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,j,ok;
1099         long i,param_len,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         alg=s->s3->tmp.new_cipher->algorithms;
1127         EVP_MD_CTX_init(&md_ctx);
1128
1129         if (s->s3->tmp.message_type != SSL3_MT_SERVER_KEY_EXCHANGE)
1130                 {
1131                 /*
1132                  * Can't skip server key exchange if this is an ephemeral
1133                  * ciphersuite.
1134                  */
1135                 if (alg & (SSL_kEDH|SSL_kECDHE))
1136                         {
1137                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
1138                         al = SSL_AD_UNEXPECTED_MESSAGE;
1139                         goto f_err;
1140                         }
1141                 s->s3->tmp.reuse_message=1;
1142                 return(1);
1143                 }
1144
1145         param=p=(unsigned char *)s->init_msg;
1146
1147         if (s->session->sess_cert != NULL)
1148                 {
1149 #ifndef OPENSSL_NO_RSA
1150                 if (s->session->sess_cert->peer_rsa_tmp != NULL)
1151                         {
1152                         RSA_free(s->session->sess_cert->peer_rsa_tmp);
1153                         s->session->sess_cert->peer_rsa_tmp=NULL;
1154                         }
1155 #endif
1156 #ifndef OPENSSL_NO_DH
1157                 if (s->session->sess_cert->peer_dh_tmp)
1158                         {
1159                         DH_free(s->session->sess_cert->peer_dh_tmp);
1160                         s->session->sess_cert->peer_dh_tmp=NULL;
1161                         }
1162 #endif
1163 #ifndef OPENSSL_NO_ECDH
1164                 if (s->session->sess_cert->peer_ecdh_tmp)
1165                         {
1166                         EC_KEY_free(s->session->sess_cert->peer_ecdh_tmp);
1167                         s->session->sess_cert->peer_ecdh_tmp=NULL;
1168                         }
1169 #endif
1170                 }
1171         else
1172                 {
1173                 s->session->sess_cert=ssl_sess_cert_new();
1174                 }
1175
1176         /* Total length of the parameters including the length prefix */
1177         param_len=0;
1178
1179         al=SSL_AD_DECODE_ERROR;
1180 #ifndef OPENSSL_NO_RSA
1181         if (alg & SSL_kRSA)
1182                 {
1183                 /* Temporary RSA keys only allowed in export ciphersuites */
1184                 if (!SSL_C_IS_EXPORT(s->s3->tmp.new_cipher))
1185                         {
1186                         al=SSL_AD_UNEXPECTED_MESSAGE;
1187                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1188                         goto f_err;
1189                         }
1190                 if ((rsa=RSA_new()) == NULL)
1191                         {
1192                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1193                         goto err;
1194                         }
1195
1196                 param_len = 2;
1197                 if (param_len > n)
1198                         {
1199                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1200                                 SSL_R_LENGTH_TOO_SHORT);
1201                         goto f_err;
1202                         }
1203                 n2s(p,i);
1204
1205                 if (i > n - param_len)
1206                         {
1207                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_MODULUS_LENGTH);
1208                         goto f_err;
1209                         }
1210                 param_len += i;
1211
1212                 if (!(rsa->n=BN_bin2bn(p,i,rsa->n)))
1213                         {
1214                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1215                         goto err;
1216                         }
1217                 p+=i;
1218
1219                 if (2 > n - param_len)
1220                         {
1221                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1222                                 SSL_R_LENGTH_TOO_SHORT);
1223                         goto f_err;
1224                         }
1225                 param_len += 2;
1226
1227                 n2s(p,i);
1228
1229                 if (i > n - param_len)
1230                         {
1231                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_E_LENGTH);
1232                         goto f_err;
1233                         }
1234                 param_len += i;
1235
1236                 if (!(rsa->e=BN_bin2bn(p,i,rsa->e)))
1237                         {
1238                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1239                         goto err;
1240                         }
1241                 p+=i;
1242                 n-=param_len;
1243
1244                 /* this should be because we are using an export cipher */
1245                 if (alg & SSL_aRSA)
1246                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1247                 else
1248                         {
1249                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1250                         goto err;
1251                         }
1252                 s->session->sess_cert->peer_rsa_tmp=rsa;
1253                 rsa=NULL;
1254                 }
1255 #else /* OPENSSL_NO_RSA */
1256         if (0)
1257                 ;
1258 #endif
1259 #ifndef OPENSSL_NO_DH
1260         else if (alg & SSL_kEDH)
1261                 {
1262                 if ((dh=DH_new()) == NULL)
1263                         {
1264                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_DH_LIB);
1265                         goto err;
1266                         }
1267
1268                 param_len = 2;
1269                 if (param_len > n)
1270                         {
1271                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1272                                 SSL_R_LENGTH_TOO_SHORT);
1273                         goto f_err;
1274                         }
1275                 n2s(p,i);
1276
1277                 if (i > n - param_len)
1278                         {
1279                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_P_LENGTH);
1280                         goto f_err;
1281                         }
1282                 param_len += i;
1283
1284                 if (!(dh->p=BN_bin2bn(p,i,NULL)))
1285                         {
1286                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1287                         goto err;
1288                         }
1289                 p+=i;
1290
1291                 if (2 > n - param_len)
1292                         {
1293                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1294                                 SSL_R_LENGTH_TOO_SHORT);
1295                         goto f_err;
1296                         }
1297                 param_len += 2;
1298
1299                 n2s(p,i);
1300
1301                 if (i > n - param_len)
1302                         {
1303                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_G_LENGTH);
1304                         goto f_err;
1305                         }
1306                 param_len += i;
1307
1308                 if (!(dh->g=BN_bin2bn(p,i,NULL)))
1309                         {
1310                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1311                         goto err;
1312                         }
1313                 p+=i;
1314
1315                 if (2 > n - param_len)
1316                         {
1317                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1318                                 SSL_R_LENGTH_TOO_SHORT);
1319                         goto f_err;
1320                         }
1321                 param_len += 2;
1322
1323                 n2s(p,i);
1324
1325                 if (i > n - param_len)
1326                         {
1327                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_DH_PUB_KEY_LENGTH);
1328                         goto f_err;
1329                         }
1330                 param_len += i;
1331
1332                 if (!(dh->pub_key=BN_bin2bn(p,i,NULL)))
1333                         {
1334                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_BN_LIB);
1335                         goto err;
1336                         }
1337                 p+=i;
1338                 n-=param_len;
1339
1340 #ifndef OPENSSL_NO_RSA
1341                 if (alg & SSL_aRSA)
1342                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1343 #else
1344                 if (0)
1345                         ;
1346 #endif
1347 #ifndef OPENSSL_NO_DSA
1348                 else if (alg & SSL_aDSS)
1349                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_DSA_SIGN].x509);
1350 #endif
1351                 /* else anonymous DH, so no certificate or pkey. */
1352
1353                 s->session->sess_cert->peer_dh_tmp=dh;
1354                 dh=NULL;
1355                 }
1356         else if ((alg & SSL_kDHr) || (alg & SSL_kDHd))
1357                 {
1358                 al=SSL_AD_ILLEGAL_PARAMETER;
1359                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1360                 goto f_err;
1361                 }
1362 #endif /* !OPENSSL_NO_DH */
1363
1364 #ifndef OPENSSL_NO_ECDH
1365         else if (alg & SSL_kECDHE)
1366                 {
1367                 EC_GROUP *ngroup;
1368                 const EC_GROUP *group;
1369
1370                 if ((ecdh=EC_KEY_new()) == NULL)
1371                         {
1372                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1373                         goto err;
1374                         }
1375
1376                 /* Extract elliptic curve parameters and the
1377                  * server's ephemeral ECDH public key.
1378                  * Keep accumulating lengths of various components in
1379                  * param_len and make sure it never exceeds n.
