crypto/openssl/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 #ifdef OPENSSL_FIPS
 160 #include <openssl/fips.h>
 161 #endif
 162 #ifndef OPENSSL_NO_DH
 163 #include <openssl/dh.h>
 164 #endif
 165 #include <openssl/bn.h>
 166 #ifndef OPENSSL_NO_ENGINE
 167 #include <openssl/engine.h>
 168 #endif
 169
 170 static const SSL_METHOD *ssl3_get_client_method(int ver);
 171 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 172
 173 static const SSL_METHOD *ssl3_get_client_method(int ver)
 174         {
 175         if (ver == SSL3_VERSION)
 176                 return(SSLv3_client_method());
 177         else
 178                 return(NULL);
 179         }
 180
 181 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 182                         ssl_undefined_function,
 183                         ssl3_connect,
 184                         ssl3_get_client_method)
 185
 186 int ssl3_connect(SSL *s)
 187         {
 188         BUF_MEM *buf=NULL;
 189         unsigned long Time=(unsigned long)time(NULL);
 190         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 191         int ret= -1;
 192         int new_state,state,skip=0;
 193
 194         RAND_add(&Time,sizeof(Time),0);
 195         ERR_clear_error();
 196         clear_sys_error();
 197
 198         if (s->info_callback != NULL)
 199                 cb=s->info_callback;
 200         else if (s->ctx->info_callback != NULL)
 201                 cb=s->ctx->info_callback;
 202
 203         s->in_handshake++;
 204         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 205
 206 #ifndef OPENSSL_NO_HEARTBEATS
 207         /* If we're awaiting a HeartbeatResponse, pretend we
 208          * already got and don't await it anymore, because
 209          * Heartbeats don't make sense during handshakes anyway.
 210          */
 211         if (s->tlsext_hb_pending)
 212                 {
 213                 s->tlsext_hb_pending = 0;
 214                 s->tlsext_hb_seq++;
 215                 }
 216 #endif
 217
 218         for (;;)
 219                 {
 220                 state=s->state;
 221
 222                 switch(s->state)
 223                         {
 224                 case SSL_ST_RENEGOTIATE:
 225                         s->renegotiate=1;
 226                         s->state=SSL_ST_CONNECT;
 227                         s->ctx->stats.sess_connect_renegotiate++;
 228                         /* break */
 229                 case SSL_ST_BEFORE:
 230                 case SSL_ST_CONNECT:
 231                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 232                 case SSL_ST_OK|SSL_ST_CONNECT:
 233
 234                         s->server=0;
 235                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 236
 237                         if ((s->version & 0xff00 ) != 0x0300)
 238                                 {
 239                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 240                                 ret = -1;
 241                                 goto end;
 242                                 }
 243
 244                         /* s->version=SSL3_VERSION; */
 245                         s->type=SSL_ST_CONNECT;
 246
 247                         if (s->init_buf == NULL)
 248                                 {
 249                                 if ((buf=BUF_MEM_new()) == NULL)
 250                                         {
 251                                         ret= -1;
 252                                         goto end;
 253                                         }
 254                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 255                                         {
 256                                         ret= -1;
 257                                         goto end;
 258                                         }
 259                                 s->init_buf=buf;
 260                                 buf=NULL;
 261                                 }
 262
 263                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 264
 265                         /* setup buffing BIO */
 266                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 267
 268                         /* don't push the buffering BIO quite yet */
 269
 270                         ssl3_init_finished_mac(s);
 271
 272                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 273                         s->ctx->stats.sess_connect++;
 274                         s->init_num=0;
 275                         break;
 276
 277                 case SSL3_ST_CW_CLNT_HELLO_A:
 278                 case SSL3_ST_CW_CLNT_HELLO_B:
 279
 280                         s->shutdown=0;
 281                         ret=ssl3_client_hello(s);
 282                         if (ret <= 0) goto end;
 283                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 284                         s->init_num=0;
 285
 286                         /* turn on buffering for the next lot of output */
 287                         if (s->bbio != s->wbio)
 288                                 s->wbio=BIO_push(s->bbio,s->wbio);
 289
 290                         break;
 291
 292                 case SSL3_ST_CR_SRVR_HELLO_A:
 293                 case SSL3_ST_CR_SRVR_HELLO_B:
 294                         ret=ssl3_get_server_hello(s);
 295                         if (ret <= 0) goto end;
 296
 297                         if (s->hit)
 298                                 {
 299                                 s->state=SSL3_ST_CR_FINISHED_A;
 300 #ifndef OPENSSL_NO_TLSEXT
 301                                 if (s->tlsext_ticket_expected)
 302                                         {
 303                                         /* receive renewed session ticket */
 304                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 305                                         }
 306 #endif
 307                                 }
 308                         else
 309                                 s->state=SSL3_ST_CR_CERT_A;
 310                         s->init_num=0;
 311                         break;
 312
 313                 case SSL3_ST_CR_CERT_A:
 314                 case SSL3_ST_CR_CERT_B:
 315 #ifndef OPENSSL_NO_TLSEXT
 316                         ret=ssl3_check_finished(s);
 317                         if (ret <= 0) goto end;
 318                         if (ret == 2)
 319                                 {
 320                                 s->hit = 1;
 321                                 if (s->tlsext_ticket_expected)
 322                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 323                                 else
 324                                         s->state=SSL3_ST_CR_FINISHED_A;
 325                                 s->init_num=0;
 326                                 break;
 327                                 }
 328 #endif
 329                         /* Check if it is anon DH/ECDH, SRP auth */
 330                         /* or PSK */
 331                         if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP)) &&
 332                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 333                                 {
 334                                 ret=ssl3_get_server_certificate(s);
 335                                 if (ret <= 0) goto end;
 336 #ifndef OPENSSL_NO_TLSEXT
 337                                 if (s->tlsext_status_expected)
 338                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 339                                 else
 340                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 341                                 }
 342                         else
 343                                 {
 344                                 skip = 1;
 345                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 346                                 }
 347 #else
 348                                 }
 349                         else
 350                                 skip=1;
 351
 352                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 353 #endif
 354                         s->init_num=0;
 355                         break;
 356
 357                 case SSL3_ST_CR_KEY_EXCH_A:
 358                 case SSL3_ST_CR_KEY_EXCH_B:
 359                         ret=ssl3_get_key_exchange(s);
 360                         if (ret <= 0) goto end;
 361                         s->state=SSL3_ST_CR_CERT_REQ_A;
 362                         s->init_num=0;
 363
 364                         /* at this point we check that we have the
 365                          * required stuff from the server */
 366                         if (!ssl3_check_cert_and_algorithm(s))
 367                                 {
 368                                 ret= -1;
 369                                 goto end;
 370                                 }
 371                         break;
 372
 373                 case SSL3_ST_CR_CERT_REQ_A:
 374                 case SSL3_ST_CR_CERT_REQ_B:
 375                         ret=ssl3_get_certificate_request(s);
 376                         if (ret <= 0) goto end;
 377                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 378                         s->init_num=0;
 379                         break;
 380
 381                 case SSL3_ST_CR_SRVR_DONE_A:
 382                 case SSL3_ST_CR_SRVR_DONE_B:
 383                         ret=ssl3_get_server_done(s);
 384                         if (ret <= 0) goto end;
 385 #ifndef OPENSSL_NO_SRP
 386                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
 387                                 {
 388                                 if ((ret = SRP_Calc_A_param(s))<=0)
 389                                         {
 390                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
 391                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
 392                                         goto end;
 393                                         }
 394                                 }
 395 #endif
 396                         if (s->s3->tmp.cert_req)
 397                                 s->state=SSL3_ST_CW_CERT_A;
 398                         else
 399                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 400                         s->init_num=0;
 401
 402                         break;
 403
 404                 case SSL3_ST_CW_CERT_A:
 405                 case SSL3_ST_CW_CERT_B:
 406                 case SSL3_ST_CW_CERT_C:
 407                 case SSL3_ST_CW_CERT_D:
 408                         ret=ssl3_send_client_certificate(s);
 409                         if (ret <= 0) goto end;
 410                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 411                         s->init_num=0;
 412                         break;
 413
 414                 case SSL3_ST_CW_KEY_EXCH_A:
 415                 case SSL3_ST_CW_KEY_EXCH_B:
 416                         ret=ssl3_send_client_key_exchange(s);
 417                         if (ret <= 0) goto end;
 418                         /* EAY EAY EAY need to check for DH fix cert
 419                          * sent back */
 420                         /* For TLS, cert_req is set to 2, so a cert chain
 421                          * of nothing is sent, but no verify packet is sent */
 422                         /* XXX: For now, we do not support client
 423                          * authentication in ECDH cipher suites with
 424                          * ECDH (rather than ECDSA) certificates.
 425                          * We need to skip the certificate verify
 426                          * message when client's ECDH public key is sent
 427                          * inside the client certificate.
 428                          */
 429                         if (s->s3->tmp.cert_req == 1)
 430                                 {
 431                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 432                                 }
 433                         else
 434                                 {
 435                                 s->state=SSL3_ST_CW_CHANGE_A;
 436                                 s->s3->change_cipher_spec=0;
 437                                 }
 438                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 439                                 {
 440                                 s->state=SSL3_ST_CW_CHANGE_A;
 441                                 s->s3->change_cipher_spec=0;
 442                                 }
 443
 444                         s->init_num=0;
 445                         break;
 446
 447                 case SSL3_ST_CW_CERT_VRFY_A:
 448                 case SSL3_ST_CW_CERT_VRFY_B:
 449                         ret=ssl3_send_client_verify(s);
 450                         if (ret <= 0) goto end;
 451                         s->state=SSL3_ST_CW_CHANGE_A;
 452                         s->init_num=0;
 453                         s->s3->change_cipher_spec=0;
 454                         break;
 455
 456                 case SSL3_ST_CW_CHANGE_A:
 457                 case SSL3_ST_CW_CHANGE_B:
 458                         ret=ssl3_send_change_cipher_spec(s,
 459                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 460                         if (ret <= 0) goto end;
 461
 462 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 463                         s->state=SSL3_ST_CW_FINISHED_A;
 464 #else
 465                         if (s->s3->next_proto_neg_seen)
 466                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
 467                         else
 468                                 s->state=SSL3_ST_CW_FINISHED_A;
 469 #endif
 470                         s->init_num=0;
 471
 472                         s->session->cipher=s->s3->tmp.new_cipher;
 473 #ifdef OPENSSL_NO_COMP
 474                         s->session->compress_meth=0;
 475 #else
 476                         if (s->s3->tmp.new_compression == NULL)
 477                                 s->session->compress_meth=0;
 478                         else
 479                                 s->session->compress_meth=
 480                                         s->s3->tmp.new_compression->id;
 481 #endif
 482                         if (!s->method->ssl3_enc->setup_key_block(s))
 483                                 {
 484                                 ret= -1;
 485                                 goto end;
 486                                 }
 487
 488                         if (!s->method->ssl3_enc->change_cipher_state(s,
 489                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 490                                 {
 491                                 ret= -1;
 492                                 goto end;
 493                                 }
 494
 495                         break;
 496
 497 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 498                 case SSL3_ST_CW_NEXT_PROTO_A:
 499                 case SSL3_ST_CW_NEXT_PROTO_B:
 500                         ret=ssl3_send_next_proto(s);
 501                         if (ret <= 0) goto end;
 502                         s->state=SSL3_ST_CW_FINISHED_A;
 503                         break;
 504 #endif
 505
 506                 case SSL3_ST_CW_FINISHED_A:
 507                 case SSL3_ST_CW_FINISHED_B:
 508                         ret=ssl3_send_finished(s,
 509                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 510                                 s->method->ssl3_enc->client_finished_label,
 511                                 s->method->ssl3_enc->client_finished_label_len);
 512                         if (ret <= 0) goto end;
 513                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 514                         s->state=SSL3_ST_CW_FLUSH;
 515
 516                         /* clear flags */
 517                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 518                         if (s->hit)
 519                                 {
 520                                 s->s3->tmp.next_state=SSL_ST_OK;
 521                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 522                                         {
