD
 170 static const SSL_METHOD *ssl3_get_client_method(int ver)
 171         {
 172         if (ver == SSL3_VERSION)
 173                 return(SSLv3_client_method());
 174         else
 175                 return(NULL);
 176         }
 177
 178 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 179                         ssl_undefined_function,
 180                         ssl3_connect,
 181                         ssl3_get_client_method)
 182 #endif
 183
 184 int ssl3_connect(SSL *s)
 185         {
 186         BUF_MEM *buf=NULL;
 187         unsigned long Time=(unsigned long)time(NULL);
 188         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 189         int ret= -1;
 190         int new_state,state,skip=0;
 191
 192         RAND_add(&Time,sizeof(Time),0);
 193         ERR_clear_error();
 194         clear_sys_error();
 195
 196         if (s->info_callback != NULL)
 197                 cb=s->info_callback;
 198         else if (s->ctx->info_callback != NULL)
 199                 cb=s->ctx->info_callback;
 200
 201         s->in_handshake++;
 202         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 203
 204 #ifndef OPENSSL_NO_HEARTBEATS
 205         /* If we're awaiting a HeartbeatResponse, pretend we
 206          * already got and don't await it anymore, because
 207          * Heartbeats don't make sense during handshakes anyway.
 208          */
 209         if (s->tlsext_hb_pending)
 210                 {
 211                 s->tlsext_hb_pending = 0;
 212                 s->tlsext_hb_seq++;
 213                 }
 214 #endif
 215
 216         for (;;)
 217                 {
 218                 state=s->state;
 219
 220                 switch(s->state)
 221                         {
 222                 case SSL_ST_RENEGOTIATE:
 223                         s->renegotiate=1;
 224                         s->state=SSL_ST_CONNECT;
 225                         s->ctx->stats.sess_connect_renegotiate++;
 226                         /* break */
 227                 case SSL_ST_BEFORE:
 228                 case SSL_ST_CONNECT:
 229                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 230                 case SSL_ST_OK|SSL_ST_CONNECT:
 231
 232                         s->server=0;
 233                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 234
 235                         if ((s->version & 0xff00 ) != 0x0300)
 236                                 {
 237                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 238                                 ret = -1;
 239                                 goto end;
 240                                 }
 241
 242                         if (!ssl_security(s, SSL_SECOP_VERSION, 0,
 243                                                         s->version, NULL))
 244                                 {
 245                                 SSLerr(SSL_F_SSL3_CONNECT, SSL_R_VERSION_TOO_LOW);
 246                                 return -1;
 247                                 }
 248
 249                         /* s->version=SSL3_VERSION; */
 250                         s->type=SSL_ST_CONNECT;
 251
 252                         if (s->init_buf == NULL)
 253                                 {
 254                                 if ((buf=BUF_MEM_new()) == NULL)
 255                                         {
 256                                         ret= -1;
 257                                         goto end;
 258                                         }
 259                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 260                                         {
 261                                         ret= -1;
 262                                         goto end;
 263                                         }
 264                                 s->init_buf=buf;
 265                                 buf=NULL;
 266                                 }
 267
 268                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 269
 270                         /* setup buffing BIO */
 271                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 272
 273                         /* don't push the buffering BIO quite yet */
 274
 275                         ssl3_init_finished_mac(s);
 276
 277                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 278                         s->ctx->stats.sess_connect++;
 279                         s->init_num=0;
 280                         s->s3->flags &= ~SSL3_FLAGS_CCS_OK;
 281                         /* Should have been reset by ssl3_get_finished, too. */
 282                         s->s3->change_cipher_spec = 0;
 283                         break;
 284
 285                 case SSL3_ST_CW_CLNT_HELLO_A:
 286                 case SSL3_ST_CW_CLNT_HELLO_B:
 287
 288                         s->shutdown=0;
 289                         ret=ssl3_client_hello(s);
 290                         if (ret <= 0) goto end;
 291                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 292                         s->init_num=0;
 293
 294                         /* turn on buffering for the next lot of output */
 295                         if (s->bbio != s->wbio)
 296                                 s->wbio=BIO_push(s->bbio,s->wbio);
 297
 298                         break;
 299
 300                 case SSL3_ST_CR_SRVR_HELLO_A:
 301                 case SSL3_ST_CR_SRVR_HELLO_B:
 302                         ret=ssl3_get_server_hello(s);
 303                         if (ret <= 0) goto end;
 304
 305                         if (s->hit)
 306                                 {
 307                                 s->state=SSL3_ST_CR_FINISHED_A;
 308 #ifndef OPENSSL_NO_TLSEXT
 309                                 if (s->tlsext_ticket_expected)
 310                                         {
 311                                         /* receive renewed session ticket */
 312                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 313                                         }
 314 #endif
 315                                 }
 316                         else
 317                                 {
 318                                         s->state=SSL3_ST_CR_CERT_A;
 319                                 }
 320                         s->init_num=0;
 321                         break;
 322                 case SSL3_ST_CR_CERT_A:
 323                 case SSL3_ST_CR_CERT_B:
 324                         /* Check if it is anon DH/ECDH, SRP auth */
 325                         /* or PSK */
 326                         if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP)) &&
 327                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 328                                 {
 329                                 ret=ssl3_get_server_certificate(s);
 330                                 if (ret <= 0) goto end;
 331 #ifndef OPENSSL_NO_TLSEXT
 332                                 if (s->tlsext_status_expected)
 333                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 334                                 else
 335                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 336                                 }
 337                         else
 338                                 {
 339                                 skip = 1;
 340                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 341                                 }
 342 #else
 343                                 }
 344                         else
 345                                 skip=1;
 346
 347                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 348 #endif
 349                         s->init_num=0;
 350                         break;
 351
 352                 case SSL3_ST_CR_KEY_EXCH_A:
 353                 case SSL3_ST_CR_KEY_EXCH_B:
 354                         ret=ssl3_get_key_exchange(s);
 355                         if (ret <= 0) goto end;
 356                         s->state=SSL3_ST_CR_CERT_REQ_A;
 357                         s->init_num=0;
 358
 359                         /* at this point we check that we have the
 360                          * required stuff from the server */
 361                         if (!ssl3_check_cert_and_algorithm(s))
 362                                 {
 363                                 ret= -1;
 364                                 goto end;
 365                                 }
 366                         break;
 367
 368                 case SSL3_ST_CR_CERT_REQ_A:
 369                 case SSL3_ST_CR_CERT_REQ_B:
 370                         ret=ssl3_get_certificate_request(s);
 371                         if (ret <= 0) goto end;
 372                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 373                         s->init_num=0;
 374                         break;
 375
 376                 case SSL3_ST_CR_SRVR_DONE_A:
 377                 case SSL3_ST_CR_SRVR_DONE_B:
 378                         ret=ssl3_get_server_done(s);
 379                         if (ret <= 0) goto end;
 380 #ifndef OPENSSL_NO_SRP
 381                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
 382                                 {
 383                                 if ((ret = SRP_Calc_A_param(s))<=0)
 384                                         {
 385                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
 386                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
 387                                         goto end;
 388                                         }
 389                                 }
 390 #endif
 391                         if (s->s3->tmp.cert_req)
 392                                 s->state=SSL3_ST_CW_CERT_A;
 393                         else
 394                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 395                         s->init_num=0;
 396
 397                         break;
 398
 399                 case SSL3_ST_CW_CERT_A:
 400                 case SSL3_ST_CW_CERT_B:
 401                 case SSL3_ST_CW_CERT_C:
 402                 case SSL3_ST_CW_CERT_D:
 403                         ret=ssl3_send_client_certificate(s);
 404                         if (ret <= 0) goto end;
 405                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 406                         s->init_num=0;
 407                         break;
 408
 409                 case SSL3_ST_CW_KEY_EXCH_A:
 410                 case SSL3_ST_CW_KEY_EXCH_B:
 411                         ret=ssl3_send_client_key_exchange(s);
 412                         if (ret <= 0) goto end;
 413                         /* EAY EAY EAY need to check for DH fix cert
 414                          * sent back */
 415                         /* For TLS, cert_req is set to 2, so a cert chain
 416                          * of nothing is sent, but no verify packet is sent */
 417                         /* XXX: For now, we do not support client
 418                          * authentication in ECDH cipher suites with
 419                          * ECDH (rather than ECDSA) certificates.
 420                          * We need to skip the certificate verify
 421                          * message when client's ECDH public key is sent
 422                          * inside the client certificate.
 423                          */
 424                         if (s->s3->tmp.cert_req == 1)
 425                                 {
 426                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 427                                 }
 428                         else
 429                                 {
 430                                 s->state=SSL3_ST_CW_CHANGE_A;
 431                                 }
 432                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 433                                 {
 434                                 s->state=SSL3_ST_CW_CHANGE_A;
 435                                 }
 436
 437                         s->init_num=0;
 438                         break;
 439
 440                 case SSL3_ST_CW_CERT_VRFY_A:
 441                 case SSL3_ST_CW_CERT_VRFY_B:
 442                         ret=ssl3_send_client_verify(s);
 443                         if (ret <= 0) goto end;
 444                         s->state=SSL3_ST_CW_CHANGE_A;
 445                         s->init_num=0;
 446                         break;
 447
 448                 case SSL3_ST_CW_CHANGE_A:
 449                 case SSL3_ST_CW_CHANGE_B:
 450                         ret=ssl3_send_change_cipher_spec(s,
 451                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 452                         if (ret <= 0) goto end;
 453
 454 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 455                         s->state=SSL3_ST_CW_FINISHED_A;
 456 #else
 457                         if (s->s3->next_proto_neg_seen)
 458                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
 459                         else
 460                                 s->state=SSL3_ST_CW_FINISHED_A;
 461 #endif
 462                         s->init_num=0;
 463
 464                         s->session->cipher=s->s3->tmp.new_cipher;
 465 #ifdef OPENSSL_NO_COMP
 466                         s->session->compress_meth=0;
 467 #else
 468                         if (s->s3->tmp.new_compression == NULL)
 469                                 s->session->compress_meth=0;
 470                         else
 471                                 s->session->compress_meth=
 472                                         s->s3->tmp.new_compression->id;
 473 #endif
 474                         if (!s->method->ssl3_enc->setup_key_block(s))
 475                                 {
 476                                 ret= -1;
 477                                 goto end;
 478                                 }
 479
 480                         if (!s->method->ssl3_enc->change_cipher_state(s,
 481                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 482                                 {
 483                                 ret= -1;
 484                                 goto end;
 485                                 }
 486
 487                         break;
 488
 489 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 490                 case SSL3_ST_CW_NEXT_PROTO_A:
 491                 case SSL3_ST_CW_NEXT_PROTO_B:
 492                         ret=ssl3_send_next_proto(s);
 493                         if (ret <= 0) goto end;
 494                         s->state=SSL3_ST_CW_FINISHED_A;
 495                         break;
 496 #endif
 497
 498                 case SSL3_ST_CW_FINISHED_A:
 499                 case SSL3_ST_CW_FINISHED_B:
 500                         ret=ssl3_send_finished(s,
 501                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 502                                 s->method->ssl3_enc->client_finished_label,
 503                                 s->method->ssl3_enc->client_finished_label_len);
 504                         if (ret <= 0) goto end;
 505                         s->state=SSL3_ST_CW_FLUSH;
 506
 507                         /* clear flags */
 508                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 509                         if (s->hit)
 510                                 {
 511                                 s->s3->tmp.next_state=SSL_ST_OK;
 512                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 513                                         {
 514                                         s->state=SSL_ST_OK;
 515                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 516                                         s->s3->delay_buf_pop_ret=0;
 517                                         }
 518                                 }
 519                         else
 520                                 {
 521 #ifndef OPENSSL_NO_TLSEXT
 522                                 /* Allow NewSessionTicket if ticket expected */
 523                                 if (s->tlsext_ticket_expected)
 524                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 525                                 else
 526 #endif
 527
 528                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 529                                 }
 530                         s->init_num=0;
 531                         break;
 532
 533 #ifndef OPENSSL_NO_TLSEXT
 534                 case SSL3_ST_CR_SESSION_TICKET_A:
 535                 case SSL3_ST_CR_SESSION_TICKET_B:
 536                         ret=ssl3_get_new_session_ticket(s);
 537                         if (ret <= 0) goto end;
 538                         s->state=SSL3_ST_CR_FINISHED_A;
 539                         s->init_num=0;
 540                 break;
 541
 542                 case SSL3_ST_CR_CERT_STATUS_A:
 543                 case SSL3_ST_CR_CERT_STATUS_B:
 544                         ret=ssl3_get_cert_status(s);
 545                         if (ret <= 0) goto end;
 546                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 547                         s->init_num=0;
 548                 break;
 549 #endif
 550
 551                 case SSL3_ST_CR_FINISHED_A:
 552                 case SSL3_ST_CR_FINISHED_B:
 553                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 554                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 555                                 SSL3_ST_CR_FINISHED_B);
 556                         if (ret <= 0) goto end;
 557
 558                         if (s->hit)
 559                                 s->state=SSL3_ST_CW_CHANGE_A;
 560                         else
 561                                 s->state=SSL_ST_OK;
 562                         s->init_num=0;
 563                         break;
 564
 565                 case SSL3_ST_CW_FLUSH:
 566                         s->rwstate=SSL_WRITING;
 567                         if (BIO_flush(s->wbio) <= 0)
 568                                 {
 569                                 ret= -1;
 570                                 goto end;
 571                                 }
 572                         s->rwstate=SSL_NOTHING;
 573                         s->state=s->s3->tmp.next_state;
 574                         break;
 575
 576                 case SSL_ST_OK:
 577                         /* clean a few things up */
 578                         ssl3_cleanup_key_block(s);
 579
 580                         if (s->init_buf != NULL)
 581                                 {
 582                                 BUF_MEM_free(s->init_buf);
 583                                 s->init_buf=NULL;
 584                                 }
 585
 586                         /* If we are not 'joining' the last two packets,
 587                          * remove the buffering now */
 588                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 589                                 ssl_free_wbio_buffer(s);
 590                         /* else do it later in ssl3_write */
 591
 592                         s->init_num=0;
 593                         s->renegotiate=0;
 594                         s->new_session=0;
 595
 596                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 597                         if (s->hit) s->ctx->stats.sess_hit++;
 598
 599                         ret=1;
 600                         /* s->server=0; */
 601                         s->handshake_func=ssl3_connect;
 602                         s->ctx->stats.sess_connect_good++;
 603
 604                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 605
 606                         goto end;
 607                         /* break; */
 608
 609                 default:
 610                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 611                         ret= -1;
 612                         goto end;
 613                         /* break; */
 614                         }
 615
 616                 /* did we do anything */
 617                 if (!s->s3->tmp.reuse_message && !skip)
 618                         {
 619                         if (s->debug)
 620                                 {
 621                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 622                                         goto end;
 623                                 }
 624
 625                         if ((cb != NULL) && (s->state != state))
 626                                 {
 627                                 new_state=s->state;
 628                                 s->state=state;
 629                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 630                                 s->state=new_state;
 631                                 }
 632                         }
 633                 skip=0;
 634                 }
 635 end:
 636         s->in_handshake--;
 637         if (buf != NULL)
 638                 BUF_MEM_free(buf);
 639         if (cb != NULL)
 640                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 641         return(ret);
 642         }
 643
 644
 645 int ssl3_client_hello(SSL *s)
 646         {
 647         unsigned char *buf;
 648         unsigned char *p,*d;
 649         int i;
 650         unsigned long l;
 651         int al = 0;
 652 #ifndef OPENSSL_NO_COMP
 653         int j;
 654         SSL_COMP *comp;
 655 #endif
 656
 657         buf=(unsigned char *)s->init_buf->data;
 658         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 659                 {
 660                 SSL_SESSION *sess = s->session;
 661                 if ((sess == NULL) ||
 662                         (sess->ssl_version != s->version) ||
 663                         !sess->session_id_length ||
 664                         (sess->not_resumable))
 665                         {
 666                         if (!ssl_get_new_session(s,0))
 667                                 goto err;
 668                         }
 669                 if (s->method->version == DTLS_ANY_VERSION)
 670                         {
 671                         /* Determine which DTLS version to use */
 672                         int options = s->options;
 673                         /* If DTLS 1.2 disabled correct the version number */
 674                         if (options & SSL_OP_NO_DTLSv1_2)
 675                                 {
 676                                 if (tls1_suiteb(s))
 677                                         {
 678                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
 679                                         goto err;
 680                                         }
 681                                 /* Disabling all versions is silly: return an
 682                                  * error.
