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 int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 171
 172 #ifndef OPENSSL_NO_SSL3_METHOD
 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 #endif
 186
 187 int ssl3_connect(SSL *s)
 188         {
 189         BUF_MEM *buf=NULL;
 190         unsigned long Time=(unsigned long)time(NULL);
 191         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 192         int ret= -1;
 193         int new_state,state,skip=0;
 194
 195         RAND_add(&Time,sizeof(Time),0);
 196         ERR_clear_error();
 197         clear_sys_error();
 198
 199         if (s->info_callback != NULL)
 200                 cb=s->info_callback;
 201         else if (s->ctx->info_callback != NULL)
 202                 cb=s->ctx->info_callback;
 203
 204         s->in_handshake++;
 205         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 206
 207 #ifndef OPENSSL_NO_HEARTBEATS
 208         /* If we're awaiting a HeartbeatResponse, pretend we
 209          * already got and don't await it anymore, because
 210          * Heartbeats don't make sense during handshakes anyway.
 211          */
 212         if (s->tlsext_hb_pending)
 213                 {
 214                 s->tlsext_hb_pending = 0;
 215                 s->tlsext_hb_seq++;
 216                 }
 217 #endif
 218
 219         for (;;)
 220                 {
 221                 state=s->state;
 222
 223                 switch(s->state)
 224                         {
 225                 case SSL_ST_RENEGOTIATE:
 226                         s->renegotiate=1;
 227                         s->state=SSL_ST_CONNECT;
 228                         s->ctx->stats.sess_connect_renegotiate++;
 229                         /* break */
 230                 case SSL_ST_BEFORE:
 231                 case SSL_ST_CONNECT:
 232                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 233                 case SSL_ST_OK|SSL_ST_CONNECT:
 234
 235                         s->server=0;
 236                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 237
 238                         if ((s->version & 0xff00 ) != 0x0300)
 239                                 {
 240                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 241                                 ret = -1;
 242                                 goto end;
 243                                 }
 244
 245                         /* s->version=SSL3_VERSION; */
 246                         s->type=SSL_ST_CONNECT;
 247
 248                         if (s->init_buf == NULL)
 249                                 {
 250                                 if ((buf=BUF_MEM_new()) == NULL)
 251                                         {
 252                                         ret= -1;
 253                                         goto end;
 254                                         }
 255                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 256                                         {
 257                                         ret= -1;
 258                                         goto end;
 259                                         }
 260                                 s->init_buf=buf;
 261                                 buf=NULL;
 262                                 }
 263
 264                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 265
 266                         /* setup buffing BIO */
 267                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 268
 269                         /* don't push the buffering BIO quite yet */
 270
 271                         ssl3_init_finished_mac(s);
 272
 273                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 274                         s->ctx->stats.sess_connect++;
 275                         s->init_num=0;
 276                         break;
 277
 278                 case SSL3_ST_CW_CLNT_HELLO_A:
 279                 case SSL3_ST_CW_CLNT_HELLO_B:
 280
 281                         s->shutdown=0;
 282                         ret=ssl3_client_hello(s);
 283                         if (ret <= 0) goto end;
 284                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 285                         s->init_num=0;
 286
 287                         /* turn on buffering for the next lot of output */
 288                         if (s->bbio != s->wbio)
 289                                 s->wbio=BIO_push(s->bbio,s->wbio);
 290
 291                         break;
 292
 293                 case SSL3_ST_CR_SRVR_HELLO_A:
 294                 case SSL3_ST_CR_SRVR_HELLO_B:
 295                         ret=ssl3_get_server_hello(s);
 296                         if (ret <= 0) goto end;
 297
 298                         if (s->hit)
 299                                 {
 300                                 s->state=SSL3_ST_CR_FINISHED_A;
 301 #ifndef OPENSSL_NO_TLSEXT
 302                                 if (s->tlsext_ticket_expected)
 303                                         {
 304                                         /* receive renewed session ticket */
 305                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 306                                         }
 307 #endif
 308                                 }
 309                         else
 310                                 {
 311                                         s->state=SSL3_ST_CR_CERT_A;
 312                                 }
 313                         s->init_num=0;
 314                         break;
 315                 case SSL3_ST_CR_CERT_A:
 316                 case SSL3_ST_CR_CERT_B:
 317                         /* Check if it is anon DH/ECDH, SRP auth */
 318                         /* or PSK */
 319                         if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL|SSL_aSRP)) &&
 320                             !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK))
 321                                 {
 322                                 ret=ssl3_get_server_certificate(s);
 323                                 if (ret <= 0) goto end;
 324 #ifndef OPENSSL_NO_TLSEXT
 325                                 if (s->tlsext_status_expected)
 326                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 327                                 else
 328                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 329                                 }
 330                         else
 331                                 {
 332                                 skip = 1;
 333                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 334                                 }
 335 #else
 336                                 }
 337                         else
 338                                 skip=1;
 339
 340                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 341 #endif
 342                         s->init_num=0;
 343                         break;
 344
 345                 case SSL3_ST_CR_KEY_EXCH_A:
 346                 case SSL3_ST_CR_KEY_EXCH_B:
 347                         ret=ssl3_get_key_exchange(s);
 348                         if (ret <= 0) goto end;
 349                         s->state=SSL3_ST_CR_CERT_REQ_A;
 350                         s->init_num=0;
 351
 352                         /* at this point we check that we have the
 353                          * required stuff from the server */
 354                         if (!ssl3_check_cert_and_algorithm(s))
 355                                 {
 356                                 ret= -1;
 357                                 goto end;
 358                                 }
 359                         break;
 360
 361                 case SSL3_ST_CR_CERT_REQ_A:
 362                 case SSL3_ST_CR_CERT_REQ_B:
 363                         ret=ssl3_get_certificate_request(s);
 364                         if (ret <= 0) goto end;
 365                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 366                         s->init_num=0;
 367                         break;
 368
 369                 case SSL3_ST_CR_SRVR_DONE_A:
 370                 case SSL3_ST_CR_SRVR_DONE_B:
 371                         ret=ssl3_get_server_done(s);
 372                         if (ret <= 0) goto end;
 373 #ifndef OPENSSL_NO_SRP
 374                         if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP)
 375                                 {
 376                                 if ((ret = SRP_Calc_A_param(s))<=0)
 377                                         {
 378                                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_SRP_A_CALC);
 379                                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
 380                                         goto end;
 381                                         }
 382                                 }
 383 #endif
 384                         if (s->s3->tmp.cert_req)
 385                                 s->state=SSL3_ST_CW_CERT_A;
 386                         else
 387                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 388                         s->init_num=0;
 389
 390                         break;
 391
 392                 case SSL3_ST_CW_CERT_A:
 393                 case SSL3_ST_CW_CERT_B:
 394                 case SSL3_ST_CW_CERT_C:
 395                 case SSL3_ST_CW_CERT_D:
 396                         ret=ssl3_send_client_certificate(s);
 397                         if (ret <= 0) goto end;
 398                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 399                         s->init_num=0;
 400                         break;
 401
 402                 case SSL3_ST_CW_KEY_EXCH_A:
 403                 case SSL3_ST_CW_KEY_EXCH_B:
 404                         ret=ssl3_send_client_key_exchange(s);
 405                         if (ret <= 0) goto end;
 406                         /* EAY EAY EAY need to check for DH fix cert
 407                          * sent back */
 408                         /* For TLS, cert_req is set to 2, so a cert chain
 409                          * of nothing is sent, but no verify packet is sent */
 410                         /* XXX: For now, we do not support client
 411                          * authentication in ECDH cipher suites with
 412                          * ECDH (rather than ECDSA) certificates.
 413                          * We need to skip the certificate verify
 414                          * message when client's ECDH public key is sent
 415                          * inside the client certificate.
 416                          */
 417                         if (s->s3->tmp.cert_req == 1)
 418                                 {
 419                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 420                                 }
 421                         else
 422                                 {
 423                                 s->state=SSL3_ST_CW_CHANGE_A;
 424                                 s->s3->change_cipher_spec=0;
 425                                 }
 426                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
 427                                 {
 428                                 s->state=SSL3_ST_CW_CHANGE_A;
 429                                 s->s3->change_cipher_spec=0;
 430                                 }
 431
 432                         s->init_num=0;
 433                         break;
 434
 435                 case SSL3_ST_CW_CERT_VRFY_A:
 436                 case SSL3_ST_CW_CERT_VRFY_B:
 437                         ret=ssl3_send_client_verify(s);
 438                         if (ret <= 0) goto end;
 439                         s->state=SSL3_ST_CW_CHANGE_A;
 440                         s->init_num=0;
 441                         s->s3->change_cipher_spec=0;
 442                         break;
 443
 444                 case SSL3_ST_CW_CHANGE_A:
 445                 case SSL3_ST_CW_CHANGE_B:
 446                         ret=ssl3_send_change_cipher_spec(s,
 447                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 448                         if (ret <= 0) goto end;
 449
 450 #if defined(OPENSSL_NO_TLSEXT) || defined(OPENSSL_NO_NEXTPROTONEG)
 451                         s->state=SSL3_ST_CW_FINISHED_A;
 452 #else
 453                         if (s->s3->next_proto_neg_seen)
 454                                 s->state=SSL3_ST_CW_NEXT_PROTO_A;
 455                         else
 456                                 s->state=SSL3_ST_CW_FINISHED_A;
 457 #endif
 458                         s->init_num=0;
 459
 460                         s->session->cipher=s->s3->tmp.new_cipher;
 461 #ifdef OPENSSL_NO_COMP
 462                         s->session->compress_meth=0;
 463 #else
 464                         if (s->s3->tmp.new_compression == NULL)
 465                                 s->session->compress_meth=0;
 466                         else
 467                                 s->session->compress_meth=
 468                                         s->s3->tmp.new_compression->id;
 469 #endif
 470                         if (!s->method->ssl3_enc->setup_key_block(s))
 471                                 {
 472                                 ret= -1;
 473                                 goto end;
 474                                 }
 475
 476                         if (!s->method->ssl3_enc->change_cipher_state(s,
 477                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 478                                 {
 479                                 ret= -1;
 480                                 goto end;
 481                                 }
 482
 483                         break;
 484
 485 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
 486                 case SSL3_ST_CW_NEXT_PROTO_A:
 487                 case SSL3_ST_CW_NEXT_PROTO_B:
 488                         ret=ssl3_send_next_proto(s);
 489                         if (ret <= 0) goto end;
 490                         s->state=SSL3_ST_CW_FINISHED_A;
 491                         break;
 492 #endif
 493
 494                 case SSL3_ST_CW_FINISHED_A:
 495                 case SSL3_ST_CW_FINISHED_B:
 496                         ret=ssl3_send_finished(s,
 497                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 498                                 s->method->ssl3_enc->client_finished_label,
 499                                 s->method->ssl3_enc->client_finished_label_len);
 500                         if (ret <= 0) goto end;
 501                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 502                         s->state=SSL3_ST_CW_FLUSH;
 503
 504                         /* clear flags */
 505                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 506                         if (s->hit)
 507                                 {
 508                                 s->s3->tmp.next_state=SSL_ST_OK;
 509                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 510                                         {
 511                                         s->state=SSL_ST_OK;
 512                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 513                                         s->s3->delay_buf_pop_ret=0;
 514                                         }
 515                                 }
 516                         else
 517                                 {
 518 #ifndef OPENSSL_NO_TLSEXT
 519                                 /* Allow NewSessionTicket if ticket expected */
 520                                 if (s->tlsext_ticket_expected)
 521                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 522                                 else
 523 #endif
 524
 525                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 526                                 }
 527                         s->init_num=0;
 528                         break;
 529
 530 #ifndef OPENSSL_NO_TLSEXT
 531                 case SSL3_ST_CR_SESSION_TICKET_A:
 532                 case SSL3_ST_CR_SESSION_TICKET_B:
 533                         ret=ssl3_get_new_session_ticket(s);
 534                         if (ret <= 0) goto end;
 535                         s->state=SSL3_ST_CR_FINISHED_A;
 536                         s->init_num=0;
 537                 break;
 538
 539                 case SSL3_ST_CR_CERT_STATUS_A:
 540                 case SSL3_ST_CR_CERT_STATUS_B:
 541                         ret=ssl3_get_cert_status(s);
 542                         if (ret <= 0) goto end;
 543                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 544                         s->init_num=0;
 545                 break;
 546 #endif
 547
 548                 case SSL3_ST_CR_FINISHED_A:
 549                 case SSL3_ST_CR_FINISHED_B:
 550
 551                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 552                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 553                                 SSL3_ST_CR_FINISHED_B);
 554                         if (ret <= 0) goto end;
 555
 556                         if (s->hit)
 557                                 s->state=SSL3_ST_CW_CHANGE_A;
 558                         else
 559                                 s->state=SSL_ST_OK;
 560                         s->init_num=0;
 561                         break;
 562
 563                 case SSL3_ST_CW_FLUSH:
 564                         s->rwstate=SSL_WRITING;
 565                         if (BIO_flush(s->wbio) <= 0)
 566                                 {
 567                                 ret= -1;
 568                                 goto end;
 569                                 }
 570                         s->rwstate=SSL_NOTHING;
 571                         s->state=s->s3->tmp.next_state;
 572                         break;
 573
 574                 case SSL_ST_OK:
 575                         /* clean a few things up */
 576                         ssl3_cleanup_key_block(s);
 577
 578                         if (s->init_buf != NULL)
 579                                 {
 580                                 BUF_MEM_free(s->init_buf);
 581                                 s->init_buf=NULL;
 582                                 }
 583
 584                         /* If we are not 'joining' the last two packets,
 585                          * remove the buffering now */
 586                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 587                                 ssl_free_wbio_buffer(s);
 588                         /* else do it later in ssl3_write */
 589
 590                         s->init_num=0;
 591                         s->renegotiate=0;
 592                         s->new_session=0;
 593
 594                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 595                         if (s->hit) s->ctx->stats.sess_hit++;
 596
 597                         ret=1;
 598                         /* s->server=0; */
 599                         s->handshake_func=ssl3_connect;
 600                         s->ctx->stats.sess_connect_good++;
 601
 602                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 603
 604                         goto end;
 605                         /* break; */
 606
 607                 default:
 608                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 609                         ret= -1;
 610                         goto end;
 611                         /* break; */
 612                         }
 613
 614                 /* did we do anything */
 615                 if (!s->s3->tmp.reuse_message && !skip)
 616                         {
 617                         if (s->debug)
 618                                 {
 619                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 620                                         goto end;
 621                                 }
 622
 623                         if ((cb != NULL) && (s->state != state))
 624                                 {
 625                                 new_state=s->state;
 626                                 s->state=state;
 627                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 628                                 s->state=new_state;
 629                                 }
 630                         }
 631                 skip=0;
 632                 }
 633 end:
 634         s->in_handshake--;
 635         if (buf != NULL)
 636                 BUF_MEM_free(buf);
 637         if (cb != NULL)
 638                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 639         return(ret);
 640         }
 641
 642
 643 int ssl3_client_hello(SSL *s)
 644         {
 645         unsigned char *buf;
 646         unsigned char *p,*d;
 647         int i;
 648         unsigned long l;
 649         int al = 0;
 650 #ifndef OPENSSL_NO_COMP
 651         int j;
 652         SSL_COMP *comp;
 653 #endif
 654
 655         buf=(unsigned char *)s->init_buf->data;
 656         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 657                 {
 658                 SSL_SESSION *sess = s->session;
 659                 if ((sess == NULL) ||
 660                         (sess->ssl_version != s->version) ||
 661                         !sess->session_id_length ||
 662                         (sess->not_resumable))
 663                         {
 664                         if (!ssl_get_new_session(s,0))
 665                                 goto err;
 666                         }
 667                 if (s->method->version == DTLS_ANY_VERSION)
 668                         {
 669                         /* Determine which DTLS version to use */
 670                         int options = s->options;
 671                         /* If DTLS 1.2 disabled correct the version number */
 672                         if (options & SSL_OP_NO_DTLSv1_2)
 673                                 {
 674                                 if (tls1_suiteb(s))
 675                                         {
 676                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
 677                                         goto err;
 678                                         }
 679                                 /* Disabling all versions is silly: return an
 680                                  * error.