 523                                         s->state=SSL_ST_OK;
 524                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 525                                         s->s3->delay_buf_pop_ret=0;
 526                                         }
 527                                 }
 528                         else
 529                                 {
 530 #ifndef OPENSSL_NO_TLSEXT
 531                                 /* Allow NewSessionTicket if ticket expected */
 532                                 if (s->tlsext_ticket_expected)
 533                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 534                                 else
 535 #endif
 536
 537                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 538                                 }
 539                         s->init_num=0;
 540                         break;
 541
 542 #ifndef OPENSSL_NO_TLSEXT
 543                 case SSL3_ST_CR_SESSION_TICKET_A:
 544                 case SSL3_ST_CR_SESSION_TICKET_B:
 545                         ret=ssl3_get_new_session_ticket(s);
 546                         if (ret <= 0) goto end;
 547                         s->state=SSL3_ST_CR_FINISHED_A;
 548                         s->init_num=0;
 549                 break;
 550
 551                 case SSL3_ST_CR_CERT_STATUS_A:
 552                 case SSL3_ST_CR_CERT_STATUS_B:
 553                         ret=ssl3_get_cert_status(s);
 554                         if (ret <= 0) goto end;
 555                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 556                         s->init_num=0;
 557                 break;
 558 #endif
 559
 560                 case SSL3_ST_CR_FINISHED_A:
 561                 case SSL3_ST_CR_FINISHED_B:
 562
 563                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 564                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 565                                 SSL3_ST_CR_FINISHED_B);
 566                         if (ret <= 0) goto end;
 567
 568                         if (s->hit)
 569                                 s->state=SSL3_ST_CW_CHANGE_A;
 570                         else
 571                                 s->state=SSL_ST_OK;
 572                         s->init_num=0;
 573                         break;
 574
 575                 case SSL3_ST_CW_FLUSH:
 576                         s->rwstate=SSL_WRITING;
 577                         if (BIO_flush(s->wbio) <= 0)
 578                                 {
 579                                 ret= -1;
 580                                 goto end;
 581                                 }
 582                         s->rwstate=SSL_NOTHING;
 583                         s->state=s->s3->tmp.next_state;
 584                         break;
 585
 586                 case SSL_ST_OK:
 587                         /* clean a few things up */
 588                         ssl3_cleanup_key_block(s);
 589
 590                         if (s->init_buf != NULL)
 591                                 {
 592                                 BUF_MEM_free(s->init_buf);
 593                                 s->init_buf=NULL;
 594                                 }
 595
 596                         /* If we are not 'joining' the last two packets,
 597                          * remove the buffering now */
 598                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 599                                 ssl_free_wbio_buffer(s);
 600                         /* else do it later in ssl3_write */
 601
 602                         s->init_num=0;
 603                         s->renegotiate=0;
 604                         s->new_session=0;
 605
 606                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 607                         if (s->hit) s->ctx->stats.sess_hit++;
 608
 609                         ret=1;
 610                         /* s->server=0; */
 611                         s->handshake_func=ssl3_connect;
 612                         s->ctx->stats.sess_connect_good++;
 613
 614                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 615
 616                         goto end;
 617                         /* break; */
 618
 619                 default:
 620                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 621                         ret= -1;
 622                         goto end;
 623                         /* break; */
 624                         }
 625
 626                 /* did we do anything */
 627                 if (!s->s3->tmp.reuse_message && !skip)
 628                         {
 629                         if (s->debug)
 630                                 {
 631                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 632                                         goto end;
 633                                 }
 634
 635                         if ((cb != NULL) && (s->state != state))
 636                                 {
 637                                 new_state=s->state;
 638                                 s->state=state;
 639                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 640                                 s->state=new_state;
 641                                 }
 642                         }
 643                 skip=0;
 644                 }
 645 end:
 646         s->in_handshake--;
 647         if (buf != NULL)
 648                 BUF_MEM_free(buf);
 649         if (cb != NULL)
 650                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 651         return(ret);
 652         }
 653
 654
 655 int ssl3_client_hello(SSL *s)
 656         {
 657         unsigned char *buf;
 658         unsigned char *p,*d;
 659         int i;
 660         unsigned long l;
 661 #ifndef OPENSSL_NO_COMP
 662         int j;
 663         SSL_COMP *comp;
 664 #endif
 665
 666         buf=(unsigned char *)s->init_buf->data;
 667         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 668                 {
 669                 SSL_SESSION *sess = s->session;
 670                 if ((sess == NULL) ||
 671                         (sess->ssl_version != s->version) ||
 672 #ifdef OPENSSL_NO_TLSEXT
 673                         !sess->session_id_length ||
 674 #else
 675                         (!sess->session_id_length && !sess->tlsext_tick) ||
 676 #endif
 677                         (sess->not_resumable))
 678                         {
 679                         if (!ssl_get_new_session(s,0))
 680                                 goto err;
 681                         }
 682                 /* else use the pre-loaded session */
 683
 684                 p=s->s3->client_random;
 685
 686                 if (ssl_fill_hello_random(s, 0, p, SSL3_RANDOM_SIZE) <= 0)
 687                         goto err;
 688
 689                 /* Do the message type and length last */
 690                 d=p= &(buf[4]);
 691
 692                 /* version indicates the negotiated version: for example from
 693                  * an SSLv2/v3 compatible client hello). The client_version
 694                  * field is the maximum version we permit and it is also
 695                  * used in RSA encrypted premaster secrets. Some servers can
 696                  * choke if we initially report a higher version then
 697                  * renegotiate to a lower one in the premaster secret. This
 698                  * didn't happen with TLS 1.0 as most servers supported it
 699                  * but it can with TLS 1.1 or later if the server only supports
 700                  * 1.0.
 701                  *
 702                  * Possible scenario with previous logic:
 703                  *      1. Client hello indicates TLS 1.2
 704                  *      2. Server hello says TLS 1.0
 705                  *      3. RSA encrypted premaster secret uses 1.2.
 706                  *      4. Handhaked proceeds using TLS 1.0.
 707                  *      5. Server sends hello request to renegotiate.
 708                  *      6. Client hello indicates TLS v1.0 as we now
 709                  *         know that is maximum server supports.
 710                  *      7. Server chokes on RSA encrypted premaster secret
 711                  *         containing version 1.0.
 712                  *
 713                  * For interoperability it should be OK to always use the
 714                  * maximum version we support in client hello and then rely
 715                  * on the checking of version to ensure the servers isn't
 716                  * being inconsistent: for example initially negotiating with
 717                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
 718                  * client_version in client hello and not resetting it to
 719                  * the negotiated version.
 720                  */
 721 #if 0
 722                 *(p++)=s->version>>8;
 723                 *(p++)=s->version&0xff;
 724                 s->client_version=s->version;
 725 #else
 726                 *(p++)=s->client_version>>8;
 727                 *(p++)=s->client_version&0xff;
 728 #endif
 729
 730                 /* Random stuff */
 731                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 732                 p+=SSL3_RANDOM_SIZE;
 733
 734                 /* Session ID */
 735                 if (s->new_session)
 736                         i=0;
 737                 else
 738                         i=s->session->session_id_length;
 739                 *(p++)=i;
 740                 if (i != 0)
 741                         {
 742                         if (i > (int)sizeof(s->session->session_id))
 743                                 {
 744                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 745                                 goto err;
 746                                 }
 747                         memcpy(p,s->session->session_id,i);
 748                         p+=i;
 749                         }
 750
 751                 /* Ciphers supported */
 752                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 753                 if (i == 0)
 754                         {
 755                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 756                         goto err;
 757                         }
 758 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
 759                         /* Some servers hang if client hello > 256 bytes
 760                          * as hack workaround chop number of supported ciphers
 761                          * to keep it well below this if we use TLS v1.2
 762                          */
 763                         if (TLS1_get_version(s) >= TLS1_2_VERSION
 764                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
 765                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
 766 #endif
 767                 s2n(i,p);
 768                 p+=i;
 769
 770                 /* COMPRESSION */
 771 #ifdef OPENSSL_NO_COMP
 772                 *(p++)=1;
 773 #else
 774
 775                 if ((s->options & SSL_OP_NO_COMPRESSION)
 776                                         || !s->ctx->comp_methods)
 777                         j=0;
 778                 else
 779                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 780                 *(p++)=1+j;
 781                 for (i=0; i<j; i++)
 782                         {
 783                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 784                         *(p++)=comp->id;
 785                         }
 786 #endif
 787                 *(p++)=0; /* Add the NULL method */
 788
 789 #ifndef OPENSSL_NO_TLSEXT
 790                 /* TLS extensions*/
 791                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 792                         {
 793                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 794                         goto err;
 795                         }
 796                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 797                         {
 798                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 799                         goto err;
 800                         }
 801 #endif
 802
 803                 l=(p-d);
 804                 d=buf;
 805                 *(d++)=SSL3_MT_CLIENT_HELLO;
 806                 l2n3(l,d);
 807
 808                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 809                 /* number of bytes to write */
 810                 s->init_num=p-buf;
 811                 s->init_off=0;
 812                 }
 813
 814         /* SSL3_ST_CW_CLNT_HELLO_B */
 815         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 816 err:
 817         return(-1);
 818         }
 819
 820 int ssl3_get_server_hello(SSL *s)
 821         {
 822         STACK_OF(SSL_CIPHER) *sk;
 823         const SSL_CIPHER *c;
 824         unsigned char *p,*d;
 825         int i,al,ok;
 826         unsigned int j;
 827         long n;
 828 #ifndef OPENSSL_NO_COMP
 829         SSL_COMP *comp;
 830 #endif
 831
 832         n=s->method->ssl_get_message(s,
 833                 SSL3_ST_CR_SRVR_HELLO_A,
 834                 SSL3_ST_CR_SRVR_HELLO_B,
 835                 -1,
 836                 20000, /* ?? */
 837                 &ok);
 838
 839         if (!ok) return((int)n);
 840
 841         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 842                 {
 843                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 844                         {
 845                         if ( s->d1->send_cookie == 0)
 846                                 {
 847                                 s->s3->tmp.reuse_message = 1;
 848                                 return 1;
 849                                 }
 850                         else /* already sent a cookie */
 851                                 {
 852                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 853                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 854                                 goto f_err;
 855                                 }
 856                         }
 857                 }
 858
 859         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 860                 {
 861                 al=SSL_AD_UNEXPECTED_MESSAGE;
 862                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 863                 goto f_err;
 864                 }
 865
 866         d=p=(unsigned char *)s->init_msg;
 867
 868         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 869                 {
 870                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 871                 s->version=(s->version&0xff00)|p[1];
 872                 al=SSL_AD_PROTOCOL_VERSION;
 873                 goto f_err;
 874                 }
 875         p+=2;
 876
 877         /* load the server hello data */
 878         /* load the server random */
 879         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 880         p+=SSL3_RANDOM_SIZE;
 881
 882         /* get the session-id */
 883         j= *(p++);
 884
 885         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 886                 {
 887                 al=SSL_AD_ILLEGAL_PARAMETER;
 888                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 889                 goto f_err;
 890                 }
 891
 892 #ifndef OPENSSL_NO_TLSEXT
 893         /* check if we want to resume the session based on external pre-shared secret */
 894         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 895                 {
 896                 SSL_CIPHER *pref_cipher=NULL;
 897                 s->session->master_key_length=sizeof(s->session->master_key);
 898                 if (s->tls_session_secret_cb(s, s->session->master_key,
 899                                              &s->session->master_key_length,
 900                                              NULL, &pref_cipher,
 901                                              s->tls_session_secret_cb_arg))
 902                         {
 903                         s->session->cipher = pref_cipher ?
