crypto/openssl/ssl/s3_clnt.c

   1 /* ssl/s3_clnt.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2003 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124
 125 #include <stdio.h>
 126 #include "ssl_locl.h"
 127 #include "kssl_lcl.h"
 128 #include <openssl/buffer.h>
 129 #include <openssl/rand.h>
 130 #include <openssl/objects.h>
 131 #include <openssl/evp.h>
 132 #include <openssl/md5.h>
 133 #ifdef OPENSSL_FIPS
 134 #include <openssl/fips.h>
 135 #endif
 136
 137 #ifndef OPENSSL_NO_DH
 138 #include <openssl/dh.h>
 139 #endif
 140 #include <openssl/bn.h>
 141 #ifndef OPENSSL_NO_ENGINE
 142 #include <openssl/engine.h>
 143 #endif
 144
 145 static SSL_METHOD *ssl3_get_client_method(int ver);
 146 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 147
 148 #ifndef OPENSSL_NO_ECDH
 149 static int curve_id2nid(int curve_id);
 150 int check_srvr_ecc_cert_and_alg(X509 *x, SSL_CIPHER *cs);
 151 #endif
 152
 153 static SSL_METHOD *ssl3_get_client_method(int ver)
 154         {
 155         if (ver == SSL3_VERSION)
 156                 return(SSLv3_client_method());
 157         else
 158                 return(NULL);
 159         }
 160
 161 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 162                         ssl_undefined_function,
 163                         ssl3_connect,
 164                         ssl3_get_client_method)
 165
 166 int ssl3_connect(SSL *s)
 167         {
 168         BUF_MEM *buf=NULL;
 169         unsigned long Time=(unsigned long)time(NULL);
 170         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 171         int ret= -1;
 172         int new_state,state,skip=0;
 173
 174         RAND_add(&Time,sizeof(Time),0);
 175         ERR_clear_error();
 176         clear_sys_error();
 177
 178         if (s->info_callback != NULL)
 179                 cb=s->info_callback;
 180         else if (s->ctx->info_callback != NULL)
 181                 cb=s->ctx->info_callback;
 182
 183         s->in_handshake++;
 184         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 185
 186         for (;;)
 187                 {
 188                 state=s->state;
 189
 190                 switch(s->state)
 191                         {
 192                 case SSL_ST_RENEGOTIATE:
 193                         s->new_session=1;
 194                         s->state=SSL_ST_CONNECT;
 195                         s->ctx->stats.sess_connect_renegotiate++;
 196                         /* break */
 197                 case SSL_ST_BEFORE:
 198                 case SSL_ST_CONNECT:
 199                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 200                 case SSL_ST_OK|SSL_ST_CONNECT:
 201
 202                         s->server=0;
 203                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 204
 205                         if ((s->version & 0xff00 ) != 0x0300)
 206                                 {
 207                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 208                                 ret = -1;
 209                                 goto end;
 210                                 }
 211
 212                         /* s->version=SSL3_VERSION; */
 213                         s->type=SSL_ST_CONNECT;
 214
 215                         if (s->init_buf == NULL)
 216                                 {
 217                                 if ((buf=BUF_MEM_new()) == NULL)
 218                                         {
 219                                         ret= -1;
 220                                         goto end;
 221                                         }
 222                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 223                                         {
 224                                         ret= -1;
 225                                         goto end;
 226                                         }
 227                                 s->init_buf=buf;
 228                                 buf=NULL;
 229                                 }
 230
 231                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 232
 233                         /* setup buffing BIO */
 234                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 235
 236                         /* don't push the buffering BIO quite yet */
 237
 238                         ssl3_init_finished_mac(s);
 239
 240                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 241                         s->ctx->stats.sess_connect++;
 242                         s->init_num=0;
 243                         break;
 244
 245                 case SSL3_ST_CW_CLNT_HELLO_A:
 246                 case SSL3_ST_CW_CLNT_HELLO_B:
 247
 248                         s->shutdown=0;
 249                         ret=ssl3_client_hello(s);
 250                         if (ret <= 0) goto end;
 251                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 252                         s->init_num=0;
 253
 254                         /* turn on buffering for the next lot of output */
 255                         if (s->bbio != s->wbio)
 256                                 s->wbio=BIO_push(s->bbio,s->wbio);
 257
 258                         break;
 259
 260                 case SSL3_ST_CR_SRVR_HELLO_A:
 261                 case SSL3_ST_CR_SRVR_HELLO_B:
 262                         ret=ssl3_get_server_hello(s);
 263                         if (ret <= 0) goto end;
 264                         if (s->hit)
 265                                 {
 266                                 s->state=SSL3_ST_CR_FINISHED_A;
 267 #ifndef OPENSSL_NO_TLSEXT
 268                                 if (s->tlsext_ticket_expected)
 269                                         {
 270                                         /* receive renewed session ticket */
 271                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 272                                         }
 273 #endif
 274                                 }
 275                         else
 276                                 s->state=SSL3_ST_CR_CERT_A;
 277                         s->init_num=0;
 278                         break;
 279
 280                 case SSL3_ST_CR_CERT_A:
 281                 case SSL3_ST_CR_CERT_B:
 282 #ifndef OPENSSL_NO_TLSEXT
 283                         ret=ssl3_check_finished(s);
 284                         if (ret <= 0) goto end;
 285                         if (ret == 2)
 286                                 {
 287                                 s->hit = 1;
 288                                 if (s->tlsext_ticket_expected)
 289                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 290                                 else
 291                                         s->state=SSL3_ST_CR_FINISHED_A;
 292                                 s->init_num=0;
 293                                 break;
 294                                 }
 295 #endif
 296                         /* Check if it is anon DH/ECDH */
 297                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 298                                 {
 299                                 ret=ssl3_get_server_certificate(s);
 300                                 if (ret <= 0) goto end;
 301 #ifndef OPENSSL_NO_TLSEXT
 302                                 if (s->tlsext_status_expected)
 303                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 304                                 else
 305                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 306                                 }
 307                         else
 308                                 {
 309                                 skip = 1;
 310                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 311                                 }
 312 #else
 313                                 }
 314                         else
 315                                 skip=1;
 316
 317                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 318 #endif
 319                         s->init_num=0;
 320                         break;
 321
 322                 case SSL3_ST_CR_KEY_EXCH_A:
 323                 case SSL3_ST_CR_KEY_EXCH_B:
 324                         ret=ssl3_get_key_exchange(s);
 325                         if (ret <= 0) goto end;
 326                         s->state=SSL3_ST_CR_CERT_REQ_A;
 327                         s->init_num=0;
 328
 329                         /* at this point we check that we have the
 330                          * required stuff from the server */
 331                         if (!ssl3_check_cert_and_algorithm(s))
 332                                 {
 333                                 ret= -1;
 334                                 goto end;
 335                                 }
 336                         break;
 337
 338                 case SSL3_ST_CR_CERT_REQ_A:
 339                 case SSL3_ST_CR_CERT_REQ_B:
 340                         ret=ssl3_get_certificate_request(s);
 341                         if (ret <= 0) goto end;
 342                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 343                         s->init_num=0;
 344                         break;
 345
 346                 case SSL3_ST_CR_SRVR_DONE_A:
 347                 case SSL3_ST_CR_SRVR_DONE_B:
 348                         ret=ssl3_get_server_done(s);
 349                         if (ret <= 0) goto end;
 350                         if (s->s3->tmp.cert_req)
 351                                 s->state=SSL3_ST_CW_CERT_A;
 352                         else
 353                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 354                         s->init_num=0;
 355
 356                         break;
 357
 358                 case SSL3_ST_CW_CERT_A:
 359                 case SSL3_ST_CW_CERT_B:
 360                 case SSL3_ST_CW_CERT_C:
 361                 case SSL3_ST_CW_CERT_D:
 362                         ret=ssl3_send_client_certificate(s);
 363                         if (ret <= 0) goto end;
 364                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 365                         s->init_num=0;
 366                         break;
 367
 368                 case SSL3_ST_CW_KEY_EXCH_A:
 369                 case SSL3_ST_CW_KEY_EXCH_B:
 370                         ret=ssl3_send_client_key_exchange(s);
 371                         if (ret <= 0) goto end;
 372                         /* EAY EAY EAY need to check for DH fix cert
 373                          * sent back */
 374                         /* For TLS, cert_req is set to 2, so a cert chain
 375                          * of nothing is sent, but no verify packet is sent */
 376                         /* XXX: For now, we do not support client
 377                          * authentication in ECDH cipher suites with
 378                          * ECDH (rather than ECDSA) certificates.
 379                          * We need to skip the certificate verify
 380                          * message when client's ECDH public key is sent
 381                          * inside the client certificate.
