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                                 {
 310                                         s->state=SSL3_ST_CR_CERT_A;
 311                                 }
 312                         s->init_num=0;
 313                         break;
 314                 case SSL3_ST_CR_CERT_A:
 315                 case SSL3_ST_CR_CERT_B:
 316 #ifndef OPENSSL_NO_TLSEXT
 317                         ret=ssl3_check_finished(s);
 318                         if (ret <= 0) goto end;
 319                         if (ret == 2)
 320                                 {
 321                                 s->hit = 1;
 322                                 if (s->tlsext_ticket_expected)
 323                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 324                                 else
 325                                         s->state=SSL3_ST_CR_FINISHED_A;
 326                                 s->init_num=0;
 327                                 break;
 328                                 }
 329 #endif
 330                         /* Check if it is anon DH/ECDH, SRP auth */
 331                         /* or PSK */
 332                         if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP)) &&
 333                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 334                                 {
 335                                 ret=ssl3_get_server_certificate(s);
 336                                 if (ret <= 0) goto end;
 337 #ifndef OPENSSL_NO_TLSEXT
 338                                 if (s->tlsext_status_expected)
 339                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 340                                 else
 341                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 342                                 }
 343                         else
 344                                 {
 345                                 skip = 1;
 346                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 347                                 }
 348 #else
 349                                 }
 350                         else
 351                                 skip=1;
 352
 353                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 354 #endif
 355                         s->init_num=0;
 356                         break;
 357
 358                 case SSL3_ST_CR_KEY_EXCH_A:
 359                 case SSL3_ST_CR_KEY_EXCH_B:
 360                         ret=ssl3_get_key_exchange(s);
 361                         if (ret <= 0) goto end;
 362                         s->state=SSL3_ST_CR_CERT_REQ_A;
 363                         s->init_num=0;
 364
 365                         /* at this point we check that we have the
 366                          * required stuff from the server */
 367                         if (!ssl3_check_cert_and_algorithm(s))
 368                                 {
 369                                 ret= -1;
 370                                 goto end;
 371                                 }
 372                         break;
 373
 374                 case SSL3_ST_CR_CERT_REQ_A:
 375                 case SSL3_ST_CR_CERT_REQ_B:
 376                         ret=ssl3_get_certificate_request(s);
 377                         if (ret <= 0) goto end;
 378                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 379                         s->init_num=0;
 380                         break;
 381
 382                 case SSL3_ST_CR_SRVR_DONE_A:
 383                 case SSL3_ST_CR_SRVR_DONE_B:
 384                         ret=ssl3_get_server_done(s);
 385                         if (ret <= 0) goto end;
 386 #ifndef OPENSSL_NO_SRP
 387                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
 388                                 {
 389                                 if ((ret = SRP_Calc_A_param(s))<=0)
 390                                         {
 391                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
 392                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
 393                                         goto end;
 394                                         }
 395                                 }
 396 #endif
 397                         if (s->s3->tmp.cert_req)
 398                                 s->state=SSL3_ST_CW_CERT_A;
 399                         else
 400                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 401                         s->init_num=0;
 402
 403                         break;
 404
 405                 case SSL3_ST_CW_CERT_A:
 406                 case SSL3_ST_CW_CERT_B:
 407                 case SSL3_ST_CW_CERT_C:
 408                 case SSL3_ST_CW_CERT_D:
 409                         ret=ssl3_send_client_certificate(s);
 410                         if (ret <= 0) goto end;
 411                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 412                         s->init_num=0;
 413                         break;
 414
 415                 case SSL3_ST_CW_KEY_EXCH_A:
 416                 case SSL3_ST_CW_KEY_EXCH_B:
 417                         ret=ssl3_send_client_key_exchange(s);
 418                         if (ret <= 0) goto end;
 419                         /* EAY EAY EAY need to check for DH fix cert
 420                          * sent back */
 421                         /* For TLS, cert_req is set to 2, so a cert chain
 422                          * of nothing is sent, but no verify packet is sent */
 423                         /* XXX: For now, we do not support client
 424                          * authentication in ECDH cipher suites with
 425                          * ECDH (rather than ECDSA) certificates.
 426                          * We need to skip the certificate verify
 427                          * message when client's ECDH public key is sent
 428                          * inside the client certificate.
 429                          */
 430                         if (s->s3->tmp.cert_req == 1)
 431                                 {
 432                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 433                                 }
 434                         else
 435                                 {
 436                                 s->state=SSL3_ST_CW_CHANGE_A;
 437                                 s->s3->change_cipher_spec=0;
 438                                 }
 439                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 440                                 {
 441                                 s->state=SSL3_ST_CW_CHANGE_A;
 442                                 s->s3->change_cipher_spec=0;
 443                                 }
 444
 445                         s->init_num=0;
 446                         break;
 447
 448                 case SSL3_ST_CW_CERT_VRFY_A:
 449                 case SSL3_ST_CW_CERT_VRFY_B:
 450                         ret=ssl3_send_client_verify(s);
 451                         if (ret <= 0) goto end;
 452                         s->state=SSL3_ST_CW_CHANGE_A;
 453                         s->init_num=0;
 454                         s->s3->change_cipher_spec=0;
 455                         break;
 456
 457                 case SSL3_ST_CW_CHANGE_A:
 458                 case SSL3_ST_CW_CHANGE_B:
 459                         ret=ssl3_send_change_cipher_spec(s,
 460                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 461                         if (ret <= 0) goto end;
 462
 463 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 464                         s->state=SSL3_ST_CW_FINISHED_A;
 465 #else
 466                         if (s->s3->next_proto_neg_seen)
 467                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
 468                         else
 469                                 s->state=SSL3_ST_CW_FINISHED_A;
 470 #endif
 471                         s->init_num=0;
 472
 473                         s->session->cipher=s->s3->tmp.new_cipher;
 474 #ifdef OPENSSL_NO_COMP
 475                         s->session->compress_meth=0;
 476 #else
 477                         if (s->s3->tmp.new_compression == NULL)
 478                                 s->session->compress_meth=0;
 479                         else
 480                                 s->session->compress_meth=
 481                                         s->s3->tmp.new_compression->id;
 482 #endif
 483                         if (!s->method->ssl3_enc->setup_key_block(s))
 484                                 {
 485                                 ret= -1;
 486                                 goto end;
 487                                 }
 488
 489                         if (!s->method->ssl3_enc->change_cipher_state(s,
 490                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 491                                 {
 492                                 ret= -1;
 493                                 goto end;
 494                                 }
 495
 496                         break;
 497
 498 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 499                 case SSL3_ST_CW_NEXT_PROTO_A:
 500                 case SSL3_ST_CW_NEXT_PROTO_B:
 501                         ret=ssl3_send_next_proto(s);
 502                         if (ret <= 0) goto end;
 503                         s->state=SSL3_ST_CW_FINISHED_A;
 504                         break;
 505 #endif
 506
 507                 case SSL3_ST_CW_FINISHED_A:
 508                 case SSL3_ST_CW_FINISHED_B:
 509                         ret=ssl3_send_finished(s,
 510                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 511                                 s->method->ssl3_enc->client_finished_label,
 512                                 s->method->ssl3_enc->client_finished_label_len);
 513                         if (ret <= 0) goto end;
 514                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 515                         s->state=SSL3_ST_CW_FLUSH;
 516
 517                         /* clear flags */
 518                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 519                         if (s->hit)
 520                                 {
 521                                 s->s3->tmp.next_state=SSL_ST_OK;
 522                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 523                                         {
 524                                         s->state=SSL_ST_OK;
 525                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 526                                         s->s3->delay_buf_pop_ret=0;
 527                                         }
 528                                 }
 529                         else
 530                                 {
 531 #ifndef OPENSSL_NO_TLSEXT
 532                                 /* Allow NewSessionTicket if ticket expected */
 533                                 if (s->tlsext_ticket_expected)
 534                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 535                                 else
 536 #endif
 537
 538                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 539                                 }
 540                         s->init_num=0;
 541                         break;
 542
 543 #ifndef OPENSSL_NO_TLSEXT
 544                 case SSL3_ST_CR_SESSION_TICKET_A:
 545                 case SSL3_ST_CR_SESSION_TICKET_B:
 546                         ret=ssl3_get_new_session_ticket(s);
 547                         if (ret <= 0) goto end;
 548                         s->state=SSL3_ST_CR_FINISHED_A;
 549                         s->init_num=0;
 550                 break;
 551
 552                 case SSL3_ST_CR_CERT_STATUS_A:
 553                 case SSL3_ST_CR_CERT_STATUS_B:
 554                         ret=ssl3_get_cert_status(s);
 555                         if (ret <= 0) goto end;
 556                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 557                         s->init_num=0;
 558                 break;
 559 #endif
 560
 561                 case SSL3_ST_CR_FINISHED_A:
 562                 case SSL3_ST_CR_FINISHED_B:
 563
 564                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 565                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 566                                 SSL3_ST_CR_FINISHED_B);
 567                         if (ret <= 0) goto end;
 568
 569                         if (s->hit)
 570                                 s->state=SSL3_ST_CW_CHANGE_A;
 571                         else
 572                                 s->state=SSL_ST_OK;
 573                         s->init_num=0;
 574                         break;
 575
 576                 case SSL3_ST_CW_FLUSH:
 577                         s->rwstate=SSL_WRITING;
 578                         if (BIO_flush(s->wbio) <= 0)
 579                                 {
 580                                 ret= -1;
 581                                 goto end;
 582                                 }
 583                         s->rwstate=SSL_NOTHING;
 584                         s->state=s->s3->tmp.next_state;
 585                         break;
 586
 587                 case SSL_ST_OK:
 588                         /* clean a few things up */
 589                         ssl3_cleanup_key_block(s);
 590
 591                         if (s->init_buf != NULL)
 592                                 {
 593                                 BUF_MEM_free(s->init_buf);
 594                                 s->init_buf=NULL;
 595                                 }
 596
 597                         /* If we are not 'joining' the last two packets,
 598                          * remove the buffering now */
 599                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 600                                 ssl_free_wbio_buffer(s);
 601                         /* else do it later in ssl3_write */
 602
 603                         s->init_num=0;
 604                         s->renegotiate=0;
 605                         s->new_session=0;
 606
 607                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 608                         if (s->hit) s->ctx->stats.sess_hit++;
 609
 610                         ret=1;
 611                         /* s->server=0; */
 612                         s->handshake_func=ssl3_connect;
 613                         s->ctx->stats.sess_connect_good++;
 614
 615                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 616
 617                         goto end;
 618                         /* break; */
 619
 620                 default:
 621                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 622                         ret= -1;
 623                         goto end;
 624                         /* break; */
 625                         }
 626
 627                 /* did we do anything */
 628                 if (!s->s3->tmp.reuse_message && !skip)
 629                         {
 630                         if (s->debug)
 631                                 {
 632                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 633                                         goto end;
 634                                 }
 635
 636                         if ((cb != NULL) && (s->state != state))
 637                                 {
 638                                 new_state=s->state;
 639                                 s->state=state;
 640                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 641                                 s->state=new_state;
 642                                 }
 643                         }
 644                 skip=0;
 645                 }
 646 end:
 647         s->in_handshake--;
 648         if (buf != NULL)
 649                 BUF_MEM_free(buf);
 650         if (cb != NULL)
 651                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 652         return(ret);
 653         }
 654
 655
 656 int ssl3_client_hello(SSL *s)
 657         {
 658         unsigned char *buf;
 659         unsigned char *p,*d;
 660         int i;
 661         unsigned long l;
 662         int al = 0;
 663 #ifndef OPENSSL_NO_COMP
 664         int j;
 665         SSL_COMP *comp;
 666 #endif
 667
 668         buf=(unsigned char *)s->init_buf->data;
 669         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 670                 {
 671                 SSL_SESSION *sess = s->session;
 672                 if ((sess == NULL) ||
 673                         (sess->ssl_version != s->version) ||
 674 #ifdef OPENSSL_NO_TLSEXT
 675                         !sess->session_id_length ||
 676 #else
 677                         (!sess->session_id_length && !sess->tlsext_tick) ||
 678 #endif
 679                         (sess->not_resumable))
 680                         {
 681                         if (!ssl_get_new_session(s,0))
 682                                 goto err;
 683                         }
 684                 if (s->method->version == DTLS_ANY_VERSION)
 685                         {
 686                         /* Determine which DTLS version to use */
 687                         int options = s->options;
 688                         /* If DTLS 1.2 disabled correct the version number */
 689                         if (options & SSL_OP_NO_DTLSv1_2)
 690                                 {
 691                                 if (tls1_suiteb(s))
 692                                         {
 693                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
 694                                         goto err;
 695                                         }
 696                                 /* Disabling all versions is silly: return an
 697                                  * error.