 683                                  */
 684                                 if (options & SSL_OP_NO_DTLSv1)
 685                                         {
 686                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_WRONG_SSL_VERSION);
 687                                         goto err;
 688                                         }
 689                                 /* Update method so we don't use any DTLS 1.2
 690                                  * features.
 691                                  */
 692                                 s->method = DTLSv1_client_method();
 693                                 s->version = DTLS1_VERSION;
 694                                 }
 695                         else
 696                                 {
 697                                 /* We only support one version: update method */
 698                                 if (options & SSL_OP_NO_DTLSv1)
 699                                         s->method = DTLSv1_2_client_method();
 700                                 s->version = DTLS1_2_VERSION;
 701                                 }
 702                         s->client_version = s->version;
 703                         }
 704                 /* else use the pre-loaded session */
 705
 706                 p=s->s3->client_random;
 707
 708                 /* for DTLS if client_random is initialized, reuse it, we are
 709                  * required to use same upon reply to HelloVerify */
 710                 if (SSL_IS_DTLS(s))
 711                         {
 712                         size_t idx;
 713                         i = 1;
 714                         for (idx=0; idx < sizeof(s->s3->client_random); idx++)
 715                                 {
 716                                 if (p[idx])
 717                                         {
 718                                         i = 0;
 719                                         break;
 720                                         }
 721                                 }
 722                         }
 723                 else
 724                         i = 1;
 725
 726                 if (i)
 727                         ssl_fill_hello_random(s, 0, p,
 728                                               sizeof(s->s3->client_random));
 729
 730                 /* Do the message type and length last */
 731                 d=p= ssl_handshake_start(s);
 732
 733                 /* version indicates the negotiated version: for example from
 734                  * an SSLv2/v3 compatible client hello). The client_version
 735                  * field is the maximum version we permit and it is also
 736                  * used in RSA encrypted premaster secrets. Some servers can
 737                  * choke if we initially report a higher version then
 738                  * renegotiate to a lower one in the premaster secret. This
 739                  * didn't happen with TLS 1.0 as most servers supported it
 740                  * but it can with TLS 1.1 or later if the server only supports
 741                  * 1.0.
 742                  *
 743                  * Possible scenario with previous logic:
 744                  *      1. Client hello indicates TLS 1.2
 745                  *      2. Server hello says TLS 1.0
 746                  *      3. RSA encrypted premaster secret uses 1.2.
 747                  *      4. Handhaked proceeds using TLS 1.0.
 748                  *      5. Server sends hello request to renegotiate.
 749                  *      6. Client hello indicates TLS v1.0 as we now
 750                  *         know that is maximum server supports.
 751                  *      7. Server chokes on RSA encrypted premaster secret
 752                  *         containing version 1.0.
 753                  *
 754                  * For interoperability it should be OK to always use the
 755                  * maximum version we support in client hello and then rely
 756                  * on the checking of version to ensure the servers isn't
 757                  * being inconsistent: for example initially negotiating with
 758                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
 759                  * client_version in client hello and not resetting it to
 760                  * the negotiated version.
 761                  */
 762 #if 0
 763                 *(p++)=s->version>>8;
 764                 *(p++)=s->version&0xff;
 765                 s->client_version=s->version;
 766 #else
 767                 *(p++)=s->client_version>>8;
 768                 *(p++)=s->client_version&0xff;
 769 #endif
 770
 771                 /* Random stuff */
 772                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 773                 p+=SSL3_RANDOM_SIZE;
 774
 775                 /* Session ID */
 776                 if (s->new_session)
 777                         i=0;
 778                 else
 779                         i=s->session->session_id_length;
 780                 *(p++)=i;
 781                 if (i != 0)
 782                         {
 783                         if (i > (int)sizeof(s->session->session_id))
 784                                 {
 785                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 786                                 goto err;
 787                                 }
 788                         memcpy(p,s->session->session_id,i);
 789                         p+=i;
 790                         }
 791
 792                 /* cookie stuff for DTLS */
 793                 if (SSL_IS_DTLS(s))
 794                         {
 795                         if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 796                                 {
 797                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 798                                 goto err;
 799                                 }
 800                         *(p++) = s->d1->cookie_len;
 801                         memcpy(p, s->d1->cookie, s->d1->cookie_len);
 802                         p += s->d1->cookie_len;
 803                         }
 804
 805                 /* Ciphers supported */
 806                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 807                 if (i == 0)
 808                         {
 809                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 810                         goto err;
 811                         }
 812 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
 813                         /* Some servers hang if client hello > 256 bytes
 814                          * as hack workaround chop number of supported ciphers
 815                          * to keep it well below this if we use TLS v1.2
 816                          */
 817                         if (TLS1_get_version(s) >= TLS1_2_VERSION
 818                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
 819                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
 820 #endif
 821                 s2n(i,p);
 822                 p+=i;
 823
 824                 /* COMPRESSION */
 825 #ifdef OPENSSL_NO_COMP
 826                 *(p++)=1;
 827 #else
 828
 829                 if (!ssl_allow_compression(s) || !s->ctx->comp_methods)
 830                         j=0;
 831                 else
 832                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 833                 *(p++)=1+j;
 834                 for (i=0; i<j; i++)
 835                         {
 836                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 837                         *(p++)=comp->id;
 838                         }
 839 #endif
 840                 *(p++)=0; /* Add the NULL method */
 841
 842 #ifndef OPENSSL_NO_TLSEXT
 843                 /* TLS extensions*/
 844                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 845                         {
 846                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 847                         goto err;
 848                         }
 849                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL)
 850                         {
 851                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 852                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 853                         goto err;
 854                         }
 855 #endif
 856
 857                 l= p-d;
 858                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l);
 859                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 860                 }
 861
 862         /* SSL3_ST_CW_CLNT_HELLO_B */
 863         return ssl_do_write(s);
 864 err:
 865         return(-1);
 866         }
 867
 868 int ssl3_get_server_hello(SSL *s)
 869         {
 870         STACK_OF(SSL_CIPHER) *sk;
 871         const SSL_CIPHER *c;
 872         CERT *ct = s->cert;
 873         unsigned char *p,*d;
 874         int i,al=SSL_AD_INTERNAL_ERROR,ok;
 875         unsigned int j;
 876         long n;
 877 #ifndef OPENSSL_NO_COMP
 878         SSL_COMP *comp;
 879 #endif
 880         /* Hello verify request and/or server hello version may not
 881          * match so set first packet if we're negotiating version.
 882          */
 883         if (SSL_IS_DTLS(s))
 884                 s->first_packet = 1;
 885
 886         n=s->method->ssl_get_message(s,
 887                 SSL3_ST_CR_SRVR_HELLO_A,
 888                 SSL3_ST_CR_SRVR_HELLO_B,
 889                 -1,
 890                 20000, /* ?? */
 891                 &ok);
 892
 893         if (!ok) return((int)n);
 894
 895         if (SSL_IS_DTLS(s))
 896                 {
 897                 s->first_packet = 0;
 898                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 899                         {
 900                         if ( s->d1->send_cookie == 0)
 901                                 {
 902                                 s->s3->tmp.reuse_message = 1;
 903                                 return 1;
 904                                 }
 905                         else /* already sent a cookie */
 906                                 {
 907                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 908                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 909                                 goto f_err;
 910                                 }
 911                         }
 912                 }
 913
 914         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 915                 {
 916                 al=SSL_AD_UNEXPECTED_MESSAGE;
 917                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 918                 goto f_err;
 919                 }
 920
 921         d=p=(unsigned char *)s->init_msg;
 922         if (s->method->version == DTLS_ANY_VERSION)
 923                 {
 924                 /* Work out correct protocol version to use */
 925                 int hversion = (p[0] << 8)|p[1];
 926                 int options = s->options;
 927                 if (hversion == DTLS1_2_VERSION
 928                         && !(options & SSL_OP_NO_DTLSv1_2))
 929                         s->method = DTLSv1_2_client_method();
 930                 else if (tls1_suiteb(s))
 931                         {
 932                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
 933                         s->version = hversion;
 934                         al = SSL_AD_PROTOCOL_VERSION;
 935                         goto f_err;
 936                         }
 937                 else if (hversion == DTLS1_VERSION
 938                         && !(options & SSL_OP_NO_DTLSv1))
 939                         s->method = DTLSv1_client_method();
 940                 else
 941                         {
 942                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 943                         s->version = hversion;
 944                         al = SSL_AD_PROTOCOL_VERSION;
 945                         goto f_err;
 946                         }
 947                 s->version = s->client_version = s->method->version;
 948                 }
 949
 950         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 951                 {
 952                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 953                 s->version=(s->version&0xff00)|p[1];
 954                 al=SSL_AD_PROTOCOL_VERSION;
 955                 goto f_err;
 956                 }
 957         p+=2;
 958
 959         /* load the server hello data */
 960         /* load the server random */
 961         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 962         p+=SSL3_RANDOM_SIZE;
 963
 964         s->hit = 0;
 965
 966         /* get the session-id */
 967         j= *(p++);
 968
 969         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 970                 {
 971                 al=SSL_AD_ILLEGAL_PARAMETER;
 972                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 973                 goto f_err;
 974                 }
 975
 976 #ifndef OPENSSL_NO_TLSEXT
 977         /* check if we want to resume the session based on external pre-shared secret */
 978         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 979                 {
 980                 SSL_CIPHER *pref_cipher=NULL;
 981                 s->session->master_key_length=sizeof(s->session->master_key);
 982                 if (s->tls_session_secret_cb(s, s->session->master_key,
 983                                              &s->session->master_key_length,
 984                                              NULL, &pref_cipher,
 985                                              s->tls_session_secret_cb_arg))
 986                         {
 987                         s->session->cipher = pref_cipher ?