 681                                  */
 682                                 if (options & SSL_OP_NO_DTLSv1)
 683                                         {
 684                                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_WRONG_SSL_VERSION);
 685                                         goto err;
 686                                         }
 687                                 /* Update method so we don't use any DTLS 1.2
 688                                  * features.
 689                                  */
 690                                 s->method = DTLSv1_client_method();
 691                                 s->version = DTLS1_VERSION;
 692                                 }
 693                         else
 694                                 {
 695                                 /* We only support one version: update method */
 696                                 if (options & SSL_OP_NO_DTLSv1)
 697                                         s->method = DTLSv1_2_client_method();
 698                                 s->version = DTLS1_2_VERSION;
 699                                 }
 700                         s->client_version = s->version;
 701                         }
 702                 /* else use the pre-loaded session */
 703
 704                 p=s->s3->client_random;
 705
 706                 /* for DTLS if client_random is initialized, reuse it, we are
 707                  * required to use same upon reply to HelloVerify */
 708                 if (SSL_IS_DTLS(s))
 709                         {
 710                         size_t idx;
 711                         i = 1;
 712                         for (idx=0; idx < sizeof(s->s3->client_random); idx++)
 713                                 {
 714                                 if (p[idx])
 715                                         {
 716                                         i = 0;
 717                                         break;
 718                                         }
 719                                 }
 720                         }
 721                 else
 722                         i = 1;
 723
 724                 if (i)
 725                         ssl_fill_hello_random(s, 0, p,
 726                                               sizeof(s->s3->client_random));
 727
 728                 /* Do the message type and length last */
 729                 d=p= ssl_handshake_start(s);
 730
 731                 /* version indicates the negotiated version: for example from
 732                  * an SSLv2/v3 compatible client hello). The client_version
 733                  * field is the maximum version we permit and it is also
 734                  * used in RSA encrypted premaster secrets. Some servers can
 735                  * choke if we initially report a higher version then
 736                  * renegotiate to a lower one in the premaster secret. This
 737                  * didn't happen with TLS 1.0 as most servers supported it
 738                  * but it can with TLS 1.1 or later if the server only supports
 739                  * 1.0.
 740                  *
 741                  * Possible scenario with previous logic:
 742                  *      1. Client hello indicates TLS 1.2
 743                  *      2. Server hello says TLS 1.0
 744                  *      3. RSA encrypted premaster secret uses 1.2.
 745                  *      4. Handhaked proceeds using TLS 1.0.
 746                  *      5. Server sends hello request to renegotiate.
 747                  *      6. Client hello indicates TLS v1.0 as we now
 748                  *         know that is maximum server supports.
 749                  *      7. Server chokes on RSA encrypted premaster secret
 750                  *         containing version 1.0.
 751                  *
 752                  * For interoperability it should be OK to always use the
 753                  * maximum version we support in client hello and then rely
 754                  * on the checking of version to ensure the servers isn't
 755                  * being inconsistent: for example initially negotiating with
 756                  * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
 757                  * client_version in client hello and not resetting it to
 758                  * the negotiated version.
 759                  */
 760 #if 0
 761                 *(p++)=s->version>>8;
 762                 *(p++)=s->version&0xff;
 763                 s->client_version=s->version;
 764 #else
 765                 *(p++)=s->client_version>>8;
 766                 *(p++)=s->client_version&0xff;
 767 #endif
 768
 769                 /* Random stuff */
 770                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 771                 p+=SSL3_RANDOM_SIZE;
 772
 773                 /* Session ID */
 774                 if (s->new_session)
 775                         i=0;
 776                 else
 777                         i=s->session->session_id_length;
 778                 *(p++)=i;
 779                 if (i != 0)
 780                         {
 781                         if (i > (int)sizeof(s->session->session_id))
 782                                 {
 783                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 784                                 goto err;
 785                                 }
 786                         memcpy(p,s->session->session_id,i);
 787                         p+=i;
 788                         }
 789
 790                 /* cookie stuff for DTLS */
 791                 if (SSL_IS_DTLS(s))
 792                         {
 793                         if ( s->d1->cookie_len > sizeof(s->d1->cookie))
 794                                 {
 795                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 796                                 goto err;
 797                                 }
 798                         *(p++) = s->d1->cookie_len;
 799                         memcpy(p, s->d1->cookie, s->d1->cookie_len);
 800                         p += s->d1->cookie_len;
 801                         }
 802
 803                 /* Ciphers supported */
 804                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 805                 if (i == 0)
 806                         {
 807                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 808                         goto err;
 809                         }
 810 #ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
 811                         /* Some servers hang if client hello > 256 bytes
 812                          * as hack workaround chop number of supported ciphers
 813                          * to keep it well below this if we use TLS v1.2
 814                          */
 815                         if (TLS1_get_version(s) >= TLS1_2_VERSION
 816                                 && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
 817                                 i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
 818 #endif
 819                 s2n(i,p);
 820                 p+=i;
 821
 822                 /* COMPRESSION */
 823 #ifdef OPENSSL_NO_COMP
 824                 *(p++)=1;
 825 #else
 826
 827                 if ((s->options & SSL_OP_NO_COMPRESSION)
 828                                         || !s->ctx->comp_methods)
 829                         j=0;
 830                 else
 831                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 832                 *(p++)=1+j;
 833                 for (i=0; i<j; i++)
 834                         {
 835                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 836                         *(p++)=comp->id;
 837                         }
 838 #endif
 839                 *(p++)=0; /* Add the NULL method */
 840
 841 #ifndef OPENSSL_NO_TLSEXT
 842                 /* TLS extensions*/
 843                 if (ssl_prepare_clienthello_tlsext(s) <= 0)
 844                         {
 845                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_CLIENTHELLO_TLSEXT);
 846                         goto err;
 847                         }
 848                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH, &al)) == NULL)
 849                         {
 850                         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 851                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 852                         goto err;
 853                         }
 854 #endif
 855
 856                 l= p-d;
 857                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l);
 858                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 859                 }
 860
 861         /* SSL3_ST_CW_CLNT_HELLO_B */
 862         return ssl_do_write(s);
 863 err:
 864         return(-1);
 865         }
 866
 867 int ssl3_get_server_hello(SSL *s)
 868         {
 869         STACK_OF(SSL_CIPHER) *sk;
 870         const SSL_CIPHER *c;
 871         CERT *ct = s->cert;
 872         unsigned char *p,*d;
 873         int i,al=SSL_AD_INTERNAL_ERROR,ok;
 874         unsigned int j;
 875         long n;
 876 #ifndef OPENSSL_NO_COMP
 877         SSL_COMP *comp;
 878 #endif
 879         /* Hello verify request and/or server hello version may not
 880          * match so set first packet if we're negotiating version.
 881          */
 882         if (SSL_IS_DTLS(s))
 883                 s->first_packet = 1;
 884
 885         n=s->method->ssl_get_message(s,
 886                 SSL3_ST_CR_SRVR_HELLO_A,
 887                 SSL3_ST_CR_SRVR_HELLO_B,
 888                 -1,
 889                 20000, /* ?? */
 890                 &ok);
 891
 892         if (!ok) return((int)n);
 893
 894         if (SSL_IS_DTLS(s))
 895                 {
 896                 s->first_packet = 0;
 897                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 898                         {
 899                         if ( s->d1->send_cookie == 0)
 900                                 {
 901                                 s->s3->tmp.reuse_message = 1;
 902                                 return 1;
 903                                 }
 904                         else /* already sent a cookie */
 905                                 {
 906                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 907                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 908                                 goto f_err;
 909                                 }
 910                         }
 911                 }
 912
 913         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 914                 {
 915                 al=SSL_AD_UNEXPECTED_MESSAGE;
 916                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 917                 goto f_err;
 918                 }
 919
 920         d=p=(unsigned char *)s->init_msg;
 921         if (s->method->version == DTLS_ANY_VERSION)
 922                 {
 923                 /* Work out correct protocol version to use */
 924                 int hversion = (p[0] << 8)|p[1];
 925                 int options = s->options;
 926                 if (hversion == DTLS1_2_VERSION
 927                         && !(options & SSL_OP_NO_DTLSv1_2))
 928                         s->method = DTLSv1_2_client_method();
 929                 else if (tls1_suiteb(s))
 930                         {
 931                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO, SSL_R_ONLY_DTLS_1_2_ALLOWED_IN_SUITEB_MODE);
 932                         s->version = hversion;
 933                         al = SSL_AD_PROTOCOL_VERSION;
 934                         goto f_err;
 935                         }
 936                 else if (hversion == DTLS1_VERSION
 937                         && !(options & SSL_OP_NO_DTLSv1))
 938                         s->method = DTLSv1_client_method();
 939                 else
 940                         {
 941                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 942                         s->version = hversion;
 943                         al = SSL_AD_PROTOCOL_VERSION;
 944                         goto f_err;
 945                         }
 946                 s->version = s->client_version = s->method->version;
 947                 }
 948
 949         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 950                 {
 951                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 952                 s->version=(s->version&0xff00)|p[1];
 953                 al=SSL_AD_PROTOCOL_VERSION;
 954                 goto f_err;
 955                 }
 956         p+=2;
 957
 958         /* load the server hello data */
 959         /* load the server random */
 960         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 961         p+=SSL3_RANDOM_SIZE;
 962
 963         s->hit = 0;
 964
 965         /* get the session-id */
 966         j= *(p++);
 967
 968         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 969                 {
 970                 al=SSL_AD_ILLEGAL_PARAMETER;
 971                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 972                 goto f_err;
 973                 }
 974
 975 #ifndef OPENSSL_NO_TLSEXT
 976         /* check if we want to resume the session based on external pre-shared secret */
 977         if (s->version >= TLS1_VERSION && s->tls_session_secret_cb)
 978                 {
 979                 SSL_CIPHER *pref_cipher=NULL;
 980                 s->session->master_key_length=sizeof(s->session->master_key);
 981                 if (s->tls_session_secret_cb(s, s->session->master_key,
 982                                              &s->session->master_key_length,
 983                                              NULL, &pref_cipher,
 984                                              s->tls_session_secret_cb_arg))
 985                         {
 986                         s->session->cipher = pref_cipher ?
 987                                 pref_cipher : ssl_get_cipher_by_char(s, p+j);
 988                         s->hit = 1;
 989                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 990                         }
 991                 }
 992 #endif /* OPENSSL_NO_TLSEXT */
 993
 994         if (!s->hit && j != 0 && j == s->session->session_id_length
 995             && memcmp(p,s->session->session_id,j) == 0)
 996             {
 997             if(s->sid_ctx_length != s->session->sid_ctx_length
 998                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 999                 {
1000                 /* actually a client application bug */
1001                 al=SSL_AD_ILLEGAL_PARAMETER;
1002                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
1003                 goto f_err;
1004                 }
1005             s->s3->flags |= SSL3_FLAGS_CCS_OK;
1006             s->hit=1;
1007             }
1008         /* a miss or crap from the other end */
1009         if (!s->hit)
1010                 {
1011                 /* If we were trying for session-id reuse, make a new
1012                  * SSL_SESSION so we don't stuff up other people */
1013                 if (s->session->session_id_length > 0)
1014                         {
1015                         if (!ssl_get_new_session(s,0))
1016                                 {
1017                                 goto f_err;
1018                                 }
1019                         }
1020                 s->session->session_id_length=j;
1021                 memcpy(s->session->session_id,p,j); /* j could be 0 */
1022                 }
1023         p+=j;
1024         c=ssl_get_cipher_by_char(s,p);
1025         if (c == NULL)
1026                 {
1027                 /* unknown cipher */
1028                 al=SSL_AD_ILLEGAL_PARAMETER;
1029                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
1030                 goto f_err;
1031                 }
1032         /* If it is a disabled cipher we didn't send it in client hello,
1033          * so return an error.
