crypto/openssl/ssl/s3_clnt.c

   1 /* ssl/s3_clnt.c */
   2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   3  * All rights reserved.
   4  *
   5  * This package is an SSL implementation written
   6  * by Eric Young (eay@cryptsoft.com).
   7  * The implementation was written so as to conform with Netscapes SSL.
   8  *
   9  * This library is free for commercial and non-commercial use as long as
  10  * the following conditions are aheared to.  The following conditions
  11  * apply to all code found in this distribution, be it the RC4, RSA,
  12  * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
  13  * included with this distribution is covered by the same copyright terms
  14  * except that the holder is Tim Hudson (tjh@cryptsoft.com).
  15  *
  16  * Copyright remains Eric Young's, and as such any Copyright notices in
  17  * the code are not to be removed.
  18  * If this package is used in a product, Eric Young should be given attribution
  19  * as the author of the parts of the library used.
  20  * This can be in the form of a textual message at program startup or
  21  * in documentation (online or textual) provided with the package.
  22  *
  23  * Redistribution and use in source and binary forms, with or without
  24  * modification, are permitted provided that the following conditions
  25  * are met:
  26  * 1. Redistributions of source code must retain the copyright
  27  *    notice, this list of conditions and the following disclaimer.
  28  * 2. Redistributions in binary form must reproduce the above copyright
  29  *    notice, this list of conditions and the following disclaimer in the
  30  *    documentation and/or other materials provided with the distribution.
  31  * 3. All advertising materials mentioning features or use of this software
  32  *    must display the following acknowledgement:
  33  *    "This product includes cryptographic software written by
  34  *     Eric Young (eay@cryptsoft.com)"
  35  *    The word 'cryptographic' can be left out if the rouines from the library
  36  *    being used are not cryptographic related :-).
  37  * 4. If you include any Windows specific code (or a derivative thereof) from
  38  *    the apps directory (application code) you must include an acknowledgement:
  39  *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
  40  *
  41  * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
  42  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  43  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  44  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  45  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  46  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  47  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  48  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  49  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  50  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  51  * SUCH DAMAGE.
  52  *
  53  * The licence and distribution terms for any publically available version or
  54  * derivative of this code cannot be changed.  i.e. this code cannot simply be
  55  * copied and put under another distribution licence
  56  * [including the GNU Public Licence.]
  57  */
  58 /* ====================================================================
  59  * Copyright (c) 1998-2003 The OpenSSL Project.  All rights reserved.
  60  *
  61  * Redistribution and use in source and binary forms, with or without
  62  * modification, are permitted provided that the following conditions
  63  * are met:
  64  *
  65  * 1. Redistributions of source code must retain the above copyright
  66  *    notice, this list of conditions and the following disclaimer.
  67  *
  68  * 2. Redistributions in binary form must reproduce the above copyright
  69  *    notice, this list of conditions and the following disclaimer in
  70  *    the documentation and/or other materials provided with the
  71  *    distribution.
  72  *
  73  * 3. All advertising materials mentioning features or use of this
  74  *    software must display the following acknowledgment:
  75  *    "This product includes software developed by the OpenSSL Project
  76  *    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
  77  *
  78  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  79  *    endorse or promote products derived from this software without
  80  *    prior written permission. For written permission, please contact
  81  *    openssl-core@openssl.org.
  82  *
  83  * 5. Products derived from this software may not be called "OpenSSL"
  84  *    nor may "OpenSSL" appear in their names without prior written
  85  *    permission of the OpenSSL Project.
  86  *
  87  * 6. Redistributions of any form whatsoever must retain the following
  88  *    acknowledgment:
  89  *    "This product includes software developed by the OpenSSL Project
  90  *    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
  91  *
  92  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  93  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  94  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  95  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  96  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  97  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  98  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  99  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 100  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 101  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 102  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 103  * OF THE POSSIBILITY OF SUCH DAMAGE.
 104  * ====================================================================
 105  *
 106  * This product includes cryptographic software written by Eric Young
 107  * (eay@cryptsoft.com).  This product includes software written by Tim
 108  * Hudson (tjh@cryptsoft.com).
 109  *
 110  */
 111 /* ====================================================================
 112  * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 113  *
 114  * Portions of the attached software ("Contribution") are developed by
 115  * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 116  *
 117  * The Contribution is licensed pursuant to the OpenSSL open source
 118  * license provided above.
 119  *
 120  * ECC cipher suite support in OpenSSL originally written by
 121  * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 122  *
 123  */
 124
 125 #include <stdio.h>
 126 #include "ssl_locl.h"
 127 #include "kssl_lcl.h"
 128 #include <openssl/buffer.h>
 129 #include <openssl/rand.h>
 130 #include <openssl/objects.h>
 131 #include <openssl/evp.h>
 132 #include <openssl/md5.h>
 133 #ifdef OPENSSL_FIPS
 134 #include <openssl/fips.h>
 135 #endif
 136
 137 #ifndef OPENSSL_NO_DH
 138 #include <openssl/dh.h>
 139 #endif
 140 #include <openssl/bn.h>
 141 #ifndef OPENSSL_NO_ENGINE
 142 #include <openssl/engine.h>
 143 #endif
 144
 145 static SSL_METHOD *ssl3_get_client_method(int ver);
 146 static int ca_dn_cmp(const X509_NAME * const *a,const X509_NAME * const *b);
 147
 148 #ifndef OPENSSL_NO_ECDH
 149 static int curve_id2nid(int curve_id);
 150 int check_srvr_ecc_cert_and_alg(X509 *x, SSL_CIPHER *cs);
 151 #endif
 152
 153 static SSL_METHOD *ssl3_get_client_method(int ver)
 154         {
 155         if (ver == SSL3_VERSION)
 156                 return(SSLv3_client_method());
 157         else
 158                 return(NULL);
 159         }
 160
 161 IMPLEMENT_ssl3_meth_func(SSLv3_client_method,
 162                         ssl_undefined_function,
 163                         ssl3_connect,
 164                         ssl3_get_client_method)
 165
 166 int ssl3_connect(SSL *s)
 167         {
 168         BUF_MEM *buf=NULL;
 169         unsigned long Time=(unsigned long)time(NULL);
 170         void (*cb)(const SSL *ssl,int type,int val)=NULL;
 171         int ret= -1;
 172         int new_state,state,skip=0;
 173
 174         RAND_add(&Time,sizeof(Time),0);
 175         ERR_clear_error();
 176         clear_sys_error();
 177
 178         if (s->info_callback != NULL)
 179                 cb=s->info_callback;
 180         else if (s->ctx->info_callback != NULL)
 181                 cb=s->ctx->info_callback;
 182
 183         s->in_handshake++;
 184         if (!SSL_in_init(s) || SSL_in_before(s)) SSL_clear(s);
 185
 186         for (;;)
 187                 {
 188                 state=s->state;
 189
 190                 switch(s->state)
 191                         {
 192                 case SSL_ST_RENEGOTIATE:
 193                         s->new_session=1;
 194                         s->state=SSL_ST_CONNECT;
 195                         s->ctx->stats.sess_connect_renegotiate++;
 196                         /* break */
 197                 case SSL_ST_BEFORE:
 198                 case SSL_ST_CONNECT:
 199                 case SSL_ST_BEFORE|SSL_ST_CONNECT:
 200                 case SSL_ST_OK|SSL_ST_CONNECT:
 201
 202                         s->server=0;
 203                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_START,1);
 204
 205                         if ((s->version & 0xff00 ) != 0x0300)
 206                                 {
 207                                 SSLerr(SSL_F_SSL3_CONNECT, ERR_R_INTERNAL_ERROR);
 208                                 ret = -1;
 209                                 goto end;
 210                                 }
 211
 212                         /* s->version=SSL3_VERSION; */
 213                         s->type=SSL_ST_CONNECT;
 214
 215                         if (s->init_buf == NULL)
 216                                 {
 217                                 if ((buf=BUF_MEM_new()) == NULL)
 218                                         {
 219                                         ret= -1;
 220                                         goto end;
 221                                         }
 222                                 if (!BUF_MEM_grow(buf,SSL3_RT_MAX_PLAIN_LENGTH))
 223                                         {
 224                                         ret= -1;
 225                                         goto end;
 226                                         }
 227                                 s->init_buf=buf;
 228                                 buf=NULL;
 229                                 }
 230
 231                         if (!ssl3_setup_buffers(s)) { ret= -1; goto end; }
 232
 233                         /* setup buffing BIO */
 234                         if (!ssl_init_wbio_buffer(s,0)) { ret= -1; goto end; }
 235
 236                         /* don't push the buffering BIO quite yet */
 237
 238                         ssl3_init_finished_mac(s);
 239
 240                         s->state=SSL3_ST_CW_CLNT_HELLO_A;
 241                         s->ctx->stats.sess_connect++;
 242                         s->init_num=0;
 243                         break;
 244
 245                 case SSL3_ST_CW_CLNT_HELLO_A:
 246                 case SSL3_ST_CW_CLNT_HELLO_B:
 247
 248                         s->shutdown=0;
 249                         ret=ssl3_client_hello(s);
 250                         if (ret <= 0) goto end;
 251                         s->state=SSL3_ST_CR_SRVR_HELLO_A;
 252                         s->init_num=0;
 253
 254                         /* turn on buffering for the next lot of output */
 255                         if (s->bbio != s->wbio)
 256                                 s->wbio=BIO_push(s->bbio,s->wbio);
 257
 258                         break;
 259
 260                 case SSL3_ST_CR_SRVR_HELLO_A:
 261                 case SSL3_ST_CR_SRVR_HELLO_B:
 262                         ret=ssl3_get_server_hello(s);
 263                         if (ret <= 0) goto end;
 264                         if (s->hit)
 265                                 {
 266                                 s->state=SSL3_ST_CR_FINISHED_A;
 267 #ifndef OPENSSL_NO_TLSEXT
 268                                 if (s->tlsext_ticket_expected)
 269                                         {
 270                                         /* receive renewed session ticket */
 271                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 272                                         }
 273 #endif
 274                                 }
 275                         else
 276                                 s->state=SSL3_ST_CR_CERT_A;
 277                         s->init_num=0;
 278                         break;
 279
 280                 case SSL3_ST_CR_CERT_A:
 281                 case SSL3_ST_CR_CERT_B:
 282 #ifndef OPENSSL_NO_TLSEXT
 283                         ret=ssl3_check_finished(s);
 284                         if (ret <= 0) goto end;
 285                         if (ret == 2)
 286                                 {
 287                                 s->hit = 1;
 288                                 if (s->tlsext_ticket_expected)
 289                                         s->state=SSL3_ST_CR_SESSION_TICKET_A;
 290                                 else
 291                                         s->state=SSL3_ST_CR_FINISHED_A;
 292                                 s->init_num=0;
 293                                 break;
 294                                 }
 295 #endif
 296                         /* Check if it is anon DH/ECDH */
 297                         if (!(s->s3->tmp.new_cipher->algorithms & SSL_aNULL))
 298                                 {
 299                                 ret=ssl3_get_server_certificate(s);
 300                                 if (ret <= 0) goto end;
 301 #ifndef OPENSSL_NO_TLSEXT
 302                                 if (s->tlsext_status_expected)
 303                                         s->state=SSL3_ST_CR_CERT_STATUS_A;
 304                                 else
 305                                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 306                                 }
 307                         else
 308                                 {
 309                                 skip = 1;
 310                                 s->state=SSL3_ST_CR_KEY_EXCH_A;
 311                                 }
 312 #else
 313                                 }
 314                         else
 315                                 skip=1;
 316
 317                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 318 #endif
 319                         s->init_num=0;
 320                         break;
 321
 322                 case SSL3_ST_CR_KEY_EXCH_A:
 323                 case SSL3_ST_CR_KEY_EXCH_B:
 324                         ret=ssl3_get_key_exchange(s);
 325                         if (ret <= 0) goto end;
 326                         s->state=SSL3_ST_CR_CERT_REQ_A;
 327                         s->init_num=0;
 328
 329                         /* at this point we check that we have the
 330                          * required stuff from the server */
 331                         if (!ssl3_check_cert_and_algorithm(s))
 332                                 {
 333                                 ret= -1;
 334                                 goto end;
 335                                 }
 336                         break;
 337
 338                 case SSL3_ST_CR_CERT_REQ_A:
 339                 case SSL3_ST_CR_CERT_REQ_B:
 340                         ret=ssl3_get_certificate_request(s);
 341                         if (ret <= 0) goto end;
 342                         s->state=SSL3_ST_CR_SRVR_DONE_A;
 343                         s->init_num=0;
 344                         break;
 345
 346                 case SSL3_ST_CR_SRVR_DONE_A:
 347                 case SSL3_ST_CR_SRVR_DONE_B:
 348                         ret=ssl3_get_server_done(s);
 349                         if (ret <= 0) goto end;
 350                         if (s->s3->tmp.cert_req)
 351                                 s->state=SSL3_ST_CW_CERT_A;
 352                         else
 353                                 s->state=SSL3_ST_CW_KEY_EXCH_A;
 354                         s->init_num=0;
 355
 356                         break;
 357
 358                 case SSL3_ST_CW_CERT_A:
 359                 case SSL3_ST_CW_CERT_B:
 360                 case SSL3_ST_CW_CERT_C:
 361                 case SSL3_ST_CW_CERT_D:
 362                         ret=ssl3_send_client_certificate(s);
 363                         if (ret <= 0) goto end;
 364                         s->state=SSL3_ST_CW_KEY_EXCH_A;
 365                         s->init_num=0;
 366                         break;
 367
 368                 case SSL3_ST_CW_KEY_EXCH_A:
 369                 case SSL3_ST_CW_KEY_EXCH_B:
 370                         ret=ssl3_send_client_key_exchange(s);
 371                         if (ret <= 0) goto end;
 372                         /* EAY EAY EAY need to check for DH fix cert
 373                          * sent back */
 374                         /* For TLS, cert_req is set to 2, so a cert chain
 375                          * of nothing is sent, but no verify packet is sent */
 376                         /* XXX: For now, we do not support client
 377                          * authentication in ECDH cipher suites with
 378                          * ECDH (rather than ECDSA) certificates.