 988                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
 989                         s->hit = 1;
 990                         }
 991                 }
 992 #endif /* OPENSSL_NO_TLSEXT */
 993
 994         if (!s->hit && j != 0 && j == s->session->session_id_length
 995             && memcmp(p,s->session->session_id,j) == 0)
 996             {
 997             if(s->sid_ctx_length != s->session->sid_ctx_length
 998                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 999                 {
1000                 /* actually a client application bug */
1001                 al=SSL_AD_ILLEGAL_PARAMETER;
1002                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
1003                 goto f_err;
1004                 }
1005             s->hit=1;
1006             }
1007         /* a miss or crap from the other end */
1008         if (!s->hit)
1009                 {
1010                 /* If we were trying for session-id reuse, make a new
1011                  * SSL_SESSION so we don't stuff up other people */
1012                 if (s->session->session_id_length > 0)
1013                         {
1014                         if (!ssl_get_new_session(s,0))
1015                                 {
1016                                 goto f_err;
1017                                 }
1018                         }
1019                 s->session->session_id_length=j;
1020                 memcpy(s->session->session_id,p,j); /* j could be 0 */
1021                 }
1022         p+=j;
1023         c=ssl_get_cipher_by_char(s,p);
1024         if (c == NULL)
1025                 {
1026                 /* unknown cipher */
1027                 al=SSL_AD_ILLEGAL_PARAMETER;
1028                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
1029                 goto f_err;
1030                 }
1031         /* Set version disabled mask now we know version */
1032         if (!SSL_USE_TLS1_2_CIPHERS(s))
1033                 ct->mask_ssl = SSL_TLSV1_2;
1034         else
1035                 ct->mask_ssl = 0;
1036         /* If it is a disabled cipher we didn't send it in client hello,
1037          * so return an error.
1038          */
1039         if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_CHECK))
1040                 {
1041                 al=SSL_AD_ILLEGAL_PARAMETER;
1042                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1043                 goto f_err;
1044                 }
1045         p+=ssl_put_cipher_by_char(s,NULL,NULL);
1046
1047         sk=ssl_get_ciphers_by_id(s);
1048         i=sk_SSL_CIPHER_find(sk,c);
1049         if (i < 0)
1050                 {
1051                 /* we did not say we would use this cipher */
1052                 al=SSL_AD_ILLEGAL_PARAMETER;
1053                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1054                 goto f_err;
1055                 }
1056
1057         /* Depending on the session caching (internal/external), the cipher
1058            and/or cipher_id values may not be set. Make sure that
1059            cipher_id is set and use it for comparison. */
1060         if (s->session->cipher)
1061                 s->session->cipher_id = s->session->cipher->id;
1062         if (s->hit && (s->session->cipher_id != c->id))
1063                 {
1064 /* Workaround is now obsolete */
1065 #if 0
1066                 if (!(s->options &
1067                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
1068 #endif
1069                         {
1070                         al=SSL_AD_ILLEGAL_PARAMETER;
1071                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1072                         goto f_err;
1073                         }
1074                 }
1075         s->s3->tmp.new_cipher=c;
1076         /* Don't digest cached records if no sigalgs: we may need them for
1077          * client authentication.
1078          */
1079         if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s))
1080                 goto f_err;
1081         /* lets get the compression algorithm */
1082         /* COMPRESSION */
1083 #ifdef OPENSSL_NO_COMP
1084         if (*(p++) != 0)
1085                 {
1086                 al=SSL_AD_ILLEGAL_PARAMETER;
1087                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1088                 goto f_err;
1089                 }
1090         /* If compression is disabled we'd better not try to resume a session
1091          * using compression.
1092          */
1093         if (s->session->compress_meth != 0)
1094                 {
1095                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1096                 goto f_err;
1097                 }
1098 #else
1099         j= *(p++);
1100         if (s->hit && j != s->session->compress_meth)
1101                 {
1102                 al=SSL_AD_ILLEGAL_PARAMETER;
1103                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1104                 goto f_err;
1105                 }
1106         if (j == 0)
1107                 comp=NULL;
1108         else if (!ssl_allow_compression(s))
1109                 {
1110                 al=SSL_AD_ILLEGAL_PARAMETER;
1111                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1112                 goto f_err;
1113                 }
1114         else
1115                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1116
1117         if ((j != 0) && (comp == NULL))
1118                 {
1119                 al=SSL_AD_ILLEGAL_PARAMETER;
1120                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1121                 goto f_err;
1122                 }
1123         else
1124                 {
1125                 s->s3->tmp.new_compression=comp;
1126                 }
1127 #endif
1128
1129 #ifndef OPENSSL_NO_TLSEXT
1130         /* TLS extensions*/
1131         if (!ssl_parse_serverhello_tlsext(s,&p,d,n))
1132                 {
1133                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1134                 goto err;
1135                 }
1136 #endif
1137
1138         if (p != (d+n))
1139                 {
1140                 /* wrong packet length */
1141                 al=SSL_AD_DECODE_ERROR;
1142                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1143                 goto f_err;
1144                 }
1145
1146         return(1);
1147 f_err:
1148         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1149 err:
1150         return(-1);
1151         }
1152
1153 int ssl3_get_server_certificate(SSL *s)
1154         {
1155         int al,i,ok,ret= -1;
1156         unsigned long n,nc,llen,l;
1157         X509 *x=NULL;
1158         const unsigned char *q,*p;
1159         unsigned char *d;
1160         STACK_OF(X509) *sk=NULL;
1161         SESS_CERT *sc;
1162         EVP_PKEY *pkey=NULL;
1163         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1164
1165         n=s->method->ssl_get_message(s,
1166                 SSL3_ST_CR_CERT_A,
1167                 SSL3_ST_CR_CERT_B,
1168                 -1,
1169                 s->max_cert_list,
1170                 &ok);
1171
1172         if (!ok) return((int)n);
1173
1174         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1175                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1176                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1177                 {
1178                 s->s3->tmp.reuse_message=1;
1179                 return(1);
1180                 }
1181
1182         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1183                 {
1184                 al=SSL_AD_UNEXPECTED_MESSAGE;
1185                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1186                 goto f_err;
1187                 }
1188         p=d=(unsigned char *)s->init_msg;
1189
1190         if ((sk=sk_X509_new_null()) == NULL)
1191                 {
1192                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1193                 goto err;
1194                 }
1195
1196         n2l3(p,llen);
1197         if (llen+3 != n)
1198                 {
1199                 al=SSL_AD_DECODE_ERROR;
1200                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1201                 goto f_err;
1202                 }
1203         for (nc=0; nc<llen; )
1204                 {
1205                 n2l3(p,l);
1206                 if ((l+nc+3) > llen)
1207                         {
1208                         al=SSL_AD_DECODE_ERROR;
1209                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1210                         goto f_err;
1211                         }
1212
1213                 q=p;
1214                 x=d2i_X509(NULL,&q,l);
1215                 if (x == NULL)
1216                         {
1217                         al=SSL_AD_BAD_CERTIFICATE;
1218                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1219                         goto f_err;
1220                         }
1221                 if (q != (p+l))
1222                         {
1223                         al=SSL_AD_DECODE_ERROR;
1224                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1225                         goto f_err;
1226                         }
1227                 if (!sk_X509_push(sk,x))
1228                         {
1229                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1230                         goto err;
1231                         }
1232                 x=NULL;
1233                 nc+=l+3;
1234                 p=q;
1235                 }
1236
1237         i=ssl_verify_cert_chain(s,sk);
1238         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1239 #ifndef OPENSSL_NO_KRB5
1240             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1241                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1242 #endif /* OPENSSL_NO_KRB5 */
1243                 )
1244                 {
1245                 al=ssl_verify_alarm_type(s->verify_result);
1246                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1247                 goto f_err;
1248                 }
1249         ERR_clear_error(); /* but we keep s->verify_result */
1250         if (i > 1)
1251                 {
1252                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE, i);
1253                 al = SSL_AD_HANDSHAKE_FAILURE;
1254                 goto f_err;
1255                 }
1256
1257         sc=ssl_sess_cert_new();
1258         if (sc == NULL) goto err;
1259
1260         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1261         s->session->sess_cert=sc;
1262
1263         sc->cert_chain=sk;
1264         /* Inconsistency alert: cert_chain does include the peer's
1265          * certificate, which we don't include in s3_srvr.c */
1266         x=sk_X509_value(sk,0);
1267         sk=NULL;
1268         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1269
1270         pkey=X509_get_pubkey(x);
1271
1272         /* VRS: allow null cert if auth == KRB5 */
1273         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1274                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1275                     ? 0 : 1;
1276
1277 #ifdef KSSL_DEBUG
1278         printf("pkey,x = %p, %p\n", pkey,x);
1279         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1280         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1281                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1282 #endif    /* KSSL_DEBUG */
1283
1284         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1285                 {
1286                 x=NULL;
1287                 al=SSL3_AL_FATAL;
1288                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1289                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1290                 goto f_err;
1291                 }
1292
1293         i=ssl_cert_type(x,pkey);
1294         if (need_cert && i < 0)
1295                 {
1296                 x=NULL;
1297                 al=SSL3_AL_FATAL;
1298                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1299                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1300                 goto f_err;
1301                 }
1302
1303         if (need_cert)
1304                 {
1305                 int exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
1306                 if (exp_idx >= 0 && i != exp_idx)
1307                         {
1308                         x=NULL;
1309                         al=SSL_AD_ILLEGAL_PARAMETER;
1310                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1311                                 SSL_R_WRONG_CERTIFICATE_TYPE);
1312                         goto f_err;
1313                         }
1314                 sc->peer_cert_type=i;
1315                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1316                 /* Why would the following ever happen?
1317                  * We just created sc a couple of lines ago. */
1318                 if (sc->peer_pkeys[i].x509 != NULL)
1319                         X509_free(sc->peer_pkeys[i].x509);
1320                 sc->peer_pkeys[i].x509=x;
1321                 sc->peer_key= &(sc->peer_pkeys[i]);
1322
1323                 if (s->session->peer != NULL)
1324                         X509_free(s->session->peer);
1325                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1326                 s->session->peer=x;
1327                 }
1328         else
1329                 {
1330                 sc->peer_cert_type=i;
1331                 sc->peer_key= NULL;
1332
1333                 if (s->session->peer != NULL)
1334                         X509_free(s->session->peer);
1335                 s->session->peer=NULL;
1336                 }
1337         s->session->verify_result = s->verify_result;
1338
1339         x=NULL;
1340         ret=1;
1341         if (0)
1342                 {
1343 f_err:
1344                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1345                 }
1346 err:
1347         EVP_PKEY_free(pkey);
1348         X509_free(x);
1349         sk_X509_pop_free(sk,X509_free);
1350         return(ret);
1351         }
1352
1353 int ssl3_get_key_exchange(SSL *s)
1354         {
1355 #ifndef OPENSSL_NO_RSA
1356         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1357 #endif
1358         EVP_MD_CTX md_ctx;
1359         unsigned char *param,*p;
1360         int al,j,ok;
1361         long i,param_len,n,alg_k,alg_a;
1362         EVP_PKEY *pkey=NULL;
1363         const EVP_MD *md = NULL;
1364 #ifndef OPENSSL_NO_RSA
1365         RSA *rsa=NULL;
1366 #endif
1367 #ifndef OPENSSL_NO_DH
1368         DH *dh=NULL;
1369 #endif
1370 #ifndef OPENSSL_NO_ECDH
1371         EC_KEY *ecdh = NULL;
1372         BN_CTX *bn_ctx = NULL;
1373         EC_POINT *srvr_ecpoint = NULL;
1374         int curve_nid = 0;
1375         int encoded_pt_len = 0;
1376 #endif
1377
1378         /* use same message size as in ssl3_get_certificate_request()
1379          * as ServerKeyExchange message may be skipped */
1380         n=s->method->ssl_get_message(s,
1381                 SSL3_ST_CR_KEY_EXCH_A,
1382                 SSL3_ST_CR_KEY_EXCH_B,
1383                 -1,
1384                 s->max_cert_list,
1385                 &ok);
1386         if (!ok) return((int)n);
1387
1388         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1389                 {
1390 #ifndef OPENSSL_NO_PSK
1391                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1392                    omitted if no identity hint is sent. Set
1393                    session->sess_cert anyway to avoid problems
1394                    later.*/
1395                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1396                         {
1397                         s->session->sess_cert=ssl_sess_cert_new();
1398                         if (s->ctx->psk_identity_hint)
1399                                 OPENSSL_free(s->ctx->psk_identity_hint);
1400                         s->ctx->psk_identity_hint = NULL;
1401                         }
1402 #endif
1403                 s->s3->tmp.reuse_message=1;
1404                 return(1);
1405                 }
1406
1407         param=p=(unsigned char *)s->init_msg;
1408         if (s->session->sess_cert != NULL)
1409                 {
1410 #ifndef OPENSSL_NO_RSA
1411                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1412                         {
1413                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1414                         s->session->sess_cert->peer_rsa_tmp=NULL;
1415                         }
1416 #endif
1417 #ifndef OPENSSL_NO_DH
1418                 if (s->session->sess_cert->peer_dh_tmp)
1419                         {
1420                         DH_free(s->session->sess_cert->peer_dh_tmp);
1421                         s->session->sess_cert->peer_dh_tmp=NULL;
1422                         }
1423 #endif
1424 #ifndef OPENSSL_NO_ECDH
1425                 if (s->session->sess_cert->peer_ecdh_tmp)
1426                         {
1427                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1428                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1429                         }
1430 #endif
1431                 }
1432         else
1433                 {
1434                 s->session->sess_cert=ssl_sess_cert_new();
1435                 }
1436
1437         /* Total length of the parameters including the length prefix */
1438         param_len=0;
1439
1440         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1441         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1442         EVP_MD_CTX_init(&md_ctx);
1443
1444         al=SSL_AD_DECODE_ERROR;
1445
1446 #ifndef OPENSSL_NO_PSK
1447         if (alg_k & SSL_kPSK)
1448                 {
1449                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1450
1451                 param_len = 2;
1452                 if (param_len > n)
1453                         {