1034          */
1035         if (c->algorithm_ssl & ct->mask_ssl ||
1036                 c->algorithm_mkey & ct->mask_k ||
1037                 c->algorithm_auth & ct->mask_a)
1038                 {
1039                 al=SSL_AD_ILLEGAL_PARAMETER;
1040                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1041                 goto f_err;
1042                 }
1043         p+=ssl_put_cipher_by_char(s,NULL,NULL);
1044
1045         sk=ssl_get_ciphers_by_id(s);
1046         i=sk_SSL_CIPHER_find(sk,c);
1047         if (i < 0)
1048                 {
1049                 /* we did not say we would use this cipher */
1050                 al=SSL_AD_ILLEGAL_PARAMETER;
1051                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
1052                 goto f_err;
1053                 }
1054
1055         /* Depending on the session caching (internal/external), the cipher
1056            and/or cipher_id values may not be set. Make sure that
1057            cipher_id is set and use it for comparison. */
1058         if (s->session->cipher)
1059                 s->session->cipher_id = s->session->cipher->id;
1060         if (s->hit && (s->session->cipher_id != c->id))
1061                 {
1062 /* Workaround is now obsolete */
1063 #if 0
1064                 if (!(s->options &
1065                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
1066 #endif
1067                         {
1068                         al=SSL_AD_ILLEGAL_PARAMETER;
1069                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
1070                         goto f_err;
1071                         }
1072                 }
1073         s->s3->tmp.new_cipher=c;
1074         /* Don't digest cached records if no sigalgs: we may need them for
1075          * client authentication.
1076          */
1077         if (!SSL_USE_SIGALGS(s) && !ssl3_digest_cached_records(s))
1078                 goto f_err;
1079         /* lets get the compression algorithm */
1080         /* COMPRESSION */
1081 #ifdef OPENSSL_NO_COMP
1082         if (*(p++) != 0)
1083                 {
1084                 al=SSL_AD_ILLEGAL_PARAMETER;
1085                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1086                 goto f_err;
1087                 }
1088         /* If compression is disabled we'd better not try to resume a session
1089          * using compression.
1090          */
1091         if (s->session->compress_meth != 0)
1092                 {
1093                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_INCONSISTENT_COMPRESSION);
1094                 goto f_err;
1095                 }
1096 #else
1097         j= *(p++);
1098         if (s->hit && j != s->session->compress_meth)
1099                 {
1100                 al=SSL_AD_ILLEGAL_PARAMETER;
1101                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
1102                 goto f_err;
1103                 }
1104         if (j == 0)
1105                 comp=NULL;
1106         else if (s->options & SSL_OP_NO_COMPRESSION)
1107                 {
1108                 al=SSL_AD_ILLEGAL_PARAMETER;
1109                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_COMPRESSION_DISABLED);
1110                 goto f_err;
1111                 }
1112         else
1113                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
1114
1115         if ((j != 0) && (comp == NULL))
1116                 {
1117                 al=SSL_AD_ILLEGAL_PARAMETER;
1118                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
1119                 goto f_err;
1120                 }
1121         else
1122                 {
1123                 s->s3->tmp.new_compression=comp;
1124                 }
1125 #endif
1126
1127 #ifndef OPENSSL_NO_TLSEXT
1128         /* TLS extensions*/
1129         if (!ssl_parse_serverhello_tlsext(s,&p,d,n))
1130                 {
1131                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
1132                 goto err;
1133                 }
1134 #endif
1135
1136         if (p != (d+n))
1137                 {
1138                 /* wrong packet length */
1139                 al=SSL_AD_DECODE_ERROR;
1140                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
1141                 goto f_err;
1142                 }
1143
1144         return(1);
1145 f_err:
1146         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1147 err:
1148         return(-1);
1149         }
1150
1151 int ssl3_get_server_certificate(SSL *s)
1152         {
1153         int al,i,ok,ret= -1;
1154         unsigned long n,nc,llen,l;
1155         X509 *x=NULL;
1156         const unsigned char *q,*p;
1157         unsigned char *d;
1158         STACK_OF(X509) *sk=NULL;
1159         SESS_CERT *sc;
1160         EVP_PKEY *pkey=NULL;
1161         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
1162
1163         n=s->method->ssl_get_message(s,
1164                 SSL3_ST_CR_CERT_A,
1165                 SSL3_ST_CR_CERT_B,
1166                 -1,
1167                 s->max_cert_list,
1168                 &ok);
1169
1170         if (!ok) return((int)n);
1171
1172         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
1173                 ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5) &&
1174                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
1175                 {
1176                 s->s3->tmp.reuse_message=1;
1177                 return(1);
1178                 }
1179
1180         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
1181                 {
1182                 al=SSL_AD_UNEXPECTED_MESSAGE;
1183                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
1184                 goto f_err;
1185                 }
1186         p=d=(unsigned char *)s->init_msg;
1187
1188         if ((sk=sk_X509_new_null()) == NULL)
1189                 {
1190                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1191                 goto err;
1192                 }
1193
1194         n2l3(p,llen);
1195         if (llen+3 != n)
1196                 {
1197                 al=SSL_AD_DECODE_ERROR;
1198                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
1199                 goto f_err;
1200                 }
1201         for (nc=0; nc<llen; )
1202                 {
1203                 n2l3(p,l);
1204                 if ((l+nc+3) > llen)
1205                         {
1206                         al=SSL_AD_DECODE_ERROR;
1207                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1208                         goto f_err;
1209                         }
1210
1211                 q=p;
1212                 x=d2i_X509(NULL,&q,l);
1213                 if (x == NULL)
1214                         {
1215                         al=SSL_AD_BAD_CERTIFICATE;
1216                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
1217                         goto f_err;
1218                         }
1219                 if (q != (p+l))
1220                         {
1221                         al=SSL_AD_DECODE_ERROR;
1222                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
1223                         goto f_err;
1224                         }
1225                 if (!sk_X509_push(sk,x))
1226                         {
1227                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
1228                         goto err;
1229                         }
1230                 x=NULL;
1231                 nc+=l+3;
1232                 p=q;
1233                 }
1234
1235         i=ssl_verify_cert_chain(s,sk);
1236         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
1237 #ifndef OPENSSL_NO_KRB5
1238             && !((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1239                  (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1240 #endif /* OPENSSL_NO_KRB5 */
1241                 )
1242                 {
1243                 al=ssl_verify_alarm_type(s->verify_result);
1244                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
1245                 goto f_err;
1246                 }
1247         ERR_clear_error(); /* but we keep s->verify_result */
1248
1249         sc=ssl_sess_cert_new();
1250         if (sc == NULL) goto err;
1251
1252         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1253         s->session->sess_cert=sc;
1254
1255         sc->cert_chain=sk;
1256         /* Inconsistency alert: cert_chain does include the peer's
1257          * certificate, which we don't include in s3_srvr.c */
1258         x=sk_X509_value(sk,0);
1259         sk=NULL;
1260         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1261
1262         pkey=X509_get_pubkey(x);
1263
1264         /* VRS: allow null cert if auth == KRB5 */
1265         need_cert = ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kKRB5) &&
1266                     (s->s3->tmp.new_cipher->algorithm_auth & SSL_aKRB5))
1267                     ? 0 : 1;
1268
1269 #ifdef KSSL_DEBUG
1270         printf("pkey,x = %p, %p\n", pkey,x);
1271         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1272         printf("cipher, alg, nc = %s, %lx, %lx, %d\n", s->s3->tmp.new_cipher->name,
1273                 s->s3->tmp.new_cipher->algorithm_mkey, s->s3->tmp.new_cipher->algorithm_auth, need_cert);
1274 #endif    /* KSSL_DEBUG */
1275
1276         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1277                 {
1278                 x=NULL;
1279                 al=SSL3_AL_FATAL;
1280                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1281                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1282                 goto f_err;
1283                 }
1284
1285         i=ssl_cert_type(x,pkey);
1286         if (need_cert && i < 0)
1287                 {
1288                 x=NULL;
1289                 al=SSL3_AL_FATAL;
1290                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1291                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1292                 goto f_err;
1293                 }
1294
1295         if (need_cert)
1296                 {
1297                 int exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
1298                 if (exp_idx >= 0 && i != exp_idx)
1299                         {
1300                         x=NULL;
1301                         al=SSL_AD_ILLEGAL_PARAMETER;
1302                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1303                                 SSL_R_WRONG_CERTIFICATE_TYPE);
1304                         goto f_err;
1305                         }
1306                 sc->peer_cert_type=i;
1307                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1308                 /* Why would the following ever happen?
1309                  * We just created sc a couple of lines ago. */
1310                 if (sc->peer_pkeys[i].x509 != NULL)
1311                         X509_free(sc->peer_pkeys[i].x509);
1312                 sc->peer_pkeys[i].x509=x;
1313                 sc->peer_key= &(sc->peer_pkeys[i]);
1314
1315                 if (s->session->peer != NULL)
1316                         X509_free(s->session->peer);
1317                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1318                 s->session->peer=x;
1319                 }
1320         else
1321                 {
1322                 sc->peer_cert_type=i;
1323                 sc->peer_key= NULL;
1324
1325                 if (s->session->peer != NULL)
1326                         X509_free(s->session->peer);
1327                 s->session->peer=NULL;
1328                 }
1329         s->session->verify_result = s->verify_result;
1330
1331         x=NULL;
1332         ret=1;
1333         if (0)
1334                 {
1335 f_err:
1336                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1337                 }
1338 err:
1339         EVP_PKEY_free(pkey);
1340         X509_free(x);
1341         sk_X509_pop_free(sk,X509_free);
1342         return(ret);
1343         }
1344
1345 int ssl3_get_key_exchange(SSL *s)
1346         {
1347 #ifndef OPENSSL_NO_RSA
1348         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1349 #endif
1350         EVP_MD_CTX md_ctx;
1351         unsigned char *param,*p;
1352         int al,j,ok;
1353         long i,param_len,n,alg_k,alg_a;
1354         EVP_PKEY *pkey=NULL;
1355         const EVP_MD *md = NULL;
1356 #ifndef OPENSSL_NO_RSA
1357         RSA *rsa=NULL;
1358 #endif
1359 #ifndef OPENSSL_NO_DH
1360         DH *dh=NULL;
1361 #endif
1362 #ifndef OPENSSL_NO_ECDH
1363         EC_KEY *ecdh = NULL;
1364         BN_CTX *bn_ctx = NULL;
1365         EC_POINT *srvr_ecpoint = NULL;
1366         int curve_nid = 0;
1367         int encoded_pt_len = 0;
1368 #endif
1369
1370         /* use same message size as in ssl3_get_certificate_request()
1371          * as ServerKeyExchange message may be skipped */
1372         n=s->method->ssl_get_message(s,
1373                 SSL3_ST_CR_KEY_EXCH_A,
1374                 SSL3_ST_CR_KEY_EXCH_B,
1375                 -1,
1376                 s->max_cert_list,
1377                 &ok);
1378         if (!ok) return((int)n);
1379
1380         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1381                 {
1382 #ifndef OPENSSL_NO_PSK
1383                 /* In plain PSK ciphersuite, ServerKeyExchange can be
1384                    omitted if no identity hint is sent. Set
1385                    session->sess_cert anyway to avoid problems
1386                    later.*/
1387                 if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)
1388                         {
1389                         s->session->sess_cert=ssl_sess_cert_new();
1390                         if (s->ctx->psk_identity_hint)
1391                                 OPENSSL_free(s->ctx->psk_identity_hint);
1392                         s->ctx->psk_identity_hint = NULL;
1393                         }
1394 #endif
1395                 s->s3->tmp.reuse_message=1;
1396                 return(1);
1397                 }
1398
1399         param=p=(unsigned char *)s->init_msg;
1400         if (s->session->sess_cert != NULL)
1401                 {
1402 #ifndef OPENSSL_NO_RSA
1403                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1404                         {
1405                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1406                         s->session->sess_cert->peer_rsa_tmp=NULL;
1407                         }
1408 #endif
1409 #ifndef OPENSSL_NO_DH
1410                 if (s->session->sess_cert->peer_dh_tmp)
1411                         {
1412                         DH_free(s->session->sess_cert->peer_dh_tmp);
1413                         s->session->sess_cert->peer_dh_tmp=NULL;
1414                         }
1415 #endif
1416 #ifndef OPENSSL_NO_ECDH
1417                 if (s->session->sess_cert->peer_ecdh_tmp)
1418                         {
1419                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1420                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1421                         }
1422 #endif
1423                 }
1424         else
1425                 {
1426                 s->session->sess_cert=ssl_sess_cert_new();
1427                 }
1428
1429         /* Total length of the parameters including the length prefix */
1430         param_len=0;
1431
1432         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
1433         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
1434         EVP_MD_CTX_init(&md_ctx);
1435
1436         al=SSL_AD_DECODE_ERROR;
1437
1438 #ifndef OPENSSL_NO_PSK
1439         if (alg_k & SSL_kPSK)
1440                 {
1441                 char tmp_id_hint[PSK_MAX_IDENTITY_LEN+1];
1442
1443                 param_len = 2;
1444                 if (param_len > n)
1445                         {
1446                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1447                                 SSL_R_LENGTH_TOO_SHORT);
1448                         goto f_err;
1449                         }
1450                 n2s(p,i);
1451
1452                 /* Store PSK identity hint for later use, hint is used
1453                  * in ssl3_send_client_key_exchange.  Assume that the
1454                  * maximum length of a PSK identity hint can be as
1455                  * long as the maximum length of a PSK identity. */
1456                 if (i > PSK_MAX_IDENTITY_LEN)
1457                         {
1458                         al=SSL_AD_HANDSHAKE_FAILURE;
1459                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1460                                 SSL_R_DATA_LENGTH_TOO_LONG);
1461                         goto f_err;
1462                         }