 379                          * We need to skip the certificate verify
 380                          * message when client's ECDH public key is sent
 381                          * inside the client certificate.
 382                          */
 383                         if (s->s3->tmp.cert_req == 1)
 384                                 {
 385                                 s->state=SSL3_ST_CW_CERT_VRFY_A;
 386                                 }
 387                         else
 388                                 {
 389                                 s->state=SSL3_ST_CW_CHANGE_A;
 390                                 s->s3->change_cipher_spec=0;
 391                                 }
 392
 393                         s->init_num=0;
 394                         break;
 395
 396                 case SSL3_ST_CW_CERT_VRFY_A:
 397                 case SSL3_ST_CW_CERT_VRFY_B:
 398                         ret=ssl3_send_client_verify(s);
 399                         if (ret <= 0) goto end;
 400                         s->state=SSL3_ST_CW_CHANGE_A;
 401                         s->init_num=0;
 402                         s->s3->change_cipher_spec=0;
 403                         break;
 404
 405                 case SSL3_ST_CW_CHANGE_A:
 406                 case SSL3_ST_CW_CHANGE_B:
 407                         ret=ssl3_send_change_cipher_spec(s,
 408                                 SSL3_ST_CW_CHANGE_A,SSL3_ST_CW_CHANGE_B);
 409                         if (ret <= 0) goto end;
 410                         s->state=SSL3_ST_CW_FINISHED_A;
 411                         s->init_num=0;
 412
 413                         s->session->cipher=s->s3->tmp.new_cipher;
 414 #ifdef OPENSSL_NO_COMP
 415                         s->session->compress_meth=0;
 416 #else
 417                         if (s->s3->tmp.new_compression == NULL)
 418                                 s->session->compress_meth=0;
 419                         else
 420                                 s->session->compress_meth=
 421                                         s->s3->tmp.new_compression->id;
 422 #endif
 423                         if (!s->method->ssl3_enc->setup_key_block(s))
 424                                 {
 425                                 ret= -1;
 426                                 goto end;
 427                                 }
 428
 429                         if (!s->method->ssl3_enc->change_cipher_state(s,
 430                                 SSL3_CHANGE_CIPHER_CLIENT_WRITE))
 431                                 {
 432                                 ret= -1;
 433                                 goto end;
 434                                 }
 435
 436                         break;
 437
 438                 case SSL3_ST_CW_FINISHED_A:
 439                 case SSL3_ST_CW_FINISHED_B:
 440                         ret=ssl3_send_finished(s,
 441                                 SSL3_ST_CW_FINISHED_A,SSL3_ST_CW_FINISHED_B,
 442                                 s->method->ssl3_enc->client_finished_label,
 443                                 s->method->ssl3_enc->client_finished_label_len);
 444                         if (ret <= 0) goto end;
 445                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 446                         s->state=SSL3_ST_CW_FLUSH;
 447
 448                         /* clear flags */
 449                         s->s3->flags&= ~SSL3_FLAGS_POP_BUFFER;
 450                         if (s->hit)
 451                                 {
 452                                 s->s3->tmp.next_state=SSL_ST_OK;
 453                                 if (s->s3->flags & SSL3_FLAGS_DELAY_CLIENT_FINISHED)
 454                                         {
 455                                         s->state=SSL_ST_OK;
 456                                         s->s3->flags|=SSL3_FLAGS_POP_BUFFER;
 457                                         s->s3->delay_buf_pop_ret=0;
 458                                         }
 459                                 }
 460                         else
 461                                 {
 462 #ifndef OPENSSL_NO_TLSEXT
 463                                 /* Allow NewSessionTicket if ticket expected */
 464                                 if (s->tlsext_ticket_expected)
 465                                         s->s3->tmp.next_state=SSL3_ST_CR_SESSION_TICKET_A;
 466                                 else
 467 #endif
 468
 469                                 s->s3->tmp.next_state=SSL3_ST_CR_FINISHED_A;
 470                                 }
 471                         s->init_num=0;
 472                         break;
 473
 474 #ifndef OPENSSL_NO_TLSEXT
 475                 case SSL3_ST_CR_SESSION_TICKET_A:
 476                 case SSL3_ST_CR_SESSION_TICKET_B:
 477                         ret=ssl3_get_new_session_ticket(s);
 478                         if (ret <= 0) goto end;
 479                         s->state=SSL3_ST_CR_FINISHED_A;
 480                         s->init_num=0;
 481                 break;
 482
 483                 case SSL3_ST_CR_CERT_STATUS_A:
 484                 case SSL3_ST_CR_CERT_STATUS_B:
 485                         ret=ssl3_get_cert_status(s);
 486                         if (ret <= 0) goto end;
 487                         s->state=SSL3_ST_CR_KEY_EXCH_A;
 488                         s->init_num=0;
 489                 break;
 490 #endif
 491
 492                 case SSL3_ST_CR_FINISHED_A:
 493                 case SSL3_ST_CR_FINISHED_B:
 494
 495                         s->s3->flags |= SSL3_FLAGS_CCS_OK;
 496                         ret=ssl3_get_finished(s,SSL3_ST_CR_FINISHED_A,
 497                                 SSL3_ST_CR_FINISHED_B);
 498                         if (ret <= 0) goto end;
 499
 500                         if (s->hit)
 501                                 s->state=SSL3_ST_CW_CHANGE_A;
 502                         else
 503                                 s->state=SSL_ST_OK;
 504                         s->init_num=0;
 505                         break;
 506
 507                 case SSL3_ST_CW_FLUSH:
 508                         s->rwstate=SSL_WRITING;
 509                         if (BIO_flush(s->wbio) <= 0)
 510                                 {
 511                                 ret= -1;
 512                                 goto end;
 513                                 }
 514                         s->rwstate=SSL_NOTHING;
 515                         s->state=s->s3->tmp.next_state;
 516                         break;
 517
 518                 case SSL_ST_OK:
 519                         /* clean a few things up */
 520                         ssl3_cleanup_key_block(s);
 521
 522                         if (s->init_buf != NULL)
 523                                 {
 524                                 BUF_MEM_free(s->init_buf);
 525                                 s->init_buf=NULL;
 526                                 }
 527
 528                         /* If we are not 'joining' the last two packets,
 529                          * remove the buffering now */
 530                         if (!(s->s3->flags & SSL3_FLAGS_POP_BUFFER))
 531                                 ssl_free_wbio_buffer(s);
 532                         /* else do it later in ssl3_write */
 533
 534                         s->init_num=0;
 535                         s->new_session=0;
 536
 537                         ssl_update_cache(s,SSL_SESS_CACHE_CLIENT);
 538                         if (s->hit) s->ctx->stats.sess_hit++;
 539
 540                         ret=1;
 541                         /* s->server=0; */
 542                         s->handshake_func=ssl3_connect;
 543                         s->ctx->stats.sess_connect_good++;
 544
 545                         if (cb != NULL) cb(s,SSL_CB_HANDSHAKE_DONE,1);
 546
 547                         goto end;
 548                         /* break; */
 549
 550                 default:
 551                         SSLerr(SSL_F_SSL3_CONNECT,SSL_R_UNKNOWN_STATE);
 552                         ret= -1;
 553                         goto end;
 554                         /* break; */
 555                         }
 556
 557                 /* did we do anything */
 558                 if (!s->s3->tmp.reuse_message && !skip)
 559                         {
 560                         if (s->debug)
 561                                 {
 562                                 if ((ret=BIO_flush(s->wbio)) <= 0)
 563                                         goto end;
 564                                 }
 565
 566                         if ((cb != NULL) && (s->state != state))
 567                                 {
 568                                 new_state=s->state;
 569                                 s->state=state;
 570                                 cb(s,SSL_CB_CONNECT_LOOP,1);
 571                                 s->state=new_state;
 572                                 }
 573                         }
 574                 skip=0;
 575                 }
 576 end:
 577         s->in_handshake--;
 578         if (buf != NULL)
 579                 BUF_MEM_free(buf);
 580         if (cb != NULL)
 581                 cb(s,SSL_CB_CONNECT_EXIT,ret);
 582         return(ret);
 583         }
 584
 585
 586 int ssl3_client_hello(SSL *s)
 587         {
 588         unsigned char *buf;
 589         unsigned char *p,*d;
 590         int i;
 591         unsigned long Time,l;
 592 #ifndef OPENSSL_NO_COMP
 593         int j;
 594         SSL_COMP *comp;
 595 #endif
 596
 597         buf=(unsigned char *)s->init_buf->data;
 598         if (s->state == SSL3_ST_CW_CLNT_HELLO_A)
 599                 {
 600                 SSL_SESSION *sess = s->session;
 601                 if ((sess == NULL) ||
 602                         (sess->ssl_version != s->version) ||
 603 #ifdef OPENSSL_NO_TLSEXT
 604                         !sess->session_id_length ||
 605 #else
 606                         (!sess->session_id_length && !sess->tlsext_tick) ||
 607 #endif
 608                         (sess->not_resumable))
 609                         {
 610                         if (!ssl_get_new_session(s,0))
 611                                 goto err;
 612                         }
 613                 /* else use the pre-loaded session */
 614
 615                 p=s->s3->client_random;
 616                 Time=(unsigned long)time(NULL);                 /* Time */
 617                 l2n(Time,p);
 618                 if (RAND_pseudo_bytes(p,SSL3_RANDOM_SIZE-4) <= 0)
 619                         goto err;
 620
 621                 /* Do the message type and length last */
 622                 d=p= &(buf[4]);
 623
 624                 *(p++)=s->version>>8;
 625                 *(p++)=s->version&0xff;
 626                 s->client_version=s->version;
 627
 628                 /* Random stuff */
 629                 memcpy(p,s->s3->client_random,SSL3_RANDOM_SIZE);
 630                 p+=SSL3_RANDOM_SIZE;
 631
 632                 /* Session ID */
 633                 if (s->new_session)
 634                         i=0;
 635                 else
 636                         i=s->session->session_id_length;
 637                 *(p++)=i;
 638                 if (i != 0)
 639                         {
 640                         if (i > (int)sizeof(s->session->session_id))
 641                                 {
 642                                 SSLerr(SSL_F_SSL3_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
 643                                 goto err;
 644                                 }
 645                         memcpy(p,s->session->session_id,i);
 646                         p+=i;
 647                         }
 648
 649                 /* Ciphers supported */
 650                 i=ssl_cipher_list_to_bytes(s,SSL_get_ciphers(s),&(p[2]),0);
 651                 if (i == 0)
 652                         {
 653                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,SSL_R_NO_CIPHERS_AVAILABLE);
 654                         goto err;
 655                         }
 656                 s2n(i,p);
 657                 p+=i;
 658
 659                 /* COMPRESSION */
 660 #ifdef OPENSSL_NO_COMP
 661                 *(p++)=1;
 662 #else
 663                 if (s->ctx->comp_methods == NULL)
 664                         j=0;
 665                 else
 666                         j=sk_SSL_COMP_num(s->ctx->comp_methods);
 667                 *(p++)=1+j;
