ssl/s3_clnt.c

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