1380                  */
1381
1382                 /* XXX: For now we only support named (not generic) curves
1383                  * and the ECParameters in this case is just three bytes. We
1384                  * also need one byte for the length of the encoded point
1385                  */
1386                 param_len=4;
1387                 if (param_len > n)
1388                         {
1389                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,
1390                                 SSL_R_LENGTH_TOO_SHORT);
1391                         goto f_err;
1392                         }
1393
1394                 if ((*p != NAMED_CURVE_TYPE) ||
1395                     ((curve_nid = curve_id2nid(*(p + 2))) == 0))
1396                         {
1397                         al=SSL_AD_INTERNAL_ERROR;
1398                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
1399                         goto f_err;
1400                         }
1401
1402                 ngroup = EC_GROUP_new_by_curve_name(curve_nid);
1403                 if (ngroup == NULL)
1404                         {
1405                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1406                         goto err;
1407                         }
1408                 if (EC_KEY_set_group(ecdh, ngroup) == 0)
1409                         {
1410                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_EC_LIB);
1411                         goto err;
1412                         }
1413                 EC_GROUP_free(ngroup);
1414
1415                 group = EC_KEY_get0_group(ecdh);
1416
1417                 if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) &&
1418                     (EC_GROUP_get_degree(group) > 163))
1419                         {
1420                         al=SSL_AD_EXPORT_RESTRICTION;
1421                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_ECGROUP_TOO_LARGE_FOR_CIPHER);
1422                         goto f_err;
1423                         }
1424
1425                 p+=3;
1426
1427                 /* Next, get the encoded ECPoint */
1428                 if (((srvr_ecpoint = EC_POINT_new(group)) == NULL) ||
1429                     ((bn_ctx = BN_CTX_new()) == NULL))
1430                         {
1431                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
1432                         goto err;
1433                         }
1434
1435                 encoded_pt_len = *p;  /* length of encoded point */
1436                 p+=1;
1437
1438                 if ((encoded_pt_len > n - param_len) ||
1439                     (EC_POINT_oct2point(group, srvr_ecpoint,
1440                         p, encoded_pt_len, bn_ctx) == 0))
1441                         {
1442                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_ECPOINT);
1443                         goto f_err;
1444                         }
1445                 param_len += encoded_pt_len;
1446
1447                 n-=param_len;
1448                 p+=encoded_pt_len;
1449
1450                 /* The ECC/TLS specification does not mention
1451                  * the use of DSA to sign ECParameters in the server
1452                  * key exchange message. We do support RSA and ECDSA.
1453                  */
1454                 if (0) ;
1455 #ifndef OPENSSL_NO_RSA
1456                 else if (alg & SSL_aRSA)
1457                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
1458 #endif
1459 #ifndef OPENSSL_NO_ECDSA
1460                 else if (alg & SSL_aECDSA)
1461                         pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
1462 #endif
1463                 /* else anonymous ECDH, so no certificate or pkey. */
1464                 EC_KEY_set_public_key(ecdh, srvr_ecpoint);
1465                 s->session->sess_cert->peer_ecdh_tmp=ecdh;
1466                 ecdh=NULL;
1467                 BN_CTX_free(bn_ctx);
1468                 bn_ctx = NULL;
1469                 EC_POINT_free(srvr_ecpoint);
1470                 srvr_ecpoint = NULL;
1471                 }
1472         else if (alg & SSL_kECDH)
1473                 {
1474                 al=SSL_AD_UNEXPECTED_MESSAGE;
1475                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
1476                 goto f_err;
1477                 }
1478 #endif /* !OPENSSL_NO_ECDH */
1479         if (alg & SSL_aFZA)
1480                 {
1481                 al=SSL_AD_HANDSHAKE_FAILURE;
1482                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_TRIED_TO_USE_UNSUPPORTED_CIPHER);
1483                 goto f_err;
1484                 }
1485
1486
1487         /* p points to the next byte, there are 'n' bytes left */
1488
1489         /* if it was signed, check the signature */
1490         if (pkey != NULL)
1491                 {
1492                 n2s(p,i);
1493                 n-=2;
1494                 j=EVP_PKEY_size(pkey);
1495
1496                 /* Check signature length. If n is 0 then signature is empty */
1497                 if ((i != n) || (n > j) || (n <= 0))
1498                         {
1499                         /* wrong packet length */
1500                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_WRONG_SIGNATURE_LENGTH);
1501                         goto f_err;
1502                         }
1503
1504 #ifndef OPENSSL_NO_RSA
1505                 if (pkey->type == EVP_PKEY_RSA)
1506                         {
1507                         int num;
1508                         unsigned int size;
1509
1510                         j=0;
1511                         q=md_buf;
1512                         for (num=2; num > 0; num--)
1513                                 {
1514                                 EVP_MD_CTX_set_flags(&md_ctx,
1515                                         EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
1516                                 EVP_DigestInit_ex(&md_ctx,(num == 2)
1517                                         ?s->ctx->md5:s->ctx->sha1, NULL);
1518                                 EVP_DigestUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1519                                 EVP_DigestUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1520                                 EVP_DigestUpdate(&md_ctx,param,param_len);
1521                                 EVP_DigestFinal_ex(&md_ctx,q,&size);
1522                                 q+=size;
1523                                 j+=size;
1524                                 }
1525                         i=RSA_verify(NID_md5_sha1, md_buf, j, p, n,
1526                                                                 pkey->pkey.rsa);
1527                         if (i < 0)
1528                                 {
1529                                 al=SSL_AD_DECRYPT_ERROR;
1530                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_RSA_DECRYPT);
1531                                 goto f_err;
1532                                 }
1533                         if (i == 0)
1534                                 {
1535                                 /* bad signature */
1536                                 al=SSL_AD_DECRYPT_ERROR;
1537                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1538                                 goto f_err;
1539                                 }
1540                         }
1541                 else
1542 #endif
1543 #ifndef OPENSSL_NO_DSA
1544                         if (pkey->type == EVP_PKEY_DSA)
1545                         {
1546                         /* lets do DSS */
1547                         EVP_VerifyInit_ex(&md_ctx,EVP_dss1(), NULL);
1548                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1549                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1550                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1551                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1552                                 {
1553                                 /* bad signature */
1554                                 al=SSL_AD_DECRYPT_ERROR;
1555                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1556                                 goto f_err;
1557                                 }
1558                         }
1559                 else
1560 #endif
1561 #ifndef OPENSSL_NO_ECDSA
1562                         if (pkey->type == EVP_PKEY_EC)
1563                         {
1564                         /* let's do ECDSA */
1565                         EVP_VerifyInit_ex(&md_ctx,EVP_ecdsa(), NULL);
1566                         EVP_VerifyUpdate(&md_ctx,&(s->s3->client_random[0]),SSL3_RANDOM_SIZE);
1567                         EVP_VerifyUpdate(&md_ctx,&(s->s3->server_random[0]),SSL3_RANDOM_SIZE);
1568                         EVP_VerifyUpdate(&md_ctx,param,param_len);
1569                         if (EVP_VerifyFinal(&md_ctx,p,(int)n,pkey) <= 0)
1570                                 {
1571                                 /* bad signature */
1572                                 al=SSL_AD_DECRYPT_ERROR;
1573                                 SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_BAD_SIGNATURE);
1574                                 goto f_err;
1575                                 }
1576                         }
1577                 else
1578 #endif
1579                         {
1580                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1581                         goto err;
1582                         }
1583                 }
1584         else