1454                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1455                                 SSL_R_LENGTH_TOO_SHORT);
1456                         goto f_err;
1457                         }
1458                 n2s(p,i);
1459
1460                 /* Store PSK identity hint for later use, hint is used
1461                  * in ssl3_send_client_key_exchange.  Assume that the
1462                  * maximum length of a PSK identity hint can be as
1463                  * long as the maximum length of a PSK identity. */
1464                 if (i > PSK_MAX_IDENTITY_LEN)
1465                         {
1466                         al=SSL_AD_HANDSHAKE_FAILURE;
1467                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1468                                 SSL_R_DATA_LENGTH_TOO_LONG);
1469                         goto f_err;
1470                         }
1471                 if (i > n - param_len)
1472                         {
1473                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1474                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1475                         goto f_err;
1476                         }
1477                 param_len += i;
1478
1479                 /* If received PSK identity hint contains NULL
1480                  * characters, the hint is truncated from the first
1481                  * NULL. p may not be ending with NULL, so create a
1482                  * NULL-terminated string. */
1483                 memcpy(tmp_id_hint, p, i);
1484                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1485                 if (s->ctx->psk_identity_hint != NULL)
1486                         OPENSSL_free(s->ctx->psk_identity_hint);
1487                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1488                 if (s->ctx->psk_identity_hint == NULL)
1489                         {
1490                         al=SSL_AD_HANDSHAKE_FAILURE;
1491                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1492                         goto f_err;
1493                         }
1494
1495                 p+=i;
1496                 n-=param_len;
1497                 }
1498         else
1499 #endif /* !OPENSSL_NO_PSK */
1500 #ifndef OPENSSL_NO_SRP
1501         if (alg_k & SSL_kSRP)
1502                 {
1503                 param_len = 2;
1504                 if (param_len > n)
1505                         {
1506                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1507                                 SSL_R_LENGTH_TOO_SHORT);
1508                         goto f_err;
1509                         }
1510                 n2s(p,i);
1511
1512                 if (i > n - param_len)
1513                         {
1514                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1515                         goto f_err;
1516                         }
1517                 param_len += i;
1518
1519                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1520                         {
1521                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1522                         goto err;
1523                         }
1524                 p+=i;
1525
1526
1527                 if (2 > n - param_len)
1528                         {
1529                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1530                                 SSL_R_LENGTH_TOO_SHORT);
1531                         goto f_err;
1532                         }
1533                 param_len += 2;
1534
1535                 n2s(p,i);
1536
1537                 if (i > n - param_len)
1538                         {
1539                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1540                         goto f_err;
1541                         }
1542                 param_len += i;
1543
1544                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1545                         {
1546                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1547                         goto err;
1548                         }
1549                 p+=i;
1550
1551
1552                 if (1 > n - param_len)
1553                         {
1554                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1555                                 SSL_R_LENGTH_TOO_SHORT);
1556                         goto f_err;
1557                         }
1558                 param_len += 1;
1559
1560                 i = (unsigned int)(p[0]);
1561                 p++;
1562
1563                 if (i > n - param_len)
1564                         {
1565                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1566                         goto f_err;
1567                         }
1568                 param_len += i;
1569
1570                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1571                         {
1572                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1573                         goto err;
1574                         }
1575                 p+=i;
1576
1577                 if (2 > n - param_len)
1578                         {
1579                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1580                                 SSL_R_LENGTH_TOO_SHORT);
1581                         goto f_err;
1582                         }
1583                 param_len += 2;
1584
1585                 n2s(p,i);
1586
1587                 if (i > n - param_len)
1588                         {
1589                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1590                         goto f_err;
1591                         }
1592                 param_len += i;
1593
1594                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1595                         {
1596                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1597                         goto err;
1598                         }
1599                 p+=i;
1600                 n-=param_len;
1601
1602                 if (!srp_verify_server_param(s, &al))
1603                         {
1604                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
1605                         goto f_err;
1606                         }
1607
1608 /* We must check if there is a certificate */
1609 #ifndef OPENSSL_NO_RSA
1610                 if (alg_a & SSL_aRSA)
1611                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1612 #else
1613                 if (0)
1614                         ;
1615 #endif
1616 #ifndef OPENSSL_NO_DSA
1617                 else if (alg_a & SSL_aDSS)
1618                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1619 #endif
1620                 }
1621         else
1622 #endif /* !OPENSSL_NO_SRP */
1623 #ifndef OPENSSL_NO_RSA
1624         if (alg_k & SSL_kRSA)
1625                 {
1626                 if ((rsa=RSA_new()) == NULL)
1627                         {
1628                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1629                         goto err;
1630                         }
1631
1632                 param_len = 2;
1633                 if (param_len > n)
1634                         {
1635                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1636                                 SSL_R_LENGTH_TOO_SHORT);
1637                         goto f_err;
1638                         }
1639                 n2s(p,i);
1640
1641                 if (i > n - param_len)
1642                         {
1643                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1644                         goto f_err;
1645                         }
1646                 param_len += i;
1647
1648                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1649                         {
1650                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1651                         goto err;
1652                         }
1653                 p+=i;
1654
1655                 if (2 > n - param_len)
1656                         {
1657                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1658                                 SSL_R_LENGTH_TOO_SHORT);
1659                         goto f_err;
1660                         }
1661                 param_len += 2;
1662
1663                 n2s(p,i);
1664
1665                 if (i > n - param_len)
1666                         {
1667                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1668                         goto f_err;
1669                         }
1670                 param_len += i;
1671
1672                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1673                         {
1674                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1675                         goto err;
1676                         }
1677                 p+=i;
1678                 n-=param_len;
1679
1680                 /* this should be because we are using an export cipher */
1681                 if (alg_a & SSL_aRSA)
1682                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1683                 else
1684                         {
1685                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1686                         goto err;
1687                         }
1688                 s->session->sess_cert->peer_rsa_tmp=rsa;
1689                 rsa=NULL;
1690                 }
1691 #else /* OPENSSL_NO_RSA */
1692         if (0)
1693                 ;
1694 #endif
1695 #ifndef OPENSSL_NO_DH
1696         else if (alg_k & SSL_kDHE)
1697                 {
1698                 if ((dh=DH_new()) == NULL)
1699                         {
1700                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1701                         goto err;
1702                         }
1703
1704                 param_len = 2;
1705                 if (param_len > n)
1706                         {
1707                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1708                                 SSL_R_LENGTH_TOO_SHORT);
1709                         goto f_err;
1710                         }
1711                 n2s(p,i);
1712
1713                 if (i > n - param_len)
1714                         {
1715                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1716                         goto f_err;
1717                         }
1718                 param_len += i;
1719
1720                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1721                         {
1722                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1723                         goto err;
1724                         }
1725                 p+=i;
1726
1727                 if (2 > n - param_len)
1728                         {
1729                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1730                                 SSL_R_LENGTH_TOO_SHORT);
1731                         goto f_err;
1732                         }
1733                 param_len += 2;
1734
1735                 n2s(p,i);
1736
1737                 if (i > n - param_len)
1738                         {
1739                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1740                         goto f_err;
1741                         }
1742                 param_len += i;
1743
1744                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1745                         {
1746                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1747                         goto err;
1748                         }
1749                 p+=i;
1750
1751                 if (2 > n - param_len)
1752                         {
1753                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1754                                 SSL_R_LENGTH_TOO_SHORT);
1755                         goto f_err;
1756                         }
1757                 param_len += 2;
1758
1759                 n2s(p,i);
1760
1761                 if (i > n - param_len)
1762                         {
1763                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1764                         goto f_err;
1765                         }
1766                 param_len += i;
1767
1768                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1769                         {
1770                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1771                         goto err;
1772                         }
1773                 p+=i;
1774                 n-=param_len;
1775
1776                 if (!ssl_security(s, SSL_SECOP_TMP_DH,
1777                                                 DH_security_bits(dh), 0, dh))
1778                         {
1779                         al=SSL_AD_HANDSHAKE_FAILURE;
1780                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_DH_KEY_TOO_SMALL);
1781                         goto f_err;
1782                         }
1783
1784 #ifndef OPENSSL_NO_RSA
1785                 if (alg_a & SSL_aRSA)
1786                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1787 #else
1788                 if (0)
1789                         ;
1790 #endif
1791 #ifndef OPENSSL_NO_DSA
1792                 else if (alg_a & SSL_aDSS)
1793                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1794 #endif
1795                 /* else anonymous DH, so no certificate or pkey. */
1796
1797                 s->session->sess_cert->peer_dh_tmp=dh;
1798                 dh=NULL;
1799                 }
1800         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1801                 {
1802                 al=SSL_AD_ILLEGAL_PARAMETER;
1803                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1804                 goto f_err;
1805                 }
1806 #endif /* !OPENSSL_NO_DH */
1807
1808 #ifndef OPENSSL_NO_ECDH
1809         else if (alg_k & SSL_kECDHE)
1810                 {
1811                 EC_GROUP *ngroup;
1812                 const EC_GROUP *group;
1813
1814                 if ((ecdh=EC_KEY_new()) == NULL)
1815                         {
1816                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1817                         goto err;
1818                         }
1819
1820                 /* Extract elliptic curve parameters and the
1821                  * server's ephemeral ECDH public key.
1822                  * Keep accumulating lengths of various components in
1823                  * param_len and make sure it never exceeds n.
1824                  */
1825
1826                 /* XXX: For now we only support named (not generic) curves
1827                  * and the ECParameters in this case is just three bytes. We
1828                  * also need one byte for the length of the encoded point
1829                  */
1830                 param_len=4;
1831                 if (param_len > n)
1832                         {
1833                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1834                                 SSL_R_LENGTH_TOO_SHORT);
1835                         goto f_err;
1836                         }
1837                 /* Check curve is one of our preferences, if not server has
1838                  * sent an invalid curve. ECParameters is 3 bytes.
1839                  */
1840                 if (!tls1_check_curve(s, p, 3))
1841                         {
1842                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_CURVE);
1843                         goto f_err;
1844                         }
1845
1846                 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)
1847                         {
1848                         al=SSL_AD_INTERNAL_ERROR;
1849                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1850                         goto f_err;
1851                         }
1852
1853                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1854                 if (ngroup == NULL)
1855                         {
1856                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1857                         goto err;
1858                         }
1859                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1860                         {
1861                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1862                         goto err;
1863                         }
1864                 EC_GROUP_free(ngroup);
1865
1866                 group = EC_KEY_get0_group(ecdh);
1867
1868                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1869                     (EC_GROUP_get_degree(group) > 163))
1870                         {
1871                         al=SSL_AD_EXPORT_RESTRICTION;
1872                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1873                         goto f_err;
1874                         }
1875
1876                 p+=3;
1877
1878                 /* Next, get the encoded ECPoint */
1879                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1880                     ((bn_ctx = BN_CTX_new()) == NULL))
1881                         {
1882                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1883                         goto err;
1884                         }
1885
1886                 encoded_pt_len = *p;  /* length of encoded point */
1887                 p+=1;
1888
1889                 if ((encoded_pt_len > n - param_len) ||
1890                     (EC_POINT_oct2point(group, srvr_ecpoint,
1891                         p, encoded_pt_len, bn_ctx) == 0))
1892                         {
1893                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1894                         goto f_err;
1895                         }
1896                 param_len += encoded_pt_len;
1897
1898                 n-=param_len;
1899                 p+=encoded_pt_len;
1900
1901                 /* The ECC/TLS specification does not mention
1902                  * the use of DSA to sign ECParameters in the server
1903                  * key exchange message. We do support RSA and ECDSA.