 668                 for (i=0; i<j; i++)
 669                         {
 670                         comp=sk_SSL_COMP_value(s->ctx->comp_methods,i);
 671                         *(p++)=comp->id;
 672                         }
 673 #endif
 674                 *(p++)=0; /* Add the NULL method */
 675 #ifndef OPENSSL_NO_TLSEXT
 676                 if ((p = ssl_add_clienthello_tlsext(s, p, buf+SSL3_RT_MAX_PLAIN_LENGTH)) == NULL)
 677                         {
 678                         SSLerr(SSL_F_SSL3_CLIENT_HELLO,ERR_R_INTERNAL_ERROR);
 679                         goto err;
 680                         }
 681 #endif
 682                 l=(p-d);
 683                 d=buf;
 684                 *(d++)=SSL3_MT_CLIENT_HELLO;
 685                 l2n3(l,d);
 686
 687                 s->state=SSL3_ST_CW_CLNT_HELLO_B;
 688                 /* number of bytes to write */
 689                 s->init_num=p-buf;
 690                 s->init_off=0;
 691                 }
 692
 693         /* SSL3_ST_CW_CLNT_HELLO_B */
 694         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
 695 err:
 696         return(-1);
 697         }
 698
 699 int ssl3_get_server_hello(SSL *s)
 700         {
 701         STACK_OF(SSL_CIPHER) *sk;
 702         SSL_CIPHER *c;
 703         unsigned char *p,*d;
 704         int i,al,ok;
 705         unsigned int j;
 706         long n;
 707 #ifndef OPENSSL_NO_COMP
 708         SSL_COMP *comp;
 709 #endif
 710
 711         n=s->method->ssl_get_message(s,
 712                 SSL3_ST_CR_SRVR_HELLO_A,
 713                 SSL3_ST_CR_SRVR_HELLO_B,
 714                 -1,
 715                 20000, /* ?? */
 716                 &ok);
 717
 718         if (!ok) return((int)n);
 719
 720         if ( SSL_version(s) == DTLS1_VERSION || SSL_version(s) == DTLS1_BAD_VER)
 721                 {
 722                 if ( s->s3->tmp.message_type == DTLS1_MT_HELLO_VERIFY_REQUEST)
 723                         {
 724                         if ( s->d1->send_cookie == 0)
 725                                 {
 726                                 s->s3->tmp.reuse_message = 1;
 727                                 return 1;
 728                                 }
 729                         else /* already sent a cookie */
 730                                 {
 731                                 al=SSL_AD_UNEXPECTED_MESSAGE;
 732                                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 733                                 goto f_err;
 734                                 }
 735                         }
 736                 }
 737
 738         if ( s->s3->tmp.message_type != SSL3_MT_SERVER_HELLO)
 739                 {
 740                 al=SSL_AD_UNEXPECTED_MESSAGE;
 741                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_MESSAGE_TYPE);
 742                 goto f_err;
 743                 }
 744
 745         d=p=(unsigned char *)s->init_msg;
 746
 747         if ((p[0] != (s->version>>8)) || (p[1] != (s->version&0xff)))
 748                 {
 749                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_SSL_VERSION);
 750                 s->version=(s->version&0xff00)|p[1];
 751                 al=SSL_AD_PROTOCOL_VERSION;
 752                 goto f_err;
 753                 }
 754         p+=2;
 755
 756         /* load the server hello data */
 757         /* load the server random */
 758         memcpy(s->s3->server_random,p,SSL3_RANDOM_SIZE);
 759         p+=SSL3_RANDOM_SIZE;
 760
 761         /* get the session-id */
 762         j= *(p++);
 763
 764         if ((j > sizeof s->session->session_id) || (j > SSL3_SESSION_ID_SIZE))
 765                 {
 766                 al=SSL_AD_ILLEGAL_PARAMETER;
 767                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SSL3_SESSION_ID_TOO_LONG);
 768                 goto f_err;
 769                 }
 770
 771         if (j != 0 && j == s->session->session_id_length
 772             && memcmp(p,s->session->session_id,j) == 0)
 773             {
 774             if(s->sid_ctx_length != s->session->sid_ctx_length
 775                || memcmp(s->session->sid_ctx,s->sid_ctx,s->sid_ctx_length))
 776                 {
 777                 /* actually a client application bug */
 778                 al=SSL_AD_ILLEGAL_PARAMETER;
 779                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
 780                 goto f_err;
 781                 }
 782             s->s3->flags |= SSL3_FLAGS_CCS_OK;
 783             s->hit=1;
 784             }
 785         else    /* a miss or crap from the other end */
 786                 {
 787                 /* If we were trying for session-id reuse, make a new
 788                  * SSL_SESSION so we don't stuff up other people */
 789                 s->hit=0;
 790                 if (s->session->session_id_length > 0)
 791                         {
 792                         if (!ssl_get_new_session(s,0))
 793                                 {
 794                                 al=SSL_AD_INTERNAL_ERROR;
 795                                 goto f_err;
 796                                 }
 797                         }
 798                 s->session->session_id_length=j;
 799                 memcpy(s->session->session_id,p,j); /* j could be 0 */
 800                 }
 801         p+=j;
 802         c=ssl_get_cipher_by_char(s,p);
 803         if (c == NULL)
 804                 {
 805                 /* unknown cipher */
 806                 al=SSL_AD_ILLEGAL_PARAMETER;
 807                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNKNOWN_CIPHER_RETURNED);
 808                 goto f_err;
 809                 }
 810         p+=ssl_put_cipher_by_char(s,NULL,NULL);
 811
 812         sk=ssl_get_ciphers_by_id(s);
 813         i=sk_SSL_CIPHER_find(sk,c);
 814         if (i < 0)
 815                 {
 816                 /* we did not say we would use this cipher */
 817                 al=SSL_AD_ILLEGAL_PARAMETER;
 818                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_WRONG_CIPHER_RETURNED);
 819                 goto f_err;
 820                 }
 821
 822         /* Depending on the session caching (internal/external), the cipher
 823            and/or cipher_id values may not be set. Make sure that
 824            cipher_id is set and use it for comparison. */
 825         if (s->session->cipher)
 826                 s->session->cipher_id = s->session->cipher->id;
 827         if (s->hit && (s->session->cipher_id != c->id))
 828                 {
 829 /* Workaround is now obsolete */
 830 #if 0
 831                 if (!(s->options &
 832                         SSL_OP_NETSCAPE_REUSE_CIPHER_CHANGE_BUG))
 833 #endif
 834                         {
 835                         al=SSL_AD_ILLEGAL_PARAMETER;
 836                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
 837                         goto f_err;
 838                         }
 839                 }
 840         s->s3->tmp.new_cipher=c;
 841
 842         /* lets get the compression algorithm */
 843         /* COMPRESSION */
 844 #ifdef OPENSSL_NO_COMP
 845         if (*(p++) != 0)
 846                 {
 847                 al=SSL_AD_ILLEGAL_PARAMETER;
 848                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 849                 goto f_err;
 850                 }
 851 #else
 852         j= *(p++);
 853         if (j == 0)
 854                 comp=NULL;
 855         else
 856                 comp=ssl3_comp_find(s->ctx->comp_methods,j);
 857
 858         if ((j != 0) && (comp == NULL))
 859                 {
 860                 al=SSL_AD_ILLEGAL_PARAMETER;
 861                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
 862                 goto f_err;
 863                 }
 864         else
 865                 {
 866                 s->s3->tmp.new_compression=comp;
 867                 }
 868 #endif
 869 #ifndef OPENSSL_NO_TLSEXT
 870         /* TLS extensions*/
 871         if (s->version >= SSL3_VERSION)
 872                 {
 873                 if (!ssl_parse_serverhello_tlsext(s,&p,d,n, &al))
 874                         {
 875                         /* 'al' set by ssl_parse_serverhello_tlsext */
 876                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_PARSE_TLSEXT);
 877                         goto f_err;
 878                         }
 879                 if (ssl_check_serverhello_tlsext(s) <= 0)
 880                         {
 881                         SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_SERVERHELLO_TLSEXT);
 882                                 goto err;
 883                         }
 884                 }
 885 #endif
 886
 887
 888         if (p != (d+n))
 889                 {
 890                 /* wrong packet length */
 891                 al=SSL_AD_DECODE_ERROR;
 892                 SSLerr(SSL_F_SSL3_GET_SERVER_HELLO,SSL_R_BAD_PACKET_LENGTH);
 893                 goto f_err;
 894                 }
 895
 896         return(1);
 897 f_err:
 898         ssl3_send_alert(s,SSL3_AL_FATAL,al);
 899 #ifndef OPENSSL_NO_TLSEXT
 900 err:
 901 #endif
 902         return(-1);
 903         }
 904
 905 int ssl3_get_server_certificate(SSL *s)
 906         {
 907         int al,i,ok,ret= -1;
 908         unsigned long n,nc,llen,l;
 909         X509 *x=NULL;
 910         const unsigned char *q,*p;
 911         unsigned char *d;
 912         STACK_OF(X509) *sk=NULL;
 913         SESS_CERT *sc;
 914         EVP_PKEY *pkey=NULL;
 915         int need_cert = 1; /* VRS: 0=> will allow null cert if auth == KRB5 */
 916
 917         n=s->method->ssl_get_message(s,
 918                 SSL3_ST_CR_CERT_A,
 919                 SSL3_ST_CR_CERT_B,
 920                 -1,
 921                 s->max_cert_list,
 922                 &ok);
 923
 924         if (!ok) return((int)n);
 925
 926         if ((s->s3->tmp.message_type == SSL3_MT_SERVER_KEY_EXCHANGE) ||
 927                 ((s->s3->tmp.new_cipher->algorithms & SSL_aKRB5) &&
 928                 (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)))
 929                 {
 930                 s->s3->tmp.reuse_message=1;
 931                 return(1);
 932                 }
 933
 934         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE)
 935                 {
 936                 al=SSL_AD_UNEXPECTED_MESSAGE;
 937                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_BAD_MESSAGE_TYPE);
 938                 goto f_err;
 939                 }
 940         p=d=(unsigned char *)s->init_msg;
 941
 942         if ((sk=sk_X509_new_null()) == NULL)
 943                 {
 944                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 945                 goto err;
 946                 }
 947
 948         n2l3(p,llen);
 949         if (llen+3 != n)
 950                 {
 951                 al=SSL_AD_DECODE_ERROR;
 952                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_LENGTH_MISMATCH);
 953                 goto f_err;
 954                 }
 955         for (nc=0; nc<llen; )
 956                 {
 957                 n2l3(p,l);
 958                 if ((l+nc+3) > llen)
 959                         {
 960                         al=SSL_AD_DECODE_ERROR;
 961                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 962                         goto f_err;
 963                         }
 964
 965                 q=p;
 966                 x=d2i_X509(NULL,&q,l);
 967                 if (x == NULL)
 968                         {
 969                         al=SSL_AD_BAD_CERTIFICATE;
 970                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_ASN1_LIB);
 971                         goto f_err;
 972                         }
 973                 if (q != (p+l))
 974                         {
 975                         al=SSL_AD_DECODE_ERROR;
 976                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERT_LENGTH_MISMATCH);
 977                         goto f_err;
 978                         }
 979                 if (!sk_X509_push(sk,x))
 980                         {
 981                         SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,ERR_R_MALLOC_FAILURE);
 982                         goto err;
 983                         }
 984                 x=NULL;
 985                 nc+=l+3;
 986                 p=q;
 987                 }
 988