1585                 {
1586                 /* still data left over */
1587                 if (!(alg & SSL_aNULL))
1588                         {
1589                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1590                         goto err;
1591                         }
1592                 if (n != 0)
1593                         {
1594                         SSLerr(SSL_F_SSL3_GET_KEY_EXCHANGE,SSL_R_EXTRA_DATA_IN_MESSAGE);
1595                         goto f_err;
1596                         }
1597                 }
1598         EVP_PKEY_free(pkey);
1599         EVP_MD_CTX_cleanup(&md_ctx);
1600         return(1);
1601 f_err:
1602         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1603 err:
1604         EVP_PKEY_free(pkey);
1605 #ifndef OPENSSL_NO_RSA
1606         if (rsa != NULL)
1607                 RSA_free(rsa);
1608 #endif
1609 #ifndef OPENSSL_NO_DH
1610         if (dh != NULL)
1611                 DH_free(dh);
1612 #endif
1613 #ifndef OPENSSL_NO_ECDH
1614         BN_CTX_free(bn_ctx);
1615         EC_POINT_free(srvr_ecpoint);
1616         if (ecdh != NULL)
1617                 EC_KEY_free(ecdh);
1618 #endif
1619         EVP_MD_CTX_cleanup(&md_ctx);
1620         return(-1);
1621         }
1622
1623 int ssl3_get_certificate_request(SSL *s)
1624         {
1625         int ok,ret=0;
1626         unsigned long n,nc,l;
1627         unsigned int llen,ctype_num,i;
1628         X509_NAME *xn=NULL;
1629         const unsigned char *p,*q;
1630         unsigned char *d;
1631         STACK_OF(X509_NAME) *ca_sk=NULL;
1632
1633         n=s->method->ssl_get_message(s,
1634                 SSL3_ST_CR_CERT_REQ_A,
1635                 SSL3_ST_CR_CERT_REQ_B,
1636                 -1,
1637                 s->max_cert_list,
1638                 &ok);
1639
1640         if (!ok) return((int)n);
1641
1642         s->s3->tmp.cert_req=0;
1643
1644         if (s->s3->tmp.message_type == SSL3_MT_SERVER_DONE)
1645                 {
1646                 s->s3->tmp.reuse_message=1;
1647                 return(1);
1648                 }
1649
1650         if (s->s3->tmp.message_type != SSL3_MT_CERTIFICATE_REQUEST)
1651                 {
1652                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1653                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_WRONG_MESSAGE_TYPE);
1654                 goto err;
1655                 }
1656
1657         /* TLS does not like anon-DH with client cert */
1658         if (s->version > SSL3_VERSION)
1659                 {
1660                 l=s->s3->tmp.new_cipher->algorithms;
1661                 if (l & SSL_aNULL)
1662                         {
1663                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
1664                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_TLS_CLIENT_CERT_REQ_WITH_ANON_CIPHER);
1665                         goto err;
1666                         }
1667                 }
1668
1669         p=d=(unsigned char *)s->init_msg;
1670
1671         if ((ca_sk=sk_X509_NAME_new(ca_dn_cmp)) == NULL)
1672                 {
1673                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1674                 goto err;
1675                 }
1676
1677         /* get the certificate types */
1678         ctype_num= *(p++);
1679         if (ctype_num > SSL3_CT_NUMBER)
1680                 ctype_num=SSL3_CT_NUMBER;
1681         for (i=0; i<ctype_num; i++)
1682                 s->s3->tmp.ctype[i]= p[i];
1683         p+=ctype_num;
1684
1685         /* get the CA RDNs */
1686         n2s(p,llen);
1687 #if 0
1688 {
1689 FILE *out;
1690 out=fopen("/tmp/vsign.der","w");
1691 fwrite(p,1,llen,out);
1692 fclose(out);
1693 }
1694 #endif
1695
1696         if ((llen+ctype_num+2+1) != n)
1697                 {
1698                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1699                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_LENGTH_MISMATCH);
1700                 goto err;
1701                 }
1702
1703         for (nc=0; nc<llen; )
1704                 {
1705                 n2s(p,l);
1706                 if ((l+nc+2) > llen)
1707                         {
1708                         if ((s->options & SSL_OP_NETSCAPE_CA_DN_BUG))
1709                                 goto cont; /* netscape bugs */
1710                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1711                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_TOO_LONG);
1712                         goto err;
1713                         }
1714
1715                 q=p;
1716
1717                 if ((xn=d2i_X509_NAME(NULL,&q,l)) == NULL)
1718                         {
1719                         /* If netscape tolerance is on, ignore errors */
1720                         if (s->options & SSL_OP_NETSCAPE_CA_DN_BUG)
1721                                 goto cont;
1722                         else
1723                                 {
1724                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1725                                 SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_ASN1_LIB);
1726                                 goto err;
1727                                 }
1728                         }
1729
1730                 if (q != (p+l))
1731                         {
1732                         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1733                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,SSL_R_CA_DN_LENGTH_MISMATCH);
1734                         goto err;
1735                         }
1736                 if (!sk_X509_NAME_push(ca_sk,xn))
1737                         {
1738                         SSLerr(SSL_F_SSL3_GET_CERTIFICATE_REQUEST,ERR_R_MALLOC_FAILURE);
1739                         goto err;
1740                         }
1741
1742                 p+=l;
1743                 nc+=l+2;
1744                 }
1745
1746         if (0)
1747                 {
1748 cont:
1749                 ERR_clear_error();
1750                 }
1751
1752         /* we should setup a certificate to return.... */
1753         s->s3->tmp.cert_req=1;
1754         s->s3->tmp.ctype_num=ctype_num;
1755         if (s->s3->tmp.ca_names != NULL)
1756                 sk_X509_NAME_pop_free(s->s3->tmp.ca_names,X509_NAME_free);
1757         s->s3->tmp.ca_names=ca_sk;
1758         ca_sk=NULL;
1759
1760         ret=1;
1761 err:
1762         if (ca_sk != NULL) sk_X509_NAME_pop_free(ca_sk,X509_NAME_free);
1763         return(ret);
1764         }
1765
1766 static int ca_dn_cmp(const X509_NAME * const *a, const X509_NAME * const *b)
1767         {
1768         return(X509_NAME_cmp(*a,*b));
1769         }
1770 #ifndef OPENSSL_NO_TLSEXT
1771 int ssl3_get_new_session_ticket(SSL *s)
1772         {
1773         int ok,al,ret=0, ticklen;
1774         long n;
1775         const unsigned char *p;
1776         unsigned char *d;
1777
1778         n=s->method->ssl_get_message(s,
1779                 SSL3_ST_CR_SESSION_TICKET_A,
1780                 SSL3_ST_CR_SESSION_TICKET_B,
1781                 -1,
1782                 16384,
1783                 &ok);
1784
1785         if (!ok)
1786                 return((int)n);
1787
1788         if (s->s3->tmp.message_type == SSL3_MT_FINISHED)
1789                 {
1790                 s->s3->tmp.reuse_message=1;
1791                 return(1);
1792                 }
1793         if (s->s3->tmp.message_type != SSL3_MT_NEWSESSION_TICKET)
1794                 {
1795                 al=SSL_AD_UNEXPECTED_MESSAGE;
1796                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_BAD_MESSAGE_TYPE);
1797                 goto f_err;
1798                 }
1799         if (n < 6)
1800                 {
1801                 /* need at least ticket_lifetime_hint + ticket length */
1802                 al = SSL_AD_DECODE_ERROR;
1803                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1804                 goto f_err;
1805                 }
1806
1807         p=d=(unsigned char *)s->init_msg;
1808         n2l(p, s->session->tlsext_tick_lifetime_hint);
1809         n2s(p, ticklen);
1810         /* ticket_lifetime_hint + ticket_length + ticket */
1811         if (ticklen + 6 != n)
1812                 {
1813                 al = SSL_AD_DECODE_ERROR;
1814                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,SSL_R_LENGTH_MISMATCH);
1815                 goto f_err;
1816                 }
1817         if (s->session->tlsext_tick)
1818                 {
1819                 OPENSSL_free(s->session->tlsext_tick);
1820                 s->session->tlsext_ticklen = 0;
1821                 }
1822         s->session->tlsext_tick = OPENSSL_malloc(ticklen);
1823         if (!s->session->tlsext_tick)
1824                 {
1825                 SSLerr(SSL_F_SSL3_GET_NEW_SESSION_TICKET,ERR_R_MALLOC_FAILURE);
1826                 goto err;
1827                 }
1828         memcpy(s->session->tlsext_tick, p, ticklen);
1829         s->session->tlsext_ticklen = ticklen;
1830         /* There are two ways to detect a resumed ticket sesion.
1831          * One is to set an appropriate session ID and then the server
1832          * must return a match in ServerHello. This allows the normal
1833          * client session ID matching to work and we know much
1834          * earlier that the ticket has been accepted.
1835          *
1836          * The other way is to set zero length session ID when the
1837          * ticket is presented and rely on the handshake to determine
1838          * session resumption.