1904                  */
1905                 if (0) ;
1906 #ifndef OPENSSL_NO_RSA
1907                 else if (alg_a & SSL_aRSA)
1908                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1909 #endif
1910 #ifndef OPENSSL_NO_ECDSA
1911                 else if (alg_a & SSL_aECDSA)
1912                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1913 #endif
1914                 /* else anonymous ECDH, so no certificate or pkey. */
1915                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1916                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1917                 ecdh=NULL;
1918                 BN_CTX_free(bn_ctx);
1919                 bn_ctx = NULL;
1920                 EC_POINT_free(srvr_ecpoint);
1921                 srvr_ecpoint = NULL;
1922                 }
1923         else if (alg_k)
1924                 {
1925                 al=SSL_AD_UNEXPECTED_MESSAGE;
1926                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1927                 goto f_err;
1928                 }
1929 #endif /* !OPENSSL_NO_ECDH */
1930
1931
1932         /* p points to the next byte, there are 'n' bytes left */
1933
1934         /* if it was signed, check the signature */
1935         if (pkey != NULL)
1936                 {
1937                 if (SSL_USE_SIGALGS(s))
1938                         {
1939                         int rv;
1940                         if (2 > n)
1941                                 {
1942                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1943                                         SSL_R_LENGTH_TOO_SHORT);
1944                                 goto f_err;
1945                                 }
1946                         rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1947                         if (rv == -1)
1948                                 goto err;
1949                         else if (rv == 0)
1950                                 {
1951                                 goto f_err;
1952                                 }
1953 #ifdef SSL_DEBUG
1954 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1955 #endif
1956                         p += 2;
1957                         n -= 2;
1958                         }
1959                 else
1960                         md = EVP_sha1();
1961
1962                 if (2 > n)
1963                         {
1964                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1965                                 SSL_R_LENGTH_TOO_SHORT);
1966                         goto f_err;
1967                         }
1968                 n2s(p,i);
1969                 n-=2;
1970                 j=EVP_PKEY_size(pkey);
1971
1972                 /* Check signature length. If n is 0 then signature is empty */
1973                 if ((i != n) || (n > j) || (n <= 0))
1974                         {
1975                         /* wrong packet length */
1976                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1977                         goto f_err;
1978                         }
1979
1980 #ifndef OPENSSL_NO_RSA
1981                 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
1982                         {
1983                         int num;
1984                         unsigned int size;
1985
1986                         j=0;
1987                         q=md_buf;
1988                         for (num=2; num > 0; num--)
1989                                 {
1990                                 EVP_MD_CTX_set_flags(&md_ctx,
1991                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1992                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1993                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1994                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1995                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1996                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1997                                 EVP_DigestFinal_ex(&md_ctx,q,&size);
1998                                 q+=size;
1999                                 j+=size;
2000                                 }
2001                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
2002                                                                 pkey->pkey.rsa);
2003                         if (i < 0)
2004                                 {
2005                                 al=SSL_AD_DECRYPT_ERROR;
2006                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
2007                                 goto f_err;
2008                                 }
2009                         if (i == 0)
2010                                 {
2011                                 /* bad signature */
2012                                 al=SSL_AD_DECRYPT_ERROR;
2013                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
2014                                 goto f_err;
2015                                 }
2016                         }
2017                 else
2018 #endif
2019                         {
2020                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
2021                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2022                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2023                         EVP_VerifyUpdate(&md_ctx,param,param_len);
2024                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
2025                                 {
2026                                 /* bad signature */
2027                                 al=SSL_AD_DECRYPT_ERROR;
2028                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
2029                                 goto f_err;
2030                                 }
2031                         }
2032                 }
2033         else
2034                 {
2035                 /* aNULL, aSRP or kPSK do not need public keys */
2036                 if (!(alg_a & (SSL_aNULL|SSL_aSRP)) && !(alg_k & SSL_kPSK))
2037                         {
2038                         /* Might be wrong key type, check it */
2039                         if (ssl3_check_cert_and_algorithm(s))
2040                                 /* Otherwise this shouldn't happen */
2041                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2042                         goto err;
2043                         }
2044                 /* still data left over */
2045                 if (n != 0)
2046                         {
2047                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
2048                         goto f_err;
2049                         }
2050                 }
2051         EVP_PKEY_free(pkey);
2052         EVP_MD_CTX_cleanup(&md_ctx);
2053         return(1);
2054 f_err:
2055         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2056 err:
2057         EVP_PKEY_free(pkey);
2058 #ifndef OPENSSL_NO_RSA
2059         if (rsa != NULL)
2060                 RSA_free(rsa);
2061 #endif
2062 #ifndef OPENSSL_NO_DH
2063         if (dh != NULL)
2064                 DH_free(dh);
2065 #endif
2066 #ifndef OPENSSL_NO_ECDH
2067         BN_CTX_free(bn_ctx);
2068         EC_POINT_free(srvr_ecpoint);
2069         if (ecdh != NULL)
2070                 EC_KEY_free(ecdh);
2071 #endif
2072         EVP_MD_CTX_cleanup(&md_ctx);
2073         return(-1);
2074         }
2075
2076 int ssl3_get_certificate_request(SSL *s)
2077         {
2078         int ok,ret=0;
2079         unsigned long n,nc,l;
2080         unsigned int llen, ctype_num,i;
2081         X509_NAME *xn=NULL;
2082         const unsigned char *p,*q;
2083         unsigned char *d;
2084         STACK_OF(X509_NAME) *ca_sk=NULL;
2085
2086         n=s->method->ssl_get_message(s,
2087                 SSL3_ST_CR_CERT_REQ_A,
2088                 SSL3_ST_CR_CERT_REQ_B,
2089                 -1,
2090                 s->max_cert_list,
2091                 &ok);
2092
2093         if (!ok) return((int)n);
2094
2095         s->s3->tmp.cert_req=0;
2096
2097         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
2098                 {
2099                 s->s3->tmp.reuse_message=1;
2100                 /* If we get here we don't need any cached handshake records
2101                  * as we wont be doing client auth.
2102                  */
2103                 if (s->s3->handshake_buffer)
2104                         {
2105                         if (!ssl3_digest_cached_records(s))
2106                                 goto err;
2107                         }
2108                 return(1);
2109                 }
2110
2111         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
2112                 {
2113                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2114                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
2115                 goto err;
2116                 }
2117
2118         /* TLS does not like anon-DH with client cert */
2119         if (s->version > SSL3_VERSION)
2120                 {
2121                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
2122                         {
2123                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2124                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2125                         goto err;
2126                         }
2127                 }
2128
2129         p=d=(unsigned char *)s->init_msg;
2130
2131         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
2132                 {
2133                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2134                 goto err;
2135                 }
2136
2137         /* get the certificate types */
2138         ctype_num= *(p++);
2139         if (s->cert->ctypes)
2140                 {
2141                 OPENSSL_free(s->cert->ctypes);
2142                 s->cert->ctypes = NULL;
2143                 }
2144         if (ctype_num > SSL3_CT_NUMBER)
2145                 {
2146                 /* If we exceed static buffer copy all to cert structure */
2147                 s->cert->ctypes = OPENSSL_malloc(ctype_num);
2148                 if (s->cert->ctypes == NULL)
2149                         {
2150                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2151                         goto err;
2152                         }
2153                 memcpy(s->cert->ctypes, p, ctype_num);
2154                 s->cert->ctype_num = (size_t)ctype_num;
2155                 ctype_num=SSL3_CT_NUMBER;
2156                 }
2157         for (i=0; i<ctype_num; i++)
2158                 s->s3->tmp.ctype[i]= p[i];
2159         p+=p[-1];
2160         if (SSL_USE_SIGALGS(s))
2161                 {
2162                 n2s(p, llen);
2163                 /* Check we have enough room for signature algorithms and
2164                  * following length value.
2165                  */
2166                 if ((unsigned long)(p - d + llen + 2) > n)
2167                         {
2168                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2169                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
2170                         goto err;
2171                         }
2172                 /* Clear certificate digests and validity flags */
2173                 for (i = 0; i < SSL_PKEY_NUM; i++)
2174                         {
2175                         s->cert->pkeys[i].digest = NULL;
2176                         s->cert->pkeys[i].valid_flags = 0;
2177                         }
2178                 if ((llen & 1) || !tls1_save_sigalgs(s, p, llen))
2179                         {
2180                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2181                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2182                         goto err;
2183                         }
2184                 if (!tls1_process_sigalgs(s))
2185                         {
2186                         ssl3_send_alert(s,SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
2187                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2188                         goto err;
2189                         }
2190                 p += llen;
2191                 }
2192
2193         /* get the CA RDNs */
2194         n2s(p,llen);
2195 #if 0
2196 {
2197 FILE *out;
2198 out=fopen("/tmp/vsign.der","w");
2199 fwrite(p,1,llen,out);
2200 fclose(out);
2201 }
2202 #endif
2203
2204         if ((unsigned long)(p - d + llen) != n)
2205                 {
2206                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2207                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
2208                 goto err;
2209                 }
2210
2211         for (nc=0; nc<llen; )
2212                 {
2213                 n2s(p,l);
2214                 if ((l+nc+2) > llen)
2215                         {
2216                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2217                                 goto cont; /* netscape bugs */
2218                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2219                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2220                         goto err;
2221                         }
2222
2223                 q=p;
2224
2225                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2226                         {
2227                         /* If netscape tolerance is on, ignore errors */
2228                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2229                                 goto cont;
2230                         else
2231                                 {
2232                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2233                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2234                                 goto err;
2235                                 }
2236                         }
2237
2238                 if (q != (p+l))
2239                         {
2240                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2241                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2242                         goto err;
2243                         }
2244                 if (!sk_X509_NAME_push(ca_sk,xn))
2245                         {
2246                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2247                         goto err;
2248                         }
2249
2250                 p+=l;
2251                 nc+=l+2;
2252                 }
2253
2254         if (0)
2255                 {
2256 cont:
2257                 ERR_clear_error();
2258                 }
2259
2260         /* we should setup a certificate to return.... */
2261         s->s3->tmp.cert_req=1;
2262         s->s3->tmp.ctype_num=ctype_num;
2263         if (s->s3->tmp.ca_names != NULL)
2264                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2265         s->s3->tmp.ca_names=ca_sk;
2266         ca_sk=NULL;
2267
2268         ret=1;
2269 err:
2270         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2271         return(ret);
2272         }
2273
2274 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2275         {
2276         return(X509_NAME_cmp(*a,*b));
2277         }
2278 #ifndef OPENSSL_NO_TLSEXT
2279 int ssl3_get_new_session_ticket(SSL *s)
2280         {
2281         int ok,al,ret=0, ticklen;
2282         long n;
2283         const unsigned char *p;
2284         unsigned char *d;
2285
2286         n=s->method->ssl_get_message(s,
2287                 SSL3_ST_CR_SESSION_TICKET_A,
2288                 SSL3_ST_CR_SESSION_TICKET_B,
2289                 SSL3_MT_NEWSESSION_TICKET,
2290                 16384,
2291                 &ok);
2292
2293         if (!ok)
2294                 return((int)n);
2295
2296         if (n < 6)
2297                 {
2298                 /* need at least ticket_lifetime_hint + ticket length */
2299                 al = SSL_AD_DECODE_ERROR;
2300                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2301                 goto f_err;
2302                 }
2303
2304         p=d=(unsigned char *)s->init_msg;
2305         n2l(p, s->session->tlsext_tick_lifetime_hint);
2306         n2s(p, ticklen);
2307         /* ticket_lifetime_hint + ticket_length + ticket */
2308         if (ticklen + 6 != n)
2309                 {
2310                 al = SSL_AD_DECODE_ERROR;
2311                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2312                 goto f_err;
2313                 }
2314         if (s->session->tlsext_tick)
2315                 {
2316                 OPENSSL_free(s->session->tlsext_tick);
2317                 s->session->tlsext_ticklen = 0;
2318                 }
2319         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2320         if (!s->session->tlsext_tick)
2321                 {
2322                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2323                 goto err;
2324                 }
2325         memcpy(s->session->tlsext_tick, p, ticklen);
2326         s->session->tlsext_ticklen = ticklen;
2327         /* There are two ways to detect a resumed ticket session.
2328          * One is to set an appropriate session ID and then the server
2329          * must return a match in ServerHello. This allows the normal
2330          * client session ID matching to work and we know much
2331          * earlier that the ticket has been accepted.
2332          *
2333          * The other way is to set zero length session ID when the
2334          * ticket is presented and rely on the handshake to determine
2335          * session resumption.
2336          *
2337          * We choose the former approach because this fits in with
2338          * assumptions elsewhere in OpenSSL. The session ID is set
2339          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2340          * ticket.