1463                 if (i > n - param_len)
1464                         {
1465                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1466                                 SSL_R_BAD_PSK_IDENTITY_HINT_LENGTH);
1467                         goto f_err;
1468                         }
1469                 param_len += i;
1470
1471                 /* If received PSK identity hint contains NULL
1472                  * characters, the hint is truncated from the first
1473                  * NULL. p may not be ending with NULL, so create a
1474                  * NULL-terminated string. */
1475                 memcpy(tmp_id_hint, p, i);
1476                 memset(tmp_id_hint+i, 0, PSK_MAX_IDENTITY_LEN+1-i);
1477                 if (s->ctx->psk_identity_hint != NULL)
1478                         OPENSSL_free(s->ctx->psk_identity_hint);
1479                 s->ctx->psk_identity_hint = BUF_strdup(tmp_id_hint);
1480                 if (s->ctx->psk_identity_hint == NULL)
1481                         {
1482                         al=SSL_AD_HANDSHAKE_FAILURE;
1483                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
1484                         goto f_err;
1485                         }
1486
1487                 p+=i;
1488                 n-=param_len;
1489                 }
1490         else
1491 #endif /* !OPENSSL_NO_PSK */
1492 #ifndef OPENSSL_NO_SRP
1493         if (alg_k & SSL_kSRP)
1494                 {
1495                 param_len = 2;
1496                 if (param_len > n)
1497                         {
1498                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1499                                 SSL_R_LENGTH_TOO_SHORT);
1500                         goto f_err;
1501                         }
1502                 n2s(p,i);
1503
1504                 if (i > n - param_len)
1505                         {
1506                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_N_LENGTH);
1507                         goto f_err;
1508                         }
1509                 param_len += i;
1510
1511                 if (!(s->srp_ctx.N=BN_bin2bn(p,i,NULL)))
1512                         {
1513                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1514                         goto err;
1515                         }
1516                 p+=i;
1517
1518
1519                 if (2 > n - param_len)
1520                         {
1521                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1522                                 SSL_R_LENGTH_TOO_SHORT);
1523                         goto f_err;
1524                         }
1525                 param_len += 2;
1526
1527                 n2s(p,i);
1528
1529                 if (i > n - param_len)
1530                         {
1531                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_G_LENGTH);
1532                         goto f_err;
1533                         }
1534                 param_len += i;
1535
1536                 if (!(s->srp_ctx.g=BN_bin2bn(p,i,NULL)))
1537                         {
1538                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1539                         goto err;
1540                         }
1541                 p+=i;
1542
1543
1544                 if (1 > n - param_len)
1545                         {
1546                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1547                                 SSL_R_LENGTH_TOO_SHORT);
1548                         goto f_err;
1549                         }
1550                 param_len += 1;
1551
1552                 i = (unsigned int)(p[0]);
1553                 p++;
1554
1555                 if (i > n - param_len)
1556                         {
1557                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_S_LENGTH);
1558                         goto f_err;
1559                         }
1560                 param_len += i;
1561
1562                 if (!(s->srp_ctx.s=BN_bin2bn(p,i,NULL)))
1563                         {
1564                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1565                         goto err;
1566                         }
1567                 p+=i;
1568
1569                 if (2 > n - param_len)
1570                         {
1571                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1572                                 SSL_R_LENGTH_TOO_SHORT);
1573                         goto f_err;
1574                         }
1575                 param_len += 2;
1576
1577                 n2s(p,i);
1578
1579                 if (i > n - param_len)
1580                         {
1581                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_B_LENGTH);
1582                         goto f_err;
1583                         }
1584                 param_len += i;
1585
1586                 if (!(s->srp_ctx.B=BN_bin2bn(p,i,NULL)))
1587                         {
1588                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1589                         goto err;
1590                         }
1591                 p+=i;
1592                 n-=param_len;
1593
1594                 if (!srp_verify_server_param(s, &al))
1595                         {
1596                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SRP_PARAMETERS);
1597                         goto f_err;
1598                         }
1599
1600 /* We must check if there is a certificate */
1601 #ifndef OPENSSL_NO_RSA
1602                 if (alg_a & SSL_aRSA)
1603                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1604 #else
1605                 if (0)
1606                         ;
1607 #endif
1608 #ifndef OPENSSL_NO_DSA
1609                 else if (alg_a & SSL_aDSS)
1610                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1611 #endif
1612                 }
1613         else
1614 #endif /* !OPENSSL_NO_SRP */
1615 #ifndef OPENSSL_NO_RSA
1616         if (alg_k & SSL_kRSA)
1617                 {
1618                 if ((rsa=RSA_new()) == NULL)
1619                         {
1620                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1621                         goto err;
1622                         }
1623
1624                 param_len = 2;
1625                 if (param_len > n)
1626                         {
1627                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1628                                 SSL_R_LENGTH_TOO_SHORT);
1629                         goto f_err;
1630                         }
1631                 n2s(p,i);
1632
1633                 if (i > n - param_len)
1634                         {
1635                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1636                         goto f_err;
1637                         }
1638                 param_len += i;
1639
1640                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1641                         {
1642                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1643                         goto err;
1644                         }
1645                 p+=i;
1646
1647                 if (2 > n - param_len)
1648                         {
1649                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1650                                 SSL_R_LENGTH_TOO_SHORT);
1651                         goto f_err;
1652                         }
1653                 param_len += 2;
1654
1655                 n2s(p,i);
1656
1657                 if (i > n - param_len)
1658                         {
1659                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1660                         goto f_err;
1661                         }
1662                 param_len += i;
1663
1664                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1665                         {
1666                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1667                         goto err;
1668                         }
1669                 p+=i;
1670                 n-=param_len;
1671
1672                 /* this should be because we are using an export cipher */
1673                 if (alg_a & SSL_aRSA)
1674                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1675                 else
1676                         {
1677                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1678                         goto err;
1679                         }
1680                 s->session->sess_cert->peer_rsa_tmp=rsa;
1681                 rsa=NULL;
1682                 }
1683 #else /* OPENSSL_NO_RSA */
1684         if (0)
1685                 ;
1686 #endif
1687 #ifndef OPENSSL_NO_DH
1688         else if (alg_k & SSL_kEDH)
1689                 {
1690                 if ((dh=DH_new()) == NULL)
1691                         {
1692                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1693                         goto err;
1694                         }
1695
1696                 param_len = 2;
1697                 if (param_len > n)
1698                         {
1699                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1700                                 SSL_R_LENGTH_TOO_SHORT);
1701                         goto f_err;
1702                         }
1703                 n2s(p,i);
1704
1705                 if (i > n - param_len)
1706                         {
1707                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1708                         goto f_err;
1709                         }
1710                 param_len += i;
1711
1712                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1713                         {
1714                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1715                         goto err;
1716                         }
1717                 p+=i;
1718
1719                 if (2 > n - param_len)
1720                         {
1721                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1722                                 SSL_R_LENGTH_TOO_SHORT);
1723                         goto f_err;
1724                         }
1725                 param_len += 2;
1726
1727                 n2s(p,i);
1728
1729                 if (i > n - param_len)
1730                         {
1731                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1732                         goto f_err;
1733                         }
1734                 param_len += i;
1735
1736                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1737                         {
1738                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1739                         goto err;
1740                         }
1741                 p+=i;
1742
1743                 if (2 > n - param_len)
1744                         {
1745                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1746                                 SSL_R_LENGTH_TOO_SHORT);
1747                         goto f_err;
1748                         }
1749                 param_len += 2;
1750
1751                 n2s(p,i);
1752
1753                 if (i > n - param_len)
1754                         {
1755                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1756                         goto f_err;
1757                         }
1758                 param_len += i;
1759
1760                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1761                         {
1762                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1763                         goto err;
1764                         }
1765                 p+=i;
1766                 n-=param_len;
1767
1768 #ifndef OPENSSL_NO_RSA
1769                 if (alg_a & SSL_aRSA)
1770                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1771 #else
1772                 if (0)
1773                         ;
1774 #endif
1775 #ifndef OPENSSL_NO_DSA
1776                 else if (alg_a & SSL_aDSS)
1777                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1778 #endif
1779                 /* else anonymous DH, so no certificate or pkey. */
1780
1781                 s->session->sess_cert->peer_dh_tmp=dh;
1782                 dh=NULL;
1783                 }
1784         else if ((alg_k & SSL_kDHr) || (alg_k & SSL_kDHd))
1785                 {
1786                 al=SSL_AD_ILLEGAL_PARAMETER;
1787                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1788                 goto f_err;
1789                 }
1790 #endif /* !OPENSSL_NO_DH */
1791
1792 #ifndef OPENSSL_NO_ECDH
1793         else if (alg_k & SSL_kEECDH)
1794                 {
1795                 EC_GROUP *ngroup;
1796                 const EC_GROUP *group;
1797
1798                 if ((ecdh=EC_KEY_new()) == NULL)
1799                         {
1800                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1801                         goto err;
1802                         }
1803
1804                 /* Extract elliptic curve parameters and the
1805                  * server's ephemeral ECDH public key.
1806                  * Keep accumulating lengths of various components in
1807                  * param_len and make sure it never exceeds n.
1808                  */
1809
1810                 /* XXX: For now we only support named (not generic) curves
1811                  * and the ECParameters in this case is just three bytes. We
1812                  * also need one byte for the length of the encoded point
1813                  */
1814                 param_len=4;
1815                 if (param_len > n)
1816                         {
1817                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1818                                 SSL_R_LENGTH_TOO_SHORT);
1819                         goto f_err;
1820                         }
1821                 /* Check curve is one of our preferences, if not server has
1822                  * sent an invalid curve. ECParameters is 3 bytes.
1823                  */
1824                 if (!tls1_check_curve(s, p, 3))
1825                         {
1826                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_CURVE);
1827                         goto f_err;
1828                         }
1829
1830                 if ((curve_nid = tls1_ec_curve_id2nid(*(p + 2))) == 0)
1831                         {
1832                         al=SSL_AD_INTERNAL_ERROR;
1833                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1834                         goto f_err;
1835                         }
1836
1837                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1838                 if (ngroup == NULL)
1839                         {
1840                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1841                         goto err;
1842                         }
1843                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1844                         {
1845                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1846                         goto err;
1847                         }
1848                 EC_GROUP_free(ngroup);
1849
1850                 group = EC_KEY_get0_group(ecdh);
1851
1852                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1853                     (EC_GROUP_get_degree(group) > 163))
1854                         {
1855                         al=SSL_AD_EXPORT_RESTRICTION;
1856                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1857                         goto f_err;
1858                         }
1859
1860                 p+=3;
1861
1862                 /* Next, get the encoded ECPoint */
1863                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1864                     ((bn_ctx = BN_CTX_new()) == NULL))
1865                         {
1866                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1867                         goto err;
1868                         }
1869
1870                 encoded_pt_len = *p;  /* length of encoded point */
1871                 p+=1;
1872
1873                 if ((encoded_pt_len > n - param_len) ||
1874                     (EC_POINT_oct2point(group, srvr_ecpoint,
1875                         p, encoded_pt_len, bn_ctx) == 0))
1876                         {
1877                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1878                         goto f_err;
1879                         }
1880                 param_len += encoded_pt_len;
1881
1882                 n-=param_len;
1883                 p+=encoded_pt_len;
1884
1885                 /* The ECC/TLS specification does not mention
1886                  * the use of DSA to sign ECParameters in the server
1887                  * key exchange message. We do support RSA and ECDSA.
