crypto/openssl/ssl/s3_clnt.c

   1 /* ssl/s3_clnt.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2003 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 #include <stdio.h>
 126 #include "ssl_locl.h"
 127 #include "kssl_lcl.h"
 128 #include <openssl/buffer.h>
 129 #include <openssl/rand.h>
 130 #include <openssl/objects.h>
 131 #include <openssl/evp.h>
 132 #include <openssl/md5.h>
 133 #ifdef OPENSSL_FIPS
 134 #include <openssl/fips.h>
 135 #endif
 136
 137 #ifndef OPENSSL_NO_DH
 138 #include <openssl/dh.h>
 139 #endif
 140 #include <openssl/bn.h>
 141 #ifndef OPENSSL_NO_ENGINE
 142 #include <openssl/engine.h>
 143 #endif
 144
 145 static SSL_METHOD *ssl3_get_client_method(int ver);
 146 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 147
 148 #ifndef OPENSSL_NO_ECDH
 149 static int curve_id2nid(int curve_id);
 150 int check_srvr_ecc_cert_and_alg(X509 *x, SSL_CIPHER *cs);
 151 #endif
 152
 153 static SSL_METHOD *ssl3_get_client_method(int ver)
 154         {
 155         if (ver == SSL3_VERSION)
 156                 return(SSLv3_client_method());
 157         else
 158                 return(NULL);
 159         }
 160
 161 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 162                         ssl_undefined_function,
 163                         ssl3_connect,
 164                         ssl3_get_client_method)
 165
 166 int ssl3_connect(SSL *s)
 167         {
 168         BUF_MEM *buf=NULL;
 169         unsigned long Time=(unsigned long)time(NULL);
 170         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 171         int ret= -1;
 172         int new_state,state,skip=0;
 173
 174         RAND_add(&Time,sizeof(Time),0);
 175         ERR_clear_error();
 176         clear_sys_error();
 177
 178         if (s->info_callback != NULL)
 179                 cb=s->info_callback;
 180         else if (s->ctx->info_callback != NULL)
 181                 cb=s->ctx->info_callback;
 182
 183         s->in_handshake++;
 184         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 185
 186         for (;;)
 187                 {
 188                 state=s->state;
 189
 190                 switch(s->state)
 191                         {
 192                 case SSL_ST_RENEGOTIATE:
 193                         s->new_session=1;
 194                         s->state=SSL_ST_CONNECT;
 195                         s->ctx->stats.sess_connect_renegotiate++;
 196                         /* break */
 197                 case SSL_ST_BEFORE:
 198                 case SSL_ST_CONNECT:
 199                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 200                 case SSL_ST_OK|SSL_ST_CONNECT:
 201
 202                         s->server=0;
 203                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 204
 205                         if ((s->version & 0xff00 ) != 0x0300)
 206                                 {
 207                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 208                                 ret = -1;
 209                                 goto end;
 210                                 }
 211
 212                         /* s->version=SSL3_VERSION; */
 213                         s->type=SSL_ST_CONNECT;
 214
 215                         if (s->init_buf == NULL)
 216                                 {
 217                                 if ((buf=BUF_MEM_new()) == NULL)
 218                                         {
 219                                         ret= -1;
 220                                         goto end;
 221                                         }
 222                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 223                                         {
 224                                         ret= -1;
 225                                         goto end;
 226                                         }
 227                                 s->init_buf=buf;
 228                                 buf=NULL;
 229                                 }
 230
 231                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 232
 233                         /* setup buffing BIO */
 234                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 235
 236                         /* don't push the buffering BIO quite yet */
 237
 238                         ssl3_init_finished_mac(s);
 239
 240                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 241                         s->ctx->stats.sess_connect++;
 242                         s->init_num=0;
 243                         break;
 244
 245                 case SSL3_ST_CW_CLNT_HELLO_A:
 246                 case SSL3_ST_CW_CLNT_HELLO_B:
 247
 248                         s->shutdown=0;
 249                         ret=ssl3_client_hello(s);
 250                         if (ret <= 0) goto end;
 251                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 252                         s->init_num=0;
 253
 254                         /* turn on buffering for the next lot of output */
 255                         if (s->bbio != s->wbio)
 256                                 s->wbio=BIO_push(s->bbio,s->wbio);
 257
 258                         break;
 259
 260                 case SSL3_ST_CR_SRVR_HELLO_A:
 261                 case SSL3_ST_CR_SRVR_HELLO_B:
 262                         ret=ssl3_get_server_hello(s);
 263                         if (ret <= 0) goto end;
 264                         if (s->hit)
 265                                 {
 266                                 s->state=SSL3_ST_CR_FINISHED_A;
 267 #ifndef OPENSSL_NO_TLSEXT
 268                                 if (s->tlsext_ticket_expected)
 269                                         {
 270                                         /* receive renewed session ticket */
 271                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 272                                         }
 273 #endif
 274                                 }
 275                         else
 276                                 s->state=SSL3_ST_CR_CERT_A;
 277                         s->init_num=0;
 278                         break;
 279
 280                 case SSL3_ST_CR_CERT_A:
 281                 case SSL3_ST_CR_CERT_B:
 282 #ifndef OPENSSL_NO_TLSEXT
 283                         ret=ssl3_check_finished(s);
 284                         if (ret <= 0) goto end;
 285                         if (ret == 2)
 286                                 {
 287                                 s->hit = 1;
 288                                 if (s->tlsext_ticket_expected)
 289                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 290                                 else
 291                                         s->state=SSL3_ST_CR_FINISHED_A;
 292                                 s->init_num=0;
 293                                 break;
 294                                 }
 295 #endif
 296                         /* Check if it is anon DH/ECDH */
 297                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 298                                 {
 299                                 ret=ssl3_get_server_certificate(s);
 300                                 if (ret <= 0) goto end;
 301 #ifndef OPENSSL_NO_TLSEXT
 302                                 if (s->tlsext_status_expected)
 303                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 304                                 else
 305                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 306                                 }
 307                         else
 308                                 {
 309                                 skip = 1;
 310                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 311                                 }
 312 #else
 313                                 }
 314                         else
 315                                 skip=1;
 316
 317                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 318 #endif
 319                         s->init_num=0;
 320                         break;
 321
 322                 case SSL3_ST_CR_KEY_EXCH_A:
 323                 case SSL3_ST_CR_KEY_EXCH_B:
 324                         ret=ssl3_get_key_exchange(s);
 325                         if (ret <= 0) goto end;
 326                         s->state=SSL3_ST_CR_CERT_REQ_A;
 327                         s->init_num=0;
 328
 329                         /* at this point we check that we have the
 330                          * required stuff from the server */
 331                         if (!ssl3_check_cert_and_algorithm(s))
 332                                 {
 333                                 ret= -1;
 334                                 goto end;
 335                                 }
 336                         break;
 337
 338                 case SSL3_ST_CR_CERT_REQ_A:
 339                 case SSL3_ST_CR_CERT_REQ_B:
 340                         ret=ssl3_get_certificate_request(s);
 341                         if (ret <= 0) goto end;
 342                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 343                         s->init_num=0;
 344                         break;
 345
 346                 case SSL3_ST_CR_SRVR_DONE_A:
 347                 case SSL3_ST_CR_SRVR_DONE_B:
 348                         ret=ssl3_get_server_done(s);
 349                         if (ret <= 0) goto end;
 350                         if (s->s3->tmp.cert_req)
 351                                 s->state=SSL3_ST_CW_CERT_A;
 352                         else
 353                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 354                         s->init_num=0;
 355
 356                         break;
 357
 358                 case SSL3_ST_CW_CERT_A:
 359                 case SSL3_ST_CW_CERT_B:
 360                 case SSL3_ST_CW_CERT_C:
 361                 case SSL3_ST_CW_CERT_D:
 362                         ret=ssl3_send_client_certificate(s);
 363                         if (ret <= 0) goto end;
 364                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 365                         s->init_num=0;
 366                         break;
 367
 368                 case SSL3_ST_CW_KEY_EXCH_A:
 369                 case SSL3_ST_CW_KEY_EXCH_B:
 370                         ret=ssl3_send_client_key_exchange(s);
 371                         if (ret <= 0) goto end;
 372                         /* EAY EAY EAY need to check for DH fix cert
 373                          * sent back */
 374                         /* For TLS, cert_req is set to 2, so a cert chain
 375                          * of nothing is sent, but no verify packet is sent */
 376                         /* XXX: For now, we do not support client
 377                          * authentication in ECDH cipher suites with
 378                          * ECDH (rather than ECDSA) certificates.
 379                          * We need to skip the certificate verify
 380                          * message when client's ECDH public key is sent
 381                          * inside the client certificate.
