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