2341          */
2342         EVP_Digest(p, ticklen,
2343                         s->session->session_id, &s->session->session_id_length,
2344 #ifndef OPENSSL_NO_SHA256
2345                                                         EVP_sha256(), NULL);
2346 #else
2347                                                         EVP_sha1(), NULL);
2348 #endif
2349         ret=1;
2350         return(ret);
2351 f_err:
2352         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2353 err:
2354         return(-1);
2355         }
2356
2357 int ssl3_get_cert_status(SSL *s)
2358         {
2359         int ok, al;
2360         unsigned long resplen,n;
2361         const unsigned char *p;
2362
2363         n=s->method->ssl_get_message(s,
2364                 SSL3_ST_CR_CERT_STATUS_A,
2365                 SSL3_ST_CR_CERT_STATUS_B,
2366                 SSL3_MT_CERTIFICATE_STATUS,
2367                 16384,
2368                 &ok);
2369
2370         if (!ok) return((int)n);
2371         if (n < 4)
2372                 {
2373                 /* need at least status type + length */
2374                 al = SSL_AD_DECODE_ERROR;
2375                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2376                 goto f_err;
2377                 }
2378         p = (unsigned char *)s->init_msg;
2379         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2380                 {
2381                 al = SSL_AD_DECODE_ERROR;
2382                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2383                 goto f_err;
2384                 }
2385         n2l3(p, resplen);
2386         if (resplen + 4 != n)
2387                 {
2388                 al = SSL_AD_DECODE_ERROR;
2389                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2390                 goto f_err;
2391                 }
2392         if (s->tlsext_ocsp_resp)
2393                 OPENSSL_free(s->tlsext_ocsp_resp);
2394         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2395         if (!s->tlsext_ocsp_resp)
2396                 {
2397                 al = SSL_AD_INTERNAL_ERROR;
2398                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2399                 goto f_err;
2400                 }
2401         s->tlsext_ocsp_resplen = resplen;
2402         if (s->ctx->tlsext_status_cb)
2403                 {
2404                 int ret;
2405                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2406                 if (ret == 0)
2407                         {
2408                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2409                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2410                         goto f_err;
2411                         }
2412                 if (ret < 0)
2413                         {
2414                         al = SSL_AD_INTERNAL_ERROR;
2415                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2416                         goto f_err;
2417                         }
2418                 }
2419         return 1;
2420 f_err:
2421         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2422         return(-1);
2423         }
2424 #endif
2425
2426 int ssl3_get_server_done(SSL *s)
2427         {
2428         int ok,ret=0;
2429         long n;
2430
2431         n=s->method->ssl_get_message(s,
2432                 SSL3_ST_CR_SRVR_DONE_A,
2433                 SSL3_ST_CR_SRVR_DONE_B,
2434                 SSL3_MT_SERVER_DONE,
2435                 30, /* should be very small, like 0 :-) */
2436                 &ok);
2437
2438         if (!ok) return((int)n);
2439         if (n > 0)
2440                 {
2441                 /* should contain no data */
2442                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2443                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2444                 return -1;
2445                 }
2446         ret=1;
2447         return(ret);
2448         }
2449
2450
2451 int ssl3_send_client_key_exchange(SSL *s)
2452         {
2453         unsigned char *p;
2454         int n;
2455         unsigned long alg_k;
2456 #ifndef OPENSSL_NO_RSA
2457         unsigned char *q;
2458         EVP_PKEY *pkey=NULL;
2459 #endif
2460 #ifndef OPENSSL_NO_KRB5
2461         KSSL_ERR kssl_err;
2462 #endif /* OPENSSL_NO_KRB5 */
2463 #ifndef OPENSSL_NO_ECDH
2464         EC_KEY *clnt_ecdh = NULL;
2465         const EC_POINT *srvr_ecpoint = NULL;
2466         EVP_PKEY *srvr_pub_pkey = NULL;
2467         unsigned char *encodedPoint = NULL;
2468         int encoded_pt_len = 0;
2469         BN_CTX * bn_ctx = NULL;
2470 #endif
2471
2472         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2473                 {
2474                 p = ssl_handshake_start(s);
2475
2476                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2477
2478                 /* Fool emacs indentation */
2479                 if (0) {}
2480 #ifndef OPENSSL_NO_RSA
2481                 else if (alg_k & SSL_kRSA)
2482                         {
2483                         RSA *rsa;
2484                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2485
2486                         if (s->session->sess_cert == NULL)
2487                                 {
2488                                 /* We should always have a server certificate with SSL_kRSA. */
2489                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2490                                 goto err;
2491                                 }
2492
2493                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2494                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2495                         else
2496                                 {
2497                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2498                                 if ((pkey == NULL) ||
2499                                         (pkey->type != EVP_PKEY_RSA) ||
2500                                         (pkey->pkey.rsa == NULL))
2501                                         {
2502                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2503                                         goto err;
2504                                         }
2505                                 rsa=pkey->pkey.rsa;
2506                                 EVP_PKEY_free(pkey);
2507                                 }
2508
2509                         tmp_buf[0]=s->client_version>>8;
2510                         tmp_buf[1]=s->client_version&0xff;
2511                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2512                                         goto err;
2513
2514                         s->session->master_key_length=sizeof tmp_buf;
2515
2516                         q=p;
2517                         /* Fix buf for TLS and beyond */
2518                         if (s->version > SSL3_VERSION)
2519                                 p+=2;
2520                         n=RSA_public_encrypt(sizeof tmp_buf,
2521                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2522 #ifdef PKCS1_CHECK
2523                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2524                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2525 #endif
2526                         if (n <= 0)
2527                                 {
2528                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2529                                 goto err;
2530                                 }
2531
2532                         /* Fix buf for TLS and beyond */
2533                         if (s->version > SSL3_VERSION)
2534                                 {
2535                                 s2n(n,q);
2536                                 n+=2;
2537                                 }
2538
2539                         s->session->master_key_length=
2540                                 s->method->ssl3_enc->generate_master_secret(s,
2541                                         s->session->master_key,
2542                                         tmp_buf,sizeof tmp_buf);
2543                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2544                         }
2545 #endif
2546 #ifndef OPENSSL_NO_KRB5
2547                 else if (alg_k & SSL_kKRB5)
2548                         {
2549                         krb5_error_code krb5rc;
2550                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2551                         /*  krb5_data   krb5_ap_req;  */
2552                         krb5_data       *enc_ticket;
2553                         krb5_data       authenticator, *authp = NULL;
2554                         EVP_CIPHER_CTX  ciph_ctx;
2555                         const EVP_CIPHER *enc = NULL;
2556                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2557                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2558                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2559                                                 + EVP_MAX_IV_LENGTH];
2560                         int             padl, outl = sizeof(epms);
2561
2562                         EVP_CIPHER_CTX_init(&ciph_ctx);
2563
2564 #ifdef KSSL_DEBUG
2565                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2566                                 alg_k, SSL_kKRB5);
2567 #endif  /* KSSL_DEBUG */
2568
2569                         authp = NULL;
2570 #ifdef KRB5SENDAUTH
2571                         if (KRB5SENDAUTH)  authp = &authenticator;
2572 #endif  /* KRB5SENDAUTH */
2573
2574                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2575                                 &kssl_err);
2576                         enc = kssl_map_enc(kssl_ctx->enctype);
2577                         if (enc == NULL)
2578                             goto err;
2579 #ifdef KSSL_DEBUG
2580                         {
2581                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2582                         if (krb5rc && kssl_err.text)
2583                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2584                         }
2585 #endif  /* KSSL_DEBUG */
2586
2587                         if (krb5rc)
2588                                 {
2589                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2590                                                 SSL_AD_HANDSHAKE_FAILURE);
2591                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2592                                                 kssl_err.reason);
2593                                 goto err;
2594                                 }
2595
2596                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2597                         **  in place of RFC 2712 KerberosWrapper, as in:
2598                         **
2599                         **  Send ticket (copy to *p, set n = length)
2600                         **  n = krb5_ap_req.length;
2601                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2602                         **  if (krb5_ap_req.data)
2603                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2604                         **
2605                         **  Now using real RFC 2712 KerberosWrapper
2606                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2607                         **  Note: 2712 "opaque" types are here replaced
2608                         **  with a 2-byte length followed by the value.
2609                         **  Example:
2610                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2611                         **  Where "xx xx" = length bytes.  Shown here with
2612                         **  optional authenticator omitted.
2613                         */
2614
2615                         /*  KerberosWrapper.Ticket              */
2616                         s2n(enc_ticket->length,p);
2617                         memcpy(p, enc_ticket->data, enc_ticket->length);
2618                         p+= enc_ticket->length;
2619                         n = enc_ticket->length + 2;
2620
2621                         /*  KerberosWrapper.Authenticator       */
2622                         if (authp  &&  authp->length)
2623                                 {
2624                                 s2n(authp->length,p);
2625                                 memcpy(p, authp->data, authp->length);
2626                                 p+= authp->length;
2627                                 n+= authp->length + 2;
2628
2629                                 free(authp->data);
2630                                 authp->data = NULL;
2631                                 authp->length = 0;
2632                                 }
2633                         else
2634                                 {
2635                                 s2n(0,p);/*  null authenticator length  */
2636                                 n+=2;
2637                                 }
2638
2639                             tmp_buf[0]=s->client_version>>8;
2640                             tmp_buf[1]=s->client_version&0xff;
2641                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2642                                 goto err;
2643
2644                         /*  20010420 VRS.  Tried it this way; failed.
2645                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2646                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2647                         **                              kssl_ctx->length);
2648                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2649                         */
2650
2651                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2652                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2653                                 kssl_ctx->key,iv);
2654                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2655                                 sizeof tmp_buf);
2656                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2657                         outl += padl;
2658                         if (outl > (int)sizeof epms)
2659                                 {
2660                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2661                                 goto err;
2662                                 }
2663                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2664
2665                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2666                         s2n(outl,p);
2667                         memcpy(p, epms, outl);
2668                         p+=outl;
2669                         n+=outl + 2;
2670
2671                         s->session->master_key_length=
2672                                 s->method->ssl3_enc->generate_master_secret(s,
2673                                         s->session->master_key,
2674                                         tmp_buf, sizeof tmp_buf);
2675
2676                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2677                         OPENSSL_cleanse(epms, outl);
2678                         }
2679 #endif
2680 #ifndef OPENSSL_NO_DH
2681                 else if (alg_k & (SSL_kDHE|SSL_kDHr|SSL_kDHd))
2682                         {
2683                         DH *dh_srvr,*dh_clnt;
2684                         SESS_CERT *scert = s->session->sess_cert;
2685
2686                         if (scert == NULL)
2687                                 {
2688                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2689                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2690                                 goto err;
2691                                 }
2692
2693                         if (scert->peer_dh_tmp != NULL)
2694                                 dh_srvr=scert->peer_dh_tmp;
2695                         else
2696                                 {
2697                                 /* we get them from the cert */
2698                                 int idx = scert->peer_cert_type;
2699                                 EVP_PKEY *spkey = NULL;
2700                                 dh_srvr = NULL;
2701                                 if (idx >= 0)
2702                                         spkey = X509_get_pubkey(
2703                                                 scert->peer_pkeys[idx].x509);
2704                                 if (spkey)
2705                                         {
2706                                         dh_srvr = EVP_PKEY_get1_DH(spkey);
2707                                         EVP_PKEY_free(spkey);
2708                                         }
2709                                 if (dh_srvr == NULL)
2710                                         {
2711                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2712                                             ERR_R_INTERNAL_ERROR);
2713                                         goto err;
2714                                         }
2715                                 }
2716                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2717                                 {
2718                                 /* Use client certificate key */
2719                                 EVP_PKEY *clkey = s->cert->key->privatekey;
2720                                 dh_clnt = NULL;
2721                                 if (clkey)
2722                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2723                                 if (dh_clnt == NULL)
2724                                         {
2725                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2726                                             ERR_R_INTERNAL_ERROR);
2727                                         goto err;
2728                                         }
2729                                 }
2730                         else
2731                                 {
2732                                 /* generate a new random key */
2733                                 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2734                                         {
2735                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2736                                         goto err;
2737                                         }
2738                                 if (!DH_generate_key(dh_clnt))
2739                                         {
2740                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2741                                         DH_free(dh_clnt);
2742                                         goto err;
2743                                         }
2744                                 }
2745
2746                         /* use the 'p' output buffer for the DH key, but
2747                          * make sure to clear it out afterwards */
2748
2749                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2750                         if (scert->peer_dh_tmp == NULL)
2751                                 DH_free(dh_srvr);
2752
2753                         if (n <= 0)
2754                                 {
2755                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2756                                 DH_free(dh_clnt);
2757                                 goto err;
2758                                 }
2759
2760                         /* generate master key from the result */
2761                         s->session->master_key_length=
2762                                 s->method->ssl3_enc->generate_master_secret(s,
2763                                         s->session->master_key,p,n);
2764                         /* clean up */
2765                         memset(p,0,n);
2766
2767                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2768                                 n = 0;
2769                         else
2770                                 {
2771                                 /* send off the data */
2772                                 n=BN_num_bytes(dh_clnt->pub_key);
2773                                 s2n(n,p);
2774                                 BN_bn2bin(dh_clnt->pub_key,p);
2775                                 n+=2;
2776                                 }
2777
2778                         DH_free(dh_clnt);
2779
2780                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2781                         }
2782 #endif
2783
2784 #ifndef OPENSSL_NO_ECDH
2785                 else if (alg_k & (SSL_kECDHE|SSL_kECDHr|SSL_kECDHe))
2786                         {
2787                         const EC_GROUP *srvr_group = NULL;
2788                         EC_KEY *tkey;
2789                         int ecdh_clnt_cert = 0;
2790                         int field_size = 0;
2791
2792                         if (s->session->sess_cert == NULL)
2793                                 {
2794                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2795                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2796                                 goto err;
2797                                 }
2798
2799                         /* Did we send out the client's
2800                          * ECDH share for use in premaster
2801                          * computation as part of client certificate?
2802                          * If so, set ecdh_clnt_cert to 1.
2803                          */
2804                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2805                                 {
2806                                 /* XXX: For now, we do not support client
2807                                  * authentication using ECDH certificates.
2808                                  * To add such support, one needs to add
2809                                  * code that checks for appropriate
2810                                  * conditions and sets ecdh_clnt_cert to 1.
2811                                  * For example, the cert have an ECC
2812                                  * key on the same curve as the server's
2813                                  * and the key should be authorized for
2814                                  * key agreement.
2815                                  *
2816                                  * One also needs to add code in ssl3_connect
2817                                  * to skip sending the certificate verify
2818                                  * message.
2819                                  *
2820                                  * if ((s->cert->key->privatekey != NULL) &&
2821                                  *     (s->cert->key->privatekey->type ==
2822                                  *      EVP_PKEY_EC) && ...)
2823                                  * ecdh_clnt_cert = 1;
2824                                  */
2825                                 }
2826
2827                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2828                                 {
2829                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2830                                 }
2831                         else
2832                                 {
2833                                 /* Get the Server Public Key from Cert */
2834                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2835                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2836                                 if ((srvr_pub_pkey == NULL) ||
2837                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2838                                     (srvr_pub_pkey->pkey.ec == NULL))
2839                                         {
2840                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2841                                             ERR_R_INTERNAL_ERROR);
2842                                         goto err;
2843                                         }
2844
2845                                 tkey = srvr_pub_pkey->pkey.ec;
2846                                 }
2847
2848                         srvr_group   = EC_KEY_get0_group(tkey);
2849                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2850
2851                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2852                                 {
2853                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2854                                     ERR_R_INTERNAL_ERROR);
2855                                 goto err;
2856                                 }
2857
2858                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2859                                 {
2860                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2861                                 goto err;
2862                                 }
2863
2864                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2865                                 {
2866                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2867                                 goto err;
2868                                 }
2869                         if (ecdh_clnt_cert)
2870                                 {
2871                                 /* Reuse key info from our certificate
2872                                  * We only need our private key to perform
2873                                  * the ECDH computation.
