crypto/openssl/ssl/s3_clnt.c

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