1839          *
1840          * We choose the former approach because this fits in with
1841          * assumptions elsewhere in OpenSSL. The session ID is set
1842          * to the SHA256 (or SHA1 is SHA256 is disabled) hash of the
1843          * ticket.
1844          */
1845         EVP_Digest(p, ticklen,
1846                         s->session->session_id, &s->session->session_id_length,
1847 #ifndef OPENSSL_NO_SHA256
1848                                                         EVP_sha256(), NULL);
1849 #else
1850                                                         EVP_sha1(), NULL);
1851 #endif
1852         ret=1;
1853         return(ret);
1854 f_err:
1855         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1856 err:
1857         return(-1);
1858         }
1859
1860 int ssl3_get_cert_status(SSL *s)
1861         {
1862         int ok, al;
1863         unsigned long resplen;
1864         long n;
1865         const unsigned char *p;
1866
1867         n=s->method->ssl_get_message(s,
1868                 SSL3_ST_CR_CERT_STATUS_A,
1869                 SSL3_ST_CR_CERT_STATUS_B,
1870                 SSL3_MT_CERTIFICATE_STATUS,
1871                 16384,
1872                 &ok);
1873
1874         if (!ok) return((int)n);
1875         if (n < 4)
1876                 {
1877                 /* need at least status type + length */
1878                 al = SSL_AD_DECODE_ERROR;
1879                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1880                 goto f_err;
1881                 }
1882         p = (unsigned char *)s->init_msg;
1883         if (*p++ != TLSEXT_STATUSTYPE_ocsp)
1884                 {
1885                 al = SSL_AD_DECODE_ERROR;
1886                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_UNSUPPORTED_STATUS_TYPE);
1887                 goto f_err;
1888                 }
1889         n2l3(p, resplen);
1890         if (resplen + 4 != (unsigned long)n)
1891                 {
1892                 al = SSL_AD_DECODE_ERROR;
1893                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_LENGTH_MISMATCH);
1894                 goto f_err;
1895                 }
1896         if (s->tlsext_ocsp_resp)
1897                 OPENSSL_free(s->tlsext_ocsp_resp);
1898         s->tlsext_ocsp_resp = BUF_memdup(p, resplen);
1899         if (!s->tlsext_ocsp_resp)
1900                 {
1901                 al = SSL_AD_INTERNAL_ERROR;
1902                 SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1903                 goto f_err;
1904                 }
1905         s->tlsext_ocsp_resplen = resplen;
1906         if (s->ctx->tlsext_status_cb)
1907                 {
1908                 int ret;
1909                 ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
1910                 if (ret == 0)
1911                         {
1912                         al = SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE;
1913                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,SSL_R_INVALID_STATUS_RESPONSE);
1914                         goto f_err;
1915                         }
1916                 if (ret < 0)
1917                         {
1918                         al = SSL_AD_INTERNAL_ERROR;
1919                         SSLerr(SSL_F_SSL3_GET_CERT_STATUS,ERR_R_MALLOC_FAILURE);
1920                         goto f_err;
1921                         }
1922                 }
1923         return 1;
1924 f_err:
1925         ssl3_send_alert(s,SSL3_AL_FATAL,al);
1926         return(-1);
1927         }
1928 #endif
1929
1930 int ssl3_get_server_done(SSL *s)
1931         {
1932         int ok,ret=0;
1933         long n;
1934
1935         n=s->method->ssl_get_message(s,
1936                 SSL3_ST_CR_SRVR_DONE_A,
1937                 SSL3_ST_CR_SRVR_DONE_B,
1938                 SSL3_MT_SERVER_DONE,
1939                 30, /* should be very small, like 0 :-) */
1940                 &ok);
1941
1942         if (!ok) return((int)n);
1943         if (n > 0)
1944                 {
1945                 /* should contain no data */
1946                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_DECODE_ERROR);
1947                 SSLerr(SSL_F_SSL3_GET_SERVER_DONE,SSL_R_LENGTH_MISMATCH);
1948                 return -1;
1949                 }
1950         ret=1;
1951         return(ret);
1952         }
1953
1954
1955 int ssl3_send_client_key_exchange(SSL *s)
1956         {
1957         unsigned char *p,*d;
1958         int n;
1959         unsigned long l;
1960 #ifndef OPENSSL_NO_RSA
1961         unsigned char *q;
1962         EVP_PKEY *pkey=NULL;
1963 #endif
1964 #ifndef OPENSSL_NO_KRB5
1965         KSSL_ERR kssl_err;
1966 #endif /* OPENSSL_NO_KRB5 */
1967 #ifndef OPENSSL_NO_ECDH
1968         EC_KEY *clnt_ecdh = NULL;
1969         const EC_POINT *srvr_ecpoint = NULL;
1970         EVP_PKEY *srvr_pub_pkey = NULL;
1971         unsigned char *encodedPoint = NULL;
1972         int encoded_pt_len = 0;
1973         BN_CTX * bn_ctx = NULL;
1974 #endif
1975
1976         if (s->state == SSL3_ST_CW_KEY_EXCH_A)
1977                 {
1978                 d=(unsigned char *)s->init_buf->data;
1979                 p= &(d[4]);
1980
1981                 l=s->s3->tmp.new_cipher->algorithms;
1982
1983                 /* Fool emacs indentation */
1984                 if (0) {}
1985 #ifndef OPENSSL_NO_RSA
1986                 else if (l & SSL_kRSA)
1987                         {
1988                         RSA *rsa;
1989                         unsigned char tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
1990
1991                         if (s->session->sess_cert == NULL)
1992                                 {
1993                                 /* We should always have a server certificate with SSL_kRSA. */
1994                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
1995                                 goto err;
1996                                 }
1997
1998                         if (s->session->sess_cert->peer_rsa_tmp != NULL)
1999                                 rsa=s->session->sess_cert->peer_rsa_tmp;
2000                         else
2001                                 {
2002                                 pkey=X509_get_pubkey(s->session->sess_cert->peer_pkeys[SSL_PKEY_RSA_ENC].x509);
2003                                 if ((pkey == NULL) ||
2004                                         (pkey->type != EVP_PKEY_RSA) ||
2005                                         (pkey->pkey.rsa == NULL))
2006                                         {
2007                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_INTERNAL_ERROR);
2008                                         goto err;
2009                                         }
2010                                 rsa=pkey->pkey.rsa;
2011                                 EVP_PKEY_free(pkey);
2012                                 }
2013
2014                         tmp_buf[0]=s->client_version>>8;
2015                         tmp_buf[1]=s->client_version&0xff;
2016                         if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2017                                         goto err;
2018
2019                         s->session->master_key_length=sizeof tmp_buf;
2020
2021                         q=p;
2022                         /* Fix buf for TLS and beyond */
2023                         if (s->version > SSL3_VERSION)
2024                                 p+=2;
2025                         n=RSA_public_encrypt(sizeof tmp_buf,
2026                                 tmp_buf,p,rsa,RSA_PKCS1_PADDING);
2027 #ifdef PKCS1_CHECK
2028                         if (s->options & SSL_OP_PKCS1_CHECK_1) p[1]++;
2029                         if (s->options & SSL_OP_PKCS1_CHECK_2) tmp_buf[0]=0x70;
2030 #endif
2031                         if (n <= 0)
2032                                 {
2033                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_BAD_RSA_ENCRYPT);
2034                                 goto err;
2035                                 }
2036
2037                         /* Fix buf for TLS and beyond */
2038                         if (s->version > SSL3_VERSION)
2039                                 {
2040                                 s2n(n,q);
2041                                 n+=2;
2042                                 }
2043
2044                         s->session->master_key_length=
2045                                 s->method->ssl3_enc->generate_master_secret(s,
2046                                         s->session->master_key,
2047                                         tmp_buf,sizeof tmp_buf);
2048                         OPENSSL_cleanse(tmp_buf,sizeof tmp_buf);
2049                         }
2050 #endif
2051 #ifndef OPENSSL_NO_KRB5
2052                 else if (l & SSL_kKRB5)
2053                         {
2054                         krb5_error_code krb5rc;
2055                         KSSL_CTX        *kssl_ctx = s->kssl_ctx;
2056                         /*  krb5_data   krb5_ap_req;  */
2057                         krb5_data       *enc_ticket;
2058                         krb5_data       authenticator, *authp = NULL;
2059                         EVP_CIPHER_CTX  ciph_ctx;
2060                         EVP_CIPHER      *enc = NULL;
2061                         unsigned char   iv[EVP_MAX_IV_LENGTH];
2062                         unsigned char   tmp_buf[SSL_MAX_MASTER_KEY_LENGTH];
2063                         unsigned char   epms[SSL_MAX_MASTER_KEY_LENGTH
2064                                                 + EVP_MAX_IV_LENGTH];
2065                         int             padl, outl = sizeof(epms);
2066
2067                         EVP_CIPHER_CTX_init(&ciph_ctx);
2068
2069 #ifdef KSSL_DEBUG
2070                         printf("ssl3_send_client_key_exchange(%lx & %lx)\n",
2071                                 l, SSL_kKRB5);