 382                          */
 383                         if (s->s3->tmp.cert_req == 1)
 384                                 {
 385                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 386                                 }
 387                         else
 388                                 {
 389                                 s->state=SSL3_ST_CW_CHANGE_A;
 390                                 s->s3->change_cipher_spec=0;
 391                                 }
 392
 393                         s->init_num=0;
 394                         break;
 395
 396                 case SSL3_ST_CW_CERT_VRFY_A:
 397                 case SSL3_ST_CW_CERT_VRFY_B:
 398                         ret=ssl3_send_client_verify(s);
 399                         if (ret <= 0) goto end;
 400                         s->state=SSL3_ST_CW_CHANGE_A;
 401                         s->init_num=0;
 402                         s->s3->change_cipher_spec=0;
 403                         break;
 404
 405                 case SSL3_ST_CW_CHANGE_A:
 406                 case SSL3_ST_CW_CHANGE_B:
 407                         ret=ssl3_send_change_cipher_spec(s,
 408                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 409                         if (ret <= 0) goto end;
 410                         s->state=SSL3_ST_CW_FINISHED_A;
 411                         s->init_num=0;
 412
 413                         s->session->cipher=s->s3->tmp.new_cipher;
 414 #ifdef OPENSSL_NO_COMP
 415                         s->session->compress_meth=0;
 416 #else
 417                         if (s->s3->tmp.new_compression == NULL)
 418                                 s->session->compress_meth=0;
 419                         else
 420                                 s->session->compress_meth=
 421                                         s->s3->tmp.new_compression->id;
 422 #endif
 423                         if (!s->method->ssl3_enc->setup_key_block(s))
 424                                 {
 425                                 ret= -1;
 426                                 goto end;
 427                                 }
 428
 429                         if (!s->method->ssl3_enc->change_cipher_state(s,
 430                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 431                                 {
 432                                 ret= -1;
 433                                 goto end;
 434                                 }
 435
 436                         break;
 437
 438                 case SSL3_ST_CW_FINISHED_A:
 439                 case SSL3_ST_CW_FINISHED_B:
 440                         ret=ssl3_send_finished(s,
 441                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 442                                 s->method->ssl3_enc->client_finished_label,
 443                                 s->method->ssl3_enc->client_finished_label_len);
 444                         if (ret <= 0) goto end;
 445                         s->state=SSL3_ST_CW_FLUSH;
 446
 447                         /* clear flags */
 448                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 449                         if (s->hit)
 450                                 {
 451                                 s->s3->tmp.next_state=SSL_ST_OK;
 452                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 453                                         {
 454                                         s->state=SSL_ST_OK;
 455                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 456                                         s->s3->delay_buf_pop_ret=0;
 457                                         }
 458                                 }
 459                         else
 460                                 {
 461 #ifndef OPENSSL_NO_TLSEXT
 462                                 /* Allow NewSessionTicket if ticket expected */
 463                                 if (s->tlsext_ticket_expected)
 464                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 465                                 else
 466 #endif
 467
 468                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 469                                 }
 470                         s->init_num=0;
 471                         break;
 472
 473 #ifndef OPENSSL_NO_TLSEXT
 474                 case SSL3_ST_CR_SESSION_TICKET_A:
 475                 case SSL3_ST_CR_SESSION_TICKET_B:
 476                         ret=ssl3_get_new_session_ticket(s);
 477                         if (ret <= 0) goto end;
 478                         s->state=SSL3_ST_CR_FINISHED_A;
 479                         s->init_num=0;
 480                 break;
 481
 482                 case SSL3_ST_CR_CERT_STATUS_A:
 483                 case SSL3_ST_CR_CERT_STATUS_B:
 484                         ret=ssl3_get_cert_status(s);
 485                         if (ret <= 0) goto end;
 486                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 487                         s->init_num=0;
 488                 break;
 489 #endif
 490
 491                 case SSL3_ST_CR_FINISHED_A:
 492                 case SSL3_ST_CR_FINISHED_B:
 493
 494                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 495                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 496                                 SSL3_ST_CR_FINISHED_B);
 497                         if (ret <= 0) goto end;
 498
 499                         if (s->hit)
 500                                 s->state=SSL3_ST_CW_CHANGE_A;
 501                         else
 502                                 s->state=SSL_ST_OK;
 503                         s->init_num=0;
 504                         break;
 505
 506                 case SSL3_ST_CW_FLUSH:
 507                         s->rwstate=SSL_WRITING;
 508                         if (BIO_flush(s->wbio) <= 0)
 509                                 {
 510                                 ret= -1;
 511                                 goto end;
 512                                 }
 513                         s->rwstate=SSL_NOTHING;
 514                         s->state=s->s3->tmp.next_state;
 515                         break;
 516
 517                 case SSL_ST_OK:
 518                         /* clean a few things up */
 519                         ssl3_cleanup_key_block(s);
 520
 521                         if (s->init_buf != NULL)
 522                                 {
 523                                 BUF_MEM_free(s->init_buf);
 524                                 s->init_buf=NULL;
 525                                 }
 526
 527                         /* If we are not 'joining' the last two packets,
 528                          * remove the buffering now */
 529                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 530                                 ssl_free_wbio_buffer(s);
 531                         /* else do it later in ssl3_write */
 532
 533                         s->init_num=0;
 534                         s->new_session=0;
 535
 536                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 537                         if (s->hit) s->ctx->stats.sess_hit++;
 538
 539                         ret=1;
 540                         /* s->server=0; */
 541                         s->handshake_func=ssl3_connect;
 542                         s->ctx->stats.sess_connect_good++;
 543
 544                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 545
 546                         goto end;
 547                         /* break; */
 548
 549                 default:
 550                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 551                         ret= -1;
 552                         goto end;
 553                         /* break; */
 554                         }
 555
 556                 /* did we do anything */
 557                 if (!s->s3->tmp.reuse_message && !skip)
 558                         {
 559                         if (s->debug)
 560                                 {
 561                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 562                                         goto end;
 563                                 }
 564
 565                         if ((cb != NULL) && (s->state != state))
 566                                 {
 567                                 new_state=s->state;
 568                                 s->state=state;
 569                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 570                                 s->state=new_state;
 571                                 }
 572                         }
 573                 skip=0;
 574                 }
 575 end:
 576         s->in_handshake--;
 577         if (buf != NULL)
 578                 BUF_MEM_free(buf);
 579         if (cb != NULL)
 580                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 581         return(ret);
 582         }
 583
 584
 585 int ssl3_client_hello(SSL *s)
 586         {
 587         unsigned char *buf;
 588         unsigned char *p,*d;
 589         int i;
 590         unsigned long Time,l;
 591 #ifndef OPENSSL_NO_COMP
 592         int j;
 593         SSL_COMP *comp;
 594 #endif
 595
 596         buf=(unsigned char *)s->init_buf->data;
 597         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 598                 {
 599                 SSL_SESSION *sess = s->session;
 600                 if ((sess == NULL) ||
 601                         (sess->ssl_version != s->version) ||
 602 #ifdef OPENSSL_NO_TLSEXT
 603                         !sess->session_id_length ||
 604 #else
 605                         (!sess->session_id_length && !sess->tlsext_tick) ||
 606 #endif
 607                         (sess->not_resumable))
 608                         {
 609                         if (!ssl_get_new_session(s,0))
 610                                 goto err;
 611                         }
 612                 /* else use the pre-loaded session */
 613
 614                 p=s->s3->client_random;
 615                 Time=(unsigned long)time(NULL);                 /* Time */
 616                 l2n(Time,p);
 617                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 618                         goto err;
 619
 620                 /* Do the message type and length last */
 621                 d=p= &(buf[4]);
 622
 623                 *(p++)=s->version>>8;
 624                 *(p++)=s->version&0xff;
 625                 s->client_version=s->version;
 626
 627                 /* Random stuff */
 628                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 629                 p+=SSL3_RANDOM_SIZE;
 630
 631                 /* Session ID */
 632                 if (s->new_session)
 633                         i=0;
 634                 else
 635                         i=s->session->session_id_length;
 636                 *(p++)=i;
 637                 if (i != 0)
 638                         {
 639                         if (i > (int)sizeof(s->session->session_id))
 640                                 {
 641                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 642                                 goto err;
 643                                 }
 644                         memcpy(p,s->session->session_id,i);
 645                         p+=i;
 646                         }
 647
 648                 /* Ciphers supported */
 649                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 650                 if (i == 0)
 651                         {
 652                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 653                         goto err;
 654                         }
 655                 s2n(i,p);
 656                 p+=i;
 657
 658                 /* COMPRESSION */
 659 #ifdef OPENSSL_NO_COMP
 660                 *(p++)=1;
 661 #else
 662                 if (s->ctx->comp_methods == NULL)
 663                         j=0;
 664                 else
 665                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 666                 *(p++)=1+j;
 667                 for (i=0; i<j; i++)
 668                         {
 669                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 670                         *(p++)=comp->id;
 671                         }
 672 #endif
 673                 *(p++)=0; /* Add the NULL method */
 674 #ifndef OPENSSL_NO_TLSEXT
 675                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 676                         {
 677                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 678                         goto err;
 679                         }
 680 #endif
 681                 l=(p-d);
 682                 d=buf;
 683                 *(d++)=SSL3_MT_CLIENT_HELLO;
 684                 l2n3(l,d);
 685
 686                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 687                 /* number of bytes to write */
 688                 s->init_num=p-buf;
 689                 s->init_off=0;
 690                 }
 691
 692         /* SSL3_ST_CW_CLNT_HELLO_B */
 693         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 694 err:
 695         return(-1);
 696         }
 697
 698 int ssl3_get_server_hello(SSL *s)
 699         {
 700         STACK_OF(SSL_CIPHER) *sk;
 701         SSL_CIPHER *c;
 702         unsigned char *p,*d;
 703         int i,al,ok;
 704         unsigned int j;
 705         long n;