 698                                  */
 699                                 if (options & SSL_OP_NO_DTLSv1)
 700                                         {
 701                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_WRONG_SSL_VERSION);
 702                                         goto err;
 703                                         }
 704                                 /* Update method so we don't use any DTLS 1.2
 705                                  * features.
 706                                  */
 707                                 s->method = DTLSv1_client_method();
 708                                 s->version = DTLS1_VERSION;
 709                                 }
 710                         else
 711                                 {
 712                                 /* We only support one version: update method */
 713                                 if (options & SSL_OP_NO_DTLSv1)
 714                                         s->method = DTLSv1_2_client_method();
 715                                 s->version = DTLS1_2_VERSION;
 716                                 }
 717                         s->client_version = s->version;
 718                         }
 719                 /* else use the pre-loaded session */
 720
 721                 p=s->s3->client_random;
 722
 723                 /* for DTLS if client_random is initialized, reuse it, we are
 724                  * required to use same upon reply to HelloVerify */
 725                 if (SSL_IS_DTLS(s))
 726                         {
 727                         size_t idx;
 728                         i = 1;
 729                         for (idx=0; idx < sizeof(s->s3->client_random); idx++)
 730                                 {
 731                                 if (p[idx])
 732                                         {
 733                                         i = 0;
 734                                         break;
 735                                         }
 736                                 }
 737                         }
 738                 else
 739                         i = 1;
 740
 741                 if (i)
 742                         ssl_fill_hello_random(s, 0, p,
 743                                               sizeof(s->s3->client_random));
 744
 745                 /* Do the message type and length last */
 746                 d=p= ssl_handshake_start(s);
 747
 748                 /* version indicates the negotiated version: for example from
 749                  * an SSLv2/v3 compatible client hello). The client_version
 750                  * field is the maximum version we permit and it is also
 751                  * used in RSA encrypted premaster secrets. Some servers can
 752                  * choke if we initially report a higher version then
 753                  * renegotiate to a lower one in the premaster secret. This
 754                  * didn't happen with TLS 1.0 as most servers supported it
 755                  * but it can with TLS 1.1 or later if the server only supports
 756                  * 1.0.
 757                  *
 758                  * Possible scenario with previous logic:
 759                  *      1. Client hello indicates TLS 1.2
 760                  *      2. Server hello says TLS 1.0
 761                  *      3. RSA encrypted premaster secret uses 1.2.
 762                  *      4. Handhaked proceeds using TLS 1.0.
 763                  *      5. Server sends hello request to renegotiate.
 764                  *      6. Client hello indicates TLS v1.0 as we now
 765                  *         know that is maximum server supports.
 766                  *      7. Server chokes on RSA encrypted premaster secret
 767                  *         containing version 1.0.
 768                  *
 769                  * For interoperability it should be OK to always use the
 770                  * maximum version we support in client hello and then rely
 771                  * on the checking of version to ensure the servers isn't
 772                  * being inconsistent: for example initially negotiating with
 773                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
 774                  * client_version in client hello and not resetting it to
 775                  * the negotiated version.
 776                  */
 777 #if 0
 778                 *(p++)=s->version>>8;
 779                 *(p++)=s->version&0xff;
 780                 s->client_version=s->version;
 781 #else
 782                 *(p++)=s->client_version>>8;
 783                 *(p++)=s->client_version&0xff;
 784 #endif
 785
 786                 /* Random stuff */
 787                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 788                 p+=SSL3_RANDOM_SIZE;
 789
 790                 /* Session ID */
 791                 if (s->new_session)
 792                         i=0;
 793                 else
 794                         i=s->session->session_id_length;
 795                 *(p++)=i;
 796                 if (i != 0)
 797                         {
 798                         if (i > (int)sizeof(s->session->session_id))
 799                                 {
 800                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 801                                 goto err;
 802                                 }
 803                         memcpy(p,s->session->session_id,i);
 804                         p+=i;
 805                         }
 806
 807                 /* cookie stuff for DTLS */
 808                 if (SSL_IS_DTLS(s))
 809                         {
 810                         if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 811                                 {
 812                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 813                                 goto err;
 814                                 }
 815                         *(p++) = s->d1->cookie_len;
 816                         memcpy(p, s->d1->cookie, s->d1->cookie_len);
 817                         p += s->d1->cookie_len;
 818                         }
 819
 820                 /* Ciphers supported */
 821                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 822                 if (i == 0)
 823                         {
 824                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 825                         goto err;
 826                         }
 827 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
 828                         /* Some servers hang if client hello > 256 bytes
 829                          * as hack workaround chop number of supported ciphers
 830                          * to keep it well below this if we use TLS v1.2
 831                          */
 832                         if (TLS1_get_version(s) >= TLS1_2_VERSION
 833                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
 834                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
 835 #endif
 836                 s2n(i,p);
 837                 p+=i;
 838
 839                 /* COMPRESSION */
 840 #ifdef OPENSSL_NO_COMP
 841                 *(p++)=1;
 842 #else
 843
 844                 if ((s->options & SSL_OP_NO_COMPRESSION)
 845                                         || !s->ctx->comp_methods)
 846                         j=0;
 847                 else
 848                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 849                 *(p++)=1+j;
 850                 for (i=0; i<j; i++)
 851                         {
 852                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 853                         *(p++)=comp->id;
 854                         }
 855 #endif
 856                 *(p++)=0; /* Add the NULL method */
 857
 858 #ifndef OPENSSL_NO_TLSEXT
 859                 /* TLS extensions*/
 860                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 861                         {
 862                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 863                         goto err;
 864                         }
 865                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL)
 866                         {
 867                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 868                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 869                         goto err;
 870                         }
 871 #endif
 872
 873                 l= p-d;
 874                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l);
 875                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 876                 }
 877
 878         /* SSL3_ST_CW_CLNT_HELLO_B */
 879         return ssl_do_write(s);
 880 err:
 881         return(-1);
 882         }
 883
 884 int ssl3_get_server_hello(SSL *s)
 885         {
 886         STACK_OF(SSL_CIPHER) *sk;
 887         const SSL_CIPHER *c;
 888         CERT *ct = s->cert;
 889         unsigned char *p,*d;
 890         int i,al=SSL_AD_INTERNAL_ERROR,ok;
 891         unsigned int j;
 892         long n;
 893 #ifndef OPENSSL_NO_COMP
 894         SSL_COMP *comp;
 895 #endif
 896         /* Hello verify request and/or server hello version may not
 897          * match so set first packet if we're negotiating version.
 898          */
 899         if (SSL_IS_DTLS(s))
 900                 s->first_packet = 1;
 901
 902         n=s->method->ssl_get_message(s,
 903                 SSL3_ST_CR_SRVR_HELLO_A,
 904                 SSL3_ST_CR_SRVR_HELLO_B,
 905                 -1,
 906                 20000, /* ?? */
 907                 &ok);
 908
 909         if (!ok) return((int)n);
 910
 911         if (SSL_IS_DTLS(s))
 912                 {
 913                 s->first_packet = 0;
 914                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 915                         {
 916                         if ( s->d1->send_cookie == 0)
 917                                 {
 918                                 s->s3->tmp.reuse_message = 1;
 919                                 return 1;
 920                                 }
 921                         else /* already sent a cookie */
 922                                 {
 923                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 924                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 925                                 goto f_err;
 926                                 }
 927                         }
 928                 }
 929
 930         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 931                 {
 932                 al=SSL_AD_UNEXPECTED_MESSAGE;
 933                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 934                 goto f_err;
 935                 }
 936
 937         d=p=(unsigned char *)s->init_msg;
 938         if (s->method->version == DTLS_ANY_VERSION)
 939                 {
 940                 /* Work out correct protocol version to use */
 941                 int hversion = (p[0] << 8)|p[1];
 942                 int options = s->options;
 943                 if (hversion == DTLS1_2_VERSION
 944                         && !(options & SSL_OP_NO_DTLSv1_2))
 945                         s->method = DTLSv1_2_client_method();
 946                 else if (tls1_suiteb(s))
 947                         {
 948                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
 949                         s->version = hversion;
 950                         al = SSL_AD_PROTOCOL_VERSION;
 951                         goto f_err;
 952                         }
 953                 else if (hversion == DTLS1_VERSION
 954                         && !(options & SSL_OP_NO_DTLSv1))
 955                         s->method = DTLSv1_client_method();
 956                 else
 957                         {
 958                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 959                         s->version = hversion;
 960                         al = SSL_AD_PROTOCOL_VERSION;
 961                         goto f_err;
 962                         }
 963                 s->version = s->client_version = s->method->version;
 964                 }
 965
 966         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 967                 {
 968                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 969                 s->version=(s->version&0xff00)|p[1];
 970                 al=SSL_AD_PROTOCOL_VERSION;
 971                 goto f_err;
 972                 }
 973         p+=2;
 974
 975         /* load the server hello data */
 976         /* load the server random */
 977         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 978         p+=SSL3_RANDOM_SIZE;
 979
 980         /* get the session-id */
 981         j= *(p++);
 982
 983         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 984                 {
 985                 al=SSL_AD_ILLEGAL_PARAMETER;
 986                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 987                 goto f_err;
 988                 }
 989
 990 #ifndef OPENSSL_NO_TLSEXT
 991         /* check if we want to resume the session based on external pre-shared secret */
 992         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 993                 {
 994                 SSL_CIPHER *pref_cipher=NULL;
 995                 s->session->master_key_length=sizeof(s->session->master_key);
 996                 if (s->tls_session_secret_cb(s, s->session->master_key,
 997                                              &s->session->master_key_length,
 998                                              NULL, &pref_cipher,
 999                                              s->tls_session_secret_cb_arg))
1000                         {
1001                         s->session->cipher = pref_cipher ?
1002                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
1003                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
1004                         }
1005                 }
1006 #endif /* OPENSSL_NO_TLSEXT */
1007
1008         if (j != 0 && j == s->session->session_id_length
1009             && memcmp(p,s->session->session_id,j) == 0)
1010             {
1011             if(s->sid_ctx_length != s->session->sid_ctx_length
1012                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
1013                 {
1014                 /* actually a client application bug */
1015                 al=SSL_AD_ILLEGAL_PARAMETER;
1016                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
1017                 goto f_err;
1018                 }
1019             s->s3->flags |= SSL3_FLAGS_CCS_OK;
1020             s->hit=1;
1021             }
1022         else    /* a miss or crap from the other end */
1023                 {
1024                 /* If we were trying for session-id reuse, make a new
1025                  * SSL_SESSION so we don't stuff up other people */
1026                 s->hit=0;
1027                 if (s->session->session_id_length > 0)
1028                         {
1029                         if (!ssl_get_new_session(s,0))
1030                                 {
1031                                 goto f_err;
1032                                 }
1033                         }
1034                 s->session->session_id_length=j;
1035                 memcpy(s->session->session_id,p,j); /* j could be 0 */
1036                 }
1037         p+=j;
1038         c=ssl_get_cipher_by_char(s,p);
1039         if (c == NULL)
1040                 {
1041                 /* unknown cipher */
1042                 al=SSL_AD_ILLEGAL_PARAMETER;
1043                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
1044                 goto f_err;
1045                 }
1046         /* If it is a disabled cipher we didn't send it in client hello,
1047          * so return an error.
1048          */
1049         if (c->algorithm_ssl & ct->mask_ssl ||
1050                 c->algorithm_mkey & ct->mask_k ||
1051                 c->algorithm_auth & ct->mask_a)
1052                 {
1053                 al=SSL_AD_ILLEGAL_PARAMETER;
1054                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1055                 goto f_err;
1056                 }
1057         p+=ssl_put_cipher_by_char(s,NULL,NULL);
1058
1059         sk=ssl_get_ciphers_by_id(s);
1060         i=sk_SSL_CIPHER_find(sk,c);
1061         if (i < 0)
1062                 {
1063                 /* we did not say we would use this cipher */
1064                 al=SSL_AD_ILLEGAL_PARAMETER;
1065                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1066                 goto f_err;
1067                 }
1068
1069         /* Depending on the session caching (internal/external), the cipher
1070            and/or cipher_id values may not be set. Make sure that
1071            cipher_id is set and use it for comparison. */
1072         if (s->session->cipher)
1073                 s->session->cipher_id = s->session->cipher->id;
1074         if (s->hit && (s->session->cipher_id != c->id))
1075                 {
1076 /* Workaround is now obsolete */
1077 #if 0
1078                 if (!(s->options &
1079                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
1080 #endif
1081                         {
1082                         al=SSL_AD_ILLEGAL_PARAMETER;
1083                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1084                         goto f_err;
1085                         }
1086                 }
1087         s->s3->tmp.new_cipher=c;
1088         /* Don't digest cached records if no sigalgs: we may need them for
1089          * client authentication.