1888                  */
1889                 if (0) ;
1890 #ifndef OPENSSL_NO_RSA
1891                 else if (alg_a & SSL_aRSA)
1892                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1893 #endif
1894 #ifndef OPENSSL_NO_ECDSA
1895                 else if (alg_a & SSL_aECDSA)
1896                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1897 #endif
1898                 /* else anonymous ECDH, so no certificate or pkey. */
1899                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1900                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1901                 ecdh=NULL;
1902                 BN_CTX_free(bn_ctx);
1903                 bn_ctx = NULL;
1904                 EC_POINT_free(srvr_ecpoint);
1905                 srvr_ecpoint = NULL;
1906                 }
1907         else if (alg_k)
1908                 {
1909                 al=SSL_AD_UNEXPECTED_MESSAGE;
1910                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1911                 goto f_err;
1912                 }
1913 #endif /* !OPENSSL_NO_ECDH */
1914
1915
1916         /* p points to the next byte, there are 'n' bytes left */
1917
1918         /* if it was signed, check the signature */
1919         if (pkey != NULL)
1920                 {
1921                 if (SSL_USE_SIGALGS(s))
1922                         {
1923                         int rv;
1924                         if (2 > n)
1925                                 {
1926                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1927                                         SSL_R_LENGTH_TOO_SHORT);
1928                                 goto f_err;
1929                                 }
1930                         rv = tls12_check_peer_sigalg(&md, s, p, pkey);
1931                         if (rv == -1)
1932                                 goto err;
1933                         else if (rv == 0)
1934                                 {
1935                                 goto f_err;
1936                                 }
1937 #ifdef SSL_DEBUG
1938 fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
1939 #endif
1940                         p += 2;
1941                         n -= 2;
1942                         }
1943                 else
1944                         md = EVP_sha1();
1945
1946                 if (2 > n)
1947                         {
1948                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1949                                 SSL_R_LENGTH_TOO_SHORT);
1950                         goto f_err;
1951                         }
1952                 n2s(p,i);
1953                 n-=2;
1954                 j=EVP_PKEY_size(pkey);
1955
1956                 /* Check signature length. If n is 0 then signature is empty */
1957                 if ((i != n) || (n > j) || (n <= 0))
1958                         {
1959                         /* wrong packet length */
1960                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1961                         goto f_err;
1962                         }
1963
1964 #ifndef OPENSSL_NO_RSA
1965                 if (pkey->type == EVP_PKEY_RSA && !SSL_USE_SIGALGS(s))
1966                         {
1967                         int num;
1968                         unsigned int size;
1969
1970                         j=0;
1971                         q=md_buf;
1972                         for (num=2; num > 0; num--)
1973                                 {
1974                                 EVP_MD_CTX_set_flags(&md_ctx,
1975                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1976                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1977                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1978                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1979                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1980                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1981                                 EVP_DigestFinal_ex(&md_ctx,q,&size);
1982                                 q+=size;
1983                                 j+=size;
1984                                 }
1985                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1986                                                                 pkey->pkey.rsa);
1987                         if (i < 0)
1988                                 {
1989                                 al=SSL_AD_DECRYPT_ERROR;
1990                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1991                                 goto f_err;
1992                                 }
1993                         if (i == 0)
1994                                 {
1995                                 /* bad signature */
1996                                 al=SSL_AD_DECRYPT_ERROR;
1997                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1998                                 goto f_err;
1999                                 }
2000                         }
2001                 else
2002 #endif
2003                         {
2004                         EVP_VerifyInit_ex(&md_ctx, md, NULL);
2005                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
2006                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
2007                         EVP_VerifyUpdate(&md_ctx,param,param_len);
2008                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
2009                                 {
2010                                 /* bad signature */
2011                                 al=SSL_AD_DECRYPT_ERROR;
2012                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
2013                                 goto f_err;
2014                                 }
2015                         }
2016                 }
2017         else
2018                 {
2019                 /* aNULL, aSRP or kPSK do not need public keys */
2020                 if (!(alg_a & (SSL_aNULL|SSL_aSRP)) && !(alg_k & SSL_kPSK))
2021                         {
2022                         /* Might be wrong key type, check it */
2023                         if (ssl3_check_cert_and_algorithm(s))
2024                                 /* Otherwise this shouldn't happen */
2025                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2026                         goto err;
2027                         }
2028                 /* still data left over */
2029                 if (n != 0)
2030                         {
2031                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
2032                         goto f_err;
2033                         }
2034                 }
2035         EVP_PKEY_free(pkey);
2036         EVP_MD_CTX_cleanup(&md_ctx);
2037         return(1);
2038 f_err:
2039         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2040 err:
2041         EVP_PKEY_free(pkey);
2042 #ifndef OPENSSL_NO_RSA
2043         if (rsa != NULL)
2044                 RSA_free(rsa);
2045 #endif
2046 #ifndef OPENSSL_NO_DH
2047         if (dh != NULL)
2048                 DH_free(dh);
2049 #endif
2050 #ifndef OPENSSL_NO_ECDH
2051         BN_CTX_free(bn_ctx);
2052         EC_POINT_free(srvr_ecpoint);
2053         if (ecdh != NULL)
2054                 EC_KEY_free(ecdh);
2055 #endif
2056         EVP_MD_CTX_cleanup(&md_ctx);
2057         return(-1);
2058         }
2059
2060 int ssl3_get_certificate_request(SSL *s)
2061         {
2062         int ok,ret=0;
2063         unsigned long n,nc,l;
2064         unsigned int llen, ctype_num,i;
2065         X509_NAME *xn=NULL;
2066         const unsigned char *p,*q;
2067         unsigned char *d;
2068         STACK_OF(X509_NAME) *ca_sk=NULL;
2069
2070         n=s->method->ssl_get_message(s,
2071                 SSL3_ST_CR_CERT_REQ_A,
2072                 SSL3_ST_CR_CERT_REQ_B,
2073                 -1,
2074                 s->max_cert_list,
2075                 &ok);
2076
2077         if (!ok) return((int)n);
2078
2079         s->s3->tmp.cert_req=0;
2080
2081         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
2082                 {
2083                 s->s3->tmp.reuse_message=1;
2084                 /* If we get here we don't need any cached handshake records
2085                  * as we wont be doing client auth.
2086                  */
2087                 if (s->s3->handshake_buffer)
2088                         {
2089                         if (!ssl3_digest_cached_records(s))
2090                                 goto err;
2091                         }
2092                 return(1);
2093                 }
2094
2095         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
2096                 {
2097                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2098                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
2099                 goto err;
2100                 }
2101
2102         /* TLS does not like anon-DH with client cert */
2103         if (s->version > SSL3_VERSION)
2104                 {
2105                 if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
2106                         {
2107                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2108                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
2109                         goto err;
2110                         }
2111                 }
2112
2113         p=d=(unsigned char *)s->init_msg;
2114
2115         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
2116                 {
2117                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2118                 goto err;
2119                 }
2120
2121         /* get the certificate types */
2122         ctype_num= *(p++);
2123         if (s->cert->ctypes)
2124                 {
2125                 OPENSSL_free(s->cert->ctypes);
2126                 s->cert->ctypes = NULL;
2127                 }
2128         if (ctype_num > SSL3_CT_NUMBER)
2129                 {
2130                 /* If we exceed static buffer copy all to cert structure */
2131                 s->cert->ctypes = OPENSSL_malloc(ctype_num);
2132                 memcpy(s->cert->ctypes, p, ctype_num);
2133                 s->cert->ctype_num = (size_t)ctype_num;
2134                 ctype_num=SSL3_CT_NUMBER;
2135                 }
2136         for (i=0; i<ctype_num; i++)
2137                 s->s3->tmp.ctype[i]= p[i];
2138         p+=p[-1];
2139         if (SSL_USE_SIGALGS(s))
2140                 {
2141                 n2s(p, llen);
2142                 /* Check we have enough room for signature algorithms and
2143                  * following length value.
2144                  */
2145                 if ((unsigned long)(p - d + llen + 2) > n)
2146                         {
2147                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2148                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_DATA_LENGTH_TOO_LONG);
2149                         goto err;
2150                         }
2151                 /* Clear certificate digests and validity flags */
2152                 for (i = 0; i < SSL_PKEY_NUM; i++)
2153                         {
2154                         s->cert->pkeys[i].digest = NULL;
2155                         s->cert->pkeys[i].valid_flags = 0;
2156                         }
2157                 if ((llen & 1) || !tls1_save_sigalgs(s, p, llen))
2158                         {
2159                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2160                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_SIGNATURE_ALGORITHMS_ERROR);
2161                         goto err;
2162                         }
2163                 if (!tls1_process_sigalgs(s))
2164                         {
2165                         ssl3_send_alert(s,SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
2166                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
2167                         goto err;
2168                         }
2169                 p += llen;
2170                 }
2171
2172         /* get the CA RDNs */
2173         n2s(p,llen);
2174 #if 0
2175 {
2176 FILE *out;
2177 out=fopen("/tmp/vsign.der","w");
2178 fwrite(p,1,llen,out);
2179 fclose(out);
2180 }
2181 #endif
2182
2183         if ((unsigned long)(p - d + llen) != n)
2184                 {
2185                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2186                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
2187                 goto err;
2188                 }
2189
2190         for (nc=0; nc<llen; )
2191                 {
2192                 n2s(p,l);
2193                 if ((l+nc+2) > llen)
2194                         {
2195                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
2196                                 goto cont; /* netscape bugs */
2197                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2198                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
2199                         goto err;
2200                         }
2201
2202                 q=p;
2203
2204                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
2205                         {
2206                         /* If netscape tolerance is on, ignore errors */
2207                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
2208                                 goto cont;
2209                         else
2210                                 {
2211                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2212                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
2213                                 goto err;
2214                                 }
2215                         }
2216
2217                 if (q != (p+l))
2218                         {
2219                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2220                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
2221                         goto err;
2222                         }
2223                 if (!sk_X509_NAME_push(ca_sk,xn))
2224                         {
2225                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
2226                         goto err;
2227                         }
2228
2229                 p+=l;
2230                 nc+=l+2;
2231                 }
2232
2233         if (0)
2234                 {
2235 cont:
2236                 ERR_clear_error();
2237                 }
2238
2239         /* we should setup a certificate to return.... */
2240         s->s3->tmp.cert_req=1;
2241         s->s3->tmp.ctype_num=ctype_num;
2242         if (s->s3->tmp.ca_names != NULL)
2243                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
2244         s->s3->tmp.ca_names=ca_sk;
2245         ca_sk=NULL;
2246
2247         ret=1;
2248 err:
2249         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
2250         return(ret);
2251         }
2252
2253 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
2254         {
2255         return(X509_NAME_cmp(*a,*b));
2256         }
2257 #ifndef OPENSSL_NO_TLSEXT
2258 int ssl3_get_new_session_ticket(SSL *s)
2259         {
2260         int ok,al,ret=0, ticklen;
2261         long n;
2262         const unsigned char *p;
2263         unsigned char *d;
2264
2265         n=s->method->ssl_get_message(s,
2266                 SSL3_ST_CR_SESSION_TICKET_A,
2267                 SSL3_ST_CR_SESSION_TICKET_B,
2268                 -1,
2269                 16384,
2270                 &ok);
2271
2272         if (!ok)
2273                 return((int)n);
2274
2275         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
2276                 {
2277                 s->s3->tmp.reuse_message=1;
2278                 return(1);
2279                 }
2280         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
2281                 {
2282                 al=SSL_AD_UNEXPECTED_MESSAGE;
2283                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
2284                 goto f_err;
2285                 }
2286         if (n < 6)
2287                 {
2288                 /* need at least ticket_lifetime_hint + ticket length */
2289                 al = SSL_AD_DECODE_ERROR;
2290                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2291                 goto f_err;
2292                 }
2293
2294         p=d=(unsigned char *)s->init_msg;
2295         n2l(p, s->session->tlsext_tick_lifetime_hint);
2296         n2s(p, ticklen);
2297         /* ticket_lifetime_hint + ticket_length + ticket */
2298         if (ticklen + 6 != n)
2299                 {
2300                 al = SSL_AD_DECODE_ERROR;
2301                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
2302                 goto f_err;
2303                 }
2304         if (s->session->tlsext_tick)
2305                 {
2306                 OPENSSL_free(s->session->tlsext_tick);
2307                 s->session->tlsext_ticklen = 0;
2308                 }
2309         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
2310         if (!s->session->tlsext_tick)
2311                 {
2312                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
2313                 goto err;
2314                 }
2315         memcpy(s->session->tlsext_tick, p, ticklen);
2316         s->session->tlsext_ticklen = ticklen;
2317         /* There are two ways to detect a resumed ticket session.
2318          * One is to set an appropriate session ID and then the server
2319          * must return a match in ServerHello. This allows the normal
2320          * client session ID matching to work and we know much
2321          * earlier that the ticket has been accepted.
2322          *
2323          * The other way is to set zero length session ID when the
2324          * ticket is presented and rely on the handshake to determine
2325          * session resumption.
2326          *
2327          * We choose the former approach because this fits in with
2328          * assumptions elsewhere in OpenSSL. The session ID is set
2329          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
2330          * ticket.