 989         i=ssl_verify_cert_chain(s,sk);
 990         if ((s->verify_mode != SSL_VERIFY_NONE) && (i <= 0)
 991 #ifndef OPENSSL_NO_KRB5
 992                 && (s->s3->tmp.new_cipher->algorithms & (SSL_MKEY_MASK|SSL_AUTH_MASK))
 993                 != (SSL_aKRB5|SSL_kKRB5)
 994 #endif /* OPENSSL_NO_KRB5 */
 995                 )
 996                 {
 997                 al=ssl_verify_alarm_type(s->verify_result);
 998                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,SSL_R_CERTIFICATE_VERIFY_FAILED);
 999                 goto f_err;
1000                 }
1001         ERR_clear_error(); /* but we keep s->verify_result */
1002
1003         sc=ssl_sess_cert_new();
1004         if (sc == NULL) goto err;
1005
1006         if (s->session->sess_cert) ssl_sess_cert_free(s->session->sess_cert);
1007         s->session->sess_cert=sc;
1008
1009         sc->cert_chain=sk;
1010         /* Inconsistency alert: cert_chain does include the peer's
1011          * certificate, which we don't include in s3_srvr.c */
1012         x=sk_X509_value(sk,0);
1013         sk=NULL;
1014         /* VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end*/
1015
1016         pkey=X509_get_pubkey(x);
1017
1018         /* VRS: allow null cert if auth == KRB5 */
1019         need_cert =     ((s->s3->tmp.new_cipher->algorithms
1020                          & (SSL_MKEY_MASK|SSL_AUTH_MASK))
1021                          == (SSL_aKRB5|SSL_kKRB5))? 0: 1;
1022
1023 #ifdef KSSL_DEBUG
1024         printf("pkey,x = %p, %p\n", (void *)pkey,(void *)x);
1025         printf("ssl_cert_type(x,pkey) = %d\n", ssl_cert_type(x,pkey));
1026         printf("cipher, alg, nc = %s, %lx, %d\n", s->s3->tmp.new_cipher->name,
1027                 s->s3->tmp.new_cipher->algorithms, need_cert);
1028 #endif    /* KSSL_DEBUG */
1029
1030         if (need_cert && ((pkey == NULL) || EVP_PKEY_missing_parameters(pkey)))
1031                 {
1032                 x=NULL;
1033                 al=SSL3_AL_FATAL;
1034                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1035                         SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
1036                 goto f_err;
1037                 }
1038
1039         i=ssl_cert_type(x,pkey);
1040         if (need_cert && i < 0)
1041                 {
1042                 x=NULL;
1043                 al=SSL3_AL_FATAL;
1044                 SSLerr(SSL_F_SSL3_GET_SERVER_CERTIFICATE,
1045                         SSL_R_UNKNOWN_CERTIFICATE_TYPE);
1046                 goto f_err;
1047                 }
1048
1049         if (need_cert)
1050                 {
1051                 sc->peer_cert_type=i;
1052                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1053                 /* Why would the following ever happen?
1054                  * We just created sc a couple of lines ago. */
1055                 if (sc->peer_pkeys[i].x509 != NULL)
1056                         X509_free(sc->peer_pkeys[i].x509);
1057                 sc->peer_pkeys[i].x509=x;
1058                 sc->peer_key= &(sc->peer_pkeys[i]);
1059
1060                 if (s->session->peer != NULL)
1061                         X509_free(s->session->peer);
1062                 CRYPTO_add(&x->references,1,CRYPTO_LOCK_X509);
1063                 s->session->peer=x;
1064                 }
1065         else
1066                 {
1067                 sc->peer_cert_type=i;
1068                 sc->peer_key= NULL;
1069
1070                 if (s->session->peer != NULL)
1071                         X509_free(s->session->peer);
1072                 s->session->peer=NULL;
1073                 }
1074         s->session->verify_result = s->verify_result;
1075
1076         x=NULL;
1077         ret=1;
1078
1079         if (0)
1080                 {
1081 f_err:
1082                 ssl3_send_alert(s,SSL3_AL_FATAL,al);
1083                 }
1084 err:
1085         EVP_PKEY_free(pkey);
1086         X509_free(x);
1087         sk_X509_pop_free(sk,X509_free);
1088         return(ret);
1089         }
1090
1091 int ssl3_get_key_exchange(SSL *s)
1092         {
1093 #ifndef OPENSSL_NO_RSA
1094         unsigned char *q,md_buf[EVP_MAX_MD_SIZE*2];
1095 #endif
1096         EVP_MD_CTX md_ctx;
1097         unsigned char *param,*p;
1098         int al,i,j,param_len,ok;
1099         long n,alg;
1100         EVP_PKEY *pkey=NULL;
1101 #ifndef OPENSSL_NO_RSA
1102         RSA *rsa=NULL;
1103 #endif
1104 #ifndef OPENSSL_NO_DH
1105         DH *dh=NULL;
1106 #endif
1107 #ifndef OPENSSL_NO_ECDH
1108         EC_KEY *ecdh = NULL;
1109         BN_CTX *bn_ctx = NULL;
1110         EC_POINT *srvr_ecpoint = NULL;
1111         int curve_nid = 0;
1112         int encoded_pt_len = 0;
1113 #endif
1114
1115         /* use same message size as in ssl3_get_certificate_request()
1116          * as ServerKeyExchange message may be skipped */
1117         n=s->method->ssl_get_message(s,
1118                 SSL3_ST_CR_KEY_EXCH_A,
1119                 SSL3_ST_CR_KEY_EXCH_B,
1120                 -1,
1121                 s->max_cert_list,
1122                 &ok);
1123
1124         if (!ok) return((int)n);
1125
1126         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1127                 {
1128                 s->s3->tmp.reuse_message=1;
1129                 return(1);
1130                 }
1131
1132         param=p=(unsigned char *)s->init_msg;
1133
1134         if (s->session->sess_cert != NULL)
1135                 {
1136 #ifndef OPENSSL_NO_RSA
1137                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1138                         {
1139                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1140                         s->session->sess_cert->peer_rsa_tmp=NULL;
1141                         }
1142 #endif
1143 #ifndef OPENSSL_NO_DH
1144                 if (s->session->sess_cert->peer_dh_tmp)
1145                         {
1146                         DH_free(s->session->sess_cert->peer_dh_tmp);
1147                         s->session->sess_cert->peer_dh_tmp=NULL;
1148                         }
1149 #endif
1150 #ifndef OPENSSL_NO_ECDH
1151                 if (s->session->sess_cert->peer_ecdh_tmp)
1152                         {
1153                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1154                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1155                         }
1156 #endif
1157                 }
1158         else
1159                 {
1160                 s->session->sess_cert=ssl_sess_cert_new();
1161                 }
1162
1163         param_len=0;
1164         alg=s->s3->tmp.new_cipher->algorithms;
1165         EVP_MD_CTX_init(&md_ctx);
1166
1167 #ifndef OPENSSL_NO_RSA
1168         if (alg & SSL_kRSA)
1169                 {
1170                 if ((rsa=RSA_new()) == NULL)
1171                         {
1172                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1173                         goto err;
1174                         }
1175                 n2s(p,i);
1176                 param_len=i+2;
1177                 if (param_len > n)
1178                         {
1179                         al=SSL_AD_DECODE_ERROR;
1180                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1181                         goto f_err;
1182                         }
1183                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1184                         {
1185                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1186                         goto err;
1187                         }
1188                 p+=i;
1189
1190                 n2s(p,i);
1191                 param_len+=i+2;
1192                 if (param_len > n)
1193                         {
1194                         al=SSL_AD_DECODE_ERROR;
1195                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1196                         goto f_err;
1197                         }
1198                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1199                         {
1200                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1201                         goto err;
1202                         }
1203                 p+=i;
1204                 n-=param_len;
1205
1206                 /* this should be because we are using an export cipher */
1207                 if (alg & SSL_aRSA)
1208                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1209                 else
1210                         {
1211                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1212                         goto err;
1213                         }
1214                 s->session->sess_cert->peer_rsa_tmp=rsa;
1215                 rsa=NULL;
1216                 }
1217 #else /* OPENSSL_NO_RSA */
1218         if (0)
1219                 ;
1220 #endif
1221 #ifndef OPENSSL_NO_DH
1222         else if (alg & SSL_kEDH)
1223                 {
1224                 if ((dh=DH_new()) == NULL)
1225                         {
1226                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1227                         goto err;
1228                         }
1229                 n2s(p,i);
1230                 param_len=i+2;
1231                 if (param_len > n)
1232                         {
1233                         al=SSL_AD_DECODE_ERROR;
1234                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1235                         goto f_err;
1236                         }
1237                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1238                         {
1239                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1240                         goto err;
1241                         }
1242                 p+=i;
1243
1244                 n2s(p,i);
1245                 param_len+=i+2;
1246                 if (param_len > n)
1247                         {
1248                         al=SSL_AD_DECODE_ERROR;
1249                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1250                         goto f_err;
1251                         }
1252                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1253                         {
1254                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1255                         goto err;
1256                         }
1257                 p+=i;
1258
1259                 n2s(p,i);
1260                 param_len+=i+2;
1261                 if (param_len > n)
1262                         {
1263                         al=SSL_AD_DECODE_ERROR;
1264                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1265                         goto f_err;
1266                         }
1267                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1268                         {
1269                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1270                         goto err;
1271                         }
1272                 p+=i;
1273                 n-=param_len;
1274
1275 #ifndef OPENSSL_NO_RSA
1276                 if (alg & SSL_aRSA)
1277                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1278 #else
1279                 if (0)
1280                         ;
1281 #endif
1282 #ifndef OPENSSL_NO_DSA
1283                 else if (alg & SSL_aDSS)
1284                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1285 #endif
1286                 /* else anonymous DH, so no certificate or pkey. */
1287
1288                 s->session->sess_cert->peer_dh_tmp=dh;
1289                 dh=NULL;
1290                 }
1291         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1292                 {
1293                 al=SSL_AD_ILLEGAL_PARAMETER;
1294                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1295                 goto f_err;
1296                 }
1297 #endif /* !OPENSSL_NO_DH */
1298
1299 #ifndef OPENSSL_NO_ECDH
1300         else if (alg & SSL_kECDHE)
1301                 {
1302                 EC_GROUP *ngroup;
1303                 const EC_GROUP *group;
1304
1305                 if ((ecdh=EC_KEY_new()) == NULL)
1306                         {
1307                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1308                         goto err;
1309                         }
1310
1311                 /* Extract elliptic curve parameters and the
1312                  * server's ephemeral ECDH public key.