1090          */
1091         if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s))
1092                 goto f_err;
1093         /* lets get the compression algorithm */
1094         /* COMPRESSION */
1095 #ifdef OPENSSL_NO_COMP
1096         if (*(p++) != 0)
1097                 {
1098                 al=SSL_AD_ILLEGAL_PARAMETER;
1099                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1100                 goto f_err;
1101                 }
1102         /* If compression is disabled we'd better not try to resume a session
1103          * using compression.
1104          */
1105         if (s->session->compress_meth != 0)
1106                 {
1107                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1108                 goto f_err;
1109                 }
1110 #else
1111         j= *(p++);
1112         if (s->hit && j != s->session->compress_meth)
1113                 {
1114                 al=SSL_AD_ILLEGAL_PARAMETER;
1115                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1116                 goto f_err;
1117                 }
1118         if (j == 0)
1119                 comp=NULL;
1120         else if (s->options & SSL_OP_NO_COMPRESSION)
1121                 {
1122                 al=SSL_AD_ILLEGAL_PARAMETER;
1123                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1124                 goto f_err;
1125                 }
1126         else
1127                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1128
1129         if ((j != 0) && (comp == NULL))
1130                 {
1131                 al=SSL_AD_ILLEGAL_PARAMETER;
1132                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1133                 goto f_err;
1134                 }
1135         else
1136                 {
1137                 s->s3->tmp.new_compression=comp;
1138                 }
1139 #endif
1140
1141 #ifndef OPENSSL_NO_TLSEXT
1142         /* TLS extensions*/
1143         if (!ssl_parse_serverhello_tlsext(s,&p,d,n))
1144                 {
1145                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1146                 goto err;
1147                 }
1148 #endif
1149
1150         if (p != (d+n))
1151                 {
1152                 /* wrong packet length */
1153                 al=SSL_AD_DECODE_ERROR;
1154                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1155                 goto f_err;
1156                 }
1157
1158         return(1);
1159 f_err:
1160         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1161 err:
1162         return(-1);
1163         }
1164
1165 int ssl3_get_server_certificate(SSL *s)
1166         {
1167         int al,i,ok,ret= -1;
1168         unsigned long n,nc,llen,l;
1169         X509 *x=NULL;
1170         const unsigned char *q,*p;
1171         unsigned char *d;
1172         STACK_OF(X509) *sk=NULL;
1173         SESS_CERT *sc;
1174         EVP_PKEY *pkey=NULL;
1175         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1176
1177         n=s->method->ssl_get_message(s,
1178                 SSL3_ST_CR_CERT_A,
1179                 SSL3_ST_CR_CERT_B,
1180                 -1,
1181                 s->max_cert_list,
1182                 &ok);
1183
1184         if (!ok) return((int)n);
1185
1186         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1187                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1188                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1189                 {
1190                 s->s3->tmp.reuse_message=1;
1191                 return(1);
1192                 }
1193
1194         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1195                 {
1196                 al=SSL_AD_UNEXPECTED_MESSAGE;
1197                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1198                 goto f_err;
1199                 }
1200         p=d=(unsigned char *)s->init_msg;
1201
1202         if ((sk=sk_X509_new_null()) == NULL)
1203                 {
1204                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1205                 goto err;
1206                 }
1207
1208         n2l3(p,llen);
1209         if (llen+3 != n)
1210                 {
1211                 al=SSL_AD_DECODE_ERROR;
1212                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1213                 goto f_err;
1214                 }
1215         for (nc=0; nc<llen; )
1216                 {
1217                 n2l3(p,l);
1218                 if ((l+nc+3) > llen)
1219                         {
1220                         al=SSL_AD_DECODE_ERROR;
1221                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1222                         goto f_err;
1223                         }
1224
1225                 q=p;
1226                 x=d2i_X509(NULL,&q,l);
1227                 if (x == NULL)
1228                         {
1229                         al=SSL_AD_BAD_CERTIFICATE;
1230                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1231                         goto f_err;
1232                         }
1233                 if (q != (p+l))
1234                         {
1235                         al=SSL_AD_DECODE_ERROR;
1236                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1237                         goto f_err;
1238                         }
1239                 if (!sk_X509_push(sk,x))
1240                         {
1241                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1242                         goto err;
1243                         }
1244                 x=NULL;
1245                 nc+=l+3;
1246                 p=q;
1247                 }
1248
1249         i=ssl_verify_cert_chain(s,sk);
1250         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1251 #ifndef OPENSSL_NO_KRB5
1252             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1253                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1254 #endif /* OPENSSL_NO_KRB5 */
1255                 )
1256                 {
1257                 al=ssl_verify_alarm_type(s->verify_result);
1258                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1259                 goto f_err;
1260                 }
1261         ERR_clear_error(); /* but we keep s->verify_result */
1262
1263         sc=ssl_sess_cert_new();
1264         if (sc == NULL) goto err;
1265
1266         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1267         s->session->sess_cert=sc;
1268
1269         sc->cert_chain=sk;
1270         /* Inconsistency alert: cert_chain does include the peer's
1271          * certificate, which we don't include in s3_srvr.c */
1272         x=sk_X509_value(sk,0);
1273         sk=NULL;
1274         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1275
1276         pkey=X509_get_pubkey(x);
1277
1278         /* VRS: allow null cert if auth == KRB5 */
1279         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1280                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1281                     ? 0 : 1;
1282
1283 #ifdef KSSL_DEBUG
1284         printf("pkey,x = %p, %p\n", pkey,x);
1285         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1286         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1287                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1288 #endif    /* KSSL_DEBUG */
1289
1290         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1291                 {
1292                 x=NULL;
1293                 al=SSL3_AL_FATAL;
1294                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1295                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1296                 goto f_err;
1297                 }
1298
1299         i=ssl_cert_type(x,pkey);
1300         if (need_cert && i < 0)
1301                 {
1302                 x=NULL;
1303                 al=SSL3_AL_FATAL;
1304                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1305                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1306                 goto f_err;
1307                 }
1308
1309         if (need_cert)
1310                 {
1311                 int exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
1312                 if (exp_idx >= 0 && i != exp_idx)
1313                         {
1314                         x=NULL;
1315                         al=SSL_AD_ILLEGAL_PARAMETER;
1316                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1317                                 SSL_R_WRONG_CERTIFICATE_TYPE);
1318                         goto f_err;
1319                         }
1320                 sc->peer_cert_type=i;
1321                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1322                 /* Why would the following ever happen?
1323                  * We just created sc a couple of lines ago. */
1324                 if (sc->peer_pkeys[i].x509 != NULL)
1325                         X509_free(sc->peer_pkeys[i].x509);
1326                 sc->peer_pkeys[i].x509=x;
1327                 sc->peer_key= &(sc->peer_pkeys[i]);
1328
1329                 if (s->session->peer != NULL)
1330                         X509_free(s->session->peer);
1331                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1332                 s->session->peer=x;
1333                 }
1334         else
1335                 {
1336                 sc->peer_cert_type=i;
1337                 sc->peer_key= NULL;
1338
1339                 if (s->session->peer != NULL)
1340                         X509_free(s->session->peer);
1341                 s->session->peer=NULL;
1342                 }
1343         s->session->verify_result = s->verify_result;
1344
1345         x=NULL;
1346         ret=1;
1347         if (0)
1348                 {
1349 f_err:
1350                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1351                 }
1352 err:
1353         EVP_PKEY_free(pkey);
1354         X509_free(x);
1355         sk_X509_pop_free(sk,X509_free);
1356         return(ret);
1357         }
1358
1359 int ssl3_get_key_exchange(SSL *s)
1360         {
1361 #ifndef OPENSSL_NO_RSA
1362         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1363 #endif
1364         EVP_MD_CTX md_ctx;
1365         unsigned char *param,*p;
1366         int al,i,j,param_len,ok;
1367         long n,alg_k,alg_a;
1368         EVP_PKEY *pkey=NULL;
1369         const EVP_MD *md = NULL;
1370 #ifndef OPENSSL_NO_RSA
1371         RSA *rsa=NULL;
1372 #endif
1373 #ifndef OPENSSL_NO_DH
1374         DH *dh=NULL;
1375 #endif
1376 #ifndef OPENSSL_NO_ECDH
1377         EC_KEY *ecdh = NULL;
1378         BN_CTX *bn_ctx = NULL;
1379         EC_POINT *srvr_ecpoint = NULL;
1380         int curve_nid = 0;
1381         int encoded_pt_len = 0;
1382 #endif
1383
1384         /* use same message size as in ssl3_get_certificate_request()
1385          * as ServerKeyExchange message may be skipped */
1386         n=s->method->ssl_get_message(s,
1387                 SSL3_ST_CR_KEY_EXCH_A,
1388                 SSL3_ST_CR_KEY_EXCH_B,
1389                 -1,
1390                 s->max_cert_list,
1391                 &ok);
1392         if (!ok) return((int)n);
1393
1394         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1395                 {
1396 #ifndef OPENSSL_NO_PSK
1397                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1398                    omitted if no identity hint is sent. Set
1399                    session->sess_cert anyway to avoid problems
1400                    later.*/
1401                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1402                         {
1403                         s->session->sess_cert=ssl_sess_cert_new();
1404                         if (s->ctx->psk_identity_hint)
1405                                 OPENSSL_free(s->ctx->psk_identity_hint);
1406                         s->ctx->psk_identity_hint = NULL;
1407                         }
1408 #endif
1409                 s->s3->tmp.reuse_message=1;
1410                 return(1);
1411                 }
1412
1413         param=p=(unsigned char *)s->init_msg;
1414         if (s->session->sess_cert != NULL)
1415                 {
1416 #ifndef OPENSSL_NO_RSA
1417                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1418                         {
1419                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1420                         s->session->sess_cert->peer_rsa_tmp=NULL;
1421                         }
1422 #endif
1423 #ifndef OPENSSL_NO_DH
1424                 if (s->session->sess_cert->peer_dh_tmp)
1425                         {
1426                         DH_free(s->session->sess_cert->peer_dh_tmp);
1427                         s->session->sess_cert->peer_dh_tmp=NULL;
1428                         }
1429 #endif
1430 #ifndef OPENSSL_NO_ECDH
1431                 if (s->session->sess_cert->peer_ecdh_tmp)
1432                         {
1433                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1434                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1435                         }
1436 #endif
1437                 }
1438         else
1439                 {
1440                 s->session->sess_cert=ssl_sess_cert_new();
1441                 }
1442
1443         param_len=0;
1444         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1445         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1446         EVP_MD_CTX_init(&md_ctx);
1447
1448 #ifndef OPENSSL_NO_PSK
1449         if (alg_k & SSL_kPSK)
1450                 {
1451                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1452
1453                 al=SSL_AD_HANDSHAKE_FAILURE;
1454                 n2s(p,i);
1455                 param_len=i+2;
1456                 /* Store PSK identity hint for later use, hint is used
1457                  * in ssl3_send_client_key_exchange.  Assume that the
1458                  * maximum length of a PSK identity hint can be as
1459                  * long as the maximum length of a PSK identity. */
1460                 if (i > PSK_MAX_IDENTITY_LEN)
1461                         {
1462                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1463                                 SSL_R_DATA_LENGTH_TOO_LONG);
1464                         goto f_err;
1465                         }
1466                 if (param_len > n)
1467                         {
1468                         al=SSL_AD_DECODE_ERROR;
1469                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1470                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1471                         goto f_err;
1472                         }
1473                 /* If received PSK identity hint contains NULL
1474                  * characters, the hint is truncated from the first
1475                  * NULL. p may not be ending with NULL, so create a
1476                  * NULL-terminated string. */
1477                 memcpy(tmp_id_hint, p, i);
1478                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1479                 if (s->ctx->psk_identity_hint != NULL)
1480                         OPENSSL_free(s->ctx->psk_identity_hint);
1481                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1482                 if (s->ctx->psk_identity_hint == NULL)
1483                         {
1484                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1485                         goto f_err;
1486                         }
1487
1488                 p+=i;
1489                 n-=param_len;
1490                 }
1491         else
1492 #endif /* !OPENSSL_NO_PSK */
1493 #ifndef OPENSSL_NO_SRP
1494         if (alg_k & SSL_kSRP)
1495                 {
1496                 n2s(p,i);
1497                 param_len=i+2;
1498                 if (param_len > n)
1499                         {
1500                         al=SSL_AD_DECODE_ERROR;
1501                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1502                         goto f_err;
1503                         }
1504                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1505                         {
1506                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1507                         goto err;
1508                         }
1509                 p+=i;
1510
1511                 n2s(p,i);
1512                 param_len+=i+2;
1513                 if (param_len > n)
1514                         {
1515                         al=SSL_AD_DECODE_ERROR;
1516                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1517                         goto f_err;
1518                         }
1519                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1520                         {
1521                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1522                         goto err;
1523                         }
1524                 p+=i;
1525
1526                 i = (unsigned int)(p[0]);
1527                 p++;
1528                 param_len+=i+1;
1529                 if (param_len > n)
1530                         {
1531                         al=SSL_AD_DECODE_ERROR;
1532                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1533                         goto f_err;
1534                         }
1535                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1536                         {
1537                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1538                         goto err;
1539                         }
1540                 p+=i;
1541
1542                 n2s(p,i);
1543                 param_len+=i+2;
1544                 if (param_len > n)
1545                         {
1546                         al=SSL_AD_DECODE_ERROR;
1547                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1548                         goto f_err;
1549                         }