 904                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
 905                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 906                         }
 907                 }
 908 #endif /* OPENSSL_NO_TLSEXT */
 909
 910         if (j != 0 && j == s->session->session_id_length
 911             && memcmp(p,s->session->session_id,j) == 0)
 912             {
 913             if(s->sid_ctx_length != s->session->sid_ctx_length
 914                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 915                 {
 916                 /* actually a client application bug */
 917                 al=SSL_AD_ILLEGAL_PARAMETER;
 918                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 919                 goto f_err;
 920                 }
 921             s->s3->flags |= SSL3_FLAGS_CCS_OK;
 922             s->hit=1;
 923             }
 924         else    /* a miss or crap from the other end */
 925                 {
 926                 /* If we were trying for session-id reuse, make a new
 927                  * SSL_SESSION so we don't stuff up other people */
 928                 s->hit=0;
 929                 if (s->session->session_id_length > 0)
 930                         {
 931                         if (!ssl_get_new_session(s,0))
 932                                 {
 933                                 al=SSL_AD_INTERNAL_ERROR;
 934                                 goto f_err;
 935                                 }
 936                         }
 937                 s->session->session_id_length=j;
 938                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 939                 }
 940         p+=j;
 941         c=ssl_get_cipher_by_char(s,p);
 942         if (c == NULL)
 943                 {
 944                 /* unknown cipher */
 945                 al=SSL_AD_ILLEGAL_PARAMETER;
 946                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 947                 goto f_err;
 948                 }
 949         /* TLS v1.2 only ciphersuites require v1.2 or later */
 950         if ((c->algorithm_ssl & SSL_TLSV1_2) &&
 951                 (TLS1_get_version(s) < TLS1_2_VERSION))
 952                 {
 953                 al=SSL_AD_ILLEGAL_PARAMETER;
 954                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 955                 goto f_err;
 956                 }
 957 #ifndef OPENSSL_NO_SRP
 958         if (((c->algorithm_mkey & SSL_kSRP) || (c->algorithm_auth & SSL_aSRP)) &&
 959                     !(s->srp_ctx.srp_Mask & SSL_kSRP))
 960                 {
 961                 al=SSL_AD_ILLEGAL_PARAMETER;
 962                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 963                 goto f_err;
 964                 }
 965 #endif /* OPENSSL_NO_SRP */
 966         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 967
 968         sk=ssl_get_ciphers_by_id(s);
 969         i=sk_SSL_CIPHER_find(sk,c);
 970         if (i < 0)
 971                 {
 972                 /* we did not say we would use this cipher */
 973                 al=SSL_AD_ILLEGAL_PARAMETER;
 974                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 975                 goto f_err;
 976                 }
 977
 978         /* Depending on the session caching (internal/external), the cipher
 979            and/or cipher_id values may not be set. Make sure that
 980            cipher_id is set and use it for comparison. */
 981         if (s->session->cipher)
 982                 s->session->cipher_id = s->session->cipher->id;
 983         if (s->hit && (s->session->cipher_id != c->id))
 984                 {
 985 /* Workaround is now obsolete */
 986 #if 0
 987                 if (!(s->options &
 988                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 989 #endif
 990                         {
 991                         al=SSL_AD_ILLEGAL_PARAMETER;
 992                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 993                         goto f_err;
 994                         }
 995                 }
 996         s->s3->tmp.new_cipher=c;
 997         /* Don't digest cached records if TLS v1.2: we may need them for
 998          * client authentication.
 999          */
1000         if (TLS1_get_version(s) < TLS1_2_VERSION && !ssl3_digest_cached_records(s))
1001                 {
1002                 al = SSL_AD_INTERNAL_ERROR;
1003                 goto f_err;
1004                 }
1005         /* lets get the compression algorithm */
1006         /* COMPRESSION */
1007 #ifdef OPENSSL_NO_COMP
1008         if (*(p++) != 0)
1009                 {
1010                 al=SSL_AD_ILLEGAL_PARAMETER;
1011                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1012                 goto f_err;
1013                 }
1014         /* If compression is disabled we'd better not try to resume a session
1015          * using compression.
1016          */
1017         if (s->session->compress_meth != 0)
1018                 {
1019                 al=SSL_AD_INTERNAL_ERROR;
1020                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1021                 goto f_err;
1022                 }
1023 #else
1024         j= *(p++);
1025         if (s->hit && j != s->session->compress_meth)
1026                 {
1027                 al=SSL_AD_ILLEGAL_PARAMETER;
1028                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1029                 goto f_err;
1030                 }
1031         if (j == 0)
1032                 comp=NULL;
1033         else if (s->options & SSL_OP_NO_COMPRESSION)
1034                 {
1035                 al=SSL_AD_ILLEGAL_PARAMETER;
1036                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1037                 goto f_err;
1038                 }
1039         else
1040                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1041
1042         if ((j != 0) && (comp == NULL))
1043                 {
1044                 al=SSL_AD_ILLEGAL_PARAMETER;
1045                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1046                 goto f_err;
1047                 }
1048         else
1049                 {
1050                 s->s3->tmp.new_compression=comp;
1051                 }
1052 #endif
1053
1054 #ifndef OPENSSL_NO_TLSEXT
1055         /* TLS extensions*/
1056         if (s->version >= SSL3_VERSION)
1057                 {
1058                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
1059                         {
1060                         /* 'al' set by ssl_parse_serverhello_tlsext */
1061                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1062                         goto f_err;
1063                         }
1064                 if (ssl_check_serverhello_tlsext(s) <= 0)
1065                         {
1066                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
1067                                 goto err;
1068                         }
1069                 }
1070 #endif
1071
1072         if (p != (d+n))
1073                 {
1074                 /* wrong packet length */
1075                 al=SSL_AD_DECODE_ERROR;
1076                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1077                 goto f_err;
1078                 }
1079
1080         return(1);
1081 f_err:
1082         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1083 err:
1084         return(-1);
1085         }
1086
1087 int ssl3_get_server_certificate(SSL *s)
1088         {
1089         int al,i,ok,ret= -1;
1090         unsigned long n,nc,llen,l;
1091         X509 *x=NULL;
1092         const unsigned char *q,*p;
1093         unsigned char *d;
1094         STACK_OF(X509) *sk=NULL;
1095         SESS_CERT *sc;
1096         EVP_PKEY *pkey=NULL;
1097         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1098
1099         n=s->method->ssl_get_message(s,
1100                 SSL3_ST_CR_CERT_A,
1101                 SSL3_ST_CR_CERT_B,
1102                 -1,
1103                 s->max_cert_list,
1104                 &ok);
1105
1106         if (!ok) return((int)n);
1107
1108         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1109                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1110                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1111                 {
1112                 s->s3->tmp.reuse_message=1;
1113                 return(1);
1114                 }
1115
1116         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1117                 {
1118                 al=SSL_AD_UNEXPECTED_MESSAGE;
1119                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1120                 goto f_err;
1121                 }
1122         p=d=(unsigned char *)s->init_msg;
1123
1124         if ((sk=sk_X509_new_null()) == NULL)
1125                 {
1126                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1127                 goto err;
1128                 }
1129
1130         n2l3(p,llen);
1131         if (llen+3 != n)
1132                 {
1133                 al=SSL_AD_DECODE_ERROR;
1134                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1135                 goto f_err;
1136                 }
1137         for (nc=0; nc<llen; )
1138                 {
1139                 n2l3(p,l);
1140                 if ((l+nc+3) > llen)
1141                         {
1142                         al=SSL_AD_DECODE_ERROR;
1143                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1144                         goto f_err;
1145                         }
1146
1147                 q=p;
1148                 x=d2i_X509(NULL,&q,l);
1149                 if (x == NULL)
1150                         {
1151                         al=SSL_AD_BAD_CERTIFICATE;
1152                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1153                         goto f_err;
1154                         }
1155                 if (q != (p+l))
1156                         {
1157                         al=SSL_AD_DECODE_ERROR;
1158                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1159                         goto f_err;
1160                         }
1161                 if (!sk_X509_push(sk,x))
1162                         {
1163                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1164                         goto err;
1165                         }
1166                 x=NULL;
1167                 nc+=l+3;
1168                 p=q;
1169                 }
1170
1171         i=ssl_verify_cert_chain(s,sk);
1172         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1173 #ifndef OPENSSL_NO_KRB5
1174             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1175                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1176 #endif /* OPENSSL_NO_KRB5 */
1177                 )
1178                 {
1179                 al=ssl_verify_alarm_type(s->verify_result);
1180                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1181                 goto f_err;
1182                 }
1183         ERR_clear_error(); /* but we keep s->verify_result */
1184
1185         sc=ssl_sess_cert_new();
1186         if (sc == NULL) goto err;
1187
1188         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1189         s->session->sess_cert=sc;
1190
1191         sc->cert_chain=sk;
1192         /* Inconsistency alert: cert_chain does include the peer's
1193          * certificate, which we don't include in s3_srvr.c */
1194         x=sk_X509_value(sk,0);
1195         sk=NULL;
1196         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1197
1198         pkey=X509_get_pubkey(x);
1199
1200         /* VRS: allow null cert if auth == KRB5 */
1201         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1202                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1203                     ? 0 : 1;
1204
1205 #ifdef KSSL_DEBUG
1206         printf("pkey,x = %p, %p\n", pkey,x);
1207         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1208         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1209                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1210 #endif    /* KSSL_DEBUG */
1211
1212         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1213                 {
1214                 x=NULL;
1215                 al=SSL3_AL_FATAL;
1216                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1217                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1218                 goto f_err;
1219                 }
1220
1221         i=ssl_cert_type(x,pkey);
1222         if (need_cert && i < 0)
1223                 {
1224                 x=NULL;
1225                 al=SSL3_AL_FATAL;
1226                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1227                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1228                 goto f_err;
1229                 }
1230
1231         if (need_cert)
1232                 {
1233                 sc->peer_cert_type=i;
1234                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1235                 /* Why would the following ever happen?
1236                  * We just created sc a couple of lines ago. */
1237                 if (sc->peer_pkeys[i].x509 != NULL)
1238                         X509_free(sc->peer_pkeys[i].x509);
1239                 sc->peer_pkeys[i].x509=x;
1240                 sc->peer_key= &(sc->peer_pkeys[i]);
1241
1242                 if (s->session->peer != NULL)
1243                         X509_free(s->session->peer);
1244                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1245                 s->session->peer=x;
1246                 }
1247         else
1248                 {
1249                 sc->peer_cert_type=i;
1250                 sc->peer_key= NULL;
1251
1252                 if (s->session->peer != NULL)
1253                         X509_free(s->session->peer);
1254                 s->session->peer=NULL;
1255                 }
1256         s->session->verify_result = s->verify_result;
1257
1258         x=NULL;
1259         ret=1;
1260
1261         if (0)
1262                 {
1263 f_err:
1264                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1265                 }
1266 err:
1267         EVP_PKEY_free(pkey);
1268         X509_free(x);
1269         sk_X509_pop_free(sk,X509_free);
1270         return(ret);
1271         }
1272
1273 int ssl3_get_key_exchange(SSL *s)
1274         {
1275 #ifndef OPENSSL_NO_RSA
1276         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1277 #endif
1278         EVP_MD_CTX md_ctx;
1279         unsigned char *param,*p;
1280         int al,j,ok;
1281         long i,param_len,n,alg_k,alg_a;
1282         EVP_PKEY *pkey=NULL;
1283         const EVP_MD *md = NULL;
1284 #ifndef OPENSSL_NO_RSA
1285         RSA *rsa=NULL;
1286 #endif
1287 #ifndef OPENSSL_NO_DH
1288         DH *dh=NULL;
1289 #endif
1290 #ifndef OPENSSL_NO_ECDH
1291         EC_KEY *ecdh = NULL;
1292         BN_CTX *bn_ctx = NULL;
1293         EC_POINT *srvr_ecpoint = NULL;
1294         int curve_nid = 0;
1295         int encoded_pt_len = 0;
1296 #endif
1297
1298         EVP_MD_CTX_init(&md_ctx);
1299
1300         /* use same message size as in ssl3_get_certificate_request()
1301          * as ServerKeyExchange message may be skipped */
1302         n=s->method->ssl_get_message(s,
1303                 SSL3_ST_CR_KEY_EXCH_A,
1304                 SSL3_ST_CR_KEY_EXCH_B,
1305                 -1,
1306                 s->max_cert_list,
1307                 &ok);
1308         if (!ok) return((int)n);
1309
1310         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1311
1312         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1313                 {
1314                 /*
1315                  * Can't skip server key exchange if this is an ephemeral
1316                  * ciphersuite.