 706 #ifndef OPENSSL_NO_COMP
 707         SSL_COMP *comp;
 708 #endif
 709
 710         n=s->method->ssl_get_message(s,
 711                 SSL3_ST_CR_SRVR_HELLO_A,
 712                 SSL3_ST_CR_SRVR_HELLO_B,
 713                 -1,
 714                 20000, /* ?? */
 715                 &ok);
 716
 717         if (!ok) return((int)n);
 718
 719         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 720                 {
 721                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 722                         {
 723                         if ( s->d1->send_cookie == 0)
 724                                 {
 725                                 s->s3->tmp.reuse_message = 1;
 726                                 return 1;
 727                                 }
 728                         else /* already sent a cookie */
 729                                 {
 730                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 731                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 732                                 goto f_err;
 733                                 }
 734                         }
 735                 }
 736
 737         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 738                 {
 739                 al=SSL_AD_UNEXPECTED_MESSAGE;
 740                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 741                 goto f_err;
 742                 }
 743
 744         d=p=(unsigned char *)s->init_msg;
 745
 746         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 747                 {
 748                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 749                 s->version=(s->version&0xff00)|p[1];
 750                 al=SSL_AD_PROTOCOL_VERSION;
 751                 goto f_err;
 752                 }
 753         p+=2;
 754
 755         /* load the server hello data */
 756         /* load the server random */
 757         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 758         p+=SSL3_RANDOM_SIZE;
 759
 760         /* get the session-id */
 761         j= *(p++);
 762
 763         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 764                 {
 765                 al=SSL_AD_ILLEGAL_PARAMETER;
 766                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 767                 goto f_err;
 768                 }
 769
 770         if (j != 0 && j == s->session->session_id_length
 771             && memcmp(p,s->session->session_id,j) == 0)
 772             {
 773             if(s->sid_ctx_length != s->session->sid_ctx_length
 774                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 775                 {
 776                 /* actually a client application bug */
 777                 al=SSL_AD_ILLEGAL_PARAMETER;
 778                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 779                 goto f_err;
 780                 }
 781             s->s3->flags |= SSL3_FLAGS_CCS_OK;
 782             s->hit=1;
 783             }
 784         else    /* a miss or crap from the other end */
 785                 {
 786                 /* If we were trying for session-id reuse, make a new
 787                  * SSL_SESSION so we don't stuff up other people */
 788                 s->hit=0;
 789                 if (s->session->session_id_length > 0)
 790                         {
 791                         if (!ssl_get_new_session(s,0))
 792                                 {
 793                                 al=SSL_AD_INTERNAL_ERROR;
 794                                 goto f_err;
 795                                 }
 796                         }
 797                 s->session->session_id_length=j;
 798                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 799                 }
 800         p+=j;
 801         c=ssl_get_cipher_by_char(s,p);
 802         if (c == NULL)
 803                 {
 804                 /* unknown cipher */
 805                 al=SSL_AD_ILLEGAL_PARAMETER;
 806                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 807                 goto f_err;
 808                 }
 809         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 810
 811         sk=ssl_get_ciphers_by_id(s);
 812         i=sk_SSL_CIPHER_find(sk,c);
 813         if (i < 0)
 814                 {
 815                 /* we did not say we would use this cipher */
 816                 al=SSL_AD_ILLEGAL_PARAMETER;
 817                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 818                 goto f_err;
 819                 }
 820
 821         /* Depending on the session caching (internal/external), the cipher
 822            and/or cipher_id values may not be set. Make sure that
 823            cipher_id is set and use it for comparison. */
 824         if (s->session->cipher)
 825                 s->session->cipher_id = s->session->cipher->id;
 826         if (s->hit && (s->session->cipher_id != c->id))
 827                 {
 828 /* Workaround is now obsolete */
 829 #if 0
 830                 if (!(s->options &
 831                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 832 #endif
 833                         {
 834                         al=SSL_AD_ILLEGAL_PARAMETER;
 835                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 836                         goto f_err;
 837                         }
 838                 }
 839         s->s3->tmp.new_cipher=c;
 840
 841         /* lets get the compression algorithm */
 842         /* COMPRESSION */
 843 #ifdef OPENSSL_NO_COMP
 844         if (*(p++) != 0)
 845                 {
 846                 al=SSL_AD_ILLEGAL_PARAMETER;
 847                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 848                 goto f_err;
 849                 }
 850 #else
 851         j= *(p++);
 852         if (j == 0)
 853                 comp=NULL;
 854         else
 855                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 856
 857         if ((j != 0) && (comp == NULL))
 858                 {
 859                 al=SSL_AD_ILLEGAL_PARAMETER;
 860                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 861                 goto f_err;
 862                 }
 863         else
 864                 {
 865                 s->s3->tmp.new_compression=comp;
 866                 }
 867 #endif
 868 #ifndef OPENSSL_NO_TLSEXT
 869         /* TLS extensions*/
 870         if (s->version >= SSL3_VERSION)
 871                 {
 872                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
 873                         {
 874                         /* 'al' set by ssl_parse_serverhello_tlsext */
 875                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
 876                         goto f_err;
 877                         }
 878                 if (ssl_check_serverhello_tlsext(s) <= 0)
 879                         {
 880                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
 881                                 goto err;
 882                         }
 883                 }
 884 #endif
 885
 886
 887         if (p != (d+n))
 888                 {
 889                 /* wrong packet length */
 890                 al=SSL_AD_DECODE_ERROR;
 891                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 892                 goto f_err;
 893                 }
 894
 895         return(1);
 896 f_err:
 897         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 898 #ifndef OPENSSL_NO_TLSEXT
 899 err:
 900 #endif
 901         return(-1);
 902         }
 903
 904 int ssl3_get_server_certificate(SSL *s)
 905         {
 906         int al,i,ok,ret= -1;
 907         unsigned long n,nc,llen,l;
 908         X509 *x=NULL;
 909         const unsigned char *q,*p;
 910         unsigned char *d;
 911         STACK_OF(X509) *sk=NULL;
 912         SESS_CERT *sc;
 913         EVP_PKEY *pkey=NULL;
 914         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 915
 916         n=s->method->ssl_get_message(s,
 917                 SSL3_ST_CR_CERT_A,
 918                 SSL3_ST_CR_CERT_B,
 919                 -1,
 920                 s->max_cert_list,
 921                 &ok);
 922
 923         if (!ok) return((int)n);
 924
 925         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
 926                 ((s->s3->tmp.new_cipher->algorithms & SSL_aKRB5) &&
 927                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
 928                 {
 929                 s->s3->tmp.reuse_message=1;
 930                 return(1);
 931                 }
 932
 933         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 934                 {
 935                 al=SSL_AD_UNEXPECTED_MESSAGE;
 936                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 937                 goto f_err;
 938                 }
 939         p=d=(unsigned char *)s->init_msg;
 940
 941         if ((sk=sk_X509_new_null()) == NULL)
 942                 {
 943                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 944                 goto err;
 945                 }
 946
 947         n2l3(p,llen);
 948         if (llen+3 != n)
 949                 {
 950                 al=SSL_AD_DECODE_ERROR;
 951                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 952                 goto f_err;
 953                 }
 954         for (nc=0; nc<llen; )
 955                 {
 956                 n2l3(p,l);
 957                 if ((l+nc+3) > llen)
 958                         {
 959                         al=SSL_AD_DECODE_ERROR;
 960                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 961                         goto f_err;
 962                         }
 963
 964                 q=p;
 965                 x=d2i_X509(NULL,&q,l);
 966                 if (x == NULL)
 967                         {
 968                         al=SSL_AD_BAD_CERTIFICATE;
 969                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 970                         goto f_err;
 971                         }
 972                 if (q != (p+l))
 973                         {
 974                         al=SSL_AD_DECODE_ERROR;
 975                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 976                         goto f_err;
 977                         }
 978                 if (!sk_X509_push(sk,x))
 979                         {
 980                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 981                         goto err;
 982                         }
 983                 x=NULL;
 984                 nc+=l+3;
 985                 p=q;
 986                 }
 987
 988         i=ssl_verify_cert_chain(s,sk);
 989         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
 990 #ifndef OPENSSL_NO_KRB5
 991                 && (s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 992                 != (SSL_aKRB5|SSL_kKRB5)
 993 #endif /* OPENSSL_NO_KRB5 */
 994                 )
 995                 {
 996                 al=ssl_verify_alarm_type(s->verify_result);
 997                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 998                 goto f_err;
 999                 }
1000         ERR_clear_error(); /* but we keep s->verify_result */
1001
1002         sc=ssl_sess_cert_new();
1003         if (sc == NULL) goto err;
1004
1005         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1006         s->session->sess_cert=sc;
1007
1008         sc->cert_chain=sk;
1009         /* Inconsistency alert: cert_chain does include the peer's
1010          * certificate, which we don't include in s3_srvr.c */
1011         x=sk_X509_value(sk,0);
1012         sk=NULL;
1013         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1014
1015         pkey=X509_get_pubkey(x);
1016
1017         /* VRS: allow null cert if auth == KRB5 */
1018         need_cert =     ((s->s3->tmp.new_cipher->algorithms
1019                          & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1020                          == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
1021
1022 #ifdef KSSL_DEBUG
1023         printf("pkey,x = %p, %p\n", (void *)pkey,(void *)x);
1024         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1025         printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
1026                 s->s3->tmp.new_cipher->algorithms, need_cert);
1027 #endif    /* KSSL_DEBUG */
1028
1029         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1030                 {
1031                 x=NULL;
1032                 al=SSL3_AL_FATAL;
1033                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1034                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1035                 goto f_err;
1036                 }
1037
1038         i=ssl_cert_type(x,pkey);
1039         if (need_cert && i < 0)
1040                 {
1041                 x=NULL;
1042                 al=SSL3_AL_FATAL;
1043                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1044                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1045                 goto f_err;
1046                 }
1047
1048         if (need_cert)
1049                 {
1050                 sc->peer_cert_type=i;
1051                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1052                 /* Why would the following ever happen?