1550                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1551                         {
1552                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1553                         goto err;
1554                         }
1555                 p+=i;
1556                 n-=param_len;
1557
1558                 if (!srp_verify_server_param(s, &al))
1559                         {
1560                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
1561                         goto f_err;
1562                         }
1563
1564 /* We must check if there is a certificate */
1565 #ifndef OPENSSL_NO_RSA
1566                 if (alg_a & SSL_aRSA)
1567                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1568 #else
1569                 if (0)
1570                         ;
1571 #endif
1572 #ifndef OPENSSL_NO_DSA
1573                 else if (alg_a & SSL_aDSS)
1574                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1575 #endif
1576                 }
1577         else
1578 #endif /* !OPENSSL_NO_SRP */
1579 #ifndef OPENSSL_NO_RSA
1580         if (alg_k & SSL_kRSA)
1581                 {
1582                 if ((rsa=RSA_new()) == NULL)
1583                         {
1584                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1585                         goto err;
1586                         }
1587                 n2s(p,i);
1588                 param_len=i+2;
1589                 if (param_len > n)
1590                         {
1591                         al=SSL_AD_DECODE_ERROR;
1592                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1593                         goto f_err;
1594                         }
1595                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1596                         {
1597                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1598                         goto err;
1599                         }
1600                 p+=i;
1601
1602                 n2s(p,i);
1603                 param_len+=i+2;
1604                 if (param_len > n)
1605                         {
1606                         al=SSL_AD_DECODE_ERROR;
1607                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1608                         goto f_err;
1609                         }
1610                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1611                         {
1612                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1613                         goto err;
1614                         }
1615                 p+=i;
1616                 n-=param_len;
1617
1618                 /* this should be because we are using an export cipher */
1619                 if (alg_a & SSL_aRSA)
1620                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1621                 else
1622                         {
1623                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1624                         goto err;
1625                         }
1626                 s->session->sess_cert->peer_rsa_tmp=rsa;
1627                 rsa=NULL;
1628                 }
1629 #else /* OPENSSL_NO_RSA */
1630         if (0)
1631                 ;
1632 #endif
1633 #ifndef OPENSSL_NO_DH
1634         else if (alg_k & SSL_kEDH)
1635                 {
1636                 if ((dh=DH_new()) == NULL)
1637                         {
1638                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1639                         goto err;
1640                         }
1641                 n2s(p,i);
1642                 param_len=i+2;
1643                 if (param_len > n)
1644                         {
1645                         al=SSL_AD_DECODE_ERROR;
1646                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1647                         goto f_err;
1648                         }
1649                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1650                         {
1651                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1652                         goto err;
1653                         }
1654                 p+=i;
1655
1656                 n2s(p,i);
1657                 param_len+=i+2;
1658                 if (param_len > n)
1659                         {
1660                         al=SSL_AD_DECODE_ERROR;
1661                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1662                         goto f_err;
1663                         }
1664                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1665                         {
1666                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1667                         goto err;
1668                         }
1669                 p+=i;
1670
1671                 n2s(p,i);
1672                 param_len+=i+2;
1673                 if (param_len > n)
1674                         {
1675                         al=SSL_AD_DECODE_ERROR;
1676                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1677                         goto f_err;
1678                         }
1679                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1680                         {
1681                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1682                         goto err;
1683                         }
1684                 p+=i;
1685                 n-=param_len;
1686
1687 #ifndef OPENSSL_NO_RSA
1688                 if (alg_a & SSL_aRSA)
1689                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1690 #else
1691                 if (0)
1692                         ;
1693 #endif
1694 #ifndef OPENSSL_NO_DSA
1695                 else if (alg_a & SSL_aDSS)
1696                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1697 #endif
1698                 /* else anonymous DH, so no certificate or pkey. */
1699
1700                 s->session->sess_cert->peer_dh_tmp=dh;
1701                 dh=NULL;
1702                 }
1703         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1704                 {
1705                 al=SSL_AD_ILLEGAL_PARAMETER;
1706                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1707                 goto f_err;
1708                 }
1709 #endif /* !OPENSSL_NO_DH */
1710
1711 #ifndef OPENSSL_NO_ECDH
1712         else if (alg_k & SSL_kEECDH)
1713                 {
1714                 EC_GROUP *ngroup;
1715                 const EC_GROUP *group;
1716
1717                 if ((ecdh=EC_KEY_new()) == NULL)
1718                         {
1719                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1720                         goto err;
1721                         }
1722
1723                 /* Extract elliptic curve parameters and the
1724                  * server's ephemeral ECDH public key.
1725                  * Keep accumulating lengths of various components in
1726                  * param_len and make sure it never exceeds n.
1727                  */
1728
1729                 /* XXX: For now we only support named (not generic) curves
1730                  * and the ECParameters in this case is just three bytes.
1731                  */
1732                 param_len=3;
1733                 /* Check curve is one of our prefrences, if not server has
1734                  * sent an invalid curve.
1735                  */
1736                 if (!tls1_check_curve(s, p, param_len))
1737                         {
1738                         al=SSL_AD_DECODE_ERROR;
1739                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_CURVE);
1740                         goto f_err;
1741                         }
1742
1743                 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)
1744                         {
1745                         al=SSL_AD_INTERNAL_ERROR;
1746                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1747                         goto f_err;
1748                         }
1749
1750                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1751                 if (ngroup == NULL)
1752                         {
1753                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1754                         goto err;
1755                         }
1756                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1757                         {
1758                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1759                         goto err;
1760                         }
1761                 EC_GROUP_free(ngroup);
1762
1763                 group = EC_KEY_get0_group(ecdh);
1764
1765                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1766                     (EC_GROUP_get_degree(group) > 163))
1767                         {
1768                         al=SSL_AD_EXPORT_RESTRICTION;
1769                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1770                         goto f_err;
1771                         }
1772
1773                 p+=3;
1774
1775                 /* Next, get the encoded ECPoint */
1776                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1777                     ((bn_ctx = BN_CTX_new()) == NULL))
1778                         {
1779                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1780                         goto err;
1781                         }
1782
1783                 encoded_pt_len = *p;  /* length of encoded point */
1784                 p+=1;
1785                 param_len += (1 + encoded_pt_len);
1786                 if ((param_len > n) ||
1787                     (EC_POINT_oct2point(group, srvr_ecpoint,
1788                         p, encoded_pt_len, bn_ctx) == 0))
1789                         {
1790                         al=SSL_AD_DECODE_ERROR;
1791                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1792                         goto f_err;
1793                         }
1794
1795                 n-=param_len;
1796                 p+=encoded_pt_len;
1797
1798                 /* The ECC/TLS specification does not mention
1799                  * the use of DSA to sign ECParameters in the server
1800                  * key exchange message. We do support RSA and ECDSA.
1801                  */
1802                 if (0) ;
1803 #ifndef OPENSSL_NO_RSA
1804                 else if (alg_a & SSL_aRSA)
1805                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1806 #endif
1807 #ifndef OPENSSL_NO_ECDSA
1808                 else if (alg_a & SSL_aECDSA)
1809                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1810 #endif
1811                 /* else anonymous ECDH, so no certificate or pkey. */
1812                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1813                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1814                 ecdh=NULL;
1815                 BN_CTX_free(bn_ctx);
1816                 bn_ctx = NULL;
1817                 EC_POINT_free(srvr_ecpoint);
1818                 srvr_ecpoint = NULL;
1819                 }
1820         else if (alg_k)
1821                 {
1822                 al=SSL_AD_UNEXPECTED_MESSAGE;
1823                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1824                 goto f_err;
1825                 }
1826 #endif /* !OPENSSL_NO_ECDH */
1827
1828
1829         /* p points to the next byte, there are 'n' bytes left */
1830
1831         /* if it was signed, check the signature */
1832         if (pkey != NULL)
1833                 {
1834                 if (SSL_USE_SIGALGS(s))
1835                         {
1836                         int rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1837                         if (rv == -1)
1838                                 goto err;
1839                         else if (rv == 0)
1840                                 {
1841                                 al = SSL_AD_DECODE_ERROR;
1842                                 goto f_err;
1843                                 }
1844 #ifdef SSL_DEBUG
1845 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1846 #endif
1847                         p += 2;
1848                         n -= 2;
1849                         }
1850                 else
1851                         md = EVP_sha1();
1852
1853                 n2s(p,i);
1854                 n-=2;
1855                 j=EVP_PKEY_size(pkey);
1856
1857                 if ((i != n) || (n > j) || (n <= 0))
1858                         {
1859                         /* wrong packet length */
1860                         al=SSL_AD_DECODE_ERROR;
1861                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1862                         goto f_err;
1863                         }
1864
1865 #ifndef OPENSSL_NO_RSA
1866                 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
1867                         {
1868                         int num;
1869
1870                         j=0;
1871                         q=md_buf;
1872                         for (num=2; num > 0; num--)
1873                                 {
1874                                 EVP_MD_CTX_set_flags(&md_ctx,
1875                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1876                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1877                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1878                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1879                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1880                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1881                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1882                                 q+=i;
1883                                 j+=i;
1884                                 }
1885                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1886                                                                 pkey->pkey.rsa);
1887                         if (i < 0)
1888                                 {
1889                                 al=SSL_AD_DECRYPT_ERROR;
1890                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1891                                 goto f_err;
1892                                 }
1893                         if (i == 0)
1894                                 {
1895                                 /* bad signature */
1896                                 al=SSL_AD_DECRYPT_ERROR;
1897                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1898                                 goto f_err;
1899                                 }
1900                         }
1901                 else
1902 #endif
1903                         {
1904                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
1905                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1906                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1907                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1908                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1909                                 {
1910                                 /* bad signature */
1911                                 al=SSL_AD_DECRYPT_ERROR;
1912                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1913                                 goto f_err;
1914                                 }
1915                         }
1916                 }
1917         else
1918                 {
1919                 /* aNULL, aSRP or kPSK do not need public keys */
1920                 if (!(alg_a & (SSL_aNULL|SSL_aSRP)) && !(alg_k & SSL_kPSK))
1921                         {
1922                         /* Might be wrong key type, check it */
1923                         if (ssl3_check_cert_and_algorithm(s))
1924                                 /* Otherwise this shouldn't happen */
1925                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1926                         goto err;
1927                         }
1928                 /* still data left over */
1929                 if (n != 0)
1930                         {
1931                         al=SSL_AD_DECODE_ERROR;
1932                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1933                         goto f_err;
1934                         }
1935                 }
1936         EVP_PKEY_free(pkey);
1937         EVP_MD_CTX_cleanup(&md_ctx);
1938         return(1);
1939 f_err:
1940         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1941 err:
1942         EVP_PKEY_free(pkey);
1943 #ifndef OPENSSL_NO_RSA
1944         if (rsa != NULL)
1945                 RSA_free(rsa);
1946 #endif
1947 #ifndef OPENSSL_NO_DH
1948         if (dh != NULL)
1949                 DH_free(dh);
1950 #endif
1951 #ifndef OPENSSL_NO_ECDH
1952         BN_CTX_free(bn_ctx);
1953         EC_POINT_free(srvr_ecpoint);
1954         if (ecdh != NULL)
1955                 EC_KEY_free(ecdh);
1956 #endif
1957         EVP_MD_CTX_cleanup(&md_ctx);
1958         return(-1);
1959         }
1960
1961 int ssl3_get_certificate_request(SSL *s)
1962         {
1963         int ok,ret=0;
1964         unsigned long n,nc,l;
1965         unsigned int llen, ctype_num,i;
1966         X509_NAME *xn=NULL;
1967         const unsigned char *p,*q;
1968         unsigned char *d;
1969         STACK_OF(X509_NAME) *ca_sk=NULL;
1970
1971         n=s->method->ssl_get_message(s,
1972                 SSL3_ST_CR_CERT_REQ_A,
1973                 SSL3_ST_CR_CERT_REQ_B,
1974                 -1,
1975                 s->max_cert_list,
1976                 &ok);
1977
1978         if (!ok) return((int)n);
1979
1980         s->s3->tmp.cert_req=0;
1981
1982         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1983                 {
1984                 s->s3->tmp.reuse_message=1;
1985                 /* If we get here we don't need any cached handshake records
1986                  * as we wont be doing client auth.