1317                  */
1318                 if (alg_k & (SSL_kEDH|SSL_kEECDH))
1319                         {
1320                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1321                         al = SSL_AD_UNEXPECTED_MESSAGE;
1322                         goto f_err;
1323                         }
1324 #ifndef OPENSSL_NO_PSK
1325                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1326                    omitted if no identity hint is sent. Set
1327                    session->sess_cert anyway to avoid problems
1328                    later.*/
1329                 if (alg_k & SSL_kPSK)
1330                         {
1331                         s->session->sess_cert=ssl_sess_cert_new();
1332                         if (s->ctx->psk_identity_hint)
1333                                 OPENSSL_free(s->ctx->psk_identity_hint);
1334                         s->ctx->psk_identity_hint = NULL;
1335                         }
1336 #endif
1337                 s->s3->tmp.reuse_message=1;
1338                 return(1);
1339                 }
1340
1341         param=p=(unsigned char *)s->init_msg;
1342         if (s->session->sess_cert != NULL)
1343                 {
1344 #ifndef OPENSSL_NO_RSA
1345                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1346                         {
1347                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1348                         s->session->sess_cert->peer_rsa_tmp=NULL;
1349                         }
1350 #endif
1351 #ifndef OPENSSL_NO_DH
1352                 if (s->session->sess_cert->peer_dh_tmp)
1353                         {
1354                         DH_free(s->session->sess_cert->peer_dh_tmp);
1355                         s->session->sess_cert->peer_dh_tmp=NULL;
1356                         }
1357 #endif
1358 #ifndef OPENSSL_NO_ECDH
1359                 if (s->session->sess_cert->peer_ecdh_tmp)
1360                         {
1361                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1362                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1363                         }
1364 #endif
1365                 }
1366         else
1367                 {
1368                 s->session->sess_cert=ssl_sess_cert_new();
1369                 }
1370
1371         /* Total length of the parameters including the length prefix */
1372         param_len=0;
1373
1374         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1375
1376         al=SSL_AD_DECODE_ERROR;
1377
1378 #ifndef OPENSSL_NO_PSK
1379         if (alg_k & SSL_kPSK)
1380                 {
1381                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1382
1383                 param_len = 2;
1384                 if (param_len > n)
1385                         {
1386                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1387                                 SSL_R_LENGTH_TOO_SHORT);
1388                         goto f_err;
1389                         }
1390                 n2s(p,i);
1391
1392                 /* Store PSK identity hint for later use, hint is used
1393                  * in ssl3_send_client_key_exchange.  Assume that the
1394                  * maximum length of a PSK identity hint can be as
1395                  * long as the maximum length of a PSK identity. */
1396                 if (i > PSK_MAX_IDENTITY_LEN)
1397                         {
1398                         al=SSL_AD_HANDSHAKE_FAILURE;
1399                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1400                                 SSL_R_DATA_LENGTH_TOO_LONG);
1401                         goto f_err;
1402                         }
1403                 if (i > n - param_len)
1404                         {
1405                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1406                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1407                         goto f_err;
1408                         }
1409                 param_len += i;
1410
1411                 /* If received PSK identity hint contains NULL
1412                  * characters, the hint is truncated from the first
1413                  * NULL. p may not be ending with NULL, so create a
1414                  * NULL-terminated string. */
1415                 memcpy(tmp_id_hint, p, i);
1416                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1417                 if (s->ctx->psk_identity_hint != NULL)
1418                         OPENSSL_free(s->ctx->psk_identity_hint);
1419                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1420                 if (s->ctx->psk_identity_hint == NULL)
1421                         {
1422                         al=SSL_AD_HANDSHAKE_FAILURE;
1423                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1424                         goto f_err;
1425                         }
1426
1427                 p+=i;
1428                 n-=param_len;
1429                 }
1430         else
1431 #endif /* !OPENSSL_NO_PSK */
1432 #ifndef OPENSSL_NO_SRP
1433         if (alg_k & SSL_kSRP)
1434                 {
1435                 param_len = 2;
1436                 if (param_len > n)
1437                         {
1438                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1439                                 SSL_R_LENGTH_TOO_SHORT);
1440                         goto f_err;
1441                         }
1442                 n2s(p,i);
1443
1444                 if (i > n - param_len)
1445                         {
1446                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1447                         goto f_err;
1448                         }
1449                 param_len += i;
1450
1451                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1452                         {
1453                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1454                         goto err;
1455                         }
1456                 p+=i;
1457
1458
1459                 if (2 > n - param_len)
1460                         {
1461                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1462                                 SSL_R_LENGTH_TOO_SHORT);
1463                         goto f_err;
1464                         }
1465                 param_len += 2;
1466
1467                 n2s(p,i);
1468
1469                 if (i > n - param_len)
1470                         {
1471                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1472                         goto f_err;
1473                         }
1474                 param_len += i;
1475
1476                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1477                         {
1478                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1479                         goto err;
1480                         }
1481                 p+=i;
1482
1483
1484                 if (1 > n - param_len)
1485                         {
1486                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1487                                 SSL_R_LENGTH_TOO_SHORT);
1488                         goto f_err;
1489                         }
1490                 param_len += 1;
1491
1492                 i = (unsigned int)(p[0]);
1493                 p++;
1494
1495                 if (i > n - param_len)
1496                         {
1497                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1498                         goto f_err;
1499                         }
1500                 param_len += i;
1501
1502                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1503                         {
1504                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1505                         goto err;
1506                         }
1507                 p+=i;
1508
1509                 if (2 > n - param_len)
1510                         {
1511                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1512                                 SSL_R_LENGTH_TOO_SHORT);
1513                         goto f_err;
1514                         }
1515                 param_len += 2;
1516
1517                 n2s(p,i);
1518
1519                 if (i > n - param_len)
1520                         {
1521                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1522                         goto f_err;
1523                         }
1524                 param_len += i;
1525
1526                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1527                         {
1528                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1529                         goto err;
1530                         }
1531                 p+=i;
1532                 n-=param_len;
1533
1534                 if (!srp_verify_server_param(s, &al))
1535                         {
1536                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
1537                         goto f_err;
1538                         }
1539
1540 /* We must check if there is a certificate */
1541 #ifndef OPENSSL_NO_RSA
1542                 if (alg_a & SSL_aRSA)
1543                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1544 #else
1545                 if (0)
1546                         ;
1547 #endif
1548 #ifndef OPENSSL_NO_DSA
1549                 else if (alg_a & SSL_aDSS)
1550                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1551 #endif
1552                 }
1553         else
1554 #endif /* !OPENSSL_NO_SRP */
1555 #ifndef OPENSSL_NO_RSA
1556         if (alg_k & SSL_kRSA)
1557                 {
1558                 /* Temporary RSA keys only allowed in export ciphersuites */
1559                 if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher))
1560                         {
1561                         al=SSL_AD_UNEXPECTED_MESSAGE;
1562                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1563                         goto f_err;
1564                         }
1565                 if ((rsa=RSA_new()) == NULL)
1566                         {
1567                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1568                         goto err;
1569                         }
1570
1571                 param_len = 2;
1572                 if (param_len > n)
1573                         {
1574                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1575                                 SSL_R_LENGTH_TOO_SHORT);
1576                         goto f_err;
1577                         }
1578                 n2s(p,i);
1579
1580                 if (i > n - param_len)
1581                         {
1582                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1583                         goto f_err;
1584                         }
1585                 param_len += i;
1586
1587                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1588                         {
1589                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1590                         goto err;
1591                         }
1592                 p+=i;
1593
1594                 if (2 > n - param_len)
1595                         {
1596                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1597                                 SSL_R_LENGTH_TOO_SHORT);
1598                         goto f_err;
1599                         }
1600                 param_len += 2;
1601
1602                 n2s(p,i);
1603
1604                 if (i > n - param_len)
1605                         {
1606                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1607                         goto f_err;
1608                         }
1609                 param_len += i;
1610
1611                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1612                         {
1613                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1614                         goto err;
1615                         }
1616                 p+=i;
1617                 n-=param_len;
1618
1619                 /* this should be because we are using an export cipher */
1620                 if (alg_a & SSL_aRSA)
1621                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1622                 else
1623                         {
1624                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1625                         goto err;
1626                         }
1627                 s->session->sess_cert->peer_rsa_tmp=rsa;
1628                 rsa=NULL;
1629                 }
1630 #else /* OPENSSL_NO_RSA */
1631         if (0)
1632                 ;
1633 #endif
1634 #ifndef OPENSSL_NO_DH
1635         else if (alg_k & SSL_kEDH)
1636                 {
1637                 if ((dh=DH_new()) == NULL)
1638                         {
1639                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1640                         goto err;
1641                         }
1642
1643                 param_len = 2;
1644                 if (param_len > n)
1645                         {
1646                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1647                                 SSL_R_LENGTH_TOO_SHORT);
1648                         goto f_err;
1649                         }
1650                 n2s(p,i);
1651
1652                 if (i > n - param_len)
1653                         {
1654                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1655                         goto f_err;
1656                         }
1657                 param_len += i;
1658
1659                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1660                         {
1661                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1662                         goto err;
1663                         }
1664                 p+=i;
1665
1666                 if (2 > n - param_len)
1667                         {
1668                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1669                                 SSL_R_LENGTH_TOO_SHORT);
1670                         goto f_err;
1671                         }
1672                 param_len += 2;
1673
1674                 n2s(p,i);
1675
1676                 if (i > n - param_len)
1677                         {
1678                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1679                         goto f_err;
1680                         }
1681                 param_len += i;
1682
1683                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1684                         {
1685                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1686                         goto err;
1687                         }
1688                 p+=i;
1689
1690                 if (2 > n - param_len)
1691                         {
1692                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1693                                 SSL_R_LENGTH_TOO_SHORT);
1694                         goto f_err;
1695                         }
1696                 param_len += 2;
1697
1698                 n2s(p,i);
1699
1700                 if (i > n - param_len)
1701                         {
1702                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1703                         goto f_err;
1704                         }
1705                 param_len += i;
1706
1707                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1708                         {
1709                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1710                         goto err;
1711                         }
1712                 p+=i;
1713                 n-=param_len;
1714
1715 #ifndef OPENSSL_NO_RSA
1716                 if (alg_a & SSL_aRSA)
1717                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1718 #else
1719                 if (0)
1720                         ;
1721 #endif
1722 #ifndef OPENSSL_NO_DSA
1723                 else if (alg_a & SSL_aDSS)
1724                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1725 #endif
1726                 /* else anonymous DH, so no certificate or pkey. */
1727
1728                 s->session->sess_cert->peer_dh_tmp=dh;
1729                 dh=NULL;
1730                 }
1731         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1732                 {
1733                 al=SSL_AD_ILLEGAL_PARAMETER;
1734                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1735                 goto f_err;
1736                 }
1737 #endif /* !OPENSSL_NO_DH */
1738
1739 #ifndef OPENSSL_NO_ECDH
1740         else if (alg_k & SSL_kEECDH)
1741                 {
1742                 EC_GROUP *ngroup;
1743                 const EC_GROUP *group;
1744
1745                 if ((ecdh=EC_KEY_new()) == NULL)
1746                         {
1747                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1748                         goto err;
1749                         }
1750
1751                 /* Extract elliptic curve parameters and the
1752                  * server's ephemeral ECDH public key.
1753                  * Keep accumulating lengths of various components in
1754                  * param_len and make sure it never exceeds n.
1755                  */
1756
1757                 /* XXX: For now we only support named (not generic) curves
1758                  * and the ECParameters in this case is just three bytes. We
1759                  * also need one byte for the length of the encoded point
1760                  */
1761                 param_len=4;
1762                 if (param_len > n)
1763                         {
1764                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1765                                 SSL_R_LENGTH_TOO_SHORT);
1766                         goto f_err;
1767                         }
1768
1769                 if ((*p != NAMED_CURVE_TYPE) ||
1770                     ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0))
1771                         {
1772                         al=SSL_AD_INTERNAL_ERROR;
1773                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1774                         goto f_err;
1775                         }
1776
1777                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1778                 if (ngroup == NULL)
1779                         {
1780                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1781                         goto err;
1782                         }
1783                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1784                         {
1785                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1786                         goto err;
1787                         }
1788                 EC_GROUP_free(ngroup);
1789
1790                 group = EC_KEY_get0_group(ecdh);
1791
1792                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1793                     (EC_GROUP_get_degree(group) > 163))
1794                         {
1795                         al=SSL_AD_EXPORT_RESTRICTION;
1796                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1797                         goto f_err;
1798                         }
1799
1800                 p+=3;
1801
1802                 /* Next, get the encoded ECPoint */
1803                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1804                     ((bn_ctx = BN_CTX_new()) == NULL))
1805                         {
1806                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1807                         goto err;
1808                         }
1809
1810                 encoded_pt_len = *p;  /* length of encoded point */
1811                 p+=1;
1812
1813                 if ((encoded_pt_len > n - param_len) ||
1814                     (EC_POINT_oct2point(group, srvr_ecpoint,
1815                         p, encoded_pt_len, bn_ctx) == 0))
1816                         {
1817                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1818                         goto f_err;
1819                         }
1820                 param_len += encoded_pt_len;
1821
1822                 n-=param_len;
1823                 p+=encoded_pt_len;
1824
1825                 /* The ECC/TLS specification does not mention
1826                  * the use of DSA to sign ECParameters in the server
1827                  * key exchange message. We do support RSA and ECDSA.
