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