1987                  */
1988                 if (s->s3->handshake_buffer)
1989                         {
1990                         if (!ssl3_digest_cached_records(s))
1991                                 goto err;
1992                         }
1993                 return(1);
1994                 }
1995
1996         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1997                 {
1998                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1999                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
2000                 goto err;
2001                 }
2002
2003         /* TLS does not like anon-DH with client cert */
2004         if (s->version > SSL3_VERSION)
2005                 {
2006                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
2007                         {
2008                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2009                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2010                         goto err;
2011                         }
2012                 }
2013
2014         p=d=(unsigned char *)s->init_msg;
2015
2016         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
2017                 {
2018                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2019                 goto err;
2020                 }
2021
2022         /* get the certificate types */
2023         ctype_num= *(p++);
2024         if (s->cert->ctypes)
2025                 {
2026                 OPENSSL_free(s->cert->ctypes);
2027                 s->cert->ctypes = NULL;
2028                 }
2029         if (ctype_num > SSL3_CT_NUMBER)
2030                 {
2031                 /* If we exceed static buffer copy all to cert structure */
2032                 s->cert->ctypes = OPENSSL_malloc(ctype_num);
2033                 memcpy(s->cert->ctypes, p, ctype_num);
2034                 s->cert->ctype_num = (size_t)ctype_num;
2035                 ctype_num=SSL3_CT_NUMBER;
2036                 }
2037         for (i=0; i<ctype_num; i++)
2038                 s->s3->tmp.ctype[i]= p[i];
2039         p+=p[-1];
2040         if (SSL_USE_SIGALGS(s))
2041                 {
2042                 n2s(p, llen);
2043                 /* Check we have enough room for signature algorithms and
2044                  * following length value.
2045                  */
2046                 if ((unsigned long)(p - d + llen + 2) > n)
2047                         {
2048                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2049                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
2050                         goto err;
2051                         }
2052                 /* Clear certificate digests and validity flags */
2053                 for (i = 0; i < SSL_PKEY_NUM; i++)
2054                         {
2055                         s->cert->pkeys[i].digest = NULL;
2056                         s->cert->pkeys[i].valid_flags = 0;
2057                         }
2058                 if ((llen & 1) || !tls1_process_sigalgs(s, p, llen))
2059                         {
2060                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2061                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2062                         goto err;
2063                         }
2064                 p += llen;
2065                 }
2066
2067         /* get the CA RDNs */
2068         n2s(p,llen);
2069 #if 0
2070 {
2071 FILE *out;
2072 out=fopen("/tmp/vsign.der","w");
2073 fwrite(p,1,llen,out);
2074 fclose(out);
2075 }
2076 #endif
2077
2078         if ((unsigned long)(p - d + llen) != n)
2079                 {
2080                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2081                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
2082                 goto err;
2083                 }
2084
2085         for (nc=0; nc<llen; )
2086                 {
2087                 n2s(p,l);
2088                 if ((l+nc+2) > llen)
2089                         {
2090                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2091                                 goto cont; /* netscape bugs */
2092                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2093                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2094                         goto err;
2095                         }
2096
2097                 q=p;
2098
2099                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2100                         {
2101                         /* If netscape tolerance is on, ignore errors */
2102                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2103                                 goto cont;
2104                         else
2105                                 {
2106                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2107                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2108                                 goto err;
2109                                 }
2110                         }
2111
2112                 if (q != (p+l))
2113                         {
2114                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2115                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2116                         goto err;
2117                         }
2118                 if (!sk_X509_NAME_push(ca_sk,xn))
2119                         {
2120                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2121                         goto err;
2122                         }
2123
2124                 p+=l;
2125                 nc+=l+2;
2126                 }
2127
2128         if (0)
2129                 {
2130 cont:
2131                 ERR_clear_error();
2132                 }
2133
2134         /* we should setup a certificate to return.... */
2135         s->s3->tmp.cert_req=1;
2136         s->s3->tmp.ctype_num=ctype_num;
2137         if (s->s3->tmp.ca_names != NULL)
2138                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2139         s->s3->tmp.ca_names=ca_sk;
2140         ca_sk=NULL;
2141
2142         ret=1;
2143 err:
2144         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2145         return(ret);
2146         }
2147
2148 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2149         {
2150         return(X509_NAME_cmp(*a,*b));
2151         }
2152 #ifndef OPENSSL_NO_TLSEXT
2153 int ssl3_get_new_session_ticket(SSL *s)
2154         {
2155         int ok,al,ret=0, ticklen;
2156         long n;
2157         const unsigned char *p;
2158         unsigned char *d;
2159
2160         n=s->method->ssl_get_message(s,
2161                 SSL3_ST_CR_SESSION_TICKET_A,
2162                 SSL3_ST_CR_SESSION_TICKET_B,
2163                 -1,
2164                 16384,
2165                 &ok);
2166
2167         if (!ok)
2168                 return((int)n);
2169
2170         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2171                 {
2172                 s->s3->tmp.reuse_message=1;
2173                 return(1);
2174                 }
2175         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2176                 {
2177                 al=SSL_AD_UNEXPECTED_MESSAGE;
2178                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2179                 goto f_err;
2180                 }
2181         if (n < 6)
2182                 {
2183                 /* need at least ticket_lifetime_hint + ticket length */
2184                 al = SSL_AD_DECODE_ERROR;
2185                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2186                 goto f_err;
2187                 }
2188
2189         p=d=(unsigned char *)s->init_msg;
2190         n2l(p, s->session->tlsext_tick_lifetime_hint);
2191         n2s(p, ticklen);
2192         /* ticket_lifetime_hint + ticket_length + ticket */
2193         if (ticklen + 6 != n)
2194                 {
2195                 al = SSL_AD_DECODE_ERROR;
2196                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2197                 goto f_err;
2198                 }
2199         if (s->session->tlsext_tick)
2200                 {
2201                 OPENSSL_free(s->session->tlsext_tick);
2202                 s->session->tlsext_ticklen = 0;
2203                 }
2204         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2205         if (!s->session->tlsext_tick)
2206                 {
2207                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2208                 goto err;
2209                 }
2210         memcpy(s->session->tlsext_tick, p, ticklen);
2211         s->session->tlsext_ticklen = ticklen;
2212         /* There are two ways to detect a resumed ticket sesion.
2213          * One is to set an appropriate session ID and then the server
2214          * must return a match in ServerHello. This allows the normal
2215          * client session ID matching to work and we know much
2216          * earlier that the ticket has been accepted.
2217          *
2218          * The other way is to set zero length session ID when the
2219          * ticket is presented and rely on the handshake to determine
2220          * session resumption.
2221          *
2222          * We choose the former approach because this fits in with
2223          * assumptions elsewhere in OpenSSL. The session ID is set
2224          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2225          * ticket.
2226          */
2227         EVP_Digest(p, ticklen,
2228                         s->session->session_id, &s->session->session_id_length,
2229 #ifndef OPENSSL_NO_SHA256
2230                                                         EVP_sha256(), NULL);
2231 #else
2232                                                         EVP_sha1(), NULL);
2233 #endif
2234         ret=1;
2235         return(ret);
2236 f_err:
2237         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2238 err:
2239         return(-1);
2240         }
2241
2242 int ssl3_get_cert_status(SSL *s)
2243         {
2244         int ok, al;
2245         unsigned long resplen,n;
2246         const unsigned char *p;
2247
2248         n=s->method->ssl_get_message(s,
2249                 SSL3_ST_CR_CERT_STATUS_A,
2250                 SSL3_ST_CR_CERT_STATUS_B,
2251                 SSL3_MT_CERTIFICATE_STATUS,
2252                 16384,
2253                 &ok);
2254
2255         if (!ok) return((int)n);
2256         if (n < 4)
2257                 {
2258                 /* need at least status type + length */
2259                 al = SSL_AD_DECODE_ERROR;
2260                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2261                 goto f_err;
2262                 }
2263         p = (unsigned char *)s->init_msg;
2264         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2265                 {
2266                 al = SSL_AD_DECODE_ERROR;
2267                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2268                 goto f_err;
2269                 }
2270         n2l3(p, resplen);
2271         if (resplen + 4 != n)
2272                 {
2273                 al = SSL_AD_DECODE_ERROR;
2274                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2275                 goto f_err;
2276                 }
2277         if (s->tlsext_ocsp_resp)
2278                 OPENSSL_free(s->tlsext_ocsp_resp);
2279         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2280         if (!s->tlsext_ocsp_resp)
2281                 {
2282                 al = SSL_AD_INTERNAL_ERROR;
2283                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2284                 goto f_err;
2285                 }
2286         s->tlsext_ocsp_resplen = resplen;
2287         if (s->ctx->tlsext_status_cb)
2288                 {
2289                 int ret;
2290                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2291                 if (ret == 0)
2292                         {
2293                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2294                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2295                         goto f_err;
2296                         }
2297                 if (ret < 0)
2298                         {
2299                         al = SSL_AD_INTERNAL_ERROR;
2300                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2301                         goto f_err;
2302                         }
2303                 }
2304         return 1;
2305 f_err:
2306         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2307         return(-1);
2308         }
2309 #endif
2310
2311 int ssl3_get_server_done(SSL *s)
2312         {
2313         int ok,ret=0;
2314         long n;
2315
2316         n=s->method->ssl_get_message(s,
2317                 SSL3_ST_CR_SRVR_DONE_A,
2318                 SSL3_ST_CR_SRVR_DONE_B,
2319                 SSL3_MT_SERVER_DONE,
2320                 30, /* should be very small, like 0 :-) */
2321                 &ok);
2322
2323         if (!ok) return((int)n);
2324         if (n > 0)
2325                 {
2326                 /* should contain no data */
2327                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2328                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2329                 return -1;
2330                 }
2331         ret=1;
2332         return(ret);
2333         }
2334
2335
2336 int ssl3_send_client_key_exchange(SSL *s)
2337         {
2338         unsigned char *p;
2339         int n;
2340         unsigned long alg_k;
2341 #ifndef OPENSSL_NO_RSA
2342         unsigned char *q;
2343         EVP_PKEY *pkey=NULL;
2344 #endif
2345 #ifndef OPENSSL_NO_KRB5
2346         KSSL_ERR kssl_err;
2347 #endif /* OPENSSL_NO_KRB5 */
2348 #ifndef OPENSSL_NO_ECDH
2349         EC_KEY *clnt_ecdh = NULL;
2350         const EC_POINT *srvr_ecpoint = NULL;
2351         EVP_PKEY *srvr_pub_pkey = NULL;
2352         unsigned char *encodedPoint = NULL;
2353         int encoded_pt_len = 0;
2354         BN_CTX * bn_ctx = NULL;
2355 #endif
2356
2357         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2358                 {
2359                 p = ssl_handshake_start(s);
2360
2361                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2362
2363                 /* Fool emacs indentation */
2364                 if (0) {}
2365 #ifndef OPENSSL_NO_RSA
2366                 else if (alg_k & SSL_kRSA)
2367                         {
2368                         RSA *rsa;
2369                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2370
2371                         if (s->session->sess_cert == NULL)
2372                                 {
2373                                 /* We should always have a server certificate with SSL_kRSA. */
2374                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2375                                 goto err;
2376                                 }
2377
2378                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2379                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2380                         else
2381                                 {
2382                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2383                                 if ((pkey == NULL) ||
2384                                         (pkey->type != EVP_PKEY_RSA) ||
2385                                         (pkey->pkey.rsa == NULL))
2386                                         {
2387                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2388                                         goto err;
2389                                         }
2390                                 rsa=pkey->pkey.rsa;
2391                                 EVP_PKEY_free(pkey);
2392                                 }
2393
2394                         tmp_buf[0]=s->client_version>>8;
2395                         tmp_buf[1]=s->client_version&0xff;
2396                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2397                                         goto err;
2398
2399                         s->session->master_key_length=sizeof tmp_buf;
2400
2401                         q=p;
2402                         /* Fix buf for TLS and beyond */
2403                         if (s->version > SSL3_VERSION)
2404                                 p+=2;
2405                         n=RSA_public_encrypt(sizeof tmp_buf,
2406                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2407 #ifdef PKCS1_CHECK
2408                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2409                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2410 #endif
2411                         if (n <= 0)
2412                                 {
2413                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2414                                 goto err;
2415                                 }
2416
2417                         /* Fix buf for TLS and beyond */
2418                         if (s->version > SSL3_VERSION)
2419                                 {
2420                                 s2n(n,q);
2421                                 n+=2;
2422                                 }
2423
2424                         s->session->master_key_length=
2425                                 s->method->ssl3_enc->generate_master_secret(s,
2426                                         s->session->master_key,
2427                                         tmp_buf,sizeof tmp_buf);
2428                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2429                         }
2430 #endif
2431 #ifndef OPENSSL_NO_KRB5
2432                 else if (alg_k & SSL_kKRB5)
2433                         {
2434                         krb5_error_code krb5rc;
2435                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2436                         /*  krb5_data   krb5_ap_req;  */
2437                         krb5_data       *enc_ticket;
2438                         krb5_data       authenticator, *authp = NULL;
2439                         EVP_CIPHER_CTX  ciph_ctx;
2440                         const EVP_CIPHER *enc = NULL;
2441                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2442                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2443                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2444                                                 + EVP_MAX_IV_LENGTH];
2445                         int             padl, outl = sizeof(epms);
2446
2447                         EVP_CIPHER_CTX_init(&ciph_ctx);
2448
2449 #ifdef KSSL_DEBUG
2450                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2451                                 alg_k, SSL_kKRB5);
2452 #endif  /* KSSL_DEBUG */
2453
2454                         authp = NULL;
2455 #ifdef KRB5SENDAUTH
2456                         if (KRB5SENDAUTH)  authp = &authenticator;
2457 #endif  /* KRB5SENDAUTH */