2331          */
2332         EVP_Digest(p, ticklen,
2333                         s->session->session_id, &s->session->session_id_length,
2334 #ifndef OPENSSL_NO_SHA256
2335                                                         EVP_sha256(), NULL);
2336 #else
2337                                                         EVP_sha1(), NULL);
2338 #endif
2339         ret=1;
2340         return(ret);
2341 f_err:
2342         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2343 err:
2344         return(-1);
2345         }
2346
2347 int ssl3_get_cert_status(SSL *s)
2348         {
2349         int ok, al;
2350         unsigned long resplen,n;
2351         const unsigned char *p;
2352
2353         n=s->method->ssl_get_message(s,
2354                 SSL3_ST_CR_CERT_STATUS_A,
2355                 SSL3_ST_CR_CERT_STATUS_B,
2356                 SSL3_MT_CERTIFICATE_STATUS,
2357                 16384,
2358                 &ok);
2359
2360         if (!ok) return((int)n);
2361         if (n < 4)
2362                 {
2363                 /* need at least status type + length */
2364                 al = SSL_AD_DECODE_ERROR;
2365                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2366                 goto f_err;
2367                 }
2368         p = (unsigned char *)s->init_msg;
2369         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
2370                 {
2371                 al = SSL_AD_DECODE_ERROR;
2372                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
2373                 goto f_err;
2374                 }
2375         n2l3(p, resplen);
2376         if (resplen + 4 != n)
2377                 {
2378                 al = SSL_AD_DECODE_ERROR;
2379                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
2380                 goto f_err;
2381                 }
2382         if (s->tlsext_ocsp_resp)
2383                 OPENSSL_free(s->tlsext_ocsp_resp);
2384         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
2385         if (!s->tlsext_ocsp_resp)
2386                 {
2387                 al = SSL_AD_INTERNAL_ERROR;
2388                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2389                 goto f_err;
2390                 }
2391         s->tlsext_ocsp_resplen = resplen;
2392         if (s->ctx->tlsext_status_cb)
2393                 {
2394                 int ret;
2395                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
2396                 if (ret == 0)
2397                         {
2398                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
2399                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
2400                         goto f_err;
2401                         }
2402                 if (ret < 0)
2403                         {
2404                         al = SSL_AD_INTERNAL_ERROR;
2405                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
2406                         goto f_err;
2407                         }
2408                 }
2409         return 1;
2410 f_err:
2411         ssl3_send_alert(s,SSL3_AL_FATAL,al);
2412         return(-1);
2413         }
2414 #endif
2415
2416 int ssl3_get_server_done(SSL *s)
2417         {
2418         int ok,ret=0;
2419         long n;
2420
2421         n=s->method->ssl_get_message(s,
2422                 SSL3_ST_CR_SRVR_DONE_A,
2423                 SSL3_ST_CR_SRVR_DONE_B,
2424                 SSL3_MT_SERVER_DONE,
2425                 30, /* should be very small, like 0 :-) */
2426                 &ok);
2427
2428         if (!ok) return((int)n);
2429         if (n > 0)
2430                 {
2431                 /* should contain no data */
2432                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
2433                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
2434                 return -1;
2435                 }
2436         ret=1;
2437         return(ret);
2438         }
2439
2440
2441 int ssl3_send_client_key_exchange(SSL *s)
2442         {
2443         unsigned char *p;
2444         int n;
2445         unsigned long alg_k;
2446 #ifndef OPENSSL_NO_RSA
2447         unsigned char *q;
2448         EVP_PKEY *pkey=NULL;
2449 #endif
2450 #ifndef OPENSSL_NO_KRB5
2451         KSSL_ERR kssl_err;
2452 #endif /* OPENSSL_NO_KRB5 */
2453 #ifndef OPENSSL_NO_ECDH
2454         EC_KEY *clnt_ecdh = NULL;
2455         const EC_POINT *srvr_ecpoint = NULL;
2456         EVP_PKEY *srvr_pub_pkey = NULL;
2457         unsigned char *encodedPoint = NULL;
2458         int encoded_pt_len = 0;
2459         BN_CTX * bn_ctx = NULL;
2460 #endif
2461
2462         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
2463                 {
2464                 p = ssl_handshake_start(s);
2465
2466                 alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
2467
2468                 /* Fool emacs indentation */
2469                 if (0) {}
2470 #ifndef OPENSSL_NO_RSA
2471                 else if (alg_k & SSL_kRSA)
2472                         {
2473                         RSA *rsa;
2474                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2475
2476                         if (s->session->sess_cert == NULL)
2477                                 {
2478                                 /* We should always have a server certificate with SSL_kRSA. */
2479                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2480                                 goto err;
2481                                 }
2482
2483                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
2484                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2485                         else
2486                                 {
2487                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2488                                 if ((pkey == NULL) ||
2489                                         (pkey->type != EVP_PKEY_RSA) ||
2490                                         (pkey->pkey.rsa == NULL))
2491                                         {
2492                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2493                                         goto err;
2494                                         }
2495                                 rsa=pkey->pkey.rsa;
2496                                 EVP_PKEY_free(pkey);
2497                                 }
2498
2499                         tmp_buf[0]=s->client_version>>8;
2500                         tmp_buf[1]=s->client_version&0xff;
2501                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2502                                         goto err;
2503
2504                         s->session->master_key_length=sizeof tmp_buf;
2505
2506                         q=p;
2507                         /* Fix buf for TLS and beyond */
2508                         if (s->version > SSL3_VERSION)
2509                                 p+=2;
2510                         n=RSA_public_encrypt(sizeof tmp_buf,
2511                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2512 #ifdef PKCS1_CHECK
2513                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2514                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2515 #endif
2516                         if (n <= 0)
2517                                 {
2518                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2519                                 goto err;
2520                                 }
2521
2522                         /* Fix buf for TLS and beyond */
2523                         if (s->version > SSL3_VERSION)
2524                                 {
2525                                 s2n(n,q);
2526                                 n+=2;
2527                                 }
2528
2529                         s->session->master_key_length=
2530                                 s->method->ssl3_enc->generate_master_secret(s,
2531                                         s->session->master_key,
2532                                         tmp_buf,sizeof tmp_buf);
2533                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2534                         }
2535 #endif
2536 #ifndef OPENSSL_NO_KRB5
2537                 else if (alg_k & SSL_kKRB5)
2538                         {
2539                         krb5_error_code krb5rc;
2540                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2541                         /*  krb5_data   krb5_ap_req;  */
2542                         krb5_data       *enc_ticket;
2543                         krb5_data       authenticator, *authp = NULL;
2544                         EVP_CIPHER_CTX  ciph_ctx;
2545                         const EVP_CIPHER *enc = NULL;
2546                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2547                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2548                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2549                                                 + EVP_MAX_IV_LENGTH];
2550                         int             padl, outl = sizeof(epms);
2551
2552                         EVP_CIPHER_CTX_init(&ciph_ctx);
2553
2554 #ifdef KSSL_DEBUG
2555                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2556                                 alg_k, SSL_kKRB5);
2557 #endif  /* KSSL_DEBUG */
2558
2559                         authp = NULL;
2560 #ifdef KRB5SENDAUTH
2561                         if (KRB5SENDAUTH)  authp = &authenticator;
2562 #endif  /* KRB5SENDAUTH */
2563
2564                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2565                                 &kssl_err);
2566                         enc = kssl_map_enc(kssl_ctx->enctype);
2567                         if (enc == NULL)
2568                             goto err;
2569 #ifdef KSSL_DEBUG
2570                         {
2571                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2572                         if (krb5rc && kssl_err.text)
2573                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2574                         }
2575 #endif  /* KSSL_DEBUG */
2576
2577                         if (krb5rc)
2578                                 {
2579                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2580                                                 SSL_AD_HANDSHAKE_FAILURE);
2581                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2582                                                 kssl_err.reason);
2583                                 goto err;
2584                                 }
2585
2586                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2587                         **  in place of RFC 2712 KerberosWrapper, as in:
2588                         **
2589                         **  Send ticket (copy to *p, set n = length)
2590                         **  n = krb5_ap_req.length;
2591                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2592                         **  if (krb5_ap_req.data)
2593                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2594                         **
2595                         **  Now using real RFC 2712 KerberosWrapper
2596                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2597                         **  Note: 2712 "opaque" types are here replaced
2598                         **  with a 2-byte length followed by the value.
2599                         **  Example:
2600                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2601                         **  Where "xx xx" = length bytes.  Shown here with
2602                         **  optional authenticator omitted.
2603                         */
2604
2605                         /*  KerberosWrapper.Ticket              */
2606                         s2n(enc_ticket->length,p);
2607                         memcpy(p, enc_ticket->data, enc_ticket->length);
2608                         p+= enc_ticket->length;
2609                         n = enc_ticket->length + 2;
2610
2611                         /*  KerberosWrapper.Authenticator       */
2612                         if (authp  &&  authp->length)
2613                                 {
2614                                 s2n(authp->length,p);
2615                                 memcpy(p, authp->data, authp->length);
2616                                 p+= authp->length;
2617                                 n+= authp->length + 2;
2618
2619                                 free(authp->data);
2620                                 authp->data = NULL;
2621                                 authp->length = 0;
2622                                 }
2623                         else
2624                                 {
2625                                 s2n(0,p);/*  null authenticator length  */
2626                                 n+=2;
2627                                 }
2628
2629                             tmp_buf[0]=s->client_version>>8;
2630                             tmp_buf[1]=s->client_version&0xff;
2631                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2632                                 goto err;
2633
2634                         /*  20010420 VRS.  Tried it this way; failed.
2635                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2636                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2637                         **                              kssl_ctx->length);
2638                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2639                         */
2640
2641                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2642                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2643                                 kssl_ctx->key,iv);
2644                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2645                                 sizeof tmp_buf);
2646                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2647                         outl += padl;
2648                         if (outl > (int)sizeof epms)
2649                                 {
2650                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2651                                 goto err;
2652                                 }
2653                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2654
2655                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2656                         s2n(outl,p);
2657                         memcpy(p, epms, outl);
2658                         p+=outl;
2659                         n+=outl + 2;
2660
2661                         s->session->master_key_length=
2662                                 s->method->ssl3_enc->generate_master_secret(s,
2663                                         s->session->master_key,
2664                                         tmp_buf, sizeof tmp_buf);
2665
2666                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2667                         OPENSSL_cleanse(epms, outl);
2668                         }
2669 #endif
2670 #ifndef OPENSSL_NO_DH
2671                 else if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2672                         {
2673                         DH *dh_srvr,*dh_clnt;
2674                         SESS_CERT *scert = s->session->sess_cert;
2675
2676                         if (scert == NULL)
2677                                 {
2678                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2679                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2680                                 goto err;
2681                                 }
2682
2683                         if (scert->peer_dh_tmp != NULL)
2684                                 dh_srvr=scert->peer_dh_tmp;
2685                         else
2686                                 {
2687                                 /* we get them from the cert */
2688                                 int idx = scert->peer_cert_type;
2689                                 EVP_PKEY *spkey = NULL;
2690                                 dh_srvr = NULL;
2691                                 if (idx >= 0)
2692                                         spkey = X509_get_pubkey(
2693                                                 scert->peer_pkeys[idx].x509);
2694                                 if (spkey)
2695                                         {
2696                                         dh_srvr = EVP_PKEY_get1_DH(spkey);
2697                                         EVP_PKEY_free(spkey);
2698                                         }
2699                                 if (dh_srvr == NULL)
2700                                         {
2701                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2702                                             ERR_R_INTERNAL_ERROR);
2703                                         goto err;
2704                                         }
2705                                 }
2706                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2707                                 {
2708                                 /* Use client certificate key */
2709                                 EVP_PKEY *clkey = s->cert->key->privatekey;
2710                                 dh_clnt = NULL;
2711                                 if (clkey)
2712                                         dh_clnt = EVP_PKEY_get1_DH(clkey);
2713                                 if (dh_clnt == NULL)
2714                                         {
2715                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2716                                             ERR_R_INTERNAL_ERROR);
2717                                         goto err;
2718                                         }
2719                                 }
2720                         else
2721                                 {
2722                                 /* generate a new random key */
2723                                 if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2724                                         {
2725                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2726                                         goto err;
2727                                         }
2728                                 if (!DH_generate_key(dh_clnt))
2729                                         {
2730                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2731                                         DH_free(dh_clnt);
2732                                         goto err;
2733                                         }
2734                                 }
2735
2736                         /* use the 'p' output buffer for the DH key, but
2737                          * make sure to clear it out afterwards */
2738
2739                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2740                         if (scert->peer_dh_tmp == NULL)
2741                                 DH_free(dh_srvr);
2742
2743                         if (n <= 0)
2744                                 {
2745                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2746                                 DH_free(dh_clnt);
2747                                 goto err;
2748                                 }
2749
2750                         /* generate master key from the result */
2751                         s->session->master_key_length=
2752                                 s->method->ssl3_enc->generate_master_secret(s,
2753                                         s->session->master_key,p,n);
2754                         /* clean up */
2755                         memset(p,0,n);
2756
2757                         if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY)
2758                                 n = 0;
2759                         else
2760                                 {
2761                                 /* send off the data */
2762                                 n=BN_num_bytes(dh_clnt->pub_key);
2763                                 s2n(n,p);
2764                                 BN_bn2bin(dh_clnt->pub_key,p);
2765                                 n+=2;
2766                                 }
2767
2768                         DH_free(dh_clnt);
2769
2770                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2771                         }
2772 #endif
2773
2774 #ifndef OPENSSL_NO_ECDH
2775                 else if (alg_k & (SSL_kEECDH|SSL_kECDHr|SSL_kECDHe))
2776                         {
2777                         const EC_GROUP *srvr_group = NULL;
2778                         EC_KEY *tkey;
2779                         int ecdh_clnt_cert = 0;
2780                         int field_size = 0;
2781
2782                         if (s->session->sess_cert == NULL)
2783                                 {
2784                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2785                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2786                                 goto err;
2787                                 }
2788
2789                         /* Did we send out the client's
2790                          * ECDH share for use in premaster
2791                          * computation as part of client certificate?
2792                          * If so, set ecdh_clnt_cert to 1.
2793                          */
2794                         if ((alg_k & (SSL_kECDHr|SSL_kECDHe)) && (s->cert != NULL))
2795                                 {
2796                                 /* XXX: For now, we do not support client
2797                                  * authentication using ECDH certificates.
2798                                  * To add such support, one needs to add
2799                                  * code that checks for appropriate
2800                                  * conditions and sets ecdh_clnt_cert to 1.
2801                                  * For example, the cert have an ECC
2802                                  * key on the same curve as the server's
2803                                  * and the key should be authorized for
2804                                  * key agreement.
2805                                  *
2806                                  * One also needs to add code in ssl3_connect
2807                                  * to skip sending the certificate verify
2808                                  * message.
2809                                  *
2810                                  * if ((s->cert->key->privatekey != NULL) &&
2811                                  *     (s->cert->key->privatekey->type ==
2812                                  *      EVP_PKEY_EC) && ...)
2813                                  * ecdh_clnt_cert = 1;
2814                                  */
2815                                 }
2816
2817                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2818                                 {
2819                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2820                                 }
2821                         else
2822                                 {
2823                                 /* Get the Server Public Key from Cert */
2824                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2825                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2826                                 if ((srvr_pub_pkey == NULL) ||
2827                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2828                                     (srvr_pub_pkey->pkey.ec == NULL))
2829                                         {
2830                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2831                                             ERR_R_INTERNAL_ERROR);
2832                                         goto err;
2833                                         }
2834
2835                                 tkey = srvr_pub_pkey->pkey.ec;
2836                                 }
2837
2838                         srvr_group   = EC_KEY_get0_group(tkey);
2839                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2840
2841                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2842                                 {
2843                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2844                                     ERR_R_INTERNAL_ERROR);
2845                                 goto err;
2846                                 }
2847
2848                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2849                                 {
2850                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2851                                 goto err;
2852                                 }
2853
2854                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2855                                 {
2856                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2857                                 goto err;
2858                                 }
2859                         if (ecdh_clnt_cert)
2860                                 {
2861                                 /* Reuse key info from our certificate
2862                                  * We only need our private key to perform
2863                                  * the ECDH computation.
2864                                  */
2865                                 const BIGNUM *priv_key;
2866                                 tkey = s->cert->key->privatekey->pkey.ec;
2867                                 priv_key = EC_KEY_get0_private_key(tkey);
2868                                 if (priv_key == NULL)
2869                                         {
2870                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2871                                         goto err;
2872                                         }
2873                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2874                                         {
2875                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2876                                         goto err;
2877                                         }
2878                                 }
2879                         else
2880                                 {
2881                                 /* Generate a new ECDH key pair */
2882                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2883                                         {
2884                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2885                                         goto err;
2886                                         }
2887                                 }
2888
2889                         /* use the 'p' output buffer for the ECDH key, but
2890                          * make sure to clear it out afterwards
2891                          */
2892
2893                         field_size = EC_GROUP_get_degree(srvr_group);
2894                         if (field_size <= 0)
2895                                 {
2896                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2897                                        ERR_R_ECDH_LIB);
2898                                 goto err;
2899                                 }
2900                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2901                         if (n <= 0)
2902                                 {
2903                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2904                                        ERR_R_ECDH_LIB);
2905                                 goto err;
2906                                 }
2907
2908                         /* generate master key from the result */
2909                         s->session->master_key_length = s->method->ssl3_enc \
2910                             -> generate_master_secret(s,
2911                                 s->session->master_key,
2912                                 p, n);
2913
2914                         memset(p, 0, n); /* clean up */
2915
2916                         if (ecdh_clnt_cert)
2917                                 {
2918                                 /* Send empty client key exch message */
2919                                 n = 0;
2920                                 }
2921                         else
2922                                 {
2923                                 /* First check the size of encoding and
2924                                  * allocate memory accordingly.
