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