2458
2459                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2460                                 &kssl_err);
2461                         enc = kssl_map_enc(kssl_ctx->enctype);
2462                         if (enc == NULL)
2463                             goto err;
2464 #ifdef KSSL_DEBUG
2465                         {
2466                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2467                         if (krb5rc && kssl_err.text)
2468                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2469                         }
2470 #endif  /* KSSL_DEBUG */
2471
2472                         if (krb5rc)
2473                                 {
2474                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2475                                                 SSL_AD_HANDSHAKE_FAILURE);
2476                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2477                                                 kssl_err.reason);
2478                                 goto err;
2479                                 }
2480
2481                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2482                         **  in place of RFC 2712 KerberosWrapper, as in:
2483                         **
2484                         **  Send ticket (copy to *p, set n = length)
2485                         **  n = krb5_ap_req.length;
2486                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2487                         **  if (krb5_ap_req.data)
2488                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2489                         **
2490                         **  Now using real RFC 2712 KerberosWrapper
2491                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2492                         **  Note: 2712 "opaque" types are here replaced
2493                         **  with a 2-byte length followed by the value.
2494                         **  Example:
2495                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2496                         **  Where "xx xx" = length bytes.  Shown here with
2497                         **  optional authenticator omitted.
2498                         */
2499
2500                         /*  KerberosWrapper.Ticket              */
2501                         s2n(enc_ticket->length,p);
2502                         memcpy(p, enc_ticket->data, enc_ticket->length);
2503                         p+= enc_ticket->length;
2504                         n = enc_ticket->length + 2;
2505
2506                         /*  KerberosWrapper.Authenticator       */
2507                         if (authp  &&  authp->length)
2508                                 {
2509                                 s2n(authp->length,p);
2510                                 memcpy(p, authp->data, authp->length);
2511                                 p+= authp->length;
2512                                 n+= authp->length + 2;
2513
2514                                 free(authp->data);
2515                                 authp->data = NULL;
2516                                 authp->length = 0;
2517                                 }
2518                         else
2519                                 {
2520                                 s2n(0,p);/*  null authenticator length  */
2521                                 n+=2;
2522                                 }
2523
2524                             tmp_buf[0]=s->client_version>>8;
2525                             tmp_buf[1]=s->client_version&0xff;
2526                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2527                                 goto err;
2528
2529                         /*  20010420 VRS.  Tried it this way; failed.
2530                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2531                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2532                         **                              kssl_ctx->length);
2533                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2534                         */
2535
2536                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2537                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2538                                 kssl_ctx->key,iv);
2539                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2540                                 sizeof tmp_buf);
2541                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2542                         outl += padl;
2543                         if (outl > (int)sizeof epms)
2544                                 {
2545                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2546                                 goto err;
2547                                 }
2548                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2549
2550                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2551                         s2n(outl,p);
2552                         memcpy(p, epms, outl);
2553                         p+=outl;
2554                         n+=outl + 2;
2555
2556                         s->session->master_key_length=
2557                                 s->method->ssl3_enc->generate_master_secret(s,
2558                                         s->session->master_key,
2559                                         tmp_buf, sizeof tmp_buf);
2560
2561                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2562                         OPENSSL_cleanse(epms, outl);
2563                         }
2564 #endif
2565 #ifndef OPENSSL_NO_DH
2566                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2567                         {
2568                         DH *dh_srvr,*dh_clnt;
2569                         SESS_CERT *scert = s->session->sess_cert;
2570
2571                         if (scert == NULL)
2572                                 {
2573                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2574                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2575                                 goto err;
2576                                 }
2577
2578                         if (scert->peer_dh_tmp != NULL)
2579                                 dh_srvr=scert->peer_dh_tmp;
2580                         else
2581                                 {
2582                                 /* we get them from the cert */
2583                                 int idx = scert->peer_cert_type;
2584                                 EVP_PKEY *spkey = NULL;
2585                                 dh_srvr = NULL;
2586                                 if (idx >= 0)
2587                                         spkey = X509_get_pubkey(
2588                                                 scert->peer_pkeys[idx].x509);
2589                                 if (spkey)
2590                                         {
2591                                         dh_srvr = EVP_PKEY_get1_DH(spkey);
2592                                         EVP_PKEY_free(spkey);
2593                                         }
2594                                 if (dh_srvr == NULL)
2595                                         {
2596                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2597                                             ERR_R_INTERNAL_ERROR);
2598                                         goto err;
2599                                         }
2600                                 }
2601                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2602                                 {
2603                                 /* Use client certificate key */
2604                                 EVP_PKEY *clkey = s->cert->key->privatekey;
2605                                 dh_clnt = NULL;
2606                                 if (clkey)
2607                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2608                                 if (dh_clnt == NULL)
2609                                         {
2610                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2611                                             ERR_R_INTERNAL_ERROR);
2612                                         goto err;
2613                                         }
2614                                 }
2615                         else
2616                                 {
2617                                 /* generate a new random key */
2618                                 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2619                                         {
2620                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2621                                         goto err;
2622                                         }
2623                                 if (!DH_generate_key(dh_clnt))
2624                                         {
2625                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2626                                         DH_free(dh_clnt);
2627                                         goto err;
2628                                         }
2629                                 }
2630
2631                         /* use the 'p' output buffer for the DH key, but
2632                          * make sure to clear it out afterwards */
2633
2634                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2635                         if (scert->peer_dh_tmp == NULL)
2636                                 DH_free(dh_srvr);
2637
2638                         if (n <= 0)
2639                                 {
2640                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2641                                 DH_free(dh_clnt);
2642                                 goto err;
2643                                 }
2644
2645                         /* generate master key from the result */
2646                         s->session->master_key_length=
2647                                 s->method->ssl3_enc->generate_master_secret(s,
2648                                         s->session->master_key,p,n);
2649                         /* clean up */
2650                         memset(p,0,n);
2651
2652                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2653                                 n = 0;
2654                         else
2655                                 {
2656                                 /* send off the data */
2657                                 n=BN_num_bytes(dh_clnt->pub_key);
2658                                 s2n(n,p);
2659                                 BN_bn2bin(dh_clnt->pub_key,p);
2660                                 n+=2;
2661                                 }
2662
2663                         DH_free(dh_clnt);
2664
2665                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2666                         }
2667 #endif
2668
2669 #ifndef OPENSSL_NO_ECDH
2670                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2671                         {
2672                         const EC_GROUP *srvr_group = NULL;
2673                         EC_KEY *tkey;
2674                         int ecdh_clnt_cert = 0;
2675                         int field_size = 0;
2676
2677                         if (s->session->sess_cert == NULL)
2678                                 {
2679                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2680                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2681                                 goto err;
2682                                 }
2683
2684                         /* Did we send out the client's
2685                          * ECDH share for use in premaster
2686                          * computation as part of client certificate?
2687                          * If so, set ecdh_clnt_cert to 1.
2688                          */
2689                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2690                                 {
2691                                 /* XXX: For now, we do not support client
2692                                  * authentication using ECDH certificates.
2693                                  * To add such support, one needs to add
2694                                  * code that checks for appropriate
2695                                  * conditions and sets ecdh_clnt_cert to 1.
2696                                  * For example, the cert have an ECC
2697                                  * key on the same curve as the server's
2698                                  * and the key should be authorized for
2699                                  * key agreement.
2700                                  *
2701                                  * One also needs to add code in ssl3_connect
2702                                  * to skip sending the certificate verify
2703                                  * message.
2704                                  *
2705                                  * if ((s->cert->key->privatekey != NULL) &&
2706                                  *     (s->cert->key->privatekey->type ==
2707                                  *      EVP_PKEY_EC) && ...)
2708                                  * ecdh_clnt_cert = 1;
2709                                  */
2710                                 }
2711
2712                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2713                                 {
2714                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2715                                 }
2716                         else
2717                                 {
2718                                 /* Get the Server Public Key from Cert */
2719                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2720                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2721                                 if ((srvr_pub_pkey == NULL) ||
2722                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2723                                     (srvr_pub_pkey->pkey.ec == NULL))
2724                                         {
2725                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2726                                             ERR_R_INTERNAL_ERROR);
2727                                         goto err;
2728                                         }
2729
2730                                 tkey = srvr_pub_pkey->pkey.ec;
2731                                 }
2732
2733                         srvr_group   = EC_KEY_get0_group(tkey);
2734                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2735
2736                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2737                                 {
2738                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2739                                     ERR_R_INTERNAL_ERROR);
2740                                 goto err;
2741                                 }
2742
2743                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2744                                 {
2745                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2746                                 goto err;
2747                                 }
2748
2749                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2750                                 {
2751                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2752                                 goto err;
2753                                 }
2754                         if (ecdh_clnt_cert)
2755                                 {
2756                                 /* Reuse key info from our certificate
2757                                  * We only need our private key to perform
2758                                  * the ECDH computation.
2759                                  */
2760                                 const BIGNUM *priv_key;
2761                                 tkey = s->cert->key->privatekey->pkey.ec;
2762                                 priv_key = EC_KEY_get0_private_key(tkey);
2763                                 if (priv_key == NULL)
2764                                         {
2765                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2766                                         goto err;
2767                                         }
2768                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2769                                         {
2770                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2771                                         goto err;
2772                                         }
2773                                 }
2774                         else
2775                                 {
2776                                 /* Generate a new ECDH key pair */
2777                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2778                                         {
2779                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2780                                         goto err;
2781                                         }
2782                                 }
2783
2784                         /* use the 'p' output buffer for the ECDH key, but
2785                          * make sure to clear it out afterwards
2786                          */
2787
2788                         field_size = EC_GROUP_get_degree(srvr_group);
2789                         if (field_size <= 0)
2790                                 {
2791                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2792                                        ERR_R_ECDH_LIB);
2793                                 goto err;
2794                                 }
2795                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2796                         if (n <= 0)
2797                                 {
2798                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2799                                        ERR_R_ECDH_LIB);
2800                                 goto err;
2801                                 }
2802
2803                         /* generate master key from the result */
2804                         s->session->master_key_length = s->method->ssl3_enc \
2805                             -> generate_master_secret(s,
2806                                 s->session->master_key,
2807                                 p, n);
2808
2809                         memset(p, 0, n); /* clean up */
2810
2811                         if (ecdh_clnt_cert)
2812                                 {
2813                                 /* Send empty client key exch message */
2814                                 n = 0;
2815                                 }
2816                         else
2817                                 {
2818                                 /* First check the size of encoding and
2819                                  * allocate memory accordingly.