1053                  * We just created sc a couple of lines ago. */
1054                 if (sc->peer_pkeys[i].x509 != NULL)
1055                         X509_free(sc->peer_pkeys[i].x509);
1056                 sc->peer_pkeys[i].x509=x;
1057                 sc->peer_key= &(sc->peer_pkeys[i]);
1058
1059                 if (s->session->peer != NULL)
1060                         X509_free(s->session->peer);
1061                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1062                 s->session->peer=x;
1063                 }
1064         else
1065                 {
1066                 sc->peer_cert_type=i;
1067                 sc->peer_key= NULL;
1068
1069                 if (s->session->peer != NULL)
1070                         X509_free(s->session->peer);
1071                 s->session->peer=NULL;
1072                 }
1073         s->session->verify_result = s->verify_result;
1074
1075         x=NULL;
1076         ret=1;
1077
1078         if (0)
1079                 {
1080 f_err:
1081                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1082                 }
1083 err:
1084         EVP_PKEY_free(pkey);
1085         X509_free(x);
1086         sk_X509_pop_free(sk,X509_free);
1087         return(ret);
1088         }
1089
1090 int ssl3_get_key_exchange(SSL *s)
1091         {
1092 #ifndef OPENSSL_NO_RSA
1093         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1094 #endif
1095         EVP_MD_CTX md_ctx;
1096         unsigned char *param,*p;
1097         int al,i,j,param_len,ok;
1098         long n,alg;
1099         EVP_PKEY *pkey=NULL;
1100 #ifndef OPENSSL_NO_RSA
1101         RSA *rsa=NULL;
1102 #endif
1103 #ifndef OPENSSL_NO_DH
1104         DH *dh=NULL;
1105 #endif
1106 #ifndef OPENSSL_NO_ECDH
1107         EC_KEY *ecdh = NULL;
1108         BN_CTX *bn_ctx = NULL;
1109         EC_POINT *srvr_ecpoint = NULL;
1110         int curve_nid = 0;
1111         int encoded_pt_len = 0;
1112 #endif
1113
1114         /* use same message size as in ssl3_get_certificate_request()
1115          * as ServerKeyExchange message may be skipped */
1116         n=s->method->ssl_get_message(s,
1117                 SSL3_ST_CR_KEY_EXCH_A,
1118                 SSL3_ST_CR_KEY_EXCH_B,
1119                 -1,
1120                 s->max_cert_list,
1121                 &ok);
1122
1123         if (!ok) return((int)n);
1124
1125         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1126                 {
1127                 s->s3->tmp.reuse_message=1;
1128                 return(1);
1129                 }
1130
1131         param=p=(unsigned char *)s->init_msg;
1132
1133         if (s->session->sess_cert != NULL)
1134                 {
1135 #ifndef OPENSSL_NO_RSA
1136                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1137                         {
1138                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1139                         s->session->sess_cert->peer_rsa_tmp=NULL;
1140                         }
1141 #endif
1142 #ifndef OPENSSL_NO_DH
1143                 if (s->session->sess_cert->peer_dh_tmp)
1144                         {
1145                         DH_free(s->session->sess_cert->peer_dh_tmp);
1146                         s->session->sess_cert->peer_dh_tmp=NULL;
1147                         }
1148 #endif
1149 #ifndef OPENSSL_NO_ECDH
1150                 if (s->session->sess_cert->peer_ecdh_tmp)
1151                         {
1152                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1153                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1154                         }
1155 #endif
1156                 }
1157         else
1158                 {
1159                 s->session->sess_cert=ssl_sess_cert_new();
1160                 }
1161
1162         param_len=0;
1163         alg=s->s3->tmp.new_cipher->algorithms;
1164         EVP_MD_CTX_init(&md_ctx);
1165
1166 #ifndef OPENSSL_NO_RSA
1167         if (alg & SSL_kRSA)
1168                 {
1169                 if ((rsa=RSA_new()) == NULL)
1170                         {
1171                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1172                         goto err;
1173                         }
1174                 n2s(p,i);
1175                 param_len=i+2;
1176                 if (param_len > n)
1177                         {
1178                         al=SSL_AD_DECODE_ERROR;
1179                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1180                         goto f_err;
1181                         }
1182                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1183                         {
1184                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1185                         goto err;
1186                         }
1187                 p+=i;
1188
1189                 n2s(p,i);
1190                 param_len+=i+2;
1191                 if (param_len > n)
1192                         {
1193                         al=SSL_AD_DECODE_ERROR;
1194                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1195                         goto f_err;
1196                         }
1197                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1198                         {
1199                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1200                         goto err;
1201                         }
1202                 p+=i;
1203                 n-=param_len;
1204
1205                 /* this should be because we are using an export cipher */
1206                 if (alg & SSL_aRSA)
1207                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1208                 else
1209                         {
1210                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1211                         goto err;
1212                         }
1213                 s->session->sess_cert->peer_rsa_tmp=rsa;
1214                 rsa=NULL;
1215                 }
1216 #else /* OPENSSL_NO_RSA */
1217         if (0)
1218                 ;
1219 #endif
1220 #ifndef OPENSSL_NO_DH
1221         else if (alg & SSL_kEDH)
1222                 {
1223                 if ((dh=DH_new()) == NULL)
1224                         {
1225                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1226                         goto err;
1227                         }
1228                 n2s(p,i);
1229                 param_len=i+2;
1230                 if (param_len > n)
1231                         {
1232                         al=SSL_AD_DECODE_ERROR;
1233                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1234                         goto f_err;
1235                         }
1236                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1237                         {
1238                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1239                         goto err;
1240                         }
1241                 p+=i;
1242
1243                 n2s(p,i);
1244                 param_len+=i+2;
1245                 if (param_len > n)
1246                         {
1247                         al=SSL_AD_DECODE_ERROR;
1248                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1249                         goto f_err;
1250                         }
1251                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1252                         {
1253                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1254                         goto err;
1255                         }
1256                 p+=i;
1257
1258                 n2s(p,i);
1259                 param_len+=i+2;
1260                 if (param_len > n)
1261                         {
1262                         al=SSL_AD_DECODE_ERROR;
1263                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1264                         goto f_err;
1265                         }
1266                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1267                         {
1268                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1269                         goto err;
1270                         }
1271                 p+=i;
1272                 n-=param_len;
1273
1274 #ifndef OPENSSL_NO_RSA
1275                 if (alg & SSL_aRSA)
1276                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1277 #else
1278                 if (0)
1279                         ;
1280 #endif
1281 #ifndef OPENSSL_NO_DSA
1282                 else if (alg & SSL_aDSS)
1283                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1284 #endif
1285                 /* else anonymous DH, so no certificate or pkey. */
1286
1287                 s->session->sess_cert->peer_dh_tmp=dh;
1288                 dh=NULL;
1289                 }
1290         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1291                 {
1292                 al=SSL_AD_ILLEGAL_PARAMETER;
1293                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1294                 goto f_err;
1295                 }
1296 #endif /* !OPENSSL_NO_DH */
1297
1298 #ifndef OPENSSL_NO_ECDH
1299         else if (alg & SSL_kECDHE)
1300                 {
1301                 EC_GROUP *ngroup;
1302                 const EC_GROUP *group;
1303
1304                 if ((ecdh=EC_KEY_new()) == NULL)
1305                         {
1306                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1307                         goto err;
1308                         }
1309
1310                 /* Extract elliptic curve parameters and the
1311                  * server's ephemeral ECDH public key.
1312                  * Keep accumulating lengths of various components in
1313                  * param_len and make sure it never exceeds n.
1314                  */
1315
1316                 /* XXX: For now we only support named (not generic) curves
1317                  * and the ECParameters in this case is just three bytes.
1318                  */
1319                 param_len=3;
1320                 if ((param_len > n) ||
1321                     (*p != NAMED_CURVE_TYPE) ||
1322                     ((curve_nid = curve_id2nid(*(p + 2))) == 0))
1323                         {
1324                         al=SSL_AD_INTERNAL_ERROR;
1325                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1326                         goto f_err;
1327                         }
1328
1329                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1330                 if (ngroup == NULL)
1331                         {
1332                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1333                         goto err;
1334                         }
1335                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1336                         {
1337                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1338                         goto err;
1339                         }
1340                 EC_GROUP_free(ngroup);
1341
1342                 group = EC_KEY_get0_group(ecdh);
1343
1344                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1345                     (EC_GROUP_get_degree(group) > 163))
1346                         {
1347                         al=SSL_AD_EXPORT_RESTRICTION;
1348                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1349                         goto f_err;
1350                         }
1351
1352                 p+=3;
1353
1354                 /* Next, get the encoded ECPoint */
1355                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1356                     ((bn_ctx = BN_CTX_new()) == NULL))
1357                         {
1358                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1359                         goto err;
1360                         }
1361
1362                 encoded_pt_len = *p;  /* length of encoded point */
1363                 p+=1;
1364                 param_len += (1 + encoded_pt_len);
1365                 if ((param_len > n) ||
1366                     (EC_POINT_oct2point(group, srvr_ecpoint,
1367                         p, encoded_pt_len, bn_ctx) == 0))
1368                         {
1369                         al=SSL_AD_DECODE_ERROR;
1370                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1371                         goto f_err;
1372                         }
1373
1374                 n-=param_len;
1375                 p+=encoded_pt_len;
1376
1377                 /* The ECC/TLS specification does not mention
1378                  * the use of DSA to sign ECParameters in the server
1379                  * key exchange message. We do support RSA and ECDSA.