2925                                  */
2926                                 encoded_pt_len =
2927                                     EC_POINT_point2oct(srvr_group,
2928                                         EC_KEY_get0_public_key(clnt_ecdh),
2929                                         POINT_CONVERSION_UNCOMPRESSED,
2930                                         NULL, 0, NULL);
2931
2932                                 encodedPoint = (unsigned char *)
2933                                     OPENSSL_malloc(encoded_pt_len *
2934                                         sizeof(unsigned char));
2935                                 bn_ctx = BN_CTX_new();
2936                                 if ((encodedPoint == NULL) ||
2937                                     (bn_ctx == NULL))
2938                                         {
2939                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2940                                         goto err;
2941                                         }
2942
2943                                 /* Encode the public key */
2944                                 n = EC_POINT_point2oct(srvr_group,
2945                                     EC_KEY_get0_public_key(clnt_ecdh),
2946                                     POINT_CONVERSION_UNCOMPRESSED,
2947                                     encodedPoint, encoded_pt_len, bn_ctx);
2948
2949                                 *p = n; /* length of encoded point */
2950                                 /* Encoded point will be copied here */
2951                                 p += 1;
2952                                 /* copy the point */
2953                                 memcpy((unsigned char *)p, encodedPoint, n);
2954                                 /* increment n to account for length field */
2955                                 n += 1;
2956                                 }
2957
2958                         /* Free allocated memory */
2959                         BN_CTX_free(bn_ctx);
2960                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2961                         if (clnt_ecdh != NULL)
2962                                  EC_KEY_free(clnt_ecdh);
2963                         EVP_PKEY_free(srvr_pub_pkey);
2964                         }
2965 #endif /* !OPENSSL_NO_ECDH */
2966                 else if (alg_k & SSL_kGOST)
2967                         {
2968                         /* GOST key exchange message creation */
2969                         EVP_PKEY_CTX *pkey_ctx;
2970                         X509 *peer_cert;
2971                         size_t msglen;
2972                         unsigned int md_len;
2973                         int keytype;
2974                         unsigned char premaster_secret[32],shared_ukm[32], tmp[256];
2975                         EVP_MD_CTX *ukm_hash;
2976                         EVP_PKEY *pub_key;
2977
2978                         /* Get server sertificate PKEY and create ctx from it */
2979                         peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST01)].x509;
2980                         if (!peer_cert)
2981                                 peer_cert=s->session->sess_cert->peer_pkeys[(keytype=SSL_PKEY_GOST94)].x509;
2982                         if (!peer_cert)         {
2983                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
2984                                         goto err;
2985                                 }
2986
2987                         pkey_ctx=EVP_PKEY_CTX_new(pub_key=X509_get_pubkey(peer_cert),NULL);
2988                         /* If we have send a certificate, and certificate key
2989
2990                          * parameters match those of server certificate, use
2991                          * certificate key for key exchange
2992                          */
2993
2994                          /* Otherwise, generate ephemeral key pair */
2995
2996                         EVP_PKEY_encrypt_init(pkey_ctx);
2997                           /* Generate session key */
2998                     RAND_bytes(premaster_secret,32);
2999                         /* If we have client certificate, use its secret as peer key */
3000                         if (s->s3->tmp.cert_req && s->cert->key->privatekey) {
3001                                 if (EVP_PKEY_derive_set_peer(pkey_ctx,s->cert->key->privatekey) <=0) {
3002                                         /* If there was an error - just ignore it. Ephemeral key
3003                                         * would be used
3004                                         */
3005                                         ERR_clear_error();
3006                                 }
3007                         }
3008                         /* Compute shared IV and store it in algorithm-specific
3009                          * context data */
3010                         ukm_hash = EVP_MD_CTX_create();
3011                         EVP_DigestInit(ukm_hash,EVP_get_digestbynid(NID_id_GostR3411_94));
3012                         EVP_DigestUpdate(ukm_hash,s->s3->client_random,SSL3_RANDOM_SIZE);
3013                         EVP_DigestUpdate(ukm_hash,s->s3->server_random,SSL3_RANDOM_SIZE);
3014                         EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len);
3015                         EVP_MD_CTX_destroy(ukm_hash);
3016                         if (EVP_PKEY_CTX_ctrl(pkey_ctx,-1,EVP_PKEY_OP_ENCRYPT,EVP_PKEY_CTRL_SET_IV,
3017                                 8,shared_ukm)<0) {
3018                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3019                                                 SSL_R_LIBRARY_BUG);
3020                                         goto err;
3021                                 }
3022                         /* Make GOST keytransport blob message */
3023                         /*Encapsulate it into sequence */
3024                         *(p++)=V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
3025                         msglen=255;
3026                         if (EVP_PKEY_encrypt(pkey_ctx,tmp,&msglen,premaster_secret,32)<0) {
3027                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3028                                         SSL_R_LIBRARY_BUG);
3029                                 goto err;
3030                         }
3031                         if (msglen >= 0x80)
3032                                 {
3033                                 *(p++)=0x81;
3034                                 *(p++)= msglen & 0xff;
3035                                 n=msglen+3;
3036                                 }
3037                         else
3038                                 {
3039                                 *(p++)= msglen & 0xff;
3040                                 n=msglen+2;
3041                                 }
3042                         memcpy(p, tmp, msglen);
3043                         /* Check if pubkey from client certificate was used */
3044                         if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
3045                                 {
3046                                 /* Set flag "skip certificate verify" */
3047                                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3048                                 }
3049                         EVP_PKEY_CTX_free(pkey_ctx);
3050                         s->session->master_key_length=
3051                                 s->method->ssl3_enc->generate_master_secret(s,
3052                                         s->session->master_key,premaster_secret,32);
3053                         EVP_PKEY_free(pub_key);
3054
3055                         }
3056 #ifndef OPENSSL_NO_SRP
3057                 else if (alg_k & SSL_kSRP)
3058                         {
3059                         if (s->srp_ctx.A != NULL)
3060                                 {
3061                                 /* send off the data */
3062                                 n=BN_num_bytes(s->srp_ctx.A);
3063                                 s2n(n,p);
3064                                 BN_bn2bin(s->srp_ctx.A,p);
3065                                 n+=2;
3066                                 }
3067                         else
3068                                 {
3069                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3070                                 goto err;
3071                                 }
3072                         if (s->session->srp_username != NULL)
3073                                 OPENSSL_free(s->session->srp_username);
3074                         s->session->srp_username = BUF_strdup(s->srp_ctx.login);
3075                         if (s->session->srp_username == NULL)
3076                                 {
3077                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3078                                         ERR_R_MALLOC_FAILURE);
3079                                 goto err;
3080                                 }
3081
3082                         if ((s->session->master_key_length = SRP_generate_client_master_secret(s,s->session->master_key))<0)
3083                                 {
3084                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
3085                                 goto err;
3086                                 }
3087                         }
3088 #endif
3089 #ifndef OPENSSL_NO_PSK
3090                 else if (alg_k & SSL_kPSK)
3091                         {
3092                         /* The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes
3093                          * to return a \0-terminated identity. The last byte
3094                          * is for us for simulating strnlen. */
3095                         char identity[PSK_MAX_IDENTITY_LEN + 2];
3096                         size_t identity_len;
3097                         unsigned char *t = NULL;
3098                         unsigned char psk_or_pre_ms[PSK_MAX_PSK_LEN*2+4];
3099                         unsigned int pre_ms_len = 0, psk_len = 0;
3100                         int psk_err = 1;
3101
3102                         n = 0;
3103                         if (s->psk_client_callback == NULL)
3104                                 {
3105                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3106                                         SSL_R_PSK_NO_CLIENT_CB);
3107                                 goto err;
3108                                 }
3109
3110                         memset(identity, 0, sizeof(identity));
3111                         psk_len = s->psk_client_callback(s, s->ctx->psk_identity_hint,
3112                                 identity, sizeof(identity) - 1,
3113                                 psk_or_pre_ms, sizeof(psk_or_pre_ms));
3114                         if (psk_len > PSK_MAX_PSK_LEN)
3115                                 {
3116                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3117                                         ERR_R_INTERNAL_ERROR);
3118                                 goto psk_err;
3119                                 }
3120                         else if (psk_len == 0)
3121                                 {
3122                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3123                                         SSL_R_PSK_IDENTITY_NOT_FOUND);
3124                                 goto psk_err;
3125                                 }
3126                         identity[PSK_MAX_IDENTITY_LEN + 1] = '\0';
3127                         identity_len = strlen(identity);
3128                         if (identity_len > PSK_MAX_IDENTITY_LEN)
3129                                 {
3130                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3131                                         ERR_R_INTERNAL_ERROR);
3132                                 goto psk_err;
3133                                 }
3134                         /* create PSK pre_master_secret */
3135                         pre_ms_len = 2+psk_len+2+psk_len;
3136                         t = psk_or_pre_ms;
3137                         memmove(psk_or_pre_ms+psk_len+4, psk_or_pre_ms, psk_len);
3138                         s2n(psk_len, t);
3139                         memset(t, 0, psk_len);
3140                         t+=psk_len;
3141                         s2n(psk_len, t);
3142
3143                         if (s->session->psk_identity_hint != NULL)
3144                                 OPENSSL_free(s->session->psk_identity_hint);
3145                         s->session->psk_identity_hint = BUF_strdup(s->ctx->psk_identity_hint);
3146                         if (s->ctx->psk_identity_hint != NULL &&
3147                                 s->session->psk_identity_hint == NULL)
3148                                 {
3149                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3150                                         ERR_R_MALLOC_FAILURE);
3151                                 goto psk_err;
3152                                 }
3153
3154                         if (s->session->psk_identity != NULL)
3155                                 OPENSSL_free(s->session->psk_identity);
3156                         s->session->psk_identity = BUF_strdup(identity);
3157                         if (s->session->psk_identity == NULL)
3158                                 {
3159                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3160                                         ERR_R_MALLOC_FAILURE);
3161                                 goto psk_err;
3162                                 }
3163
3164                         s->session->master_key_length =
3165                                 s->method->ssl3_enc->generate_master_secret(s,
3166                                         s->session->master_key,
3167                                         psk_or_pre_ms, pre_ms_len);
3168                         s2n(identity_len, p);
3169                         memcpy(p, identity, identity_len);
3170                         n = 2 + identity_len;
3171                         psk_err = 0;
3172                 psk_err:
3173                         OPENSSL_cleanse(identity, sizeof(identity));
3174                         OPENSSL_cleanse(psk_or_pre_ms, sizeof(psk_or_pre_ms));
3175                         if (psk_err != 0)
3176                                 {
3177                                 ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
3178                                 goto err;
3179                                 }
3180                         }
3181 #endif
3182                 else
3183                         {
3184                         ssl3_send_alert(s, SSL3_AL_FATAL,
3185                             SSL_AD_HANDSHAKE_FAILURE);
3186                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
3187                             ERR_R_INTERNAL_ERROR);
3188                         goto err;
3189                         }
3190
3191                 ssl_set_handshake_header(s, SSL3_MT_CLIENT_KEY_EXCHANGE, n);
3192                 s->state=SSL3_ST_CW_KEY_EXCH_B;
3193                 }
3194
3195         /* SSL3_ST_CW_KEY_EXCH_B */
3196         return ssl_do_write(s);
3197 err:
3198 #ifndef OPENSSL_NO_ECDH
3199         BN_CTX_free(bn_ctx);
3200         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
3201         if (clnt_ecdh != NULL)
3202                 EC_KEY_free(clnt_ecdh);
3203         EVP_PKEY_free(srvr_pub_pkey);
3204 #endif
3205         return(-1);
3206         }
3207
3208 int ssl3_send_client_verify(SSL *s)
3209         {
3210         unsigned char *p;
3211         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
3212         EVP_PKEY *pkey;
3213         EVP_PKEY_CTX *pctx=NULL;
3214         EVP_MD_CTX mctx;
3215         unsigned u=0;
3216         unsigned long n;
3217         int j;
3218
3219         EVP_MD_CTX_init(&mctx);
3220
3221         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
3222                 {
3223                 p= ssl_handshake_start(s);
3224                 pkey=s->cert->key->privatekey;
3225 /* Create context from key and test if sha1 is allowed as digest */
3226                 pctx = EVP_PKEY_CTX_new(pkey,NULL);
3227                 EVP_PKEY_sign_init(pctx);
3228                 if (EVP_PKEY_CTX_set_signature_md(pctx, EVP_sha1())>0)
3229                         {
3230                         if (!SSL_USE_SIGALGS(s))
3231                                 s->method->ssl3_enc->cert_verify_mac(s,
3232                                                 NID_sha1,
3233                                                 &(data[MD5_DIGEST_LENGTH]));
3234                         }
3235                 else
3236                         {
3237                         ERR_clear_error();
3238                         }
3239                 /* For TLS v1.2 send signature algorithm and signature
3240                  * using agreed digest and cached handshake records.