 382                          */
 383                         if (s->s3->tmp.cert_req == 1)
 384                                 {
 385                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 386                                 }
 387                         else
 388                                 {
 389                                 s->state=SSL3_ST_CW_CHANGE_A;
 390                                 s->s3->change_cipher_spec=0;
 391                                 }
 392
 393                         s->init_num=0;
 394                         break;
 395
 396                 case SSL3_ST_CW_CERT_VRFY_A:
 397                 case SSL3_ST_CW_CERT_VRFY_B:
 398                         ret=ssl3_send_client_verify(s);
 399                         if (ret <= 0) goto end;
 400                         s->state=SSL3_ST_CW_CHANGE_A;
 401                         s->init_num=0;
 402                         s->s3->change_cipher_spec=0;
 403                         break;
 404
 405                 case SSL3_ST_CW_CHANGE_A:
 406                 case SSL3_ST_CW_CHANGE_B:
 407                         ret=ssl3_send_change_cipher_spec(s,
 408                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 409                         if (ret <= 0) goto end;
 410                         s->state=SSL3_ST_CW_FINISHED_A;
 411                         s->init_num=0;
 412
 413                         s->session->cipher=s->s3->tmp.new_cipher;
 414 #ifdef OPENSSL_NO_COMP
 415                         s->session->compress_meth=0;
 416 #else
 417                         if (s->s3->tmp.new_compression == NULL)
 418                                 s->session->compress_meth=0;
 419                         else
 420                                 s->session->compress_meth=
 421                                         s->s3->tmp.new_compression->id;
 422 #endif
 423                         if (!s->method->ssl3_enc->setup_key_block(s))
 424                                 {
 425                                 ret= -1;
 426                                 goto end;
 427                                 }
 428
 429                         if (!s->method->ssl3_enc->change_cipher_state(s,
 430                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 431                                 {
 432                                 ret= -1;
 433                                 goto end;
 434                                 }
 435
 436                         break;
 437
 438                 case SSL3_ST_CW_FINISHED_A:
 439                 case SSL3_ST_CW_FINISHED_B:
 440                         ret=ssl3_send_finished(s,
 441                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 442                                 s->method->ssl3_enc->client_finished_label,
 443                                 s->method->ssl3_enc->client_finished_label_len);
 444                         if (ret <= 0) goto end;
 445                         s->state=SSL3_ST_CW_FLUSH;
 446
 447                         /* clear flags */
 448                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 449                         if (s->hit)
 450                                 {
 451                                 s->s3->tmp.next_state=SSL_ST_OK;
 452                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 453                                         {
 454                                         s->state=SSL_ST_OK;
 455                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 456                                         s->s3->delay_buf_pop_ret=0;
 457                                         }
 458                                 }
 459                         else
 460                                 {
 461 #ifndef OPENSSL_NO_TLSEXT
 462                                 /* Allow NewSessionTicket if ticket expected */
 463                                 if (s->tlsext_ticket_expected)
 464                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 465                                 else
 466 #endif
 467
 468                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 469                                 }
 470                         s->init_num=0;
 471                         break;
 472
 473 #ifndef OPENSSL_NO_TLSEXT
 474                 case SSL3_ST_CR_SESSION_TICKET_A:
 475                 case SSL3_ST_CR_SESSION_TICKET_B:
 476                         ret=ssl3_get_new_session_ticket(s);
 477                         if (ret <= 0) goto end;
 478                         s->state=SSL3_ST_CR_FINISHED_A;
 479                         s->init_num=0;
 480                 break;
 481
 482                 case SSL3_ST_CR_CERT_STATUS_A:
 483                 case SSL3_ST_CR_CERT_STATUS_B:
 484                         ret=ssl3_get_cert_status(s);
 485                         if (ret <= 0) goto end;
 486                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 487                         s->init_num=0;
 488                 break;
 489 #endif
 490
 491                 case SSL3_ST_CR_FINISHED_A:
 492                 case SSL3_ST_CR_FINISHED_B:
 493
 494                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 495                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 496                                 SSL3_ST_CR_FINISHED_B);
 497                         if (ret <= 0) goto end;
 498
 499                         if (s->hit)
 500                                 s->state=SSL3_ST_CW_CHANGE_A;
 501                         else
 502                                 s->state=SSL_ST_OK;
 503                         s->init_num=0;
 504                         break;
 505
 506                 case SSL3_ST_CW_FLUSH:
 507                         s->rwstate=SSL_WRITING;
 508                         if (BIO_flush(s->wbio) <= 0)
 509                                 {
 510                                 ret= -1;
 511                                 goto end;
 512                                 }
 513                         s->rwstate=SSL_NOTHING;
 514                         s->state=s->s3->tmp.next_state;
 515                         break;
 516
 517                 case SSL_ST_OK:
 518                         /* clean a few things up */
 519                         ssl3_cleanup_key_block(s);
 520
 521                         if (s->init_buf != NULL)
 522                                 {
 523                                 BUF_MEM_free(s->init_buf);
 524                                 s->init_buf=NULL;
 525                                 }
 526
 527                         /* If we are not 'joining' the last two packets,
 528                          * remove the buffering now */
 529                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 530                                 ssl_free_wbio_buffer(s);
 531                         /* else do it later in ssl3_write */
 532
 533                         s->init_num=0;
 534                         s->new_session=0;
 535
 536                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 537                         if (s->hit) s->ctx->stats.sess_hit++;
 538
 539                         ret=1;
 540                         /* s->server=0; */
 541                         s->handshake_func=ssl3_connect;
 542                         s->ctx->stats.sess_connect_good++;
 543
 544                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 545
 546                         goto end;
 547                         /* break; */
 548
 549                 default:
 550                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 551                         ret= -1;
 552                         goto end;
 553                         /* break; */
 554                         }
 555
 556                 /* did we do anything */
 557                 if (!s->s3->tmp.reuse_message && !skip)
 558                         {
 559                         if (s->debug)
 560                                 {
 561                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 562                                         goto end;
 563                                 }
 564
 565                         if ((cb != NULL) && (s->state != state))
 566                                 {
 567                                 new_state=s->state;
 568                                 s->state=state;
 569                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 570                                 s->state=new_state;
 571                                 }
 572                         }
 573                 skip=0;
 574                 }
 575 end:
 576         s->in_handshake--;
 577         if (buf != NULL)
 578                 BUF_MEM_free(buf);
 579         if (cb != NULL)
 580                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 581         return(ret);
 582         }
 583
 584
 585 int ssl3_client_hello(SSL *s)
 586         {
 587         unsigned char *buf;
 588         unsigned char *p,*d;
 589         int i;
 590         unsigned long Time,l;
 591 #ifndef OPENSSL_NO_COMP
 592         int j;
 593         SSL_COMP *comp;
 594 #endif
 595
 596         buf=(unsigned char *)s->init_buf->data;
 597         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 598                 {
 599                 SSL_SESSION *sess = s->session;
 600                 if ((sess == NULL) ||
 601                         (sess->ssl_version != s->version) ||
 602 #ifdef OPENSSL_NO_TLSEXT
 603                         !sess->session_id_length ||
 604 #else
 605                         (!sess->session_id_length && !sess->tlsext_tick) ||
 606 #endif
 607                         (sess->not_resumable))
 608                         {
 609                         if (!ssl_get_new_session(s,0))
 610                                 goto err;
 611                         }
 612                 /* else use the pre-loaded session */
 613
 614                 p=s->s3->client_random;
 615                 Time=(unsigned long)time(NULL);                 /* Time */
 616                 l2n(Time,p);
 617                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 618                         goto err;
 619
 620                 /* Do the message type and length last */
 621                 d=p= &(buf[4]);
 622
 623                 *(p++)=s->version>>8;
 624                 *(p++)=s->version&0xff;
 625                 s->client_version=s->version;
 626
 627                 /* Random stuff */
 628                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 629                 p+=SSL3_RANDOM_SIZE;
 630
 631                 /* Session ID */
 632                 if (s->new_session)
 633                         i=0;
 634                 else
 635                         i=s->session->session_id_length;
 636                 *(p++)=i;
 637                 if (i != 0)
 638                         {
 639                         if (i > (int)sizeof(s->session->session_id))
 640                                 {
 641                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 642                                 goto err;
 643                                 }
 644                         memcpy(p,s->session->session_id,i);
 645                         p+=i;
 646                         }
 647
 648                 /* Ciphers supported */
 649                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 650                 if (i == 0)
 651                         {
 652                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 653                         goto err;
 654                         }
 655                 s2n(i,p);
 656                 p+=i;
 657
 658                 /* COMPRESSION */
 659 #ifdef OPENSSL_NO_COMP
 660                 *(p++)=1;
 661 #else
 662                 if (s->ctx->comp_methods == NULL)
 663                         j=0;
 664                 else
 665                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 666                 *(p++)=1+j;
 667                 for (i=0; i<j; i++)
 668                         {
 669                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 670                         *(p++)=comp->id;
 671                         }
 672 #endif
 673                 *(p++)=0; /* Add the NULL method */
 674 #ifndef OPENSSL_NO_TLSEXT
 675                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 676                         {
 677                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 678                         goto err;
 679                         }
 680 #endif
 681                 l=(p-d);
 682                 d=buf;
 683                 *(d++)=SSL3_MT_CLIENT_HELLO;
 684                 l2n3(l,d);
 685
 686                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 687                 /* number of bytes to write */
 688                 s->init_num=p-buf;
 689                 s->init_off=0;
 690                 }
 691
 692         /* SSL3_ST_CW_CLNT_HELLO_B */
 693         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 694 err:
 695         return(-1);
 696         }
 697
 698 int ssl3_get_server_hello(SSL *s)
 699         {
 700         STACK_OF(SSL_CIPHER) *sk;
 701         SSL_CIPHER *c;
 702         unsigned char *p,*d;
 703         int i,al,ok;
 704         unsigned int j;
 705         long n;
 706 #ifndef OPENSSL_NO_COMP
 707         SSL_COMP *comp;
 708 #endif
 709
 710         n=s->method->ssl_get_message(s,
 711                 SSL3_ST_CR_SRVR_HELLO_A,
 712                 SSL3_ST_CR_SRVR_HELLO_B,
 713                 -1,
 714                 20000, /* ?? */
 715                 &ok);
 716
 717         if (!ok) return((int)n);
 718
 719         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 720                 {
 721                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 722                         {
 723                         if ( s->d1->send_cookie == 0)
 724                                 {
 725                                 s->s3->tmp.reuse_message = 1;
 726                                 return 1;
 727                                 }
 728                         else /* already sent a cookie */
 729                                 {
 730                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 731                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 732                                 goto f_err;
 733                                 }
 734                         }
 735                 }
 736
 737         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 738                 {
 739                 al=SSL_AD_UNEXPECTED_MESSAGE;