1380                  */
1381                 if (0) ;
1382 #ifndef OPENSSL_NO_RSA
1383                 else if (alg & SSL_aRSA)
1384                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1385 #endif
1386 #ifndef OPENSSL_NO_ECDSA
1387                 else if (alg & SSL_aECDSA)
1388                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1389 #endif
1390                 /* else anonymous ECDH, so no certificate or pkey. */
1391                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1392                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1393                 ecdh=NULL;
1394                 BN_CTX_free(bn_ctx);
1395                 bn_ctx = NULL;
1396                 EC_POINT_free(srvr_ecpoint);
1397                 srvr_ecpoint = NULL;
1398                 }
1399         else if (alg & SSL_kECDH)
1400                 {
1401                 al=SSL_AD_UNEXPECTED_MESSAGE;
1402                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1403                 goto f_err;
1404                 }
1405 #endif /* !OPENSSL_NO_ECDH */
1406         if (alg & SSL_aFZA)
1407                 {
1408                 al=SSL_AD_HANDSHAKE_FAILURE;
1409                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1410                 goto f_err;
1411                 }
1412
1413
1414         /* p points to the next byte, there are 'n' bytes left */
1415
1416         /* if it was signed, check the signature */
1417         if (pkey != NULL)
1418                 {
1419                 n2s(p,i);
1420                 n-=2;
1421                 j=EVP_PKEY_size(pkey);
1422
1423                 if ((i != n) || (n > j) || (n <= 0))
1424                         {
1425                         /* wrong packet length */
1426                         al=SSL_AD_DECODE_ERROR;
1427                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1428                         goto f_err;
1429                         }
1430
1431 #ifndef OPENSSL_NO_RSA
1432                 if (pkey->type == EVP_PKEY_RSA)
1433                         {
1434                         int num;
1435
1436                         j=0;
1437                         q=md_buf;
1438                         for (num=2; num > 0; num--)
1439                                 {
1440                                 EVP_MD_CTX_set_flags(&md_ctx,
1441                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1442                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1443                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1444                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1445                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1446                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1447                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1448                                 q+=i;
1449                                 j+=i;
1450                                 }
1451                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1452                                                                 pkey->pkey.rsa);
1453                         if (i < 0)
1454                                 {
1455                                 al=SSL_AD_DECRYPT_ERROR;
1456                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1457                                 goto f_err;
1458                                 }
1459                         if (i == 0)
1460                                 {
1461                                 /* bad signature */
1462                                 al=SSL_AD_DECRYPT_ERROR;
1463                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1464                                 goto f_err;
1465                                 }
1466                         }
1467                 else
1468 #endif
1469 #ifndef OPENSSL_NO_DSA
1470                         if (pkey->type == EVP_PKEY_DSA)
1471                         {
1472                         /* lets do DSS */
1473                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1474                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1475                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1476                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1477                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1478                                 {
1479                                 /* bad signature */
1480                                 al=SSL_AD_DECRYPT_ERROR;
1481                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1482                                 goto f_err;
1483                                 }
1484                         }
1485                 else
1486 #endif
1487 #ifndef OPENSSL_NO_ECDSA
1488                         if (pkey->type == EVP_PKEY_EC)
1489                         {
1490                         /* let's do ECDSA */
1491                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1492                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1493                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1494                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1495                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1496                                 {
1497                                 /* bad signature */
1498                                 al=SSL_AD_DECRYPT_ERROR;
1499                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1500                                 goto f_err;
1501                                 }
1502                         }
1503                 else
1504 #endif
1505                         {
1506                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1507                         goto err;
1508                         }
1509                 }
1510         else
1511                 {
1512                 /* still data left over */
1513                 if (!(alg & SSL_aNULL))
1514                         {
1515                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1516                         goto err;
1517                         }
1518                 if (n != 0)
1519                         {
1520                         al=SSL_AD_DECODE_ERROR;
1521                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1522                         goto f_err;
1523                         }
1524                 }
1525         EVP_PKEY_free(pkey);
1526         EVP_MD_CTX_cleanup(&md_ctx);
1527         return(1);
1528 f_err:
1529         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1530 err:
1531         EVP_PKEY_free(pkey);
1532 #ifndef OPENSSL_NO_RSA
1533         if (rsa != NULL)
1534                 RSA_free(rsa);
1535 #endif
1536 #ifndef OPENSSL_NO_DH
1537         if (dh != NULL)
1538                 DH_free(dh);
1539 #endif
1540 #ifndef OPENSSL_NO_ECDH
1541         BN_CTX_free(bn_ctx);
1542         EC_POINT_free(srvr_ecpoint);
1543         if (ecdh != NULL)
1544                 EC_KEY_free(ecdh);
1545 #endif
1546         EVP_MD_CTX_cleanup(&md_ctx);
1547         return(-1);
1548         }
1549
1550 int ssl3_get_certificate_request(SSL *s)
1551         {
1552         int ok,ret=0;
1553         unsigned long n,nc,l;
1554         unsigned int llen,ctype_num,i;
1555         X509_NAME *xn=NULL;
1556         const unsigned char *p,*q;
1557         unsigned char *d;
1558         STACK_OF(X509_NAME) *ca_sk=NULL;
1559
1560         n=s->method->ssl_get_message(s,
1561                 SSL3_ST_CR_CERT_REQ_A,
1562                 SSL3_ST_CR_CERT_REQ_B,
1563                 -1,
1564                 s->max_cert_list,
1565                 &ok);
1566
1567         if (!ok) return((int)n);
1568
1569         s->s3->tmp.cert_req=0;
1570
1571         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1572                 {
1573                 s->s3->tmp.reuse_message=1;
1574                 return(1);
1575                 }
1576
1577         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1578                 {
1579                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1580                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1581                 goto err;
1582                 }
1583
1584         /* TLS does not like anon-DH with client cert */
1585         if (s->version > SSL3_VERSION)
1586                 {
1587                 l=s->s3->tmp.new_cipher->algorithms;
1588                 if (l & SSL_aNULL)
1589                         {
1590                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1591                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1592                         goto err;
1593                         }
1594                 }
1595
1596         p=d=(unsigned char *)s->init_msg;
1597
1598         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1599                 {
1600                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1601                 goto err;
1602                 }
1603
1604         /* get the certificate types */
1605         ctype_num= *(p++);
1606         if (ctype_num > SSL3_CT_NUMBER)
1607                 ctype_num=SSL3_CT_NUMBER;
1608         for (i=0; i<ctype_num; i++)
1609                 s->s3->tmp.ctype[i]= p[i];
1610         p+=ctype_num;
1611
1612         /* get the CA RDNs */
1613         n2s(p,llen);
1614 #if 0
1615 {
1616 FILE *out;
1617 out=fopen("/tmp/vsign.der","w");
1618 fwrite(p,1,llen,out);
1619 fclose(out);
1620 }
1621 #endif
1622
1623         if ((llen+ctype_num+2+1) != n)
1624                 {
1625                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1626                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1627                 goto err;
1628                 }
1629
1630         for (nc=0; nc<llen; )
1631                 {
1632                 n2s(p,l);
1633                 if ((l+nc+2) > llen)
1634                         {
1635                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1636                                 goto cont; /* netscape bugs */
1637                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1638                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1639                         goto err;
1640                         }
1641
1642                 q=p;
1643
1644                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1645                         {
1646                         /* If netscape tolerance is on, ignore errors */
1647                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1648                                 goto cont;
1649                         else
1650                                 {
1651                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1652                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1653                                 goto err;
1654                                 }
1655                         }
1656
1657                 if (q != (p+l))
1658                         {
1659                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1660                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1661                         goto err;
1662                         }
1663                 if (!sk_X509_NAME_push(ca_sk,xn))
1664                         {
1665                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1666                         goto err;
1667                         }
1668
1669                 p+=l;
1670                 nc+=l+2;
1671                 }
1672
1673         if (0)
1674                 {
1675 cont:
1676                 ERR_clear_error();
1677                 }
1678
1679         /* we should setup a certificate to return.... */
1680         s->s3->tmp.cert_req=1;
1681         s->s3->tmp.ctype_num=ctype_num;
1682         if (s->s3->tmp.ca_names != NULL)
1683                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1684         s->s3->tmp.ca_names=ca_sk;
1685         ca_sk=NULL;
1686
1687         ret=1;
1688 err:
1689         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1690         return(ret);
1691         }
1692
1693 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1694         {
1695         return(X509_NAME_cmp(*a,*b));
1696         }
1697 #ifndef OPENSSL_NO_TLSEXT
1698 int ssl3_get_new_session_ticket(SSL *s)
1699         {
1700         int ok,al,ret=0, ticklen;
1701         long n;
1702         const unsigned char *p;
1703         unsigned char *d;
1704
1705         n=s->method->ssl_get_message(s,
1706                 SSL3_ST_CR_SESSION_TICKET_A,
1707                 SSL3_ST_CR_SESSION_TICKET_B,
1708                 -1,
1709                 16384,
1710                 &ok);
1711
1712         if (!ok)
1713                 return((int)n);
1714
1715         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
1716                 {
1717                 s->s3->tmp.reuse_message=1;
1718                 return(1);
1719                 }
1720         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
1721                 {
1722                 al=SSL_AD_UNEXPECTED_MESSAGE;
1723                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
1724                 goto f_err;
1725                 }
1726         if (n < 6)
1727                 {
1728                 /* need at least ticket_lifetime_hint + ticket length */
1729                 al = SSL_AD_DECODE_ERROR;
1730                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1731                 goto f_err;
1732                 }
1733
1734         p=d=(unsigned char *)s->init_msg;
1735         n2l(p, s->session->tlsext_tick_lifetime_hint);
1736         n2s(p, ticklen);
1737         /* ticket_lifetime_hint + ticket_length + ticket */
1738         if (ticklen + 6 != n)
1739                 {
1740                 al = SSL_AD_DECODE_ERROR;
1741                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1742                 goto f_err;
1743                 }
1744         if (s->session->tlsext_tick)
1745                 {
1746                 OPENSSL_free(s->session->tlsext_tick);
1747                 s->session->tlsext_ticklen = 0;
1748                 }
1749         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1750         if (!s->session->tlsext_tick)
1751                 {
1752                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
1753                 goto err;
1754                 }
1755         memcpy(s->session->tlsext_tick, p, ticklen);
1756         s->session->tlsext_ticklen = ticklen;
1757         /* There are two ways to detect a resumed ticket sesion.
1758          * One is to set an appropriate session ID and then the server
1759          * must return a match in ServerHello. This allows the normal
1760          * client session ID matching to work and we know much
1761          * earlier that the ticket has been accepted.
1762          *
1763          * The other way is to set zero length session ID when the
1764          * ticket is presented and rely on the handshake to determine
1765          * session resumption.
1766          *
1767          * We choose the former approach because this fits in with
1768          * assumptions elsewhere in OpenSSL. The session ID is set
1769          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
1770          * ticket.