1828                  */
1829                 if (0) ;
1830 #ifndef OPENSSL_NO_RSA
1831                 else if (alg_a & SSL_aRSA)
1832                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1833 #endif
1834 #ifndef OPENSSL_NO_ECDSA
1835                 else if (alg_a & SSL_aECDSA)
1836                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1837 #endif
1838                 /* else anonymous ECDH, so no certificate or pkey. */
1839                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1840                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1841                 ecdh=NULL;
1842                 BN_CTX_free(bn_ctx);
1843                 bn_ctx = NULL;
1844                 EC_POINT_free(srvr_ecpoint);
1845                 srvr_ecpoint = NULL;
1846                 }
1847         else if (alg_k)
1848                 {
1849                 al=SSL_AD_UNEXPECTED_MESSAGE;
1850                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1851                 goto f_err;
1852                 }
1853 #endif /* !OPENSSL_NO_ECDH */
1854
1855
1856         /* p points to the next byte, there are 'n' bytes left */
1857
1858         /* if it was signed, check the signature */
1859         if (pkey != NULL)
1860                 {
1861                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
1862                         {
1863                         int sigalg;
1864                         if (2 > n)
1865                                 {
1866                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1867                                         SSL_R_LENGTH_TOO_SHORT);
1868                                 goto f_err;
1869                                 }
1870
1871                         sigalg = tls12_get_sigid(pkey);
1872                         /* Should never happen */
1873                         if (sigalg == -1)
1874                                 {
1875                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1876                                 goto err;
1877                                 }
1878                         /* Check key type is consistent with signature */
1879                         if (sigalg != (int)p[1])
1880                                 {
1881                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_TYPE);
1882                                 al=SSL_AD_DECODE_ERROR;
1883                                 goto f_err;
1884                                 }
1885                         md = tls12_get_hash(p[0]);
1886                         if (md == NULL)
1887                                 {
1888                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNKNOWN_DIGEST);
1889                                 goto f_err;
1890                                 }
1891 #ifdef SSL_DEBUG
1892 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1893 #endif
1894                         p += 2;
1895                         n -= 2;
1896                         }
1897                 else
1898                         md = EVP_sha1();
1899
1900                 if (2 > n)
1901                         {
1902                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1903                                 SSL_R_LENGTH_TOO_SHORT);
1904                         goto f_err;
1905                         }
1906                 n2s(p,i);
1907                 n-=2;
1908                 j=EVP_PKEY_size(pkey);
1909
1910                 /* Check signature length. If n is 0 then signature is empty */
1911                 if ((i != n) || (n > j) || (n <= 0))
1912                         {
1913                         /* wrong packet length */
1914                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1915                         goto f_err;
1916                         }
1917
1918 #ifndef OPENSSL_NO_RSA
1919                 if (pkey->type == EVP_PKEY_RSA && TLS1_get_version(s) < TLS1_2_VERSION)
1920                         {
1921                         int num;
1922                         unsigned int size;
1923
1924                         j=0;
1925                         q=md_buf;
1926                         for (num=2; num > 0; num--)
1927                                 {
1928                                 EVP_MD_CTX_set_flags(&md_ctx,
1929                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1930                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1931                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1932                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1933                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1934                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1935                                 EVP_DigestFinal_ex(&md_ctx,q,&size);
1936                                 q+=size;
1937                                 j+=size;
1938                                 }
1939                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1940                                                                 pkey->pkey.rsa);
1941                         if (i < 0)
1942                                 {
1943                                 al=SSL_AD_DECRYPT_ERROR;
1944                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1945                                 goto f_err;
1946                                 }
1947                         if (i == 0)
1948                                 {
1949                                 /* bad signature */
1950                                 al=SSL_AD_DECRYPT_ERROR;
1951                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1952                                 goto f_err;
1953                                 }
1954                         }
1955                 else
1956 #endif
1957                         {
1958                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1959                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1960                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1961                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1962                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1963                                 {
1964                                 /* bad signature */
1965                                 al=SSL_AD_DECRYPT_ERROR;
1966                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1967                                 goto f_err;
1968                                 }
1969                         }
1970                 }
1971         else
1972                 {
1973                 /* aNULL, aSRP or kPSK do not need public keys */
1974                 if (!(alg_a & (SSL_aNULL|SSL_aSRP)) && !(alg_k & SSL_kPSK))
1975                         {
1976                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1977                         goto err;
1978                         }
1979                 /* still data left over */
1980                 if (n != 0)
1981                         {
1982                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1983                         goto f_err;
1984                         }
1985                 }
1986         EVP_PKEY_free(pkey);
1987         EVP_MD_CTX_cleanup(&md_ctx);
1988         return(1);
1989 f_err:
1990         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1991 err:
1992         EVP_PKEY_free(pkey);
1993 #ifndef OPENSSL_NO_RSA
1994         if (rsa != NULL)
1995                 RSA_free(rsa);
1996 #endif
1997 #ifndef OPENSSL_NO_DH
1998         if (dh != NULL)
1999                 DH_free(dh);
2000 #endif
2001 #ifndef OPENSSL_NO_ECDH
2002         BN_CTX_free(bn_ctx);
2003         EC_POINT_free(srvr_ecpoint);
2004         if (ecdh != NULL)
2005                 EC_KEY_free(ecdh);
2006 #endif
2007         EVP_MD_CTX_cleanup(&md_ctx);
2008         return(-1);
2009         }
2010
2011 int ssl3_get_certificate_request(SSL *s)
2012         {
2013         int ok,ret=0;
2014         unsigned long n,nc,l;
2015         unsigned int llen, ctype_num,i;
2016         X509_NAME *xn=NULL;
2017         const unsigned char *p,*q;
2018         unsigned char *d;
2019         STACK_OF(X509_NAME) *ca_sk=NULL;
2020
2021         n=s->method->ssl_get_message(s,
2022                 SSL3_ST_CR_CERT_REQ_A,
2023                 SSL3_ST_CR_CERT_REQ_B,
2024                 -1,
2025                 s->max_cert_list,
2026                 &ok);
2027
2028         if (!ok) return((int)n);
2029
2030         s->s3->tmp.cert_req=0;
2031
2032         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
2033                 {
2034                 s->s3->tmp.reuse_message=1;
2035                 /* If we get here we don't need any cached handshake records
2036                  * as we wont be doing client auth.
2037                  */
2038                 if (s->s3->handshake_buffer)
2039                         {
2040                         if (!ssl3_digest_cached_records(s))
2041                                 goto err;
2042                         }
2043                 return(1);
2044                 }
2045
2046         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
2047                 {
2048                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2049                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
2050                 goto err;
2051                 }
2052
2053         /* TLS does not like anon-DH with client cert */
2054         if (s->version > SSL3_VERSION)
2055                 {
2056                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
2057                         {
2058                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2059                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2060                         goto err;
2061                         }
2062                 }
2063
2064         p=d=(unsigned char *)s->init_msg;
2065
2066         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
2067                 {
2068                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2069                 goto err;
2070                 }
2071
2072         /* get the certificate types */
2073         ctype_num= *(p++);
2074         if (ctype_num > SSL3_CT_NUMBER)
2075                 ctype_num=SSL3_CT_NUMBER;
2076         for (i=0; i<ctype_num; i++)
2077                 s->s3->tmp.ctype[i]= p[i];
2078         p+=ctype_num;
2079         if (TLS1_get_version(s) >= TLS1_2_VERSION)
2080                 {
2081                 n2s(p, llen);
2082                 /* Check we have enough room for signature algorithms and
2083                  * following length value.
2084                  */
2085                 if ((unsigned long)(p - d + llen + 2) > n)
2086                         {
2087                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2088                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
2089                         goto err;
2090                         }
2091                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
2092                         {
2093                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2094                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2095                         goto err;
2096                         }
2097                 p += llen;
2098                 }
2099
2100         /* get the CA RDNs */
2101         n2s(p,llen);
2102 #if 0
2103 {
2104 FILE *out;
2105 out=fopen("/tmp/vsign.der","w");
2106 fwrite(p,1,llen,out);
2107 fclose(out);
2108 }
2109 #endif
2110
2111         if ((unsigned long)(p - d + llen) != n)
2112                 {
2113                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2114                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
2115                 goto err;
2116                 }
2117
2118         for (nc=0; nc<llen; )
2119                 {
2120                 n2s(p,l);
2121                 if ((l+nc+2) > llen)
2122                         {
2123                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2124                                 goto cont; /* netscape bugs */
2125                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2126                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2127                         goto err;
2128                         }
2129
2130                 q=p;
2131
2132                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2133                         {
2134                         /* If netscape tolerance is on, ignore errors */
2135                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2136                                 goto cont;
2137                         else
2138                                 {
2139                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2140                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2141                                 goto err;
2142                                 }
2143                         }
2144
2145                 if (q != (p+l))
2146                         {
2147                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2148                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2149                         goto err;
2150                         }
2151                 if (!sk_X509_NAME_push(ca_sk,xn))
2152                         {
2153                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2154                         goto err;
2155                         }
2156
2157                 p+=l;
2158                 nc+=l+2;
2159                 }
2160
2161         if (0)
2162                 {
2163 cont:
2164                 ERR_clear_error();
2165                 }
2166
2167         /* we should setup a certificate to return.... */
2168         s->s3->tmp.cert_req=1;
2169         s->s3->tmp.ctype_num=ctype_num;
2170         if (s->s3->tmp.ca_names != NULL)
2171                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2172         s->s3->tmp.ca_names=ca_sk;
2173         ca_sk=NULL;
2174
2175         ret=1;
2176 err:
2177         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2178         return(ret);
2179         }
2180
2181 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2182         {
2183         return(X509_NAME_cmp(*a,*b));
2184         }
2185 #ifndef OPENSSL_NO_TLSEXT
2186 int ssl3_get_new_session_ticket(SSL *s)
2187         {
2188         int ok,al,ret=0, ticklen;
2189         long n;
2190         const unsigned char *p;
2191         unsigned char *d;
2192
2193         n=s->method->ssl_get_message(s,
2194                 SSL3_ST_CR_SESSION_TICKET_A,
2195                 SSL3_ST_CR_SESSION_TICKET_B,
2196                 -1,
2197                 16384,
2198                 &ok);
2199
2200         if (!ok)
2201                 return((int)n);
2202
2203         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2204                 {
2205                 s->s3->tmp.reuse_message=1;
2206                 return(1);
2207                 }
2208         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2209                 {
2210                 al=SSL_AD_UNEXPECTED_MESSAGE;
2211                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2212                 goto f_err;
2213                 }
2214         if (n < 6)
2215                 {
2216                 /* need at least ticket_lifetime_hint + ticket length */
2217                 al = SSL_AD_DECODE_ERROR;
2218                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2219                 goto f_err;
2220                 }
2221
2222         p=d=(unsigned char *)s->init_msg;
2223         n2l(p, s->session->tlsext_tick_lifetime_hint);
2224         n2s(p, ticklen);
2225         /* ticket_lifetime_hint + ticket_length + ticket */
2226         if (ticklen + 6 != n)
2227                 {
2228                 al = SSL_AD_DECODE_ERROR;
2229                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2230                 goto f_err;
2231                 }
2232         if (s->session->tlsext_tick)
2233                 {
2234                 OPENSSL_free(s->session->tlsext_tick);
2235                 s->session->tlsext_ticklen = 0;
2236                 }
2237         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2238         if (!s->session->tlsext_tick)
2239                 {
2240                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2241                 goto err;
2242                 }
2243         memcpy(s->session->tlsext_tick, p, ticklen);
2244         s->session->tlsext_ticklen = ticklen;
2245         /* There are two ways to detect a resumed ticket sesion.
2246          * One is to set an appropriate session ID and then the server
2247          * must return a match in ServerHello. This allows the normal
2248          * client session ID matching to work and we know much
2249          * earlier that the ticket has been accepted.
2250          *
2251          * The other way is to set zero length session ID when the
2252          * ticket is presented and rely on the handshake to determine
2253          * session resumption.
2254          *
2255          * We choose the former approach because this fits in with
2256          * assumptions elsewhere in OpenSSL. The session ID is set
2257          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2258          * ticket.