1313                  * Keep accumulating lengths of various components in
1314                  * param_len and make sure it never exceeds n.
1315                  */
1316
1317                 /* XXX: For now we only support named (not generic) curves
1318                  * and the ECParameters in this case is just three bytes.
1319                  */
1320                 param_len=3;
1321                 if ((param_len > n) ||
1322                     (*p != NAMED_CURVE_TYPE) ||
1323                     ((curve_nid = curve_id2nid(*(p + 2))) == 0))
1324                         {
1325                         al=SSL_AD_INTERNAL_ERROR;
1326                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1327                         goto f_err;
1328                         }
1329
1330                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1331                 if (ngroup == NULL)
1332                         {
1333                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1334                         goto err;
1335                         }
1336                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1337                         {
1338                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1339                         goto err;
1340                         }
1341                 EC_GROUP_free(ngroup);
1342
1343                 group = EC_KEY_get0_group(ecdh);
1344
1345                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1346                     (EC_GROUP_get_degree(group) > 163))
1347                         {
1348                         al=SSL_AD_EXPORT_RESTRICTION;
1349                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1350                         goto f_err;
1351                         }
1352
1353                 p+=3;
1354
1355                 /* Next, get the encoded ECPoint */
1356                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1357                     ((bn_ctx = BN_CTX_new()) == NULL))
1358                         {
1359                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1360                         goto err;
1361                         }
1362
1363                 encoded_pt_len = *p;  /* length of encoded point */
1364                 p+=1;
1365                 param_len += (1 + encoded_pt_len);
1366                 if ((param_len > n) ||
1367                     (EC_POINT_oct2point(group, srvr_ecpoint,
1368                         p, encoded_pt_len, bn_ctx) == 0))
1369                         {
1370                         al=SSL_AD_DECODE_ERROR;
1371                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1372                         goto f_err;
1373                         }
1374
1375                 n-=param_len;
1376                 p+=encoded_pt_len;
1377
1378                 /* The ECC/TLS specification does not mention
1379                  * the use of DSA to sign ECParameters in the server
1380                  * key exchange message. We do support RSA and ECDSA.
1381                  */
1382                 if (0) ;
1383 #ifndef OPENSSL_NO_RSA
1384                 else if (alg & SSL_aRSA)
1385                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1386 #endif
1387 #ifndef OPENSSL_NO_ECDSA
1388                 else if (alg & SSL_aECDSA)
1389                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1390 #endif
1391                 /* else anonymous ECDH, so no certificate or pkey. */
1392                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1393                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1394                 ecdh=NULL;
1395                 BN_CTX_free(bn_ctx);
1396                 bn_ctx = NULL;
1397                 EC_POINT_free(srvr_ecpoint);
1398                 srvr_ecpoint = NULL;
1399                 }
1400         else if (alg & SSL_kECDH)
1401                 {
1402                 al=SSL_AD_UNEXPECTED_MESSAGE;
1403                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1404                 goto f_err;
1405                 }
1406 #endif /* !OPENSSL_NO_ECDH */
1407         if (alg & SSL_aFZA)
1408                 {
1409                 al=SSL_AD_HANDSHAKE_FAILURE;
1410                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1411                 goto f_err;
1412                 }
1413
1414
1415         /* p points to the next byte, there are 'n' bytes left */
1416
1417         /* if it was signed, check the signature */
1418         if (pkey != NULL)
1419                 {
1420                 n2s(p,i);
1421                 n-=2;
1422                 j=EVP_PKEY_size(pkey);
1423
1424                 if ((i != n) || (n > j) || (n <= 0))
1425                         {
1426                         /* wrong packet length */
1427                         al=SSL_AD_DECODE_ERROR;
1428                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1429                         goto f_err;
1430                         }
1431
1432 #ifndef OPENSSL_NO_RSA
1433                 if (pkey->type == EVP_PKEY_RSA)
1434                         {
1435                         int num;
1436
1437                         j=0;
1438                         q=md_buf;
1439                         for (num=2; num > 0; num--)
1440                                 {
1441                                 EVP_MD_CTX_set_flags(&md_ctx,
1442                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1443                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1444                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1445                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1446                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1447                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1448                                 EVP_DigestFinal_ex(&md_ctx,q,(unsigned int *)&i);
1449                                 q+=i;
1450                                 j+=i;
1451                                 }
1452                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1453                                                                 pkey->pkey.rsa);
1454                         if (i < 0)
1455                                 {
1456                                 al=SSL_AD_DECRYPT_ERROR;
1457                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1458                                 goto f_err;
1459                                 }
1460                         if (i == 0)
1461                                 {
1462                                 /* bad signature */
1463                                 al=SSL_AD_DECRYPT_ERROR;
1464                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1465                                 goto f_err;
1466                                 }
1467                         }
1468                 else
1469 #endif
1470 #ifndef OPENSSL_NO_DSA
1471                         if (pkey->type == EVP_PKEY_DSA)
1472                         {
1473                         /* lets do DSS */
1474                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1475                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1476                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1477                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1478                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1479                                 {
1480                                 /* bad signature */
1481                                 al=SSL_AD_DECRYPT_ERROR;
1482                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1483                                 goto f_err;
1484                                 }
1485                         }
1486                 else
1487 #endif
1488 #ifndef OPENSSL_NO_ECDSA
1489                         if (pkey->type == EVP_PKEY_EC)
1490                         {
1491                         /* let's do ECDSA */
1492                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1493                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1494                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1495                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1496                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1497                                 {
1498                                 /* bad signature */
1499                                 al=SSL_AD_DECRYPT_ERROR;
1500                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1501                                 goto f_err;
1502                                 }
1503                         }
1504                 else
1505 #endif
1506                         {
1507                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1508                         goto err;
1509                         }
1510                 }
1511         else
1512                 {
1513                 /* still data left over */
1514                 if (!(alg & SSL_aNULL))
1515                         {
1516                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1517                         goto err;
1518                         }
1519                 if (n != 0)
1520                         {
1521                         al=SSL_AD_DECODE_ERROR;
1522                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1523                         goto f_err;
1524                         }
1525                 }
1526         EVP_PKEY_free(pkey);
1527         EVP_MD_CTX_cleanup(&md_ctx);
1528         return(1);
1529 f_err:
1530         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1531 err:
1532         EVP_PKEY_free(pkey);
1533 #ifndef OPENSSL_NO_RSA
1534         if (rsa != NULL)
1535                 RSA_free(rsa);
1536 #endif
1537 #ifndef OPENSSL_NO_DH
1538         if (dh != NULL)
1539                 DH_free(dh);
1540 #endif
1541 #ifndef OPENSSL_NO_ECDH
1542         BN_CTX_free(bn_ctx);
1543         EC_POINT_free(srvr_ecpoint);
1544         if (ecdh != NULL)
1545                 EC_KEY_free(ecdh);
1546 #endif
1547         EVP_MD_CTX_cleanup(&md_ctx);
1548         return(-1);
1549         }
1550
1551 int ssl3_get_certificate_request(SSL *s)
1552         {
1553         int ok,ret=0;
1554         unsigned long n,nc,l;
1555         unsigned int llen,ctype_num,i;
1556         X509_NAME *xn=NULL;
1557         const unsigned char *p,*q;
1558         unsigned char *d;
1559         STACK_OF(X509_NAME) *ca_sk=NULL;
1560
1561         n=s->method->ssl_get_message(s,
1562                 SSL3_ST_CR_CERT_REQ_A,
1563                 SSL3_ST_CR_CERT_REQ_B,
1564                 -1,
1565                 s->max_cert_list,
1566                 &ok);
1567
1568         if (!ok) return((int)n);
1569
1570         s->s3->tmp.cert_req=0;
1571
1572         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1573                 {
1574                 s->s3->tmp.reuse_message=1;
1575                 return(1);
1576                 }
1577
1578         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1579                 {
1580                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1581                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1582                 goto err;
1583                 }
1584
1585         /* TLS does not like anon-DH with client cert */
1586         if (s->version > SSL3_VERSION)
1587                 {
1588                 l=s->s3->tmp.new_cipher->algorithms;
1589                 if (l & SSL_aNULL)
1590                         {
1591                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1592                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1593                         goto err;
1594                         }
1595                 }
1596
1597         p=d=(unsigned char *)s->init_msg;
1598
1599         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1600                 {
1601                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1602                 goto err;
1603                 }
1604
1605         /* get the certificate types */
1606         ctype_num= *(p++);
1607         if (ctype_num > SSL3_CT_NUMBER)
1608                 ctype_num=SSL3_CT_NUMBER;
1609         for (i=0; i<ctype_num; i++)
1610                 s->s3->tmp.ctype[i]= p[i];
1611         p+=ctype_num;
1612
1613         /* get the CA RDNs */
1614         n2s(p,llen);
1615 #if 0
1616 {
1617 FILE *out;
1618 out=fopen("/tmp/vsign.der","w");
1619 fwrite(p,1,llen,out);
1620 fclose(out);
1621 }
1622 #endif
1623
1624         if ((llen+ctype_num+2+1) != n)
1625                 {
1626                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1627                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1628                 goto err;
1629                 }
1630
1631         for (nc=0; nc<llen; )
1632                 {
1633                 n2s(p,l);
1634                 if ((l+nc+2) > llen)
1635                         {
1636                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1637                                 goto cont; /* netscape bugs */
1638                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1639                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1640                         goto err;
1641                         }
1642
1643                 q=p;
1644
1645                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1646                         {
1647                         /* If netscape tolerance is on, ignore errors */
1648                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1649                                 goto cont;
1650                         else
1651                                 {
1652                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1653                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1654                                 goto err;
1655                                 }
1656                         }
1657
1658                 if (q != (p+l))
1659                         {
1660                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1661                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1662                         goto err;
1663                         }
1664                 if (!sk_X509_NAME_push(ca_sk,xn))
1665                         {
1666                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1667                         goto err;
1668                         }
1669
1670                 p+=l;
1671                 nc+=l+2;
1672                 }
1673
1674         if (0)
1675                 {
1676 cont:
1677                 ERR_clear_error();
1678                 }
1679
1680         /* we should setup a certificate to return.... */
1681         s->s3->tmp.cert_req=1;
1682         s->s3->tmp.ctype_num=ctype_num;
1683         if (s->s3->tmp.ca_names != NULL)
1684                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1685         s->s3->tmp.ca_names=ca_sk;
1686         ca_sk=NULL;
1687
1688         ret=1;
1689 err:
1690         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1691         return(ret);
1692         }
1693
1694 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1695         {
1696         return(X509_NAME_cmp(*a,*b));
1697         }
1698 #ifndef OPENSSL_NO_TLSEXT
1699 int ssl3_get_new_session_ticket(SSL *s)
1700         {
1701         int ok,al,ret=0, ticklen;
1702         long n;
1703         const unsigned char *p;
1704         unsigned char *d;
1705
1706         n=s->method->ssl_get_message(s,
1707                 SSL3_ST_CR_SESSION_TICKET_A,
1708                 SSL3_ST_CR_SESSION_TICKET_B,
1709                 -1,
1710                 16384,
1711                 &ok);
1712
1713         if (!ok)
1714                 return((int)n);
1715
1716         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
1717                 {
1718                 s->s3->tmp.reuse_message=1;
1719                 return(1);
1720                 }
1721         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
1722                 {
1723                 al=SSL_AD_UNEXPECTED_MESSAGE;
1724                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
1725                 goto f_err;
1726                 }
1727         if (n < 6)
1728                 {
1729                 /* need at least ticket_lifetime_hint + ticket length */
1730                 al = SSL_AD_DECODE_ERROR;
1731                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1732                 goto f_err;
1733                 }
1734
1735         p=d=(unsigned char *)s->init_msg;
1736         n2l(p, s->session->tlsext_tick_lifetime_hint);
1737         n2s(p, ticklen);
1738         /* ticket_lifetime_hint + ticket_length + ticket */
1739         if (ticklen + 6 != n)
1740                 {
1741                 al = SSL_AD_DECODE_ERROR;
1742                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1743                 goto f_err;
1744                 }
1745         if (s->session->tlsext_tick)
1746                 {
1747                 OPENSSL_free(s->session->tlsext_tick);
1748                 s->session->tlsext_ticklen = 0;
1749                 }
1750         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1751         if (!s->session->tlsext_tick)
1752                 {
1753                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
1754                 goto err;
1755                 }
1756         memcpy(s->session->tlsext_tick, p, ticklen);
1757         s->session->tlsext_ticklen = ticklen;
1758         /* There are two ways to detect a resumed ticket sesion.