 740                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 741                 goto f_err;
 742                 }
 743
 744         d=p=(unsigned char *)s->init_msg;
 745
 746         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 747                 {
 748                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 749                 s->version=(s->version&0xff00)|p[1];
 750                 al=SSL_AD_PROTOCOL_VERSION;
 751                 goto f_err;
 752                 }
 753         p+=2;
 754
 755         /* load the server hello data */
 756         /* load the server random */
 757         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 758         p+=SSL3_RANDOM_SIZE;
 759
 760         /* get the session-id */
 761         j= *(p++);
 762
 763         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 764                 {
 765                 al=SSL_AD_ILLEGAL_PARAMETER;
 766                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 767                 goto f_err;
 768                 }
 769
 770         if (j != 0 && j == s->session->session_id_length
 771             && memcmp(p,s->session->session_id,j) == 0)
 772             {
 773             if(s->sid_ctx_length != s->session->sid_ctx_length
 774                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 775                 {
 776                 /* actually a client application bug */
 777                 al=SSL_AD_ILLEGAL_PARAMETER;
 778                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 779                 goto f_err;
 780                 }
 781             s->s3->flags |= SSL3_FLAGS_CCS_OK;
 782             s->hit=1;
 783             }
 784         else    /* a miss or crap from the other end */
 785                 {
 786                 /* If we were trying for session-id reuse, make a new
 787                  * SSL_SESSION so we don't stuff up other people */
 788                 s->hit=0;
 789                 if (s->session->session_id_length > 0)
 790                         {
 791                         if (!ssl_get_new_session(s,0))
 792                                 {
 793                                 al=SSL_AD_INTERNAL_ERROR;
 794                                 goto f_err;
 795                                 }
 796                         }
 797                 s->session->session_id_length=j;
 798                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 799                 }
 800         p+=j;
 801         c=ssl_get_cipher_by_char(s,p);
 802         if (c == NULL)
 803                 {
 804                 /* unknown cipher */
 805                 al=SSL_AD_ILLEGAL_PARAMETER;
 806                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 807                 goto f_err;
 808                 }
 809         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 810
 811         sk=ssl_get_ciphers_by_id(s);
 812         i=sk_SSL_CIPHER_find(sk,c);
 813         if (i < 0)
 814                 {
 815                 /* we did not say we would use this cipher */
 816                 al=SSL_AD_ILLEGAL_PARAMETER;
 817                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 818                 goto f_err;
 819                 }
 820
 821         /* Depending on the session caching (internal/external), the cipher
 822            and/or cipher_id values may not be set. Make sure that
 823            cipher_id is set and use it for comparison. */
 824         if (s->session->cipher)
 825                 s->session->cipher_id = s->session->cipher->id;
 826         if (s->hit && (s->session->cipher_id != c->id))
 827                 {
 828 /* Workaround is now obsolete */
 829 #if 0
 830                 if (!(s->options &
 831                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 832 #endif
 833                         {
 834                         al=SSL_AD_ILLEGAL_PARAMETER;
 835                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 836                         goto f_err;
 837                         }
 838                 }
 839         s->s3->tmp.new_cipher=c;
 840
 841         /* lets get the compression algorithm */
 842         /* COMPRESSION */
 843 #ifdef OPENSSL_NO_COMP
 844         if (*(p++) != 0)
 845                 {
 846                 al=SSL_AD_ILLEGAL_PARAMETER;
 847                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 848                 goto f_err;
 849                 }
 850 #else
 851         j= *(p++);
 852         if (j == 0)
 853                 comp=NULL;
 854         else
 855                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 856
 857         if ((j != 0) && (comp == NULL))
 858                 {
 859                 al=SSL_AD_ILLEGAL_PARAMETER;
 860                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 861                 goto f_err;
 862                 }
 863         else
 864                 {
 865                 s->s3->tmp.new_compression=comp;
 866                 }
 867 #endif
 868 #ifndef OPENSSL_NO_TLSEXT
 869         /* TLS extensions*/
 870         if (s->version >= SSL3_VERSION)
 871                 {
 872                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
 873                         {
 874                         /* 'al' set by ssl_parse_serverhello_tlsext */
 875                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
 876                         goto f_err;
 877                         }
 878                 if (ssl_check_serverhello_tlsext(s) <= 0)
 879                         {
 880                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
 881                                 goto err;
 882                         }
 883                 }
 884 #endif
 885
 886
 887         if (p != (d+n))
 888                 {
 889                 /* wrong packet length */
 890                 al=SSL_AD_DECODE_ERROR;
 891                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 892                 goto f_err;
 893                 }
 894
 895         return(1);
 896 f_err:
 897         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 898 #ifndef OPENSSL_NO_TLSEXT
 899 err:
 900 #endif
 901         return(-1);
 902         }
 903
 904 int ssl3_get_server_certificate(SSL *s)
 905         {
 906         int al,i,ok,ret= -1;
 907         unsigned long n,nc,llen,l;
 908         X509 *x=NULL;
 909         const unsigned char *q,*p;
 910         unsigned char *d;
 911         STACK_OF(X509) *sk=NULL;
 912         SESS_CERT *sc;
 913         EVP_PKEY *pkey=NULL;
 914         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 915
 916         n=s->method->ssl_get_message(s,
 917                 SSL3_ST_CR_CERT_A,
 918                 SSL3_ST_CR_CERT_B,
 919                 -1,
 920                 s->max_cert_list,
 921                 &ok);
 922
 923         if (!ok) return((int)n);
 924
 925         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
 926                 ((s->s3->tmp.new_cipher->algorithms & SSL_aKRB5) &&
 927                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
 928                 {
 929                 s->s3->tmp.reuse_message=1;
 930                 return(1);
 931                 }
 932
 933         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 934                 {
 935                 al=SSL_AD_UNEXPECTED_MESSAGE;
 936                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 937                 goto f_err;
 938                 }
 939         p=d=(unsigned char *)s->init_msg;
 940
 941         if ((sk=sk_X509_new_null()) == NULL)
 942                 {
 943                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 944                 goto err;
 945                 }
 946
 947         n2l3(p,llen);
 948         if (llen+3 != n)
 949                 {
 950                 al=SSL_AD_DECODE_ERROR;
 951                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 952                 goto f_err;
 953                 }
 954         for (nc=0; nc<llen; )
 955                 {
 956                 n2l3(p,l);
 957                 if ((l+nc+3) > llen)
 958                         {
 959                         al=SSL_AD_DECODE_ERROR;
 960                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 961                         goto f_err;
 962                         }
 963
 964                 q=p;
 965                 x=d2i_X509(NULL,&q,l);
 966                 if (x == NULL)
 967                         {
 968                         al=SSL_AD_BAD_CERTIFICATE;
 969                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 970                         goto f_err;
 971                         }
 972                 if (q != (p+l))
 973                         {
 974                         al=SSL_AD_DECODE_ERROR;
 975                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 976                         goto f_err;
 977                         }
 978                 if (!sk_X509_push(sk,x))
 979                         {
 980                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 981                         goto err;
 982                         }
 983                 x=NULL;
 984                 nc+=l+3;
 985                 p=q;
 986                 }
 987
 988         i=ssl_verify_cert_chain(s,sk);
 989         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
 990 #ifndef OPENSSL_NO_KRB5
 991                 && (s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 992                 != (SSL_aKRB5|SSL_kKRB5)
 993 #endif /* OPENSSL_NO_KRB5 */
 994                 )
 995                 {
 996                 al=ssl_verify_alarm_type(s->verify_result);
 997                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 998                 goto f_err;
 999                 }
1000         ERR_clear_error(); /* but we keep s->verify_result */
1001
1002         sc=ssl_sess_cert_new();
1003         if (sc == NULL) goto err;
1004
1005         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1006         s->session->sess_cert=sc;
1007
1008         sc->cert_chain=sk;
1009         /* Inconsistency alert: cert_chain does include the peer's
1010          * certificate, which we don't include in s3_srvr.c */
1011         x=sk_X509_value(sk,0);
1012         sk=NULL;
1013         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1014
1015         pkey=X509_get_pubkey(x);
1016
1017         /* VRS: allow null cert if auth == KRB5 */
1018         need_cert =     ((s->s3->tmp.new_cipher->algorithms
1019                          & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1020                          == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
1021
1022 #ifdef KSSL_DEBUG
1023         printf("pkey,x = %p, %p\n", (void *)pkey,(void *)x);
1024         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1025         printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
1026                 s->s3->tmp.new_cipher->algorithms, need_cert);
1027 #endif    /* KSSL_DEBUG */
1028
1029         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1030                 {
1031                 x=NULL;
1032                 al=SSL3_AL_FATAL;
1033                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1034                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1035                 goto f_err;
1036                 }
1037
1038         i=ssl_cert_type(x,pkey);
1039         if (need_cert && i < 0)
1040                 {
1041                 x=NULL;
1042                 al=SSL3_AL_FATAL;
1043                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1044                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1045                 goto f_err;
1046                 }
1047
1048         if (need_cert)
1049                 {
1050                 sc->peer_cert_type=i;
1051                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1052                 /* Why would the following ever happen?
1053                  * We just created sc a couple of lines ago. */
1054                 if (sc->peer_pkeys[i].x509 != NULL)
1055                         X509_free(sc->peer_pkeys[i].x509);
1056                 sc->peer_pkeys[i].x509=x;
1057                 sc->peer_key= &(sc->peer_pkeys[i]);
1058
1059                 if (s->session->peer != NULL)
1060                         X509_free(s->session->peer);
1061                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1062                 s->session->peer=x;
1063                 }
1064         else
1065                 {
1066                 sc->peer_cert_type=i;
1067                 sc->peer_key= NULL;
1068
1069                 if (s->session->peer != NULL)
1070                         X509_free(s->session->peer);
1071                 s->session->peer=NULL;
1072                 }
1073         s->session->verify_result = s->verify_result;
1074
1075         x=NULL;
1076         ret=1;
1077
1078         if (0)
1079                 {
1080 f_err:
1081                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1082                 }
1083 err:
1084         EVP_PKEY_free(pkey);
1085         X509_free(x);
1086         sk_X509_pop_free(sk,X509_free);
1087         return(ret);
1088         }
1089
1090 int ssl3_get_key_exchange(SSL *s)
1091         {
1092 #ifndef OPENSSL_NO_RSA
1093         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1094 #endif
1095         EVP_MD_CTX md_ctx;
1096         unsigned char *param,*p;
1097         int al,i,j,param_len,ok;
1098         long n,alg;
1099         EVP_PKEY *pkey=NULL;
1100 #ifndef OPENSSL_NO_RSA
1101         RSA *rsa=NULL;
1102 #endif
1103 #ifndef OPENSSL_NO_DH
1104         DH *dh=NULL;
1105 #endif
1106 #ifndef OPENSSL_NO_ECDH
1107         EC_KEY *ecdh = NULL;
1108         BN_CTX *bn_ctx = NULL;
1109         EC_POINT *srvr_ecpoint = NULL;
1110         int curve_nid = 0;
1111         int encoded_pt_len = 0;
1112 #endif
1113
1114         /* use same message size as in ssl3_get_certificate_request()
1115          * as ServerKeyExchange message may be skipped */
1116         n=s->method->ssl_get_message(s,
1117                 SSL3_ST_CR_KEY_EXCH_A,
1118                 SSL3_ST_CR_KEY_EXCH_B,
1119                 -1,
1120                 s->max_cert_list,
1121                 &ok);
1122
1123         if (!ok) return((int)n);
1124
1125         alg=s->s3->tmp.new_cipher->algorithms;
1126         EVP_MD_CTX_init(&md_ctx);
1127
1128         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1129                 {
1130                 /*
1131                  * Can't skip server key exchange if this is an ephemeral
1132                  * ciphersuite.