2820                                  */
2821                                 encoded_pt_len =
2822                                     EC_POINT_point2oct(srvr_group,
2823                                         EC_KEY_get0_public_key(clnt_ecdh),
2824                                         POINT_CONVERSION_UNCOMPRESSED,
2825                                         NULL, 0, NULL);
2826
2827                                 encodedPoint = (unsigned char *)
2828                                     OPENSSL_malloc(encoded_pt_len *
2829                                         sizeof(unsigned char));
2830                                 bn_ctx = BN_CTX_new();
2831                                 if ((encodedPoint == NULL) ||
2832                                     (bn_ctx == NULL))
2833                                         {
2834                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2835                                         goto err;
2836                                         }
2837
2838                                 /* Encode the public key */
2839                                 n = EC_POINT_point2oct(srvr_group,
2840                                     EC_KEY_get0_public_key(clnt_ecdh),
2841                                     POINT_CONVERSION_UNCOMPRESSED,
2842                                     encodedPoint, encoded_pt_len, bn_ctx);
2843
2844                                 *p = n; /* length of encoded point */
2845                                 /* Encoded point will be copied here */
2846                                 p += 1;
2847                                 /* copy the point */
2848                                 memcpy((unsigned char *)p, encodedPoint, n);
2849                                 /* increment n to account for length field */
2850                                 n += 1;
2851                                 }
2852
2853                         /* Free allocated memory */
2854                         BN_CTX_free(bn_ctx);
2855                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2856                         if (clnt_ecdh != NULL)
2857                                  EC_KEY_free(clnt_ecdh);
2858                         EVP_PKEY_free(srvr_pub_pkey);
2859                         }
2860 #endif /* !OPENSSL_NO_ECDH */
2861                 else if (alg_k & SSL_kGOST)
2862                         {
2863                         /* GOST key exchange message creation */
2864                         EVP_PKEY_CTX *pkey_ctx;
2865                         X509 *peer_cert;
2866                         size_t msglen;
2867                         unsigned int md_len;
2868                         int keytype;
2869                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2870                         EVP_MD_CTX *ukm_hash;
2871                         EVP_PKEY *pub_key;
2872
2873                         /* Get server sertificate PKEY and create ctx from it */
2874                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2875                         if (!peer_cert)
2876                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2877                         if (!peer_cert)         {
2878                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2879                                         goto err;
2880                                 }
2881
2882                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2883                         /* If we have send a certificate, and certificate key
2884
2885                          * parameters match those of server certificate, use
2886                          * certificate key for key exchange
2887                          */
2888
2889                          /* Otherwise, generate ephemeral key pair */
2890
2891                         EVP_PKEY_encrypt_init(pkey_ctx);
2892                           /* Generate session key */
2893                     RAND_bytes(premaster_secret,32);
2894                         /* If we have client certificate, use its secret as peer key */
2895                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
2896                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
2897                                         /* If there was an error - just ignore it. Ephemeral key
2898                                         * would be used
2899                                         */
2900                                         ERR_clear_error();
2901                                 }
2902                         }
2903                         /* Compute shared IV and store it in algorithm-specific
2904                          * context data */
2905                         ukm_hash = EVP_MD_CTX_create();
2906                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
2907                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
2908                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
2909                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
2910                         EVP_MD_CTX_destroy(ukm_hash);
2911                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
2912                                 8,shared_ukm)<0) {
2913                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2914                                                 SSL_R_LIBRARY_BUG);
2915                                         goto err;
2916                                 }
2917                         /* Make GOST keytransport blob message */
2918                         /*Encapsulate it into sequence */
2919                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
2920                         msglen=255;
2921                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
2922                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2923                                         SSL_R_LIBRARY_BUG);
2924                                 goto err;
2925                         }
2926                         if (msglen >= 0x80)
2927                                 {
2928                                 *(p++)=0x81;
2929                                 *(p++)= msglen & 0xff;
2930                                 n=msglen+3;
2931                                 }
2932                         else
2933                                 {
2934                                 *(p++)= msglen & 0xff;
2935                                 n=msglen+2;
2936                                 }
2937                         memcpy(p, tmp, msglen);
2938                         /* Check if pubkey from client certificate was used */
2939                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
2940                                 {
2941                                 /* Set flag "skip certificate verify" */
2942                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
2943                                 }
2944                         EVP_PKEY_CTX_free(pkey_ctx);
2945                         s->session->master_key_length=
2946                                 s->method->ssl3_enc->generate_master_secret(s,
2947                                         s->session->master_key,premaster_secret,32);
2948                         EVP_PKEY_free(pub_key);
2949
2950                         }
2951 #ifndef OPENSSL_NO_SRP
2952                 else if (alg_k & SSL_kSRP)
2953                         {
2954                         if (s->srp_ctx.A != NULL)
2955                                 {
2956                                 /* send off the data */
2957                                 n=BN_num_bytes(s->srp_ctx.A);
2958                                 s2n(n,p);
2959                                 BN_bn2bin(s->srp_ctx.A,p);
2960                                 n+=2;
2961                                 }
2962                         else
2963                                 {
2964                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2965                                 goto err;
2966                                 }
2967                         if (s->session->srp_username != NULL)
2968                                 OPENSSL_free(s->session->srp_username);
2969                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
2970                         if (s->session->srp_username == NULL)
2971                                 {
2972                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2973                                         ERR_R_MALLOC_FAILURE);
2974                                 goto err;
2975                                 }
2976
2977                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
2978                                 {
2979                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2980                                 goto err;
2981                                 }
2982                         }
2983 #endif
2984 #ifndef OPENSSL_NO_PSK
2985                 else if (alg_k & SSL_kPSK)
2986                         {
2987                         char identity[PSK_MAX_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                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
3002                                 identity, PSK_MAX_IDENTITY_LEN,
3003                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
3004                         if (psk_len > PSK_MAX_PSK_LEN)
3005                                 {
3006                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3007                                         ERR_R_INTERNAL_ERROR);
3008                                 goto psk_err;
3009                                 }
3010                         else if (psk_len == 0)
3011                                 {
3012                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3013                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
3014                                 goto psk_err;
3015                                 }
3016
3017                         /* create PSK pre_master_secret */
3018                         pre_ms_len = 2+psk_len+2+psk_len;
3019                         t = psk_or_pre_ms;
3020                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
3021                         s2n(psk_len, t);
3022                         memset(t, 0, psk_len);
3023                         t+=psk_len;
3024                         s2n(psk_len, t);
3025
3026                         if (s->session->psk_identity_hint != NULL)
3027                                 OPENSSL_free(s->session->psk_identity_hint);
3028                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
3029                         if (s->ctx->psk_identity_hint != NULL &&
3030                                 s->session->psk_identity_hint == NULL)
3031                                 {
3032                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3033                                         ERR_R_MALLOC_FAILURE);
3034                                 goto psk_err;
3035                                 }
3036
3037                         if (s->session->psk_identity != NULL)
3038                                 OPENSSL_free(s->session->psk_identity);
3039                         s->session->psk_identity = BUF_strdup(identity);
3040                         if (s->session->psk_identity == NULL)
3041                                 {
3042                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3043                                         ERR_R_MALLOC_FAILURE);
3044                                 goto psk_err;
3045                                 }
3046
3047                         s->session->master_key_length =
3048                                 s->method->ssl3_enc->generate_master_secret(s,
3049                                         s->session->master_key,
3050                                         psk_or_pre_ms, pre_ms_len);
3051                         n = strlen(identity);
3052                         s2n(n, p);
3053                         memcpy(p, identity, n);
3054                         n+=2;
3055                         psk_err = 0;
3056                 psk_err:
3057                         OPENSSL_cleanse(identity, PSK_MAX_IDENTITY_LEN);
3058                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
3059                         if (psk_err != 0)
3060                                 {
3061                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3062                                 goto err;
3063                                 }
3064                         }
3065 #endif
3066                 else
3067                         {
3068                         ssl3_send_alert(s, SSL3_AL_FATAL,
3069                             SSL_AD_HANDSHAKE_FAILURE);
3070                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3071                             ERR_R_INTERNAL_ERROR);
3072                         goto err;
3073                         }
3074
3075                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_KEY_EXCHANGE, n);
3076                 s->state=SSL3_ST_CW_KEY_EXCH_B;
3077                 }
3078
3079         /* SSL3_ST_CW_KEY_EXCH_B */
3080         return ssl_do_write(s);
3081 err:
3082 #ifndef OPENSSL_NO_ECDH
3083         BN_CTX_free(bn_ctx);
3084         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
3085         if (clnt_ecdh != NULL)
3086                 EC_KEY_free(clnt_ecdh);
3087         EVP_PKEY_free(srvr_pub_pkey);
3088 #endif
3089         return(-1);
3090         }
3091
3092 int ssl3_send_client_verify(SSL *s)
3093         {
3094         unsigned char *p;
3095         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
3096         EVP_PKEY *pkey;
3097         EVP_PKEY_CTX *pctx=NULL;
3098         EVP_MD_CTX mctx;
3099         unsigned u=0;
3100         unsigned long n;
3101         int j;
3102
3103         EVP_MD_CTX_init(&mctx);
3104
3105         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
3106                 {
3107                 p= ssl_handshake_start(s);
3108                 pkey=s->cert->key->privatekey;
3109 /* Create context from key and test if sha1 is allowed as digest */
3110                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
3111                 EVP_PKEY_sign_init(pctx);
3112                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
3113                         {
3114                         if (!SSL_USE_SIGALGS(s))
3115                                 s->method->ssl3_enc->cert_verify_mac(s,
3116                                                 NID_sha1,
3117                                                 &(data[MD5_DIGEST_LENGTH]));
3118                         }
3119                 else
3120                         {
3121                         ERR_clear_error();
3122                         }
3123                 /* For TLS v1.2 send signature algorithm and signature
3124                  * using agreed digest and cached handshake records.