1759          * One is to set an appropriate session ID and then the server
1760          * must return a match in ServerHello. This allows the normal
1761          * client session ID matching to work and we know much
1762          * earlier that the ticket has been accepted.
1763          *
1764          * The other way is to set zero length session ID when the
1765          * ticket is presented and rely on the handshake to determine
1766          * session resumption.
1767          *
1768          * We choose the former approach because this fits in with
1769          * assumptions elsewhere in OpenSSL. The session ID is set
1770          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
1771          * ticket.
1772          */
1773         EVP_Digest(p, ticklen,
1774                         s->session->session_id, &s->session->session_id_length,
1775 #ifndef OPENSSL_NO_SHA256
1776                                                         EVP_sha256(), NULL);
1777 #else
1778                                                         EVP_sha1(), NULL);
1779 #endif
1780         ret=1;
1781         return(ret);
1782 f_err:
1783         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1784 err:
1785         return(-1);
1786         }
1787
1788 int ssl3_get_cert_status(SSL *s)
1789         {
1790         int ok, al;
1791         unsigned long resplen;
1792         long n;
1793         const unsigned char *p;
1794
1795         n=s->method->ssl_get_message(s,
1796                 SSL3_ST_CR_CERT_STATUS_A,
1797                 SSL3_ST_CR_CERT_STATUS_B,
1798                 SSL3_MT_CERTIFICATE_STATUS,
1799                 16384,
1800                 &ok);
1801
1802         if (!ok) return((int)n);
1803         if (n < 4)
1804                 {
1805                 /* need at least status type + length */
1806                 al = SSL_AD_DECODE_ERROR;
1807                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1808                 goto f_err;
1809                 }
1810         p = (unsigned char *)s->init_msg;
1811         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
1812                 {
1813                 al = SSL_AD_DECODE_ERROR;
1814                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
1815                 goto f_err;
1816                 }
1817         n2l3(p, resplen);
1818         if (resplen + 4 != (unsigned long)n)
1819                 {
1820                 al = SSL_AD_DECODE_ERROR;
1821                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1822                 goto f_err;
1823                 }
1824         if (s->tlsext_ocsp_resp)
1825                 OPENSSL_free(s->tlsext_ocsp_resp);
1826         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
1827         if (!s->tlsext_ocsp_resp)
1828                 {
1829                 al = SSL_AD_INTERNAL_ERROR;
1830                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1831                 goto f_err;
1832                 }
1833         s->tlsext_ocsp_resplen = resplen;
1834         if (s->ctx->tlsext_status_cb)
1835                 {
1836                 int ret;
1837                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1838                 if (ret == 0)
1839                         {
1840                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1841                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
1842                         goto f_err;
1843                         }
1844                 if (ret < 0)
1845                         {
1846                         al = SSL_AD_INTERNAL_ERROR;
1847                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1848                         goto f_err;
1849                         }
1850                 }
1851         return 1;
1852 f_err:
1853         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1854         return(-1);
1855         }
1856 #endif
1857
1858 int ssl3_get_server_done(SSL *s)
1859         {
1860         int ok,ret=0;
1861         long n;
1862
1863         n=s->method->ssl_get_message(s,
1864                 SSL3_ST_CR_SRVR_DONE_A,
1865                 SSL3_ST_CR_SRVR_DONE_B,
1866                 SSL3_MT_SERVER_DONE,
1867                 30, /* should be very small, like 0 :-) */
1868                 &ok);
1869
1870         if (!ok) return((int)n);
1871         if (n > 0)
1872                 {
1873                 /* should contain no data */
1874                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1875                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1876                 return -1;
1877                 }
1878         ret=1;
1879         return(ret);
1880         }
1881
1882
1883 int ssl3_send_client_key_exchange(SSL *s)
1884         {
1885         unsigned char *p,*d;
1886         int n;
1887         unsigned long l;
1888 #ifndef OPENSSL_NO_RSA
1889         unsigned char *q;
1890         EVP_PKEY *pkey=NULL;
1891 #endif
1892 #ifndef OPENSSL_NO_KRB5
1893         KSSL_ERR kssl_err;
1894 #endif /* OPENSSL_NO_KRB5 */
1895 #ifndef OPENSSL_NO_ECDH
1896         EC_KEY *clnt_ecdh = NULL;
1897         const EC_POINT *srvr_ecpoint = NULL;
1898         EVP_PKEY *srvr_pub_pkey = NULL;
1899         unsigned char *encodedPoint = NULL;
1900         int encoded_pt_len = 0;
1901         BN_CTX * bn_ctx = NULL;
1902 #endif
1903
1904         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1905                 {
1906                 d=(unsigned char *)s->init_buf->data;
1907                 p= &(d[4]);
1908
1909                 l=s->s3->tmp.new_cipher->algorithms;
1910
1911                 /* Fool emacs indentation */
1912                 if (0) {}
1913 #ifndef OPENSSL_NO_RSA
1914                 else if (l & SSL_kRSA)
1915                         {
1916                         RSA *rsa;
1917                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1918
1919                         if (s->session->sess_cert == NULL)
1920                                 {
1921                                 /* We should always have a server certificate with SSL_kRSA. */
1922                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1923                                 goto err;
1924                                 }
1925
1926                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1927                                 rsa=s->session->sess_cert->peer_rsa_tmp;
1928                         else
1929                                 {
1930                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1931                                 if ((pkey == NULL) ||
1932                                         (pkey->type != EVP_PKEY_RSA) ||
1933                                         (pkey->pkey.rsa == NULL))
1934                                         {
1935                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1936                                         goto err;
1937                                         }
1938                                 rsa=pkey->pkey.rsa;
1939                                 EVP_PKEY_free(pkey);
1940                                 }
1941
1942                         tmp_buf[0]=s->client_version>>8;
1943                         tmp_buf[1]=s->client_version&0xff;
1944                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
1945                                         goto err;
1946
1947                         s->session->master_key_length=sizeof tmp_buf;
1948
1949                         q=p;
1950                         /* Fix buf for TLS and beyond */
1951                         if (s->version > SSL3_VERSION)
1952                                 p+=2;
1953                         n=RSA_public_encrypt(sizeof tmp_buf,
1954                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
1955 #ifdef PKCS1_CHECK
1956                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
1957                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
1958 #endif
1959                         if (n <= 0)
1960                                 {
1961                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
1962                                 goto err;
1963                                 }
1964
1965                         /* Fix buf for TLS and beyond */
1966                         if (s->version > SSL3_VERSION)
1967                                 {
1968                                 s2n(n,q);
1969                                 n+=2;
1970                                 }
1971
1972                         s->session->master_key_length=
1973                                 s->method->ssl3_enc->generate_master_secret(s,
1974                                         s->session->master_key,
1975                                         tmp_buf,sizeof tmp_buf);
1976                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
1977                         }
1978 #endif
1979 #ifndef OPENSSL_NO_KRB5
1980                 else if (l & SSL_kKRB5)
1981                         {
1982                         krb5_error_code krb5rc;
1983                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
1984                         /*  krb5_data   krb5_ap_req;  */
1985                         krb5_data       *enc_ticket;
1986                         krb5_data       authenticator, *authp = NULL;
1987                         EVP_CIPHER_CTX  ciph_ctx;
1988                         EVP_CIPHER      *enc = NULL;
1989                         unsigned char   iv[EVP_MAX_IV_LENGTH];
1990                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1991                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
1992                                                 + EVP_MAX_IV_LENGTH];
1993                         int             padl, outl = sizeof(epms);
1994
1995                         EVP_CIPHER_CTX_init(&ciph_ctx);
1996
1997 #ifdef KSSL_DEBUG
1998                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
1999                                 l, SSL_kKRB5);
2000 #endif  /* KSSL_DEBUG */
2001
2002                         authp = NULL;
2003 #ifdef KRB5SENDAUTH
2004                         if (KRB5SENDAUTH)  authp = &authenticator;
2005 #endif  /* KRB5SENDAUTH */
2006
2007                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2008                                 &kssl_err);
2009                         enc = kssl_map_enc(kssl_ctx->enctype);
2010                         if (enc == NULL)
2011                             goto err;
2012 #ifdef KSSL_DEBUG
2013                         {
2014                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2015                         if (krb5rc && kssl_err.text)
2016                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2017                         }
2018 #endif  /* KSSL_DEBUG */
2019
2020                         if (krb5rc)
2021                                 {
2022                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2023                                                 SSL_AD_HANDSHAKE_FAILURE);
2024                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2025                                                 kssl_err.reason);
2026                                 goto err;
2027                                 }
2028
2029                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2030                         **  in place of RFC 2712 KerberosWrapper, as in:
2031                         **
2032                         **  Send ticket (copy to *p, set n = length)
2033                         **  n = krb5_ap_req.length;
2034                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2035                         **  if (krb5_ap_req.data)
2036                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2037                         **
2038                         **  Now using real RFC 2712 KerberosWrapper
2039                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2040                         **  Note: 2712 "opaque" types are here replaced
2041                         **  with a 2-byte length followed by the value.