2072 #endif  /* KSSL_DEBUG */
2073
2074                         authp = NULL;
2075 #ifdef KRB5SENDAUTH
2076                         if (KRB5SENDAUTH)  authp = &authenticator;
2077 #endif  /* KRB5SENDAUTH */
2078
2079                         krb5rc = kssl_cget_tkt(kssl_ctx, &enc_ticket, authp,
2080                                 &kssl_err);
2081                         enc = kssl_map_enc(kssl_ctx->enctype);
2082                         if (enc == NULL)
2083                             goto err;
2084 #ifdef KSSL_DEBUG
2085                         {
2086                         printf("kssl_cget_tkt rtn %d\n", krb5rc);
2087                         if (krb5rc && kssl_err.text)
2088                           printf("kssl_cget_tkt kssl_err=%s\n", kssl_err.text);
2089                         }
2090 #endif  /* KSSL_DEBUG */
2091
2092                         if (krb5rc)
2093                                 {
2094                                 ssl3_send_alert(s,SSL3_AL_FATAL,
2095                                                 SSL_AD_HANDSHAKE_FAILURE);
2096                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2097                                                 kssl_err.reason);
2098                                 goto err;
2099                                 }
2100
2101                         /*  20010406 VRS - Earlier versions used KRB5 AP_REQ
2102                         **  in place of RFC 2712 KerberosWrapper, as in:
2103                         **
2104                         **  Send ticket (copy to *p, set n = length)
2105                         **  n = krb5_ap_req.length;
2106                         **  memcpy(p, krb5_ap_req.data, krb5_ap_req.length);
2107                         **  if (krb5_ap_req.data)
2108                         **    kssl_krb5_free_data_contents(NULL,&krb5_ap_req);
2109                         **
2110                         **  Now using real RFC 2712 KerberosWrapper
2111                         **  (Thanks to Simon Wilkinson <sxw@sxw.org.uk>)
2112                         **  Note: 2712 "opaque" types are here replaced
2113                         **  with a 2-byte length followed by the value.
2114                         **  Example:
2115                         **  KerberosWrapper= xx xx asn1ticket 0 0 xx xx encpms
2116                         **  Where "xx xx" = length bytes.  Shown here with
2117                         **  optional authenticator omitted.
2118                         */
2119
2120                         /*  KerberosWrapper.Ticket              */
2121                         s2n(enc_ticket->length,p);
2122                         memcpy(p, enc_ticket->data, enc_ticket->length);
2123                         p+= enc_ticket->length;
2124                         n = enc_ticket->length + 2;
2125
2126                         /*  KerberosWrapper.Authenticator       */
2127                         if (authp  &&  authp->length)
2128                                 {
2129                                 s2n(authp->length,p);
2130                                 memcpy(p, authp->data, authp->length);
2131                                 p+= authp->length;
2132                                 n+= authp->length + 2;
2133
2134                                 free(authp->data);
2135                                 authp->data = NULL;
2136                                 authp->length = 0;
2137                                 }
2138                         else
2139                                 {
2140                                 s2n(0,p);/*  null authenticator length  */
2141                                 n+=2;
2142                                 }
2143
2144                             tmp_buf[0]=s->client_version>>8;
2145                             tmp_buf[1]=s->client_version&0xff;
2146                             if (RAND_bytes(&(tmp_buf[2]),sizeof tmp_buf-2) <= 0)
2147                                 goto err;
2148
2149                         /*  20010420 VRS.  Tried it this way; failed.
2150                         **      EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,NULL);
2151                         **      EVP_CIPHER_CTX_set_key_length(&ciph_ctx,
2152                         **                              kssl_ctx->length);
2153                         **      EVP_EncryptInit_ex(&ciph_ctx,NULL, key,iv);
2154                         */
2155
2156                         memset(iv, 0, sizeof iv);  /* per RFC 1510 */
2157                         EVP_EncryptInit_ex(&ciph_ctx,enc, NULL,
2158                                 kssl_ctx->key,iv);
2159                         EVP_EncryptUpdate(&ciph_ctx,epms,&outl,tmp_buf,
2160                                 sizeof tmp_buf);
2161                         EVP_EncryptFinal_ex(&ciph_ctx,&(epms[outl]),&padl);
2162                         outl += padl;
2163                         if (outl > sizeof epms)
2164                                 {
2165                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
2166                                 goto err;
2167                                 }
2168                         EVP_CIPHER_CTX_cleanup(&ciph_ctx);
2169
2170                         /*  KerberosWrapper.EncryptedPreMasterSecret    */
2171                         s2n(outl,p);
2172                         memcpy(p, epms, outl);
2173                         p+=outl;
2174                         n+=outl + 2;
2175
2176                         s->session->master_key_length=
2177                                 s->method->ssl3_enc->generate_master_secret(s,
2178                                         s->session->master_key,
2179                                         tmp_buf, sizeof tmp_buf);
2180
2181                         OPENSSL_cleanse(tmp_buf, sizeof tmp_buf);
2182                         OPENSSL_cleanse(epms, outl);
2183                         }
2184 #endif
2185 #ifndef OPENSSL_NO_DH
2186                 else if (l & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2187                         {
2188                         DH *dh_srvr,*dh_clnt;
2189
2190                         if (s->session->sess_cert == NULL)
2191                                 {
2192                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2193                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2194                                 goto err;
2195                                 }
2196
2197                         if (s->session->sess_cert->peer_dh_tmp != NULL)
2198                                 dh_srvr=s->session->sess_cert->peer_dh_tmp;
2199                         else
2200                                 {
2201                                 /* we get them from the cert */
2202                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2203                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNABLE_TO_FIND_DH_PARAMETERS);
2204                                 goto err;
2205                                 }
2206
2207                         /* generate a new random key */
2208                         if ((dh_clnt=DHparams_dup(dh_srvr)) == NULL)
2209                                 {
2210                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2211                                 goto err;
2212                                 }
2213                         if (!DH_generate_key(dh_clnt))
2214                                 {
2215                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2216                                 goto err;
2217                                 }
2218
2219                         /* use the 'p' output buffer for the DH key, but
2220                          * make sure to clear it out afterwards */
2221
2222                         n=DH_compute_key(p,dh_srvr->pub_key,dh_clnt);
2223
2224                         if (n <= 0)
2225                                 {
2226                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_DH_LIB);
2227                                 goto err;
2228                                 }
2229
2230                         /* generate master key from the result */
2231                         s->session->master_key_length=
2232                                 s->method->ssl3_enc->generate_master_secret(s,
2233                                         s->session->master_key,p,n);
2234                         /* clean up */
2235                         memset(p,0,n);
2236
2237                         /* send off the data */
2238                         n=BN_num_bytes(dh_clnt->pub_key);
2239                         s2n(n,p);
2240                         BN_bn2bin(dh_clnt->pub_key,p);
2241                         n+=2;
2242
2243                         DH_free(dh_clnt);
2244
2245                         /* perhaps clean things up a bit EAY EAY EAY EAY*/
2246                         }
2247 #endif
2248
2249 #ifndef OPENSSL_NO_ECDH
2250                 else if ((l & SSL_kECDH) || (l & SSL_kECDHE))
2251                         {
2252                         const EC_GROUP *srvr_group = NULL;
2253                         EC_KEY *tkey;
2254                         int ecdh_clnt_cert = 0;
2255                         int field_size = 0;
2256
2257                         if (s->session->sess_cert == NULL)
2258                                 {
2259                                 ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_UNEXPECTED_MESSAGE);
2260                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,SSL_R_UNEXPECTED_MESSAGE);
2261                                 goto err;
2262                                 }
2263
2264                         /* Did we send out the client's
2265                          * ECDH share for use in premaster
2266                          * computation as part of client certificate?