1133                  */
1134                 if (alg & (SSL_kEDH|SSL_kECDHE))
1135                         {
1136                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1137                         al = SSL_AD_UNEXPECTED_MESSAGE;
1138                         goto f_err;
1139                         }
1140                 s->s3->tmp.reuse_message=1;
1141                 return(1);
1142                 }
1143
1144         param=p=(unsigned char *)s->init_msg;
1145
1146         if (s->session->sess_cert != NULL)
1147                 {
1148 #ifndef OPENSSL_NO_RSA
1149                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1150                         {
1151                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1152                         s->session->sess_cert->peer_rsa_tmp=NULL;
1153                         }
1154 #endif
1155 #ifndef OPENSSL_NO_DH
1156                 if (s->session->sess_cert->peer_dh_tmp)
1157                         {
1158                         DH_free(s->session->sess_cert->peer_dh_tmp);
1159                         s->session->sess_cert->peer_dh_tmp=NULL;
1160                         }
1161 #endif
1162 #ifndef OPENSSL_NO_ECDH
1163                 if (s->session->sess_cert->peer_ecdh_tmp)
1164                         {
1165                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1166                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1167                         }
1168 #endif
1169                 }
1170         else
1171                 {
1172                 s->session->sess_cert=ssl_sess_cert_new();
1173                 }
1174
1175         param_len=0;
1176
1177 #ifndef OPENSSL_NO_RSA
1178         if (alg & SSL_kRSA)
1179                 {
1180                 /* Temporary RSA keys only allowed in export ciphersuites */
1181                 if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher))
1182                         {
1183                         al=SSL_AD_UNEXPECTED_MESSAGE;
1184                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1185                         goto f_err;
1186                         }
1187                 if ((rsa=RSA_new()) == NULL)
1188                         {
1189                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1190                         goto err;
1191                         }
1192                 n2s(p,i);
1193                 param_len=i+2;
1194                 if (param_len > n)
1195                         {
1196                         al=SSL_AD_DECODE_ERROR;
1197                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1198                         goto f_err;
1199                         }
1200                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1201                         {
1202                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1203                         goto err;
1204                         }
1205                 p+=i;
1206
1207                 n2s(p,i);
1208                 param_len+=i+2;
1209                 if (param_len > n)
1210                         {
1211                         al=SSL_AD_DECODE_ERROR;
1212                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1213                         goto f_err;
1214                         }
1215                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1216                         {
1217                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1218                         goto err;
1219                         }
1220                 p+=i;
1221                 n-=param_len;
1222
1223                 /* this should be because we are using an export cipher */
1224                 if (alg & SSL_aRSA)
1225                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1226                 else
1227                         {
1228                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1229                         goto err;
1230                         }
1231                 s->session->sess_cert->peer_rsa_tmp=rsa;
1232                 rsa=NULL;
1233                 }
1234 #else /* OPENSSL_NO_RSA */
1235         if (0)
1236                 ;
1237 #endif
1238 #ifndef OPENSSL_NO_DH
1239         else if (alg & SSL_kEDH)
1240                 {
1241                 if ((dh=DH_new()) == NULL)
1242                         {
1243                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1244                         goto err;
1245                         }
1246                 n2s(p,i);
1247                 param_len=i+2;
1248                 if (param_len > n)
1249                         {
1250                         al=SSL_AD_DECODE_ERROR;
1251                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1252                         goto f_err;
1253                         }
1254                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1255                         {
1256                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1257                         goto err;
1258                         }
1259                 p+=i;
1260
1261                 n2s(p,i);
1262                 param_len+=i+2;
1263                 if (param_len > n)
1264                         {
1265                         al=SSL_AD_DECODE_ERROR;
1266                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1267                         goto f_err;
1268                         }
1269                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1270                         {
1271                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1272                         goto err;
1273                         }
1274                 p+=i;
1275
1276                 n2s(p,i);
1277                 param_len+=i+2;
1278                 if (param_len > n)
1279                         {
1280                         al=SSL_AD_DECODE_ERROR;
1281                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1282                         goto f_err;
1283                         }
1284                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1285                         {
1286                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1287                         goto err;
1288                         }
1289                 p+=i;
1290                 n-=param_len;
1291
1292 #ifndef OPENSSL_NO_RSA
1293                 if (alg & SSL_aRSA)
1294                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1295 #else
1296                 if (0)
1297                         ;
1298 #endif
1299 #ifndef OPENSSL_NO_DSA
1300                 else if (alg & SSL_aDSS)
1301                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1302 #endif
1303                 /* else anonymous DH, so no certificate or pkey. */
1304
1305                 s->session->sess_cert->peer_dh_tmp=dh;
1306                 dh=NULL;
1307                 }
1308         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1309                 {
1310                 al=SSL_AD_ILLEGAL_PARAMETER;
1311                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1312                 goto f_err;
1313                 }
1314 #endif /* !OPENSSL_NO_DH */
1315
1316 #ifndef OPENSSL_NO_ECDH
1317         else if (alg & SSL_kECDHE)
1318                 {
1319                 EC_GROUP *ngroup;
1320                 const EC_GROUP *group;
1321
1322                 if ((ecdh=EC_KEY_new()) == NULL)
1323                         {
1324                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1325                         goto err;
1326                         }
1327
1328                 /* Extract elliptic curve parameters and the
1329                  * server's ephemeral ECDH public key.
1330                  * Keep accumulating lengths of various components in
1331                  * param_len and make sure it never exceeds n.
1332                  */
1333
1334                 /* XXX: For now we only support named (not generic) curves
1335                  * and the ECParameters in this case is just three bytes.
1336                  */
1337                 param_len=3;
1338                 if ((param_len > n) ||
1339                     (*p != NAMED_CURVE_TYPE) ||
1340                     ((curve_nid = curve_id2nid(*(p + 2))) == 0))
1341                         {
1342                         al=SSL_AD_INTERNAL_ERROR;
1343                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1344                         goto f_err;
1345                         }
1346
1347                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1348                 if (ngroup == NULL)
1349                         {
1350                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1351                         goto err;
1352                         }
1353                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1354                         {
1355                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1356                         goto err;
1357                         }
1358                 EC_GROUP_free(ngroup);
1359
1360                 group = EC_KEY_get0_group(ecdh);
1361
1362                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1363                     (EC_GROUP_get_degree(group) > 163))
1364                         {
1365                         al=SSL_AD_EXPORT_RESTRICTION;
1366                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1367                         goto f_err;
1368                         }
1369
1370                 p+=3;
1371
1372                 /* Next, get the encoded ECPoint */
1373                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1374                     ((bn_ctx = BN_CTX_new()) == NULL))
1375                         {
1376                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1377                         goto err;
1378                         }
1379
1380                 encoded_pt_len = *p;  /* length of encoded point */
1381                 p+=1;
1382                 param_len += (1 + encoded_pt_len);
1383                 if ((param_len > n) ||
1384                     (EC_POINT_oct2point(group, srvr_ecpoint,
1385                         p, encoded_pt_len, bn_ctx) == 0))
1386                         {
1387                         al=SSL_AD_DECODE_ERROR;
1388                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1389                         goto f_err;
1390                         }
1391
1392                 n-=param_len;
1393                 p+=encoded_pt_len;
1394
1395                 /* The ECC/TLS specification does not mention
1396                  * the use of DSA to sign ECParameters in the server
1397                  * key exchange message. We do support RSA and ECDSA.