1771          */
1772         EVP_Digest(p, ticklen,
1773                         s->session->session_id, &s->session->session_id_length,
1774 #ifndef OPENSSL_NO_SHA256
1775                                                         EVP_sha256(), NULL);
1776 #else
1777                                                         EVP_sha1(), NULL);
1778 #endif
1779         ret=1;
1780         return(ret);
1781 f_err:
1782         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1783 err:
1784         return(-1);
1785         }
1786
1787 int ssl3_get_cert_status(SSL *s)
1788         {
1789         int ok, al;
1790         unsigned long resplen;
1791         long n;
1792         const unsigned char *p;
1793
1794         n=s->method->ssl_get_message(s,
1795                 SSL3_ST_CR_CERT_STATUS_A,
1796                 SSL3_ST_CR_CERT_STATUS_B,
1797                 SSL3_MT_CERTIFICATE_STATUS,
1798                 16384,
1799                 &ok);
1800
1801         if (!ok) return((int)n);
1802         if (n < 4)
1803                 {
1804                 /* need at least status type + length */
1805                 al = SSL_AD_DECODE_ERROR;
1806                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1807                 goto f_err;
1808                 }
1809         p = (unsigned char *)s->init_msg;
1810         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
1811                 {
1812                 al = SSL_AD_DECODE_ERROR;
1813                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
1814                 goto f_err;
1815                 }
1816         n2l3(p, resplen);
1817         if (resplen + 4 != (unsigned long)n)
1818                 {
1819                 al = SSL_AD_DECODE_ERROR;
1820                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1821                 goto f_err;
1822                 }
1823         if (s->tlsext_ocsp_resp)
1824                 OPENSSL_free(s->tlsext_ocsp_resp);
1825         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
1826         if (!s->tlsext_ocsp_resp)
1827                 {
1828                 al = SSL_AD_INTERNAL_ERROR;
1829                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1830                 goto f_err;
1831                 }
1832         s->tlsext_ocsp_resplen = resplen;
1833         if (s->ctx->tlsext_status_cb)
1834                 {
1835                 int ret;
1836                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1837                 if (ret == 0)
1838                         {
1839                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1840                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
1841                         goto f_err;
1842                         }
1843                 if (ret < 0)
1844                         {
1845                         al = SSL_AD_INTERNAL_ERROR;
1846                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1847                         goto f_err;
1848                         }
1849                 }
1850         return 1;
1851 f_err:
1852         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1853         return(-1);
1854         }
1855 #endif
1856
1857 int ssl3_get_server_done(SSL *s)
1858         {
1859         int ok,ret=0;
1860         long n;
1861
1862         n=s->method->ssl_get_message(s,
1863                 SSL3_ST_CR_SRVR_DONE_A,
1864                 SSL3_ST_CR_SRVR_DONE_B,
1865                 SSL3_MT_SERVER_DONE,
1866                 30, /* should be very small, like 0 :-) */
1867                 &ok);
1868
1869         if (!ok) return((int)n);
1870         if (n > 0)
1871                 {
1872                 /* should contain no data */
1873                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1874                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1875                 return -1;
1876                 }
1877         ret=1;
1878         return(ret);
1879         }
1880
1881
1882 int ssl3_send_client_key_exchange(SSL *s)
1883         {
1884         unsigned char *p,*d;
1885         int n;
1886         unsigned long l;
1887 #ifndef OPENSSL_NO_RSA
1888         unsigned char *q;
1889         EVP_PKEY *pkey=NULL;
1890 #endif
1891 #ifndef OPENSSL_NO_KRB5
1892         KSSL_ERR kssl_err;
1893 #endif /* OPENSSL_NO_KRB5 */
1894 #ifndef OPENSSL_NO_ECDH
1895         EC_KEY *clnt_ecdh = NULL;
1896         const EC_POINT *srvr_ecpoint = NULL;
1897         EVP_PKEY *srvr_pub_pkey = NULL;
1898         unsigned char *encodedPoint = NULL;
1899         int encoded_pt_len = 0;
1900         BN_CTX * bn_ctx = NULL;
1901 #endif
1902
1903         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1904                 {
1905                 d=(unsigned char *)s->init_buf->data;
1906                 p= &(d[4]);
1907
1908                 l=s->s3->tmp.new_cipher->algorithms;
1909
1910                 /* Fool emacs indentation */
1911                 if (0) {}
1912 #ifndef OPENSSL_NO_RSA
1913                 else if (l & SSL_kRSA)
1914                         {
1915                         RSA *rsa;
1916                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1917
1918                         if (s->session->sess_cert == NULL)
1919                                 {
1920                                 /* We should always have a server certificate with SSL_kRSA. */
1921                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1922                                 goto err;
1923                                 }
1924
1925                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1926                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1927                         else
1928                                 {
1929                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1930                                 if ((pkey == NULL) ||
1931                                         (pkey->type != EVP_PKEY_RSA) ||
1932                                         (pkey->pkey.rsa == NULL))
1933                                         {
1934                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1935                                         goto err;
1936                                         }
1937                                 rsa=pkey->pkey.rsa;
1938                                 EVP_PKEY_free(pkey);
1939                                 }
1940
1941                         tmp_buf[0]=s->client_version>>8;
1942                         tmp_buf[1]=s->client_version&0xff;
1943                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1944                                         goto err;
1945
1946                         s->session->master_key_length=sizeof tmp_buf;
1947
1948                         q=p;
1949                         /* Fix buf for TLS and beyond */
1950                         if (s->version > SSL3_VERSION)
1951                                 p+=2;
1952                         n=RSA_public_encrypt(sizeof tmp_buf,
1953                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1954 #ifdef PKCS1_CHECK
1955                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1956                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1957 #endif
1958                         if (n <= 0)
1959                                 {
1960                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1961                                 goto err;
1962                                 }
1963
1964                         /* Fix buf for TLS and beyond */
1965                         if (s->version > SSL3_VERSION)
1966                                 {
1967                                 s2n(n,q);
1968                                 n+=2;
1969                                 }
1970
1971                         s->session->master_key_length=
1972                                 s->method->ssl3_enc->generate_master_secret(s,
1973                                         s->session->master_key,
1974                                         tmp_buf,sizeof tmp_buf);
1975                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1976                         }
1977 #endif
1978 #ifndef OPENSSL_NO_KRB5
1979                 else if (l & SSL_kKRB5)
1980                         {
1981                         krb5_error_code krb5rc;
1982                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1983                         /*  krb5_data   krb5_ap_req;  */
1984                         krb5_data       *enc_ticket;
1985                         krb5_data       authenticator, *authp = NULL;
1986                         EVP_CIPHER_CTX  ciph_ctx;
1987                         EVP_CIPHER      *enc = NULL;
1988                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1989                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1990                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
1991                                                 + EVP_MAX_IV_LENGTH];
1992                         int             padl, outl = sizeof(epms);
1993
1994                         EVP_CIPHER_CTX_init(&ciph_ctx);
1995
1996 #ifdef KSSL_DEBUG
1997                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1998                                 l, SSL_kKRB5);
1999 #endif  /* KSSL_DEBUG */
2000
2001                         authp = NULL;
2002 #ifdef KRB5SENDAUTH
2003                         if (KRB5SENDAUTH)  authp = &authenticator;
2004 #endif  /* KRB5SENDAUTH */
2005
2006                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2007                                 &kssl_err);
2008                         enc = kssl_map_enc(kssl_ctx->enctype);
2009                         if (enc == NULL)
2010                             goto err;
2011 #ifdef KSSL_DEBUG
2012                         {
2013                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2014                         if (krb5rc && kssl_err.text)
2015                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2016                         }
2017 #endif  /* KSSL_DEBUG */
2018
2019                         if (krb5rc)
2020                                 {
2021                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2022                                                 SSL_AD_HANDSHAKE_FAILURE);
2023                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2024                                                 kssl_err.reason);
2025                                 goto err;
2026                                 }
2027
2028                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2029                         **  in place of RFC 2712 KerberosWrapper, as in:
2030                         **
2031                         **  Send ticket (copy to *p, set n = length)
2032                         **  n = krb5_ap_req.length;
2033                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2034                         **  if (krb5_ap_req.data)
2035                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2036                         **
2037                         **  Now using real RFC 2712 KerberosWrapper
2038                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2039                         **  Note: 2712 "opaque" types are here replaced
2040                         **  with a 2-byte length followed by the value.
2041                         **  Example:
2042                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2043                         **  Where "xx xx" = length bytes.  Shown here with
2044                         **  optional authenticator omitted.
2045                         */
2046
2047                         /*  KerberosWrapper.Ticket              */
2048                         s2n(enc_ticket->length,p);
2049                         memcpy(p, enc_ticket->data, enc_ticket->length);
2050                         p+= enc_ticket->length;
2051                         n = enc_ticket->length + 2;
2052
2053                         /*  KerberosWrapper.Authenticator       */
2054                         if (authp  &&  authp->length)
2055                                 {
2056                                 s2n(authp->length,p);
2057                                 memcpy(p, authp->data, authp->length);
2058                                 p+= authp->length;
2059                                 n+= authp->length + 2;
2060
2061                                 free(authp->data);
2062                                 authp->data = NULL;
2063                                 authp->length = 0;
2064                                 }
2065                         else
2066                                 {
2067                                 s2n(0,p);/*  null authenticator length  */
2068                                 n+=2;
2069                                 }
2070
2071                             tmp_buf[0]=s->client_version>>8;
2072                             tmp_buf[1]=s->client_version&0xff;
2073                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2074                                 goto err;
2075
2076                         /*  20010420 VRS.  Tried it this way; failed.