2874                                  */
2875                                 const BIGNUM *priv_key;
2876                                 tkey = s->cert->key->privatekey->pkey.ec;
2877                                 priv_key = EC_KEY_get0_private_key(tkey);
2878                                 if (priv_key == NULL)
2879                                         {
2880                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2881                                         goto err;
2882                                         }
2883                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2884                                         {
2885                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2886                                         goto err;
2887                                         }
2888                                 }
2889                         else
2890                                 {
2891                                 /* Generate a new ECDH key pair */
2892                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2893                                         {
2894                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2895                                         goto err;
2896                                         }
2897                                 }
2898
2899                         /* use the 'p' output buffer for the ECDH key, but
2900                          * make sure to clear it out afterwards
2901                          */
2902
2903                         field_size = EC_GROUP_get_degree(srvr_group);
2904                         if (field_size <= 0)
2905                                 {
2906                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2907                                        ERR_R_ECDH_LIB);
2908                                 goto err;
2909                                 }
2910                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2911                         if (n <= 0)
2912                                 {
2913                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2914                                        ERR_R_ECDH_LIB);
2915                                 goto err;
2916                                 }
2917
2918                         /* generate master key from the result */
2919                         s->session->master_key_length = s->method->ssl3_enc \
2920                             -> generate_master_secret(s,
2921                                 s->session->master_key,
2922                                 p, n);
2923
2924                         memset(p, 0, n); /* clean up */
2925
2926                         if (ecdh_clnt_cert)
2927                                 {
2928                                 /* Send empty client key exch message */
2929                                 n = 0;
2930                                 }
2931                         else
2932                                 {
2933                                 /* First check the size of encoding and
2934                                  * allocate memory accordingly.
2935                                  */
2936                                 encoded_pt_len =
2937                                     EC_POINT_point2oct(srvr_group,
2938                                         EC_KEY_get0_public_key(clnt_ecdh),
2939                                         POINT_CONVERSION_UNCOMPRESSED,
2940                                         NULL, 0, NULL);
2941
2942                                 encodedPoint = (unsigned char *)
2943                                     OPENSSL_malloc(encoded_pt_len *
2944                                         sizeof(unsigned char));
2945                                 bn_ctx = BN_CTX_new();
2946                                 if ((encodedPoint == NULL) ||
2947                                     (bn_ctx == NULL))
2948                                         {
2949                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2950                                         goto err;
2951                                         }
2952
2953                                 /* Encode the public key */
2954                                 n = EC_POINT_point2oct(srvr_group,
2955                                     EC_KEY_get0_public_key(clnt_ecdh),
2956                                     POINT_CONVERSION_UNCOMPRESSED,
2957                                     encodedPoint, encoded_pt_len, bn_ctx);
2958
2959                                 *p = n; /* length of encoded point */
2960                                 /* Encoded point will be copied here */
2961                                 p += 1;
2962                                 /* copy the point */
2963                                 memcpy((unsigned char *)p, encodedPoint, n);
2964                                 /* increment n to account for length field */
2965                                 n += 1;
2966                                 }
2967
2968                         /* Free allocated memory */
2969                         BN_CTX_free(bn_ctx);
2970                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2971                         if (clnt_ecdh != NULL)
2972                                  EC_KEY_free(clnt_ecdh);
2973                         EVP_PKEY_free(srvr_pub_pkey);
2974                         }
2975 #endif /* !OPENSSL_NO_ECDH */
2976                 else if (alg_k & SSL_kGOST)
2977                         {
2978                         /* GOST key exchange message creation */
2979                         EVP_PKEY_CTX *pkey_ctx;
2980                         X509 *peer_cert;
2981                         size_t msglen;
2982                         unsigned int md_len;
2983                         int keytype;
2984                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2985                         EVP_MD_CTX *ukm_hash;
2986                         EVP_PKEY *pub_key;
2987
2988                         /* Get server sertificate PKEY and create ctx from it */
2989                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2990                         if (!peer_cert)
2991                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2992                         if (!peer_cert)         {
2993                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2994                                         goto err;
2995                                 }
2996
2997                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2998                         /* If we have send a certificate, and certificate key
2999
3000                          * parameters match those of server certificate, use
3001                          * certificate key for key exchange
3002                          */
3003
3004                          /* Otherwise, generate ephemeral key pair */
3005
3006                         EVP_PKEY_encrypt_init(pkey_ctx);
3007                           /* Generate session key */
3008                     RAND_bytes(premaster_secret,32);
3009                         /* If we have client certificate, use its secret as peer key */
3010                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
3011                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
3012                                         /* If there was an error - just ignore it. Ephemeral key
3013                                         * would be used
3014                                         */
3015                                         ERR_clear_error();
3016                                 }
3017                         }
3018                         /* Compute shared IV and store it in algorithm-specific
3019                          * context data */
3020                         ukm_hash = EVP_MD_CTX_create();
3021                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
3022                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
3023                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
3024                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
3025                         EVP_MD_CTX_destroy(ukm_hash);
3026                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
3027                                 8,shared_ukm)<0) {
3028                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3029                                                 SSL_R_LIBRARY_BUG);
3030                                         goto err;
3031                                 }
3032                         /* Make GOST keytransport blob message */
3033                         /*Encapsulate it into sequence */
3034                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
3035                         msglen=255;
3036                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
3037                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3038                                         SSL_R_LIBRARY_BUG);
3039                                 goto err;
3040                         }
3041                         if (msglen >= 0x80)
3042                                 {
3043                                 *(p++)=0x81;
3044                                 *(p++)= msglen & 0xff;
3045                                 n=msglen+3;
3046                                 }
3047                         else
3048                                 {
3049                                 *(p++)= msglen & 0xff;
3050                                 n=msglen+2;
3051                                 }
3052                         memcpy(p, tmp, msglen);
3053                         /* Check if pubkey from client certificate was used */
3054                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
3055                                 {
3056                                 /* Set flag "skip certificate verify" */
3057                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3058                                 }
3059                         EVP_PKEY_CTX_free(pkey_ctx);
3060                         s->session->master_key_length=
3061                                 s->method->ssl3_enc->generate_master_secret(s,
3062                                         s->session->master_key,premaster_secret,32);
3063                         EVP_PKEY_free(pub_key);
3064
3065                         }
3066 #ifndef OPENSSL_NO_SRP
3067                 else if (alg_k & SSL_kSRP)
3068                         {
3069                         if (s->srp_ctx.A != NULL)
3070                                 {
3071                                 /* send off the data */
3072                                 n=BN_num_bytes(s->srp_ctx.A);
3073                                 s2n(n,p);
3074                                 BN_bn2bin(s->srp_ctx.A,p);
3075                                 n+=2;
3076                                 }
3077                         else
3078                                 {
3079                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3080                                 goto err;
3081                                 }
3082                         if (s->session->srp_username != NULL)
3083                                 OPENSSL_free(s->session->srp_username);
3084                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
3085                         if (s->session->srp_username == NULL)
3086                                 {
3087                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3088                                         ERR_R_MALLOC_FAILURE);
3089                                 goto err;
3090                                 }
3091
3092                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
3093                                 {
3094                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3095                                 goto err;
3096                                 }
3097                         }
3098 #endif
3099 #ifndef OPENSSL_NO_PSK
3100                 else if (alg_k & SSL_kPSK)
3101                         {
3102                         /* The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes
3103                          * to return a \0-terminated identity. The last byte
3104                          * is for us for simulating strnlen. */
3105                         char identity[PSK_MAX_IDENTITY_LEN + 2];
3106                         size_t identity_len;
3107                         unsigned char *t = NULL;
3108                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
3109                         unsigned int pre_ms_len = 0, psk_len = 0;
3110                         int psk_err = 1;
3111
3112                         n = 0;
3113                         if (s->psk_client_callback == NULL)
3114                                 {
3115                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3116                                         SSL_R_PSK_NO_CLIENT_CB);
3117                                 goto err;
3118                                 }
3119
3120                         memset(identity, 0, sizeof(identity));
3121                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
3122                                 identity, sizeof(identity) - 1,
3123                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
3124                         if (psk_len > PSK_MAX_PSK_LEN)
3125                                 {
3126                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3127                                         ERR_R_INTERNAL_ERROR);
3128                                 goto psk_err;
3129                                 }
3130                         else if (psk_len == 0)
3131                                 {
3132                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3133                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
3134                                 goto psk_err;
3135                                 }
3136                         identity[PSK_MAX_IDENTITY_LEN + 1] = '\0';
3137                         identity_len = strlen(identity);
3138                         if (identity_len > PSK_MAX_IDENTITY_LEN)
3139                                 {
3140                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3141                                         ERR_R_INTERNAL_ERROR);
3142                                 goto psk_err;
3143                                 }
3144                         /* create PSK pre_master_secret */
3145                         pre_ms_len = 2+psk_len+2+psk_len;
3146                         t = psk_or_pre_ms;
3147                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
3148                         s2n(psk_len, t);
3149                         memset(t, 0, psk_len);
3150                         t+=psk_len;
3151                         s2n(psk_len, t);
3152
3153                         if (s->session->psk_identity_hint != NULL)
3154                                 OPENSSL_free(s->session->psk_identity_hint);
3155                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
3156                         if (s->ctx->psk_identity_hint != NULL &&
3157                                 s->session->psk_identity_hint == NULL)
3158                                 {
3159                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3160                                         ERR_R_MALLOC_FAILURE);
3161                                 goto psk_err;
3162                                 }
3163
3164                         if (s->session->psk_identity != NULL)
3165                                 OPENSSL_free(s->session->psk_identity);
3166                         s->session->psk_identity = BUF_strdup(identity);
3167                         if (s->session->psk_identity == NULL)
3168                                 {
3169                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3170                                         ERR_R_MALLOC_FAILURE);
3171                                 goto psk_err;
3172                                 }
3173
3174                         s->session->master_key_length =
3175                                 s->method->ssl3_enc->generate_master_secret(s,
3176                                         s->session->master_key,
3177                                         psk_or_pre_ms, pre_ms_len);
3178                         s2n(identity_len, p);
3179                         memcpy(p, identity, identity_len);
3180                         n = 2 + identity_len;
3181                         psk_err = 0;
3182                 psk_err:
3183                         OPENSSL_cleanse(identity, sizeof(identity));
3184                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
3185                         if (psk_err != 0)
3186                                 {
3187                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3188                                 goto err;
3189                                 }
3190                         }
3191 #endif
3192                 else
3193                         {
3194                         ssl3_send_alert(s, SSL3_AL_FATAL,
3195                             SSL_AD_HANDSHAKE_FAILURE);
3196                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3197                             ERR_R_INTERNAL_ERROR);
3198                         goto err;
3199                         }
3200
3201                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_KEY_EXCHANGE, n);
3202                 s->state=SSL3_ST_CW_KEY_EXCH_B;
3203                 }
3204
3205         /* SSL3_ST_CW_KEY_EXCH_B */
3206         return ssl_do_write(s);
3207 err:
3208 #ifndef OPENSSL_NO_ECDH
3209         BN_CTX_free(bn_ctx);
3210         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
3211         if (clnt_ecdh != NULL)
3212                 EC_KEY_free(clnt_ecdh);
3213         EVP_PKEY_free(srvr_pub_pkey);
3214 #endif
3215         return(-1);
3216         }
3217
3218 int ssl3_send_client_verify(SSL *s)
3219         {
3220         unsigned char *p;
3221         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
3222         EVP_PKEY *pkey;
3223         EVP_PKEY_CTX *pctx=NULL;
3224         EVP_MD_CTX mctx;
3225         unsigned u=0;
3226         unsigned long n;
3227         int j;
3228
3229         EVP_MD_CTX_init(&mctx);
3230
3231         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
3232                 {
3233                 p= ssl_handshake_start(s);
3234                 pkey=s->cert->key->privatekey;
3235 /* Create context from key and test if sha1 is allowed as digest */
3236                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
3237                 EVP_PKEY_sign_init(pctx);
3238                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
3239                         {
3240                         if (!SSL_USE_SIGALGS(s))
3241                                 s->method->ssl3_enc->cert_verify_mac(s,
3242                                                 NID_sha1,
3243                                                 &(data[MD5_DIGEST_LENGTH]));
3244                         }
3245                 else
3246                         {
3247                         ERR_clear_error();
3248                         }
3249                 /* For TLS v1.2 send signature algorithm and signature
3250                  * using agreed digest and cached handshake records.