2259          */
2260         EVP_Digest(p, ticklen,
2261                         s->session->session_id, &s->session->session_id_length,
2262 #ifndef OPENSSL_NO_SHA256
2263                                                         EVP_sha256(), NULL);
2264 #else
2265                                                         EVP_sha1(), NULL);
2266 #endif
2267         ret=1;
2268         return(ret);
2269 f_err:
2270         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2271 err:
2272         return(-1);
2273         }
2274
2275 int ssl3_get_cert_status(SSL *s)
2276         {
2277         int ok, al;
2278         unsigned long resplen,n;
2279         const unsigned char *p;
2280
2281         n=s->method->ssl_get_message(s,
2282                 SSL3_ST_CR_CERT_STATUS_A,
2283                 SSL3_ST_CR_CERT_STATUS_B,
2284                 SSL3_MT_CERTIFICATE_STATUS,
2285                 16384,
2286                 &ok);
2287
2288         if (!ok) return((int)n);
2289         if (n < 4)
2290                 {
2291                 /* need at least status type + length */
2292                 al = SSL_AD_DECODE_ERROR;
2293                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2294                 goto f_err;
2295                 }
2296         p = (unsigned char *)s->init_msg;
2297         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2298                 {
2299                 al = SSL_AD_DECODE_ERROR;
2300                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2301                 goto f_err;
2302                 }
2303         n2l3(p, resplen);
2304         if (resplen + 4 != n)
2305                 {
2306                 al = SSL_AD_DECODE_ERROR;
2307                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2308                 goto f_err;
2309                 }
2310         if (s->tlsext_ocsp_resp)
2311                 OPENSSL_free(s->tlsext_ocsp_resp);
2312         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2313         if (!s->tlsext_ocsp_resp)
2314                 {
2315                 al = SSL_AD_INTERNAL_ERROR;
2316                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2317                 goto f_err;
2318                 }
2319         s->tlsext_ocsp_resplen = resplen;
2320         if (s->ctx->tlsext_status_cb)
2321                 {
2322                 int ret;
2323                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2324                 if (ret == 0)
2325                         {
2326                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2327                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2328                         goto f_err;
2329                         }
2330                 if (ret < 0)
2331                         {
2332                         al = SSL_AD_INTERNAL_ERROR;
2333                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2334                         goto f_err;
2335                         }
2336                 }
2337         return 1;
2338 f_err:
2339         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2340         return(-1);
2341         }
2342 #endif
2343
2344 int ssl3_get_server_done(SSL *s)
2345         {
2346         int ok,ret=0;
2347         long n;
2348
2349         n=s->method->ssl_get_message(s,
2350                 SSL3_ST_CR_SRVR_DONE_A,
2351                 SSL3_ST_CR_SRVR_DONE_B,
2352                 SSL3_MT_SERVER_DONE,
2353                 30, /* should be very small, like 0 :-) */
2354                 &ok);
2355
2356         if (!ok) return((int)n);
2357         if (n > 0)
2358                 {
2359                 /* should contain no data */
2360                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2361                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2362                 return -1;
2363                 }
2364         ret=1;
2365         return(ret);
2366         }
2367
2368
2369 int ssl3_send_client_key_exchange(SSL *s)
2370         {
2371         unsigned char *p,*d;
2372         int n;
2373         unsigned long alg_k;
2374 #ifndef OPENSSL_NO_RSA
2375         unsigned char *q;
2376         EVP_PKEY *pkey=NULL;
2377 #endif
2378 #ifndef OPENSSL_NO_KRB5
2379         KSSL_ERR kssl_err;
2380 #endif /* OPENSSL_NO_KRB5 */
2381 #ifndef OPENSSL_NO_ECDH
2382         EC_KEY *clnt_ecdh = NULL;
2383         const EC_POINT *srvr_ecpoint = NULL;
2384         EVP_PKEY *srvr_pub_pkey = NULL;
2385         unsigned char *encodedPoint = NULL;
2386         int encoded_pt_len = 0;
2387         BN_CTX * bn_ctx = NULL;
2388 #endif
2389
2390         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2391                 {
2392                 d=(unsigned char *)s->init_buf->data;
2393                 p= &(d[4]);
2394
2395                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2396
2397                 /* Fool emacs indentation */
2398                 if (0) {}
2399 #ifndef OPENSSL_NO_RSA
2400                 else if (alg_k & SSL_kRSA)
2401                         {
2402                         RSA *rsa;
2403                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2404
2405                         if (s->session->sess_cert == NULL)
2406                                 {
2407                                 /* We should always have a server certificate with SSL_kRSA. */
2408                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2409                                 goto err;
2410                                 }
2411
2412                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2413                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2414                         else
2415                                 {
2416                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2417                                 if ((pkey == NULL) ||
2418                                         (pkey->type != EVP_PKEY_RSA) ||
2419                                         (pkey->pkey.rsa == NULL))
2420                                         {
2421                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2422                                         goto err;
2423                                         }
2424                                 rsa=pkey->pkey.rsa;
2425                                 EVP_PKEY_free(pkey);
2426                                 }
2427
2428                         tmp_buf[0]=s->client_version>>8;
2429                         tmp_buf[1]=s->client_version&0xff;
2430                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2431                                         goto err;
2432
2433                         s->session->master_key_length=sizeof tmp_buf;
2434
2435                         q=p;
2436                         /* Fix buf for TLS and beyond */
2437                         if (s->version > SSL3_VERSION)
2438                                 p+=2;
2439                         n=RSA_public_encrypt(sizeof tmp_buf,
2440                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2441 #ifdef PKCS1_CHECK
2442                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2443                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2444 #endif
2445                         if (n <= 0)
2446                                 {
2447                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2448                                 goto err;
2449                                 }
2450
2451                         /* Fix buf for TLS and beyond */
2452                         if (s->version > SSL3_VERSION)
2453                                 {
2454                                 s2n(n,q);
2455                                 n+=2;
2456                                 }
2457
2458                         s->session->master_key_length=
2459                                 s->method->ssl3_enc->generate_master_secret(s,
2460                                         s->session->master_key,
2461                                         tmp_buf,sizeof tmp_buf);
2462                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2463                         }
2464 #endif
2465 #ifndef OPENSSL_NO_KRB5
2466                 else if (alg_k & SSL_kKRB5)
2467                         {
2468                         krb5_error_code krb5rc;
2469                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2470                         /*  krb5_data   krb5_ap_req;  */
2471                         krb5_data       *enc_ticket;
2472                         krb5_data       authenticator, *authp = NULL;
2473                         EVP_CIPHER_CTX  ciph_ctx;
2474                         const EVP_CIPHER *enc = NULL;
2475                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2476                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2477                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2478                                                 + EVP_MAX_IV_LENGTH];
2479                         int             padl, outl = sizeof(epms);
2480
2481                         EVP_CIPHER_CTX_init(&ciph_ctx);
2482
2483 #ifdef KSSL_DEBUG
2484                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2485                                 alg_k, SSL_kKRB5);
2486 #endif  /* KSSL_DEBUG */
2487
2488                         authp = NULL;
2489 #ifdef KRB5SENDAUTH
2490                         if (KRB5SENDAUTH)  authp = &authenticator;
2491 #endif  /* KRB5SENDAUTH */
2492
2493                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2494                                 &kssl_err);
2495                         enc = kssl_map_enc(kssl_ctx->enctype);
2496                         if (enc == NULL)
2497                             goto err;
2498 #ifdef KSSL_DEBUG
2499                         {
2500                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2501                         if (krb5rc && kssl_err.text)
2502                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2503                         }
2504 #endif  /* KSSL_DEBUG */
2505
2506                         if (krb5rc)
2507                                 {
2508                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2509                                                 SSL_AD_HANDSHAKE_FAILURE);
2510                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2511                                                 kssl_err.reason);
2512                                 goto err;
2513                                 }
2514
2515                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2516                         **  in place of RFC 2712 KerberosWrapper, as in:
2517                         **
2518                         **  Send ticket (copy to *p, set n = length)
2519                         **  n = krb5_ap_req.length;
2520                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2521                         **  if (krb5_ap_req.data)
2522                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2523                         **
2524                         **  Now using real RFC 2712 KerberosWrapper
2525                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2526                         **  Note: 2712 "opaque" types are here replaced
2527                         **  with a 2-byte length followed by the value.
2528                         **  Example:
2529                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2530                         **  Where "xx xx" = length bytes.  Shown here with
2531                         **  optional authenticator omitted.
2532                         */
2533
2534                         /*  KerberosWrapper.Ticket              */
2535                         s2n(enc_ticket->length,p);
2536                         memcpy(p, enc_ticket->data, enc_ticket->length);
2537                         p+= enc_ticket->length;
2538                         n = enc_ticket->length + 2;
2539
2540                         /*  KerberosWrapper.Authenticator       */
2541                         if (authp  &&  authp->length)
2542                                 {
2543                                 s2n(authp->length,p);
2544                                 memcpy(p, authp->data, authp->length);
2545                                 p+= authp->length;
2546                                 n+= authp->length + 2;
2547
2548                                 free(authp->data);
2549                                 authp->data = NULL;
2550                                 authp->length = 0;
2551                                 }
2552                         else
2553                                 {
2554                                 s2n(0,p);/*  null authenticator length  */
2555                                 n+=2;
2556                                 }
2557
2558                             tmp_buf[0]=s->client_version>>8;
2559                             tmp_buf[1]=s->client_version&0xff;
2560                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2561                                 goto err;
2562
2563                         /*  20010420 VRS.  Tried it this way; failed.
2564                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2565                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2566                         **                              kssl_ctx->length);
2567                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2568                         */
2569
2570                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2571                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2572                                 kssl_ctx->key,iv);
2573                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2574                                 sizeof tmp_buf);
2575                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2576                         outl += padl;
2577                         if (outl > (int)sizeof epms)
2578                                 {
2579                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2580                                 goto err;
2581                                 }
2582                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2583
2584                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2585                         s2n(outl,p);
2586                         memcpy(p, epms, outl);
2587                         p+=outl;
2588                         n+=outl + 2;
2589
2590                         s->session->master_key_length=
2591                                 s->method->ssl3_enc->generate_master_secret(s,
2592                                         s->session->master_key,
2593                                         tmp_buf, sizeof tmp_buf);
2594
2595                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2596                         OPENSSL_cleanse(epms, outl);
2597                         }
2598 #endif
2599 #ifndef OPENSSL_NO_DH
2600                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2601                         {
2602                         DH *dh_srvr,*dh_clnt;
2603
2604                         if (s->session->sess_cert == NULL)
2605                                 {
2606                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2607                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2608                                 goto err;
2609                                 }
2610
2611                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2612                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2613                         else
2614                                 {
2615                                 /* we get them from the cert */
2616                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2617                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2618                                 goto err;
2619                                 }
2620
2621                         /* generate a new random key */
2622                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2623                                 {
2624                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2625                                 goto err;
2626                                 }
2627                         if (!DH_generate_key(dh_clnt))
2628                                 {
2629                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2630                                 DH_free(dh_clnt);
2631                                 goto err;
2632                                 }
2633
2634                         /* use the 'p' output buffer for the DH key, but
2635                          * make sure to clear it out afterwards */
2636
2637                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2638
2639                         if (n <= 0)
2640                                 {
2641                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2642                                 DH_free(dh_clnt);
2643                                 goto err;
2644                                 }
2645
2646                         /* generate master key from the result */
2647                         s->session->master_key_length=
2648                                 s->method->ssl3_enc->generate_master_secret(s,
2649                                         s->session->master_key,p,n);
2650                         /* clean up */
2651                         memset(p,0,n);
2652
2653                         /* send off the data */
2654                         n=BN_num_bytes(dh_clnt->pub_key);
2655                         s2n(n,p);
2656                         BN_bn2bin(dh_clnt->pub_key,p);
2657                         n+=2;
2658
2659                         DH_free(dh_clnt);
2660
2661                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2662                         }
2663 #endif
2664
2665 #ifndef OPENSSL_NO_ECDH
2666                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2667                         {
2668                         const EC_GROUP *srvr_group = NULL;
2669                         EC_KEY *tkey;
2670                         int ecdh_clnt_cert = 0;
2671                         int field_size = 0;
2672
2673                         if (s->session->sess_cert == NULL)
2674                                 {
2675                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2676                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2677                                 goto err;
2678                                 }
2679
2680                         /* Did we send out the client's
2681                          * ECDH share for use in premaster
2682                          * computation as part of client certificate?
2683                          * If so, set ecdh_clnt_cert to 1.
2684                          */
2685                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2686                                 {
2687                                 /* XXX: For now, we do not support client
2688                                  * authentication using ECDH certificates.
2689                                  * To add such support, one needs to add
2690                                  * code that checks for appropriate
2691                                  * conditions and sets ecdh_clnt_cert to 1.
2692                                  * For example, the cert have an ECC
2693                                  * key on the same curve as the server's
2694                                  * and the key should be authorized for
2695                                  * key agreement.
2696                                  *
2697                                  * One also needs to add code in ssl3_connect
2698                                  * to skip sending the certificate verify
2699                                  * message.
2700                                  *
2701                                  * if ((s->cert->key->privatekey != NULL) &&
2702                                  *     (s->cert->key->privatekey->type ==
2703                                  *      EVP_PKEY_EC) && ...)