3241                  */
3242                 if (SSL_USE_SIGALGS(s))
3243                         {
3244                         long hdatalen = 0;
3245                         void *hdata;
3246                         const EVP_MD *md = s->cert->key->digest;
3247                         hdatalen = BIO_get_mem_data(s->s3->handshake_buffer,
3248                                                                 &hdata);
3249                         if (hdatalen <= 0 || !tls12_get_sigandhash(p, pkey, md))
3250                                 {
3251                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3252                                                 ERR_R_INTERNAL_ERROR);
3253                                 goto err;
3254                                 }
3255                         p += 2;
3256 #ifdef SSL_DEBUG
3257                         fprintf(stderr, "Using TLS 1.2 with client alg %s\n",
3258                                                         EVP_MD_name(md));
3259 #endif
3260                         if (!EVP_SignInit_ex(&mctx, md, NULL)
3261                                 || !EVP_SignUpdate(&mctx, hdata, hdatalen)
3262                                 || !EVP_SignFinal(&mctx, p + 2, &u, pkey))
3263                                 {
3264                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3265                                                 ERR_R_EVP_LIB);
3266                                 goto err;
3267                                 }
3268                         s2n(u,p);
3269                         n = u + 4;
3270                         if (!ssl3_digest_cached_records(s))
3271                                 goto err;
3272                         }
3273                 else
3274 #ifndef OPENSSL_NO_RSA
3275                 if (pkey->type == EVP_PKEY_RSA)
3276                         {
3277                         s->method->ssl3_enc->cert_verify_mac(s,
3278                                 NID_md5,
3279                                 &(data[0]));
3280                         if (RSA_sign(NID_md5_sha1, data,
3281                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
3282                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
3283                                 {
3284                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
3285                                 goto err;
3286                                 }
3287                         s2n(u,p);
3288                         n=u+2;
3289                         }
3290                 else
3291 #endif
3292 #ifndef OPENSSL_NO_DSA
3293                         if (pkey->type == EVP_PKEY_DSA)
3294                         {
3295                         if (!DSA_sign(pkey->save_type,
3296                                 &(data[MD5_DIGEST_LENGTH]),
3297                                 SHA_DIGEST_LENGTH,&(p[2]),
3298                                 (unsigned int *)&j,pkey->pkey.dsa))
3299                                 {
3300                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
3301                                 goto err;
3302                                 }
3303                         s2n(j,p);
3304                         n=j+2;
3305                         }
3306                 else
3307 #endif
3308 #ifndef OPENSSL_NO_ECDSA
3309                         if (pkey->type == EVP_PKEY_EC)
3310                         {
3311                         if (!ECDSA_sign(pkey->save_type,
3312                                 &(data[MD5_DIGEST_LENGTH]),
3313                                 SHA_DIGEST_LENGTH,&(p[2]),
3314                                 (unsigned int *)&j,pkey->pkey.ec))
3315                                 {
3316                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3317                                     ERR_R_ECDSA_LIB);
3318                                 goto err;
3319                                 }
3320                         s2n(j,p);
3321                         n=j+2;
3322                         }
3323                 else
3324 #endif
3325                 if (pkey->type == NID_id_GostR3410_94 || pkey->type == NID_id_GostR3410_2001)
3326                 {
3327                 unsigned char signbuf[64];
3328                 int i;
3329                 size_t sigsize=64;
3330                 s->method->ssl3_enc->cert_verify_mac(s,
3331                         NID_id_GostR3411_94,
3332                         data);
3333                 if (EVP_PKEY_sign(pctx, signbuf, &sigsize, data, 32) <= 0) {
3334                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
3335                         ERR_R_INTERNAL_ERROR);
3336                         goto err;
3337                 }
3338                 for (i=63,j=0; i>=0; j++, i--) {
3339                         p[2+j]=signbuf[i];
3340                 }
3341                 s2n(j,p);
3342                 n=j+2;
3343                 }
3344                 else
3345                 {
3346                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
3347                         goto err;
3348                 }
3349                 ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_VERIFY, n);
3350                 s->state=SSL3_ST_CW_CERT_VRFY_B;
3351                 }
3352         EVP_MD_CTX_cleanup(&mctx);
3353         EVP_PKEY_CTX_free(pctx);
3354         return ssl_do_write(s);
3355 err:
3356         EVP_MD_CTX_cleanup(&mctx);
3357         EVP_PKEY_CTX_free(pctx);
3358         return(-1);
3359         }
3360
3361 /* Check a certificate can be used for client authentication. Currently
3362  * check cert exists, if we have a suitable digest for TLS 1.2 if
3363  * static DH client certificates can be used and optionally checks
3364  * suitability for Suite B.
3365  */
3366 static int ssl3_check_client_certificate(SSL *s)
3367         {
3368         unsigned long alg_k;
3369         if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
3370                 return 0;
3371         /* If no suitable signature algorithm can't use certificate */
3372         if (SSL_USE_SIGALGS(s) && !s->cert->key->digest)
3373                 return 0;
3374         /* If strict mode check suitability of chain before using it.
3375          * This also adjusts suite B digest if necessary.
3376          */
3377         if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
3378                 !tls1_check_chain(s, NULL, NULL, NULL, -2))
3379                 return 0;
3380         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3381         /* See if we can use client certificate for fixed DH */
3382         if (alg_k & (SSL_kDHr|SSL_kDHd))
3383                 {
3384                 SESS_CERT *scert = s->session->sess_cert;
3385                 int i = scert->peer_cert_type;
3386                 EVP_PKEY *clkey = NULL, *spkey = NULL;
3387                 clkey = s->cert->key->privatekey;
3388                 /* If client key not DH assume it can be used */
3389                 if (EVP_PKEY_id(clkey) != EVP_PKEY_DH)
3390                         return 1;
3391                 if (i >= 0)
3392                         spkey = X509_get_pubkey(scert->peer_pkeys[i].x509);
3393                 if (spkey)
3394                         {
3395                         /* Compare server and client parameters */
3396                         i = EVP_PKEY_cmp_parameters(clkey, spkey);
3397                         EVP_PKEY_free(spkey);
3398                         if (i != 1)
3399                                 return 0;
3400                         }
3401                 s->s3->flags |= TLS1_FLAGS_SKIP_CERT_VERIFY;
3402                 }
3403         return 1;
3404         }
3405
3406 int ssl3_send_client_certificate(SSL *s)
3407         {
3408         X509 *x509=NULL;
3409         EVP_PKEY *pkey=NULL;
3410         int i;
3411
3412         if (s->state == SSL3_ST_CW_CERT_A)
3413                 {
3414                 /* Let cert callback update client certificates if required */
3415                 if (s->cert->cert_cb)
3416                         {
3417                         i = s->cert->cert_cb(s, s->cert->cert_cb_arg);
3418                         if (i < 0)
3419                                 {
3420                                 s->rwstate=SSL_X509_LOOKUP;
3421                                 return -1;
3422                                 }
3423                         if (i == 0)
3424                                 {
3425                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_INTERNAL_ERROR);
3426                                 return 0;
3427                                 }
3428                         s->rwstate=SSL_NOTHING;
3429                         }
3430                 if (ssl3_check_client_certificate(s))
3431                         s->state=SSL3_ST_CW_CERT_C;
3432                 else
3433                         s->state=SSL3_ST_CW_CERT_B;
3434                 }
3435
3436         /* We need to get a client cert */
3437         if (s->state == SSL3_ST_CW_CERT_B)
3438                 {
3439                 /* If we get an error, we need to
3440                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
3441                  * We then get retied later */
3442                 i=0;
3443                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
3444                 if (i < 0)
3445                         {
3446                         s->rwstate=SSL_X509_LOOKUP;
3447                         return(-1);
3448                         }
3449                 s->rwstate=SSL_NOTHING;
3450                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
3451                         {
3452                         s->state=SSL3_ST_CW_CERT_B;
3453                         if (    !SSL_use_certificate(s,x509) ||
3454                                 !SSL_use_PrivateKey(s,pkey))
3455                                 i=0;
3456                         }
3457                 else if (i == 1)
3458                         {
3459                         i=0;
3460                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
3461                         }
3462
3463                 if (x509 != NULL) X509_free(x509);
3464                 if (pkey != NULL) EVP_PKEY_free(pkey);
3465                 if (i && !ssl3_check_client_certificate(s))
3466                         i = 0;
3467                 if (i == 0)
3468                         {
3469                         if (s->version == SSL3_VERSION)
3470                                 {
3471                                 s->s3->tmp.cert_req=0;
3472                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
3473                                 return(1);
3474                                 }
3475                         else
3476                                 {
3477                                 s->s3->tmp.cert_req=2;
3478                                 }
3479                         }
3480
3481                 /* Ok, we have a cert */
3482                 s->state=SSL3_ST_CW_CERT_C;
3483                 }
3484
3485         if (s->state == SSL3_ST_CW_CERT_C)
3486                 {
3487                 s->state=SSL3_ST_CW_CERT_D;
3488                 ssl3_output_cert_chain(s,
3489                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key);
3490                 }
3491         /* SSL3_ST_CW_CERT_D */
3492         return ssl_do_write(s);
3493         }
3494
3495 #define has_bits(i,m)   (((i)&(m)) == (m))
3496
3497 int ssl3_check_cert_and_algorithm(SSL *s)
3498         {
3499         int i,idx;
3500         long alg_k,alg_a;
3501         EVP_PKEY *pkey=NULL;
3502         SESS_CERT *sc;
3503 #ifndef OPENSSL_NO_RSA
3504         RSA *rsa;
3505 #endif
3506 #ifndef OPENSSL_NO_DH
3507         DH *dh;
3508 #endif
3509
3510         alg_k=s->s3->tmp.new_cipher->algorithm_mkey;
3511         alg_a=s->s3->tmp.new_cipher->algorithm_auth;
3512
3513         /* we don't have a certificate */
3514         if ((alg_a & (SSL_aNULL|SSL_aKRB5)) || (alg_k & SSL_kPSK))
3515                 return(1);
3516
3517         sc=s->session->sess_cert;
3518         if (sc == NULL)
3519                 {
3520                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
3521                 goto err;
3522                 }
3523
3524 #ifndef OPENSSL_NO_RSA
3525         rsa=s->session->sess_cert->peer_rsa_tmp;
3526 #endif
3527 #ifndef OPENSSL_NO_DH
3528         dh=s->session->sess_cert->peer_dh_tmp;
3529 #endif
3530
3531         /* This is the passed certificate */
3532
3533         idx=sc->peer_cert_type;
3534 #ifndef OPENSSL_NO_ECDH
3535         if (idx == SSL_PKEY_ECC)
3536                 {
3537                 if (ssl_check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
3538                                                                 s) == 0)
3539                         { /* check failed */
3540                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
3541                         goto f_err;
3542                         }
3543                 else
3544                         {
3545                         return 1;
3546                         }
3547                 }
3548         else if (alg_a & SSL_aECDSA)
3549                 {
3550                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDSA_SIGNING_CERT);
3551                 goto f_err;
3552                 }
3553         else if (alg_k & (SSL_kECDHr|SSL_kECDHe))
3554                 {
3555                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_ECDH_CERT);
3556                 goto f_err;
3557                 }
3558 #endif
3559         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
3560         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
3561         EVP_PKEY_free(pkey);
3562
3563
3564         /* Check that we have a certificate if we require one */
3565         if ((alg_a & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
3566                 {
3567                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
3568                 goto f_err;
3569                 }
3570 #ifndef OPENSSL_NO_DSA
3571         else if ((alg_a & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
3572                 {
3573                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
3574                 goto f_err;
3575                 }
3576 #endif
3577 #ifndef OPENSSL_NO_RSA
3578         if ((alg_k & SSL_kRSA) &&
3579                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
3580                 {
3581                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
3582                 goto f_err;
3583                 }
3584 #endif
3585 #ifndef OPENSSL_NO_DH
3586         if ((alg_k & SSL_kEDH) &&
3587                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
3588                 {
3589                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
3590                 goto f_err;
3591                 }
3592         else if ((alg_k & SSL_kDHr) && !SSL_USE_SIGALGS(s) &&
3593                 !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
3594                 {
3595                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
3596                 goto f_err;
3597                 }
3598 #ifndef OPENSSL_NO_DSA
3599         else if ((alg_k & SSL_kDHd) && !SSL_USE_SIGALGS(s) &&
3600                 !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
3601                 {
3602                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
3603                 goto f_err;
3604                 }
3605 #endif
3606 #endif
3607
3608         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
3609                 {
3610 #ifndef OPENSSL_NO_RSA
3611                 if (alg_k & SSL_kRSA)
3612                         {
3613                         if (rsa == NULL
3614                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3615                                 {
3616                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
3617                                 goto f_err;
3618                                 }
3619                         }
3620                 else
3621 #endif
3622 #ifndef OPENSSL_NO_DH
3623                         if (alg_k & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
3624                             {
3625                             if (dh == NULL
3626                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
3627                                 {
3628                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
3629                                 goto f_err;
3630                                 }
3631                         }
3632                 else
3633 #endif
3634                         {
3635                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
3636                         goto f_err;
3637                         }
3638                 }
3639         return(1);
3640 f_err:
3641         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
3642 err:
3643         return(0);
3644         }
3645
3646 #if !defined(OPENSSL_NO_TLSEXT) && !defined(OPENSSL_NO_NEXTPROTONEG)
3647 int ssl3_send_next_proto(SSL *s)
3648         {
3649         unsigned int len, padding_len;
3650         unsigned char *d;
3651
3652         if (s->state == SSL3_ST_CW_NEXT_PROTO_A)
3653                 {
3654                 len = s->next_proto_negotiated_len;
3655                 padding_len = 32 - ((len + 2) % 32);
3656                 d = (unsigned char *)s->init_buf->data;
3657                 d[4] = len;
3658                 memcpy(d + 5, s->next_proto_negotiated, len);
3659                 d[5 + len] = padding_len;
3660                 memset(d + 6 + len, 0, padding_len);
3661                 *(d++)=SSL3_MT_NEXT_PROTO;
3662                 l2n3(2 + len + padding_len, d);
3663                 s->state = SSL3_ST_CW_NEXT_PROTO_B;
3664                 s->init_num = 4 + 2 + len + padding_len;
3665                 s->init_off = 0;
3666                 }
3667
3668         return ssl3_do_write(s, SSL3_RT_HANDSHAKE);
3669         }
3670 #endif  /* !OPENSSL_NO_TLSEXT && !OPENSSL_NO_NEXTPROTONEG */
3671
3672 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
3673         {
3674         int i = 0;
3675 #ifndef OPENSSL_NO_ENGINE
3676         if (s->ctx->client_cert_engine)
3677                 {
3678                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
3679                                                 SSL_get_client_CA_list(s),
3680                                                 px509, ppkey, NULL, NULL, NULL);
3681                 if (i != 0)
3682                         return i;
3683                 }
3684 #endif
3685         if (s->ctx->client_cert_cb)
3686                 i = s->ctx->client_cert_cb(s,px509,ppkey);
3687         return i;
3688         }