2042                         **  Example:
2043                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2044                         **  Where "xx xx" = length bytes.  Shown here with
2045                         **  optional authenticator omitted.
2046                         */
2047
2048                         /*  KerberosWrapper.Ticket              */
2049                         s2n(enc_ticket->length,p);
2050                         memcpy(p, enc_ticket->data, enc_ticket->length);
2051                         p+= enc_ticket->length;
2052                         n = enc_ticket->length + 2;
2053
2054                         /*  KerberosWrapper.Authenticator       */
2055                         if (authp  &&  authp->length)
2056                                 {
2057                                 s2n(authp->length,p);
2058                                 memcpy(p, authp->data, authp->length);
2059                                 p+= authp->length;
2060                                 n+= authp->length + 2;
2061
2062                                 free(authp->data);
2063                                 authp->data = NULL;
2064                                 authp->length = 0;
2065                                 }
2066                         else
2067                                 {
2068                                 s2n(0,p);/*  null authenticator length  */
2069                                 n+=2;
2070                                 }
2071
2072                             tmp_buf[0]=s->client_version>>8;
2073                             tmp_buf[1]=s->client_version&0xff;
2074                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2075                                 goto err;
2076
2077                         /*  20010420 VRS.  Tried it this way; failed.
2078                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2079                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2080                         **                              kssl_ctx->length);
2081                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2082                         */
2083
2084                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2085                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2086                                 kssl_ctx->key,iv);
2087                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2088                                 sizeof tmp_buf);
2089                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2090                         outl += padl;
2091                         if (outl > sizeof epms)
2092                                 {
2093                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2094                                 goto err;
2095                                 }
2096                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2097
2098                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2099                         s2n(outl,p);
2100                         memcpy(p, epms, outl);
2101                         p+=outl;
2102                         n+=outl + 2;
2103
2104                         s->session->master_key_length=
2105                                 s->method->ssl3_enc->generate_master_secret(s,
2106                                         s->session->master_key,
2107                                         tmp_buf, sizeof tmp_buf);
2108
2109                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2110                         OPENSSL_cleanse(epms, outl);
2111                         }
2112 #endif
2113 #ifndef OPENSSL_NO_DH
2114                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2115                         {
2116                         DH *dh_srvr,*dh_clnt;
2117
2118                         if (s->session->sess_cert == NULL)
2119                                 {
2120                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2121                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2122                                 goto err;
2123                                 }
2124
2125                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2126                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2127                         else
2128                                 {
2129                                 /* we get them from the cert */
2130                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2131                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2132                                 goto err;
2133                                 }
2134
2135                         /* generate a new random key */
2136                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2137                                 {
2138                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2139                                 goto err;
2140                                 }
2141                         if (!DH_generate_key(dh_clnt))
2142                                 {
2143                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2144                                 goto err;
2145                                 }
2146
2147                         /* use the 'p' output buffer for the DH key, but
2148                          * make sure to clear it out afterwards */
2149
2150                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2151
2152                         if (n <= 0)
2153                                 {
2154                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2155                                 goto err;
2156                                 }
2157
2158                         /* generate master key from the result */
2159                         s->session->master_key_length=
2160                                 s->method->ssl3_enc->generate_master_secret(s,
2161                                         s->session->master_key,p,n);
2162                         /* clean up */
2163                         memset(p,0,n);
2164
2165                         /* send off the data */
2166                         n=BN_num_bytes(dh_clnt->pub_key);
2167                         s2n(n,p);
2168                         BN_bn2bin(dh_clnt->pub_key,p);
2169                         n+=2;
2170
2171                         DH_free(dh_clnt);
2172
2173                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2174                         }
2175 #endif
2176
2177 #ifndef OPENSSL_NO_ECDH
2178                 else if ((l & SSL_kECDH) || (l & SSL_kECDHE))
2179                         {
2180                         const EC_GROUP *srvr_group = NULL;
2181                         EC_KEY *tkey;
2182                         int ecdh_clnt_cert = 0;
2183                         int field_size = 0;
2184
2185                         if (s->session->sess_cert == NULL)
2186                                 {
2187                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2188                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2189                                 goto err;
2190                                 }
2191
2192                         /* Did we send out the client's
2193                          * ECDH share for use in premaster
2194                          * computation as part of client certificate?
2195                          * If so, set ecdh_clnt_cert to 1.
2196                          */
2197                         if ((l & SSL_kECDH) && (s->cert != NULL))
2198                                 {
2199                                 /* XXX: For now, we do not support client
2200                                  * authentication using ECDH certificates.
2201                                  * To add such support, one needs to add
2202                                  * code that checks for appropriate
2203                                  * conditions and sets ecdh_clnt_cert to 1.
2204                                  * For example, the cert have an ECC
2205                                  * key on the same curve as the server's
2206                                  * and the key should be authorized for
2207                                  * key agreement.
2208                                  *
2209                                  * One also needs to add code in ssl3_connect
2210                                  * to skip sending the certificate verify
2211                                  * message.
2212                                  *
2213                                  * if ((s->cert->key->privatekey != NULL) &&
2214                                  *     (s->cert->key->privatekey->type ==
2215                                  *      EVP_PKEY_EC) && ...)
2216                                  * ecdh_clnt_cert = 1;
2217                                  */
2218                                 }
2219
2220                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2221                                 {
2222                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2223                                 }
2224                         else
2225                                 {
2226                                 /* Get the Server Public Key from Cert */
2227                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2228                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2229                                 if ((srvr_pub_pkey == NULL) ||
2230                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2231                                     (srvr_pub_pkey->pkey.ec == NULL))
2232                                         {
2233                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2234                                             ERR_R_INTERNAL_ERROR);
2235                                         goto err;
2236                                         }
2237
2238                                 tkey = srvr_pub_pkey->pkey.ec;
2239                                 }
2240
2241                         srvr_group   = EC_KEY_get0_group(tkey);
2242                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2243
2244                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2245                                 {
2246                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2247                                     ERR_R_INTERNAL_ERROR);
2248                                 goto err;
2249                                 }
2250
2251                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2252                                 {
2253                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2254                                 goto err;
2255                                 }
2256
2257                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2258                                 {
2259                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2260                                 goto err;
2261                                 }
2262                         if (ecdh_clnt_cert)
2263                                 {
2264                                 /* Reuse key info from our certificate
2265                                  * We only need our private key to perform
2266                                  * the ECDH computation.
2267                                  */
2268                                 const BIGNUM *priv_key;
2269                                 tkey = s->cert->key->privatekey->pkey.ec;
2270                                 priv_key = EC_KEY_get0_private_key(tkey);
2271                                 if (priv_key == NULL)
2272                                         {
2273                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2274                                         goto err;
2275                                         }
2276                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2277                                         {
2278                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2279                                         goto err;
2280                                         }
2281                                 }
2282                         else
2283                                 {
2284                                 /* Generate a new ECDH key pair */
2285                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2286                                         {
2287                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2288                                         goto err;
2289                                         }
2290                                 }
2291
2292                         /* use the 'p' output buffer for the ECDH key, but
2293                          * make sure to clear it out afterwards
2294                          */
2295
2296                         field_size = EC_GROUP_get_degree(srvr_group);
2297                         if (field_size <= 0)
2298                                 {
2299                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2300                                        ERR_R_ECDH_LIB);
2301                                 goto err;
2302                                 }
2303                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2304                         if (n <= 0)
2305                                 {
2306                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2307                                        ERR_R_ECDH_LIB);
2308                                 goto err;
2309                                 }
2310
2311                         /* generate master key from the result */
2312                         s->session->master_key_length = s->method->ssl3_enc \
2313                             -> generate_master_secret(s,
2314                                 s->session->master_key,
2315                                 p, n);
2316
2317                         memset(p, 0, n); /* clean up */
2318
2319                         if (ecdh_clnt_cert)
2320                                 {
2321                                 /* Send empty client key exch message */
2322                                 n = 0;
2323                                 }
2324                         else
2325                                 {
2326                                 /* First check the size of encoding and
2327                                  * allocate memory accordingly.