2704                                  * ecdh_clnt_cert = 1;
2705                                  */
2706                                 }
2707
2708                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2709                                 {
2710                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2711                                 }
2712                         else
2713                                 {
2714                                 /* Get the Server Public Key from Cert */
2715                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2716                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2717                                 if ((srvr_pub_pkey == NULL) ||
2718                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2719                                     (srvr_pub_pkey->pkey.ec == NULL))
2720                                         {
2721                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2722                                             ERR_R_INTERNAL_ERROR);
2723                                         goto err;
2724                                         }
2725
2726                                 tkey = srvr_pub_pkey->pkey.ec;
2727                                 }
2728
2729                         srvr_group   = EC_KEY_get0_group(tkey);
2730                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2731
2732                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2733                                 {
2734                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2735                                     ERR_R_INTERNAL_ERROR);
2736                                 goto err;
2737                                 }
2738
2739                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2740                                 {
2741                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2742                                 goto err;
2743                                 }
2744
2745                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2746                                 {
2747                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2748                                 goto err;
2749                                 }
2750                         if (ecdh_clnt_cert)
2751                                 {
2752                                 /* Reuse key info from our certificate
2753                                  * We only need our private key to perform
2754                                  * the ECDH computation.
2755                                  */
2756                                 const BIGNUM *priv_key;
2757                                 tkey = s->cert->key->privatekey->pkey.ec;
2758                                 priv_key = EC_KEY_get0_private_key(tkey);
2759                                 if (priv_key == NULL)
2760                                         {
2761                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2762                                         goto err;
2763                                         }
2764                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2765                                         {
2766                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2767                                         goto err;
2768                                         }
2769                                 }
2770                         else
2771                                 {
2772                                 /* Generate a new ECDH key pair */
2773                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2774                                         {
2775                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2776                                         goto err;
2777                                         }
2778                                 }
2779
2780                         /* use the 'p' output buffer for the ECDH key, but
2781                          * make sure to clear it out afterwards
2782                          */
2783
2784                         field_size = EC_GROUP_get_degree(srvr_group);
2785                         if (field_size <= 0)
2786                                 {
2787                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2788                                        ERR_R_ECDH_LIB);
2789                                 goto err;
2790                                 }
2791                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2792                         if (n <= 0)
2793                                 {
2794                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2795                                        ERR_R_ECDH_LIB);
2796                                 goto err;
2797                                 }
2798
2799                         /* generate master key from the result */
2800                         s->session->master_key_length = s->method->ssl3_enc \
2801                             -> generate_master_secret(s,
2802                                 s->session->master_key,
2803                                 p, n);
2804
2805                         memset(p, 0, n); /* clean up */
2806
2807                         if (ecdh_clnt_cert)
2808                                 {
2809                                 /* Send empty client key exch message */
2810                                 n = 0;
2811                                 }
2812                         else
2813                                 {
2814                                 /* First check the size of encoding and
2815                                  * allocate memory accordingly.
2816                                  */
2817                                 encoded_pt_len =
2818                                     EC_POINT_point2oct(srvr_group,
2819                                         EC_KEY_get0_public_key(clnt_ecdh),
2820                                         POINT_CONVERSION_UNCOMPRESSED,
2821                                         NULL, 0, NULL);
2822
2823                                 encodedPoint = (unsigned char *)
2824                                     OPENSSL_malloc(encoded_pt_len *
2825                                         sizeof(unsigned char));
2826                                 bn_ctx = BN_CTX_new();
2827                                 if ((encodedPoint == NULL) ||
2828                                     (bn_ctx == NULL))
2829                                         {
2830                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2831                                         goto err;
2832                                         }
2833
2834                                 /* Encode the public key */
2835                                 n = EC_POINT_point2oct(srvr_group,
2836                                     EC_KEY_get0_public_key(clnt_ecdh),
2837                                     POINT_CONVERSION_UNCOMPRESSED,
2838                                     encodedPoint, encoded_pt_len, bn_ctx);
2839
2840                                 *p = n; /* length of encoded point */
2841                                 /* Encoded point will be copied here */
2842                                 p += 1;
2843                                 /* copy the point */
2844                                 memcpy((unsigned char *)p, encodedPoint, n);
2845                                 /* increment n to account for length field */
2846                                 n += 1;
2847                                 }
2848
2849                         /* Free allocated memory */
2850                         BN_CTX_free(bn_ctx);
2851                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2852                         if (clnt_ecdh != NULL)
2853                                  EC_KEY_free(clnt_ecdh);
2854                         EVP_PKEY_free(srvr_pub_pkey);
2855                         }
2856 #endif /* !OPENSSL_NO_ECDH */
2857                 else if (alg_k & SSL_kGOST)
2858                         {
2859                         /* GOST key exchange message creation */
2860                         EVP_PKEY_CTX *pkey_ctx;
2861                         X509 *peer_cert;
2862                         size_t msglen;
2863                         unsigned int md_len;
2864                         int keytype;
2865                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2866                         EVP_MD_CTX *ukm_hash;
2867                         EVP_PKEY *pub_key;
2868
2869                         /* Get server sertificate PKEY and create ctx from it */
2870                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2871                         if (!peer_cert)
2872                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2873                         if (!peer_cert)         {
2874                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2875                                         goto err;
2876                                 }
2877
2878                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2879                         /* If we have send a certificate, and certificate key
2880
2881                          * parameters match those of server certificate, use
2882                          * certificate key for key exchange
2883                          */
2884
2885                          /* Otherwise, generate ephemeral key pair */
2886
2887                         EVP_PKEY_encrypt_init(pkey_ctx);
2888                           /* Generate session key */
2889                     RAND_bytes(premaster_secret,32);
2890                         /* If we have client certificate, use its secret as peer key */
2891                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2892                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2893                                         /* If there was an error - just ignore it. Ephemeral key
2894                                         * would be used
2895                                         */
2896                                         ERR_clear_error();
2897                                 }
2898                         }
2899                         /* Compute shared IV and store it in algorithm-specific
2900                          * context data */
2901                         ukm_hash = EVP_MD_CTX_create();
2902                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2903                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2904                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2905                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2906                         EVP_MD_CTX_destroy(ukm_hash);
2907                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2908                                 8,shared_ukm)<0) {
2909                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2910                                                 SSL_R_LIBRARY_BUG);
2911                                         goto err;
2912                                 }
2913                         /* Make GOST keytransport blob message */
2914                         /*Encapsulate it into sequence */
2915                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2916                         msglen=255;
2917                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2918                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2919                                         SSL_R_LIBRARY_BUG);
2920                                 goto err;
2921                         }
2922                         if (msglen >= 0x80)
2923                                 {
2924                                 *(p++)=0x81;
2925                                 *(p++)= msglen & 0xff;
2926                                 n=msglen+3;
2927                                 }
2928                         else
2929                                 {
2930                                 *(p++)= msglen & 0xff;
2931                                 n=msglen+2;
2932                                 }
2933                         memcpy(p, tmp, msglen);
2934                         /* Check if pubkey from client certificate was used */
2935                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2936                                 {
2937                                 /* Set flag "skip certificate verify" */
2938                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2939                                 }
2940                         EVP_PKEY_CTX_free(pkey_ctx);
2941                         s->session->master_key_length=
2942                                 s->method->ssl3_enc->generate_master_secret(s,
2943                                         s->session->master_key,premaster_secret,32);
2944                         EVP_PKEY_free(pub_key);
2945
2946                         }
2947 #ifndef OPENSSL_NO_SRP
2948                 else if (alg_k & SSL_kSRP)
2949                         {
2950                         if (s->srp_ctx.A != NULL)
2951                                 {
2952                                 /* send off the data */
2953                                 n=BN_num_bytes(s->srp_ctx.A);
2954                                 s2n(n,p);
2955                                 BN_bn2bin(s->srp_ctx.A,p);
2956                                 n+=2;
2957                                 }
2958                         else
2959                                 {
2960                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2961                                 goto err;
2962                                 }
2963                         if (s->session->srp_username != NULL)
2964                                 OPENSSL_free(s->session->srp_username);
2965                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2966                         if (s->session->srp_username == NULL)
2967                                 {
2968                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2969                                         ERR_R_MALLOC_FAILURE);
2970                                 goto err;
2971                                 }
2972
2973                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
2974                                 {
2975                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2976                                 goto err;
2977                                 }
2978                         }
2979 #endif
2980 #ifndef OPENSSL_NO_PSK
2981                 else if (alg_k & SSL_kPSK)
2982                         {
2983                         /* The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes
2984                          * to return a \0-terminated identity. The last byte
2985                          * is for us for simulating strnlen. */
2986                         char identity[PSK_MAX_IDENTITY_LEN + 2];
2987                         size_t identity_len;
2988                         unsigned char *t = NULL;
2989                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
2990                         unsigned int pre_ms_len = 0, psk_len = 0;
2991                         int psk_err = 1;
2992
2993                         n = 0;
2994                         if (s->psk_client_callback == NULL)
2995                                 {
2996                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2997                                         SSL_R_PSK_NO_CLIENT_CB);
2998                                 goto err;
2999                                 }
3000
3001                         memset(identity, 0, sizeof(identity));
3002                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
3003                                 identity, sizeof(identity) - 1,
3004                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
3005                         if (psk_len > PSK_MAX_PSK_LEN)
3006                                 {
3007                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3008                                         ERR_R_INTERNAL_ERROR);
3009                                 goto psk_err;
3010                                 }
3011                         else if (psk_len == 0)
3012                                 {
3013                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3014                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
3015                                 goto psk_err;
3016                                 }
3017                         identity[PSK_MAX_IDENTITY_LEN + 1] = '\0';
3018                         identity_len = strlen(identity);
3019                         if (identity_len > PSK_MAX_IDENTITY_LEN)
3020                                 {
3021                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3022                                         ERR_R_INTERNAL_ERROR);
3023                                 goto psk_err;
3024                                 }
3025                         /* create PSK pre_master_secret */
3026                         pre_ms_len = 2+psk_len+2+psk_len;
3027                         t = psk_or_pre_ms;
3028                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
3029                         s2n(psk_len, t);
3030                         memset(t, 0, psk_len);
3031                         t+=psk_len;
3032                         s2n(psk_len, t);
3033
3034                         if (s->session->psk_identity_hint != NULL)
3035                                 OPENSSL_free(s->session->psk_identity_hint);
3036                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
3037                         if (s->ctx->psk_identity_hint != NULL &&
3038                                 s->session->psk_identity_hint == NULL)
3039                                 {
3040                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3041                                         ERR_R_MALLOC_FAILURE);
3042                                 goto psk_err;
3043                                 }
3044
3045                         if (s->session->psk_identity != NULL)
3046                                 OPENSSL_free(s->session->psk_identity);
3047                         s->session->psk_identity = BUF_strdup(identity);
3048                         if (s->session->psk_identity == NULL)
3049                                 {
3050                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3051                                         ERR_R_MALLOC_FAILURE);
3052                                 goto psk_err;
3053                                 }
3054
3055                         s->session->master_key_length =
3056                                 s->method->ssl3_enc->generate_master_secret(s,
3057                                         s->session->master_key,
3058                                         psk_or_pre_ms, pre_ms_len);
3059                         s2n(identity_len, p);
3060                         memcpy(p, identity, identity_len);
3061                         n = 2 + identity_len;
3062                         psk_err = 0;
3063                 psk_err:
3064                         OPENSSL_cleanse(identity, sizeof(identity));
3065                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
3066                         if (psk_err != 0)
3067                                 {
3068                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3069                                 goto err;
3070                                 }
3071                         }
3072 #endif
3073                 else
3074                         {
3075                         ssl3_send_alert(s, SSL3_AL_FATAL,
3076                             SSL_AD_HANDSHAKE_FAILURE);
3077                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3078                             ERR_R_INTERNAL_ERROR);
3079                         goto err;
3080                         }
3081
3082                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
3083                 l2n3(n,d);
3084
3085                 s->state=SSL3_ST_CW_KEY_EXCH_B;
3086                 /* number of bytes to write */
3087                 s->init_num=n+4;
3088                 s->init_off=0;
3089                 }
3090
3091         /* SSL3_ST_CW_KEY_EXCH_B */
3092         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3093 err:
3094 #ifndef OPENSSL_NO_ECDH
3095         BN_CTX_free(bn_ctx);
3096         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
3097         if (clnt_ecdh != NULL)
3098                 EC_KEY_free(clnt_ecdh);
3099         EVP_PKEY_free(srvr_pub_pkey);
3100 #endif
3101         return(-1);
3102         }
3103
3104 int ssl3_send_client_verify(SSL *s)
3105         {
3106         unsigned char *p,*d;
3107         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
3108         EVP_PKEY *pkey;
3109         EVP_PKEY_CTX *pctx=NULL;
3110         EVP_MD_CTX mctx;
3111         unsigned u=0;
3112         unsigned long n;
3113         int j;
3114
3115         EVP_MD_CTX_init(&mctx);
3116
3117         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
3118                 {
3119                 d=(unsigned char *)s->init_buf->data;
3120                 p= &(d[4]);
3121                 pkey=s->cert->key->privatekey;
3122 /* Create context from key and test if sha1 is allowed as digest */
3123                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
3124                 EVP_PKEY_sign_init(pctx);
3125                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
3126                         {
3127                         if (TLS1_get_version(s) < TLS1_2_VERSION)
3128                                 s->method->ssl3_enc->cert_verify_mac(s,
3129                                                 NID_sha1,
3130                                                 &(data[MD5_DIGEST_LENGTH]));
3131                         }
3132                 else
3133                         {
3134                         ERR_clear_error();
3135                         }
3136                 /* For TLS v1.2 send signature algorithm and signature
3137                  * using agreed digest and cached handshake records.