2267                          * If so, set ecdh_clnt_cert to 1.
2268                          */
2269                         if ((l & SSL_kECDH) && (s->cert != NULL))
2270                                 {
2271                                 /* XXX: For now, we do not support client
2272                                  * authentication using ECDH certificates.
2273                                  * To add such support, one needs to add
2274                                  * code that checks for appropriate
2275                                  * conditions and sets ecdh_clnt_cert to 1.
2276                                  * For example, the cert have an ECC
2277                                  * key on the same curve as the server's
2278                                  * and the key should be authorized for
2279                                  * key agreement.
2280                                  *
2281                                  * One also needs to add code in ssl3_connect
2282                                  * to skip sending the certificate verify
2283                                  * message.
2284                                  *
2285                                  * if ((s->cert->key->privatekey != NULL) &&
2286                                  *     (s->cert->key->privatekey->type ==
2287                                  *      EVP_PKEY_EC) && ...)
2288                                  * ecdh_clnt_cert = 1;
2289                                  */
2290                                 }
2291
2292                         if (s->session->sess_cert->peer_ecdh_tmp != NULL)
2293                                 {
2294                                 tkey = s->session->sess_cert->peer_ecdh_tmp;
2295                                 }
2296                         else
2297                                 {
2298                                 /* Get the Server Public Key from Cert */
2299                                 srvr_pub_pkey = X509_get_pubkey(s->session-> \
2300                                     sess_cert->peer_pkeys[SSL_PKEY_ECC].x509);
2301                                 if ((srvr_pub_pkey == NULL) ||
2302                                     (srvr_pub_pkey->type != EVP_PKEY_EC) ||
2303                                     (srvr_pub_pkey->pkey.ec == NULL))
2304                                         {
2305                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2306                                             ERR_R_INTERNAL_ERROR);
2307                                         goto err;
2308                                         }
2309
2310                                 tkey = srvr_pub_pkey->pkey.ec;
2311                                 }
2312
2313                         srvr_group   = EC_KEY_get0_group(tkey);
2314                         srvr_ecpoint = EC_KEY_get0_public_key(tkey);
2315
2316                         if ((srvr_group == NULL) || (srvr_ecpoint == NULL))
2317                                 {
2318                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2319                                     ERR_R_INTERNAL_ERROR);
2320                                 goto err;
2321                                 }
2322
2323                         if ((clnt_ecdh=EC_KEY_new()) == NULL)
2324                                 {
2325                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2326                                 goto err;
2327                                 }
2328
2329                         if (!EC_KEY_set_group(clnt_ecdh, srvr_group))
2330                                 {
2331                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2332                                 goto err;
2333                                 }
2334                         if (ecdh_clnt_cert)
2335                                 {
2336                                 /* Reuse key info from our certificate
2337                                  * We only need our private key to perform
2338                                  * the ECDH computation.
2339                                  */
2340                                 const BIGNUM *priv_key;
2341                                 tkey = s->cert->key->privatekey->pkey.ec;
2342                                 priv_key = EC_KEY_get0_private_key(tkey);
2343                                 if (priv_key == NULL)
2344                                         {
2345                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2346                                         goto err;
2347                                         }
2348                                 if (!EC_KEY_set_private_key(clnt_ecdh, priv_key))
2349                                         {
2350                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_EC_LIB);
2351                                         goto err;
2352                                         }
2353                                 }
2354                         else
2355                                 {
2356                                 /* Generate a new ECDH key pair */
2357                                 if (!(EC_KEY_generate_key(clnt_ecdh)))
2358                                         {
2359                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE, ERR_R_ECDH_LIB);
2360                                         goto err;
2361                                         }
2362                                 }
2363
2364                         /* use the 'p' output buffer for the ECDH key, but
2365                          * make sure to clear it out afterwards
2366                          */
2367
2368                         field_size = EC_GROUP_get_degree(srvr_group);
2369                         if (field_size <= 0)
2370                                 {
2371                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2372                                        ERR_R_ECDH_LIB);
2373                                 goto err;
2374                                 }
2375                         n=ECDH_compute_key(p, (field_size+7)/8, srvr_ecpoint, clnt_ecdh, NULL);
2376                         if (n <= 0)
2377                                 {
2378                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2379                                        ERR_R_ECDH_LIB);
2380                                 goto err;
2381                                 }
2382
2383                         /* generate master key from the result */
2384                         s->session->master_key_length = s->method->ssl3_enc \
2385                             -> generate_master_secret(s,
2386                                 s->session->master_key,
2387                                 p, n);
2388
2389                         memset(p, 0, n); /* clean up */
2390
2391                         if (ecdh_clnt_cert)
2392                                 {
2393                                 /* Send empty client key exch message */
2394                                 n = 0;
2395                                 }
2396                         else
2397                                 {
2398                                 /* First check the size of encoding and
2399                                  * allocate memory accordingly.
2400                                  */
2401                                 encoded_pt_len =
2402                                     EC_POINT_point2oct(srvr_group,
2403                                         EC_KEY_get0_public_key(clnt_ecdh),
2404                                         POINT_CONVERSION_UNCOMPRESSED,
2405                                         NULL, 0, NULL);
2406
2407                                 encodedPoint = (unsigned char *)
2408                                     OPENSSL_malloc(encoded_pt_len *
2409                                         sizeof(unsigned char));
2410                                 bn_ctx = BN_CTX_new();
2411                                 if ((encodedPoint == NULL) ||
2412                                     (bn_ctx == NULL))
2413                                         {
2414                                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,ERR_R_MALLOC_FAILURE);
2415                                         goto err;
2416                                         }
2417
2418                                 /* Encode the public key */
2419                                 n = EC_POINT_point2oct(srvr_group,
2420                                     EC_KEY_get0_public_key(clnt_ecdh),
2421                                     POINT_CONVERSION_UNCOMPRESSED,
2422                                     encodedPoint, encoded_pt_len, bn_ctx);
2423
2424                                 *p = n; /* length of encoded point */
2425                                 /* Encoded point will be copied here */
2426                                 p += 1;