1398                  */
1399                 if (0) ;
1400 #ifndef OPENSSL_NO_RSA
1401                 else if (alg & SSL_aRSA)
1402                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1403 #endif
1404 #ifndef OPENSSL_NO_ECDSA
1405                 else if (alg & SSL_aECDSA)
1406                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1407 #endif
1408                 /* else anonymous ECDH, so no certificate or pkey. */
1409                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1410                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1411                 ecdh=NULL;
1412                 BN_CTX_free(bn_ctx);
1413                 bn_ctx = NULL;
1414                 EC_POINT_free(srvr_ecpoint);
1415                 srvr_ecpoint = NULL;
1416                 }
1417         else if (alg & SSL_kECDH)
1418                 {
1419                 al=SSL_AD_UNEXPECTED_MESSAGE;
1420                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1421                 goto f_err;
1422                 }
1423 #endif /* !OPENSSL_NO_ECDH */
1424         if (alg & SSL_aFZA)
1425                 {
1426                 al=SSL_AD_HANDSHAKE_FAILURE;
1427                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1428                 goto f_err;
1429                 }
1430
1431
1432         /* p points to the next byte, there are 'n' bytes left */
1433
1434         /* if it was signed, check the signature */
1435         if (pkey != NULL)
1436                 {
1437                 n2s(p,i);
1438                 n-=2;
1439                 j=EVP_PKEY_size(pkey);
1440
1441                 if ((i != n) || (n > j) || (n <= 0))
1442                         {
1443                         /* wrong packet length */
1444                         al=SSL_AD_DECODE_ERROR;
1445                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1446                         goto f_err;
1447                         }
1448
1449 #ifndef OPENSSL_NO_RSA
1450                 if (pkey->type == EVP_PKEY_RSA)
1451                         {
1452                         int num;
1453
1454                         j=0;
1455                         q=md_buf;
1456                         for (num=2; num > 0; num--)
1457                                 {
1458                                 EVP_MD_CTX_set_flags(&md_ctx,
1459                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1460                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1461                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1462                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1463                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1464                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1465                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1466                                 q+=i;
1467                                 j+=i;
1468                                 }
1469                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1470                                                                 pkey->pkey.rsa);
1471                         if (i < 0)
1472                                 {
1473                                 al=SSL_AD_DECRYPT_ERROR;
1474                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1475                                 goto f_err;
1476                                 }
1477                         if (i == 0)
1478                                 {
1479                                 /* bad signature */
1480                                 al=SSL_AD_DECRYPT_ERROR;
1481                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1482                                 goto f_err;
1483                                 }
1484                         }
1485                 else
1486 #endif
1487 #ifndef OPENSSL_NO_DSA
1488                         if (pkey->type == EVP_PKEY_DSA)
1489                         {
1490                         /* lets do DSS */
1491                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1492                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1493                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1494                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1495                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1496                                 {
1497                                 /* bad signature */
1498                                 al=SSL_AD_DECRYPT_ERROR;
1499                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1500                                 goto f_err;
1501                                 }
1502                         }
1503                 else
1504 #endif
1505 #ifndef OPENSSL_NO_ECDSA
1506                         if (pkey->type == EVP_PKEY_EC)
1507                         {
1508                         /* let's do ECDSA */
1509                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1510                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1511                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1512                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1513                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1514                                 {
1515                                 /* bad signature */
1516                                 al=SSL_AD_DECRYPT_ERROR;
1517                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1518                                 goto f_err;
1519                                 }
1520                         }
1521                 else
1522 #endif
1523                         {
1524                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1525                         goto err;
1526                         }
1527                 }
1528         else
1529                 {
1530                 /* still data left over */
1531                 if (!(alg & SSL_aNULL))
1532                         {
1533                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1534                         goto err;
1535                         }
1536                 if (n != 0)
1537                         {
1538                         al=SSL_AD_DECODE_ERROR;
1539                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1540                         goto f_err;
1541                         }
1542                 }
1543         EVP_PKEY_free(pkey);
1544         EVP_MD_CTX_cleanup(&md_ctx);
1545         return(1);
1546 f_err:
1547         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1548 err:
1549         EVP_PKEY_free(pkey);
1550 #ifndef OPENSSL_NO_RSA
1551         if (rsa != NULL)
1552                 RSA_free(rsa);
1553 #endif
1554 #ifndef OPENSSL_NO_DH
1555         if (dh != NULL)
1556                 DH_free(dh);
1557 #endif
1558 #ifndef OPENSSL_NO_ECDH
1559         BN_CTX_free(bn_ctx);
1560         EC_POINT_free(srvr_ecpoint);
1561         if (ecdh != NULL)
1562                 EC_KEY_free(ecdh);
1563 #endif
1564         EVP_MD_CTX_cleanup(&md_ctx);
1565         return(-1);
1566         }
1567
1568 int ssl3_get_certificate_request(SSL *s)
1569         {
1570         int ok,ret=0;
1571         unsigned long n,nc,l;
1572         unsigned int llen,ctype_num,i;
1573         X509_NAME *xn=NULL;
1574         const unsigned char *p,*q;
1575         unsigned char *d;
1576         STACK_OF(X509_NAME) *ca_sk=NULL;
1577
1578         n=s->method->ssl_get_message(s,
1579                 SSL3_ST_CR_CERT_REQ_A,
1580                 SSL3_ST_CR_CERT_REQ_B,
1581                 -1,
1582                 s->max_cert_list,
1583                 &ok);
1584
1585         if (!ok) return((int)n);
1586
1587         s->s3->tmp.cert_req=0;
1588
1589         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1590                 {
1591                 s->s3->tmp.reuse_message=1;
1592                 return(1);
1593                 }
1594
1595         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1596                 {
1597                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1598                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1599                 goto err;
1600                 }
1601
1602         /* TLS does not like anon-DH with client cert */
1603         if (s->version > SSL3_VERSION)
1604                 {
1605                 l=s->s3->tmp.new_cipher->algorithms;
1606                 if (l & SSL_aNULL)
1607                         {
1608                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1609                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1610                         goto err;
1611                         }
1612                 }
1613
1614         p=d=(unsigned char *)s->init_msg;
1615
1616         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1617                 {
1618                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1619                 goto err;
1620                 }
1621
1622         /* get the certificate types */
1623         ctype_num= *(p++);
1624         if (ctype_num > SSL3_CT_NUMBER)
1625                 ctype_num=SSL3_CT_NUMBER;
1626         for (i=0; i<ctype_num; i++)
1627                 s->s3->tmp.ctype[i]= p[i];
1628         p+=ctype_num;
1629
1630         /* get the CA RDNs */
1631         n2s(p,llen);
1632 #if 0
1633 {
1634 FILE *out;
1635 out=fopen("/tmp/vsign.der","w");
1636 fwrite(p,1,llen,out);
1637 fclose(out);
1638 }
1639 #endif
1640
1641         if ((llen+ctype_num+2+1) != n)
1642                 {
1643                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1644                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1645                 goto err;
1646                 }
1647
1648         for (nc=0; nc<llen; )
1649                 {
1650                 n2s(p,l);
1651                 if ((l+nc+2) > llen)
1652                         {
1653                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1654                                 goto cont; /* netscape bugs */
1655                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1656                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1657                         goto err;
1658                         }
1659
1660                 q=p;
1661
1662                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1663                         {
1664                         /* If netscape tolerance is on, ignore errors */
1665                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1666                                 goto cont;
1667                         else
1668                                 {
1669                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1670                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1671                                 goto err;
1672                                 }
1673                         }
1674
1675                 if (q != (p+l))
1676                         {
1677                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1678                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1679                         goto err;
1680                         }
1681                 if (!sk_X509_NAME_push(ca_sk,xn))
1682                         {
1683                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1684                         goto err;
1685                         }
1686
1687                 p+=l;
1688                 nc+=l+2;
1689                 }
1690
1691         if (0)
1692                 {
1693 cont:
1694                 ERR_clear_error();
1695                 }
1696
1697         /* we should setup a certificate to return.... */
1698         s->s3->tmp.cert_req=1;
1699         s->s3->tmp.ctype_num=ctype_num;
1700         if (s->s3->tmp.ca_names != NULL)
1701                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1702         s->s3->tmp.ca_names=ca_sk;
1703         ca_sk=NULL;
1704
1705         ret=1;
1706 err:
1707         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1708         return(ret);
1709         }
1710
1711 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1712         {
1713         return(X509_NAME_cmp(*a,*b));
1714         }
1715 #ifndef OPENSSL_NO_TLSEXT
1716 int ssl3_get_new_session_ticket(SSL *s)
1717         {
1718         int ok,al,ret=0, ticklen;
1719         long n;
1720         const unsigned char *p;
1721         unsigned char *d;
1722
1723         n=s->method->ssl_get_message(s,
1724                 SSL3_ST_CR_SESSION_TICKET_A,
1725                 SSL3_ST_CR_SESSION_TICKET_B,
1726                 -1,
1727                 16384,
1728                 &ok);
1729
1730         if (!ok)
1731                 return((int)n);
1732
1733         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
1734                 {
1735                 s->s3->tmp.reuse_message=1;
1736                 return(1);
1737                 }
1738         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
1739                 {
1740                 al=SSL_AD_UNEXPECTED_MESSAGE;
1741                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
1742                 goto f_err;
1743                 }
1744         if (n < 6)
1745                 {
1746                 /* need at least ticket_lifetime_hint + ticket length */
1747                 al = SSL_AD_DECODE_ERROR;
1748                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1749                 goto f_err;
1750                 }
1751
1752         p=d=(unsigned char *)s->init_msg;
1753         n2l(p, s->session->tlsext_tick_lifetime_hint);
1754         n2s(p, ticklen);
1755         /* ticket_lifetime_hint + ticket_length + ticket */
1756         if (ticklen + 6 != n)
1757                 {
1758                 al = SSL_AD_DECODE_ERROR;
1759                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1760                 goto f_err;
1761                 }
1762         if (s->session->tlsext_tick)
1763                 {
1764                 OPENSSL_free(s->session->tlsext_tick);
1765                 s->session->tlsext_ticklen = 0;
1766                 }
1767         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1768         if (!s->session->tlsext_tick)
1769                 {
1770                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
1771                 goto err;
1772                 }
1773         memcpy(s->session->tlsext_tick, p, ticklen);
1774         s->session->tlsext_ticklen = ticklen;
1775         /* There are two ways to detect a resumed ticket sesion.
1776          * One is to set an appropriate session ID and then the server
1777          * must return a match in ServerHello. This allows the normal
1778          * client session ID matching to work and we know much
1779          * earlier that the ticket has been accepted.
1780          *
1781          * The other way is to set zero length session ID when the
1782          * ticket is presented and rely on the handshake to determine
1783          * session resumption.
1784          *
1785          * We choose the former approach because this fits in with
1786          * assumptions elsewhere in OpenSSL. The session ID is set
1787          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
1788          * ticket.