2077                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2078                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2079                         **                              kssl_ctx->length);
2080                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2081                         */
2082
2083                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2084                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2085                                 kssl_ctx->key,iv);
2086                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2087                                 sizeof tmp_buf);
2088                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2089                         outl += padl;
2090                         if (outl > sizeof epms)
2091                                 {
2092                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2093                                 goto err;
2094                                 }
2095                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2096
2097                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2098                         s2n(outl,p);
2099                         memcpy(p, epms, outl);
2100                         p+=outl;
2101                         n+=outl + 2;
2102
2103                         s->session->master_key_length=
2104                                 s->method->ssl3_enc->generate_master_secret(s,
2105                                         s->session->master_key,
2106                                         tmp_buf, sizeof tmp_buf);
2107
2108                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2109                         OPENSSL_cleanse(epms, outl);
2110                         }
2111 #endif
2112 #ifndef OPENSSL_NO_DH
2113                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2114                         {
2115                         DH *dh_srvr,*dh_clnt;
2116
2117                         if (s->session->sess_cert == NULL)
2118                                 {
2119                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2120                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2121                                 goto err;
2122                                 }
2123
2124                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2125                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2126                         else
2127                                 {
2128                                 /* we get them from the cert */
2129                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2130                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2131                                 goto err;
2132                                 }
2133
2134                         /* generate a new random key */
2135                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2136                                 {
2137                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2138                                 goto err;
2139                                 }
2140                         if (!DH_generate_key(dh_clnt))
2141                                 {
2142                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2143                                 goto err;
2144                                 }
2145
2146                         /* use the 'p' output buffer for the DH key, but
2147                          * make sure to clear it out afterwards */
2148
2149                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2150
2151                         if (n <= 0)
2152                                 {
2153                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2154                                 goto err;
2155                                 }
2156
2157                         /* generate master key from the result */
2158                         s->session->master_key_length=
2159                                 s->method->ssl3_enc->generate_master_secret(s,
2160                                         s->session->master_key,p,n);
2161                         /* clean up */
2162                         memset(p,0,n);
2163
2164                         /* send off the data */
2165                         n=BN_num_bytes(dh_clnt->pub_key);
2166                         s2n(n,p);
2167                         BN_bn2bin(dh_clnt->pub_key,p);
2168                         n+=2;
2169
2170                         DH_free(dh_clnt);
2171
2172                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2173                         }
2174 #endif
2175
2176 #ifndef OPENSSL_NO_ECDH
2177                 else if ((l & SSL_kECDH) || (l & SSL_kECDHE))
2178                         {
2179                         const EC_GROUP *srvr_group = NULL;
2180                         EC_KEY *tkey;
2181                         int ecdh_clnt_cert = 0;
2182                         int field_size = 0;
2183
2184                         if (s->session->sess_cert == NULL)
2185                                 {
2186                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2187                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2188                                 goto err;
2189                                 }
2190
2191                         /* Did we send out the client's
2192                          * ECDH share for use in premaster
2193                          * computation as part of client certificate?
2194                          * If so, set ecdh_clnt_cert to 1.
2195                          */
2196                         if ((l & SSL_kECDH) && (s->cert != NULL))
2197                                 {
2198                                 /* XXX: For now, we do not support client
2199                                  * authentication using ECDH certificates.
2200                                  * To add such support, one needs to add
2201                                  * code that checks for appropriate
2202                                  * conditions and sets ecdh_clnt_cert to 1.
2203                                  * For example, the cert have an ECC
2204                                  * key on the same curve as the server's
2205                                  * and the key should be authorized for
2206                                  * key agreement.
2207                                  *
2208                                  * One also needs to add code in ssl3_connect
2209                                  * to skip sending the certificate verify
2210                                  * message.
2211                                  *
2212                                  * if ((s->cert->key->privatekey != NULL) &&
2213                                  *     (s->cert->key->privatekey->type ==
2214                                  *      EVP_PKEY_EC) && ...)
2215                                  * ecdh_clnt_cert = 1;
2216                                  */
2217                                 }
2218
2219                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2220                                 {
2221                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2222                                 }
2223                         else
2224                                 {
2225                                 /* Get the Server Public Key from Cert */
2226                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2227                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2228                                 if ((srvr_pub_pkey == NULL) ||
2229                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2230                                     (srvr_pub_pkey->pkey.ec == NULL))
2231                                         {
2232                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2233                                             ERR_R_INTERNAL_ERROR);
2234                                         goto err;
2235                                         }
2236
2237                                 tkey = srvr_pub_pkey->pkey.ec;
2238                                 }
2239
2240                         srvr_group   = EC_KEY_get0_group(tkey);
2241                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2242
2243                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2244                                 {
2245                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2246                                     ERR_R_INTERNAL_ERROR);
2247                                 goto err;
2248                                 }
2249
2250                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2251                                 {
2252                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2253                                 goto err;
2254                                 }
2255
2256                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2257                                 {
2258                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2259                                 goto err;
2260                                 }
2261                         if (ecdh_clnt_cert)
2262                                 {
2263                                 /* Reuse key info from our certificate
2264                                  * We only need our private key to perform
2265                                  * the ECDH computation.
2266                                  */
2267                                 const BIGNUM *priv_key;
2268                                 tkey = s->cert->key->privatekey->pkey.ec;
2269                                 priv_key = EC_KEY_get0_private_key(tkey);
2270                                 if (priv_key == NULL)
2271                                         {
2272                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2273                                         goto err;
2274                                         }
2275                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2276                                         {
2277                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2278                                         goto err;
2279                                         }
2280                                 }
2281                         else
2282                                 {
2283                                 /* Generate a new ECDH key pair */
2284                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2285                                         {
2286                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2287                                         goto err;
2288                                         }
2289                                 }
2290
2291                         /* use the 'p' output buffer for the ECDH key, but
2292                          * make sure to clear it out afterwards
2293                          */
2294
2295                         field_size = EC_GROUP_get_degree(srvr_group);
2296                         if (field_size <= 0)
2297                                 {
2298                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2299                                        ERR_R_ECDH_LIB);
2300                                 goto err;
2301                                 }
2302                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2303                         if (n <= 0)
2304                                 {
2305                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2306                                        ERR_R_ECDH_LIB);
2307                                 goto err;
2308                                 }
2309
2310                         /* generate master key from the result */
2311                         s->session->master_key_length = s->method->ssl3_enc \
2312                             -> generate_master_secret(s,
2313                                 s->session->master_key,
2314                                 p, n);
2315
2316                         memset(p, 0, n); /* clean up */
2317
2318                         if (ecdh_clnt_cert)
2319                                 {
2320                                 /* Send empty client key exch message */
2321                                 n = 0;
2322                                 }
2323                         else
2324                                 {
2325                                 /* First check the size of encoding and
2326                                  * allocate memory accordingly.
2327                                  */
2328                                 encoded_pt_len =
2329                                     EC_POINT_point2oct(srvr_group,
2330                                         EC_KEY_get0_public_key(clnt_ecdh),
2331                                         POINT_CONVERSION_UNCOMPRESSED,
2332                                         NULL, 0, NULL);
2333
2334                                 encodedPoint = (unsigned char *)
2335                                     OPENSSL_malloc(encoded_pt_len *
2336                                         sizeof(unsigned char));
2337                                 bn_ctx = BN_CTX_new();
2338                                 if ((encodedPoint == NULL) ||
2339                                     (bn_ctx == NULL))
2340                                         {
2341                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2342                                         goto err;
2343                                         }
2344
2345                                 /* Encode the public key */
2346                                 n = EC_POINT_point2oct(srvr_group,
2347                                     EC_KEY_get0_public_key(clnt_ecdh),
2348                                     POINT_CONVERSION_UNCOMPRESSED,
2349                                     encodedPoint, encoded_pt_len, bn_ctx);
2350
2351                                 *p = n; /* length of encoded point */
2352                                 /* Encoded point will be copied here */
2353                                 p += 1;
2354                                 /* copy the point */
2355                                 memcpy((unsigned char *)p, encodedPoint, n);
2356                                 /* increment n to account for length field */
2357                                 n += 1;
2358                                 }
2359
2360                         /* Free allocated memory */
2361                         BN_CTX_free(bn_ctx);
2362                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2363                         if (clnt_ecdh != NULL)
2364                                  EC_KEY_free(clnt_ecdh);
2365                         EVP_PKEY_free(srvr_pub_pkey);
2366                         }
2367 #endif /* !OPENSSL_NO_ECDH */
2368                 else
2369                         {
2370                         ssl3_send_alert(s, SSL3_AL_FATAL,
2371                             SSL_AD_HANDSHAKE_FAILURE);
2372                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2373                             ERR_R_INTERNAL_ERROR);
2374                         goto err;
2375                         }
2376
2377                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2378                 l2n3(n,d);
2379
2380                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2381                 /* number of bytes to write */
2382                 s->init_num=n+4;
2383                 s->init_off=0;
2384                 }
2385
2386         /* SSL3_ST_CW_KEY_EXCH_B */
2387         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2388 err:
2389 #ifndef OPENSSL_NO_ECDH
2390         BN_CTX_free(bn_ctx);
2391         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2392         if (clnt_ecdh != NULL)
2393                 EC_KEY_free(clnt_ecdh);
2394         EVP_PKEY_free(srvr_pub_pkey);
2395 #endif
2396         return(-1);
2397         }
2398
2399 int ssl3_send_client_verify(SSL *s)
2400         {
2401         unsigned char *p,*d;
2402         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2403         EVP_PKEY *pkey;
2404 #ifndef OPENSSL_NO_RSA
2405         unsigned u=0;
2406 #endif
2407         unsigned long n;
2408 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
2409         int j;
2410 #endif
2411
2412         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2413                 {
2414                 d=(unsigned char *)s->init_buf->data;
2415                 p= &(d[4]);
2416                 pkey=s->cert->key->privatekey;
2417
2418                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
2419                         &(data[MD5_DIGEST_LENGTH]));
2420
2421 #ifndef OPENSSL_NO_RSA
2422                 if (pkey->type == EVP_PKEY_RSA)
2423                         {
2424                         s->method->ssl3_enc->cert_verify_mac(s,
2425                                 &(s->s3->finish_dgst1),&(data[0]));
2426                         if (RSA_sign(NID_md5_sha1, data,
2427                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2428                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2429                                 {
2430                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2431                                 goto err;
2432                                 }
2433                         s2n(u,p);
2434                         n=u+2;
2435                         }
2436                 else
2437 #endif
2438 #ifndef OPENSSL_NO_DSA
2439                         if (pkey->type == EVP_PKEY_DSA)
2440                         {
2441                         if (!DSA_sign(pkey->save_type,
2442                                 &(data[MD5_DIGEST_LENGTH]),
2443                                 SHA_DIGEST_LENGTH,&(p[2]),
2444                                 (unsigned int *)&j,pkey->pkey.dsa))
2445                                 {
2446                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2447                                 goto err;
2448                                 }
2449                         s2n(j,p);
2450                         n=j+2;
2451                         }
2452                 else
2453 #endif
2454 #ifndef OPENSSL_NO_ECDSA
2455                         if (pkey->type == EVP_PKEY_EC)
2456                         {
2457                         if (!ECDSA_sign(pkey->save_type,
2458                                 &(data[MD5_DIGEST_LENGTH]),
2459                                 SHA_DIGEST_LENGTH,&(p[2]),
2460                                 (unsigned int *)&j,pkey->pkey.ec))
2461                                 {
2462                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2463                                     ERR_R_ECDSA_LIB);
2464                                 goto err;
2465                                 }
2466                         s2n(j,p);
2467                         n=j+2;
2468                         }
2469                 else
2470 #endif
2471                         {
2472                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2473                         goto err;
2474                         }
2475                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2476                 l2n3(n,d);
2477
2478                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2479                 s->init_num=(int)n+4;
2480                 s->init_off=0;
2481                 }
2482         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2483 err:
2484         return(-1);
2485         }
2486
2487 int ssl3_send_client_certificate(SSL *s)
2488         {
2489         X509 *x509=NULL;
2490         EVP_PKEY *pkey=NULL;
2491         int i;
2492         unsigned long l;
2493
2494         if (s->state == SSL3_ST_CW_CERT_A)
2495                 {
2496                 if ((s->cert == NULL) ||
2497                         (s->cert->key->x509 == NULL) ||
2498                         (s->cert->key->privatekey == NULL))
2499                         s->state=SSL3_ST_CW_CERT_B;
2500                 else
2501                         s->state=SSL3_ST_CW_CERT_C;
2502                 }
2503
2504         /* We need to get a client cert */
2505         if (s->state == SSL3_ST_CW_CERT_B)
2506                 {
2507                 /* If we get an error, we need to
2508                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2509                  * We then get retied later */
2510                 i=0;
2511                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
2512                 if (i < 0)
2513                         {
2514                         s->rwstate=SSL_X509_LOOKUP;
2515                         return(-1);
2516                         }
2517                 s->rwstate=SSL_NOTHING;
2518                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2519                         {
2520                         s->state=SSL3_ST_CW_CERT_B;
2521                         if (    !SSL_use_certificate(s,x509) ||
2522                                 !SSL_use_PrivateKey(s,pkey))
2523                                 i=0;
2524                         }
2525                 else if (i == 1)
2526                         {
2527                         i=0;
2528                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2529                         }
2530
2531                 if (x509 != NULL) X509_free(x509);
2532                 if (pkey != NULL) EVP_PKEY_free(pkey);
2533                 if (i == 0)
2534                         {
2535                         if (s->version == SSL3_VERSION)
2536                                 {
2537                                 s->s3->tmp.cert_req=0;
2538                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2539                                 return(1);
2540                                 }
2541                         else
2542                                 {
2543                                 s->s3->tmp.cert_req=2;
2544                                 }
2545                         }
2546
2547                 /* Ok, we have a cert */
2548                 s->state=SSL3_ST_CW_CERT_C;
2549                 }
2550
2551         if (s->state == SSL3_ST_CW_CERT_C)
2552                 {
2553                 s->state=SSL3_ST_CW_CERT_D;
2554                 l=ssl3_output_cert_chain(s,
2555                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2556                 s->init_num=(int)l;
2557                 s->init_off=0;
2558                 }
2559         /* SSL3_ST_CW_CERT_D */
2560         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2561         }
2562
2563 #define has_bits(i,m)   (((i)&(m)) == (m))
2564
2565 int ssl3_check_cert_and_algorithm(SSL *s)
2566         {
2567         int i,idx;
2568         long algs;
2569         EVP_PKEY *pkey=NULL;
2570         SESS_CERT *sc;
2571 #ifndef OPENSSL_NO_RSA
2572         RSA *rsa;
2573 #endif
2574 #ifndef OPENSSL_NO_DH
2575         DH *dh;
2576 #endif
2577
2578         sc=s->session->sess_cert;
2579
2580         algs=s->s3->tmp.new_cipher->algorithms;
2581
2582         /* we don't have a certificate */
2583         if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
2584                 return(1);
2585
2586         if (sc == NULL)
2587                 {
2588                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2589                 goto err;
2590                 }
2591
2592 #ifndef OPENSSL_NO_RSA
2593         rsa=s->session->sess_cert->peer_rsa_tmp;
2594 #endif
2595 #ifndef OPENSSL_NO_DH
2596         dh=s->session->sess_cert->peer_dh_tmp;
2597 #endif
2598
2599         /* This is the passed certificate */
2600
2601         idx=sc->peer_cert_type;
2602 #ifndef OPENSSL_NO_ECDH
2603         if (idx == SSL_PKEY_ECC)
2604                 {
2605                 if (check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2606                     s->s3->tmp.new_cipher) == 0)
2607                         { /* check failed */
2608                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2609                         goto f_err;
2610                         }
2611                 else
2612                         {
2613                         return 1;
2614                         }
2615                 }
2616 #endif
2617         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2618         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2619         EVP_PKEY_free(pkey);
2620
2621
2622         /* Check that we have a certificate if we require one */
2623         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2624                 {
2625                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2626                 goto f_err;
2627                 }
2628 #ifndef OPENSSL_NO_DSA
2629         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2630                 {
2631                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2632                 goto f_err;
2633                 }
2634 #endif
2635 #ifndef OPENSSL_NO_RSA
2636         if ((algs & SSL_kRSA) &&
2637                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2638                 {
2639                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2640                 goto f_err;
2641                 }
2642 #endif
2643 #ifndef OPENSSL_NO_DH
2644         if ((algs & SSL_kEDH) &&
2645                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2646                 {
2647                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2648                 goto f_err;
2649                 }
2650         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2651                 {
2652                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2653                 goto f_err;
2654                 }
2655 #ifndef OPENSSL_NO_DSA
2656         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2657                 {
2658                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2659                 goto f_err;
2660                 }
2661 #endif
2662 #endif
2663
2664         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2665                 {
2666 #ifndef OPENSSL_NO_RSA
2667                 if (algs & SSL_kRSA)
2668                         {
2669                         if (rsa == NULL
2670                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2671                                 {
2672                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2673                                 goto f_err;
2674                                 }
2675                         }
2676                 else
2677 #endif
2678 #ifndef OPENSSL_NO_DH
2679                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2680                             {
2681                             if (dh == NULL
2682                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2683                                 {
2684                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2685                                 goto f_err;
2686                                 }
2687                         }
2688                 else
2689 #endif
2690                         {
2691                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2692                         goto f_err;
2693                         }
2694                 }
2695         return(1);
2696 f_err:
2697         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2698 err:
2699         return(0);
2700         }
2701
2702
2703 #ifndef OPENSSL_NO_ECDH
2704 /* This is the complement of nid2curve_id in s3_srvr.c. */
2705 static int curve_id2nid(int curve_id)
2706 {
2707         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2708          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2709         static int nid_list[26] =
2710         {
2711                 0,
2712                 NID_sect163k1, /* sect163k1 (1) */
2713                 NID_sect163r1, /* sect163r1 (2) */
2714                 NID_sect163r2, /* sect163r2 (3) */
2715                 NID_sect193r1, /* sect193r1 (4) */
2716                 NID_sect193r2, /* sect193r2 (5) */
2717                 NID_sect233k1, /* sect233k1 (6) */
2718                 NID_sect233r1, /* sect233r1 (7) */
2719                 NID_sect239k1, /* sect239k1 (8) */
2720                 NID_sect283k1, /* sect283k1 (9) */
2721                 NID_sect283r1, /* sect283r1 (10) */
2722                 NID_sect409k1, /* sect409k1 (11) */
2723                 NID_sect409r1, /* sect409r1 (12) */
2724                 NID_sect571k1, /* sect571k1 (13) */
2725                 NID_sect571r1, /* sect571r1 (14) */
2726                 NID_secp160k1, /* secp160k1 (15) */
2727                 NID_secp160r1, /* secp160r1 (16) */
2728                 NID_secp160r2, /* secp160r2 (17) */
2729                 NID_secp192k1, /* secp192k1 (18) */
2730                 NID_X9_62_prime192v1, /* secp192r1 (19) */
2731                 NID_secp224k1, /* secp224k1 (20) */
2732                 NID_secp224r1, /* secp224r1 (21) */
2733                 NID_secp256k1, /* secp256k1 (22) */
2734                 NID_X9_62_prime256v1, /* secp256r1 (23) */
2735                 NID_secp384r1, /* secp384r1 (24) */
2736                 NID_secp521r1  /* secp521r1 (25) */
2737         };
2738
2739         if ((curve_id < 1) || (curve_id > 25)) return 0;
2740
2741         return nid_list[curve_id];
2742 }
2743 #endif
2744
2745 /* Check to see if handshake is full or resumed. Usually this is just a
2746  * case of checking to see if a cache hit has occurred. In the case of
2747  * session tickets we have to check the next message to be sure.
2748  */
2749
2750 #ifndef OPENSSL_NO_TLSEXT
2751 int ssl3_check_finished(SSL *s)
2752         {
2753         int ok;
2754         long n;
2755         /* If we have no ticket or session ID is non-zero length (a match of
2756          * a non-zero session length would never reach here) it cannot be a
2757          * resumed session.
2758          */
2759         if (!s->session->tlsext_tick || s->session->session_id_length)
2760                 return 1;
2761         /* this function is called when we really expect a Certificate
2762          * message, so permit appropriate message length */
2763         n=s->method->ssl_get_message(s,
2764                 SSL3_ST_CR_CERT_A,
2765                 SSL3_ST_CR_CERT_B,
2766                 -1,
2767                 s->max_cert_list,
2768                 &ok);
2769         if (!ok) return((int)n);
2770         s->s3->tmp.reuse_message = 1;
2771         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
2772                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
2773                 return 2;
2774
2775         return 1;
2776         }
2777 #endif
2778
2779 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
2780         {
2781         int i = 0;
2782 #ifndef OPENSSL_NO_ENGINE
2783         if (s->ctx->client_cert_engine)
2784                 {
2785                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
2786                                                 SSL_get_client_CA_list(s),
2787                                                 px509, ppkey, NULL, NULL, NULL);
2788                 if (i != 0)
2789                         return i;
2790                 }
2791 #endif
2792         if (s->ctx->client_cert_cb)
2793                 i = s->ctx->client_cert_cb(s,px509,ppkey);
2794         return i;
2795         }