3251                  */
3252                 if (SSL_USE_SIGALGS(s))
3253                         {
3254                         long hdatalen = 0;
3255                         void *hdata;
3256                         const EVP_MD *md = s->cert->key->digest;
3257                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
3258                                                                 &hdata);
3259                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
3260                                 {
3261                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3262                                                 ERR_R_INTERNAL_ERROR);
3263                                 goto err;
3264                                 }
3265                         p += 2;
3266 #ifdef SSL_DEBUG
3267                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3268                                                         EVP_MD_name(md));
3269 #endif
3270                         if (!EVP_SignInit_ex(&mctx, md, NULL)
3271                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3272                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
3273                                 {
3274                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3275                                                 ERR_R_EVP_LIB);
3276                                 goto err;
3277                                 }
3278                         s2n(u,p);
3279                         n = u + 4;
3280                         if (!ssl3_digest_cached_records(s))
3281                                 goto err;
3282                         }
3283                 else
3284 #ifndef OPENSSL_NO_RSA
3285                 if (pkey->type == EVP_PKEY_RSA)
3286                         {
3287                         s->method->ssl3_enc->cert_verify_mac(s,
3288                                 NID_md5,
3289                                 &(data[0]));
3290                         if (RSA_sign(NID_md5_sha1, data,
3291                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
3292                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3293                                 {
3294                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3295                                 goto err;
3296                                 }
3297                         s2n(u,p);
3298                         n=u+2;
3299                         }
3300                 else
3301 #endif
3302 #ifndef OPENSSL_NO_DSA
3303                         if (pkey->type == EVP_PKEY_DSA)
3304                         {
3305                         if (!DSA_sign(pkey->save_type,
3306                                 &(data[MD5_DIGEST_LENGTH]),
3307                                 SHA_DIGEST_LENGTH,&(p[2]),
3308                                 (unsigned int *)&j,pkey->pkey.dsa))
3309                                 {
3310                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3311                                 goto err;
3312                                 }
3313                         s2n(j,p);
3314                         n=j+2;
3315                         }
3316                 else
3317 #endif
3318 #ifndef OPENSSL_NO_ECDSA
3319                         if (pkey->type == EVP_PKEY_EC)
3320                         {
3321                         if (!ECDSA_sign(pkey->save_type,
3322                                 &(data[MD5_DIGEST_LENGTH]),
3323                                 SHA_DIGEST_LENGTH,&(p[2]),
3324                                 (unsigned int *)&j,pkey->pkey.ec))
3325                                 {
3326                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3327                                     ERR_R_ECDSA_LIB);
3328                                 goto err;
3329                                 }
3330                         s2n(j,p);
3331                         n=j+2;
3332                         }
3333                 else
3334 #endif
3335                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3336                 {
3337                 unsigned char signbuf[64];
3338                 int i;
3339                 size_t sigsize=64;
3340                 s->method->ssl3_enc->cert_verify_mac(s,
3341                         NID_id_GostR3411_94,
3342                         data);
3343                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3344                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3345                         ERR_R_INTERNAL_ERROR);
3346                         goto err;
3347                 }
3348                 for (i=63,j=0; i>=0; j++, i--) {
3349                         p[2+j]=signbuf[i];
3350                 }
3351                 s2n(j,p);
3352                 n=j+2;
3353                 }
3354                 else
3355                 {
3356                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3357                         goto err;
3358                 }
3359                 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_VERIFY, n);
3360                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3361                 }
3362         EVP_MD_CTX_cleanup(&mctx);
3363         EVP_PKEY_CTX_free(pctx);
3364         return ssl_do_write(s);
3365 err:
3366         EVP_MD_CTX_cleanup(&mctx);
3367         EVP_PKEY_CTX_free(pctx);
3368         return(-1);
3369         }
3370
3371 /* Check a certificate can be used for client authentication. Currently
3372  * check cert exists, if we have a suitable digest for TLS 1.2 if
3373  * static DH client certificates can be used and optionally checks
3374  * suitability for Suite B.
3375  */
3376 static int ssl3_check_client_certificate(SSL *s)
3377         {
3378         unsigned long alg_k;
3379         if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3380                 return 0;
3381         /* If no suitable signature algorithm can't use certificate */
3382         if (SSL_USE_SIGALGS(s) && !s->cert->key->digest)
3383                 return 0;
3384         /* If strict mode check suitability of chain before using it.
3385          * This also adjusts suite B digest if necessary.
3386          */
3387         if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
3388                 !tls1_check_chain(s, NULL, NULL, NULL, -2))
3389                 return 0;
3390         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3391         /* See if we can use client certificate for fixed DH */
3392         if (alg_k & (SSL_kDHr|SSL_kDHd))
3393                 {
3394                 SESS_CERT *scert = s->session->sess_cert;
3395                 int i = scert->peer_cert_type;
3396                 EVP_PKEY *clkey = NULL, *spkey = NULL;
3397                 clkey = s->cert->key->privatekey;
3398                 /* If client key not DH assume it can be used */
3399                 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3400                         return 1;
3401                 if (i >= 0)
3402                         spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
3403                 if (spkey)
3404                         {
3405                         /* Compare server and client parameters */
3406                         i = EVP_PKEY_cmp_parameters(clkey, spkey);
3407                         EVP_PKEY_free(spkey);
3408                         if (i != 1)
3409                                 return 0;
3410                         }
3411                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3412                 }
3413         return 1;
3414         }
3415
3416 int ssl3_send_client_certificate(SSL *s)
3417         {
3418         X509 *x509=NULL;
3419         EVP_PKEY *pkey=NULL;
3420         int i;
3421
3422         if (s->state == SSL3_ST_CW_CERT_A)
3423                 {
3424                 /* Let cert callback update client certificates if required */
3425                 if (s->cert->cert_cb)
3426                         {
3427                         i = s->cert->cert_cb(s, s->cert->cert_cb_arg);
3428                         if (i < 0)
3429                                 {
3430                                 s->rwstate=SSL_X509_LOOKUP;
3431                                 return -1;
3432                                 }
3433                         if (i == 0)
3434                                 {
3435                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
3436                                 return 0;
3437                                 }
3438                         s->rwstate=SSL_NOTHING;
3439                         }
3440                 if (ssl3_check_client_certificate(s))
3441                         s->state=SSL3_ST_CW_CERT_C;
3442                 else
3443                         s->state=SSL3_ST_CW_CERT_B;
3444                 }
3445
3446         /* We need to get a client cert */
3447         if (s->state == SSL3_ST_CW_CERT_B)
3448                 {
3449                 /* If we get an error, we need to
3450                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3451                  * We then get retied later */
3452                 i=0;
3453                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3454                 if (i < 0)
3455                         {
3456                         s->rwstate=SSL_X509_LOOKUP;
3457                         return(-1);
3458                         }
3459                 s->rwstate=SSL_NOTHING;
3460                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3461                         {
3462                         s->state=SSL3_ST_CW_CERT_B;
3463                         if (    !SSL_use_certificate(s,x509) ||
3464                                 !SSL_use_PrivateKey(s,pkey))
3465                                 i=0;
3466                         }
3467                 else if (i == 1)
3468                         {
3469                         i=0;
3470                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3471                         }
3472
3473                 if (x509 != NULL) X509_free(x509);
3474                 if (pkey != NULL) EVP_PKEY_free(pkey);
3475                 if (i && !ssl3_check_client_certificate(s))
3476                         i = 0;
3477                 if (i == 0)
3478                         {
3479                         if (s->version == SSL3_VERSION)
3480                                 {
3481                                 s->s3->tmp.cert_req=0;
3482                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3483                                 return(1);
3484                                 }
3485                         else
3486                                 {
3487                                 s->s3->tmp.cert_req=2;
3488                                 }
3489                         }
3490
3491                 /* Ok, we have a cert */
3492                 s->state=SSL3_ST_CW_CERT_C;
3493                 }
3494
3495         if (s->state == SSL3_ST_CW_CERT_C)
3496                 {
3497                 s->state=SSL3_ST_CW_CERT_D;
3498                 if (!ssl3_output_cert_chain(s,
3499                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key))
3500                         {
3501                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR);
3502                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
3503                         return 0;
3504                         }
3505                 }
3506         /* SSL3_ST_CW_CERT_D */
3507         return ssl_do_write(s);
3508         }
3509
3510 #define has_bits(i,m)   (((i)&(m)) == (m))
3511
3512 int ssl3_check_cert_and_algorithm(SSL *s)
3513         {
3514         int i,idx;
3515         long alg_k,alg_a;
3516         EVP_PKEY *pkey=NULL;
3517         SESS_CERT *sc;
3518 #ifndef OPENSSL_NO_RSA
3519         RSA *rsa;
3520 #endif
3521 #ifndef OPENSSL_NO_DH
3522         DH *dh;
3523 #endif
3524
3525         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3526         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3527
3528         /* we don't have a certificate */
3529         if ((alg_a & (SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3530                 return(1);
3531
3532         sc=s->session->sess_cert;
3533         if (sc == NULL)
3534                 {
3535                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3536                 goto err;
3537                 }
3538
3539 #ifndef OPENSSL_NO_RSA
3540         rsa=s->session->sess_cert->peer_rsa_tmp;
3541 #endif
3542 #ifndef OPENSSL_NO_DH
3543         dh=s->session->sess_cert->peer_dh_tmp;
3544 #endif
3545
3546         /* This is the passed certificate */
3547
3548         idx=sc->peer_cert_type;
3549 #ifndef OPENSSL_NO_ECDH
3550         if (idx == SSL_PKEY_ECC)
3551                 {
3552                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3553                                                                 s) == 0)
3554                         { /* check failed */
3555                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3556                         goto f_err;
3557                         }
3558                 else
3559                         {
3560                         return 1;
3561                         }
3562                 }
3563         else if (alg_a & SSL_aECDSA)
3564                 {
3565                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDSA_SIGNING_CERT);
3566                 goto f_err;
3567                 }
3568         else if (alg_k & (SSL_kECDHr|SSL_kECDHe))
3569                 {
3570                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDH_CERT);
3571                 goto f_err;
3572                 }
3573 #endif
3574         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3575         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3576         EVP_PKEY_free(pkey);
3577
3578
3579         /* Check that we have a certificate if we require one */
3580         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3581                 {
3582                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3583                 goto f_err;
3584                 }
3585 #ifndef OPENSSL_NO_DSA
3586         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3587                 {
3588                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3589                 goto f_err;
3590                 }
3591 #endif
3592 #ifndef OPENSSL_NO_RSA
3593         if ((alg_k & SSL_kRSA) &&
3594                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3595                 {
3596                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3597                 goto f_err;
3598                 }
3599 #endif
3600 #ifndef OPENSSL_NO_DH
3601         if ((alg_k & SSL_kDHE) &&
3602                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3603                 {
3604                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3605                 goto f_err;
3606                 }
3607         else if ((alg_k & SSL_kDHr) && !SSL_USE_SIGALGS(s) &&
3608                 !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3609                 {
3610                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3611                 goto f_err;
3612                 }
3613 #ifndef OPENSSL_NO_DSA
3614         else if ((alg_k & SSL_kDHd) && !SSL_USE_SIGALGS(s) &&
3615                 !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3616                 {
3617                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3618                 goto f_err;
3619                 }
3620 #endif
3621 #endif
3622
3623         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3624                 {
3625 #ifndef OPENSSL_NO_RSA
3626                 if (alg_k & SSL_kRSA)
3627                         {
3628                         if (rsa == NULL
3629                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3630                                 {
3631                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3632                                 goto f_err;
3633                                 }
3634                         }
3635                 else
3636 #endif
3637 #ifndef OPENSSL_NO_DH
3638                         if (alg_k & (SSL_kDHE|SSL_kDHr|SSL_kDHd))
3639                             {
3640                             if (dh == NULL
3641                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3642                                 {
3643                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3644                                 goto f_err;
3645                                 }
3646                         }
3647                 else
3648 #endif
3649                         {
3650                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3651                         goto f_err;
3652                         }
3653                 }
3654         return(1);
3655 f_err:
3656         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3657 err:
3658         return(0);
3659         }
3660
3661 /* Check to see if handshake is full or resumed. Usually this is just a
3662  * case of checking to see if a cache hit has occurred. In the case of
3663  * session tickets we have to check the next message to be sure.
3664  */
3665
3666 #ifndef OPENSSL_NO_TLSEXT
3667 # ifndef OPENSSL_NO_NEXTPROTONEG
3668 int ssl3_send_next_proto(SSL *s)
3669         {
3670         unsigned int len, padding_len;
3671         unsigned char *d;
3672
3673         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3674                 {
3675                 len = s->next_proto_negotiated_len;
3676                 padding_len = 32 - ((len + 2) % 32);
3677                 d = (unsigned char *)s->init_buf->data;
3678                 d[4] = len;
3679                 memcpy(d + 5, s->next_proto_negotiated, len);
3680                 d[5 + len] = padding_len;
3681                 memset(d + 6 + len, 0, padding_len);
3682                 *(d++)=SSL3_MT_NEXT_PROTO;
3683                 l2n3(2 + len + padding_len, d);
3684                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3685                 s->init_num = 4 + 2 + len + padding_len;
3686                 s->init_off = 0;
3687                 }
3688
3689         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3690         }
3691 # endif
3692 #endif
3693
3694 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3695         {
3696         int i = 0;
3697 #ifndef OPENSSL_NO_ENGINE
3698         if (s->ctx->client_cert_engine)
3699                 {
3700                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3701                                                 SSL_get_client_CA_list(s),
3702                                                 px509, ppkey, NULL, NULL, NULL);
3703                 if (i != 0)
3704                         return i;
3705                 }
3706 #endif
3707         if (s->ctx->client_cert_cb)
3708                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3709         return i;
3710         }