2427                                 /* copy the point */
2428                                 memcpy((unsigned char *)p, encodedPoint, n);
2429                                 /* increment n to account for length field */
2430                                 n += 1;
2431                                 }
2432
2433                         /* Free allocated memory */
2434                         BN_CTX_free(bn_ctx);
2435                         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2436                         if (clnt_ecdh != NULL)
2437                                  EC_KEY_free(clnt_ecdh);
2438                         EVP_PKEY_free(srvr_pub_pkey);
2439                         }
2440 #endif /* !OPENSSL_NO_ECDH */
2441                 else
2442                         {
2443                         ssl3_send_alert(s, SSL3_AL_FATAL,
2444                             SSL_AD_HANDSHAKE_FAILURE);
2445                         SSLerr(SSL_F_SSL3_SEND_CLIENT_KEY_EXCHANGE,
2446                             ERR_R_INTERNAL_ERROR);
2447                         goto err;
2448                         }
2449
2450                 *(d++)=SSL3_MT_CLIENT_KEY_EXCHANGE;
2451                 l2n3(n,d);
2452
2453                 s->state=SSL3_ST_CW_KEY_EXCH_B;
2454                 /* number of bytes to write */
2455                 s->init_num=n+4;
2456                 s->init_off=0;
2457                 }
2458
2459         /* SSL3_ST_CW_KEY_EXCH_B */
2460         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2461 err:
2462 #ifndef OPENSSL_NO_ECDH
2463         BN_CTX_free(bn_ctx);
2464         if (encodedPoint != NULL) OPENSSL_free(encodedPoint);
2465         if (clnt_ecdh != NULL)
2466                 EC_KEY_free(clnt_ecdh);
2467         EVP_PKEY_free(srvr_pub_pkey);
2468 #endif
2469         return(-1);
2470         }
2471
2472 int ssl3_send_client_verify(SSL *s)
2473         {
2474         unsigned char *p,*d;
2475         unsigned char data[MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH];
2476         EVP_PKEY *pkey;
2477 #ifndef OPENSSL_NO_RSA
2478         unsigned u=0;
2479 #endif
2480         unsigned long n;
2481 #if !defined(OPENSSL_NO_DSA) || !defined(OPENSSL_NO_ECDSA)
2482         int j;
2483 #endif
2484
2485         if (s->state == SSL3_ST_CW_CERT_VRFY_A)
2486                 {
2487                 d=(unsigned char *)s->init_buf->data;
2488                 p= &(d[4]);
2489                 pkey=s->cert->key->privatekey;
2490
2491                 s->method->ssl3_enc->cert_verify_mac(s,&(s->s3->finish_dgst2),
2492                         &(data[MD5_DIGEST_LENGTH]));
2493
2494 #ifndef OPENSSL_NO_RSA
2495                 if (pkey->type == EVP_PKEY_RSA)
2496                         {
2497                         s->method->ssl3_enc->cert_verify_mac(s,
2498                                 &(s->s3->finish_dgst1),&(data[0]));
2499                         if (RSA_sign(NID_md5_sha1, data,
2500                                          MD5_DIGEST_LENGTH+SHA_DIGEST_LENGTH,
2501                                         &(p[2]), &u, pkey->pkey.rsa) <= 0 )
2502                                 {
2503                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_RSA_LIB);
2504                                 goto err;
2505                                 }
2506                         s2n(u,p);
2507                         n=u+2;
2508                         }
2509                 else
2510 #endif
2511 #ifndef OPENSSL_NO_DSA
2512                         if (pkey->type == EVP_PKEY_DSA)
2513                         {
2514                         if (!DSA_sign(pkey->save_type,
2515                                 &(data[MD5_DIGEST_LENGTH]),
2516                                 SHA_DIGEST_LENGTH,&(p[2]),
2517                                 (unsigned int *)&j,pkey->pkey.dsa))
2518                                 {
2519                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_DSA_LIB);
2520                                 goto err;
2521                                 }
2522                         s2n(j,p);
2523                         n=j+2;
2524                         }
2525                 else
2526 #endif
2527 #ifndef OPENSSL_NO_ECDSA
2528                         if (pkey->type == EVP_PKEY_EC)
2529                         {
2530                         if (!ECDSA_sign(pkey->save_type,
2531                                 &(data[MD5_DIGEST_LENGTH]),
2532                                 SHA_DIGEST_LENGTH,&(p[2]),
2533                                 (unsigned int *)&j,pkey->pkey.ec))
2534                                 {
2535                                 SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,
2536                                     ERR_R_ECDSA_LIB);
2537                                 goto err;
2538                                 }
2539                         s2n(j,p);
2540                         n=j+2;
2541                         }
2542                 else
2543 #endif
2544                         {
2545                         SSLerr(SSL_F_SSL3_SEND_CLIENT_VERIFY,ERR_R_INTERNAL_ERROR);
2546                         goto err;
2547                         }
2548                 *(d++)=SSL3_MT_CERTIFICATE_VERIFY;
2549                 l2n3(n,d);
2550
2551                 s->state=SSL3_ST_CW_CERT_VRFY_B;
2552                 s->init_num=(int)n+4;
2553                 s->init_off=0;
2554                 }
2555         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2556 err:
2557         return(-1);
2558         }
2559
2560 int ssl3_send_client_certificate(SSL *s)
2561         {
2562         X509 *x509=NULL;
2563         EVP_PKEY *pkey=NULL;
2564         int i;
2565         unsigned long l;
2566
2567         if (s->state == SSL3_ST_CW_CERT_A)
2568                 {
2569                 if ((s->cert == NULL) ||
2570                         (s->cert->key->x509 == NULL) ||
2571                         (s->cert->key->privatekey == NULL))
2572                         s->state=SSL3_ST_CW_CERT_B;
2573                 else
2574                         s->state=SSL3_ST_CW_CERT_C;
2575                 }
2576
2577         /* We need to get a client cert */
2578         if (s->state == SSL3_ST_CW_CERT_B)
2579                 {
2580                 /* If we get an error, we need to
2581                  * ssl->rwstate=SSL_X509_LOOKUP; return(-1);
2582                  * We then get retied later */
2583                 i=0;
2584                 i = ssl_do_client_cert_cb(s, &x509, &pkey);
2585                 if (i < 0)
2586                         {
2587                         s->rwstate=SSL_X509_LOOKUP;
2588                         return(-1);
2589                         }
2590                 s->rwstate=SSL_NOTHING;
2591                 if ((i == 1) && (pkey != NULL) && (x509 != NULL))
2592                         {
2593                         s->state=SSL3_ST_CW_CERT_B;
2594                         if (    !SSL_use_certificate(s,x509) ||
2595                                 !SSL_use_PrivateKey(s,pkey))
2596                                 i=0;
2597                         }
2598                 else if (i == 1)
2599                         {
2600                         i=0;
2601                         SSLerr(SSL_F_SSL3_SEND_CLIENT_CERTIFICATE,SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
2602                         }
2603
2604                 if (x509 != NULL) X509_free(x509);
2605                 if (pkey != NULL) EVP_PKEY_free(pkey);
2606                 if (i == 0)
2607                         {
2608                         if (s->version == SSL3_VERSION)
2609                                 {
2610                                 s->s3->tmp.cert_req=0;
2611                                 ssl3_send_alert(s,SSL3_AL_WARNING,SSL_AD_NO_CERTIFICATE);
2612                                 return(1);
2613                                 }
2614                         else
2615                                 {
2616                                 s->s3->tmp.cert_req=2;
2617                                 }
2618                         }
2619
2620                 /* Ok, we have a cert */
2621                 s->state=SSL3_ST_CW_CERT_C;
2622                 }
2623
2624         if (s->state == SSL3_ST_CW_CERT_C)
2625                 {
2626                 s->state=SSL3_ST_CW_CERT_D;
2627                 l=ssl3_output_cert_chain(s,
2628                         (s->s3->tmp.cert_req == 2)?NULL:s->cert->key->x509);
2629                 s->init_num=(int)l;
2630                 s->init_off=0;
2631                 }
2632         /* SSL3_ST_CW_CERT_D */
2633         return(ssl3_do_write(s,SSL3_RT_HANDSHAKE));
2634         }
2635
2636 #define has_bits(i,m)   (((i)&(m)) == (m))
2637
2638 int ssl3_check_cert_and_algorithm(SSL *s)
2639         {
2640         int i,idx;
2641         long algs;
2642         EVP_PKEY *pkey=NULL;
2643         SESS_CERT *sc;
2644 #ifndef OPENSSL_NO_RSA
2645         RSA *rsa;