3125                  */
3126                 if (SSL_USE_SIGALGS(s))
3127                         {
3128                         long hdatalen = 0;
3129                         void *hdata;
3130                         const EVP_MD *md = s->cert->key->digest;
3131                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
3132                                                                 &hdata);
3133                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
3134                                 {
3135                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3136                                                 ERR_R_INTERNAL_ERROR);
3137                                 goto err;
3138                                 }
3139                         p += 2;
3140 #ifdef SSL_DEBUG
3141                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3142                                                         EVP_MD_name(md));
3143 #endif
3144                         if (!EVP_SignInit_ex(&mctx, md, NULL)
3145                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3146                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
3147                                 {
3148                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3149                                                 ERR_R_EVP_LIB);
3150                                 goto err;
3151                                 }
3152                         s2n(u,p);
3153                         n = u + 4;
3154                         if (!ssl3_digest_cached_records(s))
3155                                 goto err;
3156                         }
3157                 else
3158 #ifndef OPENSSL_NO_RSA
3159                 if (pkey->type == EVP_PKEY_RSA)
3160                         {
3161                         s->method->ssl3_enc->cert_verify_mac(s,
3162                                 NID_md5,
3163                                 &(data[0]));
3164                         if (RSA_sign(NID_md5_sha1, data,
3165                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
3166                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3167                                 {
3168                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3169                                 goto err;
3170                                 }
3171                         s2n(u,p);
3172                         n=u+2;
3173                         }
3174                 else
3175 #endif
3176 #ifndef OPENSSL_NO_DSA
3177                         if (pkey->type == EVP_PKEY_DSA)
3178                         {
3179                         if (!DSA_sign(pkey->save_type,
3180                                 &(data[MD5_DIGEST_LENGTH]),
3181                                 SHA_DIGEST_LENGTH,&(p[2]),
3182                                 (unsigned int *)&j,pkey->pkey.dsa))
3183                                 {
3184                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3185                                 goto err;
3186                                 }
3187                         s2n(j,p);
3188                         n=j+2;
3189                         }
3190                 else
3191 #endif
3192 #ifndef OPENSSL_NO_ECDSA
3193                         if (pkey->type == EVP_PKEY_EC)
3194                         {
3195                         if (!ECDSA_sign(pkey->save_type,
3196                                 &(data[MD5_DIGEST_LENGTH]),
3197                                 SHA_DIGEST_LENGTH,&(p[2]),
3198                                 (unsigned int *)&j,pkey->pkey.ec))
3199                                 {
3200                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3201                                     ERR_R_ECDSA_LIB);
3202                                 goto err;
3203                                 }
3204                         s2n(j,p);
3205                         n=j+2;
3206                         }
3207                 else
3208 #endif
3209                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3210                 {
3211                 unsigned char signbuf[64];
3212                 int i;
3213                 size_t sigsize=64;
3214                 s->method->ssl3_enc->cert_verify_mac(s,
3215                         NID_id_GostR3411_94,
3216                         data);
3217                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3218                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3219                         ERR_R_INTERNAL_ERROR);
3220                         goto err;
3221                 }
3222                 for (i=63,j=0; i>=0; j++, i--) {
3223                         p[2+j]=signbuf[i];
3224                 }
3225                 s2n(j,p);
3226                 n=j+2;
3227                 }
3228                 else
3229                 {
3230                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3231                         goto err;
3232                 }
3233                 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_VERIFY, n);
3234                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3235                 }
3236         EVP_MD_CTX_cleanup(&mctx);
3237         EVP_PKEY_CTX_free(pctx);
3238         return ssl_do_write(s);
3239 err:
3240         EVP_MD_CTX_cleanup(&mctx);
3241         EVP_PKEY_CTX_free(pctx);
3242         return(-1);
3243         }
3244
3245 /* Check a certificate can be used for client authentication. Currently
3246  * check cert exists, if we have a suitable digest for TLS 1.2 if
3247  * static DH client certificates can be used and optionally checks
3248  * suitability for Suite B.
3249  */
3250 static int ssl3_check_client_certificate(SSL *s)
3251         {
3252         unsigned long alg_k;
3253         if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3254                 return 0;
3255         /* If no suitable signature algorithm can't use certificate */
3256         if (SSL_USE_SIGALGS(s) && !s->cert->key->digest)
3257                 return 0;
3258         /* If strict mode check suitability of chain before using it.
3259          * This also adjusts suite B digest if necessary.
3260          */
3261         if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
3262                 !tls1_check_chain(s, NULL, NULL, NULL, -2))
3263                 return 0;
3264         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3265         /* See if we can use client certificate for fixed DH */
3266         if (alg_k & (SSL_kDHr|SSL_kDHd))
3267                 {
3268                 SESS_CERT *scert = s->session->sess_cert;
3269                 int i = scert->peer_cert_type;
3270                 EVP_PKEY *clkey = NULL, *spkey = NULL;
3271                 clkey = s->cert->key->privatekey;
3272                 /* If client key not DH assume it can be used */
3273                 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3274                         return 1;
3275                 if (i >= 0)
3276                         spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
3277                 if (spkey)
3278                         {
3279                         /* Compare server and client parameters */
3280                         i = EVP_PKEY_cmp_parameters(clkey, spkey);
3281                         EVP_PKEY_free(spkey);
3282                         if (i != 1)
3283                                 return 0;
3284                         }
3285                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3286                 }
3287         return 1;
3288         }
3289
3290 int ssl3_send_client_certificate(SSL *s)
3291         {
3292         X509 *x509=NULL;
3293         EVP_PKEY *pkey=NULL;
3294         int i;
3295
3296         if (s->state == SSL3_ST_CW_CERT_A)
3297                 {
3298                 /* Let cert callback update client certificates if required */
3299                 if (s->cert->cert_cb)
3300                         {
3301                         i = s->cert->cert_cb(s, s->cert->cert_cb_arg);
3302                         if (i < 0)
3303                                 {
3304                                 s->rwstate=SSL_X509_LOOKUP;
3305                                 return -1;
3306                                 }
3307                         if (i == 0)
3308                                 {
3309                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
3310                                 return 0;
3311                                 }
3312                         s->rwstate=SSL_NOTHING;
3313                         }
3314                 if (ssl3_check_client_certificate(s))
3315                         s->state=SSL3_ST_CW_CERT_C;
3316                 else
3317                         s->state=SSL3_ST_CW_CERT_B;
3318                 }
3319
3320         /* We need to get a client cert */
3321         if (s->state == SSL3_ST_CW_CERT_B)
3322                 {
3323                 /* If we get an error, we need to
3324                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3325                  * We then get retied later */
3326                 i=0;
3327                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3328                 if (i < 0)
3329                         {
3330                         s->rwstate=SSL_X509_LOOKUP;
3331                         return(-1);
3332                         }
3333                 s->rwstate=SSL_NOTHING;
3334                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3335                         {
3336                         s->state=SSL3_ST_CW_CERT_B;
3337                         if (    !SSL_use_certificate(s,x509) ||
3338                                 !SSL_use_PrivateKey(s,pkey))
3339                                 i=0;
3340                         }
3341                 else if (i == 1)
3342                         {
3343                         i=0;
3344                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3345                         }
3346
3347                 if (x509 != NULL) X509_free(x509);
3348                 if (pkey != NULL) EVP_PKEY_free(pkey);
3349                 if (i && !ssl3_check_client_certificate(s))
3350                         i = 0;
3351                 if (i == 0)
3352                         {
3353                         if (s->version == SSL3_VERSION)
3354                                 {
3355                                 s->s3->tmp.cert_req=0;
3356                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3357                                 return(1);
3358                                 }
3359                         else
3360                                 {
3361                                 s->s3->tmp.cert_req=2;
3362                                 }
3363                         }
3364
3365                 /* Ok, we have a cert */
3366                 s->state=SSL3_ST_CW_CERT_C;
3367                 }
3368
3369         if (s->state == SSL3_ST_CW_CERT_C)
3370                 {
3371                 s->state=SSL3_ST_CW_CERT_D;
3372                 ssl3_output_cert_chain(s,
3373                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key);
3374                 }
3375         /* SSL3_ST_CW_CERT_D */
3376         return ssl_do_write(s);
3377         }
3378
3379 #define has_bits(i,m)   (((i)&(m)) == (m))
3380
3381 int ssl3_check_cert_and_algorithm(SSL *s)
3382         {
3383         int i,idx;
3384         long alg_k,alg_a;
3385         EVP_PKEY *pkey=NULL;
3386         SESS_CERT *sc;
3387 #ifndef OPENSSL_NO_RSA
3388         RSA *rsa;
3389 #endif
3390 #ifndef OPENSSL_NO_DH
3391         DH *dh;
3392 #endif
3393
3394         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3395         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3396
3397         /* we don't have a certificate */
3398         if ((alg_a & (SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3399                 return(1);
3400
3401         sc=s->session->sess_cert;
3402         if (sc == NULL)
3403                 {
3404                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3405                 goto err;
3406                 }
3407
3408 #ifndef OPENSSL_NO_RSA
3409         rsa=s->session->sess_cert->peer_rsa_tmp;
3410 #endif
3411 #ifndef OPENSSL_NO_DH
3412         dh=s->session->sess_cert->peer_dh_tmp;
3413 #endif
3414
3415         /* This is the passed certificate */
3416
3417         idx=sc->peer_cert_type;
3418 #ifndef OPENSSL_NO_ECDH
3419         if (idx == SSL_PKEY_ECC)
3420                 {
3421                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3422                                                                 s) == 0)
3423                         { /* check failed */
3424                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3425                         goto f_err;
3426                         }
3427                 else
3428                         {
3429                         return 1;
3430                         }
3431                 }
3432         else if (alg_a & SSL_aECDSA)
3433                 {
3434                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDSA_SIGNING_CERT);
3435                 goto f_err;
3436                 }
3437         else if (alg_k & (SSL_kECDHr|SSL_kECDHe))
3438                 {
3439                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDH_CERT);
3440                 goto f_err;
3441                 }
3442 #endif
3443         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3444         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3445         EVP_PKEY_free(pkey);
3446
3447
3448         /* Check that we have a certificate if we require one */
3449         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3450                 {
3451                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3452                 goto f_err;
3453                 }
3454 #ifndef OPENSSL_NO_DSA
3455         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3456                 {
3457                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3458                 goto f_err;
3459                 }
3460 #endif
3461 #ifndef OPENSSL_NO_RSA
3462         if ((alg_k & SSL_kRSA) &&
3463                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3464                 {
3465                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3466                 goto f_err;
3467                 }
3468 #endif
3469 #ifndef OPENSSL_NO_DH
3470         if ((alg_k & SSL_kEDH) &&
3471                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3472                 {
3473                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3474                 goto f_err;
3475                 }
3476         else if ((alg_k & SSL_kDHr) && !SSL_USE_SIGALGS(s) &&
3477                 !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3478                 {
3479                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3480                 goto f_err;
3481                 }
3482 #ifndef OPENSSL_NO_DSA
3483         else if ((alg_k & SSL_kDHd) && !SSL_USE_SIGALGS(s) &&
3484                 !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3485                 {
3486                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3487                 goto f_err;
3488                 }
3489 #endif
3490 #endif
3491
3492         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3493                 {
3494 #ifndef OPENSSL_NO_RSA
3495                 if (alg_k & SSL_kRSA)
3496                         {
3497                         if (rsa == NULL
3498                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3499                                 {
3500                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3501                                 goto f_err;
3502                                 }
3503                         }
3504                 else
3505 #endif
3506 #ifndef OPENSSL_NO_DH
3507                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3508                             {
3509                             if (dh == NULL
3510                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3511                                 {
3512                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3513                                 goto f_err;
3514                                 }
3515                         }
3516                 else
3517 #endif
3518                         {
3519                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3520                         goto f_err;
3521                         }
3522                 }
3523         return(1);
3524 f_err:
3525         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3526 err:
3527         return(0);
3528         }
3529
3530 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
3531 int ssl3_send_next_proto(SSL *s)
3532         {
3533         unsigned int len, padding_len;
3534         unsigned char *d;
3535
3536         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3537                 {
3538                 len = s->next_proto_negotiated_len;
3539                 padding_len = 32 - ((len + 2) % 32);
3540                 d = (unsigned char *)s->init_buf->data;
3541                 d[4] = len;
3542                 memcpy(d + 5, s->next_proto_negotiated, len);
3543                 d[5 + len] = padding_len;
3544                 memset(d + 6 + len, 0, padding_len);
3545                 *(d++)=SSL3_MT_NEXT_PROTO;
3546                 l2n3(2 + len + padding_len, d);
3547                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3548                 s->init_num = 4 + 2 + len + padding_len;
3549                 s->init_off = 0;
3550                 }
3551
3552         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3553 }
3554 #endif  /* !OPENSSL_NO_TLSEXT && !OPENSSL_NO_NEXTPROTONEG */
3555
3556 /* Check to see if handshake is full or resumed. Usually this is just a
3557  * case of checking to see if a cache hit has occurred. In the case of
3558  * session tickets we have to check the next message to be sure.
3559  */
3560
3561 #ifndef OPENSSL_NO_TLSEXT
3562 int ssl3_check_finished(SSL *s)
3563         {
3564         int ok;
3565         long n;
3566
3567         /* If we have no ticket it cannot be a resumed session. */
3568         if (!s->session->tlsext_tick)
3569                 return 1;
3570         /* this function is called when we really expect a Certificate
3571          * message, so permit appropriate message length */
3572         n=s->method->ssl_get_message(s,
3573                 SSL3_ST_CR_CERT_A,
3574                 SSL3_ST_CR_CERT_B,
3575                 -1,
3576                 s->max_cert_list,
3577                 &ok);
3578         if (!ok) return((int)n);
3579         s->s3->tmp.reuse_message = 1;
3580
3581         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
3582                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
3583                 return 2;
3584
3585         return 1;
3586         }
3587 #endif
3588
3589 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3590         {
3591         int i = 0;
3592 #ifndef OPENSSL_NO_ENGINE
3593         if (s->ctx->client_cert_engine)
3594                 {
3595                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3596                                                 SSL_get_client_CA_list(s),
3597                                                 px509, ppkey, NULL, NULL, NULL);
3598                 if (i != 0)
3599                         return i;
3600                 }
3601 #endif
3602         if (s->ctx->client_cert_cb)
3603                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3604         return i;
3605         }
3606