3138                  */
3139                 if (TLS1_get_version(s) >= TLS1_2_VERSION)
3140                         {
3141                         long hdatalen = 0;
3142                         void *hdata;
3143                         const EVP_MD *md = s->cert->key->digest;
3144                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
3145                                                                 &hdata);
3146                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
3147                                 {
3148                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3149                                                 ERR_R_INTERNAL_ERROR);
3150                                 goto err;
3151                                 }
3152                         p += 2;
3153 #ifdef SSL_DEBUG
3154                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3155                                                         EVP_MD_name(md));
3156 #endif
3157                         if (!EVP_SignInit_ex(&mctx, md, NULL)
3158                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3159                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
3160                                 {
3161                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3162                                                 ERR_R_EVP_LIB);
3163                                 goto err;
3164                                 }
3165                         s2n(u,p);
3166                         n = u + 4;
3167                         if (!ssl3_digest_cached_records(s))
3168                                 goto err;
3169                         }
3170                 else
3171 #ifndef OPENSSL_NO_RSA
3172                 if (pkey->type == EVP_PKEY_RSA)
3173                         {
3174                         s->method->ssl3_enc->cert_verify_mac(s,
3175                                 NID_md5,
3176                                 &(data[0]));
3177                         if (RSA_sign(NID_md5_sha1, data,
3178                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
3179                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3180                                 {
3181                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3182                                 goto err;
3183                                 }
3184                         s2n(u,p);
3185                         n=u+2;
3186                         }
3187                 else
3188 #endif
3189 #ifndef OPENSSL_NO_DSA
3190                         if (pkey->type == EVP_PKEY_DSA)
3191                         {
3192                         if (!DSA_sign(pkey->save_type,
3193                                 &(data[MD5_DIGEST_LENGTH]),
3194                                 SHA_DIGEST_LENGTH,&(p[2]),
3195                                 (unsigned int *)&j,pkey->pkey.dsa))
3196                                 {
3197                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3198                                 goto err;
3199                                 }
3200                         s2n(j,p);
3201                         n=j+2;
3202                         }
3203                 else
3204 #endif
3205 #ifndef OPENSSL_NO_ECDSA
3206                         if (pkey->type == EVP_PKEY_EC)
3207                         {
3208                         if (!ECDSA_sign(pkey->save_type,
3209                                 &(data[MD5_DIGEST_LENGTH]),
3210                                 SHA_DIGEST_LENGTH,&(p[2]),
3211                                 (unsigned int *)&j,pkey->pkey.ec))
3212                                 {
3213                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3214                                     ERR_R_ECDSA_LIB);
3215                                 goto err;
3216                                 }
3217                         s2n(j,p);
3218                         n=j+2;
3219                         }
3220                 else
3221 #endif
3222                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3223                 {
3224                 unsigned char signbuf[64];
3225                 int i;
3226                 size_t sigsize=64;
3227                 s->method->ssl3_enc->cert_verify_mac(s,
3228                         NID_id_GostR3411_94,
3229                         data);
3230                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3231                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3232                         ERR_R_INTERNAL_ERROR);
3233                         goto err;
3234                 }
3235                 for (i=63,j=0; i>=0; j++, i--) {
3236                         p[2+j]=signbuf[i];
3237                 }
3238                 s2n(j,p);
3239                 n=j+2;
3240                 }
3241                 else
3242                 {
3243                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3244                         goto err;
3245                 }
3246                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
3247                 l2n3(n,d);
3248
3249                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3250                 s->init_num=(int)n+4;
3251                 s->init_off=0;
3252                 }
3253         EVP_MD_CTX_cleanup(&mctx);
3254         EVP_PKEY_CTX_free(pctx);
3255         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3256 err:
3257         EVP_MD_CTX_cleanup(&mctx);
3258         EVP_PKEY_CTX_free(pctx);
3259         return(-1);
3260         }
3261
3262 int ssl3_send_client_certificate(SSL *s)
3263         {
3264         X509 *x509=NULL;
3265         EVP_PKEY *pkey=NULL;
3266         int i;
3267         unsigned long l;
3268
3269         if (s->state == SSL3_ST_CW_CERT_A)
3270                 {
3271                 if ((s->cert == NULL) ||
3272                         (s->cert->key->x509 == NULL) ||
3273                         (s->cert->key->privatekey == NULL))
3274                         s->state=SSL3_ST_CW_CERT_B;
3275                 else
3276                         s->state=SSL3_ST_CW_CERT_C;
3277                 }
3278
3279         /* We need to get a client cert */
3280         if (s->state == SSL3_ST_CW_CERT_B)
3281                 {
3282                 /* If we get an error, we need to
3283                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3284                  * We then get retied later */
3285                 i=0;
3286                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3287                 if (i < 0)
3288                         {
3289                         s->rwstate=SSL_X509_LOOKUP;
3290                         return(-1);
3291                         }
3292                 s->rwstate=SSL_NOTHING;
3293                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3294                         {
3295                         s->state=SSL3_ST_CW_CERT_B;
3296                         if (    !SSL_use_certificate(s,x509) ||
3297                                 !SSL_use_PrivateKey(s,pkey))
3298                                 i=0;
3299                         }
3300                 else if (i == 1)
3301                         {
3302                         i=0;
3303                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3304                         }
3305
3306                 if (x509 != NULL) X509_free(x509);
3307                 if (pkey != NULL) EVP_PKEY_free(pkey);
3308                 if (i == 0)
3309                         {
3310                         if (s->version == SSL3_VERSION)
3311                                 {
3312                                 s->s3->tmp.cert_req=0;
3313                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3314                                 return(1);
3315                                 }
3316                         else
3317                                 {
3318                                 s->s3->tmp.cert_req=2;
3319                                 }
3320                         }
3321
3322                 /* Ok, we have a cert */
3323                 s->state=SSL3_ST_CW_CERT_C;
3324                 }
3325
3326         if (s->state == SSL3_ST_CW_CERT_C)
3327                 {
3328                 s->state=SSL3_ST_CW_CERT_D;
3329                 l=ssl3_output_cert_chain(s,
3330                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
3331                 s->init_num=(int)l;
3332                 s->init_off=0;
3333                 }
3334         /* SSL3_ST_CW_CERT_D */
3335         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
3336         }
3337
3338 #define has_bits(i,m)   (((i)&(m)) == (m))
3339
3340 int ssl3_check_cert_and_algorithm(SSL *s)
3341         {
3342         int i,idx;
3343         long alg_k,alg_a;
3344         EVP_PKEY *pkey=NULL;
3345         SESS_CERT *sc;
3346 #ifndef OPENSSL_NO_RSA
3347         RSA *rsa;
3348 #endif
3349 #ifndef OPENSSL_NO_DH
3350         DH *dh;
3351 #endif
3352
3353         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3354         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3355
3356         /* we don't have a certificate */
3357         if ((alg_a & (SSL_aDH|SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3358                 return(1);
3359
3360         sc=s->session->sess_cert;
3361         if (sc == NULL)
3362                 {
3363                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3364                 goto err;
3365                 }
3366
3367 #ifndef OPENSSL_NO_RSA
3368         rsa=s->session->sess_cert->peer_rsa_tmp;
3369 #endif
3370 #ifndef OPENSSL_NO_DH
3371         dh=s->session->sess_cert->peer_dh_tmp;
3372 #endif
3373
3374         /* This is the passed certificate */
3375
3376         idx=sc->peer_cert_type;
3377 #ifndef OPENSSL_NO_ECDH
3378         if (idx == SSL_PKEY_ECC)
3379                 {
3380                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3381                                                                 s) == 0)
3382                         { /* check failed */
3383                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3384                         goto f_err;
3385                         }
3386                 else
3387                         {
3388                         return 1;
3389                         }
3390                 }
3391 #endif
3392         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3393         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3394         EVP_PKEY_free(pkey);
3395
3396
3397         /* Check that we have a certificate if we require one */
3398         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3399                 {
3400                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3401                 goto f_err;
3402                 }
3403 #ifndef OPENSSL_NO_DSA
3404         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3405                 {
3406                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3407                 goto f_err;
3408                 }
3409 #endif
3410 #ifndef OPENSSL_NO_RSA
3411         if ((alg_k & SSL_kRSA) &&
3412                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3413                 {
3414                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3415                 goto f_err;
3416                 }
3417 #endif
3418 #ifndef OPENSSL_NO_DH
3419         if ((alg_k & SSL_kEDH) &&
3420                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3421                 {
3422                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3423                 goto f_err;
3424                 }
3425         else if ((alg_k & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3426                 {
3427                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3428                 goto f_err;
3429                 }
3430 #ifndef OPENSSL_NO_DSA
3431         else if ((alg_k & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3432                 {
3433                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3434                 goto f_err;
3435                 }
3436 #endif
3437 #endif
3438
3439         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3440                 {
3441 #ifndef OPENSSL_NO_RSA
3442                 if (alg_k & SSL_kRSA)
3443                         {
3444                         if (rsa == NULL
3445                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3446                                 {
3447                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3448                                 goto f_err;
3449                                 }
3450                         }
3451                 else
3452 #endif
3453 #ifndef OPENSSL_NO_DH
3454                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3455                             {
3456                             if (dh == NULL
3457                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3458                                 {
3459                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3460                                 goto f_err;
3461                                 }
3462                         }
3463                 else
3464 #endif
3465                         {
3466                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3467                         goto f_err;
3468                         }
3469                 }
3470         return(1);
3471 f_err:
3472         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3473 err:
3474         return(0);
3475         }
3476
3477 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
3478 int ssl3_send_next_proto(SSL *s)
3479         {
3480         unsigned int len, padding_len;
3481         unsigned char *d;
3482
3483         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3484                 {
3485                 len = s->next_proto_negotiated_len;
3486                 padding_len = 32 - ((len + 2) % 32);
3487                 d = (unsigned char *)s->init_buf->data;
3488                 d[4] = len;
3489                 memcpy(d + 5, s->next_proto_negotiated, len);
3490                 d[5 + len] = padding_len;
3491                 memset(d + 6 + len, 0, padding_len);
3492                 *(d++)=SSL3_MT_NEXT_PROTO;
3493                 l2n3(2 + len + padding_len, d);
3494                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3495                 s->init_num = 4 + 2 + len + padding_len;
3496                 s->init_off = 0;
3497                 }
3498
3499         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3500 }
3501 #endif  /* !OPENSSL_NO_TLSEXT && !OPENSSL_NO_NEXTPROTONEG */
3502
3503 /* Check to see if handshake is full or resumed. Usually this is just a
3504  * case of checking to see if a cache hit has occurred. In the case of
3505  * session tickets we have to check the next message to be sure.
3506  */
3507
3508 #ifndef OPENSSL_NO_TLSEXT
3509 int ssl3_check_finished(SSL *s)
3510         {
3511         int ok;
3512         long n;
3513         /* If we have no ticket it cannot be a resumed session. */
3514         if (!s->session->tlsext_tick)
3515                 return 1;
3516         /* this function is called when we really expect a Certificate
3517          * message, so permit appropriate message length */
3518         n=s->method->ssl_get_message(s,
3519                 SSL3_ST_CR_CERT_A,
3520                 SSL3_ST_CR_CERT_B,
3521                 -1,
3522                 s->max_cert_list,
3523                 &ok);
3524         if (!ok) return((int)n);
3525         s->s3->tmp.reuse_message = 1;
3526         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3527                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3528                 return 2;
3529
3530         return 1;
3531         }
3532 #endif
3533
3534 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3535         {
3536         int i = 0;
3537 #ifndef OPENSSL_NO_ENGINE
3538         if (s->ctx->client_cert_engine)
3539                 {
3540                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3541                                                 SSL_get_client_CA_list(s),
3542                                                 px509, ppkey, NULL, NULL, NULL);
3543                 if (i != 0)
3544                         return i;
3545                 }
3546 #endif
3547         if (s->ctx->client_cert_cb)
3548                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3549         return i;
3550         }