2328                                  */
2329                                 encoded_pt_len =
2330                                     EC_POINT_point2oct(srvr_group,
2331                                         EC_KEY_get0_public_key(clnt_ecdh),
2332                                         POINT_CONVERSION_UNCOMPRESSED,
2333                                         NULL, 0, NULL);
2334
2335                                 encodedPoint = (unsigned char *)
2336                                     OPENSSL_malloc(encoded_pt_len *
2337                                         sizeof(unsigned char));
2338                                 bn_ctx = BN_CTX_new();
2339                                 if ((encodedPoint == NULL) ||
2340                                     (bn_ctx == NULL))
2341                                         {
2342                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2343                                         goto err;
2344                                         }
2345
2346                                 /* Encode the public key */
2347                                 n = EC_POINT_point2oct(srvr_group,
2348                                     EC_KEY_get0_public_key(clnt_ecdh),
2349                                     POINT_CONVERSION_UNCOMPRESSED,
2350                                     encodedPoint, encoded_pt_len, bn_ctx);
2351
2352                                 *p = n; /* length of encoded point */
2353                                 /* Encoded point will be copied here */
2354                                 p += 1;
2355                                 /* copy the point */
2356                                 memcpy((unsigned char *)p, encodedPoint, n);
2357                                 /* increment n to account for length field */
2358                                 n += 1;
2359                                 }
2360
2361                         /* Free allocated memory */
2362                         BN_CTX_free(bn_ctx);
2363                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2364                         if (clnt_ecdh != NULL)
2365                                  EC_KEY_free(clnt_ecdh);
2366                         EVP_PKEY_free(srvr_pub_pkey);
2367                         }
2368 #endif /* !OPENSSL_NO_ECDH */
2369                 else
2370                         {
2371                         ssl3_send_alert(s, SSL3_AL_FATAL,
2372                             SSL_AD_HANDSHAKE_FAILURE);
2373                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2374                             ERR_R_INTERNAL_ERROR);
2375                         goto err;
2376                         }
2377
2378                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2379                 l2n3(n,d);
2380
2381                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2382                 /* number of bytes to write */
2383                 s->init_num=n+4;
2384                 s->init_off=0;
2385                 }
2386
2387         /* SSL3_ST_CW_KEY_EXCH_B */
2388         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2389 err:
2390 #ifndef OPENSSL_NO_ECDH
2391         BN_CTX_free(bn_ctx);
2392         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2393         if (clnt_ecdh != NULL)
2394                 EC_KEY_free(clnt_ecdh);
2395         EVP_PKEY_free(srvr_pub_pkey);
2396 #endif
2397         return(-1);
2398         }
2399
2400 int ssl3_send_client_verify(SSL *s)
2401         {
2402         unsigned char *p,*d;
2403         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2404         EVP_PKEY *pkey;
2405 #ifndef OPENSSL_NO_RSA
2406         unsigned u=0;
2407 #endif
2408         unsigned long n;
2409 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
2410         int j;
2411 #endif
2412
2413         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2414                 {
2415                 d=(unsigned char *)s->init_buf->data;
2416                 p= &(d[4]);
2417                 pkey=s->cert->key->privatekey;
2418
2419                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
2420                         &(data[MD5_DIGEST_LENGTH]));
2421
2422 #ifndef OPENSSL_NO_RSA
2423                 if (pkey->type == EVP_PKEY_RSA)
2424                         {
2425                         s->method->ssl3_enc->cert_verify_mac(s,
2426                                 &(s->s3->finish_dgst1),&(data[0]));
2427                         if (RSA_sign(NID_md5_sha1, data,
2428                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2429                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2430                                 {
2431                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2432                                 goto err;
2433                                 }
2434                         s2n(u,p);
2435                         n=u+2;
2436                         }
2437                 else
2438 #endif
2439 #ifndef OPENSSL_NO_DSA
2440                         if (pkey->type == EVP_PKEY_DSA)
2441                         {
2442                         if (!DSA_sign(pkey->save_type,
2443                                 &(data[MD5_DIGEST_LENGTH]),
2444                                 SHA_DIGEST_LENGTH,&(p[2]),
2445                                 (unsigned int *)&j,pkey->pkey.dsa))
2446                                 {
2447                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2448                                 goto err;
2449                                 }
2450                         s2n(j,p);
2451                         n=j+2;
2452                         }
2453                 else
2454 #endif
2455 #ifndef OPENSSL_NO_ECDSA
2456                         if (pkey->type == EVP_PKEY_EC)
2457                         {
2458                         if (!ECDSA_sign(pkey->save_type,
2459                                 &(data[MD5_DIGEST_LENGTH]),
2460                                 SHA_DIGEST_LENGTH,&(p[2]),
2461                                 (unsigned int *)&j,pkey->pkey.ec))
2462                                 {
2463                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2464                                     ERR_R_ECDSA_LIB);
2465                                 goto err;
2466                                 }
2467                         s2n(j,p);
2468                         n=j+2;
2469                         }
2470                 else
2471 #endif
2472                         {
2473                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2474                         goto err;
2475                         }
2476                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2477                 l2n3(n,d);
2478
2479                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2480                 s->init_num=(int)n+4;
2481                 s->init_off=0;
2482                 }
2483         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2484 err:
2485         return(-1);
2486         }
2487
2488 int ssl3_send_client_certificate(SSL *s)
2489         {
2490         X509 *x509=NULL;
2491         EVP_PKEY *pkey=NULL;
2492         int i;
2493         unsigned long l;
2494
2495         if (s->state == SSL3_ST_CW_CERT_A)
2496                 {
2497                 if ((s->cert == NULL) ||
2498                         (s->cert->key->x509 == NULL) ||
2499                         (s->cert->key->privatekey == NULL))
2500                         s->state=SSL3_ST_CW_CERT_B;
2501                 else
2502                         s->state=SSL3_ST_CW_CERT_C;
2503                 }
2504
2505         /* We need to get a client cert */
2506         if (s->state == SSL3_ST_CW_CERT_B)
2507                 {
2508                 /* If we get an error, we need to
2509                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2510                  * We then get retied later */
2511                 i=0;
2512                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
2513                 if (i < 0)
2514                         {
2515                         s->rwstate=SSL_X509_LOOKUP;
2516                         return(-1);
2517                         }
2518                 s->rwstate=SSL_NOTHING;
2519                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2520                         {
2521                         s->state=SSL3_ST_CW_CERT_B;
2522                         if (    !SSL_use_certificate(s,x509) ||
2523                                 !SSL_use_PrivateKey(s,pkey))
2524                                 i=0;
2525                         }
2526                 else if (i == 1)
2527                         {
2528                         i=0;
2529                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2530                         }
2531
2532                 if (x509 != NULL) X509_free(x509);
2533                 if (pkey != NULL) EVP_PKEY_free(pkey);
2534                 if (i == 0)
2535                         {
2536                         if (s->version == SSL3_VERSION)
2537                                 {
2538                                 s->s3->tmp.cert_req=0;
2539                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2540                                 return(1);
2541                                 }
2542                         else
2543                                 {
2544                                 s->s3->tmp.cert_req=2;
2545                                 }
2546                         }
2547
2548                 /* Ok, we have a cert */
2549                 s->state=SSL3_ST_CW_CERT_C;
2550                 }
2551
2552         if (s->state == SSL3_ST_CW_CERT_C)
2553                 {
2554                 s->state=SSL3_ST_CW_CERT_D;
2555                 l=ssl3_output_cert_chain(s,
2556                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2557                 s->init_num=(int)l;
2558                 s->init_off=0;
2559                 }
2560         /* SSL3_ST_CW_CERT_D */
2561         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2562         }
2563
2564 #define has_bits(i,m)   (((i)&(m)) == (m))
2565
2566 int ssl3_check_cert_and_algorithm(SSL *s)
2567         {
2568         int i,idx;
2569         long algs;
2570         EVP_PKEY *pkey=NULL;
2571         SESS_CERT *sc;
2572 #ifndef OPENSSL_NO_RSA
2573         RSA *rsa;
2574 #endif
2575 #ifndef OPENSSL_NO_DH
2576         DH *dh;
2577 #endif
2578
2579         sc=s->session->sess_cert;
2580
2581         algs=s->s3->tmp.new_cipher->algorithms;
2582
2583         /* we don't have a certificate */
2584         if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
2585                 return(1);
2586
2587         if (sc == NULL)
2588                 {
2589                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2590                 goto err;
2591                 }
2592
2593 #ifndef OPENSSL_NO_RSA
2594         rsa=s->session->sess_cert->peer_rsa_tmp;
2595 #endif
2596 #ifndef OPENSSL_NO_DH
2597         dh=s->session->sess_cert->peer_dh_tmp;
2598 #endif
2599
2600         /* This is the passed certificate */
2601
2602         idx=sc->peer_cert_type;
2603 #ifndef OPENSSL_NO_ECDH
2604         if (idx == SSL_PKEY_ECC)
2605                 {
2606                 if (check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2607                     s->s3->tmp.new_cipher) == 0)
2608                         { /* check failed */
2609                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2610                         goto f_err;
2611                         }
2612                 else
2613                         {
2614                         return 1;
2615                         }
2616                 }
2617 #endif
2618         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2619         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2620         EVP_PKEY_free(pkey);
2621
2622
2623         /* Check that we have a certificate if we require one */
2624         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2625                 {
2626                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2627                 goto f_err;
2628                 }
2629 #ifndef OPENSSL_NO_DSA
2630         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2631                 {
2632                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2633                 goto f_err;
2634                 }
2635 #endif
2636 #ifndef OPENSSL_NO_RSA
2637         if ((algs & SSL_kRSA) &&
2638                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2639                 {
2640                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2641                 goto f_err;
2642                 }
2643 #endif
2644 #ifndef OPENSSL_NO_DH
2645         if ((algs & SSL_kEDH) &&
2646                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2647                 {
2648                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2649                 goto f_err;
2650                 }
2651         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2652                 {
2653                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2654                 goto f_err;
2655                 }
2656 #ifndef OPENSSL_NO_DSA
2657         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2658                 {
2659                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2660                 goto f_err;
2661                 }
2662 #endif
2663 #endif
2664
2665         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2666                 {
2667 #ifndef OPENSSL_NO_RSA
2668                 if (algs & SSL_kRSA)
2669                         {
2670                         if (rsa == NULL
2671                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2672                                 {
2673                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2674                                 goto f_err;
2675                                 }
2676                         }
2677                 else
2678 #endif
2679 #ifndef OPENSSL_NO_DH
2680                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2681                             {
2682                             if (dh == NULL
2683                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2684                                 {
2685                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2686                                 goto f_err;
2687                                 }
2688                         }
2689                 else
2690 #endif
2691                         {
2692                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2693                         goto f_err;
2694                         }
2695                 }
2696         return(1);
2697 f_err:
2698         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2699 err:
2700         return(0);
2701         }
2702
2703
2704 #ifndef OPENSSL_NO_ECDH
2705 /* This is the complement of nid2curve_id in s3_srvr.c. */
2706 static int curve_id2nid(int curve_id)
2707 {
2708         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2709          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2710         static int nid_list[26] =
2711         {
2712                 0,
2713                 NID_sect163k1, /* sect163k1 (1) */
2714                 NID_sect163r1, /* sect163r1 (2) */
2715                 NID_sect163r2, /* sect163r2 (3) */
2716                 NID_sect193r1, /* sect193r1 (4) */
2717                 NID_sect193r2, /* sect193r2 (5) */
2718                 NID_sect233k1, /* sect233k1 (6) */
2719                 NID_sect233r1, /* sect233r1 (7) */
2720                 NID_sect239k1, /* sect239k1 (8) */
2721                 NID_sect283k1, /* sect283k1 (9) */
2722                 NID_sect283r1, /* sect283r1 (10) */
2723                 NID_sect409k1, /* sect409k1 (11) */
2724                 NID_sect409r1, /* sect409r1 (12) */
2725                 NID_sect571k1, /* sect571k1 (13) */
2726                 NID_sect571r1, /* sect571r1 (14) */
2727                 NID_secp160k1, /* secp160k1 (15) */
2728                 NID_secp160r1, /* secp160r1 (16) */
2729                 NID_secp160r2, /* secp160r2 (17) */
2730                 NID_secp192k1, /* secp192k1 (18) */
2731                 NID_X9_62_prime192v1, /* secp192r1 (19) */
2732                 NID_secp224k1, /* secp224k1 (20) */
2733                 NID_secp224r1, /* secp224r1 (21) */
2734                 NID_secp256k1, /* secp256k1 (22) */
2735                 NID_X9_62_prime256v1, /* secp256r1 (23) */
2736                 NID_secp384r1, /* secp384r1 (24) */
2737                 NID_secp521r1  /* secp521r1 (25) */
2738         };
2739
2740         if ((curve_id < 1) || (curve_id > 25)) return 0;
2741
2742         return nid_list[curve_id];
2743 }
2744 #endif
2745
2746 /* Check to see if handshake is full or resumed. Usually this is just a
2747  * case of checking to see if a cache hit has occurred. In the case of
2748  * session tickets we have to check the next message to be sure.
2749  */
2750
2751 #ifndef OPENSSL_NO_TLSEXT
2752 int ssl3_check_finished(SSL *s)
2753         {
2754         int ok;
2755         long n;
2756         /* If we have no ticket or session ID is non-zero length (a match of
2757          * a non-zero session length would never reach here) it cannot be a
2758          * resumed session.
2759          */
2760         if (!s->session->tlsext_tick || s->session->session_id_length)
2761                 return 1;
2762         /* this function is called when we really expect a Certificate
2763          * message, so permit appropriate message length */
2764         n=s->method->ssl_get_message(s,
2765                 SSL3_ST_CR_CERT_A,
2766                 SSL3_ST_CR_CERT_B,
2767                 -1,
2768                 s->max_cert_list,
2769                 &ok);
2770         if (!ok) return((int)n);
2771         s->s3->tmp.reuse_message = 1;
2772         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
2773                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
2774                 return 2;
2775
2776         return 1;
2777         }
2778 #endif
2779
2780 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
2781         {
2782         int i = 0;
2783 #ifndef OPENSSL_NO_ENGINE
2784         if (s->ctx->client_cert_engine)
2785                 {
2786                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
2787                                                 SSL_get_client_CA_list(s),
2788                                                 px509, ppkey, NULL, NULL, NULL);
2789                 if (i != 0)
2790                         return i;
2791                 }
2792 #endif
2793         if (s->ctx->client_cert_cb)
2794                 i = s->ctx->client_cert_cb(s,px509,ppkey);
2795         return i;
2796         }