1789          */
1790         EVP_Digest(p, ticklen,
1791                         s->session->session_id, &s->session->session_id_length,
1792 #ifndef OPENSSL_NO_SHA256
1793                                                         EVP_sha256(), NULL);
1794 #else
1795                                                         EVP_sha1(), NULL);
1796 #endif
1797         ret=1;
1798         return(ret);
1799 f_err:
1800         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1801 err:
1802         return(-1);
1803         }
1804
1805 int ssl3_get_cert_status(SSL *s)
1806         {
1807         int ok, al;
1808         unsigned long resplen;
1809         long n;
1810         const unsigned char *p;
1811
1812         n=s->method->ssl_get_message(s,
1813                 SSL3_ST_CR_CERT_STATUS_A,
1814                 SSL3_ST_CR_CERT_STATUS_B,
1815                 SSL3_MT_CERTIFICATE_STATUS,
1816                 16384,
1817                 &ok);
1818
1819         if (!ok) return((int)n);
1820         if (n < 4)
1821                 {
1822                 /* need at least status type + length */
1823                 al = SSL_AD_DECODE_ERROR;
1824                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1825                 goto f_err;
1826                 }
1827         p = (unsigned char *)s->init_msg;
1828         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
1829                 {
1830                 al = SSL_AD_DECODE_ERROR;
1831                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
1832                 goto f_err;
1833                 }
1834         n2l3(p, resplen);
1835         if (resplen + 4 != (unsigned long)n)
1836                 {
1837                 al = SSL_AD_DECODE_ERROR;
1838                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1839                 goto f_err;
1840                 }
1841         if (s->tlsext_ocsp_resp)
1842                 OPENSSL_free(s->tlsext_ocsp_resp);
1843         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
1844         if (!s->tlsext_ocsp_resp)
1845                 {
1846                 al = SSL_AD_INTERNAL_ERROR;
1847                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1848                 goto f_err;
1849                 }
1850         s->tlsext_ocsp_resplen = resplen;
1851         if (s->ctx->tlsext_status_cb)
1852                 {
1853                 int ret;
1854                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1855                 if (ret == 0)
1856                         {
1857                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1858                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
1859                         goto f_err;
1860                         }
1861                 if (ret < 0)
1862                         {
1863                         al = SSL_AD_INTERNAL_ERROR;
1864                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1865                         goto f_err;
1866                         }
1867                 }
1868         return 1;
1869 f_err:
1870         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1871         return(-1);
1872         }
1873 #endif
1874
1875 int ssl3_get_server_done(SSL *s)
1876         {
1877         int ok,ret=0;
1878         long n;
1879
1880         n=s->method->ssl_get_message(s,
1881                 SSL3_ST_CR_SRVR_DONE_A,
1882                 SSL3_ST_CR_SRVR_DONE_B,
1883                 SSL3_MT_SERVER_DONE,
1884                 30, /* should be very small, like 0 :-) */
1885                 &ok);
1886
1887         if (!ok) return((int)n);
1888         if (n > 0)
1889                 {
1890                 /* should contain no data */
1891                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1892                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1893                 return -1;
1894                 }
1895         ret=1;
1896         return(ret);
1897         }
1898
1899
1900 int ssl3_send_client_key_exchange(SSL *s)
1901         {
1902         unsigned char *p,*d;
1903         int n;
1904         unsigned long l;
1905 #ifndef OPENSSL_NO_RSA
1906         unsigned char *q;
1907         EVP_PKEY *pkey=NULL;
1908 #endif
1909 #ifndef OPENSSL_NO_KRB5
1910         KSSL_ERR kssl_err;
1911 #endif /* OPENSSL_NO_KRB5 */
1912 #ifndef OPENSSL_NO_ECDH
1913         EC_KEY *clnt_ecdh = NULL;
1914         const EC_POINT *srvr_ecpoint = NULL;
1915         EVP_PKEY *srvr_pub_pkey = NULL;
1916         unsigned char *encodedPoint = NULL;
1917         int encoded_pt_len = 0;
1918         BN_CTX * bn_ctx = NULL;
1919 #endif
1920
1921         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1922                 {
1923                 d=(unsigned char *)s->init_buf->data;
1924                 p= &(d[4]);
1925
1926                 l=s->s3->tmp.new_cipher->algorithms;
1927
1928                 /* Fool emacs indentation */
1929                 if (0) {}
1930 #ifndef OPENSSL_NO_RSA
1931                 else if (l & SSL_kRSA)
1932                         {
1933                         RSA *rsa;
1934                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1935
1936                         if (s->session->sess_cert == NULL)
1937                                 {
1938                                 /* We should always have a server certificate with SSL_kRSA. */
1939                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1940                                 goto err;
1941                                 }
1942
1943                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1944                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1945                         else
1946                                 {
1947                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1948                                 if ((pkey == NULL) ||
1949                                         (pkey->type != EVP_PKEY_RSA) ||
1950                                         (pkey->pkey.rsa == NULL))
1951                                         {
1952                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1953                                         goto err;
1954                                         }
1955                                 rsa=pkey->pkey.rsa;
1956                                 EVP_PKEY_free(pkey);
1957                                 }
1958
1959                         tmp_buf[0]=s->client_version>>8;
1960                         tmp_buf[1]=s->client_version&0xff;
1961                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1962                                         goto err;
1963
1964                         s->session->master_key_length=sizeof tmp_buf;
1965
1966                         q=p;
1967                         /* Fix buf for TLS and beyond */
1968                         if (s->version > SSL3_VERSION)
1969                                 p+=2;
1970                         n=RSA_public_encrypt(sizeof tmp_buf,
1971                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1972 #ifdef PKCS1_CHECK
1973                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1974                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1975 #endif
1976                         if (n <= 0)
1977                                 {
1978                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1979                                 goto err;
1980                                 }
1981
1982                         /* Fix buf for TLS and beyond */
1983                         if (s->version > SSL3_VERSION)
1984                                 {
1985                                 s2n(n,q);
1986                                 n+=2;
1987                                 }
1988
1989                         s->session->master_key_length=
1990                                 s->method->ssl3_enc->generate_master_secret(s,
1991                                         s->session->master_key,
1992                                         tmp_buf,sizeof tmp_buf);
1993                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1994                         }
1995 #endif
1996 #ifndef OPENSSL_NO_KRB5
1997                 else if (l & SSL_kKRB5)
1998                         {
1999                         krb5_error_code krb5rc;
2000                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2001                         /*  krb5_data   krb5_ap_req;  */
2002                         krb5_data       *enc_ticket;
2003                         krb5_data       authenticator, *authp = NULL;
2004                         EVP_CIPHER_CTX  ciph_ctx;
2005                         EVP_CIPHER      *enc = NULL;
2006                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2007                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2008                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2009                                                 + EVP_MAX_IV_LENGTH];
2010                         int             padl, outl = sizeof(epms);
2011
2012                         EVP_CIPHER_CTX_init(&ciph_ctx);
2013
2014 #ifdef KSSL_DEBUG
2015                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2016                                 l, SSL_kKRB5);
2017 #endif  /* KSSL_DEBUG */
2018
2019                         authp = NULL;
2020 #ifdef KRB5SENDAUTH
2021                         if (KRB5SENDAUTH)  authp = &authenticator;
2022 #endif  /* KRB5SENDAUTH */
2023
2024                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2025                                 &kssl_err);
2026                         enc = kssl_map_enc(kssl_ctx->enctype);
2027                         if (enc == NULL)
2028                             goto err;
2029 #ifdef KSSL_DEBUG
2030                         {
2031                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2032                         if (krb5rc && kssl_err.text)
2033                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2034                         }
2035 #endif  /* KSSL_DEBUG */
2036
2037                         if (krb5rc)
2038                                 {
2039                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2040                                                 SSL_AD_HANDSHAKE_FAILURE);
2041                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2042                                                 kssl_err.reason);
2043                                 goto err;
2044                                 }
2045
2046                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2047                         **  in place of RFC 2712 KerberosWrapper, as in:
2048                         **
2049                         **  Send ticket (copy to *p, set n = length)
2050                         **  n = krb5_ap_req.length;
2051                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2052                         **  if (krb5_ap_req.data)
2053                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2054                         **
2055                         **  Now using real RFC 2712 KerberosWrapper
2056                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2057                         **  Note: 2712 "opaque" types are here replaced
2058                         **  with a 2-byte length followed by the value.
2059                         **  Example:
2060                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2061                         **  Where "xx xx" = length bytes.  Shown here with
2062                         **  optional authenticator omitted.
2063                         */
2064
2065                         /*  KerberosWrapper.Ticket              */
2066                         s2n(enc_ticket->length,p);
2067                         memcpy(p, enc_ticket->data, enc_ticket->length);
2068                         p+= enc_ticket->length;
2069                         n = enc_ticket->length + 2;
2070
2071                         /*  KerberosWrapper.Authenticator       */
2072                         if (authp  &&  authp->length)
2073                                 {
2074                                 s2n(authp->length,p);
2075                                 memcpy(p, authp->data, authp->length);
2076                                 p+= authp->length;
2077                                 n+= authp->length + 2;
2078
2079                                 free(authp->data);
2080                                 authp->data = NULL;
2081                                 authp->length = 0;
2082                                 }
2083                         else
2084                                 {
2085                                 s2n(0,p);/*  null authenticator length  */
2086                                 n+=2;
2087                                 }
2088
2089                             tmp_buf[0]=s->client_version>>8;
2090                             tmp_buf[1]=s->client_version&0xff;
2091                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2092                                 goto err;
2093
2094                         /*  20010420 VRS.  Tried it this way; failed.