2646 #endif
2647 #ifndef OPENSSL_NO_DH
2648         DH *dh;
2649 #endif
2650
2651         sc=s->session->sess_cert;
2652
2653         algs=s->s3->tmp.new_cipher->algorithms;
2654
2655         /* we don't have a certificate */
2656         if (algs & (SSL_aDH|SSL_aNULL|SSL_aKRB5))
2657                 return(1);
2658
2659         if (sc == NULL)
2660                 {
2661                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,ERR_R_INTERNAL_ERROR);
2662                 goto err;
2663                 }
2664
2665 #ifndef OPENSSL_NO_RSA
2666         rsa=s->session->sess_cert->peer_rsa_tmp;
2667 #endif
2668 #ifndef OPENSSL_NO_DH
2669         dh=s->session->sess_cert->peer_dh_tmp;
2670 #endif
2671
2672         /* This is the passed certificate */
2673
2674         idx=sc->peer_cert_type;
2675 #ifndef OPENSSL_NO_ECDH
2676         if (idx == SSL_PKEY_ECC)
2677                 {
2678                 if (check_srvr_ecc_cert_and_alg(sc->peer_pkeys[idx].x509,
2679                     s->s3->tmp.new_cipher) == 0)
2680                         { /* check failed */
2681                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_BAD_ECC_CERT);
2682                         goto f_err;
2683                         }
2684                 else
2685                         {
2686                         return 1;
2687                         }
2688                 }
2689 #endif
2690         pkey=X509_get_pubkey(sc->peer_pkeys[idx].x509);
2691         i=X509_certificate_type(sc->peer_pkeys[idx].x509,pkey);
2692         EVP_PKEY_free(pkey);
2693
2694
2695         /* Check that we have a certificate if we require one */
2696         if ((algs & SSL_aRSA) && !has_bits(i,EVP_PK_RSA|EVP_PKT_SIGN))
2697                 {
2698                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_SIGNING_CERT);
2699                 goto f_err;
2700                 }
2701 #ifndef OPENSSL_NO_DSA
2702         else if ((algs & SSL_aDSS) && !has_bits(i,EVP_PK_DSA|EVP_PKT_SIGN))
2703                 {
2704                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DSA_SIGNING_CERT);
2705                 goto f_err;
2706                 }
2707 #endif
2708 #ifndef OPENSSL_NO_RSA
2709         if ((algs & SSL_kRSA) &&
2710                 !(has_bits(i,EVP_PK_RSA|EVP_PKT_ENC) || (rsa != NULL)))
2711                 {
2712                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_RSA_ENCRYPTING_CERT);
2713                 goto f_err;
2714                 }
2715 #endif
2716 #ifndef OPENSSL_NO_DH
2717         if ((algs & SSL_kEDH) &&
2718                 !(has_bits(i,EVP_PK_DH|EVP_PKT_EXCH) || (dh != NULL)))
2719                 {
2720                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_KEY);
2721                 goto f_err;
2722                 }
2723         else if ((algs & SSL_kDHr) && !has_bits(i,EVP_PK_DH|EVP_PKS_RSA))
2724                 {
2725                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_RSA_CERT);
2726                 goto f_err;
2727                 }
2728 #ifndef OPENSSL_NO_DSA
2729         else if ((algs & SSL_kDHd) && !has_bits(i,EVP_PK_DH|EVP_PKS_DSA))
2730                 {
2731                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_DH_DSA_CERT);
2732                 goto f_err;
2733                 }
2734 #endif
2735 #endif
2736
2737         if (SSL_C_IS_EXPORT(s->s3->tmp.new_cipher) && !has_bits(i,EVP_PKT_EXP))
2738                 {
2739 #ifndef OPENSSL_NO_RSA
2740                 if (algs & SSL_kRSA)
2741                         {
2742                         if (rsa == NULL
2743                             || RSA_size(rsa)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2744                                 {
2745                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_RSA_KEY);
2746                                 goto f_err;
2747                                 }
2748                         }
2749                 else
2750 #endif
2751 #ifndef OPENSSL_NO_DH
2752                         if (algs & (SSL_kEDH|SSL_kDHr|SSL_kDHd))
2753                             {
2754                             if (dh == NULL
2755                                 || DH_size(dh)*8 > SSL_C_EXPORT_PKEYLENGTH(s->s3->tmp.new_cipher))
2756                                 {
2757                                 SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_MISSING_EXPORT_TMP_DH_KEY);
2758                                 goto f_err;
2759                                 }
2760                         }
2761                 else
2762 #endif
2763                         {
2764                         SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
2765                         goto f_err;
2766                         }
2767                 }
2768         return(1);
2769 f_err:
2770         ssl3_send_alert(s,SSL3_AL_FATAL,SSL_AD_HANDSHAKE_FAILURE);
2771 err:
2772         return(0);
2773         }
2774
2775
2776 #ifndef OPENSSL_NO_ECDH
2777 /* This is the complement of nid2curve_id in s3_srvr.c. */
2778 static int curve_id2nid(int curve_id)
2779 {
2780         /* ECC curves from draft-ietf-tls-ecc-01.txt (Mar 15, 2001)
2781          * (no changes in draft-ietf-tls-ecc-03.txt [June 2003]) */
2782         static int nid_list[26] =
2783         {
2784                 0,
2785                 NID_sect163k1, /* sect163k1 (1) */
2786                 NID_sect163r1, /* sect163r1 (2) */
2787                 NID_sect163r2, /* sect163r2 (3) */
2788                 NID_sect193r1, /* sect193r1 (4) */
2789                 NID_sect193r2, /* sect193r2 (5) */
2790                 NID_sect233k1, /* sect233k1 (6) */
2791                 NID_sect233r1, /* sect233r1 (7) */
2792                 NID_sect239k1, /* sect239k1 (8) */
2793                 NID_sect283k1, /* sect283k1 (9) */
2794                 NID_sect283r1, /* sect283r1 (10) */
2795                 NID_sect409k1, /* sect409k1 (11) */
2796                 NID_sect409r1, /* sect409r1 (12) */
2797                 NID_sect571k1, /* sect571k1 (13) */
2798                 NID_sect571r1, /* sect571r1 (14) */
2799                 NID_secp160k1, /* secp160k1 (15) */
2800                 NID_secp160r1, /* secp160r1 (16) */
2801                 NID_secp160r2, /* secp160r2 (17) */
2802                 NID_secp192k1, /* secp192k1 (18) */
2803                 NID_X9_62_prime192v1, /* secp192r1 (19) */
2804                 NID_secp224k1, /* secp224k1 (20) */
2805                 NID_secp224r1, /* secp224r1 (21) */
2806                 NID_secp256k1, /* secp256k1 (22) */
2807                 NID_X9_62_prime256v1, /* secp256r1 (23) */
2808                 NID_secp384r1, /* secp384r1 (24) */
2809                 NID_secp521r1  /* secp521r1 (25) */
2810         };
2811
2812         if ((curve_id < 1) || (curve_id > 25)) return 0;
2813
2814         return nid_list[curve_id];
2815 }
2816 #endif
2817
2818 /* Check to see if handshake is full or resumed. Usually this is just a
2819  * case of checking to see if a cache hit has occurred. In the case of
2820  * session tickets we have to check the next message to be sure.
2821  */
2822
2823 #ifndef OPENSSL_NO_TLSEXT
2824 int ssl3_check_finished(SSL *s)
2825         {
2826         int ok;
2827         long n;
2828         /* If we have no ticket or session ID is non-zero length (a match of
2829          * a non-zero session length would never reach here) it cannot be a
2830          * resumed session.
2831          */
2832         if (!s->session->tlsext_tick || s->session->session_id_length)
2833                 return 1;
2834         /* this function is called when we really expect a Certificate
2835          * message, so permit appropriate message length */
2836         n=s->method->ssl_get_message(s,
2837                 SSL3_ST_CR_CERT_A,
2838                 SSL3_ST_CR_CERT_B,
2839                 -1,
2840                 s->max_cert_list,
2841                 &ok);
2842         if (!ok) return((int)n);
2843         s->s3->tmp.reuse_message = 1;
2844         if ((s->s3->tmp.message_type == SSL3_MT_FINISHED)
2845                 || (s->s3->tmp.message_type == SSL3_MT_NEWSESSION_TICKET))
2846                 return 2;
2847
2848         return 1;
2849         }
2850 #endif
2851
2852 int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
2853         {
2854         int i = 0;
2855 #ifndef OPENSSL_NO_ENGINE
2856         if (s->ctx->client_cert_engine)
2857                 {
2858                 i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
2859                                                 SSL_get_client_CA_list(s),
2860                                                 px509, ppkey, NULL, NULL, NULL);
2861                 if (i != 0)
2862                         return i;
2863                 }
2864 #endif
2865         if (s->ctx->client_cert_cb)
2866                 i = s->ctx->client_cert_cb(s,px509,ppkey);
2867         return i;
2868         }