2095                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2096                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2097                         **                              kssl_ctx->length);
2098                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2099                         */
2100
2101                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2102                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2103                                 kssl_ctx->key,iv);
2104                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2105                                 sizeof tmp_buf);
2106                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2107                         outl += padl;
2108                         if (outl > sizeof epms)
2109                                 {
2110                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2111                                 goto err;
2112                                 }
2113                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2114
2115                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2116                         s2n(outl,p);
2117                         memcpy(p, epms, outl);
2118                         p+=outl;
2119                         n+=outl + 2;
2120
2121                         s->session->master_key_length=
2122                                 s->method->ssl3_enc->generate_master_secret(s,
2123                                         s->session->master_key,
2124                                         tmp_buf, sizeof tmp_buf);
2125
2126                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2127                         OPENSSL_cleanse(epms, outl);
2128                         }
2129 #endif
2130 #ifndef OPENSSL_NO_DH
2131                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2132                         {
2133                         DH *dh_srvr,*dh_clnt;
2134
2135                         if (s->session->sess_cert == NULL)
2136                                 {
2137                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2138                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2139                                 goto err;
2140                                 }
2141
2142                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2143                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2144                         else
2145                                 {
2146                                 /* we get them from the cert */
2147                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2148                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2149                                 goto err;
2150                                 }
2151
2152                         /* generate a new random key */
2153                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2154                                 {
2155                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2156                                 goto err;
2157                                 }
2158                         if (!DH_generate_key(dh_clnt))
2159                                 {
2160                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2161                                 goto err;
2162                                 }
2163
2164                         /* use the 'p' output buffer for the DH key, but
2165                          * make sure to clear it out afterwards */
2166
2167                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2168
2169                         if (n <= 0)
2170                                 {
2171                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2172                                 goto err;
2173                                 }
2174
2175                         /* generate master key from the result */
2176                         s->session->master_key_length=
2177                                 s->method->ssl3_enc->generate_master_secret(s,
2178                                         s->session->master_key,p,n);
2179                         /* clean up */
2180                         memset(p,0,n);
2181
2182                         /* send off the data */
2183                         n=BN_num_bytes(dh_clnt->pub_key);
2184                         s2n(n,p);
2185                         BN_bn2bin(dh_clnt->pub_key,p);
2186                         n+=2;
2187
2188                         DH_free(dh_clnt);
2189
2190                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2191                         }
2192 #endif
2193
2194 #ifndef OPENSSL_NO_ECDH
2195                 else if ((l & SSL_kECDH) || (l & SSL_kECDHE))
2196                         {
2197                         const EC_GROUP *srvr_group = NULL;
2198                         EC_KEY *tkey;
2199                         int ecdh_clnt_cert = 0;
2200                         int field_size = 0;
2201
2202                         if (s->session->sess_cert == NULL)
2203                                 {
2204                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2205                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2206                                 goto err;
2207                                 }
2208
2209                         /* Did we send out the client's
2210                          * ECDH share for use in premaster
2211                          * computation as part of client certificate?
2212                          * If so, set ecdh_clnt_cert to 1.
2213                          */
2214                         if ((l & SSL_kECDH) && (s->cert != NULL))
2215                                 {
2216                                 /* XXX: For now, we do not support client
2217                                  * authentication using ECDH certificates.
2218                                  * To add such support, one needs to add
2219                                  * code that checks for appropriate
2220                                  * conditions and sets ecdh_clnt_cert to 1.
2221                                  * For example, the cert have an ECC
2222                                  * key on the same curve as the server's
2223                                  * and the key should be authorized for
2224                                  * key agreement.
2225                                  *
2226                                  * One also needs to add code in ssl3_connect
2227                                  * to skip sending the certificate verify
2228                                  * message.
2229                                  *
2230                                  * if ((s->cert->key->privatekey != NULL) &&
2231                                  *     (s->cert->key->privatekey->type ==
2232                                  *      EVP_PKEY_EC) && ...)
2233                                  * ecdh_clnt_cert = 1;
2234                                  */
2235                                 }
2236
2237                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2238                                 {
2239                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2240                                 }
2241                         else
2242                                 {
2243                                 /* Get the Server Public Key from Cert */
2244                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2245                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2246                                 if ((srvr_pub_pkey == NULL) ||
2247                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2248                                     (srvr_pub_pkey->pkey.ec == NULL))
2249                                         {
2250                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2251                                             ERR_R_INTERNAL_ERROR);
2252                                         goto err;
2253                                         }
2254
2255                                 tkey = srvr_pub_pkey->pkey.ec;
2256                                 }
2257
2258                         srvr_group   = EC_KEY_get0_group(tkey);
2259                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2260
2261                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2262                                 {
2263                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2264                                     ERR_R_INTERNAL_ERROR);
2265                                 goto err;
2266                                 }
2267
2268                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2269                                 {
2270                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2271                                 goto err;
2272                                 }
2273
2274                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2275                                 {
2276                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2277                                 goto err;
2278                                 }
2279                         if (ecdh_clnt_cert)
2280                                 {
2281                                 /* Reuse key info from our certificate
2282                                  * We only need our private key to perform
2283                                  * the ECDH computation.
2284                                  */
2285                                 const BIGNUM *priv_key;
2286                                 tkey = s->cert->key->privatekey->pkey.ec;
2287                                 priv_key = EC_KEY_get0_private_key(tkey);
2288                                 if (priv_key == NULL)
2289                                         {
2290                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2291                                         goto err;
2292                                         }
2293                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2294                                         {
2295                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2296                                         goto err;
2297                                         }
2298                                 }
2299                         else
2300                                 {
2301                                 /* Generate a new ECDH key pair */
2302                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2303                                         {
2304                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2305                                         goto err;
2306                                         }
2307                                 }
2308
2309                         /* use the 'p' output buffer for the ECDH key, but
2310                          * make sure to clear it out afterwards
2311                          */
2312
2313                         field_size = EC_GROUP_get_degree(srvr_group);
2314                         if (field_size <= 0)
2315                                 {
2316                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2317                                        ERR_R_ECDH_LIB);
2318                                 goto err;
2319                                 }
2320                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2321                         if (n <= 0)
2322                                 {
2323                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2324                                        ERR_R_ECDH_LIB);
2325                                 goto err;
2326                                 }
2327
2328                         /* generate master key from the result */
2329                         s->session->master_key_length = s->method->ssl3_enc \
2330                             -> generate_master_secret(s,
2331                                 s->session->master_key,
2332                                 p, n);
2333
2334                         memset(p, 0, n); /* clean up */
2335
2336                         if (ecdh_clnt_cert)
2337                                 {
2338                                 /* Send empty client key exch message */
2339                                 n = 0;
2340                                 }
2341                         else
2342                                 {
2343                                 /* First check the size of encoding and
2344                                  * allocate memory accordingly.
2345                                  */
2346                                 encoded_pt_len =
2347                                     EC_POINT_point2oct(srvr_group,
2348                                         EC_KEY_get0_public_key(clnt_ecdh),
2349                                         POINT_CONVERSION_UNCOMPRESSED,
2350                                         NULL, 0, NULL);
2351
2352                                 encodedPoint = (unsigned char *)
2353                                     OPENSSL_malloc(encoded_pt_len *
2354                                         sizeof(unsigned char));
2355                                 bn_ctx = BN_CTX_new();
2356                                 if ((encodedPoint == NULL) ||
2357                                     (bn_ctx == NULL))
2358                                         {
2359                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2360                                         goto err;
2361                                         }
2362
2363                                 /* Encode the public key */
2364                                 n = EC_POINT_point2oct(srvr_group,
2365                                     EC_KEY_get0_public_key(clnt_ecdh),
2366                                     POINT_CONVERSION_UNCOMPRESSED,
2367                                     encodedPoint, encoded_pt_len, bn_ctx);
2368
2369                                 *p = n; /* length of encoded point */
2370                                 /* Encoded point will be copied here */
2371                                 p += 1;
2372                                 /* copy the point */
2373                                 memcpy((unsigned char *)p, encodedPoint, n);
2374                                 /* increment n to account for length field */
2375                                 n += 1;
2376                                 }
2377
2378                         /* Free allocated memory */
2379                         BN_CTX_free(bn_ctx);
2380                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2381                         if (clnt_ecdh != NULL)
2382                                  EC_KEY_free(clnt_ecdh);
2383                         EVP_PKEY_free(srvr_pub_pkey);
2384                         }
2385 #endif /* !OPENSSL_NO_ECDH */
2386                 else
2387                         {
2388                         ssl3_send_alert(s, SSL3_AL_FATAL,
2389                             SSL_AD_HANDSHAKE_FAILURE);
2390                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2391                             ERR_R_INTERNAL_ERROR);
2392                         goto err;
2393                         }
2394
2395                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2396                 l2n3(n,d);
2397
2398                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2399                 /* number of bytes to write */
2400                 s->init_num=n+4;
2401                 s->init_off=0;
2402                 }
2403
2404         /* SSL3_ST_CW_KEY_EXCH_B */
2405         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2406 err:
2407 #ifndef OPENSSL_NO_ECDH
2408         BN_CTX_free(bn_ctx);
2409         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2410         if (clnt_ecdh != NULL)
2411                 EC_KEY_free(clnt_ecdh);
2412         EVP_PKEY_free(srvr_pub_pkey);
2413 #endif
2414         return(-1);
2415         }
2416
2417 int ssl3_send_client_verify(SSL *s)
2418         {
2419         unsigned char *p,*d;
2420         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2421         EVP_PKEY *pkey;
2422 #ifndef OPENSSL_NO_RSA
2423         unsigned u=0;
2424 #endif
2425         unsigned long n;
2426 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
2427         int j;
2428 #endif
2429
2430         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2431                 {
2432                 d=(unsigned char *)s->init_buf->data;
2433                 p= &(d[4]);
2434                 pkey=s->cert->key->privatekey;
2435
2436                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
2437                         &(data[MD5_DIGEST_LENGTH]));
2438
2439 #ifndef OPENSSL_NO_RSA
2440                 if (pkey->type == EVP_PKEY_RSA)
2441                         {
2442                         s->method->ssl3_enc->cert_verify_mac(s,
2443                                 &(s->s3->finish_dgst1),&(data[0]));
2444                         if (RSA_sign(NID_md5_sha1, data,
2445                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2446                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2447                                 {
2448                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2449                                 goto err;
2450                                 }
2451                         s2n(u,p);
2452                         n=u+2;
2453                         }
2454                 else
2455 #endif
2456 #ifndef OPENSSL_NO_DSA
2457                         if (pkey->type == EVP_PKEY_DSA)
2458                         {
2459                         if (!DSA_sign(pkey->save_type,
2460                                 &(data[MD5_DIGEST_LENGTH]),
2461                                 SHA_DIGEST_LENGTH,&(p[2]),
2462                                 (unsigned int *)&j,pkey->pkey.dsa))
2463                                 {
2464                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2465                                 goto err;
2466                                 }
2467                         s2n(j,p);
2468                         n=j+2;
2469                         }
2470                 else
2471 #endif
2472 #ifndef OPENSSL_NO_ECDSA
2473                         if (pkey->type == EVP_PKEY_EC)
2474                         {
2475                         if (!ECDSA_sign(pkey->save_type,
2476                                 &(data[MD5_DIGEST_LENGTH]),
2477                                 SHA_DIGEST_LENGTH,&(p[2]),
2478                                 (unsigned int *)&j,pkey->pkey.ec))
2479                                 {
2480                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2481                                     ERR_R_ECDSA_LIB);
2482                                 goto err;
2483                                 }
2484                         s2n(j,p);
2485                         n=j+2;
2486                         }
2487                 else
2488 #endif
2489                         {
2490                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2491                         goto err;
2492                         }
2493                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2494                 l2n3(n,d);
2495
2496                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2497                 s->init_num=(int)n+4;
2498                 s->init_off=0;
2499                 }
2500         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2501 err:
2502         return(-1);
2503         }
2504
2505 int ssl3_send_client_certificate(SSL *s)
2506         {
2507         X509 *x509=NULL;
2508         EVP_PKEY *pkey=NULL;
2509         int i;
2510         unsigned long l;
2511
2512         if (s->state == SSL3_ST_CW_CERT_A)
2513                 {
2514                 if ((s->cert == NULL) ||
2515                         (s->cert->key->x509 == NULL) ||
2516                         (s->cert->key->privatekey == NULL))
2517                         s->state=SSL3_ST_CW_CERT_B;
2518                 else
2519                         s->state=SSL3_ST_CW_CERT_C;
2520                 }
2521
2522         /* We need to get a client cert */
2523         if (s->state == SSL3_ST_CW_CERT_B)
2524                 {
2525                 /* If we get an error, we need to
2526                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2527                  * We then get retied later */
2528                 i=0;
2529                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
2530                 if (i < 0)
2531                         {
2532                         s->rwstate=SSL_X509_LOOKUP;
2533                         return(-1);
2534                         }
2535                 s->rwstate=SSL_NOTHING;
2536                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2537                         {
2538                         s->state=SSL3_ST_CW_CERT_B;
2539                         if (    !SSL_use_certificate(s,x509) ||
2540                                 !SSL_use_PrivateKey(s,pkey))
2541                                 i=0;
2542                         }
2543                 else if (i == 1)
2544                         {
2545                         i=0;
2546                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2547                         }
2548
2549                 if (x509 != NULL) X509_free(x509);
2550                 if (pkey != NULL) EVP_PKEY_free(pkey);
2551                 if (i == 0)
2552                         {
2553                         if (s->version == SSL3_VERSION)
2554                                 {
2555                                 s->s3->tmp.cert_req=0;
2556                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2557                                 return(1);
2558                                 }
2559                         else
2560                                 {
2561                                 s->s3->tmp.cert_req=2;
2562                                 }
2563                         }
2564
2565                 /* Ok, we have a cert */
2566                 s->state=SSL3_ST_CW_CERT_C;
2567                 }
2568
2569         if (s->state == SSL3_ST_CW_CERT_C)
2570                 {
2571                 s->state=SSL3_ST_CW_CERT_D;
2572                 l=ssl3_output_cert_chain(s,
2573                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2574                 s->init_num=(int)l;
2575                 s->init_off=0;
2576                 }
2577         /* SSL3_ST_CW_CERT_D */
2578         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2579         }
2580
2581 #define has_bits(i,m)   (((i)&(m)) == (m))
2582
2583 int ssl3_check_cert_and_algorithm(SSL *s)
2584         {
2585         int i,idx;
2586         long algs;
2587         EVP_PKEY *pkey=NULL;
2588         SESS_CERT *sc;
2589 #ifndef OPENSSL_NO_RSA
2590         RSA *rsa;
2591 #endif
2592 #ifndef OPENSSL_NO_DH
2593         DH *dh;
2594 #endif
2595
2596         sc=s->session->sess_cert;
2597
2598         algs=s->s3->tmp.new_cipher->algorithms;
2599
2600         /* we don't have a certificate */
2601         if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
2602                 return(1);
2603
2604         if (sc == NULL)
2605                 {
2606                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2607                 goto err;
2608                 }
2609
2610 #ifndef OPENSSL_NO_RSA
2611         rsa=s->session->sess_cert->peer_rsa_tmp;
2612 #endif
2613 #ifndef OPENSSL_NO_DH
2614         dh=s->session->sess_cert->peer_dh_tmp;
2615 #endif
2616
2617         /* This is the passed certificate */
2618
2619         idx=sc->peer_cert_type;
2620 #ifndef OPENSSL_NO_ECDH
2621         if (idx == SSL_PKEY_ECC)
2622                 {
2623                 if (check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2624                     s->s3->tmp.new_cipher) == 0)
2625                         { /* check failed */
2626                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2627                         goto f_err;
2628                         }
2629                 else
2630                         {
2631                         return 1;
2632                         }
2633                 }
2634 #endif
2635         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2636         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2637         EVP_PKEY_free(pkey);
2638
2639
2640         /* Check that we have a certificate if we require one */
2641         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2642                 {
2643                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2644                 goto f_err;
2645                 }
2646 #ifndef OPENSSL_NO_DSA
2647         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2648                 {
2649                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2650                 goto f_err;
2651                 }
2652 #endif
2653 #ifndef OPENSSL_NO_RSA
2654         if ((algs & SSL_kRSA) &&
2655                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2656                 {
2657                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2658                 goto f_err;
2659                 }
2660 #endif
2661 #ifndef OPENSSL_NO_DH
2662         if ((algs & SSL_kEDH) &&
2663                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2664                 {
2665                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2666                 goto f_err;
2667                 }
2668         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2669                 {
2670                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2671                 goto f_err;
2672                 }
2673 #ifndef OPENSSL_NO_DSA
2674         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2675                 {
2676                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2677                 goto f_err;
2678                 }
2679 #endif
2680 #endif
2681
2682         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2683                 {
2684 #ifndef OPENSSL_NO_RSA
2685                 if (algs & SSL_kRSA)
2686                         {
2687                         if (rsa == NULL
2688                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2689                                 {
2690                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2691                                 goto f_err;
2692                                 }
2693                         }
2694                 else
2695 #endif
2696 #ifndef OPENSSL_NO_DH
2697                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2698                             {
2699                             if (dh == NULL
2700                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2701                                 {
2702                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2703                                 goto f_err;
2704                                 }
2705                         }
2706                 else
2707 #endif
2708                         {
2709                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2710                         goto f_err;
2711                         }
2712                 }
2713         return(1);
2714 f_err:
2715         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2716 err:
2717         return(0);
2718         }
2719
2720
2721 #ifndef OPENSSL_NO_ECDH
2722 /* This is the complement of nid2curve_id in s3_srvr.c. */
2723 static int curve_id2nid(int curve_id)
2724 {
2725         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2726          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2727         static int nid_list[26] =
2728         {
2729                 0,
2730                 NID_sect163k1, /* sect163k1 (1) */
2731                 NID_sect163r1, /* sect163r1 (2) */
2732                 NID_sect163r2, /* sect163r2 (3) */
2733                 NID_sect193r1, /* sect193r1 (4) */
2734                 NID_sect193r2, /* sect193r2 (5) */
2735                 NID_sect233k1, /* sect233k1 (6) */
2736                 NID_sect233r1, /* sect233r1 (7) */
2737                 NID_sect239k1, /* sect239k1 (8) */
2738                 NID_sect283k1, /* sect283k1 (9) */
2739                 NID_sect283r1, /* sect283r1 (10) */
2740                 NID_sect409k1, /* sect409k1 (11) */
2741                 NID_sect409r1, /* sect409r1 (12) */
2742                 NID_sect571k1, /* sect571k1 (13) */
2743                 NID_sect571r1, /* sect571r1 (14) */
2744                 NID_secp160k1, /* secp160k1 (15) */
2745                 NID_secp160r1, /* secp160r1 (16) */
2746                 NID_secp160r2, /* secp160r2 (17) */
2747                 NID_secp192k1, /* secp192k1 (18) */
2748                 NID_X9_62_prime192v1, /* secp192r1 (19) */
2749                 NID_secp224k1, /* secp224k1 (20) */
2750                 NID_secp224r1, /* secp224r1 (21) */
2751                 NID_secp256k1, /* secp256k1 (22) */
2752                 NID_X9_62_prime256v1, /* secp256r1 (23) */
2753                 NID_secp384r1, /* secp384r1 (24) */
2754                 NID_secp521r1  /* secp521r1 (25) */
2755         };
2756
2757         if ((curve_id < 1) || (curve_id > 25)) return 0;
2758
2759         return nid_list[curve_id];
2760 }
2761 #endif
2762
2763 /* Check to see if handshake is full or resumed. Usually this is just a
2764  * case of checking to see if a cache hit has occurred. In the case of
2765  * session tickets we have to check the next message to be sure.
2766  */
2767
2768 #ifndef OPENSSL_NO_TLSEXT
2769 int ssl3_check_finished(SSL *s)
2770         {
2771         int ok;
2772         long n;
2773         /* If we have no ticket or session ID is non-zero length (a match of
2774          * a non-zero session length would never reach here) it cannot be a
2775          * resumed session.
2776          */
2777         if (!s->session->tlsext_tick || s->session->session_id_length)
2778                 return 1;
2779         /* this function is called when we really expect a Certificate
2780          * message, so permit appropriate message length */
2781         n=s->method->ssl_get_message(s,
2782                 SSL3_ST_CR_CERT_A,
2783                 SSL3_ST_CR_CERT_B,
2784                 -1,
2785                 s->max_cert_list,
2786                 &ok);
2787         if (!ok) return((int)n);
2788         s->s3->tmp.reuse_message = 1;
2789         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
2790                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
2791                 return 2;
2792
2793         return 1;
2794         }
2795 #endif
2796
2797 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
2798         {
2799         int i = 0;
2800 #ifndef OPENSSL_NO_ENGINE
2801         if (s->ctx->client_cert_engine)
2802                 {
2803                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
2804                                                 SSL_get_client_CA_list(s),
2805                                                 px509, ppkey, NULL, NULL, NULL);
2806                 if (i != 0)
2807                         return i;
2808                 }
2809 #endif
2810         if (s->ctx->client_cert_cb)
2811                 i = s->ctx->client_cert_cb(s,px509,ppkey);
2812         return i;
2813         }